From 57e7092dfa8dcc18c79964da27f22621fdf0a321 Mon Sep 17 00:00:00 2001 From: nlohmann Date: Sun, 29 Jun 2025 20:03:31 +0000 Subject: [PATCH] deploy: b7f741165b224fb798c3702e1975a005c2d8f489 --- 404.html | 2 +- api/adl_serializer/from_json/index.html | 4 +- api/adl_serializer/index.html | 4 +- api/adl_serializer/to_json/index.html | 4 +- api/basic_json/accept/index.html | 4 +- api/basic_json/array/index.html | 4 +- api/basic_json/array_t/index.html | 4 +- api/basic_json/at/index.html | 4 +- api/basic_json/back/index.html | 4 +- api/basic_json/basic_json/index.html | 4 +- api/basic_json/begin/index.html | 4 +- api/basic_json/binary/index.html | 4 +- api/basic_json/binary_t/index.html | 4 +- api/basic_json/boolean_t/index.html | 4 +- api/basic_json/cbegin/index.html | 4 +- api/basic_json/cbor_tag_handler_t/index.html | 4 +- api/basic_json/cend/index.html | 4 +- api/basic_json/clear/index.html | 4 +- api/basic_json/contains/index.html | 4 +- api/basic_json/count/index.html | 4 +- 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404 - Not found

Copyright © 2013-2025 Niels Lohmann
\ No newline at end of file + JSON for Modern C++

404 - Not found

Copyright © 2013-2025 Niels Lohmann
\ No newline at end of file diff --git a/api/adl_serializer/from_json/index.html b/api/adl_serializer/from_json/index.html index 5d52faf7f..04825e994 100644 --- a/api/adl_serializer/from_json/index.html +++ b/api/adl_serializer/from_json/index.html @@ -1,4 +1,4 @@ - from_json - JSON for Modern C++
Skip to content

nlohmann::adl_serializer::from_json

// (1)
+ from_json - JSON for Modern C++      
 
 
  
 
  
 
 
 
 
  
 
 
 
 
 
  
 
 
 
 
       
nlohmann::adl_serializer::from_json
 
// (1)
 template<typename BasicJsonType, typename TargetType = ValueType>
 static auto from_json(BasicJsonType && j, TargetType& val) noexcept(
     noexcept(::nlohmann::from_json(std::forward<BasicJsonType>(j), val)))
@@ -101,4 +101,4 @@
     std::cout << p.name << " (" << p.age << ") lives in " << p.address << std::endl;
 }
 
 
Output:
 
Ned Flanders (60) lives in 744 Evergreen Terrace
-
  
See also
  
Version history
 
     
  • Added in version 2.1.0.
    •  
   
 
   
  
 
 
 
 
 
 Copyright © 2013-2025 Niels Lohmann 
 
 
             
 
 
 
 
 
 
 
     
\ No newline at end of file
+

See also

Version history

  • Added in version 2.1.0.
Copyright © 2013-2025 Niels Lohmann
\ No newline at end of file diff --git a/api/adl_serializer/index.html b/api/adl_serializer/index.html index 085136dc8..b13ee0d23 100644 --- a/api/adl_serializer/index.html +++ b/api/adl_serializer/index.html @@ -1,4 +1,4 @@ - Overview - JSON for Modern C++
Skip to content

nlohmann::adl_serializer

template<typename, typename>
+ Overview - JSON for Modern C++      
 
 
  
 
  
 
 
 
 
  
 
 
 
 
 
  
 
 
 
 
       
nlohmann::adl_serializer
 
template<typename, typename>
 struct adl_serializer;
 
 
Serializer that uses ADL (Argument-Dependent Lookup) to choose to_json/from_json functions from the types' namespaces.
 
It is implemented similarly to
 
template<typename ValueType>
 struct adl_serializer {
@@ -12,4 +12,4 @@
         // same thing, but with the "from_json" method
     }
 };
-
 
Member functions
 
     
  • from_json - convert a JSON value to any value type
    •  
  • to_json - convert any value type to a JSON value
    •  
 
Version history
 
     
  • Added in version 2.1.0.
    •  
   
 
   
  
 
 
 
 
 
 Copyright © 2013-2025 Niels Lohmann 
 
 
             
 
 
 
 
 
 
 
     
\ No newline at end of file
+

Member functions

  • from_json - convert a JSON value to any value type
  • to_json - convert any value type to a JSON value

Version history

  • Added in version 2.1.0.
Copyright © 2013-2025 Niels Lohmann
\ No newline at end of file diff --git a/api/adl_serializer/to_json/index.html b/api/adl_serializer/to_json/index.html index 91ab4ade7..e903e6ca3 100644 --- a/api/adl_serializer/to_json/index.html +++ b/api/adl_serializer/to_json/index.html @@ -1,4 +1,4 @@ - to_json - JSON for Modern C++
Skip to content

nlohmann::adl_serializer::to_json

template<typename BasicJsonType, typename TargetType = ValueType>
+ to_json - JSON for Modern C++      
 
 
  
 
  
 
 
 
 
  
 
 
 
 
 
  
 
 
 
 
       
nlohmann::adl_serializer::to_json
 
template<typename BasicJsonType, typename TargetType = ValueType>
 static auto to_json(BasicJsonType& j, TargetType && val) noexcept(
     noexcept(::nlohmann::to_json(j, std::forward<TargetType>(val))))
 -> decltype(::nlohmann::to_json(j, std::forward<TargetType>(val)), void())
@@ -35,4 +35,4 @@
     std::cout << j << std::endl;
 }
 
 
Output:
 
{"address":"744 Evergreen Terrace","age":60,"name":"Ned Flanders"}
-
  
See also
  
Version history
 
     
  • Added in version 2.1.0.
    •  
   
 
   
  
 
 
 
 
 
 Copyright © 2013-2025 Niels Lohmann 
 
 
             
 
 
 
 
 
 
 
     
\ No newline at end of file
+

See also

Version history

  • Added in version 2.1.0.
Copyright © 2013-2025 Niels Lohmann
\ No newline at end of file diff --git a/api/basic_json/accept/index.html b/api/basic_json/accept/index.html index 4625977dc..8169a5e50 100644 --- a/api/basic_json/accept/index.html +++ b/api/basic_json/accept/index.html @@ -1,4 +1,4 @@ - accept - JSON for Modern C++
Skip to content

nlohmann::basic_json::accept

// (1)
+ accept - JSON for Modern C++      
 
 
  
 
  
 
 
 
 
  
 
 
 
 
 
  
 
 
 
 
       
nlohmann::basic_json::accept
 
// (1)
 template<typename InputType>
 static bool accept(InputType&& i,
                    const bool ignore_comments = false,
@@ -36,4 +36,4 @@
               << json::accept(invalid_text) << '\n';
 }
 
 
Output:
 
true false
-
  
See also
 
     
  • parse - deserialize from a compatible input
    •  
  • operator>> - deserialize from stream
    •  
 
Version history
 
     
  • Added in version 3.0.0.
    •  
  • Ignoring comments via ignore_comments added in version 3.9.0.
    •  
  • Changed runtime assertion in case of FILE* null pointers to exception in version 3.12.0.
    •  
  • Added ignore_trailing_commas in version 3.12.1.
    •  
 
 
Deprecation
 
Overload (2) replaces calls to accept with a pair of iterators as their first parameter which has been deprecated in version 3.8.0. This overload will be removed in version 4.0.0. Please replace all calls like accept({ptr, ptr+len}, ...); with accept(ptr, ptr+len, ...);.
 
You should be warned by your compiler with a -Wdeprecated-declarations warning if you are using a deprecated function.
 
   
 
   
  
 
 
 
 
 
 Copyright © 2013-2025 Niels Lohmann 
 
 
             
 
 
 
 
 
 
 
     
\ No newline at end of file
+

See also

  • parse - deserialize from a compatible input
  • operator>> - deserialize from stream

Version history

  • Added in version 3.0.0.
  • Ignoring comments via ignore_comments added in version 3.9.0.
  • Changed runtime assertion in case of FILE* null pointers to exception in version 3.12.0.
  • Added ignore_trailing_commas in version 3.12.1.

Deprecation

Overload (2) replaces calls to accept with a pair of iterators as their first parameter which has been deprecated in version 3.8.0. This overload will be removed in version 4.0.0. Please replace all calls like accept({ptr, ptr+len}, ...); with accept(ptr, ptr+len, ...);.

You should be warned by your compiler with a -Wdeprecated-declarations warning if you are using a deprecated function.

Copyright © 2013-2025 Niels Lohmann
\ No newline at end of file diff --git a/api/basic_json/array/index.html b/api/basic_json/array/index.html index b70c8bd26..a360644a9 100644 --- a/api/basic_json/array/index.html +++ b/api/basic_json/array/index.html @@ -1,4 +1,4 @@ - array - JSON for Modern C++
Skip to content

nlohmann::basic_json::array

static basic_json array(initializer_list_t init = {});
+ array - JSON for Modern C++      
 
 
  
 
  
 
 
 
 
  
 
 
 
 
 
  
 
 
 
 
       
nlohmann::basic_json::array
 
static basic_json array(initializer_list_t init = {});
 
 
Creates a JSON array value from a given initializer list. That is, given a list of values a, b, c, creates the JSON value [a, b, c]. If the initializer list is empty, the empty array [] is created.
 
Parameters
 
 
init (in)
 
initializer list with JSON values to create an array from (optional)
 
 
Return value
 
JSON array value
 
Exception safety
 
Strong guarantee: if an exception is thrown, there are no changes in the JSON value.
 
Complexity
 
Linear in the size of init.
 
Notes
 
This function is only needed to express two edge cases that cannot be realized with the initializer list constructor (basic_json(initializer_list_t, bool, value_t)). These cases are:
 
     
  1. creating an array whose elements are all pairs whose first element is a string -- in this case, the initializer list constructor would create an object, taking the first elements as keys
    2.  
  2. creating an empty array -- passing the empty initializer list to the initializer list constructor yields an empty object
    3.  
 
Examples
 
 Example 
The following code shows an example for the array function.
 
#include <iostream>
 #include <nlohmann/json.hpp>
 
@@ -22,4 +22,4 @@
 []
 [1,2,3,4]
 [["one",1],["two",2]]
-
 
 
See also
  
Version history
 
     
  • Added in version 1.0.0.
    •  
   
 
   
  
 
 
 
 
 
 Copyright © 2013-2025 Niels Lohmann 
 
 
             
 
 
 
 
 
 
 
     
\ No newline at end of file
+

See also

Version history

  • Added in version 1.0.0.
Copyright © 2013-2025 Niels Lohmann
\ No newline at end of file diff --git a/api/basic_json/array_t/index.html b/api/basic_json/array_t/index.html index 5b604adf2..22ed9c2d6 100644 --- a/api/basic_json/array_t/index.html +++ b/api/basic_json/array_t/index.html @@ -1,4 +1,4 @@ - array_t - JSON for Modern C++
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nlohmann::basic_json::array_t

using array_t = ArrayType<basic_json, AllocatorType<basic_json>>;
+ array_t - JSON for Modern C++      
 
 
  
 
  
 
 
 
 
  
 
 
 
 
 
  
 
 
 
 
       
nlohmann::basic_json::array_t
 
using array_t = ArrayType<basic_json, AllocatorType<basic_json>>;
 
 
The type used to store JSON arrays.
 
RFC 8259 describes JSON arrays as follows:
 
 
An array is an ordered sequence of zero or more values.
 
 
To store objects in C++, a type is defined by the template parameters explained below.
 
Template parameters
 
 
ArrayType
 
container type to store arrays (e.g., std::vector or std::list)
 
AllocatorType
 
the allocator to use for objects (e.g., std::allocator)
 
 
Notes
 
Default type
 
With the default values for ArrayType (std::vector) and AllocatorType (std::allocator), the default value for array_t is:
 
std::vector<
   basic_json, // value_type
   std::allocator<basic_json> // allocator_type
@@ -14,4 +14,4 @@
     std::cout << std::boolalpha << std::is_same<std::vector<json>, json::array_t>::value << std::endl;
 }
 
 
Output:
 
true
-
  
Version history
 
     
  • Added in version 1.0.0.
    •  
   
 
   
  
 
 
 
 
 
 Copyright © 2013-2025 Niels Lohmann 
 
 
             
 
 
 
 
 
 
 
     
\ No newline at end of file
+

Version history

  • Added in version 1.0.0.
Copyright © 2013-2025 Niels Lohmann
\ No newline at end of file diff --git a/api/basic_json/at/index.html b/api/basic_json/at/index.html index 42e3e9785..693bb6d35 100644 --- a/api/basic_json/at/index.html +++ b/api/basic_json/at/index.html @@ -1,4 +1,4 @@ - at - JSON for Modern C++
Skip to content

nlohmann::basic_json::at

// (1)
+ at - JSON for Modern C++      
 
 
  
 
  
 
 
 
 
  
 
 
 
 
 
  
 
 
 
 
       
nlohmann::basic_json::at
 
// (1)
 reference at(size_type idx);
 const_reference at(size_type idx) const;
 
@@ -498,4 +498,4 @@
 [json.exception.out_of_range.402] array index '-' (2) is out of range
 [json.exception.out_of_range.403] key 'foo' not found
 [json.exception.out_of_range.404] unresolved reference token 'foo'
-
  
See also
  
Version history
 
     
  1. Added in version 1.0.0.
    2.  
  2. Added in version 1.0.0.
    3.  
  3. Added in version 3.11.0.
    4.  
  4. Added in version 2.0.0.
    5.  
   
 
   
  
 
 
 
 
 
 Copyright © 2013-2025 Niels Lohmann 
 
 
             
 
 
 
 
 
 
 
     
\ No newline at end of file
+

See also

Version history

  1. Added in version 1.0.0.
  2. Added in version 1.0.0.
  3. Added in version 3.11.0.
  4. Added in version 2.0.0.
Copyright © 2013-2025 Niels Lohmann
\ No newline at end of file diff --git a/api/basic_json/back/index.html b/api/basic_json/back/index.html index 1694ed65f..902b1c030 100644 --- a/api/basic_json/back/index.html +++ b/api/basic_json/back/index.html @@ -1,4 +1,4 @@ - back - JSON for Modern C++
Skip to content

nlohmann::basic_json::back

reference back();
+ back - JSON for Modern C++      
 
 
  
 
  
 
 
 
 
  
 
 
 
 
 
  
 
 
 
 
       
nlohmann::basic_json::back
 
reference back();
 
 const_reference back() const;
 
 
Returns a reference to the last element in the container. For a JSON container c, the expression c.back() is equivalent to
 
auto tmp = c.end();
@@ -49,4 +49,4 @@
 16
 "Hello, world"
 [json.exception.invalid_iterator.214] cannot get value
-
  
See also
 
     
  • front to access the first element
    •  
 
Version history
 
     
  • Added in version 1.0.0.
    •  
  • Adjusted code to return reference to binary values in version 3.8.0.
    •  
   
 
   
  
 
 
 
 
 
 Copyright © 2013-2025 Niels Lohmann 
 
 
             
 
 
 
 
 
 
 
     
\ No newline at end of file
+

See also

  • front to access the first element

Version history

  • Added in version 1.0.0.
  • Adjusted code to return reference to binary values in version 3.8.0.
Copyright © 2013-2025 Niels Lohmann
\ No newline at end of file diff --git a/api/basic_json/basic_json/index.html b/api/basic_json/basic_json/index.html index 7c29931bf..9e5209444 100644 --- a/api/basic_json/basic_json/index.html +++ b/api/basic_json/basic_json/index.html @@ -1,4 +1,4 @@ - (Constructor) - JSON for Modern C++
Skip to content

nlohmann::basic_json::basic_json

// (1)
+ (Constructor) - JSON for Modern C++      
 
 
  
 
  
 
 
 
 
  
 
 
 
 
 
  
 
 
 
 
       
nlohmann::basic_json::basic_json
 
// (1)
 basic_json(const value_t v);
 
 // (2)
@@ -455,4 +455,4 @@
 }
 
 
Output:
 
null
 23
-
  
Version history
 
     
  1. Since version 1.0.0.
    2.  
  2. Since version 1.0.0.
    3.  
  3. Since version 2.1.0.
    4.  
  4. Since version 3.2.0.
    5.  
  5. Since version 1.0.0.
    6.  
  6. Since version 1.0.0.
    7.  
  7. Since version 1.0.0.
    8.  
  8. Since version 1.0.0.
    9.  
  9. Since version 1.0.0.
    10.  
   
 
   
  
 
 
 
 
 
 Copyright © 2013-2025 Niels Lohmann 
 
 
             
 
 
 
 
 
 
 
     
\ No newline at end of file
+

Version history

  1. Since version 1.0.0.
  2. Since version 1.0.0.
  3. Since version 2.1.0.
  4. Since version 3.2.0.
  5. Since version 1.0.0.
  6. Since version 1.0.0.
  7. Since version 1.0.0.
  8. Since version 1.0.0.
  9. Since version 1.0.0.
Copyright © 2013-2025 Niels Lohmann
\ No newline at end of file diff --git a/api/basic_json/begin/index.html b/api/basic_json/begin/index.html index dec4736aa..80ee43053 100644 --- a/api/basic_json/begin/index.html +++ b/api/basic_json/begin/index.html @@ -1,4 +1,4 @@ - begin - JSON for Modern C++
Skip to content

nlohmann::basic_json::begin

iterator begin() noexcept;
+ begin - JSON for Modern C++      
 
 
  
 
  
 
 
 
 
  
 
 
 
 
 
  
 
 
 
 
       
nlohmann::basic_json::begin
 
iterator begin() noexcept;
 const_iterator begin() const noexcept;
 
 
Returns an iterator to the first element.
 
Illustration from cppreference.com
 
Return value
 
iterator to the first element
 
Exception safety
 
No-throw guarantee: this member function never throws exceptions.
 
Complexity
 
Constant.
 
Examples
 
 Example 
The following code shows an example for begin().
 
#include <iostream>
 #include <nlohmann/json.hpp>
@@ -17,4 +17,4 @@
     std::cout << *it << '\n';
 }
 
 
Output:
 
1
-
 
 
Version history
 
     
  • Added in version 1.0.0.
    •  
   
 
   
  
 
 
 
 
 
 Copyright © 2013-2025 Niels Lohmann 
 
 
             
 
 
 
 
 
 
 
     
\ No newline at end of file
+

Version history

  • Added in version 1.0.0.
Copyright © 2013-2025 Niels Lohmann
\ No newline at end of file diff --git a/api/basic_json/binary/index.html b/api/basic_json/binary/index.html index 1a8ec9e8c..486046e99 100644 --- a/api/basic_json/binary/index.html +++ b/api/basic_json/binary/index.html @@ -1,4 +1,4 @@ - binary - JSON for Modern C++
Skip to content

nlohmann::basic_json::binary

// (1)
+ binary - JSON for Modern C++      
 
 
  
 
  
 
 
 
 
  
 
 
 
 
 
  
 
 
 
 
       
nlohmann::basic_json::binary
 
// (1)
 static basic_json binary(const typename binary_t::container_type& init);
 static basic_json binary(typename binary_t::container_type&& init);
 
@@ -24,4 +24,4 @@
     std::cout << "type: " << j.type_name() << ", subtype: " << j.get_binary().subtype() << std::endl;
 }
 
 
Output:
 
type: binary, subtype: 42
-
  
Version history
 
     
  • Added in version 3.8.0.
    •  
   
 
   
  
 
 
 
 
 
 Copyright © 2013-2025 Niels Lohmann 
 
 
             
 
 
 
 
 
 
 
     
\ No newline at end of file
+

Version history

  • Added in version 3.8.0.
Copyright © 2013-2025 Niels Lohmann
\ No newline at end of file diff --git a/api/basic_json/binary_t/index.html b/api/basic_json/binary_t/index.html index 407b328c8..e89cb63e9 100644 --- a/api/basic_json/binary_t/index.html +++ b/api/basic_json/binary_t/index.html @@ -1,4 +1,4 @@ - binary_t - JSON for Modern C++
Skip to content

nlohmann::basic_json::binary_t

using binary_t = byte_container_with_subtype<BinaryType>;
+ binary_t - JSON for Modern C++      
 
 
  
 
  
 
 
 
 
  
 
 
 
 
 
  
 
 
 
 
       
nlohmann::basic_json::binary_t
 
using binary_t = byte_container_with_subtype<BinaryType>;
 
 
This type is a type designed to carry binary data that appears in various serialized formats, such as CBOR's Major Type 2, MessagePack's bin, and BSON's generic binary subtype. This type is NOT a part of standard JSON and exists solely for compatibility with these binary types. As such, it is simply defined as an ordered sequence of zero or more byte values.
 
Additionally, as an implementation detail, the subtype of the binary data is carried around as a std::uint64_t, which is compatible with both of the binary data formats that use binary subtyping, (though the specific numbering is incompatible with each other, and it is up to the user to translate between them). The subtype is added to BinaryType via the helper type byte_container_with_subtype.
 
CBOR's RFC 7049 describes this type as:
 
 
Major type 2: a byte string. The string's length in bytes is represented following the rules for positive integers (major type 0).
 
 
MessagePack's documentation on the bin type family describes this type as:
 
 
Bin format family stores a byte array in 2, 3, or 5 bytes of extra bytes in addition to the size of the byte array.
 
 
BSON's specifications describe several binary types; however, this type is intended to represent the generic binary type which has the description:
 
 
Generic binary subtype - This is the most commonly used binary subtype and should be the 'default' for drivers and tools.
 
 
None of these impose any limitations on the internal representation other than the basic unit of storage be some type of array whose parts are decomposable into bytes.
 
The default representation of this binary format is a std::vector<std::uint8_t>, which is a very common way to represent a byte array in modern C++.
 
Template parameters
 
 
BinaryType
 
container type to store arrays
 
 
Notes
 
Default type
 
The default values for BinaryType is std::vector<std::uint8_t>.
 
Storage
 
Binary Arrays are stored as pointers in a basic_json type. That is, for any access to array values, a pointer of the type binary_t* must be dereferenced.
 
Notes on subtypes
 
     
  •  
    CBOR
     
       
    • Binary values are represented as byte strings. Subtypes are written as tags.
      •  
     
    •  
  •  
    MessagePack
     
       
    • If a subtype is given and the binary array contains exactly 1, 2, 4, 8, or 16 elements, the fixext family (fixext1, fixext2, fixext4, fixext8) is used. For other sizes, the ext family (ext8, ext16, ext32) is used. The subtype is then added as a signed 8-bit integer.
      •  
    • If no subtype is given, the bin family (bin8, bin16, bin32) is used.
      •  
     
    •  
  •  
    BSON
     
       
    • If a subtype is given, it is used and added as an unsigned 8-bit integer.
      •  
    • If no subtype is given, the generic binary subtype 0x00 is used.
      •  
     
    •  
 
Examples
 
 Example 
The following code shows that binary_t is by default, a typedef to nlohmann::byte_container_with_subtype<std::vector<std::uint8_t>>.
 
#include <iostream>
 #include <iomanip>
 #include <nlohmann/json.hpp>
@@ -10,4 +10,4 @@
     std::cout << std::boolalpha << std::is_same<nlohmann::byte_container_with_subtype<std::vector<std::uint8_t>>, json::binary_t>::value << std::endl;
 }
 
 
Output:
 
true
-
 
 
See also
  
Version history
 
     
  • Added in version 3.8.0. Changed the type of subtype to std::uint64_t in version 3.10.0.
    •  
   
 
   
  
 
 
 
 
 
 Copyright © 2013-2025 Niels Lohmann 
 
 
             
 
 
 
 
 
 
 
     
\ No newline at end of file
+

See also

Version history

  • Added in version 3.8.0. Changed the type of subtype to std::uint64_t in version 3.10.0.
Copyright © 2013-2025 Niels Lohmann
\ No newline at end of file diff --git a/api/basic_json/boolean_t/index.html b/api/basic_json/boolean_t/index.html index 2ce4ccc0f..178166072 100644 --- a/api/basic_json/boolean_t/index.html +++ b/api/basic_json/boolean_t/index.html @@ -1,4 +1,4 @@ - boolean_t - JSON for Modern C++
Skip to content

nlohmann::basic_json::boolean_t

using boolean_t = BooleanType;
+ boolean_t - JSON for Modern C++      
 
 
  
 
  
 
 
 
 
  
 
 
 
 
 
  
 
 
 
 
       
nlohmann::basic_json::boolean_t
 
using boolean_t = BooleanType;
 
 
The type used to store JSON booleans.
 
RFC 8259 implicitly describes a boolean as a type which differentiates the two literals true and false.
 
To store objects in C++, a type is defined by the template parameter BooleanType which chooses the type to use.
 
Notes
 
Default type
 
With the default values for BooleanType (bool), the default value for boolean_t is bool.
 
Storage
 
Boolean values are stored directly inside a basic_json type.
 
Examples
 
 Example 
The following code shows that boolean_t is by default, a typedef to bool.
 
#include <iostream>
 #include <iomanip>
 #include <nlohmann/json.hpp>
@@ -10,4 +10,4 @@
     std::cout << std::boolalpha << std::is_same<bool, json::boolean_t>::value << std::endl;
 }
 
 
Output:
 
true
-
 
 
Version history
 
     
  • Added in version 1.0.0.
    •  
   
 
   
  
 
 
 
 
 
 Copyright © 2013-2025 Niels Lohmann 
 
 
             
 
 
 
 
 
 
 
     
\ No newline at end of file
+

Version history

  • Added in version 1.0.0.
Copyright © 2013-2025 Niels Lohmann
\ No newline at end of file diff --git a/api/basic_json/cbegin/index.html b/api/basic_json/cbegin/index.html index 6b50a23dd..d3ab62b79 100644 --- a/api/basic_json/cbegin/index.html +++ b/api/basic_json/cbegin/index.html @@ -1,4 +1,4 @@ - cbegin - JSON for Modern C++
Skip to content

nlohmann::basic_json::cbegin

const_iterator cbegin() const noexcept;
+ cbegin - JSON for Modern C++      
 
 
  
 
  
 
 
 
 
  
 
 
 
 
 
  
 
 
 
 
       
nlohmann::basic_json::cbegin
 
const_iterator cbegin() const noexcept;
 
 
Returns an iterator to the first element.
 
Illustration from cppreference.com
 
Return value
 
iterator to the first element
 
Exception safety
 
No-throw guarantee: this member function never throws exceptions.
 
Complexity
 
Constant.
 
Examples
 
 Example 
The following code shows an example for cbegin().
 
#include <iostream>
 #include <nlohmann/json.hpp>
 
@@ -16,4 +16,4 @@
     std::cout << *it << '\n';
 }
 
 
Output:
 
1
-
 
 
Version history
 
     
  • Added in version 1.0.0.
    •  
   
 
   
  
 
 
 
 
 
 Copyright © 2013-2025 Niels Lohmann 
 
 
             
 
 
 
 
 
 
 
     
\ No newline at end of file
+

Version history

  • Added in version 1.0.0.
Copyright © 2013-2025 Niels Lohmann
\ No newline at end of file diff --git a/api/basic_json/cbor_tag_handler_t/index.html b/api/basic_json/cbor_tag_handler_t/index.html index 10e3e774d..58eee320d 100644 --- a/api/basic_json/cbor_tag_handler_t/index.html +++ b/api/basic_json/cbor_tag_handler_t/index.html @@ -1,4 +1,4 @@ - cbor_tag_handler_t - JSON for Modern C++
Skip to content

nlohmann::basic_json::cbor_tag_handler_t

enum class cbor_tag_handler_t
+ cbor_tag_handler_t - JSON for Modern C++      
 
 
  
 
  
 
 
 
 
  
 
 
 
 
 
  
 
 
 
 
       
nlohmann::basic_json::cbor_tag_handler_t
 
enum class cbor_tag_handler_t
 {
     error,
     ignore,
@@ -35,4 +35,4 @@
 
 
Output:
 
[json.exception.parse_error.112] parse error at byte 1: syntax error while parsing CBOR value: invalid byte: 0xD8
 {"bytes":[202,254,186,190],"subtype":null}
 {"bytes":[202,254,186,190],"subtype":66}
-
  
Version history
 
     
  • Added in version 3.9.0. Added value store in 3.10.0.
    •  
   
 
   
  
 
 
 
 
 
 Copyright © 2013-2025 Niels Lohmann 
 
 
             
 
 
 
 
 
 
 
     
\ No newline at end of file
+

Version history

  • Added in version 3.9.0. Added value store in 3.10.0.
Copyright © 2013-2025 Niels Lohmann
\ No newline at end of file diff --git a/api/basic_json/cend/index.html b/api/basic_json/cend/index.html index 60b68d408..ef449014b 100644 --- a/api/basic_json/cend/index.html +++ b/api/basic_json/cend/index.html @@ -1,4 +1,4 @@ - cend - JSON for Modern C++
Skip to content

nlohmann::basic_json::cend

const_iterator cend() const noexcept;
+ cend - JSON for Modern C++      
 
 
  
 
  
 
 
 
 
  
 
 
 
 
 
  
 
 
 
 
       
nlohmann::basic_json::cend
 
const_iterator cend() const noexcept;
 
 
Returns an iterator to one past the last element.
 
Illustration from cppreference.com
 
Return value
 
iterator one past the last element
 
Exception safety
 
No-throw guarantee: this member function never throws exceptions.
 
Complexity
 
Constant.
 
Examples
 
 Example 
The following code shows an example for cend().
 
#include <iostream>
 #include <nlohmann/json.hpp>
 
@@ -19,4 +19,4 @@
     std::cout << *it << '\n';
 }
 
 
Output:
 
5
-
 
 
Version history
 
     
  • Added in version 1.0.0.
    •  
   
 
   
  
 
 
 
 
 
 Copyright © 2013-2025 Niels Lohmann 
 
 
             
 
 
 
 
 
 
 
     
\ No newline at end of file
+

Version history

  • Added in version 1.0.0.
Copyright © 2013-2025 Niels Lohmann
\ No newline at end of file diff --git a/api/basic_json/clear/index.html b/api/basic_json/clear/index.html index e2502904a..cb9463b6a 100644 --- a/api/basic_json/clear/index.html +++ b/api/basic_json/clear/index.html @@ -1,4 +1,4 @@ - clear - JSON for Modern C++
Skip to content

nlohmann::basic_json::clear

void clear() noexcept;
+ clear - JSON for Modern C++      
 
 
  
 
  
 
 
 
 
  
 
 
 
 
 
  
 
 
 
 
       
nlohmann::basic_json::clear
 
void clear() noexcept;
 
 
Clears the content of a JSON value and resets it to the default value as if basic_json(value_t) would have been called with the current value type from type():
 
  
 Value type initial value 
   
 null null 
 
 boolean false 
 
 string "" 
 
 number 0 
 
 binary An empty byte vector 
 
 object {} 
 
 array [] 
  
 
Has the same effect as calling
 
*this = basic_json(type());
 
 
Exception safety
 
No-throw guarantee: this function never throws exceptions.
 
Complexity
 
Linear in the size of the JSON value.
 
Notes
 
All iterators, pointers, and references related to this container are invalidated.
 
Examples
 
 Example 
The example below shows the effect of clear() to different JSON types.
 
#include <iostream>
 #include <nlohmann/json.hpp>
@@ -41,4 +41,4 @@
 {}
 []
 ""
-
 
 
Version history
 
     
  • Added in version 1.0.0.
    •  
  • Added support for binary types in version 3.8.0.
    •  
   
 
   
  
 
 
 
 
 
 Copyright © 2013-2025 Niels Lohmann 
 
 
             
 
 
 
 
 
 
 
     
\ No newline at end of file
+

Version history

  • Added in version 1.0.0.
  • Added support for binary types in version 3.8.0.
Copyright © 2013-2025 Niels Lohmann
\ No newline at end of file diff --git a/api/basic_json/contains/index.html b/api/basic_json/contains/index.html index 523d41945..19a22ca05 100644 --- a/api/basic_json/contains/index.html +++ b/api/basic_json/contains/index.html @@ -1,4 +1,4 @@ - contains - JSON for Modern C++
Skip to content

nlohmann::basic_json::contains

// (1)
+ contains - JSON for Modern C++      
 
 
  
 
  
 
 
 
 
  
 
 
 
 
 
  
 
 
 
 
       
nlohmann::basic_json::contains
 
// (1)
 bool contains(const typename object_t::key_type& key) const;
 
 // (2)
@@ -101,4 +101,4 @@
 false
 false
 false
-
  
Version history
 
     
  1. Added in version 3.11.0.
    2.  
  2. Added in version 3.6.0. Extended template KeyType to support comparable types in version 3.11.0.
    3.  
  3. Added in version 3.7.0.
    4.  
   
 
   
  
 
 
 
 
 
 Copyright © 2013-2025 Niels Lohmann 
 
 
             
 
 
 
 
 
 
 
     
\ No newline at end of file
+

Version history

  1. Added in version 3.11.0.
  2. Added in version 3.6.0. Extended template KeyType to support comparable types in version 3.11.0.
  3. Added in version 3.7.0.
Copyright © 2013-2025 Niels Lohmann
\ No newline at end of file diff --git a/api/basic_json/count/index.html b/api/basic_json/count/index.html index 1f5371a21..bea965564 100644 --- a/api/basic_json/count/index.html +++ b/api/basic_json/count/index.html @@ -1,4 +1,4 @@ - count - JSON for Modern C++
Skip to content

nlohmann::basic_json::count

// (1)
+ count - JSON for Modern C++      
 
 
  
 
  
 
 
 
 
  
 
 
 
 
 
  
 
 
 
 
       
nlohmann::basic_json::count
 
// (1)
 size_type count(const typename object_t::key_type& key) const;
 
 // (2)
@@ -46,4 +46,4 @@
 }
 
 
Output:
 
number of elements with key "two": 1
 number of elements with key "three": 0
-
  
Version history
 
     
  1. Added in version 3.11.0.
    2.  
  2. Added in version 1.0.0. Changed parameter key type to KeyType&& in version 3.11.0.
    3.  
   
 
   
  
 
 
 
 
 
 Copyright © 2013-2025 Niels Lohmann 
 
 
             
 
 
 
 
 
 
 
     
\ No newline at end of file
+

Version history

  1. Added in version 3.11.0.
  2. Added in version 1.0.0. Changed parameter key type to KeyType&& in version 3.11.0.
Copyright © 2013-2025 Niels Lohmann
\ No newline at end of file diff --git a/api/basic_json/crbegin/index.html b/api/basic_json/crbegin/index.html index 5e6684648..be13eab55 100644 --- a/api/basic_json/crbegin/index.html +++ b/api/basic_json/crbegin/index.html @@ -1,4 +1,4 @@ - crbegin - JSON for Modern C++
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nlohmann::basic_json::crbegin

const_reverse_iterator crbegin() const noexcept;
+ crbegin - JSON for Modern C++      
 
 
  
 
  
 
 
 
 
  
 
 
 
 
 
  
 
 
 
 
       
nlohmann::basic_json::crbegin
 
const_reverse_iterator crbegin() const noexcept;
 
 
Returns an iterator to the reverse-beginning; that is, the last element.
 
Illustration from cppreference.com
 
Return value
 
reverse iterator to the first element
 
Exception safety
 
No-throw guarantee: this member function never throws exceptions.
 
Complexity
 
Constant.
 
Examples
 
 Example 
The following code shows an example for crbegin().
 
#include <iostream>
 #include <nlohmann/json.hpp>
 
@@ -16,4 +16,4 @@
     std::cout << *it << '\n';
 }
 
 
Output:
 
5
-
 
 
Version history
 
     
  • Added in version 1.0.0.
    •  
   
 
   
  
 
 
 
 
 
 Copyright © 2013-2025 Niels Lohmann 
 
 
             
 
 
 
 
 
 
 
     
\ No newline at end of file
+

Version history

  • Added in version 1.0.0.
Copyright © 2013-2025 Niels Lohmann
\ No newline at end of file diff --git a/api/basic_json/crend/index.html b/api/basic_json/crend/index.html index 08759744f..f07eb6274 100644 --- a/api/basic_json/crend/index.html +++ b/api/basic_json/crend/index.html @@ -1,4 +1,4 @@ - crend - JSON for Modern C++
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nlohmann::basic_json::crend

const_reverse_iterator crend() const noexcept;
+ crend - JSON for Modern C++      
 
 
  
 
  
 
 
 
 
  
 
 
 
 
 
  
 
 
 
 
       
nlohmann::basic_json::crend
 
const_reverse_iterator crend() const noexcept;
 
 
Returns an iterator to the reverse-end; that is, one before the first element. This element acts as a placeholder, attempting to access it results in undefined behavior.
 
Illustration from cppreference.com
 
Return value
 
reverse iterator to the element following the last element
 
Exception safety
 
No-throw guarantee: this member function never throws exceptions.
 
Complexity
 
Constant.
 
Examples
 
 Example 
The following code shows an example for eend().
 
#include <iostream>
 #include <nlohmann/json.hpp>
 
@@ -19,4 +19,4 @@
     std::cout << *it << '\n';
 }
 
 
Output:
 
1
-
 
 
Version history
 
     
  • Added in version 1.0.0.
    •  
   
 
   
  
 
 
 
 
 
 Copyright © 2013-2025 Niels Lohmann 
 
 
             
 
 
 
 
 
 
 
     
\ No newline at end of file
+

Version history

  • Added in version 1.0.0.
Copyright © 2013-2025 Niels Lohmann
\ No newline at end of file diff --git a/api/basic_json/default_object_comparator_t/index.html b/api/basic_json/default_object_comparator_t/index.html index e068d221f..c4b9f66c2 100644 --- a/api/basic_json/default_object_comparator_t/index.html +++ b/api/basic_json/default_object_comparator_t/index.html @@ -1,4 +1,4 @@ - default_object_comparator_t - JSON for Modern C++
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nlohmann::basic_json::default_object_comparator_t

using default_object_comparator_t = std::less<StringType>;  // until C++14
+ default_object_comparator_t - JSON for Modern C++      
 
 
  
 
  
 
 
 
 
  
 
 
 
 
 
  
 
 
 
 
       
nlohmann::basic_json::default_object_comparator_t
 
using default_object_comparator_t = std::less<StringType>;  // until C++14
 
 using default_object_comparator_t = std::less<>;            // since C++14
 
 
The default comparator used by object_t.
 
Since C++14 a transparent comparator is used which prevents unnecessary string construction when looking up a key in an object.
 
The actual comparator used depends on object_t and can be obtained via object_comparator_t.
 
Examples
 
 Example 
The example below demonstrates the default comparator.
 
#include <iostream>
@@ -14,4 +14,4 @@
 }
 
 
Output:
 
one < two : true
 three < four : false
-
 
 
Version history
 
     
  • Added in version 3.11.0.
    •  
   
 
   
  
 
 
 
 
 
 Copyright © 2013-2025 Niels Lohmann 
 
 
             
 
 
 
 
 
 
 
     
\ No newline at end of file
+

Version history

  • Added in version 3.11.0.
Copyright © 2013-2025 Niels Lohmann
\ No newline at end of file diff --git a/api/basic_json/diff/index.html b/api/basic_json/diff/index.html index 3d2149bd3..ca484d5f1 100644 --- a/api/basic_json/diff/index.html +++ b/api/basic_json/diff/index.html @@ -1,4 +1,4 @@ - diff - JSON for Modern C++
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nlohmann::basic_json::diff

static basic_json diff(const basic_json& source,
+ diff - JSON for Modern C++      
 
 
  
 
  
 
 
 
 
  
 
 
 
 
 
  
 
 
 
 
       
nlohmann::basic_json::diff
 
static basic_json diff(const basic_json& source,
                        const basic_json& target);
 
 
Creates a JSON Patch so that value source can be changed into the value target by calling patch function.
 
For two JSON values source and target, the following code yields always true: 
source.patch(diff(source, target)) == target;
 
 
Parameters
 
 
source (in)
 
JSON value to compare from
 
target (in)
 
JSON value to compare against
 
 
Return value
 
a JSON patch to convert the source to target
 
Exception safety
 
Strong guarantee: if an exception is thrown, there are no changes in the JSON value.
 
Complexity
 
Linear in the lengths of source and target.
 
Notes
 
Currently, only remove, add, and replace operations are generated.
 
Examples
 
 Example 
The following code shows how a JSON patch is created as a diff for two JSON values.
 
#include <iostream>
@@ -63,4 +63,4 @@
         "world"
     ]
 }
-
 
 
See also
  
Version history
 
     
  • Added in version 2.0.0.
    •  
   
 
   
  
 
 
 
 
 
 Copyright © 2013-2025 Niels Lohmann 
 
 
             
 
 
 
 
 
 
 
     
\ No newline at end of file
+

See also

Version history

  • Added in version 2.0.0.
Copyright © 2013-2025 Niels Lohmann
\ No newline at end of file diff --git a/api/basic_json/dump/index.html b/api/basic_json/dump/index.html index 77d1dd81e..8a03874d5 100644 --- a/api/basic_json/dump/index.html +++ b/api/basic_json/dump/index.html @@ -1,4 +1,4 @@ - dump - JSON for Modern C++
Skip to content

nlohmann::basic_json::dump

string_t dump(const int indent = -1,
+ dump - JSON for Modern C++      
 
 
  
 
  
 
 
 
 
  
 
 
 
 
 
  
 
 
 
 
       
nlohmann::basic_json::dump
 
string_t dump(const int indent = -1,
               const char indent_char = ' ',
               const bool ensure_ascii = false,
               const error_handler_t error_handler = error_handler_t::strict) const;
@@ -105,4 +105,4 @@
 [json.exception.type_error.316] invalid UTF-8 byte at index 2: 0xA9
 string with replaced invalid characters: "ä�ü"
 string with ignored invalid characters: "äü"
-
  
Version history
 
     
  • Added in version 1.0.0.
    •  
  • Indentation character indent_char, option ensure_ascii and exceptions added in version 3.0.0.
    •  
  • Error handlers added in version 3.4.0.
    •  
  • Serialization of binary values added in version 3.8.0.
    •  
   
 
   
  
 
 
 
 
 
 Copyright © 2013-2025 Niels Lohmann 
 
 
             
 
 
 
 
 
 
 
     
\ No newline at end of file
+

Version history

  • Added in version 1.0.0.
  • Indentation character indent_char, option ensure_ascii and exceptions added in version 3.0.0.
  • Error handlers added in version 3.4.0.
  • Serialization of binary values added in version 3.8.0.
Copyright © 2013-2025 Niels Lohmann
\ No newline at end of file diff --git a/api/basic_json/emplace/index.html b/api/basic_json/emplace/index.html index f9add78b7..0e63e4a6b 100644 --- a/api/basic_json/emplace/index.html +++ b/api/basic_json/emplace/index.html @@ -1,4 +1,4 @@ - emplace - JSON for Modern C++
Skip to content

nlohmann::basic_json::emplace

template<class... Args>
+ emplace - JSON for Modern C++      
 
 
  
 
  
 
 
 
 
  
 
 
 
 
 
  
 
 
 
 
       
nlohmann::basic_json::emplace
 
template<class... Args>
 std::pair<iterator, bool> emplace(Args&& ... args);
 
 
Inserts a new element into a JSON object constructed in-place with the given args if there is no element with the key in the container. If the function is called on a JSON null value, an empty object is created before appending the value created from args.
 
Template parameters
 
 
Args
 
compatible types to create a basic_json object
 
 
Iterator invalidation
 
For ordered_json, adding a value to an object can yield a reallocation, in which case all iterators (including the end() iterator) and all references to the elements are invalidated.
 
Parameters
 
 
args (in)
 
arguments to forward to a constructor of basic_json
 
 
Return value
 
a pair consisting of an iterator to the inserted element, or the already-existing element if no insertion happened, and a bool denoting whether the insertion took place.
 
Exceptions
 
Throws type_error.311 when called on a type other than JSON object or null; example: "cannot use emplace() with number"
 
Complexity
 
Logarithmic in the size of the container, O(log(size())).
 
Examples
 
 Example 
The example shows how emplace() can be used to add elements to a JSON object. Note how the null value was silently converted to a JSON object. Further note how no value is added if there was already one value stored with the same key.
 
#include <iostream>
 #include <nlohmann/json.hpp>
@@ -37,4 +37,4 @@
 3 true
 {"A":"a","B":"b"}
 "b" false
-
 
 
Version history
 
     
  • Since version 2.0.8.
    •  
   
 
   
  
 
 
 
 
 
 Copyright © 2013-2025 Niels Lohmann 
 
 
             
 
 
 
 
 
 
 
     
\ No newline at end of file
+

Version history

  • Since version 2.0.8.
Copyright © 2013-2025 Niels Lohmann
\ No newline at end of file diff --git a/api/basic_json/emplace_back/index.html b/api/basic_json/emplace_back/index.html index c10cd47f6..a8810cc69 100644 --- a/api/basic_json/emplace_back/index.html +++ b/api/basic_json/emplace_back/index.html @@ -1,4 +1,4 @@ - emplace_back - JSON for Modern C++
Skip to content

nlohmann::basic_json::emplace_back

template<class... Args>
+ emplace_back - JSON for Modern C++      
 
 
  
 
  
 
 
 
 
  
 
 
 
 
 
  
 
 
 
 
       
nlohmann::basic_json::emplace_back
 
template<class... Args>
 reference emplace_back(Args&& ... args);
 
 
Creates a JSON value from the passed parameters args to the end of the JSON value. If the function is called on a JSON null value, an empty array is created before appending the value created from args.
 
Template parameters
 
 
Args
 
compatible types to create a basic_json object
 
 
Iterator invalidation
 
By adding an element to the end of the array, a reallocation can happen, in which case all iterators (including the end() iterator) and all references to the elements are invalidated. Otherwise, only the end() iterator is invalidated.
 
Parameters
 
 
args (in)
 
arguments to forward to a constructor of basic_json
 
 
Return value
 
reference to the inserted element
 
Exceptions
 
Throws type_error.311 when called on a type other than JSON array or null; example: "cannot use emplace_back() with number"
 
Complexity
 
Amortized constant.
 
Examples
 
 Example 
The example shows how emplace_back() can be used to add elements to a JSON array. Note how the null value was silently converted to a JSON array.
 
#include <iostream>
 #include <nlohmann/json.hpp>
@@ -28,4 +28,4 @@
 null
 [1,2,3,4,5,6]
 ["first",["second","second","second"]]
-
 
 
See also
  
Version history
 
     
  • Since version 2.0.8.
    •  
  • Returns reference since 3.7.0.
    •  
   
 
   
  
 
 
 
 
 
 Copyright © 2013-2025 Niels Lohmann 
 
 
             
 
 
 
 
 
 
 
     
\ No newline at end of file
+

See also

Version history

  • Since version 2.0.8.
  • Returns reference since 3.7.0.
Copyright © 2013-2025 Niels Lohmann
\ No newline at end of file diff --git a/api/basic_json/empty/index.html b/api/basic_json/empty/index.html index edd9145b8..7d0888e76 100644 --- a/api/basic_json/empty/index.html +++ b/api/basic_json/empty/index.html @@ -1,4 +1,4 @@ - empty - JSON for Modern C++
Skip to content

nlohmann::basic_json::empty

bool empty() const noexcept;
+ empty - JSON for Modern C++      
 
 
  
 
  
 
 
 
 
  
 
 
 
 
 
  
 
 
 
 
       
nlohmann::basic_json::empty
 
bool empty() const noexcept;
 
 
Checks if a JSON value has no elements (i.e., whether its size() is 0).
 
Return value
 
The return value depends on the different types and is defined as follows:
 
  
 Value type return value 
   
 null true 
 
 boolean false 
 
 string false 
 
 number false 
 
 binary false 
 
 object result of function object_t::empty() 
 
 array result of function array_t::empty() 
  
 
Exception safety
 
No-throw guarantee: this function never throws exceptions.
 
Complexity
 
Constant, as long as array_t and object_t satisfy the Container concept; that is, their empty() functions have constant complexity.
 
Possible implementation
 
bool empty() const noexcept
 {
     return size() == 0;
@@ -42,4 +42,4 @@
 false
 true
 false
-
  
Version history
 
     
  • Added in version 1.0.0.
    •  
  • Extended to return false for binary types in version 3.8.0.
    •  
   
 
   
  
 
 
 
 
 
 Copyright © 2013-2025 Niels Lohmann 
 
 
             
 
 
 
 
 
 
 
     
\ No newline at end of file
+

Version history

  • Added in version 1.0.0.
  • Extended to return false for binary types in version 3.8.0.
Copyright © 2013-2025 Niels Lohmann
\ No newline at end of file diff --git a/api/basic_json/end/index.html b/api/basic_json/end/index.html index 331610505..518f2f7cb 100644 --- a/api/basic_json/end/index.html +++ b/api/basic_json/end/index.html @@ -1,4 +1,4 @@ - end - JSON for Modern C++
Skip to content

nlohmann::basic_json::end

iterator end() noexcept;
+ end - JSON for Modern C++      
 
 
  
 
  
 
 
 
 
  
 
 
 
 
 
  
 
 
 
 
       
nlohmann::basic_json::end
 
iterator end() noexcept;
 const_iterator end() const noexcept;
 
 
Returns an iterator to one past the last element.
 
Illustration from cppreference.com
 
Return value
 
iterator one past the last element
 
Exception safety
 
No-throw guarantee: this member function never throws exceptions.
 
Complexity
 
Constant.
 
Examples
 
 Example 
The following code shows an example for end().
 
#include <iostream>
 #include <nlohmann/json.hpp>
@@ -20,4 +20,4 @@
     std::cout << *it << '\n';
 }
 
 
Output:
 
5
-
 
 
Version history
 
     
  • Added in version 1.0.0.
    •  
   
 
   
  
 
 
 
 
 
 Copyright © 2013-2025 Niels Lohmann 
 
 
             
 
 
 
 
 
 
 
     
\ No newline at end of file
+

Version history

  • Added in version 1.0.0.
Copyright © 2013-2025 Niels Lohmann
\ No newline at end of file diff --git a/api/basic_json/end_pos/index.html b/api/basic_json/end_pos/index.html index 70d26b539..e5e80293f 100644 --- a/api/basic_json/end_pos/index.html +++ b/api/basic_json/end_pos/index.html @@ -1,4 +1,4 @@ - end_pos - JSON for Modern C++
Skip to content

nlohmann::basic_json::end_pos

#if JSON_DIAGNOSTIC_POSITIONS
+ end_pos - JSON for Modern C++      
 
 
  
 
  
 
 
 
 
  
 
 
 
 
 
  
 
 
 
 
       
nlohmann::basic_json::end_pos
 
#if JSON_DIAGNOSTIC_POSITIONS
 constexpr std::size_t end_pos() const noexcept;
 #endif
 
 
Returns the position immediately following the last character of the JSON string from which the value was parsed from.
 
  
 JSON type return value 
   
 object position after the closing } 
 
 array position after the closing ] 
 
 string position after the closing " 
 
 number position after the last character 
 
 boolean position after e 
 
 null position after l 
  
 
Return value
 
the position of the character following the last character of the given value in the parsed JSON string, if the value was created by the parse function, or std::string::npos if the value was constructed otherwise
 
Exception safety
 
No-throw guarantee: this member function never throws exceptions.
 
Complexity
 
Constant.
 
Notes
 
 
Note
 
The function is only available if macro JSON_DIAGNOSTIC_POSITIONS has been defined to 1 before including the library header.
 
 
 
Invalidation
 
The returned positions are only valid as long as the JSON value is not changed. The positions are not updated when the JSON value is changed.
 
 
Examples
 
 Example 
#include <iostream>
@@ -101,4 +101,4 @@ Original string:
 1
 Parsed string: 
 1
-
 
The output shows the start/end positions of all the objects and fields in the JSON string.
 
 
See also
  
Version history
 
     
  • Added in version 3.12.0.
    •  
   
 
   
  
 
 
 
 
 
 Copyright © 2013-2025 Niels Lohmann 
 
 
             
 
 
 
 
 
 
 
     
\ No newline at end of file
+

The output shows the start/end positions of all the objects and fields in the JSON string.

See also

Version history

  • Added in version 3.12.0.
Copyright © 2013-2025 Niels Lohmann
\ No newline at end of file diff --git a/api/basic_json/erase/index.html b/api/basic_json/erase/index.html index 012540ea4..3bf67321a 100644 --- a/api/basic_json/erase/index.html +++ b/api/basic_json/erase/index.html @@ -1,4 +1,4 @@ - erase - JSON for Modern C++
Skip to content

nlohmann::basic_json::erase

// (1)
+ erase - JSON for Modern C++      
 
 
  
 
  
 
 
 
 
  
 
 
 
 
 
  
 
 
 
 
       
nlohmann::basic_json::erase
 
// (1)
 iterator erase(iterator pos);
 const_iterator erase(const_iterator pos);
 
@@ -148,4 +148,4 @@
     std::cout << j_array << '\n';
 }
 
 
Output:
 
[0,1,3,4,5]
-
  
Version history
 
     
  1. Added in version 1.0.0. Added support for binary types in version 3.8.0.
    2.  
  2. Added in version 1.0.0. Added support for binary types in version 3.8.0.
    3.  
  3. Added in version 1.0.0.
    4.  
  4. Added in version 3.11.0.
    5.  
  5. Added in version 1.0.0.
    6.  
   
 
   
  
 
 
 
 
 
 Copyright © 2013-2025 Niels Lohmann 
 
 
             
 
 
 
 
 
 
 
     
\ No newline at end of file
+

Version history

  1. Added in version 1.0.0. Added support for binary types in version 3.8.0.
  2. Added in version 1.0.0. Added support for binary types in version 3.8.0.
  3. Added in version 1.0.0.
  4. Added in version 3.11.0.
  5. Added in version 1.0.0.
Copyright © 2013-2025 Niels Lohmann
\ No newline at end of file diff --git a/api/basic_json/error_handler_t/index.html b/api/basic_json/error_handler_t/index.html index 1f6c42cb5..9bd487749 100644 --- a/api/basic_json/error_handler_t/index.html +++ b/api/basic_json/error_handler_t/index.html @@ -1,4 +1,4 @@ - error_handler_t - JSON for Modern C++
Skip to content

nlohmann::basic_json::error_handler_t

enum class error_handler_t {
+ error_handler_t - JSON for Modern C++      
 
 
  
 
  
 
 
 
 
  
 
 
 
 
 
  
 
 
 
 
       
nlohmann::basic_json::error_handler_t
 
enum class error_handler_t {
     strict,
     replace,
     ignore
@@ -30,4 +30,4 @@
 
 
Output:
 
[json.exception.type_error.316] invalid UTF-8 byte at index 2: 0xA9
 string with replaced invalid characters: "ä�ü"
 string with ignored invalid characters: "äü"
-
  
Version history
 
     
  • Added in version 3.4.0.
    •  
   
 
   
  
 
 
 
 
 
 Copyright © 2013-2025 Niels Lohmann 
 
 
             
 
 
 
 
 
 
 
     
\ No newline at end of file
+

Version history

  • Added in version 3.4.0.
Copyright © 2013-2025 Niels Lohmann
\ No newline at end of file diff --git a/api/basic_json/exception/index.html b/api/basic_json/exception/index.html index 5bce918c7..21e1f6e64 100644 --- a/api/basic_json/exception/index.html +++ b/api/basic_json/exception/index.html @@ -1,4 +1,4 @@ - exception - JSON for Modern C++
Skip to content

nlohmann::basic_json::exception

class exception : public std::exception;
+ exception - JSON for Modern C++      
 
 
  
 
  
 
 
 
 
  
 
 
 
 
 
  
 
 
 
 
       
nlohmann::basic_json::exception
 
class exception : public std::exception;
 
 
This class is an extension of std::exception objects with a member id for exception ids. It is used as the base class for all exceptions thrown by the basic_json class. This class can hence be used as "wildcard" to catch exceptions, see example below.
 
classDiagram
   direction LR
 
@@ -49,4 +49,4 @@
 }
 
 
Output:
 
message: [json.exception.out_of_range.403] key 'non-existing' not found
 exception id: 403
-
  
See also
 
List of exceptions
 
Version history
 
     
  • Since version 3.0.0.
    •
Copyright © 2013-2025 Niels Lohmann
\ No newline at end of file +

See also

List of exceptions

Version history

\ No newline at end of file diff --git a/api/basic_json/find/index.html b/api/basic_json/find/index.html index 031604ff0..e70d9a65f 100644 --- a/api/basic_json/find/index.html +++ b/api/basic_json/find/index.html @@ -1,4 +1,4 @@ - find - JSON for Modern C++
Skip to content

nlohmann::basic_json::find

// (1)
+ find - JSON for Modern C++      
 
 
  
 
  
 
 
 
 
  
 
 
 
 
 
  
 
 
 
 
       
nlohmann::basic_json::find
 
// (1)
 iterator find(const typename object_t::key_type& key);
 const_iterator find(const typename object_t::key_type& key) const;
 
@@ -55,4 +55,4 @@
 
 
Output:
 
"two" was found: true
 value at key "two": 2
 "three" was found: false
-
  
See also
  
Version history
 
     
  1. Added in version 3.11.0.
    2.  
  2. Added in version 1.0.0. Changed to support comparable types in version 3.11.0.
    3.  
   
 
   
  
 
 
 
 
 
 Copyright © 2013-2025 Niels Lohmann 
 
 
             
 
 
 
 
 
 
 
     
\ No newline at end of file
+

See also

Version history

  1. Added in version 3.11.0.
  2. Added in version 1.0.0. Changed to support comparable types in version 3.11.0.
Copyright © 2013-2025 Niels Lohmann
\ No newline at end of file diff --git a/api/basic_json/flatten/index.html b/api/basic_json/flatten/index.html index 33459710d..8f6662b18 100644 --- a/api/basic_json/flatten/index.html +++ b/api/basic_json/flatten/index.html @@ -1,4 +1,4 @@ - flatten - JSON for Modern C++
Skip to content

nlohmann::basic_json::flatten

basic_json flatten() const;
+ flatten - JSON for Modern C++      
 
 
  
 
  
 
 
 
 
  
 
 
 
 
 
  
 
 
 
 
       
nlohmann::basic_json::flatten
 
basic_json flatten() const;
 
 
The function creates a JSON object whose keys are JSON pointers (see RFC 6901) and whose values are all primitive (see is_primitive() for more information). The original JSON value can be restored using the unflatten() function.
 
Return value
 
an object that maps JSON pointers to primitive values
 
Exception safety
 
Strong exception safety: if an exception occurs, the original value stays intact.
 
Complexity
 
Linear in the size of the JSON value.
 
Notes
 
Empty objects and arrays are flattened to null and will not be reconstructed correctly by the unflatten() function.
 
Examples
 
 Example 
The following code shows how a JSON object is flattened to an object whose keys consist of JSON pointers.
 
#include <iostream>
 #include <iomanip>
 #include <nlohmann/json.hpp>
@@ -43,4 +43,4 @@
     "/object/value": 42.99,
     "/pi": 3.141
 }
-
 
 
See also
  
Version history
 
     
  • Added in version 2.0.0.
    •  
   
 
   
  
 
 
 
 
 
 Copyright © 2013-2025 Niels Lohmann 
 
 
             
 
 
 
 
 
 
 
     
\ No newline at end of file
+

See also

Version history

  • Added in version 2.0.0.
Copyright © 2013-2025 Niels Lohmann
\ No newline at end of file diff --git a/api/basic_json/from_bjdata/index.html b/api/basic_json/from_bjdata/index.html index 0f1603e8c..287d00e07 100644 --- a/api/basic_json/from_bjdata/index.html +++ b/api/basic_json/from_bjdata/index.html @@ -1,4 +1,4 @@ - from_bjdata - JSON for Modern C++
Skip to content

nlohmann::basic_json::from_bjdata

// (1)
+ from_bjdata - JSON for Modern C++      
 
 
  
 
  
 
 
 
 
  
 
 
 
 
 
  
 
 
 
 
       
nlohmann::basic_json::from_bjdata
 
// (1)
 template<typename InputType>
 static basic_json from_bjdata(InputType&& i,
                               const bool strict = true,
@@ -32,4 +32,4 @@
   "compact": true,
   "schema": 0
 }
-
  
Version history
 
     
  • Added in version 3.11.0.
    •  
   
 
   
  
 
 
 
 
 
 Copyright © 2013-2025 Niels Lohmann 
 
 
             
 
 
 
 
 
 
 
     
\ No newline at end of file
+

Version history

  • Added in version 3.11.0.
Copyright © 2013-2025 Niels Lohmann
\ No newline at end of file diff --git a/api/basic_json/from_bson/index.html b/api/basic_json/from_bson/index.html index b1c4f4ee9..43a7bb73a 100644 --- a/api/basic_json/from_bson/index.html +++ b/api/basic_json/from_bson/index.html @@ -1,4 +1,4 @@ - from_bson - JSON for Modern C++
Skip to content

nlohmann::basic_json::from_bson

// (1)
+ from_bson - JSON for Modern C++      
 
 
  
 
  
 
 
 
 
  
 
 
 
 
 
  
 
 
 
 
       
nlohmann::basic_json::from_bson
 
// (1)
 template<typename InputType>
 static basic_json from_bson(InputType&& i,
                             const bool strict = true,
@@ -33,4 +33,4 @@
   "compact": true,
   "schema": 0
 }
-
  
See also
  
Version history
 
     
  • Added in version 3.4.0.
    •  
 
 
Deprecation
 
     
  • Overload (2) replaces calls to from_bson with a pointer and a length as first two parameters, which has been deprecated in version 3.8.0. This overload will be removed in version 4.0.0. Please replace all calls like from_bson(ptr, len, ...); with from_bson(ptr, ptr+len, ...);.
    •  
  • Overload (2) replaces calls to from_bson with a pair of iterators as their first parameter, which has been deprecated in version 3.8.0. This overload will be removed in version 4.0.0. Please replace all calls like from_bson({ptr, ptr+len}, ...); with from_bson(ptr, ptr+len, ...);.
    •  
 
You should be warned by your compiler with a -Wdeprecated-declarations warning if you are using a deprecated function.
 
   
 
   
  
 
 
 
 
 
 Copyright © 2013-2025 Niels Lohmann 
 
 
             
 
 
 
 
 
 
 
     
\ No newline at end of file
+

See also

Version history

  • Added in version 3.4.0.

Deprecation

  • Overload (2) replaces calls to from_bson with a pointer and a length as first two parameters, which has been deprecated in version 3.8.0. This overload will be removed in version 4.0.0. Please replace all calls like from_bson(ptr, len, ...); with from_bson(ptr, ptr+len, ...);.
  • Overload (2) replaces calls to from_bson with a pair of iterators as their first parameter, which has been deprecated in version 3.8.0. This overload will be removed in version 4.0.0. Please replace all calls like from_bson({ptr, ptr+len}, ...); with from_bson(ptr, ptr+len, ...);.

You should be warned by your compiler with a -Wdeprecated-declarations warning if you are using a deprecated function.

Copyright © 2013-2025 Niels Lohmann
\ No newline at end of file diff --git a/api/basic_json/from_cbor/index.html b/api/basic_json/from_cbor/index.html index ee0c327a3..8deb26298 100644 --- a/api/basic_json/from_cbor/index.html +++ b/api/basic_json/from_cbor/index.html @@ -1,4 +1,4 @@ - from_cbor - JSON for Modern C++
Skip to content

nlohmann::basic_json::from_cbor

// (1)
+ from_cbor - JSON for Modern C++      
 
 
  
 
  
 
 
 
 
  
 
 
 
 
 
  
 
 
 
 
       
nlohmann::basic_json::from_cbor
 
// (1)
 template<typename InputType>
 static basic_json from_cbor(InputType&& i,
                             const bool strict = true,
@@ -35,4 +35,4 @@
   "compact": true,
   "schema": 0
 }
-
  
Version history
 
     
  • Added in version 2.0.9.
    •  
  • Parameter start_index since version 2.1.1.
    •  
  • Changed to consume input adapters, removed start_index parameter, and added strict parameter in version 3.0.0.
    •  
  • Added allow_exceptions parameter in version 3.2.0.
    •  
  • Added tag_handler parameter in version 3.9.0.
    •  
 
 
Deprecation
 
     
  • Overload (2) replaces calls to from_cbor with a pointer and a length as first two parameters, which has been deprecated in version 3.8.0. This overload will be removed in version 4.0.0. Please replace all calls like from_cbor(ptr, len, ...); with from_cbor(ptr, ptr+len, ...);.
    •  
  • Overload (2) replaces calls to from_cbor with a pair of iterators as their first parameter, which has been deprecated in version 3.8.0. This overload will be removed in version 4.0.0. Please replace all calls like from_cbor({ptr, ptr+len}, ...); with from_cbor(ptr, ptr+len, ...);.
    •  
 
You should be warned by your compiler with a -Wdeprecated-declarations warning if you are using a deprecated function.
 
   
 
   
  
 
 
 
 
 
 Copyright © 2013-2025 Niels Lohmann 
 
 
             
 
 
 
 
 
 
 
     
\ No newline at end of file
+

Version history

  • Added in version 2.0.9.
  • Parameter start_index since version 2.1.1.
  • Changed to consume input adapters, removed start_index parameter, and added strict parameter in version 3.0.0.
  • Added allow_exceptions parameter in version 3.2.0.
  • Added tag_handler parameter in version 3.9.0.

Deprecation

  • Overload (2) replaces calls to from_cbor with a pointer and a length as first two parameters, which has been deprecated in version 3.8.0. This overload will be removed in version 4.0.0. Please replace all calls like from_cbor(ptr, len, ...); with from_cbor(ptr, ptr+len, ...);.
  • Overload (2) replaces calls to from_cbor with a pair of iterators as their first parameter, which has been deprecated in version 3.8.0. This overload will be removed in version 4.0.0. Please replace all calls like from_cbor({ptr, ptr+len}, ...); with from_cbor(ptr, ptr+len, ...);.

You should be warned by your compiler with a -Wdeprecated-declarations warning if you are using a deprecated function.

Copyright © 2013-2025 Niels Lohmann
\ No newline at end of file diff --git a/api/basic_json/from_msgpack/index.html b/api/basic_json/from_msgpack/index.html index a460ac2c7..4fa8d6ee9 100644 --- a/api/basic_json/from_msgpack/index.html +++ b/api/basic_json/from_msgpack/index.html @@ -1,4 +1,4 @@ - from_msgpack - JSON for Modern C++
Skip to content

nlohmann::basic_json::from_msgpack

// (1)
+ from_msgpack - JSON for Modern C++      
 
 
  
 
  
 
 
 
 
  
 
 
 
 
 
  
 
 
 
 
       
nlohmann::basic_json::from_msgpack
 
// (1)
 template<typename InputType>
 static basic_json from_msgpack(InputType&& i,
                                const bool strict = true,
@@ -32,4 +32,4 @@
   "compact": true,
   "schema": 0
 }
-
  
Version history
 
     
  • Added in version 2.0.9.
    •  
  • Parameter start_index since version 2.1.1.
    •  
  • Changed to consume input adapters, removed start_index parameter, and added strict parameter in version 3.0.0.
    •  
  • Added allow_exceptions parameter in version 3.2.0.
    •  
 
 
Deprecation
 
     
  • Overload (2) replaces calls to from_msgpack with a pointer and a length as first two parameters, which has been deprecated in version 3.8.0. This overload will be removed in version 4.0.0. Please replace all calls like from_msgpack(ptr, len, ...); with from_msgpack(ptr, ptr+len, ...);.
    •  
  • Overload (2) replaces calls to from_cbor with a pair of iterators as their first parameter, which has been deprecated in version 3.8.0. This overload will be removed in version 4.0.0. Please replace all calls like from_msgpack({ptr, ptr+len}, ...); with from_msgpack(ptr, ptr+len, ...);.
    •  
 
You should be warned by your compiler with a -Wdeprecated-declarations warning if you are using a deprecated function.
 
   
 
   
  
 
 
 
 
 
 Copyright © 2013-2025 Niels Lohmann 
 
 
             
 
 
 
 
 
 
 
     
\ No newline at end of file
+

Version history

  • Added in version 2.0.9.
  • Parameter start_index since version 2.1.1.
  • Changed to consume input adapters, removed start_index parameter, and added strict parameter in version 3.0.0.
  • Added allow_exceptions parameter in version 3.2.0.

Deprecation

  • Overload (2) replaces calls to from_msgpack with a pointer and a length as first two parameters, which has been deprecated in version 3.8.0. This overload will be removed in version 4.0.0. Please replace all calls like from_msgpack(ptr, len, ...); with from_msgpack(ptr, ptr+len, ...);.
  • Overload (2) replaces calls to from_cbor with a pair of iterators as their first parameter, which has been deprecated in version 3.8.0. This overload will be removed in version 4.0.0. Please replace all calls like from_msgpack({ptr, ptr+len}, ...); with from_msgpack(ptr, ptr+len, ...);.

You should be warned by your compiler with a -Wdeprecated-declarations warning if you are using a deprecated function.

Copyright © 2013-2025 Niels Lohmann
\ No newline at end of file diff --git a/api/basic_json/from_ubjson/index.html b/api/basic_json/from_ubjson/index.html index 174043fa5..eff173641 100644 --- a/api/basic_json/from_ubjson/index.html +++ b/api/basic_json/from_ubjson/index.html @@ -1,4 +1,4 @@ - from_ubjson - JSON for Modern C++
Skip to content

nlohmann::basic_json::from_ubjson

// (1)
+ from_ubjson - JSON for Modern C++      
 
 
  
 
  
 
 
 
 
  
 
 
 
 
 
  
 
 
 
 
       
nlohmann::basic_json::from_ubjson
 
// (1)
 template<typename InputType>
 static basic_json from_ubjson(InputType&& i,
                               const bool strict = true,
@@ -32,4 +32,4 @@
   "compact": true,
   "schema": 0
 }
-
  
Version history
 
     
  • Added in version 3.1.0.
    •  
  • Added allow_exceptions parameter in version 3.2.0.
    •  
 
 
Deprecation
 
     
  • Overload (2) replaces calls to from_ubjson with a pointer and a length as first two parameters, which has been deprecated in version 3.8.0. This overload will be removed in version 4.0.0. Please replace all calls like from_ubjson(ptr, len, ...); with from_ubjson(ptr, ptr+len, ...);.
    •  
  • Overload (2) replaces calls to from_ubjson with a pair of iterators as their first parameter, which has been deprecated in version 3.8.0. This overload will be removed in version 4.0.0. Please replace all calls like from_ubjson({ptr, ptr+len}, ...); with from_ubjson(ptr, ptr+len, ...);.
    •  
 
You should be warned by your compiler with a -Wdeprecated-declarations warning if you are using a deprecated function.
 
   
 
   
  
 
 
 
 
 
 Copyright © 2013-2025 Niels Lohmann 
 
 
             
 
 
 
 
 
 
 
     
\ No newline at end of file
+

Version history

  • Added in version 3.1.0.
  • Added allow_exceptions parameter in version 3.2.0.

Deprecation

  • Overload (2) replaces calls to from_ubjson with a pointer and a length as first two parameters, which has been deprecated in version 3.8.0. This overload will be removed in version 4.0.0. Please replace all calls like from_ubjson(ptr, len, ...); with from_ubjson(ptr, ptr+len, ...);.
  • Overload (2) replaces calls to from_ubjson with a pair of iterators as their first parameter, which has been deprecated in version 3.8.0. This overload will be removed in version 4.0.0. Please replace all calls like from_ubjson({ptr, ptr+len}, ...); with from_ubjson(ptr, ptr+len, ...);.

You should be warned by your compiler with a -Wdeprecated-declarations warning if you are using a deprecated function.

Copyright © 2013-2025 Niels Lohmann
\ No newline at end of file diff --git a/api/basic_json/front/index.html b/api/basic_json/front/index.html index 6f32060f6..fe2588f9d 100644 --- a/api/basic_json/front/index.html +++ b/api/basic_json/front/index.html @@ -1,4 +1,4 @@ - front - JSON for Modern C++
Skip to content

nlohmann::basic_json::front

reference front();
+ front - JSON for Modern C++      
 
 
  
 
  
 
 
 
 
  
 
 
 
 
 
  
 
 
 
 
       
nlohmann::basic_json::front
 
reference front();
 const_reference front() const;
 
 
Returns a reference to the first element in the container. For a JSON container c, the expression c.front() is equivalent to *c.begin().
 
Return value
 
In the case of a structured type (array or object), a reference to the first element is returned. In the case of number, string, boolean, or binary values, a reference to the value is returned.
 
Exception safety
 
Strong guarantee: if an exception is thrown, there are no changes in the JSON value.
 
Exceptions
 
If the JSON value is null, exception invalid_iterator.214 is thrown.
 
Complexity
 
Constant.
 
Notes
 
 
Precondition
 
The array or object must not be empty. Calling front on an empty array or object yields undefined behavior.
 
 
Examples
 
 Example 
The following code shows an example for front().
 
#include <iostream>
 #include <nlohmann/json.hpp>
@@ -35,4 +35,4 @@
 1
 1
 "Hello, world"
-
 
 
See also
 
     
  • back to access the last element
    •  
 
Version history
 
     
  • Added in version 1.0.0.
    •  
  • Adjusted code to return reference to binary values in version 3.8.0.
    •  
   
 
   
  
 
 
 
 
 
 Copyright © 2013-2025 Niels Lohmann 
 
 
             
 
 
 
 
 
 
 
     
\ No newline at end of file
+

See also

  • back to access the last element

Version history

  • Added in version 1.0.0.
  • Adjusted code to return reference to binary values in version 3.8.0.
Copyright © 2013-2025 Niels Lohmann
\ No newline at end of file diff --git a/api/basic_json/get/index.html b/api/basic_json/get/index.html index 5762ed995..0c256196c 100644 --- a/api/basic_json/get/index.html +++ b/api/basic_json/get/index.html @@ -1,4 +1,4 @@ - get - JSON for Modern C++
Skip to content

nlohmann::basic_json::get

// (1)
+ get - JSON for Modern C++      
 
 
  
 
  
 
 
 
 
  
 
 
 
 
 
  
 
 
 
 
       
nlohmann::basic_json::get
 
// (1)
 template<typename ValueType>
 ValueType get() const noexcept(
     noexcept(JSONSerializer<ValueType>::from_json(
@@ -103,4 +103,4 @@
 }
 
 
Output:
 
17 17 17 17
 true
-
  
Version history
 
     
  1. Since version 2.1.0.
    2.  
  2. Since version 2.1.0. Extended to work with other specializations of basic_json in version 3.2.0.
    3.  
  3. Since version 1.0.0.
    4.  
   
 
   
  
 
 
 
 
 
 Copyright © 2013-2025 Niels Lohmann 
 
 
             
 
 
 
 
 
 
 
     
\ No newline at end of file
+

Version history

  1. Since version 2.1.0.
  2. Since version 2.1.0. Extended to work with other specializations of basic_json in version 3.2.0.
  3. Since version 1.0.0.
Copyright © 2013-2025 Niels Lohmann
\ No newline at end of file diff --git a/api/basic_json/get_allocator/index.html b/api/basic_json/get_allocator/index.html index 8c96b7662..6a05c8dcc 100644 --- a/api/basic_json/get_allocator/index.html +++ b/api/basic_json/get_allocator/index.html @@ -1,4 +1,4 @@ - get_allocator - JSON for Modern C++
Skip to content

nlohmann::basic_json::get_allocator

static allocator_type get_allocator();
+ get_allocator - JSON for Modern C++      
 
 
  
 
  
 
 
 
 
  
 
 
 
 
 
  
 
 
 
 
       
nlohmann::basic_json::get_allocator
 
static allocator_type get_allocator();
 
 
Returns the allocator associated with the container.
 
Return value
 
associated allocator
 
Examples
 
 Example 
The example shows how get_allocator() is used to created json values.
 
#include <iostream>
 #include <nlohmann/json.hpp>
 
@@ -18,4 +18,4 @@
     traits_t::deallocate(alloc, j, 1);
 }
 
 
Output:
 
"Hello, world!"
-
 
 
Version history
 
     
  • Added in version 1.0.0.
    •  
   
 
   
  
 
 
 
 
 
 Copyright © 2013-2025 Niels Lohmann 
 
 
             
 
 
 
 
 
 
 
     
\ No newline at end of file
+

Version history

  • Added in version 1.0.0.
Copyright © 2013-2025 Niels Lohmann
\ No newline at end of file diff --git a/api/basic_json/get_binary/index.html b/api/basic_json/get_binary/index.html index a53b76304..12474c6db 100644 --- a/api/basic_json/get_binary/index.html +++ b/api/basic_json/get_binary/index.html @@ -1,4 +1,4 @@ - get_binary - JSON for Modern C++
Skip to content

nlohmann::basic_json::get_binary

binary_t& get_binary();
+ get_binary - JSON for Modern C++      
 
 
  
 
  
 
 
 
 
  
 
 
 
 
 
  
 
 
 
 
       
nlohmann::basic_json::get_binary
 
binary_t& get_binary();
 
 const binary_t& get_binary() const;
 
 
Returns a reference to the stored binary value.
 
Return value
 
Reference to binary value.
 
Exception safety
 
Strong exception safety: if an exception occurs, the original value stays intact.
 
Exceptions
 
Throws type_error.302 if the value is not binary
 
Complexity
 
Constant.
 
Examples
 
 Example 
The following code shows how to query a binary value.
 
#include <iostream>
@@ -18,4 +18,4 @@
     std::cout << "type: " << j.type_name() << ", subtype: " << j.get_binary().subtype() << std::endl;
 }
 
 
Output:
 
type: binary, subtype: 42
-
 
 
Version history
 
     
  • Added in version 3.8.0.
    •  
   
 
   
  
 
 
 
 
 
 Copyright © 2013-2025 Niels Lohmann 
 
 
             
 
 
 
 
 
 
 
     
\ No newline at end of file
+

Version history

  • Added in version 3.8.0.
Copyright © 2013-2025 Niels Lohmann
\ No newline at end of file diff --git a/api/basic_json/get_ptr/index.html b/api/basic_json/get_ptr/index.html index 9b2a6ec09..e419e6599 100644 --- a/api/basic_json/get_ptr/index.html +++ b/api/basic_json/get_ptr/index.html @@ -1,4 +1,4 @@ - get_ptr - JSON for Modern C++
Skip to content

nlohmann::basic_json::get_ptr

template<typename PointerType>
+ get_ptr - JSON for Modern C++      
 
 
  
 
  
 
 
 
 
  
 
 
 
 
 
  
 
 
 
 
       
nlohmann::basic_json::get_ptr
 
template<typename PointerType>
 PointerType get_ptr() noexcept;
 
 template<typename PointerType>
@@ -44,4 +44,4 @@ value at 0x6000029fc088 is 1
 }
 
 
Output:
 
17 17 17 17
 true
-
  
See also
  
Version history
 
     
  • Added in version 1.0.0.
    •  
  • Extended to binary types in version 3.8.0.
    •  
   
 
   
  
 
 
 
 
 
 Copyright © 2013-2025 Niels Lohmann 
 
 
             
 
 
 
 
 
 
 
     
\ No newline at end of file
+

See also

Version history

  • Added in version 1.0.0.
  • Extended to binary types in version 3.8.0.
Copyright © 2013-2025 Niels Lohmann
\ No newline at end of file diff --git a/api/basic_json/get_ref/index.html b/api/basic_json/get_ref/index.html index d5caa485c..de4bdd948 100644 --- a/api/basic_json/get_ref/index.html +++ b/api/basic_json/get_ref/index.html @@ -1,4 +1,4 @@ - get_ref - JSON for Modern C++
Skip to content

nlohmann::basic_json::get_ref

template<typename ReferenceType>
+ get_ref - JSON for Modern C++      
 
 
  
 
  
 
 
 
 
  
 
 
 
 
 
  
 
 
 
 
       
nlohmann::basic_json::get_ref
 
template<typename ReferenceType>
 ReferenceType get_ref();
 
 template<typename ReferenceType>
@@ -32,4 +32,4 @@
 }
 
 
Output:
 
17 17
 [json.exception.type_error.303] incompatible ReferenceType for get_ref, actual type is number
-
  
See also
  
Version history
 
     
  • Added in version 1.1.0.
    •  
  • Extended to binary types in version 3.8.0.
    •  
   
 
   
  
 
 
 
 
 
 Copyright © 2013-2025 Niels Lohmann 
 
 
             
 
 
 
 
 
 
 
     
\ No newline at end of file
+

See also

Version history

  • Added in version 1.1.0.
  • Extended to binary types in version 3.8.0.
Copyright © 2013-2025 Niels Lohmann
\ No newline at end of file diff --git a/api/basic_json/get_to/index.html b/api/basic_json/get_to/index.html index 357730d7f..36676574f 100644 --- a/api/basic_json/get_to/index.html +++ b/api/basic_json/get_to/index.html @@ -1,4 +1,4 @@ - get_to - JSON for Modern C++
Skip to content

nlohmann::basic_json::get_to

template<typename ValueType>
+ get_to - JSON for Modern C++      
 
 
  
 
  
 
 
 
 
  
 
 
 
 
 
  
 
 
 
 
       
nlohmann::basic_json::get_to
 
template<typename ValueType>
 ValueType& get_to(ValueType& v) const noexcept(
     noexcept(JSONSerializer<ValueType>::from_json(
         std::declval<const basic_json_t&>(), v)));
@@ -74,4 +74,4 @@
 null: null
 boolean: true
 array: [1,2,3,4,5]
-
  
Version history
 
     
  • Since version 3.3.0.
    •  
   
 
   
  
 
 
 
 
 
 Copyright © 2013-2025 Niels Lohmann 
 
 
             
 
 
 
 
 
 
 
     
\ No newline at end of file
+

Version history

  • Since version 3.3.0.
Copyright © 2013-2025 Niels Lohmann
\ No newline at end of file diff --git a/api/basic_json/index.html b/api/basic_json/index.html index ff16a7a44..befee76ce 100644 --- a/api/basic_json/index.html +++ b/api/basic_json/index.html @@ -1,4 +1,4 @@ - Overview - JSON for Modern C++
Skip to content

nlohmann::basic_json

Defined in header <nlohmann/json.hpp>

template<
+ Overview - JSON for Modern C++      
 
 
  
 
  
 
 
 
 
  
 
 
 
 
 
  
 
 
 
 
       
nlohmann::basic_json
 
Defined in header <nlohmann/json.hpp>
 
template<
     template<typename U, typename V, typename... Args> class ObjectType = std::map,
     template<typename U, typename... Args> class ArrayType = std::vector,
     class StringType = std::string,
@@ -78,4 +78,4 @@
     "pi": 3.141,
     "size": 8
 }
-
  
See also
  
Version history
 
     
  • Added in version 1.0.0.
    •  
   
 
   
  
 
 
 
 
 
 Copyright © 2013-2025 Niels Lohmann 
 
 
             
 
 
 
 
 
 
 
     
\ No newline at end of file
+

See also

Version history

  • Added in version 1.0.0.
Copyright © 2013-2025 Niels Lohmann
\ No newline at end of file diff --git a/api/basic_json/input_format_t/index.html b/api/basic_json/input_format_t/index.html index c5b366058..32b283527 100644 --- a/api/basic_json/input_format_t/index.html +++ b/api/basic_json/input_format_t/index.html @@ -1,4 +1,4 @@ - input_format_t - JSON for Modern C++
Skip to content

nlohmann::basic_json::input_format_t

enum class input_format_t {
+ input_format_t - JSON for Modern C++      
 
 
  
 
  
 
 
 
 
  
 
 
 
 
 
  
 
 
 
 
       
nlohmann::basic_json::input_format_t
 
enum class input_format_t {
     json,
     cbor,
     msgpack,
@@ -123,4 +123,4 @@
 
 
Output:
 
binary(val=[...])
 
 result: true
-
  
Version history
 
     
  • Added in version 3.2.0.
    •  
   
 
   
  
 
 
 
 
 
 Copyright © 2013-2025 Niels Lohmann 
 
 
             
 
 
 
 
 
 
 
     
\ No newline at end of file
+

Version history

  • Added in version 3.2.0.
Copyright © 2013-2025 Niels Lohmann
\ No newline at end of file diff --git a/api/basic_json/insert/index.html b/api/basic_json/insert/index.html index 6168b66e7..ff47756d0 100644 --- a/api/basic_json/insert/index.html +++ b/api/basic_json/insert/index.html @@ -1,4 +1,4 @@ - insert - JSON for Modern C++
Skip to content

nlohmann::basic_json::insert

// (1)
+ insert - JSON for Modern C++      
 
 
  
 
  
 
 
 
 
  
 
 
 
 
 
  
 
 
 
 
       
nlohmann::basic_json::insert
 
// (1)
 iterator insert(const_iterator pos, const basic_json& val);
 iterator insert(const_iterator pos, basic_json&& val);
 
@@ -116,4 +116,4 @@
 
 
Output:
 
{"one":"eins","two":"zwei"}
 {"eleven":"elf","seventeen":"siebzehn"}
 {"eleven":"elf","one":"eins","seventeen":"siebzehn","two":"zwei"}
-
  
Version history
 
     
  1. Added in version 1.0.0.
    2.  
  2. Added in version 1.0.0.
    3.  
  3. Added in version 1.0.0.
    4.  
  4. Added in version 1.0.0.
    5.  
  5. Added in version 3.0.0.
    6.  
   
 
   
  
 
 
 
 
 
 Copyright © 2013-2025 Niels Lohmann 
 
 
             
 
 
 
 
 
 
 
     
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+

Version history

  1. Added in version 1.0.0.
  2. Added in version 1.0.0.
  3. Added in version 1.0.0.
  4. Added in version 1.0.0.
  5. Added in version 3.0.0.
Copyright © 2013-2025 Niels Lohmann
\ No newline at end of file diff --git a/api/basic_json/invalid_iterator/index.html b/api/basic_json/invalid_iterator/index.html index d06a6a063..5cb7c8295 100644 --- a/api/basic_json/invalid_iterator/index.html +++ b/api/basic_json/invalid_iterator/index.html @@ -1,4 +1,4 @@ - invalid_iterator - JSON for Modern C++
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nlohmann::basic_json::invalid_iterator

class invalid_iterator : public exception;
+ invalid_iterator - JSON for Modern C++      
 
 
  
 
  
 
 
 
 
  
 
 
 
 
 
  
 
 
 
 
       
nlohmann::basic_json::invalid_iterator
 
class invalid_iterator : public exception;
 
 
This exception is thrown if iterators passed to a library function do not match the expected semantics.
 
Exceptions have ids 2xx (see list of iterator errors).
 
classDiagram
   direction LR
 
@@ -50,4 +50,4 @@
 }
 
 
Output:
 
message: [json.exception.invalid_iterator.207] cannot use key() for non-object iterators
 exception id: 207
-
  
See also
  
Version history
 
     
  • Since version 3.0.0.
    •
Copyright © 2013-2025 Niels Lohmann
\ No newline at end of file +

See also

Version history

\ No newline at end of file diff --git a/api/basic_json/is_array/index.html b/api/basic_json/is_array/index.html index e64d0eeb3..e5d0827d5 100644 --- a/api/basic_json/is_array/index.html +++ b/api/basic_json/is_array/index.html @@ -1,4 +1,4 @@ - is_array - JSON for Modern C++
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nlohmann::basic_json::is_array

constexpr bool is_array() const noexcept;
+ is_array - JSON for Modern C++      
 
 
  
 
  
 
 
 
 
  
 
 
 
 
 
  
 
 
 
 
       
nlohmann::basic_json::is_array
 
constexpr bool is_array() const noexcept;
 
 
This function returns true if and only if the JSON value is an array.
 
Return value
 
true if type is an array, false otherwise.
 
Exception safety
 
No-throw guarantee: this member function never throws exceptions.
 
Complexity
 
Constant.
 
Examples
 
 Example 
The following code exemplifies is_array() for all JSON types.
 
#include <iostream>
 #include <nlohmann/json.hpp>
 
@@ -38,4 +38,4 @@
 true
 false
 false
-
 
 
Version history
 
     
  • Added in version 1.0.0.
    •  
   
 
   
  
 
 
 
 
 
 Copyright © 2013-2025 Niels Lohmann 
 
 
             
 
 
 
 
 
 
 
     
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Version history

  • Added in version 1.0.0.
Copyright © 2013-2025 Niels Lohmann
\ No newline at end of file diff --git a/api/basic_json/is_binary/index.html b/api/basic_json/is_binary/index.html index e3bc1b0ca..0faa4d1d6 100644 --- a/api/basic_json/is_binary/index.html +++ b/api/basic_json/is_binary/index.html @@ -1,4 +1,4 @@ - is_binary - JSON for Modern C++
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nlohmann::basic_json::is_binary

constexpr bool is_binary() const noexcept;
+ is_binary - JSON for Modern C++      
 
 
  
 
  
 
 
 
 
  
 
 
 
 
 
  
 
 
 
 
       
nlohmann::basic_json::is_binary
 
constexpr bool is_binary() const noexcept;
 
 
This function returns true if and only if the JSON value is a binary array.
 
Return value
 
true if type is binary, false otherwise.
 
Exception safety
 
No-throw guarantee: this member function never throws exceptions.
 
Complexity
 
Constant.
 
Examples
 
 Example 
The following code exemplifies is_binary() for all JSON types.
 
#include <iostream>
 #include <nlohmann/json.hpp>
 
@@ -38,4 +38,4 @@
 false
 false
 true
-
 
 
Version history
 
     
  • Added in version 3.8.0.
    •  
   
 
   
  
 
 
 
 
 
 Copyright © 2013-2025 Niels Lohmann 
 
 
             
 
 
 
 
 
 
 
     
\ No newline at end of file
+

Version history

  • Added in version 3.8.0.
Copyright © 2013-2025 Niels Lohmann
\ No newline at end of file diff --git a/api/basic_json/is_boolean/index.html b/api/basic_json/is_boolean/index.html index 8dcf6634f..dbed6fc09 100644 --- a/api/basic_json/is_boolean/index.html +++ b/api/basic_json/is_boolean/index.html @@ -1,4 +1,4 @@ - is_boolean - JSON for Modern C++
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nlohmann::basic_json::is_boolean

constexpr bool is_boolean() const noexcept;
+ is_boolean - JSON for Modern C++      
 
 
  
 
  
 
 
 
 
  
 
 
 
 
 
  
 
 
 
 
       
nlohmann::basic_json::is_boolean
 
constexpr bool is_boolean() const noexcept;
 
 
This function returns true if and only if the JSON value is true or false.
 
Return value
 
true if type is boolean, false otherwise.
 
Exception safety
 
No-throw guarantee: this member function never throws exceptions.
 
Complexity
 
Constant.
 
Examples
 
 Example 
The following code exemplifies is_boolean() for all JSON types.
 
#include <iostream>
 #include <nlohmann/json.hpp>
 
@@ -38,4 +38,4 @@
 false
 false
 false
-
 
 
Version history
 
     
  • Added in version 1.0.0.
    •  
   
 
   
  
 
 
 
 
 
 Copyright © 2013-2025 Niels Lohmann 
 
 
             
 
 
 
 
 
 
 
     
\ No newline at end of file
+

Version history

  • Added in version 1.0.0.
Copyright © 2013-2025 Niels Lohmann
\ No newline at end of file diff --git a/api/basic_json/is_discarded/index.html b/api/basic_json/is_discarded/index.html index 82e59ac03..a5ab33542 100644 --- a/api/basic_json/is_discarded/index.html +++ b/api/basic_json/is_discarded/index.html @@ -1,4 +1,4 @@ - is_discarded - JSON for Modern C++
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nlohmann::basic_json::is_discarded

constexpr bool is_discarded() const noexcept;
+ is_discarded - JSON for Modern C++      
 
 
  
 
  
 
 
 
 
  
 
 
 
 
 
  
 
 
 
 
       
nlohmann::basic_json::is_discarded
 
constexpr bool is_discarded() const noexcept;
 
 
This function returns true for a JSON value if either:
 
     
  • the value was discarded during parsing with a callback function (see parser_callback_t), or
    •  
  • the value is the result of parsing invalid JSON with parameter allow_exceptions set to false; see parse for more information.
    •  
 
Return value
 
true if type is discarded, false otherwise.
 
Exception safety
 
No-throw guarantee: this member function never throws exceptions.
 
Complexity
 
Constant.
 
Notes
 
 
Comparisons
 
Discarded values are never compared equal with operator==. That is, checking whether a JSON value j is discarded will only work via:
 
j.is_discarded()
 
 
because
 
j == json::value_t::discarded
 
 
will always be false.
 
 
 
Removal during parsing with callback functions
 
When a value is discarded by a callback function (see parser_callback_t) during parsing, then it is removed when it is part of a structured value. For instance, if the second value of an array is discarded, instead of [null, discarded, false], the array [null, false] is returned. Only if the top-level value is discarded, the return value of the parse call is discarded.
 
 
This function will always be false for JSON values after parsing. That is, discarded values can only occur during parsing, but will be removed when inside a structured value or replaced by null in other cases.
 
Examples
 
 Example 
The following code exemplifies is_discarded() for all JSON types.
 
#include <iostream>
@@ -40,4 +40,4 @@
 false
 false
 false
-
 
 
Version history
 
     
  • Added in version 1.0.0.
    •  
   
 
   
  
 
 
 
 
 
 Copyright © 2013-2025 Niels Lohmann 
 
 
             
 
 
 
 
 
 
 
     
\ No newline at end of file
+

Version history

  • Added in version 1.0.0.
Copyright © 2013-2025 Niels Lohmann
\ No newline at end of file diff --git a/api/basic_json/is_null/index.html b/api/basic_json/is_null/index.html index eba30eaa1..b00eb9ec8 100644 --- a/api/basic_json/is_null/index.html +++ b/api/basic_json/is_null/index.html @@ -1,4 +1,4 @@ - is_null - JSON for Modern C++
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nlohmann::basic_json::is_null

constexpr bool is_null() const noexcept;
+ is_null - JSON for Modern C++      
 
 
  
 
  
 
 
 
 
  
 
 
 
 
 
  
 
 
 
 
       
nlohmann::basic_json::is_null
 
constexpr bool is_null() const noexcept;
 
 
This function returns true if and only if the JSON value is null.
 
Return value
 
true if type is null, false otherwise.
 
Exception safety
 
No-throw guarantee: this member function never throws exceptions.
 
Complexity
 
Constant.
 
Examples
 
 Example 
The following code exemplifies is_null() for all JSON types.
 
#include <iostream>
 #include <nlohmann/json.hpp>
 
@@ -38,4 +38,4 @@
 false
 false
 false
-
 
 
Version history
 
     
  • Added in version 1.0.0.
    •  
   
 
   
  
 
 
 
 
 
 Copyright © 2013-2025 Niels Lohmann 
 
 
             
 
 
 
 
 
 
 
     
\ No newline at end of file
+

Version history

  • Added in version 1.0.0.
Copyright © 2013-2025 Niels Lohmann
\ No newline at end of file diff --git a/api/basic_json/is_number/index.html b/api/basic_json/is_number/index.html index cb929cb5e..6c9c14adc 100644 --- a/api/basic_json/is_number/index.html +++ b/api/basic_json/is_number/index.html @@ -1,4 +1,4 @@ - is_number - JSON for Modern C++
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nlohmann::basic_json::is_number

constexpr bool is_number() const noexcept;
+ is_number - JSON for Modern C++      
 
 
  
 
  
 
 
 
 
  
 
 
 
 
 
  
 
 
 
 
       
nlohmann::basic_json::is_number
 
constexpr bool is_number() const noexcept;
 
 
This function returns true if and only if the JSON value is a number. This includes both integer (signed and unsigned) and floating-point values.
 
Return value
 
true if type is number (regardless whether integer, unsigned integer, or floating-type), false otherwise.
 
Exception safety
 
No-throw guarantee: this member function never throws exceptions.
 
Complexity
 
Constant.
 
Possible implementation
 
constexpr bool is_number() const noexcept
 {
     return is_number_integer() || is_number_float();
@@ -42,4 +42,4 @@
 false
 false
 false
-
  
See also
  
Version history
 
     
  • Added in version 1.0.0.
    •  
  • Extended to also return true for unsigned integers in 2.0.0.
    •  
   
 
   
  
 
 
 
 
 
 Copyright © 2013-2025 Niels Lohmann 
 
 
             
 
 
 
 
 
 
 
     
\ No newline at end of file
+

See also

Version history

  • Added in version 1.0.0.
  • Extended to also return true for unsigned integers in 2.0.0.
Copyright © 2013-2025 Niels Lohmann
\ No newline at end of file diff --git a/api/basic_json/is_number_float/index.html b/api/basic_json/is_number_float/index.html index 67b8b75d6..2382bd8c5 100644 --- a/api/basic_json/is_number_float/index.html +++ b/api/basic_json/is_number_float/index.html @@ -1,4 +1,4 @@ - is_number_float - JSON for Modern C++
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nlohmann::basic_json::is_number_float

constexpr bool is_number_float() const noexcept;
+ is_number_float - JSON for Modern C++      
 
 
  
 
  
 
 
 
 
  
 
 
 
 
 
  
 
 
 
 
       
nlohmann::basic_json::is_number_float
 
constexpr bool is_number_float() const noexcept;
 
 
This function returns true if and only if the JSON value is a floating-point number. This excludes signed and unsigned integer values.
 
Return value
 
true if type is a floating-point number, false otherwise.
 
Exception safety
 
No-throw guarantee: this member function never throws exceptions.
 
Complexity
 
Constant.
 
Examples
 
 Example 
The following code exemplifies is_number_float() for all JSON types.
 
#include <iostream>
 #include <nlohmann/json.hpp>
 
@@ -38,4 +38,4 @@
 false
 false
 false
-
 
 
See also
  
Version history
 
     
  • Added in version 1.0.0.
    •  
   
 
   
  
 
 
 
 
 
 Copyright © 2013-2025 Niels Lohmann 
 
 
             
 
 
 
 
 
 
 
     
\ No newline at end of file
+

See also

Version history

  • Added in version 1.0.0.
Copyright © 2013-2025 Niels Lohmann
\ No newline at end of file diff --git a/api/basic_json/is_number_integer/index.html b/api/basic_json/is_number_integer/index.html index 14b49dc6b..3f40c5d53 100644 --- a/api/basic_json/is_number_integer/index.html +++ b/api/basic_json/is_number_integer/index.html @@ -1,4 +1,4 @@ - is_number_integer - JSON for Modern C++
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nlohmann::basic_json::is_number_integer

constexpr bool is_number_integer() const noexcept;
+ is_number_integer - JSON for Modern C++      
 
 
  
 
  
 
 
 
 
  
 
 
 
 
 
  
 
 
 
 
       
nlohmann::basic_json::is_number_integer
 
constexpr bool is_number_integer() const noexcept;
 
 
This function returns true if and only if the JSON value is a signed or unsigned integer number. This excludes floating-point values.
 
Return value
 
true if type is an integer or unsigned integer number, false otherwise.
 
Exception safety
 
No-throw guarantee: this member function never throws exceptions.
 
Complexity
 
Constant.
 
Examples
 
 Example 
The following code exemplifies is_number_integer() for all JSON types.
 
#include <iostream>
 #include <nlohmann/json.hpp>
 
@@ -38,4 +38,4 @@
 false
 false
 false
-
 
 
See also
  
Version history
 
     
  • Added in version 1.0.0.
    •  
  • Extended to also return true for unsigned integers in 2.0.0.
    •  
   
 
   
  
 
 
 
 
 
 Copyright © 2013-2025 Niels Lohmann 
 
 
             
 
 
 
 
 
 
 
     
\ No newline at end of file
+

See also

Version history

  • Added in version 1.0.0.
  • Extended to also return true for unsigned integers in 2.0.0.
Copyright © 2013-2025 Niels Lohmann
\ No newline at end of file diff --git a/api/basic_json/is_number_unsigned/index.html b/api/basic_json/is_number_unsigned/index.html index 44f316891..0e2b86fde 100644 --- a/api/basic_json/is_number_unsigned/index.html +++ b/api/basic_json/is_number_unsigned/index.html @@ -1,4 +1,4 @@ - is_number_unsigned - JSON for Modern C++
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nlohmann::basic_json::is_number_unsigned

constexpr bool is_number_unsigned() const noexcept;
+ is_number_unsigned - JSON for Modern C++      
 
 
  
 
  
 
 
 
 
  
 
 
 
 
 
  
 
 
 
 
       
nlohmann::basic_json::is_number_unsigned
 
constexpr bool is_number_unsigned() const noexcept;
 
 
This function returns true if and only if the JSON value is an unsigned integer number. This excludes floating-point and signed integer values.
 
Return value
 
true if type is an unsigned integer number, false otherwise.
 
Exception safety
 
No-throw guarantee: this member function never throws exceptions.
 
Complexity
 
Constant.
 
Examples
 
 Example 
The following code exemplifies is_number_unsigned() for all JSON types.
 
#include <iostream>
 #include <nlohmann/json.hpp>
 
@@ -38,4 +38,4 @@
 false
 false
 false
-
 
 
See also
  
Version history
 
     
  • Added in version 2.0.0.
    •  
   
 
   
  
 
 
 
 
 
 Copyright © 2013-2025 Niels Lohmann 
 
 
             
 
 
 
 
 
 
 
     
\ No newline at end of file
+

See also

Version history

  • Added in version 2.0.0.
Copyright © 2013-2025 Niels Lohmann
\ No newline at end of file diff --git a/api/basic_json/is_object/index.html b/api/basic_json/is_object/index.html index addca10fd..a77e77593 100644 --- a/api/basic_json/is_object/index.html +++ b/api/basic_json/is_object/index.html @@ -1,4 +1,4 @@ - is_object - JSON for Modern C++
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nlohmann::basic_json::is_object

constexpr bool is_object() const noexcept;
+ is_object - JSON for Modern C++      
 
 
  
 
  
 
 
 
 
  
 
 
 
 
 
  
 
 
 
 
       
nlohmann::basic_json::is_object
 
constexpr bool is_object() const noexcept;
 
 
This function returns true if and only if the JSON value is an object.
 
Return value
 
true if type is an object, false otherwise.
 
Exception safety
 
No-throw guarantee: this member function never throws exceptions.
 
Complexity
 
Constant.
 
Examples
 
 Example 
The following code exemplifies is_object() for all JSON types.
 
#include <iostream>
 #include <nlohmann/json.hpp>
 
@@ -38,4 +38,4 @@
 false
 false
 false
-
 
 
Version history
 
     
  • Added in version 1.0.0.
    •  
   
 
   
  
 
 
 
 
 
 Copyright © 2013-2025 Niels Lohmann 
 
 
             
 
 
 
 
 
 
 
     
\ No newline at end of file
+

Version history

  • Added in version 1.0.0.
Copyright © 2013-2025 Niels Lohmann
\ No newline at end of file diff --git a/api/basic_json/is_primitive/index.html b/api/basic_json/is_primitive/index.html index 7916a6586..988ee24e7 100644 --- a/api/basic_json/is_primitive/index.html +++ b/api/basic_json/is_primitive/index.html @@ -1,4 +1,4 @@ - is_primitive - JSON for Modern C++
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nlohmann::basic_json::is_primitive

constexpr bool is_primitive() const noexcept;
+ is_primitive - JSON for Modern C++      
 
 
  
 
  
 
 
 
 
  
 
 
 
 
 
  
 
 
 
 
       
nlohmann::basic_json::is_primitive
 
constexpr bool is_primitive() const noexcept;
 
 
This function returns true if and only if the JSON type is primitive (string, number, boolean, null, binary).
 
Return value
 
true if type is primitive (string, number, boolean, null, or binary), false otherwise.
 
Exception safety
 
No-throw guarantee: this member function never throws exceptions.
 
Complexity
 
Constant.
 
Possible implementation
 
constexpr bool is_primitive() const noexcept
 {
     return is_null() || is_string() || is_boolean() || is_number() || is_binary();
@@ -42,4 +42,4 @@
 false
 true
 true
-
  
See also
  
Version history
 
     
  • Added in version 1.0.0.
    •  
  • Extended to return true for binary types in version 3.8.0.
    •  
   
 
   
  
 
 
 
 
 
 Copyright © 2013-2025 Niels Lohmann 
 
 
             
 
 
 
 
 
 
 
     
\ No newline at end of file
+

See also

Version history

  • Added in version 1.0.0.
  • Extended to return true for binary types in version 3.8.0.
Copyright © 2013-2025 Niels Lohmann
\ No newline at end of file diff --git a/api/basic_json/is_string/index.html b/api/basic_json/is_string/index.html index f780d3af7..cb9c56d7a 100644 --- a/api/basic_json/is_string/index.html +++ b/api/basic_json/is_string/index.html @@ -1,4 +1,4 @@ - is_string - JSON for Modern C++
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nlohmann::basic_json::is_string

constexpr bool is_string() const noexcept;
+ is_string - JSON for Modern C++      
 
 
  
 
  
 
 
 
 
  
 
 
 
 
 
  
 
 
 
 
       
nlohmann::basic_json::is_string
 
constexpr bool is_string() const noexcept;
 
 
This function returns true if and only if the JSON value is a string.
 
Return value
 
true if type is a string, false otherwise.
 
Exception safety
 
No-throw guarantee: this member function never throws exceptions.
 
Complexity
 
Constant.
 
Examples
 
 Example 
The following code exemplifies is_string() for all JSON types.
 
#include <iostream>
 #include <nlohmann/json.hpp>
 
@@ -38,4 +38,4 @@
 false
 true
 false
-
 
 
Version history
 
     
  • Added in version 1.0.0.
    •  
   
 
   
  
 
 
 
 
 
 Copyright © 2013-2025 Niels Lohmann 
 
 
             
 
 
 
 
 
 
 
     
\ No newline at end of file
+

Version history

  • Added in version 1.0.0.
Copyright © 2013-2025 Niels Lohmann
\ No newline at end of file diff --git a/api/basic_json/is_structured/index.html b/api/basic_json/is_structured/index.html index 468e81d9b..028cd184d 100644 --- a/api/basic_json/is_structured/index.html +++ b/api/basic_json/is_structured/index.html @@ -1,4 +1,4 @@ - is_structured - JSON for Modern C++
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nlohmann::basic_json::is_structured

constexpr bool is_structured() const noexcept;
+ is_structured - JSON for Modern C++      
 
 
  
 
  
 
 
 
 
  
 
 
 
 
 
  
 
 
 
 
       
nlohmann::basic_json::is_structured
 
constexpr bool is_structured() const noexcept;
 
 
This function returns true if and only if the JSON type is structured (array or object).
 
Return value
 
true if type is structured (array or object), false otherwise.
 
Exception safety
 
No-throw guarantee: this member function never throws exceptions.
 
Complexity
 
Constant.
 
Possible implementation
 
constexpr bool is_structured() const noexcept
 {
     return is_array() || is_object();
@@ -42,4 +42,4 @@
 true
 false
 false
-
  
See also
  
Version history
 
     
  • Added in version 1.0.0.
    •  
   
 
   
  
 
 
 
 
 
 Copyright © 2013-2025 Niels Lohmann 
 
 
             
 
 
 
 
 
 
 
     
\ No newline at end of file
+

See also

Version history

  • Added in version 1.0.0.
Copyright © 2013-2025 Niels Lohmann
\ No newline at end of file diff --git a/api/basic_json/items/index.html b/api/basic_json/items/index.html index 6e1e63bde..b664bcc6a 100644 --- a/api/basic_json/items/index.html +++ b/api/basic_json/items/index.html @@ -1,4 +1,4 @@ - items - JSON for Modern C++
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nlohmann::basic_json::items

iteration_proxy<iterator> items() noexcept;
+ items - JSON for Modern C++      
 
 
  
 
  
 
 
 
 
  
 
 
 
 
 
  
 
 
 
 
       
nlohmann::basic_json::items
 
iteration_proxy<iterator> items() noexcept;
 iteration_proxy<const_iterator> items() const noexcept;
 
 
This function allows accessing iterator::key() and iterator::value() during range-based for loops. In these loops, a reference to the JSON values is returned, so there is no access to the underlying iterator.
 
For loop without items() function:
 
for (auto it = j_object.begin(); it != j_object.end(); ++it)
 {
@@ -47,4 +47,4 @@
 key: 2, value: 4
 key: 3, value: 8
 key: 4, value: 16
-
  
Version history
 
     
  • Added iterator_wrapper in version 3.0.0.
    •  
  • Added items and deprecated iterator_wrapper in version 3.1.0.
    •  
  • Added structured binding support in version 3.5.0.
    •  
 
 
Deprecation
 
This function replaces the static function iterator_wrapper which was introduced in version 1.0.0, but has been deprecated in version 3.1.0. Function iterator_wrapper will be removed in version 4.0.0. Please replace all occurrences of iterator_wrapper(j) with j.items().
 
You should be warned by your compiler with a -Wdeprecated-declarations warning if you are using a deprecated function.
 
   
 
   
  
 
 
 
 
 
 Copyright © 2013-2025 Niels Lohmann 
 
 
             
 
 
 
 
 
 
 
     
\ No newline at end of file
+

Version history

  • Added iterator_wrapper in version 3.0.0.
  • Added items and deprecated iterator_wrapper in version 3.1.0.
  • Added structured binding support in version 3.5.0.

Deprecation

This function replaces the static function iterator_wrapper which was introduced in version 1.0.0, but has been deprecated in version 3.1.0. Function iterator_wrapper will be removed in version 4.0.0. Please replace all occurrences of iterator_wrapper(j) with j.items().

You should be warned by your compiler with a -Wdeprecated-declarations warning if you are using a deprecated function.

Copyright © 2013-2025 Niels Lohmann
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nlohmann::basic_json::json_base_class_t

using json_base_class_t = detail::json_base_class<CustomBaseClass>;
+ json_base_class_t - JSON for Modern C++      
 
 
  
 
  
 
 
 
 
  
 
 
 
 
 
  
 
 
 
 
       
nlohmann::basic_json::json_base_class_t
 
using json_base_class_t = detail::json_base_class<CustomBaseClass>;
 
 
The base class used to inject custom functionality into each instance of basic_json. Examples of such functionality might be metadata, additional member functions (e.g., visitors), or other application-specific code.
 
Template parameters
 
 
CustomBaseClass
 
the base class to be added to basic_json
 
 
Notes
 
Default type
 
The default value for CustomBaseClass is void. In this case, an empty base class is used and no additional functionality is injected.
 
Limitations
 
The type CustomBaseClass has to be a default-constructible class. basic_json only supports copy/move construction/assignment if CustomBaseClass does so as well.
 
Examples
 
 Example 
The following code shows how to inject custom data and methods for each node.
 
#include <iostream>
 #include <nlohmann/json.hpp>
 
@@ -91,4 +91,4 @@
 /null - metadata = 42 -> null
 /object - metadata = 21 -> {"uint":1}
 /object/uint - metadata = 42 -> 1
-
 
 
Version history
 
     
  • Added in version 3.12.0.
    •  
   
 
   
  
 
 
 
 
 
 Copyright © 2013-2025 Niels Lohmann 
 
 
             
 
 
 
 
 
 
 
     
\ No newline at end of file
+

Version history

  • Added in version 3.12.0.
Copyright © 2013-2025 Niels Lohmann
\ No newline at end of file diff --git a/api/basic_json/json_serializer/index.html b/api/basic_json/json_serializer/index.html index d21ef67e4..34946514b 100644 --- a/api/basic_json/json_serializer/index.html +++ b/api/basic_json/json_serializer/index.html @@ -1,4 +1,4 @@ - json_serializer - JSON for Modern C++
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nlohmann::basic_json::json_serializer

template<typename T, typename SFINAE>
+ json_serializer - JSON for Modern C++      
 
 
  
 
  
 
 
 
 
  
 
 
 
 
 
  
 
 
 
 
       
nlohmann::basic_json::json_serializer
 
template<typename T, typename SFINAE>
 using json_serializer = JSONSerializer<T, SFINAE>;
 
 
Template parameters
 
 
T
 
type to convert; will be used in the to_json/from_json functions
 
SFINAE
 
type to add compile type checks via SFINAE; usually void
 
 
Notes
 
Default type
 
The default values for json_serializer is adl_serializer.
 
Examples
 
 Example 
The example below shows how a conversion of a non-default-constructible type is implemented via a specialization of the adl_serializer.
 
#include <iostream>
 #include <nlohmann/json.hpp>
@@ -54,4 +54,4 @@
     std::cout << p.name << " (" << p.age << ") lives in " << p.address << std::endl;
 }
 
 
Output:
 
Ned Flanders (60) lives in 744 Evergreen Terrace
-
 
 
Version history
 
     
  • Since version 2.0.0.
    •  
   
 
   
  
 
 
 
 
 
 Copyright © 2013-2025 Niels Lohmann 
 
 
             
 
 
 
 
 
 
 
     
\ No newline at end of file
+

Version history

  • Since version 2.0.0.
Copyright © 2013-2025 Niels Lohmann
\ No newline at end of file diff --git a/api/basic_json/max_size/index.html b/api/basic_json/max_size/index.html index 283b08ecd..1212ded17 100644 --- a/api/basic_json/max_size/index.html +++ b/api/basic_json/max_size/index.html @@ -1,4 +1,4 @@ - max_size - JSON for Modern C++
Skip to content

nlohmann::basic_json::max_size

size_type max_size() const noexcept;
+ max_size - JSON for Modern C++      
 
 
  
 
  
 
 
 
 
  
 
 
 
 
 
  
 
 
 
 
       
nlohmann::basic_json::max_size
 
size_type max_size() const noexcept;
 
 
Returns the maximum number of elements a JSON value is able to hold due to system or library implementation limitations, i.e. std::distance(begin(), end()) for the JSON value.
 
Return value
 
The return value depends on the different types and is defined as follows:
 
  
 Value type return value 
   
 null 0 (same as size()) 
 
 boolean 1 (same as size()) 
 
 string 1 (same as size()) 
 
 number 1 (same as size()) 
 
 binary 1 (same as size()) 
 
 object result of function object_t::max_size() 
 
 array result of function array_t::max_size() 
  
 
Exception safety
 
No-throw guarantee: this function never throws exceptions.
 
Complexity
 
Constant, as long as array_t and object_t satisfy the Container concept; that is, their max_size() functions have constant complexity.
 
Notes
 
This function does not return the maximal length of a string stored as JSON value -- it returns the maximal number of string elements the JSON value can store which is 1.
 
Examples
 
 Example 
The following code calls max_size() on the different value types.
 
#include <iostream>
 #include <nlohmann/json.hpp>
 
@@ -31,4 +31,4 @@
 115292150460684697
 576460752303423487
 1
-
 
Note the output is platform-dependent.
 
 
Version history
 
     
  • Added in version 1.0.0.
    •  
  • Extended to return 1 for binary types in version 3.8.0.
    •  
   
 
   
  
 
 
 
 
 
 Copyright © 2013-2025 Niels Lohmann 
 
 
             
 
 
 
 
 
 
 
     
\ No newline at end of file
+

Note the output is platform-dependent.

Version history

  • Added in version 1.0.0.
  • Extended to return 1 for binary types in version 3.8.0.
Copyright © 2013-2025 Niels Lohmann
\ No newline at end of file diff --git a/api/basic_json/merge_patch/index.html b/api/basic_json/merge_patch/index.html index 7a8ad6f9a..62e121e3b 100644 --- a/api/basic_json/merge_patch/index.html +++ b/api/basic_json/merge_patch/index.html @@ -1,4 +1,4 @@ - merge_patch - JSON for Modern C++
Skip to content

nlohmann::basic_json::merge_patch

void merge_patch(const basic_json& apply_patch);
+ merge_patch - JSON for Modern C++      
 
 
  
 
  
 
 
 
 
  
 
 
 
 
 
  
 
 
 
 
       
nlohmann::basic_json::merge_patch
 
void merge_patch(const basic_json& apply_patch);
 
 
The merge patch format is primarily intended for use with the HTTP PATCH method as a means of describing a set of modifications to a target resource's content. This function applies a merge patch to the current JSON value.
 
The function implements the following algorithm from Section 2 of RFC 7396 (JSON Merge Patch):
 
define MergePatch(Target, Patch):
   if Patch is an Object:
     if Target is not an Object:
@@ -64,4 +64,4 @@
     ],
     "title": "Hello!"
 }
-
  
See also
  
Version history
 
     
  • Added in version 3.0.0.
    •  
   
 
   
  
 
 
 
 
 
 Copyright © 2013-2025 Niels Lohmann 
 
 
             
 
 
 
 
 
 
 
     
\ No newline at end of file
+

See also

Version history

  • Added in version 3.0.0.
Copyright © 2013-2025 Niels Lohmann
\ No newline at end of file diff --git a/api/basic_json/meta/index.html b/api/basic_json/meta/index.html index 6afd84044..5122f7eac 100644 --- a/api/basic_json/meta/index.html +++ b/api/basic_json/meta/index.html @@ -1,4 +1,4 @@ - meta - JSON for Modern C++
Skip to content

nlohmann::basic_json::meta

static basic_json meta();
+ meta - JSON for Modern C++      
 
 
  
 
  
 
 
 
 
  
 
 
 
 
 
  
 
 
 
 
       
nlohmann::basic_json::meta
 
static basic_json meta();
 
 
This function returns a JSON object with information about the library, including the version number and information on the platform and compiler.
 
Return value
 
JSON object holding version information
 
  
 key description 
   
 compiler Information on the used compiler. It is an object with the following keys: c++ (the used C++ standard), family (the compiler family; possible values are clang, icc, gcc, ilecpp, msvc, pgcpp, sunpro, and unknown), and version (the compiler version). 
 
 copyright The copyright line for the library as string. 
 
 name The name of the library as string. 
 
 platform The used platform as string. Possible values are win32, linux, apple, unix, and unknown. 
 
 url The URL of the project as string. 
 
 version The version of the library. It is an object with the following keys: major, minor, and patch as defined by Semantic Versioning, and string (the version string). 
  
 
Exception safety
 
Strong guarantee: if an exception is thrown, there are no changes to any JSON value.
 
Complexity
 
Constant.
 
Examples
 
 Example 
The following code shows an example output of the meta() function.
 
#include <iostream>
 #include <iomanip>
 #include <nlohmann/json.hpp>
@@ -27,4 +27,4 @@
         "string": "3.12.0"
     }
 }
-
 
Note the output is platform-dependent.
 
 
See also
  
Version history
 
     
  • Added in version 2.1.0.
    •  
   
 
   
  
 
 
 
 
 
 Copyright © 2013-2025 Niels Lohmann 
 
 
             
 
 
 
 
 
 
 
     
\ No newline at end of file
+

Note the output is platform-dependent.

See also

Version history

  • Added in version 2.1.0.
Copyright © 2013-2025 Niels Lohmann
\ No newline at end of file diff --git a/api/basic_json/number_float_t/index.html b/api/basic_json/number_float_t/index.html index 3e9c140f8..17d2f7c61 100644 --- a/api/basic_json/number_float_t/index.html +++ b/api/basic_json/number_float_t/index.html @@ -1,4 +1,4 @@ - number_float_t - JSON for Modern C++
Skip to content

nlohmann::basic_json::number_float_t

using number_float_t = NumberFloatType;
+ number_float_t - JSON for Modern C++      
 
 
  
 
  
 
 
 
 
  
 
 
 
 
 
  
 
 
 
 
       
nlohmann::basic_json::number_float_t
 
using number_float_t = NumberFloatType;
 
 
The type used to store JSON numbers (floating-point).
 
RFC 8259 describes numbers as follows:
 
 
The representation of numbers is similar to that used in most programming languages. A number is represented in base 10 using decimal digits. It contains an integer component that may be prefixed with an optional minus sign, which may be followed by a fraction part and/or an exponent part. Leading zeros are not allowed. (...) Numeric values that cannot be represented in the grammar below (such as Infinity and NaN) are not permitted.
 
 
This description includes both integer and floating-point numbers. However, C++ allows more precise storage if it is known whether the number is a signed integer, an unsigned integer, or a floating-point number. Therefore, three different types, number_integer_t, number_unsigned_t and number_float_t are used.
 
To store floating-point numbers in C++, a type is defined by the template parameter NumberFloatType which chooses the type to use.
 
Notes
 
Default type
 
With the default values for NumberFloatType (double), the default value for number_float_t is double.
 
Default behavior
 
     
  • The restrictions about leading zeros are not enforced in C++. Instead, leading zeros in floating-point literals will be ignored. Internally, the value will be stored as a decimal number. For instance, the C++ floating-point literal 01.2 will be serialized to 1.2. During deserialization, leading zeros yield an error.
    •  
  • Not-a-number (NaN) values will be serialized to null.
    •  
 
Limits
 
RFC 8259 states:
 
 
This specification allows implementations to set limits on the range and precision of numbers accepted. Since software that implements IEEE 754-2008 binary64 (double precision) numbers is generally available and widely used, good interoperability can be achieved by implementations that expect no more precision or range than these provide, in the sense that implementations will approximate JSON numbers within the expected precision.
 
 
This implementation does exactly follow this approach, as it uses double precision floating-point numbers. Note values smaller than -1.79769313486232e+308 and values greater than 1.79769313486232e+308 will be stored as NaN internally and be serialized to null.
 
Storage
 
Floating-point number values are stored directly inside a basic_json type.
 
Examples
 
 Example 
The following code shows that number_float_t is by default, a typedef to double.
 
#include <iostream>
 #include <iomanip>
 #include <nlohmann/json.hpp>
@@ -10,4 +10,4 @@
     std::cout << std::boolalpha << std::is_same<double, json::number_float_t>::value << std::endl;
 }
 
 
Output:
 
true
-
 
 
Version history
 
     
  • Added in version 1.0.0.
    •  
   
 
   
  
 
 
 
 
 
 Copyright © 2013-2025 Niels Lohmann 
 
 
             
 
 
 
 
 
 
 
     
\ No newline at end of file
+

Version history

  • Added in version 1.0.0.
Copyright © 2013-2025 Niels Lohmann
\ No newline at end of file diff --git a/api/basic_json/number_integer_t/index.html b/api/basic_json/number_integer_t/index.html index a2dbe5257..7ac180736 100644 --- a/api/basic_json/number_integer_t/index.html +++ b/api/basic_json/number_integer_t/index.html @@ -1,4 +1,4 @@ - number_integer_t - JSON for Modern C++
Skip to content

nlohmann::basic_json::number_integer_t

using number_integer_t = NumberIntegerType;
+ number_integer_t - JSON for Modern C++      
 
 
  
 
  
 
 
 
 
  
 
 
 
 
 
  
 
 
 
 
       
nlohmann::basic_json::number_integer_t
 
using number_integer_t = NumberIntegerType;
 
 
The type used to store JSON numbers (integers).
 
RFC 8259 describes numbers as follows:
 
 
The representation of numbers is similar to that used in most programming languages. A number is represented in base 10 using decimal digits. It contains an integer component that may be prefixed with an optional minus sign, which may be followed by a fraction part and/or an exponent part. Leading zeros are not allowed. (...) Numeric values that cannot be represented in the grammar below (such as Infinity and NaN) are not permitted.
 
 
This description includes both integer and floating-point numbers. However, C++ allows more precise storage if it is known whether the number is a signed integer, an unsigned integer, or a floating-point number. Therefore, three different types, number_integer_t, number_unsigned_t and number_float_t are used.
 
To store integer numbers in C++, a type is defined by the template parameter NumberIntegerType which chooses the type to use.
 
Notes
 
Default type
 
With the default values for NumberIntegerType (std::int64_t), the default value for number_integer_t is std::int64_t.
 
Default behavior
 
     
  • The restrictions about leading zeros are not enforced in C++. Instead, leading zeros in integer literals lead to an interpretation as an octal number. Internally, the value will be stored as a decimal number. For instance, the C++ integer literal 010 will be serialized to 8. During deserialization, leading zeros yield an error.
    •  
  • Not-a-number (NaN) values will be serialized to null.
    •  
 
Limits
 
RFC 8259 specifies:
 
 
An implementation may set limits on the range and precision of numbers.
 
 
When the default type is used, the maximal integer number that can be stored is 9223372036854775807 (INT64_MAX) and the minimal integer number that can be stored is -9223372036854775808 (INT64_MIN). Integer numbers that are out of range will yield over/underflow when used in a constructor. During deserialization, too large or small integer numbers will automatically be stored as number_unsigned_t or number_float_t.
 
RFC 8259 further states:
 
 
Note that when such software is used, numbers that are integers and are in the range [-2^{53}+1, 2^{53}-1] are interoperable in the sense that implementations will agree exactly on their numeric values.
 
 
As this range is a subrange of the exactly supported range [INT64_MIN, INT64_MAX], this class's integer type is interoperable.
 
Storage
 
Integer number values are stored directly inside a basic_json type.
 
Examples
 
 Example 
The following code shows that number_integer_t is by default, a typedef to std::int64_t.
 
#include <iostream>
 #include <iomanip>
 #include <nlohmann/json.hpp>
@@ -10,4 +10,4 @@
     std::cout << std::boolalpha << std::is_same<std::int64_t, json::number_integer_t>::value << std::endl;
 }
 
 
Output:
 
true
-
 
 
Version history
 
     
  • Added in version 1.0.0.
    •  
   
 
   
  
 
 
 
 
 
 Copyright © 2013-2025 Niels Lohmann 
 
 
             
 
 
 
 
 
 
 
     
\ No newline at end of file
+

Version history

  • Added in version 1.0.0.
Copyright © 2013-2025 Niels Lohmann
\ No newline at end of file diff --git a/api/basic_json/number_unsigned_t/index.html b/api/basic_json/number_unsigned_t/index.html index bccbd894d..6c3e0b3b3 100644 --- a/api/basic_json/number_unsigned_t/index.html +++ b/api/basic_json/number_unsigned_t/index.html @@ -1,4 +1,4 @@ - number_unsigned_t - JSON for Modern C++
Skip to content

nlohmann::basic_json::number_unsigned_t

using number_unsigned_t = NumberUnsignedType;
+ number_unsigned_t - JSON for Modern C++      
 
 
  
 
  
 
 
 
 
  
 
 
 
 
 
  
 
 
 
 
       
nlohmann::basic_json::number_unsigned_t
 
using number_unsigned_t = NumberUnsignedType;
 
 
The type used to store JSON numbers (unsigned).
 
RFC 8259 describes numbers as follows:
 
 
The representation of numbers is similar to that used in most programming languages. A number is represented in base 10 using decimal digits. It contains an integer component that may be prefixed with an optional minus sign, which may be followed by a fraction part and/or an exponent part. Leading zeros are not allowed. (...) Numeric values that cannot be represented in the grammar below (such as Infinity and NaN) are not permitted.
 
 
This description includes both integer and floating-point numbers. However, C++ allows more precise storage if it is known whether the number is a signed integer, an unsigned integer, or a floating-point number. Therefore, three different types, number_integer_t, number_unsigned_t and number_float_t are used.
 
To store unsigned integer numbers in C++, a type is defined by the template parameter NumberUnsignedType which chooses the type to use.
 
Notes
 
Default type
 
With the default values for NumberUnsignedType (std::uint64_t), the default value for number_unsigned_t is std::uint64_t.
 
Default behavior
 
     
  • The restrictions about leading zeros are not enforced in C++. Instead, leading zeros in integer literals lead to an interpretation as an octal number. Internally, the value will be stored as a decimal number. For instance, the C++ integer literal 010 will be serialized to 8. During deserialization, leading zeros yield an error.
    •  
  • Not-a-number (NaN) values will be serialized to null.
    •  
 
Limits
 
RFC 8259 specifies:
 
 
An implementation may set limits on the range and precision of numbers.
 
 
When the default type is used, the maximal integer number that can be stored is 18446744073709551615 (UINT64_MAX) and the minimal integer number that can be stored is 0. Integer numbers that are out of range will yield over/underflow when used in a constructor. During deserialization, too large or small integer numbers will automatically be stored as number_integer_t or number_float_t.
 
RFC 8259 further states:
 
 
Note that when such software is used, numbers that are integers and are in the range \f[-2^{53}+1, 2^{53}-1]\f are interoperable in the sense that implementations will agree exactly on their numeric values.
 
 
As this range is a subrange (when considered in conjunction with the number_integer_t type) of the exactly supported range [0, UINT64_MAX], this class's integer type is interoperable.
 
Storage
 
Integer number values are stored directly inside a basic_json type.
 
Examples
 
 Example 
The following code shows that number_unsigned_t is by default, a typedef to std::uint64_t.
 
#include <iostream>
 #include <iomanip>
 #include <nlohmann/json.hpp>
@@ -10,4 +10,4 @@
     std::cout << std::boolalpha << std::is_same<std::uint64_t, json::number_unsigned_t>::value << std::endl;
 }
 
 
Output:
 
true
-
 
 
Version history
 
     
  • Added in version 2.0.0.
    •  
   
 
   
  
 
 
 
 
 
 Copyright © 2013-2025 Niels Lohmann 
 
 
             
 
 
 
 
 
 
 
     
\ No newline at end of file
+

Version history

  • Added in version 2.0.0.
Copyright © 2013-2025 Niels Lohmann
\ No newline at end of file diff --git a/api/basic_json/object/index.html b/api/basic_json/object/index.html index 2fcf730c0..8603dc0fd 100644 --- a/api/basic_json/object/index.html +++ b/api/basic_json/object/index.html @@ -1,4 +1,4 @@ - object - JSON for Modern C++
Skip to content

nlohmann::basic_json::object

static basic_json object(initializer_list_t init = {});
+ object - JSON for Modern C++      
 
 
  
 
  
 
 
 
 
  
 
 
 
 
 
  
 
 
 
 
       
nlohmann::basic_json::object
 
static basic_json object(initializer_list_t init = {});
 
 
Creates a JSON object value from a given initializer list. The initializer lists elements must be pairs, and their first elements must be strings. If the initializer list is empty, the empty object {} is created.
 
Parameters
 
 
init (in)
 
initializer list with JSON values to create an object from (optional)
 
 
Return value
 
JSON object value
 
Exception safety
 
Strong guarantee: if an exception is thrown, there are no changes in the JSON value.
 
Exceptions
 
Throws type_error.301 if init is not a list of pairs whose first elements are strings. In this case, no object can be created. When such a value is passed to basic_json(initializer_list_t, bool, value_t), an array would have been created from the passed initializer list init. See the example below.
 
Complexity
 
Linear in the size of init.
 
Notes
 
This function is only added for symmetry reasons. In contrast to the related function array(initializer_list_t), there are no cases that can only be expressed by this function. That is, any initializer list init can also be passed to the initializer list constructor basic_json(initializer_list_t, bool, value_t).
 
Examples
 
 Example 
The following code shows an example for the object function.
 
#include <iostream>
 #include <nlohmann/json.hpp>
 
@@ -31,4 +31,4 @@
 {}
 {"one":1,"two":2}
 [json.exception.type_error.301] cannot create object from initializer list
-
 
 
See also
  
Version history
 
     
  • Added in version 1.0.0.
    •  
   
 
   
  
 
 
 
 
 
 Copyright © 2013-2025 Niels Lohmann 
 
 
             
 
 
 
 
 
 
 
     
\ No newline at end of file
+

See also

Version history

  • Added in version 1.0.0.
Copyright © 2013-2025 Niels Lohmann
\ No newline at end of file diff --git a/api/basic_json/object_comparator_t/index.html b/api/basic_json/object_comparator_t/index.html index 085fa663e..64f5f7057 100644 --- a/api/basic_json/object_comparator_t/index.html +++ b/api/basic_json/object_comparator_t/index.html @@ -1,4 +1,4 @@ - object_comparator_t - JSON for Modern C++
Skip to content

nlohmann::basic_json::object_comparator_t

using object_comparator_t = typename object_t::key_compare;
+ object_comparator_t - JSON for Modern C++      
 
 
  
 
  
 
 
 
 
  
 
 
 
 
 
  
 
 
 
 
       
nlohmann::basic_json::object_comparator_t
 
using object_comparator_t = typename object_t::key_compare;
 // or
 using object_comparator_t = default_object_comparator_t;
 
 
The comparator used by object_t. Defined as typename object_t::key_compare if available, and default_object_comparator_t otherwise.
 
Examples
 
 Example 
The example below demonstrates the used object comparator.
 
#include <iostream>
@@ -14,4 +14,4 @@
 }
 
 
Output:
 
json::object_comparator_t("one", "two") = true
 json::object_comparator_t("three", "four") = false
-
 
 
Version history
 
     
  • Added in version 3.0.0.
    •  
  • Changed to be conditionally defined as typename object_t::key_compare or default_object_comparator_t in version 3.11.0.
    •  
   
 
   
  
 
 
 
 
 
 Copyright © 2013-2025 Niels Lohmann 
 
 
             
 
 
 
 
 
 
 
     
\ No newline at end of file
+

Version history

  • Added in version 3.0.0.
  • Changed to be conditionally defined as typename object_t::key_compare or default_object_comparator_t in version 3.11.0.
Copyright © 2013-2025 Niels Lohmann
\ No newline at end of file diff --git a/api/basic_json/object_t/index.html b/api/basic_json/object_t/index.html index 943fc425c..11549b907 100644 --- a/api/basic_json/object_t/index.html +++ b/api/basic_json/object_t/index.html @@ -1,4 +1,4 @@ - object_t - JSON for Modern C++
Skip to content

nlohmann::basic_json::object_t

using object_t = ObjectType<StringType,
+ object_t - JSON for Modern C++      
 
 
  
 
  
 
 
 
 
  
 
 
 
 
 
  
 
 
 
 
       
nlohmann::basic_json::object_t
 
using object_t = ObjectType<StringType,
                             basic_json,
                             default_object_comparator_t,
                             AllocatorType<std::pair<const StringType, basic_json>>>;
@@ -28,4 +28,4 @@
     std::cout << std::boolalpha << std::is_same<std::map<json::string_t, json>, json::object_t>::value << std::endl;
 }
 
 
Output:
 
true
-
  
Version history
 
     
  • Added in version 1.0.0.
    •  
   
 
   
  
 
 
 
 
 
 Copyright © 2013-2025 Niels Lohmann 
 
 
             
 
 
 
 
 
 
 
     
\ No newline at end of file
+

Version history

  • Added in version 1.0.0.
Copyright © 2013-2025 Niels Lohmann
\ No newline at end of file diff --git a/api/basic_json/operator+=/index.html b/api/basic_json/operator+=/index.html index 0d96e2d87..7bdfca9e7 100644 --- a/api/basic_json/operator+=/index.html +++ b/api/basic_json/operator+=/index.html @@ -1,4 +1,4 @@ - operator+= - JSON for Modern C++
Skip to content

nlohmann::basic_json::operator+=

// (1)
+ operator+= - JSON for Modern C++      
 
 
  
 
  
 
 
 
 
  
 
 
 
 
 
  
 
 
 
 
       
nlohmann::basic_json::operator+=
 
// (1)
 reference operator+=(basic_json&& val);
 reference operator+=(const basic_json& val);
 
@@ -96,4 +96,4 @@
 null
 {"four":4,"one":1,"three":3,"two":2}
 [["five",5]]
-
  
See also
  
Version history
 
     
  1. Since version 1.0.0.
    2.  
  2. Since version 1.0.0.
    3.  
  3. Since version 2.0.0.
    4.  
   
 
   
  
 
 
 
 
 
 Copyright © 2013-2025 Niels Lohmann 
 
 
             
 
 
 
 
 
 
 
     
\ No newline at end of file
+

See also

Version history

  1. Since version 1.0.0.
  2. Since version 1.0.0.
  3. Since version 2.0.0.
Copyright © 2013-2025 Niels Lohmann
\ No newline at end of file diff --git a/api/basic_json/operator=/index.html b/api/basic_json/operator=/index.html index afc165556..5a7fbe9f4 100644 --- a/api/basic_json/operator=/index.html +++ b/api/basic_json/operator=/index.html @@ -1,4 +1,4 @@ - operator= - JSON for Modern C++
Skip to content

nlohmann::basic_json::operator=

basic_json& operator=(basic_json other) noexcept (
+ operator= - JSON for Modern C++      
 
 
  
 
  
 
 
 
 
  
 
 
 
 
 
  
 
 
 
 
       
nlohmann::basic_json::operator=
 
basic_json& operator=(basic_json other) noexcept (
     std::is_nothrow_move_constructible<value_t>::value &&
     std::is_nothrow_move_assignable<value_t>::value &&
     std::is_nothrow_move_constructible<json_value>::value &&
@@ -24,4 +24,4 @@
 }
 
 
Output:
 
23
 23
-
  
Version history
 
     
  • Added in version 1.0.0.
    •  
   
 
   
  
 
 
 
 
 
 Copyright © 2013-2025 Niels Lohmann 
 
 
             
 
 
 
 
 
 
 
     
\ No newline at end of file
+

Version history

  • Added in version 1.0.0.
Copyright © 2013-2025 Niels Lohmann
\ No newline at end of file diff --git a/api/basic_json/operator[]/index.html b/api/basic_json/operator[]/index.html index e83ad0b98..2176a21ab 100644 --- a/api/basic_json/operator[]/index.html +++ b/api/basic_json/operator[]/index.html @@ -1,4 +1,4 @@ - operator[] - JSON for Modern C++
Skip to content

nlohmann::basic_json::operator[]

// (1)
+ operator[] - JSON for Modern C++      
 
 
  
 
  
 
 
 
 
  
 
 
 
 
 
  
 
 
 
 
       
nlohmann::basic_json::operator[]
 
// (1)
 reference operator[](size_type idx);
 const_reference operator[](size_type idx) const;
 
@@ -283,4 +283,4 @@
 "foo"
 [1,2]
 2
-
  
See also
  
Version history
 
     
  1. Added in version 1.0.0.
    2.  
  2. Added in version 1.0.0. Added overloads for T* key in version 1.1.0. Removed overloads for T* key (replaced by 3) in version 3.11.0.
    3.  
  3. Added in version 3.11.0.
    4.  
  4. Added in version 2.0.0.
    5.  
   
 
   
  
 
 
 
 
 
 Copyright © 2013-2025 Niels Lohmann 
 
 
             
 
 
 
 
 
 
 
     
\ No newline at end of file
+

See also

Version history

  1. Added in version 1.0.0.
  2. Added in version 1.0.0. Added overloads for T* key in version 1.1.0. Removed overloads for T* key (replaced by 3) in version 3.11.0.
  3. Added in version 3.11.0.
  4. Added in version 2.0.0.
Copyright © 2013-2025 Niels Lohmann
\ No newline at end of file diff --git a/api/basic_json/operator_ValueType/index.html b/api/basic_json/operator_ValueType/index.html index a8c9d1fe2..ad85117cf 100644 --- a/api/basic_json/operator_ValueType/index.html +++ b/api/basic_json/operator_ValueType/index.html @@ -1,4 +1,4 @@ - operator ValueType - JSON for Modern C++
Skip to content

nlohmann::basic_json::operator ValueType

template<typename ValueType>
+ operator ValueType - JSON for Modern C++      
 
 
  
 
  
 
 
 
 
  
 
 
 
 
 
  
 
 
 
 
       
nlohmann::basic_json::operator ValueType
 
template<typename ValueType>
 JSON_EXPLICIT operator ValueType() const;
 
 
Implicit type conversion between the JSON value and a compatible value. The call is realized by calling get(). See Notes for the meaning of JSON_EXPLICIT.
 
Template parameters
 
 
ValueType
 
the value type to return
 
 
Return value
 
copy of the JSON value, converted to ValueType
 
Exceptions
 
Depends on what json_serializer<ValueType> from_json() method throws
 
Complexity
 
Linear in the size of the JSON value.
 
Notes
 
 
Definition of JSON_EXPLICIT
 
By default JSON_EXPLICIT is defined to the empty string, so the signature is:
 
template<typename ValueType>
 operator ValueType() const;
@@ -76,4 +76,4 @@
 boolean: true
 array: [1,2,3,4,5]
 [json.exception.type_error.302] type must be boolean, but is string
-
  
Version history
    
 
   
  
 
 
 
 
 
 Copyright © 2013-2025 Niels Lohmann 
 
 
             
 
 
 
 
 
 
 
     
\ No newline at end of file
+

Version history

Copyright © 2013-2025 Niels Lohmann
\ No newline at end of file diff --git a/api/basic_json/operator_eq/index.html b/api/basic_json/operator_eq/index.html index 14bc8369d..77237ef80 100644 --- a/api/basic_json/operator_eq/index.html +++ b/api/basic_json/operator_eq/index.html @@ -1,4 +1,4 @@ - operator== - JSON for Modern C++
Skip to content

nlohmann::basic_json::operator==

// until C++20
+ operator== - JSON for Modern C++      
 
 
  
 
  
 
 
 
 
  
 
 
 
 
 
  
 
 
 
 
       
nlohmann::basic_json::operator==
 
// until C++20
 bool operator==(const_reference lhs, const_reference rhs) noexcept;   // (1)
 
 template<typename ScalarType>
@@ -115,4 +115,4 @@
 17 == nullptr false
 "foo" == nullptr false
 null == nullptr true
-
  
Version history
 
     
  1. Added in version 1.0.0. Added C++20 member functions in version 3.11.0.
    2.  
  2. Added in version 1.0.0. Added C++20 member functions in version 3.11.0.
    3.  
   
 
   
  
 
 
 
 
 
 Copyright © 2013-2025 Niels Lohmann 
 
 
             
 
 
 
 
 
 
 
     
\ No newline at end of file
+

Version history

  1. Added in version 1.0.0. Added C++20 member functions in version 3.11.0.
  2. Added in version 1.0.0. Added C++20 member functions in version 3.11.0.
Copyright © 2013-2025 Niels Lohmann
\ No newline at end of file diff --git a/api/basic_json/operator_ge/index.html b/api/basic_json/operator_ge/index.html index 5e8595596..e740e62a2 100644 --- a/api/basic_json/operator_ge/index.html +++ b/api/basic_json/operator_ge/index.html @@ -1,4 +1,4 @@ - operator>= - JSON for Modern C++
Skip to content

nlohmann::basic_json::operator>=

// until C++20
+ operator>= - JSON for Modern C++      
 
 
  
 
  
 
 
 
 
  
 
 
 
 
 
  
 
 
 
 
       
nlohmann::basic_json::operator>=
 
// until C++20
 bool operator>=(const_reference lhs, const_reference rhs) noexcept;   // (1)
 
 template<typename ScalarType>
@@ -34,4 +34,4 @@
 {"A":"a","B":"b"} >= {"A":"a","B":"b"} true
 17 >= 17.0000000000001 false
 "foo" >= "bar" true
-
  
See also
  
Version history
 
     
  1. Added in version 1.0.0. Conditionally removed since C++20 in version 3.11.0.
    2.  
  2. Added in version 1.0.0. Conditionally removed since C++20 in version 3.11.0.
    3.  
   
 
   
  
 
 
 
 
 
 Copyright © 2013-2025 Niels Lohmann 
 
 
             
 
 
 
 
 
 
 
     
\ No newline at end of file
+

See also

Version history

  1. Added in version 1.0.0. Conditionally removed since C++20 in version 3.11.0.
  2. Added in version 1.0.0. Conditionally removed since C++20 in version 3.11.0.
Copyright © 2013-2025 Niels Lohmann
\ No newline at end of file diff --git a/api/basic_json/operator_gt/index.html b/api/basic_json/operator_gt/index.html index c127f01f1..95132c64e 100644 --- a/api/basic_json/operator_gt/index.html +++ b/api/basic_json/operator_gt/index.html @@ -1,4 +1,4 @@ - operator> - JSON for Modern C++
Skip to content

nlohmann::basic_json::operator>

// until C++20
+ operator> - JSON for Modern C++      
 
 
  
 
  
 
 
 
 
  
 
 
 
 
 
  
 
 
 
 
       
nlohmann::basic_json::operator>
 
// until C++20
 bool operator>(const_reference lhs, const_reference rhs) noexcept;   // (1)
 
 template<typename ScalarType>
@@ -34,4 +34,4 @@
 {"A":"a","B":"b"} > {"A":"a","B":"b"} false
 17 > 17.0000000000001 false
 "foo" > "bar" true
-
  
See also
  
Version history
 
     
  1. Added in version 1.0.0. Conditionally removed since C++20 in version 3.11.0.
    2.  
  2. Added in version 1.0.0. Conditionally removed since C++20 in version 3.11.0.
    3.  
   
 
   
  
 
 
 
 
 
 Copyright © 2013-2025 Niels Lohmann 
 
 
             
 
 
 
 
 
 
 
     
\ No newline at end of file
+

See also

Version history

  1. Added in version 1.0.0. Conditionally removed since C++20 in version 3.11.0.
  2. Added in version 1.0.0. Conditionally removed since C++20 in version 3.11.0.
Copyright © 2013-2025 Niels Lohmann
\ No newline at end of file diff --git a/api/basic_json/operator_le/index.html b/api/basic_json/operator_le/index.html index 0c1b7f1d4..b6070fee9 100644 --- a/api/basic_json/operator_le/index.html +++ b/api/basic_json/operator_le/index.html @@ -1,4 +1,4 @@ - operator<= - JSON for Modern C++
Skip to content

nlohmann::basic_json::operator<=

// until C++20
+ operator<= - JSON for Modern C++      
 
 
  
 
  
 
 
 
 
  
 
 
 
 
 
  
 
 
 
 
       
nlohmann::basic_json::operator<=
 
// until C++20
 bool operator<=(const_reference lhs, const_reference rhs) noexcept;   // (1)
 
 template<typename ScalarType>
@@ -34,4 +34,4 @@
 {"A":"a","B":"b"} <= {"A":"a","B":"b"} true
 17 <= 17.0000000000001 true
 "foo" <= "bar" false
-
  
See also
  
Version history
 
     
  1. Added in version 1.0.0. Conditionally removed since C++20 in version 3.11.0.
    2.  
  2. Added in version 1.0.0. Conditionally removed since C++20 in version 3.11.0.
    3.  
   
 
   
  
 
 
 
 
 
 Copyright © 2013-2025 Niels Lohmann 
 
 
             
 
 
 
 
 
 
 
     
\ No newline at end of file
+

See also

Version history

  1. Added in version 1.0.0. Conditionally removed since C++20 in version 3.11.0.
  2. Added in version 1.0.0. Conditionally removed since C++20 in version 3.11.0.
Copyright © 2013-2025 Niels Lohmann
\ No newline at end of file diff --git a/api/basic_json/operator_lt/index.html b/api/basic_json/operator_lt/index.html index d4481a9cf..867ffdbcd 100644 --- a/api/basic_json/operator_lt/index.html +++ b/api/basic_json/operator_lt/index.html @@ -1,4 +1,4 @@ - operator< - JSON for Modern C++
Skip to content

nlohmann::basic_json::operator<

// until C++20
+ operator< - JSON for Modern C++      
 
 
  
 
  
 
 
 
 
  
 
 
 
 
 
  
 
 
 
 
       
nlohmann::basic_json::operator<
 
// until C++20
 bool operator<(const_reference lhs, const_reference rhs) noexcept;   // (1)
 
 template<typename ScalarType>
@@ -34,4 +34,4 @@
 {"A":"a","B":"b"} == {"A":"a","B":"b"} false
 17 == 17.0000000000001 true
 "foo" == "bar" false
-
  
See also
  
Version history
 
     
  1. Added in version 1.0.0. Conditionally removed since C++20 in version 3.11.0.
    2.  
  2. Added in version 1.0.0. Conditionally removed since C++20 in version 3.11.0.
    3.  
   
 
   
  
 
 
 
 
 
 Copyright © 2013-2025 Niels Lohmann 
 
 
             
 
 
 
 
 
 
 
     
\ No newline at end of file
+

See also

Version history

  1. Added in version 1.0.0. Conditionally removed since C++20 in version 3.11.0.
  2. Added in version 1.0.0. Conditionally removed since C++20 in version 3.11.0.
Copyright © 2013-2025 Niels Lohmann
\ No newline at end of file diff --git a/api/basic_json/operator_ne/index.html b/api/basic_json/operator_ne/index.html index f8e36aafc..9a41e606d 100644 --- a/api/basic_json/operator_ne/index.html +++ b/api/basic_json/operator_ne/index.html @@ -1,4 +1,4 @@ - operator!= - JSON for Modern C++
Skip to content

nlohmann::basic_json::operator!=

// until C++20
+ operator!= - JSON for Modern C++      
 
 
  
 
  
 
 
 
 
  
 
 
 
 
 
  
 
 
 
 
       
nlohmann::basic_json::operator!=
 
// until C++20
 bool operator!=(const_reference lhs, const_reference rhs) noexcept;   // (1)
 
 template<typename ScalarType>
@@ -69,4 +69,4 @@
 17 != nullptr true
 "foo" != nullptr true
 null != nullptr false
-
  
Version history
 
     
  1. Added in version 1.0.0. Added C++20 member functions in version 3.11.0.
    2.  
  2. Added in version 1.0.0. Added C++20 member functions in version 3.11.0.
    3.  
   
 
   
  
 
 
 
 
 
 Copyright © 2013-2025 Niels Lohmann 
 
 
             
 
 
 
 
 
 
 
     
\ No newline at end of file
+

Version history

  1. Added in version 1.0.0. Added C++20 member functions in version 3.11.0.
  2. Added in version 1.0.0. Added C++20 member functions in version 3.11.0.
Copyright © 2013-2025 Niels Lohmann
\ No newline at end of file diff --git a/api/basic_json/operator_spaceship/index.html b/api/basic_json/operator_spaceship/index.html index 551df4140..7ac0a2f4d 100644 --- a/api/basic_json/operator_spaceship/index.html +++ b/api/basic_json/operator_spaceship/index.html @@ -1,4 +1,4 @@ - operator - JSON for Modern C++
Skip to content

nlohmann::basic_json::operator<=>

// since C++20
+ operator - JSON for Modern C++      
 
 
  
 
  
 
 
 
 
  
 
 
 
 
 
  
 
 
 
 
       
nlohmann::basic_json::operator<=>
 
// since C++20
 class basic_json {
     std::partial_ordering operator<=>(const_reference rhs) const noexcept;  // (1)
 
@@ -93,4 +93,4 @@
 17 <=> 17.000000 := equivalent
 17 <=> nan := unordered
 "17" <=> 17 := greater
-
  
See also
  
Version history
 
     
  1. Added in version 3.11.0.
    2.  
  2. Added in version 3.11.0.
    3.  
   
 
   
  
 
 
 
 
 
 Copyright © 2013-2025 Niels Lohmann 
 
 
             
 
 
 
 
 
 
 
     
\ No newline at end of file
+

See also

Version history

  1. Added in version 3.11.0.
  2. Added in version 3.11.0.
Copyright © 2013-2025 Niels Lohmann
\ No newline at end of file diff --git a/api/basic_json/operator_value_t/index.html b/api/basic_json/operator_value_t/index.html index 9412c5812..f10d06526 100644 --- a/api/basic_json/operator_value_t/index.html +++ b/api/basic_json/operator_value_t/index.html @@ -1,4 +1,4 @@ - operator value_t - JSON for Modern C++
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nlohmann::basic_json::operator value_t

constexpr operator value_t() const noexcept;
+ operator value_t - JSON for Modern C++      
 
 
  
 
  
 
 
 
 
  
 
 
 
 
 
  
 
 
 
 
       
nlohmann::basic_json::operator value_t
 
constexpr operator value_t() const noexcept;
 
 
Return the type of the JSON value as a value from the value_t enumeration.
 
Return value
 
the type of the JSON value
 
  
 Value type return value 
   
 null value_t::null 
 
 boolean value_t::boolean 
 
 string value_t::string 
 
 number (integer) value_t::number_integer 
 
 number (unsigned integer) value_t::number_unsigned 
 
 number (floating-point) value_t::number_float 
 
 object value_t::object 
 
 array value_t::array 
 
 binary value_t::binary 
 
 discarded value_t::discarded 
  
 
Exception safety
 
No-throw guarantee: this member function never throws exceptions.
 
Complexity
 
Constant.
 
Examples
 
 Example 
The following code exemplifies operator value_t() for all JSON types.
 
#include <iostream>
 #include <nlohmann/json.hpp>
 
@@ -45,4 +45,4 @@
 true
 true
 true
-
 
 
Version history
 
     
  • Added in version 1.0.0.
    •  
  • Added unsigned integer type in version 2.0.0.
    •  
  • Added binary type in version 3.8.0.
    •  
   
 
   
  
 
 
 
 
 
 Copyright © 2013-2025 Niels Lohmann 
 
 
             
 
 
 
 
 
 
 
     
\ No newline at end of file
+

Version history

  • Added in version 1.0.0.
  • Added unsigned integer type in version 2.0.0.
  • Added binary type in version 3.8.0.
Copyright © 2013-2025 Niels Lohmann
\ No newline at end of file diff --git a/api/basic_json/other_error/index.html b/api/basic_json/other_error/index.html index 1738ea015..57c9b6877 100644 --- a/api/basic_json/other_error/index.html +++ b/api/basic_json/other_error/index.html @@ -1,4 +1,4 @@ - other_error - JSON for Modern C++
Skip to content

nlohmann::basic_json::other_error

class other_error : public exception;
+ other_error - JSON for Modern C++      
 
 
  
 
  
 
 
 
 
  
 
 
 
 
 
  
 
 
 
 
       
nlohmann::basic_json::other_error
 
class other_error : public exception;
 
 
This exception is thrown in case of errors that cannot be classified with the other exception types.
 
Exceptions have ids 5xx (see list of other errors).
 
classDiagram
   direction LR
 
@@ -59,4 +59,4 @@
 }
 
 
Output:
 
message: [json.exception.other_error.501] unsuccessful: {"op":"test","path":"/best_biscuit/name","value":"Choco Leibniz"}
 exception id: 501
-
  
See also
  
Version history
 
     
  • Since version 3.0.0.
    •
Copyright © 2013-2025 Niels Lohmann
\ No newline at end of file +

See also

Version history

\ No newline at end of file diff --git a/api/basic_json/out_of_range/index.html b/api/basic_json/out_of_range/index.html index 32d7fed11..48c640c65 100644 --- a/api/basic_json/out_of_range/index.html +++ b/api/basic_json/out_of_range/index.html @@ -1,4 +1,4 @@ - out_of_range - JSON for Modern C++
Skip to content

nlohmann::basic_json::out_of_range

class out_of_range : public exception;
+ out_of_range - JSON for Modern C++      
 
 
  
 
  
 
 
 
 
  
 
 
 
 
 
  
 
 
 
 
       
nlohmann::basic_json::out_of_range
 
class out_of_range : public exception;
 
 
This exception is thrown in case a library function is called on an input parameter that exceeds the expected range, for instance, in the case of array indices or nonexisting object keys.
 
Exceptions have ids 4xx (see list of out-of-range errors).
 
classDiagram
   direction LR
 
@@ -49,4 +49,4 @@
 }
 
 
Output:
 
message: [json.exception.out_of_range.401] array index 4 is out of range
 exception id: 401
-
  
See also
  
Version history
 
     
  • Since version 3.0.0.
    •
Copyright © 2013-2025 Niels Lohmann
\ No newline at end of file +

See also

Version history

\ No newline at end of file diff --git a/api/basic_json/parse/index.html b/api/basic_json/parse/index.html index 7bc3c88ef..e16df9a51 100644 --- a/api/basic_json/parse/index.html +++ b/api/basic_json/parse/index.html @@ -1,4 +1,4 @@ - parse - JSON for Modern C++
Skip to content

nlohmann::basic_json::parse

// (1)
+ parse - JSON for Modern C++      
 
 
  
 
  
 
 
 
 
  
 
 
 
 
 
  
 
 
 
 
       
nlohmann::basic_json::parse
 
// (1)
 template<typename InputType>
 static basic_json parse(InputType&& i,
                         const parser_callback_t cb = nullptr,
@@ -424,4 +424,4 @@
     "Neptune"
   ]
 }
-
  
See also
 
     
  • accept - check if the input is valid JSON
    •  
  • operator>> - deserialize from stream
    •  
 
Version history
 
     
  • Added in version 1.0.0.
    •  
  • Overload for contiguous containers (1) added in version 2.0.3.
    •  
  • Ignoring comments via ignore_comments added in version 3.9.0.
    •  
  • Changed runtime assertion in case of FILE* null pointers to exception in version 3.12.0.
    •  
  • Added ignore_trailing_commas in version 3.12.1.
    •  
 
 
Deprecation
 
Overload (2) replaces calls to parse with a pair of iterators as their first parameter which has been deprecated in version 3.8.0. This overload will be removed in version 4.0.0. Please replace all calls like parse({ptr, ptr+len}, ...); with parse(ptr, ptr+len, ...);.
 
You should be warned by your compiler with a -Wdeprecated-declarations warning if you are using a deprecated function.
 
   
 
   
  
 
 
 
 
 
 Copyright © 2013-2025 Niels Lohmann 
 
 
             
 
 
 
 
 
 
 
     
\ No newline at end of file
+

See also

  • accept - check if the input is valid JSON
  • operator>> - deserialize from stream

Version history

  • Added in version 1.0.0.
  • Overload for contiguous containers (1) added in version 2.0.3.
  • Ignoring comments via ignore_comments added in version 3.9.0.
  • Changed runtime assertion in case of FILE* null pointers to exception in version 3.12.0.
  • Added ignore_trailing_commas in version 3.12.1.

Deprecation

Overload (2) replaces calls to parse with a pair of iterators as their first parameter which has been deprecated in version 3.8.0. This overload will be removed in version 4.0.0. Please replace all calls like parse({ptr, ptr+len}, ...); with parse(ptr, ptr+len, ...);.

You should be warned by your compiler with a -Wdeprecated-declarations warning if you are using a deprecated function.

Copyright © 2013-2025 Niels Lohmann
\ No newline at end of file diff --git a/api/basic_json/parse_error/index.html b/api/basic_json/parse_error/index.html index 253865f5f..28f08cb04 100644 --- a/api/basic_json/parse_error/index.html +++ b/api/basic_json/parse_error/index.html @@ -1,4 +1,4 @@ - parse_error - JSON for Modern C++
Skip to content

nlohmann::basic_json::parse_error

class parse_error : public exception;
+ parse_error - JSON for Modern C++      
 
 
  
 
  
 
 
 
 
  
 
 
 
 
 
  
 
 
 
 
       
nlohmann::basic_json::parse_error
 
class parse_error : public exception;
 
 
The library throws this exception when a parse error occurs. Parse errors can occur during the deserialization of JSON text, BSON, CBOR, MessagePack, UBJSON, as well as when using JSON Patch.
 
Member byte holds the byte index of the last read character in the input file (see note below).
 
Exceptions have ids 1xx (see list of parse errors).
 
classDiagram
   direction LR
 
@@ -50,4 +50,4 @@
 
 
Output:
 
message: [json.exception.parse_error.101] parse error at line 1, column 8: syntax error while parsing value - unexpected ']'; expected '[', '{', or a literal
 exception id: 101
 byte position of error: 8
-
  
See also
  
Version history
 
     
  • Since version 3.0.0.
    •
Copyright © 2013-2025 Niels Lohmann
\ No newline at end of file +

See also

Version history

\ No newline at end of file diff --git a/api/basic_json/parse_event_t/index.html b/api/basic_json/parse_event_t/index.html index adeebce9e..4f3c049f3 100644 --- a/api/basic_json/parse_event_t/index.html +++ b/api/basic_json/parse_event_t/index.html @@ -1,4 +1,4 @@ - parse_event_t - JSON for Modern C++
Skip to content

nlohmann::basic_json::parse_event_t

enum class parse_event_t : std::uint8_t {
+ parse_event_t - JSON for Modern C++      
 
 
  
 
  
 
 
 
 
  
 
 
 
 
 
  
 
 
 
 
       
nlohmann::basic_json::parse_event_t
 
enum class parse_event_t : std::uint8_t {
     object_start,
     object_end,
     array_start,
@@ -6,4 +6,4 @@
     key,
     value
 };
-
 
The parser callback distinguishes the following events:
 
     
  • object_start: the parser read { and started to process a JSON object
    •  
  • key: the parser read a key of a value in an object
    •  
  • object_end: the parser read } and finished processing a JSON object
    •  
  • array_start: the parser read [ and started to process a JSON array
    •  
  • array_end: the parser read ] and finished processing a JSON array
    •  
  • value: the parser finished reading a JSON value
    •  
 
Examples
 
Example when certain parse events are triggered
 
Version history
 
     
  • Added in version 1.0.0.
    •  
   
 
   
  
 
 
 
 
 
 Copyright © 2013-2025 Niels Lohmann 
 
 
             
 
 
 
 
 
 
 
     
\ No newline at end of file
+

The parser callback distinguishes the following events:

  • object_start: the parser read { and started to process a JSON object
  • key: the parser read a key of a value in an object
  • object_end: the parser read } and finished processing a JSON object
  • array_start: the parser read [ and started to process a JSON array
  • array_end: the parser read ] and finished processing a JSON array
  • value: the parser finished reading a JSON value

Examples

Example when certain parse events are triggered

Version history

  • Added in version 1.0.0.
Copyright © 2013-2025 Niels Lohmann
\ No newline at end of file diff --git a/api/basic_json/parser_callback_t/index.html b/api/basic_json/parser_callback_t/index.html index 15bd4ce60..1a90c5c52 100644 --- a/api/basic_json/parser_callback_t/index.html +++ b/api/basic_json/parser_callback_t/index.html @@ -1,4 +1,4 @@ - parser_callback_t - JSON for Modern C++
Skip to content

nlohmann::basic_json::parser_callback_t

template<typename BasicJsonType>
+ parser_callback_t - JSON for Modern C++      
 
 
  
 
  
 
 
 
 
  
 
 
 
 
 
  
 
 
 
 
       
nlohmann::basic_json::parser_callback_t
 
template<typename BasicJsonType>
 using parser_callback_t =
     std::function<bool(int depth, parse_event_t event, BasicJsonType& parsed)>;
 
 
With a parser callback function, the result of parsing a JSON text can be influenced. When passed to parse, it is called on certain events (passed as parse_event_t via parameter event) with a set recursion depth depth and context JSON value parsed. The return value of the callback function is a boolean indicating whether the element that emitted the callback shall be kept or not.
 
We distinguish six scenarios (determined by the event type) in which the callback function can be called. The following table describes the values of the parameters depth, event, and parsed.
 
  
 parameter event description parameter depth parameter parsed 
   
 parse_event_t::object_start the parser read { and started to process a JSON object depth of the parent of the JSON object a JSON value with type discarded 
 
 parse_event_t::key the parser read a key of a value in an object depth of the currently parsed JSON object a JSON string containing the key 
 
 parse_event_t::object_end the parser read } and finished processing a JSON object depth of the parent of the JSON object the parsed JSON object 
 
 parse_event_t::array_start the parser read [ and started to process a JSON array depth of the parent of the JSON array a JSON value with type discarded 
 
 parse_event_t::array_end the parser read ] and finished processing a JSON array depth of the parent of the JSON array the parsed JSON array 
 
 parse_event_t::value the parser finished reading a JSON value depth of the value the parsed JSON value 
  
 
Example when certain parse events are triggered
 
Discarding a value (i.e., returning false) has different effects depending on the context in which function was called:
 
     
  • Discarded values in structured types are skipped. That is, the parser will behave as if the discarded value was never read.
    •  
  • In case a value outside a structured type is skipped, it is replaced with null. This case happens if the top-level element is skipped.
    •  
 
Parameters
 
 
depth (in)
 
the depth of the recursion during parsing
 
event (in)
 
an event of type parse_event_t indicating the context in the callback function has been called
 
parsed (in, out)
 
the current intermediate parse result; note that writing to this value has no effect for parse_event_t::key events
 
 
Return value
 
Whether the JSON value which called the function during parsing should be kept (true) or not (false). In the latter case, it is either skipped completely or replaced by an empty discarded object.
 
Examples
 
 Example 
The example below demonstrates the parse() function with and without callback function.
 
#include <iostream>
@@ -83,4 +83,4 @@
         "Width": 800
     }
 }
-
 
 
Version history
 
     
  • Added in version 1.0.0.
    •  
   
 
   
  
 
 
 
 
 
 Copyright © 2013-2025 Niels Lohmann 
 
 
             
 
 
 
 
 
 
 
     
\ No newline at end of file
+

Version history

  • Added in version 1.0.0.
Copyright © 2013-2025 Niels Lohmann
\ No newline at end of file diff --git a/api/basic_json/patch/index.html b/api/basic_json/patch/index.html index 05c9cbfbc..b2daa3019 100644 --- a/api/basic_json/patch/index.html +++ b/api/basic_json/patch/index.html @@ -1,4 +1,4 @@ - patch - JSON for Modern C++
Skip to content

nlohmann::basic_json::patch

basic_json patch(const basic_json& json_patch) const;
+ patch - JSON for Modern C++      
 
 
  
 
  
 
 
 
 
  
 
 
 
 
 
  
 
 
 
 
       
nlohmann::basic_json::patch
 
basic_json patch(const basic_json& json_patch) const;
 
 
JSON Patch defines a JSON document structure for expressing a sequence of operations to apply to a JSON document. With this function, a JSON Patch is applied to the current JSON value by executing all operations from the patch.
 
Parameters
 
 
json_patch (in)
 
JSON patch document
 
 
Return value
 
patched document
 
Exception safety
 
Strong guarantee: if an exception is thrown, there are no changes in the JSON value.
 
Exceptions
 
     
  • Throws parse_error.104 if the JSON patch does not consist of an array of objects.
    •  
  • Throws parse_error.105 if the JSON patch is malformed (e.g., mandatory attributes are missing); example: "operation add must have member path".
    •  
  • Throws out_of_range.401 if an array index is out of range.
    •  
  • Throws out_of_range.403 if a JSON pointer inside the patch could not be resolved successfully in the current JSON value; example: "key baz not found".
    •  
  • Throws out_of_range.405 if JSON pointer has no parent ("add", "remove", "move")
    •  
  • Throws out_of_range.501 if "test" operation was unsuccessful.
    •  
 
Complexity
 
Linear in the size of the JSON value and the length of the JSON patch. As usually the patch affects only a fraction of the JSON value, the complexity can usually be neglected.
 
Notes
 
The application of a patch is atomic: Either all operations succeed and the patched document is returned or an exception is thrown. In any case, the original value is not changed: the patch is applied to a copy of the value.
 
Examples
 
 Example 
The following code shows how a JSON patch is applied to a value.
 
#include <iostream>
 #include <iomanip>
 #include <nlohmann/json.hpp>
@@ -43,4 +43,4 @@
         "world"
     ]
 }
-
 
 
See also
  
Version history
 
     
  • Added in version 2.0.0.
    •  
   
 
   
  
 
 
 
 
 
 Copyright © 2013-2025 Niels Lohmann 
 
 
             
 
 
 
 
 
 
 
     
\ No newline at end of file
+

See also

Version history

  • Added in version 2.0.0.
Copyright © 2013-2025 Niels Lohmann
\ No newline at end of file diff --git a/api/basic_json/patch_inplace/index.html b/api/basic_json/patch_inplace/index.html index 74d34a89b..0ff9c6ce6 100644 --- a/api/basic_json/patch_inplace/index.html +++ b/api/basic_json/patch_inplace/index.html @@ -1,4 +1,4 @@ - patch_inplace - JSON for Modern C++
Skip to content

nlohmann::basic_json::patch_inplace

void patch_inplace(const basic_json& json_patch) const;
+ patch_inplace - JSON for Modern C++      
 
 
  
 
  
 
 
 
 
  
 
 
 
 
 
  
 
 
 
 
       
nlohmann::basic_json::patch_inplace
 
void patch_inplace(const basic_json& json_patch) const;
 
 
JSON Patch defines a JSON document structure for expressing a sequence of operations to apply to a JSON document. With this function, a JSON Patch is applied to the current JSON value by executing all operations from the patch. This function applies a JSON patch in place and returns void.
 
Parameters
 
 
json_patch (in)
 
JSON patch document
 
 
Exception safety
 
No guarantees, value may be corrupted by an unsuccessful patch operation.
 
Exceptions
 
     
  • Throws parse_error.104 if the JSON patch does not consist of an array of objects.
    •  
  • Throws parse_error.105 if the JSON patch is malformed (e.g., mandatory attributes are missing); example: "operation add must have member path".
    •  
  • Throws out_of_range.401 if an array index is out of range.
    •  
  • Throws out_of_range.403 if a JSON pointer inside the patch could not be resolved successfully in the current JSON value; example: "key baz not found".
    •  
  • Throws out_of_range.405 if JSON pointer has no parent ("add", "remove", "move")
    •  
  • Throws out_of_range.501 if "test" operation was unsuccessful.
    •  
 
Complexity
 
Linear in the size of the JSON value and the length of the JSON patch. As usually the patch affects only a fraction of the JSON value, the complexity can usually be neglected.
 
Notes
 
Unlike patch, patch_inplace applies the operation "in place" and no copy of the JSON value is created. That makes it faster for large documents by avoiding the copy. However, the JSON value might be corrupted if the function throws an exception.
 
Examples
 
 Example 
The following code shows how a JSON patch is applied to a value.
 
#include <iostream>
 #include <iomanip>
 #include <nlohmann/json.hpp>
@@ -47,4 +47,4 @@
         "world"
     ]
 }
-
 
 
See also
  
Version history
 
     
  • Added in version 3.11.0.
    •  
   
 
   
  
 
 
 
 
 
 Copyright © 2013-2025 Niels Lohmann 
 
 
             
 
 
 
 
 
 
 
     
\ No newline at end of file
+

See also

Version history

  • Added in version 3.11.0.
Copyright © 2013-2025 Niels Lohmann
\ No newline at end of file diff --git a/api/basic_json/push_back/index.html b/api/basic_json/push_back/index.html index 22ef86234..ef4baa226 100644 --- a/api/basic_json/push_back/index.html +++ b/api/basic_json/push_back/index.html @@ -1,4 +1,4 @@ - push_back - JSON for Modern C++
Skip to content

nlohmann::basic_json::push_back

// (1)
+ push_back - JSON for Modern C++      
 
 
  
 
  
 
 
 
 
  
 
 
 
 
 
  
 
 
 
 
       
nlohmann::basic_json::push_back
 
// (1)
 void push_back(basic_json&& val);
 void push_back(const basic_json& val);
 
@@ -96,4 +96,4 @@
 null
 {"four":4,"one":1,"three":3,"two":2}
 [["five",5]]
-
  
See also
  
Version history
 
     
  1. Since version 1.0.0.
    2.  
  2. Since version 1.0.0.
    3.  
  3. Since version 2.0.0.
    4.  
   
 
   
  
 
 
 
 
 
 Copyright © 2013-2025 Niels Lohmann 
 
 
             
 
 
 
 
 
 
 
     
\ No newline at end of file
+

See also

Version history

  1. Since version 1.0.0.
  2. Since version 1.0.0.
  3. Since version 2.0.0.
Copyright © 2013-2025 Niels Lohmann
\ No newline at end of file diff --git a/api/basic_json/rbegin/index.html b/api/basic_json/rbegin/index.html index 00d210686..c115bd640 100644 --- a/api/basic_json/rbegin/index.html +++ b/api/basic_json/rbegin/index.html @@ -1,4 +1,4 @@ - rbegin - JSON for Modern C++
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nlohmann::basic_json::rbegin

reverse_iterator rbegin() noexcept;
+ rbegin - JSON for Modern C++      
 
 
  
 
  
 
 
 
 
  
 
 
 
 
 
  
 
 
 
 
       
nlohmann::basic_json::rbegin
 
reverse_iterator rbegin() noexcept;
 const_reverse_iterator rbegin() const noexcept;
 
 
Returns an iterator to the reverse-beginning; that is, the last element.
 
Illustration from cppreference.com
 
Return value
 
reverse iterator to the first element
 
Exception safety
 
No-throw guarantee: this member function never throws exceptions.
 
Complexity
 
Constant.
 
Examples
 
 Example 
The following code shows an example for rbegin().
 
#include <iostream>
 #include <nlohmann/json.hpp>
@@ -17,4 +17,4 @@
     std::cout << *it << '\n';
 }
 
 
Output:
 
5
-
 
 
Version history
 
     
  • Added in version 1.0.0.
    •  
   
 
   
  
 
 
 
 
 
 Copyright © 2013-2025 Niels Lohmann 
 
 
             
 
 
 
 
 
 
 
     
\ No newline at end of file
+

Version history

  • Added in version 1.0.0.
Copyright © 2013-2025 Niels Lohmann
\ No newline at end of file diff --git a/api/basic_json/rend/index.html b/api/basic_json/rend/index.html index 4d379917e..9db323367 100644 --- a/api/basic_json/rend/index.html +++ b/api/basic_json/rend/index.html @@ -1,4 +1,4 @@ - rend - JSON for Modern C++
Skip to content

nlohmann::basic_json::rend

reverse_iterator rend() noexcept;
+ rend - JSON for Modern C++      
 
 
  
 
  
 
 
 
 
  
 
 
 
 
 
  
 
 
 
 
       
nlohmann::basic_json::rend
 
reverse_iterator rend() noexcept;
 const_reverse_iterator rend() const noexcept;
 
 
Returns an iterator to the reverse-end; that is, one before the first element. This element acts as a placeholder, attempting to access it results in undefined behavior.
 
Illustration from cppreference.com
 
Return value
 
reverse iterator to the element following the last element
 
Exception safety
 
No-throw guarantee: this member function never throws exceptions.
 
Complexity
 
Constant.
 
Examples
 
 Example 
The following code shows an example for eend().
 
#include <iostream>
 #include <nlohmann/json.hpp>
@@ -20,4 +20,4 @@
     std::cout << *it << '\n';
 }
 
 
Output:
 
1
-
 
 
Version history
 
     
  • Added in version 1.0.0.
    •  
   
 
   
  
 
 
 
 
 
 Copyright © 2013-2025 Niels Lohmann 
 
 
             
 
 
 
 
 
 
 
     
\ No newline at end of file
+

Version history

  • Added in version 1.0.0.
Copyright © 2013-2025 Niels Lohmann
\ No newline at end of file diff --git a/api/basic_json/sax_parse/index.html b/api/basic_json/sax_parse/index.html index 72b3627c3..ea0ccb272 100644 --- a/api/basic_json/sax_parse/index.html +++ b/api/basic_json/sax_parse/index.html @@ -1,4 +1,4 @@ - sax_parse - JSON for Modern C++
Skip to content

nlohmann::basic_json::sax_parse

// (1)
+ sax_parse - JSON for Modern C++      
 
 
  
 
  
 
 
 
 
  
 
 
 
 
 
  
 
 
 
 
       
nlohmann::basic_json::sax_parse
 
// (1)
 template <typename InputType, typename SAX>
 static bool sax_parse(InputType&& i,
                       SAX* sax,
@@ -183,4 +183,4 @@
             ex=[json.exception.parse_error.101] parse error at line 17, column 6: syntax error while parsing value - unexpected ']'; expected end of input)
 
 result: false
-
  
Version history
 
     
  • Added in version 3.2.0.
    •  
  • Ignoring comments via ignore_comments added in version 3.9.0.
    •  
  • Added ignore_trailing_commas in version 3.12.1.
    •  
 
 
Deprecation
 
Overload (2) replaces calls to sax_parse with a pair of iterators as their first parameter which has been deprecated in version 3.8.0. This overload will be removed in version 4.0.0. Please replace all calls like sax_parse({ptr, ptr+len}); with sax_parse(ptr, ptr+len);.
 
   
 
   
  
 
 
 
 
 
 Copyright © 2013-2025 Niels Lohmann 
 
 
             
 
 
 
 
 
 
 
     
\ No newline at end of file
+

Version history

  • Added in version 3.2.0.
  • Ignoring comments via ignore_comments added in version 3.9.0.
  • Added ignore_trailing_commas in version 3.12.1.

Deprecation

Overload (2) replaces calls to sax_parse with a pair of iterators as their first parameter which has been deprecated in version 3.8.0. This overload will be removed in version 4.0.0. Please replace all calls like sax_parse({ptr, ptr+len}); with sax_parse(ptr, ptr+len);.

Copyright © 2013-2025 Niels Lohmann
\ No newline at end of file diff --git a/api/basic_json/size/index.html b/api/basic_json/size/index.html index decc648b2..53be84f94 100644 --- a/api/basic_json/size/index.html +++ b/api/basic_json/size/index.html @@ -1,4 +1,4 @@ - size - JSON for Modern C++
Skip to content

nlohmann::basic_json::size

size_type size() const noexcept;
+ size - JSON for Modern C++      
 
 
  
 
  
 
 
 
 
  
 
 
 
 
 
  
 
 
 
 
       
nlohmann::basic_json::size
 
size_type size() const noexcept;
 
 
Returns the number of elements in a JSON value.
 
Return value
 
The return value depends on the different types and is defined as follows:
 
  
 Value type return value 
   
 null 0 
 
 boolean 1 
 
 string 1 
 
 number 1 
 
 binary 1 
 
 object result of function object_t::size() 
 
 array result of function array_t::size() 
  
 
Exception safety
 
No-throw guarantee: this function never throws exceptions.
 
Complexity
 
Constant, as long as array_t and object_t satisfy the Container concept; that is, their size() functions have constant complexity.
 
Notes
 
This function does not return the length of a string stored as JSON value -- it returns the number of elements in the JSON value which is 1 in the case of a string.
 
Examples
 
 Example 
The following code calls size() on the different value types.
 
#include <iostream>
 #include <nlohmann/json.hpp>
 
@@ -37,4 +37,4 @@
 5
 0
 1
-
 
 
Version history
 
     
  • Added in version 1.0.0.
    •  
  • Extended to return 1 for binary types in version 3.8.0.
    •  
   
 
   
  
 
 
 
 
 
 Copyright © 2013-2025 Niels Lohmann 
 
 
             
 
 
 
 
 
 
 
     
\ No newline at end of file
+

Version history

  • Added in version 1.0.0.
  • Extended to return 1 for binary types in version 3.8.0.
Copyright © 2013-2025 Niels Lohmann
\ No newline at end of file diff --git a/api/basic_json/start_pos/index.html b/api/basic_json/start_pos/index.html index 5b2eaf50f..7a768ef11 100644 --- a/api/basic_json/start_pos/index.html +++ b/api/basic_json/start_pos/index.html @@ -1,4 +1,4 @@ - start_pos - JSON for Modern C++
Skip to content

nlohmann::basic_json::start_pos

#if JSON_DIAGNOSTIC_POSITIONS
+ start_pos - JSON for Modern C++      
 
 
  
 
  
 
 
 
 
  
 
 
 
 
 
  
 
 
 
 
       
nlohmann::basic_json::start_pos
 
#if JSON_DIAGNOSTIC_POSITIONS
 constexpr std::size_t start_pos() const noexcept;
 #endif
 
 
Returns the position of the first character in the JSON string from which the value was parsed from.
 
  
 JSON type return value 
   
 object position of the opening { 
 
 array position of the opening [ 
 
 string position of the opening " 
 
 number position of the first character 
 
 boolean position of t for true and f for false 
 
 null position of n 
  
 
Return value
 
the position of the first character of the value in the parsed JSON string, if the value was created by the parse function, or std::string::npos if the value was constructed otherwise
 
Exception safety
 
No-throw guarantee: this member function never throws exceptions.
 
Complexity
 
Constant.
 
Notes
 
 
Note
 
The function is only available if macro JSON_DIAGNOSTIC_POSITIONS has been defined to 1 before including the library header.
 
 
 
Invalidation
 
The returned positions are only valid as long as the JSON value is not changed. The positions are not updated when the JSON value is changed.
 
 
Examples
 
 Example 
#include <iostream>
@@ -101,4 +101,4 @@ Original string:
 1
 Parsed string: 
 1
-
 
The output shows the start/end positions of all the objects and fields in the JSON string.
 
 
See also
  
Version history
 
     
  • Added in version 3.12.0.
    •  
   
 
   
  
 
 
 
 
 
 Copyright © 2013-2025 Niels Lohmann 
 
 
             
 
 
 
 
 
 
 
     
\ No newline at end of file
+

The output shows the start/end positions of all the objects and fields in the JSON string.

See also

Version history

  • Added in version 3.12.0.
Copyright © 2013-2025 Niels Lohmann
\ No newline at end of file diff --git a/api/basic_json/std_hash/index.html b/api/basic_json/std_hash/index.html index a814e329c..ed8190915 100644 --- a/api/basic_json/std_hash/index.html +++ b/api/basic_json/std_hash/index.html @@ -1,4 +1,4 @@ - std::hash<basic_json> - JSON for Modern C++
Skip to content

std::hash<nlohmann::basic_json>

namespace std {
+ std::hash<basic_json> - JSON for Modern C++      
 
 
  
 
  
 
 
 
 
  
 
 
 
 
 
  
 
 
 
 
       
std::hash<nlohmann::basic_json>
 
namespace std {
     struct hash<nlohmann::basic_json>;
 }
 
 
Return a hash value for a JSON object. The hash function tries to rely on std::hash where possible. Furthermore, the type of the JSON value is taken into account to have different hash values for null, 0, 0U, and false, etc.
 
Examples
 
 Example 
The example shows how to calculate hash values for different JSON values.
 
#include <iostream>
@@ -28,4 +28,4 @@
 hash({}) = 2654435832
 hash([]) = 2654435899
 hash({"hello": "world"}) = 4469488738203676328
-
 
Note the output is platform-dependent.
 
 
Version history
 
     
  • Added in version 1.0.0.
    •  
  • Extended for arbitrary basic_json types in version 3.10.5.
    •  
   
 
   
  
 
 
 
 
 
 Copyright © 2013-2025 Niels Lohmann 
 
 
             
 
 
 
 
 
 
 
     
\ No newline at end of file
+

Note the output is platform-dependent.

Version history

  • Added in version 1.0.0.
  • Extended for arbitrary basic_json types in version 3.10.5.
Copyright © 2013-2025 Niels Lohmann
\ No newline at end of file diff --git a/api/basic_json/std_swap/index.html b/api/basic_json/std_swap/index.html index 89df5a801..937ac0b51 100644 --- a/api/basic_json/std_swap/index.html +++ b/api/basic_json/std_swap/index.html @@ -1,4 +1,4 @@ - std::swap<basic_json> - JSON for Modern C++
Skip to content

std::swap<basic_json>

namespace std {
+ std::swap<basic_json> - JSON for Modern C++      
 
 
  
 
  
 
 
 
 
  
 
 
 
 
 
  
 
 
 
 
       
std::swap<basic_json>
 
namespace std {
     void swap(nlohmann::basic_json& j1, nlohmann::basic_json& j2);
 }
 
 
Exchanges the values of two JSON objects.
 
Parameters
 
 
j1 (in, out)
 
value to be replaced by j2
 
j2 (in, out)
 
value to be replaced by j1
 
 
Possible implementation
 
void swap(nlohmann::basic_json& j1, nlohmann::basic_json& j2)
@@ -26,4 +26,4 @@
 }
 
 
Output:
 
j1 = {"one":1,"two":2} | j2 = [1,2,4,8,16]
 j1 = [1,2,4,8,16] | j2 = {"one":1,"two":2}
-
  
See also
  
Version history
 
     
  • Added in version 1.0.0.
    •  
  • Extended for arbitrary basic_json types in version 3.10.5.
    •  
   
 
   
  
 
 
 
 
 
 Copyright © 2013-2025 Niels Lohmann 
 
 
             
 
 
 
 
 
 
 
     
\ No newline at end of file
+

See also

Version history

  • Added in version 1.0.0.
  • Extended for arbitrary basic_json types in version 3.10.5.
Copyright © 2013-2025 Niels Lohmann
\ No newline at end of file diff --git a/api/basic_json/string_t/index.html b/api/basic_json/string_t/index.html index d1eb4b8c4..815c5c225 100644 --- a/api/basic_json/string_t/index.html +++ b/api/basic_json/string_t/index.html @@ -1,4 +1,4 @@ - string_t - JSON for Modern C++
Skip to content

nlohmann::basic_json::string_t

using string_t = StringType;
+ string_t - JSON for Modern C++      
 
 
  
 
  
 
 
 
 
  
 
 
 
 
 
  
 
 
 
 
       
nlohmann::basic_json::string_t
 
using string_t = StringType;
 
 
The type used to store JSON strings.
 
RFC 8259 describes JSON strings as follows:
 
 
A string is a sequence of zero or more Unicode characters.
 
 
To store objects in C++, a type is defined by the template parameter described below. Unicode values are split by the JSON class into byte-sized characters during deserialization.
 
Template parameters
 
 
StringType
 
the container to store strings (e.g., std::string). Note this container is used for keys/names in objects, see object_t.
 
 
Notes
 
Default type
 
With the default values for StringType (std::string), the default value for string_t is std::string.
 
Encoding
 
Strings are stored in UTF-8 encoding. Therefore, functions like std::string::size() or std::string::length() return the number of bytes in the string rather than the number of characters or glyphs.
 
String comparison
 
RFC 8259 states:
 
 
Software implementations are typically required to test names of object members for equality. Implementations that transform the textual representation into sequences of Unicode code units and then perform the comparison numerically, code unit by code unit, are interoperable in the sense that implementations will agree in all cases on equality or inequality of two strings. For example, implementations that compare strings with escaped characters unconverted may incorrectly find that "a\\b" and "a\u005Cb" are not equal.
 
 
This implementation is interoperable as it does compare strings code unit by code unit.
 
Storage
 
String values are stored as pointers in a basic_json type. That is, for any access to string values, a pointer of type string_t* must be dereferenced.
 
Examples
 
 Example 
The following code shows that string_t is by default, a typedef to std::string.
 
#include <iostream>
 #include <iomanip>
 #include <nlohmann/json.hpp>
@@ -10,4 +10,4 @@
     std::cout << std::boolalpha << std::is_same<std::string, json::string_t>::value << std::endl;
 }
 
 
Output:
 
true
-
 
 
Version history
 
     
  • Added in version 1.0.0.
    •  
   
 
   
  
 
 
 
 
 
 Copyright © 2013-2025 Niels Lohmann 
 
 
             
 
 
 
 
 
 
 
     
\ No newline at end of file
+

Version history

  • Added in version 1.0.0.
Copyright © 2013-2025 Niels Lohmann
\ No newline at end of file diff --git a/api/basic_json/swap/index.html b/api/basic_json/swap/index.html index c6f2f8009..0b25041b1 100644 --- a/api/basic_json/swap/index.html +++ b/api/basic_json/swap/index.html @@ -1,4 +1,4 @@ - swap - JSON for Modern C++
Skip to content

nlohmann::basic_json::swap

// (1)
+ swap - JSON for Modern C++      
 
 
  
 
  
 
 
 
 
  
 
 
 
 
 
  
 
 
 
 
       
nlohmann::basic_json::swap
 
// (1)
 void swap(reference other) noexcept;
 
 // (2)
@@ -126,4 +126,4 @@
 }
 
 
Output:
 
value = {"bytes":[4,5,6],"subtype":null}
 binary = {"bytes":[1,2,3],"subtype":null}
-
  
See also
  
Version history
 
     
  1. Since version 1.0.0.
    2.  
  2. Since version 1.0.0.
    3.  
  3. Since version 1.0.0.
    4.  
  4. Since version 1.0.0.
    5.  
  5. Since version 1.0.0.
    6.  
  6. Since version 3.8.0.
    7.  
  7. Since version 3.8.0.
    8.  
   
 
   
  
 
 
 
 
 
 Copyright © 2013-2025 Niels Lohmann 
 
 
             
 
 
 
 
 
 
 
     
\ No newline at end of file
+

See also

Version history

  1. Since version 1.0.0.
  2. Since version 1.0.0.
  3. Since version 1.0.0.
  4. Since version 1.0.0.
  5. Since version 1.0.0.
  6. Since version 3.8.0.
  7. Since version 3.8.0.
Copyright © 2013-2025 Niels Lohmann
\ No newline at end of file diff --git a/api/basic_json/to_bjdata/index.html b/api/basic_json/to_bjdata/index.html index df6ca5fc5..0f08b48ef 100644 --- a/api/basic_json/to_bjdata/index.html +++ b/api/basic_json/to_bjdata/index.html @@ -1,4 +1,4 @@ - to_bjdata - JSON for Modern C++
Skip to content

nlohmann::basic_json::to_bjdata

// (1)
+ to_bjdata - JSON for Modern C++      
 
 
  
 
  
 
 
 
 
  
 
 
 
 
 
  
 
 
 
 
       
nlohmann::basic_json::to_bjdata
 
// (1)
 static std::vector<std::uint8_t> to_bjdata(const basic_json& j,
                                            const bool use_size = false,
                                            const bool use_type = false,
@@ -79,4 +79,4 @@
 [i1i2i3i4i5i6i7i8]
 [#i8i1i2i3i4i5i6i7i8
 [$i#i812345678
-
  
Version history
 
     
  • Added in version 3.11.0.
    •  
  • BJData version parameter (for draft3 binary encoding) added in version 3.12.0.
    •  
   
 
   
  
 
 
 
 
 
 Copyright © 2013-2025 Niels Lohmann 
 
 
             
 
 
 
 
 
 
 
     
\ No newline at end of file
+

Version history

  • Added in version 3.11.0.
  • BJData version parameter (for draft3 binary encoding) added in version 3.12.0.
Copyright © 2013-2025 Niels Lohmann
\ No newline at end of file diff --git a/api/basic_json/to_bson/index.html b/api/basic_json/to_bson/index.html index 463725347..cfdbda6ae 100644 --- a/api/basic_json/to_bson/index.html +++ b/api/basic_json/to_bson/index.html @@ -1,4 +1,4 @@ - to_bson - JSON for Modern C++
Skip to content

nlohmann::basic_json::to_bson

// (1)
+ to_bson - JSON for Modern C++      
 
 
  
 
  
 
 
 
 
  
 
 
 
 
 
  
 
 
 
 
       
nlohmann::basic_json::to_bson
 
// (1)
 static std::vector<std::uint8_t> to_bson(const basic_json& j);
 
 // (2)
@@ -27,4 +27,4 @@
     std::cout << std::endl;
 }
 
 
Output:
 
0x1b 0x00 0x00 0x00 0x08 0x63 0x6f 0x6d 0x70 0x61 0x63 0x74 0x00 0x01 0x10 0x73 0x63 0x68 0x65 0x6d 0x61 0x00 0x00 0x00 0x00 0x00 0x00 
-
  
Version history
 
     
  • Added in version 3.4.0.
    •  
   
 
   
  
 
 
 
 
 
 Copyright © 2013-2025 Niels Lohmann 
 
 
             
 
 
 
 
 
 
 
     
\ No newline at end of file
+

Version history

  • Added in version 3.4.0.
Copyright © 2013-2025 Niels Lohmann
\ No newline at end of file diff --git a/api/basic_json/to_cbor/index.html b/api/basic_json/to_cbor/index.html index 86d169309..417eac93a 100644 --- a/api/basic_json/to_cbor/index.html +++ b/api/basic_json/to_cbor/index.html @@ -1,4 +1,4 @@ - to_cbor - JSON for Modern C++
Skip to content

nlohmann::basic_json::to_cbor

// (1)
+ to_cbor - JSON for Modern C++      
 
 
  
 
  
 
 
 
 
  
 
 
 
 
 
  
 
 
 
 
       
nlohmann::basic_json::to_cbor
 
// (1)
 static std::vector<std::uint8_t> to_cbor(const basic_json& j);
 
 // (2)
@@ -27,4 +27,4 @@
     std::cout << std::endl;
 }
 
 
Output:
 
0xa2 0x67 0x63 0x6f 0x6d 0x70 0x61 0x63 0x74 0xf5 0x66 0x73 0x63 0x68 0x65 0x6d 0x61 0x00 
-
  
Version history
 
     
  • Added in version 2.0.9.
    •  
  • Compact representation of floating-point numbers added in version 3.8.0.
    •  
   
 
   
  
 
 
 
 
 
 Copyright © 2013-2025 Niels Lohmann 
 
 
             
 
 
 
 
 
 
 
     
\ No newline at end of file
+

Version history

  • Added in version 2.0.9.
  • Compact representation of floating-point numbers added in version 3.8.0.
Copyright © 2013-2025 Niels Lohmann
\ No newline at end of file diff --git a/api/basic_json/to_msgpack/index.html b/api/basic_json/to_msgpack/index.html index f95a97bc2..7c77f16db 100644 --- a/api/basic_json/to_msgpack/index.html +++ b/api/basic_json/to_msgpack/index.html @@ -1,4 +1,4 @@ - to_msgpack - JSON for Modern C++
Skip to content

nlohmann::basic_json::to_msgpack

// (1)
+ to_msgpack - JSON for Modern C++      
 
 
  
 
  
 
 
 
 
  
 
 
 
 
 
  
 
 
 
 
       
nlohmann::basic_json::to_msgpack
 
// (1)
 static std::vector<std::uint8_t> to_msgpack(const basic_json& j);
 
 // (2)
@@ -27,4 +27,4 @@
     std::cout << std::endl;
 }
 
 
Output:
 
0x82 0xa7 0x63 0x6f 0x6d 0x70 0x61 0x63 0x74 0xc3 0xa6 0x73 0x63 0x68 0x65 0x6d 0x61 0x00 
-
  
Version history
 
     
  • Added in version 2.0.9.
    •  
   
 
   
  
 
 
 
 
 
 Copyright © 2013-2025 Niels Lohmann 
 
 
             
 
 
 
 
 
 
 
     
\ No newline at end of file
+

Version history

  • Added in version 2.0.9.
Copyright © 2013-2025 Niels Lohmann
\ No newline at end of file diff --git a/api/basic_json/to_string/index.html b/api/basic_json/to_string/index.html index 037abc8a8..3e31952bb 100644 --- a/api/basic_json/to_string/index.html +++ b/api/basic_json/to_string/index.html @@ -1,4 +1,4 @@ - to_string - JSON for Modern C++
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to_string(basic_json)

template <typename BasicJsonType>
+ to_string - JSON for Modern C++      
 
 
  
 
  
 
 
 
 
  
 
 
 
 
 
  
 
 
 
 
       
to_string(basic_json)
 
template <typename BasicJsonType>
 std::string to_string(const BasicJsonType& j);
 
 
This function implements a user-defined to_string for JSON objects.
 
Template parameters
 
 
BasicJsonType
 
a specialization of basic_json
 
 
Return value
 
string containing the serialization of the JSON value
 
Exception safety
 
Strong guarantee: if an exception is thrown, there are no changes to any JSON value.
 
Exceptions
 
Throws type_error.316 if a string stored inside the JSON value is not UTF-8 encoded
 
Complexity
 
Linear.
 
Possible implementation
 
template <typename BasicJsonType>
 std::string to_string(const BasicJsonType& j)
@@ -28,4 +28,4 @@
 
 
Output:
 
{"one":1,"two":2}
 
 42
-
  
See also
  
Version history
 
Added in version 3.7.0.
   
 
   
  
 
 
 
 
 
 Copyright © 2013-2025 Niels Lohmann 
 
 
             
 
 
 
 
 
 
 
     
\ No newline at end of file
+

See also

Version history

Added in version 3.7.0.

Copyright © 2013-2025 Niels Lohmann
\ No newline at end of file diff --git a/api/basic_json/to_ubjson/index.html b/api/basic_json/to_ubjson/index.html index 588ec17ec..0402b29a5 100644 --- a/api/basic_json/to_ubjson/index.html +++ b/api/basic_json/to_ubjson/index.html @@ -1,4 +1,4 @@ - to_ubjson - JSON for Modern C++
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nlohmann::basic_json::to_ubjson

// (1)
+ to_ubjson - JSON for Modern C++      
 
 
  
 
  
 
 
 
 
  
 
 
 
 
 
  
 
 
 
 
       
nlohmann::basic_json::to_ubjson
 
// (1)
 static std::vector<std::uint8_t> to_ubjson(const basic_json& j,
                                            const bool use_size = false,
                                            const bool use_type = false);
@@ -76,4 +76,4 @@
 [i1i2i3i4i5i6i7i8]
 [#i8i1i2i3i4i5i6i7i8
 [$i#i812345678
-
  
Version history
 
     
  • Added in version 3.1.0.
    •  
   
 
   
  
 
 
 
 
 
 Copyright © 2013-2025 Niels Lohmann 
 
 
             
 
 
 
 
 
 
 
     
\ No newline at end of file
+

Version history

  • Added in version 3.1.0.
Copyright © 2013-2025 Niels Lohmann
\ No newline at end of file diff --git a/api/basic_json/type/index.html b/api/basic_json/type/index.html index 6eeb049dd..d16aa42bd 100644 --- a/api/basic_json/type/index.html +++ b/api/basic_json/type/index.html @@ -1,4 +1,4 @@ - type - JSON for Modern C++
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nlohmann::basic_json::type

constexpr value_t type() const noexcept;
+ type - JSON for Modern C++      
 
 
  
 
  
 
 
 
 
  
 
 
 
 
 
  
 
 
 
 
       
nlohmann::basic_json::type
 
constexpr value_t type() const noexcept;
 
 
Return the type of the JSON value as a value from the value_t enumeration.
 
Return value
 
the type of the JSON value
 
  
 Value type return value 
   
 null value_t::null 
 
 boolean value_t::boolean 
 
 string value_t::string 
 
 number (integer) value_t::number_integer 
 
 number (unsigned integer) value_t::number_unsigned 
 
 number (floating-point) value_t::number_float 
 
 object value_t::object 
 
 array value_t::array 
 
 binary value_t::binary 
 
 discarded value_t::discarded 
  
 
Exception safety
 
No-throw guarantee: this member function never throws exceptions.
 
Complexity
 
Constant.
 
Examples
 
 Example 
The following code exemplifies type() for all JSON types.
 
#include <iostream>
 #include <nlohmann/json.hpp>
 
@@ -35,4 +35,4 @@
 true
 true
 true
-
 
 
Version history
 
     
  • Added in version 1.0.0.
    •  
  • Added unsigned integer type in version 2.0.0.
    •  
  • Added binary type in version 3.8.0.
    •  
   
 
   
  
 
 
 
 
 
 Copyright © 2013-2025 Niels Lohmann 
 
 
             
 
 
 
 
 
 
 
     
\ No newline at end of file
+

Version history

  • Added in version 1.0.0.
  • Added unsigned integer type in version 2.0.0.
  • Added binary type in version 3.8.0.
Copyright © 2013-2025 Niels Lohmann
\ No newline at end of file diff --git a/api/basic_json/type_error/index.html b/api/basic_json/type_error/index.html index dbea9689c..2b48e50cb 100644 --- a/api/basic_json/type_error/index.html +++ b/api/basic_json/type_error/index.html @@ -1,4 +1,4 @@ - type_error - JSON for Modern C++
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nlohmann::basic_json::type_error

class type_error : public exception;
+ type_error - JSON for Modern C++      
 
 
  
 
  
 
 
 
 
  
 
 
 
 
 
  
 
 
 
 
       
nlohmann::basic_json::type_error
 
class type_error : public exception;
 
 
This exception is thrown in case of a type error; that is, a library function is executed on a JSON value whose type does not match the expected semantics.
 
Exceptions have ids 3xx (see list of type errors).
 
classDiagram
   direction LR
 
@@ -49,4 +49,4 @@
 }
 
 
Output:
 
message: [json.exception.type_error.308] cannot use push_back() with string
 exception id: 308
-
  
See also
  
Version history
 
     
  • Since version 3.0.0.
    •
Copyright © 2013-2025 Niels Lohmann
\ No newline at end of file +

See also

Version history

\ No newline at end of file diff --git a/api/basic_json/type_name/index.html b/api/basic_json/type_name/index.html index 831120cc8..33775be0c 100644 --- a/api/basic_json/type_name/index.html +++ b/api/basic_json/type_name/index.html @@ -1,4 +1,4 @@ - type_name - JSON for Modern C++
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nlohmann::basic_json::type_name

const char* type_name() const noexcept;
+ type_name - JSON for Modern C++      
 
 
  
 
  
 
 
 
 
  
 
 
 
 
 
  
 
 
 
 
       
nlohmann::basic_json::type_name
 
const char* type_name() const noexcept;
 
 
Returns the type name as string to be used in error messages -- usually to indicate that a function was called on a wrong JSON type.
 
Return value
 
a string representation of the type (value_t):
 
  
 Value type return value 
   
 null "null" 
 
 boolean "boolean" 
 
 string "string" 
 
 number (integer, unsigned integer, floating-point) "number" 
 
 object "object" 
 
 array "array" 
 
 binary "binary" 
 
 discarded "discarded" 
  
 
Exception safety
 
No-throw guarantee: this member function never throws exceptions.
 
Complexity
 
Constant.
 
Examples
 
 Example 
The following code exemplifies type_name() for all JSON types.
 
#include <iostream>
 #include <nlohmann/json.hpp>
 
@@ -34,4 +34,4 @@
 {"one":1,"two":2} is an object
 [1,2,4,8,16] is an array
 "Hello, world" is a string
-
 
 
Version history
 
     
  • Added in version 1.0.0.
    •  
  • Part of the public API version since 2.1.0.
    •  
  • Changed return value to const char* and added noexcept in version 3.0.0.
    •  
  • Added support for binary type in version 3.8.0.
    •  
   
 
   
  
 
 
 
 
 
 Copyright © 2013-2025 Niels Lohmann 
 
 
             
 
 
 
 
 
 
 
     
\ No newline at end of file
+

Version history

  • Added in version 1.0.0.
  • Part of the public API version since 2.1.0.
  • Changed return value to const char* and added noexcept in version 3.0.0.
  • Added support for binary type in version 3.8.0.
Copyright © 2013-2025 Niels Lohmann
\ No newline at end of file diff --git a/api/basic_json/unflatten/index.html b/api/basic_json/unflatten/index.html index e5cb802d7..805a157ec 100644 --- a/api/basic_json/unflatten/index.html +++ b/api/basic_json/unflatten/index.html @@ -1,4 +1,4 @@ - unflatten - JSON for Modern C++
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nlohmann::basic_json::unflatten

basic_json unflatten() const;
+ unflatten - JSON for Modern C++      
 
 
  
 
  
 
 
 
 
  
 
 
 
 
 
  
 
 
 
 
       
nlohmann::basic_json::unflatten
 
basic_json unflatten() const;
 
 
The function restores the arbitrary nesting of a JSON value that has been flattened before using the flatten() function. The JSON value must meet certain constraints:
 
     
  1. The value must be an object.
    2.  
  2. The keys must be JSON pointers (see RFC 6901)
    3.  
  3. The mapped values must be primitive JSON types.
    4.  
 
Return value
 
the original JSON from a flattened version
 
Exception safety
 
Strong exception safety: if an exception occurs, the original value stays intact.
 
Exceptions
 
The function can throw the following exceptions:
  
Complexity
 
Linear in the size of the JSON value.
 
Notes
 
Empty objects and arrays are flattened by flatten() to null values and cannot unflattened to their original type. Apart from this example, for a JSON value j, the following is always true: j == j.flatten().unflatten().
 
Examples
 
 Example 
The following code shows how a flattened JSON object is unflattened into the original nested JSON object.
 
#include <iostream>
 #include <iomanip>
 #include <nlohmann/json.hpp>
@@ -43,4 +43,4 @@
     },
     "pi": 3.141
 }
-
 
 
See also
  
Version history
 
     
  • Added in version 2.0.0.
    •  
   
 
   
  
 
 
 
 
 
 Copyright © 2013-2025 Niels Lohmann 
 
 
             
 
 
 
 
 
 
 
     
\ No newline at end of file
+

See also

Version history

  • Added in version 2.0.0.
Copyright © 2013-2025 Niels Lohmann
\ No newline at end of file diff --git a/api/basic_json/update/index.html b/api/basic_json/update/index.html index 02b069eaa..0eec3b48f 100644 --- a/api/basic_json/update/index.html +++ b/api/basic_json/update/index.html @@ -1,4 +1,4 @@ - update - JSON for Modern C++
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nlohmann::basic_json::update

// (1)
+ update - JSON for Modern C++      
 
 
  
 
  
 
 
 
 
  
 
 
 
 
 
  
 
 
 
 
       
nlohmann::basic_json::update
 
// (1)
 void update(const_reference j, bool merge_objects = false);
 
 // (2)
@@ -110,4 +110,4 @@
     "active": true,
     "name": {"de": "Maus", "en": "mouse", "es": "ratón"}
 }
-
  
Version history
 
     
  • Added in version 3.0.0.
    •  
  • Added merge_objects parameter in 3.10.5.
    •  
   
 
   
  
 
 
 
 
 
 Copyright © 2013-2025 Niels Lohmann 
 
 
             
 
 
 
 
 
 
 
     
\ No newline at end of file
+

Version history

  • Added in version 3.0.0.
  • Added merge_objects parameter in 3.10.5.
Copyright © 2013-2025 Niels Lohmann
\ No newline at end of file diff --git a/api/basic_json/value/index.html b/api/basic_json/value/index.html index fced2e125..a01952c4c 100644 --- a/api/basic_json/value/index.html +++ b/api/basic_json/value/index.html @@ -1,4 +1,4 @@ - value - JSON for Modern C++
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nlohmann::basic_json::value

// (1)
+ value - JSON for Modern C++      
 
 
  
 
  
 
 
 
 
  
 
 
 
 
 
  
 
 
 
 
       
nlohmann::basic_json::value
 
// (1)
 template<class ValueType>
 ValueType value(const typename object_t::key_type& key,
                 ValueType&& default_value) const;
@@ -136,4 +136,4 @@
               << " " << v_string << " " << v_boolean << "\n";
 }
 
 
Output:
 
1 42.23 oops false
-
  
See also
 
     
  • see at for access by reference with range checking
    •  
  • see operator[] for unchecked access by reference
    •  
 
Version history
 
     
  1. Added in version 1.0.0. Changed parameter default_value type from const ValueType& to ValueType&& in version 3.11.0.
    2.  
  2. Added in version 3.11.0. Made ValueType the first template parameter in version 3.11.2.
    3.  
  3. Added in version 2.0.2.
    4.  
   
 
   
  
 
 
 
 
 
 Copyright © 2013-2025 Niels Lohmann 
 
 
             
 
 
 
 
 
 
 
     
\ No newline at end of file
+

See also

  • see at for access by reference with range checking
  • see operator[] for unchecked access by reference

Version history

  1. Added in version 1.0.0. Changed parameter default_value type from const ValueType& to ValueType&& in version 3.11.0.
  2. Added in version 3.11.0. Made ValueType the first template parameter in version 3.11.2.
  3. Added in version 2.0.2.
Copyright © 2013-2025 Niels Lohmann
\ No newline at end of file diff --git a/api/basic_json/value_t/index.html b/api/basic_json/value_t/index.html index f028a8b97..e41299065 100644 --- a/api/basic_json/value_t/index.html +++ b/api/basic_json/value_t/index.html @@ -1,4 +1,4 @@ - value_t - JSON for Modern C++
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nlohmann::basic_json::value_t

enum class value_t : std::uint8_t {
+ value_t - JSON for Modern C++      
 
 
  
 
  
 
 
 
 
  
 
 
 
 
 
  
 
 
 
 
       
nlohmann::basic_json::value_t
 
enum class value_t : std::uint8_t {
     null,
     object,
     array,
@@ -46,4 +46,4 @@
 true
 true
 true
-
  
Version history
 
     
  • Added in version 1.0.0.
    •  
  • Added unsigned integer type in version 2.0.0.
    •  
  • Added binary type in version 3.8.0.
    •  
   
 
   
  
 
 
 
 
 
 Copyright © 2013-2025 Niels Lohmann 
 
 
             
 
 
 
 
 
 
 
     
\ No newline at end of file
+

Version history

  • Added in version 1.0.0.
  • Added unsigned integer type in version 2.0.0.
  • Added binary type in version 3.8.0.
Copyright © 2013-2025 Niels Lohmann
\ No newline at end of file diff --git a/api/basic_json/~basic_json/index.html b/api/basic_json/~basic_json/index.html index 6ad7f2526..aafb7ec69 100644 --- a/api/basic_json/~basic_json/index.html +++ b/api/basic_json/~basic_json/index.html @@ -1,2 +1,2 @@ - (Destructor) - JSON for Modern C++
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nlohmann::basic_json::~basic_json

~basic_json() noexcept;
-

Destroys the JSON value and frees all allocated memory.

Exception safety

No-throw guarantee: this member function never throws exceptions.

Complexity

Linear.

Version history

  • Added in version 1.0.0.
Copyright © 2013-2025 Niels Lohmann
\ No newline at end of file + (Destructor) - JSON for Modern C++
Skip to content

nlohmann::basic_json::~basic_json

~basic_json() noexcept;
+

Destroys the JSON value and frees all allocated memory.

Exception safety

No-throw guarantee: this member function never throws exceptions.

Complexity

Linear.

Version history

  • Added in version 1.0.0.
Copyright © 2013-2025 Niels Lohmann
\ No newline at end of file diff --git a/api/byte_container_with_subtype/byte_container_with_subtype/index.html b/api/byte_container_with_subtype/byte_container_with_subtype/index.html index 991f8a6a9..e17860bb1 100644 --- a/api/byte_container_with_subtype/byte_container_with_subtype/index.html +++ b/api/byte_container_with_subtype/byte_container_with_subtype/index.html @@ -1,4 +1,4 @@ - (constructor) - JSON for Modern C++
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nlohmann::byte_container_with_subtype::byte_container_with_subtype

// (1)
+ (constructor) - JSON for Modern C++      
 
 
  
 
  
 
 
 
 
  
 
 
 
 
 
  
 
 
 
 
       
nlohmann::byte_container_with_subtype::byte_container_with_subtype
 
// (1)
 byte_container_with_subtype();
 
 // (2)
@@ -34,4 +34,4 @@
 
 
Output:
 
{"bytes":[],"subtype":null}
 {"bytes":[202,254,186,190],"subtype":null}
 {"bytes":[202,254,186,190],"subtype":42}
-
  
Version history
 
Since version 3.8.0.
   
 
   
  
 
 
 
 
 
 Copyright © 2013-2025 Niels Lohmann 
 
 
             
 
 
 
 
 
 
 
     
\ No newline at end of file
+

Version history

Since version 3.8.0.

Copyright © 2013-2025 Niels Lohmann
\ No newline at end of file diff --git a/api/byte_container_with_subtype/clear_subtype/index.html b/api/byte_container_with_subtype/clear_subtype/index.html index d1dbdd1cf..6867d240f 100644 --- a/api/byte_container_with_subtype/clear_subtype/index.html +++ b/api/byte_container_with_subtype/clear_subtype/index.html @@ -1,4 +1,4 @@ - clear_subtype - JSON for Modern C++
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nlohmann::byte_container_with_subtype::clear_subtype

void clear_subtype() noexcept;
+ clear_subtype - JSON for Modern C++      
 
 
  
 
  
 
 
 
 
  
 
 
 
 
 
  
 
 
 
 
       
nlohmann::byte_container_with_subtype::clear_subtype
 
void clear_subtype() noexcept;
 
 
Clears the binary subtype and flags the value as not having a subtype, which has implications for serialization; for instance, MessagePack will prefer the bin family over the ext family.
 
Exception safety
 
No-throw guarantee: this function never throws exceptions.
 
Complexity
 
Constant.
 
Examples
 
 Example 
The example below demonstrates how clear_subtype can remove subtypes.
 
#include <iostream>
 #include <nlohmann/json.hpp>
 
@@ -22,4 +22,4 @@
 }
 
 
Output:
 
before calling clear_subtype(): {"bytes":[202,254,186,190],"subtype":42}
 after calling clear_subtype(): {"bytes":[202,254,186,190],"subtype":null}
-
 
 
Version history
 
Since version 3.8.0.
   
 
   
  
 
 
 
 
 
 Copyright © 2013-2025 Niels Lohmann 
 
 
             
 
 
 
 
 
 
 
     
\ No newline at end of file
+

Version history

Since version 3.8.0.

Copyright © 2013-2025 Niels Lohmann
\ No newline at end of file diff --git a/api/byte_container_with_subtype/has_subtype/index.html b/api/byte_container_with_subtype/has_subtype/index.html index 16e585a4b..1cba1c80c 100644 --- a/api/byte_container_with_subtype/has_subtype/index.html +++ b/api/byte_container_with_subtype/has_subtype/index.html @@ -1,4 +1,4 @@ - has_subtype - JSON for Modern C++
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nlohmann::byte_container_with_subtype::has_subtype

constexpr bool has_subtype() const noexcept;
+ has_subtype - JSON for Modern C++      
 
 
  
 
  
 
 
 
 
  
 
 
 
 
 
  
 
 
 
 
       
nlohmann::byte_container_with_subtype::has_subtype
 
constexpr bool has_subtype() const noexcept;
 
 
Returns whether the value has a subtype.
 
Return value
 
whether the value has a subtype
 
Exception safety
 
No-throw guarantee: this function never throws exceptions.
 
Complexity
 
Constant.
 
Examples
 
 Example 
The example below demonstrates how has_subtype can check whether a subtype was set.
 
#include <iostream>
 #include <nlohmann/json.hpp>
 
@@ -20,4 +20,4 @@
 }
 
 
Output:
 
c1.has_subtype() = false
 c2.has_subtype() = true
-
 
 
Version history
 
Since version 3.8.0.
   
 
   
  
 
 
 
 
 
 Copyright © 2013-2025 Niels Lohmann 
 
 
             
 
 
 
 
 
 
 
     
\ No newline at end of file
+

Version history

Since version 3.8.0.

Copyright © 2013-2025 Niels Lohmann
\ No newline at end of file diff --git a/api/byte_container_with_subtype/index.html b/api/byte_container_with_subtype/index.html index 4625ca5ce..dbf300d24 100644 --- a/api/byte_container_with_subtype/index.html +++ b/api/byte_container_with_subtype/index.html @@ -1,3 +1,3 @@ - Overview - JSON for Modern C++
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nlohmann::byte_container_with_subtype

template<typename BinaryType>
+ Overview - JSON for Modern C++      
 
 
  
 
  
 
 
 
 
  
 
 
 
 
 
  
 
 
 
 
       
nlohmann::byte_container_with_subtype
 
template<typename BinaryType>
 class byte_container_with_subtype : public BinaryType;
-
 
This type extends the template parameter BinaryType provided to basic_json with a subtype used by BSON and MessagePack. This type exists so that the user does not have to specify a type themselves with a specific naming scheme in order to override the binary type.
 
Template parameters
 
 
BinaryType
 
container to store bytes (std::vector<std::uint8_t> by default)
 
 
Member types
 
     
  • container_type - the type of the underlying container (BinaryType)
    •  
  • subtype_type - the type of the subtype (std::uint64_t)
    •  
 
Member functions
  
Version history
 
     
  • Added in version 3.8.0.
    •  
  • Changed the type of subtypes to std::uint64_t in 3.10.0.
    •  
   
 
   
  
 
 
 
 
 
 Copyright © 2013-2025 Niels Lohmann 
 
 
             
 
 
 
 
 
 
 
     
\ No newline at end of file
+

This type extends the template parameter BinaryType provided to basic_json with a subtype used by BSON and MessagePack. This type exists so that the user does not have to specify a type themselves with a specific naming scheme in order to override the binary type.

Template parameters

BinaryType
container to store bytes (std::vector<std::uint8_t> by default)

Member types

  • container_type - the type of the underlying container (BinaryType)
  • subtype_type - the type of the subtype (std::uint64_t)

Member functions

Version history

  • Added in version 3.8.0.
  • Changed the type of subtypes to std::uint64_t in 3.10.0.
Copyright © 2013-2025 Niels Lohmann
\ No newline at end of file diff --git a/api/byte_container_with_subtype/set_subtype/index.html b/api/byte_container_with_subtype/set_subtype/index.html index 8d7a8c038..26322e26a 100644 --- a/api/byte_container_with_subtype/set_subtype/index.html +++ b/api/byte_container_with_subtype/set_subtype/index.html @@ -1,4 +1,4 @@ - set_subtype - JSON for Modern C++
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nlohmann::byte_container_with_subtype::set_subtype

void set_subtype(subtype_type subtype) noexcept;
+ set_subtype - JSON for Modern C++      
 
 
  
 
  
 
 
 
 
  
 
 
 
 
 
  
 
 
 
 
       
nlohmann::byte_container_with_subtype::set_subtype
 
void set_subtype(subtype_type subtype) noexcept;
 
 
Sets the binary subtype of the value, also flags a binary JSON value as having a subtype, which has implications for serialization.
 
Parameters
 
 
subtype (in)
 
subtype to set
 
 
Exception safety
 
No-throw guarantee: this function never throws exceptions.
 
Complexity
 
Constant.
 
Examples
 
 Example 
The example below demonstrates how a subtype can be set with set_subtype.
 
#include <iostream>
 #include <nlohmann/json.hpp>
 
@@ -23,4 +23,4 @@
 }
 
 
Output:
 
before calling set_subtype(42): {"bytes":[202,254,186,190],"subtype":null}
 after calling set_subtype(42): {"bytes":[202,254,186,190],"subtype":42}
-
 
 
Version history
 
Since version 3.8.0.
   
 
   
  
 
 
 
 
 
 Copyright © 2013-2025 Niels Lohmann 
 
 
             
 
 
 
 
 
 
 
     
\ No newline at end of file
+

Version history

Since version 3.8.0.

Copyright © 2013-2025 Niels Lohmann
\ No newline at end of file diff --git a/api/byte_container_with_subtype/subtype/index.html b/api/byte_container_with_subtype/subtype/index.html index 2dad0d1c2..3c04e00e7 100644 --- a/api/byte_container_with_subtype/subtype/index.html +++ b/api/byte_container_with_subtype/subtype/index.html @@ -1,4 +1,4 @@ - subtype - JSON for Modern C++
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nlohmann::byte_container_with_subtype::subtype

constexpr subtype_type subtype() const noexcept;
+ subtype - JSON for Modern C++      
 
 
  
 
  
 
 
 
 
  
 
 
 
 
 
  
 
 
 
 
       
nlohmann::byte_container_with_subtype::subtype
 
constexpr subtype_type subtype() const noexcept;
 
 
Returns the numerical subtype of the value if it has a subtype. If it does not have a subtype, this function will return subtype_type(-1) as a sentinel value.
 
Return value
 
the numerical subtype of the binary value, or subtype_type(-1) if no subtype is set
 
Exception safety
 
No-throw guarantee: this function never throws exceptions.
 
Complexity
 
Constant.
 
Examples
 
 Example 
The example below demonstrates how the subtype can be retrieved with subtype. Note how subtype_type(-1) is returned for container c1.
 
#include <iostream>
 #include <nlohmann/json.hpp>
 
@@ -23,4 +23,4 @@
 }
 
 
Output:
 
c1.subtype() = 18446744073709551615
 c2.subtype() = 42
-
 
 
Version history
 
     
  • Added in version 3.8.0
    •  
  • Fixed return value to properly return subtype_type(-1) as documented in version 3.10.0.
    •  
   
 
   
  
 
 
 
 
 
 Copyright © 2013-2025 Niels Lohmann 
 
 
             
 
 
 
 
 
 
 
     
\ No newline at end of file
+

Version history

  • Added in version 3.8.0
  • Fixed return value to properly return subtype_type(-1) as documented in version 3.10.0.
Copyright © 2013-2025 Niels Lohmann
\ No newline at end of file diff --git a/api/json/index.html b/api/json/index.html index 467cf2636..567187506 100644 --- a/api/json/index.html +++ b/api/json/index.html @@ -1,4 +1,4 @@ - json - JSON for Modern C++
Skip to content

nlohmann::json

using json = basic_json<>;
+ json - JSON for Modern C++      
 
 
  
 
  
 
 
 
 
  
 
 
 
 
 
  
 
 
 
 
       
nlohmann::json
 
using json = basic_json<>;
 
 
This type is the default specialization of the basic_json class which uses the standard template types.
 
Examples
 
 Example 
The example below demonstrates how to use the type nlohmann::json.
 
#include <iostream>
 #include <iomanip>
 #include <nlohmann/json.hpp>
@@ -65,4 +65,4 @@
     "pi": 3.141,
     "size": 8
 }
-
 
 
Version history
 
Since version 1.0.0.
   
 
   
  
 
 
 
 
 
 Copyright © 2013-2025 Niels Lohmann 
 
 
             
 
 
 
 
 
 
 
     
\ No newline at end of file
+

Version history

Since version 1.0.0.

Copyright © 2013-2025 Niels Lohmann
\ No newline at end of file diff --git a/api/json_pointer/back/index.html b/api/json_pointer/back/index.html index a530b408a..0402c05ee 100644 --- a/api/json_pointer/back/index.html +++ b/api/json_pointer/back/index.html @@ -1,4 +1,4 @@ - back - JSON for Modern C++
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nlohmann::json_pointer::back

const string_t& back() const;
+ back - JSON for Modern C++      
 
 
  
 
  
 
 
 
 
  
 
 
 
 
 
  
 
 
 
 
       
nlohmann::json_pointer::back
 
const string_t& back() const;
 
 
Return the last reference token.
 
Return value
 
Last reference token.
 
Exceptions
 
Throws out_of_range.405 if the JSON pointer has no parent.
 
Complexity
 
Constant.
 
Examples
 
 Example 
The example shows the usage of back.
 
#include <iostream>
 #include <nlohmann/json.hpp>
 
@@ -16,4 +16,4 @@
 }
 
 
Output:
 
last reference token of "/foo" is "foo"
 last reference token of "/foo/0" is "0"
-
 
 
Version history
 
     
  • Added in version 3.6.0.
    •  
  • Changed return type to string_t in version 3.11.0.
    •  
   
 
   
  
 
 
 
 
 
 Copyright © 2013-2025 Niels Lohmann 
 
 
             
 
 
 
 
 
 
 
     
\ No newline at end of file
+

Version history

  • Added in version 3.6.0.
  • Changed return type to string_t in version 3.11.0.
Copyright © 2013-2025 Niels Lohmann
\ No newline at end of file diff --git a/api/json_pointer/empty/index.html b/api/json_pointer/empty/index.html index 0a812a5f6..29491faf5 100644 --- a/api/json_pointer/empty/index.html +++ b/api/json_pointer/empty/index.html @@ -1,4 +1,4 @@ - empty - JSON for Modern C++
Skip to content

nlohmann::json_pointer::empty

bool empty() const noexcept;
+ empty - JSON for Modern C++      
 
 
  
 
  
 
 
 
 
  
 
 
 
 
 
  
 
 
 
 
       
nlohmann::json_pointer::empty
 
bool empty() const noexcept;
 
 
Return whether the pointer points to the root document.
 
Return value
 
true iff the JSON pointer points to the root document.
 
Exception safety
 
No-throw guarantee: this function never throws exceptions.
 
Complexity
 
Constant.
 
Examples
 
 Example 
The example shows the result of empty for different JSON Pointers.
 
#include <iostream>
 #include <nlohmann/json.hpp>
 
@@ -23,4 +23,4 @@
 "": true
 "/foo": false
 "/foo/0": false
-
 
 
Version history
 
Added in version 3.6.0.
   
 
   
  
 
 
 
 
 
 Copyright © 2013-2025 Niels Lohmann 
 
 
             
 
 
 
 
 
 
 
     
\ No newline at end of file
+

Version history

Added in version 3.6.0.

Copyright © 2013-2025 Niels Lohmann
\ No newline at end of file diff --git a/api/json_pointer/index.html b/api/json_pointer/index.html index fb901cc7e..04088066e 100644 --- a/api/json_pointer/index.html +++ b/api/json_pointer/index.html @@ -1,3 +1,3 @@ - Overview - JSON for Modern C++
Skip to content

nlohmann::json_pointer

template<typename RefStringType>
+ Overview - JSON for Modern C++      
 
 
  
 
  
 
 
 
 
  
 
 
 
 
 
  
 
 
 
 
       
nlohmann::json_pointer
 
template<typename RefStringType>
 class json_pointer;
-
 
A JSON pointer defines a string syntax for identifying a specific value within a JSON document. It can be used with functions at and operator[]. Furthermore, JSON pointers are the base for JSON patches.
 
Template parameters
 
 
RefStringType
 
the string type used for the reference tokens making up the JSON pointer
 
 
 
Deprecation
 
For backwards compatibility RefStringType may also be a specialization of basic_json in which case string_t will be deduced as basic_json::string_t. This feature is deprecated and may be removed in a future major version.
 
 
Member types
 
     
  • string_t - the string type used for the reference tokens
    •  
 
Member functions
  
Literals
  
See also
  
Version history
 
     
  • Added in version 2.0.0.
    •  
  • Changed template parameter from basic_json to string type in version 3.11.0.
    •  
   
 
   
  
 
 
 
 
 
 Copyright © 2013-2025 Niels Lohmann 
 
 
             
 
 
 
 
 
 
 
     
\ No newline at end of file
+

A JSON pointer defines a string syntax for identifying a specific value within a JSON document. It can be used with functions at and operator[]. Furthermore, JSON pointers are the base for JSON patches.

Template parameters

RefStringType
the string type used for the reference tokens making up the JSON pointer

Deprecation

For backwards compatibility RefStringType may also be a specialization of basic_json in which case string_t will be deduced as basic_json::string_t. This feature is deprecated and may be removed in a future major version.

Member types

  • string_t - the string type used for the reference tokens

Member functions

Literals

See also

Version history

  • Added in version 2.0.0.
  • Changed template parameter from basic_json to string type in version 3.11.0.
Copyright © 2013-2025 Niels Lohmann
\ No newline at end of file diff --git a/api/json_pointer/json_pointer/index.html b/api/json_pointer/json_pointer/index.html index 174027988..48815c959 100644 --- a/api/json_pointer/json_pointer/index.html +++ b/api/json_pointer/json_pointer/index.html @@ -1,4 +1,4 @@ - (Constructor) - JSON for Modern C++
Skip to content

nlohmann::json_pointer::json_pointer

explicit json_pointer(const string_t& s = "");
+ (Constructor) - JSON for Modern C++      
 
 
  
 
  
 
 
 
 
  
 
 
 
 
 
  
 
 
 
 
       
nlohmann::json_pointer::json_pointer
 
explicit json_pointer(const string_t& s = "");
 
 
Create a JSON pointer according to the syntax described in Section 3 of RFC6901.
 
Parameters
 
 
s (in)
 
string representing the JSON pointer; if omitted, the empty string is assumed which references the whole JSON value
 
 
Exceptions
 
     
  • Throws parse_error.107 if the given JSON pointer s is nonempty and does not begin with a slash (/); see example below.
    •  
  • Throws parse_error.108 if a tilde (~) in the given JSON pointer s is not followed by 0 (representing ~) or 1 (representing /); see example below.
    •  
 
Examples
 
 Example 
The example shows the construction several valid JSON pointers as well as the exceptional behavior.
 
#include <iostream>
 #include <nlohmann/json.hpp>
 
@@ -49,4 +49,4 @@
 
 
Output:
 
[json.exception.parse_error.107] parse error at byte 1: JSON pointer must be empty or begin with '/' - was: 'foo'
 [json.exception.parse_error.108] parse error: escape character '~' must be followed with '0' or '1'
 [json.exception.parse_error.108] parse error: escape character '~' must be followed with '0' or '1'
-
 
 
Version history
 
     
  • Added in version 2.0.0.
    •  
  • Changed type of s to string_t in version 3.11.0.
    •  
   
 
   
  
 
 
 
 
 
 Copyright © 2013-2025 Niels Lohmann 
 
 
             
 
 
 
 
 
 
 
     
\ No newline at end of file
+

Version history

  • Added in version 2.0.0.
  • Changed type of s to string_t in version 3.11.0.
Copyright © 2013-2025 Niels Lohmann
\ No newline at end of file diff --git a/api/json_pointer/operator_eq/index.html b/api/json_pointer/operator_eq/index.html index f4ef55320..690a9547e 100644 --- a/api/json_pointer/operator_eq/index.html +++ b/api/json_pointer/operator_eq/index.html @@ -1,4 +1,4 @@ - operator== - JSON for Modern C++
Skip to content

nlohmann::json_pointer::operator==

// until C++20
+ operator== - JSON for Modern C++      
 
 
  
 
  
 
 
 
 
  
 
 
 
 
 
  
 
 
 
 
       
nlohmann::json_pointer::operator==
 
// until C++20
 template<typename RefStringTypeLhs, typename RefStringTypeRhs>
 bool operator==(
     const json_pointer<RefStringTypeLhs>& lhs,
@@ -82,4 +82,4 @@
 "" == "": true
 "/foo" == "/foo": true
 "bar" == "/foo": [json.exception.parse_error.107] parse error at byte 1: JSON pointer must be empty or begin with '/' - was: 'bar'
-
  
Version history
 
     
  1. Added in version 2.1.0. Added C++20 member functions in version 3.11.2.
    2.  
  2. Added for backward compatibility and deprecated in version 3.11.2.
    3.  
   
 
   
  
 
 
 
 
 
 Copyright © 2013-2025 Niels Lohmann 
 
 
             
 
 
 
 
 
 
 
     
\ No newline at end of file
+

Version history

  1. Added in version 2.1.0. Added C++20 member functions in version 3.11.2.
  2. Added for backward compatibility and deprecated in version 3.11.2.
Copyright © 2013-2025 Niels Lohmann
\ No newline at end of file diff --git a/api/json_pointer/operator_ne/index.html b/api/json_pointer/operator_ne/index.html index eb8694b71..fa6f1e926 100644 --- a/api/json_pointer/operator_ne/index.html +++ b/api/json_pointer/operator_ne/index.html @@ -1,4 +1,4 @@ - operator!= - JSON for Modern C++
Skip to content

nlohmann::json_pointer::operator!=

// until C++20
+ operator!= - JSON for Modern C++      
 
 
  
 
  
 
 
 
 
  
 
 
 
 
 
  
 
 
 
 
       
nlohmann::json_pointer::operator!=
 
// until C++20
 template<typename RefStringTypeLhs, typename RefStringTypeRhs>
 bool operator!=(
     const json_pointer<RefStringTypeLhs>& lhs,
@@ -72,4 +72,4 @@
 "" != "": false
 "/foo" != "/foo": false
 "bar" != "/foo": [json.exception.parse_error.107] parse error at byte 1: JSON pointer must be empty or begin with '/' - was: 'bar'
-
  
Version history
 
     
  1. Added in version 2.1.0.
    2.  
  2. Added for backward compatibility and deprecated in version 3.11.2.
    3.  
   
 
   
  
 
 
 
 
 
 Copyright © 2013-2025 Niels Lohmann 
 
 
             
 
 
 
 
 
 
 
     
\ No newline at end of file
+

Version history

  1. Added in version 2.1.0.
  2. Added for backward compatibility and deprecated in version 3.11.2.
Copyright © 2013-2025 Niels Lohmann
\ No newline at end of file diff --git a/api/json_pointer/operator_slash/index.html b/api/json_pointer/operator_slash/index.html index 7ba2c449c..f16d8eb27 100644 --- a/api/json_pointer/operator_slash/index.html +++ b/api/json_pointer/operator_slash/index.html @@ -1,4 +1,4 @@ - operator/ - JSON for Modern C++
Skip to content

nlohmann::json_pointer::operator/

// (1)
+ operator/ - JSON for Modern C++      
 
 
  
 
  
 
 
 
 
  
 
 
 
 
 
  
 
 
 
 
       
nlohmann::json_pointer::operator/
 
// (1)
 json_pointer operator/(const json_pointer& lhs, const json_pointer& rhs);
 
 // (2)
@@ -28,4 +28,4 @@
 
 
Output:
 
"/foo/bar/baz"
 "/foo/fob"
 "/foo/42"
-
  
Version history
 
     
  1. Added in version 3.6.0.
    2.  
  2. Added in version 3.6.0. Changed type of token to string_t in version 3.11.0.
    3.  
  3. Added in version 3.6.0.
    4.  
   
 
   
  
 
 
 
 
 
 Copyright © 2013-2025 Niels Lohmann 
 
 
             
 
 
 
 
 
 
 
     
\ No newline at end of file
+

Version history

  1. Added in version 3.6.0.
  2. Added in version 3.6.0. Changed type of token to string_t in version 3.11.0.
  3. Added in version 3.6.0.
Copyright © 2013-2025 Niels Lohmann
\ No newline at end of file diff --git a/api/json_pointer/operator_slasheq/index.html b/api/json_pointer/operator_slasheq/index.html index df0702fcb..99aabc1a9 100644 --- a/api/json_pointer/operator_slasheq/index.html +++ b/api/json_pointer/operator_slasheq/index.html @@ -1,4 +1,4 @@ - operator/= - JSON for Modern C++
Skip to content

nlohmann::json_pointer::operator/=

// (1)
+ operator/= - JSON for Modern C++      
 
 
  
 
  
 
 
 
 
  
 
 
 
 
 
  
 
 
 
 
       
nlohmann::json_pointer::operator/=
 
// (1)
 json_pointer& operator/=(const json_pointer& ptr);
 
 // (2)
@@ -33,4 +33,4 @@
 "/foo/bar/baz"
 "/foo/bar/baz/fob"
 "/foo/bar/baz/fob/42"
-
  
Version history
 
     
  1. Added in version 3.6.0.
    2.  
  2. Added in version 3.6.0. Changed type of token to string_t in version 3.11.0.
    3.  
  3. Added in version 3.6.0.
    4.  
   
 
   
  
 
 
 
 
 
 Copyright © 2013-2025 Niels Lohmann 
 
 
             
 
 
 
 
 
 
 
     
\ No newline at end of file
+

Version history

  1. Added in version 3.6.0.
  2. Added in version 3.6.0. Changed type of token to string_t in version 3.11.0.
  3. Added in version 3.6.0.
Copyright © 2013-2025 Niels Lohmann
\ No newline at end of file diff --git a/api/json_pointer/operator_string_t/index.html b/api/json_pointer/operator_string_t/index.html index 62185d215..a08eafc35 100644 --- a/api/json_pointer/operator_string_t/index.html +++ b/api/json_pointer/operator_string_t/index.html @@ -1,4 +1,4 @@ - operator string_t - JSON for Modern C++
Skip to content

nlohmann::json_pointer::operator string_t

operator string_t() const
+ operator string_t - JSON for Modern C++      
 
 
  
 
  
 
 
 
 
  
 
 
 
 
 
  
 
 
 
 
       
nlohmann::json_pointer::operator string_t
 
operator string_t() const
 
 
Return a string representation of the JSON pointer.
 
Return value
 
A string representation of the JSON pointer
 
Possible implementation
 
operator string_t() const
 {
     return to_string();
@@ -24,4 +24,4 @@
 }
 
 
Output:
 
/foo/0
 /a~1b
-
  
See also
  
Version history
 
     
  • Since version 2.0.0.
    •  
  • Changed type to string_t and deprecated in version 3.11.0.
    •  
   
 
   
  
 
 
 
 
 
 Copyright © 2013-2025 Niels Lohmann 
 
 
             
 
 
 
 
 
 
 
     
\ No newline at end of file
+

See also

Version history

  • Since version 2.0.0.
  • Changed type to string_t and deprecated in version 3.11.0.
Copyright © 2013-2025 Niels Lohmann
\ No newline at end of file diff --git a/api/json_pointer/parent_pointer/index.html b/api/json_pointer/parent_pointer/index.html index 07803326a..3deabc1d8 100644 --- a/api/json_pointer/parent_pointer/index.html +++ b/api/json_pointer/parent_pointer/index.html @@ -1,4 +1,4 @@ - parent_pointer - JSON for Modern C++
Skip to content

nlohmann::json_pointer::parent_pointer

json_pointer parent_pointer() const;
+ parent_pointer - JSON for Modern C++      
 
 
  
 
  
 
 
 
 
  
 
 
 
 
 
  
 
 
 
 
       
nlohmann::json_pointer::parent_pointer
 
json_pointer parent_pointer() const;
 
 
Returns the parent of this JSON pointer.
 
Return value
 
Parent of this JSON pointer; in case this JSON pointer is the root, the root itself is returned.
 
Complexity
 
Linear in the length of the JSON pointer.
 
Examples
 
 Example 
The example shows the result of parent_pointer for different JSON Pointers.
 
#include <iostream>
 #include <nlohmann/json.hpp>
 
@@ -20,4 +20,4 @@
 
 
Output:
 
parent of "" is ""
 parent of "/foo" is ""
 parent of "/foo/0" is "/foo"
-
 
 
Version history
 
Added in version 3.6.0.
   
 
   
  
 
 
 
 
 
 Copyright © 2013-2025 Niels Lohmann 
 
 
             
 
 
 
 
 
 
 
     
\ No newline at end of file
+

Version history

Added in version 3.6.0.

Copyright © 2013-2025 Niels Lohmann
\ No newline at end of file diff --git a/api/json_pointer/pop_back/index.html b/api/json_pointer/pop_back/index.html index 938ef68cc..9f0355e9d 100644 --- a/api/json_pointer/pop_back/index.html +++ b/api/json_pointer/pop_back/index.html @@ -1,4 +1,4 @@ - pop_back - JSON for Modern C++
Skip to content

nlohmann::json_pointer::pop_back

void pop_back();
+ pop_back - JSON for Modern C++      
 
 
  
 
  
 
 
 
 
  
 
 
 
 
 
  
 
 
 
 
       
nlohmann::json_pointer::pop_back
 
void pop_back();
 
 
Remove the last reference token.
 
Exceptions
 
Throws out_of_range.405 if the JSON pointer has no parent.
 
Complexity
 
Constant.
 
Examples
 
 Example 
The example shows the usage of pop_back.
 
#include <iostream>
 #include <nlohmann/json.hpp>
 
@@ -24,4 +24,4 @@
 "/foo/bar"
 "/foo"
 ""
-
 
 
Version history
 
Added in version 3.6.0.
   
 
   
  
 
 
 
 
 
 Copyright © 2013-2025 Niels Lohmann 
 
 
             
 
 
 
 
 
 
 
     
\ No newline at end of file
+

Version history

Added in version 3.6.0.

Copyright © 2013-2025 Niels Lohmann
\ No newline at end of file diff --git a/api/json_pointer/push_back/index.html b/api/json_pointer/push_back/index.html index 236241b90..bc98e5517 100644 --- a/api/json_pointer/push_back/index.html +++ b/api/json_pointer/push_back/index.html @@ -1,4 +1,4 @@ - push_back - JSON for Modern C++
Skip to content

nlohmann::json_pointer::push_back

void push_back(const string_t& token);
+ push_back - JSON for Modern C++      
 
 
  
 
  
 
 
 
 
  
 
 
 
 
 
  
 
 
 
 
       
nlohmann::json_pointer::push_back
 
void push_back(const string_t& token);
 
 void push_back(string_t&& token);
 
 
Append an unescaped token at the end of the reference pointer.
 
Parameters
 
 
token (in)
 
token to add
 
 
Complexity
 
Amortized constant.
 
Examples
 
 Example 
The example shows the result of push_back for different JSON Pointers.
 
#include <iostream>
@@ -26,4 +26,4 @@
 "/foo"
 "/foo/0"
 "/foo/0/bar"
-
 
 
Version history
 
     
  • Added in version 3.6.0.
    •  
  • Changed type of token to string_t in version 3.11.0.
    •  
   
 
   
  
 
 
 
 
 
 Copyright © 2013-2025 Niels Lohmann 
 
 
             
 
 
 
 
 
 
 
     
\ No newline at end of file
+

Version history

  • Added in version 3.6.0.
  • Changed type of token to string_t in version 3.11.0.
Copyright © 2013-2025 Niels Lohmann
\ No newline at end of file diff --git a/api/json_pointer/string_t/index.html b/api/json_pointer/string_t/index.html index fefc39aa0..caf59593d 100644 --- a/api/json_pointer/string_t/index.html +++ b/api/json_pointer/string_t/index.html @@ -1,4 +1,4 @@ - string_t - JSON for Modern C++
Skip to content

nlohmann::json_pointer::string_t

using string_t = RefStringType;
+ string_t - JSON for Modern C++      
 
 
  
 
  
 
 
 
 
  
 
 
 
 
 
  
 
 
 
 
       
nlohmann::json_pointer::string_t
 
using string_t = RefStringType;
 
 
The string type used for the reference tokens making up the JSON pointer.
 
See basic_json::string_t for more information.
 
Examples
 
 Example 
The example shows the type string_t and its relation to basic_json::string_t.
 
#include <iostream>
 #include <nlohmann/json.hpp>
 
@@ -14,4 +14,4 @@
 }
 
 
Output:
 
This is a string.
 true
-
 
 
Version history
 
     
  • Added in version 3.11.0.
    •  
   
 
   
  
 
 
 
 
 
 Copyright © 2013-2025 Niels Lohmann 
 
 
             
 
 
 
 
 
 
 
     
\ No newline at end of file
+

Version history

  • Added in version 3.11.0.
Copyright © 2013-2025 Niels Lohmann
\ No newline at end of file diff --git a/api/json_pointer/to_string/index.html b/api/json_pointer/to_string/index.html index 786b652cb..59cb88c62 100644 --- a/api/json_pointer/to_string/index.html +++ b/api/json_pointer/to_string/index.html @@ -1,4 +1,4 @@ - to_string - JSON for Modern C++
Skip to content

nlohmann::json_pointer::to_string

string_t to_string() const;
+ to_string - JSON for Modern C++      
 
 
  
 
  
 
 
 
 
  
 
 
 
 
 
  
 
 
 
 
       
nlohmann::json_pointer::to_string
 
string_t to_string() const;
 
 
Return a string representation of the JSON pointer.
 
Return value
 
A string representation of the JSON pointer
 
Notes
 
For each JSON pointer ptr, it holds:
 
ptr == json_pointer(ptr.to_string());
 
 
Examples
 
 Example 
The example shows the result of to_string.
 
#include <iostream>
 #include <nlohmann/json.hpp>
@@ -46,4 +46,4 @@
 "/k"l"
 "/ "
 "/m~0n"
-
 
 
Version history
 
     
  • Since version 2.0.0.
    •  
  • Changed return type to string_t in version 3.11.0.
    •  
   
 
   
  
 
 
 
 
 
 Copyright © 2013-2025 Niels Lohmann 
 
 
             
 
 
 
 
 
 
 
     
\ No newline at end of file
+

Version history

  • Since version 2.0.0.
  • Changed return type to string_t in version 3.11.0.
Copyright © 2013-2025 Niels Lohmann
\ No newline at end of file diff --git a/api/json_sax/binary/index.html b/api/json_sax/binary/index.html index 8e4dc45b8..87a6b3baf 100644 --- a/api/json_sax/binary/index.html +++ b/api/json_sax/binary/index.html @@ -1,4 +1,4 @@ - binary - JSON for Modern C++
Skip to content

nlohmann::json_sax::binary

virtual bool binary(binary_t& val) = 0;
+ binary - JSON for Modern C++      
 
 
  
 
  
 
 
 
 
  
 
 
 
 
 
  
 
 
 
 
       
nlohmann::json_sax::binary
 
virtual bool binary(binary_t& val) = 0;
 
 
A binary value was read.
 
Parameters
 
 
val (in)
 
binary value
 
 
Return value
 
Whether parsing should proceed.
 
Notes
 
It is safe to move the passed binary value.
 
Examples
 
 Example 
The example below shows how the SAX interface is used.
 
#include <iostream>
 #include <iomanip>
 #include <sstream>
@@ -116,4 +116,4 @@
 
 
Output:
 
binary(val=[...])
 
 result: true
-
 
 
Version history
 
     
  • Added in version 3.8.0.
    •  
   
 
   
  
 
 
 
 
 
 Copyright © 2013-2025 Niels Lohmann 
 
 
             
 
 
 
 
 
 
 
     
\ No newline at end of file
+

Version history

  • Added in version 3.8.0.
Copyright © 2013-2025 Niels Lohmann
\ No newline at end of file diff --git a/api/json_sax/boolean/index.html b/api/json_sax/boolean/index.html index 1f622b7bf..e24a12b74 100644 --- a/api/json_sax/boolean/index.html +++ b/api/json_sax/boolean/index.html @@ -1,4 +1,4 @@ - boolean - JSON for Modern C++
Skip to content

nlohmann::json_sax::boolean

virtual bool boolean(bool val) = 0;
+ boolean - JSON for Modern C++      
 
 
  
 
  
 
 
 
 
  
 
 
 
 
 
  
 
 
 
 
       
nlohmann::json_sax::boolean
 
virtual bool boolean(bool val) = 0;
 
 
A boolean value was read.
 
Parameters
 
 
val (in)
 
boolean value
 
 
Return value
 
Whether parsing should proceed.
 
Examples
 
 Example 
The example below shows how the SAX interface is used.
 
#include <iostream>
 #include <iomanip>
 #include <sstream>
@@ -167,4 +167,4 @@
             ex=[json.exception.parse_error.101] parse error at line 17, column 6: syntax error while parsing value - unexpected ']'; expected end of input)
 
 result: false
-
 
 
Version history
 
     
  • Added in version 3.2.0.
    •  
   
 
   
  
 
 
 
 
 
 Copyright © 2013-2025 Niels Lohmann 
 
 
             
 
 
 
 
 
 
 
     
\ No newline at end of file
+

Version history

  • Added in version 3.2.0.
Copyright © 2013-2025 Niels Lohmann
\ No newline at end of file diff --git a/api/json_sax/end_array/index.html b/api/json_sax/end_array/index.html index 00fc11492..595aa02cd 100644 --- a/api/json_sax/end_array/index.html +++ b/api/json_sax/end_array/index.html @@ -1,4 +1,4 @@ - end_array - JSON for Modern C++
Skip to content

nlohmann::json_sax::end_array

virtual bool end_array() = 0;
+ end_array - JSON for Modern C++      
 
 
  
 
  
 
 
 
 
  
 
 
 
 
 
  
 
 
 
 
       
nlohmann::json_sax::end_array
 
virtual bool end_array() = 0;
 
 
The end of an array was read.
 
Return value
 
Whether parsing should proceed.
 
Examples
 
 Example 
The example below shows how the SAX interface is used.
 
#include <iostream>
 #include <iomanip>
 #include <sstream>
@@ -167,4 +167,4 @@
             ex=[json.exception.parse_error.101] parse error at line 17, column 6: syntax error while parsing value - unexpected ']'; expected end of input)
 
 result: false
-
 
 
Version history
 
     
  • Added in version 3.2.0.
    •  
   
 
   
  
 
 
 
 
 
 Copyright © 2013-2025 Niels Lohmann 
 
 
             
 
 
 
 
 
 
 
     
\ No newline at end of file
+

Version history

  • Added in version 3.2.0.
Copyright © 2013-2025 Niels Lohmann
\ No newline at end of file diff --git a/api/json_sax/end_object/index.html b/api/json_sax/end_object/index.html index a0a575f54..ae3c1c084 100644 --- a/api/json_sax/end_object/index.html +++ b/api/json_sax/end_object/index.html @@ -1,4 +1,4 @@ - end_object - JSON for Modern C++
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nlohmann::json_sax::end_object

virtual bool end_object() = 0;
+ end_object - JSON for Modern C++      
 
 
  
 
  
 
 
 
 
  
 
 
 
 
 
  
 
 
 
 
       
nlohmann::json_sax::end_object
 
virtual bool end_object() = 0;
 
 
The end of an object was read.
 
Return value
 
Whether parsing should proceed.
 
Examples
 
 Example 
The example below shows how the SAX interface is used.
 
#include <iostream>
 #include <iomanip>
 #include <sstream>
@@ -167,4 +167,4 @@
             ex=[json.exception.parse_error.101] parse error at line 17, column 6: syntax error while parsing value - unexpected ']'; expected end of input)
 
 result: false
-
 
 
Version history
 
     
  • Added in version 3.2.0.
    •  
   
 
   
  
 
 
 
 
 
 Copyright © 2013-2025 Niels Lohmann 
 
 
             
 
 
 
 
 
 
 
     
\ No newline at end of file
+

Version history

  • Added in version 3.2.0.
Copyright © 2013-2025 Niels Lohmann
\ No newline at end of file diff --git a/api/json_sax/index.html b/api/json_sax/index.html index 917405d41..62e54f2fd 100644 --- a/api/json_sax/index.html +++ b/api/json_sax/index.html @@ -1,3 +1,3 @@ - Overview - JSON for Modern C++
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nlohmann::json_sax

template<typename BasicJsonType>
+ Overview - JSON for Modern C++      
 
 
  
 
  
 
 
 
 
  
 
 
 
 
 
  
 
 
 
 
       
nlohmann::json_sax
 
template<typename BasicJsonType>
 struct json_sax;
-
 
This class describes the SAX interface used by sax_parse. Each function is called in different situations while the input is parsed. The boolean return value informs the parser whether to continue processing the input.
 
Template parameters
 
 
BasicJsonType
 
a specialization of basic_json
 
 
Member types
  
Member functions
 
     
  • binary (virtual) - a binary value was read
    •  
  • boolean (virtual) - a boolean value was read
    •  
  • end_array (virtual) - the end of an array was read
    •  
  • end_object (virtual) - the end of an object was read
    •  
  • key (virtual) - an object key was read
    •  
  • null (virtual) - a null value was read
    •  
  • number_float (virtual) - a floating-point number was read
    •  
  • number_integer (virtual) - an integer number was read
    •  
  • number_unsigned (virtual) - an unsigned integer number was read
    •  
  • parse_error (virtual) - a parse error occurred
    •  
  • start_array (virtual) - the beginning of an array was read
    •  
  • start_object (virtual) - the beginning of an object was read
    •  
  • string (virtual) - a string value was read
    •  
 
Version history
 
     
  • Added in version 3.2.0.
    •  
  • Support for binary values (binary_t, binary) added in version 3.8.0.
    •  
   
 
   
  
 
 
 
 
 
 Copyright © 2013-2025 Niels Lohmann 
 
 
             
 
 
 
 
 
 
 
     
\ No newline at end of file
+

This class describes the SAX interface used by sax_parse. Each function is called in different situations while the input is parsed. The boolean return value informs the parser whether to continue processing the input.

Template parameters

BasicJsonType
a specialization of basic_json

Member types

Member functions

  • binary (virtual) - a binary value was read
  • boolean (virtual) - a boolean value was read
  • end_array (virtual) - the end of an array was read
  • end_object (virtual) - the end of an object was read
  • key (virtual) - an object key was read
  • null (virtual) - a null value was read
  • number_float (virtual) - a floating-point number was read
  • number_integer (virtual) - an integer number was read
  • number_unsigned (virtual) - an unsigned integer number was read
  • parse_error (virtual) - a parse error occurred
  • start_array (virtual) - the beginning of an array was read
  • start_object (virtual) - the beginning of an object was read
  • string (virtual) - a string value was read

Version history

  • Added in version 3.2.0.
  • Support for binary values (binary_t, binary) added in version 3.8.0.
Copyright © 2013-2025 Niels Lohmann
\ No newline at end of file diff --git a/api/json_sax/key/index.html b/api/json_sax/key/index.html index 393b2b2f3..9a90fed9a 100644 --- a/api/json_sax/key/index.html +++ b/api/json_sax/key/index.html @@ -1,4 +1,4 @@ - key - JSON for Modern C++
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nlohmann::json_sax::key

virtual bool key(string_t& val) = 0;
+ key - JSON for Modern C++      
 
 
  
 
  
 
 
 
 
  
 
 
 
 
 
  
 
 
 
 
       
nlohmann::json_sax::key
 
virtual bool key(string_t& val) = 0;
 
 
An object key was read.
 
Parameters
 
 
val (in)
 
object key
 
 
Return value
 
Whether parsing should proceed.
 
Notes
 
It is safe to move the passed object key value.
 
Examples
 
 Example 
The example below shows how the SAX interface is used.
 
#include <iostream>
 #include <iomanip>
 #include <sstream>
@@ -167,4 +167,4 @@
             ex=[json.exception.parse_error.101] parse error at line 17, column 6: syntax error while parsing value - unexpected ']'; expected end of input)
 
 result: false
-
 
 
Version history
 
     
  • Added in version 3.2.0.
    •  
   
 
   
  
 
 
 
 
 
 Copyright © 2013-2025 Niels Lohmann 
 
 
             
 
 
 
 
 
 
 
     
\ No newline at end of file
+

Version history

  • Added in version 3.2.0.
Copyright © 2013-2025 Niels Lohmann
\ No newline at end of file diff --git a/api/json_sax/null/index.html b/api/json_sax/null/index.html index 9156c698f..3145f7690 100644 --- a/api/json_sax/null/index.html +++ b/api/json_sax/null/index.html @@ -1,4 +1,4 @@ - null - JSON for Modern C++
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nlohmann::json_sax::null

virtual bool null() = 0;
+ null - JSON for Modern C++      
 
 
  
 
  
 
 
 
 
  
 
 
 
 
 
  
 
 
 
 
       
nlohmann::json_sax::null
 
virtual bool null() = 0;
 
 
A null value was read.
 
Return value
 
Whether parsing should proceed.
 
Examples
 
 Example 
The example below shows how the SAX interface is used.
 
#include <iostream>
 #include <iomanip>
 #include <sstream>
@@ -167,4 +167,4 @@
             ex=[json.exception.parse_error.101] parse error at line 17, column 6: syntax error while parsing value - unexpected ']'; expected end of input)
 
 result: false
-
 
 
Version history
 
     
  • Added in version 3.2.0.
    •  
   
 
   
  
 
 
 
 
 
 Copyright © 2013-2025 Niels Lohmann 
 
 
             
 
 
 
 
 
 
 
     
\ No newline at end of file
+

Version history

  • Added in version 3.2.0.
Copyright © 2013-2025 Niels Lohmann
\ No newline at end of file diff --git a/api/json_sax/number_float/index.html b/api/json_sax/number_float/index.html index c3a4f5a9f..7552cf05f 100644 --- a/api/json_sax/number_float/index.html +++ b/api/json_sax/number_float/index.html @@ -1,4 +1,4 @@ - number_float - JSON for Modern C++
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nlohmann::json_sax::number_float

virtual bool number_float(number_float_t val, const string_t& s) = 0;
+ number_float - JSON for Modern C++      
 
 
  
 
  
 
 
 
 
  
 
 
 
 
 
  
 
 
 
 
       
nlohmann::json_sax::number_float
 
virtual bool number_float(number_float_t val, const string_t& s) = 0;
 
 
A floating-point number was read.
 
Parameters
 
 
val (in)
 
floating-point value
 
s (in)
 
string representation of the original input
 
 
Return value
 
Whether parsing should proceed.
 
Examples
 
 Example 
The example below shows how the SAX interface is used.
 
#include <iostream>
 #include <iomanip>
 #include <sstream>
@@ -167,4 +167,4 @@
             ex=[json.exception.parse_error.101] parse error at line 17, column 6: syntax error while parsing value - unexpected ']'; expected end of input)
 
 result: false
-
 
 
Version history
 
     
  • Added in version 3.2.0.
    •  
   
 
   
  
 
 
 
 
 
 Copyright © 2013-2025 Niels Lohmann 
 
 
             
 
 
 
 
 
 
 
     
\ No newline at end of file
+

Version history

  • Added in version 3.2.0.
Copyright © 2013-2025 Niels Lohmann
\ No newline at end of file diff --git a/api/json_sax/number_integer/index.html b/api/json_sax/number_integer/index.html index 1dede5309..72f0cd6c2 100644 --- a/api/json_sax/number_integer/index.html +++ b/api/json_sax/number_integer/index.html @@ -1,4 +1,4 @@ - number_integer - JSON for Modern C++
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nlohmann::json_sax::number_integer

virtual bool number_integer(number_integer_t val) = 0;
+ number_integer - JSON for Modern C++      
 
 
  
 
  
 
 
 
 
  
 
 
 
 
 
  
 
 
 
 
       
nlohmann::json_sax::number_integer
 
virtual bool number_integer(number_integer_t val) = 0;
 
 
An integer number was read.
 
Parameters
 
 
val (in)
 
integer value
 
 
Return value
 
Whether parsing should proceed.
 
Examples
 
 Example 
The example below shows how the SAX interface is used.
 
#include <iostream>
 #include <iomanip>
 #include <sstream>
@@ -167,4 +167,4 @@
             ex=[json.exception.parse_error.101] parse error at line 17, column 6: syntax error while parsing value - unexpected ']'; expected end of input)
 
 result: false
-
 
 
Version history
 
     
  • Added in version 3.2.0.
    •  
   
 
   
  
 
 
 
 
 
 Copyright © 2013-2025 Niels Lohmann 
 
 
             
 
 
 
 
 
 
 
     
\ No newline at end of file
+

Version history

  • Added in version 3.2.0.
Copyright © 2013-2025 Niels Lohmann
\ No newline at end of file diff --git a/api/json_sax/number_unsigned/index.html b/api/json_sax/number_unsigned/index.html index 9559aee68..78b843d3f 100644 --- a/api/json_sax/number_unsigned/index.html +++ b/api/json_sax/number_unsigned/index.html @@ -1,4 +1,4 @@ - number_unsigned - JSON for Modern C++
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nlohmann::json_sax::number_unsigned

virtual bool number_unsigned(number_unsigned_t val) = 0;
+ number_unsigned - JSON for Modern C++      
 
 
  
 
  
 
 
 
 
  
 
 
 
 
 
  
 
 
 
 
       
nlohmann::json_sax::number_unsigned
 
virtual bool number_unsigned(number_unsigned_t val) = 0;
 
 
An unsigned integer number was read.
 
Parameters
 
 
val (in)
 
unsigned integer value
 
 
Return value
 
Whether parsing should proceed.
 
Examples
 
 Example 
The example below shows how the SAX interface is used.
 
#include <iostream>
 #include <iomanip>
 #include <sstream>
@@ -167,4 +167,4 @@
             ex=[json.exception.parse_error.101] parse error at line 17, column 6: syntax error while parsing value - unexpected ']'; expected end of input)
 
 result: false
-
 
 
Version history
 
     
  • Added in version 3.2.0.
    •  
   
 
   
  
 
 
 
 
 
 Copyright © 2013-2025 Niels Lohmann 
 
 
             
 
 
 
 
 
 
 
     
\ No newline at end of file
+

Version history

  • Added in version 3.2.0.
Copyright © 2013-2025 Niels Lohmann
\ No newline at end of file diff --git a/api/json_sax/parse_error/index.html b/api/json_sax/parse_error/index.html index 36628e97b..13e6e07eb 100644 --- a/api/json_sax/parse_error/index.html +++ b/api/json_sax/parse_error/index.html @@ -1,4 +1,4 @@ - parse_error - JSON for Modern C++
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nlohmann::json_sax::parse_error

virtual bool parse_error(std::size_t position,
+ parse_error - JSON for Modern C++      
 
 
  
 
  
 
 
 
 
  
 
 
 
 
 
  
 
 
 
 
       
nlohmann::json_sax::parse_error
 
virtual bool parse_error(std::size_t position,
                          const std::string& last_token,
                          const detail::exception& ex) = 0;
 
 
A parse error occurred.
 
Parameters
 
 
position (in)
 
the position in the input where the error occurs
 
last_token (in)
 
the last read token
 
ex (in)
 
an exception object describing the error
 
 
Return value
 
Whether parsing should proceed (must return false).
 
Examples
 
 Example 
The example below shows how the SAX interface is used.
 
#include <iostream>
@@ -169,4 +169,4 @@
             ex=[json.exception.parse_error.101] parse error at line 17, column 6: syntax error while parsing value - unexpected ']'; expected end of input)
 
 result: false
-
 
 
Version history
 
     
  • Added in version 3.2.0.
    •  
   
 
   
  
 
 
 
 
 
 Copyright © 2013-2025 Niels Lohmann 
 
 
             
 
 
 
 
 
 
 
     
\ No newline at end of file
+

Version history

  • Added in version 3.2.0.
Copyright © 2013-2025 Niels Lohmann
\ No newline at end of file diff --git a/api/json_sax/start_array/index.html b/api/json_sax/start_array/index.html index c7a95cab3..be7366913 100644 --- a/api/json_sax/start_array/index.html +++ b/api/json_sax/start_array/index.html @@ -1,4 +1,4 @@ - start_array - JSON for Modern C++
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nlohmann::json_sax::start_array

virtual bool start_array(std::size_t elements) = 0;
+ start_array - JSON for Modern C++      
 
 
  
 
  
 
 
 
 
  
 
 
 
 
 
  
 
 
 
 
       
nlohmann::json_sax::start_array
 
virtual bool start_array(std::size_t elements) = 0;
 
 
The beginning of an array was read.
 
Parameters
 
 
elements (in)
 
number of object elements or -1 if unknown
 
 
Return value
 
Whether parsing should proceed.
 
Notes
 
Binary formats may report the number of elements.
 
Examples
 
 Example 
The example below shows how the SAX interface is used.
 
#include <iostream>
 #include <iomanip>
 #include <sstream>
@@ -167,4 +167,4 @@
             ex=[json.exception.parse_error.101] parse error at line 17, column 6: syntax error while parsing value - unexpected ']'; expected end of input)
 
 result: false
-
 
 
Version history
 
     
  • Added in version 3.2.0.
    •  
   
 
   
  
 
 
 
 
 
 Copyright © 2013-2025 Niels Lohmann 
 
 
             
 
 
 
 
 
 
 
     
\ No newline at end of file
+

Version history

  • Added in version 3.2.0.
Copyright © 2013-2025 Niels Lohmann
\ No newline at end of file diff --git a/api/json_sax/start_object/index.html b/api/json_sax/start_object/index.html index 2aa1f0d24..d90f60c13 100644 --- a/api/json_sax/start_object/index.html +++ b/api/json_sax/start_object/index.html @@ -1,4 +1,4 @@ - start_object - JSON for Modern C++
Skip to content

nlohmann::json_sax::start_object

virtual bool start_object(std::size_t elements) = 0;
+ start_object - JSON for Modern C++      
 
 
  
 
  
 
 
 
 
  
 
 
 
 
 
  
 
 
 
 
       
nlohmann::json_sax::start_object
 
virtual bool start_object(std::size_t elements) = 0;
 
 
The beginning of an object was read.
 
Parameters
 
 
elements (in)
 
number of object elements or -1 if unknown
 
 
Return value
 
Whether parsing should proceed.
 
Notes
 
Binary formats may report the number of elements.
 
Examples
 
 Example 
The example below shows how the SAX interface is used.
 
#include <iostream>
 #include <iomanip>
 #include <sstream>
@@ -167,4 +167,4 @@
             ex=[json.exception.parse_error.101] parse error at line 17, column 6: syntax error while parsing value - unexpected ']'; expected end of input)
 
 result: false
-
 
 
Version history
 
     
  • Added in version 3.2.0.
    •  
   
 
   
  
 
 
 
 
 
 Copyright © 2013-2025 Niels Lohmann 
 
 
             
 
 
 
 
 
 
 
     
\ No newline at end of file
+

Version history

  • Added in version 3.2.0.
Copyright © 2013-2025 Niels Lohmann
\ No newline at end of file diff --git a/api/json_sax/string/index.html b/api/json_sax/string/index.html index 4e4884100..ea9485de8 100644 --- a/api/json_sax/string/index.html +++ b/api/json_sax/string/index.html @@ -1,4 +1,4 @@ - string - JSON for Modern C++
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nlohmann::json_sax::string

virtual bool string(string_t& val) = 0;
+ string - JSON for Modern C++      
 
 
  
 
  
 
 
 
 
  
 
 
 
 
 
  
 
 
 
 
       
nlohmann::json_sax::string
 
virtual bool string(string_t& val) = 0;
 
 
A string value was read.
 
Parameters
 
 
val (in)
 
string value
 
 
Return value
 
Whether parsing should proceed.
 
Notes
 
It is safe to move the passed string value.
 
Examples
 
 Example 
The example below shows how the SAX interface is used.
 
#include <iostream>
 #include <iomanip>
 #include <sstream>
@@ -167,4 +167,4 @@
             ex=[json.exception.parse_error.101] parse error at line 17, column 6: syntax error while parsing value - unexpected ']'; expected end of input)
 
 result: false
-
 
 
Version history
 
     
  • Added in version 3.2.0.
    •  
   
 
   
  
 
 
 
 
 
 Copyright © 2013-2025 Niels Lohmann 
 
 
             
 
 
 
 
 
 
 
     
\ No newline at end of file
+

Version history

  • Added in version 3.2.0.
Copyright © 2013-2025 Niels Lohmann
\ No newline at end of file diff --git a/api/macros/index.html b/api/macros/index.html index 58723f81f..80ff8d089 100644 --- a/api/macros/index.html +++ b/api/macros/index.html @@ -1 +1 @@ - Overview - JSON for Modern C++
Skip to content

Macros

Some aspects of the library can be configured by defining preprocessor macros before including the json.hpp header. See also the macro overview page.

Runtime assertions

Exceptions

Language support

Library version

Library namespace

Type conversions

Comparison behavior

Serialization/deserialization macros

Enums

Classes and structs

Copyright © 2013-2025 Niels Lohmann
\ No newline at end of file + Overview - JSON for Modern C++
Skip to content

Macros

Some aspects of the library can be configured by defining preprocessor macros before including the json.hpp header. See also the macro overview page.

Runtime assertions

Exceptions

Language support

Library version

Library namespace

Type conversions

Comparison behavior

Serialization/deserialization macros

Enums

Classes and structs

Copyright © 2013-2025 Niels Lohmann
\ No newline at end of file diff --git a/api/macros/json_assert/index.html b/api/macros/json_assert/index.html index 95d0d9f19..1860d5b4c 100644 --- a/api/macros/json_assert/index.html +++ b/api/macros/json_assert/index.html @@ -1,4 +1,4 @@ - JSON_ASSERT - JSON for Modern C++
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JSON_ASSERT

#define JSON_ASSERT(x) /* value */
+ JSON_ASSERT - JSON for Modern C++      
 
 
  
 
  
 
 
 
 
  
 
 
 
 
 
  
 
 
 
 
       
JSON_ASSERT
 
#define JSON_ASSERT(x) /* value */
 
 
This macro controls which code is executed for runtime assertions of the library.
 
Parameters
 
 
x (in)
 
expression of a scalar type
 
 
Default definition
 
The default value is assert(x).
 
#define JSON_ASSERT(x) assert(x)
 
 
Therefore, assertions can be switched off by defining NDEBUG.
 
Notes
 
     
  • The library uses numerous assertions to guarantee invariants and to abort in case of otherwise undefined behavior (e.g., when calling operator[] with a missing object key on a const object). See page runtime assertions for more information.
    •  
  • Defining the macro to code that does not call std::abort may leave the library in an undefined state.
    •  
  • The macro is undefined outside the library.
    •  
 
Examples
 
 Example 1: default behavior 
The following code will trigger an assertion at runtime:
 
#include <nlohmann/json.hpp>
 
@@ -24,4 +24,4 @@
     auto v = j["missing"];
 }
 
 
Output:
 
assertion error in operator[]
-
 
 
See also
  
Version history
 
     
  • Added in version 3.9.0.
    •  
   
 
   
  
 
 
 
 
 
 Copyright © 2013-2025 Niels Lohmann 
 
 
             
 
 
 
 
 
 
 
     
\ No newline at end of file
+

See also

Version history

  • Added in version 3.9.0.
Copyright © 2013-2025 Niels Lohmann
\ No newline at end of file diff --git a/api/macros/json_diagnostic_positions/index.html b/api/macros/json_diagnostic_positions/index.html index 8cfe02228..5a8135c91 100644 --- a/api/macros/json_diagnostic_positions/index.html +++ b/api/macros/json_diagnostic_positions/index.html @@ -1,4 +1,4 @@ - JSON_DIAGNOSTIC_POSITIONS - JSON for Modern C++
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JSON_DIAGNOSTIC_POSITIONS

#define JSON_DIAGNOSTIC_POSITIONS /* value */
+ JSON_DIAGNOSTIC_POSITIONS - JSON for Modern C++      
 
 
  
 
  
 
 
 
 
  
 
 
 
 
 
  
 
 
 
 
       
JSON_DIAGNOSTIC_POSITIONS
 
#define JSON_DIAGNOSTIC_POSITIONS /* value */
 
 
This macro enables position diagnostics for generated JSON objects.
 
When enabled, two new member functions start_pos() and end_pos() are added to basic_json values. If the value was created by calling theparse function, then these functions allow querying the byte positions of the value in the input it was parsed from. In case the value was constructed by other means, std::string::npos is returned.
 
start_pos() returns the position of the first character of a given value in the original JSON string, while end_pos() returns the position of the character following the last character. For objects and arrays, the first and last characters correspond to the opening or closing braces/brackets, respectively. For primitive values, the first and last character represents the opening and closing quotes (strings) or the first and last character of the field's numerical or predefined value (true, false, null), respectively.
 
  
 JSON type return value start_pos() return value end_pos() 
   
 object position of the opening { position after the closing } 
 
 array position of the opening [ position after the closing ] 
 
 string position of the opening " position after the closing " 
 
 number position of the first character position after the last character 
 
 boolean position of t for true and f for false position after e 
 
 null position of n position after l 
  
 
Given the above, end_pos()-start_pos() for a JSON value provides the length of the parsed JSON string for that value, including the opening or closing braces, brackets, or quotes.
 
Note that enabling this macro increases the size of every JSON value by two std::size_t fields and adds slight runtime overhead to parsing, copying JSON value objects, and the generation of error messages for exceptions. It also causes these values to be reported in those error messages.
 
Default definition
 
The default value is 0 (position diagnostics are switched off).
 
#define JSON_DIAGNOSTIC_POSITIONS 0
 
 
When the macro is not defined, the library will define it to its default value.
 
Notes
 
 
CMake option
 
Diagnostic positions can also be controlled with the CMake option JSON_Diagnostic_Positions (OFF by default) which defines JSON_DIAGNOSTIC_POSITIONS accordingly.
 
 
 
Availability
 
Diagnostic positions are only available if the value was created by the parse function. The sax_parse function or all other means to create a JSON value do not set the diagnostic positions and start_pos() and end_pos() will only return std::string::npos for these values.
 
 
 
Invalidation
 
The returned positions are only valid as long as the JSON value is not changed. The positions are not updated when the JSON value is changed.
 
 
Examples
 
 Example: retrieving positions 
#include <iostream>
 
@@ -165,4 +165,4 @@ Parsed string:
 }
 
 
Output:
 
[json.exception.type_error.302] (/address/housenumber) (bytes 92-95) type must be number, but is string
 
 
The output shows the exception with diagnostic path info and start/end positions.
-
 
 
See also
  
Version history
 
     
  • Added in version 3.12.0.
    •  
   
 
   
  
 
 
 
 
 
 Copyright © 2013-2025 Niels Lohmann 
 
 
             
 
 
 
 
 
 
 
     
\ No newline at end of file
+

See also

Version history

  • Added in version 3.12.0.
Copyright © 2013-2025 Niels Lohmann
\ No newline at end of file diff --git a/api/macros/json_diagnostics/index.html b/api/macros/json_diagnostics/index.html index 1609bb034..dea474aee 100644 --- a/api/macros/json_diagnostics/index.html +++ b/api/macros/json_diagnostics/index.html @@ -1,4 +1,4 @@ - JSON_DIAGNOSTICS - JSON for Modern C++
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JSON_DIAGNOSTICS

#define JSON_DIAGNOSTICS /* value */
+ JSON_DIAGNOSTICS - JSON for Modern C++      
 
 
  
 
  
 
 
 
 
  
 
 
 
 
 
  
 
 
 
 
       
JSON_DIAGNOSTICS
 
#define JSON_DIAGNOSTICS /* value */
 
 
This macro enables extended diagnostics for exception messages. Possible values are 1 to enable or 0 to disable (default).
 
When enabled, exception messages contain a JSON Pointer to the JSON value that triggered the exception. Note that enabling this macro increases the size of every JSON value by one pointer and adds some runtime overhead.
 
Default definition
 
The default value is 0 (extended diagnostics are switched off).
 
#define JSON_DIAGNOSTICS 0
 
 
When the macro is not defined, the library will define it to its default value.
 
Notes
 
 
ABI compatibility
 
As of version 3.11.0, this macro is no longer required to be defined consistently throughout a codebase to avoid One Definition Rule (ODR) violations, as the value of this macro is encoded in the namespace, resulting in distinct symbol names. 
 
This allows different parts of a codebase to use different versions or configurations of this library without causing improper behavior.
 
Where possible, it is still recommended that all code define this the same way for maximum interoperability.
 
 
 
CMake option
 
Diagnostic messages can also be controlled with the CMake option JSON_Diagnostics (OFF by default) which defines JSON_DIAGNOSTICS accordingly.
 
 
Examples
 
 Example 1: default behavior 
#include <iostream>
 #include <nlohmann/json.hpp>
@@ -75,4 +75,4 @@
     }
 }
 
 
Output:
 
[json.exception.type_error.302] (bytes 92-95) type must be number, but is string
-
 The output shows the exception with start/end positions only.
 
 
See also
  
Version history
 
     
  • Added in version 3.10.0.
    •  
  • As of version 3.11.0, the definition is allowed to vary between translation units.
    •  
   
 
   
  
 
 
 
 
 
 Copyright © 2013-2025 Niels Lohmann 
 
 
             
 
 
 
 
 
 
 
     
\ No newline at end of file
+
The output shows the exception with start/end positions only.

See also

Version history

  • Added in version 3.10.0.
  • As of version 3.11.0, the definition is allowed to vary between translation units.
Copyright © 2013-2025 Niels Lohmann
\ No newline at end of file diff --git a/api/macros/json_disable_enum_serialization/index.html b/api/macros/json_disable_enum_serialization/index.html index dd8330cc5..a5496b5d3 100644 --- a/api/macros/json_disable_enum_serialization/index.html +++ b/api/macros/json_disable_enum_serialization/index.html @@ -1,4 +1,4 @@ - JSON_DISABLE_ENUM_SERIALIZATION - JSON for Modern C++
Skip to content

JSON_DISABLE_ENUM_SERIALIZATION

#define JSON_DISABLE_ENUM_SERIALIZATION /* value */
+ JSON_DISABLE_ENUM_SERIALIZATION - JSON for Modern C++      
 
 
  
 
  
 
 
 
 
  
 
 
 
 
 
  
 
 
 
 
       
JSON_DISABLE_ENUM_SERIALIZATION
 
#define JSON_DISABLE_ENUM_SERIALIZATION /* value */
 
 
When defined to 1, default serialization and deserialization functions for enums are excluded and have to be provided by the user, for example, using NLOHMANN_JSON_SERIALIZE_ENUM (see arbitrary type conversions for more details).
 
Parsing or serializing an enum will result in a compiler error.
 
This works for both unscoped and scoped enums.
 
Default definition
 
The default value is 0.
 
#define JSON_DISABLE_ENUM_SERIALIZATION 0
 
 
Notes
 
 
CMake option
 
Enum serialization can also be controlled with the CMake option JSON_DisableEnumSerialization (OFF by default) which defines JSON_DISABLE_ENUM_SERIALIZATION accordingly.
 
 
Examples
 
 Example 1: Disabled behavior 
The code below forces the library not to create default serialization/deserialization functions from_json and to_json, meaning the code below does not compile.
 
#define JSON_DISABLE_ENUM_SERIALIZATION 1
 #include <nlohmann/json.hpp>
@@ -89,4 +89,4 @@
     // uses user-defined from_json function
     Choice ch = j.template get<Choice>();
 }
-
 
 
See also
  
Version history
 
     
  • Added in version 3.11.0.
    •  
   
 
   
  
 
 
 
 
 
 Copyright © 2013-2025 Niels Lohmann 
 
 
             
 
 
 
 
 
 
 
     
\ No newline at end of file
+

See also

Version history

  • Added in version 3.11.0.
Copyright © 2013-2025 Niels Lohmann
\ No newline at end of file diff --git a/api/macros/json_has_cpp_11/index.html b/api/macros/json_has_cpp_11/index.html index ad243c3df..8de9ffd75 100644 --- a/api/macros/json_has_cpp_11/index.html +++ b/api/macros/json_has_cpp_11/index.html @@ -1,4 +1,4 @@ - JSON_HAS_CPP_11, JSON_HAS_CPP_14, JSON_HAS_CPP_17, JSON_HAS_CPP_20 - JSON for Modern C++
Skip to content

JSON_HAS_CPP_11, JSON_HAS_CPP_14, JSON_HAS_CPP_17, JSON_HAS_CPP_20

#define JSON_HAS_CPP_11
+ JSON_HAS_CPP_11, JSON_HAS_CPP_14, JSON_HAS_CPP_17, JSON_HAS_CPP_20 - JSON for Modern C++      
 
 
  
 
  
 
 
 
 
  
 
 
 
 
 
  
 
 
 
 
       
JSON_HAS_CPP_11, JSON_HAS_CPP_14, JSON_HAS_CPP_17, JSON_HAS_CPP_20
 
#define JSON_HAS_CPP_11
 #define JSON_HAS_CPP_14
 #define JSON_HAS_CPP_17
 #define JSON_HAS_CPP_20
@@ -6,4 +6,4 @@
 #include <nlohmann/json.hpp>
 
 ...
-
  
Version history
 
     
  • Added in version 3.10.5.
    •  
   
 
   
  
 
 
 
 
 
 Copyright © 2013-2025 Niels Lohmann 
 
 
             
 
 
 
 
 
 
 
     
\ No newline at end of file
+

Version history

  • Added in version 3.10.5.
Copyright © 2013-2025 Niels Lohmann
\ No newline at end of file diff --git a/api/macros/json_has_filesystem/index.html b/api/macros/json_has_filesystem/index.html index d68da6080..33d703d8f 100644 --- a/api/macros/json_has_filesystem/index.html +++ b/api/macros/json_has_filesystem/index.html @@ -1,7 +1,7 @@ - JSON_HAS_EXPERIMENTAL_FILESYSTEM, JSON_HAS_FILESYSTEM - JSON for Modern C++
Skip to content

JSON_HAS_FILESYSTEM / JSON_HAS_EXPERIMENTAL_FILESYSTEM

#define JSON_HAS_FILESYSTEM /* value */
+ JSON_HAS_EXPERIMENTAL_FILESYSTEM, JSON_HAS_FILESYSTEM - JSON for Modern C++      
 
 
  
 
  
 
 
 
 
  
 
 
 
 
 
  
 
 
 
 
       
JSON_HAS_FILESYSTEM / JSON_HAS_EXPERIMENTAL_FILESYSTEM
 
#define JSON_HAS_FILESYSTEM /* value */
 #define JSON_HAS_EXPERIMENTAL_FILESYSTEM /* value */
 
 
When compiling with C++17, the library provides conversions from and to std::filesystem::path. As compiler support for filesystem is limited, the library tries to detect whether <filesystem>/std::filesystem (JSON_HAS_FILESYSTEM) or <experimental/filesystem>/std::experimental::filesystem (JSON_HAS_EXPERIMENTAL_FILESYSTEM) should be used. To override the built-in check, define JSON_HAS_FILESYSTEM or JSON_HAS_EXPERIMENTAL_FILESYSTEM to 1.
 
Default definition
 
The default value is detected based on the preprocessor macros __cpp_lib_filesystem, __cpp_lib_experimental_filesystem, __has_include(<filesystem>), or __has_include(<experimental/filesystem>).
 
Notes
 
     
  • Note that older compilers or older versions of libstd++ also require the library stdc++fs to be linked to for filesystem support.
    •  
  • Both macros are undefined outside the library.
    •  
 
Examples
 
 Example 
The code below forces the library to use the header <experimental/filesystem>.
 
#define JSON_HAS_EXPERIMENTAL_FILESYSTEM 1
 #include <nlohmann/json.hpp>
 
 ...
-
 
 
Version history
 
     
  • Added in version 3.10.5.
    •  
   
 
   
  
 
 
 
 
 
 Copyright © 2013-2025 Niels Lohmann 
 
 
             
 
 
 
 
 
 
 
     
\ No newline at end of file
+

Version history

  • Added in version 3.10.5.
Copyright © 2013-2025 Niels Lohmann
\ No newline at end of file diff --git a/api/macros/json_has_ranges/index.html b/api/macros/json_has_ranges/index.html index 38fc963ac..d7a184602 100644 --- a/api/macros/json_has_ranges/index.html +++ b/api/macros/json_has_ranges/index.html @@ -1,6 +1,6 @@ - JSON_HAS_RANGES - JSON for Modern C++
Skip to content

JSON_HAS_RANGES

#define JSON_HAS_RANGES /* value */
+ JSON_HAS_RANGES - JSON for Modern C++      
 
 
  
 
  
 
 
 
 
  
 
 
 
 
 
  
 
 
 
 
       
JSON_HAS_RANGES
 
#define JSON_HAS_RANGES /* value */
 
 
This macro indicates whether the standard library has any support for ranges. Implies support for concepts. Possible values are 1 when supported or 0 when unsupported.
 
Default definition
 
The default value is detected based on the preprocessor macro __cpp_lib_ranges.
 
When the macro is not defined, the library will define it to its default value.
 
Examples
 
 Example 
The code below forces the library to enable support for ranges:
 
#define JSON_HAS_RANGES 1
 #include <nlohmann/json.hpp>
 
 ...
-
 
 
Version history
 
     
  • Added in version 3.11.0.
    •  
   
 
   
  
 
 
 
 
 
 Copyright © 2013-2025 Niels Lohmann 
 
 
             
 
 
 
 
 
 
 
     
\ No newline at end of file
+

Version history

  • Added in version 3.11.0.
Copyright © 2013-2025 Niels Lohmann
\ No newline at end of file diff --git a/api/macros/json_has_static_rtti/index.html b/api/macros/json_has_static_rtti/index.html index f384b2527..22d523f47 100644 --- a/api/macros/json_has_static_rtti/index.html +++ b/api/macros/json_has_static_rtti/index.html @@ -1,6 +1,6 @@ - JSON_HAS_STATIC_RTTI - JSON for Modern C++
Skip to content

JSON_HAS_STATIC_RTTI

#define JSON_HAS_STATIC_RTTI /* value */
+ JSON_HAS_STATIC_RTTI - JSON for Modern C++      
 
 
  
 
  
 
 
 
 
  
 
 
 
 
 
  
 
 
 
 
       
JSON_HAS_STATIC_RTTI
 
#define JSON_HAS_STATIC_RTTI /* value */
 
 
This macro indicates whether the standard library has any support for RTTI (run time type information). Possible values are 1 when supported or 0 when unsupported.
 
Default definition
 
The default value is detected based on the preprocessor macro _HAS_STATIC_RTTI.
 
When the macro is not defined, the library will define it to its default value.
 
Examples
 
 Example 
The code below forces the library to enable support for libraries with RTTI dependence:
 
#define JSON_HAS_STATIC_RTTI 1
 #include <nlohmann/json.hpp>
 
 ...
-
 
 
Version history
 
     
  • Added in version 3.11.3.
    •  
   
 
   
  
 
 
 
 
 
 Copyright © 2013-2025 Niels Lohmann 
 
 
             
 
 
 
 
 
 
 
     
\ No newline at end of file
+

Version history

  • Added in version 3.11.3.
Copyright © 2013-2025 Niels Lohmann
\ No newline at end of file diff --git a/api/macros/json_has_three_way_comparison/index.html b/api/macros/json_has_three_way_comparison/index.html index 2ce928c60..f7bd428d9 100644 --- a/api/macros/json_has_three_way_comparison/index.html +++ b/api/macros/json_has_three_way_comparison/index.html @@ -1,6 +1,6 @@ - JSON_HAS_THREE_WAY_COMPARISON - JSON for Modern C++
Skip to content

JSON_HAS_THREE_WAY_COMPARISON

#define JSON_HAS_THREE_WAY_COMPARISON /* value */
+ JSON_HAS_THREE_WAY_COMPARISON - JSON for Modern C++      
 
 
  
 
  
 
 
 
 
  
 
 
 
 
 
  
 
 
 
 
       
JSON_HAS_THREE_WAY_COMPARISON
 
#define JSON_HAS_THREE_WAY_COMPARISON /* value */
 
 
This macro indicates whether the compiler and standard library support 3-way comparison. Possible values are 1 when supported or 0 when unsupported.
 
Default definition
 
The default value is detected based on the preprocessor macros __cpp_impl_three_way_comparison and __cpp_lib_three_way_comparison.
 
When the macro is not defined, the library will define it to its default value.
 
Examples
 
 Example 
The code below forces the library to use 3-way comparison:
 
#define JSON_HAS_THREE_WAY_COMPARISON 1
 #include <nlohmann/json.hpp>
 
 ...
-
 
 
Version history
 
     
  • Added in version 3.11.0.
    •  
   
 
   
  
 
 
 
 
 
 Copyright © 2013-2025 Niels Lohmann 
 
 
             
 
 
 
 
 
 
 
     
\ No newline at end of file
+

Version history

  • Added in version 3.11.0.
Copyright © 2013-2025 Niels Lohmann
\ No newline at end of file diff --git a/api/macros/json_no_io/index.html b/api/macros/json_no_io/index.html index 0701938e6..f4b4f1f98 100644 --- a/api/macros/json_no_io/index.html +++ b/api/macros/json_no_io/index.html @@ -1,7 +1,7 @@ - JSON_NO_IO - JSON for Modern C++
Skip to content

JSON_NO_IO

#define JSON_NO_IO
+ JSON_NO_IO - JSON for Modern C++      
 
 
  
 
  
 
 
 
 
  
 
 
 
 
 
  
 
 
 
 
       
JSON_NO_IO
 
#define JSON_NO_IO
 
 
When defined, headers <cstdio>, <ios>, <iosfwd>, <istream>, and <ostream> are not included and parse functions relying on these headers are excluded. This is relevant for environments where these I/O functions are disallowed for security reasons (e.g., Intel Software Guard Extensions (SGX)).
 
Default definition
 
By default, JSON_NO_IO is not defined.
 
#undef JSON_NO_IO
 
 
Examples
 
 Example 
The code below forces the library not to use the headers <cstdio>, <ios>, <iosfwd>, <istream>, and <ostream>.
 
#define JSON_NO_IO 1
 #include <nlohmann/json.hpp>
 
 ...
-
 
 
Version history
 
     
  • Added in version 3.10.0.
    •  
   
 
   
  
 
 
 
 
 
 Copyright © 2013-2025 Niels Lohmann 
 
 
             
 
 
 
 
 
 
 
     
\ No newline at end of file
+

Version history

  • Added in version 3.10.0.
Copyright © 2013-2025 Niels Lohmann
\ No newline at end of file diff --git a/api/macros/json_noexception/index.html b/api/macros/json_noexception/index.html index 69d57876e..116311985 100644 --- a/api/macros/json_noexception/index.html +++ b/api/macros/json_noexception/index.html @@ -1,7 +1,7 @@ - JSON_NOEXCEPTION - JSON for Modern C++
Skip to content

JSON_NOEXCEPTION

#define JSON_NOEXCEPTION
+ JSON_NOEXCEPTION - JSON for Modern C++      
 
 
  
 
  
 
 
 
 
  
 
 
 
 
 
  
 
 
 
 
       
JSON_NOEXCEPTION
 
#define JSON_NOEXCEPTION
 
 
Exceptions can be switched off by defining the symbol JSON_NOEXCEPTION. When defining JSON_NOEXCEPTION, try is replaced by if (true), catch is replaced by if (false), and throw is replaced by std::abort().
 
The same effect is achieved by setting the compiler flag -fno-exceptions.
 
Default definition
 
By default, the macro is not defined.
 
#undef JSON_NOEXCEPTION
 
 
Notes
 
The explanatory what() string of exceptions is not available for MSVC if exceptions are disabled, see #2824.
 
Examples
 
 Example 
The code below switches off exceptions in the library.
 
#define JSON_NOEXCEPTION 1
 #include <nlohmann/json.hpp>
 
 ...
-
 
 
See also
  
Version history
 
Added in version 2.1.0.
   
 
   
  
 
 
 
 
 
 Copyright © 2013-2025 Niels Lohmann 
 
 
             
 
 
 
 
 
 
 
     
\ No newline at end of file
+

See also

Version history

Added in version 2.1.0.

Copyright © 2013-2025 Niels Lohmann
\ No newline at end of file diff --git a/api/macros/json_skip_library_version_check/index.html b/api/macros/json_skip_library_version_check/index.html index 001889cbb..26bc74ab2 100644 --- a/api/macros/json_skip_library_version_check/index.html +++ b/api/macros/json_skip_library_version_check/index.html @@ -1,4 +1,4 @@ - JSON_SKIP_LIBRARY_VERSION_CHECK - JSON for Modern C++
Skip to content

JSON_SKIP_LIBRARY_VERSION_CHECK

#define JSON_SKIP_LIBRARY_VERSION_CHECK
+ JSON_SKIP_LIBRARY_VERSION_CHECK - JSON for Modern C++      
 
 
  
 
  
 
 
 
 
  
 
 
 
 
 
  
 
 
 
 
       
JSON_SKIP_LIBRARY_VERSION_CHECK
 
#define JSON_SKIP_LIBRARY_VERSION_CHECK
 
 
When defined, the library will not create a compiler warning when a different version of the library was already included.
 
Default definition
 
By default, the macro is not defined.
 
#undef JSON_SKIP_LIBRARY_VERSION_CHECK
 
 
Notes
 
 
ABI compatibility
 
Mixing different library versions in the same code can be a problem as the different versions may not be ABI compatible.
 
 
Examples
 
 
Example
 
The following warning will be shown in case a different version of the library was already included:
 
Already included a different version of the library!
-
 
 
Version history
 
Added in version 3.11.0.
   
 
   
  
 
 
 
 
 
 Copyright © 2013-2025 Niels Lohmann 
 
 
             
 
 
 
 
 
 
 
     
\ No newline at end of file
+

Version history

Added in version 3.11.0.

\ No newline at end of file diff --git a/api/macros/json_skip_unsupported_compiler_check/index.html b/api/macros/json_skip_unsupported_compiler_check/index.html index a92cd89f5..2ab81b406 100644 --- a/api/macros/json_skip_unsupported_compiler_check/index.html +++ b/api/macros/json_skip_unsupported_compiler_check/index.html @@ -1,7 +1,7 @@ - JSON_SKIP_UNSUPPORTED_COMPILER_CHECK - JSON for Modern C++
Skip to content

JSON_SKIP_UNSUPPORTED_COMPILER_CHECK

#define JSON_SKIP_UNSUPPORTED_COMPILER_CHECK
+ JSON_SKIP_UNSUPPORTED_COMPILER_CHECK - JSON for Modern C++      
 
 
  
 
  
 
 
 
 
  
 
 
 
 
 
  
 
 
 
 
       
JSON_SKIP_UNSUPPORTED_COMPILER_CHECK
 
#define JSON_SKIP_UNSUPPORTED_COMPILER_CHECK
 
 
When defined, the library will not create a compile error when a known unsupported compiler is detected. This allows using the library with compilers that do not fully support C++11 and may only work if unsupported features are not used.
 
Default definition
 
By default, the macro is not defined.
 
#undef JSON_SKIP_UNSUPPORTED_COMPILER_CHECK
 
 
Examples
 
 Example 
The code below switches off the check whether the compiler is supported.
 
#define JSON_SKIP_UNSUPPORTED_COMPILER_CHECK 1
 #include <nlohmann/json.hpp>
 
 ...
-
 
 
Version history
 
Added in version 3.2.0.
   
 
   
  
 
 
 
 
 
 Copyright © 2013-2025 Niels Lohmann 
 
 
             
 
 
 
 
 
 
 
     
\ No newline at end of file
+

Version history

Added in version 3.2.0.

Copyright © 2013-2025 Niels Lohmann
\ No newline at end of file diff --git a/api/macros/json_throw_user/index.html b/api/macros/json_throw_user/index.html index 7abd07fcd..6ed499fc8 100644 --- a/api/macros/json_throw_user/index.html +++ b/api/macros/json_throw_user/index.html @@ -1,4 +1,4 @@ - JSON_CATCH_USER, JSON_THROW_USER, JSON_TRY_USER - JSON for Modern C++
Skip to content

JSON_CATCH_USER, JSON_THROW_USER, JSON_TRY_USER

// (1)
+ JSON_CATCH_USER, JSON_THROW_USER, JSON_TRY_USER - JSON for Modern C++      
 
 
  
 
  
 
 
 
 
  
 
 
 
 
 
  
 
 
 
 
       
JSON_CATCH_USER, JSON_THROW_USER, JSON_TRY_USER
 
// (1)
 #define JSON_CATCH_USER(exception) /* value */
 // (2)
 #define JSON_THROW_USER(exception) /* value */
@@ -21,4 +21,4 @@
      std::abort();}
 
 #include <nlohmann/json.hpp>
-
  
See also
  
Version history
 
     
  • Added in version 3.1.0.
    •  
   
 
   
  
 
 
 
 
 
 Copyright © 2013-2025 Niels Lohmann 
 
 
             
 
 
 
 
 
 
 
     
\ No newline at end of file
+

See also

Version history

  • Added in version 3.1.0.
Copyright © 2013-2025 Niels Lohmann
\ No newline at end of file diff --git a/api/macros/json_use_global_udls/index.html b/api/macros/json_use_global_udls/index.html index 573d3dcb1..8d39fb0b1 100644 --- a/api/macros/json_use_global_udls/index.html +++ b/api/macros/json_use_global_udls/index.html @@ -1,4 +1,4 @@ - JSON_USE_GLOBAL_UDLS - JSON for Modern C++
Skip to content

JSON_USE_GLOBAL_UDLS

#define JSON_USE_GLOBAL_UDLS /* value */
+ JSON_USE_GLOBAL_UDLS - JSON for Modern C++      
 
 
  
 
  
 
 
 
 
  
 
 
 
 
 
  
 
 
 
 
       
JSON_USE_GLOBAL_UDLS
 
#define JSON_USE_GLOBAL_UDLS /* value */
 
 
When defined to 1, the user-defined string literals (UDLs) are placed into the global namespace instead of nlohmann::literals::json_literals.
 
Default definition
 
The default value is 1.
 
#define JSON_USE_GLOBAL_UDLS 1
 
 
When the macro is not defined, the library will define it to its default value.
 
Notes
 
 
Future behavior change
 
The user-defined string literals will be removed from the global namespace in the next major release of the library.
 
To prepare existing code, define JSON_USE_GLOBAL_UDLS to 0 and bring the string literals into scope where needed. Refer to any of the string literals for details.
 
 
 
CMake option
 
The placement of user-defined string literals can also be controlled with the CMake option JSON_GlobalUDLs (ON by default) which defines JSON_USE_GLOBAL_UDLS accordingly.
 
 
Examples
 
 Example 1: Default behavior 
The code below shows the default behavior using the _json UDL.
 
#include <nlohmann/json.hpp>
 
@@ -29,4 +29,4 @@
     std::cout << j << std::endl;
 }
 
 
Output:
 
42
-
 
 
See also
  
Version history
 
     
  • Added in version 3.11.0.
    •  
   
 
   
  
 
 
 
 
 
 Copyright © 2013-2025 Niels Lohmann 
 
 
             
 
 
 
 
 
 
 
     
\ No newline at end of file
+

See also

Version history

  • Added in version 3.11.0.
Copyright © 2013-2025 Niels Lohmann
\ No newline at end of file diff --git a/api/macros/json_use_implicit_conversions/index.html b/api/macros/json_use_implicit_conversions/index.html index 03f1ae9f2..df49e937d 100644 --- a/api/macros/json_use_implicit_conversions/index.html +++ b/api/macros/json_use_implicit_conversions/index.html @@ -1,7 +1,7 @@ - JSON_USE_IMPLICIT_CONVERSIONS - JSON for Modern C++
Skip to content

JSON_USE_IMPLICIT_CONVERSIONS

#define JSON_USE_IMPLICIT_CONVERSIONS /* value */
+ JSON_USE_IMPLICIT_CONVERSIONS - JSON for Modern C++      
 
 
  
 
  
 
 
 
 
  
 
 
 
 
 
  
 
 
 
 
       
JSON_USE_IMPLICIT_CONVERSIONS
 
#define JSON_USE_IMPLICIT_CONVERSIONS /* value */
 
 
When defined to 0, implicit conversions are switched off. By default, implicit conversions are switched on. The value directly affects operator ValueType.
 
Default definition
 
By default, implicit conversions are enabled.
 
#define JSON_USE_IMPLICIT_CONVERSIONS 1
 
 
Notes
 
 
Future behavior change
 
Implicit conversions will be switched off by default in the next major release of the library.
 
You can prepare existing code by already defining JSON_USE_IMPLICIT_CONVERSIONS to 0 and replace any implicit conversions with calls to get.
 
 
 
CMake option
 
Implicit conversions can also be controlled with the CMake option JSON_ImplicitConversions (ON by default) which defines JSON_USE_IMPLICIT_CONVERSIONS accordingly.
 
 
Examples
 
 Example 
This is an example for an implicit conversion:
 
json j = "Hello, world!";
 std::string s = j;
 
 
When JSON_USE_IMPLICIT_CONVERSIONS is defined to 0, the code above does no longer compile. Instead, it must be written like this:
 
json j = "Hello, world!";
 auto s = j.template get<std::string>();
-
 
 
See also
  
Version history
 
     
  • Added in version 3.9.0.
    •  
   
 
   
  
 
 
 
 
 
 Copyright © 2013-2025 Niels Lohmann 
 
 
             
 
 
 
 
 
 
 
     
\ No newline at end of file
+

See also

Version history

  • Added in version 3.9.0.
Copyright © 2013-2025 Niels Lohmann
\ No newline at end of file diff --git a/api/macros/json_use_legacy_discarded_value_comparison/index.html b/api/macros/json_use_legacy_discarded_value_comparison/index.html index 0e8080c45..54a6825a6 100644 --- a/api/macros/json_use_legacy_discarded_value_comparison/index.html +++ b/api/macros/json_use_legacy_discarded_value_comparison/index.html @@ -1,7 +1,7 @@ - JSON_USE_LEGACY_DISCARDED_VALUE_COMPARISON - JSON for Modern C++
Skip to content

JSON_USE_LEGACY_DISCARDED_VALUE_COMPARISON

#define JSON_USE_LEGACY_DISCARDED_VALUE_COMPARISON /* value */
+ JSON_USE_LEGACY_DISCARDED_VALUE_COMPARISON - JSON for Modern C++      
 
 
  
 
  
 
 
 
 
  
 
 
 
 
 
  
 
 
 
 
       
JSON_USE_LEGACY_DISCARDED_VALUE_COMPARISON
 
#define JSON_USE_LEGACY_DISCARDED_VALUE_COMPARISON /* value */
 
 
This macro enables the (incorrect) legacy comparison behavior of discarded JSON values. Possible values are 1 to enable or 0 to disable (default).
 
When enabled, comparisons involving at least one discarded JSON value yield results as follows:
 
  
 Operator Result 
   
 == false 
 
 != true 
 
 < false 
 
 <= true 
 
 >= true 
 
 > false 
  
 
Otherwise, comparisons involving at least one discarded JSON value always yield false.
 
Default definition
 
The default value is 0.
 
#define JSON_USE_LEGACY_DISCARDED_VALUE_COMPARISON 0
 
 
When the macro is not defined, the library will define it to its default value.
 
Notes
 
 
Inconsistent behavior in C++20 and beyond
 
When targeting C++20 or above, enabling the legacy comparison behavior is strongly discouraged.
 
     
  • The 3-way comparison operator (<=>) will always give the correct result (std::partial_ordering::unordered) regardless of the value of JSON_USE_LEGACY_DISCARDED_VALUE_COMPARISON.
    •  
  • Overloads for the equality and relational operators emulate the legacy behavior.
    •  
 
Code outside your control may use either 3-way comparison or the equality and relational operators, resulting in inconsistent and unpredictable behavior.
 
See operator<=> for more information on 3-way comparison.
 
 
 
Deprecation
 
The legacy comparison behavior is deprecated and may be removed in a future major version release.
 
New code should not depend on it and existing code should try to remove or rewrite expressions relying on it.
 
 
 
CMake option
 
Legacy comparison can also be controlled with the CMake option JSON_LegacyDiscardedValueComparison (OFF by default) which defines JSON_USE_LEGACY_DISCARDED_VALUE_COMPARISON accordingly.
 
 
Examples
 
 Example 
The code below switches on the legacy discarded value comparison behavior in the library.
 
#define JSON_USE_LEGACY_DISCARDED_VALUE_COMPARISON 1
 #include <nlohmann/json.hpp>
 
 ...
-
 
 
See also
  
Version history
 
     
  • Added in version 3.11.0.
    •  
   
 
   
  
 
 
 
 
 
 Copyright © 2013-2025 Niels Lohmann 
 
 
             
 
 
 
 
 
 
 
     
\ No newline at end of file
+

See also

Version history

  • Added in version 3.11.0.
Copyright © 2013-2025 Niels Lohmann
\ No newline at end of file diff --git a/api/macros/nlohmann_define_derived_type/index.html b/api/macros/nlohmann_define_derived_type/index.html index def2d5378..f439464d3 100644 --- a/api/macros/nlohmann_define_derived_type/index.html +++ b/api/macros/nlohmann_define_derived_type/index.html @@ -1,4 +1,4 @@ - NLOHMANN_DEFINE_DERIVED_TYPE_INTRUSIVE, NLOHMANN_DEFINE_DERIVED_TYPE_INTRUSIVE_WITH_DEFAULT, NLOHMANN_DEFINE_DERIVED_TYPE_INTRUSIVE_ONLY_SERIALIZE, NLOHMANN_DEFINE_DERIVED_TYPE_NON_INTRUSIVE, NLOHMANN_DEFINE_DERIVED_TYPE_NON_INTRUSIVE_WITH_DEFAULT, NLOHMANN_DEFINE_DERIVED_TYPE_NON_INTRUSIVE_ONLY_SERIALIZE - JSON for Modern C++
Skip to content

NLOHMANN_DEFINE_DERIVED_TYPE_INTRUSIVE, NLOHMANN_DEFINE_DERIVED_TYPE_INTRUSIVE_WITH_DEFAULT, NLOHMANN_DEFINE_DERIVED_TYPE_INTRUSIVE_ONLY_SERIALIZE, NLOHMANN_DEFINE_DERIVED_TYPE_NON_INTRUSIVE, NLOHMANN_DEFINE_DERIVED_TYPE_NON_INTRUSIVE_WITH_DEFAULT, NLOHMANN_DEFINE_DERIVED_TYPE_NON_INTRUSIVE_ONLY_SERIALIZE

// (1)
+ NLOHMANN_DEFINE_DERIVED_TYPE_INTRUSIVE, NLOHMANN_DEFINE_DERIVED_TYPE_INTRUSIVE_WITH_DEFAULT, NLOHMANN_DEFINE_DERIVED_TYPE_INTRUSIVE_ONLY_SERIALIZE, NLOHMANN_DEFINE_DERIVED_TYPE_NON_INTRUSIVE, NLOHMANN_DEFINE_DERIVED_TYPE_NON_INTRUSIVE_WITH_DEFAULT, NLOHMANN_DEFINE_DERIVED_TYPE_NON_INTRUSIVE_ONLY_SERIALIZE - JSON for Modern C++      
 
 
  
 
  
 
 
 
 
  
 
 
 
 
 
  
 
 
 
 
       
NLOHMANN_DEFINE_DERIVED_TYPE_INTRUSIVE, NLOHMANN_DEFINE_DERIVED_TYPE_INTRUSIVE_WITH_DEFAULT, NLOHMANN_DEFINE_DERIVED_TYPE_INTRUSIVE_ONLY_SERIALIZE, NLOHMANN_DEFINE_DERIVED_TYPE_NON_INTRUSIVE, NLOHMANN_DEFINE_DERIVED_TYPE_NON_INTRUSIVE_WITH_DEFAULT, NLOHMANN_DEFINE_DERIVED_TYPE_NON_INTRUSIVE_ONLY_SERIALIZE
 
// (1)
 #define NLOHMANN_DEFINE_DERIVED_TYPE_INTRUSIVE(type, base_type, member...)
 // (2)
 #define NLOHMANN_DEFINE_DERIVED_TYPE_INTRUSIVE_WITH_DEFAULT(type, base_type, member...)
@@ -86,4 +86,4 @@
     "Ba": 23,
     "Bb": 42
 }
-
 
Notes:
 
     
  • A and B are default-constructible. This is a requirement for using the macro.
    •  
  • A has private members and is not a derived class. Hence, macro NLOHMANN_DEFINE_TYPE_INTRUSIVE is used.
    •  
  • As B is a derived class, NLOHMANN_DEFINE_TYPE_INTRUSIVE is not applicable, but NLOHMANN_DEFINE_DERIVED_TYPE_INTRUSIVE must be used.
    •  
  • The macro NLOHMANN_DEFINE_DERIVED_TYPE_INTRUSIVE is used inside the class use as NLOHMANN_DEFINE_TYPE_INTRUSIVE.
    •  
  
See also
  
Version history
 
     
  1. Added in version 3.12.0.
    2.  
  2. Added in version 3.12.0.
    3.  
  3. Added in version 3.12.0.
    4.  
  4. Added in version 3.12.0.
    5.  
  5. Added in version 3.12.0.
    6.  
  6. Added in version 3.12.0.
    7.  
   
 
   
  
 
 
 
 
 
 Copyright © 2013-2025 Niels Lohmann 
 
 
             
 
 
 
 
 
 
 
     
\ No newline at end of file
+

Notes:

  • A and B are default-constructible. This is a requirement for using the macro.
  • A has private members and is not a derived class. Hence, macro NLOHMANN_DEFINE_TYPE_INTRUSIVE is used.
  • As B is a derived class, NLOHMANN_DEFINE_TYPE_INTRUSIVE is not applicable, but NLOHMANN_DEFINE_DERIVED_TYPE_INTRUSIVE must be used.
  • The macro NLOHMANN_DEFINE_DERIVED_TYPE_INTRUSIVE is used inside the class use as NLOHMANN_DEFINE_TYPE_INTRUSIVE.

See also

Version history

  1. Added in version 3.12.0.
  2. Added in version 3.12.0.
  3. Added in version 3.12.0.
  4. Added in version 3.12.0.
  5. Added in version 3.12.0.
  6. Added in version 3.12.0.
Copyright © 2013-2025 Niels Lohmann
\ No newline at end of file diff --git a/api/macros/nlohmann_define_type_intrusive/index.html b/api/macros/nlohmann_define_type_intrusive/index.html index a1f9f09b3..8e13d99e0 100644 --- a/api/macros/nlohmann_define_type_intrusive/index.html +++ b/api/macros/nlohmann_define_type_intrusive/index.html @@ -1,4 +1,4 @@ - NLOHMANN_DEFINE_TYPE_INTRUSIVE, NLOHMANN_DEFINE_TYPE_INTRUSIVE_WITH_DEFAULT, NLOHMANN_DEFINE_TYPE_INTRUSIVE_ONLY_SERIALIZE - JSON for Modern C++
Skip to content

NLOHMANN_DEFINE_TYPE_INTRUSIVE, NLOHMANN_DEFINE_TYPE_INTRUSIVE_WITH_DEFAULT, NLOHMANN_DEFINE_TYPE_INTRUSIVE_ONLY_SERIALIZE

#define NLOHMANN_DEFINE_TYPE_INTRUSIVE(type, member...)              // (1)
+ NLOHMANN_DEFINE_TYPE_INTRUSIVE, NLOHMANN_DEFINE_TYPE_INTRUSIVE_WITH_DEFAULT, NLOHMANN_DEFINE_TYPE_INTRUSIVE_ONLY_SERIALIZE - JSON for Modern C++      
 
 
  
 
  
 
 
 
 
  
 
 
 
 
 
  
 
 
 
 
       
NLOHMANN_DEFINE_TYPE_INTRUSIVE, NLOHMANN_DEFINE_TYPE_INTRUSIVE_WITH_DEFAULT, NLOHMANN_DEFINE_TYPE_INTRUSIVE_ONLY_SERIALIZE
 
#define NLOHMANN_DEFINE_TYPE_INTRUSIVE(type, member...)              // (1)
 #define NLOHMANN_DEFINE_TYPE_INTRUSIVE_WITH_DEFAULT(type, member...) // (2)
 #define NLOHMANN_DEFINE_TYPE_INTRUSIVE_ONLY_SERIALIZE(type, member...) // (3)
 
 
These macros can be used to simplify the serialization/deserialization of types if you want to use a JSON object as serialization and want to use the member variable names as object keys in that object. The macro is to be defined inside the class/struct to create code for. Unlike NLOHMANN_DEFINE_TYPE_NON_INTRUSIVE, it can access private members. The first parameter is the name of the class/struct, and all remaining parameters name the members.
 
     
  1. Will use at during deserialization and will throw out_of_range.403 if a key is missing in the JSON object.
    2.  
  2. Will use value during deserialization and fall back to the default value for the respective type of the member variable if a key in the JSON object is missing. The generated from_json() function default constructs an object and uses its values as the defaults when calling the value function.
    3.  
  3. Only defines the serialization. Useful in cases when the type does not have a default constructor and only serialization is required.
    4.  
 
Summary:
 
  
 Need access to private members Need only de-serialization Allow missing values when de-serializing macro 
   
 
 
 
 NLOHMANN_DEFINE_TYPE_INTRUSIVE 
 
 
 
 
 NLOHMANN_DEFINE_TYPE_INTRUSIVE_WITH_DEFAULT 
 
 
 
 
 NLOHMANN_DEFINE_TYPE_INTRUSIVE_ONLY_SERIALIZE 
  
 
Parameters
 
 
type (in)
 
name of the type (class, struct) to serialize/deserialize
 
member (in)
 
name of the member variable to serialize/deserialize; up to 64 members can be given as a comma-separated list
 
 
Default definition
 
The macros add two friend functions to the class which take care of the serialization and deserialization:
 
template<typename BasicJsonType>
@@ -291,4 +291,4 @@
     json j = p;
     std::cout << "serialization: " << j << std::endl;
 }
-
  
See also
  
Version history
 
     
  1. Added in version 3.9.0.
    2.  
  2. Added in version 3.11.0.
    3.  
  3. Added in version 3.11.3.
    4.  
   
 
   
  
 
 
 
 
 
 Copyright © 2013-2025 Niels Lohmann 
 
 
             
 
 
 
 
 
 
 
     
\ No newline at end of file
+

See also

Version history

  1. Added in version 3.9.0.
  2. Added in version 3.11.0.
  3. Added in version 3.11.3.
Copyright © 2013-2025 Niels Lohmann
\ No newline at end of file diff --git a/api/macros/nlohmann_define_type_non_intrusive/index.html b/api/macros/nlohmann_define_type_non_intrusive/index.html index 2f962786d..ce48d1ef9 100644 --- a/api/macros/nlohmann_define_type_non_intrusive/index.html +++ b/api/macros/nlohmann_define_type_non_intrusive/index.html @@ -1,4 +1,4 @@ - NLOHMANN_DEFINE_TYPE_NON_INTRUSIVE, NLOHMANN_DEFINE_TYPE_NON_INTRUSIVE_WITH_DEFAULT, NLOHMANN_DEFINE_TYPE_NON_INTRUSIVE_ONLY_SERIALIZE - JSON for Modern C++
Skip to content

NLOHMANN_DEFINE_TYPE_NON_INTRUSIVE, NLOHMANN_DEFINE_TYPE_NON_INTRUSIVE_WITH_DEFAULT, NLOHMANN_DEFINE_TYPE_NON_INTRUSIVE_ONLY_SERIALIZE

#define NLOHMANN_DEFINE_TYPE_NON_INTRUSIVE(type, member...)              // (1)
+ NLOHMANN_DEFINE_TYPE_NON_INTRUSIVE, NLOHMANN_DEFINE_TYPE_NON_INTRUSIVE_WITH_DEFAULT, NLOHMANN_DEFINE_TYPE_NON_INTRUSIVE_ONLY_SERIALIZE - JSON for Modern C++      
 
 
  
 
  
 
 
 
 
  
 
 
 
 
 
  
 
 
 
 
       
NLOHMANN_DEFINE_TYPE_NON_INTRUSIVE, NLOHMANN_DEFINE_TYPE_NON_INTRUSIVE_WITH_DEFAULT, NLOHMANN_DEFINE_TYPE_NON_INTRUSIVE_ONLY_SERIALIZE
 
#define NLOHMANN_DEFINE_TYPE_NON_INTRUSIVE(type, member...)              // (1)
 #define NLOHMANN_DEFINE_TYPE_NON_INTRUSIVE_WITH_DEFAULT(type, member...) // (2)
 #define NLOHMANN_DEFINE_TYPE_NON_INTRUSIVE_ONLY_SERIALIZE(type, member...) // (3)
 
 
These macros can be used to simplify the serialization/deserialization of types if you want to use a JSON object as serialization and want to use the member variable names as object keys in that object. The macro is to be defined outside the class/struct to create code for, but inside its namespace. Unlike NLOHMANN_DEFINE_TYPE_INTRUSIVE, it cannot access private members. The first parameter is the name of the class/struct, and all remaining parameters name the members.
 
     
  1. Will use at during deserialization and will throw out_of_range.403 if a key is missing in the JSON object.
    2.  
  2. Will use value during deserialization and fall back to the default value for the respective type of the member variable if a key in the JSON object is missing. The generated from_json() function default constructs an object and uses its values as the defaults when calling the value function.
    3.  
  3. Only defines the serialization. Useful in cases when the type does not have a default constructor and only serialization is required.
    4.  
 
Summary:
 
  
 Need access to private members Need only de-serialization Allow missing values when de-serializing macro 
   
 
 
 
 NLOHMANN_DEFINE_TYPE_NON_INTRUSIVE 
 
 
 
 
 NLOHMANN_DEFINE_TYPE_NON_INTRUSIVE_WITH_DEFAULT 
 
 
 
 
 NLOHMANN_DEFINE_TYPE_NON_INTRUSIVE_ONLY_SERIALIZE 
  
 
Parameters
 
 
type (in)
 
name of the type (class, struct) to serialize/deserialize
 
member (in)
 
name of the (public) member variable to serialize/deserialize; up to 64 members can be given as a comma-separated list
 
 
Default definition
 
The macros add two functions to the namespace which take care of the serialization and deserialization:
 
template<typename BasicJsonType>
@@ -259,4 +259,4 @@
     json j = p;
     std::cout << "serialization: " << j << std::endl;
 }
-
  
See also
  
Version history
 
     
  1. Added in version 3.9.0.
    2.  
  2. Added in version 3.11.0.
    3.  
  3. Added in version 3.11.3.
    4.  
   
 
   
  
 
 
 
 
 
 Copyright © 2013-2025 Niels Lohmann 
 
 
             
 
 
 
 
 
 
 
     
\ No newline at end of file
+

See also

Version history

  1. Added in version 3.9.0.
  2. Added in version 3.11.0.
  3. Added in version 3.11.3.
Copyright © 2013-2025 Niels Lohmann
\ No newline at end of file diff --git a/api/macros/nlohmann_json_namespace/index.html b/api/macros/nlohmann_json_namespace/index.html index 99297a67d..6de30f78c 100644 --- a/api/macros/nlohmann_json_namespace/index.html +++ b/api/macros/nlohmann_json_namespace/index.html @@ -1,4 +1,4 @@ - NLOHMANN_JSON_NAMESPACE - JSON for Modern C++
Skip to content

NLOHMANN_JSON_NAMESPACE

#define NLOHMANN_JSON_NAMESPACE /* value */
+ NLOHMANN_JSON_NAMESPACE - JSON for Modern C++      
 
 
  
 
  
 
 
 
 
  
 
 
 
 
 
  
 
 
 
 
       
NLOHMANN_JSON_NAMESPACE
 
#define NLOHMANN_JSON_NAMESPACE /* value */
 
 
This macro evaluates to the full name of the nlohmann namespace.
 
Default definition
 
The default value consists of the root namespace (nlohmann) and an inline ABI namespace. See nlohmann Namespace for details.
 
When the macro is not defined, the library will define it to its default value. Overriding this value has no effect on the library.
 
Examples
 
 Example 
The example shows how to use NLOHMANN_JSON_NAMESPACE instead of just nlohmann, as well as how to output the value of NLOHMANN_JSON_NAMESPACE.
 
#include <iostream>
 #include <nlohmann/json.hpp>
 
@@ -14,4 +14,4 @@
     std::cout << QUOTE(NLOHMANN_JSON_NAMESPACE) << std::endl;
 }
 
 
Output:
 
nlohmann::json_abi_v3_12_0
-
 
 
See also
  
Version history
 
     
  • Added in version 3.11.0. Changed inline namespace name in version 3.11.2.
    •  
   
 
   
  
 
 
 
 
 
 Copyright © 2013-2025 Niels Lohmann 
 
 
             
 
 
 
 
 
 
 
     
\ No newline at end of file
+

See also

Version history

  • Added in version 3.11.0. Changed inline namespace name in version 3.11.2.
Copyright © 2013-2025 Niels Lohmann
\ No newline at end of file diff --git a/api/macros/nlohmann_json_namespace_begin/index.html b/api/macros/nlohmann_json_namespace_begin/index.html index 6da78e221..b629576a8 100644 --- a/api/macros/nlohmann_json_namespace_begin/index.html +++ b/api/macros/nlohmann_json_namespace_begin/index.html @@ -1,4 +1,4 @@ - NLOHMANN_JSON_NAMESPACE_BEGIN, NLOHMANN_JSON_NAMESPACE_END - JSON for Modern C++
Skip to content

NLOHMANN_JSON_NAMESPACE_BEGIN, NLOHMANN_JSON_NAMESPACE_END

#define NLOHMANN_JSON_NAMESPACE_BEGIN /* value */  // (1)
+ NLOHMANN_JSON_NAMESPACE_BEGIN, NLOHMANN_JSON_NAMESPACE_END - JSON for Modern C++      
 
 
  
 
  
 
 
 
 
  
 
 
 
 
 
  
 
 
 
 
       
NLOHMANN_JSON_NAMESPACE_BEGIN, NLOHMANN_JSON_NAMESPACE_END
 
#define NLOHMANN_JSON_NAMESPACE_BEGIN /* value */  // (1)
 #define NLOHMANN_JSON_NAMESPACE_END   /* value */  // (2)
 
 
These macros can be used to open and close the nlohmann namespace. See nlohmann Namespace for details.
 
     
  1. Opens the namespace.
    2.  
  2. Closes the namespace.
    3.  
 
Default definition
 
The default definitions open and close the nlohmann namespace. The precise definition of [NLOHMANN_JSON_NAMESPACE_BEGIN] varies as described here.
 
     
  1.  
    Default definition of NLOHMANN_JSON_NAMESPACE_BEGIN:
     
    namespace nlohmann
 {
@@ -40,4 +40,4 @@
     std::cout << j << std::endl;
 }
 
     
    Output:
     
    [1,null]
-
      
    See also
      
    Version history
     
       
    • Added in version 3.11.0. Changed inline namespace name in version 3.11.2.
      •  
       
 
   
  
 
 
 
 
 
 Copyright © 2013-2025 Niels Lohmann 
 
 
             
 
 
 
 
 
 
 
     
\ No newline at end of file
+

See also

Version history

  • Added in version 3.11.0. Changed inline namespace name in version 3.11.2.
Copyright © 2013-2025 Niels Lohmann
\ No newline at end of file diff --git a/api/macros/nlohmann_json_namespace_no_version/index.html b/api/macros/nlohmann_json_namespace_no_version/index.html index 38ac41140..074852ae2 100644 --- a/api/macros/nlohmann_json_namespace_no_version/index.html +++ b/api/macros/nlohmann_json_namespace_no_version/index.html @@ -1,4 +1,4 @@ - NLOHMANN_JSON_NAMESPACE_NO_VERSION - JSON for Modern C++
Skip to content

NLOHMANN_JSON_NAMESPACE_NO_VERSION

#define NLOHMANN_JSON_NAMESPACE_NO_VERSION /* value */
+ NLOHMANN_JSON_NAMESPACE_NO_VERSION - JSON for Modern C++      
 
 
  
 
  
 
 
 
 
  
 
 
 
 
 
  
 
 
 
 
       
NLOHMANN_JSON_NAMESPACE_NO_VERSION
 
#define NLOHMANN_JSON_NAMESPACE_NO_VERSION /* value */
 
 
If defined to 1, the version component is omitted from the inline namespace. See nlohmann Namespace for details.
 
Default definition
 
The default value is 0.
 
#define NLOHMANN_JSON_NAMESPACE_NO_VERSION 0
 
 
When the macro is not defined, the library will define it to its default value.
 
Examples
 
 Example 
The example shows how to use NLOHMANN_JSON_NAMESPACE_NO_VERSION to disable the version component of the inline namespace.
 
#include <iostream>
 
@@ -14,4 +14,4 @@
     std::cout << QUOTE(NLOHMANN_JSON_NAMESPACE) << std::endl;
 }
 
 
Output:
 
nlohmann::json_abi
-
 
 
See also
  
Version history
 
     
  • Added in version 3.11.2.
    •  
   
 
   
  
 
 
 
 
 
 Copyright © 2013-2025 Niels Lohmann 
 
 
             
 
 
 
 
 
 
 
     
\ No newline at end of file
+

See also

Version history

  • Added in version 3.11.2.
Copyright © 2013-2025 Niels Lohmann
\ No newline at end of file diff --git a/api/macros/nlohmann_json_serialize_enum/index.html b/api/macros/nlohmann_json_serialize_enum/index.html index 707da1fcb..37e5a93b3 100644 --- a/api/macros/nlohmann_json_serialize_enum/index.html +++ b/api/macros/nlohmann_json_serialize_enum/index.html @@ -1,4 +1,4 @@ - NLOHMANN_JSON_SERIALIZE_ENUM - JSON for Modern C++
Skip to content

NLOHMANN_JSON_SERIALIZE_ENUM

#define NLOHMANN_JSON_SERIALIZE_ENUM(type, conversion...)
+ NLOHMANN_JSON_SERIALIZE_ENUM - JSON for Modern C++      
 
 
  
 
  
 
 
 
 
  
 
 
 
 
 
  
 
 
 
 
       
NLOHMANN_JSON_SERIALIZE_ENUM
 
#define NLOHMANN_JSON_SERIALIZE_ENUM(type, conversion...)
 
 
By default, enum values are serialized to JSON as integers. In some cases, this could result in undesired behavior. If an enum is modified or re-ordered after data has been serialized to JSON, the later deserialized JSON data may be undefined or a different enum value than was originally intended.
 
The NLOHMANN_JSON_SERIALIZE_ENUM allows to define a user-defined serialization for every enumerator.
 
Parameters
 
 
type (in)
 
name of the enum to serialize/deserialize
 
conversion (in)
 
a pair of an enumerator and a JSON serialization; arbitrary pairs can be given as a comma-separated list
 
 
Default definition
 
The macro adds two functions to the namespace which take care of the serialization and deserialization:
 
template<typename BasicJsonType>
 inline void to_json(BasicJsonType& j, const type& e);
 template<typename BasicJsonType>
@@ -101,4 +101,4 @@
 
 
Output:
 
0 -> "red"
 "rot" -> 0
 "red" -> 0
-
  
See also
  
Version history
 
Added in version 3.4.0.
   
 
   
  
 
 
 
 
 
 Copyright © 2013-2025 Niels Lohmann 
 
 
             
 
 
 
 
 
 
 
     
\ No newline at end of file
+

See also

Version history

Added in version 3.4.0.

Copyright © 2013-2025 Niels Lohmann
\ No newline at end of file diff --git a/api/macros/nlohmann_json_version_major/index.html b/api/macros/nlohmann_json_version_major/index.html index 85a97ccd3..8dcbc597f 100644 --- a/api/macros/nlohmann_json_version_major/index.html +++ b/api/macros/nlohmann_json_version_major/index.html @@ -1,4 +1,4 @@ - NLOHMANN_JSON_VERSION_MAJOR, NLOHMANN_JSON_VERSION_MINOR, NLOHMANN_JSON_VERSION_PATCH - JSON for Modern C++
Skip to content

NLOHMANN_JSON_VERSION_MAJOR, NLOHMANN_JSON_VERSION_MINOR, NLOHMANN_JSON_VERSION_PATCH

#define NLOHMANN_JSON_VERSION_MAJOR /* value */
+ NLOHMANN_JSON_VERSION_MAJOR, NLOHMANN_JSON_VERSION_MINOR, NLOHMANN_JSON_VERSION_PATCH - JSON for Modern C++      
 
 
  
 
  
 
 
 
 
  
 
 
 
 
 
  
 
 
 
 
       
NLOHMANN_JSON_VERSION_MAJOR, NLOHMANN_JSON_VERSION_MINOR, NLOHMANN_JSON_VERSION_PATCH
 
#define NLOHMANN_JSON_VERSION_MAJOR /* value */
 #define NLOHMANN_JSON_VERSION_MINOR /* value */
 #define NLOHMANN_JSON_VERSION_PATCH /* value */
 
 
These macros are defined by the library and contain the version numbers according to Semantic Versioning 2.0.0.
 
Default definition
 
The macros are defined according to the current library version.
 
Examples
 
 Example 
The example below shows how NLOHMANN_JSON_VERSION_MAJOR, NLOHMANN_JSON_VERSION_MINOR, and NLOHMANN_JSON_VERSION_PATCH are defined by the library.
 
#include <iostream>
@@ -14,4 +14,4 @@
               << NLOHMANN_JSON_VERSION_PATCH << std::endl;
 }
 
 
Output:
 
JSON for Modern C++ version 3.12.0
-
 
 
See also
  
Version history
 
     
  • Added in version 3.1.0.
    •  
   
 
   
  
 
 
 
 
 
 Copyright © 2013-2025 Niels Lohmann 
 
 
             
 
 
 
 
 
 
 
     
\ No newline at end of file
+

See also

Version history

  • Added in version 3.1.0.
Copyright © 2013-2025 Niels Lohmann
\ No newline at end of file diff --git a/api/operator_gtgt/index.html b/api/operator_gtgt/index.html index 50a199c9c..4799aac53 100644 --- a/api/operator_gtgt/index.html +++ b/api/operator_gtgt/index.html @@ -1,4 +1,4 @@ - operator>>(basic_json) - JSON for Modern C++
Skip to content

nlohmann::operator>>(basic_json)

std::istream& operator>>(std::istream& i, basic_json& j);
+ operator>>(basic_json) - JSON for Modern C++      
 
 
  
 
  
 
 
 
 
  
 
 
 
 
 
  
 
 
 
 
       
nlohmann::operator>>(basic_json)
 
std::istream& operator>>(std::istream& i, basic_json& j);
 
 
Deserializes an input stream to a JSON value.
 
Parameters
 
 
i (in, out)
 
input stream to read a serialized JSON value from
 
j (in, out)
 
JSON value to write the deserialized input to
 
 
Return value
 
the stream i
 
Exceptions
  
Complexity
 
Linear in the length of the input. The parser is a predictive LL(1) parser.
 
Notes
 
A UTF-8 byte order mark is silently ignored.
 
 
Deprecation
 
This function replaces function std::istream& operator<<(basic_json& j, std::istream& i) which has been deprecated in version 3.0.0. It will be removed in version 4.0.0. Please replace calls like j << i; with i >> j;.
 
 
Examples
 
 Example 
The example below shows how a JSON value is constructed by reading a serialization from a stream.
 
#include <iostream>
 #include <iomanip>
 #include <sstream>
@@ -38,4 +38,4 @@
   "number": 23,
   "string": "Hello, world!"
 }
-
 
 
See also
 
     
  • accept - check if the input is valid JSON
    •  
  • parse - deserialize from a compatible input
    •  
 
Version history
 
     
  • Added in version 1.0.0. Deprecated in version 3.0.0.
    •  
   
 
   
  
 
 
 
 
 
 Copyright © 2013-2025 Niels Lohmann 
 
 
             
 
 
 
 
 
 
 
     
\ No newline at end of file
+

See also

  • accept - check if the input is valid JSON
  • parse - deserialize from a compatible input

Version history

  • Added in version 1.0.0. Deprecated in version 3.0.0.
Copyright © 2013-2025 Niels Lohmann
\ No newline at end of file diff --git a/api/operator_literal_json/index.html b/api/operator_literal_json/index.html index f03cdb541..b74dda148 100644 --- a/api/operator_literal_json/index.html +++ b/api/operator_literal_json/index.html @@ -1,4 +1,4 @@ - operator""_json - JSON for Modern C++
Skip to content

nlohmann::operator""_json

json operator ""_json(const char* s, std::size_t n);
+ operator""_json - JSON for Modern C++      
 
 
  
 
  
 
 
 
 
  
 
 
 
 
 
  
 
 
 
 
       
nlohmann::operator""_json
 
json operator ""_json(const char* s, std::size_t n);
 
 
This operator implements a user-defined string literal for JSON objects. It can be used by adding _json to a string literal and returns a json object if no parse error occurred.
 
It is recommended to bring the operator into scope using any of the following lines: 
using nlohmann::literals::operator ""_json;
 using namespace nlohmann::literals;
 using namespace nlohmann::json_literals;
@@ -21,4 +21,4 @@
   "answer": 42,
   "hello": "world"
 }
-
  
Version history
 
     
  • Added in version 1.0.0.
    •  
  • Moved to namespace nlohmann::literals::json_literals in 3.11.0.
    •  
   
 
   
  
 
 
 
 
 
 Copyright © 2013-2025 Niels Lohmann 
 
 
             
 
 
 
 
 
 
 
     
\ No newline at end of file
+

Version history

  • Added in version 1.0.0.
  • Moved to namespace nlohmann::literals::json_literals in 3.11.0.
Copyright © 2013-2025 Niels Lohmann
\ No newline at end of file diff --git a/api/operator_literal_json_pointer/index.html b/api/operator_literal_json_pointer/index.html index f9f0f4eaa..6acd906e8 100644 --- a/api/operator_literal_json_pointer/index.html +++ b/api/operator_literal_json_pointer/index.html @@ -1,4 +1,4 @@ - operator""_json_pointer - JSON for Modern C++
Skip to content

nlohmann::operator""_json_pointer

json_pointer operator ""_json_pointer(const char* s, std::size_t n);
+ operator""_json_pointer - JSON for Modern C++      
 
 
  
 
  
 
 
 
 
  
 
 
 
 
 
  
 
 
 
 
       
nlohmann::operator""_json_pointer
 
json_pointer operator ""_json_pointer(const char* s, std::size_t n);
 
 
This operator implements a user-defined string literal for JSON Pointers. It can be used by adding _json_pointer to a string literal and returns a json_pointer object if no parse error occurred.
 
It is recommended to bring the operator into scope using any of the following lines: 
using nlohmann::literals::operator ""_json_pointer;
 using namespace nlohmann::literals;
 using namespace nlohmann::json_literals;
@@ -19,4 +19,4 @@
     std::cout << std::setw(2) << val << '\n';
 }
 
 
Output:
 
"world"
-
  
See also
  
Version history
 
     
  • Added in version 2.0.0.
    •  
  • Moved to namespace nlohmann::literals::json_literals in 3.11.0.
    •  
   
 
   
  
 
 
 
 
 
 Copyright © 2013-2025 Niels Lohmann 
 
 
             
 
 
 
 
 
 
 
     
\ No newline at end of file
+

See also

Version history

  • Added in version 2.0.0.
  • Moved to namespace nlohmann::literals::json_literals in 3.11.0.
Copyright © 2013-2025 Niels Lohmann
\ No newline at end of file diff --git a/api/operator_ltlt/index.html b/api/operator_ltlt/index.html index 1fafc5c9e..6b7af53d7 100644 --- a/api/operator_ltlt/index.html +++ b/api/operator_ltlt/index.html @@ -1,4 +1,4 @@ - operator<<(basic_json), operator<<(json_pointer) - JSON for Modern C++
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nlohmann::operator<<(basic_json), nlohmann::operator<<(json_pointer)

std::ostream& operator<<(std::ostream& o, const basic_json& j);      // (1)
+ operator<<(basic_json), operator<<(json_pointer) - JSON for Modern C++      
 
 
  
 
  
 
 
 
 
  
 
 
 
 
 
  
 
 
 
 
       
nlohmann::operator<<(basic_json), nlohmann::operator<<(json_pointer)
 
std::ostream& operator<<(std::ostream& o, const basic_json& j);      // (1)
 
 std::ostream& operator<<(std::ostream& o, const json_pointer& ptr);  // (2)
 
 
     
  1. Serialize the given JSON value j to the output stream o. The JSON value will be serialized using the dump member function.
       
    • The indentation of the output can be controlled with the member variable width of the output stream o. For instance, using the manipulator std::setw(4) on o sets the indentation level to 4 and the serialization result is the same as calling dump(4).
      •  
    • The indentation character can be controlled with the member variable fill of the output stream o. For instance, the manipulator std::setfill('\\t') sets indentation to use a tab character rather than the default space character.
      •  
     
    2.  
  2. Write a string representation of the given JSON pointer ptr to the output stream o. The string representation is obtained using the to_string member function.
    3.  
 
Parameters
 
 
o (in, out)
 
stream to write to
 
j (in)
 
JSON value to serialize
 
ptr (in)
 
JSON pointer to write
 
 
Return value
 
the stream o
 
Exceptions
 
     
  1. Throws type_error.316 if a string stored inside the JSON value is not UTF-8 encoded. Note that unlike the dump member functions, no error_handler can be set.
    2.  
  2. None.
    3.  
 
Complexity
 
Linear.
 
Notes
 
 
Deprecation
 
Function std::ostream& operator<<(std::ostream& o, const basic_json& j) replaces function std::ostream& operator>>(const basic_json& j, std::ostream& o) which has been deprecated in version 3.0.0. It will be removed in version 4.0.0. Please replace calls like j >> o; with o << j;.
 
 
Examples
 
 Example: (1) serialize JSON value to stream 
The example below shows the serialization with different parameters to width to adjust the indentation level.
 
#include <iostream>
@@ -57,4 +57,4 @@
     std::cout << ptr << std::endl;
 }
 
 
Output:
 
/foo/bar/baz
-
 
 
Version history
 
     
  1. Added in version 1.0.0. Added support for indentation character and deprecated std::ostream& operator>>(const basic_json& j, std::ostream& o) in version 3.0.0.
    2.  
  2. Added in version 3.11.0.
    3.  
   
 
   
  
 
 
 
 
 
 Copyright © 2013-2025 Niels Lohmann 
 
 
             
 
 
 
 
 
 
 
     
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+

Version history

  1. Added in version 1.0.0. Added support for indentation character and deprecated std::ostream& operator>>(const basic_json& j, std::ostream& o) in version 3.0.0.
  2. Added in version 3.11.0.
Copyright © 2013-2025 Niels Lohmann
\ No newline at end of file diff --git a/api/ordered_json/index.html b/api/ordered_json/index.html index 54bf84d91..20b3020f4 100644 --- a/api/ordered_json/index.html +++ b/api/ordered_json/index.html @@ -1,4 +1,4 @@ - ordered_json - JSON for Modern C++
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nlohmann::ordered_json

using ordered_json = basic_json<ordered_map>;
+ ordered_json - JSON for Modern C++      
 
 
  
 
  
 
 
 
 
  
 
 
 
 
 
  
 
 
 
 
       
nlohmann::ordered_json
 
using ordered_json = basic_json<ordered_map>;
 
 
This type preserves the insertion order of object keys.
 
Iterator invalidation
 
The type is based on ordered_map which in turn uses a std::vector to store object elements. Therefore, adding object elements can yield a reallocation in which case all iterators (including the end() iterator) and all references to the elements are invalidated. Also, any iterator or reference after the insertion point will point to the same index, which is now a different value.
 
Examples
 
 Example 
The example below demonstrates how ordered_json preserves the insertion order of object keys.
 
#include <iostream>
 #include <nlohmann/json.hpp>
 
@@ -18,4 +18,4 @@
   "two": 2,
   "three": 3
 }
-
 
 
See also
  
Version history
 
Since version 3.9.0.
   
 
   
  
 
 
 
 
 
 Copyright © 2013-2025 Niels Lohmann 
 
 
             
 
 
 
 
 
 
 
     
\ No newline at end of file
+

See also

Version history

Since version 3.9.0.

Copyright © 2013-2025 Niels Lohmann
\ No newline at end of file diff --git a/api/ordered_map/index.html b/api/ordered_map/index.html index c6ae785e3..de21cf07d 100644 --- a/api/ordered_map/index.html +++ b/api/ordered_map/index.html @@ -1,4 +1,4 @@ - ordered_map - JSON for Modern C++
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nlohmann::ordered_map

template<class Key, class T, class IgnoredLess = std::less<Key>,
+ ordered_map - JSON for Modern C++      
 
 
  
 
  
 
 
 
 
  
 
 
 
 
 
  
 
 
 
 
       
nlohmann::ordered_map
 
template<class Key, class T, class IgnoredLess = std::less<Key>,
          class Allocator = std::allocator<std::pair<const Key, T>>>
 struct ordered_map : std::vector<std::pair<const Key, T>, Allocator>;
 
 
A minimal map-like container that preserves insertion order for use within nlohmann::ordered_json (nlohmann::basic_json<ordered_map>).
 
Template parameters
 
 
Key
 
key type
 
T
 
mapped type
 
IgnoredLess
 
comparison function (ignored and only added to ensure compatibility with std::map)
 
Allocator
 
allocator type
 
 
Iterator invalidation
 
The type uses a std::vector to store object elements. Therefore, adding elements can yield a reallocation in which case all iterators (including the end() iterator) and all references to the elements are invalidated.
 
Member types
 
     
  • key_type - key type (Key)
    •  
  • mapped_type - mapped type (T)
    •  
  • Container - base container type (std::vector<std::pair<const Key, T>, Allocator>)
    •  
  • iterator
    •  
  • const_iterator
    •  
  • size_type
    •  
  • value_type
    •  
  • key_compare - key comparison function 
    std::equal_to<Key>  // until C++14
@@ -51,4 +51,4 @@
 m_std = { one:eins three:drei two:zwei }
 m_ordered = { two:zwei three:drei one:eins }
 m_std = { one:eins three:drei two:zwei }
-
      
    See also
      
    Version history
        
 
   
  
 
 
 
 
 
 Copyright © 2013-2025 Niels Lohmann 
 
 
             
 
 
 
 
 
 
 
     
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+

See also

Version history

Copyright © 2013-2025 Niels Lohmann
\ No newline at end of file diff --git a/assets/external/fonts.googleapis.com/css.61a430c9.css b/assets/external/fonts.googleapis.com/css.61a430c9.css index 9a85686fc..cc18634a9 100644 --- a/assets/external/fonts.googleapis.com/css.61a430c9.css +++ b/assets/external/fonts.googleapis.com/css.61a430c9.css @@ -4,7 +4,7 @@ font-style: italic; font-weight: 400; font-display: fallback; - src: url(../fonts.gstatic.com/s/jetbrainsmono/v20/tDbp2o-flEEny0FZhsfKu5WU4xD-IQ-PuZJJXxfpAO-LfjGbsVNLG7DGdF6OZ1PszQMgo-8.woff2) format('woff2'); + src: url(../fonts.gstatic.com/s/jetbrainsmono/v23/tDbp2o-flEEny0FZhsfKu5WU4xD-IQ-PuZJJXxfpAO-LfjGbsVNLG7DGdF6OZ1PszQMgo-8.woff2) format('woff2'); unicode-range: U+0460-052F, U+1C80-1C8A, U+20B4, U+2DE0-2DFF, U+A640-A69F, U+FE2E-FE2F; } /* cyrillic */ @@ -13,7 +13,7 @@ font-style: italic; font-weight: 400; font-display: fallback; - src: url(../fonts.gstatic.com/s/jetbrainsmono/v20/tDbp2o-flEEny0FZhsfKu5WU4xD-IQ-PuZJJXxfpAO-LfjGbsVNLG7DGdF6OZ1PsxAMgo-8.woff2) format('woff2'); + src: url(../fonts.gstatic.com/s/jetbrainsmono/v23/tDbp2o-flEEny0FZhsfKu5WU4xD-IQ-PuZJJXxfpAO-LfjGbsVNLG7DGdF6OZ1PsxAMgo-8.woff2) format('woff2'); unicode-range: U+0301, U+0400-045F, U+0490-0491, U+04B0-04B1, U+2116; } /* greek */ @@ -22,7 +22,7 @@ font-style: italic; font-weight: 400; font-display: fallback; - src: url(../fonts.gstatic.com/s/jetbrainsmono/v20/tDbp2o-flEEny0FZhsfKu5WU4xD-IQ-PuZJJXxfpAO-LfjGbsVNLG7DGdF6OZ1PswwMgo-8.woff2) format('woff2'); + src: url(../fonts.gstatic.com/s/jetbrainsmono/v23/tDbp2o-flEEny0FZhsfKu5WU4xD-IQ-PuZJJXxfpAO-LfjGbsVNLG7DGdF6OZ1PswwMgo-8.woff2) format('woff2'); unicode-range: U+0370-0377, U+037A-037F, U+0384-038A, U+038C, U+038E-03A1, U+03A3-03FF; } /* vietnamese */ @@ -31,7 +31,7 @@ font-style: italic; font-weight: 400; font-display: fallback; - src: url(../fonts.gstatic.com/s/jetbrainsmono/v20/tDbp2o-flEEny0FZhsfKu5WU4xD-IQ-PuZJJXxfpAO-LfjGbsVNLG7DGdF6OZ1PszwMgo-8.woff2) format('woff2'); + src: url(../fonts.gstatic.com/s/jetbrainsmono/v23/tDbp2o-flEEny0FZhsfKu5WU4xD-IQ-PuZJJXxfpAO-LfjGbsVNLG7DGdF6OZ1PszwMgo-8.woff2) format('woff2'); unicode-range: U+0102-0103, U+0110-0111, U+0128-0129, U+0168-0169, U+01A0-01A1, U+01AF-01B0, U+0300-0301, U+0303-0304, U+0308-0309, U+0323, U+0329, U+1EA0-1EF9, U+20AB; } /* latin-ext */ @@ -40,7 +40,7 @@ font-style: italic; font-weight: 400; font-display: fallback; - src: url(../fonts.gstatic.com/s/jetbrainsmono/v20/tDbp2o-flEEny0FZhsfKu5WU4xD-IQ-PuZJJXxfpAO-LfjGbsVNLG7DGdF6OZ1PszgMgo-8.woff2) format('woff2'); + src: url(../fonts.gstatic.com/s/jetbrainsmono/v23/tDbp2o-flEEny0FZhsfKu5WU4xD-IQ-PuZJJXxfpAO-LfjGbsVNLG7DGdF6OZ1PszgMgo-8.woff2) format('woff2'); unicode-range: U+0100-02BA, U+02BD-02C5, U+02C7-02CC, U+02CE-02D7, U+02DD-02FF, U+0304, U+0308, U+0329, U+1D00-1DBF, U+1E00-1E9F, U+1EF2-1EFF, U+2020, U+20A0-20AB, U+20AD-20C0, U+2113, U+2C60-2C7F, U+A720-A7FF; } /* latin */ @@ -49,7 +49,7 @@ font-style: italic; font-weight: 400; font-display: fallback; - src: url(../fonts.gstatic.com/s/jetbrainsmono/v20/tDbp2o-flEEny0FZhsfKu5WU4xD-IQ-PuZJJXxfpAO-LfjGbsVNLG7DGdF6OZ1PswAMg.woff2) format('woff2'); + src: url(../fonts.gstatic.com/s/jetbrainsmono/v23/tDbp2o-flEEny0FZhsfKu5WU4xD-IQ-PuZJJXxfpAO-LfjGbsVNLG7DGdF6OZ1PswAMg.woff2) format('woff2'); unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD; } /* cyrillic-ext */ @@ -58,7 +58,7 @@ font-style: italic; font-weight: 700; font-display: fallback; - src: url(../fonts.gstatic.com/s/jetbrainsmono/v20/tDbp2o-flEEny0FZhsfKu5WU4xD-IQ-PuZJJXxfpAO-LfjGbsVNLG7DGdF6OZ1PszQMgo-8.woff2) format('woff2'); + src: url(../fonts.gstatic.com/s/jetbrainsmono/v23/tDbp2o-flEEny0FZhsfKu5WU4xD-IQ-PuZJJXxfpAO-LfjGbsVNLG7DGdF6OZ1PszQMgo-8.woff2) format('woff2'); unicode-range: U+0460-052F, U+1C80-1C8A, U+20B4, U+2DE0-2DFF, U+A640-A69F, U+FE2E-FE2F; } /* cyrillic */ @@ -67,7 +67,7 @@ font-style: italic; font-weight: 700; font-display: fallback; - src: url(../fonts.gstatic.com/s/jetbrainsmono/v20/tDbp2o-flEEny0FZhsfKu5WU4xD-IQ-PuZJJXxfpAO-LfjGbsVNLG7DGdF6OZ1PsxAMgo-8.woff2) format('woff2'); + src: url(../fonts.gstatic.com/s/jetbrainsmono/v23/tDbp2o-flEEny0FZhsfKu5WU4xD-IQ-PuZJJXxfpAO-LfjGbsVNLG7DGdF6OZ1PsxAMgo-8.woff2) format('woff2'); unicode-range: U+0301, U+0400-045F, U+0490-0491, U+04B0-04B1, U+2116; } /* greek */ @@ -76,7 +76,7 @@ font-style: italic; font-weight: 700; font-display: fallback; - src: url(../fonts.gstatic.com/s/jetbrainsmono/v20/tDbp2o-flEEny0FZhsfKu5WU4xD-IQ-PuZJJXxfpAO-LfjGbsVNLG7DGdF6OZ1PswwMgo-8.woff2) format('woff2'); + src: url(../fonts.gstatic.com/s/jetbrainsmono/v23/tDbp2o-flEEny0FZhsfKu5WU4xD-IQ-PuZJJXxfpAO-LfjGbsVNLG7DGdF6OZ1PswwMgo-8.woff2) format('woff2'); unicode-range: U+0370-0377, U+037A-037F, U+0384-038A, U+038C, U+038E-03A1, U+03A3-03FF; } /* vietnamese */ @@ -85,7 +85,7 @@ font-style: italic; font-weight: 700; font-display: fallback; - src: url(../fonts.gstatic.com/s/jetbrainsmono/v20/tDbp2o-flEEny0FZhsfKu5WU4xD-IQ-PuZJJXxfpAO-LfjGbsVNLG7DGdF6OZ1PszwMgo-8.woff2) format('woff2'); + src: url(../fonts.gstatic.com/s/jetbrainsmono/v23/tDbp2o-flEEny0FZhsfKu5WU4xD-IQ-PuZJJXxfpAO-LfjGbsVNLG7DGdF6OZ1PszwMgo-8.woff2) format('woff2'); unicode-range: U+0102-0103, U+0110-0111, U+0128-0129, U+0168-0169, U+01A0-01A1, U+01AF-01B0, U+0300-0301, U+0303-0304, U+0308-0309, U+0323, U+0329, U+1EA0-1EF9, U+20AB; } /* latin-ext */ @@ -94,7 +94,7 @@ font-style: italic; font-weight: 700; font-display: fallback; - src: url(../fonts.gstatic.com/s/jetbrainsmono/v20/tDbp2o-flEEny0FZhsfKu5WU4xD-IQ-PuZJJXxfpAO-LfjGbsVNLG7DGdF6OZ1PszgMgo-8.woff2) format('woff2'); + src: url(../fonts.gstatic.com/s/jetbrainsmono/v23/tDbp2o-flEEny0FZhsfKu5WU4xD-IQ-PuZJJXxfpAO-LfjGbsVNLG7DGdF6OZ1PszgMgo-8.woff2) format('woff2'); unicode-range: U+0100-02BA, U+02BD-02C5, U+02C7-02CC, U+02CE-02D7, U+02DD-02FF, U+0304, U+0308, U+0329, U+1D00-1DBF, U+1E00-1E9F, U+1EF2-1EFF, U+2020, U+20A0-20AB, U+20AD-20C0, U+2113, U+2C60-2C7F, U+A720-A7FF; } /* latin */ @@ -103,7 +103,7 @@ font-style: italic; font-weight: 700; font-display: fallback; - src: url(../fonts.gstatic.com/s/jetbrainsmono/v20/tDbp2o-flEEny0FZhsfKu5WU4xD-IQ-PuZJJXxfpAO-LfjGbsVNLG7DGdF6OZ1PswAMg.woff2) format('woff2'); + src: url(../fonts.gstatic.com/s/jetbrainsmono/v23/tDbp2o-flEEny0FZhsfKu5WU4xD-IQ-PuZJJXxfpAO-LfjGbsVNLG7DGdF6OZ1PswAMg.woff2) format('woff2'); unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD; } /* cyrillic-ext */ @@ -112,7 +112,7 @@ font-style: normal; font-weight: 400; font-display: fallback; - src: url(../fonts.gstatic.com/s/jetbrainsmono/v20/tDbv2o-flEEny0FZhsfKu5WU4zr3E_BX0PnT8RD8yKwBNntkaToggR7BYRbKPx3cwhsk.woff2) format('woff2'); + src: url(../fonts.gstatic.com/s/jetbrainsmono/v23/tDbv2o-flEEny0FZhsfKu5WU4zr3E_BX0PnT8RD8yKwBNntkaToggR7BYRbKPx3cwhsk.woff2) format('woff2'); unicode-range: U+0460-052F, U+1C80-1C8A, U+20B4, U+2DE0-2DFF, U+A640-A69F, U+FE2E-FE2F; } /* cyrillic */ @@ -121,7 +121,7 @@ font-style: normal; font-weight: 400; font-display: fallback; - src: url(../fonts.gstatic.com/s/jetbrainsmono/v20/tDbv2o-flEEny0FZhsfKu5WU4zr3E_BX0PnT8RD8yKwBNntkaToggR7BYRbKPxTcwhsk.woff2) format('woff2'); + src: url(../fonts.gstatic.com/s/jetbrainsmono/v23/tDbv2o-flEEny0FZhsfKu5WU4zr3E_BX0PnT8RD8yKwBNntkaToggR7BYRbKPxTcwhsk.woff2) format('woff2'); unicode-range: U+0301, U+0400-045F, U+0490-0491, U+04B0-04B1, U+2116; } /* greek */ @@ -130,7 +130,7 @@ font-style: normal; font-weight: 400; font-display: fallback; - src: url(../fonts.gstatic.com/s/jetbrainsmono/v20/tDbv2o-flEEny0FZhsfKu5WU4zr3E_BX0PnT8RD8yKwBNntkaToggR7BYRbKPxPcwhsk.woff2) format('woff2'); + src: url(../fonts.gstatic.com/s/jetbrainsmono/v23/tDbv2o-flEEny0FZhsfKu5WU4zr3E_BX0PnT8RD8yKwBNntkaToggR7BYRbKPxPcwhsk.woff2) format('woff2'); unicode-range: U+0370-0377, U+037A-037F, U+0384-038A, U+038C, U+038E-03A1, U+03A3-03FF; } /* vietnamese */ @@ -139,7 +139,7 @@ font-style: normal; font-weight: 400; font-display: fallback; - src: url(../fonts.gstatic.com/s/jetbrainsmono/v20/tDbv2o-flEEny0FZhsfKu5WU4zr3E_BX0PnT8RD8yKwBNntkaToggR7BYRbKPx_cwhsk.woff2) format('woff2'); + src: url(../fonts.gstatic.com/s/jetbrainsmono/v23/tDbv2o-flEEny0FZhsfKu5WU4zr3E_BX0PnT8RD8yKwBNntkaToggR7BYRbKPx_cwhsk.woff2) format('woff2'); unicode-range: U+0102-0103, U+0110-0111, U+0128-0129, U+0168-0169, U+01A0-01A1, U+01AF-01B0, U+0300-0301, U+0303-0304, U+0308-0309, U+0323, U+0329, U+1EA0-1EF9, U+20AB; } /* latin-ext */ @@ -148,7 +148,7 @@ font-style: normal; font-weight: 400; font-display: fallback; - src: url(../fonts.gstatic.com/s/jetbrainsmono/v20/tDbv2o-flEEny0FZhsfKu5WU4zr3E_BX0PnT8RD8yKwBNntkaToggR7BYRbKPx7cwhsk.woff2) format('woff2'); + src: url(../fonts.gstatic.com/s/jetbrainsmono/v23/tDbv2o-flEEny0FZhsfKu5WU4zr3E_BX0PnT8RD8yKwBNntkaToggR7BYRbKPx7cwhsk.woff2) format('woff2'); unicode-range: U+0100-02BA, U+02BD-02C5, U+02C7-02CC, U+02CE-02D7, U+02DD-02FF, U+0304, U+0308, U+0329, U+1D00-1DBF, U+1E00-1E9F, U+1EF2-1EFF, U+2020, U+20A0-20AB, U+20AD-20C0, U+2113, U+2C60-2C7F, U+A720-A7FF; } /* latin */ @@ -157,7 +157,7 @@ font-style: normal; font-weight: 400; font-display: fallback; - src: url(../fonts.gstatic.com/s/jetbrainsmono/v20/tDbv2o-flEEny0FZhsfKu5WU4zr3E_BX0PnT8RD8yKwBNntkaToggR7BYRbKPxDcwg.woff2) format('woff2'); + src: url(../fonts.gstatic.com/s/jetbrainsmono/v23/tDbv2o-flEEny0FZhsfKu5WU4zr3E_BX0PnT8RD8yKwBNntkaToggR7BYRbKPxDcwg.woff2) format('woff2'); unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD; } /* cyrillic-ext */ @@ -166,7 +166,7 @@ font-style: normal; font-weight: 700; font-display: fallback; - src: url(../fonts.gstatic.com/s/jetbrainsmono/v20/tDbv2o-flEEny0FZhsfKu5WU4zr3E_BX0PnT8RD8yKwBNntkaToggR7BYRbKPx3cwhsk.woff2) format('woff2'); + src: url(../fonts.gstatic.com/s/jetbrainsmono/v23/tDbv2o-flEEny0FZhsfKu5WU4zr3E_BX0PnT8RD8yKwBNntkaToggR7BYRbKPx3cwhsk.woff2) format('woff2'); unicode-range: U+0460-052F, U+1C80-1C8A, U+20B4, U+2DE0-2DFF, U+A640-A69F, U+FE2E-FE2F; } /* cyrillic */ @@ -175,7 +175,7 @@ font-style: normal; font-weight: 700; font-display: fallback; - src: url(../fonts.gstatic.com/s/jetbrainsmono/v20/tDbv2o-flEEny0FZhsfKu5WU4zr3E_BX0PnT8RD8yKwBNntkaToggR7BYRbKPxTcwhsk.woff2) format('woff2'); + src: url(../fonts.gstatic.com/s/jetbrainsmono/v23/tDbv2o-flEEny0FZhsfKu5WU4zr3E_BX0PnT8RD8yKwBNntkaToggR7BYRbKPxTcwhsk.woff2) format('woff2'); unicode-range: U+0301, U+0400-045F, U+0490-0491, U+04B0-04B1, U+2116; } /* greek */ @@ -184,7 +184,7 @@ font-style: normal; font-weight: 700; font-display: fallback; - src: url(../fonts.gstatic.com/s/jetbrainsmono/v20/tDbv2o-flEEny0FZhsfKu5WU4zr3E_BX0PnT8RD8yKwBNntkaToggR7BYRbKPxPcwhsk.woff2) format('woff2'); + src: url(../fonts.gstatic.com/s/jetbrainsmono/v23/tDbv2o-flEEny0FZhsfKu5WU4zr3E_BX0PnT8RD8yKwBNntkaToggR7BYRbKPxPcwhsk.woff2) format('woff2'); unicode-range: U+0370-0377, U+037A-037F, U+0384-038A, U+038C, U+038E-03A1, U+03A3-03FF; } /* vietnamese */ @@ -193,7 +193,7 @@ font-style: normal; font-weight: 700; font-display: fallback; - src: url(../fonts.gstatic.com/s/jetbrainsmono/v20/tDbv2o-flEEny0FZhsfKu5WU4zr3E_BX0PnT8RD8yKwBNntkaToggR7BYRbKPx_cwhsk.woff2) format('woff2'); + src: url(../fonts.gstatic.com/s/jetbrainsmono/v23/tDbv2o-flEEny0FZhsfKu5WU4zr3E_BX0PnT8RD8yKwBNntkaToggR7BYRbKPx_cwhsk.woff2) format('woff2'); unicode-range: U+0102-0103, U+0110-0111, U+0128-0129, U+0168-0169, U+01A0-01A1, U+01AF-01B0, U+0300-0301, U+0303-0304, U+0308-0309, U+0323, U+0329, U+1EA0-1EF9, U+20AB; } /* latin-ext */ @@ -202,7 +202,7 @@ font-style: normal; font-weight: 700; font-display: fallback; - src: url(../fonts.gstatic.com/s/jetbrainsmono/v20/tDbv2o-flEEny0FZhsfKu5WU4zr3E_BX0PnT8RD8yKwBNntkaToggR7BYRbKPx7cwhsk.woff2) format('woff2'); + src: url(../fonts.gstatic.com/s/jetbrainsmono/v23/tDbv2o-flEEny0FZhsfKu5WU4zr3E_BX0PnT8RD8yKwBNntkaToggR7BYRbKPx7cwhsk.woff2) format('woff2'); unicode-range: U+0100-02BA, U+02BD-02C5, U+02C7-02CC, U+02CE-02D7, U+02DD-02FF, U+0304, U+0308, U+0329, U+1D00-1DBF, U+1E00-1E9F, U+1EF2-1EFF, U+2020, U+20A0-20AB, U+20AD-20C0, U+2113, U+2C60-2C7F, U+A720-A7FF; } /* latin */ @@ -211,7 +211,7 @@ font-style: normal; font-weight: 700; font-display: fallback; - src: url(../fonts.gstatic.com/s/jetbrainsmono/v20/tDbv2o-flEEny0FZhsfKu5WU4zr3E_BX0PnT8RD8yKwBNntkaToggR7BYRbKPxDcwg.woff2) format('woff2'); + src: url(../fonts.gstatic.com/s/jetbrainsmono/v23/tDbv2o-flEEny0FZhsfKu5WU4zr3E_BX0PnT8RD8yKwBNntkaToggR7BYRbKPxDcwg.woff2) format('woff2'); unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD; } /* cyrillic-ext */ @@ -221,7 +221,7 @@ font-weight: 300; font-stretch: 100%; font-display: fallback; - src: url(../fonts.gstatic.com/s/roboto/v47/KFO5CnqEu92Fr1Mu53ZEC9_Vu3r1gIhOszmkC3kaWzU.woff2) format('woff2'); + src: url(../fonts.gstatic.com/s/roboto/v48/KFO5CnqEu92Fr1Mu53ZEC9_Vu3r1gIhOszmkC3kaWzU.woff2) format('woff2'); unicode-range: U+0460-052F, U+1C80-1C8A, U+20B4, U+2DE0-2DFF, U+A640-A69F, U+FE2E-FE2F; } /* cyrillic */ @@ -231,7 +231,7 @@ font-weight: 300; font-stretch: 100%; font-display: fallback; - src: url(../fonts.gstatic.com/s/roboto/v47/KFO5CnqEu92Fr1Mu53ZEC9_Vu3r1gIhOszmkAnkaWzU.woff2) format('woff2'); + src: url(../fonts.gstatic.com/s/roboto/v48/KFO5CnqEu92Fr1Mu53ZEC9_Vu3r1gIhOszmkAnkaWzU.woff2) format('woff2'); unicode-range: U+0301, U+0400-045F, U+0490-0491, U+04B0-04B1, U+2116; } /* greek-ext */ @@ -241,7 +241,7 @@ font-weight: 300; font-stretch: 100%; font-display: fallback; - src: url(../fonts.gstatic.com/s/roboto/v47/KFO5CnqEu92Fr1Mu53ZEC9_Vu3r1gIhOszmkCnkaWzU.woff2) format('woff2'); + src: url(../fonts.gstatic.com/s/roboto/v48/KFO5CnqEu92Fr1Mu53ZEC9_Vu3r1gIhOszmkCnkaWzU.woff2) format('woff2'); unicode-range: U+1F00-1FFF; } /* greek */ @@ -251,7 +251,7 @@ font-weight: 300; font-stretch: 100%; font-display: fallback; - src: url(../fonts.gstatic.com/s/roboto/v47/KFO5CnqEu92Fr1Mu53ZEC9_Vu3r1gIhOszmkBXkaWzU.woff2) format('woff2'); + src: url(../fonts.gstatic.com/s/roboto/v48/KFO5CnqEu92Fr1Mu53ZEC9_Vu3r1gIhOszmkBXkaWzU.woff2) format('woff2'); unicode-range: U+0370-0377, U+037A-037F, U+0384-038A, U+038C, U+038E-03A1, U+03A3-03FF; } /* math */ @@ -261,7 +261,7 @@ font-weight: 300; font-stretch: 100%; font-display: fallback; - src: url(../fonts.gstatic.com/s/roboto/v47/KFO5CnqEu92Fr1Mu53ZEC9_Vu3r1gIhOszmkenkaWzU.woff2) format('woff2'); + src: url(../fonts.gstatic.com/s/roboto/v48/KFO5CnqEu92Fr1Mu53ZEC9_Vu3r1gIhOszmkenkaWzU.woff2) format('woff2'); unicode-range: U+0302-0303, U+0305, U+0307-0308, U+0310, U+0312, U+0315, U+031A, U+0326-0327, U+032C, U+032F-0330, U+0332-0333, U+0338, U+033A, U+0346, U+034D, U+0391-03A1, U+03A3-03A9, U+03B1-03C9, U+03D1, U+03D5-03D6, U+03F0-03F1, U+03F4-03F5, U+2016-2017, U+2034-2038, U+203C, U+2040, U+2043, U+2047, U+2050, U+2057, U+205F, U+2070-2071, U+2074-208E, U+2090-209C, U+20D0-20DC, U+20E1, U+20E5-20EF, U+2100-2112, U+2114-2115, U+2117-2121, U+2123-214F, U+2190, U+2192, U+2194-21AE, U+21B0-21E5, U+21F1-21F2, U+21F4-2211, U+2213-2214, U+2216-22FF, U+2308-230B, U+2310, U+2319, U+231C-2321, U+2336-237A, U+237C, U+2395, U+239B-23B7, U+23D0, U+23DC-23E1, U+2474-2475, U+25AF, U+25B3, U+25B7, U+25BD, U+25C1, U+25CA, U+25CC, U+25FB, U+266D-266F, U+27C0-27FF, U+2900-2AFF, U+2B0E-2B11, U+2B30-2B4C, U+2BFE, U+3030, U+FF5B, U+FF5D, U+1D400-1D7FF, U+1EE00-1EEFF; } /* symbols */ @@ -271,7 +271,7 @@ font-weight: 300; font-stretch: 100%; font-display: fallback; - src: url(../fonts.gstatic.com/s/roboto/v47/KFO5CnqEu92Fr1Mu53ZEC9_Vu3r1gIhOszmkaHkaWzU.woff2) format('woff2'); + src: url(../fonts.gstatic.com/s/roboto/v48/KFO5CnqEu92Fr1Mu53ZEC9_Vu3r1gIhOszmkaHkaWzU.woff2) format('woff2'); unicode-range: U+0001-000C, U+000E-001F, U+007F-009F, U+20DD-20E0, U+20E2-20E4, U+2150-218F, U+2190, U+2192, U+2194-2199, U+21AF, U+21E6-21F0, U+21F3, U+2218-2219, U+2299, U+22C4-22C6, U+2300-243F, U+2440-244A, U+2460-24FF, U+25A0-27BF, U+2800-28FF, U+2921-2922, U+2981, U+29BF, U+29EB, U+2B00-2BFF, U+4DC0-4DFF, U+FFF9-FFFB, U+10140-1018E, U+10190-1019C, U+101A0, U+101D0-101FD, U+102E0-102FB, U+10E60-10E7E, U+1D2C0-1D2D3, U+1D2E0-1D37F, U+1F000-1F0FF, U+1F100-1F1AD, U+1F1E6-1F1FF, U+1F30D-1F30F, U+1F315, U+1F31C, U+1F31E, U+1F320-1F32C, U+1F336, U+1F378, U+1F37D, U+1F382, U+1F393-1F39F, U+1F3A7-1F3A8, U+1F3AC-1F3AF, U+1F3C2, U+1F3C4-1F3C6, U+1F3CA-1F3CE, U+1F3D4-1F3E0, U+1F3ED, U+1F3F1-1F3F3, U+1F3F5-1F3F7, U+1F408, U+1F415, U+1F41F, U+1F426, U+1F43F, U+1F441-1F442, U+1F444, U+1F446-1F449, U+1F44C-1F44E, U+1F453, U+1F46A, U+1F47D, U+1F4A3, U+1F4B0, U+1F4B3, U+1F4B9, U+1F4BB, U+1F4BF, U+1F4C8-1F4CB, U+1F4D6, U+1F4DA, U+1F4DF, U+1F4E3-1F4E6, U+1F4EA-1F4ED, U+1F4F7, U+1F4F9-1F4FB, U+1F4FD-1F4FE, U+1F503, U+1F507-1F50B, U+1F50D, U+1F512-1F513, U+1F53E-1F54A, U+1F54F-1F5FA, U+1F610, U+1F650-1F67F, U+1F687, U+1F68D, U+1F691, U+1F694, U+1F698, U+1F6AD, U+1F6B2, U+1F6B9-1F6BA, U+1F6BC, U+1F6C6-1F6CF, U+1F6D3-1F6D7, U+1F6E0-1F6EA, U+1F6F0-1F6F3, U+1F6F7-1F6FC, U+1F700-1F7FF, U+1F800-1F80B, U+1F810-1F847, U+1F850-1F859, U+1F860-1F887, U+1F890-1F8AD, U+1F8B0-1F8BB, U+1F8C0-1F8C1, U+1F900-1F90B, U+1F93B, U+1F946, U+1F984, U+1F996, U+1F9E9, U+1FA00-1FA6F, U+1FA70-1FA7C, U+1FA80-1FA89, U+1FA8F-1FAC6, U+1FACE-1FADC, U+1FADF-1FAE9, U+1FAF0-1FAF8, U+1FB00-1FBFF; } /* vietnamese */ @@ -281,7 +281,7 @@ font-weight: 300; font-stretch: 100%; font-display: fallback; - src: url(../fonts.gstatic.com/s/roboto/v47/KFO5CnqEu92Fr1Mu53ZEC9_Vu3r1gIhOszmkCXkaWzU.woff2) format('woff2'); + src: url(../fonts.gstatic.com/s/roboto/v48/KFO5CnqEu92Fr1Mu53ZEC9_Vu3r1gIhOszmkCXkaWzU.woff2) format('woff2'); unicode-range: U+0102-0103, U+0110-0111, U+0128-0129, U+0168-0169, U+01A0-01A1, U+01AF-01B0, U+0300-0301, U+0303-0304, U+0308-0309, U+0323, U+0329, U+1EA0-1EF9, U+20AB; } /* latin-ext */ @@ -291,7 +291,7 @@ font-weight: 300; font-stretch: 100%; font-display: fallback; - src: url(../fonts.gstatic.com/s/roboto/v47/KFO5CnqEu92Fr1Mu53ZEC9_Vu3r1gIhOszmkCHkaWzU.woff2) format('woff2'); + src: url(../fonts.gstatic.com/s/roboto/v48/KFO5CnqEu92Fr1Mu53ZEC9_Vu3r1gIhOszmkCHkaWzU.woff2) format('woff2'); unicode-range: U+0100-02BA, U+02BD-02C5, U+02C7-02CC, U+02CE-02D7, U+02DD-02FF, U+0304, U+0308, U+0329, U+1D00-1DBF, U+1E00-1E9F, U+1EF2-1EFF, U+2020, U+20A0-20AB, U+20AD-20C0, U+2113, U+2C60-2C7F, U+A720-A7FF; } /* latin */ @@ -301,7 +301,7 @@ font-weight: 300; font-stretch: 100%; font-display: fallback; - src: url(../fonts.gstatic.com/s/roboto/v47/KFO5CnqEu92Fr1Mu53ZEC9_Vu3r1gIhOszmkBnka.woff2) format('woff2'); + src: url(../fonts.gstatic.com/s/roboto/v48/KFO5CnqEu92Fr1Mu53ZEC9_Vu3r1gIhOszmkBnka.woff2) format('woff2'); unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD; } /* cyrillic-ext */ @@ -311,7 +311,7 @@ font-weight: 400; font-stretch: 100%; font-display: fallback; - src: url(../fonts.gstatic.com/s/roboto/v47/KFO5CnqEu92Fr1Mu53ZEC9_Vu3r1gIhOszmkC3kaWzU.woff2) format('woff2'); + src: url(../fonts.gstatic.com/s/roboto/v48/KFO5CnqEu92Fr1Mu53ZEC9_Vu3r1gIhOszmkC3kaWzU.woff2) format('woff2'); unicode-range: U+0460-052F, U+1C80-1C8A, U+20B4, U+2DE0-2DFF, U+A640-A69F, U+FE2E-FE2F; } /* cyrillic */ @@ -321,7 +321,7 @@ font-weight: 400; font-stretch: 100%; font-display: fallback; - src: url(../fonts.gstatic.com/s/roboto/v47/KFO5CnqEu92Fr1Mu53ZEC9_Vu3r1gIhOszmkAnkaWzU.woff2) format('woff2'); + src: url(../fonts.gstatic.com/s/roboto/v48/KFO5CnqEu92Fr1Mu53ZEC9_Vu3r1gIhOszmkAnkaWzU.woff2) format('woff2'); unicode-range: U+0301, U+0400-045F, U+0490-0491, U+04B0-04B1, U+2116; } /* greek-ext */ @@ -331,7 +331,7 @@ font-weight: 400; font-stretch: 100%; font-display: fallback; - src: url(../fonts.gstatic.com/s/roboto/v47/KFO5CnqEu92Fr1Mu53ZEC9_Vu3r1gIhOszmkCnkaWzU.woff2) format('woff2'); + src: url(../fonts.gstatic.com/s/roboto/v48/KFO5CnqEu92Fr1Mu53ZEC9_Vu3r1gIhOszmkCnkaWzU.woff2) format('woff2'); unicode-range: U+1F00-1FFF; } /* greek */ @@ -341,7 +341,7 @@ font-weight: 400; font-stretch: 100%; font-display: fallback; - src: url(../fonts.gstatic.com/s/roboto/v47/KFO5CnqEu92Fr1Mu53ZEC9_Vu3r1gIhOszmkBXkaWzU.woff2) format('woff2'); + src: url(../fonts.gstatic.com/s/roboto/v48/KFO5CnqEu92Fr1Mu53ZEC9_Vu3r1gIhOszmkBXkaWzU.woff2) format('woff2'); unicode-range: U+0370-0377, U+037A-037F, U+0384-038A, U+038C, U+038E-03A1, U+03A3-03FF; } /* math */ @@ -351,7 +351,7 @@ font-weight: 400; font-stretch: 100%; font-display: fallback; - src: url(../fonts.gstatic.com/s/roboto/v47/KFO5CnqEu92Fr1Mu53ZEC9_Vu3r1gIhOszmkenkaWzU.woff2) format('woff2'); + src: url(../fonts.gstatic.com/s/roboto/v48/KFO5CnqEu92Fr1Mu53ZEC9_Vu3r1gIhOszmkenkaWzU.woff2) format('woff2'); unicode-range: U+0302-0303, U+0305, U+0307-0308, U+0310, U+0312, U+0315, U+031A, U+0326-0327, U+032C, U+032F-0330, U+0332-0333, U+0338, U+033A, U+0346, U+034D, U+0391-03A1, U+03A3-03A9, U+03B1-03C9, U+03D1, U+03D5-03D6, U+03F0-03F1, U+03F4-03F5, U+2016-2017, U+2034-2038, U+203C, U+2040, U+2043, U+2047, U+2050, U+2057, U+205F, U+2070-2071, U+2074-208E, U+2090-209C, U+20D0-20DC, U+20E1, U+20E5-20EF, U+2100-2112, U+2114-2115, U+2117-2121, U+2123-214F, U+2190, U+2192, U+2194-21AE, U+21B0-21E5, U+21F1-21F2, U+21F4-2211, U+2213-2214, U+2216-22FF, U+2308-230B, U+2310, U+2319, U+231C-2321, U+2336-237A, U+237C, U+2395, U+239B-23B7, U+23D0, U+23DC-23E1, U+2474-2475, U+25AF, U+25B3, U+25B7, U+25BD, U+25C1, U+25CA, U+25CC, U+25FB, U+266D-266F, U+27C0-27FF, U+2900-2AFF, U+2B0E-2B11, U+2B30-2B4C, U+2BFE, U+3030, U+FF5B, U+FF5D, U+1D400-1D7FF, U+1EE00-1EEFF; } /* symbols */ @@ -361,7 +361,7 @@ font-weight: 400; font-stretch: 100%; font-display: fallback; - src: url(../fonts.gstatic.com/s/roboto/v47/KFO5CnqEu92Fr1Mu53ZEC9_Vu3r1gIhOszmkaHkaWzU.woff2) format('woff2'); + src: url(../fonts.gstatic.com/s/roboto/v48/KFO5CnqEu92Fr1Mu53ZEC9_Vu3r1gIhOszmkaHkaWzU.woff2) format('woff2'); unicode-range: U+0001-000C, U+000E-001F, U+007F-009F, U+20DD-20E0, U+20E2-20E4, U+2150-218F, U+2190, U+2192, U+2194-2199, U+21AF, U+21E6-21F0, U+21F3, U+2218-2219, U+2299, U+22C4-22C6, U+2300-243F, U+2440-244A, U+2460-24FF, U+25A0-27BF, U+2800-28FF, U+2921-2922, U+2981, U+29BF, U+29EB, U+2B00-2BFF, U+4DC0-4DFF, U+FFF9-FFFB, U+10140-1018E, U+10190-1019C, U+101A0, U+101D0-101FD, U+102E0-102FB, U+10E60-10E7E, U+1D2C0-1D2D3, U+1D2E0-1D37F, U+1F000-1F0FF, U+1F100-1F1AD, U+1F1E6-1F1FF, U+1F30D-1F30F, U+1F315, U+1F31C, U+1F31E, U+1F320-1F32C, U+1F336, U+1F378, U+1F37D, U+1F382, U+1F393-1F39F, U+1F3A7-1F3A8, U+1F3AC-1F3AF, U+1F3C2, U+1F3C4-1F3C6, U+1F3CA-1F3CE, U+1F3D4-1F3E0, U+1F3ED, U+1F3F1-1F3F3, U+1F3F5-1F3F7, U+1F408, U+1F415, U+1F41F, U+1F426, U+1F43F, U+1F441-1F442, U+1F444, U+1F446-1F449, U+1F44C-1F44E, U+1F453, U+1F46A, U+1F47D, U+1F4A3, U+1F4B0, U+1F4B3, U+1F4B9, U+1F4BB, U+1F4BF, U+1F4C8-1F4CB, U+1F4D6, U+1F4DA, U+1F4DF, U+1F4E3-1F4E6, U+1F4EA-1F4ED, U+1F4F7, U+1F4F9-1F4FB, U+1F4FD-1F4FE, U+1F503, U+1F507-1F50B, U+1F50D, U+1F512-1F513, U+1F53E-1F54A, U+1F54F-1F5FA, U+1F610, U+1F650-1F67F, U+1F687, U+1F68D, U+1F691, U+1F694, U+1F698, U+1F6AD, U+1F6B2, U+1F6B9-1F6BA, U+1F6BC, U+1F6C6-1F6CF, U+1F6D3-1F6D7, U+1F6E0-1F6EA, U+1F6F0-1F6F3, U+1F6F7-1F6FC, U+1F700-1F7FF, U+1F800-1F80B, U+1F810-1F847, U+1F850-1F859, U+1F860-1F887, U+1F890-1F8AD, U+1F8B0-1F8BB, U+1F8C0-1F8C1, U+1F900-1F90B, U+1F93B, U+1F946, U+1F984, U+1F996, U+1F9E9, U+1FA00-1FA6F, U+1FA70-1FA7C, U+1FA80-1FA89, U+1FA8F-1FAC6, U+1FACE-1FADC, U+1FADF-1FAE9, U+1FAF0-1FAF8, U+1FB00-1FBFF; } /* vietnamese */ @@ -371,7 +371,7 @@ font-weight: 400; font-stretch: 100%; font-display: fallback; - src: url(../fonts.gstatic.com/s/roboto/v47/KFO5CnqEu92Fr1Mu53ZEC9_Vu3r1gIhOszmkCXkaWzU.woff2) format('woff2'); + src: url(../fonts.gstatic.com/s/roboto/v48/KFO5CnqEu92Fr1Mu53ZEC9_Vu3r1gIhOszmkCXkaWzU.woff2) format('woff2'); unicode-range: U+0102-0103, U+0110-0111, U+0128-0129, U+0168-0169, U+01A0-01A1, U+01AF-01B0, U+0300-0301, U+0303-0304, U+0308-0309, U+0323, U+0329, U+1EA0-1EF9, U+20AB; } /* latin-ext */ @@ -381,7 +381,7 @@ font-weight: 400; font-stretch: 100%; font-display: fallback; - src: url(../fonts.gstatic.com/s/roboto/v47/KFO5CnqEu92Fr1Mu53ZEC9_Vu3r1gIhOszmkCHkaWzU.woff2) format('woff2'); + src: url(../fonts.gstatic.com/s/roboto/v48/KFO5CnqEu92Fr1Mu53ZEC9_Vu3r1gIhOszmkCHkaWzU.woff2) format('woff2'); unicode-range: U+0100-02BA, U+02BD-02C5, U+02C7-02CC, U+02CE-02D7, U+02DD-02FF, U+0304, U+0308, U+0329, U+1D00-1DBF, U+1E00-1E9F, U+1EF2-1EFF, U+2020, U+20A0-20AB, U+20AD-20C0, U+2113, U+2C60-2C7F, U+A720-A7FF; } /* latin */ @@ -391,7 +391,7 @@ font-weight: 400; font-stretch: 100%; font-display: fallback; - src: url(../fonts.gstatic.com/s/roboto/v47/KFO5CnqEu92Fr1Mu53ZEC9_Vu3r1gIhOszmkBnka.woff2) format('woff2'); + src: url(../fonts.gstatic.com/s/roboto/v48/KFO5CnqEu92Fr1Mu53ZEC9_Vu3r1gIhOszmkBnka.woff2) format('woff2'); unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD; } /* cyrillic-ext */ @@ -401,7 +401,7 @@ font-weight: 700; font-stretch: 100%; font-display: fallback; - src: url(../fonts.gstatic.com/s/roboto/v47/KFO5CnqEu92Fr1Mu53ZEC9_Vu3r1gIhOszmkC3kaWzU.woff2) format('woff2'); + src: url(../fonts.gstatic.com/s/roboto/v48/KFO5CnqEu92Fr1Mu53ZEC9_Vu3r1gIhOszmkC3kaWzU.woff2) format('woff2'); unicode-range: U+0460-052F, U+1C80-1C8A, U+20B4, U+2DE0-2DFF, U+A640-A69F, U+FE2E-FE2F; } /* cyrillic */ @@ -411,7 +411,7 @@ font-weight: 700; font-stretch: 100%; font-display: fallback; - src: url(../fonts.gstatic.com/s/roboto/v47/KFO5CnqEu92Fr1Mu53ZEC9_Vu3r1gIhOszmkAnkaWzU.woff2) format('woff2'); + src: url(../fonts.gstatic.com/s/roboto/v48/KFO5CnqEu92Fr1Mu53ZEC9_Vu3r1gIhOszmkAnkaWzU.woff2) format('woff2'); unicode-range: U+0301, U+0400-045F, U+0490-0491, U+04B0-04B1, U+2116; } /* greek-ext */ @@ -421,7 +421,7 @@ font-weight: 700; font-stretch: 100%; font-display: fallback; - src: url(../fonts.gstatic.com/s/roboto/v47/KFO5CnqEu92Fr1Mu53ZEC9_Vu3r1gIhOszmkCnkaWzU.woff2) format('woff2'); + src: url(../fonts.gstatic.com/s/roboto/v48/KFO5CnqEu92Fr1Mu53ZEC9_Vu3r1gIhOszmkCnkaWzU.woff2) format('woff2'); unicode-range: U+1F00-1FFF; } /* greek */ @@ -431,7 +431,7 @@ font-weight: 700; font-stretch: 100%; font-display: fallback; - src: url(../fonts.gstatic.com/s/roboto/v47/KFO5CnqEu92Fr1Mu53ZEC9_Vu3r1gIhOszmkBXkaWzU.woff2) format('woff2'); + src: url(../fonts.gstatic.com/s/roboto/v48/KFO5CnqEu92Fr1Mu53ZEC9_Vu3r1gIhOszmkBXkaWzU.woff2) format('woff2'); unicode-range: U+0370-0377, U+037A-037F, U+0384-038A, U+038C, U+038E-03A1, U+03A3-03FF; } /* math */ @@ -441,7 +441,7 @@ font-weight: 700; font-stretch: 100%; font-display: fallback; - src: url(../fonts.gstatic.com/s/roboto/v47/KFO5CnqEu92Fr1Mu53ZEC9_Vu3r1gIhOszmkenkaWzU.woff2) format('woff2'); + src: url(../fonts.gstatic.com/s/roboto/v48/KFO5CnqEu92Fr1Mu53ZEC9_Vu3r1gIhOszmkenkaWzU.woff2) format('woff2'); unicode-range: U+0302-0303, U+0305, U+0307-0308, U+0310, U+0312, U+0315, U+031A, U+0326-0327, U+032C, U+032F-0330, U+0332-0333, U+0338, U+033A, U+0346, U+034D, U+0391-03A1, U+03A3-03A9, U+03B1-03C9, U+03D1, U+03D5-03D6, U+03F0-03F1, U+03F4-03F5, U+2016-2017, U+2034-2038, U+203C, U+2040, U+2043, U+2047, U+2050, U+2057, U+205F, U+2070-2071, U+2074-208E, U+2090-209C, U+20D0-20DC, U+20E1, U+20E5-20EF, U+2100-2112, U+2114-2115, U+2117-2121, U+2123-214F, U+2190, U+2192, U+2194-21AE, U+21B0-21E5, U+21F1-21F2, U+21F4-2211, U+2213-2214, U+2216-22FF, U+2308-230B, U+2310, U+2319, U+231C-2321, U+2336-237A, U+237C, U+2395, U+239B-23B7, U+23D0, U+23DC-23E1, U+2474-2475, U+25AF, U+25B3, U+25B7, U+25BD, U+25C1, U+25CA, U+25CC, U+25FB, U+266D-266F, U+27C0-27FF, U+2900-2AFF, U+2B0E-2B11, U+2B30-2B4C, U+2BFE, U+3030, U+FF5B, U+FF5D, U+1D400-1D7FF, U+1EE00-1EEFF; } /* symbols */ @@ -451,7 +451,7 @@ font-weight: 700; font-stretch: 100%; font-display: fallback; - src: url(../fonts.gstatic.com/s/roboto/v47/KFO5CnqEu92Fr1Mu53ZEC9_Vu3r1gIhOszmkaHkaWzU.woff2) format('woff2'); + src: url(../fonts.gstatic.com/s/roboto/v48/KFO5CnqEu92Fr1Mu53ZEC9_Vu3r1gIhOszmkaHkaWzU.woff2) format('woff2'); unicode-range: U+0001-000C, U+000E-001F, U+007F-009F, U+20DD-20E0, U+20E2-20E4, U+2150-218F, U+2190, U+2192, U+2194-2199, U+21AF, U+21E6-21F0, U+21F3, U+2218-2219, U+2299, U+22C4-22C6, U+2300-243F, U+2440-244A, U+2460-24FF, U+25A0-27BF, U+2800-28FF, U+2921-2922, U+2981, U+29BF, U+29EB, U+2B00-2BFF, U+4DC0-4DFF, U+FFF9-FFFB, U+10140-1018E, U+10190-1019C, U+101A0, U+101D0-101FD, U+102E0-102FB, U+10E60-10E7E, U+1D2C0-1D2D3, U+1D2E0-1D37F, U+1F000-1F0FF, U+1F100-1F1AD, U+1F1E6-1F1FF, U+1F30D-1F30F, U+1F315, U+1F31C, U+1F31E, U+1F320-1F32C, U+1F336, U+1F378, U+1F37D, U+1F382, U+1F393-1F39F, U+1F3A7-1F3A8, U+1F3AC-1F3AF, U+1F3C2, U+1F3C4-1F3C6, U+1F3CA-1F3CE, U+1F3D4-1F3E0, U+1F3ED, U+1F3F1-1F3F3, U+1F3F5-1F3F7, U+1F408, U+1F415, U+1F41F, U+1F426, U+1F43F, U+1F441-1F442, U+1F444, U+1F446-1F449, U+1F44C-1F44E, U+1F453, U+1F46A, U+1F47D, U+1F4A3, U+1F4B0, U+1F4B3, U+1F4B9, U+1F4BB, U+1F4BF, U+1F4C8-1F4CB, U+1F4D6, U+1F4DA, U+1F4DF, U+1F4E3-1F4E6, U+1F4EA-1F4ED, U+1F4F7, U+1F4F9-1F4FB, U+1F4FD-1F4FE, U+1F503, U+1F507-1F50B, U+1F50D, U+1F512-1F513, U+1F53E-1F54A, U+1F54F-1F5FA, U+1F610, U+1F650-1F67F, U+1F687, U+1F68D, U+1F691, U+1F694, U+1F698, U+1F6AD, U+1F6B2, U+1F6B9-1F6BA, U+1F6BC, U+1F6C6-1F6CF, U+1F6D3-1F6D7, U+1F6E0-1F6EA, U+1F6F0-1F6F3, U+1F6F7-1F6FC, U+1F700-1F7FF, U+1F800-1F80B, U+1F810-1F847, U+1F850-1F859, U+1F860-1F887, U+1F890-1F8AD, U+1F8B0-1F8BB, U+1F8C0-1F8C1, U+1F900-1F90B, U+1F93B, U+1F946, U+1F984, U+1F996, U+1F9E9, U+1FA00-1FA6F, U+1FA70-1FA7C, U+1FA80-1FA89, U+1FA8F-1FAC6, U+1FACE-1FADC, U+1FADF-1FAE9, U+1FAF0-1FAF8, U+1FB00-1FBFF; } /* vietnamese */ @@ -461,7 +461,7 @@ font-weight: 700; font-stretch: 100%; font-display: fallback; - src: url(../fonts.gstatic.com/s/roboto/v47/KFO5CnqEu92Fr1Mu53ZEC9_Vu3r1gIhOszmkCXkaWzU.woff2) format('woff2'); + src: url(../fonts.gstatic.com/s/roboto/v48/KFO5CnqEu92Fr1Mu53ZEC9_Vu3r1gIhOszmkCXkaWzU.woff2) format('woff2'); unicode-range: U+0102-0103, U+0110-0111, U+0128-0129, U+0168-0169, U+01A0-01A1, U+01AF-01B0, U+0300-0301, U+0303-0304, U+0308-0309, U+0323, U+0329, U+1EA0-1EF9, U+20AB; } /* latin-ext */ @@ -471,7 +471,7 @@ font-weight: 700; font-stretch: 100%; font-display: fallback; - src: url(../fonts.gstatic.com/s/roboto/v47/KFO5CnqEu92Fr1Mu53ZEC9_Vu3r1gIhOszmkCHkaWzU.woff2) format('woff2'); + src: url(../fonts.gstatic.com/s/roboto/v48/KFO5CnqEu92Fr1Mu53ZEC9_Vu3r1gIhOszmkCHkaWzU.woff2) format('woff2'); unicode-range: U+0100-02BA, U+02BD-02C5, U+02C7-02CC, U+02CE-02D7, U+02DD-02FF, U+0304, U+0308, U+0329, U+1D00-1DBF, U+1E00-1E9F, U+1EF2-1EFF, U+2020, U+20A0-20AB, U+20AD-20C0, U+2113, U+2C60-2C7F, U+A720-A7FF; } /* latin */ @@ -481,7 +481,7 @@ font-weight: 700; font-stretch: 100%; font-display: fallback; - src: url(../fonts.gstatic.com/s/roboto/v47/KFO5CnqEu92Fr1Mu53ZEC9_Vu3r1gIhOszmkBnka.woff2) format('woff2'); + src: url(../fonts.gstatic.com/s/roboto/v48/KFO5CnqEu92Fr1Mu53ZEC9_Vu3r1gIhOszmkBnka.woff2) format('woff2'); unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD; } /* cyrillic-ext */ @@ -491,7 +491,7 @@ font-weight: 300; font-stretch: 100%; font-display: fallback; - src: url(../fonts.gstatic.com/s/roboto/v47/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3GUBGEe.woff2) format('woff2'); + src: url(../fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3GUBGEe.woff2) format('woff2'); unicode-range: U+0460-052F, U+1C80-1C8A, U+20B4, U+2DE0-2DFF, U+A640-A69F, U+FE2E-FE2F; } /* cyrillic */ @@ -501,7 +501,7 @@ font-weight: 300; font-stretch: 100%; font-display: fallback; - src: url(../fonts.gstatic.com/s/roboto/v47/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3iUBGEe.woff2) format('woff2'); + src: url(../fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3iUBGEe.woff2) format('woff2'); unicode-range: U+0301, U+0400-045F, U+0490-0491, U+04B0-04B1, U+2116; } /* greek-ext */ @@ -511,7 +511,7 @@ font-weight: 300; font-stretch: 100%; font-display: fallback; - src: url(../fonts.gstatic.com/s/roboto/v47/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3CUBGEe.woff2) format('woff2'); + src: url(../fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3CUBGEe.woff2) format('woff2'); unicode-range: U+1F00-1FFF; } /* greek */ @@ -521,7 +521,7 @@ font-weight: 300; font-stretch: 100%; font-display: fallback; - src: url(../fonts.gstatic.com/s/roboto/v47/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3-UBGEe.woff2) format('woff2'); + src: url(../fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3-UBGEe.woff2) format('woff2'); unicode-range: U+0370-0377, U+037A-037F, U+0384-038A, U+038C, U+038E-03A1, U+03A3-03FF; } /* math */ @@ -531,7 +531,7 @@ font-weight: 300; font-stretch: 100%; font-display: fallback; - src: url(../fonts.gstatic.com/s/roboto/v47/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMawCUBGEe.woff2) format('woff2'); + src: url(../fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMawCUBGEe.woff2) format('woff2'); unicode-range: U+0302-0303, U+0305, U+0307-0308, U+0310, U+0312, U+0315, U+031A, U+0326-0327, U+032C, U+032F-0330, U+0332-0333, U+0338, U+033A, U+0346, U+034D, U+0391-03A1, U+03A3-03A9, U+03B1-03C9, U+03D1, U+03D5-03D6, U+03F0-03F1, U+03F4-03F5, U+2016-2017, U+2034-2038, U+203C, U+2040, U+2043, U+2047, U+2050, U+2057, U+205F, U+2070-2071, U+2074-208E, U+2090-209C, U+20D0-20DC, U+20E1, U+20E5-20EF, U+2100-2112, U+2114-2115, U+2117-2121, U+2123-214F, U+2190, U+2192, U+2194-21AE, U+21B0-21E5, U+21F1-21F2, U+21F4-2211, U+2213-2214, U+2216-22FF, U+2308-230B, U+2310, U+2319, U+231C-2321, U+2336-237A, U+237C, U+2395, U+239B-23B7, U+23D0, U+23DC-23E1, U+2474-2475, U+25AF, U+25B3, U+25B7, U+25BD, U+25C1, U+25CA, U+25CC, U+25FB, U+266D-266F, U+27C0-27FF, U+2900-2AFF, U+2B0E-2B11, U+2B30-2B4C, U+2BFE, U+3030, U+FF5B, U+FF5D, U+1D400-1D7FF, U+1EE00-1EEFF; } /* symbols */ @@ -541,7 +541,7 @@ font-weight: 300; font-stretch: 100%; font-display: fallback; - src: url(../fonts.gstatic.com/s/roboto/v47/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMaxKUBGEe.woff2) format('woff2'); + src: url(../fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMaxKUBGEe.woff2) format('woff2'); unicode-range: U+0001-000C, U+000E-001F, U+007F-009F, U+20DD-20E0, U+20E2-20E4, U+2150-218F, U+2190, U+2192, U+2194-2199, U+21AF, U+21E6-21F0, U+21F3, U+2218-2219, U+2299, U+22C4-22C6, U+2300-243F, U+2440-244A, U+2460-24FF, U+25A0-27BF, U+2800-28FF, U+2921-2922, U+2981, U+29BF, U+29EB, U+2B00-2BFF, U+4DC0-4DFF, U+FFF9-FFFB, U+10140-1018E, U+10190-1019C, U+101A0, U+101D0-101FD, U+102E0-102FB, U+10E60-10E7E, U+1D2C0-1D2D3, U+1D2E0-1D37F, U+1F000-1F0FF, U+1F100-1F1AD, U+1F1E6-1F1FF, U+1F30D-1F30F, U+1F315, U+1F31C, U+1F31E, U+1F320-1F32C, U+1F336, U+1F378, U+1F37D, U+1F382, U+1F393-1F39F, U+1F3A7-1F3A8, U+1F3AC-1F3AF, U+1F3C2, U+1F3C4-1F3C6, U+1F3CA-1F3CE, U+1F3D4-1F3E0, U+1F3ED, U+1F3F1-1F3F3, U+1F3F5-1F3F7, U+1F408, U+1F415, U+1F41F, U+1F426, U+1F43F, U+1F441-1F442, U+1F444, U+1F446-1F449, U+1F44C-1F44E, U+1F453, U+1F46A, U+1F47D, U+1F4A3, U+1F4B0, U+1F4B3, U+1F4B9, U+1F4BB, U+1F4BF, U+1F4C8-1F4CB, U+1F4D6, U+1F4DA, U+1F4DF, U+1F4E3-1F4E6, U+1F4EA-1F4ED, U+1F4F7, U+1F4F9-1F4FB, U+1F4FD-1F4FE, U+1F503, U+1F507-1F50B, U+1F50D, U+1F512-1F513, U+1F53E-1F54A, U+1F54F-1F5FA, U+1F610, U+1F650-1F67F, U+1F687, U+1F68D, U+1F691, U+1F694, U+1F698, U+1F6AD, U+1F6B2, U+1F6B9-1F6BA, U+1F6BC, U+1F6C6-1F6CF, U+1F6D3-1F6D7, U+1F6E0-1F6EA, U+1F6F0-1F6F3, U+1F6F7-1F6FC, U+1F700-1F7FF, U+1F800-1F80B, U+1F810-1F847, U+1F850-1F859, U+1F860-1F887, U+1F890-1F8AD, U+1F8B0-1F8BB, U+1F8C0-1F8C1, U+1F900-1F90B, U+1F93B, U+1F946, U+1F984, U+1F996, U+1F9E9, U+1FA00-1FA6F, U+1FA70-1FA7C, U+1FA80-1FA89, U+1FA8F-1FAC6, U+1FACE-1FADC, U+1FADF-1FAE9, U+1FAF0-1FAF8, U+1FB00-1FBFF; } /* vietnamese */ @@ -551,7 +551,7 @@ font-weight: 300; font-stretch: 100%; font-display: fallback; - src: url(../fonts.gstatic.com/s/roboto/v47/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3OUBGEe.woff2) format('woff2'); + src: url(../fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3OUBGEe.woff2) format('woff2'); unicode-range: U+0102-0103, U+0110-0111, U+0128-0129, U+0168-0169, U+01A0-01A1, U+01AF-01B0, U+0300-0301, U+0303-0304, U+0308-0309, U+0323, U+0329, U+1EA0-1EF9, U+20AB; } /* latin-ext */ @@ -561,7 +561,7 @@ font-weight: 300; font-stretch: 100%; font-display: fallback; - src: url(../fonts.gstatic.com/s/roboto/v47/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3KUBGEe.woff2) format('woff2'); + src: url(../fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3KUBGEe.woff2) format('woff2'); unicode-range: U+0100-02BA, U+02BD-02C5, U+02C7-02CC, U+02CE-02D7, U+02DD-02FF, U+0304, U+0308, U+0329, U+1D00-1DBF, U+1E00-1E9F, U+1EF2-1EFF, U+2020, U+20A0-20AB, U+20AD-20C0, U+2113, U+2C60-2C7F, U+A720-A7FF; } /* latin */ @@ -571,7 +571,7 @@ font-weight: 300; font-stretch: 100%; font-display: fallback; - src: url(../fonts.gstatic.com/s/roboto/v47/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBA.woff2) format('woff2'); + src: url(../fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBA.woff2) format('woff2'); unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD; } /* cyrillic-ext */ @@ -581,7 +581,7 @@ font-weight: 400; font-stretch: 100%; font-display: fallback; - src: url(../fonts.gstatic.com/s/roboto/v47/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3GUBGEe.woff2) format('woff2'); + src: url(../fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3GUBGEe.woff2) format('woff2'); unicode-range: U+0460-052F, U+1C80-1C8A, U+20B4, U+2DE0-2DFF, U+A640-A69F, U+FE2E-FE2F; } /* cyrillic */ @@ -591,7 +591,7 @@ font-weight: 400; font-stretch: 100%; font-display: fallback; - src: url(../fonts.gstatic.com/s/roboto/v47/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3iUBGEe.woff2) format('woff2'); + src: url(../fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3iUBGEe.woff2) format('woff2'); unicode-range: U+0301, U+0400-045F, U+0490-0491, U+04B0-04B1, U+2116; } /* greek-ext */ @@ -601,7 +601,7 @@ font-weight: 400; font-stretch: 100%; font-display: fallback; - src: url(../fonts.gstatic.com/s/roboto/v47/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3CUBGEe.woff2) format('woff2'); + src: url(../fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3CUBGEe.woff2) format('woff2'); unicode-range: U+1F00-1FFF; } /* greek */ @@ -611,7 +611,7 @@ font-weight: 400; font-stretch: 100%; font-display: fallback; - src: url(../fonts.gstatic.com/s/roboto/v47/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3-UBGEe.woff2) format('woff2'); + src: url(../fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3-UBGEe.woff2) format('woff2'); unicode-range: U+0370-0377, U+037A-037F, U+0384-038A, U+038C, U+038E-03A1, U+03A3-03FF; } /* math */ @@ -621,7 +621,7 @@ font-weight: 400; font-stretch: 100%; font-display: fallback; - src: url(../fonts.gstatic.com/s/roboto/v47/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMawCUBGEe.woff2) format('woff2'); + src: url(../fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMawCUBGEe.woff2) format('woff2'); unicode-range: U+0302-0303, U+0305, U+0307-0308, U+0310, U+0312, U+0315, U+031A, U+0326-0327, U+032C, U+032F-0330, U+0332-0333, U+0338, U+033A, U+0346, U+034D, U+0391-03A1, U+03A3-03A9, U+03B1-03C9, U+03D1, U+03D5-03D6, U+03F0-03F1, U+03F4-03F5, U+2016-2017, U+2034-2038, U+203C, U+2040, U+2043, U+2047, U+2050, U+2057, U+205F, U+2070-2071, U+2074-208E, U+2090-209C, U+20D0-20DC, U+20E1, U+20E5-20EF, U+2100-2112, U+2114-2115, U+2117-2121, U+2123-214F, U+2190, U+2192, U+2194-21AE, U+21B0-21E5, U+21F1-21F2, U+21F4-2211, U+2213-2214, U+2216-22FF, U+2308-230B, U+2310, U+2319, U+231C-2321, U+2336-237A, U+237C, U+2395, U+239B-23B7, U+23D0, U+23DC-23E1, U+2474-2475, U+25AF, U+25B3, U+25B7, U+25BD, U+25C1, U+25CA, U+25CC, U+25FB, U+266D-266F, U+27C0-27FF, U+2900-2AFF, U+2B0E-2B11, U+2B30-2B4C, U+2BFE, U+3030, U+FF5B, U+FF5D, U+1D400-1D7FF, U+1EE00-1EEFF; } /* symbols */ @@ -631,7 +631,7 @@ font-weight: 400; font-stretch: 100%; font-display: fallback; - src: url(../fonts.gstatic.com/s/roboto/v47/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMaxKUBGEe.woff2) format('woff2'); + src: url(../fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMaxKUBGEe.woff2) format('woff2'); unicode-range: U+0001-000C, U+000E-001F, U+007F-009F, U+20DD-20E0, U+20E2-20E4, U+2150-218F, U+2190, U+2192, U+2194-2199, U+21AF, U+21E6-21F0, U+21F3, U+2218-2219, U+2299, U+22C4-22C6, U+2300-243F, U+2440-244A, U+2460-24FF, U+25A0-27BF, U+2800-28FF, U+2921-2922, U+2981, U+29BF, U+29EB, U+2B00-2BFF, U+4DC0-4DFF, U+FFF9-FFFB, U+10140-1018E, U+10190-1019C, U+101A0, U+101D0-101FD, U+102E0-102FB, U+10E60-10E7E, U+1D2C0-1D2D3, U+1D2E0-1D37F, U+1F000-1F0FF, U+1F100-1F1AD, U+1F1E6-1F1FF, U+1F30D-1F30F, U+1F315, U+1F31C, U+1F31E, U+1F320-1F32C, U+1F336, U+1F378, U+1F37D, U+1F382, U+1F393-1F39F, U+1F3A7-1F3A8, U+1F3AC-1F3AF, U+1F3C2, U+1F3C4-1F3C6, U+1F3CA-1F3CE, U+1F3D4-1F3E0, U+1F3ED, U+1F3F1-1F3F3, U+1F3F5-1F3F7, U+1F408, U+1F415, U+1F41F, U+1F426, U+1F43F, U+1F441-1F442, U+1F444, U+1F446-1F449, U+1F44C-1F44E, U+1F453, U+1F46A, U+1F47D, U+1F4A3, U+1F4B0, U+1F4B3, U+1F4B9, U+1F4BB, U+1F4BF, U+1F4C8-1F4CB, U+1F4D6, U+1F4DA, U+1F4DF, U+1F4E3-1F4E6, U+1F4EA-1F4ED, U+1F4F7, U+1F4F9-1F4FB, U+1F4FD-1F4FE, U+1F503, U+1F507-1F50B, U+1F50D, U+1F512-1F513, U+1F53E-1F54A, U+1F54F-1F5FA, U+1F610, U+1F650-1F67F, U+1F687, U+1F68D, U+1F691, U+1F694, U+1F698, U+1F6AD, U+1F6B2, U+1F6B9-1F6BA, U+1F6BC, U+1F6C6-1F6CF, U+1F6D3-1F6D7, U+1F6E0-1F6EA, U+1F6F0-1F6F3, U+1F6F7-1F6FC, U+1F700-1F7FF, U+1F800-1F80B, U+1F810-1F847, U+1F850-1F859, U+1F860-1F887, U+1F890-1F8AD, U+1F8B0-1F8BB, U+1F8C0-1F8C1, U+1F900-1F90B, U+1F93B, U+1F946, U+1F984, U+1F996, U+1F9E9, U+1FA00-1FA6F, U+1FA70-1FA7C, U+1FA80-1FA89, U+1FA8F-1FAC6, U+1FACE-1FADC, U+1FADF-1FAE9, U+1FAF0-1FAF8, U+1FB00-1FBFF; } /* vietnamese */ @@ -641,7 +641,7 @@ font-weight: 400; font-stretch: 100%; font-display: fallback; - src: url(../fonts.gstatic.com/s/roboto/v47/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3OUBGEe.woff2) format('woff2'); + src: url(../fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3OUBGEe.woff2) format('woff2'); unicode-range: U+0102-0103, U+0110-0111, U+0128-0129, U+0168-0169, U+01A0-01A1, U+01AF-01B0, U+0300-0301, U+0303-0304, U+0308-0309, U+0323, U+0329, U+1EA0-1EF9, U+20AB; } /* latin-ext */ @@ -651,7 +651,7 @@ font-weight: 400; font-stretch: 100%; font-display: fallback; - src: url(../fonts.gstatic.com/s/roboto/v47/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3KUBGEe.woff2) format('woff2'); + src: url(../fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3KUBGEe.woff2) format('woff2'); unicode-range: U+0100-02BA, U+02BD-02C5, U+02C7-02CC, U+02CE-02D7, U+02DD-02FF, U+0304, U+0308, U+0329, U+1D00-1DBF, U+1E00-1E9F, U+1EF2-1EFF, U+2020, U+20A0-20AB, U+20AD-20C0, U+2113, U+2C60-2C7F, U+A720-A7FF; } /* latin */ @@ -661,7 +661,7 @@ font-weight: 400; font-stretch: 100%; font-display: fallback; - src: url(../fonts.gstatic.com/s/roboto/v47/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBA.woff2) format('woff2'); + src: url(../fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBA.woff2) format('woff2'); unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD; } /* cyrillic-ext */ @@ -671,7 +671,7 @@ font-weight: 700; font-stretch: 100%; font-display: fallback; - src: url(../fonts.gstatic.com/s/roboto/v47/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3GUBGEe.woff2) format('woff2'); + src: url(../fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3GUBGEe.woff2) format('woff2'); unicode-range: U+0460-052F, U+1C80-1C8A, U+20B4, U+2DE0-2DFF, U+A640-A69F, U+FE2E-FE2F; } /* cyrillic */ @@ -681,7 +681,7 @@ font-weight: 700; font-stretch: 100%; font-display: fallback; - src: url(../fonts.gstatic.com/s/roboto/v47/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3iUBGEe.woff2) format('woff2'); + src: url(../fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3iUBGEe.woff2) format('woff2'); unicode-range: U+0301, U+0400-045F, U+0490-0491, U+04B0-04B1, U+2116; } /* greek-ext */ @@ -691,7 +691,7 @@ font-weight: 700; font-stretch: 100%; font-display: fallback; - src: url(../fonts.gstatic.com/s/roboto/v47/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3CUBGEe.woff2) format('woff2'); + src: url(../fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3CUBGEe.woff2) format('woff2'); unicode-range: U+1F00-1FFF; } /* greek */ @@ -701,7 +701,7 @@ font-weight: 700; font-stretch: 100%; font-display: fallback; - src: url(../fonts.gstatic.com/s/roboto/v47/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3-UBGEe.woff2) format('woff2'); + src: url(../fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3-UBGEe.woff2) format('woff2'); unicode-range: U+0370-0377, U+037A-037F, U+0384-038A, U+038C, U+038E-03A1, U+03A3-03FF; } /* math */ @@ -711,7 +711,7 @@ font-weight: 700; font-stretch: 100%; font-display: fallback; - src: url(../fonts.gstatic.com/s/roboto/v47/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMawCUBGEe.woff2) format('woff2'); + src: url(../fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMawCUBGEe.woff2) format('woff2'); unicode-range: U+0302-0303, U+0305, U+0307-0308, U+0310, U+0312, U+0315, U+031A, U+0326-0327, U+032C, U+032F-0330, U+0332-0333, U+0338, U+033A, U+0346, U+034D, U+0391-03A1, U+03A3-03A9, U+03B1-03C9, U+03D1, U+03D5-03D6, U+03F0-03F1, U+03F4-03F5, U+2016-2017, U+2034-2038, U+203C, U+2040, U+2043, U+2047, U+2050, U+2057, U+205F, U+2070-2071, U+2074-208E, U+2090-209C, U+20D0-20DC, U+20E1, U+20E5-20EF, U+2100-2112, U+2114-2115, U+2117-2121, U+2123-214F, U+2190, U+2192, U+2194-21AE, U+21B0-21E5, U+21F1-21F2, U+21F4-2211, U+2213-2214, U+2216-22FF, U+2308-230B, U+2310, U+2319, U+231C-2321, U+2336-237A, U+237C, U+2395, U+239B-23B7, U+23D0, U+23DC-23E1, U+2474-2475, U+25AF, U+25B3, U+25B7, U+25BD, U+25C1, U+25CA, U+25CC, U+25FB, U+266D-266F, U+27C0-27FF, U+2900-2AFF, U+2B0E-2B11, U+2B30-2B4C, U+2BFE, U+3030, U+FF5B, U+FF5D, U+1D400-1D7FF, U+1EE00-1EEFF; } /* symbols */ @@ -721,7 +721,7 @@ font-weight: 700; font-stretch: 100%; font-display: fallback; - src: url(../fonts.gstatic.com/s/roboto/v47/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMaxKUBGEe.woff2) format('woff2'); + src: url(../fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMaxKUBGEe.woff2) format('woff2'); unicode-range: U+0001-000C, U+000E-001F, U+007F-009F, U+20DD-20E0, U+20E2-20E4, U+2150-218F, U+2190, U+2192, U+2194-2199, U+21AF, U+21E6-21F0, U+21F3, U+2218-2219, U+2299, U+22C4-22C6, U+2300-243F, U+2440-244A, U+2460-24FF, U+25A0-27BF, U+2800-28FF, U+2921-2922, U+2981, U+29BF, U+29EB, U+2B00-2BFF, U+4DC0-4DFF, U+FFF9-FFFB, U+10140-1018E, U+10190-1019C, U+101A0, U+101D0-101FD, U+102E0-102FB, U+10E60-10E7E, U+1D2C0-1D2D3, U+1D2E0-1D37F, U+1F000-1F0FF, U+1F100-1F1AD, U+1F1E6-1F1FF, U+1F30D-1F30F, U+1F315, U+1F31C, U+1F31E, U+1F320-1F32C, U+1F336, U+1F378, U+1F37D, U+1F382, U+1F393-1F39F, U+1F3A7-1F3A8, U+1F3AC-1F3AF, U+1F3C2, U+1F3C4-1F3C6, U+1F3CA-1F3CE, U+1F3D4-1F3E0, U+1F3ED, U+1F3F1-1F3F3, U+1F3F5-1F3F7, U+1F408, U+1F415, U+1F41F, U+1F426, U+1F43F, U+1F441-1F442, U+1F444, U+1F446-1F449, U+1F44C-1F44E, U+1F453, U+1F46A, U+1F47D, U+1F4A3, U+1F4B0, U+1F4B3, U+1F4B9, U+1F4BB, U+1F4BF, U+1F4C8-1F4CB, U+1F4D6, U+1F4DA, U+1F4DF, U+1F4E3-1F4E6, U+1F4EA-1F4ED, U+1F4F7, U+1F4F9-1F4FB, U+1F4FD-1F4FE, U+1F503, U+1F507-1F50B, U+1F50D, U+1F512-1F513, U+1F53E-1F54A, U+1F54F-1F5FA, U+1F610, U+1F650-1F67F, U+1F687, U+1F68D, U+1F691, U+1F694, U+1F698, U+1F6AD, U+1F6B2, U+1F6B9-1F6BA, U+1F6BC, U+1F6C6-1F6CF, U+1F6D3-1F6D7, U+1F6E0-1F6EA, U+1F6F0-1F6F3, U+1F6F7-1F6FC, U+1F700-1F7FF, U+1F800-1F80B, U+1F810-1F847, U+1F850-1F859, U+1F860-1F887, U+1F890-1F8AD, U+1F8B0-1F8BB, U+1F8C0-1F8C1, U+1F900-1F90B, U+1F93B, U+1F946, U+1F984, U+1F996, U+1F9E9, U+1FA00-1FA6F, U+1FA70-1FA7C, U+1FA80-1FA89, U+1FA8F-1FAC6, U+1FACE-1FADC, U+1FADF-1FAE9, U+1FAF0-1FAF8, U+1FB00-1FBFF; } /* vietnamese */ @@ -731,7 +731,7 @@ font-weight: 700; font-stretch: 100%; font-display: fallback; - src: url(../fonts.gstatic.com/s/roboto/v47/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3OUBGEe.woff2) format('woff2'); + src: url(../fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3OUBGEe.woff2) format('woff2'); unicode-range: U+0102-0103, U+0110-0111, U+0128-0129, U+0168-0169, U+01A0-01A1, U+01AF-01B0, U+0300-0301, U+0303-0304, U+0308-0309, U+0323, U+0329, U+1EA0-1EF9, U+20AB; } /* latin-ext */ @@ -741,7 +741,7 @@ font-weight: 700; font-stretch: 100%; font-display: fallback; - src: url(../fonts.gstatic.com/s/roboto/v47/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3KUBGEe.woff2) format('woff2'); + src: url(../fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3KUBGEe.woff2) format('woff2'); unicode-range: U+0100-02BA, U+02BD-02C5, U+02C7-02CC, U+02CE-02D7, U+02DD-02FF, U+0304, U+0308, U+0329, U+1D00-1DBF, U+1E00-1E9F, U+1EF2-1EFF, U+2020, U+20A0-20AB, U+20AD-20C0, U+2113, U+2C60-2C7F, U+A720-A7FF; } /* latin */ @@ -751,6 +751,6 @@ font-weight: 700; font-stretch: 100%; font-display: fallback; - src: url(../fonts.gstatic.com/s/roboto/v47/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBA.woff2) format('woff2'); + src: url(../fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBA.woff2) format('woff2'); unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD; } diff --git 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sans-serif',this.fontSize="16px",this.labelBackground="#181818",this.textColor="#ccc",this.THEME_COLOR_LIMIT=12,this.nodeBkg="calculated",this.nodeBorder="calculated",this.clusterBkg="calculated",this.clusterBorder="calculated",this.defaultLinkColor="calculated",this.titleColor="#F9FFFE",this.edgeLabelBackground="calculated",this.actorBorder="calculated",this.actorBkg="calculated",this.actorTextColor="calculated",this.actorLineColor="calculated",this.signalColor="calculated",this.signalTextColor="calculated",this.labelBoxBkgColor="calculated",this.labelBoxBorderColor="calculated",this.labelTextColor="calculated",this.loopTextColor="calculated",this.noteBorderColor="calculated",this.noteBkgColor="#fff5ad",this.noteTextColor="calculated",this.activationBorderColor="calculated",this.activationBkgColor="calculated",this.sequenceNumberColor="black",this.sectionBkgColor=Ot("#EAE8D9",30),this.altSectionBkgColor="calculated",this.sectionBkgColor2="#EAE8D9",this.excludeBkgColor=Ot(this.sectionBkgColor,10),this.taskBorderColor=qa(255,255,255,70),this.taskBkgColor="calculated",this.taskTextColor="calculated",this.taskTextLightColor="calculated",this.taskTextOutsideColor="calculated",this.taskTextClickableColor="#003163",this.activeTaskBorderColor=qa(255,255,255,50),this.activeTaskBkgColor="#81B1DB",this.gridColor="calculated",this.doneTaskBkgColor="calculated",this.doneTaskBorderColor="grey",this.critBorderColor="#E83737",this.critBkgColor="#E83737",this.taskTextDarkColor="calculated",this.todayLineColor="#DB5757",this.personBorder=this.primaryBorderColor,this.personBkg=this.mainBkg,this.archEdgeColor="calculated",this.archEdgeArrowColor="calculated",this.archEdgeWidth="3",this.archGroupBorderColor=this.primaryBorderColor,this.archGroupBorderWidth="2px",this.rowOdd=this.rowOdd||Dt(this.mainBkg,5)||"#ffffff",this.rowEven=this.rowEven||Ot(this.mainBkg,10),this.labelColor="calculated",this.errorBkgColor="#a44141",this.errorTextColor="#ddd"}updateColors(){this.secondBkg=Dt(this.mainBkg,16),this.lineColor=this.mainContrastColor,this.arrowheadColor=this.mainContrastColor,this.nodeBkg=this.mainBkg,this.nodeBorder=this.border1,this.clusterBkg=this.secondBkg,this.clusterBorder=this.border2,this.defaultLinkColor=this.lineColor,this.edgeLabelBackground=Dt(this.labelBackground,25),this.actorBorder=this.border1,this.actorBkg=this.mainBkg,this.actorTextColor=this.mainContrastColor,this.actorLineColor=this.actorBorder,this.signalColor=this.mainContrastColor,this.signalTextColor=this.mainContrastColor,this.labelBoxBkgColor=this.actorBkg,this.labelBoxBorderColor=this.actorBorder,this.labelTextColor=this.mainContrastColor,this.loopTextColor=this.mainContrastColor,this.noteBorderColor=this.secondaryBorderColor,this.noteBkgColor=this.secondBkg,this.noteTextColor=this.secondaryTextColor,this.activationBorderColor=this.border1,this.activationBkgColor=this.secondBkg,this.altSectionBkgColor=this.background,this.taskBkgColor=Dt(this.mainBkg,23),this.taskTextColor=this.darkTextColor,this.taskTextLightColor=this.mainContrastColor,this.taskTextOutsideColor=this.taskTextLightColor,this.gridColor=this.mainContrastColor,this.doneTaskBkgColor=this.mainContrastColor,this.taskTextDarkColor=this.darkTextColor,this.archEdgeColor=this.lineColor,this.archEdgeArrowColor=this.lineColor,this.transitionColor=this.transitionColor||this.lineColor,this.transitionLabelColor=this.transitionLabelColor||this.textColor,this.stateLabelColor=this.stateLabelColor||this.stateBkg||this.primaryTextColor,this.stateBkg=this.stateBkg||this.mainBkg,this.labelBackgroundColor=this.labelBackgroundColor||this.stateBkg,this.compositeBackground=this.compositeBackground||this.background||this.tertiaryColor,this.altBackground=this.altBackground||"#555",this.compositeTitleBackground=this.compositeTitleBackground||this.mainBkg,this.compositeBorder=this.compositeBorder||this.nodeBorder,this.innerEndBackground=this.primaryBorderColor,this.specialStateColor="#f4f4f4",this.errorBkgColor=this.errorBkgColor||this.tertiaryColor,this.errorTextColor=this.errorTextColor||this.tertiaryTextColor,this.fillType0=this.primaryColor,this.fillType1=this.secondaryColor,this.fillType2=Me(this.primaryColor,{h:64}),this.fillType3=Me(this.secondaryColor,{h:64}),this.fillType4=Me(this.primaryColor,{h:-64}),this.fillType5=Me(this.secondaryColor,{h:-64}),this.fillType6=Me(this.primaryColor,{h:128}),this.fillType7=Me(this.secondaryColor,{h:128}),this.cScale1=this.cScale1||"#0b0000",this.cScale2=this.cScale2||"#4d1037",this.cScale3=this.cScale3||"#3f5258",this.cScale4=this.cScale4||"#4f2f1b",this.cScale5=this.cScale5||"#6e0a0a",this.cScale6=this.cScale6||"#3b0048",this.cScale7=this.cScale7||"#995a01",this.cScale8=this.cScale8||"#154706",this.cScale9=this.cScale9||"#161722",this.cScale10=this.cScale10||"#00296f",this.cScale11=this.cScale11||"#01629c",this.cScale12=this.cScale12||"#010029",this.cScale0=this.cScale0||this.primaryColor,this.cScale1=this.cScale1||this.secondaryColor,this.cScale2=this.cScale2||this.tertiaryColor,this.cScale3=this.cScale3||Me(this.primaryColor,{h:30}),this.cScale4=this.cScale4||Me(this.primaryColor,{h:60}),this.cScale5=this.cScale5||Me(this.primaryColor,{h:90}),this.cScale6=this.cScale6||Me(this.primaryColor,{h:120}),this.cScale7=this.cScale7||Me(this.primaryColor,{h:150}),this.cScale8=this.cScale8||Me(this.primaryColor,{h:210}),this.cScale9=this.cScale9||Me(this.primaryColor,{h:270}),this.cScale10=this.cScale10||Me(this.primaryColor,{h:300}),this.cScale11=this.cScale11||Me(this.primaryColor,{h:330});for(let e=0;e{this[n]=e[n]}),this.updateColors(),r.forEach(n=>{this[n]=e[n]})}},L$=o(t=>{let e=new KC;return e.calculate(t),e},"getThemeVariables")});var QC,oh,_y=N(()=>{"use strict";Ys();o0();Ay();QC=class{static{o(this,"Theme")}constructor(){this.background="#f4f4f4",this.primaryColor="#ECECFF",this.secondaryColor=Me(this.primaryColor,{h:120}),this.secondaryColor="#ffffde",this.tertiaryColor=Me(this.primaryColor,{h:-160}),this.primaryBorderColor=Ti(this.primaryColor,this.darkMode),this.secondaryBorderColor=Ti(this.secondaryColor,this.darkMode),this.tertiaryBorderColor=Ti(this.tertiaryColor,this.darkMode),this.primaryTextColor=wt(this.primaryColor),this.secondaryTextColor=wt(this.secondaryColor),this.tertiaryTextColor=wt(this.tertiaryColor),this.lineColor=wt(this.background),this.textColor=wt(this.background),this.background="white",this.mainBkg="#ECECFF",this.secondBkg="#ffffde",this.lineColor="#333333",this.border1="#9370DB",this.border2="#aaaa33",this.arrowheadColor="#333333",this.fontFamily='"trebuchet ms", verdana, arial, sans-serif',this.fontSize="16px",this.labelBackground="rgba(232,232,232, 0.8)",this.textColor="#333",this.THEME_COLOR_LIMIT=12,this.nodeBkg="calculated",this.nodeBorder="calculated",this.clusterBkg="calculated",this.clusterBorder="calculated",this.defaultLinkColor="calculated",this.titleColor="calculated",this.edgeLabelBackground="calculated",this.actorBorder="calculated",this.actorBkg="calculated",this.actorTextColor="black",this.actorLineColor="calculated",this.signalColor="calculated",this.signalTextColor="calculated",this.labelBoxBkgColor="calculated",this.labelBoxBorderColor="calculated",this.labelTextColor="calculated",this.loopTextColor="calculated",this.noteBorderColor="calculated",this.noteBkgColor="#fff5ad",this.noteTextColor="calculated",this.activationBorderColor="#666",this.activationBkgColor="#f4f4f4",this.sequenceNumberColor="white",this.sectionBkgColor="calculated",this.altSectionBkgColor="calculated",this.sectionBkgColor2="calculated",this.excludeBkgColor="#eeeeee",this.taskBorderColor="calculated",this.taskBkgColor="calculated",this.taskTextLightColor="calculated",this.taskTextColor=this.taskTextLightColor,this.taskTextDarkColor="calculated",this.taskTextOutsideColor=this.taskTextDarkColor,this.taskTextClickableColor="calculated",this.activeTaskBorderColor="calculated",this.activeTaskBkgColor="calculated",this.gridColor="calculated",this.doneTaskBkgColor="calculated",this.doneTaskBorderColor="calculated",this.critBorderColor="calculated",this.critBkgColor="calculated",this.todayLineColor="calculated",this.sectionBkgColor=qa(102,102,255,.49),this.altSectionBkgColor="white",this.sectionBkgColor2="#fff400",this.taskBorderColor="#534fbc",this.taskBkgColor="#8a90dd",this.taskTextLightColor="white",this.taskTextColor="calculated",this.taskTextDarkColor="black",this.taskTextOutsideColor="calculated",this.taskTextClickableColor="#003163",this.activeTaskBorderColor="#534fbc",this.activeTaskBkgColor="#bfc7ff",this.gridColor="lightgrey",this.doneTaskBkgColor="lightgrey",this.doneTaskBorderColor="grey",this.critBorderColor="#ff8888",this.critBkgColor="red",this.todayLineColor="red",this.personBorder=this.primaryBorderColor,this.personBkg=this.mainBkg,this.archEdgeColor="calculated",this.archEdgeArrowColor="calculated",this.archEdgeWidth="3",this.archGroupBorderColor=this.primaryBorderColor,this.archGroupBorderWidth="2px",this.rowOdd="calculated",this.rowEven="calculated",this.labelColor="black",this.errorBkgColor="#552222",this.errorTextColor="#552222",this.updateColors()}updateColors(){this.cScale0=this.cScale0||this.primaryColor,this.cScale1=this.cScale1||this.secondaryColor,this.cScale2=this.cScale2||this.tertiaryColor,this.cScale3=this.cScale3||Me(this.primaryColor,{h:30}),this.cScale4=this.cScale4||Me(this.primaryColor,{h:60}),this.cScale5=this.cScale5||Me(this.primaryColor,{h:90}),this.cScale6=this.cScale6||Me(this.primaryColor,{h:120}),this.cScale7=this.cScale7||Me(this.primaryColor,{h:150}),this.cScale8=this.cScale8||Me(this.primaryColor,{h:210}),this.cScale9=this.cScale9||Me(this.primaryColor,{h:270}),this.cScale10=this.cScale10||Me(this.primaryColor,{h:300}),this.cScale11=this.cScale11||Me(this.primaryColor,{h:330}),this.cScalePeer1=this.cScalePeer1||Ot(this.secondaryColor,45),this.cScalePeer2=this.cScalePeer2||Ot(this.tertiaryColor,40);for(let e=0;e{this[n]==="calculated"&&(this[n]=void 0)}),typeof e!="object"){this.updateColors();return}let r=Object.keys(e);r.forEach(n=>{this[n]=e[n]}),this.updateColors(),r.forEach(n=>{this[n]=e[n]})}},oh=o(t=>{let e=new QC;return e.calculate(t),e},"getThemeVariables")});var ZC,N$,M$=N(()=>{"use strict";Ys();Ay();o0();ZC=class{static{o(this,"Theme")}constructor(){this.background="#f4f4f4",this.primaryColor="#cde498",this.secondaryColor="#cdffb2",this.background="white",this.mainBkg="#cde498",this.secondBkg="#cdffb2",this.lineColor="green",this.border1="#13540c",this.border2="#6eaa49",this.arrowheadColor="green",this.fontFamily='"trebuchet ms", verdana, arial, sans-serif',this.fontSize="16px",this.tertiaryColor=Dt("#cde498",10),this.primaryBorderColor=Ti(this.primaryColor,this.darkMode),this.secondaryBorderColor=Ti(this.secondaryColor,this.darkMode),this.tertiaryBorderColor=Ti(this.tertiaryColor,this.darkMode),this.primaryTextColor=wt(this.primaryColor),this.secondaryTextColor=wt(this.secondaryColor),this.tertiaryTextColor=wt(this.primaryColor),this.lineColor=wt(this.background),this.textColor=wt(this.background),this.THEME_COLOR_LIMIT=12,this.nodeBkg="calculated",this.nodeBorder="calculated",this.clusterBkg="calculated",this.clusterBorder="calculated",this.defaultLinkColor="calculated",this.titleColor="#333",this.edgeLabelBackground="#e8e8e8",this.actorBorder="calculated",this.actorBkg="calculated",this.actorTextColor="black",this.actorLineColor="calculated",this.signalColor="#333",this.signalTextColor="#333",this.labelBoxBkgColor="calculated",this.labelBoxBorderColor="#326932",this.labelTextColor="calculated",this.loopTextColor="calculated",this.noteBorderColor="calculated",this.noteBkgColor="#fff5ad",this.noteTextColor="calculated",this.activationBorderColor="#666",this.activationBkgColor="#f4f4f4",this.sequenceNumberColor="white",this.sectionBkgColor="#6eaa49",this.altSectionBkgColor="white",this.sectionBkgColor2="#6eaa49",this.excludeBkgColor="#eeeeee",this.taskBorderColor="calculated",this.taskBkgColor="#487e3a",this.taskTextLightColor="white",this.taskTextColor="calculated",this.taskTextDarkColor="black",this.taskTextOutsideColor="calculated",this.taskTextClickableColor="#003163",this.activeTaskBorderColor="calculated",this.activeTaskBkgColor="calculated",this.gridColor="lightgrey",this.doneTaskBkgColor="lightgrey",this.doneTaskBorderColor="grey",this.critBorderColor="#ff8888",this.critBkgColor="red",this.todayLineColor="red",this.personBorder=this.primaryBorderColor,this.personBkg=this.mainBkg,this.archEdgeColor="calculated",this.archEdgeArrowColor="calculated",this.archEdgeWidth="3",this.archGroupBorderColor=this.primaryBorderColor,this.archGroupBorderWidth="2px",this.labelColor="black",this.errorBkgColor="#552222",this.errorTextColor="#552222"}updateColors(){this.actorBorder=Ot(this.mainBkg,20),this.actorBkg=this.mainBkg,this.labelBoxBkgColor=this.actorBkg,this.labelTextColor=this.actorTextColor,this.loopTextColor=this.actorTextColor,this.noteBorderColor=this.border2,this.noteTextColor=this.actorTextColor,this.actorLineColor=this.actorBorder,this.cScale0=this.cScale0||this.primaryColor,this.cScale1=this.cScale1||this.secondaryColor,this.cScale2=this.cScale2||this.tertiaryColor,this.cScale3=this.cScale3||Me(this.primaryColor,{h:30}),this.cScale4=this.cScale4||Me(this.primaryColor,{h:60}),this.cScale5=this.cScale5||Me(this.primaryColor,{h:90}),this.cScale6=this.cScale6||Me(this.primaryColor,{h:120}),this.cScale7=this.cScale7||Me(this.primaryColor,{h:150}),this.cScale8=this.cScale8||Me(this.primaryColor,{h:210}),this.cScale9=this.cScale9||Me(this.primaryColor,{h:270}),this.cScale10=this.cScale10||Me(this.primaryColor,{h:300}),this.cScale11=this.cScale11||Me(this.primaryColor,{h:330}),this.cScalePeer1=this.cScalePeer1||Ot(this.secondaryColor,45),this.cScalePeer2=this.cScalePeer2||Ot(this.tertiaryColor,40);for(let e=0;e{this[n]=e[n]}),this.updateColors(),r.forEach(n=>{this[n]=e[n]})}},N$=o(t=>{let e=new ZC;return e.calculate(t),e},"getThemeVariables")});var JC,I$,O$=N(()=>{"use strict";Ys();o0();Ay();JC=class{static{o(this,"Theme")}constructor(){this.primaryColor="#eee",this.contrast="#707070",this.secondaryColor=Dt(this.contrast,55),this.background="#ffffff",this.tertiaryColor=Me(this.primaryColor,{h:-160}),this.primaryBorderColor=Ti(this.primaryColor,this.darkMode),this.secondaryBorderColor=Ti(this.secondaryColor,this.darkMode),this.tertiaryBorderColor=Ti(this.tertiaryColor,this.darkMode),this.primaryTextColor=wt(this.primaryColor),this.secondaryTextColor=wt(this.secondaryColor),this.tertiaryTextColor=wt(this.tertiaryColor),this.lineColor=wt(this.background),this.textColor=wt(this.background),this.mainBkg="#eee",this.secondBkg="calculated",this.lineColor="#666",this.border1="#999",this.border2="calculated",this.note="#ffa",this.text="#333",this.critical="#d42",this.done="#bbb",this.arrowheadColor="#333333",this.fontFamily='"trebuchet ms", verdana, arial, sans-serif',this.fontSize="16px",this.THEME_COLOR_LIMIT=12,this.nodeBkg="calculated",this.nodeBorder="calculated",this.clusterBkg="calculated",this.clusterBorder="calculated",this.defaultLinkColor="calculated",this.titleColor="calculated",this.edgeLabelBackground="white",this.actorBorder="calculated",this.actorBkg="calculated",this.actorTextColor="calculated",this.actorLineColor=this.actorBorder,this.signalColor="calculated",this.signalTextColor="calculated",this.labelBoxBkgColor="calculated",this.labelBoxBorderColor="calculated",this.labelTextColor="calculated",this.loopTextColor="calculated",this.noteBorderColor="calculated",this.noteBkgColor="calculated",this.noteTextColor="calculated",this.activationBorderColor="#666",this.activationBkgColor="#f4f4f4",this.sequenceNumberColor="white",this.sectionBkgColor="calculated",this.altSectionBkgColor="white",this.sectionBkgColor2="calculated",this.excludeBkgColor="#eeeeee",this.taskBorderColor="calculated",this.taskBkgColor="calculated",this.taskTextLightColor="white",this.taskTextColor="calculated",this.taskTextDarkColor="calculated",this.taskTextOutsideColor="calculated",this.taskTextClickableColor="#003163",this.activeTaskBorderColor="calculated",this.activeTaskBkgColor="calculated",this.gridColor="calculated",this.doneTaskBkgColor="calculated",this.doneTaskBorderColor="calculated",this.critBkgColor="calculated",this.critBorderColor="calculated",this.todayLineColor="calculated",this.personBorder=this.primaryBorderColor,this.personBkg=this.mainBkg,this.archEdgeColor="calculated",this.archEdgeArrowColor="calculated",this.archEdgeWidth="3",this.archGroupBorderColor=this.primaryBorderColor,this.archGroupBorderWidth="2px",this.rowOdd=this.rowOdd||Dt(this.mainBkg,75)||"#ffffff",this.rowEven=this.rowEven||"#f4f4f4",this.labelColor="black",this.errorBkgColor="#552222",this.errorTextColor="#552222"}updateColors(){this.secondBkg=Dt(this.contrast,55),this.border2=this.contrast,this.actorBorder=Dt(this.border1,23),this.actorBkg=this.mainBkg,this.actorTextColor=this.text,this.actorLineColor=this.actorBorder,this.signalColor=this.text,this.signalTextColor=this.text,this.labelBoxBkgColor=this.actorBkg,this.labelBoxBorderColor=this.actorBorder,this.labelTextColor=this.text,this.loopTextColor=this.text,this.noteBorderColor="#999",this.noteBkgColor="#666",this.noteTextColor="#fff",this.cScale0=this.cScale0||"#555",this.cScale1=this.cScale1||"#F4F4F4",this.cScale2=this.cScale2||"#555",this.cScale3=this.cScale3||"#BBB",this.cScale4=this.cScale4||"#777",this.cScale5=this.cScale5||"#999",this.cScale6=this.cScale6||"#DDD",this.cScale7=this.cScale7||"#FFF",this.cScale8=this.cScale8||"#DDD",this.cScale9=this.cScale9||"#BBB",this.cScale10=this.cScale10||"#999",this.cScale11=this.cScale11||"#777";for(let e=0;e{this[n]=e[n]}),this.updateColors(),r.forEach(n=>{this[n]=e[n]})}},I$=o(t=>{let e=new JC;return e.calculate(t),e},"getThemeVariables")});var To,q4=N(()=>{"use strict";D$();R$();_y();M$();O$();To={base:{getThemeVariables:_$},dark:{getThemeVariables:L$},default:{getThemeVariables:oh},forest:{getThemeVariables:N$},neutral:{getThemeVariables:I$}}});var ql,P$=N(()=>{"use strict";ql={flowchart:{useMaxWidth:!0,titleTopMargin:25,subGraphTitleMargin:{top:0,bottom:0},diagramPadding:8,htmlLabels:!0,nodeSpacing:50,rankSpacing:50,curve:"basis",padding:15,defaultRenderer:"dagre-wrapper",wrappingWidth:200},sequence:{useMaxWidth:!0,hideUnusedParticipants:!1,activationWidth:10,diagramMarginX:50,diagramMarginY:10,actorMargin:50,width:150,height:65,boxMargin:10,boxTextMargin:5,noteMargin:10,messageMargin:35,messageAlign:"center",mirrorActors:!0,forceMenus:!1,bottomMarginAdj:1,rightAngles:!1,showSequenceNumbers:!1,actorFontSize:14,actorFontFamily:'"Open Sans", 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q=this.match.split(/(?:\r\n?|\n)/g);this.match=this.match.substr(0,this.match.length-1),this.matched=this.matched.substr(0,this.matched.length-1),xe.length-1&&(this.yylineno-=xe.length-1);var de=this.yylloc.range;return this.yylloc={first_line:this.yylloc.first_line,last_line:this.yylineno+1,first_column:this.yylloc.first_column,last_column:xe?(xe.length===q.length?this.yylloc.first_column:0)+q[q.length-xe.length].length-xe[0].length:this.yylloc.first_column-Ie},this.options.ranges&&(this.yylloc.range=[de[0],de[0]+this.yyleng-Ie]),this.yyleng=this.yytext.length,this},"unput"),more:o(function(){return this._more=!0,this},"more"),reject:o(function(){if(this.options.backtrack_lexer)this._backtrack=!0;else return this.parseError("Lexical error on line "+(this.yylineno+1)+`. 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sans-serif',this.fontSize="16px",this.labelBackground="#181818",this.textColor="#ccc",this.THEME_COLOR_LIMIT=12,this.nodeBkg="calculated",this.nodeBorder="calculated",this.clusterBkg="calculated",this.clusterBorder="calculated",this.defaultLinkColor="calculated",this.titleColor="#F9FFFE",this.edgeLabelBackground="calculated",this.actorBorder="calculated",this.actorBkg="calculated",this.actorTextColor="calculated",this.actorLineColor="calculated",this.signalColor="calculated",this.signalTextColor="calculated",this.labelBoxBkgColor="calculated",this.labelBoxBorderColor="calculated",this.labelTextColor="calculated",this.loopTextColor="calculated",this.noteBorderColor="calculated",this.noteBkgColor="#fff5ad",this.noteTextColor="calculated",this.activationBorderColor="calculated",this.activationBkgColor="calculated",this.sequenceNumberColor="black",this.sectionBkgColor=Ot("#EAE8D9",30),this.altSectionBkgColor="calculated",this.sectionBkgColor2="#EAE8D9",this.excludeBkgColor=Ot(this.sectionBkgColor,10),this.taskBorderColor=qa(255,255,255,70),this.taskBkgColor="calculated",this.taskTextColor="calculated",this.taskTextLightColor="calculated",this.taskTextOutsideColor="calculated",this.taskTextClickableColor="#003163",this.activeTaskBorderColor=qa(255,255,255,50),this.activeTaskBkgColor="#81B1DB",this.gridColor="calculated",this.doneTaskBkgColor="calculated",this.doneTaskBorderColor="grey",this.critBorderColor="#E83737",this.critBkgColor="#E83737",this.taskTextDarkColor="calculated",this.todayLineColor="#DB5757",this.vertLineColor="#00BFFF",this.personBorder=this.primaryBorderColor,this.personBkg=this.mainBkg,this.archEdgeColor="calculated",this.archEdgeArrowColor="calculated",this.archEdgeWidth="3",this.archGroupBorderColor=this.primaryBorderColor,this.archGroupBorderWidth="2px",this.rowOdd=this.rowOdd||Dt(this.mainBkg,5)||"#ffffff",this.rowEven=this.rowEven||Ot(this.mainBkg,10),this.labelColor="calculated",this.errorBkgColor="#a44141",this.errorTextColor="#ddd"}updateColors(){this.secondBkg=Dt(this.mainBkg,16),this.lineColor=this.mainContrastColor,this.arrowheadColor=this.mainContrastColor,this.nodeBkg=this.mainBkg,this.nodeBorder=this.border1,this.clusterBkg=this.secondBkg,this.clusterBorder=this.border2,this.defaultLinkColor=this.lineColor,this.edgeLabelBackground=Dt(this.labelBackground,25),this.actorBorder=this.border1,this.actorBkg=this.mainBkg,this.actorTextColor=this.mainContrastColor,this.actorLineColor=this.actorBorder,this.signalColor=this.mainContrastColor,this.signalTextColor=this.mainContrastColor,this.labelBoxBkgColor=this.actorBkg,this.labelBoxBorderColor=this.actorBorder,this.labelTextColor=this.mainContrastColor,this.loopTextColor=this.mainContrastColor,this.noteBorderColor=this.secondaryBorderColor,this.noteBkgColor=this.secondBkg,this.noteTextColor=this.secondaryTextColor,this.activationBorderColor=this.border1,this.activationBkgColor=this.secondBkg,this.altSectionBkgColor=this.background,this.taskBkgColor=Dt(this.mainBkg,23),this.taskTextColor=this.darkTextColor,this.taskTextLightColor=this.mainContrastColor,this.taskTextOutsideColor=this.taskTextLightColor,this.gridColor=this.mainContrastColor,this.doneTaskBkgColor=this.mainContrastColor,this.taskTextDarkColor=this.darkTextColor,this.archEdgeColor=this.lineColor,this.archEdgeArrowColor=this.lineColor,this.transitionColor=this.transitionColor||this.lineColor,this.transitionLabelColor=this.transitionLabelColor||this.textColor,this.stateLabelColor=this.stateLabelColor||this.stateBkg||this.primaryTextColor,this.stateBkg=this.stateBkg||this.mainBkg,this.labelBackgroundColor=this.labelBackgroundColor||this.stateBkg,this.compositeBackground=this.compositeBackground||this.background||this.tertiaryColor,this.altBackground=this.altBackground||"#555",this.compositeTitleBackground=this.compositeTitleBackground||this.mainBkg,this.compositeBorder=this.compositeBorder||this.nodeBorder,this.innerEndBackground=this.primaryBorderColor,this.specialStateColor="#f4f4f4",this.errorBkgColor=this.errorBkgColor||this.tertiaryColor,this.errorTextColor=this.errorTextColor||this.tertiaryTextColor,this.fillType0=this.primaryColor,this.fillType1=this.secondaryColor,this.fillType2=Me(this.primaryColor,{h:64}),this.fillType3=Me(this.secondaryColor,{h:64}),this.fillType4=Me(this.primaryColor,{h:-64}),this.fillType5=Me(this.secondaryColor,{h:-64}),this.fillType6=Me(this.primaryColor,{h:128}),this.fillType7=Me(this.secondaryColor,{h:128}),this.cScale1=this.cScale1||"#0b0000",this.cScale2=this.cScale2||"#4d1037",this.cScale3=this.cScale3||"#3f5258",this.cScale4=this.cScale4||"#4f2f1b",this.cScale5=this.cScale5||"#6e0a0a",this.cScale6=this.cScale6||"#3b0048",this.cScale7=this.cScale7||"#995a01",this.cScale8=this.cScale8||"#154706",this.cScale9=this.cScale9||"#161722",this.cScale10=this.cScale10||"#00296f",this.cScale11=this.cScale11||"#01629c",this.cScale12=this.cScale12||"#010029",this.cScale0=this.cScale0||this.primaryColor,this.cScale1=this.cScale1||this.secondaryColor,this.cScale2=this.cScale2||this.tertiaryColor,this.cScale3=this.cScale3||Me(this.primaryColor,{h:30}),this.cScale4=this.cScale4||Me(this.primaryColor,{h:60}),this.cScale5=this.cScale5||Me(this.primaryColor,{h:90}),this.cScale6=this.cScale6||Me(this.primaryColor,{h:120}),this.cScale7=this.cScale7||Me(this.primaryColor,{h:150}),this.cScale8=this.cScale8||Me(this.primaryColor,{h:210}),this.cScale9=this.cScale9||Me(this.primaryColor,{h:270}),this.cScale10=this.cScale10||Me(this.primaryColor,{h:300}),this.cScale11=this.cScale11||Me(this.primaryColor,{h:330});for(let e=0;e{this[n]=e[n]}),this.updateColors(),r.forEach(n=>{this[n]=e[n]})}},O$=o(t=>{let e=new r7;return e.calculate(t),e},"getThemeVariables")});var n7,hh,Py=N(()=>{"use strict";js();p0();Oy();n7=class{static{o(this,"Theme")}constructor(){this.background="#f4f4f4",this.primaryColor="#ECECFF",this.secondaryColor=Me(this.primaryColor,{h:120}),this.secondaryColor="#ffffde",this.tertiaryColor=Me(this.primaryColor,{h:-160}),this.primaryBorderColor=ki(this.primaryColor,this.darkMode),this.secondaryBorderColor=ki(this.secondaryColor,this.darkMode),this.tertiaryBorderColor=ki(this.tertiaryColor,this.darkMode),this.primaryTextColor=wt(this.primaryColor),this.secondaryTextColor=wt(this.secondaryColor),this.tertiaryTextColor=wt(this.tertiaryColor),this.lineColor=wt(this.background),this.textColor=wt(this.background),this.background="white",this.mainBkg="#ECECFF",this.secondBkg="#ffffde",this.lineColor="#333333",this.border1="#9370DB",this.border2="#aaaa33",this.arrowheadColor="#333333",this.fontFamily='"trebuchet ms", verdana, arial, sans-serif',this.fontSize="16px",this.labelBackground="rgba(232,232,232, 0.8)",this.textColor="#333",this.THEME_COLOR_LIMIT=12,this.nodeBkg="calculated",this.nodeBorder="calculated",this.clusterBkg="calculated",this.clusterBorder="calculated",this.defaultLinkColor="calculated",this.titleColor="calculated",this.edgeLabelBackground="calculated",this.actorBorder="calculated",this.actorBkg="calculated",this.actorTextColor="black",this.actorLineColor="calculated",this.signalColor="calculated",this.signalTextColor="calculated",this.labelBoxBkgColor="calculated",this.labelBoxBorderColor="calculated",this.labelTextColor="calculated",this.loopTextColor="calculated",this.noteBorderColor="calculated",this.noteBkgColor="#fff5ad",this.noteTextColor="calculated",this.activationBorderColor="#666",this.activationBkgColor="#f4f4f4",this.sequenceNumberColor="white",this.sectionBkgColor="calculated",this.altSectionBkgColor="calculated",this.sectionBkgColor2="calculated",this.excludeBkgColor="#eeeeee",this.taskBorderColor="calculated",this.taskBkgColor="calculated",this.taskTextLightColor="calculated",this.taskTextColor=this.taskTextLightColor,this.taskTextDarkColor="calculated",this.taskTextOutsideColor=this.taskTextDarkColor,this.taskTextClickableColor="calculated",this.activeTaskBorderColor="calculated",this.activeTaskBkgColor="calculated",this.gridColor="calculated",this.doneTaskBkgColor="calculated",this.doneTaskBorderColor="calculated",this.critBorderColor="calculated",this.critBkgColor="calculated",this.todayLineColor="calculated",this.vertLineColor="calculated",this.sectionBkgColor=qa(102,102,255,.49),this.altSectionBkgColor="white",this.sectionBkgColor2="#fff400",this.taskBorderColor="#534fbc",this.taskBkgColor="#8a90dd",this.taskTextLightColor="white",this.taskTextColor="calculated",this.taskTextDarkColor="black",this.taskTextOutsideColor="calculated",this.taskTextClickableColor="#003163",this.activeTaskBorderColor="#534fbc",this.activeTaskBkgColor="#bfc7ff",this.gridColor="lightgrey",this.doneTaskBkgColor="lightgrey",this.doneTaskBorderColor="grey",this.critBorderColor="#ff8888",this.critBkgColor="red",this.todayLineColor="red",this.vertLineColor="navy",this.personBorder=this.primaryBorderColor,this.personBkg=this.mainBkg,this.archEdgeColor="calculated",this.archEdgeArrowColor="calculated",this.archEdgeWidth="3",this.archGroupBorderColor=this.primaryBorderColor,this.archGroupBorderWidth="2px",this.rowOdd="calculated",this.rowEven="calculated",this.labelColor="black",this.errorBkgColor="#552222",this.errorTextColor="#552222",this.updateColors()}updateColors(){this.cScale0=this.cScale0||this.primaryColor,this.cScale1=this.cScale1||this.secondaryColor,this.cScale2=this.cScale2||this.tertiaryColor,this.cScale3=this.cScale3||Me(this.primaryColor,{h:30}),this.cScale4=this.cScale4||Me(this.primaryColor,{h:60}),this.cScale5=this.cScale5||Me(this.primaryColor,{h:90}),this.cScale6=this.cScale6||Me(this.primaryColor,{h:120}),this.cScale7=this.cScale7||Me(this.primaryColor,{h:150}),this.cScale8=this.cScale8||Me(this.primaryColor,{h:210}),this.cScale9=this.cScale9||Me(this.primaryColor,{h:270}),this.cScale10=this.cScale10||Me(this.primaryColor,{h:300}),this.cScale11=this.cScale11||Me(this.primaryColor,{h:330}),this.cScalePeer1=this.cScalePeer1||Ot(this.secondaryColor,45),this.cScalePeer2=this.cScalePeer2||Ot(this.tertiaryColor,40);for(let e=0;e{this[n]==="calculated"&&(this[n]=void 0)}),typeof e!="object"){this.updateColors();return}let r=Object.keys(e);r.forEach(n=>{this[n]=e[n]}),this.updateColors(),r.forEach(n=>{this[n]=e[n]})}},hh=o(t=>{let e=new n7;return e.calculate(t),e},"getThemeVariables")});var i7,B$,F$=N(()=>{"use strict";js();Oy();p0();i7=class{static{o(this,"Theme")}constructor(){this.background="#f4f4f4",this.primaryColor="#cde498",this.secondaryColor="#cdffb2",this.background="white",this.mainBkg="#cde498",this.secondBkg="#cdffb2",this.lineColor="green",this.border1="#13540c",this.border2="#6eaa49",this.arrowheadColor="green",this.fontFamily='"trebuchet ms", verdana, arial, sans-serif',this.fontSize="16px",this.tertiaryColor=Dt("#cde498",10),this.primaryBorderColor=ki(this.primaryColor,this.darkMode),this.secondaryBorderColor=ki(this.secondaryColor,this.darkMode),this.tertiaryBorderColor=ki(this.tertiaryColor,this.darkMode),this.primaryTextColor=wt(this.primaryColor),this.secondaryTextColor=wt(this.secondaryColor),this.tertiaryTextColor=wt(this.primaryColor),this.lineColor=wt(this.background),this.textColor=wt(this.background),this.THEME_COLOR_LIMIT=12,this.nodeBkg="calculated",this.nodeBorder="calculated",this.clusterBkg="calculated",this.clusterBorder="calculated",this.defaultLinkColor="calculated",this.titleColor="#333",this.edgeLabelBackground="#e8e8e8",this.actorBorder="calculated",this.actorBkg="calculated",this.actorTextColor="black",this.actorLineColor="calculated",this.signalColor="#333",this.signalTextColor="#333",this.labelBoxBkgColor="calculated",this.labelBoxBorderColor="#326932",this.labelTextColor="calculated",this.loopTextColor="calculated",this.noteBorderColor="calculated",this.noteBkgColor="#fff5ad",this.noteTextColor="calculated",this.activationBorderColor="#666",this.activationBkgColor="#f4f4f4",this.sequenceNumberColor="white",this.sectionBkgColor="#6eaa49",this.altSectionBkgColor="white",this.sectionBkgColor2="#6eaa49",this.excludeBkgColor="#eeeeee",this.taskBorderColor="calculated",this.taskBkgColor="#487e3a",this.taskTextLightColor="white",this.taskTextColor="calculated",this.taskTextDarkColor="black",this.taskTextOutsideColor="calculated",this.taskTextClickableColor="#003163",this.activeTaskBorderColor="calculated",this.activeTaskBkgColor="calculated",this.gridColor="lightgrey",this.doneTaskBkgColor="lightgrey",this.doneTaskBorderColor="grey",this.critBorderColor="#ff8888",this.critBkgColor="red",this.todayLineColor="red",this.vertLineColor="#00BFFF",this.personBorder=this.primaryBorderColor,this.personBkg=this.mainBkg,this.archEdgeColor="calculated",this.archEdgeArrowColor="calculated",this.archEdgeWidth="3",this.archGroupBorderColor=this.primaryBorderColor,this.archGroupBorderWidth="2px",this.labelColor="black",this.errorBkgColor="#552222",this.errorTextColor="#552222"}updateColors(){this.actorBorder=Ot(this.mainBkg,20),this.actorBkg=this.mainBkg,this.labelBoxBkgColor=this.actorBkg,this.labelTextColor=this.actorTextColor,this.loopTextColor=this.actorTextColor,this.noteBorderColor=this.border2,this.noteTextColor=this.actorTextColor,this.actorLineColor=this.actorBorder,this.cScale0=this.cScale0||this.primaryColor,this.cScale1=this.cScale1||this.secondaryColor,this.cScale2=this.cScale2||this.tertiaryColor,this.cScale3=this.cScale3||Me(this.primaryColor,{h:30}),this.cScale4=this.cScale4||Me(this.primaryColor,{h:60}),this.cScale5=this.cScale5||Me(this.primaryColor,{h:90}),this.cScale6=this.cScale6||Me(this.primaryColor,{h:120}),this.cScale7=this.cScale7||Me(this.primaryColor,{h:150}),this.cScale8=this.cScale8||Me(this.primaryColor,{h:210}),this.cScale9=this.cScale9||Me(this.primaryColor,{h:270}),this.cScale10=this.cScale10||Me(this.primaryColor,{h:300}),this.cScale11=this.cScale11||Me(this.primaryColor,{h:330}),this.cScalePeer1=this.cScalePeer1||Ot(this.secondaryColor,45),this.cScalePeer2=this.cScalePeer2||Ot(this.tertiaryColor,40);for(let e=0;e{this[n]=e[n]}),this.updateColors(),r.forEach(n=>{this[n]=e[n]})}},B$=o(t=>{let e=new i7;return e.calculate(t),e},"getThemeVariables")});var a7,$$,z$=N(()=>{"use strict";js();p0();Oy();a7=class{static{o(this,"Theme")}constructor(){this.primaryColor="#eee",this.contrast="#707070",this.secondaryColor=Dt(this.contrast,55),this.background="#ffffff",this.tertiaryColor=Me(this.primaryColor,{h:-160}),this.primaryBorderColor=ki(this.primaryColor,this.darkMode),this.secondaryBorderColor=ki(this.secondaryColor,this.darkMode),this.tertiaryBorderColor=ki(this.tertiaryColor,this.darkMode),this.primaryTextColor=wt(this.primaryColor),this.secondaryTextColor=wt(this.secondaryColor),this.tertiaryTextColor=wt(this.tertiaryColor),this.lineColor=wt(this.background),this.textColor=wt(this.background),this.mainBkg="#eee",this.secondBkg="calculated",this.lineColor="#666",this.border1="#999",this.border2="calculated",this.note="#ffa",this.text="#333",this.critical="#d42",this.done="#bbb",this.arrowheadColor="#333333",this.fontFamily='"trebuchet ms", verdana, arial, sans-serif',this.fontSize="16px",this.THEME_COLOR_LIMIT=12,this.nodeBkg="calculated",this.nodeBorder="calculated",this.clusterBkg="calculated",this.clusterBorder="calculated",this.defaultLinkColor="calculated",this.titleColor="calculated",this.edgeLabelBackground="white",this.actorBorder="calculated",this.actorBkg="calculated",this.actorTextColor="calculated",this.actorLineColor=this.actorBorder,this.signalColor="calculated",this.signalTextColor="calculated",this.labelBoxBkgColor="calculated",this.labelBoxBorderColor="calculated",this.labelTextColor="calculated",this.loopTextColor="calculated",this.noteBorderColor="calculated",this.noteBkgColor="calculated",this.noteTextColor="calculated",this.activationBorderColor="#666",this.activationBkgColor="#f4f4f4",this.sequenceNumberColor="white",this.sectionBkgColor="calculated",this.altSectionBkgColor="white",this.sectionBkgColor2="calculated",this.excludeBkgColor="#eeeeee",this.taskBorderColor="calculated",this.taskBkgColor="calculated",this.taskTextLightColor="white",this.taskTextColor="calculated",this.taskTextDarkColor="calculated",this.taskTextOutsideColor="calculated",this.taskTextClickableColor="#003163",this.activeTaskBorderColor="calculated",this.activeTaskBkgColor="calculated",this.gridColor="calculated",this.doneTaskBkgColor="calculated",this.doneTaskBorderColor="calculated",this.critBkgColor="calculated",this.critBorderColor="calculated",this.todayLineColor="calculated",this.vertLineColor="calculated",this.personBorder=this.primaryBorderColor,this.personBkg=this.mainBkg,this.archEdgeColor="calculated",this.archEdgeArrowColor="calculated",this.archEdgeWidth="3",this.archGroupBorderColor=this.primaryBorderColor,this.archGroupBorderWidth="2px",this.rowOdd=this.rowOdd||Dt(this.mainBkg,75)||"#ffffff",this.rowEven=this.rowEven||"#f4f4f4",this.labelColor="black",this.errorBkgColor="#552222",this.errorTextColor="#552222"}updateColors(){this.secondBkg=Dt(this.contrast,55),this.border2=this.contrast,this.actorBorder=Dt(this.border1,23),this.actorBkg=this.mainBkg,this.actorTextColor=this.text,this.actorLineColor=this.actorBorder,this.signalColor=this.text,this.signalTextColor=this.text,this.labelBoxBkgColor=this.actorBkg,this.labelBoxBorderColor=this.actorBorder,this.labelTextColor=this.text,this.loopTextColor=this.text,this.noteBorderColor="#999",this.noteBkgColor="#666",this.noteTextColor="#fff",this.cScale0=this.cScale0||"#555",this.cScale1=this.cScale1||"#F4F4F4",this.cScale2=this.cScale2||"#555",this.cScale3=this.cScale3||"#BBB",this.cScale4=this.cScale4||"#777",this.cScale5=this.cScale5||"#999",this.cScale6=this.cScale6||"#DDD",this.cScale7=this.cScale7||"#FFF",this.cScale8=this.cScale8||"#DDD",this.cScale9=this.cScale9||"#BBB",this.cScale10=this.cScale10||"#999",this.cScale11=this.cScale11||"#777";for(let e=0;e{this[n]=e[n]}),this.updateColors(),r.forEach(n=>{this[n]=e[n]})}},$$=o(t=>{let e=new a7;return e.calculate(t),e},"getThemeVariables")});var ko,Z4=N(()=>{"use strict";I$();P$();Py();F$();z$();ko={base:{getThemeVariables:M$},dark:{getThemeVariables:O$},default:{getThemeVariables:hh},forest:{getThemeVariables:B$},neutral:{getThemeVariables:$$}}});var ol,G$=N(()=>{"use strict";ol={flowchart:{useMaxWidth:!0,titleTopMargin:25,subGraphTitleMargin:{top:0,bottom:0},diagramPadding:8,htmlLabels:!0,nodeSpacing:50,rankSpacing:50,curve:"basis",padding:15,defaultRenderer:"dagre-wrapper",wrappingWidth:200,inheritDir:!1},sequence:{useMaxWidth:!0,hideUnusedParticipants:!1,activationWidth:10,diagramMarginX:50,diagramMarginY:10,actorMargin:50,width:150,height:65,boxMargin:10,boxTextMargin:5,noteMargin:10,messageMargin:35,messageAlign:"center",mirrorActors:!0,forceMenus:!1,bottomMarginAdj:1,rightAngles:!1,showSequenceNumbers:!1,actorFontSize:14,actorFontFamily:'"Open Sans", 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this.expect("}"),this.nextToken=r,n}parseExpression(e,r){for(var n=[];;){this.mode==="math"&&this.consumeSpaces();var i=this.fetch();if(t.endOfExpression.indexOf(i.text)!==-1||r&&i.text===r||e&&hh[i.text]&&hh[i.text].infix)break;var a=this.parseAtom(r);if(a){if(a.type==="internal")continue}else break;n.push(a)}return this.mode==="text"&&this.formLigatures(n),this.handleInfixNodes(n)}handleInfixNodes(e){for(var r=-1,n,i=0;i=0&&this.settings.reportNonstrict("unicodeTextInMathMode",'Latin-1/Unicode text character "'+r[0]+'" used in math mode',e);var l=An[this.mode][r].group,u=Xs.range(e),h;if(Mbe.hasOwnProperty(l)){var f=l;h={type:"atom",mode:this.mode,family:f,loc:u,text:r}}else h={type:l,mode:this.mode,loc:u,text:r};s=h}else if(r.charCodeAt(0)>=128)this.settings.strict&&($z(r.charCodeAt(0))?this.mode==="math"&&this.settings.reportNonstrict("unicodeTextInMathMode",'Unicode text character "'+r[0]+'" used in math mode',e):this.settings.reportNonstrict("unknownSymbol",'Unrecognized Unicode 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t{static{o(this,"Parser")}constructor(e,r){this.mode=void 0,this.gullet=void 0,this.settings=void 0,this.leftrightDepth=void 0,this.nextToken=void 0,this.mode="math",this.gullet=new z7(e,r,this.mode),this.settings=r,this.leftrightDepth=0}expect(e,r){if(r===void 0&&(r=!0),this.fetch().text!==e)throw new gt("Expected '"+e+"', got '"+this.fetch().text+"'",this.fetch());r&&this.consume()}consume(){this.nextToken=null}fetch(){return this.nextToken==null&&(this.nextToken=this.gullet.expandNextToken()),this.nextToken}switchMode(e){this.mode=e,this.gullet.switchMode(e)}parse(){this.settings.globalGroup||this.gullet.beginGroup(),this.settings.colorIsTextColor&&this.gullet.macros.set("\\color","\\textcolor");try{var e=this.parseExpression(!1);return this.expect("EOF"),this.settings.globalGroup||this.gullet.endGroup(),e}finally{this.gullet.endGroups()}}subparse(e){var r=this.nextToken;this.consume(),this.gullet.pushToken(new Co("}")),this.gullet.pushTokens(e);var n=this.parseExpression(!1);return this.expect("}"),this.nextToken=r,n}parseExpression(e,r){for(var n=[];;){this.mode==="math"&&this.consumeSpaces();var i=this.fetch();if(t.endOfExpression.indexOf(i.text)!==-1||r&&i.text===r||e&&mh[i.text]&&mh[i.text].infix)break;var a=this.parseAtom(r);if(a){if(a.type==="internal")continue}else break;n.push(a)}return this.mode==="text"&&this.formLigatures(n),this.handleInfixNodes(n)}handleInfixNodes(e){for(var r=-1,n,i=0;i=0&&this.settings.reportNonstrict("unicodeTextInMathMode",'Latin-1/Unicode text character "'+r[0]+'" used in math mode',e);var l=An[this.mode][r].group,u=Ks.range(e),h;if(Dbe.hasOwnProperty(l)){var f=l;h={type:"atom",mode:this.mode,family:f,loc:u,text:r}}else h={type:l,mode:this.mode,loc:u,text:r};s=h}else if(r.charCodeAt(0)>=128)this.settings.strict&&(Hz(r.charCodeAt(0))?this.mode==="math"&&this.settings.reportNonstrict("unicodeTextInMathMode",'Unicode text character "'+r[0]+'" used in math mode',e):this.settings.reportNonstrict("unknownSymbol",'Unrecognized Unicode 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r=this.rules.inline.tag.exec(e);if(r)return!this.lexer.state.inLink&&this.rules.other.startATag.test(r[0])?this.lexer.state.inLink=!0:this.lexer.state.inLink&&this.rules.other.endATag.test(r[0])&&(this.lexer.state.inLink=!1),!this.lexer.state.inRawBlock&&this.rules.other.startPreScriptTag.test(r[0])?this.lexer.state.inRawBlock=!0:this.lexer.state.inRawBlock&&this.rules.other.endPreScriptTag.test(r[0])&&(this.lexer.state.inRawBlock=!1),{type:"html",raw:r[0],inLink:this.lexer.state.inLink,inRawBlock:this.lexer.state.inRawBlock,block:!1,text:r[0]}}link(e){let r=this.rules.inline.link.exec(e);if(r){let n=r[2].trim();if(!this.options.pedantic&&this.rules.other.startAngleBracket.test(n)){if(!this.rules.other.endAngleBracket.test(n))return;let s=f2(n.slice(0,-1),"\\");if((n.length-s.length)%2===0)return}else{let s=$8e(r[2],"()");if(s>-1){let u=(r[0].indexOf("!")===0?5:4)+r[1].length+s;r[2]=r[2].substring(0,s),r[0]=r[0].substring(0,u).trim(),r[3]=""}}let 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s=[...i[0]].length-1,l,u,h=s,f=0,d=i[0][0]==="*"?this.rules.inline.emStrongRDelimAst:this.rules.inline.emStrongRDelimUnd;for(d.lastIndex=0,r=r.slice(-1*e.length+s);(i=d.exec(r))!=null;){if(l=i[1]||i[2]||i[3]||i[4]||i[5]||i[6],!l)continue;if(u=[...l].length,i[3]||i[4]){h+=u;continue}else if((i[5]||i[6])&&s%3&&!((s+u)%3)){f+=u;continue}if(h-=u,h>0)continue;u=Math.min(u,u+h+f);let p=[...i[0]][0].length,m=e.slice(0,s+i.index+p+u);if(Math.min(s,u)%2){let y=m.slice(1,-1);return{type:"em",raw:m,text:y,tokens:this.lexer.inlineTokens(y)}}let g=m.slice(2,-2);return{type:"strong",raw:m,text:g,tokens:this.lexer.inlineTokens(g)}}}}codespan(e){let r=this.rules.inline.code.exec(e);if(r){let n=r[2].replace(this.rules.other.newLineCharGlobal," "),i=this.rules.other.nonSpaceChar.test(n),a=this.rules.other.startingSpaceChar.test(n)&&this.rules.other.endingSpaceChar.test(n);return i&&a&&(n=n.substring(1,n.length-1)),{type:"codespan",raw:r[0],text:n}}}br(e){let r=this.rules.inline.br.exec(e);if(r)return{type:"br",raw:r[0]}}del(e){let r=this.rules.inline.del.exec(e);if(r)return{type:"del",raw:r[0],text:r[2],tokens:this.lexer.inlineTokens(r[2])}}autolink(e){let r=this.rules.inline.autolink.exec(e);if(r){let n,i;return r[2]==="@"?(n=r[1],i="mailto:"+n):(n=r[1],i=n),{type:"link",raw:r[0],text:n,href:i,tokens:[{type:"text",raw:n,text:n}]}}}url(e){let r;if(r=this.rules.inline.url.exec(e)){let n,i;if(r[2]==="@")n=r[0],i="mailto:"+n;else{let a;do a=r[0],r[0]=this.rules.inline._backpedal.exec(r[0])?.[0]??"";while(a!==r[0]);n=r[0],r[1]==="www."?i="http://"+r[0]:i=r[0]}return{type:"link",raw:r[0],text:n,href:i,tokens:[{type:"text",raw:n,text:n}]}}}inlineText(e){let r=this.rules.inline.text.exec(e);if(r){let n=this.lexer.state.inRawBlock;return{type:"text",raw:r[0],text:r[0],escaped:n}}}},Al=class t{static{o(this,"_Lexer")}tokens;options;state;tokenizer;inlineQueue;constructor(e){this.tokens=[],this.tokens.links=Object.create(null),this.options=e||Id,this.options.tokenizer=this.options.tokenizer||new hm,this.tokenizer=this.options.tokenizer,this.tokenizer.options=this.options,this.tokenizer.lexer=this,this.inlineQueue=[],this.state={inLink:!1,inRawBlock:!1,top:!0};let r={other:ts,block:Sw.normal,inline:h2.normal};this.options.pedantic?(r.block=Sw.pedantic,r.inline=h2.pedantic):this.options.gfm&&(r.block=Sw.gfm,this.options.breaks?r.inline=h2.breaks:r.inline=h2.gfm),this.tokenizer.rules=r}static get rules(){return{block:Sw,inline:h2}}static lex(e,r){return new t(r).lex(e)}static lexInline(e,r){return new t(r).inlineTokens(e)}lex(e){e=e.replace(ts.carriageReturn,` +`,e=e.substring(A.length+1),p=S.slice(y)}}a.loose||(l?a.loose=!0:this.rules.other.doubleBlankLine.test(f)&&(l=!0));let v=null,x;this.options.gfm&&(v=this.rules.other.listIsTask.exec(d),v&&(x=v[0]!=="[ ] ",d=d.replace(this.rules.other.listReplaceTask,""))),a.items.push({type:"list_item",raw:f,task:!!v,checked:x,loose:!1,text:d,tokens:[]}),a.raw+=f}let u=a.items.at(-1);if(u)u.raw=u.raw.trimEnd(),u.text=u.text.trimEnd();else return;a.raw=a.raw.trimEnd();for(let h=0;hp.type==="space"),d=f.length>0&&f.some(p=>this.rules.other.anyLine.test(p.raw));a.loose=d}if(a.loose)for(let h=0;h({text:u,tokens:this.lexer.inline(u),header:!1,align:s.align[h]})));return s}}lheading(e){let r=this.rules.block.lheading.exec(e);if(r)return{type:"heading",raw:r[0],depth:r[2].charAt(0)==="="?1:2,text:r[1],tokens:this.lexer.inline(r[1])}}paragraph(e){let r=this.rules.block.paragraph.exec(e);if(r){let n=r[1].charAt(r[1].length-1)===` +`?r[1].slice(0,-1):r[1];return{type:"paragraph",raw:r[0],text:n,tokens:this.lexer.inline(n)}}}text(e){let r=this.rules.block.text.exec(e);if(r)return{type:"text",raw:r[0],text:r[0],tokens:this.lexer.inline(r[0])}}escape(e){let r=this.rules.inline.escape.exec(e);if(r)return{type:"escape",raw:r[0],text:r[1]}}tag(e){let r=this.rules.inline.tag.exec(e);if(r)return!this.lexer.state.inLink&&this.rules.other.startATag.test(r[0])?this.lexer.state.inLink=!0:this.lexer.state.inLink&&this.rules.other.endATag.test(r[0])&&(this.lexer.state.inLink=!1),!this.lexer.state.inRawBlock&&this.rules.other.startPreScriptTag.test(r[0])?this.lexer.state.inRawBlock=!0:this.lexer.state.inRawBlock&&this.rules.other.endPreScriptTag.test(r[0])&&(this.lexer.state.inRawBlock=!1),{type:"html",raw:r[0],inLink:this.lexer.state.inLink,inRawBlock:this.lexer.state.inRawBlock,block:!1,text:r[0]}}link(e){let r=this.rules.inline.link.exec(e);if(r){let n=r[2].trim();if(!this.options.pedantic&&this.rules.other.startAngleBracket.test(n)){if(!this.rules.other.endAngleBracket.test(n))return;let s=x2(n.slice(0,-1),"\\");if((n.length-s.length)%2===0)return}else{let s=I8e(r[2],"()");if(s>-1){let u=(r[0].indexOf("!")===0?5:4)+r[1].length+s;r[2]=r[2].substring(0,s),r[0]=r[0].substring(0,u).trim(),r[3]=""}}let i=r[2],a="";if(this.options.pedantic){let s=this.rules.other.pedanticHrefTitle.exec(i);s&&(i=s[1],a=s[3])}else a=r[3]?r[3].slice(1,-1):"";return i=i.trim(),this.rules.other.startAngleBracket.test(i)&&(this.options.pedantic&&!this.rules.other.endAngleBracket.test(n)?i=i.slice(1):i=i.slice(1,-1)),Wj(r,{href:i&&i.replace(this.rules.inline.anyPunctuation,"$1"),title:a&&a.replace(this.rules.inline.anyPunctuation,"$1")},r[0],this.lexer,this.rules)}}reflink(e,r){let n;if((n=this.rules.inline.reflink.exec(e))||(n=this.rules.inline.nolink.exec(e))){let i=(n[2]||n[1]).replace(this.rules.other.multipleSpaceGlobal," "),a=r[i.toLowerCase()];if(!a){let s=n[0].charAt(0);return{type:"text",raw:s,text:s}}return Wj(n,a,n[0],this.lexer,this.rules)}}emStrong(e,r,n=""){let i=this.rules.inline.emStrongLDelim.exec(e);if(!i||i[3]&&n.match(this.rules.other.unicodeAlphaNumeric))return;if(!(i[1]||i[2]||"")||!n||this.rules.inline.punctuation.exec(n)){let s=[...i[0]].length-1,l,u,h=s,f=0,d=i[0][0]==="*"?this.rules.inline.emStrongRDelimAst:this.rules.inline.emStrongRDelimUnd;for(d.lastIndex=0,r=r.slice(-1*e.length+s);(i=d.exec(r))!=null;){if(l=i[1]||i[2]||i[3]||i[4]||i[5]||i[6],!l)continue;if(u=[...l].length,i[3]||i[4]){h+=u;continue}else if((i[5]||i[6])&&s%3&&!((s+u)%3)){f+=u;continue}if(h-=u,h>0)continue;u=Math.min(u,u+h+f);let p=[...i[0]][0].length,m=e.slice(0,s+i.index+p+u);if(Math.min(s,u)%2){let y=m.slice(1,-1);return{type:"em",raw:m,text:y,tokens:this.lexer.inlineTokens(y)}}let g=m.slice(2,-2);return{type:"strong",raw:m,text:g,tokens:this.lexer.inlineTokens(g)}}}}codespan(e){let r=this.rules.inline.code.exec(e);if(r){let n=r[2].replace(this.rules.other.newLineCharGlobal," "),i=this.rules.other.nonSpaceChar.test(n),a=this.rules.other.startingSpaceChar.test(n)&&this.rules.other.endingSpaceChar.test(n);return i&&a&&(n=n.substring(1,n.length-1)),{type:"codespan",raw:r[0],text:n}}}br(e){let r=this.rules.inline.br.exec(e);if(r)return{type:"br",raw:r[0]}}del(e){let r=this.rules.inline.del.exec(e);if(r)return{type:"del",raw:r[0],text:r[2],tokens:this.lexer.inlineTokens(r[2])}}autolink(e){let r=this.rules.inline.autolink.exec(e);if(r){let n,i;return r[2]==="@"?(n=r[1],i="mailto:"+n):(n=r[1],i=n),{type:"link",raw:r[0],text:n,href:i,tokens:[{type:"text",raw:n,text:n}]}}}url(e){let r;if(r=this.rules.inline.url.exec(e)){let n,i;if(r[2]==="@")n=r[0],i="mailto:"+n;else{let a;do a=r[0],r[0]=this.rules.inline._backpedal.exec(r[0])?.[0]??"";while(a!==r[0]);n=r[0],r[1]==="www."?i="http://"+r[0]:i=r[0]}return{type:"link",raw:r[0],text:n,href:i,tokens:[{type:"text",raw:n,text:n}]}}}inlineText(e){let r=this.rules.inline.text.exec(e);if(r){let n=this.lexer.state.inRawBlock;return{type:"text",raw:r[0],text:r[0],escaped:n}}}},Dl=class t{static{o(this,"_Lexer")}tokens;options;state;tokenizer;inlineQueue;constructor(e){this.tokens=[],this.tokens.links=Object.create(null),this.options=e||Gd,this.options.tokenizer=this.options.tokenizer||new vm,this.tokenizer=this.options.tokenizer,this.tokenizer.options=this.options,this.tokenizer.lexer=this,this.inlineQueue=[],this.state={inLink:!1,inRawBlock:!1,top:!0};let r={other:ts,block:Nw.normal,inline:v2.normal};this.options.pedantic?(r.block=Nw.pedantic,r.inline=v2.pedantic):this.options.gfm&&(r.block=Nw.gfm,this.options.breaks?r.inline=v2.breaks:r.inline=v2.gfm),this.tokenizer.rules=r}static get rules(){return{block:Nw,inline:v2}}static lex(e,r){return new t(r).lex(e)}static lexInline(e,r){return new t(r).inlineTokens(e)}lex(e){e=e.replace(ts.carriageReturn,` `),this.blockTokens(e,this.tokens);for(let r=0;r(i=s.call({lexer:this},e,r))?(e=e.substring(i.raw.length),r.push(i),!0):!1))continue;if(i=this.tokenizer.space(e)){e=e.substring(i.raw.length);let s=r.at(-1);i.raw.length===1&&s!==void 0?s.raw+=` `:r.push(i);continue}if(i=this.tokenizer.code(e)){e=e.substring(i.raw.length);let s=r.at(-1);s?.type==="paragraph"||s?.type==="text"?(s.raw+=` `+i.raw,s.text+=` @@ -418,16 +418,16 @@ ${d}`:d;let p=this.lexer.state.top;if(this.lexer.state.top=!0,this.lexer.blockTo `+i.raw,s.text+=` `+i.text,this.inlineQueue.pop(),this.inlineQueue.at(-1).src=s.text):r.push(i),n=a.length!==e.length,e=e.substring(i.raw.length);continue}if(i=this.tokenizer.text(e)){e=e.substring(i.raw.length);let s=r.at(-1);s?.type==="text"?(s.raw+=` `+i.raw,s.text+=` -`+i.text,this.inlineQueue.pop(),this.inlineQueue.at(-1).src=s.text):r.push(i);continue}if(e){let s="Infinite loop on byte: "+e.charCodeAt(0);if(this.options.silent){console.error(s);break}else throw new Error(s)}}return this.state.top=!0,r}inline(e,r=[]){return this.inlineQueue.push({src:e,tokens:r}),r}inlineTokens(e,r=[]){let n=e,i=null;if(this.tokens.links){let l=Object.keys(this.tokens.links);if(l.length>0)for(;(i=this.tokenizer.rules.inline.reflinkSearch.exec(n))!=null;)l.includes(i[0].slice(i[0].lastIndexOf("[")+1,-1))&&(n=n.slice(0,i.index)+"["+"a".repeat(i[0].length-2)+"]"+n.slice(this.tokenizer.rules.inline.reflinkSearch.lastIndex))}for(;(i=this.tokenizer.rules.inline.blockSkip.exec(n))!=null;)n=n.slice(0,i.index)+"["+"a".repeat(i[0].length-2)+"]"+n.slice(this.tokenizer.rules.inline.blockSkip.lastIndex);for(;(i=this.tokenizer.rules.inline.anyPunctuation.exec(n))!=null;)n=n.slice(0,i.index)+"++"+n.slice(this.tokenizer.rules.inline.anyPunctuation.lastIndex);let a=!1,s="";for(;e;){a||(s=""),a=!1;let l;if(this.options.extensions?.inline?.some(h=>(l=h.call({lexer:this},e,r))?(e=e.substring(l.raw.length),r.push(l),!0):!1))continue;if(l=this.tokenizer.escape(e)){e=e.substring(l.raw.length),r.push(l);continue}if(l=this.tokenizer.tag(e)){e=e.substring(l.raw.length),r.push(l);continue}if(l=this.tokenizer.link(e)){e=e.substring(l.raw.length),r.push(l);continue}if(l=this.tokenizer.reflink(e,this.tokens.links)){e=e.substring(l.raw.length);let h=r.at(-1);l.type==="text"&&h?.type==="text"?(h.raw+=l.raw,h.text+=l.text):r.push(l);continue}if(l=this.tokenizer.emStrong(e,n,s)){e=e.substring(l.raw.length),r.push(l);continue}if(l=this.tokenizer.codespan(e)){e=e.substring(l.raw.length),r.push(l);continue}if(l=this.tokenizer.br(e)){e=e.substring(l.raw.length),r.push(l);continue}if(l=this.tokenizer.del(e)){e=e.substring(l.raw.length),r.push(l);continue}if(l=this.tokenizer.autolink(e)){e=e.substring(l.raw.length),r.push(l);continue}if(!this.state.inLink&&(l=this.tokenizer.url(e))){e=e.substring(l.raw.length),r.push(l);continue}let u=e;if(this.options.extensions?.startInline){let h=1/0,f=e.slice(1),d;this.options.extensions.startInline.forEach(p=>{d=p.call({lexer:this},f),typeof d=="number"&&d>=0&&(h=Math.min(h,d))}),h<1/0&&h>=0&&(u=e.substring(0,h+1))}if(l=this.tokenizer.inlineText(u)){e=e.substring(l.raw.length),l.raw.slice(-1)!=="_"&&(s=l.raw.slice(-1)),a=!0;let h=r.at(-1);h?.type==="text"?(h.raw+=l.raw,h.text+=l.text):r.push(l);continue}if(e){let h="Infinite loop on byte: "+e.charCodeAt(0);if(this.options.silent){console.error(h);break}else throw new Error(h)}}return r}},fm=class{static{o(this,"_Renderer")}options;parser;constructor(e){this.options=e||Id}space(e){return""}code({text:e,lang:r,escaped:n}){let i=(r||"").match(ts.notSpaceStart)?.[0],a=e.replace(ts.endingNewline,"")+` -`;return i?'
'+(n?a:pc(a,!0))+`
-`:"
"+(n?a:pc(a,!0))+`
+`+i.text,this.inlineQueue.pop(),this.inlineQueue.at(-1).src=s.text):r.push(i);continue}if(e){let s="Infinite loop on byte: "+e.charCodeAt(0);if(this.options.silent){console.error(s);break}else throw new Error(s)}}return this.state.top=!0,r}inline(e,r=[]){return this.inlineQueue.push({src:e,tokens:r}),r}inlineTokens(e,r=[]){let n=e,i=null;if(this.tokens.links){let l=Object.keys(this.tokens.links);if(l.length>0)for(;(i=this.tokenizer.rules.inline.reflinkSearch.exec(n))!=null;)l.includes(i[0].slice(i[0].lastIndexOf("[")+1,-1))&&(n=n.slice(0,i.index)+"["+"a".repeat(i[0].length-2)+"]"+n.slice(this.tokenizer.rules.inline.reflinkSearch.lastIndex))}for(;(i=this.tokenizer.rules.inline.blockSkip.exec(n))!=null;)n=n.slice(0,i.index)+"["+"a".repeat(i[0].length-2)+"]"+n.slice(this.tokenizer.rules.inline.blockSkip.lastIndex);for(;(i=this.tokenizer.rules.inline.anyPunctuation.exec(n))!=null;)n=n.slice(0,i.index)+"++"+n.slice(this.tokenizer.rules.inline.anyPunctuation.lastIndex);let a=!1,s="";for(;e;){a||(s=""),a=!1;let l;if(this.options.extensions?.inline?.some(h=>(l=h.call({lexer:this},e,r))?(e=e.substring(l.raw.length),r.push(l),!0):!1))continue;if(l=this.tokenizer.escape(e)){e=e.substring(l.raw.length),r.push(l);continue}if(l=this.tokenizer.tag(e)){e=e.substring(l.raw.length),r.push(l);continue}if(l=this.tokenizer.link(e)){e=e.substring(l.raw.length),r.push(l);continue}if(l=this.tokenizer.reflink(e,this.tokens.links)){e=e.substring(l.raw.length);let h=r.at(-1);l.type==="text"&&h?.type==="text"?(h.raw+=l.raw,h.text+=l.text):r.push(l);continue}if(l=this.tokenizer.emStrong(e,n,s)){e=e.substring(l.raw.length),r.push(l);continue}if(l=this.tokenizer.codespan(e)){e=e.substring(l.raw.length),r.push(l);continue}if(l=this.tokenizer.br(e)){e=e.substring(l.raw.length),r.push(l);continue}if(l=this.tokenizer.del(e)){e=e.substring(l.raw.length),r.push(l);continue}if(l=this.tokenizer.autolink(e)){e=e.substring(l.raw.length),r.push(l);continue}if(!this.state.inLink&&(l=this.tokenizer.url(e))){e=e.substring(l.raw.length),r.push(l);continue}let u=e;if(this.options.extensions?.startInline){let h=1/0,f=e.slice(1),d;this.options.extensions.startInline.forEach(p=>{d=p.call({lexer:this},f),typeof d=="number"&&d>=0&&(h=Math.min(h,d))}),h<1/0&&h>=0&&(u=e.substring(0,h+1))}if(l=this.tokenizer.inlineText(u)){e=e.substring(l.raw.length),l.raw.slice(-1)!=="_"&&(s=l.raw.slice(-1)),a=!0;let h=r.at(-1);h?.type==="text"?(h.raw+=l.raw,h.text+=l.text):r.push(l);continue}if(e){let h="Infinite loop on byte: "+e.charCodeAt(0);if(this.options.silent){console.error(h);break}else throw new Error(h)}}return r}},xm=class{static{o(this,"_Renderer")}options;parser;constructor(e){this.options=e||Gd}space(e){return""}code({text:e,lang:r,escaped:n}){let i=(r||"").match(ts.notSpaceStart)?.[0],a=e.replace(ts.endingNewline,"")+` +`;return i?'
'+(n?a:gc(a,!0))+`
+`:"
"+(n?a:gc(a,!0))+`
`}blockquote({tokens:e}){return`
${this.parser.parse(e)}
`}html({text:e}){return e}heading({tokens:e,depth:r}){return`${this.parser.parseInline(e)} `}hr(e){return`
`}list(e){let r=e.ordered,n=e.start,i="";for(let l=0;l `+i+" -`}listitem(e){let r="";if(e.task){let n=this.checkbox({checked:!!e.checked});e.loose?e.tokens[0]?.type==="paragraph"?(e.tokens[0].text=n+" "+e.tokens[0].text,e.tokens[0].tokens&&e.tokens[0].tokens.length>0&&e.tokens[0].tokens[0].type==="text"&&(e.tokens[0].tokens[0].text=n+" "+pc(e.tokens[0].tokens[0].text),e.tokens[0].tokens[0].escaped=!0)):e.tokens.unshift({type:"text",raw:n+" ",text:n+" ",escaped:!0}):r+=n+" "}return r+=this.parser.parse(e.tokens,!!e.loose),`
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110:this.$=ye[Te-4],lt.setClickEvent(ye[Te-4],ye[Te-3],ye[Te-2]),lt.setTooltip(ye[Te-4],ye[Te]);break;case 111:this.$=ye[Te-2],lt.setLink(ye[Te-2],ye[Te]);break;case 112:this.$=ye[Te-4],lt.setLink(ye[Te-4],ye[Te-2]),lt.setTooltip(ye[Te-4],ye[Te]);break;case 113:this.$=ye[Te-4],lt.setLink(ye[Te-4],ye[Te-2],ye[Te]);break;case 114:this.$=ye[Te-6],lt.setLink(ye[Te-6],ye[Te-4],ye[Te]),lt.setTooltip(ye[Te-6],ye[Te-2]);break;case 117:this.$=ye[Te-1],lt.setLink(ye[Te-1],ye[Te]);break;case 118:this.$=ye[Te-3],lt.setLink(ye[Te-3],ye[Te-2]),lt.setTooltip(ye[Te-3],ye[Te]);break;case 119:this.$=ye[Te-3],lt.setLink(ye[Te-3],ye[Te-2],ye[Te]);break;case 120:this.$=ye[Te-5],lt.setLink(ye[Te-5],ye[Te-4],ye[Te]),lt.setTooltip(ye[Te-5],ye[Te-2]);break;case 121:this.$=ye[Te-4],lt.addVertex(ye[Te-2],void 0,void 0,ye[Te]);break;case 122:this.$=ye[Te-4],lt.updateLink([ye[Te-2]],ye[Te]);break;case 123:this.$=ye[Te-4],lt.updateLink(ye[Te-2],ye[Te]);break;case 124:this.$=ye[Te-8],lt.updateLinkInterpolate([ye[Te-6]],ye[Te-2]),lt.updateLink([ye[Te-6]],ye[Te]);break;case 125:this.$=ye[Te-8],lt.updateLinkInterpolate(ye[Te-6],ye[Te-2]),lt.updateLink(ye[Te-6],ye[Te]);break;case 126:this.$=ye[Te-6],lt.updateLinkInterpolate([ye[Te-4]],ye[Te]);break;case 127:this.$=ye[Te-6],lt.updateLinkInterpolate(ye[Te-4],ye[Te]);break;case 128:case 130:this.$=[ye[Te]];break;case 129:case 131:ye[Te-2].push(ye[Te]),this.$=ye[Te-2];break;case 133:this.$=ye[Te-1]+ye[Te];break;case 181:this.$=ye[Te];break;case 182:this.$=ye[Te-1]+""+ye[Te];break;case 184:this.$=ye[Te-1]+""+ye[Te];break;case 185:this.$={stmt:"dir",value:"TB"};break;case 186:this.$={stmt:"dir",value:"BT"};break;case 187:this.$={stmt:"dir",value:"RL"};break;case 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Wa,AC,Kf,wo,dnt,_C,s0={},O4,nu,_F,P4;;){if(Kf=Kt[Kt.length-1],this.defaultActions[Kf]?wo=this.defaultActions[Kf]:((Wa===null||typeof Wa>"u")&&(Wa=M2e()),wo=Xf[Kf]&&Xf[Kf][Wa]),typeof wo>"u"||!wo.length||!wo[0]){var DC="";P4=[];for(O4 in Xf[Kf])this.terminals_[O4]&&O4>L2e&&P4.push("'"+this.terminals_[O4]+"'");ji.showPosition?DC="Parse error on line "+(Ti+1)+`: +`+ji.showPosition()+` +Expecting `+P4.join(", ")+", got '"+(this.terminals_[Wa]||Wa)+"'":DC="Parse error on line "+(Ti+1)+": Unexpected "+(Wa==AF?"end of input":"'"+(this.terminals_[Wa]||Wa)+"'"),this.parseError(DC,{text:ji.match,token:this.terminals_[Wa]||Wa,line:ji.yylineno,loc:CC,expected:P4})}if(wo[0]instanceof Array&&wo.length>1)throw new Error("Parse Error: multiple actions possible at state: "+Kf+", token: "+Wa);switch(wo[0]){case 1:Kt.push(Wa),Cn.push(ji.yytext),ge.push(ji.yylloc),Kt.push(wo[1]),Wa=null,AC?(Wa=AC,AC=null):(SF=ji.yyleng,Te=ji.yytext,Ti=ji.yylineno,CC=ji.yylloc,CF>0&&CF--);break;case 2:if(nu=this.productions_[wo[1]][1],s0.$=Cn[Cn.length-nu],s0._$={first_line:ge[ge.length-(nu||1)].first_line,last_line:ge[ge.length-1].last_line,first_column:ge[ge.length-(nu||1)].first_column,last_column:ge[ge.length-1].last_column},N2e&&(s0._$.range=[ge[ge.length-(nu||1)].range[0],ge[ge.length-1].range[1]]),_C=this.performAction.apply(s0,[Te,SF,Ti,jf.yy,wo[1],Cn,ge].concat(R2e)),typeof _C<"u")return _C;nu&&(Kt=Kt.slice(0,-1*nu*2),Cn=Cn.slice(0,-1*nu),ge=ge.slice(0,-1*nu)),Kt.push(this.productions_[wo[1]][0]),Cn.push(s0.$),ge.push(s0._$),_F=Xf[Kt[Kt.length-2]][Kt[Kt.length-1]],Kt.push(_F);break;case 3:return!0}}return!0},"parse")},Zn=function(){var Hr={EOF:1,parseError:o(function(mt,Kt){if(this.yy.parser)this.yy.parser.parseError(mt,Kt);else throw new Error(mt)},"parseError"),setInput:o(function(et,mt){return this.yy=mt||this.yy||{},this._input=et,this._more=this._backtrack=this.done=!1,this.yylineno=this.yyleng=0,this.yytext=this.matched=this.match="",this.conditionStack=["INITIAL"],this.yylloc={first_line:1,first_column:0,last_line:1,last_column:0},this.options.ranges&&(this.yylloc.range=[0,0]),this.offset=0,this},"setInput"),input:o(function(){var et=this._input[0];this.yytext+=et,this.yyleng++,this.offset++,this.match+=et,this.matched+=et;var mt=et.match(/(?:\r\n?|\n).*/g);return mt?(this.yylineno++,this.yylloc.last_line++):this.yylloc.last_column++,this.options.ranges&&this.yylloc.range[1]++,this._input=this._input.slice(1),et},"input"),unput:o(function(et){var mt=et.length,Kt=et.split(/(?:\r\n?|\n)/g);this._input=et+this._input,this.yytext=this.yytext.substr(0,this.yytext.length-mt),this.offset-=mt;var lt=this.match.split(/(?:\r\n?|\n)/g);this.match=this.match.substr(0,this.match.length-1),this.matched=this.matched.substr(0,this.matched.length-1),Kt.length-1&&(this.yylineno-=Kt.length-1);var Cn=this.yylloc.range;return this.yylloc={first_line:this.yylloc.first_line,last_line:this.yylineno+1,first_column:this.yylloc.first_column,last_column:Kt?(Kt.length===lt.length?this.yylloc.first_column:0)+lt[lt.length-Kt.length].length-Kt[0].length:this.yylloc.first_column-mt},this.options.ranges&&(this.yylloc.range=[Cn[0],Cn[0]+this.yyleng-mt]),this.yyleng=this.yytext.length,this},"unput"),more:o(function(){return this._more=!0,this},"more"),reject:o(function(){if(this.options.backtrack_lexer)this._backtrack=!0;else return this.parseError("Lexical error on line "+(this.yylineno+1)+`. You can only invoke reject() in the lexer when the lexer is of the backtracking persuasion (options.backtrack_lexer = true). `+this.showPosition(),{text:"",token:null,line:this.yylineno});return this},"reject"),less:o(function(et){this.unput(this.match.slice(et))},"less"),pastInput:o(function(){var et=this.matched.substr(0,this.matched.length-this.match.length);return(et.length>20?"...":"")+et.substr(-20).replace(/\n/g,"")},"pastInput"),upcomingInput:o(function(){var et=this.match;return et.length<20&&(et+=this._input.substr(0,20-et.length)),(et.substr(0,20)+(et.length>20?"...":"")).replace(/\n/g,"")},"upcomingInput"),showPosition:o(function(){var et=this.pastInput(),mt=new Array(et.length+1).join("-");return et+this.upcomingInput()+` -`+mt+"^"},"showPosition"),test_match:o(function(et,mt){var Kt,lt,Cn;if(this.options.backtrack_lexer&&(Cn={yylineno:this.yylineno,yylloc:{first_line:this.yylloc.first_line,last_line:this.last_line,first_column:this.yylloc.first_column,last_column:this.yylloc.last_column},yytext:this.yytext,match:this.match,matches:this.matches,matched:this.matched,yyleng:this.yyleng,offset:this.offset,_more:this._more,_input:this._input,yy:this.yy,conditionStack:this.conditionStack.slice(0),done:this.done},this.options.ranges&&(Cn.yylloc.range=this.yylloc.range.slice(0))),lt=et[0].match(/(?:\r\n?|\n).*/g),lt&&(this.yylineno+=lt.length),this.yylloc={first_line:this.yylloc.last_line,last_line:this.yylineno+1,first_column:this.yylloc.last_column,last_column:lt?lt[lt.length-1].length-lt[lt.length-1].match(/\r?\n?/)[0].length:this.yylloc.last_column+et[0].length},this.yytext+=et[0],this.match+=et[0],this.matches=et,this.yyleng=this.yytext.length,this.options.ranges&&(this.yylloc.range=[this.offset,this.offset+=this.yyleng]),this._more=!1,this._backtrack=!1,this._input=this._input.slice(et[0].length),this.matched+=et[0],Kt=this.performAction.call(this,this.yy,this,mt,this.conditionStack[this.conditionStack.length-1]),this.done&&this._input&&(this.done=!1),Kt)return Kt;if(this._backtrack){for(var ye in Cn)this[ye]=Cn[ye];return!1}return!1},"test_match"),next:o(function(){if(this.done)return this.EOF;this._input||(this.done=!0);var et,mt,Kt,lt;this._more||(this.yytext="",this.match="");for(var Cn=this._currentRules(),ye=0;yemt[0].length)){if(mt=Kt,lt=ye,this.options.backtrack_lexer){if(et=this.test_match(Kt,Cn[ye]),et!==!1)return et;if(this._backtrack){mt=!1;continue}else return!1}else if(!this.options.flex)break}return mt?(et=this.test_match(mt,Cn[lt]),et!==!1?et:!1):this._input===""?this.EOF:this.parseError("Lexical error on line "+(this.yylineno+1)+`. Unrecognized text. -`+this.showPosition(),{text:"",token:null,line:this.yylineno})},"next"),lex:o(function(){var mt=this.next();return mt||this.lex()},"lex"),begin:o(function(mt){this.conditionStack.push(mt)},"begin"),popState:o(function(){var mt=this.conditionStack.length-1;return mt>0?this.conditionStack.pop():this.conditionStack[0]},"popState"),_currentRules:o(function(){return this.conditionStack.length&&this.conditionStack[this.conditionStack.length-1]?this.conditions[this.conditionStack[this.conditionStack.length-1]].rules:this.conditions.INITIAL.rules},"_currentRules"),topState:o(function(mt){return mt=this.conditionStack.length-1-Math.abs(mt||0),mt>=0?this.conditionStack[mt]:"INITIAL"},"topState"),pushState:o(function(mt){this.begin(mt)},"pushState"),stateStackSize:o(function(){return this.conditionStack.length},"stateStackSize"),options:{},performAction:o(function(mt,Kt,lt,Cn){var ye=Cn;switch(lt){case 0:return this.begin("acc_title"),34;break;case 1:return this.popState(),"acc_title_value";break;case 2:return this.begin("acc_descr"),36;break;case 3:return this.popState(),"acc_descr_value";break;case 4:this.begin("acc_descr_multiline");break;case 5:this.popState();break;case 6:return"acc_descr_multiline_value";case 7:return this.pushState("shapeData"),Kt.yytext="",40;break;case 8:return this.pushState("shapeDataStr"),40;break;case 9:return this.popState(),40;break;case 10:let Vf=/\n\s*/g;return Kt.yytext=Kt.yytext.replace(Vf,"
    "),40;break;case 11:return 40;case 12:this.popState();break;case 13:this.begin("callbackname");break;case 14:this.popState();break;case 15:this.popState(),this.begin("callbackargs");break;case 16:return 95;case 17:this.popState();break;case 18:return 96;case 19:return"MD_STR";case 20:this.popState();break;case 21:this.begin("md_string");break;case 22:return"STR";case 23:this.popState();break;case 24:this.pushState("string");break;case 25:return 84;case 26:return 102;case 27:return 85;case 28:return 104;case 29:return 86;case 30:return 87;case 31:return 97;case 32:this.begin("click");break;case 33:this.popState();break;case 34:return 88;case 35:return mt.lex.firstGraph()&&this.begin("dir"),12;break;case 36:return mt.lex.firstGraph()&&this.begin("dir"),12;break;case 37:return mt.lex.firstGraph()&&this.begin("dir"),12;break;case 38:return 27;case 39:return 32;case 40:return 98;case 41:return 98;case 42:return 98;case 43:return 98;case 44:return this.popState(),13;break;case 45:return this.popState(),14;break;case 46:return this.popState(),14;break;case 47:return this.popState(),14;break;case 48:return this.popState(),14;break;case 49:return this.popState(),14;break;case 50:return this.popState(),14;break;case 51:return this.popState(),14;break;case 52:return this.popState(),14;break;case 53:return this.popState(),14;break;case 54:return this.popState(),14;break;case 55:return 121;case 56:return 122;case 57:return 123;case 58:return 124;case 59:return 78;case 60:return 105;case 61:return 111;case 62:return 46;case 63:return 60;case 64:return 44;case 65:return 8;case 66:return 106;case 67:return 115;case 68:return this.popState(),77;break;case 69:return this.pushState("edgeText"),75;break;case 70:return 119;case 71:return this.popState(),77;break;case 72:return this.pushState("thickEdgeText"),75;break;case 73:return 119;case 74:return this.popState(),77;break;case 75:return this.pushState("dottedEdgeText"),75;break;case 76:return 119;case 77:return 77;case 78:return this.popState(),53;break;case 79:return"TEXT";case 80:return this.pushState("ellipseText"),52;break;case 81:return this.popState(),55;break;case 82:return this.pushState("text"),54;break;case 83:return this.popState(),57;break;case 84:return this.pushState("text"),56;break;case 85:return 58;case 86:return this.pushState("text"),67;break;case 87:return this.popState(),64;break;case 88:return this.pushState("text"),63;break;case 89:return this.popState(),49;break;case 90:return this.pushState("text"),48;break;case 91:return this.popState(),69;break;case 92:return this.popState(),71;break;case 93:return 117;case 94:return this.pushState("trapText"),68;break;case 95:return this.pushState("trapText"),70;break;case 96:return 118;case 97:return 67;case 98:return 90;case 99:return"SEP";case 100:return 89;case 101:return 115;case 102:return 111;case 103:return 44;case 104:return 109;case 105:return 114;case 106:return 116;case 107:return this.popState(),62;break;case 108:return this.pushState("text"),62;break;case 109:return this.popState(),51;break;case 110:return this.pushState("text"),50;break;case 111:return this.popState(),31;break;case 112:return this.pushState("text"),29;break;case 113:return this.popState(),66;break;case 114:return this.pushState("text"),65;break;case 115:return"TEXT";case 116:return"QUOTE";case 117:return 9;case 118:return 10;case 119:return 11}},"anonymous"),rules:[/^(?:accTitle\s*:\s*)/,/^(?:(?!\n||)*[^\n]*)/,/^(?:accDescr\s*:\s*)/,/^(?:(?!\n||)*[^\n]*)/,/^(?:accDescr\s*\{\s*)/,/^(?:[\}])/,/^(?:[^\}]*)/,/^(?:@\{)/,/^(?:["])/,/^(?:["])/,/^(?:[^\"]+)/,/^(?:[^}^"]+)/,/^(?:\})/,/^(?:call[\s]+)/,/^(?:\([\s]*\))/,/^(?:\()/,/^(?:[^(]*)/,/^(?:\))/,/^(?:[^)]*)/,/^(?:[^`"]+)/,/^(?:[`]["])/,/^(?:["][`])/,/^(?:[^"]+)/,/^(?:["])/,/^(?:["])/,/^(?:style\b)/,/^(?:default\b)/,/^(?:linkStyle\b)/,/^(?:interpolate\b)/,/^(?:classDef\b)/,/^(?:class\b)/,/^(?:href[\s])/,/^(?:click[\s]+)/,/^(?:[\s\n])/,/^(?:[^\s\n]*)/,/^(?:flowchart-elk\b)/,/^(?:graph\b)/,/^(?:flowchart\b)/,/^(?:subgraph\b)/,/^(?:end\b\s*)/,/^(?:_self\b)/,/^(?:_blank\b)/,/^(?:_parent\b)/,/^(?:_top\b)/,/^(?:(\r?\n)*\s*\n)/,/^(?:\s*LR\b)/,/^(?:\s*RL\b)/,/^(?:\s*TB\b)/,/^(?:\s*BT\b)/,/^(?:\s*TD\b)/,/^(?:\s*BR\b)/,/^(?:\s*<)/,/^(?:\s*>)/,/^(?:\s*\^)/,/^(?:\s*v\b)/,/^(?:.*direction\s+TB[^\n]*)/,/^(?:.*direction\s+BT[^\n]*)/,/^(?:.*direction\s+RL[^\n]*)/,/^(?:.*direction\s+LR[^\n]*)/,/^(?:[^\s\"]+@(?=[^\{\"]))/,/^(?:[0-9]+)/,/^(?:#)/,/^(?::::)/,/^(?::)/,/^(?:&)/,/^(?:;)/,/^(?:,)/,/^(?:\*)/,/^(?:\s*[xo<]?--+[-xo>]\s*)/,/^(?:\s*[xo<]?--\s*)/,/^(?:[^-]|-(?!-)+)/,/^(?:\s*[xo<]?==+[=xo>]\s*)/,/^(?:\s*[xo<]?==\s*)/,/^(?:[^=]|=(?!))/,/^(?:\s*[xo<]?-?\.+-[xo>]?\s*)/,/^(?:\s*[xo<]?-\.\s*)/,/^(?:[^\.]|\.(?!))/,/^(?:\s*~~[\~]+\s*)/,/^(?:[-/\)][\)])/,/^(?:[^\(\)\[\]\{\}]|!\)+)/,/^(?:\(-)/,/^(?:\]\))/,/^(?:\(\[)/,/^(?:\]\])/,/^(?:\[\[)/,/^(?:\[\|)/,/^(?:>)/,/^(?:\)\])/,/^(?:\[\()/,/^(?:\)\)\))/,/^(?:\(\(\()/,/^(?:[\\(?=\])][\]])/,/^(?:\/(?=\])\])/,/^(?:\/(?!\])|\\(?!\])|[^\\\[\]\(\)\{\}\/]+)/,/^(?:\[\/)/,/^(?:\[\\)/,/^(?:<)/,/^(?:>)/,/^(?:\^)/,/^(?:\\\|)/,/^(?:v\b)/,/^(?:\*)/,/^(?:#)/,/^(?:&)/,/^(?:([A-Za-z0-9!"\#$%&'*+\.`?\\_\/]|-(?=[^\>\-\.])|(?!))+)/,/^(?:-)/,/^(?:[\u00AA\u00B5\u00BA\u00C0-\u00D6\u00D8-\u00F6]|[\u00F8-\u02C1\u02C6-\u02D1\u02E0-\u02E4\u02EC\u02EE\u0370-\u0374\u0376\u0377]|[\u037A-\u037D\u0386\u0388-\u038A\u038C\u038E-\u03A1\u03A3-\u03F5]|[\u03F7-\u0481\u048A-\u0527\u0531-\u0556\u0559\u0561-\u0587\u05D0-\u05EA]|[\u05F0-\u05F2\u0620-\u064A\u066E\u066F\u0671-\u06D3\u06D5\u06E5\u06E6\u06EE]|[\u06EF\u06FA-\u06FC\u06FF\u0710\u0712-\u072F\u074D-\u07A5\u07B1\u07CA-\u07EA]|[\u07F4\u07F5\u07FA\u0800-\u0815\u081A\u0824\u0828\u0840-\u0858\u08A0]|[\u08A2-\u08AC\u0904-\u0939\u093D\u0950\u0958-\u0961\u0971-\u0977]|[\u0979-\u097F\u0985-\u098C\u098F\u0990\u0993-\u09A8\u09AA-\u09B0\u09B2]|[\u09B6-\u09B9\u09BD\u09CE\u09DC\u09DD\u09DF-\u09E1\u09F0\u09F1\u0A05-\u0A0A]|[\u0A0F\u0A10\u0A13-\u0A28\u0A2A-\u0A30\u0A32\u0A33\u0A35\u0A36\u0A38\u0A39]|[\u0A59-\u0A5C\u0A5E\u0A72-\u0A74\u0A85-\u0A8D\u0A8F-\u0A91\u0A93-\u0AA8]|[\u0AAA-\u0AB0\u0AB2\u0AB3\u0AB5-\u0AB9\u0ABD\u0AD0\u0AE0\u0AE1\u0B05-\u0B0C]|[\u0B0F\u0B10\u0B13-\u0B28\u0B2A-\u0B30\u0B32\u0B33\u0B35-\u0B39\u0B3D\u0B5C]|[\u0B5D\u0B5F-\u0B61\u0B71\u0B83\u0B85-\u0B8A\u0B8E-\u0B90\u0B92-\u0B95\u0B99]|[\u0B9A\u0B9C\u0B9E\u0B9F\u0BA3\u0BA4\u0BA8-\u0BAA\u0BAE-\u0BB9\u0BD0]|[\u0C05-\u0C0C\u0C0E-\u0C10\u0C12-\u0C28\u0C2A-\u0C33\u0C35-\u0C39\u0C3D]|[\u0C58\u0C59\u0C60\u0C61\u0C85-\u0C8C\u0C8E-\u0C90\u0C92-\u0CA8\u0CAA-\u0CB3]|[\u0CB5-\u0CB9\u0CBD\u0CDE\u0CE0\u0CE1\u0CF1\u0CF2\u0D05-\u0D0C\u0D0E-\u0D10]|[\u0D12-\u0D3A\u0D3D\u0D4E\u0D60\u0D61\u0D7A-\u0D7F\u0D85-\u0D96\u0D9A-\u0DB1]|[\u0DB3-\u0DBB\u0DBD\u0DC0-\u0DC6\u0E01-\u0E30\u0E32\u0E33\u0E40-\u0E46\u0E81]|[\u0E82\u0E84\u0E87\u0E88\u0E8A\u0E8D\u0E94-\u0E97\u0E99-\u0E9F\u0EA1-\u0EA3]|[\u0EA5\u0EA7\u0EAA\u0EAB\u0EAD-\u0EB0\u0EB2\u0EB3\u0EBD\u0EC0-\u0EC4\u0EC6]|[\u0EDC-\u0EDF\u0F00\u0F40-\u0F47\u0F49-\u0F6C\u0F88-\u0F8C\u1000-\u102A]|[\u103F\u1050-\u1055\u105A-\u105D\u1061\u1065\u1066\u106E-\u1070\u1075-\u1081]|[\u108E\u10A0-\u10C5\u10C7\u10CD\u10D0-\u10FA\u10FC-\u1248\u124A-\u124D]|[\u1250-\u1256\u1258\u125A-\u125D\u1260-\u1288\u128A-\u128D\u1290-\u12B0]|[\u12B2-\u12B5\u12B8-\u12BE\u12C0\u12C2-\u12C5\u12C8-\u12D6\u12D8-\u1310]|[\u1312-\u1315\u1318-\u135A\u1380-\u138F\u13A0-\u13F4\u1401-\u166C]|[\u166F-\u167F\u1681-\u169A\u16A0-\u16EA\u1700-\u170C\u170E-\u1711]|[\u1720-\u1731\u1740-\u1751\u1760-\u176C\u176E-\u1770\u1780-\u17B3\u17D7]|[\u17DC\u1820-\u1877\u1880-\u18A8\u18AA\u18B0-\u18F5\u1900-\u191C]|[\u1950-\u196D\u1970-\u1974\u1980-\u19AB\u19C1-\u19C7\u1A00-\u1A16]|[\u1A20-\u1A54\u1AA7\u1B05-\u1B33\u1B45-\u1B4B\u1B83-\u1BA0\u1BAE\u1BAF]|[\u1BBA-\u1BE5\u1C00-\u1C23\u1C4D-\u1C4F\u1C5A-\u1C7D\u1CE9-\u1CEC]|[\u1CEE-\u1CF1\u1CF5\u1CF6\u1D00-\u1DBF\u1E00-\u1F15\u1F18-\u1F1D]|[\u1F20-\u1F45\u1F48-\u1F4D\u1F50-\u1F57\u1F59\u1F5B\u1F5D\u1F5F-\u1F7D]|[\u1F80-\u1FB4\u1FB6-\u1FBC\u1FBE\u1FC2-\u1FC4\u1FC6-\u1FCC\u1FD0-\u1FD3]|[\u1FD6-\u1FDB\u1FE0-\u1FEC\u1FF2-\u1FF4\u1FF6-\u1FFC\u2071\u207F]|[\u2090-\u209C\u2102\u2107\u210A-\u2113\u2115\u2119-\u211D\u2124\u2126\u2128]|[\u212A-\u212D\u212F-\u2139\u213C-\u213F\u2145-\u2149\u214E\u2183\u2184]|[\u2C00-\u2C2E\u2C30-\u2C5E\u2C60-\u2CE4\u2CEB-\u2CEE\u2CF2\u2CF3]|[\u2D00-\u2D25\u2D27\u2D2D\u2D30-\u2D67\u2D6F\u2D80-\u2D96\u2DA0-\u2DA6]|[\u2DA8-\u2DAE\u2DB0-\u2DB6\u2DB8-\u2DBE\u2DC0-\u2DC6\u2DC8-\u2DCE]|[\u2DD0-\u2DD6\u2DD8-\u2DDE\u2E2F\u3005\u3006\u3031-\u3035\u303B\u303C]|[\u3041-\u3096\u309D-\u309F\u30A1-\u30FA\u30FC-\u30FF\u3105-\u312D]|[\u3131-\u318E\u31A0-\u31BA\u31F0-\u31FF\u3400-\u4DB5\u4E00-\u9FCC]|[\uA000-\uA48C\uA4D0-\uA4FD\uA500-\uA60C\uA610-\uA61F\uA62A\uA62B]|[\uA640-\uA66E\uA67F-\uA697\uA6A0-\uA6E5\uA717-\uA71F\uA722-\uA788]|[\uA78B-\uA78E\uA790-\uA793\uA7A0-\uA7AA\uA7F8-\uA801\uA803-\uA805]|[\uA807-\uA80A\uA80C-\uA822\uA840-\uA873\uA882-\uA8B3\uA8F2-\uA8F7\uA8FB]|[\uA90A-\uA925\uA930-\uA946\uA960-\uA97C\uA984-\uA9B2\uA9CF\uAA00-\uAA28]|[\uAA40-\uAA42\uAA44-\uAA4B\uAA60-\uAA76\uAA7A\uAA80-\uAAAF\uAAB1\uAAB5]|[\uAAB6\uAAB9-\uAABD\uAAC0\uAAC2\uAADB-\uAADD\uAAE0-\uAAEA\uAAF2-\uAAF4]|[\uAB01-\uAB06\uAB09-\uAB0E\uAB11-\uAB16\uAB20-\uAB26\uAB28-\uAB2E]|[\uABC0-\uABE2\uAC00-\uD7A3\uD7B0-\uD7C6\uD7CB-\uD7FB\uF900-\uFA6D]|[\uFA70-\uFAD9\uFB00-\uFB06\uFB13-\uFB17\uFB1D\uFB1F-\uFB28\uFB2A-\uFB36]|[\uFB38-\uFB3C\uFB3E\uFB40\uFB41\uFB43\uFB44\uFB46-\uFBB1\uFBD3-\uFD3D]|[\uFD50-\uFD8F\uFD92-\uFDC7\uFDF0-\uFDFB\uFE70-\uFE74\uFE76-\uFEFC]|[\uFF21-\uFF3A\uFF41-\uFF5A\uFF66-\uFFBE\uFFC2-\uFFC7\uFFCA-\uFFCF]|[\uFFD2-\uFFD7\uFFDA-\uFFDC])/,/^(?:\|)/,/^(?:\|)/,/^(?:\))/,/^(?:\()/,/^(?:\])/,/^(?:\[)/,/^(?:(\}))/,/^(?:\{)/,/^(?:[^\[\]\(\)\{\}\|\"]+)/,/^(?:")/,/^(?:(\r?\n)+)/,/^(?:\s)/,/^(?:$)/],conditions:{shapeDataEndBracket:{rules:[21,24,77,80,82,84,88,90,94,95,108,110,112,114],inclusive:!1},shapeDataStr:{rules:[9,10,21,24,77,80,82,84,88,90,94,95,108,110,112,114],inclusive:!1},shapeData:{rules:[8,11,12,21,24,77,80,82,84,88,90,94,95,108,110,112,114],inclusive:!1},callbackargs:{rules:[17,18,21,24,77,80,82,84,88,90,94,95,108,110,112,114],inclusive:!1},callbackname:{rules:[14,15,16,21,24,77,80,82,84,88,90,94,95,108,110,112,114],inclusive:!1},href:{rules:[21,24,77,80,82,84,88,90,94,95,108,110,112,114],inclusive:!1},click:{rules:[21,24,33,34,77,80,82,84,88,90,94,95,108,110,112,114],inclusive:!1},dottedEdgeText:{rules:[21,24,74,76,77,80,82,84,88,90,94,95,108,110,112,114],inclusive:!1},thickEdgeText:{rules:[21,24,71,73,77,80,82,84,88,90,94,95,108,110,112,114],inclusive:!1},edgeText:{rules:[21,24,68,70,77,80,82,84,88,90,94,95,108,110,112,114],inclusive:!1},trapText:{rules:[21,24,77,80,82,84,88,90,91,92,93,94,95,108,110,112,114],inclusive:!1},ellipseText:{rules:[21,24,77,78,79,80,82,84,88,90,94,95,108,110,112,114],inclusive:!1},text:{rules:[21,24,77,80,81,82,83,84,87,88,89,90,94,95,107,108,109,110,111,112,113,114,115],inclusive:!1},vertex:{rules:[21,24,77,80,82,84,88,90,94,95,108,110,112,114],inclusive:!1},dir:{rules:[21,24,44,45,46,47,48,49,50,51,52,53,54,77,80,82,84,88,90,94,95,108,110,112,114],inclusive:!1},acc_descr_multiline:{rules:[5,6,21,24,77,80,82,84,88,90,94,95,108,110,112,114],inclusive:!1},acc_descr:{rules:[3,21,24,77,80,82,84,88,90,94,95,108,110,112,114],inclusive:!1},acc_title:{rules:[1,21,24,77,80,82,84,88,90,94,95,108,110,112,114],inclusive:!1},md_string:{rules:[19,20,21,24,77,80,82,84,88,90,94,95,108,110,112,114],inclusive:!1},string:{rules:[21,22,23,24,77,80,82,84,88,90,94,95,108,110,112,114],inclusive:!1},INITIAL:{rules:[0,2,4,7,13,21,24,25,26,27,28,29,30,31,32,35,36,37,38,39,40,41,42,43,55,56,57,58,59,60,61,62,63,64,65,66,67,68,69,71,72,74,75,77,80,82,84,85,86,88,90,94,95,96,97,98,99,100,101,102,103,104,105,106,108,110,112,114,116,117,118,119],inclusive:!0}}};return Hr}();Ni.lexer=Zn;function Sn(){this.yy={}}return o(Sn,"Parser"),Sn.prototype=Ni,Ni.Parser=Sn,new Sn}();xR.parser=xR;bR=xR});var Uie,Hie,Wie=N(()=>{"use strict";Vie();Uie=Object.assign({},bR);Uie.parse=t=>{let e=t.replace(/}\s*\n/g,`} -`);return bR.parse(e)};Hie=Uie});var gOe,yOe,qie,Yie=N(()=>{"use strict";Ys();gOe=o((t,e)=>{let r=Kf,n=r(t,"r"),i=r(t,"g"),a=r(t,"b");return qa(n,i,a,e)},"fade"),yOe=o(t=>`.label { +`+mt+"^"},"showPosition"),test_match:o(function(et,mt){var Kt,lt,Cn;if(this.options.backtrack_lexer&&(Cn={yylineno:this.yylineno,yylloc:{first_line:this.yylloc.first_line,last_line:this.last_line,first_column:this.yylloc.first_column,last_column:this.yylloc.last_column},yytext:this.yytext,match:this.match,matches:this.matches,matched:this.matched,yyleng:this.yyleng,offset:this.offset,_more:this._more,_input:this._input,yy:this.yy,conditionStack:this.conditionStack.slice(0),done:this.done},this.options.ranges&&(Cn.yylloc.range=this.yylloc.range.slice(0))),lt=et[0].match(/(?:\r\n?|\n).*/g),lt&&(this.yylineno+=lt.length),this.yylloc={first_line:this.yylloc.last_line,last_line:this.yylineno+1,first_column:this.yylloc.last_column,last_column:lt?lt[lt.length-1].length-lt[lt.length-1].match(/\r?\n?/)[0].length:this.yylloc.last_column+et[0].length},this.yytext+=et[0],this.match+=et[0],this.matches=et,this.yyleng=this.yytext.length,this.options.ranges&&(this.yylloc.range=[this.offset,this.offset+=this.yyleng]),this._more=!1,this._backtrack=!1,this._input=this._input.slice(et[0].length),this.matched+=et[0],Kt=this.performAction.call(this,this.yy,this,mt,this.conditionStack[this.conditionStack.length-1]),this.done&&this._input&&(this.done=!1),Kt)return Kt;if(this._backtrack){for(var ge in Cn)this[ge]=Cn[ge];return!1}return!1},"test_match"),next:o(function(){if(this.done)return this.EOF;this._input||(this.done=!0);var et,mt,Kt,lt;this._more||(this.yytext="",this.match="");for(var Cn=this._currentRules(),ge=0;gemt[0].length)){if(mt=Kt,lt=ge,this.options.backtrack_lexer){if(et=this.test_match(Kt,Cn[ge]),et!==!1)return et;if(this._backtrack){mt=!1;continue}else return!1}else if(!this.options.flex)break}return mt?(et=this.test_match(mt,Cn[lt]),et!==!1?et:!1):this._input===""?this.EOF:this.parseError("Lexical error on line "+(this.yylineno+1)+`. Unrecognized text. +`+this.showPosition(),{text:"",token:null,line:this.yylineno})},"next"),lex:o(function(){var mt=this.next();return mt||this.lex()},"lex"),begin:o(function(mt){this.conditionStack.push(mt)},"begin"),popState:o(function(){var mt=this.conditionStack.length-1;return mt>0?this.conditionStack.pop():this.conditionStack[0]},"popState"),_currentRules:o(function(){return this.conditionStack.length&&this.conditionStack[this.conditionStack.length-1]?this.conditions[this.conditionStack[this.conditionStack.length-1]].rules:this.conditions.INITIAL.rules},"_currentRules"),topState:o(function(mt){return mt=this.conditionStack.length-1-Math.abs(mt||0),mt>=0?this.conditionStack[mt]:"INITIAL"},"topState"),pushState:o(function(mt){this.begin(mt)},"pushState"),stateStackSize:o(function(){return this.conditionStack.length},"stateStackSize"),options:{},performAction:o(function(mt,Kt,lt,Cn){var ge=Cn;switch(lt){case 0:return this.begin("acc_title"),34;break;case 1:return this.popState(),"acc_title_value";break;case 2:return this.begin("acc_descr"),36;break;case 3:return this.popState(),"acc_descr_value";break;case 4:this.begin("acc_descr_multiline");break;case 5:this.popState();break;case 6:return"acc_descr_multiline_value";case 7:return this.pushState("shapeData"),Kt.yytext="",40;break;case 8:return this.pushState("shapeDataStr"),40;break;case 9:return this.popState(),40;break;case 10:let Xf=/\n\s*/g;return Kt.yytext=Kt.yytext.replace(Xf,"
    "),40;break;case 11:return 40;case 12:this.popState();break;case 13:this.begin("callbackname");break;case 14:this.popState();break;case 15:this.popState(),this.begin("callbackargs");break;case 16:return 95;case 17:this.popState();break;case 18:return 96;case 19:return"MD_STR";case 20:this.popState();break;case 21:this.begin("md_string");break;case 22:return"STR";case 23:this.popState();break;case 24:this.pushState("string");break;case 25:return 84;case 26:return 102;case 27:return 85;case 28:return 104;case 29:return 86;case 30:return 87;case 31:return 97;case 32:this.begin("click");break;case 33:this.popState();break;case 34:return 88;case 35:return mt.lex.firstGraph()&&this.begin("dir"),12;break;case 36:return mt.lex.firstGraph()&&this.begin("dir"),12;break;case 37:return mt.lex.firstGraph()&&this.begin("dir"),12;break;case 38:return 27;case 39:return 32;case 40:return 98;case 41:return 98;case 42:return 98;case 43:return 98;case 44:return this.popState(),13;break;case 45:return this.popState(),14;break;case 46:return this.popState(),14;break;case 47:return this.popState(),14;break;case 48:return this.popState(),14;break;case 49:return this.popState(),14;break;case 50:return this.popState(),14;break;case 51:return this.popState(),14;break;case 52:return this.popState(),14;break;case 53:return this.popState(),14;break;case 54:return this.popState(),14;break;case 55:return 121;case 56:return 122;case 57:return 123;case 58:return 124;case 59:return 78;case 60:return 105;case 61:return 111;case 62:return 46;case 63:return 60;case 64:return 44;case 65:return 8;case 66:return 106;case 67:return 115;case 68:return this.popState(),77;break;case 69:return this.pushState("edgeText"),75;break;case 70:return 119;case 71:return this.popState(),77;break;case 72:return this.pushState("thickEdgeText"),75;break;case 73:return 119;case 74:return this.popState(),77;break;case 75:return this.pushState("dottedEdgeText"),75;break;case 76:return 119;case 77:return 77;case 78:return this.popState(),53;break;case 79:return"TEXT";case 80:return this.pushState("ellipseText"),52;break;case 81:return this.popState(),55;break;case 82:return this.pushState("text"),54;break;case 83:return this.popState(),57;break;case 84:return this.pushState("text"),56;break;case 85:return 58;case 86:return this.pushState("text"),67;break;case 87:return this.popState(),64;break;case 88:return this.pushState("text"),63;break;case 89:return this.popState(),49;break;case 90:return this.pushState("text"),48;break;case 91:return this.popState(),69;break;case 92:return this.popState(),71;break;case 93:return 117;case 94:return this.pushState("trapText"),68;break;case 95:return this.pushState("trapText"),70;break;case 96:return 118;case 97:return 67;case 98:return 90;case 99:return"SEP";case 100:return 89;case 101:return 115;case 102:return 111;case 103:return 44;case 104:return 109;case 105:return 114;case 106:return 116;case 107:return this.popState(),62;break;case 108:return this.pushState("text"),62;break;case 109:return this.popState(),51;break;case 110:return this.pushState("text"),50;break;case 111:return this.popState(),31;break;case 112:return this.pushState("text"),29;break;case 113:return this.popState(),66;break;case 114:return this.pushState("text"),65;break;case 115:return"TEXT";case 116:return"QUOTE";case 117:return 9;case 118:return 10;case 119:return 11}},"anonymous"),rules:[/^(?:accTitle\s*:\s*)/,/^(?:(?!\n||)*[^\n]*)/,/^(?:accDescr\s*:\s*)/,/^(?:(?!\n||)*[^\n]*)/,/^(?:accDescr\s*\{\s*)/,/^(?:[\}])/,/^(?:[^\}]*)/,/^(?:@\{)/,/^(?:["])/,/^(?:["])/,/^(?:[^\"]+)/,/^(?:[^}^"]+)/,/^(?:\})/,/^(?:call[\s]+)/,/^(?:\([\s]*\))/,/^(?:\()/,/^(?:[^(]*)/,/^(?:\))/,/^(?:[^)]*)/,/^(?:[^`"]+)/,/^(?:[`]["])/,/^(?:["][`])/,/^(?:[^"]+)/,/^(?:["])/,/^(?:["])/,/^(?:style\b)/,/^(?:default\b)/,/^(?:linkStyle\b)/,/^(?:interpolate\b)/,/^(?:classDef\b)/,/^(?:class\b)/,/^(?:href[\s])/,/^(?:click[\s]+)/,/^(?:[\s\n])/,/^(?:[^\s\n]*)/,/^(?:flowchart-elk\b)/,/^(?:graph\b)/,/^(?:flowchart\b)/,/^(?:subgraph\b)/,/^(?:end\b\s*)/,/^(?:_self\b)/,/^(?:_blank\b)/,/^(?:_parent\b)/,/^(?:_top\b)/,/^(?:(\r?\n)*\s*\n)/,/^(?:\s*LR\b)/,/^(?:\s*RL\b)/,/^(?:\s*TB\b)/,/^(?:\s*BT\b)/,/^(?:\s*TD\b)/,/^(?:\s*BR\b)/,/^(?:\s*<)/,/^(?:\s*>)/,/^(?:\s*\^)/,/^(?:\s*v\b)/,/^(?:.*direction\s+TB[^\n]*)/,/^(?:.*direction\s+BT[^\n]*)/,/^(?:.*direction\s+RL[^\n]*)/,/^(?:.*direction\s+LR[^\n]*)/,/^(?:[^\s\"]+@(?=[^\{\"]))/,/^(?:[0-9]+)/,/^(?:#)/,/^(?::::)/,/^(?::)/,/^(?:&)/,/^(?:;)/,/^(?:,)/,/^(?:\*)/,/^(?:\s*[xo<]?--+[-xo>]\s*)/,/^(?:\s*[xo<]?--\s*)/,/^(?:[^-]|-(?!-)+)/,/^(?:\s*[xo<]?==+[=xo>]\s*)/,/^(?:\s*[xo<]?==\s*)/,/^(?:[^=]|=(?!))/,/^(?:\s*[xo<]?-?\.+-[xo>]?\s*)/,/^(?:\s*[xo<]?-\.\s*)/,/^(?:[^\.]|\.(?!))/,/^(?:\s*~~[\~]+\s*)/,/^(?:[-/\)][\)])/,/^(?:[^\(\)\[\]\{\}]|!\)+)/,/^(?:\(-)/,/^(?:\]\))/,/^(?:\(\[)/,/^(?:\]\])/,/^(?:\[\[)/,/^(?:\[\|)/,/^(?:>)/,/^(?:\)\])/,/^(?:\[\()/,/^(?:\)\)\))/,/^(?:\(\(\()/,/^(?:[\\(?=\])][\]])/,/^(?:\/(?=\])\])/,/^(?:\/(?!\])|\\(?!\])|[^\\\[\]\(\)\{\}\/]+)/,/^(?:\[\/)/,/^(?:\[\\)/,/^(?:<)/,/^(?:>)/,/^(?:\^)/,/^(?:\\\|)/,/^(?:v\b)/,/^(?:\*)/,/^(?:#)/,/^(?:&)/,/^(?:([A-Za-z0-9!"\#$%&'*+\.`?\\_\/]|-(?=[^\>\-\.])|(?!))+)/,/^(?:-)/,/^(?:[\u00AA\u00B5\u00BA\u00C0-\u00D6\u00D8-\u00F6]|[\u00F8-\u02C1\u02C6-\u02D1\u02E0-\u02E4\u02EC\u02EE\u0370-\u0374\u0376\u0377]|[\u037A-\u037D\u0386\u0388-\u038A\u038C\u038E-\u03A1\u03A3-\u03F5]|[\u03F7-\u0481\u048A-\u0527\u0531-\u0556\u0559\u0561-\u0587\u05D0-\u05EA]|[\u05F0-\u05F2\u0620-\u064A\u066E\u066F\u0671-\u06D3\u06D5\u06E5\u06E6\u06EE]|[\u06EF\u06FA-\u06FC\u06FF\u0710\u0712-\u072F\u074D-\u07A5\u07B1\u07CA-\u07EA]|[\u07F4\u07F5\u07FA\u0800-\u0815\u081A\u0824\u0828\u0840-\u0858\u08A0]|[\u08A2-\u08AC\u0904-\u0939\u093D\u0950\u0958-\u0961\u0971-\u0977]|[\u0979-\u097F\u0985-\u098C\u098F\u0990\u0993-\u09A8\u09AA-\u09B0\u09B2]|[\u09B6-\u09B9\u09BD\u09CE\u09DC\u09DD\u09DF-\u09E1\u09F0\u09F1\u0A05-\u0A0A]|[\u0A0F\u0A10\u0A13-\u0A28\u0A2A-\u0A30\u0A32\u0A33\u0A35\u0A36\u0A38\u0A39]|[\u0A59-\u0A5C\u0A5E\u0A72-\u0A74\u0A85-\u0A8D\u0A8F-\u0A91\u0A93-\u0AA8]|[\u0AAA-\u0AB0\u0AB2\u0AB3\u0AB5-\u0AB9\u0ABD\u0AD0\u0AE0\u0AE1\u0B05-\u0B0C]|[\u0B0F\u0B10\u0B13-\u0B28\u0B2A-\u0B30\u0B32\u0B33\u0B35-\u0B39\u0B3D\u0B5C]|[\u0B5D\u0B5F-\u0B61\u0B71\u0B83\u0B85-\u0B8A\u0B8E-\u0B90\u0B92-\u0B95\u0B99]|[\u0B9A\u0B9C\u0B9E\u0B9F\u0BA3\u0BA4\u0BA8-\u0BAA\u0BAE-\u0BB9\u0BD0]|[\u0C05-\u0C0C\u0C0E-\u0C10\u0C12-\u0C28\u0C2A-\u0C33\u0C35-\u0C39\u0C3D]|[\u0C58\u0C59\u0C60\u0C61\u0C85-\u0C8C\u0C8E-\u0C90\u0C92-\u0CA8\u0CAA-\u0CB3]|[\u0CB5-\u0CB9\u0CBD\u0CDE\u0CE0\u0CE1\u0CF1\u0CF2\u0D05-\u0D0C\u0D0E-\u0D10]|[\u0D12-\u0D3A\u0D3D\u0D4E\u0D60\u0D61\u0D7A-\u0D7F\u0D85-\u0D96\u0D9A-\u0DB1]|[\u0DB3-\u0DBB\u0DBD\u0DC0-\u0DC6\u0E01-\u0E30\u0E32\u0E33\u0E40-\u0E46\u0E81]|[\u0E82\u0E84\u0E87\u0E88\u0E8A\u0E8D\u0E94-\u0E97\u0E99-\u0E9F\u0EA1-\u0EA3]|[\u0EA5\u0EA7\u0EAA\u0EAB\u0EAD-\u0EB0\u0EB2\u0EB3\u0EBD\u0EC0-\u0EC4\u0EC6]|[\u0EDC-\u0EDF\u0F00\u0F40-\u0F47\u0F49-\u0F6C\u0F88-\u0F8C\u1000-\u102A]|[\u103F\u1050-\u1055\u105A-\u105D\u1061\u1065\u1066\u106E-\u1070\u1075-\u1081]|[\u108E\u10A0-\u10C5\u10C7\u10CD\u10D0-\u10FA\u10FC-\u1248\u124A-\u124D]|[\u1250-\u1256\u1258\u125A-\u125D\u1260-\u1288\u128A-\u128D\u1290-\u12B0]|[\u12B2-\u12B5\u12B8-\u12BE\u12C0\u12C2-\u12C5\u12C8-\u12D6\u12D8-\u1310]|[\u1312-\u1315\u1318-\u135A\u1380-\u138F\u13A0-\u13F4\u1401-\u166C]|[\u166F-\u167F\u1681-\u169A\u16A0-\u16EA\u1700-\u170C\u170E-\u1711]|[\u1720-\u1731\u1740-\u1751\u1760-\u176C\u176E-\u1770\u1780-\u17B3\u17D7]|[\u17DC\u1820-\u1877\u1880-\u18A8\u18AA\u18B0-\u18F5\u1900-\u191C]|[\u1950-\u196D\u1970-\u1974\u1980-\u19AB\u19C1-\u19C7\u1A00-\u1A16]|[\u1A20-\u1A54\u1AA7\u1B05-\u1B33\u1B45-\u1B4B\u1B83-\u1BA0\u1BAE\u1BAF]|[\u1BBA-\u1BE5\u1C00-\u1C23\u1C4D-\u1C4F\u1C5A-\u1C7D\u1CE9-\u1CEC]|[\u1CEE-\u1CF1\u1CF5\u1CF6\u1D00-\u1DBF\u1E00-\u1F15\u1F18-\u1F1D]|[\u1F20-\u1F45\u1F48-\u1F4D\u1F50-\u1F57\u1F59\u1F5B\u1F5D\u1F5F-\u1F7D]|[\u1F80-\u1FB4\u1FB6-\u1FBC\u1FBE\u1FC2-\u1FC4\u1FC6-\u1FCC\u1FD0-\u1FD3]|[\u1FD6-\u1FDB\u1FE0-\u1FEC\u1FF2-\u1FF4\u1FF6-\u1FFC\u2071\u207F]|[\u2090-\u209C\u2102\u2107\u210A-\u2113\u2115\u2119-\u211D\u2124\u2126\u2128]|[\u212A-\u212D\u212F-\u2139\u213C-\u213F\u2145-\u2149\u214E\u2183\u2184]|[\u2C00-\u2C2E\u2C30-\u2C5E\u2C60-\u2CE4\u2CEB-\u2CEE\u2CF2\u2CF3]|[\u2D00-\u2D25\u2D27\u2D2D\u2D30-\u2D67\u2D6F\u2D80-\u2D96\u2DA0-\u2DA6]|[\u2DA8-\u2DAE\u2DB0-\u2DB6\u2DB8-\u2DBE\u2DC0-\u2DC6\u2DC8-\u2DCE]|[\u2DD0-\u2DD6\u2DD8-\u2DDE\u2E2F\u3005\u3006\u3031-\u3035\u303B\u303C]|[\u3041-\u3096\u309D-\u309F\u30A1-\u30FA\u30FC-\u30FF\u3105-\u312D]|[\u3131-\u318E\u31A0-\u31BA\u31F0-\u31FF\u3400-\u4DB5\u4E00-\u9FCC]|[\uA000-\uA48C\uA4D0-\uA4FD\uA500-\uA60C\uA610-\uA61F\uA62A\uA62B]|[\uA640-\uA66E\uA67F-\uA697\uA6A0-\uA6E5\uA717-\uA71F\uA722-\uA788]|[\uA78B-\uA78E\uA790-\uA793\uA7A0-\uA7AA\uA7F8-\uA801\uA803-\uA805]|[\uA807-\uA80A\uA80C-\uA822\uA840-\uA873\uA882-\uA8B3\uA8F2-\uA8F7\uA8FB]|[\uA90A-\uA925\uA930-\uA946\uA960-\uA97C\uA984-\uA9B2\uA9CF\uAA00-\uAA28]|[\uAA40-\uAA42\uAA44-\uAA4B\uAA60-\uAA76\uAA7A\uAA80-\uAAAF\uAAB1\uAAB5]|[\uAAB6\uAAB9-\uAABD\uAAC0\uAAC2\uAADB-\uAADD\uAAE0-\uAAEA\uAAF2-\uAAF4]|[\uAB01-\uAB06\uAB09-\uAB0E\uAB11-\uAB16\uAB20-\uAB26\uAB28-\uAB2E]|[\uABC0-\uABE2\uAC00-\uD7A3\uD7B0-\uD7C6\uD7CB-\uD7FB\uF900-\uFA6D]|[\uFA70-\uFAD9\uFB00-\uFB06\uFB13-\uFB17\uFB1D\uFB1F-\uFB28\uFB2A-\uFB36]|[\uFB38-\uFB3C\uFB3E\uFB40\uFB41\uFB43\uFB44\uFB46-\uFBB1\uFBD3-\uFD3D]|[\uFD50-\uFD8F\uFD92-\uFDC7\uFDF0-\uFDFB\uFE70-\uFE74\uFE76-\uFEFC]|[\uFF21-\uFF3A\uFF41-\uFF5A\uFF66-\uFFBE\uFFC2-\uFFC7\uFFCA-\uFFCF]|[\uFFD2-\uFFD7\uFFDA-\uFFDC])/,/^(?:\|)/,/^(?:\|)/,/^(?:\))/,/^(?:\()/,/^(?:\])/,/^(?:\[)/,/^(?:(\}))/,/^(?:\{)/,/^(?:[^\[\]\(\)\{\}\|\"]+)/,/^(?:")/,/^(?:(\r?\n)+)/,/^(?:\s)/,/^(?:$)/],conditions:{shapeDataEndBracket:{rules:[21,24,77,80,82,84,88,90,94,95,108,110,112,114],inclusive:!1},shapeDataStr:{rules:[9,10,21,24,77,80,82,84,88,90,94,95,108,110,112,114],inclusive:!1},shapeData:{rules:[8,11,12,21,24,77,80,82,84,88,90,94,95,108,110,112,114],inclusive:!1},callbackargs:{rules:[17,18,21,24,77,80,82,84,88,90,94,95,108,110,112,114],inclusive:!1},callbackname:{rules:[14,15,16,21,24,77,80,82,84,88,90,94,95,108,110,112,114],inclusive:!1},href:{rules:[21,24,77,80,82,84,88,90,94,95,108,110,112,114],inclusive:!1},click:{rules:[21,24,33,34,77,80,82,84,88,90,94,95,108,110,112,114],inclusive:!1},dottedEdgeText:{rules:[21,24,74,76,77,80,82,84,88,90,94,95,108,110,112,114],inclusive:!1},thickEdgeText:{rules:[21,24,71,73,77,80,82,84,88,90,94,95,108,110,112,114],inclusive:!1},edgeText:{rules:[21,24,68,70,77,80,82,84,88,90,94,95,108,110,112,114],inclusive:!1},trapText:{rules:[21,24,77,80,82,84,88,90,91,92,93,94,95,108,110,112,114],inclusive:!1},ellipseText:{rules:[21,24,77,78,79,80,82,84,88,90,94,95,108,110,112,114],inclusive:!1},text:{rules:[21,24,77,80,81,82,83,84,87,88,89,90,94,95,107,108,109,110,111,112,113,114,115],inclusive:!1},vertex:{rules:[21,24,77,80,82,84,88,90,94,95,108,110,112,114],inclusive:!1},dir:{rules:[21,24,44,45,46,47,48,49,50,51,52,53,54,77,80,82,84,88,90,94,95,108,110,112,114],inclusive:!1},acc_descr_multiline:{rules:[5,6,21,24,77,80,82,84,88,90,94,95,108,110,112,114],inclusive:!1},acc_descr:{rules:[3,21,24,77,80,82,84,88,90,94,95,108,110,112,114],inclusive:!1},acc_title:{rules:[1,21,24,77,80,82,84,88,90,94,95,108,110,112,114],inclusive:!1},md_string:{rules:[19,20,21,24,77,80,82,84,88,90,94,95,108,110,112,114],inclusive:!1},string:{rules:[21,22,23,24,77,80,82,84,88,90,94,95,108,110,112,114],inclusive:!1},INITIAL:{rules:[0,2,4,7,13,21,24,25,26,27,28,29,30,31,32,35,36,37,38,39,40,41,42,43,55,56,57,58,59,60,61,62,63,64,65,66,67,68,69,71,72,74,75,77,80,82,84,85,86,88,90,94,95,96,97,98,99,100,101,102,103,104,105,106,108,110,112,114,116,117,118,119],inclusive:!0}}};return Hr}();Mi.lexer=Zn;function Sn(){this.yy={}}return o(Sn,"Parser"),Sn.prototype=Mi,Mi.Parser=Sn,new Sn}();ER.parser=ER;SR=ER});var Xie,jie,Kie=N(()=>{"use strict";Yie();Xie=Object.assign({},SR);Xie.parse=t=>{let e=t.replace(/}\s*\n/g,`} +`);return SR.parse(e)};jie=Xie});var Lc,Ym=N(()=>{"use strict";Lc=o(()=>` + /* Font Awesome icon styling - consolidated */ + .label-icon { + display: inline-block; + height: 1em; + overflow: visible; + vertical-align: -0.125em; + } + + .node .label-icon path { + fill: currentColor; + stroke: revert; + stroke-width: revert; + } +`,"getIconStyles")});var hOe,fOe,Qie,Zie=N(()=>{"use strict";js();Ym();hOe=o((t,e)=>{let r=rd,n=r(t,"r"),i=r(t,"g"),a=r(t,"b");return qa(n,i,a,e)},"fade"),fOe=o(t=>`.label { font-family: ${t.fontFamily}; color: ${t.nodeTextColor||t.textColor}; } @@ -567,7 +581,7 @@ Expecting `+D4.join(", ")+", got '"+(this.terminals_[Wa]||Wa)+"'":kC="Parse erro /* For html labels only */ .labelBkg { - background-color: ${gOe(t.edgeLabelBackground,.5)}; + background-color: ${hOe(t.edgeLabelBackground,.5)}; // background-color: } @@ -626,12 +640,13 @@ Expecting `+D4.join(", ")+", got '"+(this.terminals_[Wa]||Wa)+"'":kC="Parse erro } text-align: center; } -`,"getStyles"),qie=yOe});var ik={};hr(ik,{diagram:()=>vOe});var vOe,ak=N(()=>{"use strict";zt();qZ();Gie();Wie();Yie();vOe={parser:Hie,get db(){return new Uw},renderer:zie,styles:qie,init:o(t=>{t.flowchart||(t.flowchart={}),t.layout&&Yy({layout:t.layout}),t.flowchart.arrowMarkerAbsolute=t.arrowMarkerAbsolute,Yy({flowchart:{arrowMarkerAbsolute:t.arrowMarkerAbsolute}})},"init")}});var wR,Zie,Jie=N(()=>{"use strict";wR=function(){var t=o(function(J,se,ue,Z){for(ue=ue||{},Z=J.length;Z--;ue[J[Z]]=se);return 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ge=ae.length-1;switch(ce){case 1:break;case 2:this.$=[];break;case 3:ae[ge-1].push(ae[ge]),this.$=ae[ge-1];break;case 4:case 5:this.$=ae[ge];break;case 6:case 7:this.$=[];break;case 8:Se.addEntity(ae[ge-4]),Se.addEntity(ae[ge-2]),Se.addRelationship(ae[ge-4],ae[ge],ae[ge-2],ae[ge-3]);break;case 9:Se.addEntity(ae[ge-8]),Se.addEntity(ae[ge-4]),Se.addRelationship(ae[ge-8],ae[ge],ae[ge-4],ae[ge-5]),Se.setClass([ae[ge-8]],ae[ge-6]),Se.setClass([ae[ge-4]],ae[ge-2]);break;case 10:Se.addEntity(ae[ge-6]),Se.addEntity(ae[ge-2]),Se.addRelationship(ae[ge-6],ae[ge],ae[ge-2],ae[ge-3]),Se.setClass([ae[ge-6]],ae[ge-4]);break;case 11:Se.addEntity(ae[ge-6]),Se.addEntity(ae[ge-4]),Se.addRelationship(ae[ge-6],ae[ge],ae[ge-4],ae[ge-5]),Se.setClass([ae[ge-4]],ae[ge-2]);break;case 12:Se.addEntity(ae[ge-3]),Se.addAttributes(ae[ge-3],ae[ge-1]);break;case 13:Se.addEntity(ae[ge-5]),Se.addAttributes(ae[ge-5],ae[ge-1]),Se.setClass([ae[ge-5]],ae[ge-3]);break;case 14:Se.addEntity(ae[ge-2]);break;case 15:Se.addEntity(ae[ge-4]),Se.setClass([ae[ge-4]],ae[ge-2]);break;case 16:Se.addEntity(ae[ge]);break;case 17:Se.addEntity(ae[ge-2]),Se.setClass([ae[ge-2]],ae[ge]);break;case 18:Se.addEntity(ae[ge-6],ae[ge-4]),Se.addAttributes(ae[ge-6],ae[ge-1]);break;case 19:Se.addEntity(ae[ge-8],ae[ge-6]),Se.addAttributes(ae[ge-8],ae[ge-1]),Se.setClass([ae[ge-8]],ae[ge-3]);break;case 20:Se.addEntity(ae[ge-5],ae[ge-3]);break;case 21:Se.addEntity(ae[ge-7],ae[ge-5]),Se.setClass([ae[ge-7]],ae[ge-2]);break;case 22:Se.addEntity(ae[ge-3],ae[ge-1]);break;case 23:Se.addEntity(ae[ge-5],ae[ge-3]),Se.setClass([ae[ge-5]],ae[ge]);break;case 24:case 25:this.$=ae[ge].trim(),Se.setAccTitle(this.$);break;case 26:case 27:this.$=ae[ge].trim(),Se.setAccDescription(this.$);break;case 32:Se.setDirection("TB");break;case 33:Se.setDirection("BT");break;case 34:Se.setDirection("RL");break;case 35:Se.setDirection("LR");break;case 36:this.$=ae[ge-3],Se.addClass(ae[ge-2],ae[ge-1]);break;case 37:case 38:case 56:case 64:this.$=[ae[ge]];break;case 39:case 40:this.$=ae[ge-2].concat([ae[ge]]);break;case 41:this.$=ae[ge-2],Se.setClass(ae[ge-1],ae[ge]);break;case 42:this.$=ae[ge-3],Se.addCssStyles(ae[ge-2],ae[ge-1]);break;case 43:this.$=[ae[ge]];break;case 44:ae[ge-2].push(ae[ge]),this.$=ae[ge-2];break;case 46:this.$=ae[ge-1]+ae[ge];break;case 54:case 76:case 77:this.$=ae[ge].replace(/"/g,"");break;case 55:case 78:this.$=ae[ge];break;case 57:ae[ge].push(ae[ge-1]),this.$=ae[ge];break;case 58:this.$={type:ae[ge-1],name:ae[ge]};break;case 59:this.$={type:ae[ge-2],name:ae[ge-1],keys:ae[ge]};break;case 60:this.$={type:ae[ge-2],name:ae[ge-1],comment:ae[ge]};break;case 61:this.$={type:ae[ge-3],name:ae[ge-2],keys:ae[ge-1],comment:ae[ge]};break;case 62:case 63:case 66:this.$=ae[ge];break;case 65:ae[ge-2].push(ae[ge]),this.$=ae[ge-2];break;case 67:this.$=ae[ge].replace(/"/g,"");break;case 68:this.$={cardA:ae[ge],relType:ae[ge-1],cardB:ae[ge-2]};break;case 69:this.$=Se.Cardinality.ZERO_OR_ONE;break;case 70:this.$=Se.Cardinality.ZERO_OR_MORE;break;case 71:this.$=Se.Cardinality.ONE_OR_MORE;break;case 72:this.$=Se.Cardinality.ONLY_ONE;break;case 73:this.$=Se.Cardinality.MD_PARENT;break;case 74:this.$=Se.Identification.NON_IDENTIFYING;break;case 75:this.$=Se.Identification.IDENTIFYING;break}},"anonymous"),table:[{3:1,4:[1,2]},{1:[3]},t(e,[2,2],{5:3}),{6:[1,4],7:5,8:[1,6],9:7,10:[1,8],11:9,22:r,24:n,26:i,28:a,29:14,30:15,31:16,32:17,33:s,34:l,35:u,36:h,37:f,40:d,43:p,44:m,50:g},t(e,[2,7],{1:[2,1]}),t(e,[2,3]),{9:27,11:9,22:r,24:n,26:i,28:a,29:14,30:15,31:16,32:17,33:s,34:l,35:u,36:h,37:f,40:d,43:p,44:m,50:g},t(e,[2,5]),t(e,[2,6]),t(e,[2,16],{12:28,61:32,15:[1,29],17:[1,30],20:[1,31],63:y,64:v,65:x,66:b,67:w}),{23:[1,38]},{25:[1,39]},{27:[1,40]},t(e,[2,27]),t(e,[2,28]),t(e,[2,29]),t(e,[2,30]),t(e,[2,31]),t(C,[2,54]),t(C,[2,55]),t(e,[2,32]),t(e,[2,33]),t(e,[2,34]),t(e,[2,35]),{16:41,40:T,41:E},{16:44,40:T,41:E},{16:45,40:T,41:E},t(e,[2,4]),{11:46,40:d,50:g},{16:47,40:T,41:E},{18:48,19:[1,49],51:50,52:51,56:A},{11:53,40:d,50:g},{62:54,68:[1,55],69:[1,56]},t(S,[2,69]),t(S,[2,70]),t(S,[2,71]),t(S,[2,72]),t(S,[2,73]),t(e,[2,24]),t(e,[2,25]),t(e,[2,26]),{13:_,38:57,41:I,42:D,45:59,46:60,48:k,49:L},t(R,[2,37]),t(R,[2,38]),{16:65,40:T,41:E,42:D},{13:_,38:66,41:I,42:D,45:59,46:60,48:k,49:L},{13:[1,67],15:[1,68]},t(e,[2,17],{61:32,12:69,17:[1,70],42:D,63:y,64:v,65:x,66:b,67:w}),{19:[1,71]},t(e,[2,14]),{18:72,19:[2,56],51:50,52:51,56:A},{53:73,56:[1,74]},{56:[2,62]},{21:[1,75]},{61:76,63:y,64:v,65:x,66:b,67:w},t(O,[2,74]),t(O,[2,75]),{6:M,10:B,39:77,42:F,47:P},{40:[1,82],41:[1,83]},t(z,[2,43],{46:84,13:_,41:I,48:k,49:L}),t($,[2,45]),t($,[2,50]),t($,[2,51]),t($,[2,52]),t($,[2,53]),t(e,[2,41],{42:D}),{6:M,10:B,39:85,42:F,47:P},{14:86,40:H,50:Q,70:j},{16:90,40:T,41:E},{11:91,40:d,50:g},{18:92,19:[1,93],51:50,52:51,56:A},t(e,[2,12]),{19:[2,57]},t(ie,[2,58],{54:94,55:95,57:96,59:ne,60:le}),t([19,56,59,60],[2,63]),t(e,[2,22],{15:[1,100],17:[1,99]}),t([40,50],[2,68]),t(e,[2,36]),{13:_,41:I,45:101,46:60,48:k,49:L},t(e,[2,47]),t(e,[2,48]),t(e,[2,49]),t(R,[2,39]),t(R,[2,40]),t($,[2,46]),t(e,[2,42]),t(e,[2,8]),t(e,[2,76]),t(e,[2,77]),t(e,[2,78]),{13:[1,102],42:D},{13:[1,104],15:[1,103]},{19:[1,105]},t(e,[2,15]),t(ie,[2,59],{55:106,58:[1,107],60:le}),t(ie,[2,60]),t(he,[2,64]),t(ie,[2,67]),t(he,[2,66]),{18:108,19:[1,109],51:50,52:51,56:A},{16:110,40:T,41:E},t(z,[2,44],{46:84,13:_,41:I,48:k,49:L}),{14:111,40:H,50:Q,70:j},{16:112,40:T,41:E},{14:113,40:H,50:Q,70:j},t(e,[2,13]),t(ie,[2,61]),{57:114,59:ne},{19:[1,115]},t(e,[2,20]),t(e,[2,23],{17:[1,116],42:D}),t(e,[2,11]),{13:[1,117],42:D},t(e,[2,10]),t(he,[2,65]),t(e,[2,18]),{18:118,19:[1,119],51:50,52:51,56:A},{14:120,40:H,50:Q,70:j},{19:[1,121]},t(e,[2,21]),t(e,[2,9]),t(e,[2,19])],defaultActions:{52:[2,62],72:[2,57]},parseError:o(function(se,ue){if(ue.recoverable)this.trace(se);else{var Z=new Error(se);throw Z.hash=ue,Z}},"parseError"),parse:o(function(se){var ue=this,Z=[0],Se=[],ce=[null],ae=[],Oe=this.table,ge="",ze=0,He=0,$e=0,Re=2,Ie=1,be=ae.slice.call(arguments,1),W=Object.create(this.lexer),de={yy:{}};for(var re in this.yy)Object.prototype.hasOwnProperty.call(this.yy,re)&&(de.yy[re]=this.yy[re]);W.setInput(se,de.yy),de.yy.lexer=W,de.yy.parser=this,typeof W.yylloc>"u"&&(W.yylloc={});var oe=W.yylloc;ae.push(oe);var V=W.options&&W.options.ranges;typeof de.yy.parseError=="function"?this.parseError=de.yy.parseError:this.parseError=Object.getPrototypeOf(this).parseError;function xe(ct){Z.length=Z.length-2*ct,ce.length=ce.length-ct,ae.length=ae.length-ct}o(xe,"popStack");function q(){var ct;return ct=Se.pop()||W.lex()||Ie,typeof ct!="number"&&(ct instanceof Array&&(Se=ct,ct=Se.pop()),ct=ue.symbols_[ct]||ct),ct}o(q,"lex");for(var pe,ve,Pe,_e,we,Ve,De={},qe,at,Rt,st;;){if(Pe=Z[Z.length-1],this.defaultActions[Pe]?_e=this.defaultActions[Pe]:((pe===null||typeof pe>"u")&&(pe=q()),_e=Oe[Pe]&&Oe[Pe][pe]),typeof _e>"u"||!_e.length||!_e[0]){var Ue="";st=[];for(qe in Oe[Pe])this.terminals_[qe]&&qe>Re&&st.push("'"+this.terminals_[qe]+"'");W.showPosition?Ue="Parse error on line "+(ze+1)+`: -`+W.showPosition()+` -Expecting `+st.join(", ")+", got '"+(this.terminals_[pe]||pe)+"'":Ue="Parse error on line "+(ze+1)+": Unexpected "+(pe==Ie?"end of input":"'"+(this.terminals_[pe]||pe)+"'"),this.parseError(Ue,{text:W.match,token:this.terminals_[pe]||pe,line:W.yylineno,loc:oe,expected:st})}if(_e[0]instanceof Array&&_e.length>1)throw new Error("Parse Error: multiple actions possible at state: "+Pe+", token: "+pe);switch(_e[0]){case 1:Z.push(pe),ce.push(W.yytext),ae.push(W.yylloc),Z.push(_e[1]),pe=null,ve?(pe=ve,ve=null):(He=W.yyleng,ge=W.yytext,ze=W.yylineno,oe=W.yylloc,$e>0&&$e--);break;case 2:if(at=this.productions_[_e[1]][1],De.$=ce[ce.length-at],De._$={first_line:ae[ae.length-(at||1)].first_line,last_line:ae[ae.length-1].last_line,first_column:ae[ae.length-(at||1)].first_column,last_column:ae[ae.length-1].last_column},V&&(De._$.range=[ae[ae.length-(at||1)].range[0],ae[ae.length-1].range[1]]),Ve=this.performAction.apply(De,[ge,He,ze,de.yy,_e[1],ce,ae].concat(be)),typeof Ve<"u")return Ve;at&&(Z=Z.slice(0,-1*at*2),ce=ce.slice(0,-1*at),ae=ae.slice(0,-1*at)),Z.push(this.productions_[_e[1]][0]),ce.push(De.$),ae.push(De._$),Rt=Oe[Z[Z.length-2]][Z[Z.length-1]],Z.push(Rt);break;case 3:return!0}}return!0},"parse")},X=function(){var J={EOF:1,parseError:o(function(ue,Z){if(this.yy.parser)this.yy.parser.parseError(ue,Z);else throw new Error(ue)},"parseError"),setInput:o(function(se,ue){return 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Se=this.match.split(/(?:\r\n?|\n)/g);this.match=this.match.substr(0,this.match.length-1),this.matched=this.matched.substr(0,this.matched.length-1),Z.length-1&&(this.yylineno-=Z.length-1);var ce=this.yylloc.range;return this.yylloc={first_line:this.yylloc.first_line,last_line:this.yylineno+1,first_column:this.yylloc.first_column,last_column:Z?(Z.length===Se.length?this.yylloc.first_column:0)+Se[Se.length-Z.length].length-Z[0].length:this.yylloc.first_column-ue},this.options.ranges&&(this.yylloc.range=[ce[0],ce[0]+this.yyleng-ue]),this.yyleng=this.yytext.length,this},"unput"),more:o(function(){return this._more=!0,this},"more"),reject:o(function(){if(this.options.backtrack_lexer)this._backtrack=!0;else return this.parseError("Lexical error on line "+(this.yylineno+1)+`. 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63;case 42:return 65;case 43:return 65;case 44:return 65;case 45:return 63;case 46:return 63;case 47:return 64;case 48:return 64;case 49:return 64;case 50:return 64;case 51:return 64;case 52:return 65;case 53:return 64;case 54:return 65;case 55:return 66;case 56:return 66;case 57:return 66;case 58:return 66;case 59:return 63;case 60:return 64;case 61:return 65;case 62:return 67;case 63:return 68;case 64:return 69;case 65:return 69;case 66:return 68;case 67:return 68;case 68:return 68;case 69:return 41;case 70:return 47;case 71:return 40;case 72:return 48;case 73:return Z.yytext[0];case 74:return 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s={id:$h(a.entityA,a.entityB,{prefix:"id",counter:i++}),type:"normal",curve:"basis",start:a.entityA,end:a.entityB,label:a.roleA,labelpos:"c",thickness:"normal",classes:"relationshipLine",arrowTypeStart:a.relSpec.cardB.toLowerCase(),arrowTypeEnd:a.relSpec.cardA.toLowerCase(),pattern:a.relSpec.relType=="IDENTIFYING"?"solid":"dashed",look:n.look};r.push(s)}return{nodes:e,edges:r,other:{},config:n,direction:"TB"}}}});var TR={};hr(TR,{draw:()=>SOe});var SOe,tae=N(()=>{"use strict";zt();vt();gm();Yd();$m();ir();dr();SOe=o(async function(t,e,r,n){Y.info("REF0:"),Y.info("Drawing er diagram (unified)",e);let{securityLevel:i,er:a,layout:s}=me(),l=n.db.getData(),u=yc(e,i);l.type=n.type,l.layoutAlgorithm=nf(s),l.config.flowchart.nodeSpacing=a?.nodeSpacing||140,l.config.flowchart.rankSpacing=a?.rankSpacing||80,l.direction=n.db.getDirection(),l.markers=["only_one","zero_or_one","one_or_more","zero_or_more"],l.diagramId=e,await Cc(l,u),l.layoutAlgorithm==="elk"&&u.select(".edges").lower();let h=u.selectAll('[id*="-background"]');Array.from(h).length>0&&h.each(function(){let d=Ge(this),m=d.attr("id").replace("-background",""),g=u.select(`#${CSS.escape(m)}`);if(!g.empty()){let y=g.attr("transform");d.attr("transform",y)}});let f=8;Gt.insertTitle(u,"erDiagramTitleText",a?.titleTopMargin??25,n.db.getDiagramTitle()),Ac(u,f,"erDiagram",a?.useMaxWidth??!0)},"draw")});var COe,AOe,rae,nae=N(()=>{"use strict";Ys();COe=o((t,e)=>{let r=Kf,n=r(t,"r"),i=r(t,"g"),a=r(t,"b");return qa(n,i,a,e)},"fade"),AOe=o(t=>` + ${Lc()} +`,"getStyles"),Qie=fOe});var hk={};hr(hk,{diagram:()=>dOe});var dOe,fk=N(()=>{"use strict";zt();QZ();qie();Kie();Zie();dOe={parser:jie,get db(){return new Kw},renderer:Wie,styles:Qie,init:o(t=>{t.flowchart||(t.flowchart={}),t.layout&&tv({layout:t.layout}),t.flowchart.arrowMarkerAbsolute=t.arrowMarkerAbsolute,tv({flowchart:{arrowMarkerAbsolute:t.arrowMarkerAbsolute}})},"init")}});var CR,nae,iae=N(()=>{"use strict";CR=function(){var 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ye=ae.length-1;switch(se){case 1:break;case 2:this.$=[];break;case 3:ae[ye-1].push(ae[ye]),this.$=ae[ye-1];break;case 4:case 5:this.$=ae[ye];break;case 6:case 7:this.$=[];break;case 8:Se.addEntity(ae[ye-4]),Se.addEntity(ae[ye-2]),Se.addRelationship(ae[ye-4],ae[ye],ae[ye-2],ae[ye-3]);break;case 9:Se.addEntity(ae[ye-8]),Se.addEntity(ae[ye-4]),Se.addRelationship(ae[ye-8],ae[ye],ae[ye-4],ae[ye-5]),Se.setClass([ae[ye-8]],ae[ye-6]),Se.setClass([ae[ye-4]],ae[ye-2]);break;case 10:Se.addEntity(ae[ye-6]),Se.addEntity(ae[ye-2]),Se.addRelationship(ae[ye-6],ae[ye],ae[ye-2],ae[ye-3]),Se.setClass([ae[ye-6]],ae[ye-4]);break;case 11:Se.addEntity(ae[ye-6]),Se.addEntity(ae[ye-4]),Se.addRelationship(ae[ye-6],ae[ye],ae[ye-4],ae[ye-5]),Se.setClass([ae[ye-4]],ae[ye-2]);break;case 12:Se.addEntity(ae[ye-3]),Se.addAttributes(ae[ye-3],ae[ye-1]);break;case 13:Se.addEntity(ae[ye-5]),Se.addAttributes(ae[ye-5],ae[ye-1]),Se.setClass([ae[ye-5]],ae[ye-3]);break;case 14:Se.addEntity(ae[ye-2]);break;case 15:Se.addEntity(ae[ye-4]),Se.setClass([ae[ye-4]],ae[ye-2]);break;case 16:Se.addEntity(ae[ye]);break;case 17:Se.addEntity(ae[ye-2]),Se.setClass([ae[ye-2]],ae[ye]);break;case 18:Se.addEntity(ae[ye-6],ae[ye-4]),Se.addAttributes(ae[ye-6],ae[ye-1]);break;case 19:Se.addEntity(ae[ye-8],ae[ye-6]),Se.addAttributes(ae[ye-8],ae[ye-1]),Se.setClass([ae[ye-8]],ae[ye-3]);break;case 20:Se.addEntity(ae[ye-5],ae[ye-3]);break;case 21:Se.addEntity(ae[ye-7],ae[ye-5]),Se.setClass([ae[ye-7]],ae[ye-2]);break;case 22:Se.addEntity(ae[ye-3],ae[ye-1]);break;case 23:Se.addEntity(ae[ye-5],ae[ye-3]),Se.setClass([ae[ye-5]],ae[ye]);break;case 24:case 25:this.$=ae[ye].trim(),Se.setAccTitle(this.$);break;case 26:case 27:this.$=ae[ye].trim(),Se.setAccDescription(this.$);break;case 32:Se.setDirection("TB");break;case 33:Se.setDirection("BT");break;case 34:Se.setDirection("RL");break;case 35:Se.setDirection("LR");break;case 36:this.$=ae[ye-3],Se.addClass(ae[ye-2],ae[ye-1]);break;case 37:case 38:case 56:case 64:this.$=[ae[ye]];break;case 39:case 40:this.$=ae[ye-2].concat([ae[ye]]);break;case 41:this.$=ae[ye-2],Se.setClass(ae[ye-1],ae[ye]);break;case 42:this.$=ae[ye-3],Se.addCssStyles(ae[ye-2],ae[ye-1]);break;case 43:this.$=[ae[ye]];break;case 44:ae[ye-2].push(ae[ye]),this.$=ae[ye-2];break;case 46:this.$=ae[ye-1]+ae[ye];break;case 54:case 76:case 77:this.$=ae[ye].replace(/"/g,"");break;case 55:case 78:this.$=ae[ye];break;case 57:ae[ye].push(ae[ye-1]),this.$=ae[ye];break;case 58:this.$={type:ae[ye-1],name:ae[ye]};break;case 59:this.$={type:ae[ye-2],name:ae[ye-1],keys:ae[ye]};break;case 60:this.$={type:ae[ye-2],name:ae[ye-1],comment:ae[ye]};break;case 61:this.$={type:ae[ye-3],name:ae[ye-2],keys:ae[ye-1],comment:ae[ye]};break;case 62:case 63:case 66:this.$=ae[ye];break;case 65:ae[ye-2].push(ae[ye]),this.$=ae[ye-2];break;case 67:this.$=ae[ye].replace(/"/g,"");break;case 68:this.$={cardA:ae[ye],relType:ae[ye-1],cardB:ae[ye-2]};break;case 69:this.$=Se.Cardinality.ZERO_OR_ONE;break;case 70:this.$=Se.Cardinality.ZERO_OR_MORE;break;case 71:this.$=Se.Cardinality.ONE_OR_MORE;break;case 72:this.$=Se.Cardinality.ONLY_ONE;break;case 73:this.$=Se.Cardinality.MD_PARENT;break;case 74:this.$=Se.Identification.NON_IDENTIFYING;break;case 75:this.$=Se.Identification.IDENTIFYING;break}},"anonymous"),table:[{3:1,4:[1,2]},{1:[3]},t(e,[2,2],{5:3}),{6:[1,4],7:5,8:[1,6],9:7,10:[1,8],11:9,22:r,24:n,26:i,28:a,29:14,30:15,31:16,32:17,33:s,34:l,35:u,36:h,37:f,40:d,43:p,44:m,50:g},t(e,[2,7],{1:[2,1]}),t(e,[2,3]),{9:27,11:9,22:r,24:n,26:i,28:a,29:14,30:15,31:16,32:17,33:s,34:l,35:u,36:h,37:f,40:d,43:p,44:m,50:g},t(e,[2,5]),t(e,[2,6]),t(e,[2,16],{12:28,61:32,15:[1,29],17:[1,30],20:[1,31],63:y,64:v,65:x,66:b,67:w}),{23:[1,38]},{25:[1,39]},{27:[1,40]},t(e,[2,27]),t(e,[2,28]),t(e,[2,29]),t(e,[2,30]),t(e,[2,31]),t(C,[2,54]),t(C,[2,55]),t(e,[2,32]),t(e,[2,33]),t(e,[2,34]),t(e,[2,35]),{16:41,40:T,41:E},{16:44,40:T,41:E},{16:45,40:T,41:E},t(e,[2,4]),{11:46,40:d,50:g},{16:47,40:T,41:E},{18:48,19:[1,49],51:50,52:51,56:A},{11:53,40:d,50:g},{62:54,68:[1,55],69:[1,56]},t(S,[2,69]),t(S,[2,70]),t(S,[2,71]),t(S,[2,72]),t(S,[2,73]),t(e,[2,24]),t(e,[2,25]),t(e,[2,26]),{13:_,38:57,41:I,42:L,45:59,46:60,48:k,49:D},t(R,[2,37]),t(R,[2,38]),{16:65,40:T,41:E,42:L},{13:_,38:66,41:I,42:L,45:59,46:60,48:k,49:D},{13:[1,67],15:[1,68]},t(e,[2,17],{61:32,12:69,17:[1,70],42:L,63:y,64:v,65:x,66:b,67:w}),{19:[1,71]},t(e,[2,14]),{18:72,19:[2,56],51:50,52:51,56:A},{53:73,56:[1,74]},{56:[2,62]},{21:[1,75]},{61:76,63:y,64:v,65:x,66:b,67:w},t(O,[2,74]),t(O,[2,75]),{6:M,10:P,39:77,42:B,47:F},{40:[1,82],41:[1,83]},t(z,[2,43],{46:84,13:_,41:I,48:k,49:D}),t($,[2,45]),t($,[2,50]),t($,[2,51]),t($,[2,52]),t($,[2,53]),t(e,[2,41],{42:L}),{6:M,10:P,39:85,42:B,47:F},{14:86,40:U,50:Q,70:te},{16:90,40:T,41:E},{11:91,40:d,50:g},{18:92,19:[1,93],51:50,52:51,56:A},t(e,[2,12]),{19:[2,57]},t(Y,[2,58],{54:94,55:95,57:96,59:he,60:Z}),t([19,56,59,60],[2,63]),t(e,[2,22],{15:[1,100],17:[1,99]}),t([40,50],[2,68]),t(e,[2,36]),{13:_,41:I,45:101,46:60,48:k,49:D},t(e,[2,47]),t(e,[2,48]),t(e,[2,49]),t(R,[2,39]),t(R,[2,40]),t($,[2,46]),t(e,[2,42]),t(e,[2,8]),t(e,[2,76]),t(e,[2,77]),t(e,[2,78]),{13:[1,102],42:L},{13:[1,104],15:[1,103]},{19:[1,105]},t(e,[2,15]),t(Y,[2,59],{55:106,58:[1,107],60:Z}),t(Y,[2,60]),t(ue,[2,64]),t(Y,[2,67]),t(ue,[2,66]),{18:108,19:[1,109],51:50,52:51,56:A},{16:110,40:T,41:E},t(z,[2,44],{46:84,13:_,41:I,48:k,49:D}),{14:111,40:U,50:Q,70:te},{16:112,40:T,41:E},{14:113,40:U,50:Q,70:te},t(e,[2,13]),t(Y,[2,61]),{57:114,59:he},{19:[1,115]},t(e,[2,20]),t(e,[2,23],{17:[1,116],42:L}),t(e,[2,11]),{13:[1,117],42:L},t(e,[2,10]),t(ue,[2,65]),t(e,[2,18]),{18:118,19:[1,119],51:50,52:51,56:A},{14:120,40:U,50:Q,70:te},{19:[1,121]},t(e,[2,21]),t(e,[2,9]),t(e,[2,19])],defaultActions:{52:[2,62],72:[2,57]},parseError:o(function(ce,le){if(le.recoverable)this.trace(ce);else{var J=new Error(ce);throw J.hash=le,J}},"parseError"),parse:o(function(ce){var le=this,J=[0],Se=[],se=[null],ae=[],Oe=this.table,ye="",Be=0,He=0,ze=0,Le=2,Ie=1,xe=ae.slice.call(arguments,1),q=Object.create(this.lexer),de={yy:{}};for(var ie in this.yy)Object.prototype.hasOwnProperty.call(this.yy,ie)&&(de.yy[ie]=this.yy[ie]);q.setInput(ce,de.yy),de.yy.lexer=q,de.yy.parser=this,typeof q.yylloc>"u"&&(q.yylloc={});var oe=q.yylloc;ae.push(oe);var V=q.options&&q.options.ranges;typeof de.yy.parseError=="function"?this.parseError=de.yy.parseError:this.parseError=Object.getPrototypeOf(this).parseError;function we(ct){J.length=J.length-2*ct,se.length=se.length-ct,ae.length=ae.length-ct}o(we,"popStack");function W(){var ct;return ct=Se.pop()||q.lex()||Ie,typeof ct!="number"&&(ct instanceof Array&&(Se=ct,ct=Se.pop()),ct=le.symbols_[ct]||ct),ct}o(W,"lex");for(var pe,ve,Pe,_e,be,Ve,De={},qe,at,Lt,st;;){if(Pe=J[J.length-1],this.defaultActions[Pe]?_e=this.defaultActions[Pe]:((pe===null||typeof pe>"u")&&(pe=W()),_e=Oe[Pe]&&Oe[Pe][pe]),typeof _e>"u"||!_e.length||!_e[0]){var Ue="";st=[];for(qe in Oe[Pe])this.terminals_[qe]&&qe>Le&&st.push("'"+this.terminals_[qe]+"'");q.showPosition?Ue="Parse error on line "+(Be+1)+`: +`+q.showPosition()+` +Expecting `+st.join(", ")+", got '"+(this.terminals_[pe]||pe)+"'":Ue="Parse error on line "+(Be+1)+": Unexpected "+(pe==Ie?"end of input":"'"+(this.terminals_[pe]||pe)+"'"),this.parseError(Ue,{text:q.match,token:this.terminals_[pe]||pe,line:q.yylineno,loc:oe,expected:st})}if(_e[0]instanceof Array&&_e.length>1)throw new Error("Parse Error: multiple actions possible at state: "+Pe+", token: "+pe);switch(_e[0]){case 1:J.push(pe),se.push(q.yytext),ae.push(q.yylloc),J.push(_e[1]),pe=null,ve?(pe=ve,ve=null):(He=q.yyleng,ye=q.yytext,Be=q.yylineno,oe=q.yylloc,ze>0&&ze--);break;case 2:if(at=this.productions_[_e[1]][1],De.$=se[se.length-at],De._$={first_line:ae[ae.length-(at||1)].first_line,last_line:ae[ae.length-1].last_line,first_column:ae[ae.length-(at||1)].first_column,last_column:ae[ae.length-1].last_column},V&&(De._$.range=[ae[ae.length-(at||1)].range[0],ae[ae.length-1].range[1]]),Ve=this.performAction.apply(De,[ye,He,Be,de.yy,_e[1],se,ae].concat(xe)),typeof Ve<"u")return Ve;at&&(J=J.slice(0,-1*at*2),se=se.slice(0,-1*at),ae=ae.slice(0,-1*at)),J.push(this.productions_[_e[1]][0]),se.push(De.$),ae.push(De._$),Lt=Oe[J[J.length-2]][J[J.length-1]],J.push(Lt);break;case 3:return!0}}return!0},"parse")},j=function(){var ee={EOF:1,parseError:o(function(le,J){if(this.yy.parser)this.yy.parser.parseError(le,J);else throw new Error(le)},"parseError"),setInput:o(function(ce,le){return this.yy=le||this.yy||{},this._input=ce,this._more=this._backtrack=this.done=!1,this.yylineno=this.yyleng=0,this.yytext=this.matched=this.match="",this.conditionStack=["INITIAL"],this.yylloc={first_line:1,first_column:0,last_line:1,last_column:0},this.options.ranges&&(this.yylloc.range=[0,0]),this.offset=0,this},"setInput"),input:o(function(){var ce=this._input[0];this.yytext+=ce,this.yyleng++,this.offset++,this.match+=ce,this.matched+=ce;var le=ce.match(/(?:\r\n?|\n).*/g);return le?(this.yylineno++,this.yylloc.last_line++):this.yylloc.last_column++,this.options.ranges&&this.yylloc.range[1]++,this._input=this._input.slice(1),ce},"input"),unput:o(function(ce){var le=ce.length,J=ce.split(/(?:\r\n?|\n)/g);this._input=ce+this._input,this.yytext=this.yytext.substr(0,this.yytext.length-le),this.offset-=le;var Se=this.match.split(/(?:\r\n?|\n)/g);this.match=this.match.substr(0,this.match.length-1),this.matched=this.matched.substr(0,this.matched.length-1),J.length-1&&(this.yylineno-=J.length-1);var se=this.yylloc.range;return this.yylloc={first_line:this.yylloc.first_line,last_line:this.yylineno+1,first_column:this.yylloc.first_column,last_column:J?(J.length===Se.length?this.yylloc.first_column:0)+Se[Se.length-J.length].length-J[0].length:this.yylloc.first_column-le},this.options.ranges&&(this.yylloc.range=[se[0],se[0]+this.yyleng-le]),this.yyleng=this.yytext.length,this},"unput"),more:o(function(){return this._more=!0,this},"more"),reject:o(function(){if(this.options.backtrack_lexer)this._backtrack=!0;else return this.parseError("Lexical error on line "+(this.yylineno+1)+`. You can only invoke reject() in the lexer when the lexer is of the backtracking persuasion (options.backtrack_lexer = true). +`+this.showPosition(),{text:"",token:null,line:this.yylineno});return this},"reject"),less:o(function(ce){this.unput(this.match.slice(ce))},"less"),pastInput:o(function(){var ce=this.matched.substr(0,this.matched.length-this.match.length);return(ce.length>20?"...":"")+ce.substr(-20).replace(/\n/g,"")},"pastInput"),upcomingInput:o(function(){var ce=this.match;return ce.length<20&&(ce+=this._input.substr(0,20-ce.length)),(ce.substr(0,20)+(ce.length>20?"...":"")).replace(/\n/g,"")},"upcomingInput"),showPosition:o(function(){var ce=this.pastInput(),le=new Array(ce.length+1).join("-");return ce+this.upcomingInput()+` +`+le+"^"},"showPosition"),test_match:o(function(ce,le){var J,Se,se;if(this.options.backtrack_lexer&&(se={yylineno:this.yylineno,yylloc:{first_line:this.yylloc.first_line,last_line:this.last_line,first_column:this.yylloc.first_column,last_column:this.yylloc.last_column},yytext:this.yytext,match:this.match,matches:this.matches,matched:this.matched,yyleng:this.yyleng,offset:this.offset,_more:this._more,_input:this._input,yy:this.yy,conditionStack:this.conditionStack.slice(0),done:this.done},this.options.ranges&&(se.yylloc.range=this.yylloc.range.slice(0))),Se=ce[0].match(/(?:\r\n?|\n).*/g),Se&&(this.yylineno+=Se.length),this.yylloc={first_line:this.yylloc.last_line,last_line:this.yylineno+1,first_column:this.yylloc.last_column,last_column:Se?Se[Se.length-1].length-Se[Se.length-1].match(/\r?\n?/)[0].length:this.yylloc.last_column+ce[0].length},this.yytext+=ce[0],this.match+=ce[0],this.matches=ce,this.yyleng=this.yytext.length,this.options.ranges&&(this.yylloc.range=[this.offset,this.offset+=this.yyleng]),this._more=!1,this._backtrack=!1,this._input=this._input.slice(ce[0].length),this.matched+=ce[0],J=this.performAction.call(this,this.yy,this,le,this.conditionStack[this.conditionStack.length-1]),this.done&&this._input&&(this.done=!1),J)return J;if(this._backtrack){for(var ae in se)this[ae]=se[ae];return!1}return!1},"test_match"),next:o(function(){if(this.done)return this.EOF;this._input||(this.done=!0);var ce,le,J,Se;this._more||(this.yytext="",this.match="");for(var se=this._currentRules(),ae=0;aele[0].length)){if(le=J,Se=ae,this.options.backtrack_lexer){if(ce=this.test_match(J,se[ae]),ce!==!1)return ce;if(this._backtrack){le=!1;continue}else return!1}else if(!this.options.flex)break}return le?(ce=this.test_match(le,se[Se]),ce!==!1?ce:!1):this._input===""?this.EOF:this.parseError("Lexical error on line "+(this.yylineno+1)+`. Unrecognized text. +`+this.showPosition(),{text:"",token:null,line:this.yylineno})},"next"),lex:o(function(){var le=this.next();return le||this.lex()},"lex"),begin:o(function(le){this.conditionStack.push(le)},"begin"),popState:o(function(){var le=this.conditionStack.length-1;return le>0?this.conditionStack.pop():this.conditionStack[0]},"popState"),_currentRules:o(function(){return this.conditionStack.length&&this.conditionStack[this.conditionStack.length-1]?this.conditions[this.conditionStack[this.conditionStack.length-1]].rules:this.conditions.INITIAL.rules},"_currentRules"),topState:o(function(le){return le=this.conditionStack.length-1-Math.abs(le||0),le>=0?this.conditionStack[le]:"INITIAL"},"topState"),pushState:o(function(le){this.begin(le)},"pushState"),stateStackSize:o(function(){return this.conditionStack.length},"stateStackSize"),options:{"case-insensitive":!0},performAction:o(function(le,J,Se,se){var ae=se;switch(Se){case 0:return this.begin("acc_title"),24;break;case 1:return this.popState(),"acc_title_value";break;case 2:return this.begin("acc_descr"),26;break;case 3:return this.popState(),"acc_descr_value";break;case 4:this.begin("acc_descr_multiline");break;case 5:this.popState();break;case 6:return"acc_descr_multiline_value";case 7:return 33;case 8:return 34;case 9:return 35;case 10:return 36;case 11:return 10;case 12:break;case 13:return 8;case 14:return 50;case 15:return 70;case 16:return 4;case 17:return this.begin("block"),17;break;case 18:return 49;case 19:return 49;case 20:return 42;case 21:return 15;case 22:return 13;case 23:break;case 24:return 59;case 25:return 56;case 26:return 56;case 27:return 60;case 28:break;case 29:return this.popState(),19;break;case 30:return J.yytext[0];case 31:return 20;case 32:return 21;case 33:return this.begin("style"),44;break;case 34:return this.popState(),10;break;case 35:break;case 36:return 13;case 37:return 42;case 38:return 49;case 39:return this.begin("style"),37;break;case 40:return 43;case 41:return 63;case 42:return 65;case 43:return 65;case 44:return 65;case 45:return 63;case 46:return 63;case 47:return 64;case 48:return 64;case 49:return 64;case 50:return 64;case 51:return 64;case 52:return 65;case 53:return 64;case 54:return 65;case 55:return 66;case 56:return 66;case 57:return 66;case 58:return 66;case 59:return 63;case 60:return 64;case 61:return 65;case 62:return 67;case 63:return 68;case 64:return 69;case 65:return 69;case 66:return 68;case 67:return 68;case 68:return 68;case 69:return 41;case 70:return 47;case 71:return 40;case 72:return 48;case 73:return J.yytext[0];case 74:return 6}},"anonymous"),rules:[/^(?:accTitle\s*:\s*)/i,/^(?:(?!\n||)*[^\n]*)/i,/^(?:accDescr\s*:\s*)/i,/^(?:(?!\n||)*[^\n]*)/i,/^(?:accDescr\s*\{\s*)/i,/^(?:[\}])/i,/^(?:[^\}]*)/i,/^(?:.*direction\s+TB[^\n]*)/i,/^(?:.*direction\s+BT[^\n]*)/i,/^(?:.*direction\s+RL[^\n]*)/i,/^(?:.*direction\s+LR[^\n]*)/i,/^(?:[\n]+)/i,/^(?:\s+)/i,/^(?:[\s]+)/i,/^(?:"[^"%\r\n\v\b\\]+")/i,/^(?:"[^"]*")/i,/^(?:erDiagram\b)/i,/^(?:\{)/i,/^(?:#)/i,/^(?:#)/i,/^(?:,)/i,/^(?::::)/i,/^(?::)/i,/^(?:\s+)/i,/^(?:\b((?:PK)|(?:FK)|(?:UK))\b)/i,/^(?:([^\s]*)[~].*[~]([^\s]*))/i,/^(?:([\*A-Za-z_\u00C0-\uFFFF][A-Za-z0-9\-\_\[\]\(\)\u00C0-\uFFFF\*]*))/i,/^(?:"[^"]*")/i,/^(?:[\n]+)/i,/^(?:\})/i,/^(?:.)/i,/^(?:\[)/i,/^(?:\])/i,/^(?:style\b)/i,/^(?:[\n]+)/i,/^(?:\s+)/i,/^(?::)/i,/^(?:,)/i,/^(?:#)/i,/^(?:classDef\b)/i,/^(?:class\b)/i,/^(?:one or zero\b)/i,/^(?:one or more\b)/i,/^(?:one or many\b)/i,/^(?:1\+)/i,/^(?:\|o\b)/i,/^(?:zero or one\b)/i,/^(?:zero or more\b)/i,/^(?:zero or 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Mode:<${a}> at index: <${l}> +`,type:Yn.LEXER_DEFINITION_CANNOT_CONTAIN_UNDEFINED});else if(Bt(s,"LONGER_ALT")){let u=Pt(s.LONGER_ALT)?s.LONGER_ALT:[s.LONGER_ALT];Ae(u,h=>{!mr(h)&&!qn(i,h)&&n.push({message:`A MultiMode Lexer cannot be initialized with a longer_alt <${h.name}> on token <${s.name}> outside of mode <${a}> +`,type:Yn.MULTI_MODE_LEXER_LONGER_ALT_NOT_IN_CURRENT_MODE})})}})}),n}function Qae(t,e,r){let n=[],i=!1,a=Ec(qr(br(t.modes))),s=nf(a,u=>u[mp]===Xn.NA),l=rse(r);return e&&Ae(s,u=>{let h=tse(u,l);if(h!==!1){let d={message:OPe(u,h),type:h.issue,tokenType:u};n.push(d)}else Bt(u,"LINE_BREAKS")?u.LINE_BREAKS===!0&&(i=!0):$k(l,u.PATTERN)&&(i=!0)}),e&&!i&&n.push({message:`Warning: No LINE_BREAKS Found. This Lexer has been defined to track line and column information, But none of the Token Types can be identified as matching a line terminator. See https://chevrotain.io/docs/guide/resolving_lexer_errors.html#LINE_BREAKS - for details.`,type:Yn.NO_LINE_BREAKS_FLAGS}),n}function Yae(t){let e={},r=zr(t);return Ae(r,n=>{let i=t[n];if(Pt(i))e[n]=[];else throw Error("non exhaustive match")}),e}function Xae(t){let e=t.PATTERN;if(zo(e))return!1;if(Si(e))return!0;if(Bt(e,"exec"))return!0;if(yi(e))return!1;throw Error("non exhaustive match")}function $Pe(t){return yi(t)&&t.length===1?t.charCodeAt(0):!1}function Kae(t,e){if(Bt(t,"LINE_BREAKS"))return!1;if(zo(t.PATTERN)){try{Nk(e,t.PATTERN)}catch(r){return{issue:Yn.IDENTIFY_TERMINATOR,errMsg:r.message}}return!1}else{if(yi(t.PATTERN))return!1;if(Xae(t))return{issue:Yn.CUSTOM_LINE_BREAK};throw Error("non exhaustive match")}}function zPe(t,e){if(e.issue===Yn.IDENTIFY_TERMINATOR)return`Warning: unable to identify line terminator usage in pattern. + for details.`,type:Yn.NO_LINE_BREAKS_FLAGS}),n}function Zae(t){let e={},r=zr(t);return Ae(r,n=>{let i=t[n];if(Pt(i))e[n]=[];else throw Error("non exhaustive match")}),e}function Jae(t){let e=t.PATTERN;if(Go(e))return!1;if(Ci(e))return!0;if(Bt(e,"exec"))return!0;if(xi(e))return!1;throw Error("non exhaustive match")}function IPe(t){return xi(t)&&t.length===1?t.charCodeAt(0):!1}function tse(t,e){if(Bt(t,"LINE_BREAKS"))return!1;if(Go(t.PATTERN)){try{$k(e,t.PATTERN)}catch(r){return{issue:Yn.IDENTIFY_TERMINATOR,errMsg:r.message}}return!1}else{if(xi(t.PATTERN))return!1;if(Jae(t))return{issue:Yn.CUSTOM_LINE_BREAK};throw Error("non exhaustive match")}}function OPe(t,e){if(e.issue===Yn.IDENTIFY_TERMINATOR)return`Warning: unable to identify line terminator usage in pattern. The problem is in the <${t.name}> Token Type Root cause: ${e.errMsg}. For details See: https://chevrotain.io/docs/guide/resolving_lexer_errors.html#IDENTIFY_TERMINATOR`;if(e.issue===Yn.CUSTOM_LINE_BREAK)return`Warning: A Custom Token Pattern should specify the option. The problem is in the <${t.name}> Token Type - For details See: https://chevrotain.io/docs/guide/resolving_lexer_errors.html#CUSTOM_LINE_BREAK`;throw Error("non exhaustive match")}function Qae(t){return Je(t,r=>yi(r)?r.charCodeAt(0):r)}function CN(t,e,r){t[e]===void 0?t[e]=[r]:t[e].push(r)}function Ic(t){return t255?255+~~(t/255):t}}var lp,$g,Mk,AN,APe,LPe,jae,Fg,Ik,SN=N(()=>{"use strict";j2();ix();qt();Og();zae();Lk();lp="PATTERN",$g="defaultMode",Mk="modes",AN=typeof new RegExp("(?:)").sticky=="boolean";o(Uae,"analyzeTokenTypes");o(Hae,"validatePatterns");o(EPe,"validateRegExpPattern");o(SPe,"findMissingPatterns");o(CPe,"findInvalidPatterns");APe=/[^\\][$]/;o(_Pe,"findEndOfInputAnchor");o(DPe,"findEmptyMatchRegExps");LPe=/[^\\[][\^]|^\^/;o(RPe,"findStartOfInputAnchor");o(NPe,"findUnsupportedFlags");o(MPe,"findDuplicatePatterns");o(IPe,"findInvalidGroupType");o(OPe,"findModesThatDoNotExist");o(PPe,"findUnreachablePatterns");o(BPe,"testTokenType");o(FPe,"noMetaChar");o(Gae,"addStartOfInput");o(Vae,"addStickyFlag");o(Wae,"performRuntimeChecks");o(qae,"performWarningRuntimeChecks");o(Yae,"cloneEmptyGroups");o(Xae,"isCustomPattern");o($Pe,"isShortPattern");jae={test:o(function(t){let e=t.length;for(let r=this.lastIndex;r{r.isParent=r.categoryMatches.length>0})}function VPe(t){let e=an(t),r=t,n=!0;for(;n;){r=Tc(qr(Je(r,a=>a.CATEGORIES)));let i=Zh(r,e);e=e.concat(i),ur(i)?n=!1:r=i}return e}function UPe(t){Ae(t,e=>{_N(e)||(ese[Zae]=e,e.tokenTypeIdx=Zae++),Jae(e)&&!Pt(e.CATEGORIES)&&(e.CATEGORIES=[e.CATEGORIES]),Jae(e)||(e.CATEGORIES=[]),qPe(e)||(e.categoryMatches=[]),YPe(e)||(e.categoryMatchesMap={})})}function HPe(t){Ae(t,e=>{e.categoryMatches=[],Ae(e.categoryMatchesMap,(r,n)=>{e.categoryMatches.push(ese[n].tokenTypeIdx)})})}function WPe(t){Ae(t,e=>{tse([],e)})}function tse(t,e){Ae(t,r=>{e.categoryMatchesMap[r.tokenTypeIdx]=!0}),Ae(e.CATEGORIES,r=>{let n=t.concat(e);qn(n,r)||tse(n,r)})}function _N(t){return Bt(t,"tokenTypeIdx")}function Jae(t){return Bt(t,"CATEGORIES")}function qPe(t){return Bt(t,"categoryMatches")}function YPe(t){return Bt(t,"categoryMatchesMap")}function rse(t){return Bt(t,"tokenTypeIdx")}var Zae,ese,cp=N(()=>{"use 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strict";SN();qt();Og();cp();DN();Lk();(function(t){t[t.MISSING_PATTERN=0]="MISSING_PATTERN",t[t.INVALID_PATTERN=1]="INVALID_PATTERN",t[t.EOI_ANCHOR_FOUND=2]="EOI_ANCHOR_FOUND",t[t.UNSUPPORTED_FLAGS_FOUND=3]="UNSUPPORTED_FLAGS_FOUND",t[t.DUPLICATE_PATTERNS_FOUND=4]="DUPLICATE_PATTERNS_FOUND",t[t.INVALID_GROUP_TYPE_FOUND=5]="INVALID_GROUP_TYPE_FOUND",t[t.PUSH_MODE_DOES_NOT_EXIST=6]="PUSH_MODE_DOES_NOT_EXIST",t[t.MULTI_MODE_LEXER_WITHOUT_DEFAULT_MODE=7]="MULTI_MODE_LEXER_WITHOUT_DEFAULT_MODE",t[t.MULTI_MODE_LEXER_WITHOUT_MODES_PROPERTY=8]="MULTI_MODE_LEXER_WITHOUT_MODES_PROPERTY",t[t.MULTI_MODE_LEXER_DEFAULT_MODE_VALUE_DOES_NOT_EXIST=9]="MULTI_MODE_LEXER_DEFAULT_MODE_VALUE_DOES_NOT_EXIST",t[t.LEXER_DEFINITION_CANNOT_CONTAIN_UNDEFINED=10]="LEXER_DEFINITION_CANNOT_CONTAIN_UNDEFINED",t[t.SOI_ANCHOR_FOUND=11]="SOI_ANCHOR_FOUND",t[t.EMPTY_MATCH_PATTERN=12]="EMPTY_MATCH_PATTERN",t[t.NO_LINE_BREAKS_FLAGS=13]="NO_LINE_BREAKS_FLAGS",t[t.UNREACHABLE_PATTERN=14]="UNREACHABLE_PATTERN",t[t.IDENTIFY_TERMINATOR=15]="IDENTIFY_TERMINATOR",t[t.CUSTOM_LINE_BREAK=16]="CUSTOM_LINE_BREAK",t[t.MULTI_MODE_LEXER_LONGER_ALT_NOT_IN_CURRENT_MODE=17]="MULTI_MODE_LEXER_LONGER_ALT_NOT_IN_CURRENT_MODE"})(Yn||(Yn={}));ax={deferDefinitionErrorsHandling:!1,positionTracking:"full",lineTerminatorsPattern:/\n|\r\n?/g,lineTerminatorCharacters:[` 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n=this.config.traceInitPerf;n===!0?(this.traceInitMaxIdent=1/0,this.traceInitPerf=!0):typeof n=="number"&&(this.traceInitMaxIdent=n,this.traceInitPerf=!0),this.traceInitIndent=-1,this.TRACE_INIT("Lexer Constructor",()=>{let i,a=!0;this.TRACE_INIT("Lexer Config handling",()=>{if(this.config.lineTerminatorsPattern===ax.lineTerminatorsPattern)this.config.lineTerminatorsPattern=jae;else if(this.config.lineTerminatorCharacters===ax.lineTerminatorCharacters)throw Error(`Error: Missing property on the Lexer config. - For details See: https://chevrotain.io/docs/guide/resolving_lexer_errors.html#MISSING_LINE_TERM_CHARS`);if(r.safeMode&&r.ensureOptimizations)throw Error('"safeMode" and "ensureOptimizations" flags are mutually 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h;this.TRACE_INIT("analyzeTokenTypes",()=>{h=Uae(l,{lineTerminatorCharacters:this.config.lineTerminatorCharacters,positionTracking:r.positionTracking,ensureOptimizations:r.ensureOptimizations,safeMode:r.safeMode,tracer:this.TRACE_INIT})}),this.patternIdxToConfig[u]=h.patternIdxToConfig,this.charCodeToPatternIdxToConfig[u]=h.charCodeToPatternIdxToConfig,this.emptyGroups=ma({},this.emptyGroups,h.emptyGroups),this.hasCustom=h.hasCustom||this.hasCustom,this.canModeBeOptimized[u]=h.canBeOptimized}})}),this.defaultMode=i.defaultMode,!ur(this.lexerDefinitionErrors)&&!this.config.deferDefinitionErrorsHandling){let u=Je(this.lexerDefinitionErrors,h=>h.message).join(`----------------------- + For details See: https://chevrotain.io/docs/guide/resolving_lexer_errors.html#CUSTOM_LINE_BREAK`;throw Error("non exhaustive match")}function rse(t){return Je(t,r=>xi(r)?r.charCodeAt(0):r)}function RN(t,e,r){t[e]===void 0?t[e]=[r]:t[e].push(r)}function Bc(t){return t255?255+~~(t/255):t}}var mp,Yg,zk,NN,TPe,SPe,ese,qg,Gk,LN=N(()=>{"use strict";rx();hx();qt();Ug();Wae();Bk();mp="PATTERN",Yg="defaultMode",zk="modes",NN=typeof new RegExp("(?:)").sticky=="boolean";o(Xae,"analyzeTokenTypes");o(jae,"validatePatterns");o(xPe,"validateRegExpPattern");o(bPe,"findMissingPatterns");o(wPe,"findInvalidPatterns");TPe=/[^\\][$]/;o(kPe,"findEndOfInputAnchor");o(EPe,"findEmptyMatchRegExps");SPe=/[^\\[][\^]|^\^/;o(CPe,"findStartOfInputAnchor");o(APe,"findUnsupportedFlags");o(_Pe,"findDuplicatePatterns");o(DPe,"findInvalidGroupType");o(LPe,"findModesThatDoNotExist");o(RPe,"findUnreachablePatterns");o(NPe,"testTokenType");o(MPe,"noMetaChar");o(qae,"addStartOfInput");o(Yae,"addStickyFlag");o(Kae,"performRuntimeChecks");o(Qae,"performWarningRuntimeChecks");o(Zae,"cloneEmptyGroups");o(Jae,"isCustomPattern");o(IPe,"isShortPattern");ese={test:o(function(t){let e=t.length;for(let r=this.lastIndex;r{r.isParent=r.categoryMatches.length>0})}function BPe(t){let 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n=this.config.traceInitPerf;n===!0?(this.traceInitMaxIdent=1/0,this.traceInitPerf=!0):typeof n=="number"&&(this.traceInitMaxIdent=n,this.traceInitPerf=!0),this.traceInitIndent=-1,this.TRACE_INIT("Lexer Constructor",()=>{let i,a=!0;this.TRACE_INIT("Lexer Config handling",()=>{if(this.config.lineTerminatorsPattern===fx.lineTerminatorsPattern)this.config.lineTerminatorsPattern=ese;else if(this.config.lineTerminatorCharacters===fx.lineTerminatorCharacters)throw Error(`Error: Missing property on the Lexer config. + For details See: https://chevrotain.io/docs/guide/resolving_lexer_errors.html#MISSING_LINE_TERM_CHARS`);if(r.safeMode&&r.ensureOptimizations)throw Error('"safeMode" and "ensureOptimizations" flags are mutually exclusive.');this.trackStartLines=/full|onlyStart/i.test(this.config.positionTracking),this.trackEndLines=/full/i.test(this.config.positionTracking),Pt(e)?i={modes:{defaultMode:an(e)},defaultMode:Yg}:(a=!1,i=an(e))}),this.config.skipValidations===!1&&(this.TRACE_INIT("performRuntimeChecks",()=>{this.lexerDefinitionErrors=this.lexerDefinitionErrors.concat(Kae(i,this.trackStartLines,this.config.lineTerminatorCharacters))}),this.TRACE_INIT("performWarningRuntimeChecks",()=>{this.lexerDefinitionWarning=this.lexerDefinitionWarning.concat(Qae(i,this.trackStartLines,this.config.lineTerminatorCharacters))})),i.modes=i.modes?i.modes:{},Ae(i.modes,(l,u)=>{i.modes[u]=nf(l,h=>mr(h))});let s=zr(i.modes);if(Ae(i.modes,(l,u)=>{this.TRACE_INIT(`Mode: <${u}> processing`,()=>{if(this.modes.push(u),this.config.skipValidations===!1&&this.TRACE_INIT("validatePatterns",()=>{this.lexerDefinitionErrors=this.lexerDefinitionErrors.concat(jae(l,s))}),ur(this.lexerDefinitionErrors)){Gu(l);let h;this.TRACE_INIT("analyzeTokenTypes",()=>{h=Xae(l,{lineTerminatorCharacters:this.config.lineTerminatorCharacters,positionTracking:r.positionTracking,ensureOptimizations:r.ensureOptimizations,safeMode:r.safeMode,tracer:this.TRACE_INIT})}),this.patternIdxToConfig[u]=h.patternIdxToConfig,this.charCodeToPatternIdxToConfig[u]=h.charCodeToPatternIdxToConfig,this.emptyGroups=ma({},this.emptyGroups,h.emptyGroups),this.hasCustom=h.hasCustom||this.hasCustom,this.canModeBeOptimized[u]=h.canBeOptimized}})}),this.defaultMode=i.defaultMode,!ur(this.lexerDefinitionErrors)&&!this.config.deferDefinitionErrorsHandling){let u=Je(this.lexerDefinitionErrors,h=>h.message).join(`----------------------- `);throw new Error(`Errors detected in definition of Lexer: -`+u)}Ae(this.lexerDefinitionWarning,l=>{ex(l.message)}),this.TRACE_INIT("Choosing sub-methods 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strict";qt();hx();gp();o(Vu,"tokenLabel");o(ON,"hasTokenLabel");UPe="parent",lse="categories",cse="label",use="group",hse="push_mode",fse="pop_mode",dse="longer_alt",pse="line_breaks",mse="start_chars_hint";o(hf,"createToken");o(HPe,"createTokenInternal");uo=hf({name:"EOF",pattern:Xn.NA});Gu([uo]);o(Uu,"createTokenInstance");o(dx,"tokenMatcher")});var Hu,gse,Fl,Kg=N(()=>{"use strict";yp();qt();os();Hu={buildMismatchTokenMessage({expected:t,actual:e,previous:r,ruleName:n}){return`Expecting ${ON(t)?`--> ${Vu(t)} <--`:`token of type --> ${t.name} <--`} but found --> '${e.image}' <--`},buildNotAllInputParsedMessage({firstRedundant:t,ruleName:e}){return"Redundant input, expecting EOF but found: "+t.image},buildNoViableAltMessage({expectedPathsPerAlt:t,actual:e,previous:r,customUserDescription:n,ruleName:i}){let a="Expecting: ",l=` +but found: '`+ia(e).image+"'";if(n)return a+n+l;{let u=Xr(t,(p,m)=>p.concat(m),[]),h=Je(u,p=>`[${Je(p,m=>Vu(m)).join(", ")}]`),d=`one of these possible Token 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i+u+s}}};Object.freeze(Hu);gse={buildRuleNotFoundError(t,e){return"Invalid grammar, reference to a rule which is not defined: ->"+e.nonTerminalName+`<- +inside top level rule: ->`+t.name+"<-"}},Fl={buildDuplicateFoundError(t,e){function r(f){return f instanceof kr?f.terminalType.name:f instanceof on?f.nonTerminalName:""}o(r,"getExtraProductionArgument");let n=t.name,i=ia(e),a=i.idx,s=$s(i),l=r(i),u=a>0,h=`->${s}${u?a:""}<- ${l?`with argument: ->${l}<-`:""} appears more than once (${e.length} times) in the top level rule: ->${n}<-. For further details see: https://chevrotain.io/docs/FAQ.html#NUMERICAL_SUFFIXES `;return h=h.replace(/[ \t]+/g," "),h=h.replace(/\s\s+/g,` @@ -755,14 +770,14 @@ inside top level rule: ->`+t.name+"<-"}},Pl={buildDuplicateFoundError(t,e){funct The grammar has both a Terminal(Token) and a Non-Terminal(Rule) named: <${t.name}>. To resolve this make sure each Terminal and Non-Terminal names are unique This is easy to accomplish by using the convention that Terminal names start with an uppercase letter -and Non-Terminal names start with a lower case letter.`},buildAlternationPrefixAmbiguityError(t){let e=Je(t.prefixPath,i=>Fu(i)).join(", "),r=t.alternation.idx===0?"":t.alternation.idx;return`Ambiguous alternatives: <${t.ambiguityIndices.join(" ,")}> due to common lookahead prefix +and Non-Terminal names start with a lower case letter.`},buildAlternationPrefixAmbiguityError(t){let e=Je(t.prefixPath,i=>Vu(i)).join(", "),r=t.alternation.idx===0?"":t.alternation.idx;return`Ambiguous alternatives: <${t.ambiguityIndices.join(" ,")}> due to common lookahead prefix in inside <${t.topLevelRule.name}> Rule, <${e}> may appears as a prefix path in all these alternatives. See: https://chevrotain.io/docs/guide/resolving_grammar_errors.html#COMMON_PREFIX -For Further details.`},buildAlternationAmbiguityError(t){let e=Je(t.prefixPath,i=>Fu(i)).join(", "),r=t.alternation.idx===0?"":t.alternation.idx,n=`Ambiguous Alternatives Detected: <${t.ambiguityIndices.join(" ,")}> in inside <${t.topLevelRule.name}> Rule, +For Further details.`},buildAlternationAmbiguityError(t){let e=Je(t.prefixPath,i=>Vu(i)).join(", "),r=t.alternation.idx===0?"":t.alternation.idx,n=`Ambiguous Alternatives Detected: <${t.ambiguityIndices.join(" ,")}> in inside <${t.topLevelRule.name}> Rule, <${e}> may appears as a prefix path in all these alternatives. `;return n=n+`See: https://chevrotain.io/docs/guide/resolving_grammar_errors.html#AMBIGUOUS_ALTERNATIVES -For Further details.`,n},buildEmptyRepetitionError(t){let e=Bs(t.repetition);return t.repetition.idx!==0&&(e+=t.repetition.idx),`The repetition <${e}> within Rule <${t.topLevelRule.name}> can never consume any tokens. +For Further details.`,n},buildEmptyRepetitionError(t){let e=$s(t.repetition);return t.repetition.idx!==0&&(e+=t.repetition.idx),`The repetition <${e}> within Rule <${t.topLevelRule.name}> can never consume any tokens. This could lead to an infinite loop.`},buildTokenNameError(t){return"deprecated"},buildEmptyAlternationError(t){return`Ambiguous empty alternative: <${t.emptyChoiceIdx+1}> in inside <${t.topLevelRule.name}> Rule. Only the last alternative may be an empty alternative.`},buildTooManyAlternativesError(t){return`An Alternation cannot have more than 256 alternatives: inside <${t.topLevelRule.name}> Rule. @@ -771,62 +786,62 @@ rule: <${e}> can be invoked from itself (directly or indirectly) without consuming any Tokens. 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n=this.errMsgProvider.buildRuleNotFoundError(this.currTopLevel,e);this.errors.push({message:n,type:zi.UNRESOLVED_SUBRULE_REF,ruleName:this.currTopLevel.name,unresolvedRefName:e.nonTerminalName})}}}});function Fk(t,e,r=[]){r=an(r);let n=[],i=0;function a(l){return l.concat(gi(t,i+1))}o(a,"remainingPathWith");function s(l){let u=Fk(a(l),e,r);return n.concat(u)}for(o(s,"getAlternativesForProd");r.length{ur(u.definition)===!1&&(n=s(u.definition))}),n;if(l instanceof kr)r.push(l.terminalType);else throw Error("non exhaustive match")}i++}return n.push({partialPath:r,suffixDef:gi(t,i)}),n}function $k(t,e,r,n){let i="EXIT_NONE_TERMINAL",a=[i],s="EXIT_ALTERNATIVE",l=!1,u=e.length,h=u-n-1,f=[],d=[];for(d.push({idx:-1,def:t,ruleStack:[],occurrenceStack:[]});!ur(d);){let p=d.pop();if(p===s){l&&ga(d).idx<=h&&d.pop();continue}let m=p.def,g=p.idx,y=p.ruleStack,v=p.occurrenceStack;if(ur(m))continue;let x=m[0];if(x===i){let b={idx:g,def:gi(m),ruleStack:Nu(y),occurrenceStack:Nu(v)};d.push(b)}else if(x 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this.ruleStack=an(this.path.ruleStack).reverse(),this.occurrenceStack=an(this.path.occurrenceStack).reverse(),this.ruleStack.pop(),this.occurrenceStack.pop(),this.updateExpectedNext(),this.walk(this.topProd),this.possibleTokTypes}walk(e,r=[]){this.found||super.walk(e,r)}walkProdRef(e,r,n){if(e.referencedRule.name===this.nextProductionName&&e.idx===this.nextProductionOccurrence){let i=r.concat(n);this.updateExpectedNext(),this.walk(e.referencedRule,i)}}updateExpectedNext(){ur(this.ruleStack)?(this.nextProductionName="",this.nextProductionOccurrence=0,this.isAtEndOfPath=!0):(this.nextProductionName=this.ruleStack.pop(),this.nextProductionOccurrence=this.occurrenceStack.pop())}},Ok=class extends NN{static{o(this,"NextAfterTokenWalker")}constructor(e,r){super(e,r),this.path=r,this.nextTerminalName="",this.nextTerminalOccurrence=0,this.nextTerminalName=this.path.lastTok.name,this.nextTerminalOccurrence=this.path.lastTokOccurrence}walkTerminal(e,r,n){if(this.isAtEndOfPath&&e.terminalType.name===this.nextTerminalName&&e.idx===this.nextTerminalOccurrence&&!this.found){let i=r.concat(n),a=new Dn({definition:i});this.possibleTokTypes=op(a),this.found=!0}}},Ug=class extends Ou{static{o(this,"AbstractNextTerminalAfterProductionWalker")}constructor(e,r){super(),this.topRule=e,this.occurrence=r,this.result={token:void 0,occurrence:void 0,isEndOfRule:void 0}}startWalking(){return this.walk(this.topRule),this.result}},Pk=class extends Ug{static{o(this,"NextTerminalAfterManyWalker")}walkMany(e,r,n){if(e.idx===this.occurrence){let i=ia(r.concat(n));this.result.isEndOfRule=i===void 0,i instanceof kr&&(this.result.token=i.terminalType,this.result.occurrence=i.idx)}else super.walkMany(e,r,n)}},ox=class extends Ug{static{o(this,"NextTerminalAfterManySepWalker")}walkManySep(e,r,n){if(e.idx===this.occurrence){let i=ia(r.concat(n));this.result.isEndOfRule=i===void 0,i instanceof kr&&(this.result.token=i.terminalType,this.result.occurrence=i.idx)}else super.walkManySep(e,r,n)}},Bk=class extends Ug{static{o(this,"NextTerminalAfterAtLeastOneWalker")}walkAtLeastOne(e,r,n){if(e.idx===this.occurrence){let i=ia(r.concat(n));this.result.isEndOfRule=i===void 0,i instanceof kr&&(this.result.token=i.terminalType,this.result.occurrence=i.idx)}else super.walkAtLeastOne(e,r,n)}},lx=class extends Ug{static{o(this,"NextTerminalAfterAtLeastOneSepWalker")}walkAtLeastOneSep(e,r,n){if(e.idx===this.occurrence){let i=ia(r.concat(n));this.result.isEndOfRule=i===void 0,i instanceof kr&&(this.result.token=i.terminalType,this.result.occurrence=i.idx)}else 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l=Je(s,u=>u.GATE);for(let u=0;uqr(u)),l=Xr(s,(u,h,f)=>(Ae(h,d=>{Bt(u,d.tokenTypeIdx)||(u[d.tokenTypeIdx]=f),Ae(d.categoryMatches,p=>{Bt(u,p)||(u[p]=f)})}),u),{});return function(){let u=this.LA(1);return l[u.tokenTypeIdx]}}else return function(){for(let s=0;sa.length===1),i=t.length;if(n&&!r){let a=qr(t);if(a.length===1&&ur(a[0].categoryMatches)){let l=a[0].tokenTypeIdx;return function(){return this.LA(1).tokenTypeIdx===l}}else{let s=Xr(a,(l,u,h)=>(l[u.tokenTypeIdx]=!0,Ae(u.categoryMatches,f=>{l[f]=!0}),l),[]);return function(){let l=this.LA(1);return s[l.tokenTypeIdx]===!0}}}else return function(){e:for(let a=0;aFk([s],1)),n=pse(r.length),i=Je(r,s=>{let l={};return Ae(s,u=>{let h=MN(u.partialPath);Ae(h,f=>{l[f]=!0})}),l}),a=r;for(let s=1;s<=e;s++){let l=a;a=pse(l.length);for(let u=0;u{let x=MN(v.partialPath);Ae(x,b=>{i[u][b]=!0})})}}}}return n}function Hg(t,e,r,n){let i=new zk(t,jn.ALTERNATION,n);return e.accept(i),xse(i.result,r)}function Wg(t,e,r,n){let i=new zk(t,r);e.accept(i);let a=i.result,l=new IN(e,t,r).startWalking(),u=new Dn({definition:a}),h=new Dn({definition:l});return xse([u,h],n)}function Vk(t,e){e:for(let r=0;r{let i=e[n];return r===i||i.categoryMatchesMap[r.tokenTypeIdx]})}function wse(t){return Ma(t,e=>Ma(e,r=>Ma(r,n=>ur(n.categoryMatches))))}var jn,IN,zk,qg=N(()=>{"use strict";qt();cx();Ak();cp();os();(function(t){t[t.OPTION=0]="OPTION",t[t.REPETITION=1]="REPETITION",t[t.REPETITION_MANDATORY=2]="REPETITION_MANDATORY",t[t.REPETITION_MANDATORY_WITH_SEPARATOR=3]="REPETITION_MANDATORY_WITH_SEPARATOR",t[t.REPETITION_WITH_SEPARATOR=4]="REPETITION_WITH_SEPARATOR",t[t.ALTERNATION=5]="ALTERNATION"})(jn||(jn={}));o(ux,"getProdType");o(Gk,"getLookaheadPaths");o(mse,"buildLookaheadFuncForOr");o(gse,"buildLookaheadFuncForOptionalProd");o(yse,"buildAlternativesLookAheadFunc");o(vse,"buildSingleAlternativeLookaheadFunction");IN=class extends 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i=ya(t,u=>ZPe(u,r)),a=iBe(t,e,r),s=ya(t,u=>tBe(u,r)),l=ya(t,u=>eBe(u,t,n,r));return i.concat(a,s,l)}function ZPe(t,e){let r=new ON;t.accept(r);let n=r.allProductions,i=IL(n,JPe),a=Os(i,l=>l.length>1);return Je(br(a),l=>{let u=ia(l),h=e.buildDuplicateFoundError(t,l),f=Bs(u),d={message:h,type:zi.DUPLICATE_PRODUCTIONS,ruleName:t.name,dslName:f,occurrence:u.idx},p=Ese(u);return p&&(d.parameter=p),d})}function JPe(t){return`${Bs(t)}_#_${t.idx}_#_${Ese(t)}`}function Ese(t){return t instanceof kr?t.terminalType.name:t instanceof on?t.nonTerminalName:""}function eBe(t,e,r,n){let i=[];if(Xr(e,(s,l)=>l.name===t.name?s+1:s,0)>1){let s=n.buildDuplicateRuleNameError({topLevelRule:t,grammarName:r});i.push({message:s,type:zi.DUPLICATE_RULE_NAME,ruleName:t.name})}return i}function Sse(t,e,r){let n=[],i;return qn(e,t)||(i=`Invalid rule override, rule: ->${t}<- cannot be overridden in the grammar: ->${r}<-as it is not defined in any of the super grammars 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ur(h)?[{message:e.buildEmptyAlternationError({topLevelRule:t,alternation:a,emptyChoiceIdx:u}),type:zi.NONE_LAST_EMPTY_ALT,ruleName:t.name,occurrence:a.idx,alternative:u+1}]:[]})})}function Ase(t,e,r){let n=new hx;t.accept(n);let i=n.alternations;return i=Jh(i,s=>s.ignoreAmbiguities===!0),ya(i,s=>{let l=s.idx,u=s.maxLookahead||e,h=Hg(l,t,u,s),f=rBe(h,s,t,r),d=nBe(h,s,t,r);return f.concat(d)})}function tBe(t,e){let r=new hx;t.accept(r);let n=r.alternations;return ya(n,a=>a.definition.length>255?[{message:e.buildTooManyAlternativesError({topLevelRule:t,alternation:a}),type:zi.TOO_MANY_ALTS,ruleName:t.name,occurrence:a.idx}]:[])}function _se(t,e,r){let n=[];return Ae(t,i=>{let a=new PN;i.accept(a);let s=a.allProductions;Ae(s,l=>{let u=ux(l),h=l.maxLookahead||e,f=l.idx,p=Wg(f,i,u,h)[0];if(ur(qr(p))){let m=r.buildEmptyRepetitionError({topLevelRule:i,repetition:l});n.push({message:m,type:zi.NO_NON_EMPTY_LOOKAHEAD,ruleName:i.name})}})}),n}function rBe(t,e,r,n){let i=[],a=Xr(t,(l,u,h)=>(e.definition[h].ignoreAmbiguities===!0||Ae(u,f=>{let d=[h];Ae(t,(p,m)=>{h!==m&&Vk(p,f)&&e.definition[m].ignoreAmbiguities!==!0&&d.push(m)}),d.length>1&&!Vk(i,f)&&(i.push(f),l.push({alts:d,path:f}))}),l),[]);return Je(a,l=>{let u=Je(l.alts,f=>f+1);return{message:n.buildAlternationAmbiguityError({topLevelRule:r,alternation:e,ambiguityIndices:u,prefixPath:l.path}),type:zi.AMBIGUOUS_ALTS,ruleName:r.name,occurrence:e.idx,alternatives:l.alts}})}function nBe(t,e,r,n){let i=Xr(t,(s,l,u)=>{let h=Je(l,f=>({idx:u,path:f}));return s.concat(h)},[]);return Tc(ya(i,s=>{if(e.definition[s.idx].ignoreAmbiguities===!0)return[];let u=s.idx,h=s.path,f=Yr(i,p=>e.definition[p.idx].ignoreAmbiguities!==!0&&p.idx{let m=[p.idx+1,u+1],g=e.idx===0?"":e.idx;return{message:n.buildAlternationPrefixAmbiguityError({topLevelRule:r,alternation:e,ambiguityIndices:m,prefixPath:p.path}),type:zi.AMBIGUOUS_PREFIX_ALTS,ruleName:r.name,occurrence:g,alternatives:m}})}))}function iBe(t,e,r){let n=[],i=Je(e,a=>a.name);return Ae(t,a=>{let s=a.name;if(qn(i,s)){let l=r.buildNamespaceConflictError(a);n.push({message:l,type:zi.CONFLICT_TOKENS_RULES_NAMESPACE,ruleName:s})}}),n}var ON,hx,PN,fx=N(()=>{"use strict";qt();Fs();os();qg();cx();cp();o(Tse,"validateLookahead");o(kse,"validateGrammar");o(ZPe,"validateDuplicateProductions");o(JPe,"identifyProductionForDuplicates");o(Ese,"getExtraProductionArgument");ON=class extends ss{static{o(this,"OccurrenceValidationCollector")}constructor(){super(...arguments),this.allProductions=[]}visitNonTerminal(e){this.allProductions.push(e)}visitOption(e){this.allProductions.push(e)}visitRepetitionWithSeparator(e){this.allProductions.push(e)}visitRepetitionMandatory(e){this.allProductions.push(e)}visitRepetitionMandatoryWithSeparator(e){this.allProductions.push(e)}visitRepetition(e){this.allProductions.push(e)}visitAlternation(e){this.allProductions.push(e)}visitTerminal(e){this.allProductions.push(e)}};o(eBe,"validateRuleDoesNotAlreadyExist");o(Sse,"validateRuleIsOverridden");o(BN,"validateNoLeftRecursion");o(Uk,"getFirstNoneTerminal");hx=class extends ss{static{o(this,"OrCollector")}constructor(){super(...arguments),this.alternations=[]}visitAlternation(e){this.alternations.push(e)}};o(Cse,"validateEmptyOrAlternative");o(Ase,"validateAmbiguousAlternationAlternatives");PN=class extends ss{static{o(this,"RepetitionCollector")}constructor(){super(...arguments),this.allProductions=[]}visitRepetitionWithSeparator(e){this.allProductions.push(e)}visitRepetitionMandatory(e){this.allProductions.push(e)}visitRepetitionMandatoryWithSeparator(e){this.allProductions.push(e)}visitRepetition(e){this.allProductions.push(e)}};o(tBe,"validateTooManyAlts");o(_se,"validateSomeNonEmptyLookaheadPath");o(rBe,"checkAlternativesAmbiguities");o(nBe,"checkPrefixAlternativesAmbiguities");o(iBe,"checkTerminalAndNoneTerminalsNameSpace")});function Dse(t){let e=Qh(t,{errMsgProvider:hse}),r={};return Ae(t.rules,n=>{r[n.name]=n}),fse(r,e.errMsgProvider)}function Lse(t){return t=Qh(t,{errMsgProvider:Pl}),kse(t.rules,t.tokenTypes,t.errMsgProvider,t.grammarName)}var Rse=N(()=>{"use strict";qt();dse();fx();Vg();o(Dse,"resolveGrammar");o(Lse,"validateGrammar")});function lf(t){return qn(Pse,t.name)}var Nse,Mse,Ise,Ose,Pse,Yg,hp,dx,px,mx,Xg=N(()=>{"use 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l=this.getKeyForAutomaticLookahead(n,i),u=this.firstAfterRepMap[l];if(u===void 0){let p=this.getCurrRuleFullName(),m=this.getGAstProductions()[p];u=new a(m,i).startWalking(),this.firstAfterRepMap[l]=u}let h=u.token,f=u.occurrence,d=u.isEndOfRule;this.RULE_STACK.length===1&&d&&h===void 0&&(h=lo,f=1),!(h===void 0||f===void 0)&&this.shouldInRepetitionRecoveryBeTried(h,f,s)&&this.tryInRepetitionRecovery(t,e,r,h)}var FN,zN,$N,Hk,GN=N(()=>{"use strict";up();qt();Xg();bN();Fs();FN={},zN="InRuleRecoveryException",$N=class extends Error{static{o(this,"InRuleRecoveryException")}constructor(e){super(e),this.name=zN}},Hk=class{static{o(this,"Recoverable")}initRecoverable(e){this.firstAfterRepMap={},this.resyncFollows={},this.recoveryEnabled=Bt(e,"recoveryEnabled")?e.recoveryEnabled:ls.recoveryEnabled,this.recoveryEnabled&&(this.attemptInRepetitionRecovery=aBe)}getTokenToInsert(e){let r=$u(e,"",NaN,NaN,NaN,NaN,NaN,NaN);return r.isInsertedInRecovery=!0,r}canTokenTypeBeInsertedInRecovery(e){return!0}canTokenTypeBeDeletedInRecovery(e){return!0}tryInRepetitionRecovery(e,r,n,i){let a=this.findReSyncTokenType(),s=this.exportLexerState(),l=[],u=!1,h=this.LA(1),f=this.LA(1),d=o(()=>{let p=this.LA(0),m=this.errorMessageProvider.buildMismatchTokenMessage({expected:i,actual:h,previous:p,ruleName:this.getCurrRuleFullName()}),g=new hp(m,h,this.LA(0));g.resyncedTokens=Nu(l),this.SAVE_ERROR(g)},"generateErrorMessage");for(;!u;)if(this.tokenMatcher(f,i)){d();return}else if(n.call(this)){d(),e.apply(this,r);return}else this.tokenMatcher(f,a)?u=!0:(f=this.SKIP_TOKEN(),this.addToResyncTokens(f,l));this.importLexerState(s)}shouldInRepetitionRecoveryBeTried(e,r,n){return!(n===!1||this.tokenMatcher(this.LA(1),e)||this.isBackTracking()||this.canPerformInRuleRecovery(e,this.getFollowsForInRuleRecovery(e,r)))}getFollowsForInRuleRecovery(e,r){let n=this.getCurrentGrammarPath(e,r);return this.getNextPossibleTokenTypes(n)}tryInRuleRecovery(e,r){if(this.canRecoverWithSingleTokenInsertion(e,r))return this.getTokenToInsert(e);if(this.canRecoverWithSingleTokenDeletion(e)){let n=this.SKIP_TOKEN();return this.consumeToken(),n}throw new $N("sad sad panda")}canPerformInRuleRecovery(e,r){return this.canRecoverWithSingleTokenInsertion(e,r)||this.canRecoverWithSingleTokenDeletion(e)}canRecoverWithSingleTokenInsertion(e,r){if(!this.canTokenTypeBeInsertedInRecovery(e)||ur(r))return!1;let n=this.LA(1);return ns(r,a=>this.tokenMatcher(n,a))!==void 0}canRecoverWithSingleTokenDeletion(e){return this.canTokenTypeBeDeletedInRecovery(e)?this.tokenMatcher(this.LA(2),e):!1}isInCurrentRuleReSyncSet(e){let r=this.getCurrFollowKey(),n=this.getFollowSetFromFollowKey(r);return qn(n,e)}findReSyncTokenType(){let e=this.flattenFollowSet(),r=this.LA(1),n=2;for(;;){let i=ns(e,a=>sx(r,a));if(i!==void 0)return i;r=this.LA(n),n++}}getCurrFollowKey(){if(this.RULE_STACK.length===1)return FN;let e=this.getLastExplicitRuleShortName(),r=this.getLastExplicitRuleOccurrenceIndex(),n=this.getPreviousExplicitRuleShortName();return{ruleName:this.shortRuleNameToFullName(e),idxInCallingRule:r,inRule:this.shortRuleNameToFullName(n)}}buildFullFollowKeyStack(){let e=this.RULE_STACK,r=this.RULE_OCCURRENCE_STACK;return Je(e,(n,i)=>i===0?FN:{ruleName:this.shortRuleNameToFullName(n),idxInCallingRule:r[i],inRule:this.shortRuleNameToFullName(e[i-1])})}flattenFollowSet(){let e=Je(this.buildFullFollowKeyStack(),r=>this.getFollowSetFromFollowKey(r));return qr(e)}getFollowSetFromFollowKey(e){if(e===FN)return[lo];let r=e.ruleName+e.idxInCallingRule+_k+e.inRule;return this.resyncFollows[r]}addToResyncTokens(e,r){return this.tokenMatcher(e,lo)||r.push(e),r}reSyncTo(e){let r=[],n=this.LA(1);for(;this.tokenMatcher(n,e)===!1;)n=this.SKIP_TOKEN(),this.addToResyncTokens(n,r);return Nu(r)}attemptInRepetitionRecovery(e,r,n,i,a,s,l){}getCurrentGrammarPath(e,r){let n=this.getHumanReadableRuleStack(),i=an(this.RULE_OCCURRENCE_STACK);return{ruleStack:n,occurrenceStack:i,lastTok:e,lastTokOccurrence:r}}getHumanReadableRuleStack(){return Je(this.RULE_STACK,e=>this.shortRuleNameToFullName(e))}};o(aBe,"attemptInRepetitionRecovery")});function Wk(t,e,r){return r|e|t}var qk=N(()=>{"use strict";o(Wk,"getKeyForAutomaticLookahead")});var Gu,VN=N(()=>{"use strict";qt();Vg();Fs();fx();qg();Gu=class{static{o(this,"LLkLookaheadStrategy")}constructor(e){var r;this.maxLookahead=(r=e?.maxLookahead)!==null&&r!==void 0?r:ls.maxLookahead}validate(e){let r=this.validateNoLeftRecursion(e.rules);if(ur(r)){let n=this.validateEmptyOrAlternatives(e.rules),i=this.validateAmbiguousAlternationAlternatives(e.rules,this.maxLookahead),a=this.validateSomeNonEmptyLookaheadPath(e.rules,this.maxLookahead);return[...r,...n,...i,...a]}return r}validateNoLeftRecursion(e){return ya(e,r=>BN(r,r,Pl))}validateEmptyOrAlternatives(e){return ya(e,r=>Cse(r,Pl))}validateAmbiguousAlternationAlternatives(e,r){return ya(e,n=>Ase(n,r,Pl))}validateSomeNonEmptyLookaheadPath(e,r){return _se(e,r,Pl)}buildLookaheadForAlternation(e){return mse(e.prodOccurrence,e.rule,e.maxLookahead,e.hasPredicates,e.dynamicTokensEnabled,yse)}buildLookaheadForOptional(e){return gse(e.prodOccurrence,e.rule,e.maxLookahead,e.dynamicTokensEnabled,ux(e.prodType),vse)}}});function sBe(t){Yk.reset(),t.accept(Yk);let e=Yk.dslMethods;return Yk.reset(),e}var Xk,UN,Yk,Bse=N(()=>{"use strict";qt();Fs();qk();os();VN();Xk=class{static{o(this,"LooksAhead")}initLooksAhead(e){this.dynamicTokensEnabled=Bt(e,"dynamicTokensEnabled")?e.dynamicTokensEnabled:ls.dynamicTokensEnabled,this.maxLookahead=Bt(e,"maxLookahead")?e.maxLookahead:ls.maxLookahead,this.lookaheadStrategy=Bt(e,"lookaheadStrategy")?e.lookaheadStrategy:new Gu({maxLookahead:this.maxLookahead}),this.lookAheadFuncsCache=new Map}preComputeLookaheadFunctions(e){Ae(e,r=>{this.TRACE_INIT(`${r.name} Rule 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d=this.lookaheadStrategy.buildLookaheadForAlternation({prodOccurrence:h.idx,rule:r,maxLookahead:h.maxLookahead||this.maxLookahead,hasPredicates:h.hasPredicates,dynamicTokensEnabled:this.dynamicTokensEnabled}),p=Wk(this.fullRuleNameToShort[r.name],256,h.idx);this.setLaFuncCache(p,d)})}),Ae(i,h=>{this.computeLookaheadFunc(r,h.idx,768,"Repetition",h.maxLookahead,Bs(h))}),Ae(a,h=>{this.computeLookaheadFunc(r,h.idx,512,"Option",h.maxLookahead,Bs(h))}),Ae(s,h=>{this.computeLookaheadFunc(r,h.idx,1024,"RepetitionMandatory",h.maxLookahead,Bs(h))}),Ae(l,h=>{this.computeLookaheadFunc(r,h.idx,1536,"RepetitionMandatoryWithSeparator",h.maxLookahead,Bs(h))}),Ae(u,h=>{this.computeLookaheadFunc(r,h.idx,1280,"RepetitionWithSeparator",h.maxLookahead,Bs(h))})})})}computeLookaheadFunc(e,r,n,i,a,s){this.TRACE_INIT(`${s}${r===0?"":r}`,()=>{let l=this.lookaheadStrategy.buildLookaheadForOptional({prodOccurrence:r,rule:e,maxLookahead:a||this.maxLookahead,dynamicTokensEnabled:this.dynamicTokensEnabled,prodType:i}),u=Wk(this.fullRuleNameToShort[e.name],n,r);this.setLaFuncCache(u,l)})}getKeyForAutomaticLookahead(e,r){let n=this.getLastExplicitRuleShortName();return Wk(n,e,r)}getLaFuncFromCache(e){return this.lookAheadFuncsCache.get(e)}setLaFuncCache(e,r){this.lookAheadFuncsCache.set(e,r)}},UN=class extends ss{static{o(this,"DslMethodsCollectorVisitor")}constructor(){super(...arguments),this.dslMethods={option:[],alternation:[],repetition:[],repetitionWithSeparator:[],repetitionMandatory:[],repetitionMandatoryWithSeparator:[]}}reset(){this.dslMethods={option:[],alternation:[],repetition:[],repetitionWithSeparator:[],repetitionMandatory:[],repetitionMandatoryWithSeparator:[]}}visitOption(e){this.dslMethods.option.push(e)}visitRepetitionWithSeparator(e){this.dslMethods.repetitionWithSeparator.push(e)}visitRepetitionMandatory(e){this.dslMethods.repetitionMandatory.push(e)}visitRepetitionMandatoryWithSeparator(e){this.dslMethods.repetitionMandatoryWithSeparator.push(e)}visitRepetition(e){this.dslMethods.repetition.push(e)}visitAlternation(e){this.dslMethods.alternation.push(e)}},Yk=new UN;o(sBe,"collectMethods")});function qN(t,e){isNaN(t.startOffset)===!0?(t.startOffset=e.startOffset,t.endOffset=e.endOffset):t.endOffset{"use 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ss{static{o(this,"GastRefResolverVisitor")}constructor(e,r){super(),this.nameToTopRule=e,this.errMsgProvider=r,this.errors=[]}resolveRefs(){Ae(br(this.nameToTopRule),e=>{this.currTopLevel=e,e.accept(this)})}visitNonTerminal(e){let r=this.nameToTopRule[e.nonTerminalName];if(r)e.referencedRule=r;else{let n=this.errMsgProvider.buildRuleNotFoundError(this.currTopLevel,e);this.errors.push({message:n,type:Gi.UNRESOLVED_SUBRULE_REF,ruleName:this.currTopLevel.name,unresolvedRefName:e.nonTerminalName})}}}});function Wk(t,e,r=[]){r=an(r);let n=[],i=0;function a(l){return l.concat(yi(t,i+1))}o(a,"remainingPathWith");function s(l){let u=Wk(a(l),e,r);return n.concat(u)}for(o(s,"getAlternativesForProd");r.length{ur(u.definition)===!1&&(n=s(u.definition))}),n;if(l instanceof kr)r.push(l.terminalType);else throw Error("non exhaustive match")}i++}return n.push({partialPath:r,suffixDef:yi(t,i)}),n}function qk(t,e,r,n){let i="EXIT_NONE_TERMINAL",a=[i],s="EXIT_ALTERNATIVE",l=!1,u=e.length,h=u-n-1,f=[],d=[];for(d.push({idx:-1,def:t,ruleStack:[],occurrenceStack:[]});!ur(d);){let p=d.pop();if(p===s){l&&ga(d).idx<=h&&d.pop();continue}let m=p.def,g=p.idx,y=p.ruleStack,v=p.occurrenceStack;if(ur(m))continue;let x=m[0];if(x===i){let b={idx:g,def:yi(m),ruleStack:Pu(y),occurrenceStack:Pu(v)};d.push(b)}else if(x instanceof kr)if(g=0;b--){let w=x.definition[b],C={idx:g,def:w.definition.concat(yi(m)),ruleStack:y,occurrenceStack:v};d.push(C),d.push(s)}else if(x instanceof Dn)d.push({idx:g,def:x.definition.concat(yi(m)),ruleStack:y,occurrenceStack:v});else if(x instanceof as)d.push(WPe(x,g,y,v));else throw Error("non exhaustive match")}return f}function WPe(t,e,r,n){let i=an(r);i.push(t.name);let a=an(n);return a.push(1),{idx:e,def:t.definition,ruleStack:i,occurrenceStack:a}}var BN,Vk,Qg,Uk,px,Hk,mx,gx=N(()=>{"use strict";qt();EN();Ik();os();BN=class extends $u{static{o(this,"AbstractNextPossibleTokensWalker")}constructor(e,r){super(),this.topProd=e,this.path=r,this.possibleTokTypes=[],this.nextProductionName="",this.nextProductionOccurrence=0,this.found=!1,this.isAtEndOfPath=!1}startWalking(){if(this.found=!1,this.path.ruleStack[0]!==this.topProd.name)throw Error("The path does not start with the walker's top Rule!");return this.ruleStack=an(this.path.ruleStack).reverse(),this.occurrenceStack=an(this.path.occurrenceStack).reverse(),this.ruleStack.pop(),this.occurrenceStack.pop(),this.updateExpectedNext(),this.walk(this.topProd),this.possibleTokTypes}walk(e,r=[]){this.found||super.walk(e,r)}walkProdRef(e,r,n){if(e.referencedRule.name===this.nextProductionName&&e.idx===this.nextProductionOccurrence){let i=r.concat(n);this.updateExpectedNext(),this.walk(e.referencedRule,i)}}updateExpectedNext(){ur(this.ruleStack)?(this.nextProductionName="",this.nextProductionOccurrence=0,this.isAtEndOfPath=!0):(this.nextProductionName=this.ruleStack.pop(),this.nextProductionOccurrence=this.occurrenceStack.pop())}},Vk=class extends BN{static{o(this,"NextAfterTokenWalker")}constructor(e,r){super(e,r),this.path=r,this.nextTerminalName="",this.nextTerminalOccurrence=0,this.nextTerminalName=this.path.lastTok.name,this.nextTerminalOccurrence=this.path.lastTokOccurrence}walkTerminal(e,r,n){if(this.isAtEndOfPath&&e.terminalType.name===this.nextTerminalName&&e.idx===this.nextTerminalOccurrence&&!this.found){let i=r.concat(n),a=new Dn({definition:i});this.possibleTokTypes=pp(a),this.found=!0}}},Qg=class extends $u{static{o(this,"AbstractNextTerminalAfterProductionWalker")}constructor(e,r){super(),this.topRule=e,this.occurrence=r,this.result={token:void 0,occurrence:void 0,isEndOfRule:void 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Qg{static{o(this,"NextTerminalAfterAtLeastOneSepWalker")}walkAtLeastOneSep(e,r,n){if(e.idx===this.occurrence){let i=ia(r.concat(n));this.result.isEndOfRule=i===void 0,i instanceof kr&&(this.result.token=i.terminalType,this.result.occurrence=i.idx)}else super.walkAtLeastOneSep(e,r,n)}};o(Wk,"possiblePathsFrom");o(qk,"nextPossibleTokensAfter");o(WPe,"expandTopLevelRule")});function yx(t){if(t instanceof ln||t==="Option")return jn.OPTION;if(t instanceof Or||t==="Repetition")return jn.REPETITION;if(t instanceof Ln||t==="RepetitionMandatory")return jn.REPETITION_MANDATORY;if(t instanceof Rn||t==="RepetitionMandatoryWithSeparator")return jn.REPETITION_MANDATORY_WITH_SEPARATOR;if(t instanceof wn||t==="RepetitionWithSeparator")return jn.REPETITION_WITH_SEPARATOR;if(t instanceof Tn||t==="Alternation")return jn.ALTERNATION;throw Error("non exhaustive match")}function Xk(t){let{occurrence:e,rule:r,prodType:n,maxLookahead:i}=t,a=yx(n);return a===jn.ALTERNATION?Zg(e,r,i):Jg(e,r,a,i)}function bse(t,e,r,n,i,a){let s=Zg(t,e,r),l=Cse(s)?Xg:zu;return a(s,n,l,i)}function wse(t,e,r,n,i,a){let s=Jg(t,e,i,r),l=Cse(s)?Xg:zu;return a(s[0],l,n)}function Tse(t,e,r,n){let i=t.length,a=Ma(t,s=>Ma(s,l=>l.length===1));if(e)return function(s){let l=Je(s,u=>u.GATE);for(let u=0;uqr(u)),l=Xr(s,(u,h,f)=>(Ae(h,d=>{Bt(u,d.tokenTypeIdx)||(u[d.tokenTypeIdx]=f),Ae(d.categoryMatches,p=>{Bt(u,p)||(u[p]=f)})}),u),{});return function(){let u=this.LA(1);return l[u.tokenTypeIdx]}}else return function(){for(let s=0;sa.length===1),i=t.length;if(n&&!r){let a=qr(t);if(a.length===1&&ur(a[0].categoryMatches)){let l=a[0].tokenTypeIdx;return function(){return this.LA(1).tokenTypeIdx===l}}else{let s=Xr(a,(l,u,h)=>(l[u.tokenTypeIdx]=!0,Ae(u.categoryMatches,f=>{l[f]=!0}),l),[]);return function(){let l=this.LA(1);return s[l.tokenTypeIdx]===!0}}}else return function(){e:for(let a=0;aWk([s],1)),n=xse(r.length),i=Je(r,s=>{let l={};return Ae(s,u=>{let h=FN(u.partialPath);Ae(h,f=>{l[f]=!0})}),l}),a=r;for(let 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e.idx===this.targetOccurrence&&this.targetProdType===r?(this.restDef=n.concat(i),!0):!1}walkOption(e,r,n){this.checkIsTarget(e,jn.OPTION,r,n)||super.walkOption(e,r,n)}walkAtLeastOne(e,r,n){this.checkIsTarget(e,jn.REPETITION_MANDATORY,r,n)||super.walkOption(e,r,n)}walkAtLeastOneSep(e,r,n){this.checkIsTarget(e,jn.REPETITION_MANDATORY_WITH_SEPARATOR,r,n)||super.walkOption(e,r,n)}walkMany(e,r,n){this.checkIsTarget(e,jn.REPETITION,r,n)||super.walkOption(e,r,n)}walkManySep(e,r,n){this.checkIsTarget(e,jn.REPETITION_WITH_SEPARATOR,r,n)||super.walkOption(e,r,n)}},Yk=class extends ss{static{o(this,"InsideDefinitionFinderVisitor")}constructor(e,r,n){super(),this.targetOccurrence=e,this.targetProdType=r,this.targetRef=n,this.result=[]}checkIsTarget(e,r){e.idx===this.targetOccurrence&&this.targetProdType===r&&(this.targetRef===void 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i=ya(t,u=>YPe(u,r)),a=JPe(t,e,r),s=ya(t,u=>KPe(u,r)),l=ya(t,u=>jPe(u,t,n,r));return i.concat(a,s,l)}function YPe(t,e){let r=new zN;t.accept(r);let n=r.allProductions,i=$L(n,XPe),a=Bs(i,l=>l.length>1);return Je(br(a),l=>{let u=ia(l),h=e.buildDuplicateFoundError(t,l),f=$s(u),d={message:h,type:Gi.DUPLICATE_PRODUCTIONS,ruleName:t.name,dslName:f,occurrence:u.idx},p=Dse(u);return p&&(d.parameter=p),d})}function XPe(t){return`${$s(t)}_#_${t.idx}_#_${Dse(t)}`}function Dse(t){return t instanceof kr?t.terminalType.name:t instanceof on?t.nonTerminalName:""}function jPe(t,e,r,n){let i=[];if(Xr(e,(s,l)=>l.name===t.name?s+1:s,0)>1){let s=n.buildDuplicateRuleNameError({topLevelRule:t,grammarName:r});i.push({message:s,type:Gi.DUPLICATE_RULE_NAME,ruleName:t.name})}return i}function Lse(t,e,r){let n=[],i;return qn(e,t)||(i=`Invalid rule override, rule: ->${t}<- cannot be overridden in the grammar: ->${r}<-as it is not defined in any of the super grammars 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ur(h)?[{message:e.buildEmptyAlternationError({topLevelRule:t,alternation:a,emptyChoiceIdx:u}),type:Gi.NONE_LAST_EMPTY_ALT,ruleName:t.name,occurrence:a.idx,alternative:u+1}]:[]})})}function Nse(t,e,r){let n=new vx;t.accept(n);let i=n.alternations;return i=nf(i,s=>s.ignoreAmbiguities===!0),ya(i,s=>{let l=s.idx,u=s.maxLookahead||e,h=Zg(l,t,u,s),f=QPe(h,s,t,r),d=ZPe(h,s,t,r);return f.concat(d)})}function KPe(t,e){let r=new vx;t.accept(r);let n=r.alternations;return ya(n,a=>a.definition.length>255?[{message:e.buildTooManyAlternativesError({topLevelRule:t,alternation:a}),type:Gi.TOO_MANY_ALTS,ruleName:t.name,occurrence:a.idx}]:[])}function Mse(t,e,r){let n=[];return Ae(t,i=>{let a=new GN;i.accept(a);let s=a.allProductions;Ae(s,l=>{let u=yx(l),h=l.maxLookahead||e,f=l.idx,p=Jg(f,i,u,h)[0];if(ur(qr(p))){let m=r.buildEmptyRepetitionError({topLevelRule:i,repetition:l});n.push({message:m,type:Gi.NO_NON_EMPTY_LOOKAHEAD,ruleName:i.name})}})}),n}function QPe(t,e,r,n){let i=[],a=Xr(t,(l,u,h)=>(e.definition[h].ignoreAmbiguities===!0||Ae(u,f=>{let d=[h];Ae(t,(p,m)=>{h!==m&&jk(p,f)&&e.definition[m].ignoreAmbiguities!==!0&&d.push(m)}),d.length>1&&!jk(i,f)&&(i.push(f),l.push({alts:d,path:f}))}),l),[]);return Je(a,l=>{let u=Je(l.alts,f=>f+1);return{message:n.buildAlternationAmbiguityError({topLevelRule:r,alternation:e,ambiguityIndices:u,prefixPath:l.path}),type:Gi.AMBIGUOUS_ALTS,ruleName:r.name,occurrence:e.idx,alternatives:l.alts}})}function ZPe(t,e,r,n){let i=Xr(t,(s,l,u)=>{let h=Je(l,f=>({idx:u,path:f}));return s.concat(h)},[]);return Ec(ya(i,s=>{if(e.definition[s.idx].ignoreAmbiguities===!0)return[];let u=s.idx,h=s.path,f=Yr(i,p=>e.definition[p.idx].ignoreAmbiguities!==!0&&p.idx{let m=[p.idx+1,u+1],g=e.idx===0?"":e.idx;return{message:n.buildAlternationPrefixAmbiguityError({topLevelRule:r,alternation:e,ambiguityIndices:m,prefixPath:p.path}),type:Gi.AMBIGUOUS_PREFIX_ALTS,ruleName:r.name,occurrence:g,alternatives:m}})}))}function JPe(t,e,r){let n=[],i=Je(e,a=>a.name);return Ae(t,a=>{let s=a.name;if(qn(i,s)){let l=r.buildNamespaceConflictError(a);n.push({message:l,type:Gi.CONFLICT_TOKENS_RULES_NAMESPACE,ruleName:s})}}),n}var zN,vx,GN,xx=N(()=>{"use strict";qt();zs();os();e1();gx();gp();o(Ase,"validateLookahead");o(_se,"validateGrammar");o(YPe,"validateDuplicateProductions");o(XPe,"identifyProductionForDuplicates");o(Dse,"getExtraProductionArgument");zN=class extends 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l=this.getKeyForAutomaticLookahead(n,i),u=this.firstAfterRepMap[l];if(u===void 0){let p=this.getCurrRuleFullName(),m=this.getGAstProductions()[p];u=new a(m,i).startWalking(),this.firstAfterRepMap[l]=u}let h=u.token,f=u.occurrence,d=u.isEndOfRule;this.RULE_STACK.length===1&&d&&h===void 0&&(h=uo,f=1),!(h===void 0||f===void 0)&&this.shouldInRepetitionRecoveryBeTried(h,f,s)&&this.tryInRepetitionRecovery(t,e,r,h)}var UN,WN,HN,Qk,qN=N(()=>{"use strict";yp();qt();r1();SN();zs();UN={},WN="InRuleRecoveryException",HN=class extends Error{static{o(this,"InRuleRecoveryException")}constructor(e){super(e),this.name=WN}},Qk=class{static{o(this,"Recoverable")}initRecoverable(e){this.firstAfterRepMap={},this.resyncFollows={},this.recoveryEnabled=Bt(e,"recoveryEnabled")?e.recoveryEnabled:ls.recoveryEnabled,this.recoveryEnabled&&(this.attemptInRepetitionRecovery=eBe)}getTokenToInsert(e){let r=Uu(e,"",NaN,NaN,NaN,NaN,NaN,NaN);return 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ss{static{o(this,"DslMethodsCollectorVisitor")}constructor(){super(...arguments),this.dslMethods={option:[],alternation:[],repetition:[],repetitionWithSeparator:[],repetitionMandatory:[],repetitionMandatoryWithSeparator:[]}}reset(){this.dslMethods={option:[],alternation:[],repetition:[],repetitionWithSeparator:[],repetitionMandatory:[],repetitionMandatoryWithSeparator:[]}}visitOption(e){this.dslMethods.option.push(e)}visitRepetitionWithSeparator(e){this.dslMethods.repetitionWithSeparator.push(e)}visitRepetitionMandatory(e){this.dslMethods.repetitionMandatory.push(e)}visitRepetitionMandatoryWithSeparator(e){this.dslMethods.repetitionMandatoryWithSeparator.push(e)}visitRepetition(e){this.dslMethods.repetition.push(e)}visitAlternation(e){this.dslMethods.alternation.push(e)}},eE=new XN;o(tBe,"collectMethods")});function QN(t,e){isNaN(t.startOffset)===!0?(t.startOffset=e.startOffset,t.endOffset=e.endOffset):t.endOffset{"use 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if(/full/i.test(this.nodeLocationTracking))this.recoveryEnabled?(this.setNodeLocationFromToken=YN,this.setNodeLocationFromNode=YN,this.cstPostRule=ni,this.setInitialNodeLocation=this.setInitialNodeLocationFullRecovery):(this.setNodeLocationFromToken=ni,this.setNodeLocationFromNode=ni,this.cstPostRule=this.cstPostRuleFull,this.setInitialNodeLocation=this.setInitialNodeLocationFullRegular);else if(/onlyOffset/i.test(this.nodeLocationTracking))this.recoveryEnabled?(this.setNodeLocationFromToken=qN,this.setNodeLocationFromNode=qN,this.cstPostRule=ni,this.setInitialNodeLocation=this.setInitialNodeLocationOnlyOffsetRecovery):(this.setNodeLocationFromToken=ni,this.setNodeLocationFromNode=ni,this.cstPostRule=this.cstPostRuleOnlyOffset,this.setInitialNodeLocation=this.setInitialNodeLocationOnlyOffsetRegular);else if(/none/i.test(this.nodeLocationTracking))this.setNodeLocationFromToken=ni,this.setNodeLocationFromNode=ni,this.cstPostRule=ni,this.setInitialNodeLocation=ni;else throw Error(`Invalid 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s={message:Pl.buildDuplicateRuleNameError({topLevelRule:e,grammarName:this.className}),type:zi.DUPLICATE_RULE_NAME,ruleName:e};this.definitionErrors.push(s)}this.definedRulesNames.push(e);let i=this.defineRule(e,r,n);return this[e]=i,i}OVERRIDE_RULE(e,r,n=Kg){let i=Sse(e,this.definedRulesNames,this.className);this.definitionErrors=this.definitionErrors.concat(i);let a=this.defineRule(e,r,n);return this[e]=a,a}BACKTRACK(e,r){return function(){this.isBackTrackingStack.push(1);let n=this.saveRecogState();try{return e.apply(this,r),!0}catch(i){if(lf(i))return!1;throw i}finally{this.reloadRecogState(n),this.isBackTrackingStack.pop()}}}getGAstProductions(){return this.gastProductionsCache}getSerializedGastProductions(){return Sk(br(this.gastProductionsCache))}}});var tE,Xse=N(()=>{"use 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r=this.LA(0),n=e.location;n.startOffset<=r.startOffset?n.endOffset=r.endOffset:n.startOffset=NaN}cstPostTerminal(e,r){let n=this.CST_STACK[this.CST_STACK.length-1];Use(n,r,e),this.setNodeLocationFromToken(n.location,r)}cstPostNonTerminal(e,r){let n=this.CST_STACK[this.CST_STACK.length-1];Hse(n,r,e),this.setNodeLocationFromNode(n.location,e.location)}getBaseCstVisitorConstructor(){if(mr(this.baseCstVisitorConstructor)){let e=Yse(this.className,zr(this.gastProductionsCache));return this.baseCstVisitorConstructor=e,e}return this.baseCstVisitorConstructor}getBaseCstVisitorConstructorWithDefaults(){if(mr(this.baseCstVisitorWithDefaultsConstructor)){let e=Xse(this.className,zr(this.gastProductionsCache),this.getBaseCstVisitorConstructor());return this.baseCstVisitorWithDefaultsConstructor=e,e}return this.baseCstVisitorWithDefaultsConstructor}getLastExplicitRuleShortName(){let e=this.RULE_STACK;return e[e.length-1]}getPreviousExplicitRuleShortName(){let e=this.RULE_STACK;return e[e.length-2]}getLastExplicitRuleOccurrenceIndex(){let e=this.RULE_OCCURRENCE_STACK;return e[e.length-1]}}});var sE,Qse=N(()=>{"use strict";zs();sE=class{static{o(this,"LexerAdapter")}initLexerAdapter(){this.tokVector=[],this.tokVectorLength=0,this.currIdx=-1}set input(e){if(this.selfAnalysisDone!==!0)throw Error("Missing invocation at the end of the Parser's constructor.");this.reset(),this.tokVector=e,this.tokVectorLength=e.length}get input(){return this.tokVector}SKIP_TOKEN(){return this.currIdx<=this.tokVector.length-2?(this.consumeToken(),this.LA(1)):n1}LA(e){let r=this.currIdx+e;return r<0||this.tokVectorLength<=r?n1:this.tokVector[r]}consumeToken(){this.currIdx++}exportLexerState(){return this.currIdx}importLexerState(e){this.currIdx=e}resetLexerState(){this.currIdx=-1}moveToTerminatedState(){this.currIdx=this.tokVector.length-1}getLexerPosition(){return this.exportLexerState()}}});var oE,Zse=N(()=>{"use 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this.subruleInternal(e,2,r)}SUBRULE3(e,r){return this.subruleInternal(e,3,r)}SUBRULE4(e,r){return this.subruleInternal(e,4,r)}SUBRULE5(e,r){return this.subruleInternal(e,5,r)}SUBRULE6(e,r){return this.subruleInternal(e,6,r)}SUBRULE7(e,r){return this.subruleInternal(e,7,r)}SUBRULE8(e,r){return this.subruleInternal(e,8,r)}SUBRULE9(e,r){return this.subruleInternal(e,9,r)}OPTION(e){return this.optionInternal(e,0)}OPTION1(e){return this.optionInternal(e,1)}OPTION2(e){return this.optionInternal(e,2)}OPTION3(e){return this.optionInternal(e,3)}OPTION4(e){return this.optionInternal(e,4)}OPTION5(e){return this.optionInternal(e,5)}OPTION6(e){return this.optionInternal(e,6)}OPTION7(e){return this.optionInternal(e,7)}OPTION8(e){return this.optionInternal(e,8)}OPTION9(e){return this.optionInternal(e,9)}OR(e){return this.orInternal(e,0)}OR1(e){return this.orInternal(e,1)}OR2(e){return this.orInternal(e,2)}OR3(e){return this.orInternal(e,3)}OR4(e){return this.orInternal(e,4)}OR5(e){return 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s={message:Fl.buildDuplicateRuleNameError({topLevelRule:e,grammarName:this.className}),type:Gi.DUPLICATE_RULE_NAME,ruleName:e};this.definitionErrors.push(s)}this.definedRulesNames.push(e);let i=this.defineRule(e,r,n);return this[e]=i,i}OVERRIDE_RULE(e,r,n=i1){let i=Lse(e,this.definedRulesNames,this.className);this.definitionErrors=this.definitionErrors.concat(i);let a=this.defineRule(e,r,n);return this[e]=a,a}BACKTRACK(e,r){return function(){this.isBackTrackingStack.push(1);let n=this.saveRecogState();try{return e.apply(this,r),!0}catch(i){if(ff(i))return!1;throw i}finally{this.reloadRecogState(n),this.isBackTrackingStack.pop()}}}getGAstProductions(){return this.gastProductionsCache}getSerializedGastProductions(){return Nk(br(this.gastProductionsCache))}}});var lE,Jse=N(()=>{"use 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i=Bt(n,"resyncEnabled")?n.resyncEnabled:Kg.resyncEnabled,a=Bt(n,"recoveryValueFunc")?n.recoveryValueFunc:Kg.recoveryValueFunc,s=this.ruleShortNameIdx<<12;this.ruleShortNameIdx++,this.shortRuleNameToFull[s]=e,this.fullRuleNameToShort[e]=s;let l;return this.outputCst===!0?l=o(function(...f){try{this.ruleInvocationStateUpdate(s,e,this.subruleIdx),r.apply(this,f);let d=this.CST_STACK[this.CST_STACK.length-1];return this.cstPostRule(d),d}catch(d){return this.invokeRuleCatch(d,i,a)}finally{this.ruleFinallyStateUpdate()}},"invokeRuleWithTry"):l=o(function(...f){try{return this.ruleInvocationStateUpdate(s,e,this.subruleIdx),r.apply(this,f)}catch(d){return this.invokeRuleCatch(d,i,a)}finally{this.ruleFinallyStateUpdate()}},"invokeRuleWithTryCst"),Object.assign(l,{ruleName:e,originalGrammarAction:r})}invokeRuleCatch(e,r,n){let i=this.RULE_STACK.length===1,a=r&&!this.isBackTracking()&&this.recoveryEnabled;if(lf(e)){let s=e;if(a){let l=this.findReSyncTokenType();if(this.isInCurrentRuleReSyncSet(l))if(s.resyncedTokens=this.reSyncTo(l),this.outputCst){let u=this.CST_STACK[this.CST_STACK.length-1];return u.recoveredNode=!0,u}else return n(e);else{if(this.outputCst){let u=this.CST_STACK[this.CST_STACK.length-1];u.recoveredNode=!0,s.partialCstResult=u}throw s}}else{if(i)return this.moveToTerminatedState(),n(e);throw s}}else throw e}optionInternal(e,r){let n=this.getKeyForAutomaticLookahead(512,r);return this.optionInternalLogic(e,r,n)}optionInternalLogic(e,r,n){let i=this.getLaFuncFromCache(n),a;if(typeof e!="function"){a=e.DEF;let s=e.GATE;if(s!==void 0){let l=i;i=o(()=>s.call(this)&&l.call(this),"lookAheadFunc")}}else a=e;if(i.call(this)===!0)return a.call(this)}atLeastOneInternal(e,r){let n=this.getKeyForAutomaticLookahead(1024,e);return this.atLeastOneInternalLogic(e,r,n)}atLeastOneInternalLogic(e,r,n){let i=this.getLaFuncFromCache(n),a;if(typeof r!="function"){a=r.DEF;let s=r.GATE;if(s!==void 0){let l=i;i=o(()=>s.call(this)&&l.call(this),"lookAheadFunc")}}else a=r;if(i.call(this)===!0){let s=this.doSingleRepetition(a);for(;i.call(this)===!0&&s===!0;)s=this.doSingleRepetition(a)}else throw this.raiseEarlyExitException(e,jn.REPETITION_MANDATORY,r.ERR_MSG);this.attemptInRepetitionRecovery(this.atLeastOneInternal,[e,r],i,1024,e,Bk)}atLeastOneSepFirstInternal(e,r){let n=this.getKeyForAutomaticLookahead(1536,e);this.atLeastOneSepFirstInternalLogic(e,r,n)}atLeastOneSepFirstInternalLogic(e,r,n){let i=r.DEF,a=r.SEP;if(this.getLaFuncFromCache(n).call(this)===!0){i.call(this);let l=o(()=>this.tokenMatcher(this.LA(1),a),"separatorLookAheadFunc");for(;this.tokenMatcher(this.LA(1),a)===!0;)this.CONSUME(a),i.call(this);this.attemptInRepetitionRecovery(this.repetitionSepSecondInternal,[e,a,l,i,lx],l,1536,e,lx)}else throw this.raiseEarlyExitException(e,jn.REPETITION_MANDATORY_WITH_SEPARATOR,r.ERR_MSG)}manyInternal(e,r){let n=this.getKeyForAutomaticLookahead(768,e);return this.manyInternalLogic(e,r,n)}manyInternalLogic(e,r,n){let i=this.getLaFuncFromCache(n),a;if(typeof r!="function"){a=r.DEF;let l=r.GATE;if(l!==void 0){let u=i;i=o(()=>l.call(this)&&u.call(this),"lookaheadFunction")}}else a=r;let s=!0;for(;i.call(this)===!0&&s===!0;)s=this.doSingleRepetition(a);this.attemptInRepetitionRecovery(this.manyInternal,[e,r],i,768,e,Pk,s)}manySepFirstInternal(e,r){let n=this.getKeyForAutomaticLookahead(1280,e);this.manySepFirstInternalLogic(e,r,n)}manySepFirstInternalLogic(e,r,n){let i=r.DEF,a=r.SEP;if(this.getLaFuncFromCache(n).call(this)===!0){i.call(this);let l=o(()=>this.tokenMatcher(this.LA(1),a),"separatorLookAheadFunc");for(;this.tokenMatcher(this.LA(1),a)===!0;)this.CONSUME(a),i.call(this);this.attemptInRepetitionRecovery(this.repetitionSepSecondInternal,[e,a,l,i,ox],l,1280,e,ox)}}repetitionSepSecondInternal(e,r,n,i,a){for(;n();)this.CONSUME(r),i.call(this);this.attemptInRepetitionRecovery(this.repetitionSepSecondInternal,[e,r,n,i,a],n,1536,e,a)}doSingleRepetition(e){let r=this.getLexerPosition();return e.call(this),this.getLexerPosition()>r}orInternal(e,r){let n=this.getKeyForAutomaticLookahead(256,r),i=Pt(e)?e:e.DEF,s=this.getLaFuncFromCache(n).call(this,i);if(s!==void 0)return i[s].ALT.call(this);this.raiseNoAltException(r,e.ERR_MSG)}ruleFinallyStateUpdate(){if(this.RULE_STACK.pop(),this.RULE_OCCURRENCE_STACK.pop(),this.cstFinallyStateUpdate(),this.RULE_STACK.length===0&&this.isAtEndOfInput()===!1){let e=this.LA(1),r=this.errorMessageProvider.buildNotAllInputParsedMessage({firstRedundant:e,ruleName:this.getCurrRuleFullName()});this.SAVE_ERROR(new px(r,e))}}subruleInternal(e,r,n){let i;try{let a=n!==void 0?n.ARGS:void 0;return this.subruleIdx=r,i=e.apply(this,a),this.cstPostNonTerminal(i,n!==void 0&&n.LABEL!==void 0?n.LABEL:e.ruleName),i}catch(a){throw this.subruleInternalError(a,n,e.ruleName)}}subruleInternalError(e,r,n){throw lf(e)&&e.partialCstResult!==void 0&&(this.cstPostNonTerminal(e.partialCstResult,r!==void 0&&r.LABEL!==void 0?r.LABEL:n),delete e.partialCstResult),e}consumeInternal(e,r,n){let i;try{let a=this.LA(1);this.tokenMatcher(a,e)===!0?(this.consumeToken(),i=a):this.consumeInternalError(e,a,n)}catch(a){i=this.consumeInternalRecovery(e,r,a)}return this.cstPostTerminal(n!==void 0&&n.LABEL!==void 0?n.LABEL:e.name,i),i}consumeInternalError(e,r,n){let i,a=this.LA(0);throw n!==void 0&&n.ERR_MSG?i=n.ERR_MSG:i=this.errorMessageProvider.buildMismatchTokenMessage({expected:e,actual:r,previous:a,ruleName:this.getCurrRuleFullName()}),this.SAVE_ERROR(new hp(i,r,a))}consumeInternalRecovery(e,r,n){if(this.recoveryEnabled&&n.name==="MismatchedTokenException"&&!this.isBackTracking()){let i=this.getFollowsForInRuleRecovery(e,r);try{return this.tryInRuleRecovery(e,i)}catch(a){throw a.name===zN?n:a}}else throw n}saveRecogState(){let e=this.errors,r=an(this.RULE_STACK);return{errors:e,lexerState:this.exportLexerState(),RULE_STACK:r,CST_STACK:this.CST_STACK}}reloadRecogState(e){this.errors=e.errors,this.importLexerState(e.lexerState),this.RULE_STACK=e.RULE_STACK}ruleInvocationStateUpdate(e,r,n){this.RULE_OCCURRENCE_STACK.push(n),this.RULE_STACK.push(e),this.cstInvocationStateUpdate(r)}isBackTracking(){return this.isBackTrackingStack.length!==0}getCurrRuleFullName(){let e=this.getLastExplicitRuleShortName();return this.shortRuleNameToFull[e]}shortRuleNameToFullName(e){return this.shortRuleNameToFull[e]}isAtEndOfInput(){return this.tokenMatcher(this.LA(1),lo)}reset(){this.resetLexerState(),this.subruleIdx=0,this.isBackTrackingStack=[],this.errors=[],this.RULE_STACK=[],this.CST_STACK=[],this.RULE_OCCURRENCE_STACK=[]}}});var rE,jse=N(()=>{"use strict";Xg();qt();qg();Fs();rE=class{static{o(this,"ErrorHandler")}initErrorHandler(e){this._errors=[],this.errorMessageProvider=Bt(e,"errorMessageProvider")?e.errorMessageProvider:ls.errorMessageProvider}SAVE_ERROR(e){if(lf(e))return e.context={ruleStack:this.getHumanReadableRuleStack(),ruleOccurrenceStack:an(this.RULE_OCCURRENCE_STACK)},this._errors.push(e),e;throw Error("Trying to save an Error which is not a RecognitionException")}get errors(){return an(this._errors)}set errors(e){this._errors=e}raiseEarlyExitException(e,r,n){let i=this.getCurrRuleFullName(),a=this.getGAstProductions()[i],l=Wg(e,a,r,this.maxLookahead)[0],u=[];for(let f=1;f<=this.maxLookahead;f++)u.push(this.LA(f));let h=this.errorMessageProvider.buildEarlyExitMessage({expectedIterationPaths:l,actual:u,previous:this.LA(0),customUserDescription:n,ruleName:i});throw this.SAVE_ERROR(new mx(h,this.LA(1),this.LA(0)))}raiseNoAltException(e,r){let n=this.getCurrRuleFullName(),i=this.getGAstProductions()[n],a=Hg(e,i,this.maxLookahead),s=[];for(let h=1;h<=this.maxLookahead;h++)s.push(this.LA(h));let l=this.LA(0),u=this.errorMessageProvider.buildNoViableAltMessage({expectedPathsPerAlt:a,actual:s,previous:l,customUserDescription:r,ruleName:this.getCurrRuleFullName()});throw this.SAVE_ERROR(new dx(u,this.LA(1),l))}}});var nE,Kse=N(()=>{"use strict";cx();qt();nE=class{static{o(this,"ContentAssist")}initContentAssist(){}computeContentAssist(e,r){let n=this.gastProductionsCache[e];if(pr(n))throw Error(`Rule ->${e}<- does not exist in this grammar.`);return $k([n],r,this.tokenMatcher,this.maxLookahead)}getNextPossibleTokenTypes(e){let r=ia(e.ruleStack),i=this.getGAstProductions()[r];return new Ok(i,e).startWalking()}}});function yx(t,e,r,n=!1){aE(r);let i=ga(this.recordingProdStack),a=Si(e)?e:e.DEF,s=new t({definition:[],idx:r});return n&&(s.separator=e.SEP),Bt(e,"MAX_LOOKAHEAD")&&(s.maxLookahead=e.MAX_LOOKAHEAD),this.recordingProdStack.push(s),a.call(this),i.definition.push(s),this.recordingProdStack.pop(),sE}function dBe(t,e){aE(e);let r=ga(this.recordingProdStack),n=Pt(t)===!1,i=n===!1?t:t.DEF,a=new Tn({definition:[],idx:e,ignoreAmbiguities:n&&t.IGNORE_AMBIGUITIES===!0});Bt(t,"MAX_LOOKAHEAD")&&(a.maxLookahead=t.MAX_LOOKAHEAD);let s=A2(i,l=>Si(l.GATE));return a.hasPredicates=s,r.definition.push(a),Ae(i,l=>{let u=new Dn({definition:[]});a.definition.push(u),Bt(l,"IGNORE_AMBIGUITIES")?u.ignoreAmbiguities=l.IGNORE_AMBIGUITIES:Bt(l,"GATE")&&(u.ignoreAmbiguities=!0),this.recordingProdStack.push(u),l.ALT.call(this),this.recordingProdStack.pop()}),sE}function Jse(t){return t===0?"":`${t}`}function aE(t){if(t<0||t>Zse){let e=new Error(`Invalid DSL Method idx value: <${t}> - Idx value must be a none negative value smaller than ${Zse+1}`);throw e.KNOWN_RECORDER_ERROR=!0,e}}var sE,Qse,Zse,eoe,toe,fBe,iE,roe=N(()=>{"use strict";qt();os();ix();cp();up();Fs();qk();sE={description:"This Object indicates the Parser is during Recording Phase"};Object.freeze(sE);Qse=!0,Zse=Math.pow(2,8)-1,eoe=of({name:"RECORDING_PHASE_TOKEN",pattern:Xn.NA});Bu([eoe]);toe=$u(eoe,`This IToken indicates the Parser is in Recording Phase - See: https://chevrotain.io/docs/guide/internals.html#grammar-recording for details`,-1,-1,-1,-1,-1,-1);Object.freeze(toe);fBe={name:`This CSTNode indicates the Parser is in Recording Phase - See: https://chevrotain.io/docs/guide/internals.html#grammar-recording for details`,children:{}},iE=class{static{o(this,"GastRecorder")}initGastRecorder(e){this.recordingProdStack=[],this.RECORDING_PHASE=!1}enableRecording(){this.RECORDING_PHASE=!0,this.TRACE_INIT("Enable Recording",()=>{for(let e=0;e<10;e++){let r=e>0?e:"";this[`CONSUME${r}`]=function(n,i){return this.consumeInternalRecord(n,e,i)},this[`SUBRULE${r}`]=function(n,i){return this.subruleInternalRecord(n,e,i)},this[`OPTION${r}`]=function(n){return this.optionInternalRecord(n,e)},this[`OR${r}`]=function(n){return this.orInternalRecord(n,e)},this[`MANY${r}`]=function(n){this.manyInternalRecord(e,n)},this[`MANY_SEP${r}`]=function(n){this.manySepFirstInternalRecord(e,n)},this[`AT_LEAST_ONE${r}`]=function(n){this.atLeastOneInternalRecord(e,n)},this[`AT_LEAST_ONE_SEP${r}`]=function(n){this.atLeastOneSepFirstInternalRecord(e,n)}}this.consume=function(e,r,n){return this.consumeInternalRecord(r,e,n)},this.subrule=function(e,r,n){return this.subruleInternalRecord(r,e,n)},this.option=function(e,r){return this.optionInternalRecord(r,e)},this.or=function(e,r){return this.orInternalRecord(r,e)},this.many=function(e,r){this.manyInternalRecord(e,r)},this.atLeastOne=function(e,r){this.atLeastOneInternalRecord(e,r)},this.ACTION=this.ACTION_RECORD,this.BACKTRACK=this.BACKTRACK_RECORD,this.LA=this.LA_RECORD})}disableRecording(){this.RECORDING_PHASE=!1,this.TRACE_INIT("Deleting Recording methods",()=>{let e=this;for(let r=0;r<10;r++){let n=r>0?r:"";delete e[`CONSUME${n}`],delete e[`SUBRULE${n}`],delete e[`OPTION${n}`],delete e[`OR${n}`],delete e[`MANY${n}`],delete e[`MANY_SEP${n}`],delete e[`AT_LEAST_ONE${n}`],delete e[`AT_LEAST_ONE_SEP${n}`]}delete e.consume,delete e.subrule,delete e.option,delete e.or,delete e.many,delete e.atLeastOne,delete e.ACTION,delete e.BACKTRACK,delete e.LA})}ACTION_RECORD(e){}BACKTRACK_RECORD(e,r){return()=>!0}LA_RECORD(e){return jg}topLevelRuleRecord(e,r){try{let n=new as({definition:[],name:e});return n.name=e,this.recordingProdStack.push(n),r.call(this),this.recordingProdStack.pop(),n}catch(n){if(n.KNOWN_RECORDER_ERROR!==!0)try{n.message=n.message+` + For Further details.`)}if(Pt(e))this.tokensMap=Xr(e,(a,s)=>(a[s.name]=s,a),{});else if(Bt(e,"modes")&&Ma(qr(br(e.modes)),ose)){let a=qr(br(e.modes)),s=Hm(a);this.tokensMap=Xr(s,(l,u)=>(l[u.name]=u,l),{})}else if(bn(e))this.tokensMap=an(e);else throw new Error(" argument must be An Array of Token constructors, A dictionary of Token constructors or an IMultiModeLexerDefinition");this.tokensMap.EOF=uo;let n=Bt(e,"modes")?qr(br(e.modes)):br(e),i=Ma(n,a=>ur(a.categoryMatches));this.tokenMatcher=i?Xg:zu,Gu(br(this.tokensMap))}defineRule(e,r,n){if(this.selfAnalysisDone)throw Error(`Grammar rule <${e}> may not be defined after the 'performSelfAnalysis' method has been called' +Make sure that all grammar rule definitions are done before 'performSelfAnalysis' is called.`);let i=Bt(n,"resyncEnabled")?n.resyncEnabled:i1.resyncEnabled,a=Bt(n,"recoveryValueFunc")?n.recoveryValueFunc:i1.recoveryValueFunc,s=this.ruleShortNameIdx<<12;this.ruleShortNameIdx++,this.shortRuleNameToFull[s]=e,this.fullRuleNameToShort[e]=s;let l;return this.outputCst===!0?l=o(function(...f){try{this.ruleInvocationStateUpdate(s,e,this.subruleIdx),r.apply(this,f);let d=this.CST_STACK[this.CST_STACK.length-1];return this.cstPostRule(d),d}catch(d){return this.invokeRuleCatch(d,i,a)}finally{this.ruleFinallyStateUpdate()}},"invokeRuleWithTry"):l=o(function(...f){try{return this.ruleInvocationStateUpdate(s,e,this.subruleIdx),r.apply(this,f)}catch(d){return this.invokeRuleCatch(d,i,a)}finally{this.ruleFinallyStateUpdate()}},"invokeRuleWithTryCst"),Object.assign(l,{ruleName:e,originalGrammarAction:r})}invokeRuleCatch(e,r,n){let i=this.RULE_STACK.length===1,a=r&&!this.isBackTracking()&&this.recoveryEnabled;if(ff(e)){let s=e;if(a){let l=this.findReSyncTokenType();if(this.isInCurrentRuleReSyncSet(l))if(s.resyncedTokens=this.reSyncTo(l),this.outputCst){let u=this.CST_STACK[this.CST_STACK.length-1];return u.recoveredNode=!0,u}else return n(e);else{if(this.outputCst){let u=this.CST_STACK[this.CST_STACK.length-1];u.recoveredNode=!0,s.partialCstResult=u}throw s}}else{if(i)return this.moveToTerminatedState(),n(e);throw s}}else throw e}optionInternal(e,r){let n=this.getKeyForAutomaticLookahead(512,r);return this.optionInternalLogic(e,r,n)}optionInternalLogic(e,r,n){let i=this.getLaFuncFromCache(n),a;if(typeof e!="function"){a=e.DEF;let s=e.GATE;if(s!==void 0){let l=i;i=o(()=>s.call(this)&&l.call(this),"lookAheadFunc")}}else a=e;if(i.call(this)===!0)return a.call(this)}atLeastOneInternal(e,r){let n=this.getKeyForAutomaticLookahead(1024,e);return this.atLeastOneInternalLogic(e,r,n)}atLeastOneInternalLogic(e,r,n){let i=this.getLaFuncFromCache(n),a;if(typeof r!="function"){a=r.DEF;let s=r.GATE;if(s!==void 0){let l=i;i=o(()=>s.call(this)&&l.call(this),"lookAheadFunc")}}else a=r;if(i.call(this)===!0){let s=this.doSingleRepetition(a);for(;i.call(this)===!0&&s===!0;)s=this.doSingleRepetition(a)}else throw this.raiseEarlyExitException(e,jn.REPETITION_MANDATORY,r.ERR_MSG);this.attemptInRepetitionRecovery(this.atLeastOneInternal,[e,r],i,1024,e,Hk)}atLeastOneSepFirstInternal(e,r){let n=this.getKeyForAutomaticLookahead(1536,e);this.atLeastOneSepFirstInternalLogic(e,r,n)}atLeastOneSepFirstInternalLogic(e,r,n){let i=r.DEF,a=r.SEP;if(this.getLaFuncFromCache(n).call(this)===!0){i.call(this);let l=o(()=>this.tokenMatcher(this.LA(1),a),"separatorLookAheadFunc");for(;this.tokenMatcher(this.LA(1),a)===!0;)this.CONSUME(a),i.call(this);this.attemptInRepetitionRecovery(this.repetitionSepSecondInternal,[e,a,l,i,mx],l,1536,e,mx)}else throw this.raiseEarlyExitException(e,jn.REPETITION_MANDATORY_WITH_SEPARATOR,r.ERR_MSG)}manyInternal(e,r){let n=this.getKeyForAutomaticLookahead(768,e);return this.manyInternalLogic(e,r,n)}manyInternalLogic(e,r,n){let i=this.getLaFuncFromCache(n),a;if(typeof r!="function"){a=r.DEF;let l=r.GATE;if(l!==void 0){let u=i;i=o(()=>l.call(this)&&u.call(this),"lookaheadFunction")}}else a=r;let s=!0;for(;i.call(this)===!0&&s===!0;)s=this.doSingleRepetition(a);this.attemptInRepetitionRecovery(this.manyInternal,[e,r],i,768,e,Uk,s)}manySepFirstInternal(e,r){let n=this.getKeyForAutomaticLookahead(1280,e);this.manySepFirstInternalLogic(e,r,n)}manySepFirstInternalLogic(e,r,n){let i=r.DEF,a=r.SEP;if(this.getLaFuncFromCache(n).call(this)===!0){i.call(this);let l=o(()=>this.tokenMatcher(this.LA(1),a),"separatorLookAheadFunc");for(;this.tokenMatcher(this.LA(1),a)===!0;)this.CONSUME(a),i.call(this);this.attemptInRepetitionRecovery(this.repetitionSepSecondInternal,[e,a,l,i,px],l,1280,e,px)}}repetitionSepSecondInternal(e,r,n,i,a){for(;n();)this.CONSUME(r),i.call(this);this.attemptInRepetitionRecovery(this.repetitionSepSecondInternal,[e,r,n,i,a],n,1536,e,a)}doSingleRepetition(e){let r=this.getLexerPosition();return e.call(this),this.getLexerPosition()>r}orInternal(e,r){let n=this.getKeyForAutomaticLookahead(256,r),i=Pt(e)?e:e.DEF,s=this.getLaFuncFromCache(n).call(this,i);if(s!==void 0)return i[s].ALT.call(this);this.raiseNoAltException(r,e.ERR_MSG)}ruleFinallyStateUpdate(){if(this.RULE_STACK.pop(),this.RULE_OCCURRENCE_STACK.pop(),this.cstFinallyStateUpdate(),this.RULE_STACK.length===0&&this.isAtEndOfInput()===!1){let e=this.LA(1),r=this.errorMessageProvider.buildNotAllInputParsedMessage({firstRedundant:e,ruleName:this.getCurrRuleFullName()});this.SAVE_ERROR(new wx(r,e))}}subruleInternal(e,r,n){let i;try{let a=n!==void 0?n.ARGS:void 0;return this.subruleIdx=r,i=e.apply(this,a),this.cstPostNonTerminal(i,n!==void 0&&n.LABEL!==void 0?n.LABEL:e.ruleName),i}catch(a){throw this.subruleInternalError(a,n,e.ruleName)}}subruleInternalError(e,r,n){throw ff(e)&&e.partialCstResult!==void 0&&(this.cstPostNonTerminal(e.partialCstResult,r!==void 0&&r.LABEL!==void 0?r.LABEL:n),delete e.partialCstResult),e}consumeInternal(e,r,n){let i;try{let a=this.LA(1);this.tokenMatcher(a,e)===!0?(this.consumeToken(),i=a):this.consumeInternalError(e,a,n)}catch(a){i=this.consumeInternalRecovery(e,r,a)}return this.cstPostTerminal(n!==void 0&&n.LABEL!==void 0?n.LABEL:e.name,i),i}consumeInternalError(e,r,n){let i,a=this.LA(0);throw n!==void 0&&n.ERR_MSG?i=n.ERR_MSG:i=this.errorMessageProvider.buildMismatchTokenMessage({expected:e,actual:r,previous:a,ruleName:this.getCurrRuleFullName()}),this.SAVE_ERROR(new vp(i,r,a))}consumeInternalRecovery(e,r,n){if(this.recoveryEnabled&&n.name==="MismatchedTokenException"&&!this.isBackTracking()){let i=this.getFollowsForInRuleRecovery(e,r);try{return this.tryInRuleRecovery(e,i)}catch(a){throw a.name===WN?n:a}}else throw n}saveRecogState(){let e=this.errors,r=an(this.RULE_STACK);return{errors:e,lexerState:this.exportLexerState(),RULE_STACK:r,CST_STACK:this.CST_STACK}}reloadRecogState(e){this.errors=e.errors,this.importLexerState(e.lexerState),this.RULE_STACK=e.RULE_STACK}ruleInvocationStateUpdate(e,r,n){this.RULE_OCCURRENCE_STACK.push(n),this.RULE_STACK.push(e),this.cstInvocationStateUpdate(r)}isBackTracking(){return this.isBackTrackingStack.length!==0}getCurrRuleFullName(){let e=this.getLastExplicitRuleShortName();return this.shortRuleNameToFull[e]}shortRuleNameToFullName(e){return this.shortRuleNameToFull[e]}isAtEndOfInput(){return this.tokenMatcher(this.LA(1),uo)}reset(){this.resetLexerState(),this.subruleIdx=0,this.isBackTrackingStack=[],this.errors=[],this.RULE_STACK=[],this.CST_STACK=[],this.RULE_OCCURRENCE_STACK=[]}}});var cE,eoe=N(()=>{"use strict";r1();qt();e1();zs();cE=class{static{o(this,"ErrorHandler")}initErrorHandler(e){this._errors=[],this.errorMessageProvider=Bt(e,"errorMessageProvider")?e.errorMessageProvider:ls.errorMessageProvider}SAVE_ERROR(e){if(ff(e))return e.context={ruleStack:this.getHumanReadableRuleStack(),ruleOccurrenceStack:an(this.RULE_OCCURRENCE_STACK)},this._errors.push(e),e;throw Error("Trying to save an Error which is not a RecognitionException")}get errors(){return an(this._errors)}set errors(e){this._errors=e}raiseEarlyExitException(e,r,n){let i=this.getCurrRuleFullName(),a=this.getGAstProductions()[i],l=Jg(e,a,r,this.maxLookahead)[0],u=[];for(let f=1;f<=this.maxLookahead;f++)u.push(this.LA(f));let h=this.errorMessageProvider.buildEarlyExitMessage({expectedIterationPaths:l,actual:u,previous:this.LA(0),customUserDescription:n,ruleName:i});throw this.SAVE_ERROR(new Tx(h,this.LA(1),this.LA(0)))}raiseNoAltException(e,r){let n=this.getCurrRuleFullName(),i=this.getGAstProductions()[n],a=Zg(e,i,this.maxLookahead),s=[];for(let h=1;h<=this.maxLookahead;h++)s.push(this.LA(h));let l=this.LA(0),u=this.errorMessageProvider.buildNoViableAltMessage({expectedPathsPerAlt:a,actual:s,previous:l,customUserDescription:r,ruleName:this.getCurrRuleFullName()});throw this.SAVE_ERROR(new bx(u,this.LA(1),l))}}});var uE,toe=N(()=>{"use strict";gx();qt();uE=class{static{o(this,"ContentAssist")}initContentAssist(){}computeContentAssist(e,r){let n=this.gastProductionsCache[e];if(mr(n))throw Error(`Rule ->${e}<- does not exist in this grammar.`);return qk([n],r,this.tokenMatcher,this.maxLookahead)}getNextPossibleTokenTypes(e){let r=ia(e.ruleStack),i=this.getGAstProductions()[r];return new Vk(i,e).startWalking()}}});function Ex(t,e,r,n=!1){fE(r);let i=ga(this.recordingProdStack),a=Ci(e)?e:e.DEF,s=new t({definition:[],idx:r});return n&&(s.separator=e.SEP),Bt(e,"MAX_LOOKAHEAD")&&(s.maxLookahead=e.MAX_LOOKAHEAD),this.recordingProdStack.push(s),a.call(this),i.definition.push(s),this.recordingProdStack.pop(),dE}function lBe(t,e){fE(e);let r=ga(this.recordingProdStack),n=Pt(t)===!1,i=n===!1?t:t.DEF,a=new Tn({definition:[],idx:e,ignoreAmbiguities:n&&t.IGNORE_AMBIGUITIES===!0});Bt(t,"MAX_LOOKAHEAD")&&(a.maxLookahead=t.MAX_LOOKAHEAD);let s=I2(i,l=>Ci(l.GATE));return a.hasPredicates=s,r.definition.push(a),Ae(i,l=>{let u=new Dn({definition:[]});a.definition.push(u),Bt(l,"IGNORE_AMBIGUITIES")?u.ignoreAmbiguities=l.IGNORE_AMBIGUITIES:Bt(l,"GATE")&&(u.ignoreAmbiguities=!0),this.recordingProdStack.push(u),l.ALT.call(this),this.recordingProdStack.pop()}),dE}function ioe(t){return t===0?"":`${t}`}function fE(t){if(t<0||t>noe){let e=new Error(`Invalid DSL Method idx value: <${t}> + Idx value must be a none negative value smaller than ${noe+1}`);throw e.KNOWN_RECORDER_ERROR=!0,e}}var dE,roe,noe,aoe,soe,oBe,hE,ooe=N(()=>{"use strict";qt();os();hx();gp();yp();zs();Jk();dE={description:"This Object indicates the Parser is during Recording Phase"};Object.freeze(dE);roe=!0,noe=Math.pow(2,8)-1,aoe=hf({name:"RECORDING_PHASE_TOKEN",pattern:Xn.NA});Gu([aoe]);soe=Uu(aoe,`This IToken indicates the Parser is in Recording Phase + See: https://chevrotain.io/docs/guide/internals.html#grammar-recording for details`,-1,-1,-1,-1,-1,-1);Object.freeze(soe);oBe={name:`This CSTNode indicates the Parser is in Recording Phase + See: https://chevrotain.io/docs/guide/internals.html#grammar-recording for details`,children:{}},hE=class{static{o(this,"GastRecorder")}initGastRecorder(e){this.recordingProdStack=[],this.RECORDING_PHASE=!1}enableRecording(){this.RECORDING_PHASE=!0,this.TRACE_INIT("Enable Recording",()=>{for(let e=0;e<10;e++){let r=e>0?e:"";this[`CONSUME${r}`]=function(n,i){return this.consumeInternalRecord(n,e,i)},this[`SUBRULE${r}`]=function(n,i){return this.subruleInternalRecord(n,e,i)},this[`OPTION${r}`]=function(n){return this.optionInternalRecord(n,e)},this[`OR${r}`]=function(n){return this.orInternalRecord(n,e)},this[`MANY${r}`]=function(n){this.manyInternalRecord(e,n)},this[`MANY_SEP${r}`]=function(n){this.manySepFirstInternalRecord(e,n)},this[`AT_LEAST_ONE${r}`]=function(n){this.atLeastOneInternalRecord(e,n)},this[`AT_LEAST_ONE_SEP${r}`]=function(n){this.atLeastOneSepFirstInternalRecord(e,n)}}this.consume=function(e,r,n){return this.consumeInternalRecord(r,e,n)},this.subrule=function(e,r,n){return this.subruleInternalRecord(r,e,n)},this.option=function(e,r){return this.optionInternalRecord(r,e)},this.or=function(e,r){return this.orInternalRecord(r,e)},this.many=function(e,r){this.manyInternalRecord(e,r)},this.atLeastOne=function(e,r){this.atLeastOneInternalRecord(e,r)},this.ACTION=this.ACTION_RECORD,this.BACKTRACK=this.BACKTRACK_RECORD,this.LA=this.LA_RECORD})}disableRecording(){this.RECORDING_PHASE=!1,this.TRACE_INIT("Deleting Recording methods",()=>{let e=this;for(let r=0;r<10;r++){let n=r>0?r:"";delete e[`CONSUME${n}`],delete e[`SUBRULE${n}`],delete e[`OPTION${n}`],delete e[`OR${n}`],delete e[`MANY${n}`],delete e[`MANY_SEP${n}`],delete e[`AT_LEAST_ONE${n}`],delete e[`AT_LEAST_ONE_SEP${n}`]}delete e.consume,delete e.subrule,delete e.option,delete e.or,delete e.many,delete e.atLeastOne,delete e.ACTION,delete e.BACKTRACK,delete e.LA})}ACTION_RECORD(e){}BACKTRACK_RECORD(e,r){return()=>!0}LA_RECORD(e){return n1}topLevelRuleRecord(e,r){try{let n=new as({definition:[],name:e});return n.name=e,this.recordingProdStack.push(n),r.call(this),this.recordingProdStack.pop(),n}catch(n){if(n.KNOWN_RECORDER_ERROR!==!0)try{n.message=n.message+` This error was thrown during the "grammar recording phase" For more info see: - https://chevrotain.io/docs/guide/internals.html#grammar-recording`}catch{throw n}throw n}}optionInternalRecord(e,r){return yx.call(this,ln,e,r)}atLeastOneInternalRecord(e,r){yx.call(this,Ln,r,e)}atLeastOneSepFirstInternalRecord(e,r){yx.call(this,Rn,r,e,Qse)}manyInternalRecord(e,r){yx.call(this,Or,r,e)}manySepFirstInternalRecord(e,r){yx.call(this,wn,r,e,Qse)}orInternalRecord(e,r){return dBe.call(this,e,r)}subruleInternalRecord(e,r,n){if(aE(r),!e||Bt(e,"ruleName")===!1){let l=new Error(` argument is invalid expecting a Parser method reference but got: <${JSON.stringify(e)}> - inside top level rule: <${this.recordingProdStack[0].name}>`);throw l.KNOWN_RECORDER_ERROR=!0,l}let i=ga(this.recordingProdStack),a=e.ruleName,s=new on({idx:r,nonTerminalName:a,label:n?.LABEL,referencedRule:void 0});return i.definition.push(s),this.outputCst?fBe:sE}consumeInternalRecord(e,r,n){if(aE(r),!_N(e)){let s=new Error(` argument is invalid expecting a TokenType reference but got: <${JSON.stringify(e)}> - inside top level rule: <${this.recordingProdStack[0].name}>`);throw s.KNOWN_RECORDER_ERROR=!0,s}let i=ga(this.recordingProdStack),a=new kr({idx:r,terminalType:e,label:n?.LABEL});return i.definition.push(a),toe}};o(yx,"recordProd");o(dBe,"recordOrProd");o(Jse,"getIdxSuffix");o(aE,"assertMethodIdxIsValid")});var oE,noe=N(()=>{"use strict";qt();Og();Fs();oE=class{static{o(this,"PerformanceTracer")}initPerformanceTracer(e){if(Bt(e,"traceInitPerf")){let r=e.traceInitPerf,n=typeof r=="number";this.traceInitMaxIdent=n?r:1/0,this.traceInitPerf=n?r>0:r}else this.traceInitMaxIdent=0,this.traceInitPerf=ls.traceInitPerf;this.traceInitIndent=-1}TRACE_INIT(e,r){if(this.traceInitPerf===!0){this.traceInitIndent++;let n=new Array(this.traceInitIndent+1).join(" ");this.traceInitIndent <${e}>`);let{time:i,value:a}=tx(r),s=i>10?console.warn:console.log;return this.traceInitIndent time: ${i}ms`),this.traceInitIndent--,a}else return r()}}});function ioe(t,e){e.forEach(r=>{let n=r.prototype;Object.getOwnPropertyNames(n).forEach(i=>{if(i==="constructor")return;let a=Object.getOwnPropertyDescriptor(n,i);a&&(a.get||a.set)?Object.defineProperty(t.prototype,i,a):t.prototype[i]=r.prototype[i]})})}var aoe=N(()=>{"use strict";o(ioe,"applyMixins")});function lE(t=void 0){return function(){return t}}var jg,ls,Kg,zi,vx,xx,Fs=N(()=>{"use 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l;return((l=s.data)===null||l===void 0?void 0:l.code)===jo.LinkingError}))))return a;try{a.push(...await this.validateAst(i.value,r,n))}catch(s){if(Bc(s))throw s;console.error("An error occurred during validation:",s)}return await xi(n),a}processLexingErrors(e,r,n){var i,a,s;let l=[...e.lexerErrors,...(a=(i=e.lexerReport)===null||i===void 0?void 0:i.diagnostics)!==null&&a!==void 0?a:[]];for(let u of l){let h=(s=u.severity)!==null&&s!==void 0?s:"error",f={severity:RE(h),range:{start:{line:u.line-1,character:u.column-1},end:{line:u.line-1,character:u.column+u.length-1}},message:u.message,data:Xle(h),source:this.getSource()};r.push(f)}}processParsingErrors(e,r,n){for(let i of e.parserErrors){let a;if(isNaN(i.token.startOffset)){if("previousToken"in i){let s=i.previousToken;if(isNaN(s.startOffset)){let l={line:0,character:0};a={start:l,end:l}}else{let l={line:s.endLine-1,character:s.endColumn};a={start:l,end:l}}}}else a=Gm(i.token);if(a){let s={severity:RE("error"),range:a,message:i.message,data:bp(jo.ParsingError),source:this.getSource()};r.push(s)}}}processLinkingErrors(e,r,n){for(let i of e.references){let a=i.error;if(a){let s={node:a.container,property:a.property,index:a.index,data:{code:jo.LinkingError,containerType:a.container.$type,property:a.property,refText:a.reference.$refText}};r.push(this.toDiagnostic("error",a.message,s))}}}async validateAst(e,r,n=yr.CancellationToken.None){let i=[],a=o((s,l,u)=>{i.push(this.toDiagnostic(s,l,u))},"acceptor");return await this.validateAstBefore(e,r,a,n),await this.validateAstNodes(e,r,a,n),await this.validateAstAfter(e,r,a,n),i}async validateAstBefore(e,r,n,i=yr.CancellationToken.None){var a;let s=this.validationRegistry.checksBefore;for(let l of s)await xi(i),await l(e,n,(a=r.categories)!==null&&a!==void 0?a:[],i)}async validateAstNodes(e,r,n,i=yr.CancellationToken.None){await Promise.all(Wo(e).map(async a=>{await xi(i);let 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this.emitUpdate(e.map(s=>s.uri),[]),await this.buildDocuments(e,r,n)}async update(e,r,n=yr.CancellationToken.None){this.currentState=kn.Changed;for(let s of r)this.langiumDocuments.deleteDocument(s),this.buildState.delete(s.toString()),this.indexManager.remove(s);for(let s of e){if(!this.langiumDocuments.invalidateDocument(s)){let u=this.langiumDocumentFactory.fromModel({$type:"INVALID"},s);u.state=kn.Changed,this.langiumDocuments.addDocument(u)}this.buildState.delete(s.toString())}let i=en(e).concat(r).map(s=>s.toString()).toSet();this.langiumDocuments.all.filter(s=>!i.has(s.uri.toString())&&this.shouldRelink(s,i)).forEach(s=>{this.serviceRegistry.getServices(s.uri).references.Linker.unlink(s),s.state=Math.min(s.state,kn.ComputedScopes),s.diagnostics=void 0}),await this.emitUpdate(e,r),await xi(n);let a=this.sortDocuments(this.langiumDocuments.all.filter(s=>{var l;return s.staten(e,r)))}sortDocuments(e){let r=0,n=e.length-1;for(;r=0&&!this.hasTextDocument(e[n]);)n--;rn.error!==void 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n=r??{},i=r?.replacer,a=o((l,u)=>this.replacer(l,u,n),"defaultReplacer"),s=i?(l,u)=>i(l,u,a):a;try{return this.currentDocument=Pa(e),JSON.stringify(e,s,r?.space)}finally{this.currentDocument=void 0}}deserialize(e,r){let n=r??{},i=JSON.parse(e);return this.linkNode(i,i,n),i}replacer(e,r,{refText:n,sourceText:i,textRegions:a,comments:s,uriConverter:l}){var u,h,f,d;if(!this.ignoreProperties.has(e))if(va(r)){let p=r.ref,m=n?r.$refText:void 0;if(p){let g=Pa(p),y="";this.currentDocument&&this.currentDocument!==g&&(l?y=l(g.uri,r):y=g.uri.toString());let v=this.astNodeLocator.getAstNodePath(p);return{$ref:`${y}#${v}`,$refText:m}}else return{$error:(h=(u=r.error)===null||u===void 0?void 0:u.message)!==null&&h!==void 0?h:"Could not resolve reference",$refText:m}}else if(ii(r)){let p;if(a&&(p=this.addAstNodeRegionWithAssignmentsTo(Object.assign({},r)),(!e||r.$document)&&p?.$textRegion&&(p.$textRegion.documentURI=(f=this.currentDocument)===null||f===void 0?void 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Map,this.currentState=kn.Changed,this.langiumDocuments=e.workspace.LangiumDocuments,this.langiumDocumentFactory=e.workspace.LangiumDocumentFactory,this.textDocuments=e.workspace.TextDocuments,this.indexManager=e.workspace.IndexManager,this.serviceRegistry=e.ServiceRegistry}async build(e,r={},n=yr.CancellationToken.None){var i,a;for(let s of e){let l=s.uri.toString();if(s.state===kn.Validated){if(typeof r.validation=="boolean"&&r.validation)s.state=kn.IndexedReferences,s.diagnostics=void 0,this.buildState.delete(l);else if(typeof r.validation=="object"){let u=this.buildState.get(l),h=(i=u?.result)===null||i===void 0?void 0:i.validationChecks;if(h){let d=((a=r.validation.categories)!==null&&a!==void 0?a:E1.all).filter(p=>!h.includes(p));d.length>0&&(this.buildState.set(l,{completed:!1,options:{validation:Object.assign(Object.assign({},r.validation),{categories:d})},result:u.result}),s.state=kn.IndexedReferences)}}}else this.buildState.delete(l)}this.currentState=kn.Changed,await 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You can only invoke reject() in the lexer when the lexer is of the backtracking persuasion (options.backtrack_lexer = true). -`+this.showPosition(),{text:"",token:null,line:this.yylineno});return this},"reject"),less:o(function(q){this.unput(this.match.slice(q))},"less"),pastInput:o(function(){var q=this.matched.substr(0,this.matched.length-this.match.length);return(q.length>20?"...":"")+q.substr(-20).replace(/\n/g,"")},"pastInput"),upcomingInput:o(function(){var q=this.match;return q.length<20&&(q+=this._input.substr(0,20-q.length)),(q.substr(0,20)+(q.length>20?"...":"")).replace(/\n/g,"")},"upcomingInput"),showPosition:o(function(){var q=this.pastInput(),pe=new Array(q.length+1).join("-");return q+this.upcomingInput()+` -`+pe+"^"},"showPosition"),test_match:o(function(q,pe){var ve,Pe,_e;if(this.options.backtrack_lexer&&(_e={yylineno:this.yylineno,yylloc:{first_line:this.yylloc.first_line,last_line:this.last_line,first_column:this.yylloc.first_column,last_column:this.yylloc.last_column},yytext:this.yytext,match:this.match,matches:this.matches,matched:this.matched,yyleng:this.yyleng,offset:this.offset,_more:this._more,_input:this._input,yy:this.yy,conditionStack:this.conditionStack.slice(0),done:this.done},this.options.ranges&&(_e.yylloc.range=this.yylloc.range.slice(0))),Pe=q[0].match(/(?:\r\n?|\n).*/g),Pe&&(this.yylineno+=Pe.length),this.yylloc={first_line:this.yylloc.last_line,last_line:this.yylineno+1,first_column:this.yylloc.last_column,last_column:Pe?Pe[Pe.length-1].length-Pe[Pe.length-1].match(/\r?\n?/)[0].length:this.yylloc.last_column+q[0].length},this.yytext+=q[0],this.match+=q[0],this.matches=q,this.yyleng=this.yytext.length,this.options.ranges&&(this.yylloc.range=[this.offset,this.offset+=this.yyleng]),this._more=!1,this._backtrack=!1,this._input=this._input.slice(q[0].length),this.matched+=q[0],ve=this.performAction.call(this,this.yy,this,pe,this.conditionStack[this.conditionStack.length-1]),this.done&&this._input&&(this.done=!1),ve)return ve;if(this._backtrack){for(var we in _e)this[we]=_e[we];return!1}return!1},"test_match"),next:o(function(){if(this.done)return this.EOF;this._input||(this.done=!0);var q,pe,ve,Pe;this._more||(this.yytext="",this.match="");for(var _e=this._currentRules(),we=0;we<_e.length;we++)if(ve=this._input.match(this.rules[_e[we]]),ve&&(!pe||ve[0].length>pe[0].length)){if(pe=ve,Pe=we,this.options.backtrack_lexer){if(q=this.test_match(ve,_e[we]),q!==!1)return q;if(this._backtrack){pe=!1;continue}else return!1}else if(!this.options.flex)break}return pe?(q=this.test_match(pe,_e[Pe]),q!==!1?q:!1):this._input===""?this.EOF:this.parseError("Lexical error on line "+(this.yylineno+1)+`. Unrecognized text. -`+this.showPosition(),{text:"",token:null,line:this.yylineno})},"next"),lex:o(function(){var pe=this.next();return pe||this.lex()},"lex"),begin:o(function(pe){this.conditionStack.push(pe)},"begin"),popState:o(function(){var pe=this.conditionStack.length-1;return pe>0?this.conditionStack.pop():this.conditionStack[0]},"popState"),_currentRules:o(function(){return this.conditionStack.length&&this.conditionStack[this.conditionStack.length-1]?this.conditions[this.conditionStack[this.conditionStack.length-1]].rules:this.conditions.INITIAL.rules},"_currentRules"),topState:o(function(pe){return pe=this.conditionStack.length-1-Math.abs(pe||0),pe>=0?this.conditionStack[pe]:"INITIAL"},"topState"),pushState:o(function(pe){this.begin(pe)},"pushState"),stateStackSize:o(function(){return this.conditionStack.length},"stateStackSize"),options:{"case-insensitive":!0},performAction:o(function(pe,ve,Pe,_e){var we=_e;switch(Pe){case 0:break;case 1:break;case 2:return 55;case 3:break;case 4:return this.begin("title"),35;break;case 5:return this.popState(),"title_value";break;case 6:return this.begin("acc_title"),37;break;case 7:return this.popState(),"acc_title_value";break;case 8:return this.begin("acc_descr"),39;break;case 9:return this.popState(),"acc_descr_value";break;case 10:this.begin("acc_descr_multiline");break;case 11:this.popState();break;case 12:return"acc_descr_multiline_value";case 13:return 48;case 14:return 50;case 15:return 49;case 16:return 51;case 17:return 52;case 18:return 53;case 19:return 54;case 20:return 25;case 21:this.begin("md_string");break;case 22:return"MD_STR";case 23:this.popState();break;case 24:this.begin("string");break;case 25:this.popState();break;case 26:return"STR";case 27:this.begin("class_name");break;case 28:return this.popState(),47;break;case 29:return this.begin("point_start"),44;break;case 30:return this.begin("point_x"),45;break;case 31:this.popState();break;case 32:this.popState(),this.begin("point_y");break;case 33:return this.popState(),46;break;case 34:return 28;case 35:return 4;case 36:return 11;case 37:return 64;case 38:return 10;case 39:return 65;case 40:return 65;case 41:return 14;case 42:return 13;case 43:return 67;case 44:return 66;case 45:return 12;case 46:return 8;case 47:return 5;case 48:return 18;case 49:return 56;case 50:return 63;case 51:return 57}},"anonymous"),rules:[/^(?:%%(?!\{)[^\n]*)/i,/^(?:[^\}]%%[^\n]*)/i,/^(?:[\n\r]+)/i,/^(?:%%[^\n]*)/i,/^(?:title\b)/i,/^(?:(?!\n||)*[^\n]*)/i,/^(?:accTitle\s*:\s*)/i,/^(?:(?!\n||)*[^\n]*)/i,/^(?:accDescr\s*:\s*)/i,/^(?:(?!\n||)*[^\n]*)/i,/^(?:accDescr\s*\{\s*)/i,/^(?:[\}])/i,/^(?:[^\}]*)/i,/^(?: *x-axis *)/i,/^(?: *y-axis *)/i,/^(?: *--+> *)/i,/^(?: *quadrant-1 *)/i,/^(?: *quadrant-2 *)/i,/^(?: *quadrant-3 *)/i,/^(?: *quadrant-4 *)/i,/^(?:classDef\b)/i,/^(?:["][`])/i,/^(?:[^`"]+)/i,/^(?:[`]["])/i,/^(?:["])/i,/^(?:["])/i,/^(?:[^"]*)/i,/^(?::::)/i,/^(?:^\w+)/i,/^(?:\s*:\s*\[\s*)/i,/^(?:(1)|(0(.\d+)?))/i,/^(?:\s*\] *)/i,/^(?:\s*,\s*)/i,/^(?:(1)|(0(.\d+)?))/i,/^(?: *quadrantChart *)/i,/^(?:[A-Za-z]+)/i,/^(?::)/i,/^(?:\+)/i,/^(?:,)/i,/^(?:=)/i,/^(?:=)/i,/^(?:\*)/i,/^(?:#)/i,/^(?:[\_])/i,/^(?:\.)/i,/^(?:&)/i,/^(?:-)/i,/^(?:[0-9]+)/i,/^(?:\s)/i,/^(?:;)/i,/^(?:[!"#$%&'*+,-.`?\\_/])/i,/^(?:$)/i],conditions:{class_name:{rules:[28],inclusive:!1},point_y:{rules:[33],inclusive:!1},point_x:{rules:[32],inclusive:!1},point_start:{rules:[30,31],inclusive:!1},acc_descr_multiline:{rules:[11,12],inclusive:!1},acc_descr:{rules:[9],inclusive:!1},acc_title:{rules:[7],inclusive:!1},title:{rules:[5],inclusive:!1},md_string:{rules:[22,23],inclusive:!1},string:{rules:[25,26],inclusive:!1},INITIAL:{rules:[0,1,2,3,4,6,8,10,13,14,15,16,17,18,19,20,21,24,27,29,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,49,50,51],inclusive:!0}}};return xe}();re.lexer=oe;function V(){this.yy={}}return o(V,"Parser"),V.prototype=re,re.Parser=V,new V}();hO.parser=hO;uhe=hO});var ms,y6,fhe=N(()=>{"use strict";dr();Ya();vt();_y();ms=oh(),y6=class{constructor(){this.classes=new Map;this.config=this.getDefaultConfig(),this.themeConfig=this.getDefaultThemeConfig(),this.data=this.getDefaultData()}static{o(this,"QuadrantBuilder")}getDefaultData(){return{titleText:"",quadrant1Text:"",quadrant2Text:"",quadrant3Text:"",quadrant4Text:"",xAxisLeftText:"",xAxisRightText:"",yAxisBottomText:"",yAxisTopText:"",points:[]}}getDefaultConfig(){return{showXAxis:!0,showYAxis:!0,showTitle:!0,chartHeight:or.quadrantChart?.chartWidth||500,chartWidth:or.quadrantChart?.chartHeight||500,titlePadding:or.quadrantChart?.titlePadding||10,titleFontSize:or.quadrantChart?.titleFontSize||20,quadrantPadding:or.quadrantChart?.quadrantPadding||5,xAxisLabelPadding:or.quadrantChart?.xAxisLabelPadding||5,yAxisLabelPadding:or.quadrantChart?.yAxisLabelPadding||5,xAxisLabelFontSize:or.quadrantChart?.xAxisLabelFontSize||16,yAxisLabelFontSize:or.quadrantChart?.yAxisLabelFontSize||16,quadrantLabelFontSize:or.quadrantChart?.quadrantLabelFontSize||16,quadrantTextTopPadding:or.quadrantChart?.quadrantTextTopPadding||5,pointTextPadding:or.quadrantChart?.pointTextPadding||5,pointLabelFontSize:or.quadrantChart?.pointLabelFontSize||12,pointRadius:or.quadrantChart?.pointRadius||5,xAxisPosition:or.quadrantChart?.xAxisPosition||"top",yAxisPosition:or.quadrantChart?.yAxisPosition||"left",quadrantInternalBorderStrokeWidth:or.quadrantChart?.quadrantInternalBorderStrokeWidth||1,quadrantExternalBorderStrokeWidth:or.quadrantChart?.quadrantExternalBorderStrokeWidth||2}}getDefaultThemeConfig(){return{quadrant1Fill:ms.quadrant1Fill,quadrant2Fill:ms.quadrant2Fill,quadrant3Fill:ms.quadrant3Fill,quadrant4Fill:ms.quadrant4Fill,quadrant1TextFill:ms.quadrant1TextFill,quadrant2TextFill:ms.quadrant2TextFill,quadrant3TextFill:ms.quadrant3TextFill,quadrant4TextFill:ms.quadrant4TextFill,quadrantPointFill:ms.quadrantPointFill,quadrantPointTextFill:ms.quadrantPointTextFill,quadrantXAxisTextFill:ms.quadrantXAxisTextFill,quadrantYAxisTextFill:ms.quadrantYAxisTextFill,quadrantTitleFill:ms.quadrantTitleFill,quadrantInternalBorderStrokeFill:ms.quadrantInternalBorderStrokeFill,quadrantExternalBorderStrokeFill:ms.quadrantExternalBorderStrokeFill}}clear(){this.config=this.getDefaultConfig(),this.themeConfig=this.getDefaultThemeConfig(),this.data=this.getDefaultData(),this.classes=new Map,Y.info("clear called")}setData(e){this.data={...this.data,...e}}addPoints(e){this.data.points=[...e,...this.data.points]}addClass(e,r){this.classes.set(e,r)}setConfig(e){Y.trace("setConfig called with: ",e),this.config={...this.config,...e}}setThemeConfig(e){Y.trace("setThemeConfig called with: ",e),this.themeConfig={...this.themeConfig,...e}}calculateSpace(e,r,n,i){let a=this.config.xAxisLabelPadding*2+this.config.xAxisLabelFontSize,s={top:e==="top"&&r?a:0,bottom:e==="bottom"&&r?a:0},l=this.config.yAxisLabelPadding*2+this.config.yAxisLabelFontSize,u={left:this.config.yAxisPosition==="left"&&n?l:0,right:this.config.yAxisPosition==="right"&&n?l:0},h=this.config.titleFontSize+this.config.titlePadding*2,f={top:i?h:0},d=this.config.quadrantPadding+u.left,p=this.config.quadrantPadding+s.top+f.top,m=this.config.chartWidth-this.config.quadrantPadding*2-u.left-u.right,g=this.config.chartHeight-this.config.quadrantPadding*2-s.top-s.bottom-f.top,y=m/2,v=g/2;return{xAxisSpace:s,yAxisSpace:u,titleSpace:f,quadrantSpace:{quadrantLeft:d,quadrantTop:p,quadrantWidth:m,quadrantHalfWidth:y,quadrantHeight:g,quadrantHalfHeight:v}}}getAxisLabels(e,r,n,i){let{quadrantSpace:a,titleSpace:s}=i,{quadrantHalfHeight:l,quadrantHeight:u,quadrantLeft:h,quadrantHalfWidth:f,quadrantTop:d,quadrantWidth:p}=a,m=!!this.data.xAxisRightText,g=!!this.data.yAxisTopText,y=[];return this.data.xAxisLeftText&&r&&y.push({text:this.data.xAxisLeftText,fill:this.themeConfig.quadrantXAxisTextFill,x:h+(m?f/2:0),y:e==="top"?this.config.xAxisLabelPadding+s.top:this.config.xAxisLabelPadding+d+u+this.config.quadrantPadding,fontSize:this.config.xAxisLabelFontSize,verticalPos:m?"center":"left",horizontalPos:"top",rotation:0}),this.data.xAxisRightText&&r&&y.push({text:this.data.xAxisRightText,fill:this.themeConfig.quadrantXAxisTextFill,x:h+f+(m?f/2:0),y:e==="top"?this.config.xAxisLabelPadding+s.top:this.config.xAxisLabelPadding+d+u+this.config.quadrantPadding,fontSize:this.config.xAxisLabelFontSize,verticalPos:m?"center":"left",horizontalPos:"top",rotation:0}),this.data.yAxisBottomText&&n&&y.push({text:this.data.yAxisBottomText,fill:this.themeConfig.quadrantYAxisTextFill,x:this.config.yAxisPosition==="left"?this.config.yAxisLabelPadding:this.config.yAxisLabelPadding+h+p+this.config.quadrantPadding,y:d+u-(g?l/2:0),fontSize:this.config.yAxisLabelFontSize,verticalPos:g?"center":"left",horizontalPos:"top",rotation:-90}),this.data.yAxisTopText&&n&&y.push({text:this.data.yAxisTopText,fill:this.themeConfig.quadrantYAxisTextFill,x:this.config.yAxisPosition==="left"?this.config.yAxisLabelPadding:this.config.yAxisLabelPadding+h+p+this.config.quadrantPadding,y:d+l-(g?l/2:0),fontSize:this.config.yAxisLabelFontSize,verticalPos:g?"center":"left",horizontalPos:"top",rotation:-90}),y}getQuadrants(e){let{quadrantSpace:r}=e,{quadrantHalfHeight:n,quadrantLeft:i,quadrantHalfWidth:a,quadrantTop:s}=r,l=[{text:{text:this.data.quadrant1Text,fill:this.themeConfig.quadrant1TextFill,x:0,y:0,fontSize:this.config.quadrantLabelFontSize,verticalPos:"center",horizontalPos:"middle",rotation:0},x:i+a,y:s,width:a,height:n,fill:this.themeConfig.quadrant1Fill},{text:{text:this.data.quadrant2Text,fill:this.themeConfig.quadrant2TextFill,x:0,y:0,fontSize:this.config.quadrantLabelFontSize,verticalPos:"center",horizontalPos:"middle",rotation:0},x:i,y:s,width:a,height:n,fill:this.themeConfig.quadrant2Fill},{text:{text:this.data.quadrant3Text,fill:this.themeConfig.quadrant3TextFill,x:0,y:0,fontSize:this.config.quadrantLabelFontSize,verticalPos:"center",horizontalPos:"middle",rotation:0},x:i,y:s+n,width:a,height:n,fill:this.themeConfig.quadrant3Fill},{text:{text:this.data.quadrant4Text,fill:this.themeConfig.quadrant4TextFill,x:0,y:0,fontSize:this.config.quadrantLabelFontSize,verticalPos:"center",horizontalPos:"middle",rotation:0},x:i+a,y:s+n,width:a,height:n,fill:this.themeConfig.quadrant4Fill}];for(let u of l)u.text.x=u.x+u.width/2,this.data.points.length===0?(u.text.y=u.y+u.height/2,u.text.horizontalPos="middle"):(u.text.y=u.y+this.config.quadrantTextTopPadding,u.text.horizontalPos="top");return l}getQuadrantPoints(e){let{quadrantSpace:r}=e,{quadrantHeight:n,quadrantLeft:i,quadrantTop:a,quadrantWidth:s}=r,l=gl().domain([0,1]).range([i,s+i]),u=gl().domain([0,1]).range([n+a,a]);return this.data.points.map(f=>{let d=this.classes.get(f.className);return d&&(f={...d,...f}),{x:l(f.x),y:u(f.y),fill:f.color??this.themeConfig.quadrantPointFill,radius:f.radius??this.config.pointRadius,text:{text:f.text,fill:this.themeConfig.quadrantPointTextFill,x:l(f.x),y:u(f.y)+this.config.pointTextPadding,verticalPos:"center",horizontalPos:"top",fontSize:this.config.pointLabelFontSize,rotation:0},strokeColor:f.strokeColor??this.themeConfig.quadrantPointFill,strokeWidth:f.strokeWidth??"0px"}})}getBorders(e){let r=this.config.quadrantExternalBorderStrokeWidth/2,{quadrantSpace:n}=e,{quadrantHalfHeight:i,quadrantHeight:a,quadrantLeft:s,quadrantHalfWidth:l,quadrantTop:u,quadrantWidth:h}=n;return[{strokeFill:this.themeConfig.quadrantExternalBorderStrokeFill,strokeWidth:this.config.quadrantExternalBorderStrokeWidth,x1:s-r,y1:u,x2:s+h+r,y2:u},{strokeFill:this.themeConfig.quadrantExternalBorderStrokeFill,strokeWidth:this.config.quadrantExternalBorderStrokeWidth,x1:s+h,y1:u+r,x2:s+h,y2:u+a-r},{strokeFill:this.themeConfig.quadrantExternalBorderStrokeFill,strokeWidth:this.config.quadrantExternalBorderStrokeWidth,x1:s-r,y1:u+a,x2:s+h+r,y2:u+a},{strokeFill:this.themeConfig.quadrantExternalBorderStrokeFill,strokeWidth:this.config.quadrantExternalBorderStrokeWidth,x1:s,y1:u+r,x2:s,y2:u+a-r},{strokeFill:this.themeConfig.quadrantInternalBorderStrokeFill,strokeWidth:this.config.quadrantInternalBorderStrokeWidth,x1:s+l,y1:u+r,x2:s+l,y2:u+a-r},{strokeFill:this.themeConfig.quadrantInternalBorderStrokeFill,strokeWidth:this.config.quadrantInternalBorderStrokeWidth,x1:s+r,y1:u+i,x2:s+h-r,y2:u+i}]}getTitle(e){if(e)return{text:this.data.titleText,fill:this.themeConfig.quadrantTitleFill,fontSize:this.config.titleFontSize,horizontalPos:"top",verticalPos:"center",rotation:0,y:this.config.titlePadding,x:this.config.chartWidth/2}}build(){let e=this.config.showXAxis&&!!(this.data.xAxisLeftText||this.data.xAxisRightText),r=this.config.showYAxis&&!!(this.data.yAxisTopText||this.data.yAxisBottomText),n=this.config.showTitle&&!!this.data.titleText,i=this.data.points.length>0?"bottom":this.config.xAxisPosition,a=this.calculateSpace(i,e,r,n);return{points:this.getQuadrantPoints(a),quadrants:this.getQuadrants(a),axisLabels:this.getAxisLabels(i,e,r,a),borderLines:this.getBorders(a),title:this.getTitle(n)}}}});function fO(t){return!/^#?([\dA-Fa-f]{6}|[\dA-Fa-f]{3})$/.test(t)}function dhe(t){return!/^\d+$/.test(t)}function phe(t){return!/^\d+px$/.test(t)}var Ap,mhe=N(()=>{"use strict";Ap=class extends Error{static{o(this,"InvalidStyleError")}constructor(e,r,n){super(`value for ${e} ${r} is invalid, please use a valid ${n}`),this.name="InvalidStyleError"}};o(fO,"validateHexCode");o(dhe,"validateNumber");o(phe,"validateSizeInPixels")});function Xu(t){return Tr(t.trim(),pGe)}function mGe(t){ba.setData({quadrant1Text:Xu(t.text)})}function gGe(t){ba.setData({quadrant2Text:Xu(t.text)})}function yGe(t){ba.setData({quadrant3Text:Xu(t.text)})}function vGe(t){ba.setData({quadrant4Text:Xu(t.text)})}function xGe(t){ba.setData({xAxisLeftText:Xu(t.text)})}function bGe(t){ba.setData({xAxisRightText:Xu(t.text)})}function wGe(t){ba.setData({yAxisTopText:Xu(t.text)})}function TGe(t){ba.setData({yAxisBottomText:Xu(t.text)})}function dO(t){let e={};for(let r of t){let[n,i]=r.trim().split(/\s*:\s*/);if(n==="radius"){if(dhe(i))throw new Ap(n,i,"number");e.radius=parseInt(i)}else if(n==="color"){if(fO(i))throw new Ap(n,i,"hex code");e.color=i}else if(n==="stroke-color"){if(fO(i))throw new Ap(n,i,"hex code");e.strokeColor=i}else if(n==="stroke-width"){if(phe(i))throw new Ap(n,i,"number of pixels (eg. 10px)");e.strokeWidth=i}else throw new Error(`style named ${n} is not supported.`)}return e}function kGe(t,e,r,n,i){let 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this.textDimensionCalculator.getMaxDimension(this.getTickValues().map(e=>e.toString()),this.axisConfig.labelFontSize)}recalculateOuterPaddingToDrawBar(){.7*this.getTickDistance()>this.outerPadding*2&&(this.outerPadding=Math.floor(.7*this.getTickDistance()/2)),this.recalculateScale()}calculateSpaceIfDrawnHorizontally(e){let r=e.height;if(this.axisConfig.showAxisLine&&r>this.axisConfig.axisLineWidth&&(r-=this.axisConfig.axisLineWidth,this.showAxisLine=!0),this.axisConfig.showLabel){let n=this.getLabelDimension(),i=.2*e.width;this.outerPadding=Math.min(n.width/2,i);let a=n.height+this.axisConfig.labelPadding*2;this.labelTextHeight=n.height,a<=r&&(r-=a,this.showLabel=!0)}if(this.axisConfig.showTick&&r>=this.axisConfig.tickLength&&(this.showTick=!0,r-=this.axisConfig.tickLength),this.axisConfig.showTitle&&this.title){let n=this.textDimensionCalculator.getMaxDimension([this.title],this.axisConfig.titleFontSize),i=n.height+this.axisConfig.titlePadding*2;this.titleTextHeight=n.height,i<=r&&(r-=i,this.showTitle=!0)}this.boundingRect.width=e.width,this.boundingRect.height=e.height-r}calculateSpaceIfDrawnVertical(e){let r=e.width;if(this.axisConfig.showAxisLine&&r>this.axisConfig.axisLineWidth&&(r-=this.axisConfig.axisLineWidth,this.showAxisLine=!0),this.axisConfig.showLabel){let n=this.getLabelDimension(),i=.2*e.height;this.outerPadding=Math.min(n.height/2,i);let a=n.width+this.axisConfig.labelPadding*2;a<=r&&(r-=a,this.showLabel=!0)}if(this.axisConfig.showTick&&r>=this.axisConfig.tickLength&&(this.showTick=!0,r-=this.axisConfig.tickLength),this.axisConfig.showTitle&&this.title){let n=this.textDimensionCalculator.getMaxDimension([this.title],this.axisConfig.titleFontSize),i=n.height+this.axisConfig.titlePadding*2;this.titleTextHeight=n.height,i<=r&&(r-=i,this.showTitle=!0)}this.boundingRect.width=e.width-r,this.boundingRect.height=e.height}calculateSpace(e){return this.axisPosition==="left"||this.axisPosition==="right"?this.calculateSpaceIfDrawnVertical(e):this.calculateSpaceIfDrawnHorizontally(e),this.recalculateScale(),{width:this.boundingRect.width,height:this.boundingRect.height}}setBoundingBoxXY(e){this.boundingRect.x=e.x,this.boundingRect.y=e.y}getDrawableElementsForLeftAxis(){let e=[];if(this.showAxisLine){let r=this.boundingRect.x+this.boundingRect.width-this.axisConfig.axisLineWidth/2;e.push({type:"path",groupTexts:["left-axis","axisl-line"],data:[{path:`M ${r},${this.boundingRect.y} L ${r},${this.boundingRect.y+this.boundingRect.height} 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this.showTitle&&e.push({type:"text",groupTexts:["left-axis","title"],data:[{text:this.title,x:this.boundingRect.x+this.axisConfig.titlePadding,y:this.boundingRect.y+this.boundingRect.height/2,fill:this.axisThemeConfig.titleColor,fontSize:this.axisConfig.titleFontSize,rotation:270,verticalPos:"top",horizontalPos:"center"}]}),e}getDrawableElementsForBottomAxis(){let e=[];if(this.showAxisLine){let r=this.boundingRect.y+this.axisConfig.axisLineWidth/2;e.push({type:"path",groupTexts:["bottom-axis","axis-line"],data:[{path:`M ${this.boundingRect.x},${r} L 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this.showTitle&&e.push({type:"text",groupTexts:["bottom-axis","title"],data:[{text:this.title,x:this.range[0]+(this.range[1]-this.range[0])/2,y:this.boundingRect.y+this.boundingRect.height-this.axisConfig.titlePadding-this.titleTextHeight,fill:this.axisThemeConfig.titleColor,fontSize:this.axisConfig.titleFontSize,rotation:0,verticalPos:"top",horizontalPos:"center"}]}),e}getDrawableElementsForTopAxis(){let e=[];if(this.showAxisLine){let r=this.boundingRect.y+this.boundingRect.height-this.axisConfig.axisLineWidth/2;e.push({type:"path",groupTexts:["top-axis","axis-line"],data:[{path:`M ${this.boundingRect.x},${r} L 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68:this.$=ve[_e-1]+ve[_e];break}},"anonymous"),table:[{3:1,4:2,6:e,9:r,11:n,13:i},{1:[3]},{3:8,4:2,5:[1,7],6:e,9:r,11:n,13:i},{5:[1,9]},{10:[1,10]},{12:[1,11]},t(a,[2,6]),{3:12,4:2,6:e,9:r,11:n,13:i},{1:[2,2]},{4:17,5:s,7:13,8:l,9:r,11:n,13:i,14:14,15:15,16:16,17:18,18:19,19:20,20:21,21:u,22:h,23:f,24:d,25:23,33:25,41:p,42:m,43:g,44:y,45:v,46:x,54:b,72:w,74:C,77:T,89:E,90:A},t(a,[2,4]),t(a,[2,5]),{1:[2,1]},{8:[1,41]},{4:17,5:s,7:42,8:l,9:r,11:n,13:i,14:14,15:15,16:16,17:18,18:19,19:20,20:21,21:u,22:h,23:f,24:d,25:23,33:25,41:p,42:m,43:g,44:y,45:v,46:x,54:b,72:w,74:C,77:T,89:E,90:A},{4:17,5:s,7:43,8:l,9:r,11:n,13:i,14:14,15:15,16:16,17:18,18:19,19:20,20:21,21:u,22:h,23:f,24:d,25:23,33:25,41:p,42:m,43:g,44:y,45:v,46:x,54:b,72:w,74:C,77:T,89:E,90:A},{4:17,5:s,7:44,8:l,9:r,11:n,13:i,14:14,15:15,16:16,17:18,18:19,19:20,20:21,21:u,22:h,23:f,24:d,25:23,33:25,41:p,42:m,43:g,44:y,45:v,46:x,54:b,72:w,74:C,77:T,89:E,90:A},{4:17,5:s,7:45,8:l,9:r,11:n,13:i,14:14,15:15,16:16,17:18,18:19,19:20,20:21,21:u,22:h,23:f,24:d,25:23,33:25,41:p,42:m,43:g,44:y,45:v,46:x,54:b,72:w,74:C,77:T,89:E,90:A},{4:17,5:s,7:46,8:l,9:r,11:n,13:i,14:14,15:15,16:16,17:18,18:19,19:20,20:21,21:u,22:h,23:f,24:d,25:23,33:25,41:p,42:m,43:g,44:y,45:v,46:x,54:b,72:w,74:C,77:T,89:E,90:A},{4:17,5:s,7:47,8:l,9:r,11:n,13:i,14:14,15:15,16:16,17:18,18:19,19:20,20:21,21:u,22:h,23:f,24:d,25:23,33:25,41:p,42:m,43:g,44:y,45:v,46:x,54:b,72:w,74:C,77:T,89:E,90:A},{4:17,5:s,7:48,8:l,9:r,11:n,13:i,14:14,15:15,16:16,17:18,18:19,19:20,20:21,21:u,22:h,23:f,24:d,25:23,33:25,41:p,42:m,43:g,44:y,45:v,46:x,54:b,72:w,74:C,77:T,89:E,90:A},{4:17,5:s,7:49,8:l,9:r,11:n,13:i,14:14,15:15,16:16,17:18,18:19,19:20,20:21,21:u,22:h,23:f,24:d,25:23,33:25,41:p,42:m,43:g,44:y,45:v,46:x,54:b,72:w,74:C,77:T,89:E,90:A},{4:17,5:s,7:50,8:l,9:r,11:n,13:i,14:14,15:15,16:16,17:18,18:19,19:20,20:21,21:u,22:h,23:f,24:d,25:23,33:25,41:p,42:m,43:g,44:y,45:v,46:x,54:b,72:w,74:C,77:T,89:E,90:A},{26:51,89:[1,52],90:[1,53]},{55:54,89:[1,55],90:[1,56]},{29:[1,59],61:[1,57],63:[1,58]},t(S,[2,17]),t(S,[2,18]),t(S,[2,19]),t(S,[2,20]),{30:60,33:62,75:_,89:E,90:A},{30:63,33:62,75:_,89:E,90:A},{30:64,33:62,75:_,89:E,90:A},t(I,[2,29]),t(I,[2,30]),t(I,[2,31]),t(I,[2,32]),t(I,[2,33]),t(I,[2,34]),t(D,[2,81]),t(D,[2,82]),{1:[2,3]},{8:[2,8]},{8:[2,9]},{8:[2,10]},{8:[2,11]},{8:[2,12]},{8:[2,13]},{8:[2,14]},{8:[2,15]},{8:[2,16]},{27:[1,65],29:[1,66]},t(k,[2,79]),t(k,[2,80]),{27:[1,67],29:[1,68]},t(k,[2,85]),t(k,[2,86]),{62:69,65:L,66:R,67:O,68:M,69:B,70:F,71:P},{62:77,65:L,66:R,67:O,68:M,69:B,70:F,71:P},{30:78,33:62,75:_,89:E,90:A},{73:79,75:z,76:$,78:81,79:82,80:H,81:Q,82:j,83:ie,84:ne,85:le,86:he,87:K,88:X},t(te,[2,60]),t(te,[2,62]),{73:93,75:z,76:$,78:81,79:82,80:H,81:Q,82:j,83:ie,84:ne,85:le,86:he,87:K,88:X},{30:94,33:62,75:_,76:$,89:E,90:A},{5:[1,95]},{30:96,33:62,75:_,89:E,90:A},{5:[1,97]},{30:98,33:62,75:_,89:E,90:A},{63:[1,99]},t(J,[2,50]),t(J,[2,51]),t(J,[2,52]),t(J,[2,53]),t(J,[2,54]),t(J,[2,55]),t(J,[2,56]),{64:[1,100]},t(S,[2,59],{76:$}),t(S,[2,64],{76:se}),{33:103,75:[1,102],89:E,90:A},t(ue,[2,65],{79:104,75:z,80:H,81:Q,82:j,83:ie,84:ne,85:le,86:he,87:K,88:X}),t(Z,[2,67]),t(Z,[2,69]),t(Z,[2,70]),t(Z,[2,71]),t(Z,[2,72]),t(Z,[2,73]),t(Z,[2,74]),t(Z,[2,75]),t(Z,[2,76]),t(Z,[2,77]),t(Z,[2,78]),t(S,[2,57],{76:se}),t(S,[2,58],{76:$}),{5:Se,28:105,31:ce,34:ae,36:Oe,38:ge,40:ze},{27:[1,112],76:$},{5:He,40:$e,56:113,57:Re,59:Ie},{27:[1,118],76:$},{33:119,89:E,90:A},{33:120,89:E,90:A},{75:z,78:121,79:82,80:H,81:Q,82:j,83:ie,84:ne,85:le,86:he,87:K,88:X},t(te,[2,61]),t(te,[2,63]),t(Z,[2,68]),t(S,[2,21]),{32:[1,122]},{32:[1,123]},{32:[1,124]},{32:[1,125]},{5:Se,28:126,31:ce,34:ae,36:Oe,38:ge,40:ze},t(S,[2,28]),{5:[1,127]},t(S,[2,42]),{32:[1,128]},{32:[1,129]},{5:He,40:$e,56:130,57:Re,59:Ie},t(S,[2,47]),{5:[1,131]},t(S,[2,48]),t(S,[2,49]),t(ue,[2,66],{79:104,75:z,80:H,81:Q,82:j,83:ie,84:ne,85:le,86:he,87:K,88:X}),{33:132,89:E,90:A},{35:133,89:[1,134],90:[1,135]},{37:136,47:[1,137],48:[1,138],49:[1,139]},{39:140,50:[1,141],51:[1,142],52:[1,143],53:[1,144]},t(S,[2,27]),{5:Se,28:145,31:ce,34:ae,36:Oe,38:ge,40:ze},{58:146,89:[1,147],90:[1,148]},{60:149,89:[1,150],90:[1,151]},t(S,[2,46]),{5:He,40:$e,56:152,57:Re,59:Ie},{5:[1,153]},{5:[1,154]},{5:[2,83]},{5:[2,84]},{5:[1,155]},{5:[2,35]},{5:[2,36]},{5:[2,37]},{5:[1,156]},{5:[2,38]},{5:[2,39]},{5:[2,40]},{5:[2,41]},t(S,[2,22]),{5:[1,157]},{5:[2,87]},{5:[2,88]},{5:[1,158]},{5:[2,89]},{5:[2,90]},t(S,[2,43]),{5:Se,28:159,31:ce,34:ae,36:Oe,38:ge,40:ze},{5:Se,28:160,31:ce,34:ae,36:Oe,38:ge,40:ze},{5:Se,28:161,31:ce,34:ae,36:Oe,38:ge,40:ze},{5:Se,28:162,31:ce,34:ae,36:Oe,38:ge,40:ze},{5:He,40:$e,56:163,57:Re,59:Ie},{5:He,40:$e,56:164,57:Re,59:Ie},t(S,[2,23]),t(S,[2,24]),t(S,[2,25]),t(S,[2,26]),t(S,[2,44]),t(S,[2,45])],defaultActions:{8:[2,2],12:[2,1],41:[2,3],42:[2,8],43:[2,9],44:[2,10],45:[2,11],46:[2,12],47:[2,13],48:[2,14],49:[2,15],50:[2,16],134:[2,83],135:[2,84],137:[2,35],138:[2,36],139:[2,37],141:[2,38],142:[2,39],143:[2,40],144:[2,41],147:[2,87],148:[2,88],150:[2,89],151:[2,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xe=new Error(oe);throw xe.hash=V,xe}},"parseError"),parse:o(function(oe){var V=this,xe=[0],q=[],pe=[null],ve=[],Pe=this.table,_e="",we=0,Ve=0,De=0,qe=2,at=1,Rt=ve.slice.call(arguments,1),st=Object.create(this.lexer),Ue={yy:{}};for(var ct in this.yy)Object.prototype.hasOwnProperty.call(this.yy,ct)&&(Ue.yy[ct]=this.yy[ct]);st.setInput(oe,Ue.yy),Ue.yy.lexer=st,Ue.yy.parser=this,typeof st.yylloc>"u"&&(st.yylloc={});var We=st.yylloc;ve.push(We);var ot=st.options&&st.options.ranges;typeof Ue.yy.parseError=="function"?this.parseError=Ue.yy.parseError:this.parseError=Object.getPrototypeOf(this).parseError;function Yt(Dr){xe.length=xe.length-2*Dr,pe.length=pe.length-Dr,ve.length=ve.length-Dr}o(Yt,"popStack");function bt(){var Dr;return Dr=q.pop()||st.lex()||at,typeof Dr!="number"&&(Dr instanceof Array&&(q=Dr,Dr=q.pop()),Dr=V.symbols_[Dr]||Dr),Dr}o(bt,"lex");for(var Mt,xt,ut,Et,ft,yt,nt={},dn,Tt,On,tn;;){if(ut=xe[xe.length-1],this.defaultActions[ut]?Et=this.defaultActions[ut]:((Mt===null||typeof Mt>"u")&&(Mt=bt()),Et=Pe[ut]&&Pe[ut][Mt]),typeof Et>"u"||!Et.length||!Et[0]){var _r="";tn=[];for(dn in Pe[ut])this.terminals_[dn]&&dn>qe&&tn.push("'"+this.terminals_[dn]+"'");st.showPosition?_r="Parse error on line "+(we+1)+`: +Expecting `+Pn.join(", ")+", got '"+(this.terminals_[Et]||Et)+"'":At="Parse error on line "+(qe+1)+": Unexpected "+(Et==Ue?"end of input":"'"+(this.terminals_[Et]||Et)+"'"),this.parseError(At,{text:We.match,token:this.terminals_[Et]||Et,line:We.yylineno,loc:bt,expected:Pn})}if(nt[0]instanceof Array&&nt.length>1)throw new Error("Parse Error: multiple actions possible at state: "+yt+", token: "+Et);switch(nt[0]){case 1:ve.push(Et),_e.push(We.yytext),be.push(We.yylloc),ve.push(nt[1]),Et=null,ft?(Et=ft,ft=null):(at=We.yyleng,De=We.yytext,qe=We.yylineno,bt=We.yylloc,Lt>0&&Lt--);break;case 2:if(_r=this.productions_[nt[1]][1],On.$=_e[_e.length-_r],On._$={first_line:be[be.length-(_r||1)].first_line,last_line:be[be.length-1].last_line,first_column:be[be.length-(_r||1)].first_column,last_column:be[be.length-1].last_column},Mt&&(On._$.range=[be[be.length-(_r||1)].range[0],be[be.length-1].range[1]]),Tt=this.performAction.apply(On,[De,at,qe,ot.yy,nt[1],_e,be].concat(ct)),typeof Tt<"u")return Tt;_r&&(ve=ve.slice(0,-1*_r*2),_e=_e.slice(0,-1*_r),be=be.slice(0,-1*_r)),ve.push(this.productions_[nt[1]][0]),_e.push(On.$),be.push(On._$),Dr=Ve[ve[ve.length-2]][ve[ve.length-1]],ve.push(Dr);break;case 3:return!0}}return!0},"parse")},oe=function(){var we={EOF:1,parseError:o(function(pe,ve){if(this.yy.parser)this.yy.parser.parseError(pe,ve);else throw new Error(pe)},"parseError"),setInput:o(function(W,pe){return this.yy=pe||this.yy||{},this._input=W,this._more=this._backtrack=this.done=!1,this.yylineno=this.yyleng=0,this.yytext=this.matched=this.match="",this.conditionStack=["INITIAL"],this.yylloc={first_line:1,first_column:0,last_line:1,last_column:0},this.options.ranges&&(this.yylloc.range=[0,0]),this.offset=0,this},"setInput"),input:o(function(){var W=this._input[0];this.yytext+=W,this.yyleng++,this.offset++,this.match+=W,this.matched+=W;var pe=W.match(/(?:\r\n?|\n).*/g);return pe?(this.yylineno++,this.yylloc.last_line++):this.yylloc.last_column++,this.options.ranges&&this.yylloc.range[1]++,this._input=this._input.slice(1),W},"input"),unput:o(function(W){var pe=W.length,ve=W.split(/(?:\r\n?|\n)/g);this._input=W+this._input,this.yytext=this.yytext.substr(0,this.yytext.length-pe),this.offset-=pe;var Pe=this.match.split(/(?:\r\n?|\n)/g);this.match=this.match.substr(0,this.match.length-1),this.matched=this.matched.substr(0,this.matched.length-1),ve.length-1&&(this.yylineno-=ve.length-1);var _e=this.yylloc.range;return this.yylloc={first_line:this.yylloc.first_line,last_line:this.yylineno+1,first_column:this.yylloc.first_column,last_column:ve?(ve.length===Pe.length?this.yylloc.first_column:0)+Pe[Pe.length-ve.length].length-ve[0].length:this.yylloc.first_column-pe},this.options.ranges&&(this.yylloc.range=[_e[0],_e[0]+this.yyleng-pe]),this.yyleng=this.yytext.length,this},"unput"),more:o(function(){return this._more=!0,this},"more"),reject:o(function(){if(this.options.backtrack_lexer)this._backtrack=!0;else return this.parseError("Lexical error on line "+(this.yylineno+1)+`. You can only invoke reject() in the lexer when the lexer is of the backtracking persuasion (options.backtrack_lexer = true). +`+this.showPosition(),{text:"",token:null,line:this.yylineno});return this},"reject"),less:o(function(W){this.unput(this.match.slice(W))},"less"),pastInput:o(function(){var W=this.matched.substr(0,this.matched.length-this.match.length);return(W.length>20?"...":"")+W.substr(-20).replace(/\n/g,"")},"pastInput"),upcomingInput:o(function(){var W=this.match;return W.length<20&&(W+=this._input.substr(0,20-W.length)),(W.substr(0,20)+(W.length>20?"...":"")).replace(/\n/g,"")},"upcomingInput"),showPosition:o(function(){var W=this.pastInput(),pe=new Array(W.length+1).join("-");return W+this.upcomingInput()+` +`+pe+"^"},"showPosition"),test_match:o(function(W,pe){var ve,Pe,_e;if(this.options.backtrack_lexer&&(_e={yylineno:this.yylineno,yylloc:{first_line:this.yylloc.first_line,last_line:this.last_line,first_column:this.yylloc.first_column,last_column:this.yylloc.last_column},yytext:this.yytext,match:this.match,matches:this.matches,matched:this.matched,yyleng:this.yyleng,offset:this.offset,_more:this._more,_input:this._input,yy:this.yy,conditionStack:this.conditionStack.slice(0),done:this.done},this.options.ranges&&(_e.yylloc.range=this.yylloc.range.slice(0))),Pe=W[0].match(/(?:\r\n?|\n).*/g),Pe&&(this.yylineno+=Pe.length),this.yylloc={first_line:this.yylloc.last_line,last_line:this.yylineno+1,first_column:this.yylloc.last_column,last_column:Pe?Pe[Pe.length-1].length-Pe[Pe.length-1].match(/\r?\n?/)[0].length:this.yylloc.last_column+W[0].length},this.yytext+=W[0],this.match+=W[0],this.matches=W,this.yyleng=this.yytext.length,this.options.ranges&&(this.yylloc.range=[this.offset,this.offset+=this.yyleng]),this._more=!1,this._backtrack=!1,this._input=this._input.slice(W[0].length),this.matched+=W[0],ve=this.performAction.call(this,this.yy,this,pe,this.conditionStack[this.conditionStack.length-1]),this.done&&this._input&&(this.done=!1),ve)return ve;if(this._backtrack){for(var be in _e)this[be]=_e[be];return!1}return!1},"test_match"),next:o(function(){if(this.done)return this.EOF;this._input||(this.done=!0);var W,pe,ve,Pe;this._more||(this.yytext="",this.match="");for(var _e=this._currentRules(),be=0;be<_e.length;be++)if(ve=this._input.match(this.rules[_e[be]]),ve&&(!pe||ve[0].length>pe[0].length)){if(pe=ve,Pe=be,this.options.backtrack_lexer){if(W=this.test_match(ve,_e[be]),W!==!1)return W;if(this._backtrack){pe=!1;continue}else return!1}else if(!this.options.flex)break}return pe?(W=this.test_match(pe,_e[Pe]),W!==!1?W:!1):this._input===""?this.EOF:this.parseError("Lexical error on line "+(this.yylineno+1)+`. Unrecognized text. +`+this.showPosition(),{text:"",token:null,line:this.yylineno})},"next"),lex:o(function(){var pe=this.next();return pe||this.lex()},"lex"),begin:o(function(pe){this.conditionStack.push(pe)},"begin"),popState:o(function(){var pe=this.conditionStack.length-1;return pe>0?this.conditionStack.pop():this.conditionStack[0]},"popState"),_currentRules:o(function(){return this.conditionStack.length&&this.conditionStack[this.conditionStack.length-1]?this.conditions[this.conditionStack[this.conditionStack.length-1]].rules:this.conditions.INITIAL.rules},"_currentRules"),topState:o(function(pe){return pe=this.conditionStack.length-1-Math.abs(pe||0),pe>=0?this.conditionStack[pe]:"INITIAL"},"topState"),pushState:o(function(pe){this.begin(pe)},"pushState"),stateStackSize:o(function(){return this.conditionStack.length},"stateStackSize"),options:{"case-insensitive":!0},performAction:o(function(pe,ve,Pe,_e){var be=_e;switch(Pe){case 0:break;case 1:break;case 2:return 55;case 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Map,X.info("clear called")}setData(e){this.data={...this.data,...e}}addPoints(e){this.data.points=[...e,...this.data.points]}addClass(e,r){this.classes.set(e,r)}setConfig(e){X.trace("setConfig called with: ",e),this.config={...this.config,...e}}setThemeConfig(e){X.trace("setThemeConfig called with: ",e),this.themeConfig={...this.themeConfig,...e}}calculateSpace(e,r,n,i){let a=this.config.xAxisLabelPadding*2+this.config.xAxisLabelFontSize,s={top:e==="top"&&r?a:0,bottom:e==="bottom"&&r?a:0},l=this.config.yAxisLabelPadding*2+this.config.yAxisLabelFontSize,u={left:this.config.yAxisPosition==="left"&&n?l:0,right:this.config.yAxisPosition==="right"&&n?l:0},h=this.config.titleFontSize+this.config.titlePadding*2,f={top:i?h:0},d=this.config.quadrantPadding+u.left,p=this.config.quadrantPadding+s.top+f.top,m=this.config.chartWidth-this.config.quadrantPadding*2-u.left-u.right,g=this.config.chartHeight-this.config.quadrantPadding*2-s.top-s.bottom-f.top,y=m/2,v=g/2;return{xAxisSpace:s,yAxisSpace:u,titleSpace:f,quadrantSpace:{quadrantLeft:d,quadrantTop:p,quadrantWidth:m,quadrantHalfWidth:y,quadrantHeight:g,quadrantHalfHeight:v}}}getAxisLabels(e,r,n,i){let{quadrantSpace:a,titleSpace:s}=i,{quadrantHalfHeight:l,quadrantHeight:u,quadrantLeft:h,quadrantHalfWidth:f,quadrantTop:d,quadrantWidth:p}=a,m=!!this.data.xAxisRightText,g=!!this.data.yAxisTopText,y=[];return this.data.xAxisLeftText&&r&&y.push({text:this.data.xAxisLeftText,fill:this.themeConfig.quadrantXAxisTextFill,x:h+(m?f/2:0),y:e==="top"?this.config.xAxisLabelPadding+s.top:this.config.xAxisLabelPadding+d+u+this.config.quadrantPadding,fontSize:this.config.xAxisLabelFontSize,verticalPos:m?"center":"left",horizontalPos:"top",rotation:0}),this.data.xAxisRightText&&r&&y.push({text:this.data.xAxisRightText,fill:this.themeConfig.quadrantXAxisTextFill,x:h+f+(m?f/2:0),y:e==="top"?this.config.xAxisLabelPadding+s.top:this.config.xAxisLabelPadding+d+u+this.config.quadrantPadding,fontSize:this.config.xAxisLabelFontSize,verticalPos:m?"center":"left",horizontalPos:"top",rotation:0}),this.data.yAxisBottomText&&n&&y.push({text:this.data.yAxisBottomText,fill:this.themeConfig.quadrantYAxisTextFill,x:this.config.yAxisPosition==="left"?this.config.yAxisLabelPadding:this.config.yAxisLabelPadding+h+p+this.config.quadrantPadding,y:d+u-(g?l/2:0),fontSize:this.config.yAxisLabelFontSize,verticalPos:g?"center":"left",horizontalPos:"top",rotation:-90}),this.data.yAxisTopText&&n&&y.push({text:this.data.yAxisTopText,fill:this.themeConfig.quadrantYAxisTextFill,x:this.config.yAxisPosition==="left"?this.config.yAxisLabelPadding:this.config.yAxisLabelPadding+h+p+this.config.quadrantPadding,y:d+l-(g?l/2:0),fontSize:this.config.yAxisLabelFontSize,verticalPos:g?"center":"left",horizontalPos:"top",rotation:-90}),y}getQuadrants(e){let{quadrantSpace:r}=e,{quadrantHalfHeight:n,quadrantLeft:i,quadrantHalfWidth:a,quadrantTop:s}=r,l=[{text:{text:this.data.quadrant1Text,fill:this.themeConfig.quadrant1TextFill,x:0,y:0,fontSize:this.config.quadrantLabelFontSize,verticalPos:"center",horizontalPos:"middle",rotation:0},x:i+a,y:s,width:a,height:n,fill:this.themeConfig.quadrant1Fill},{text:{text:this.data.quadrant2Text,fill:this.themeConfig.quadrant2TextFill,x:0,y:0,fontSize:this.config.quadrantLabelFontSize,verticalPos:"center",horizontalPos:"middle",rotation:0},x:i,y:s,width:a,height:n,fill:this.themeConfig.quadrant2Fill},{text:{text:this.data.quadrant3Text,fill:this.themeConfig.quadrant3TextFill,x:0,y:0,fontSize:this.config.quadrantLabelFontSize,verticalPos:"center",horizontalPos:"middle",rotation:0},x:i,y:s+n,width:a,height:n,fill:this.themeConfig.quadrant3Fill},{text:{text:this.data.quadrant4Text,fill:this.themeConfig.quadrant4TextFill,x:0,y:0,fontSize:this.config.quadrantLabelFontSize,verticalPos:"center",horizontalPos:"middle",rotation:0},x:i+a,y:s+n,width:a,height:n,fill:this.themeConfig.quadrant4Fill}];for(let u of l)u.text.x=u.x+u.width/2,this.data.points.length===0?(u.text.y=u.y+u.height/2,u.text.horizontalPos="middle"):(u.text.y=u.y+this.config.quadrantTextTopPadding,u.text.horizontalPos="top");return l}getQuadrantPoints(e){let{quadrantSpace:r}=e,{quadrantHeight:n,quadrantLeft:i,quadrantTop:a,quadrantWidth:s}=r,l=vl().domain([0,1]).range([i,s+i]),u=vl().domain([0,1]).range([n+a,a]);return this.data.points.map(f=>{let d=this.classes.get(f.className);return d&&(f={...d,...f}),{x:l(f.x),y:u(f.y),fill:f.color??this.themeConfig.quadrantPointFill,radius:f.radius??this.config.pointRadius,text:{text:f.text,fill:this.themeConfig.quadrantPointTextFill,x:l(f.x),y:u(f.y)+this.config.pointTextPadding,verticalPos:"center",horizontalPos:"top",fontSize:this.config.pointLabelFontSize,rotation:0},strokeColor:f.strokeColor??this.themeConfig.quadrantPointFill,strokeWidth:f.strokeWidth??"0px"}})}getBorders(e){let 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cGe,ba,kGe,bhe,whe=N(()=>{"use strict";zt();dr();mi();ghe();xhe();cGe=me();o(Zu,"textSanitizer");ba=new kS;o(uGe,"setQuadrant1Text");o(hGe,"setQuadrant2Text");o(fGe,"setQuadrant3Text");o(dGe,"setQuadrant4Text");o(pGe,"setXAxisLeftText");o(mGe,"setXAxisRightText");o(gGe,"setYAxisTopText");o(yGe,"setYAxisBottomText");o(vO,"parseStyles");o(vGe,"addPoint");o(xGe,"addClass");o(bGe,"setWidth");o(wGe,"setHeight");o(TGe,"getQuadrantData");kGe=o(function(){ba.clear(),Ar()},"clear"),bhe={setWidth:bGe,setHeight:wGe,setQuadrant1Text:uGe,setQuadrant2Text:hGe,setQuadrant3Text:fGe,setQuadrant4Text:dGe,setXAxisLeftText:pGe,setXAxisRightText:mGe,setYAxisTopText:gGe,setYAxisBottomText:yGe,parseStyles:vO,addPoint:vGe,addClass:xGe,getQuadrantData:TGe,clear:kGe,setAccTitle:Lr,getAccTitle:Rr,setDiagramTitle:$r,getDiagramTitle:Ir,getAccDescription:Mr,setAccDescription:Nr}});var EGe,The,khe=N(()=>{"use strict";pr();zt();vt();Si();EGe=o((t,e,r,n)=>{function i(S){return 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e=this.chartConfig.width,r=this.chartConfig.height,n=0,i=0,a=Math.floor(e*this.chartConfig.plotReservedSpacePercent/100),s=Math.floor(r*this.chartConfig.plotReservedSpacePercent/100),l=this.componentStore.plot.calculateSpace({width:a,height:s});e-=l.width,r-=l.height,l=this.componentStore.title.calculateSpace({width:this.chartConfig.width,height:r}),i=l.height,r-=l.height,this.componentStore.xAxis.setAxisPosition("bottom"),l=this.componentStore.xAxis.calculateSpace({width:e,height:r}),r-=l.height,this.componentStore.yAxis.setAxisPosition("left"),l=this.componentStore.yAxis.calculateSpace({width:e,height:r}),n=l.width,e-=l.width,e>0&&(a+=e,e=0),r>0&&(s+=r,r=0),this.componentStore.plot.calculateSpace({width:a,height:s}),this.componentStore.plot.setBoundingBoxXY({x:n,y:i}),this.componentStore.xAxis.setRange([n,n+a]),this.componentStore.xAxis.setBoundingBoxXY({x:n,y:i+s}),this.componentStore.yAxis.setRange([i,i+s]),this.componentStore.yAxis.setBoundingBoxXY({x:0,y:i}),this.chartData.plots.some(u=>bO(u))&&this.componentStore.xAxis.recalculateOuterPaddingToDrawBar()}calculateHorizontalSpace(){let 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68:this.$=ve[_e-1]+ve[_e];break}},"anonymous"),table:[{3:1,4:2,6:e,9:r,11:n,13:i},{1:[3]},{3:8,4:2,5:[1,7],6:e,9:r,11:n,13:i},{5:[1,9]},{10:[1,10]},{12:[1,11]},t(a,[2,6]),{3:12,4:2,6:e,9:r,11:n,13:i},{1:[2,2]},{4:17,5:s,7:13,8:l,9:r,11:n,13:i,14:14,15:15,16:16,17:18,18:19,19:20,20:21,21:u,22:h,23:f,24:d,25:23,33:25,41:p,42:m,43:g,44:y,45:v,46:x,54:b,72:w,74:C,77:T,89:E,90:A},t(a,[2,4]),t(a,[2,5]),{1:[2,1]},{8:[1,41]},{4:17,5:s,7:42,8:l,9:r,11:n,13:i,14:14,15:15,16:16,17:18,18:19,19:20,20:21,21:u,22:h,23:f,24:d,25:23,33:25,41:p,42:m,43:g,44:y,45:v,46:x,54:b,72:w,74:C,77:T,89:E,90:A},{4:17,5:s,7:43,8:l,9:r,11:n,13:i,14:14,15:15,16:16,17:18,18:19,19:20,20:21,21:u,22:h,23:f,24:d,25:23,33:25,41:p,42:m,43:g,44:y,45:v,46:x,54:b,72:w,74:C,77:T,89:E,90:A},{4:17,5:s,7:44,8:l,9:r,11:n,13:i,14:14,15:15,16:16,17:18,18:19,19:20,20:21,21:u,22:h,23:f,24:d,25:23,33:25,41:p,42:m,43:g,44:y,45:v,46:x,54:b,72:w,74:C,77:T,89:E,90:A},{4:17,5:s,7:45,8:l,9:r,11:n,13:i,14:14,15:15,16:16,17:18,18:19,19:20,20:21,21:u,22:h,23:f,24:d,25:23,33:25,41:p,42:m,43:g,44:y,45:v,46:x,54:b,72:w,74:C,77:T,89:E,90:A},{4:17,5:s,7:46,8:l,9:r,11:n,13:i,14:14,15:15,16:16,17:18,18:19,19:20,20:21,21:u,22:h,23:f,24:d,25:23,33:25,41:p,42:m,43:g,44:y,45:v,46:x,54:b,72:w,74:C,77:T,89:E,90:A},{4:17,5:s,7:47,8:l,9:r,11:n,13:i,14:14,15:15,16:16,17:18,18:19,19:20,20:21,21:u,22:h,23:f,24:d,25:23,33:25,41:p,42:m,43:g,44:y,45:v,46:x,54:b,72:w,74:C,77:T,89:E,90:A},{4:17,5:s,7:48,8:l,9:r,11:n,13:i,14:14,15:15,16:16,17:18,18:19,19:20,20:21,21:u,22:h,23:f,24:d,25:23,33:25,41:p,42:m,43:g,44:y,45:v,46:x,54:b,72:w,74:C,77:T,89:E,90:A},{4:17,5:s,7:49,8:l,9:r,11:n,13:i,14:14,15:15,16:16,17:18,18:19,19:20,20:21,21:u,22:h,23:f,24:d,25:23,33:25,41:p,42:m,43:g,44:y,45:v,46:x,54:b,72:w,74:C,77:T,89:E,90:A},{4:17,5:s,7:50,8:l,9:r,11:n,13:i,14:14,15:15,16:16,17:18,18:19,19:20,20:21,21:u,22:h,23:f,24:d,25:23,33:25,41:p,42:m,43:g,44:y,45:v,46:x,54:b,72:w,74:C,77:T,89:E,90:A},{26:51,89:[1,52],90:[1,53]},{55:54,89:[1,55],90:[1,56]},{29:[1,59],61:[1,57],63:[1,58]},t(S,[2,17]),t(S,[2,18]),t(S,[2,19]),t(S,[2,20]),{30:60,33:62,75:_,89:E,90:A},{30:63,33:62,75:_,89:E,90:A},{30:64,33:62,75:_,89:E,90:A},t(I,[2,29]),t(I,[2,30]),t(I,[2,31]),t(I,[2,32]),t(I,[2,33]),t(I,[2,34]),t(L,[2,81]),t(L,[2,82]),{1:[2,3]},{8:[2,8]},{8:[2,9]},{8:[2,10]},{8:[2,11]},{8:[2,12]},{8:[2,13]},{8:[2,14]},{8:[2,15]},{8:[2,16]},{27:[1,65],29:[1,66]},t(k,[2,79]),t(k,[2,80]),{27:[1,67],29:[1,68]},t(k,[2,85]),t(k,[2,86]),{62:69,65:D,66:R,67:O,68:M,69:P,70:B,71:F},{62:77,65:D,66:R,67:O,68:M,69:P,70:B,71:F},{30:78,33:62,75:_,89:E,90:A},{73:79,75:z,76:$,78:81,79:82,80:U,81:Q,82:te,83:Y,84:he,85:Z,86:ue,87:K,88:j},t(ne,[2,60]),t(ne,[2,62]),{73:93,75:z,76:$,78:81,79:82,80:U,81:Q,82:te,83:Y,84:he,85:Z,86:ue,87:K,88:j},{30:94,33:62,75:_,76:$,89:E,90:A},{5:[1,95]},{30:96,33:62,75:_,89:E,90:A},{5:[1,97]},{30:98,33:62,75:_,89:E,90:A},{63:[1,99]},t(ee,[2,50]),t(ee,[2,51]),t(ee,[2,52]),t(ee,[2,53]),t(ee,[2,54]),t(ee,[2,55]),t(ee,[2,56]),{64:[1,100]},t(S,[2,59],{76:$}),t(S,[2,64],{76:ce}),{33:103,75:[1,102],89:E,90:A},t(le,[2,65],{79:104,75:z,80:U,81:Q,82:te,83:Y,84:he,85:Z,86:ue,87:K,88:j}),t(J,[2,67]),t(J,[2,69]),t(J,[2,70]),t(J,[2,71]),t(J,[2,72]),t(J,[2,73]),t(J,[2,74]),t(J,[2,75]),t(J,[2,76]),t(J,[2,77]),t(J,[2,78]),t(S,[2,57],{76:ce}),t(S,[2,58],{76:$}),{5:Se,28:105,31:se,34:ae,36:Oe,38:ye,40:Be},{27:[1,112],76:$},{5:He,40:ze,56:113,57:Le,59:Ie},{27:[1,118],76:$},{33:119,89:E,90:A},{33:120,89:E,90:A},{75:z,78:121,79:82,80:U,81:Q,82:te,83:Y,84:he,85:Z,86:ue,87:K,88:j},t(ne,[2,61]),t(ne,[2,63]),t(J,[2,68]),t(S,[2,21]),{32:[1,122]},{32:[1,123]},{32:[1,124]},{32:[1,125]},{5:Se,28:126,31:se,34:ae,36:Oe,38:ye,40:Be},t(S,[2,28]),{5:[1,127]},t(S,[2,42]),{32:[1,128]},{32:[1,129]},{5:He,40:ze,56:130,57:Le,59:Ie},t(S,[2,47]),{5:[1,131]},t(S,[2,48]),t(S,[2,49]),t(le,[2,66],{79:104,75:z,80:U,81:Q,82:te,83:Y,84:he,85:Z,86:ue,87:K,88:j}),{33:132,89:E,90:A},{35:133,89:[1,134],90:[1,135]},{37:136,47:[1,137],48:[1,138],49:[1,139]},{39:140,50:[1,141],51:[1,142],52:[1,143],53:[1,144]},t(S,[2,27]),{5:Se,28:145,31:se,34:ae,36:Oe,38:ye,40:Be},{58:146,89:[1,147],90:[1,148]},{60:149,89:[1,150],90:[1,151]},t(S,[2,46]),{5:He,40:ze,56:152,57:Le,59:Ie},{5:[1,153]},{5:[1,154]},{5:[2,83]},{5:[2,84]},{5:[1,155]},{5:[2,35]},{5:[2,36]},{5:[2,37]},{5:[1,156]},{5:[2,38]},{5:[2,39]},{5:[2,40]},{5:[2,41]},t(S,[2,22]),{5:[1,157]},{5:[2,87]},{5:[2,88]},{5:[1,158]},{5:[2,89]},{5:[2,90]},t(S,[2,43]),{5:Se,28:159,31:se,34:ae,36:Oe,38:ye,40:Be},{5:Se,28:160,31:se,34:ae,36:Oe,38:ye,40:Be},{5:Se,28:161,31:se,34:ae,36:Oe,38:ye,40:Be},{5:Se,28:162,31:se,34:ae,36:Oe,38:ye,40:Be},{5:He,40:ze,56:163,57:Le,59:Ie},{5:He,40:ze,56:164,57:Le,59:Ie},t(S,[2,23]),t(S,[2,24]),t(S,[2,25]),t(S,[2,26]),t(S,[2,44]),t(S,[2,45])],defaultActions:{8:[2,2],12:[2,1],41:[2,3],42:[2,8],43:[2,9],44:[2,10],45:[2,11],46:[2,12],47:[2,13],48:[2,14],49:[2,15],50:[2,16],134:[2,83],135:[2,84],137:[2,35],138:[2,36],139:[2,37],141:[2,38],142:[2,39],143:[2,40],144:[2,41],147:[2,87],148:[2,88],150:[2,89],151:[2,90]},parseError:o(function(oe,V){if(V.recoverable)this.trace(oe);else{var we=new Error(oe);throw we.hash=V,we}},"parseError"),parse:o(function(oe){var V=this,we=[0],W=[],pe=[null],ve=[],Pe=this.table,_e="",be=0,Ve=0,De=0,qe=2,at=1,Lt=ve.slice.call(arguments,1),st=Object.create(this.lexer),Ue={yy:{}};for(var ct in this.yy)Object.prototype.hasOwnProperty.call(this.yy,ct)&&(Ue.yy[ct]=this.yy[ct]);st.setInput(oe,Ue.yy),Ue.yy.lexer=st,Ue.yy.parser=this,typeof st.yylloc>"u"&&(st.yylloc={});var We=st.yylloc;ve.push(We);var ot=st.options&&st.options.ranges;typeof Ue.yy.parseError=="function"?this.parseError=Ue.yy.parseError:this.parseError=Object.getPrototypeOf(this).parseError;function Yt(Dr){we.length=we.length-2*Dr,pe.length=pe.length-Dr,ve.length=ve.length-Dr}o(Yt,"popStack");function bt(){var Dr;return Dr=W.pop()||st.lex()||at,typeof Dr!="number"&&(Dr instanceof Array&&(W=Dr,Dr=W.pop()),Dr=V.symbols_[Dr]||Dr),Dr}o(bt,"lex");for(var Mt,xt,ut,Et,ft,yt,nt={},dn,Tt,On,tn;;){if(ut=we[we.length-1],this.defaultActions[ut]?Et=this.defaultActions[ut]:((Mt===null||typeof Mt>"u")&&(Mt=bt()),Et=Pe[ut]&&Pe[ut][Mt]),typeof Et>"u"||!Et.length||!Et[0]){var _r="";tn=[];for(dn in Pe[ut])this.terminals_[dn]&&dn>qe&&tn.push("'"+this.terminals_[dn]+"'");st.showPosition?_r="Parse error on line "+(be+1)+`: `+st.showPosition()+` -Expecting `+tn.join(", ")+", got '"+(this.terminals_[Mt]||Mt)+"'":_r="Parse error on line "+(we+1)+": Unexpected "+(Mt==at?"end of input":"'"+(this.terminals_[Mt]||Mt)+"'"),this.parseError(_r,{text:st.match,token:this.terminals_[Mt]||Mt,line:st.yylineno,loc:We,expected:tn})}if(Et[0]instanceof Array&&Et.length>1)throw new Error("Parse Error: multiple actions possible at state: "+ut+", token: "+Mt);switch(Et[0]){case 1:xe.push(Mt),pe.push(st.yytext),ve.push(st.yylloc),xe.push(Et[1]),Mt=null,xt?(Mt=xt,xt=null):(Ve=st.yyleng,_e=st.yytext,we=st.yylineno,We=st.yylloc,De>0&&De--);break;case 2:if(Tt=this.productions_[Et[1]][1],nt.$=pe[pe.length-Tt],nt._$={first_line:ve[ve.length-(Tt||1)].first_line,last_line:ve[ve.length-1].last_line,first_column:ve[ve.length-(Tt||1)].first_column,last_column:ve[ve.length-1].last_column},ot&&(nt._$.range=[ve[ve.length-(Tt||1)].range[0],ve[ve.length-1].range[1]]),yt=this.performAction.apply(nt,[_e,Ve,we,Ue.yy,Et[1],pe,ve].concat(Rt)),typeof yt<"u")return yt;Tt&&(xe=xe.slice(0,-1*Tt*2),pe=pe.slice(0,-1*Tt),ve=ve.slice(0,-1*Tt)),xe.push(this.productions_[Et[1]][0]),pe.push(nt.$),ve.push(nt._$),On=Pe[xe[xe.length-2]][xe[xe.length-1]],xe.push(On);break;case 3:return!0}}return!0},"parse")},W=function(){var re={EOF:1,parseError:o(function(V,xe){if(this.yy.parser)this.yy.parser.parseError(V,xe);else throw new Error(V)},"parseError"),setInput:o(function(oe,V){return this.yy=V||this.yy||{},this._input=oe,this._more=this._backtrack=this.done=!1,this.yylineno=this.yyleng=0,this.yytext=this.matched=this.match="",this.conditionStack=["INITIAL"],this.yylloc={first_line:1,first_column:0,last_line:1,last_column:0},this.options.ranges&&(this.yylloc.range=[0,0]),this.offset=0,this},"setInput"),input:o(function(){var oe=this._input[0];this.yytext+=oe,this.yyleng++,this.offset++,this.match+=oe,this.matched+=oe;var V=oe.match(/(?:\r\n?|\n).*/g);return V?(this.yylineno++,this.yylloc.last_line++):this.yylloc.last_column++,this.options.ranges&&this.yylloc.range[1]++,this._input=this._input.slice(1),oe},"input"),unput:o(function(oe){var V=oe.length,xe=oe.split(/(?:\r\n?|\n)/g);this._input=oe+this._input,this.yytext=this.yytext.substr(0,this.yytext.length-V),this.offset-=V;var q=this.match.split(/(?:\r\n?|\n)/g);this.match=this.match.substr(0,this.match.length-1),this.matched=this.matched.substr(0,this.matched.length-1),xe.length-1&&(this.yylineno-=xe.length-1);var pe=this.yylloc.range;return this.yylloc={first_line:this.yylloc.first_line,last_line:this.yylineno+1,first_column:this.yylloc.first_column,last_column:xe?(xe.length===q.length?this.yylloc.first_column:0)+q[q.length-xe.length].length-xe[0].length:this.yylloc.first_column-V},this.options.ranges&&(this.yylloc.range=[pe[0],pe[0]+this.yyleng-V]),this.yyleng=this.yytext.length,this},"unput"),more:o(function(){return this._more=!0,this},"more"),reject:o(function(){if(this.options.backtrack_lexer)this._backtrack=!0;else return this.parseError("Lexical error on line "+(this.yylineno+1)+`. You can only invoke reject() in the lexer when the lexer is of the backtracking persuasion (options.backtrack_lexer = true). +Expecting `+tn.join(", ")+", got '"+(this.terminals_[Mt]||Mt)+"'":_r="Parse error on line "+(be+1)+": Unexpected "+(Mt==at?"end of input":"'"+(this.terminals_[Mt]||Mt)+"'"),this.parseError(_r,{text:st.match,token:this.terminals_[Mt]||Mt,line:st.yylineno,loc:We,expected:tn})}if(Et[0]instanceof Array&&Et.length>1)throw new Error("Parse Error: multiple actions possible at state: "+ut+", token: "+Mt);switch(Et[0]){case 1:we.push(Mt),pe.push(st.yytext),ve.push(st.yylloc),we.push(Et[1]),Mt=null,xt?(Mt=xt,xt=null):(Ve=st.yyleng,_e=st.yytext,be=st.yylineno,We=st.yylloc,De>0&&De--);break;case 2:if(Tt=this.productions_[Et[1]][1],nt.$=pe[pe.length-Tt],nt._$={first_line:ve[ve.length-(Tt||1)].first_line,last_line:ve[ve.length-1].last_line,first_column:ve[ve.length-(Tt||1)].first_column,last_column:ve[ve.length-1].last_column},ot&&(nt._$.range=[ve[ve.length-(Tt||1)].range[0],ve[ve.length-1].range[1]]),yt=this.performAction.apply(nt,[_e,Ve,be,Ue.yy,Et[1],pe,ve].concat(Lt)),typeof yt<"u")return yt;Tt&&(we=we.slice(0,-1*Tt*2),pe=pe.slice(0,-1*Tt),ve=ve.slice(0,-1*Tt)),we.push(this.productions_[Et[1]][0]),pe.push(nt.$),ve.push(nt._$),On=Pe[we[we.length-2]][we[we.length-1]],we.push(On);break;case 3:return!0}}return!0},"parse")},q=function(){var ie={EOF:1,parseError:o(function(V,we){if(this.yy.parser)this.yy.parser.parseError(V,we);else throw new Error(V)},"parseError"),setInput:o(function(oe,V){return this.yy=V||this.yy||{},this._input=oe,this._more=this._backtrack=this.done=!1,this.yylineno=this.yyleng=0,this.yytext=this.matched=this.match="",this.conditionStack=["INITIAL"],this.yylloc={first_line:1,first_column:0,last_line:1,last_column:0},this.options.ranges&&(this.yylloc.range=[0,0]),this.offset=0,this},"setInput"),input:o(function(){var oe=this._input[0];this.yytext+=oe,this.yyleng++,this.offset++,this.match+=oe,this.matched+=oe;var V=oe.match(/(?:\r\n?|\n).*/g);return V?(this.yylineno++,this.yylloc.last_line++):this.yylloc.last_column++,this.options.ranges&&this.yylloc.range[1]++,this._input=this._input.slice(1),oe},"input"),unput:o(function(oe){var V=oe.length,we=oe.split(/(?:\r\n?|\n)/g);this._input=oe+this._input,this.yytext=this.yytext.substr(0,this.yytext.length-V),this.offset-=V;var W=this.match.split(/(?:\r\n?|\n)/g);this.match=this.match.substr(0,this.match.length-1),this.matched=this.matched.substr(0,this.matched.length-1),we.length-1&&(this.yylineno-=we.length-1);var pe=this.yylloc.range;return this.yylloc={first_line:this.yylloc.first_line,last_line:this.yylineno+1,first_column:this.yylloc.first_column,last_column:we?(we.length===W.length?this.yylloc.first_column:0)+W[W.length-we.length].length-we[0].length:this.yylloc.first_column-V},this.options.ranges&&(this.yylloc.range=[pe[0],pe[0]+this.yyleng-V]),this.yyleng=this.yytext.length,this},"unput"),more:o(function(){return this._more=!0,this},"more"),reject:o(function(){if(this.options.backtrack_lexer)this._backtrack=!0;else return this.parseError("Lexical error on line "+(this.yylineno+1)+`. You can only invoke reject() in the lexer when the lexer is of the backtracking persuasion (options.backtrack_lexer = true). `+this.showPosition(),{text:"",token:null,line:this.yylineno});return this},"reject"),less:o(function(oe){this.unput(this.match.slice(oe))},"less"),pastInput:o(function(){var oe=this.matched.substr(0,this.matched.length-this.match.length);return(oe.length>20?"...":"")+oe.substr(-20).replace(/\n/g,"")},"pastInput"),upcomingInput:o(function(){var oe=this.match;return oe.length<20&&(oe+=this._input.substr(0,20-oe.length)),(oe.substr(0,20)+(oe.length>20?"...":"")).replace(/\n/g,"")},"upcomingInput"),showPosition:o(function(){var oe=this.pastInput(),V=new Array(oe.length+1).join("-");return oe+this.upcomingInput()+` -`+V+"^"},"showPosition"),test_match:o(function(oe,V){var xe,q,pe;if(this.options.backtrack_lexer&&(pe={yylineno:this.yylineno,yylloc:{first_line:this.yylloc.first_line,last_line:this.last_line,first_column:this.yylloc.first_column,last_column:this.yylloc.last_column},yytext:this.yytext,match:this.match,matches:this.matches,matched:this.matched,yyleng:this.yyleng,offset:this.offset,_more:this._more,_input:this._input,yy:this.yy,conditionStack:this.conditionStack.slice(0),done:this.done},this.options.ranges&&(pe.yylloc.range=this.yylloc.range.slice(0))),q=oe[0].match(/(?:\r\n?|\n).*/g),q&&(this.yylineno+=q.length),this.yylloc={first_line:this.yylloc.last_line,last_line:this.yylineno+1,first_column:this.yylloc.last_column,last_column:q?q[q.length-1].length-q[q.length-1].match(/\r?\n?/)[0].length:this.yylloc.last_column+oe[0].length},this.yytext+=oe[0],this.match+=oe[0],this.matches=oe,this.yyleng=this.yytext.length,this.options.ranges&&(this.yylloc.range=[this.offset,this.offset+=this.yyleng]),this._more=!1,this._backtrack=!1,this._input=this._input.slice(oe[0].length),this.matched+=oe[0],xe=this.performAction.call(this,this.yy,this,V,this.conditionStack[this.conditionStack.length-1]),this.done&&this._input&&(this.done=!1),xe)return xe;if(this._backtrack){for(var ve in pe)this[ve]=pe[ve];return!1}return!1},"test_match"),next:o(function(){if(this.done)return this.EOF;this._input||(this.done=!0);var oe,V,xe,q;this._more||(this.yytext="",this.match="");for(var pe=this._currentRules(),ve=0;veV[0].length)){if(V=xe,q=ve,this.options.backtrack_lexer){if(oe=this.test_match(xe,pe[ve]),oe!==!1)return oe;if(this._backtrack){V=!1;continue}else return!1}else if(!this.options.flex)break}return V?(oe=this.test_match(V,pe[q]),oe!==!1?oe:!1):this._input===""?this.EOF:this.parseError("Lexical error on line "+(this.yylineno+1)+`. Unrecognized text. -`+this.showPosition(),{text:"",token:null,line:this.yylineno})},"next"),lex:o(function(){var V=this.next();return V||this.lex()},"lex"),begin:o(function(V){this.conditionStack.push(V)},"begin"),popState:o(function(){var V=this.conditionStack.length-1;return V>0?this.conditionStack.pop():this.conditionStack[0]},"popState"),_currentRules:o(function(){return this.conditionStack.length&&this.conditionStack[this.conditionStack.length-1]?this.conditions[this.conditionStack[this.conditionStack.length-1]].rules:this.conditions.INITIAL.rules},"_currentRules"),topState:o(function(V){return V=this.conditionStack.length-1-Math.abs(V||0),V>=0?this.conditionStack[V]:"INITIAL"},"topState"),pushState:o(function(V){this.begin(V)},"pushState"),stateStackSize:o(function(){return this.conditionStack.length},"stateStackSize"),options:{"case-insensitive":!0},performAction:o(function(V,xe,q,pe){var ve=pe;switch(q){case 0:return"title";case 1:return this.begin("acc_title"),9;break;case 2:return this.popState(),"acc_title_value";break;case 3:return this.begin("acc_descr"),11;break;case 4:return this.popState(),"acc_descr_value";break;case 5:this.begin("acc_descr_multiline");break;case 6:this.popState();break;case 7:return"acc_descr_multiline_value";case 8:return 21;case 9:return 22;case 10:return 23;case 11:return 24;case 12:return 5;case 13:break;case 14:break;case 15:break;case 16:return 8;case 17:return 6;case 18:return 27;case 19:return 40;case 20:return 29;case 21:return 32;case 22:return 31;case 23:return 34;case 24:return 36;case 25:return 38;case 26:return 41;case 27:return 42;case 28:return 43;case 29:return 44;case 30:return 45;case 31:return 46;case 32:return 47;case 33:return 48;case 34:return 49;case 35:return 50;case 36:return 51;case 37:return 52;case 38:return 53;case 39:return 54;case 40:return 65;case 41:return 66;case 42:return 67;case 43:return 68;case 44:return 69;case 45:return 70;case 46:return 71;case 47:return 57;case 48:return 59;case 49:return this.begin("style"),77;break;case 50:return 75;case 51:return 81;case 52:return 88;case 53:return"PERCENT";case 54:return 86;case 55:return 84;case 56:break;case 57:this.begin("string");break;case 58:this.popState();break;case 59:return this.begin("style"),72;break;case 60:return this.begin("style"),74;break;case 61:return 61;case 62:return 64;case 63:return 63;case 64:this.begin("string");break;case 65:this.popState();break;case 66:return"qString";case 67:return xe.yytext=xe.yytext.trim(),89;break;case 68:return 75;case 69:return 80;case 70:return 76}},"anonymous"),rules:[/^(?:title\s[^#\n;]+)/i,/^(?:accTitle\s*:\s*)/i,/^(?:(?!\n||)*[^\n]*)/i,/^(?:accDescr\s*:\s*)/i,/^(?:(?!\n||)*[^\n]*)/i,/^(?:accDescr\s*\{\s*)/i,/^(?:[\}])/i,/^(?:[^\}]*)/i,/^(?:.*direction\s+TB[^\n]*)/i,/^(?:.*direction\s+BT[^\n]*)/i,/^(?:.*direction\s+RL[^\n]*)/i,/^(?:.*direction\s+LR[^\n]*)/i,/^(?:(\r?\n)+)/i,/^(?:\s+)/i,/^(?:#[^\n]*)/i,/^(?:%[^\n]*)/i,/^(?:$)/i,/^(?:requirementDiagram\b)/i,/^(?:\{)/i,/^(?:\})/i,/^(?::{3})/i,/^(?::)/i,/^(?:id\b)/i,/^(?:text\b)/i,/^(?:risk\b)/i,/^(?:verifyMethod\b)/i,/^(?:requirement\b)/i,/^(?:functionalRequirement\b)/i,/^(?:interfaceRequirement\b)/i,/^(?:performanceRequirement\b)/i,/^(?:physicalRequirement\b)/i,/^(?:designConstraint\b)/i,/^(?:low\b)/i,/^(?:medium\b)/i,/^(?:high\b)/i,/^(?:analysis\b)/i,/^(?:demonstration\b)/i,/^(?:inspection\b)/i,/^(?:test\b)/i,/^(?:element\b)/i,/^(?:contains\b)/i,/^(?:copies\b)/i,/^(?:derives\b)/i,/^(?:satisfies\b)/i,/^(?:verifies\b)/i,/^(?:refines\b)/i,/^(?:traces\b)/i,/^(?:type\b)/i,/^(?:docref\b)/i,/^(?:style\b)/i,/^(?:\w+)/i,/^(?::)/i,/^(?:;)/i,/^(?:%)/i,/^(?:-)/i,/^(?:#)/i,/^(?: )/i,/^(?:["])/i,/^(?:\n)/i,/^(?:classDef\b)/i,/^(?:class\b)/i,/^(?:<-)/i,/^(?:->)/i,/^(?:-)/i,/^(?:["])/i,/^(?:["])/i,/^(?:[^"]*)/i,/^(?:[\w][^:,\r\n\{\<\>\-\=]*)/i,/^(?:\w+)/i,/^(?:[0-9]+)/i,/^(?:,)/i],conditions:{acc_descr_multiline:{rules:[6,7,68,69,70],inclusive:!1},acc_descr:{rules:[4,68,69,70],inclusive:!1},acc_title:{rules:[2,68,69,70],inclusive:!1},style:{rules:[50,51,52,53,54,55,56,57,58,68,69,70],inclusive:!1},unqString:{rules:[68,69,70],inclusive:!1},token:{rules:[68,69,70],inclusive:!1},string:{rules:[65,66,68,69,70],inclusive:!1},INITIAL:{rules:[0,1,3,5,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,49,59,60,61,62,63,64,67,68,69,70],inclusive:!0}}};return re}();be.lexer=W;function de(){this.yy={}}return o(de,"Parser"),de.prototype=be,be.Parser=de,new de}();EO.parser=EO;Zhe=EO});var A6,efe=N(()=>{"use strict";zt();vt();mi();A6=class{constructor(){this.relations=[];this.latestRequirement=this.getInitialRequirement();this.requirements=new Map;this.latestElement=this.getInitialElement();this.elements=new Map;this.classes=new Map;this.direction="TB";this.RequirementType={REQUIREMENT:"Requirement",FUNCTIONAL_REQUIREMENT:"Functional Requirement",INTERFACE_REQUIREMENT:"Interface Requirement",PERFORMANCE_REQUIREMENT:"Performance Requirement",PHYSICAL_REQUIREMENT:"Physical Requirement",DESIGN_CONSTRAINT:"Design Constraint"};this.RiskLevel={LOW_RISK:"Low",MED_RISK:"Medium",HIGH_RISK:"High"};this.VerifyType={VERIFY_ANALYSIS:"Analysis",VERIFY_DEMONSTRATION:"Demonstration",VERIFY_INSPECTION:"Inspection",VERIFY_TEST:"Test"};this.Relationships={CONTAINS:"contains",COPIES:"copies",DERIVES:"derives",SATISFIES:"satisfies",VERIFIES:"verifies",REFINES:"refines",TRACES:"traces"};this.setAccTitle=Lr;this.getAccTitle=Rr;this.setAccDescription=Nr;this.getAccDescription=Mr;this.setDiagramTitle=$r;this.getDiagramTitle=Ir;this.getConfig=o(()=>me().requirement,"getConfig");this.clear(),this.setDirection=this.setDirection.bind(this),this.addRequirement=this.addRequirement.bind(this),this.setNewReqId=this.setNewReqId.bind(this),this.setNewReqRisk=this.setNewReqRisk.bind(this),this.setNewReqText=this.setNewReqText.bind(this),this.setNewReqVerifyMethod=this.setNewReqVerifyMethod.bind(this),this.addElement=this.addElement.bind(this),this.setNewElementType=this.setNewElementType.bind(this),this.setNewElementDocRef=this.setNewElementDocRef.bind(this),this.addRelationship=this.addRelationship.bind(this),this.setCssStyle=this.setCssStyle.bind(this),this.setClass=this.setClass.bind(this),this.defineClass=this.defineClass.bind(this),this.setAccTitle=this.setAccTitle.bind(this),this.setAccDescription=this.setAccDescription.bind(this)}static{o(this,"RequirementDB")}getDirection(){return this.direction}setDirection(e){this.direction=e}resetLatestRequirement(){this.latestRequirement=this.getInitialRequirement()}resetLatestElement(){this.latestElement=this.getInitialElement()}getInitialRequirement(){return{requirementId:"",text:"",risk:"",verifyMethod:"",name:"",type:"",cssStyles:[],classes:["default"]}}getInitialElement(){return{name:"",type:"",docRef:"",cssStyles:[],classes:["default"]}}addRequirement(e,r){return this.requirements.has(e)||this.requirements.set(e,{name:e,type:r,requirementId:this.latestRequirement.requirementId,text:this.latestRequirement.text,risk:this.latestRequirement.risk,verifyMethod:this.latestRequirement.verifyMethod,cssStyles:[],classes:["default"]}),this.resetLatestRequirement(),this.requirements.get(e)}getRequirements(){return this.requirements}setNewReqId(e){this.latestRequirement!==void 0&&(this.latestRequirement.requirementId=e)}setNewReqText(e){this.latestRequirement!==void 0&&(this.latestRequirement.text=e)}setNewReqRisk(e){this.latestRequirement!==void 0&&(this.latestRequirement.risk=e)}setNewReqVerifyMethod(e){this.latestRequirement!==void 0&&(this.latestRequirement.verifyMethod=e)}addElement(e){return this.elements.has(e)||(this.elements.set(e,{name:e,type:this.latestElement.type,docRef:this.latestElement.docRef,cssStyles:[],classes:["default"]}),Y.info("Added new element: ",e)),this.resetLatestElement(),this.elements.get(e)}getElements(){return this.elements}setNewElementType(e){this.latestElement!==void 0&&(this.latestElement.type=e)}setNewElementDocRef(e){this.latestElement!==void 0&&(this.latestElement.docRef=e)}addRelationship(e,r,n){this.relations.push({type:e,src:r,dst:n})}getRelationships(){return this.relations}clear(){this.relations=[],this.resetLatestRequirement(),this.requirements=new Map,this.resetLatestElement(),this.elements=new Map,this.classes=new Map,Ar()}setCssStyle(e,r){for(let n of e){let i=this.requirements.get(n)??this.elements.get(n);if(!r||!i)return;for(let a of r)a.includes(",")?i.cssStyles.push(...a.split(",")):i.cssStyles.push(a)}}setClass(e,r){for(let n of e){let i=this.requirements.get(n)??this.elements.get(n);if(i)for(let a of r){i.classes.push(a);let s=this.classes.get(a)?.styles;s&&i.cssStyles.push(...s)}}}defineClass(e,r){for(let n of e){let i=this.classes.get(n);i===void 0&&(i={id:n,styles:[],textStyles:[]},this.classes.set(n,i)),r&&r.forEach(function(a){if(/color/.exec(a)){let s=a.replace("fill","bgFill");i.textStyles.push(s)}i.styles.push(a)}),this.requirements.forEach(a=>{a.classes.includes(n)&&a.cssStyles.push(...r.flatMap(s=>s.split(",")))}),this.elements.forEach(a=>{a.classes.includes(n)&&a.cssStyles.push(...r.flatMap(s=>s.split(",")))})}}getClasses(){return this.classes}getData(){let e=me(),r=[],n=[];for(let i of this.requirements.values()){let a=i;a.id=i.name,a.cssStyles=i.cssStyles,a.cssClasses=i.classes.join(" "),a.shape="requirementBox",a.look=e.look,r.push(a)}for(let i of this.elements.values()){let a=i;a.shape="requirementBox",a.look=e.look,a.id=i.name,a.cssStyles=i.cssStyles,a.cssClasses=i.classes.join(" "),r.push(a)}for(let i of this.relations){let a=0,s=i.type===this.Relationships.CONTAINS,l={id:`${i.src}-${i.dst}-${a}`,start:this.requirements.get(i.src)?.name??this.elements.get(i.src)?.name,end:this.requirements.get(i.dst)?.name??this.elements.get(i.dst)?.name,label:`<<${i.type}>>`,classes:"relationshipLine",style:["fill:none",s?"":"stroke-dasharray: 10,7"],labelpos:"c",thickness:"normal",type:"normal",pattern:s?"normal":"dashed",arrowTypeStart:s?"requirement_contains":"",arrowTypeEnd:s?"":"requirement_arrow",look:e.look};n.push(l),a++}return{nodes:r,edges:n,other:{},config:e,direction:this.getDirection()}}}});var ZGe,tfe,rfe=N(()=>{"use strict";ZGe=o(t=>` +`+V+"^"},"showPosition"),test_match:o(function(oe,V){var we,W,pe;if(this.options.backtrack_lexer&&(pe={yylineno:this.yylineno,yylloc:{first_line:this.yylloc.first_line,last_line:this.last_line,first_column:this.yylloc.first_column,last_column:this.yylloc.last_column},yytext:this.yytext,match:this.match,matches:this.matches,matched:this.matched,yyleng:this.yyleng,offset:this.offset,_more:this._more,_input:this._input,yy:this.yy,conditionStack:this.conditionStack.slice(0),done:this.done},this.options.ranges&&(pe.yylloc.range=this.yylloc.range.slice(0))),W=oe[0].match(/(?:\r\n?|\n).*/g),W&&(this.yylineno+=W.length),this.yylloc={first_line:this.yylloc.last_line,last_line:this.yylineno+1,first_column:this.yylloc.last_column,last_column:W?W[W.length-1].length-W[W.length-1].match(/\r?\n?/)[0].length:this.yylloc.last_column+oe[0].length},this.yytext+=oe[0],this.match+=oe[0],this.matches=oe,this.yyleng=this.yytext.length,this.options.ranges&&(this.yylloc.range=[this.offset,this.offset+=this.yyleng]),this._more=!1,this._backtrack=!1,this._input=this._input.slice(oe[0].length),this.matched+=oe[0],we=this.performAction.call(this,this.yy,this,V,this.conditionStack[this.conditionStack.length-1]),this.done&&this._input&&(this.done=!1),we)return we;if(this._backtrack){for(var ve in pe)this[ve]=pe[ve];return!1}return!1},"test_match"),next:o(function(){if(this.done)return this.EOF;this._input||(this.done=!0);var oe,V,we,W;this._more||(this.yytext="",this.match="");for(var pe=this._currentRules(),ve=0;veV[0].length)){if(V=we,W=ve,this.options.backtrack_lexer){if(oe=this.test_match(we,pe[ve]),oe!==!1)return oe;if(this._backtrack){V=!1;continue}else return!1}else if(!this.options.flex)break}return V?(oe=this.test_match(V,pe[W]),oe!==!1?oe:!1):this._input===""?this.EOF:this.parseError("Lexical error on line "+(this.yylineno+1)+`. Unrecognized text. +`+this.showPosition(),{text:"",token:null,line:this.yylineno})},"next"),lex:o(function(){var V=this.next();return V||this.lex()},"lex"),begin:o(function(V){this.conditionStack.push(V)},"begin"),popState:o(function(){var V=this.conditionStack.length-1;return V>0?this.conditionStack.pop():this.conditionStack[0]},"popState"),_currentRules:o(function(){return this.conditionStack.length&&this.conditionStack[this.conditionStack.length-1]?this.conditions[this.conditionStack[this.conditionStack.length-1]].rules:this.conditions.INITIAL.rules},"_currentRules"),topState:o(function(V){return V=this.conditionStack.length-1-Math.abs(V||0),V>=0?this.conditionStack[V]:"INITIAL"},"topState"),pushState:o(function(V){this.begin(V)},"pushState"),stateStackSize:o(function(){return this.conditionStack.length},"stateStackSize"),options:{"case-insensitive":!0},performAction:o(function(V,we,W,pe){var ve=pe;switch(W){case 0:return"title";case 1:return this.begin("acc_title"),9;break;case 2:return this.popState(),"acc_title_value";break;case 3:return this.begin("acc_descr"),11;break;case 4:return this.popState(),"acc_descr_value";break;case 5:this.begin("acc_descr_multiline");break;case 6:this.popState();break;case 7:return"acc_descr_multiline_value";case 8:return 21;case 9:return 22;case 10:return 23;case 11:return 24;case 12:return 5;case 13:break;case 14:break;case 15:break;case 16:return 8;case 17:return 6;case 18:return 27;case 19:return 40;case 20:return 29;case 21:return 32;case 22:return 31;case 23:return 34;case 24:return 36;case 25:return 38;case 26:return 41;case 27:return 42;case 28:return 43;case 29:return 44;case 30:return 45;case 31:return 46;case 32:return 47;case 33:return 48;case 34:return 49;case 35:return 50;case 36:return 51;case 37:return 52;case 38:return 53;case 39:return 54;case 40:return 65;case 41:return 66;case 42:return 67;case 43:return 68;case 44:return 69;case 45:return 70;case 46:return 71;case 47:return 57;case 48:return 59;case 49:return this.begin("style"),77;break;case 50:return 75;case 51:return 81;case 52:return 88;case 53:return"PERCENT";case 54:return 86;case 55:return 84;case 56:break;case 57:this.begin("string");break;case 58:this.popState();break;case 59:return this.begin("style"),72;break;case 60:return this.begin("style"),74;break;case 61:return 61;case 62:return 64;case 63:return 63;case 64:this.begin("string");break;case 65:this.popState();break;case 66:return"qString";case 67:return we.yytext=we.yytext.trim(),89;break;case 68:return 75;case 69:return 80;case 70:return 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36:Z[ce-1].unshift({type:"optStart",optText:se.parseMessage(Z[ce-2]),signalType:se.LINETYPE.OPT_START}),Z[ce-1].push({type:"optEnd",optText:se.parseMessage(Z[ce-2]),signalType:se.LINETYPE.OPT_END}),this.$=Z[ce-1];break;case 37:Z[ce-1].unshift({type:"altStart",altText:se.parseMessage(Z[ce-2]),signalType:se.LINETYPE.ALT_START}),Z[ce-1].push({type:"altEnd",signalType:se.LINETYPE.ALT_END}),this.$=Z[ce-1];break;case 38:Z[ce-1].unshift({type:"parStart",parText:se.parseMessage(Z[ce-2]),signalType:se.LINETYPE.PAR_START}),Z[ce-1].push({type:"parEnd",signalType:se.LINETYPE.PAR_END}),this.$=Z[ce-1];break;case 39:Z[ce-1].unshift({type:"parStart",parText:se.parseMessage(Z[ce-2]),signalType:se.LINETYPE.PAR_OVER_START}),Z[ce-1].push({type:"parEnd",signalType:se.LINETYPE.PAR_END}),this.$=Z[ce-1];break;case 40:Z[ce-1].unshift({type:"criticalStart",criticalText:se.parseMessage(Z[ce-2]),signalType:se.LINETYPE.CRITICAL_START}),Z[ce-1].push({type:"criticalEnd",signalType:se.LINETYPE.CRITICAL_END}),this.$=Z[ce-1];break;case 41:Z[ce-1].unshift({type:"breakStart",breakText:se.parseMessage(Z[ce-2]),signalType:se.LINETYPE.BREAK_START}),Z[ce-1].push({type:"breakEnd",optText:se.parseMessage(Z[ce-2]),signalType:se.LINETYPE.BREAK_END}),this.$=Z[ce-1];break;case 43:this.$=Z[ce-3].concat([{type:"option",optionText:se.parseMessage(Z[ce-1]),signalType:se.LINETYPE.CRITICAL_OPTION},Z[ce]]);break;case 45:this.$=Z[ce-3].concat([{type:"and",parText:se.parseMessage(Z[ce-1]),signalType:se.LINETYPE.PAR_AND},Z[ce]]);break;case 47:this.$=Z[ce-3].concat([{type:"else",altText:se.parseMessage(Z[ce-1]),signalType:se.LINETYPE.ALT_ELSE},Z[ce]]);break;case 48:Z[ce-3].draw="participant",Z[ce-3].type="addParticipant",Z[ce-3].description=se.parseMessage(Z[ce-1]),this.$=Z[ce-3];break;case 49:Z[ce-1].draw="participant",Z[ce-1].type="addParticipant",this.$=Z[ce-1];break;case 50:Z[ce-3].draw="actor",Z[ce-3].type="addParticipant",Z[ce-3].description=se.parseMessage(Z[ce-1]),this.$=Z[ce-3];break;case 51:Z[ce-1].draw="actor",Z[ce-1].type="addParticipant",this.$=Z[ce-1];break;case 52:Z[ce-1].type="destroyParticipant",this.$=Z[ce-1];break;case 53:this.$=[Z[ce-1],{type:"addNote",placement:Z[ce-2],actor:Z[ce-1].actor,text:Z[ce]}];break;case 54:Z[ce-2]=[].concat(Z[ce-1],Z[ce-1]).slice(0,2),Z[ce-2][0]=Z[ce-2][0].actor,Z[ce-2][1]=Z[ce-2][1].actor,this.$=[Z[ce-1],{type:"addNote",placement:se.PLACEMENT.OVER,actor:Z[ce-2].slice(0,2),text:Z[ce]}];break;case 55:this.$=[Z[ce-1],{type:"addLinks",actor:Z[ce-1].actor,text:Z[ce]}];break;case 56:this.$=[Z[ce-1],{type:"addALink",actor:Z[ce-1].actor,text:Z[ce]}];break;case 57:this.$=[Z[ce-1],{type:"addProperties",actor:Z[ce-1].actor,text:Z[ce]}];break;case 58:this.$=[Z[ce-1],{type:"addDetails",actor:Z[ce-1].actor,text:Z[ce]}];break;case 61:this.$=[Z[ce-2],Z[ce]];break;case 62:this.$=Z[ce];break;case 63:this.$=se.PLACEMENT.LEFTOF;break;case 64:this.$=se.PLACEMENT.RIGHTOF;break;case 65:this.$=[Z[ce-4],Z[ce-1],{type:"addMessage",from:Z[ce-4].actor,to:Z[ce-1].actor,signalType:Z[ce-3],msg:Z[ce],activate:!0},{type:"activeStart",signalType:se.LINETYPE.ACTIVE_START,actor:Z[ce-1].actor}];break;case 66:this.$=[Z[ce-4],Z[ce-1],{type:"addMessage",from:Z[ce-4].actor,to:Z[ce-1].actor,signalType:Z[ce-3],msg:Z[ce]},{type:"activeEnd",signalType:se.LINETYPE.ACTIVE_END,actor:Z[ce-4].actor}];break;case 67:this.$=[Z[ce-3],Z[ce-1],{type:"addMessage",from:Z[ce-3].actor,to:Z[ce-1].actor,signalType:Z[ce-2],msg:Z[ce]}];break;case 68:this.$={type:"addParticipant",actor:Z[ce]};break;case 69:this.$=se.LINETYPE.SOLID_OPEN;break;case 70:this.$=se.LINETYPE.DOTTED_OPEN;break;case 71:this.$=se.LINETYPE.SOLID;break;case 72:this.$=se.LINETYPE.BIDIRECTIONAL_SOLID;break;case 73:this.$=se.LINETYPE.DOTTED;break;case 74:this.$=se.LINETYPE.BIDIRECTIONAL_DOTTED;break;case 75:this.$=se.LINETYPE.SOLID_CROSS;break;case 76:this.$=se.LINETYPE.DOTTED_CROSS;break;case 77:this.$=se.LINETYPE.SOLID_POINT;break;case 78:this.$=se.LINETYPE.DOTTED_POINT;break;case 79:this.$=se.parseMessage(Z[ce].trim().substring(1));break}},"anonymous"),table:[{3:1,4:e,5:r,6:n},{1:[3]},{3:5,4:e,5:r,6:n},{3:6,4:e,5:r,6:n},t([1,4,5,13,14,18,21,23,29,30,31,33,35,36,37,38,39,41,43,44,46,50,52,53,54,59,60,61,62,70],i,{7:7}),{1:[2,1]},{1:[2,2]},{1:[2,3],4:a,5:s,8:8,9:10,12:12,13:l,14:u,17:15,18:h,21:f,22:40,23:d,24:19,25:20,26:21,27:22,28:23,29:p,30:m,31:g,33:y,35:v,36:x,37:b,38:w,39:C,41:T,43:E,44:A,46:S,50:_,52:I,53:D,54:k,59:L,60:R,61:O,62:M,70:B},t(F,[2,5]),{9:47,12:12,13:l,14:u,17:15,18:h,21:f,22:40,23:d,24:19,25:20,26:21,27:22,28:23,29:p,30:m,31:g,33:y,35:v,36:x,37:b,38:w,39:C,41:T,43:E,44:A,46:S,50:_,52:I,53:D,54:k,59:L,60:R,61:O,62:M,70:B},t(F,[2,7]),t(F,[2,8]),t(F,[2,14]),{12:48,50:_,52:I,53:D},{15:[1,49]},{5:[1,50]},{5:[1,53],19:[1,51],20:[1,52]},{22:54,70:B},{22:55,70:B},{5:[1,56]},{5:[1,57]},{5:[1,58]},{5:[1,59]},{5:[1,60]},t(F,[2,29]),t(F,[2,30]),{32:[1,61]},{34:[1,62]},t(F,[2,33]),{15:[1,63]},{15:[1,64]},{15:[1,65]},{15:[1,66]},{15:[1,67]},{15:[1,68]},{15:[1,69]},{15:[1,70]},{22:71,70:B},{22:72,70:B},{22:73,70:B},{67:74,71:[1,75],72:[1,76],73:[1,77],74:[1,78],75:[1,79],76:[1,80],77:[1,81],78:[1,82],79:[1,83],80:[1,84]},{55:85,57:[1,86],65:[1,87],66:[1,88]},{22:89,70:B},{22:90,70:B},{22:91,70:B},{22:92,70:B},t([5,51,64,71,72,73,74,75,76,77,78,79,80,81],[2,68]),t(F,[2,6]),t(F,[2,15]),t(P,[2,9],{10:93}),t(F,[2,17]),{5:[1,95],19:[1,94]},{5:[1,96]},t(F,[2,21]),{5:[1,97]},{5:[1,98]},t(F,[2,24]),t(F,[2,25]),t(F,[2,26]),t(F,[2,27]),t(F,[2,28]),t(F,[2,31]),t(F,[2,32]),t(z,i,{7:99}),t(z,i,{7:100}),t(z,i,{7:101}),t($,i,{40:102,7:103}),t(H,i,{42:104,7:105}),t(H,i,{7:105,42:106}),t(Q,i,{45:107,7:108}),t(z,i,{7:109}),{5:[1,111],51:[1,110]},{5:[1,113],51:[1,112]},{5:[1,114]},{22:117,68:[1,115],69:[1,116],70:B},t(j,[2,69]),t(j,[2,70]),t(j,[2,71]),t(j,[2,72]),t(j,[2,73]),t(j,[2,74]),t(j,[2,75]),t(j,[2,76]),t(j,[2,77]),t(j,[2,78]),{22:118,70:B},{22:120,58:119,70:B},{70:[2,63]},{70:[2,64]},{56:121,81:ie},{56:123,81:ie},{56:124,81:ie},{56:125,81:ie},{4:[1,128],5:[1,130],11:127,12:129,16:[1,126],50:_,52:I,53:D},{5:[1,131]},t(F,[2,19]),t(F,[2,20]),t(F,[2,22]),t(F,[2,23]),{4:a,5:s,8:8,9:10,12:12,13:l,14:u,16:[1,132],17:15,18:h,21:f,22:40,23:d,24:19,25:20,26:21,27:22,28:23,29:p,30:m,31:g,33:y,35:v,36:x,37:b,38:w,39:C,41:T,43:E,44:A,46:S,50:_,52:I,53:D,54:k,59:L,60:R,61:O,62:M,70:B},{4:a,5:s,8:8,9:10,12:12,13:l,14:u,16:[1,133],17:15,18:h,21:f,22:40,23:d,24:19,25:20,26:21,27:22,28:23,29:p,30:m,31:g,33:y,35:v,36:x,37:b,38:w,39:C,41:T,43:E,44:A,46:S,50:_,52:I,53:D,54:k,59:L,60:R,61:O,62:M,70:B},{4:a,5:s,8:8,9:10,12:12,13:l,14:u,16:[1,134],17:15,18:h,21:f,22:40,23:d,24:19,25:20,26:21,27:22,28:23,29:p,30:m,31:g,33:y,35:v,36:x,37:b,38:w,39:C,41:T,43:E,44:A,46:S,50:_,52:I,53:D,54:k,59:L,60:R,61:O,62:M,70:B},{16:[1,135]},{4:a,5:s,8:8,9:10,12:12,13:l,14:u,16:[2,46],17:15,18:h,21:f,22:40,23:d,24:19,25:20,26:21,27:22,28:23,29:p,30:m,31:g,33:y,35:v,36:x,37:b,38:w,39:C,41:T,43:E,44:A,46:S,49:[1,136],50:_,52:I,53:D,54:k,59:L,60:R,61:O,62:M,70:B},{16:[1,137]},{4:a,5:s,8:8,9:10,12:12,13:l,14:u,16:[2,44],17:15,18:h,21:f,22:40,23:d,24:19,25:20,26:21,27:22,28:23,29:p,30:m,31:g,33:y,35:v,36:x,37:b,38:w,39:C,41:T,43:E,44:A,46:S,48:[1,138],50:_,52:I,53:D,54:k,59:L,60:R,61:O,62:M,70:B},{16:[1,139]},{16:[1,140]},{4:a,5:s,8:8,9:10,12:12,13:l,14:u,16:[2,42],17:15,18:h,21:f,22:40,23:d,24:19,25:20,26:21,27:22,28:23,29:p,30:m,31:g,33:y,35:v,36:x,37:b,38:w,39:C,41:T,43:E,44:A,46:S,47:[1,141],50:_,52:I,53:D,54:k,59:L,60:R,61:O,62:M,70:B},{4:a,5:s,8:8,9:10,12:12,13:l,14:u,16:[1,142],17:15,18:h,21:f,22:40,23:d,24:19,25:20,26:21,27:22,28:23,29:p,30:m,31:g,33:y,35:v,36:x,37:b,38:w,39:C,41:T,43:E,44:A,46:S,50:_,52:I,53:D,54:k,59:L,60:R,61:O,62:M,70:B},{15:[1,143]},t(F,[2,49]),{15:[1,144]},t(F,[2,51]),t(F,[2,52]),{22:145,70:B},{22:146,70:B},{56:147,81:ie},{56:148,81:ie},{56:149,81:ie},{64:[1,150],81:[2,62]},{5:[2,55]},{5:[2,79]},{5:[2,56]},{5:[2,57]},{5:[2,58]},t(F,[2,16]),t(P,[2,10]),{12:151,50:_,52:I,53:D},t(P,[2,12]),t(P,[2,13]),t(F,[2,18]),t(F,[2,34]),t(F,[2,35]),t(F,[2,36]),t(F,[2,37]),{15:[1,152]},t(F,[2,38]),{15:[1,153]},t(F,[2,39]),t(F,[2,40]),{15:[1,154]},t(F,[2,41]),{5:[1,155]},{5:[1,156]},{56:157,81:ie},{56:158,81:ie},{5:[2,67]},{5:[2,53]},{5:[2,54]},{22:159,70:B},t(P,[2,11]),t($,i,{7:103,40:160}),t(H,i,{7:105,42:161}),t(Q,i,{7:108,45:162}),t(F,[2,48]),t(F,[2,50]),{5:[2,65]},{5:[2,66]},{81:[2,61]},{16:[2,47]},{16:[2,45]},{16:[2,43]}],defaultActions:{5:[2,1],6:[2,2],87:[2,63],88:[2,64],121:[2,55],122:[2,79],123:[2,56],124:[2,57],125:[2,58],147:[2,67],148:[2,53],149:[2,54],157:[2,65],158:[2,66],159:[2,61],160:[2,47],161:[2,45],162:[2,43]},parseError:o(function(X,te){if(te.recoverable)this.trace(X);else{var J=new Error(X);throw J.hash=te,J}},"parseError"),parse:o(function(X){var te=this,J=[0],se=[],ue=[null],Z=[],Se=this.table,ce="",ae=0,Oe=0,ge=0,ze=2,He=1,$e=Z.slice.call(arguments,1),Re=Object.create(this.lexer),Ie={yy:{}};for(var be in this.yy)Object.prototype.hasOwnProperty.call(this.yy,be)&&(Ie.yy[be]=this.yy[be]);Re.setInput(X,Ie.yy),Ie.yy.lexer=Re,Ie.yy.parser=this,typeof Re.yylloc>"u"&&(Re.yylloc={});var W=Re.yylloc;Z.push(W);var de=Re.options&&Re.options.ranges;typeof Ie.yy.parseError=="function"?this.parseError=Ie.yy.parseError:this.parseError=Object.getPrototypeOf(this).parseError;function re(Rt){J.length=J.length-2*Rt,ue.length=ue.length-Rt,Z.length=Z.length-Rt}o(re,"popStack");function oe(){var Rt;return Rt=se.pop()||Re.lex()||He,typeof Rt!="number"&&(Rt instanceof Array&&(se=Rt,Rt=se.pop()),Rt=te.symbols_[Rt]||Rt),Rt}o(oe,"lex");for(var V,xe,q,pe,ve,Pe,_e={},we,Ve,De,qe;;){if(q=J[J.length-1],this.defaultActions[q]?pe=this.defaultActions[q]:((V===null||typeof V>"u")&&(V=oe()),pe=Se[q]&&Se[q][V]),typeof pe>"u"||!pe.length||!pe[0]){var at="";qe=[];for(we in Se[q])this.terminals_[we]&&we>ze&&qe.push("'"+this.terminals_[we]+"'");Re.showPosition?at="Parse error on line "+(ae+1)+`: -`+Re.showPosition()+` -Expecting `+qe.join(", ")+", got '"+(this.terminals_[V]||V)+"'":at="Parse error on line "+(ae+1)+": Unexpected "+(V==He?"end of input":"'"+(this.terminals_[V]||V)+"'"),this.parseError(at,{text:Re.match,token:this.terminals_[V]||V,line:Re.yylineno,loc:W,expected:qe})}if(pe[0]instanceof Array&&pe.length>1)throw new Error("Parse Error: multiple actions possible at state: "+q+", token: "+V);switch(pe[0]){case 1:J.push(V),ue.push(Re.yytext),Z.push(Re.yylloc),J.push(pe[1]),V=null,xe?(V=xe,xe=null):(Oe=Re.yyleng,ce=Re.yytext,ae=Re.yylineno,W=Re.yylloc,ge>0&&ge--);break;case 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this.yy=te||this.yy||{},this._input=X,this._more=this._backtrack=this.done=!1,this.yylineno=this.yyleng=0,this.yytext=this.matched=this.match="",this.conditionStack=["INITIAL"],this.yylloc={first_line:1,first_column:0,last_line:1,last_column:0},this.options.ranges&&(this.yylloc.range=[0,0]),this.offset=0,this},"setInput"),input:o(function(){var X=this._input[0];this.yytext+=X,this.yyleng++,this.offset++,this.match+=X,this.matched+=X;var te=X.match(/(?:\r\n?|\n).*/g);return te?(this.yylineno++,this.yylloc.last_line++):this.yylloc.last_column++,this.options.ranges&&this.yylloc.range[1]++,this._input=this._input.slice(1),X},"input"),unput:o(function(X){var te=X.length,J=X.split(/(?:\r\n?|\n)/g);this._input=X+this._input,this.yytext=this.yytext.substr(0,this.yytext.length-te),this.offset-=te;var se=this.match.split(/(?:\r\n?|\n)/g);this.match=this.match.substr(0,this.match.length-1),this.matched=this.matched.substr(0,this.matched.length-1),J.length-1&&(this.yylineno-=J.length-1);var ue=this.yylloc.range;return this.yylloc={first_line:this.yylloc.first_line,last_line:this.yylineno+1,first_column:this.yylloc.first_column,last_column:J?(J.length===se.length?this.yylloc.first_column:0)+se[se.length-J.length].length-J[0].length:this.yylloc.first_column-te},this.options.ranges&&(this.yylloc.range=[ue[0],ue[0]+this.yyleng-te]),this.yyleng=this.yytext.length,this},"unput"),more:o(function(){return this._more=!0,this},"more"),reject:o(function(){if(this.options.backtrack_lexer)this._backtrack=!0;else return this.parseError("Lexical error on line "+(this.yylineno+1)+`. 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4:break;case 5:break;case 6:return 19;case 7:return this.begin("LINE"),14;break;case 8:return this.begin("ID"),50;break;case 9:return this.begin("ID"),52;break;case 10:return 13;case 11:return this.begin("ID"),53;break;case 12:return J.yytext=J.yytext.trim(),this.begin("ALIAS"),70;break;case 13:return this.popState(),this.popState(),this.begin("LINE"),51;break;case 14:return this.popState(),this.popState(),5;break;case 15:return this.begin("LINE"),36;break;case 16:return this.begin("LINE"),37;break;case 17:return this.begin("LINE"),38;break;case 18:return this.begin("LINE"),39;break;case 19:return this.begin("LINE"),49;break;case 20:return this.begin("LINE"),41;break;case 21:return this.begin("LINE"),43;break;case 22:return this.begin("LINE"),48;break;case 23:return this.begin("LINE"),44;break;case 24:return this.begin("LINE"),47;break;case 25:return this.begin("LINE"),46;break;case 26:return this.popState(),15;break;case 27:return 16;case 28:return 65;case 29:return 66;case 30:return 59;case 31:return 60;case 32:return 61;case 33:return 62;case 34:return 57;case 35:return 54;case 36:return this.begin("ID"),21;break;case 37:return this.begin("ID"),23;break;case 38:return 29;case 39:return 30;case 40:return this.begin("acc_title"),31;break;case 41:return this.popState(),"acc_title_value";break;case 42:return this.begin("acc_descr"),33;break;case 43:return this.popState(),"acc_descr_value";break;case 44:this.begin("acc_descr_multiline");break;case 45:this.popState();break;case 46:return"acc_descr_multiline_value";case 47:return 6;case 48:return 18;case 49:return 20;case 50:return 64;case 51:return 5;case 52:return J.yytext=J.yytext.trim(),70;break;case 53:return 73;case 54:return 74;case 55:return 75;case 56:return 76;case 57:return 71;case 58:return 72;case 59:return 77;case 60:return 78;case 61:return 79;case 62:return 80;case 63:return 81;case 64:return 68;case 65:return 69;case 66:return 5;case 67:return"INVALID"}},"anonymous"),rules:[/^(?:[\n]+)/i,/^(?:\s+)/i,/^(?:((?!\n)\s)+)/i,/^(?:#[^\n]*)/i,/^(?:%(?!\{)[^\n]*)/i,/^(?:[^\}]%%[^\n]*)/i,/^(?:[0-9]+(?=[ \n]+))/i,/^(?:box\b)/i,/^(?:participant\b)/i,/^(?:actor\b)/i,/^(?:create\b)/i,/^(?:destroy\b)/i,/^(?:[^\<->\->:\n,;]+?([\-]*[^\<->\->:\n,;]+?)*?(?=((?!\n)\s)+as(?!\n)\s|[#\n;]|$))/i,/^(?:as\b)/i,/^(?:(?:))/i,/^(?:loop\b)/i,/^(?:rect\b)/i,/^(?:opt\b)/i,/^(?:alt\b)/i,/^(?:else\b)/i,/^(?:par\b)/i,/^(?:par_over\b)/i,/^(?:and\b)/i,/^(?:critical\b)/i,/^(?:option\b)/i,/^(?:break\b)/i,/^(?:(?:[:]?(?:no)?wrap)?[^#\n;]*)/i,/^(?:end\b)/i,/^(?:left of\b)/i,/^(?:right of\b)/i,/^(?:links\b)/i,/^(?:link\b)/i,/^(?:properties\b)/i,/^(?:details\b)/i,/^(?:over\b)/i,/^(?:note\b)/i,/^(?:activate\b)/i,/^(?:deactivate\b)/i,/^(?:title\s[^#\n;]+)/i,/^(?:title:\s[^#\n;]+)/i,/^(?:accTitle\s*:\s*)/i,/^(?:(?!\n||)*[^\n]*)/i,/^(?:accDescr\s*:\s*)/i,/^(?:(?!\n||)*[^\n]*)/i,/^(?:accDescr\s*\{\s*)/i,/^(?:[\}])/i,/^(?:[^\}]*)/i,/^(?:sequenceDiagram\b)/i,/^(?:autonumber\b)/i,/^(?:off\b)/i,/^(?:,)/i,/^(?:;)/i,/^(?:[^\+\<->\->:\n,;]+((?!(-x|--x|-\)|--\)))[\-]*[^\+\<->\->:\n,;]+)*)/i,/^(?:->>)/i,/^(?:<<->>)/i,/^(?:-->>)/i,/^(?:<<-->>)/i,/^(?:->)/i,/^(?:-->)/i,/^(?:-[x])/i,/^(?:--[x])/i,/^(?:-[\)])/i,/^(?:--[\)])/i,/^(?::(?:(?:no)?wrap)?[^#\n;]+)/i,/^(?:\+)/i,/^(?:-)/i,/^(?:$)/i,/^(?:.)/i],conditions:{acc_descr_multiline:{rules:[45,46],inclusive:!1},acc_descr:{rules:[43],inclusive:!1},acc_title:{rules:[41],inclusive:!1},ID:{rules:[2,3,12],inclusive:!1},ALIAS:{rules:[2,3,13,14],inclusive:!1},LINE:{rules:[2,3,26],inclusive:!1},INITIAL:{rules:[0,1,3,4,5,6,7,8,9,10,11,15,16,17,18,19,20,21,22,23,24,25,27,28,29,30,31,32,33,34,35,36,37,38,39,40,42,44,47,48,49,50,51,52,53,54,55,56,57,58,59,60,61,62,63,64,65,66,67],inclusive:!0}}};return K}();ne.lexer=le;function he(){this.yy={}}return o(he,"Parser"),he.prototype=ne,ne.Parser=he,new he}();CO.parser=CO;lfe=CO});var iVe,aVe,sVe,_6,ufe=N(()=>{"use strict";zt();vt();s6();gr();mi();iVe={SOLID:0,DOTTED:1,NOTE:2,SOLID_CROSS:3,DOTTED_CROSS:4,SOLID_OPEN:5,DOTTED_OPEN:6,LOOP_START:10,LOOP_END:11,ALT_START:12,ALT_ELSE:13,ALT_END:14,OPT_START:15,OPT_END:16,ACTIVE_START:17,ACTIVE_END:18,PAR_START:19,PAR_AND:20,PAR_END:21,RECT_START:22,RECT_END:23,SOLID_POINT:24,DOTTED_POINT:25,AUTONUMBER:26,CRITICAL_START:27,CRITICAL_OPTION:28,CRITICAL_END:29,BREAK_START:30,BREAK_END:31,PAR_OVER_START:32,BIDIRECTIONAL_SOLID:33,BIDIRECTIONAL_DOTTED:34},aVe={FILLED:0,OPEN:1},sVe={LEFTOF:0,RIGHTOF:1,OVER:2},_6=class{constructor(){this.state=new pf(()=>({prevActor:void 0,actors:new Map,createdActors:new Map,destroyedActors:new Map,boxes:[],messages:[],notes:[],sequenceNumbersEnabled:!1,wrapEnabled:void 0,currentBox:void 0,lastCreated:void 0,lastDestroyed:void 0}));this.setAccTitle=Lr;this.setAccDescription=Nr;this.setDiagramTitle=$r;this.getAccTitle=Rr;this.getAccDescription=Mr;this.getDiagramTitle=Ir;this.apply=this.apply.bind(this),this.parseBoxData=this.parseBoxData.bind(this),this.parseMessage=this.parseMessage.bind(this),this.clear(),this.setWrap(me().wrap),this.LINETYPE=iVe,this.ARROWTYPE=aVe,this.PLACEMENT=sVe}static{o(this,"SequenceDB")}addBox(e){this.state.records.boxes.push({name:e.text,wrap:e.wrap??this.autoWrap(),fill:e.color,actorKeys:[]}),this.state.records.currentBox=this.state.records.boxes.slice(-1)[0]}addActor(e,r,n,i){let a=this.state.records.currentBox,s=this.state.records.actors.get(e);if(s){if(this.state.records.currentBox&&s.box&&this.state.records.currentBox!==s.box)throw new Error(`A same participant should only be defined in one Box: ${s.name} can't be in '${s.box.name}' and in '${this.state.records.currentBox.name}' at the same time.`);if(a=s.box?s.box:this.state.records.currentBox,s.box=a,s&&r===s.name&&n==null)return}if(n?.text==null&&(n={text:r,type:i}),(i==null||n.text==null)&&(n={text:r,type:i}),this.state.records.actors.set(e,{box:a,name:r,description:n.text,wrap:n.wrap??this.autoWrap(),prevActor:this.state.records.prevActor,links:{},properties:{},actorCnt:null,rectData:null,type:i??"participant"}),this.state.records.prevActor){let l=this.state.records.actors.get(this.state.records.prevActor);l&&(l.nextActor=e)}this.state.records.currentBox&&this.state.records.currentBox.actorKeys.push(e),this.state.records.prevActor=e}activationCount(e){let r,n=0;if(!e)return 0;for(r=0;r>-",token:"->>-",line:"1",loc:{first_line:1,last_line:1,first_column:1,last_column:1},expected:["'ACTIVE_PARTICIPANT'"]},l}return this.state.records.messages.push({id:this.state.records.messages.length.toString(),from:e,to:r,message:n?.text??"",wrap:n?.wrap??this.autoWrap(),type:i,activate:a}),!0}hasAtLeastOneBox(){return this.state.records.boxes.length>0}hasAtLeastOneBoxWithTitle(){return this.state.records.boxes.some(e=>e.name)}getMessages(){return this.state.records.messages}getBoxes(){return this.state.records.boxes}getActors(){return this.state.records.actors}getCreatedActors(){return this.state.records.createdActors}getDestroyedActors(){return this.state.records.destroyedActors}getActor(e){return this.state.records.actors.get(e)}getActorKeys(){return[...this.state.records.actors.keys()]}enableSequenceNumbers(){this.state.records.sequenceNumbersEnabled=!0}disableSequenceNumbers(){this.state.records.sequenceNumbersEnabled=!1}showSequenceNumbers(){return this.state.records.sequenceNumbersEnabled}setWrap(e){this.state.records.wrapEnabled=e}extractWrap(e){if(e===void 0)return{};e=e.trim();let r=/^:?wrap:/.exec(e)!==null?!0:/^:?nowrap:/.exec(e)!==null?!1:void 0;return{cleanedText:(r===void 0?e:e.replace(/^:?(?:no)?wrap:/,"")).trim(),wrap:r}}autoWrap(){return this.state.records.wrapEnabled!==void 0?this.state.records.wrapEnabled:me().sequence?.wrap??!1}clear(){this.state.reset(),Ar()}parseMessage(e){let r=e.trim(),{wrap:n,cleanedText:i}=this.extractWrap(r),a={text:i,wrap:n};return Y.debug(`parseMessage: ${JSON.stringify(a)}`),a}parseBoxData(e){let r=/^((?:rgba?|hsla?)\s*\(.*\)|\w*)(.*)$/.exec(e),n=r?.[1]?r[1].trim():"transparent",i=r?.[2]?r[2].trim():void 0;if(window?.CSS)window.CSS.supports("color",n)||(n="transparent",i=e.trim());else{let l=new Option().style;l.color=n,l.color!==n&&(n="transparent",i=e.trim())}let{wrap:a,cleanedText:s}=this.extractWrap(i);return{text:s?Tr(s,me()):void 0,color:n,wrap:a}}addNote(e,r,n){let i={actor:e,placement:r,message:n.text,wrap:n.wrap??this.autoWrap()},a=[].concat(e,e);this.state.records.notes.push(i),this.state.records.messages.push({id:this.state.records.messages.length.toString(),from:a[0],to:a[1],message:n.text,wrap:n.wrap??this.autoWrap(),type:this.LINETYPE.NOTE,placement:r})}addLinks(e,r){let n=this.getActor(e);try{let i=Tr(r.text,me());i=i.replace(/=/g,"="),i=i.replace(/&/g,"&");let a=JSON.parse(i);this.insertLinks(n,a)}catch(i){Y.error("error while parsing actor link text",i)}}addALink(e,r){let n=this.getActor(e);try{let i={},a=Tr(r.text,me()),s=a.indexOf("@");a=a.replace(/=/g,"="),a=a.replace(/&/g,"&");let l=a.slice(0,s-1).trim(),u=a.slice(s+1).trim();i[l]=u,this.insertLinks(n,i)}catch(i){Y.error("error while parsing actor link text",i)}}insertLinks(e,r){if(e.links==null)e.links=r;else for(let n in r)e.links[n]=r[n]}addProperties(e,r){let n=this.getActor(e);try{let i=Tr(r.text,me()),a=JSON.parse(i);this.insertProperties(n,a)}catch(i){Y.error("error while parsing actor properties text",i)}}insertProperties(e,r){if(e.properties==null)e.properties=r;else for(let n in r)e.properties[n]=r[n]}boxEnd(){this.state.records.currentBox=void 0}addDetails(e,r){let n=this.getActor(e),i=document.getElementById(r.text);try{let a=i.innerHTML,s=JSON.parse(a);s.properties&&this.insertProperties(n,s.properties),s.links&&this.insertLinks(n,s.links)}catch(a){Y.error("error while parsing actor details text",a)}}getActorProperty(e,r){if(e?.properties!==void 0)return e.properties[r]}apply(e){if(Array.isArray(e))e.forEach(r=>{this.apply(r)});else switch(e.type){case"sequenceIndex":this.state.records.messages.push({id:this.state.records.messages.length.toString(),from:void 0,to:void 0,message:{start:e.sequenceIndex,step:e.sequenceIndexStep,visible:e.sequenceVisible},wrap:!1,type:e.signalType});break;case"addParticipant":this.addActor(e.actor,e.actor,e.description,e.draw);break;case"createParticipant":if(this.state.records.actors.has(e.actor))throw new Error("It is not possible to have actors with the same id, even if one is destroyed before the next is created. Use 'AS' aliases to simulate the behavior");this.state.records.lastCreated=e.actor,this.addActor(e.actor,e.actor,e.description,e.draw),this.state.records.createdActors.set(e.actor,this.state.records.messages.length);break;case"destroyParticipant":this.state.records.lastDestroyed=e.actor,this.state.records.destroyedActors.set(e.actor,this.state.records.messages.length);break;case"activeStart":this.addSignal(e.actor,void 0,void 0,e.signalType);break;case"activeEnd":this.addSignal(e.actor,void 0,void 0,e.signalType);break;case"addNote":this.addNote(e.actor,e.placement,e.text);break;case"addLinks":this.addLinks(e.actor,e.text);break;case"addALink":this.addALink(e.actor,e.text);break;case"addProperties":this.addProperties(e.actor,e.text);break;case"addDetails":this.addDetails(e.actor,e.text);break;case"addMessage":if(this.state.records.lastCreated){if(e.to!==this.state.records.lastCreated)throw new Error("The created participant "+this.state.records.lastCreated.name+" does not have an associated creating message after its declaration. Please check the sequence diagram.");this.state.records.lastCreated=void 0}else if(this.state.records.lastDestroyed){if(e.to!==this.state.records.lastDestroyed&&e.from!==this.state.records.lastDestroyed)throw new Error("The destroyed participant "+this.state.records.lastDestroyed.name+" does not have an associated destroying message after its declaration. Please check the sequence diagram.");this.state.records.lastDestroyed=void 0}this.addSignal(e.from,e.to,e.msg,e.signalType,e.activate);break;case"boxStart":this.addBox(e.boxData);break;case"boxEnd":this.boxEnd();break;case"loopStart":this.addSignal(void 0,void 0,e.loopText,e.signalType);break;case"loopEnd":this.addSignal(void 0,void 0,void 0,e.signalType);break;case"rectStart":this.addSignal(void 0,void 0,e.color,e.signalType);break;case"rectEnd":this.addSignal(void 0,void 0,void 0,e.signalType);break;case"optStart":this.addSignal(void 0,void 0,e.optText,e.signalType);break;case"optEnd":this.addSignal(void 0,void 0,void 0,e.signalType);break;case"altStart":this.addSignal(void 0,void 0,e.altText,e.signalType);break;case"else":this.addSignal(void 0,void 0,e.altText,e.signalType);break;case"altEnd":this.addSignal(void 0,void 0,void 0,e.signalType);break;case"setAccTitle":Lr(e.text);break;case"parStart":this.addSignal(void 0,void 0,e.parText,e.signalType);break;case"and":this.addSignal(void 0,void 0,e.parText,e.signalType);break;case"parEnd":this.addSignal(void 0,void 0,void 0,e.signalType);break;case"criticalStart":this.addSignal(void 0,void 0,e.criticalText,e.signalType);break;case"option":this.addSignal(void 0,void 0,e.optionText,e.signalType);break;case"criticalEnd":this.addSignal(void 0,void 0,void 0,e.signalType);break;case"breakStart":this.addSignal(void 0,void 0,e.breakText,e.signalType);break;case"breakEnd":this.addSignal(void 0,void 0,void 0,e.signalType);break}}getConfig(){return me().sequence}}});var oVe,hfe,ffe=N(()=>{"use strict";oVe=o(t=>`.actor { +`,"getStyles"),afe=XGe});var LO={};hr(LO,{draw:()=>jGe});var jGe,ofe=N(()=>{"use strict";zt();vt();km();ep();qm();nr();jGe=o(async function(t,e,r,n){X.info("REF0:"),X.info("Drawing requirement diagram (unified)",e);let{securityLevel:i,state:a,layout:s}=me(),l=n.db.getData(),u=xc(e,i);l.type=n.type,l.layoutAlgorithm=lf(s),l.nodeSpacing=a?.nodeSpacing??50,l.rankSpacing=a?.rankSpacing??50,l.markers=["requirement_contains","requirement_arrow"],l.diagramId=e,await _c(l,u);let h=8;Gt.insertTitle(u,"requirementDiagramTitleText",a?.titleTopMargin??25,n.db.getDiagramTitle()),Dc(u,h,"requirementDiagram",a?.useMaxWidth??!0)},"draw")});var lfe={};hr(lfe,{diagram:()=>KGe});var KGe,cfe=N(()=>{"use strict";nfe();ife();sfe();ofe();KGe={parser:rfe,get db(){return new MS},renderer:LO,styles:afe}});var RO,ffe,dfe=N(()=>{"use strict";RO=function(){var t=o(function(K,j,ne,ee){for(ne=ne||{},ee=K.length;ee--;ne[K[ee]]=j);return ne},"o"),e=[1,2],r=[1,3],n=[1,4],i=[2,4],a=[1,9],s=[1,11],l=[1,13],u=[1,14],h=[1,16],f=[1,17],d=[1,18],p=[1,24],m=[1,25],g=[1,26],y=[1,27],v=[1,28],x=[1,29],b=[1,30],w=[1,31],C=[1,32],T=[1,33],E=[1,34],A=[1,35],S=[1,36],_=[1,37],I=[1,38],L=[1,39],k=[1,41],D=[1,42],R=[1,43],O=[1,44],M=[1,45],P=[1,46],B=[1,4,5,13,14,16,18,21,23,29,30,31,33,35,36,37,38,39,41,43,44,46,47,48,49,50,52,53,54,59,60,61,62,70],F=[4,5,16,50,52,53],z=[4,5,13,14,16,18,21,23,29,30,31,33,35,36,37,38,39,41,43,44,46,50,52,53,54,59,60,61,62,70],$=[4,5,13,14,16,18,21,23,29,30,31,33,35,36,37,38,39,41,43,44,46,49,50,52,53,54,59,60,61,62,70],U=[4,5,13,14,16,18,21,23,29,30,31,33,35,36,37,38,39,41,43,44,46,48,50,52,53,54,59,60,61,62,70],Q=[4,5,13,14,16,18,21,23,29,30,31,33,35,36,37,38,39,41,43,44,46,47,50,52,53,54,59,60,61,62,70],te=[68,69,70],Y=[1,122],he={trace:o(function(){},"trace"),yy:{},symbols_:{error:2,start:3,SPACE:4,NEWLINE:5,SD:6,document:7,line:8,statement:9,box_section:10,box_line:11,participant_statement:12,create:13,box:14,restOfLine:15,end:16,signal:17,autonumber:18,NUM:19,off:20,activate:21,actor:22,deactivate:23,note_statement:24,links_statement:25,link_statement:26,properties_statement:27,details_statement:28,title:29,legacy_title:30,acc_title:31,acc_title_value:32,acc_descr:33,acc_descr_value:34,acc_descr_multiline_value:35,loop:36,rect:37,opt:38,alt:39,else_sections:40,par:41,par_sections:42,par_over:43,critical:44,option_sections:45,break:46,option:47,and:48,else:49,participant:50,AS:51,participant_actor:52,destroy:53,note:54,placement:55,text2:56,over:57,actor_pair:58,links:59,link:60,properties:61,details:62,spaceList:63,",":64,left_of:65,right_of:66,signaltype:67,"+":68,"-":69,ACTOR:70,SOLID_OPEN_ARROW:71,DOTTED_OPEN_ARROW:72,SOLID_ARROW:73,BIDIRECTIONAL_SOLID_ARROW:74,DOTTED_ARROW:75,BIDIRECTIONAL_DOTTED_ARROW:76,SOLID_CROSS:77,DOTTED_CROSS:78,SOLID_POINT:79,DOTTED_POINT:80,TXT:81,$accept:0,$end:1},terminals_:{2:"error",4:"SPACE",5:"NEWLINE",6:"SD",13:"create",14:"box",15:"restOfLine",16:"end",18:"autonumber",19:"NUM",20:"off",21:"activate",23:"deactivate",29:"title",30:"legacy_title",31:"acc_title",32:"acc_title_value",33:"acc_descr",34:"acc_descr_value",35:"acc_descr_multiline_value",36:"loop",37:"rect",38:"opt",39:"alt",41:"par",43:"par_over",44:"critical",46:"break",47:"option",48:"and",49:"else",50:"participant",51:"AS",52:"participant_actor",53:"destroy",54:"note",57:"over",59:"links",60:"link",61:"properties",62:"details",64:",",65:"left_of",66:"right_of",68:"+",69:"-",70:"ACTOR",71:"SOLID_OPEN_ARROW",72:"DOTTED_OPEN_ARROW",73:"SOLID_ARROW",74:"BIDIRECTIONAL_SOLID_ARROW",75:"DOTTED_ARROW",76:"BIDIRECTIONAL_DOTTED_ARROW",77:"SOLID_CROSS",78:"DOTTED_CROSS",79:"SOLID_POINT",80:"DOTTED_POINT",81:"TXT"},productions_:[0,[3,2],[3,2],[3,2],[7,0],[7,2],[8,2],[8,1],[8,1],[10,0],[10,2],[11,2],[11,1],[11,1],[9,1],[9,2],[9,4],[9,2],[9,4],[9,3],[9,3],[9,2],[9,3],[9,3],[9,2],[9,2],[9,2],[9,2],[9,2],[9,1],[9,1],[9,2],[9,2],[9,1],[9,4],[9,4],[9,4],[9,4],[9,4],[9,4],[9,4],[9,4],[45,1],[45,4],[42,1],[42,4],[40,1],[40,4],[12,5],[12,3],[12,5],[12,3],[12,3],[24,4],[24,4],[25,3],[26,3],[27,3],[28,3],[63,2],[63,1],[58,3],[58,1],[55,1],[55,1],[17,5],[17,5],[17,4],[22,1],[67,1],[67,1],[67,1],[67,1],[67,1],[67,1],[67,1],[67,1],[67,1],[67,1],[56,1]],performAction:o(function(j,ne,ee,ce,le,J,Se){var se=J.length-1;switch(le){case 3:return ce.apply(J[se]),J[se];break;case 4:case 9:this.$=[];break;case 5:case 10:J[se-1].push(J[se]),this.$=J[se-1];break;case 6:case 7:case 11:case 12:this.$=J[se];break;case 8:case 13:this.$=[];break;case 15:J[se].type="createParticipant",this.$=J[se];break;case 16:J[se-1].unshift({type:"boxStart",boxData:ce.parseBoxData(J[se-2])}),J[se-1].push({type:"boxEnd",boxText:J[se-2]}),this.$=J[se-1];break;case 18:this.$={type:"sequenceIndex",sequenceIndex:Number(J[se-2]),sequenceIndexStep:Number(J[se-1]),sequenceVisible:!0,signalType:ce.LINETYPE.AUTONUMBER};break;case 19:this.$={type:"sequenceIndex",sequenceIndex:Number(J[se-1]),sequenceIndexStep:1,sequenceVisible:!0,signalType:ce.LINETYPE.AUTONUMBER};break;case 20:this.$={type:"sequenceIndex",sequenceVisible:!1,signalType:ce.LINETYPE.AUTONUMBER};break;case 21:this.$={type:"sequenceIndex",sequenceVisible:!0,signalType:ce.LINETYPE.AUTONUMBER};break;case 22:this.$={type:"activeStart",signalType:ce.LINETYPE.ACTIVE_START,actor:J[se-1].actor};break;case 23:this.$={type:"activeEnd",signalType:ce.LINETYPE.ACTIVE_END,actor:J[se-1].actor};break;case 29:ce.setDiagramTitle(J[se].substring(6)),this.$=J[se].substring(6);break;case 30:ce.setDiagramTitle(J[se].substring(7)),this.$=J[se].substring(7);break;case 31:this.$=J[se].trim(),ce.setAccTitle(this.$);break;case 32:case 33:this.$=J[se].trim(),ce.setAccDescription(this.$);break;case 34:J[se-1].unshift({type:"loopStart",loopText:ce.parseMessage(J[se-2]),signalType:ce.LINETYPE.LOOP_START}),J[se-1].push({type:"loopEnd",loopText:J[se-2],signalType:ce.LINETYPE.LOOP_END}),this.$=J[se-1];break;case 35:J[se-1].unshift({type:"rectStart",color:ce.parseMessage(J[se-2]),signalType:ce.LINETYPE.RECT_START}),J[se-1].push({type:"rectEnd",color:ce.parseMessage(J[se-2]),signalType:ce.LINETYPE.RECT_END}),this.$=J[se-1];break;case 36:J[se-1].unshift({type:"optStart",optText:ce.parseMessage(J[se-2]),signalType:ce.LINETYPE.OPT_START}),J[se-1].push({type:"optEnd",optText:ce.parseMessage(J[se-2]),signalType:ce.LINETYPE.OPT_END}),this.$=J[se-1];break;case 37:J[se-1].unshift({type:"altStart",altText:ce.parseMessage(J[se-2]),signalType:ce.LINETYPE.ALT_START}),J[se-1].push({type:"altEnd",signalType:ce.LINETYPE.ALT_END}),this.$=J[se-1];break;case 38:J[se-1].unshift({type:"parStart",parText:ce.parseMessage(J[se-2]),signalType:ce.LINETYPE.PAR_START}),J[se-1].push({type:"parEnd",signalType:ce.LINETYPE.PAR_END}),this.$=J[se-1];break;case 39:J[se-1].unshift({type:"parStart",parText:ce.parseMessage(J[se-2]),signalType:ce.LINETYPE.PAR_OVER_START}),J[se-1].push({type:"parEnd",signalType:ce.LINETYPE.PAR_END}),this.$=J[se-1];break;case 40:J[se-1].unshift({type:"criticalStart",criticalText:ce.parseMessage(J[se-2]),signalType:ce.LINETYPE.CRITICAL_START}),J[se-1].push({type:"criticalEnd",signalType:ce.LINETYPE.CRITICAL_END}),this.$=J[se-1];break;case 41:J[se-1].unshift({type:"breakStart",breakText:ce.parseMessage(J[se-2]),signalType:ce.LINETYPE.BREAK_START}),J[se-1].push({type:"breakEnd",optText:ce.parseMessage(J[se-2]),signalType:ce.LINETYPE.BREAK_END}),this.$=J[se-1];break;case 43:this.$=J[se-3].concat([{type:"option",optionText:ce.parseMessage(J[se-1]),signalType:ce.LINETYPE.CRITICAL_OPTION},J[se]]);break;case 45:this.$=J[se-3].concat([{type:"and",parText:ce.parseMessage(J[se-1]),signalType:ce.LINETYPE.PAR_AND},J[se]]);break;case 47:this.$=J[se-3].concat([{type:"else",altText:ce.parseMessage(J[se-1]),signalType:ce.LINETYPE.ALT_ELSE},J[se]]);break;case 48:J[se-3].draw="participant",J[se-3].type="addParticipant",J[se-3].description=ce.parseMessage(J[se-1]),this.$=J[se-3];break;case 49:J[se-1].draw="participant",J[se-1].type="addParticipant",this.$=J[se-1];break;case 50:J[se-3].draw="actor",J[se-3].type="addParticipant",J[se-3].description=ce.parseMessage(J[se-1]),this.$=J[se-3];break;case 51:J[se-1].draw="actor",J[se-1].type="addParticipant",this.$=J[se-1];break;case 52:J[se-1].type="destroyParticipant",this.$=J[se-1];break;case 53:this.$=[J[se-1],{type:"addNote",placement:J[se-2],actor:J[se-1].actor,text:J[se]}];break;case 54:J[se-2]=[].concat(J[se-1],J[se-1]).slice(0,2),J[se-2][0]=J[se-2][0].actor,J[se-2][1]=J[se-2][1].actor,this.$=[J[se-1],{type:"addNote",placement:ce.PLACEMENT.OVER,actor:J[se-2].slice(0,2),text:J[se]}];break;case 55:this.$=[J[se-1],{type:"addLinks",actor:J[se-1].actor,text:J[se]}];break;case 56:this.$=[J[se-1],{type:"addALink",actor:J[se-1].actor,text:J[se]}];break;case 57:this.$=[J[se-1],{type:"addProperties",actor:J[se-1].actor,text:J[se]}];break;case 58:this.$=[J[se-1],{type:"addDetails",actor:J[se-1].actor,text:J[se]}];break;case 61:this.$=[J[se-2],J[se]];break;case 62:this.$=J[se];break;case 63:this.$=ce.PLACEMENT.LEFTOF;break;case 64:this.$=ce.PLACEMENT.RIGHTOF;break;case 65:this.$=[J[se-4],J[se-1],{type:"addMessage",from:J[se-4].actor,to:J[se-1].actor,signalType:J[se-3],msg:J[se],activate:!0},{type:"activeStart",signalType:ce.LINETYPE.ACTIVE_START,actor:J[se-1].actor}];break;case 66:this.$=[J[se-4],J[se-1],{type:"addMessage",from:J[se-4].actor,to:J[se-1].actor,signalType:J[se-3],msg:J[se]},{type:"activeEnd",signalType:ce.LINETYPE.ACTIVE_END,actor:J[se-4].actor}];break;case 67:this.$=[J[se-3],J[se-1],{type:"addMessage",from:J[se-3].actor,to:J[se-1].actor,signalType:J[se-2],msg:J[se]}];break;case 68:this.$={type:"addParticipant",actor:J[se]};break;case 69:this.$=ce.LINETYPE.SOLID_OPEN;break;case 70:this.$=ce.LINETYPE.DOTTED_OPEN;break;case 71:this.$=ce.LINETYPE.SOLID;break;case 72:this.$=ce.LINETYPE.BIDIRECTIONAL_SOLID;break;case 73:this.$=ce.LINETYPE.DOTTED;break;case 74:this.$=ce.LINETYPE.BIDIRECTIONAL_DOTTED;break;case 75:this.$=ce.LINETYPE.SOLID_CROSS;break;case 76:this.$=ce.LINETYPE.DOTTED_CROSS;break;case 77:this.$=ce.LINETYPE.SOLID_POINT;break;case 78:this.$=ce.LINETYPE.DOTTED_POINT;break;case 79:this.$=ce.parseMessage(J[se].trim().substring(1));break}},"anonymous"),table:[{3:1,4:e,5:r,6:n},{1:[3]},{3:5,4:e,5:r,6:n},{3:6,4:e,5:r,6:n},t([1,4,5,13,14,18,21,23,29,30,31,33,35,36,37,38,39,41,43,44,46,50,52,53,54,59,60,61,62,70],i,{7:7}),{1:[2,1]},{1:[2,2]},{1:[2,3],4:a,5:s,8:8,9:10,12:12,13:l,14:u,17:15,18:h,21:f,22:40,23:d,24:19,25:20,26:21,27:22,28:23,29:p,30:m,31:g,33:y,35:v,36:x,37:b,38:w,39:C,41:T,43:E,44:A,46:S,50:_,52:I,53:L,54:k,59:D,60:R,61:O,62:M,70:P},t(B,[2,5]),{9:47,12:12,13:l,14:u,17:15,18:h,21:f,22:40,23:d,24:19,25:20,26:21,27:22,28:23,29:p,30:m,31:g,33:y,35:v,36:x,37:b,38:w,39:C,41:T,43:E,44:A,46:S,50:_,52:I,53:L,54:k,59:D,60:R,61:O,62:M,70:P},t(B,[2,7]),t(B,[2,8]),t(B,[2,14]),{12:48,50:_,52:I,53:L},{15:[1,49]},{5:[1,50]},{5:[1,53],19:[1,51],20:[1,52]},{22:54,70:P},{22:55,70:P},{5:[1,56]},{5:[1,57]},{5:[1,58]},{5:[1,59]},{5:[1,60]},t(B,[2,29]),t(B,[2,30]),{32:[1,61]},{34:[1,62]},t(B,[2,33]),{15:[1,63]},{15:[1,64]},{15:[1,65]},{15:[1,66]},{15:[1,67]},{15:[1,68]},{15:[1,69]},{15:[1,70]},{22:71,70:P},{22:72,70:P},{22:73,70:P},{67:74,71:[1,75],72:[1,76],73:[1,77],74:[1,78],75:[1,79],76:[1,80],77:[1,81],78:[1,82],79:[1,83],80:[1,84]},{55:85,57:[1,86],65:[1,87],66:[1,88]},{22:89,70:P},{22:90,70:P},{22:91,70:P},{22:92,70:P},t([5,51,64,71,72,73,74,75,76,77,78,79,80,81],[2,68]),t(B,[2,6]),t(B,[2,15]),t(F,[2,9],{10:93}),t(B,[2,17]),{5:[1,95],19:[1,94]},{5:[1,96]},t(B,[2,21]),{5:[1,97]},{5:[1,98]},t(B,[2,24]),t(B,[2,25]),t(B,[2,26]),t(B,[2,27]),t(B,[2,28]),t(B,[2,31]),t(B,[2,32]),t(z,i,{7:99}),t(z,i,{7:100}),t(z,i,{7:101}),t($,i,{40:102,7:103}),t(U,i,{42:104,7:105}),t(U,i,{7:105,42:106}),t(Q,i,{45:107,7:108}),t(z,i,{7:109}),{5:[1,111],51:[1,110]},{5:[1,113],51:[1,112]},{5:[1,114]},{22:117,68:[1,115],69:[1,116],70:P},t(te,[2,69]),t(te,[2,70]),t(te,[2,71]),t(te,[2,72]),t(te,[2,73]),t(te,[2,74]),t(te,[2,75]),t(te,[2,76]),t(te,[2,77]),t(te,[2,78]),{22:118,70:P},{22:120,58:119,70:P},{70:[2,63]},{70:[2,64]},{56:121,81:Y},{56:123,81:Y},{56:124,81:Y},{56:125,81:Y},{4:[1,128],5:[1,130],11:127,12:129,16:[1,126],50:_,52:I,53:L},{5:[1,131]},t(B,[2,19]),t(B,[2,20]),t(B,[2,22]),t(B,[2,23]),{4:a,5:s,8:8,9:10,12:12,13:l,14:u,16:[1,132],17:15,18:h,21:f,22:40,23:d,24:19,25:20,26:21,27:22,28:23,29:p,30:m,31:g,33:y,35:v,36:x,37:b,38:w,39:C,41:T,43:E,44:A,46:S,50:_,52:I,53:L,54:k,59:D,60:R,61:O,62:M,70:P},{4:a,5:s,8:8,9:10,12:12,13:l,14:u,16:[1,133],17:15,18:h,21:f,22:40,23:d,24:19,25:20,26:21,27:22,28:23,29:p,30:m,31:g,33:y,35:v,36:x,37:b,38:w,39:C,41:T,43:E,44:A,46:S,50:_,52:I,53:L,54:k,59:D,60:R,61:O,62:M,70:P},{4:a,5:s,8:8,9:10,12:12,13:l,14:u,16:[1,134],17:15,18:h,21:f,22:40,23:d,24:19,25:20,26:21,27:22,28:23,29:p,30:m,31:g,33:y,35:v,36:x,37:b,38:w,39:C,41:T,43:E,44:A,46:S,50:_,52:I,53:L,54:k,59:D,60:R,61:O,62:M,70:P},{16:[1,135]},{4:a,5:s,8:8,9:10,12:12,13:l,14:u,16:[2,46],17:15,18:h,21:f,22:40,23:d,24:19,25:20,26:21,27:22,28:23,29:p,30:m,31:g,33:y,35:v,36:x,37:b,38:w,39:C,41:T,43:E,44:A,46:S,49:[1,136],50:_,52:I,53:L,54:k,59:D,60:R,61:O,62:M,70:P},{16:[1,137]},{4:a,5:s,8:8,9:10,12:12,13:l,14:u,16:[2,44],17:15,18:h,21:f,22:40,23:d,24:19,25:20,26:21,27:22,28:23,29:p,30:m,31:g,33:y,35:v,36:x,37:b,38:w,39:C,41:T,43:E,44:A,46:S,48:[1,138],50:_,52:I,53:L,54:k,59:D,60:R,61:O,62:M,70:P},{16:[1,139]},{16:[1,140]},{4:a,5:s,8:8,9:10,12:12,13:l,14:u,16:[2,42],17:15,18:h,21:f,22:40,23:d,24:19,25:20,26:21,27:22,28:23,29:p,30:m,31:g,33:y,35:v,36:x,37:b,38:w,39:C,41:T,43:E,44:A,46:S,47:[1,141],50:_,52:I,53:L,54:k,59:D,60:R,61:O,62:M,70:P},{4:a,5:s,8:8,9:10,12:12,13:l,14:u,16:[1,142],17:15,18:h,21:f,22:40,23:d,24:19,25:20,26:21,27:22,28:23,29:p,30:m,31:g,33:y,35:v,36:x,37:b,38:w,39:C,41:T,43:E,44:A,46:S,50:_,52:I,53:L,54:k,59:D,60:R,61:O,62:M,70:P},{15:[1,143]},t(B,[2,49]),{15:[1,144]},t(B,[2,51]),t(B,[2,52]),{22:145,70:P},{22:146,70:P},{56:147,81:Y},{56:148,81:Y},{56:149,81:Y},{64:[1,150],81:[2,62]},{5:[2,55]},{5:[2,79]},{5:[2,56]},{5:[2,57]},{5:[2,58]},t(B,[2,16]),t(F,[2,10]),{12:151,50:_,52:I,53:L},t(F,[2,12]),t(F,[2,13]),t(B,[2,18]),t(B,[2,34]),t(B,[2,35]),t(B,[2,36]),t(B,[2,37]),{15:[1,152]},t(B,[2,38]),{15:[1,153]},t(B,[2,39]),t(B,[2,40]),{15:[1,154]},t(B,[2,41]),{5:[1,155]},{5:[1,156]},{56:157,81:Y},{56:158,81:Y},{5:[2,67]},{5:[2,53]},{5:[2,54]},{22:159,70:P},t(F,[2,11]),t($,i,{7:103,40:160}),t(U,i,{7:105,42:161}),t(Q,i,{7:108,45:162}),t(B,[2,48]),t(B,[2,50]),{5:[2,65]},{5:[2,66]},{81:[2,61]},{16:[2,47]},{16:[2,45]},{16:[2,43]}],defaultActions:{5:[2,1],6:[2,2],87:[2,63],88:[2,64],121:[2,55],122:[2,79],123:[2,56],124:[2,57],125:[2,58],147:[2,67],148:[2,53],149:[2,54],157:[2,65],158:[2,66],159:[2,61],160:[2,47],161:[2,45],162:[2,43]},parseError:o(function(j,ne){if(ne.recoverable)this.trace(j);else{var ee=new Error(j);throw ee.hash=ne,ee}},"parseError"),parse:o(function(j){var ne=this,ee=[0],ce=[],le=[null],J=[],Se=this.table,se="",ae=0,Oe=0,ye=0,Be=2,He=1,ze=J.slice.call(arguments,1),Le=Object.create(this.lexer),Ie={yy:{}};for(var xe in this.yy)Object.prototype.hasOwnProperty.call(this.yy,xe)&&(Ie.yy[xe]=this.yy[xe]);Le.setInput(j,Ie.yy),Ie.yy.lexer=Le,Ie.yy.parser=this,typeof Le.yylloc>"u"&&(Le.yylloc={});var q=Le.yylloc;J.push(q);var de=Le.options&&Le.options.ranges;typeof Ie.yy.parseError=="function"?this.parseError=Ie.yy.parseError:this.parseError=Object.getPrototypeOf(this).parseError;function ie(Lt){ee.length=ee.length-2*Lt,le.length=le.length-Lt,J.length=J.length-Lt}o(ie,"popStack");function oe(){var Lt;return Lt=ce.pop()||Le.lex()||He,typeof Lt!="number"&&(Lt instanceof Array&&(ce=Lt,Lt=ce.pop()),Lt=ne.symbols_[Lt]||Lt),Lt}o(oe,"lex");for(var V,we,W,pe,ve,Pe,_e={},be,Ve,De,qe;;){if(W=ee[ee.length-1],this.defaultActions[W]?pe=this.defaultActions[W]:((V===null||typeof V>"u")&&(V=oe()),pe=Se[W]&&Se[W][V]),typeof pe>"u"||!pe.length||!pe[0]){var at="";qe=[];for(be in Se[W])this.terminals_[be]&&be>Be&&qe.push("'"+this.terminals_[be]+"'");Le.showPosition?at="Parse error on line "+(ae+1)+`: +`+Le.showPosition()+` +Expecting `+qe.join(", ")+", got '"+(this.terminals_[V]||V)+"'":at="Parse error on line "+(ae+1)+": Unexpected "+(V==He?"end of input":"'"+(this.terminals_[V]||V)+"'"),this.parseError(at,{text:Le.match,token:this.terminals_[V]||V,line:Le.yylineno,loc:q,expected:qe})}if(pe[0]instanceof Array&&pe.length>1)throw new Error("Parse Error: multiple actions possible at state: "+W+", token: "+V);switch(pe[0]){case 1:ee.push(V),le.push(Le.yytext),J.push(Le.yylloc),ee.push(pe[1]),V=null,we?(V=we,we=null):(Oe=Le.yyleng,se=Le.yytext,ae=Le.yylineno,q=Le.yylloc,ye>0&&ye--);break;case 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this.yy=ne||this.yy||{},this._input=j,this._more=this._backtrack=this.done=!1,this.yylineno=this.yyleng=0,this.yytext=this.matched=this.match="",this.conditionStack=["INITIAL"],this.yylloc={first_line:1,first_column:0,last_line:1,last_column:0},this.options.ranges&&(this.yylloc.range=[0,0]),this.offset=0,this},"setInput"),input:o(function(){var j=this._input[0];this.yytext+=j,this.yyleng++,this.offset++,this.match+=j,this.matched+=j;var ne=j.match(/(?:\r\n?|\n).*/g);return ne?(this.yylineno++,this.yylloc.last_line++):this.yylloc.last_column++,this.options.ranges&&this.yylloc.range[1]++,this._input=this._input.slice(1),j},"input"),unput:o(function(j){var ne=j.length,ee=j.split(/(?:\r\n?|\n)/g);this._input=j+this._input,this.yytext=this.yytext.substr(0,this.yytext.length-ne),this.offset-=ne;var ce=this.match.split(/(?:\r\n?|\n)/g);this.match=this.match.substr(0,this.match.length-1),this.matched=this.matched.substr(0,this.matched.length-1),ee.length-1&&(this.yylineno-=ee.length-1);var le=this.yylloc.range;return this.yylloc={first_line:this.yylloc.first_line,last_line:this.yylineno+1,first_column:this.yylloc.first_column,last_column:ee?(ee.length===ce.length?this.yylloc.first_column:0)+ce[ce.length-ee.length].length-ee[0].length:this.yylloc.first_column-ne},this.options.ranges&&(this.yylloc.range=[le[0],le[0]+this.yyleng-ne]),this.yyleng=this.yytext.length,this},"unput"),more:o(function(){return this._more=!0,this},"more"),reject:o(function(){if(this.options.backtrack_lexer)this._backtrack=!0;else return this.parseError("Lexical error on line "+(this.yylineno+1)+`. You can only invoke reject() in the lexer when the lexer is of the backtracking persuasion (options.backtrack_lexer = true). +`+this.showPosition(),{text:"",token:null,line:this.yylineno});return this},"reject"),less:o(function(j){this.unput(this.match.slice(j))},"less"),pastInput:o(function(){var j=this.matched.substr(0,this.matched.length-this.match.length);return(j.length>20?"...":"")+j.substr(-20).replace(/\n/g,"")},"pastInput"),upcomingInput:o(function(){var j=this.match;return j.length<20&&(j+=this._input.substr(0,20-j.length)),(j.substr(0,20)+(j.length>20?"...":"")).replace(/\n/g,"")},"upcomingInput"),showPosition:o(function(){var j=this.pastInput(),ne=new Array(j.length+1).join("-");return j+this.upcomingInput()+` +`+ne+"^"},"showPosition"),test_match:o(function(j,ne){var ee,ce,le;if(this.options.backtrack_lexer&&(le={yylineno:this.yylineno,yylloc:{first_line:this.yylloc.first_line,last_line:this.last_line,first_column:this.yylloc.first_column,last_column:this.yylloc.last_column},yytext:this.yytext,match:this.match,matches:this.matches,matched:this.matched,yyleng:this.yyleng,offset:this.offset,_more:this._more,_input:this._input,yy:this.yy,conditionStack:this.conditionStack.slice(0),done:this.done},this.options.ranges&&(le.yylloc.range=this.yylloc.range.slice(0))),ce=j[0].match(/(?:\r\n?|\n).*/g),ce&&(this.yylineno+=ce.length),this.yylloc={first_line:this.yylloc.last_line,last_line:this.yylineno+1,first_column:this.yylloc.last_column,last_column:ce?ce[ce.length-1].length-ce[ce.length-1].match(/\r?\n?/)[0].length:this.yylloc.last_column+j[0].length},this.yytext+=j[0],this.match+=j[0],this.matches=j,this.yyleng=this.yytext.length,this.options.ranges&&(this.yylloc.range=[this.offset,this.offset+=this.yyleng]),this._more=!1,this._backtrack=!1,this._input=this._input.slice(j[0].length),this.matched+=j[0],ee=this.performAction.call(this,this.yy,this,ne,this.conditionStack[this.conditionStack.length-1]),this.done&&this._input&&(this.done=!1),ee)return ee;if(this._backtrack){for(var J in le)this[J]=le[J];return!1}return!1},"test_match"),next:o(function(){if(this.done)return this.EOF;this._input||(this.done=!0);var j,ne,ee,ce;this._more||(this.yytext="",this.match="");for(var le=this._currentRules(),J=0;Jne[0].length)){if(ne=ee,ce=J,this.options.backtrack_lexer){if(j=this.test_match(ee,le[J]),j!==!1)return j;if(this._backtrack){ne=!1;continue}else return!1}else if(!this.options.flex)break}return ne?(j=this.test_match(ne,le[ce]),j!==!1?j:!1):this._input===""?this.EOF:this.parseError("Lexical error on line "+(this.yylineno+1)+`. Unrecognized text. +`+this.showPosition(),{text:"",token:null,line:this.yylineno})},"next"),lex:o(function(){var ne=this.next();return ne||this.lex()},"lex"),begin:o(function(ne){this.conditionStack.push(ne)},"begin"),popState:o(function(){var ne=this.conditionStack.length-1;return ne>0?this.conditionStack.pop():this.conditionStack[0]},"popState"),_currentRules:o(function(){return this.conditionStack.length&&this.conditionStack[this.conditionStack.length-1]?this.conditions[this.conditionStack[this.conditionStack.length-1]].rules:this.conditions.INITIAL.rules},"_currentRules"),topState:o(function(ne){return ne=this.conditionStack.length-1-Math.abs(ne||0),ne>=0?this.conditionStack[ne]:"INITIAL"},"topState"),pushState:o(function(ne){this.begin(ne)},"pushState"),stateStackSize:o(function(){return this.conditionStack.length},"stateStackSize"),options:{"case-insensitive":!0},performAction:o(function(ne,ee,ce,le){var J=le;switch(ce){case 0:return 5;case 1:break;case 2:break;case 3:break;case 4:break;case 5:break;case 6:return 19;case 7:return this.begin("LINE"),14;break;case 8:return this.begin("ID"),50;break;case 9:return this.begin("ID"),52;break;case 10:return 13;case 11:return this.begin("ID"),53;break;case 12:return ee.yytext=ee.yytext.trim(),this.begin("ALIAS"),70;break;case 13:return this.popState(),this.popState(),this.begin("LINE"),51;break;case 14:return this.popState(),this.popState(),5;break;case 15:return this.begin("LINE"),36;break;case 16:return this.begin("LINE"),37;break;case 17:return this.begin("LINE"),38;break;case 18:return this.begin("LINE"),39;break;case 19:return this.begin("LINE"),49;break;case 20:return this.begin("LINE"),41;break;case 21:return this.begin("LINE"),43;break;case 22:return this.begin("LINE"),48;break;case 23:return this.begin("LINE"),44;break;case 24:return this.begin("LINE"),47;break;case 25:return this.begin("LINE"),46;break;case 26:return this.popState(),15;break;case 27:return 16;case 28:return 65;case 29:return 66;case 30:return 59;case 31:return 60;case 32:return 61;case 33:return 62;case 34:return 57;case 35:return 54;case 36:return this.begin("ID"),21;break;case 37:return this.begin("ID"),23;break;case 38:return 29;case 39:return 30;case 40:return this.begin("acc_title"),31;break;case 41:return this.popState(),"acc_title_value";break;case 42:return this.begin("acc_descr"),33;break;case 43:return this.popState(),"acc_descr_value";break;case 44:this.begin("acc_descr_multiline");break;case 45:this.popState();break;case 46:return"acc_descr_multiline_value";case 47:return 6;case 48:return 18;case 49:return 20;case 50:return 64;case 51:return 5;case 52:return ee.yytext=ee.yytext.trim(),70;break;case 53:return 73;case 54:return 74;case 55:return 75;case 56:return 76;case 57:return 71;case 58:return 72;case 59:return 77;case 60:return 78;case 61:return 79;case 62:return 80;case 63:return 81;case 64:return 81;case 65:return 68;case 66:return 69;case 67:return 5;case 68:return"INVALID"}},"anonymous"),rules:[/^(?:[\n]+)/i,/^(?:\s+)/i,/^(?:((?!\n)\s)+)/i,/^(?:#[^\n]*)/i,/^(?:%(?!\{)[^\n]*)/i,/^(?:[^\}]%%[^\n]*)/i,/^(?:[0-9]+(?=[ \n]+))/i,/^(?:box\b)/i,/^(?:participant\b)/i,/^(?:actor\b)/i,/^(?:create\b)/i,/^(?:destroy\b)/i,/^(?:[^\<->\->:\n,;]+?([\-]*[^\<->\->:\n,;]+?)*?(?=((?!\n)\s)+as(?!\n)\s|[#\n;]|$))/i,/^(?:as\b)/i,/^(?:(?:))/i,/^(?:loop\b)/i,/^(?:rect\b)/i,/^(?:opt\b)/i,/^(?:alt\b)/i,/^(?:else\b)/i,/^(?:par\b)/i,/^(?:par_over\b)/i,/^(?:and\b)/i,/^(?:critical\b)/i,/^(?:option\b)/i,/^(?:break\b)/i,/^(?:(?:[:]?(?:no)?wrap)?[^#\n;]*)/i,/^(?:end\b)/i,/^(?:left of\b)/i,/^(?:right of\b)/i,/^(?:links\b)/i,/^(?:link\b)/i,/^(?:properties\b)/i,/^(?:details\b)/i,/^(?:over\b)/i,/^(?:note\b)/i,/^(?:activate\b)/i,/^(?:deactivate\b)/i,/^(?:title\s[^#\n;]+)/i,/^(?:title:\s[^#\n;]+)/i,/^(?:accTitle\s*:\s*)/i,/^(?:(?!\n||)*[^\n]*)/i,/^(?:accDescr\s*:\s*)/i,/^(?:(?!\n||)*[^\n]*)/i,/^(?:accDescr\s*\{\s*)/i,/^(?:[\}])/i,/^(?:[^\}]*)/i,/^(?:sequenceDiagram\b)/i,/^(?:autonumber\b)/i,/^(?:off\b)/i,/^(?:,)/i,/^(?:;)/i,/^(?:[^\+\<->\->:\n,;]+((?!(-x|--x|-\)|--\)))[\-]*[^\+\<->\->:\n,;]+)*)/i,/^(?:->>)/i,/^(?:<<->>)/i,/^(?:-->>)/i,/^(?:<<-->>)/i,/^(?:->)/i,/^(?:-->)/i,/^(?:-[x])/i,/^(?:--[x])/i,/^(?:-[\)])/i,/^(?:--[\)])/i,/^(?::(?:(?:no)?wrap)?[^#\n;]*)/i,/^(?::)/i,/^(?:\+)/i,/^(?:-)/i,/^(?:$)/i,/^(?:.)/i],conditions:{acc_descr_multiline:{rules:[45,46],inclusive:!1},acc_descr:{rules:[43],inclusive:!1},acc_title:{rules:[41],inclusive:!1},ID:{rules:[2,3,12],inclusive:!1},ALIAS:{rules:[2,3,13,14],inclusive:!1},LINE:{rules:[2,3,26],inclusive:!1},INITIAL:{rules:[0,1,3,4,5,6,7,8,9,10,11,15,16,17,18,19,20,21,22,23,24,25,27,28,29,30,31,32,33,34,35,36,37,38,39,40,42,44,47,48,49,50,51,52,53,54,55,56,57,58,59,60,61,62,63,64,65,66,67,68],inclusive:!0}}};return K}();he.lexer=Z;function ue(){this.yy={}}return o(ue,"Parser"),ue.prototype=he,he.Parser=ue,new ue}();RO.parser=RO;ffe=RO});var eVe,tVe,rVe,IS,pfe=N(()=>{"use strict";zt();vt();fS();dr();mi();eVe={SOLID:0,DOTTED:1,NOTE:2,SOLID_CROSS:3,DOTTED_CROSS:4,SOLID_OPEN:5,DOTTED_OPEN:6,LOOP_START:10,LOOP_END:11,ALT_START:12,ALT_ELSE:13,ALT_END:14,OPT_START:15,OPT_END:16,ACTIVE_START:17,ACTIVE_END:18,PAR_START:19,PAR_AND:20,PAR_END:21,RECT_START:22,RECT_END:23,SOLID_POINT:24,DOTTED_POINT:25,AUTONUMBER:26,CRITICAL_START:27,CRITICAL_OPTION:28,CRITICAL_END:29,BREAK_START:30,BREAK_END:31,PAR_OVER_START:32,BIDIRECTIONAL_SOLID:33,BIDIRECTIONAL_DOTTED:34},tVe={FILLED:0,OPEN:1},rVe={LEFTOF:0,RIGHTOF:1,OVER:2},IS=class{constructor(){this.state=new vf(()=>({prevActor:void 0,actors:new Map,createdActors:new Map,destroyedActors:new Map,boxes:[],messages:[],notes:[],sequenceNumbersEnabled:!1,wrapEnabled:void 0,currentBox:void 0,lastCreated:void 0,lastDestroyed:void 0}));this.setAccTitle=Lr;this.setAccDescription=Nr;this.setDiagramTitle=$r;this.getAccTitle=Rr;this.getAccDescription=Mr;this.getDiagramTitle=Ir;this.apply=this.apply.bind(this),this.parseBoxData=this.parseBoxData.bind(this),this.parseMessage=this.parseMessage.bind(this),this.clear(),this.setWrap(me().wrap),this.LINETYPE=eVe,this.ARROWTYPE=tVe,this.PLACEMENT=rVe}static{o(this,"SequenceDB")}addBox(e){this.state.records.boxes.push({name:e.text,wrap:e.wrap??this.autoWrap(),fill:e.color,actorKeys:[]}),this.state.records.currentBox=this.state.records.boxes.slice(-1)[0]}addActor(e,r,n,i){let a=this.state.records.currentBox,s=this.state.records.actors.get(e);if(s){if(this.state.records.currentBox&&s.box&&this.state.records.currentBox!==s.box)throw new Error(`A same participant should only be defined in one Box: ${s.name} can't be in '${s.box.name}' and in '${this.state.records.currentBox.name}' at the same time.`);if(a=s.box?s.box:this.state.records.currentBox,s.box=a,s&&r===s.name&&n==null)return}if(n?.text==null&&(n={text:r,type:i}),(i==null||n.text==null)&&(n={text:r,type:i}),this.state.records.actors.set(e,{box:a,name:r,description:n.text,wrap:n.wrap??this.autoWrap(),prevActor:this.state.records.prevActor,links:{},properties:{},actorCnt:null,rectData:null,type:i??"participant"}),this.state.records.prevActor){let l=this.state.records.actors.get(this.state.records.prevActor);l&&(l.nextActor=e)}this.state.records.currentBox&&this.state.records.currentBox.actorKeys.push(e),this.state.records.prevActor=e}activationCount(e){let r,n=0;if(!e)return 0;for(r=0;r>-",token:"->>-",line:"1",loc:{first_line:1,last_line:1,first_column:1,last_column:1},expected:["'ACTIVE_PARTICIPANT'"]},l}return this.state.records.messages.push({id:this.state.records.messages.length.toString(),from:e,to:r,message:n?.text??"",wrap:n?.wrap??this.autoWrap(),type:i,activate:a}),!0}hasAtLeastOneBox(){return this.state.records.boxes.length>0}hasAtLeastOneBoxWithTitle(){return this.state.records.boxes.some(e=>e.name)}getMessages(){return this.state.records.messages}getBoxes(){return this.state.records.boxes}getActors(){return this.state.records.actors}getCreatedActors(){return this.state.records.createdActors}getDestroyedActors(){return this.state.records.destroyedActors}getActor(e){return this.state.records.actors.get(e)}getActorKeys(){return[...this.state.records.actors.keys()]}enableSequenceNumbers(){this.state.records.sequenceNumbersEnabled=!0}disableSequenceNumbers(){this.state.records.sequenceNumbersEnabled=!1}showSequenceNumbers(){return this.state.records.sequenceNumbersEnabled}setWrap(e){this.state.records.wrapEnabled=e}extractWrap(e){if(e===void 0)return{};e=e.trim();let r=/^:?wrap:/.exec(e)!==null?!0:/^:?nowrap:/.exec(e)!==null?!1:void 0;return{cleanedText:(r===void 0?e:e.replace(/^:?(?:no)?wrap:/,"")).trim(),wrap:r}}autoWrap(){return this.state.records.wrapEnabled!==void 0?this.state.records.wrapEnabled:me().sequence?.wrap??!1}clear(){this.state.reset(),Ar()}parseMessage(e){let r=e.trim(),{wrap:n,cleanedText:i}=this.extractWrap(r),a={text:i,wrap:n};return X.debug(`parseMessage: ${JSON.stringify(a)}`),a}parseBoxData(e){let r=/^((?:rgba?|hsla?)\s*\(.*\)|\w*)(.*)$/.exec(e),n=r?.[1]?r[1].trim():"transparent",i=r?.[2]?r[2].trim():void 0;if(window?.CSS)window.CSS.supports("color",n)||(n="transparent",i=e.trim());else{let l=new Option().style;l.color=n,l.color!==n&&(n="transparent",i=e.trim())}let{wrap:a,cleanedText:s}=this.extractWrap(i);return{text:s?Tr(s,me()):void 0,color:n,wrap:a}}addNote(e,r,n){let i={actor:e,placement:r,message:n.text,wrap:n.wrap??this.autoWrap()},a=[].concat(e,e);this.state.records.notes.push(i),this.state.records.messages.push({id:this.state.records.messages.length.toString(),from:a[0],to:a[1],message:n.text,wrap:n.wrap??this.autoWrap(),type:this.LINETYPE.NOTE,placement:r})}addLinks(e,r){let n=this.getActor(e);try{let i=Tr(r.text,me());i=i.replace(/=/g,"="),i=i.replace(/&/g,"&");let a=JSON.parse(i);this.insertLinks(n,a)}catch(i){X.error("error while parsing actor link text",i)}}addALink(e,r){let n=this.getActor(e);try{let i={},a=Tr(r.text,me()),s=a.indexOf("@");a=a.replace(/=/g,"="),a=a.replace(/&/g,"&");let l=a.slice(0,s-1).trim(),u=a.slice(s+1).trim();i[l]=u,this.insertLinks(n,i)}catch(i){X.error("error while parsing actor link text",i)}}insertLinks(e,r){if(e.links==null)e.links=r;else for(let n in r)e.links[n]=r[n]}addProperties(e,r){let n=this.getActor(e);try{let i=Tr(r.text,me()),a=JSON.parse(i);this.insertProperties(n,a)}catch(i){X.error("error while parsing actor properties text",i)}}insertProperties(e,r){if(e.properties==null)e.properties=r;else for(let n in r)e.properties[n]=r[n]}boxEnd(){this.state.records.currentBox=void 0}addDetails(e,r){let n=this.getActor(e),i=document.getElementById(r.text);try{let a=i.innerHTML,s=JSON.parse(a);s.properties&&this.insertProperties(n,s.properties),s.links&&this.insertLinks(n,s.links)}catch(a){X.error("error while parsing actor details text",a)}}getActorProperty(e,r){if(e?.properties!==void 0)return e.properties[r]}apply(e){if(Array.isArray(e))e.forEach(r=>{this.apply(r)});else switch(e.type){case"sequenceIndex":this.state.records.messages.push({id:this.state.records.messages.length.toString(),from:void 0,to:void 0,message:{start:e.sequenceIndex,step:e.sequenceIndexStep,visible:e.sequenceVisible},wrap:!1,type:e.signalType});break;case"addParticipant":this.addActor(e.actor,e.actor,e.description,e.draw);break;case"createParticipant":if(this.state.records.actors.has(e.actor))throw new Error("It is not possible to have actors with the same id, even if one is destroyed before the next is created. Use 'AS' aliases to simulate the behavior");this.state.records.lastCreated=e.actor,this.addActor(e.actor,e.actor,e.description,e.draw),this.state.records.createdActors.set(e.actor,this.state.records.messages.length);break;case"destroyParticipant":this.state.records.lastDestroyed=e.actor,this.state.records.destroyedActors.set(e.actor,this.state.records.messages.length);break;case"activeStart":this.addSignal(e.actor,void 0,void 0,e.signalType);break;case"activeEnd":this.addSignal(e.actor,void 0,void 0,e.signalType);break;case"addNote":this.addNote(e.actor,e.placement,e.text);break;case"addLinks":this.addLinks(e.actor,e.text);break;case"addALink":this.addALink(e.actor,e.text);break;case"addProperties":this.addProperties(e.actor,e.text);break;case"addDetails":this.addDetails(e.actor,e.text);break;case"addMessage":if(this.state.records.lastCreated){if(e.to!==this.state.records.lastCreated)throw new Error("The created participant "+this.state.records.lastCreated.name+" does not have an associated creating message after its declaration. Please check the sequence diagram.");this.state.records.lastCreated=void 0}else if(this.state.records.lastDestroyed){if(e.to!==this.state.records.lastDestroyed&&e.from!==this.state.records.lastDestroyed)throw new Error("The destroyed participant "+this.state.records.lastDestroyed.name+" does not have an associated destroying message after its declaration. Please check the sequence diagram.");this.state.records.lastDestroyed=void 0}this.addSignal(e.from,e.to,e.msg,e.signalType,e.activate);break;case"boxStart":this.addBox(e.boxData);break;case"boxEnd":this.boxEnd();break;case"loopStart":this.addSignal(void 0,void 0,e.loopText,e.signalType);break;case"loopEnd":this.addSignal(void 0,void 0,void 0,e.signalType);break;case"rectStart":this.addSignal(void 0,void 0,e.color,e.signalType);break;case"rectEnd":this.addSignal(void 0,void 0,void 0,e.signalType);break;case"optStart":this.addSignal(void 0,void 0,e.optText,e.signalType);break;case"optEnd":this.addSignal(void 0,void 0,void 0,e.signalType);break;case"altStart":this.addSignal(void 0,void 0,e.altText,e.signalType);break;case"else":this.addSignal(void 0,void 0,e.altText,e.signalType);break;case"altEnd":this.addSignal(void 0,void 0,void 0,e.signalType);break;case"setAccTitle":Lr(e.text);break;case"parStart":this.addSignal(void 0,void 0,e.parText,e.signalType);break;case"and":this.addSignal(void 0,void 0,e.parText,e.signalType);break;case"parEnd":this.addSignal(void 0,void 0,void 0,e.signalType);break;case"criticalStart":this.addSignal(void 0,void 0,e.criticalText,e.signalType);break;case"option":this.addSignal(void 0,void 0,e.optionText,e.signalType);break;case"criticalEnd":this.addSignal(void 0,void 0,void 0,e.signalType);break;case"breakStart":this.addSignal(void 0,void 0,e.breakText,e.signalType);break;case"breakEnd":this.addSignal(void 0,void 0,void 0,e.signalType);break}}getConfig(){return me().sequence}}});var nVe,mfe,gfe=N(()=>{"use strict";nVe=o(t=>`.actor { stroke: ${t.actorBorder}; fill: ${t.actorBkg}; } @@ -1359,12 +1384,12 @@ Expecting `+qe.join(", ")+", got '"+(this.terminals_[V]||V)+"'":at="Parse error fill: ${t.actorBkg}; stroke-width: 2px; } -`,"getStyles"),hfe=oVe});var AO,vf,pfe,mfe,lVe,dfe,_O,cVe,uVe,Tb,_p,gfe,Uc,DO,hVe,fVe,dVe,pVe,mVe,gVe,yVe,yfe,vVe,xVe,bVe,wVe,TVe,kVe,EVe,vfe,SVe,LO,CVe,hi,xfe=N(()=>{"use strict";gr();Wv();ir();AO=Sa(z0(),1);ji();vf=18*2,pfe="actor-top",mfe="actor-bottom",lVe="actor-box",dfe="actor-man",_O=o(function(t,e){return kd(t,e)},"drawRect"),cVe=o(function(t,e,r,n,i){if(e.links===void 0||e.links===null||Object.keys(e.links).length===0)return{height:0,width:0};let a=e.links,s=e.actorCnt,l=e.rectData;var u="none";i&&(u="block !important");let h=t.append("g");h.attr("id","actor"+s+"_popup"),h.attr("class","actorPopupMenu"),h.attr("display",u);var f="";l.class!==void 0&&(f=" "+l.class);let d=l.width>r?l.width:r,p=h.append("rect");if(p.attr("class","actorPopupMenuPanel"+f),p.attr("x",l.x),p.attr("y",l.height),p.attr("fill",l.fill),p.attr("stroke",l.stroke),p.attr("width",d),p.attr("height",l.height),p.attr("rx",l.rx),p.attr("ry",l.ry),a!=null){var m=20;for(let v in a){var g=h.append("a"),y=(0,AO.sanitizeUrl)(a[v]);g.attr("xlink:href",y),g.attr("target","_blank"),CVe(n)(v,g,l.x+10,l.height+m,d,20,{class:"actor"},n),m+=30}}return p.attr("height",m),{height:l.height+m,width:d}},"drawPopup"),uVe=o(function(t){return"var pu = document.getElementById('"+t+"'); if (pu != null) { pu.style.display = pu.style.display == 'block' ? 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l=i==="sandbox"?Ge(s.nodes()[0].contentDocument.body):Ge("body"),u=i==="sandbox"?s.nodes()[0].contentDocument:document;rt.init(),Y.debug(n.db);let h=i==="sandbox"?l.select(`[id="${e}"]`):Ge(`[id="${e}"]`),f=n.db.getActors(),d=n.db.getCreatedActors(),p=n.db.getDestroyedActors(),m=n.db.getBoxes(),g=n.db.getActorKeys(),y=n.db.getMessages(),v=n.db.getDiagramTitle(),x=n.db.hasAtLeastOneBox(),b=n.db.hasAtLeastOneBoxWithTitle(),w=await MVe(f,y,n);if(Ne.height=await OVe(f,w,m),hi.insertComputerIcon(h),hi.insertDatabaseIcon(h),hi.insertClockIcon(h),x&&(rt.bumpVerticalPos(Ne.boxMargin),b&&rt.bumpVerticalPos(m[0].textMaxHeight)),Ne.hideUnusedParticipants===!0){let F=new Set;y.forEach(P=>{F.add(P.from),F.add(P.to)}),g=g.filter(P=>F.has(P))}LVe(h,f,d,g,0,y,!1);let C=await FVe(y,f,w,n);hi.insertArrowHead(h),hi.insertArrowCrossHead(h),hi.insertArrowFilledHead(h),hi.insertSequenceNumber(h);function T(F,P){let z=rt.endActivation(F);z.starty+18>P&&(z.starty=P-6,P+=12),hi.drawActivation(h,z,P,Ne,D6(F.from).length),rt.insert(z.startx,P-10,z.stopx,P)}o(T,"activeEnd");let E=1,A=1,S=[],_=[],I=0;for(let F of y){let P,z,$;switch(F.type){case n.db.LINETYPE.NOTE:rt.resetVerticalPos(),z=F.noteModel,await AVe(h,z);break;case n.db.LINETYPE.ACTIVE_START:rt.newActivation(F,h,f);break;case n.db.LINETYPE.ACTIVE_END:T(F,rt.getVerticalPos());break;case n.db.LINETYPE.LOOP_START:Hc(C,F,Ne.boxMargin,Ne.boxMargin+Ne.boxTextMargin,H=>rt.newLoop(H));break;case n.db.LINETYPE.LOOP_END:P=rt.endLoop(),await hi.drawLoop(h,P,"loop",Ne),rt.bumpVerticalPos(P.stopy-rt.getVerticalPos()),rt.models.addLoop(P);break;case n.db.LINETYPE.RECT_START:Hc(C,F,Ne.boxMargin,Ne.boxMargin,H=>rt.newLoop(void 0,H.message));break;case n.db.LINETYPE.RECT_END:P=rt.endLoop(),_.push(P),rt.models.addLoop(P),rt.bumpVerticalPos(P.stopy-rt.getVerticalPos());break;case n.db.LINETYPE.OPT_START:Hc(C,F,Ne.boxMargin,Ne.boxMargin+Ne.boxTextMargin,H=>rt.newLoop(H));break;case n.db.LINETYPE.OPT_END:P=rt.endLoop(),await hi.drawLoop(h,P,"opt",Ne),rt.bumpVerticalPos(P.stopy-rt.getVerticalPos()),rt.models.addLoop(P);break;case n.db.LINETYPE.ALT_START:Hc(C,F,Ne.boxMargin,Ne.boxMargin+Ne.boxTextMargin,H=>rt.newLoop(H));break;case n.db.LINETYPE.ALT_ELSE:Hc(C,F,Ne.boxMargin+Ne.boxTextMargin,Ne.boxMargin,H=>rt.addSectionToLoop(H));break;case n.db.LINETYPE.ALT_END:P=rt.endLoop(),await hi.drawLoop(h,P,"alt",Ne),rt.bumpVerticalPos(P.stopy-rt.getVerticalPos()),rt.models.addLoop(P);break;case n.db.LINETYPE.PAR_START:case n.db.LINETYPE.PAR_OVER_START:Hc(C,F,Ne.boxMargin,Ne.boxMargin+Ne.boxTextMargin,H=>rt.newLoop(H)),rt.saveVerticalPos();break;case n.db.LINETYPE.PAR_AND:Hc(C,F,Ne.boxMargin+Ne.boxTextMargin,Ne.boxMargin,H=>rt.addSectionToLoop(H));break;case n.db.LINETYPE.PAR_END:P=rt.endLoop(),await 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hi.drawLoop(h,P,"break",Ne),rt.bumpVerticalPos(P.stopy-rt.getVerticalPos()),rt.models.addLoop(P);break;default:try{$=F.msgModel,$.starty=rt.getVerticalPos(),$.sequenceIndex=E,$.sequenceVisible=n.db.showSequenceNumbers();let H=await _Ve(h,$);RVe(F,$,H,I,f,d,p),S.push({messageModel:$,lineStartY:H}),rt.models.addMessage($)}catch(H){Y.error("error while drawing message",H)}}[n.db.LINETYPE.SOLID_OPEN,n.db.LINETYPE.DOTTED_OPEN,n.db.LINETYPE.SOLID,n.db.LINETYPE.DOTTED,n.db.LINETYPE.SOLID_CROSS,n.db.LINETYPE.DOTTED_CROSS,n.db.LINETYPE.SOLID_POINT,n.db.LINETYPE.DOTTED_POINT,n.db.LINETYPE.BIDIRECTIONAL_SOLID,n.db.LINETYPE.BIDIRECTIONAL_DOTTED].includes(F.type)&&(E=E+A),I++}Y.debug("createdActors",d),Y.debug("destroyedActors",p),await NO(h,f,g,!1);for(let F of S)await DVe(h,F.messageModel,F.lineStartY,n);Ne.mirrorActors&&await NO(h,f,g,!0),_.forEach(F=>hi.drawBackgroundRect(h,F)),DO(h,f,g,Ne);for(let F of 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z=rt.endActivation(B);z.starty+18>F&&(z.starty=F-6,F+=12),hi.drawActivation(h,z,F,Ne,OS(B.from).length),rt.insert(z.startx,F-10,z.stopx,F)}o(T,"activeEnd");let E=1,A=1,S=[],_=[],I=0;for(let B of y){let F,z,$;switch(B.type){case n.db.LINETYPE.NOTE:rt.resetVerticalPos(),z=B.noteModel,await kVe(h,z);break;case n.db.LINETYPE.ACTIVE_START:rt.newActivation(B,h,f);break;case n.db.LINETYPE.ACTIVE_END:T(B,rt.getVerticalPos());break;case n.db.LINETYPE.LOOP_START:Xc(C,B,Ne.boxMargin,Ne.boxMargin+Ne.boxTextMargin,U=>rt.newLoop(U));break;case n.db.LINETYPE.LOOP_END:F=rt.endLoop(),await hi.drawLoop(h,F,"loop",Ne),rt.bumpVerticalPos(F.stopy-rt.getVerticalPos()),rt.models.addLoop(F);break;case n.db.LINETYPE.RECT_START:Xc(C,B,Ne.boxMargin,Ne.boxMargin,U=>rt.newLoop(void 0,U.message));break;case n.db.LINETYPE.RECT_END:F=rt.endLoop(),_.push(F),rt.models.addLoop(F),rt.bumpVerticalPos(F.stopy-rt.getVerticalPos());break;case 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95:this.$=V[W-1]+V[W];break}},"anonymous"),table:[{3:1,4:2,5:3,6:4,7:[1,6],10:5,16:39,18:21,19:40,21:7,23:8,24:9,25:10,26:11,27:12,28:13,29:14,30:15,31:16,32:17,33:e,35:r,37:n,38:22,42:i,43:23,46:a,47:s,49:l,50:u,52:h,54:f,55:d,58:p,60:m,61:g,62:y,63:v,73:x,74:b,76:w,80:C,81:T,84:E,99:A,101:S,102:_},{1:[3]},{1:[2,1]},{1:[2,2]},{1:[2,3]},t(I,[2,5],{8:[1,48]}),{8:[1,49]},t(L,[2,18],{22:[1,50]}),t(L,[2,20]),t(L,[2,21]),t(L,[2,22]),t(L,[2,23]),t(L,[2,24]),t(L,[2,25]),t(L,[2,26]),t(L,[2,27]),t(L,[2,28]),t(L,[2,29]),{34:[1,51]},{36:[1,52]},t(L,[2,32]),t(L,[2,48],{51:53,64:56,65:57,13:[1,54],22:[1,55],66:k,67:D,68:R,69:O,70:M,71:P,72:B}),{39:[1,65]},t(F,[2,39],{39:[1,67],44:[1,66]}),t(L,[2,50]),t(L,[2,51]),{16:68,58:p,84:E,99:A,101:S},{16:39,18:69,19:40,58:p,84:E,99:A,101:S,102:_},{16:39,18:70,19:40,58:p,84:E,99:A,101:S,102:_},{16:39,18:71,19:40,58:p,84:E,99:A,101:S,102:_},{58:[1,72]},{13:[1,73]},{16:39,18:74,19:40,58:p,84:E,99:A,101:S,102:_},{13:z,53:75},{56:77,58:[1,78]},t(L,[2,61]),t(L,[2,62]),t(L,[2,63]),t(L,[2,64]),t($,[2,12],{16:39,19:40,18:80,17:[1,79],20:[1,81],58:p,84:E,99:A,101:S,102:_}),t($,[2,14],{20:[1,82]}),{15:83,16:84,58:p,84:E,99:A,101:S},{16:39,18:85,19:40,58:p,84:E,99:A,101:S,102:_},t(U,[2,118]),t(U,[2,119]),t(U,[2,120]),t(U,[2,121]),t([1,8,9,12,13,20,22,39,41,44,66,67,68,69,70,71,72,77,79],[2,122]),t(I,[2,6],{10:5,21:7,23:8,24:9,25:10,26:11,27:12,28:13,29:14,30:15,31:16,32:17,18:21,38:22,43:23,16:39,19:40,5:86,33:e,35:r,37:n,42:i,46:a,47:s,49:l,50:u,52:h,54:f,55:d,58:p,60:m,61:g,62:y,63:v,73:x,74:b,76:w,80:C,81:T,84:E,99:A,101:S,102:_}),{5:87,10:5,16:39,18:21,19:40,21:7,23:8,24:9,25:10,26:11,27:12,28:13,29:14,30:15,31:16,32:17,33:e,35:r,37:n,38:22,42:i,43:23,46:a,47:s,49:l,50:u,52:h,54:f,55:d,58:p,60:m,61:g,62:y,63:v,73:x,74:b,76:w,80:C,81:T,84:E,99:A,101:S,102:_},t(L,[2,19]),t(L,[2,30]),t(L,[2,31]),{13:[1,89],16:39,18:88,19:40,58:p,84:E,99:A,101:S,102:_},{51:90,64:56,65:57,66:k,67:D,68:R,69:O,70:M,71:P,72:B},t(L,[2,49]),{65:91,71:P,72:B},t(Q,[2,68],{64:92,66:k,67:D,68:R,69:O,70:M}),t(te,[2,69]),t(te,[2,70]),t(te,[2,71]),t(te,[2,72]),t(te,[2,73]),t(Y,[2,74]),t(Y,[2,75]),{8:[1,94],24:95,40:93,43:23,46:a},{16:96,58:p,84:E,99:A,101:S},{45:97,49:he},{48:[1,99]},{13:[1,100]},{13:[1,101]},{77:[1,102],79:[1,103]},{22:Z,57:104,58:ue,80:K,82:105,83:106,84:j,85:ne,86:ee,87:ce,88:le,89:J},{58:[1,116]},{13:z,53:117},t(L,[2,57]),t(L,[2,123]),{22:Z,57:118,58:ue,59:[1,119],80:K,82:105,83:106,84:j,85:ne,86:ee,87:ce,88:le,89:J},t(Se,[2,59]),{16:39,18:120,19:40,58:p,84:E,99:A,101:S,102:_},t($,[2,15]),t($,[2,16]),t($,[2,17]),{39:[2,35]},{15:122,16:84,17:[1,121],39:[2,9],58:p,84:E,99:A,101:S},t(se,[2,43],{11:123,12:[1,124]}),t(I,[2,7]),{9:[1,125]},t(ae,[2,52]),{16:39,18:126,19:40,58:p,84:E,99:A,101:S,102:_},{13:[1,128],16:39,18:127,19:40,58:p,84:E,99:A,101:S,102:_},t(Q,[2,67],{64:129,66:k,67:D,68:R,69:O,70:M}),t(Q,[2,66]),{41:[1,130]},{24:95,40:131,43:23,46:a},{8:[1,132],41:[2,36]},t(F,[2,40],{39:[1,133]}),{41:[1,134]},{41:[2,46],45:135,49:he},{16:39,18:136,19:40,58:p,84:E,99:A,101:S,102:_},t(L,[2,76],{13:[1,137]}),t(L,[2,78],{13:[1,139],75:[1,138]}),t(L,[2,82],{13:[1,140],78:[1,141]}),{13:[1,142]},t(L,[2,90],{59:Oe}),t(ye,[2,92],{83:144,22:Z,58:ue,80:K,84:j,85:ne,86:ee,87:ce,88:le,89:J}),t(Be,[2,94]),t(Be,[2,96]),t(Be,[2,97]),t(Be,[2,98]),t(Be,[2,99]),t(Be,[2,100]),t(Be,[2,101]),t(Be,[2,102]),t(Be,[2,103]),t(Be,[2,104]),t(L,[2,91]),t(L,[2,56]),t(L,[2,58],{59:Oe}),{58:[1,145]},t($,[2,13]),{15:146,16:84,58:p,84:E,99:A,101:S},{39:[2,11]},t(se,[2,44]),{13:[1,147]},{1:[2,4]},t(ae,[2,54]),t(ae,[2,53]),{16:39,18:148,19:40,58:p,84:E,99:A,101:S,102:_},t(Q,[2,65]),t(L,[2,33]),{41:[1,149]},{24:95,40:150,41:[2,37],43:23,46:a},{45:151,49:he},t(F,[2,41]),{41:[2,47]},t(L,[2,45]),t(L,[2,77]),t(L,[2,79]),t(L,[2,80],{75:[1,152]}),t(L,[2,83]),t(L,[2,84],{13:[1,153]}),t(L,[2,86],{13:[1,155],75:[1,154]}),{22:Z,58:ue,80:K,82:156,83:106,84:j,85:ne,86:ee,87:ce,88:le,89:J},t(Be,[2,95]),t(Se,[2,60]),{39:[2,10]},{14:[1,157]},t(ae,[2,55]),t(L,[2,34]),{41:[2,38]},{41:[1,158]},t(L,[2,81]),t(L,[2,85]),t(L,[2,87]),t(L,[2,88],{75:[1,159]}),t(ye,[2,93],{83:144,22:Z,58:ue,80:K,84:j,85:ne,86:ee,87:ce,88:le,89:J}),t(se,[2,8]),t(F,[2,42]),t(L,[2,89])],defaultActions:{2:[2,1],3:[2,2],4:[2,3],83:[2,35],122:[2,11],125:[2,4],135:[2,47],146:[2,10],150:[2,38]},parseError:o(function(xe,q){if(q.recoverable)this.trace(xe);else{var de=new Error(xe);throw de.hash=q,de}},"parseError"),parse:o(function(xe){var q=this,de=[0],ie=[],oe=[null],V=[],we=this.table,W="",pe=0,ve=0,Pe=0,_e=2,be=1,Ve=V.slice.call(arguments,1),De=Object.create(this.lexer),qe={yy:{}};for(var at in this.yy)Object.prototype.hasOwnProperty.call(this.yy,at)&&(qe.yy[at]=this.yy[at]);De.setInput(xe,qe.yy),qe.yy.lexer=De,qe.yy.parser=this,typeof De.yylloc>"u"&&(De.yylloc={});var Lt=De.yylloc;V.push(Lt);var st=De.options&&De.options.ranges;typeof qe.yy.parseError=="function"?this.parseError=qe.yy.parseError:this.parseError=Object.getPrototypeOf(this).parseError;function Ue(Tt){de.length=de.length-2*Tt,oe.length=oe.length-Tt,V.length=V.length-Tt}o(Ue,"popStack");function ct(){var Tt;return Tt=ie.pop()||De.lex()||be,typeof Tt!="number"&&(Tt instanceof Array&&(ie=Tt,Tt=ie.pop()),Tt=q.symbols_[Tt]||Tt),Tt}o(ct,"lex");for(var We,ot,Yt,bt,Mt,xt,ut={},Et,ft,yt,nt;;){if(Yt=de[de.length-1],this.defaultActions[Yt]?bt=this.defaultActions[Yt]:((We===null||typeof We>"u")&&(We=ct()),bt=we[Yt]&&we[Yt][We]),typeof bt>"u"||!bt.length||!bt[0]){var dn="";nt=[];for(Et in we[Yt])this.terminals_[Et]&&Et>_e&&nt.push("'"+this.terminals_[Et]+"'");De.showPosition?dn="Parse error on line "+(pe+1)+`: `+De.showPosition()+` -Expecting `+nt.join(", ")+", got '"+(this.terminals_[We]||We)+"'":dn="Parse error on line "+(pe+1)+": Unexpected "+(We==we?"end of input":"'"+(this.terminals_[We]||We)+"'"),this.parseError(dn,{text:De.match,token:this.terminals_[We]||We,line:De.yylineno,loc:Rt,expected:nt})}if(bt[0]instanceof Array&&bt.length>1)throw new Error("Parse Error: multiple actions possible at state: "+Yt+", token: "+We);switch(bt[0]){case 1:de.push(We),oe.push(De.yytext),V.push(De.yylloc),de.push(bt[1]),We=null,ot?(We=ot,ot=null):(ve=De.yyleng,q=De.yytext,pe=De.yylineno,Rt=De.yylloc,Pe>0&&Pe--);break;case 2:if(ft=this.productions_[bt[1]][1],ut.$=oe[oe.length-ft],ut._$={first_line:V[V.length-(ft||1)].first_line,last_line:V[V.length-1].last_line,first_column:V[V.length-(ft||1)].first_column,last_column:V[V.length-1].last_column},st&&(ut._$.range=[V[V.length-(ft||1)].range[0],V[V.length-1].range[1]]),xt=this.performAction.apply(ut,[q,ve,pe,qe.yy,bt[1],oe,V].concat(Ve)),typeof xt<"u")return xt;ft&&(de=de.slice(0,-1*ft*2),oe=oe.slice(0,-1*ft),V=V.slice(0,-1*ft)),de.push(this.productions_[bt[1]][0]),oe.push(ut.$),V.push(ut._$),yt=xe[de[de.length-2]][de[de.length-1]],de.push(yt);break;case 3:return!0}}return!0},"parse")},$e=function(){var Ie={EOF:1,parseError:o(function(W,de){if(this.yy.parser)this.yy.parser.parseError(W,de);else throw new Error(W)},"parseError"),setInput:o(function(be,W){return this.yy=W||this.yy||{},this._input=be,this._more=this._backtrack=this.done=!1,this.yylineno=this.yyleng=0,this.yytext=this.matched=this.match="",this.conditionStack=["INITIAL"],this.yylloc={first_line:1,first_column:0,last_line:1,last_column:0},this.options.ranges&&(this.yylloc.range=[0,0]),this.offset=0,this},"setInput"),input:o(function(){var be=this._input[0];this.yytext+=be,this.yyleng++,this.offset++,this.match+=be,this.matched+=be;var W=be.match(/(?:\r\n?|\n).*/g);return W?(this.yylineno++,this.yylloc.last_line++):this.yylloc.last_column++,this.options.ranges&&this.yylloc.range[1]++,this._input=this._input.slice(1),be},"input"),unput:o(function(be){var W=be.length,de=be.split(/(?:\r\n?|\n)/g);this._input=be+this._input,this.yytext=this.yytext.substr(0,this.yytext.length-W),this.offset-=W;var re=this.match.split(/(?:\r\n?|\n)/g);this.match=this.match.substr(0,this.match.length-1),this.matched=this.matched.substr(0,this.matched.length-1),de.length-1&&(this.yylineno-=de.length-1);var oe=this.yylloc.range;return this.yylloc={first_line:this.yylloc.first_line,last_line:this.yylineno+1,first_column:this.yylloc.first_column,last_column:de?(de.length===re.length?this.yylloc.first_column:0)+re[re.length-de.length].length-de[0].length:this.yylloc.first_column-W},this.options.ranges&&(this.yylloc.range=[oe[0],oe[0]+this.yyleng-W]),this.yyleng=this.yytext.length,this},"unput"),more:o(function(){return this._more=!0,this},"more"),reject:o(function(){if(this.options.backtrack_lexer)this._backtrack=!0;else return this.parseError("Lexical error on line "+(this.yylineno+1)+`. You can only invoke reject() in the lexer when the lexer is of the backtracking persuasion (options.backtrack_lexer = true). -`+this.showPosition(),{text:"",token:null,line:this.yylineno});return this},"reject"),less:o(function(be){this.unput(this.match.slice(be))},"less"),pastInput:o(function(){var be=this.matched.substr(0,this.matched.length-this.match.length);return(be.length>20?"...":"")+be.substr(-20).replace(/\n/g,"")},"pastInput"),upcomingInput:o(function(){var be=this.match;return be.length<20&&(be+=this._input.substr(0,20-be.length)),(be.substr(0,20)+(be.length>20?"...":"")).replace(/\n/g,"")},"upcomingInput"),showPosition:o(function(){var be=this.pastInput(),W=new Array(be.length+1).join("-");return be+this.upcomingInput()+` -`+W+"^"},"showPosition"),test_match:o(function(be,W){var de,re,oe;if(this.options.backtrack_lexer&&(oe={yylineno:this.yylineno,yylloc:{first_line:this.yylloc.first_line,last_line:this.last_line,first_column:this.yylloc.first_column,last_column:this.yylloc.last_column},yytext:this.yytext,match:this.match,matches:this.matches,matched:this.matched,yyleng:this.yyleng,offset:this.offset,_more:this._more,_input:this._input,yy:this.yy,conditionStack:this.conditionStack.slice(0),done:this.done},this.options.ranges&&(oe.yylloc.range=this.yylloc.range.slice(0))),re=be[0].match(/(?:\r\n?|\n).*/g),re&&(this.yylineno+=re.length),this.yylloc={first_line:this.yylloc.last_line,last_line:this.yylineno+1,first_column:this.yylloc.last_column,last_column:re?re[re.length-1].length-re[re.length-1].match(/\r?\n?/)[0].length:this.yylloc.last_column+be[0].length},this.yytext+=be[0],this.match+=be[0],this.matches=be,this.yyleng=this.yytext.length,this.options.ranges&&(this.yylloc.range=[this.offset,this.offset+=this.yyleng]),this._more=!1,this._backtrack=!1,this._input=this._input.slice(be[0].length),this.matched+=be[0],de=this.performAction.call(this,this.yy,this,W,this.conditionStack[this.conditionStack.length-1]),this.done&&this._input&&(this.done=!1),de)return de;if(this._backtrack){for(var V in oe)this[V]=oe[V];return!1}return!1},"test_match"),next:o(function(){if(this.done)return this.EOF;this._input||(this.done=!0);var be,W,de,re;this._more||(this.yytext="",this.match="");for(var oe=this._currentRules(),V=0;VW[0].length)){if(W=de,re=V,this.options.backtrack_lexer){if(be=this.test_match(de,oe[V]),be!==!1)return be;if(this._backtrack){W=!1;continue}else return!1}else if(!this.options.flex)break}return W?(be=this.test_match(W,oe[re]),be!==!1?be:!1):this._input===""?this.EOF:this.parseError("Lexical error on line "+(this.yylineno+1)+`. Unrecognized text. -`+this.showPosition(),{text:"",token:null,line:this.yylineno})},"next"),lex:o(function(){var W=this.next();return W||this.lex()},"lex"),begin:o(function(W){this.conditionStack.push(W)},"begin"),popState:o(function(){var W=this.conditionStack.length-1;return W>0?this.conditionStack.pop():this.conditionStack[0]},"popState"),_currentRules:o(function(){return this.conditionStack.length&&this.conditionStack[this.conditionStack.length-1]?this.conditions[this.conditionStack[this.conditionStack.length-1]].rules:this.conditions.INITIAL.rules},"_currentRules"),topState:o(function(W){return W=this.conditionStack.length-1-Math.abs(W||0),W>=0?this.conditionStack[W]:"INITIAL"},"topState"),pushState:o(function(W){this.begin(W)},"pushState"),stateStackSize:o(function(){return this.conditionStack.length},"stateStackSize"),options:{},performAction:o(function(W,de,re,oe){var V=oe;switch(re){case 0:return 60;case 1:return 61;case 2:return 62;case 3:return 63;case 4:break;case 5:break;case 6:return this.begin("acc_title"),33;break;case 7:return this.popState(),"acc_title_value";break;case 8:return this.begin("acc_descr"),35;break;case 9:return this.popState(),"acc_descr_value";break;case 10:this.begin("acc_descr_multiline");break;case 11:this.popState();break;case 12:return"acc_descr_multiline_value";case 13:return 8;case 14:break;case 15:return 7;case 16:return 7;case 17:return"EDGE_STATE";case 18:this.begin("callback_name");break;case 19:this.popState();break;case 20:this.popState(),this.begin("callback_args");break;case 21:return 77;case 22:this.popState();break;case 23:return 78;case 24:this.popState();break;case 25:return"STR";case 26:this.begin("string");break;case 27:return 80;case 28:return 55;case 29:return this.begin("namespace"),42;break;case 30:return this.popState(),8;break;case 31:break;case 32:return this.begin("namespace-body"),39;break;case 33:return this.popState(),41;break;case 34:return"EOF_IN_STRUCT";case 35:return 8;case 36:break;case 37:return"EDGE_STATE";case 38:return this.begin("class"),46;break;case 39:return this.popState(),8;break;case 40:break;case 41:return this.popState(),this.popState(),41;break;case 42:return this.begin("class-body"),39;break;case 43:return this.popState(),41;break;case 44:return"EOF_IN_STRUCT";case 45:return"EDGE_STATE";case 46:return"OPEN_IN_STRUCT";case 47:break;case 48:return"MEMBER";case 49:return 81;case 50:return 73;case 51:return 74;case 52:return 76;case 53:return 52;case 54:return 54;case 55:return 47;case 56:return 48;case 57:return 79;case 58:this.popState();break;case 59:return"GENERICTYPE";case 60:this.begin("generic");break;case 61:this.popState();break;case 62:return"BQUOTE_STR";case 63:this.begin("bqstring");break;case 64:return 75;case 65:return 75;case 66:return 75;case 67:return 75;case 68:return 67;case 69:return 67;case 70:return 69;case 71:return 69;case 72:return 68;case 73:return 66;case 74:return 70;case 75:return 71;case 76:return 72;case 77:return 22;case 78:return 44;case 79:return 99;case 80:return 17;case 81:return"PLUS";case 82:return 85;case 83:return 59;case 84:return 88;case 85:return 88;case 86:return 89;case 87:return"EQUALS";case 88:return"EQUALS";case 89:return 58;case 90:return 12;case 91:return 14;case 92:return"PUNCTUATION";case 93:return 84;case 94:return 101;case 95:return 87;case 96:return 87;case 97:return 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Map,this.notes=[],this.interfaces=[],this.functions=[],this.functions.push(this.setupToolTips.bind(this)),this.namespaces=new Map,this.namespaceCounter=0,this.direction="TB",Ar()}getClass(e){return this.classes.get(e)}getClasses(){return this.classes}getRelations(){return this.relations}getNotes(){return this.notes}addRelation(e){Y.debug("Adding relation: "+JSON.stringify(e));let r=[this.relationType.LOLLIPOP,this.relationType.AGGREGATION,this.relationType.COMPOSITION,this.relationType.DEPENDENCY,this.relationType.EXTENSION];e.relation.type1===this.relationType.LOLLIPOP&&!r.includes(e.relation.type2)?(this.addClass(e.id2),this.addInterface(e.id1,e.id2),e.id1=`interface${this.interfaces.length-1}`):e.relation.type2===this.relationType.LOLLIPOP&&!r.includes(e.relation.type1)?(this.addClass(e.id1),this.addInterface(e.id2,e.id1),e.id2=`interface${this.interfaces.length-1}`):(this.addClass(e.id1),this.addClass(e.id2)),e.id1=this.splitClassNameAndType(e.id1).className,e.id2=this.splitClassNameAndType(e.id2).className,e.relationTitle1=Ze.sanitizeText(e.relationTitle1.trim(),me()),e.relationTitle2=Ze.sanitizeText(e.relationTitle2.trim(),me()),this.relations.push(e)}addAnnotation(e,r){let n=this.splitClassNameAndType(e).className;this.classes.get(n).annotations.push(r)}addMember(e,r){this.addClass(e);let 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You can only invoke reject() in the lexer when the lexer is of the backtracking persuasion (options.backtrack_lexer = true). +Expecting `+Z.join(", ")+", got '"+(this.terminals_[P]||P)+"'":ue="Parse error on line "+(C+1)+": Unexpected "+(P==S?"end of input":"'"+(this.terminals_[P]||P)+"'"),this.parseError(ue,{text:I.match,token:this.terminals_[P]||P,line:I.yylineno,loc:D,expected:Z})}if(z[0]instanceof Array&&z.length>1)throw new Error("Parse Error: multiple actions possible at state: "+F+", token: "+P);switch(z[0]){case 1:g.push(P),v.push(I.yytext),x.push(I.yylloc),g.push(z[1]),P=null,B?(P=B,B=null):(T=I.yyleng,w=I.yytext,C=I.yylineno,D=I.yylloc,E>0&&E--);break;case 2:if(Y=this.productions_[z[1]][1],Q.$=v[v.length-Y],Q._$={first_line:x[x.length-(Y||1)].first_line,last_line:x[x.length-1].last_line,first_column:x[x.length-(Y||1)].first_column,last_column:x[x.length-1].last_column},R&&(Q._$.range=[x[x.length-(Y||1)].range[0],x[x.length-1].range[1]]),U=this.performAction.apply(Q,[w,T,C,L.yy,z[1],v,x].concat(_)),typeof U<"u")return U;Y&&(g=g.slice(0,-1*Y*2),v=v.slice(0,-1*Y),x=x.slice(0,-1*Y)),g.push(this.productions_[z[1]][0]),v.push(Q.$),x.push(Q._$),he=b[g[g.length-2]][g[g.length-1]],g.push(he);break;case 3:return!0}}return!0},"parse")},h=function(){var d={EOF:1,parseError:o(function(m,g){if(this.yy.parser)this.yy.parser.parseError(m,g);else throw new Error(m)},"parseError"),setInput:o(function(p,m){return this.yy=m||this.yy||{},this._input=p,this._more=this._backtrack=this.done=!1,this.yylineno=this.yyleng=0,this.yytext=this.matched=this.match="",this.conditionStack=["INITIAL"],this.yylloc={first_line:1,first_column:0,last_line:1,last_column:0},this.options.ranges&&(this.yylloc.range=[0,0]),this.offset=0,this},"setInput"),input:o(function(){var p=this._input[0];this.yytext+=p,this.yyleng++,this.offset++,this.match+=p,this.matched+=p;var m=p.match(/(?:\r\n?|\n).*/g);return m?(this.yylineno++,this.yylloc.last_line++):this.yylloc.last_column++,this.options.ranges&&this.yylloc.range[1]++,this._input=this._input.slice(1),p},"input"),unput:o(function(p){var m=p.length,g=p.split(/(?:\r\n?|\n)/g);this._input=p+this._input,this.yytext=this.yytext.substr(0,this.yytext.length-m),this.offset-=m;var y=this.match.split(/(?:\r\n?|\n)/g);this.match=this.match.substr(0,this.match.length-1),this.matched=this.matched.substr(0,this.matched.length-1),g.length-1&&(this.yylineno-=g.length-1);var v=this.yylloc.range;return this.yylloc={first_line:this.yylloc.first_line,last_line:this.yylineno+1,first_column:this.yylloc.first_column,last_column:g?(g.length===y.length?this.yylloc.first_column:0)+y[y.length-g.length].length-g[0].length:this.yylloc.first_column-m},this.options.ranges&&(this.yylloc.range=[v[0],v[0]+this.yyleng-m]),this.yyleng=this.yytext.length,this},"unput"),more:o(function(){return this._more=!0,this},"more"),reject:o(function(){if(this.options.backtrack_lexer)this._backtrack=!0;else return this.parseError("Lexical error on line "+(this.yylineno+1)+`. You can only invoke reject() in the lexer when the lexer is of the backtracking persuasion (options.backtrack_lexer = true). `+this.showPosition(),{text:"",token:null,line:this.yylineno});return this},"reject"),less:o(function(p){this.unput(this.match.slice(p))},"less"),pastInput:o(function(){var p=this.matched.substr(0,this.matched.length-this.match.length);return(p.length>20?"...":"")+p.substr(-20).replace(/\n/g,"")},"pastInput"),upcomingInput:o(function(){var p=this.match;return p.length<20&&(p+=this._input.substr(0,20-p.length)),(p.substr(0,20)+(p.length>20?"...":"")).replace(/\n/g,"")},"upcomingInput"),showPosition:o(function(){var p=this.pastInput(),m=new Array(p.length+1).join("-");return p+this.upcomingInput()+` `+m+"^"},"showPosition"),test_match:o(function(p,m){var g,y,v;if(this.options.backtrack_lexer&&(v={yylineno:this.yylineno,yylloc:{first_line:this.yylloc.first_line,last_line:this.last_line,first_column:this.yylloc.first_column,last_column:this.yylloc.last_column},yytext:this.yytext,match:this.match,matches:this.matches,matched:this.matched,yyleng:this.yyleng,offset:this.offset,_more:this._more,_input:this._input,yy:this.yy,conditionStack:this.conditionStack.slice(0),done:this.done},this.options.ranges&&(v.yylloc.range=this.yylloc.range.slice(0))),y=p[0].match(/(?:\r\n?|\n).*/g),y&&(this.yylineno+=y.length),this.yylloc={first_line:this.yylloc.last_line,last_line:this.yylineno+1,first_column:this.yylloc.last_column,last_column:y?y[y.length-1].length-y[y.length-1].match(/\r?\n?/)[0].length:this.yylloc.last_column+p[0].length},this.yytext+=p[0],this.match+=p[0],this.matches=p,this.yyleng=this.yytext.length,this.options.ranges&&(this.yylloc.range=[this.offset,this.offset+=this.yyleng]),this._more=!1,this._backtrack=!1,this._input=this._input.slice(p[0].length),this.matched+=p[0],g=this.performAction.call(this,this.yy,this,m,this.conditionStack[this.conditionStack.length-1]),this.done&&this._input&&(this.done=!1),g)return g;if(this._backtrack){for(var x in v)this[x]=v[x];return!1}return!1},"test_match"),next:o(function(){if(this.done)return this.EOF;this._input||(this.done=!0);var p,m,g,y;this._more||(this.yytext="",this.match="");for(var v=this._currentRules(),x=0;xm[0].length)){if(m=g,y=x,this.options.backtrack_lexer){if(p=this.test_match(g,v[x]),p!==!1)return p;if(this._backtrack){m=!1;continue}else return!1}else if(!this.options.flex)break}return m?(p=this.test_match(m,v[y]),p!==!1?p:!1):this._input===""?this.EOF:this.parseError("Lexical error on line "+(this.yylineno+1)+`. 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5:return 4;case 6:return 11;case 7:return this.begin("acc_title"),12;break;case 8:return this.popState(),"acc_title_value";break;case 9:return this.begin("acc_descr"),14;break;case 10:return this.popState(),"acc_descr_value";break;case 11:this.begin("acc_descr_multiline");break;case 12:this.popState();break;case 13:return"acc_descr_multiline_value";case 14:return 17;case 15:return 18;case 16:return 19;case 17:return":";case 18:return 6;case 19:return"INVALID"}},"anonymous"),rules:[/^(?:%(?!\{)[^\n]*)/i,/^(?:[^\}]%%[^\n]*)/i,/^(?:[\n]+)/i,/^(?:\s+)/i,/^(?:#[^\n]*)/i,/^(?:journey\b)/i,/^(?:title\s[^#\n;]+)/i,/^(?:accTitle\s*:\s*)/i,/^(?:(?!\n||)*[^\n]*)/i,/^(?:accDescr\s*:\s*)/i,/^(?:(?!\n||)*[^\n]*)/i,/^(?:accDescr\s*\{\s*)/i,/^(?:[\}])/i,/^(?:[^\}]*)/i,/^(?:section\s[^#:\n;]+)/i,/^(?:[^#:\n;]+)/i,/^(?::[^#\n;]+)/i,/^(?::)/i,/^(?:$)/i,/^(?:.)/i],conditions:{acc_descr_multiline:{rules:[12,13],inclusive:!1},acc_descr:{rules:[10],inclusive:!1},acc_title:{rules:[8],inclusive:!1},INITIAL:{rules:[0,1,2,3,4,5,6,7,9,11,14,15,16,17,18,19],inclusive:!0}}};return d}();u.lexer=h;function f(){this.yy={}}return o(f,"Parser"),f.prototype=u,u.Parser=f,new f}();sP.parser=sP;Lde=sP});var M1,oP,Sb,Cb,BUe,FUe,$Ue,zUe,GUe,VUe,UUe,Nde,HUe,lP,Mde=N(()=>{"use strict";zt();mi();M1="",oP=[],Sb=[],Cb=[],BUe=o(function(){oP.length=0,Sb.length=0,M1="",Cb.length=0,Ar()},"clear"),FUe=o(function(t){M1=t,oP.push(t)},"addSection"),$Ue=o(function(){return oP},"getSections"),zUe=o(function(){let t=Nde(),e=100,r=0;for(;!t&&r{r.people&&t.push(...r.people)}),[...new Set(t)].sort()},"updateActors"),VUe=o(function(t,e){let r=e.substr(1).split(":"),n=0,i=[];r.length===1?(n=Number(r[0]),i=[]):(n=Number(r[0]),i=r[1].split(","));let a=i.map(l=>l.trim()),s={section:M1,type:M1,people:a,task:t,score:n};Cb.push(s)},"addTask"),UUe=o(function(t){let e={section:M1,type:M1,description:t,task:t,classes:[]};Sb.push(e)},"addTaskOrg"),Nde=o(function(){let t=o(function(r){return Cb[r].processed},"compileTask"),e=!0;for(let[r,n]of Cb.entries())t(r),e=e&&n.processed;return e},"compileTasks"),HUe=o(function(){return GUe()},"getActors"),lP={getConfig:o(()=>me().journey,"getConfig"),clear:BUe,setDiagramTitle:$r,getDiagramTitle:Ir,setAccTitle:Lr,getAccTitle:Rr,setAccDescription:Nr,getAccDescription:Mr,addSection:FUe,getSections:$Ue,getTasks:zUe,addTask:VUe,addTaskOrg:UUe,getActors:HUe}});var WUe,Ide,Ode=N(()=>{"use strict";WUe=o(t=>`.label { 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11;case 7:return this.begin("acc_title"),12;break;case 8:return this.popState(),"acc_title_value";break;case 9:return this.begin("acc_descr"),14;break;case 10:return this.popState(),"acc_descr_value";break;case 11:this.begin("acc_descr_multiline");break;case 12:this.popState();break;case 13:return"acc_descr_multiline_value";case 14:return 17;case 15:return 18;case 16:return 19;case 17:return":";case 18:return 6;case 19:return"INVALID"}},"anonymous"),rules:[/^(?:%(?!\{)[^\n]*)/i,/^(?:[^\}]%%[^\n]*)/i,/^(?:[\n]+)/i,/^(?:\s+)/i,/^(?:#[^\n]*)/i,/^(?:journey\b)/i,/^(?:title\s[^#\n;]+)/i,/^(?:accTitle\s*:\s*)/i,/^(?:(?!\n||)*[^\n]*)/i,/^(?:accDescr\s*:\s*)/i,/^(?:(?!\n||)*[^\n]*)/i,/^(?:accDescr\s*\{\s*)/i,/^(?:[\}])/i,/^(?:[^\}]*)/i,/^(?:section\s[^#:\n;]+)/i,/^(?:[^#:\n;]+)/i,/^(?::[^#\n;]+)/i,/^(?::)/i,/^(?:$)/i,/^(?:.)/i],conditions:{acc_descr_multiline:{rules:[12,13],inclusive:!1},acc_descr:{rules:[10],inclusive:!1},acc_title:{rules:[8],inclusive:!1},INITIAL:{rules:[0,1,2,3,4,5,6,7,9,11,14,15,16,17,18,19],inclusive:!0}}};return d}();u.lexer=h;function f(){this.yy={}}return o(f,"Parser"),f.prototype=u,u.Parser=f,new f}();cP.parser=cP;Cde=cP});var z1,uP,Nb,Mb,_Ue,DUe,LUe,RUe,NUe,MUe,IUe,_de,OUe,hP,Dde=N(()=>{"use strict";zt();mi();z1="",uP=[],Nb=[],Mb=[],_Ue=o(function(){uP.length=0,Nb.length=0,z1="",Mb.length=0,Ar()},"clear"),DUe=o(function(t){z1=t,uP.push(t)},"addSection"),LUe=o(function(){return 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0?s:l.styleEnabled,zoom:Ct(l.zoom)?l.zoom:1,pan:{x:Ur(l.pan)&&Ct(l.pan.x)?l.pan.x:0,y:Ur(l.pan)&&Ct(l.pan.y)?l.pan.y:0},animation:{current:[],queue:[]},hasCompoundNodes:!1,multiClickDebounceTime:u(250,l.multiClickDebounceTime)};this.createEmitter(),this.selectionType(l.selectionType),this.zoomRange({min:l.minZoom,max:l.maxZoom});var f=o(function(g,y){var v=g.some(nWe);if(v)return ey.all(g).then(y);y(g)},"loadExtData");h.styleEnabled&&r.setStyle([]);var d=rr({},l,l.renderer);r.initRenderer(d);var p=o(function(g,y,v){r.notifications(!1);var x=r.mutableElements();x.length>0&&x.remove(),g!=null&&(Ur(g)||En(g))&&r.add(g),r.one("layoutready",function(w){r.notifications(!0),r.emit(w),r.one("load",y),r.emitAndNotify("load")}).one("layoutstop",function(){r.one("done",v),r.emit("done")});var b=rr({},r._private.options.layout);b.eles=r.elements(),r.layout(b).run()},"setElesAndLayout");f([l.style,l.elements],function(m){var g=m[0],y=m[1];h.styleEnabled&&r.style().append(g),p(y,function(){r.startAnimationLoop(),h.ready=!0,si(l.ready)&&r.on("ready",l.ready);for(var v=0;v0,l=!!t.boundingBox,u=e.extent(),h=Hs(l?t.boundingBox:{x1:u.x1,y1:u.y1,w:u.w,h:u.h}),f;if(go(t.roots))f=t.roots;else if(En(t.roots)){for(var d=[],p=0;p0;){var O=R(),M=I(O,k);if(M)O.outgoers().filter(function(ae){return ae.isNode()&&r.has(ae)}).forEach(L);else if(M===null){un("Detected double maximal shift for node `"+O.id()+"`. Bailing maximal adjustment due to cycle. Use `options.maximal: true` only on DAGs.");break}}}var B=0;if(t.avoidOverlap)for(var F=0;F0&&b[0].length<=3?$e/2:0),Ie=2*Math.PI/b[ze].length*He;return ze===0&&b[0].length===1&&(Re=1),{x:se.x+Re*Math.cos(Ie),y:se.y+Re*Math.sin(Ie)}}else{var be=b[ze].length,W=Math.max(be===1?0:l?(h.w-t.padding*2-ue.w)/((t.grid?Se:be)-1):(h.w-t.padding*2-ue.w)/((t.grid?Se:be)+1),B),de={x:se.x+(He+1-(be+1)/2)*W,y:se.y+(ze+1-(ne+1)/2)*Z};return de}},"getPosition");return r.nodes().layoutPositions(this,t,ce),this};rQe={fit:!0,padding:30,boundingBox:void 0,avoidOverlap:!0,nodeDimensionsIncludeLabels:!1,spacingFactor:void 0,radius:void 0,startAngle:3/2*Math.PI,sweep:void 0,clockwise:!0,sort:void 0,animate:!1,animationDuration:500,animationEasing:void 0,animateFilter:o(function(e,r){return!0},"animateFilter"),ready:void 0,stop:void 0,transform:o(function(e,r){return r},"transform")};o(rge,"CircleLayout");rge.prototype.run=function(){var t=this.options,e=t,r=t.cy,n=e.eles,i=e.counterclockwise!==void 0?!e.counterclockwise:e.clockwise,a=n.nodes().not(":parent");e.sort&&(a=a.sort(e.sort));for(var s=Hs(e.boundingBox?e.boundingBox:{x1:0,y1:0,w:r.width(),h:r.height()}),l={x:s.x1+s.w/2,y:s.y1+s.h/2},u=e.sweep===void 0?2*Math.PI-2*Math.PI/a.length:e.sweep,h=u/Math.max(1,a.length-1),f,d=0,p=0;p1&&e.avoidOverlap){d*=1.75;var x=Math.cos(h)-Math.cos(0),b=Math.sin(h)-Math.sin(0),w=Math.sqrt(d*d/(x*x+b*b));f=Math.max(w,f)}var C=o(function(E,A){var S=e.startAngle+A*h*(i?1:-1),_=f*Math.cos(S),I=f*Math.sin(S),D={x:l.x+_,y:l.y+I};return D},"getPos");return n.nodes().layoutPositions(this,e,C),this};nQe={fit:!0,padding:30,startAngle:3/2*Math.PI,sweep:void 0,clockwise:!0,equidistant:!1,minNodeSpacing:10,boundingBox:void 0,avoidOverlap:!0,nodeDimensionsIncludeLabels:!1,height:void 0,width:void 0,spacingFactor:void 0,concentric:o(function(e){return e.degree()},"concentric"),levelWidth:o(function(e){return e.maxDegree()/4},"levelWidth"),animate:!1,animationDuration:500,animationEasing:void 0,animateFilter:o(function(e,r){return!0},"animateFilter"),ready:void 0,stop:void 0,transform:o(function(e,r){return r},"transform")};o(nge,"ConcentricLayout");nge.prototype.run=function(){for(var t=this.options,e=t,r=e.counterclockwise!==void 0?!e.counterclockwise:e.clockwise,n=t.cy,i=e.eles,a=i.nodes().not(":parent"),s=Hs(e.boundingBox?e.boundingBox:{x1:0,y1:0,w:n.width(),h:n.height()}),l={x:s.x1+s.w/2,y:s.y1+s.h/2},u=[],h=0,f=0;f0){var T=Math.abs(b[0].value-C.value);T>=v&&(b=[],x.push(b))}b.push(C)}var E=h+e.minNodeSpacing;if(!e.avoidOverlap){var A=x.length>0&&x[0].length>1,S=Math.min(s.w,s.h)/2-E,_=S/(x.length+A?1:0);E=Math.min(E,_)}for(var I=0,D=0;D1&&e.avoidOverlap){var O=Math.cos(R)-Math.cos(0),M=Math.sin(R)-Math.sin(0),B=Math.sqrt(E*E/(O*O+M*M));I=Math.max(B,I)}k.r=I,I+=E}if(e.equidistant){for(var F=0,P=0,z=0;z=t.numIter||(hQe(n,t),n.temperature=n.temperature*t.coolingFactor,n.temperature=t.animationThreshold&&a(),xS(d)}},"frame");f()}else{for(;h;)h=s(u),u++;E0e(n,t),l()}return this};HS.prototype.stop=function(){return this.stopped=!0,this.thread&&this.thread.stop(),this.emit("layoutstop"),this};HS.prototype.destroy=function(){return this.thread&&this.thread.stop(),this};aQe=o(function(e,r,n){for(var i=n.eles.edges(),a=n.eles.nodes(),s=Hs(n.boundingBox?n.boundingBox:{x1:0,y1:0,w:e.width(),h:e.height()}),l={isCompound:e.hasCompoundNodes(),layoutNodes:[],idToIndex:{},nodeSize:a.size(),graphSet:[],indexToGraph:[],layoutEdges:[],edgeSize:i.size(),temperature:n.initialTemp,clientWidth:s.w,clientHeight:s.h,boundingBox:s},u=n.eles.components(),h={},f=0;f0){l.graphSet.push(S);for(var f=0;fi.count?0:i.graph},"findLCA"),oQe=o(function t(e,r,n,i){var a=i.graphSet[n];if(-10)var d=i.nodeOverlap*f,p=Math.sqrt(l*l+u*u),m=d*l/p,g=d*u/p;else var y=CS(e,l,u),v=CS(r,-1*l,-1*u),x=v.x-y.x,b=v.y-y.y,w=x*x+b*b,p=Math.sqrt(w),d=(e.nodeRepulsion+r.nodeRepulsion)/w,m=d*x/p,g=d*b/p;e.isLocked||(e.offsetX-=m,e.offsetY-=g),r.isLocked||(r.offsetX+=m,r.offsetY+=g)}},"nodeRepulsion"),pQe=o(function(e,r,n,i){if(n>0)var a=e.maxX-r.minX;else var a=r.maxX-e.minX;if(i>0)var s=e.maxY-r.minY;else var s=r.maxY-e.minY;return a>=0&&s>=0?Math.sqrt(a*a+s*s):0},"nodesOverlap"),CS=o(function(e,r,n){var i=e.positionX,a=e.positionY,s=e.height||1,l=e.width||1,u=n/r,h=s/l,f={};return r===0&&0n?(f.x=i,f.y=a+s/2,f):0r&&-1*h<=u&&u<=h?(f.x=i-l/2,f.y=a-l*n/2/r,f):0=h)?(f.x=i+s*r/2/n,f.y=a+s/2,f):(0>n&&(u<=-1*h||u>=h)&&(f.x=i-s*r/2/n,f.y=a-s/2),f)},"findClippingPoint"),mQe=o(function(e,r){for(var n=0;nn){var v=r.gravity*m/y,x=r.gravity*g/y;p.offsetX+=v,p.offsetY+=x}}}}},"calculateGravityForces"),yQe=o(function(e,r){var n=[],i=0,a=-1;for(n.push.apply(n,e.graphSet[0]),a+=e.graphSet[0].length;i<=a;){var s=n[i++],l=e.idToIndex[s],u=e.layoutNodes[l],h=u.children;if(0n)var a={x:n*e/i,y:n*r/i};else var a={x:e,y:r};return a},"limitForce"),bQe=o(function t(e,r){var n=e.parentId;if(n!=null){var i=r.layoutNodes[r.idToIndex[n]],a=!1;if((i.maxX==null||e.maxX+i.padRight>i.maxX)&&(i.maxX=e.maxX+i.padRight,a=!0),(i.minX==null||e.minX-i.padLefti.maxY)&&(i.maxY=e.maxY+i.padBottom,a=!0),(i.minY==null||e.minY-i.padTopx&&(g+=v+r.componentSpacing,m=0,y=0,v=0)}}},"separateComponents"),wQe={fit:!0,padding:30,boundingBox:void 0,avoidOverlap:!0,avoidOverlapPadding:10,nodeDimensionsIncludeLabels:!1,spacingFactor:void 0,condense:!1,rows:void 0,cols:void 0,position:o(function(e){},"position"),sort:void 0,animate:!1,animationDuration:500,animationEasing:void 0,animateFilter:o(function(e,r){return!0},"animateFilter"),ready:void 0,stop:void 0,transform:o(function(e,r){return r},"transform")};o(age,"GridLayout");age.prototype.run=function(){var t=this.options,e=t,r=t.cy,n=e.eles,i=n.nodes().not(":parent");e.sort&&(i=i.sort(e.sort));var a=Hs(e.boundingBox?e.boundingBox:{x1:0,y1:0,w:r.width(),h:r.height()});if(a.h===0||a.w===0)n.nodes().layoutPositions(this,e,function(Q){return{x:a.x1,y:a.y1}});else{var s=i.size(),l=Math.sqrt(s*a.h/a.w),u=Math.round(l),h=Math.round(a.w/a.h*l),f=o(function(j){if(j==null)return Math.min(u,h);var ie=Math.min(u,h);ie==u?u=j:h=j},"small"),d=o(function(j){if(j==null)return Math.max(u,h);var ie=Math.max(u,h);ie==u?u=j:h=j},"large"),p=e.rows,m=e.cols!=null?e.cols:e.columns;if(p!=null&&m!=null)u=p,h=m;else if(p!=null&&m==null)u=p,h=Math.ceil(s/u);else if(p==null&&m!=null)h=m,u=Math.ceil(s/h);else if(h*u>s){var g=f(),y=d();(g-1)*y>=s?f(g-1):(y-1)*g>=s&&d(y-1)}else for(;h*u=s?d(x+1):f(v+1)}var b=a.w/h,w=a.h/u;if(e.condense&&(b=0,w=0),e.avoidOverlap)for(var C=0;C=h&&(O=0,R++)},"moveToNextCell"),B={},F=0;F(O=Wqe(t,e,M[B],M[B+1],M[B+2],M[B+3])))return v(A,O),!0}else if(_.edgeType==="bezier"||_.edgeType==="multibezier"||_.edgeType==="self"||_.edgeType==="compound"){for(var M=_.allpts,B=0;B+5<_.allpts.length;B+=4)if(Gqe(t,e,M[B],M[B+1],M[B+2],M[B+3],M[B+4],M[B+5],R)&&L>(O=Hqe(t,e,M[B],M[B+1],M[B+2],M[B+3],M[B+4],M[B+5])))return v(A,O),!0}for(var F=F||S.source,P=P||S.target,z=i.getArrowWidth(I,D),$=[{name:"source",x:_.arrowStartX,y:_.arrowStartY,angle:_.srcArrowAngle},{name:"target",x:_.arrowEndX,y:_.arrowEndY,angle:_.tgtArrowAngle},{name:"mid-source",x:_.midX,y:_.midY,angle:_.midsrcArrowAngle},{name:"mid-target",x:_.midX,y:_.midY,angle:_.midtgtArrowAngle}],B=0;B<$.length;B++){var H=$[B],Q=a.arrowShapes[A.pstyle(H.name+"-arrow-shape").value],j=A.pstyle("width").pfValue;if(Q.roughCollide(t,e,z,H.angle,{x:H.x,y:H.y},j,f)&&Q.collide(t,e,z,H.angle,{x:H.x,y:H.y},j,f))return v(A),!0}h&&l.length>0&&(x(F),x(P))}o(b,"checkEdge");function w(A,S,_){return Gl(A,S,_)}o(w,"preprop");function C(A,S){var _=A._private,I=p,D;S?D=S+"-":D="",A.boundingBox();var k=_.labelBounds[S||"main"],L=A.pstyle(D+"label").value,R=A.pstyle("text-events").strValue==="yes";if(!(!R||!L)){var O=w(_.rscratch,"labelX",S),M=w(_.rscratch,"labelY",S),B=w(_.rscratch,"labelAngle",S),F=A.pstyle(D+"text-margin-x").pfValue,P=A.pstyle(D+"text-margin-y").pfValue,z=k.x1-I-F,$=k.x2+I-F,H=k.y1-I-P,Q=k.y2+I-P;if(B){var j=Math.cos(B),ie=Math.sin(B),ne=o(function(se,ue){return se=se-O,ue=ue-M,{x:se*j-ue*ie+O,y:se*ie+ue*j+M}},"rotate"),le=ne(z,H),he=ne(z,Q),K=ne($,H),X=ne($,Q),te=[le.x+F,le.y+P,K.x+F,K.y+P,X.x+F,X.y+P,he.x+F,he.y+P];if(Us(t,e,te))return v(A),!0}else if(K1(k,t,e))return v(A),!0}}o(C,"checkLabel");for(var T=s.length-1;T>=0;T--){var E=s[T];E.isNode()?x(E)||C(E):b(E)||C(E)||C(E,"source")||C(E,"target")}return l};qp.getAllInBox=function(t,e,r,n){var i=this.getCachedZSortedEles().interactive,a=[],s=Math.min(t,r),l=Math.max(t,r),u=Math.min(e,n),h=Math.max(e,n);t=s,r=l,e=u,n=h;for(var f=Hs({x1:t,y1:e,x2:r,y2:n}),d=0;d0?-(Math.PI-e.ang):Math.PI+e.ang},"invertVec"),AQe=o(function(e,r,n,i,a){if(e!==D0e?L0e(r,e,qc):CQe(Jo,qc),L0e(r,n,Jo),A0e=qc.nx*Jo.ny-qc.ny*Jo.nx,_0e=qc.nx*Jo.nx-qc.ny*-Jo.ny,Ku=Math.asin(Math.max(-1,Math.min(1,A0e))),Math.abs(Ku)<1e-6){HP=r.x,WP=r.y,Bp=G1=0;return}Fp=1,gS=!1,_0e<0?Ku<0?Ku=Math.PI+Ku:(Ku=Math.PI-Ku,Fp=-1,gS=!0):Ku>0&&(Fp=-1,gS=!0),r.radius!==void 0?G1=r.radius:G1=i,Mp=Ku/2,aS=Math.min(qc.len/2,Jo.len/2),a?(Wc=Math.abs(Math.cos(Mp)*G1/Math.sin(Mp)),Wc>aS?(Wc=aS,Bp=Math.abs(Wc*Math.sin(Mp)/Math.cos(Mp))):Bp=G1):(Wc=Math.min(aS,G1),Bp=Math.abs(Wc*Math.sin(Mp)/Math.cos(Mp))),qP=r.x+Jo.nx*Wc,YP=r.y+Jo.ny*Wc,HP=qP-Jo.ny*Bp*Fp,WP=YP+Jo.nx*Bp*Fp,cge=r.x+qc.nx*Wc,uge=r.y+qc.ny*Wc,D0e=r},"calcCornerArc");o(hge,"drawPreparedRoundCorner");o(vB,"getRoundCorner");Va={};Va.findMidptPtsEtc=function(t,e){var r=e.posPts,n=e.intersectionPts,i=e.vectorNormInverse,a,s=t.pstyle("source-endpoint"),l=t.pstyle("target-endpoint"),u=s.units!=null&&l.units!=null,h=o(function(T,E,A,S){var _=S-E,I=A-T,D=Math.sqrt(I*I+_*_);return{x:-_/D,y:I/D}},"recalcVectorNormInverse"),f=t.pstyle("edge-distances").value;switch(f){case"node-position":a=r;break;case"intersection":a=n;break;case"endpoints":{if(u){var d=this.manualEndptToPx(t.source()[0],s),p=_i(d,2),m=p[0],g=p[1],y=this.manualEndptToPx(t.target()[0],l),v=_i(y,2),x=v[0],b=v[1],w={x1:m,y1:g,x2:x,y2:b};i=h(m,g,x,b),a=w}else un("Edge ".concat(t.id()," has edge-distances:endpoints specified without manual endpoints specified via source-endpoint and target-endpoint. Falling back on edge-distances:intersection (default).")),a=n;break}}return{midptPts:a,vectorNormInverse:i}};Va.findHaystackPoints=function(t){for(var e=0;e0?Math.max(q-pe,0):Math.min(q+pe,0)},"subDWH"),L=k(I,S),R=k(D,_),O=!1;b===h?x=Math.abs(L)>Math.abs(R)?i:n:b===u||b===l?(x=n,O=!0):(b===a||b===s)&&(x=i,O=!0);var M=x===n,B=M?R:L,F=M?D:I,P=mme(F),z=!1;!(O&&(C||E))&&(b===l&&F<0||b===u&&F>0||b===a&&F>0||b===s&&F<0)&&(P*=-1,B=P*Math.abs(B),z=!0);var $;if(C){var H=T<0?1+T:T;$=H*B}else{var Q=T<0?B:0;$=Q+T*P}var j=o(function(q){return Math.abs(q)=Math.abs(B)},"getIsTooClose"),ie=j($),ne=j(Math.abs(B)-Math.abs($)),le=ie||ne;if(le&&!z)if(M){var he=Math.abs(F)<=p/2,K=Math.abs(I)<=m/2;if(he){var X=(f.x1+f.x2)/2,te=f.y1,J=f.y2;r.segpts=[X,te,X,J]}else if(K){var se=(f.y1+f.y2)/2,ue=f.x1,Z=f.x2;r.segpts=[ue,se,Z,se]}else r.segpts=[f.x1,f.y2]}else{var Se=Math.abs(F)<=d/2,ce=Math.abs(D)<=g/2;if(Se){var ae=(f.y1+f.y2)/2,Oe=f.x1,ge=f.x2;r.segpts=[Oe,ae,ge,ae]}else if(ce){var ze=(f.x1+f.x2)/2,He=f.y1,$e=f.y2;r.segpts=[ze,He,ze,$e]}else r.segpts=[f.x2,f.y1]}else if(M){var Re=f.y1+$+(v?p/2*P:0),Ie=f.x1,be=f.x2;r.segpts=[Ie,Re,be,Re]}else{var W=f.x1+$+(v?d/2*P:0),de=f.y1,re=f.y2;r.segpts=[W,de,W,re]}if(r.isRound){var oe=t.pstyle("taxi-radius").value,V=t.pstyle("radius-type").value[0]==="arc-radius";r.radii=new Array(r.segpts.length/2).fill(oe),r.isArcRadius=new Array(r.segpts.length/2).fill(V)}};Va.tryToCorrectInvalidPoints=function(t,e){var r=t._private.rscratch;if(r.edgeType==="bezier"){var n=e.srcPos,i=e.tgtPos,a=e.srcW,s=e.srcH,l=e.tgtW,u=e.tgtH,h=e.srcShape,f=e.tgtShape,d=e.srcCornerRadius,p=e.tgtCornerRadius,m=e.srcRs,g=e.tgtRs,y=!Ct(r.startX)||!Ct(r.startY),v=!Ct(r.arrowStartX)||!Ct(r.arrowStartY),x=!Ct(r.endX)||!Ct(r.endY),b=!Ct(r.arrowEndX)||!Ct(r.arrowEndY),w=3,C=this.getArrowWidth(t.pstyle("width").pfValue,t.pstyle("arrow-scale").value)*this.arrowShapeWidth,T=w*C,E=Gp({x:r.ctrlpts[0],y:r.ctrlpts[1]},{x:r.startX,y:r.startY}),A=ER.poolIndex()){var O=L;L=R,R=O}var M=_.srcPos=L.position(),B=_.tgtPos=R.position(),F=_.srcW=L.outerWidth(),P=_.srcH=L.outerHeight(),z=_.tgtW=R.outerWidth(),$=_.tgtH=R.outerHeight(),H=_.srcShape=r.nodeShapes[e.getNodeShape(L)],Q=_.tgtShape=r.nodeShapes[e.getNodeShape(R)],j=_.srcCornerRadius=L.pstyle("corner-radius").value==="auto"?"auto":L.pstyle("corner-radius").pfValue,ie=_.tgtCornerRadius=R.pstyle("corner-radius").value==="auto"?"auto":R.pstyle("corner-radius").pfValue,ne=_.tgtRs=R._private.rscratch,le=_.srcRs=L._private.rscratch;_.dirCounts={north:0,west:0,south:0,east:0,northwest:0,southwest:0,northeast:0,southeast:0};for(var he=0;he<_.eles.length;he++){var K=_.eles[he],X=K[0]._private.rscratch,te=K.pstyle("curve-style").value,J=te==="unbundled-bezier"||te.endsWith("segments")||te.endsWith("taxi"),se=!L.same(K.source());if(!_.calculatedIntersection&&L!==R&&(_.hasBezier||_.hasUnbundled)){_.calculatedIntersection=!0;var ue=H.intersectLine(M.x,M.y,F,P,B.x,B.y,0,j,le),Z=_.srcIntn=ue,Se=Q.intersectLine(B.x,B.y,z,$,M.x,M.y,0,ie,ne),ce=_.tgtIntn=Se,ae=_.intersectionPts={x1:ue[0],x2:Se[0],y1:ue[1],y2:Se[1]},Oe=_.posPts={x1:M.x,x2:B.x,y1:M.y,y2:B.y},ge=Se[1]-ue[1],ze=Se[0]-ue[0],He=Math.sqrt(ze*ze+ge*ge),$e=_.vector={x:ze,y:ge},Re=_.vectorNorm={x:$e.x/He,y:$e.y/He},Ie={x:-Re.y,y:Re.x};_.nodesOverlap=!Ct(He)||Q.checkPoint(ue[0],ue[1],0,z,$,B.x,B.y,ie,ne)||H.checkPoint(Se[0],Se[1],0,F,P,M.x,M.y,j,le),_.vectorNormInverse=Ie,I={nodesOverlap:_.nodesOverlap,dirCounts:_.dirCounts,calculatedIntersection:!0,hasBezier:_.hasBezier,hasUnbundled:_.hasUnbundled,eles:_.eles,srcPos:B,srcRs:ne,tgtPos:M,tgtRs:le,srcW:z,srcH:$,tgtW:F,tgtH:P,srcIntn:ce,tgtIntn:Z,srcShape:Q,tgtShape:H,posPts:{x1:Oe.x2,y1:Oe.y2,x2:Oe.x1,y2:Oe.y1},intersectionPts:{x1:ae.x2,y1:ae.y2,x2:ae.x1,y2:ae.y1},vector:{x:-$e.x,y:-$e.y},vectorNorm:{x:-Re.x,y:-Re.y},vectorNormInverse:{x:-Ie.x,y:-Ie.y}}}var be=se?I:_;X.nodesOverlap=be.nodesOverlap,X.srcIntn=be.srcIntn,X.tgtIntn=be.tgtIntn,X.isRound=te.startsWith("round"),i&&(L.isParent()||L.isChild()||R.isParent()||R.isChild())&&(L.parents().anySame(R)||R.parents().anySame(L)||L.same(R)&&L.isParent())?e.findCompoundLoopPoints(K,be,he,J):L===R?e.findLoopPoints(K,be,he,J):te.endsWith("segments")?e.findSegmentsPoints(K,be):te.endsWith("taxi")?e.findTaxiPoints(K,be):te==="straight"||!J&&_.eles.length%2===1&&he===Math.floor(_.eles.length/2)?e.findStraightEdgePoints(K):e.findBezierPoints(K,be,he,J,se),e.findEndpoints(K),e.tryToCorrectInvalidPoints(K,be),e.checkForInvalidEdgeWarning(K),e.storeAllpts(K),e.storeEdgeProjections(K),e.calculateArrowAngles(K),e.recalculateEdgeLabelProjections(K),e.calculateLabelAngles(K)}},"_loop"),T=0;T0){var J=a,se=Op(J,U1(r)),ue=Op(J,U1(te)),Z=se;if(ue2){var Se=Op(J,{x:te[2],y:te[3]});Se0){var re=s,oe=Op(re,U1(r)),V=Op(re,U1(de)),xe=oe;if(V2){var q=Op(re,{x:de[2],y:de[3]});q=g||A){v={cp:C,segment:E};break}}if(v)break}var S=v.cp,_=v.segment,I=(g-x)/_.length,D=_.t1-_.t0,k=m?_.t0+D*I:_.t1-D*I;k=Yb(0,k,1),e=W1(S.p0,S.p1,S.p2,k),p=DQe(S.p0,S.p1,S.p2,k);break}case"straight":case"segments":case"haystack":{for(var L=0,R,O,M,B,F=n.allpts.length,P=0;P+3=g));P+=2);var z=g-O,$=z/R;$=Yb(0,$,1),e=Iqe(M,B,$),p=pge(M,B);break}}s("labelX",d,e.x),s("labelY",d,e.y),s("labelAutoAngle",d,p)}},"calculateEndProjection");h("source"),h("target"),this.applyLabelDimensions(t)}};Kc.applyLabelDimensions=function(t){this.applyPrefixedLabelDimensions(t),t.isEdge()&&(this.applyPrefixedLabelDimensions(t,"source"),this.applyPrefixedLabelDimensions(t,"target"))};Kc.applyPrefixedLabelDimensions=function(t,e){var r=t._private,n=this.getLabelText(t,e),i=this.calculateLabelDimensions(t,n),a=t.pstyle("line-height").pfValue,s=t.pstyle("text-wrap").strValue,l=Gl(r.rscratch,"labelWrapCachedLines",e)||[],u=s!=="wrap"?1:Math.max(l.length,1),h=i.height/u,f=h*a,d=i.width,p=i.height+(u-1)*(a-1)*h;kf(r.rstyle,"labelWidth",e,d),kf(r.rscratch,"labelWidth",e,d),kf(r.rstyle,"labelHeight",e,p),kf(r.rscratch,"labelHeight",e,p),kf(r.rscratch,"labelLineHeight",e,f)};Kc.getLabelText=function(t,e){var r=t._private,n=e?e+"-":"",i=t.pstyle(n+"label").strValue,a=t.pstyle("text-transform").value,s=o(function(Q,j){return j?(kf(r.rscratch,Q,e,j),j):Gl(r.rscratch,Q,e)},"rscratch");if(!i)return"";a=="none"||(a=="uppercase"?i=i.toUpperCase():a=="lowercase"&&(i=i.toLowerCase()));var l=t.pstyle("text-wrap").value;if(l==="wrap"){var u=s("labelKey");if(u!=null&&s("labelWrapKey")===u)return s("labelWrapCachedText");for(var h="\u200B",f=i.split(` -`),d=t.pstyle("text-max-width").pfValue,p=t.pstyle("text-overflow-wrap").value,m=p==="anywhere",g=[],y=/[\s\u200b]+|$/g,v=0;vd){var T=x.matchAll(y),E="",A=0,S=mo(T),_;try{for(S.s();!(_=S.n()).done;){var I=_.value,D=I[0],k=x.substring(A,I.index);A=I.index+D.length;var L=E.length===0?k:E+k+D,R=this.calculateLabelDimensions(t,L),O=R.width;O<=d?E+=k+D:(E&&g.push(E),E=k+D)}}catch(H){S.e(H)}finally{S.f()}E.match(/^[\s\u200b]+$/)||g.push(E)}else g.push(x)}s("labelWrapCachedLines",g),i=s("labelWrapCachedText",g.join(` -`)),s("labelWrapKey",u)}else if(l==="ellipsis"){var M=t.pstyle("text-max-width").pfValue,B="",F="\u2026",P=!1;if(this.calculateLabelDimensions(t,i).widthM)break;B+=i[z],z===i.length-1&&(P=!0)}return P||(B+=F),B}return i};Kc.getLabelJustification=function(t){var e=t.pstyle("text-justification").strValue,r=t.pstyle("text-halign").strValue;if(e==="auto")if(t.isNode())switch(r){case"left":return"right";case"right":return"left";default:return"center"}else return"center";else return e};Kc.calculateLabelDimensions=function(t,e){var r=this,n=r.cy.window(),i=n.document,a=_f(e,t._private.labelDimsKey),s=r.labelDimCache||(r.labelDimCache=[]),l=s[a];if(l!=null)return l;var u=0,h=t.pstyle("font-style").strValue,f=t.pstyle("font-size").pfValue,d=t.pstyle("font-family").strValue,p=t.pstyle("font-weight").strValue,m=this.labelCalcCanvas,g=this.labelCalcCanvasContext;if(!m){m=this.labelCalcCanvas=i.createElement("canvas"),g=this.labelCalcCanvasContext=m.getContext("2d");var y=m.style;y.position="absolute",y.left="-9999px",y.top="-9999px",y.zIndex="-1",y.visibility="hidden",y.pointerEvents="none"}g.font="".concat(h," ").concat(p," ").concat(f,"px ").concat(d);for(var v=0,x=0,b=e.split(` -`),w=0;w1&&arguments[1]!==void 0?arguments[1]:!0;if(e.merge(s),l)for(var u=0;u=t.desktopTapThreshold2}var ot=a(W);at&&(t.hoverData.tapholdCancelled=!0);var Yt=o(function(){var Tt=t.hoverData.dragDelta=t.hoverData.dragDelta||[];Tt.length===0?(Tt.push(De[0]),Tt.push(De[1])):(Tt[0]+=De[0],Tt[1]+=De[1])},"updateDragDelta");re=!0,i(_e,["mousemove","vmousemove","tapdrag"],W,{x:q[0],y:q[1]});var bt=o(function(){t.data.bgActivePosistion=void 0,t.hoverData.selecting||oe.emit({originalEvent:W,type:"boxstart",position:{x:q[0],y:q[1]}}),Pe[4]=1,t.hoverData.selecting=!0,t.redrawHint("select",!0),t.redraw()},"goIntoBoxMode");if(t.hoverData.which===3){if(at){var Mt={originalEvent:W,type:"cxtdrag",position:{x:q[0],y:q[1]}};Ve?Ve.emit(Mt):oe.emit(Mt),t.hoverData.cxtDragged=!0,(!t.hoverData.cxtOver||_e!==t.hoverData.cxtOver)&&(t.hoverData.cxtOver&&t.hoverData.cxtOver.emit({originalEvent:W,type:"cxtdragout",position:{x:q[0],y:q[1]}}),t.hoverData.cxtOver=_e,_e&&_e.emit({originalEvent:W,type:"cxtdragover",position:{x:q[0],y:q[1]}}))}}else if(t.hoverData.dragging){if(re=!0,oe.panningEnabled()&&oe.userPanningEnabled()){var xt;if(t.hoverData.justStartedPan){var ut=t.hoverData.mdownPos;xt={x:(q[0]-ut[0])*V,y:(q[1]-ut[1])*V},t.hoverData.justStartedPan=!1}else xt={x:De[0]*V,y:De[1]*V};oe.panBy(xt),oe.emit("dragpan"),t.hoverData.dragged=!0}q=t.projectIntoViewport(W.clientX,W.clientY)}else if(Pe[4]==1&&(Ve==null||Ve.pannable())){if(at){if(!t.hoverData.dragging&&oe.boxSelectionEnabled()&&(ot||!oe.panningEnabled()||!oe.userPanningEnabled()))bt();else if(!t.hoverData.selecting&&oe.panningEnabled()&&oe.userPanningEnabled()){var Et=s(Ve,t.hoverData.downs);Et&&(t.hoverData.dragging=!0,t.hoverData.justStartedPan=!0,Pe[4]=0,t.data.bgActivePosistion=U1(pe),t.redrawHint("select",!0),t.redraw())}Ve&&Ve.pannable()&&Ve.active()&&Ve.unactivate()}}else{if(Ve&&Ve.pannable()&&Ve.active()&&Ve.unactivate(),(!Ve||!Ve.grabbed())&&_e!=we&&(we&&i(we,["mouseout","tapdragout"],W,{x:q[0],y:q[1]}),_e&&i(_e,["mouseover","tapdragover"],W,{x:q[0],y:q[1]}),t.hoverData.last=_e),Ve)if(at){if(oe.boxSelectionEnabled()&&ot)Ve&&Ve.grabbed()&&(x(qe),Ve.emit("freeon"),qe.emit("free"),t.dragData.didDrag&&(Ve.emit("dragfreeon"),qe.emit("dragfree"))),bt();else if(Ve&&Ve.grabbed()&&t.nodeIsDraggable(Ve)){var ft=!t.dragData.didDrag;ft&&t.redrawHint("eles",!0),t.dragData.didDrag=!0,t.hoverData.draggingEles||y(qe,{inDragLayer:!0});var yt={x:0,y:0};if(Ct(De[0])&&Ct(De[1])&&(yt.x+=De[0],yt.y+=De[1],ft)){var nt=t.hoverData.dragDelta;nt&&Ct(nt[0])&&Ct(nt[1])&&(yt.x+=nt[0],yt.y+=nt[1])}t.hoverData.draggingEles=!0,qe.silentShift(yt).emit("position drag"),t.redrawHint("drag",!0),t.redraw()}}else Yt();re=!0}if(Pe[2]=q[0],Pe[3]=q[1],re)return W.stopPropagation&&W.stopPropagation(),W.preventDefault&&W.preventDefault(),!1}},"mousemoveHandler"),!1);var k,L,R;t.registerBinding(e,"mouseup",o(function(W){if(!(t.hoverData.which===1&&W.which!==1&&t.hoverData.capture)){var de=t.hoverData.capture;if(de){t.hoverData.capture=!1;var re=t.cy,oe=t.projectIntoViewport(W.clientX,W.clientY),V=t.selection,xe=t.findNearestElement(oe[0],oe[1],!0,!1),q=t.dragData.possibleDragElements,pe=t.hoverData.down,ve=a(W);if(t.data.bgActivePosistion&&(t.redrawHint("select",!0),t.redraw()),t.hoverData.tapholdCancelled=!0,t.data.bgActivePosistion=void 0,pe&&pe.unactivate(),t.hoverData.which===3){var Pe={originalEvent:W,type:"cxttapend",position:{x:oe[0],y:oe[1]}};if(pe?pe.emit(Pe):re.emit(Pe),!t.hoverData.cxtDragged){var _e={originalEvent:W,type:"cxttap",position:{x:oe[0],y:oe[1]}};pe?pe.emit(_e):re.emit(_e)}t.hoverData.cxtDragged=!1,t.hoverData.which=null}else if(t.hoverData.which===1){if(i(xe,["mouseup","tapend","vmouseup"],W,{x:oe[0],y:oe[1]}),!t.dragData.didDrag&&!t.hoverData.dragged&&!t.hoverData.selecting&&!t.hoverData.isOverThresholdDrag&&(i(pe,["click","tap","vclick"],W,{x:oe[0],y:oe[1]}),L=!1,W.timeStamp-R<=re.multiClickDebounceTime()?(k&&clearTimeout(k),L=!0,R=null,i(pe,["dblclick","dbltap","vdblclick"],W,{x:oe[0],y:oe[1]})):(k=setTimeout(function(){L||i(pe,["oneclick","onetap","voneclick"],W,{x:oe[0],y:oe[1]})},re.multiClickDebounceTime()),R=W.timeStamp)),pe==null&&!t.dragData.didDrag&&!t.hoverData.selecting&&!t.hoverData.dragged&&!a(W)&&(re.$(r).unselect(["tapunselect"]),q.length>0&&t.redrawHint("eles",!0),t.dragData.possibleDragElements=q=re.collection()),xe==pe&&!t.dragData.didDrag&&!t.hoverData.selecting&&xe!=null&&xe._private.selectable&&(t.hoverData.dragging||(re.selectionType()==="additive"||ve?xe.selected()?xe.unselect(["tapunselect"]):xe.select(["tapselect"]):ve||(re.$(r).unmerge(xe).unselect(["tapunselect"]),xe.select(["tapselect"]))),t.redrawHint("eles",!0)),t.hoverData.selecting){var we=re.collection(t.getAllInBox(V[0],V[1],V[2],V[3]));t.redrawHint("select",!0),we.length>0&&t.redrawHint("eles",!0),re.emit({type:"boxend",originalEvent:W,position:{x:oe[0],y:oe[1]}});var Ve=o(function(at){return at.selectable()&&!at.selected()},"eleWouldBeSelected");re.selectionType()==="additive"||ve||re.$(r).unmerge(we).unselect(),we.emit("box").stdFilter(Ve).select().emit("boxselect"),t.redraw()}if(t.hoverData.dragging&&(t.hoverData.dragging=!1,t.redrawHint("select",!0),t.redrawHint("eles",!0),t.redraw()),!V[4]){t.redrawHint("drag",!0),t.redrawHint("eles",!0);var De=pe&&pe.grabbed();x(q),De&&(pe.emit("freeon"),q.emit("free"),t.dragData.didDrag&&(pe.emit("dragfreeon"),q.emit("dragfree")))}}V[4]=0,t.hoverData.down=null,t.hoverData.cxtStarted=!1,t.hoverData.draggingEles=!1,t.hoverData.selecting=!1,t.hoverData.isOverThresholdDrag=!1,t.dragData.didDrag=!1,t.hoverData.dragged=!1,t.hoverData.dragDelta=[],t.hoverData.mdownPos=null,t.hoverData.mdownGPos=null,t.hoverData.which=null}}},"mouseupHandler"),!1);var O=o(function(W){if(!t.scrollingPage){var de=t.cy,re=de.zoom(),oe=de.pan(),V=t.projectIntoViewport(W.clientX,W.clientY),xe=[V[0]*re+oe.x,V[1]*re+oe.y];if(t.hoverData.draggingEles||t.hoverData.dragging||t.hoverData.cxtStarted||_()){W.preventDefault();return}if(de.panningEnabled()&&de.userPanningEnabled()&&de.zoomingEnabled()&&de.userZoomingEnabled()){W.preventDefault(),t.data.wheelZooming=!0,clearTimeout(t.data.wheelTimeout),t.data.wheelTimeout=setTimeout(function(){t.data.wheelZooming=!1,t.redrawHint("eles",!0),t.redraw()},150);var q;W.deltaY!=null?q=W.deltaY/-250:W.wheelDeltaY!=null?q=W.wheelDeltaY/1e3:q=W.wheelDelta/1e3,q=q*t.wheelSensitivity;var pe=W.deltaMode===1;pe&&(q*=33);var ve=de.zoom()*Math.pow(10,q);W.type==="gesturechange"&&(ve=t.gestureStartZoom*W.scale),de.zoom({level:ve,renderedPosition:{x:xe[0],y:xe[1]}}),de.emit(W.type==="gesturechange"?"pinchzoom":"scrollzoom")}}},"wheelHandler");t.registerBinding(t.container,"wheel",O,!0),t.registerBinding(e,"scroll",o(function(W){t.scrollingPage=!0,clearTimeout(t.scrollingPageTimeout),t.scrollingPageTimeout=setTimeout(function(){t.scrollingPage=!1},250)},"scrollHandler"),!0),t.registerBinding(t.container,"gesturestart",o(function(W){t.gestureStartZoom=t.cy.zoom(),t.hasTouchStarted||W.preventDefault()},"gestureStartHandler"),!0),t.registerBinding(t.container,"gesturechange",function(be){t.hasTouchStarted||O(be)},!0),t.registerBinding(t.container,"mouseout",o(function(W){var de=t.projectIntoViewport(W.clientX,W.clientY);t.cy.emit({originalEvent:W,type:"mouseout",position:{x:de[0],y:de[1]}})},"mouseOutHandler"),!1),t.registerBinding(t.container,"mouseover",o(function(W){var de=t.projectIntoViewport(W.clientX,W.clientY);t.cy.emit({originalEvent:W,type:"mouseover",position:{x:de[0],y:de[1]}})},"mouseOverHandler"),!1);var M,B,F,P,z,$,H,Q,j,ie,ne,le,he,K=o(function(W,de,re,oe){return Math.sqrt((re-W)*(re-W)+(oe-de)*(oe-de))},"distance"),X=o(function(W,de,re,oe){return(re-W)*(re-W)+(oe-de)*(oe-de)},"distanceSq"),te;t.registerBinding(t.container,"touchstart",te=o(function(W){if(t.hasTouchStarted=!0,!!I(W)){w(),t.touchData.capture=!0,t.data.bgActivePosistion=void 0;var de=t.cy,re=t.touchData.now,oe=t.touchData.earlier;if(W.touches[0]){var V=t.projectIntoViewport(W.touches[0].clientX,W.touches[0].clientY);re[0]=V[0],re[1]=V[1]}if(W.touches[1]){var V=t.projectIntoViewport(W.touches[1].clientX,W.touches[1].clientY);re[2]=V[0],re[3]=V[1]}if(W.touches[2]){var V=t.projectIntoViewport(W.touches[2].clientX,W.touches[2].clientY);re[4]=V[0],re[5]=V[1]}if(W.touches[1]){t.touchData.singleTouchMoved=!0,x(t.dragData.touchDragEles);var xe=t.findContainerClientCoords();j=xe[0],ie=xe[1],ne=xe[2],le=xe[3],M=W.touches[0].clientX-j,B=W.touches[0].clientY-ie,F=W.touches[1].clientX-j,P=W.touches[1].clientY-ie,he=0<=M&&M<=ne&&0<=F&&F<=ne&&0<=B&&B<=le&&0<=P&&P<=le;var q=de.pan(),pe=de.zoom();z=K(M,B,F,P),$=X(M,B,F,P),H=[(M+F)/2,(B+P)/2],Q=[(H[0]-q.x)/pe,(H[1]-q.y)/pe];var ve=200,Pe=ve*ve;if($=1){for(var st=t.touchData.startPosition=[null,null,null,null,null,null],Ue=0;Ue=t.touchTapThreshold2}if(de&&t.touchData.cxt){W.preventDefault();var st=W.touches[0].clientX-j,Ue=W.touches[0].clientY-ie,ct=W.touches[1].clientX-j,We=W.touches[1].clientY-ie,ot=X(st,Ue,ct,We),Yt=ot/$,bt=150,Mt=bt*bt,xt=1.5,ut=xt*xt;if(Yt>=ut||ot>=Mt){t.touchData.cxt=!1,t.data.bgActivePosistion=void 0,t.redrawHint("select",!0);var Et={originalEvent:W,type:"cxttapend",position:{x:V[0],y:V[1]}};t.touchData.start?(t.touchData.start.unactivate().emit(Et),t.touchData.start=null):oe.emit(Et)}}if(de&&t.touchData.cxt){var Et={originalEvent:W,type:"cxtdrag",position:{x:V[0],y:V[1]}};t.data.bgActivePosistion=void 0,t.redrawHint("select",!0),t.touchData.start?t.touchData.start.emit(Et):oe.emit(Et),t.touchData.start&&(t.touchData.start._private.grabbed=!1),t.touchData.cxtDragged=!0;var ft=t.findNearestElement(V[0],V[1],!0,!0);(!t.touchData.cxtOver||ft!==t.touchData.cxtOver)&&(t.touchData.cxtOver&&t.touchData.cxtOver.emit({originalEvent:W,type:"cxtdragout",position:{x:V[0],y:V[1]}}),t.touchData.cxtOver=ft,ft&&ft.emit({originalEvent:W,type:"cxtdragover",position:{x:V[0],y:V[1]}}))}else if(de&&W.touches[2]&&oe.boxSelectionEnabled())W.preventDefault(),t.data.bgActivePosistion=void 0,this.lastThreeTouch=+new Date,t.touchData.selecting||oe.emit({originalEvent:W,type:"boxstart",position:{x:V[0],y:V[1]}}),t.touchData.selecting=!0,t.touchData.didSelect=!0,re[4]=1,!re||re.length===0||re[0]===void 0?(re[0]=(V[0]+V[2]+V[4])/3,re[1]=(V[1]+V[3]+V[5])/3,re[2]=(V[0]+V[2]+V[4])/3+1,re[3]=(V[1]+V[3]+V[5])/3+1):(re[2]=(V[0]+V[2]+V[4])/3,re[3]=(V[1]+V[3]+V[5])/3),t.redrawHint("select",!0),t.redraw();else if(de&&W.touches[1]&&!t.touchData.didSelect&&oe.zoomingEnabled()&&oe.panningEnabled()&&oe.userZoomingEnabled()&&oe.userPanningEnabled()){W.preventDefault(),t.data.bgActivePosistion=void 0,t.redrawHint("select",!0);var yt=t.dragData.touchDragEles;if(yt){t.redrawHint("drag",!0);for(var nt=0;nt0&&!t.hoverData.draggingEles&&!t.swipePanning&&t.data.bgActivePosistion!=null&&(t.data.bgActivePosistion=void 0,t.redrawHint("select",!0),t.redraw())}},"touchmoveHandler"),!1);var se;t.registerBinding(e,"touchcancel",se=o(function(W){var de=t.touchData.start;t.touchData.capture=!1,de&&de.unactivate()},"touchcancelHandler"));var ue,Z,Se,ce;if(t.registerBinding(e,"touchend",ue=o(function(W){var de=t.touchData.start,re=t.touchData.capture;if(re)W.touches.length===0&&(t.touchData.capture=!1),W.preventDefault();else return;var oe=t.selection;t.swipePanning=!1,t.hoverData.draggingEles=!1;var V=t.cy,xe=V.zoom(),q=t.touchData.now,pe=t.touchData.earlier;if(W.touches[0]){var ve=t.projectIntoViewport(W.touches[0].clientX,W.touches[0].clientY);q[0]=ve[0],q[1]=ve[1]}if(W.touches[1]){var ve=t.projectIntoViewport(W.touches[1].clientX,W.touches[1].clientY);q[2]=ve[0],q[3]=ve[1]}if(W.touches[2]){var ve=t.projectIntoViewport(W.touches[2].clientX,W.touches[2].clientY);q[4]=ve[0],q[5]=ve[1]}de&&de.unactivate();var Pe;if(t.touchData.cxt){if(Pe={originalEvent:W,type:"cxttapend",position:{x:q[0],y:q[1]}},de?de.emit(Pe):V.emit(Pe),!t.touchData.cxtDragged){var _e={originalEvent:W,type:"cxttap",position:{x:q[0],y:q[1]}};de?de.emit(_e):V.emit(_e)}t.touchData.start&&(t.touchData.start._private.grabbed=!1),t.touchData.cxt=!1,t.touchData.start=null,t.redraw();return}if(!W.touches[2]&&V.boxSelectionEnabled()&&t.touchData.selecting){t.touchData.selecting=!1;var we=V.collection(t.getAllInBox(oe[0],oe[1],oe[2],oe[3]));oe[0]=void 0,oe[1]=void 0,oe[2]=void 0,oe[3]=void 0,oe[4]=0,t.redrawHint("select",!0),V.emit({type:"boxend",originalEvent:W,position:{x:q[0],y:q[1]}});var Ve=o(function(Mt){return Mt.selectable()&&!Mt.selected()},"eleWouldBeSelected");we.emit("box").stdFilter(Ve).select().emit("boxselect"),we.nonempty()&&t.redrawHint("eles",!0),t.redraw()}if(de?.unactivate(),W.touches[2])t.data.bgActivePosistion=void 0,t.redrawHint("select",!0);else if(!W.touches[1]){if(!W.touches[0]){if(!W.touches[0]){t.data.bgActivePosistion=void 0,t.redrawHint("select",!0);var De=t.dragData.touchDragEles;if(de!=null){var qe=de._private.grabbed;x(De),t.redrawHint("drag",!0),t.redrawHint("eles",!0),qe&&(de.emit("freeon"),De.emit("free"),t.dragData.didDrag&&(de.emit("dragfreeon"),De.emit("dragfree"))),i(de,["touchend","tapend","vmouseup","tapdragout"],W,{x:q[0],y:q[1]}),de.unactivate(),t.touchData.start=null}else{var at=t.findNearestElement(q[0],q[1],!0,!0);i(at,["touchend","tapend","vmouseup","tapdragout"],W,{x:q[0],y:q[1]})}var Rt=t.touchData.startPosition[0]-q[0],st=Rt*Rt,Ue=t.touchData.startPosition[1]-q[1],ct=Ue*Ue,We=st+ct,ot=We*xe*xe;t.touchData.singleTouchMoved||(de||V.$(":selected").unselect(["tapunselect"]),i(de,["tap","vclick"],W,{x:q[0],y:q[1]}),Z=!1,W.timeStamp-ce<=V.multiClickDebounceTime()?(Se&&clearTimeout(Se),Z=!0,ce=null,i(de,["dbltap","vdblclick"],W,{x:q[0],y:q[1]})):(Se=setTimeout(function(){Z||i(de,["onetap","voneclick"],W,{x:q[0],y:q[1]})},V.multiClickDebounceTime()),ce=W.timeStamp)),de!=null&&!t.dragData.didDrag&&de._private.selectable&&ot"u"){var ae=[],Oe=o(function(W){return{clientX:W.clientX,clientY:W.clientY,force:1,identifier:W.pointerId,pageX:W.pageX,pageY:W.pageY,radiusX:W.width/2,radiusY:W.height/2,screenX:W.screenX,screenY:W.screenY,target:W.target}},"makeTouch"),ge=o(function(W){return{event:W,touch:Oe(W)}},"makePointer"),ze=o(function(W){ae.push(ge(W))},"addPointer"),He=o(function(W){for(var de=0;de0)return H[0]}return null},"getCurveT"),g=Object.keys(p),y=0;y0?m:vme(a,s,e,r,n,i,l,u)},"intersectLine"),checkPoint:o(function(e,r,n,i,a,s,l,u){u=u==="auto"?Vp(i,a):u;var h=2*u;if(Zu(e,r,this.points,s,l,i,a-h,[0,-1],n)||Zu(e,r,this.points,s,l,i-h,a,[0,-1],n))return!0;var f=i/2+2*n,d=a/2+2*n,p=[s-f,l-d,s-f,l,s+f,l,s+f,l-d];return!!(Us(e,r,p)||$p(e,r,h,h,s+i/2-u,l+a/2-u,n)||$p(e,r,h,h,s-i/2+u,l+a/2-u,n))},"checkPoint")}};eh.registerNodeShapes=function(){var t=this.nodeShapes={},e=this;this.generateEllipse(),this.generatePolygon("triangle",gs(3,0)),this.generateRoundPolygon("round-triangle",gs(3,0)),this.generatePolygon("rectangle",gs(4,0)),t.square=t.rectangle,this.generateRoundRectangle(),this.generateCutRectangle(),this.generateBarrel(),this.generateBottomRoundrectangle();{var r=[0,1,1,0,0,-1,-1,0];this.generatePolygon("diamond",r),this.generateRoundPolygon("round-diamond",r)}this.generatePolygon("pentagon",gs(5,0)),this.generateRoundPolygon("round-pentagon",gs(5,0)),this.generatePolygon("hexagon",gs(6,0)),this.generateRoundPolygon("round-hexagon",gs(6,0)),this.generatePolygon("heptagon",gs(7,0)),this.generateRoundPolygon("round-heptagon",gs(7,0)),this.generatePolygon("octagon",gs(8,0)),this.generateRoundPolygon("round-octagon",gs(8,0));var n=new Array(20);{var i=PP(5,0),a=PP(5,Math.PI/5),s=.5*(3-Math.sqrt(5));s*=1.57;for(var l=0;l=e.deqFastCost*C)break}else if(h){if(b>=e.deqCost*m||b>=e.deqAvgCost*p)break}else if(w>=e.deqNoDrawCost*DP)break;var T=e.deq(n,v,y);if(T.length>0)for(var E=0;E0&&(e.onDeqd(n,g),!h&&e.shouldRedraw(n,g,v,y)&&a())},"dequeue"),l=e.priority||rB;i.beforeRender(s,l(n))}},"setupDequeueingImpl")},"setupDequeueing")},RQe=function(){function t(e){var r=arguments.length>1&&arguments[1]!==void 0?arguments[1]:bS;Mf(this,t),this.idsByKey=new Xc,this.keyForId=new Xc,this.cachesByLvl=new Xc,this.lvls=[],this.getKey=e,this.doesEleInvalidateKey=r}return o(t,"ElementTextureCacheLookup"),If(t,[{key:"getIdsFor",value:o(function(r){r==null&&ai("Can not get id list for null key");var n=this.idsByKey,i=this.idsByKey.get(r);return i||(i=new J1,n.set(r,i)),i},"getIdsFor")},{key:"addIdForKey",value:o(function(r,n){r!=null&&this.getIdsFor(r).add(n)},"addIdForKey")},{key:"deleteIdForKey",value:o(function(r,n){r!=null&&this.getIdsFor(r).delete(n)},"deleteIdForKey")},{key:"getNumberOfIdsForKey",value:o(function(r){return r==null?0:this.getIdsFor(r).size},"getNumberOfIdsForKey")},{key:"updateKeyMappingFor",value:o(function(r){var n=r.id(),i=this.keyForId.get(n),a=this.getKey(r);this.deleteIdForKey(i,n),this.addIdForKey(a,n),this.keyForId.set(n,a)},"updateKeyMappingFor")},{key:"deleteKeyMappingFor",value:o(function(r){var n=r.id(),i=this.keyForId.get(n);this.deleteIdForKey(i,n),this.keyForId.delete(n)},"deleteKeyMappingFor")},{key:"keyHasChangedFor",value:o(function(r){var n=r.id(),i=this.keyForId.get(n),a=this.getKey(r);return i!==a},"keyHasChangedFor")},{key:"isInvalid",value:o(function(r){return this.keyHasChangedFor(r)||this.doesEleInvalidateKey(r)},"isInvalid")},{key:"getCachesAt",value:o(function(r){var n=this.cachesByLvl,i=this.lvls,a=n.get(r);return a||(a=new Xc,n.set(r,a),i.push(r)),a},"getCachesAt")},{key:"getCache",value:o(function(r,n){return this.getCachesAt(n).get(r)},"getCache")},{key:"get",value:o(function(r,n){var i=this.getKey(r),a=this.getCache(i,n);return a!=null&&this.updateKeyMappingFor(r),a},"get")},{key:"getForCachedKey",value:o(function(r,n){var i=this.keyForId.get(r.id()),a=this.getCache(i,n);return a},"getForCachedKey")},{key:"hasCache",value:o(function(r,n){return this.getCachesAt(n).has(r)},"hasCache")},{key:"has",value:o(function(r,n){var i=this.getKey(r);return this.hasCache(i,n)},"has")},{key:"setCache",value:o(function(r,n,i){i.key=r,this.getCachesAt(n).set(r,i)},"setCache")},{key:"set",value:o(function(r,n,i){var a=this.getKey(r);this.setCache(a,n,i),this.updateKeyMappingFor(r)},"set")},{key:"deleteCache",value:o(function(r,n){this.getCachesAt(n).delete(r)},"deleteCache")},{key:"delete",value:o(function(r,n){var i=this.getKey(r);this.deleteCache(i,n)},"_delete")},{key:"invalidateKey",value:o(function(r){var n=this;this.lvls.forEach(function(i){return n.deleteCache(r,i)})},"invalidateKey")},{key:"invalidate",value:o(function(r){var n=r.id(),i=this.keyForId.get(n);this.deleteKeyMappingFor(r);var a=this.doesEleInvalidateKey(r);return a&&this.invalidateKey(i),a||this.getNumberOfIdsForKey(i)===0},"invalidate")}]),t}(),I0e=25,sS=50,yS=-4,XP=3,bge=7.99,NQe=8,MQe=1024,IQe=1024,OQe=1024,PQe=.2,BQe=.8,FQe=10,$Qe=.15,zQe=.1,GQe=.9,VQe=.9,UQe=100,HQe=1,H1={dequeue:"dequeue",downscale:"downscale",highQuality:"highQuality"},WQe=la({getKey:null,doesEleInvalidateKey:bS,drawElement:null,getBoundingBox:null,getRotationPoint:null,getRotationOffset:null,isVisible:ume,allowEdgeTxrCaching:!0,allowParentTxrCaching:!0}),Fb=o(function(e,r){var n=this;n.renderer=e,n.onDequeues=[];var i=WQe(r);rr(n,i),n.lookup=new RQe(i.getKey,i.doesEleInvalidateKey),n.setupDequeueing()},"ElementTextureCache"),qi=Fb.prototype;qi.reasons=H1;qi.getTextureQueue=function(t){var e=this;return e.eleImgCaches=e.eleImgCaches||{},e.eleImgCaches[t]=e.eleImgCaches[t]||[]};qi.getRetiredTextureQueue=function(t){var e=this,r=e.eleImgCaches.retired=e.eleImgCaches.retired||{},n=r[t]=r[t]||[];return n};qi.getElementQueue=function(){var t=this,e=t.eleCacheQueue=t.eleCacheQueue||new i4(function(r,n){return n.reqs-r.reqs});return e};qi.getElementKeyToQueue=function(){var t=this,e=t.eleKeyToCacheQueue=t.eleKeyToCacheQueue||{};return e};qi.getElement=function(t,e,r,n,i){var a=this,s=this.renderer,l=s.cy.zoom(),u=this.lookup;if(!e||e.w===0||e.h===0||isNaN(e.w)||isNaN(e.h)||!t.visible()||t.removed()||!a.allowEdgeTxrCaching&&t.isEdge()||!a.allowParentTxrCaching&&t.isParent())return null;if(n==null&&(n=Math.ceil(iB(l*r))),n=bge||n>XP)return null;var h=Math.pow(2,n),f=e.h*h,d=e.w*h,p=s.eleTextBiggerThanMin(t,h);if(!this.isVisible(t,p))return null;var m=u.get(t,n);if(m&&m.invalidated&&(m.invalidated=!1,m.texture.invalidatedWidth-=m.width),m)return m;var g;if(f<=I0e?g=I0e:f<=sS?g=sS:g=Math.ceil(f/sS)*sS,f>OQe||d>IQe)return null;var y=a.getTextureQueue(g),v=y[y.length-2],x=o(function(){return a.recycleTexture(g,d)||a.addTexture(g,d)},"addNewTxr");v||(v=y[y.length-1]),v||(v=x()),v.width-v.usedWidthn;D--)_=a.getElement(t,e,r,D,H1.downscale);I()}else return a.queueElement(t,E.level-1),E;else{var k;if(!w&&!C&&!T)for(var L=n-1;L>=yS;L--){var R=u.get(t,L);if(R){k=R;break}}if(b(k))return a.queueElement(t,n),k;v.context.translate(v.usedWidth,0),v.context.scale(h,h),this.drawElement(v.context,t,e,p,!1),v.context.scale(1/h,1/h),v.context.translate(-v.usedWidth,0)}return m={x:v.usedWidth,texture:v,level:n,scale:h,width:d,height:f,scaledLabelShown:p},v.usedWidth+=Math.ceil(d+NQe),v.eleCaches.push(m),u.set(t,n,m),a.checkTextureFullness(v),m};qi.invalidateElements=function(t){for(var e=0;e=PQe*t.width&&this.retireTexture(t)};qi.checkTextureFullness=function(t){var e=this,r=e.getTextureQueue(t.height);t.usedWidth/t.width>BQe&&t.fullnessChecks>=FQe?Df(r,t):t.fullnessChecks++};qi.retireTexture=function(t){var e=this,r=t.height,n=e.getTextureQueue(r),i=this.lookup;Df(n,t),t.retired=!0;for(var a=t.eleCaches,s=0;s=e)return s.retired=!1,s.usedWidth=0,s.invalidatedWidth=0,s.fullnessChecks=0,nB(s.eleCaches),s.context.setTransform(1,0,0,1,0,0),s.context.clearRect(0,0,s.width,s.height),Df(i,s),n.push(s),s}};qi.queueElement=function(t,e){var r=this,n=r.getElementQueue(),i=r.getElementKeyToQueue(),a=this.getKey(t),s=i[a];if(s)s.level=Math.max(s.level,e),s.eles.merge(t),s.reqs++,n.updateItem(s);else{var l={eles:t.spawn().merge(t),level:e,reqs:1,key:a};n.push(l),i[a]=l}};qi.dequeue=function(t){for(var e=this,r=e.getElementQueue(),n=e.getElementKeyToQueue(),i=[],a=e.lookup,s=0;s0;s++){var l=r.pop(),u=l.key,h=l.eles[0],f=a.hasCache(h,l.level);if(n[u]=null,f)continue;i.push(l);var d=e.getBoundingBox(h);e.getElement(h,d,t,l.level,H1.dequeue)}return i};qi.removeFromQueue=function(t){var e=this,r=e.getElementQueue(),n=e.getElementKeyToQueue(),i=this.getKey(t),a=n[i];a!=null&&(a.eles.length===1?(a.reqs=tB,r.updateItem(a),r.pop(),n[i]=null):a.eles.unmerge(t))};qi.onDequeue=function(t){this.onDequeues.push(t)};qi.offDequeue=function(t){Df(this.onDequeues,t)};qi.setupDequeueing=xge.setupDequeueing({deqRedrawThreshold:UQe,deqCost:$Qe,deqAvgCost:zQe,deqNoDrawCost:GQe,deqFastCost:VQe,deq:o(function(e,r,n){return e.dequeue(r,n)},"deq"),onDeqd:o(function(e,r){for(var n=0;n=YQe||r>_S)return null}n.validateLayersElesOrdering(r,t);var u=n.layersByLevel,h=Math.pow(2,r),f=u[r]=u[r]||[],d,p=n.levelIsComplete(r,t),m,g=o(function(){var I=o(function(O){if(n.validateLayersElesOrdering(O,t),n.levelIsComplete(O,t))return m=u[O],!0},"canUseAsTmpLvl"),D=o(function(O){if(!m)for(var M=r+O;zb<=M&&M<=_S&&!I(M);M+=O);},"checkLvls");D(1),D(-1);for(var k=f.length-1;k>=0;k--){var L=f[k];L.invalid&&Df(f,L)}},"checkTempLevels");if(!p)g();else return f;var y=o(function(){if(!d){d=Hs();for(var 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t=this.data.contexts[0];if(this.forcedPixelRatio!=null)return this.forcedPixelRatio;var e=this.cy.window(),r=t.backingStorePixelRatio||t.webkitBackingStorePixelRatio||t.mozBackingStorePixelRatio||t.msBackingStorePixelRatio||t.oBackingStorePixelRatio||t.backingStorePixelRatio||1;return(e.devicePixelRatio||1)/r};ys.paintCache=function(t){for(var e=this.paintCaches=this.paintCaches||[],r=!0,n,i=0;ie.minMbLowQualFrames&&(e.motionBlurPxRatio=e.mbPxRBlurry)),e.clearingMotionBlur&&(e.motionBlurPxRatio=1),e.textureDrawLastFrame&&!d&&(f[e.NODE]=!0,f[e.SELECT_BOX]=!0);var b=r.style(),w=r.zoom(),C=s!==void 0?s:w,T=r.pan(),E={x:T.x,y:T.y},A={zoom:w,pan:{x:T.x,y:T.y}},S=e.prevViewport,_=S===void 0||A.zoom!==S.zoom||A.pan.x!==S.pan.x||A.pan.y!==S.pan.y;!_&&!(y&&!g)&&(e.motionBlurPxRatio=1),l&&(E=l),C*=u,E.x*=u,E.y*=u;var I=e.getCachedZSortedEles();function D(K,X,te,J,se){var ue=K.globalCompositeOperation;K.globalCompositeOperation="destination-out",e.colorFillStyle(K,255,255,255,e.motionBlurTransparency),K.fillRect(X,te,J,se),K.globalCompositeOperation=ue}o(D,"mbclear");function k(K,X){var te,J,se,ue;!e.clearingMotionBlur&&(K===h.bufferContexts[e.MOTIONBLUR_BUFFER_NODE]||K===h.bufferContexts[e.MOTIONBLUR_BUFFER_DRAG])?(te={x:T.x*m,y:T.y*m},J=w*m,se=e.canvasWidth*m,ue=e.canvasHeight*m):(te=E,J=C,se=e.canvasWidth,ue=e.canvasHeight),K.setTransform(1,0,0,1,0,0),X==="motionBlur"?D(K,0,0,se,ue):!n&&(X===void 0||X)&&K.clearRect(0,0,se,ue),i||(K.translate(te.x,te.y),K.scale(J,J)),l&&K.translate(l.x,l.y),s&&K.scale(s,s)}if(o(k,"setContextTransform"),d||(e.textureDrawLastFrame=!1),d){if(e.textureDrawLastFrame=!0,!e.textureCache){e.textureCache={},e.textureCache.bb=r.mutableElements().boundingBox(),e.textureCache.texture=e.data.bufferCanvases[e.TEXTURE_BUFFER];var L=e.data.bufferContexts[e.TEXTURE_BUFFER];L.setTransform(1,0,0,1,0,0),L.clearRect(0,0,e.canvasWidth*e.textureMult,e.canvasHeight*e.textureMult),e.render({forcedContext:L,drawOnlyNodeLayer:!0,forcedPxRatio:u*e.textureMult});var A=e.textureCache.viewport={zoom:r.zoom(),pan:r.pan(),width:e.canvasWidth,height:e.canvasHeight};A.mpan={x:(0-A.pan.x)/A.zoom,y:(0-A.pan.y)/A.zoom}}f[e.DRAG]=!1,f[e.NODE]=!1;var R=h.contexts[e.NODE],O=e.textureCache.texture,A=e.textureCache.viewport;R.setTransform(1,0,0,1,0,0),p?D(R,0,0,A.width,A.height):R.clearRect(0,0,A.width,A.height);var M=b.core("outside-texture-bg-color").value,B=b.core("outside-texture-bg-opacity").value;e.colorFillStyle(R,M[0],M[1],M[2],B),R.fillRect(0,0,A.width,A.height);var w=r.zoom();k(R,!1),R.clearRect(A.mpan.x,A.mpan.y,A.width/A.zoom/u,A.height/A.zoom/u),R.drawImage(O,A.mpan.x,A.mpan.y,A.width/A.zoom/u,A.height/A.zoom/u)}else e.textureOnViewport&&!n&&(e.textureCache=null);var F=r.extent(),P=e.pinching||e.hoverData.dragging||e.swipePanning||e.data.wheelZooming||e.hoverData.draggingEles||e.cy.animated(),z=e.hideEdgesOnViewport&&P,$=[];if($[e.NODE]=!f[e.NODE]&&p&&!e.clearedForMotionBlur[e.NODE]||e.clearingMotionBlur,$[e.NODE]&&(e.clearedForMotionBlur[e.NODE]=!0),$[e.DRAG]=!f[e.DRAG]&&p&&!e.clearedForMotionBlur[e.DRAG]||e.clearingMotionBlur,$[e.DRAG]&&(e.clearedForMotionBlur[e.DRAG]=!0),f[e.NODE]||i||a||$[e.NODE]){var H=p&&!$[e.NODE]&&m!==1,R=n||(H?e.data.bufferContexts[e.MOTIONBLUR_BUFFER_NODE]:h.contexts[e.NODE]),Q=p&&!H?"motionBlur":void 0;k(R,Q),z?e.drawCachedNodes(R,I.nondrag,u,F):e.drawLayeredElements(R,I.nondrag,u,F),e.debug&&e.drawDebugPoints(R,I.nondrag),!i&&!p&&(f[e.NODE]=!1)}if(!a&&(f[e.DRAG]||i||$[e.DRAG])){var H=p&&!$[e.DRAG]&&m!==1,R=n||(H?e.data.bufferContexts[e.MOTIONBLUR_BUFFER_DRAG]:h.contexts[e.DRAG]);k(R,p&&!H?"motionBlur":void 0),z?e.drawCachedNodes(R,I.drag,u,F):e.drawCachedElements(R,I.drag,u,F),e.debug&&e.drawDebugPoints(R,I.drag),!i&&!p&&(f[e.DRAG]=!1)}if(this.drawSelectionRectangle(t,k),p&&m!==1){var j=h.contexts[e.NODE],ie=e.data.bufferCanvases[e.MOTIONBLUR_BUFFER_NODE],ne=h.contexts[e.DRAG],le=e.data.bufferCanvases[e.MOTIONBLUR_BUFFER_DRAG],he=o(function(X,te,J){X.setTransform(1,0,0,1,0,0),J||!x?X.clearRect(0,0,e.canvasWidth,e.canvasHeight):D(X,0,0,e.canvasWidth,e.canvasHeight);var se=m;X.drawImage(te,0,0,e.canvasWidth*se,e.canvasHeight*se,0,0,e.canvasWidth,e.canvasHeight)},"drawMotionBlur");(f[e.NODE]||$[e.NODE])&&(he(j,ie,$[e.NODE]),f[e.NODE]=!1),(f[e.DRAG]||$[e.DRAG])&&(he(ne,le,$[e.DRAG]),f[e.DRAG]=!1)}e.prevViewport=A,e.clearingMotionBlur&&(e.clearingMotionBlur=!1,e.motionBlurCleared=!0,e.motionBlur=!0),p&&(e.motionBlurTimeout=setTimeout(function(){e.motionBlurTimeout=null,e.clearedForMotionBlur[e.NODE]=!1,e.clearedForMotionBlur[e.DRAG]=!1,e.motionBlur=!1,e.clearingMotionBlur=!d,e.mbFrames=0,f[e.NODE]=!0,f[e.DRAG]=!0,e.redraw()},dZe)),n||r.emit("render")};ys.drawSelectionRectangle=function(t,e){var r=this,n=r.cy,i=r.data,a=n.style(),s=t.drawOnlyNodeLayer,l=t.drawAllLayers,u=i.canvasNeedsRedraw,h=t.forcedContext;if(r.showFps||!s&&u[r.SELECT_BOX]&&!l){var f=h||i.contexts[r.SELECT_BOX];if(e(f),r.selection[4]==1&&(r.hoverData.selecting||r.touchData.selecting)){var d=r.cy.zoom(),p=a.core("selection-box-border-width").value/d;f.lineWidth=p,f.fillStyle="rgba("+a.core("selection-box-color").value[0]+","+a.core("selection-box-color").value[1]+","+a.core("selection-box-color").value[2]+","+a.core("selection-box-opacity").value+")",f.fillRect(r.selection[0],r.selection[1],r.selection[2]-r.selection[0],r.selection[3]-r.selection[1]),p>0&&(f.strokeStyle="rgba("+a.core("selection-box-border-color").value[0]+","+a.core("selection-box-border-color").value[1]+","+a.core("selection-box-border-color").value[2]+","+a.core("selection-box-opacity").value+")",f.strokeRect(r.selection[0],r.selection[1],r.selection[2]-r.selection[0],r.selection[3]-r.selection[1]))}if(i.bgActivePosistion&&!r.hoverData.selecting){var d=r.cy.zoom(),m=i.bgActivePosistion;f.fillStyle="rgba("+a.core("active-bg-color").value[0]+","+a.core("active-bg-color").value[1]+","+a.core("active-bg-color").value[2]+","+a.core("active-bg-opacity").value+")",f.beginPath(),f.arc(m.x,m.y,a.core("active-bg-size").pfValue/d,0,2*Math.PI),f.fill()}var g=r.lastRedrawTime;if(r.showFps&&g){g=Math.round(g);var y=Math.round(1e3/g),v="1 frame = "+g+" ms = "+y+" fps";if(f.setTransform(1,0,0,1,0,0),f.fillStyle="rgba(255, 0, 0, 0.75)",f.strokeStyle="rgba(255, 0, 0, 0.75)",f.font="30px Arial",!Nb){var x=f.measureText(v);Nb=x.actualBoundingBoxAscent}f.fillText(v,0,Nb);var b=60;f.strokeRect(0,Nb+10,250,20),f.fillRect(0,Nb+10,250*Math.min(y/b,1),20)}l||(u[r.SELECT_BOX]=!1)}};o(z0e,"compileShader");o(pZe,"createProgram");o(mZe,"createTextureCanvas");o(wB,"getEffectivePanZoom");o(NP,"modelToRenderedPosition");o(oS,"toWebGLColor");o(lS,"indexToVec4");o(gZe,"vec4ToIndex");o(yZe,"createTexture");o(Sge,"getTypeInfo");o(Cge,"createTypedArray");o(vZe,"createTypedArrayView");o(xZe,"createBufferStaticDraw");o(po,"createBufferDynamicDraw");o(bZe,"createPickingFrameBuffer");G0e=typeof Float32Array<"u"?Float32Array:Array;Math.hypot||(Math.hypot=function(){for(var t=0,e=arguments.length;e--;)t+=arguments[e]*arguments[e];return Math.sqrt(t)});o(Gb,"create");o(Age,"identity");o(wZe,"multiply");o(DS,"translate");o(_ge,"rotate");o(TB,"scale");o(TZe,"projection");Vb={SCREEN:{name:"screen",screen:!0},PICKING:{name:"picking",picking:!0}},Mb=la({getKey:null,drawElement:null,getBoundingBox:null,getRotation:null,getRotationPoint:null,getRotationOffset:null,isVisible:null,getPadding:null}),kZe=function(){function t(e,r){Mf(this,t),this.debugID=Math.floor(Math.random()*1e4),this.r=e,this.atlasSize=r.webglTexSize,this.rows=r.webglTexRows,this.enableWrapping=r.enableWrapping,this.texHeight=Math.floor(this.atlasSize/this.rows),this.maxTexWidth=this.atlasSize,this.texture=null,this.canvas=null,this.needsBuffer=!0,this.freePointer={x:0,row:0},this.keyToLocation=new Map,this.canvas=r.createTextureCanvas(e,this.atlasSize,this.atlasSize),this.scratch=r.createTextureCanvas(e,this.atlasSize,this.texHeight,"scratch")}return o(t,"Atlas"),If(t,[{key:"getKeys",value:o(function(){return new Set(this.keyToLocation.keys())},"getKeys")},{key:"getScale",value:o(function(r){var n=r.w,i=r.h,a=this.texHeight,s=this.maxTexWidth,l=a/i,u=n*l,h=i*l;return u>s&&(l=s/n,u=n*l,h=i*l),{scale:l,texW:u,texH:h}},"getScale")},{key:"draw",value:o(function(r,n,i){var a=this,s=this.atlasSize,l=this.rows,u=this.texHeight,h=this.getScale(n),f=h.scale,d=h.texW,p=h.texH,m=[null,null],g=o(function(w,C){if(i&&C){var T=C.context,E=w.x,A=w.row,S=E,_=u*A;T.save(),T.translate(S,_),T.scale(f,f),i(T,n),T.restore()}},"drawAt"),y=o(function(){g(a.freePointer,a.canvas),m[0]={x:a.freePointer.x,y:a.freePointer.row*u,w:d,h:p},m[1]={x:a.freePointer.x+d,y:a.freePointer.row*u,w:0,h:p},a.freePointer.x+=d,a.freePointer.x==s&&(a.freePointer.x=0,a.freePointer.row++)},"drawNormal"),v=o(function(){var w=a.scratch,C=a.canvas;w.clear(),g({x:0,row:0},w);var T=s-a.freePointer.x,E=d-T,A=u;{var S=a.freePointer.x,_=a.freePointer.row*u,I=T;C.context.drawImage(w,0,0,I,A,S,_,I,A),m[0]={x:S,y:_,w:I,h:p}}{var D=T,k=(a.freePointer.row+1)*u,L=E;C&&C.context.drawImage(w,D,0,L,A,0,k,L,A),m[1]={x:0,y:k,w:L,h:p}}a.freePointer.x=E,a.freePointer.row++},"drawWrapped"),x=o(function(){a.freePointer.x=0,a.freePointer.row++},"moveToStartOfNextRow");if(this.freePointer.x+d<=s)y();else{if(this.freePointer.row>=l-1)return!1;this.freePointer.x===s?(x(),y()):this.enableWrapping?v():(x(),y())}return this.keyToLocation.set(r,m),this.needsBuffer=!0,m},"draw")},{key:"getOffsets",value:o(function(r){return this.keyToLocation.get(r)},"getOffsets")},{key:"isEmpty",value:o(function(){return this.freePointer.x===0&&this.freePointer.row===0},"isEmpty")},{key:"canFit",value:o(function(r){var n=this.atlasSize,i=this.rows,a=this.getScale(r),s=a.texW;return this.freePointer.x+s>n?this.freePointer.row1&&arguments[1]!==void 0?arguments[1]:{},i=n.forceRedraw,a=i===void 0?!1:i,s=n.filterEle,l=s===void 0?function(){return!0}:s,u=n.filterType,h=u===void 0?function(){return!0}:u,f=!1,d=mo(r),p;try{for(d.s();!(p=d.n()).done;){var m=p.value;if(l(m)){var g=m.id(),y=mo(this.getRenderTypes()),v;try{for(y.s();!(v=y.n()).done;){var x=v.value;if(h(x.type)){var b=x.getKey(m);a?(x.atlasCollection.deleteKey(g,b),x.atlasCollection.styleKeyNeedsRedraw.add(b),f=!0):f|=x.atlasCollection.checkKeyIsInvalid(g,b)}}}catch(w){y.e(w)}finally{y.f()}}}}catch(w){d.e(w)}finally{d.f()}return f},"invalidate")},{key:"gc",value:o(function(){var r=mo(this.getRenderTypes()),n;try{for(r.s();!(n=r.n()).done;){var i=n.value;i.atlasCollection.gc()}}catch(a){r.e(a)}finally{r.f()}},"gc")},{key:"isRenderable",value:o(function(r,n){var i=this.getRenderTypeOpts(n);return i&&i.isVisible(r)},"isRenderable")},{key:"startBatch",value:o(function(){this.batchAtlases=[]},"startBatch")},{key:"getAtlasCount",value:o(function(){return this.batchAtlases.length},"getAtlasCount")},{key:"getAtlases",value:o(function(){return this.batchAtlases},"getAtlases")},{key:"getOrCreateAtlas",value:o(function(r,n,i){var a=this.renderTypes.get(i),s=a.getKey(r),l=r.id();return a.atlasCollection.draw(l,s,n,function(u){a.drawElement(u,r,n,!0,!0)})},"getOrCreateAtlas")},{key:"getAtlasIndexForBatch",value:o(function(r){var n=this.batchAtlases.indexOf(r);if(n<0){if(this.batchAtlases.length===this.maxAtlasesPerBatch)return;this.batchAtlases.push(r),n=this.batchAtlases.length-1}return n},"getAtlasIndexForBatch")},{key:"getIndexArray",value:o(function(){return Array.from({length:this.maxAtlases},function(r,n){return n})},"getIndexArray")},{key:"getAtlasInfo",value:o(function(r,n){var i=this.renderTypes.get(n),a=i.getBoundingBox(r),s=this.getOrCreateAtlas(r,a,n),l=this.getAtlasIndexForBatch(s);if(l!==void 0){var u=i.getKey(r),h=s.getOffsets(u),f=_i(h,2),d=f[0],p=f[1];return{atlasID:l,tex:d,tex1:d,tex2:p,bb:a,type:n,styleKey:u}}},"getAtlasInfo")},{key:"canAddToCurrentBatch",value:o(function(r,n){if(this.batchAtlases.length===this.maxAtlasesPerBatch){var i=this.renderTypes.get(n),a=i.getKey(r),s=i.atlasCollection.getAtlas(a);return s&&this.batchAtlases.includes(s)}return!0},"canAddToCurrentBatch")},{key:"setTransformMatrix",value:o(function(r,n,i){var a=arguments.length>3&&arguments[3]!==void 0?arguments[3]:!0,s=n.bb,l=n.type,u=n.tex1,h=n.tex2,f=this.getRenderTypeOpts(l),d=f.getPadding?f.getPadding(i):0,p=u.w/(u.w+h.w);a||(p=1-p);var m=this.getAdjustedBB(s,d,a,p),g,y;Age(r);var v=f.getRotation?f.getRotation(i):0;if(v!==0){var x=f.getRotationPoint(i),b=x.x,w=x.y;DS(r,r,[b,w]),_ge(r,r,v);var C=f.getRotationOffset(i);g=C.x+m.xOffset,y=C.y}else g=m.x1,y=m.y1;DS(r,r,[g,y]),TB(r,r,[m.w,m.h])},"setTransformMatrix")},{key:"getTransformMatrix",value:o(function(r,n){var i=arguments.length>2&&arguments[2]!==void 0?arguments[2]:!0,a=Gb();return this.setTransformMatrix(a,r,n,i),a},"getTransformMatrix")},{key:"getAdjustedBB",value:o(function(r,n,i,a){var s=r.x1,l=r.y1,u=r.w,h=r.h;n&&(s-=n,l-=n,u+=2*n,h+=2*n);var f=0,d=u*a;return i&&a<1?u=d:!i&&a<1&&(f=u-d,s+=f,u=d),{x1:s,y1:l,w:u,h,xOffset:f}},"getAdjustedBB")},{key:"getDebugInfo",value:o(function(){var r=[],n=mo(this.renderTypes),i;try{for(n.s();!(i=n.n()).done;){var a=_i(i.value,2),s=a[0],l=a[1],u=l.atlasCollection.getCounts(),h=u.keyCount,f=u.atlasCount;r.push({type:s,keyCount:h,atlasCount:f})}}catch(d){n.e(d)}finally{n.f()}return r},"getDebugInfo")}]),t}(),MP=0,V0e=1,U0e=2,IP=3,AZe=function(){function t(e,r,n){Mf(this,t),this.r=e,this.gl=r,this.maxInstances=n.webglBatchSize,this.maxAtlases=n.webglTexPerBatch,this.atlasSize=n.webglTexSize,this.bgColor=n.bgColor,n.enableWrapping=!0,n.createTextureCanvas=mZe,this.atlasManager=new CZe(e,n),this.program=this.createShaderProgram(Vb.SCREEN),this.pickingProgram=this.createShaderProgram(Vb.PICKING),this.vao=this.createVAO(),this.debugInfo=[]}return o(t,"ElementDrawingWebGL"),If(t,[{key:"addTextureRenderType",value:o(function(r,n){this.atlasManager.addRenderType(r,n)},"addTextureRenderType")},{key:"invalidate",value:o(function(r){var n=arguments.length>1&&arguments[1]!==void 0?arguments[1]:{},i=n.type,a=this.atlasManager;return i?a.invalidate(r,{filterType:o(function(l){return l===i},"filterType"),forceRedraw:!0}):a.invalidate(r)},"invalidate")},{key:"gc",value:o(function(){this.atlasManager.gc()},"gc")},{key:"createShaderProgram",value:o(function(r){var n=this.gl,i=`#version 300 es +`+this.showPosition(),{text:"",token:null,line:this.yylineno})},"next"),lex:o(function(){var E=this.next();return E||this.lex()},"lex"),begin:o(function(E){this.conditionStack.push(E)},"begin"),popState:o(function(){var E=this.conditionStack.length-1;return E>0?this.conditionStack.pop():this.conditionStack[0]},"popState"),_currentRules:o(function(){return this.conditionStack.length&&this.conditionStack[this.conditionStack.length-1]?this.conditions[this.conditionStack[this.conditionStack.length-1]].rules:this.conditions.INITIAL.rules},"_currentRules"),topState:o(function(E){return E=this.conditionStack.length-1-Math.abs(E||0),E>=0?this.conditionStack[E]:"INITIAL"},"topState"),pushState:o(function(E){this.begin(E)},"pushState"),stateStackSize:o(function(){return this.conditionStack.length},"stateStackSize"),options:{"case-insensitive":!0},performAction:o(function(E,A,S,_){var I=_;switch(S){case 0:return E.getLogger().trace("Found comment",A.yytext),6;break;case 1:return 8;case 2:this.begin("CLASS");break;case 3:return this.popState(),16;break;case 4:this.popState();break;case 5:E.getLogger().trace("Begin icon"),this.begin("ICON");break;case 6:return E.getLogger().trace("SPACELINE"),6;break;case 7:return 7;case 8:return 15;case 9:E.getLogger().trace("end icon"),this.popState();break;case 10:return E.getLogger().trace("Exploding 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E=0;E=7&&e[0]==="d"&&(f=new RegExp(l.data.regex).exec(e))){if(r)return!1;var p=l.data;return{name:t,value:f,strValue:""+e,mapped:p,field:f[1],bypass:r}}else if(e.length>=10&&e[0]==="m"&&(d=new RegExp(l.mapData.regex).exec(e))){if(r||h.multiple)return!1;var m=l.mapData;if(!(h.color||h.number))return!1;var g=this.parse(t,d[4]);if(!g||g.mapped)return!1;var y=this.parse(t,d[5]);if(!y||y.mapped)return!1;if(g.pfValue===y.pfValue||g.strValue===y.strValue)return hn("`"+t+": "+e+"` is not a valid mapper because the output range is zero; converting to `"+t+": "+g.strValue+"`"),this.parse(t,g.strValue);if(h.color){var v=g.value,x=y.value,b=v[0]===x[0]&&v[1]===x[1]&&v[2]===x[2]&&(v[3]===x[3]||(v[3]==null||v[3]===1)&&(x[3]==null||x[3]===1));if(b)return!1}return{name:t,value:d,strValue:""+e,mapped:m,field:d[1],fieldMin:parseFloat(d[2]),fieldMax:parseFloat(d[3]),valueMin:g.value,valueMax:y.value,bypass:r}}}if(h.multiple&&n!=="multiple"){var w;if(u?w=e.split(/\s+/):En(e)?w=e:w=[e],h.evenMultiple&&w.length%2!==0)return null;for(var C=[],T=[],E=[],A="",S=!1,_=0;_0?" 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0?this._private.maxZoom:this.zoomRange({max:e})},"maxZoom"),getZoomedViewport:o(function(e){var r=this._private,n=r.pan,i=r.zoom,a,s,l=!1;if(r.zoomingEnabled||(l=!0),Ct(e)?s=e:Ur(e)&&(s=e.level,e.position!=null?a=$6(e.position,i,n):e.renderedPosition!=null&&(a=e.renderedPosition),a!=null&&!r.panningEnabled&&(l=!0)),s=s>r.maxZoom?r.maxZoom:s,s=sr.maxZoom||!r.zoomingEnabled?s=!0:(r.zoom=u,a.push("zoom"))}if(i&&(!s||!e.cancelOnFailedZoom)&&r.panningEnabled){var h=e.pan;Ct(h.x)&&(r.pan.x=h.x,l=!1),Ct(h.y)&&(r.pan.y=h.y,l=!1),l||a.push("pan")}return a.length>0&&(a.push("viewport"),this.emit(a.join(" ")),this.notify("viewport")),this},"viewport"),center:o(function(e){var r=this.getCenterPan(e);return r&&(this._private.pan=r,this.emit("pan viewport"),this.notify("viewport")),this},"center"),getCenterPan:o(function(e,r){if(this._private.panningEnabled){if(Zt(e)){var n=e;e=this.mutableElements().filter(n)}else vo(e)||(e=this.mutableElements());if(e.length!==0){var i=e.boundingBox(),a=this.width(),s=this.height();r=r===void 0?this._private.zoom:r;var l={x:(a-r*(i.x1+i.x2))/2,y:(s-r*(i.y1+i.y2))/2};return l}}},"getCenterPan"),reset:o(function(){return!this._private.panningEnabled||!this._private.zoomingEnabled?this:(this.viewport({pan:{x:0,y:0},zoom:1}),this)},"reset"),invalidateSize:o(function(){this._private.sizeCache=null},"invalidateSize"),size:o(function(){var e=this._private,r=e.container,n=this;return e.sizeCache=e.sizeCache||(r?function(){var i=n.window().getComputedStyle(r),a=o(function(l){return parseFloat(i.getPropertyValue(l))},"val");return{width:r.clientWidth-a("padding-left")-a("padding-right"),height:r.clientHeight-a("padding-top")-a("padding-bottom")}}():{width:1,height:1})},"size"),width:o(function(){return this.size().width},"width"),height:o(function(){return this.size().height},"height"),extent:o(function(){var e=this._private.pan,r=this._private.zoom,n=this.renderedExtent(),i={x1:(n.x1-e.x)/r,x2:(n.x2-e.x)/r,y1:(n.y1-e.y)/r,y2:(n.y2-e.y)/r};return i.w=i.x2-i.x1,i.h=i.y2-i.y1,i},"extent"),renderedExtent:o(function(){var e=this.width(),r=this.height();return{x1:0,y1:0,x2:e,y2:r,w:e,h:r}},"renderedExtent"),multiClickDebounceTime:o(function(e){if(e)this._private.multiClickDebounceTime=e;else return this._private.multiClickDebounceTime;return this},"multiClickDebounceTime")};Qp.centre=Qp.center;Qp.autolockNodes=Qp.autolock;Qp.autoungrabifyNodes=Qp.autoungrabify;a4={data:un.data({field:"data",bindingEvent:"data",allowBinding:!0,allowSetting:!0,settingEvent:"data",settingTriggersEvent:!0,triggerFnName:"trigger",allowGetting:!0,updateStyle:!0}),removeData:un.removeData({field:"data",event:"data",triggerFnName:"trigger",triggerEvent:!0,updateStyle:!0}),scratch:un.data({field:"scratch",bindingEvent:"scratch",allowBinding:!0,allowSetting:!0,settingEvent:"scratch",settingTriggersEvent:!0,triggerFnName:"trigger",allowGetting:!0,updateStyle:!0}),removeScratch:un.removeData({field:"scratch",event:"scratch",triggerFnName:"trigger",triggerEvent:!0,updateStyle:!0})};a4.attr=a4.data;a4.removeAttr=a4.removeData;s4=o(function(e){var r=this;e=rr({},e);var n=e.container;n&&!E6(n)&&E6(n[0])&&(n=n[0]);var i=n?n._cyreg:null;i=i||{},i&&i.cy&&(i.cy.destroy(),i={});var a=i.readies=i.readies||[];n&&(n._cyreg=i),i.cy=r;var s=Hi!==void 0&&n!==void 0&&!e.headless,l=e;l.layout=rr({name:s?"grid":"null"},l.layout),l.renderer=rr({name:s?"canvas":"null"},l.renderer);var u=o(function(g,y,v){return y!==void 0?y:v!==void 0?v:g},"defVal"),h=this._private={container:n,ready:!1,options:l,elements:new ka(this),listeners:[],aniEles:new ka(this),data:l.data||{},scratch:{},layout:null,renderer:null,destroyed:!1,notificationsEnabled:!0,minZoom:1e-50,maxZoom:1e50,zoomingEnabled:u(!0,l.zoomingEnabled),userZoomingEnabled:u(!0,l.userZoomingEnabled),panningEnabled:u(!0,l.panningEnabled),userPanningEnabled:u(!0,l.userPanningEnabled),boxSelectionEnabled:u(!0,l.boxSelectionEnabled),autolock:u(!1,l.autolock,l.autolockNodes),autoungrabify:u(!1,l.autoungrabify,l.autoungrabifyNodes),autounselectify:u(!1,l.autounselectify),styleEnabled:l.styleEnabled===void 0?s:l.styleEnabled,zoom:Ct(l.zoom)?l.zoom:1,pan:{x:Ur(l.pan)&&Ct(l.pan.x)?l.pan.x:0,y:Ur(l.pan)&&Ct(l.pan.y)?l.pan.y:0},animation:{current:[],queue:[]},hasCompoundNodes:!1,multiClickDebounceTime:u(250,l.multiClickDebounceTime)};this.createEmitter(),this.selectionType(l.selectionType),this.zoomRange({min:l.minZoom,max:l.maxZoom});var f=o(function(g,y){var v=g.some(XHe);if(v)return oy.all(g).then(y);y(g)},"loadExtData");h.styleEnabled&&r.setStyle([]);var d=rr({},l,l.renderer);r.initRenderer(d);var p=o(function(g,y,v){r.notifications(!1);var x=r.mutableElements();x.length>0&&x.remove(),g!=null&&(Ur(g)||En(g))&&r.add(g),r.one("layoutready",function(w){r.notifications(!0),r.emit(w),r.one("load",y),r.emitAndNotify("load")}).one("layoutstop",function(){r.one("done",v),r.emit("done")});var b=rr({},r._private.options.layout);b.eles=r.elements(),r.layout(b).run()},"setElesAndLayout");f([l.style,l.elements],function(m){var g=m[0],y=m[1];h.styleEnabled&&r.style().append(g),p(y,function(){r.startAnimationLoop(),h.ready=!0,si(l.ready)&&r.on("ready",l.ready);for(var v=0;v0,l=!!t.boundingBox,u=e.extent(),h=qs(l?t.boundingBox:{x1:u.x1,y1:u.y1,w:u.w,h:u.h}),f;if(vo(t.roots))f=t.roots;else if(En(t.roots)){for(var d=[],p=0;p0;){var O=R(),M=I(O,k);if(M)O.outgoers().filter(function(ae){return ae.isNode()&&r.has(ae)}).forEach(D);else if(M===null){hn("Detected double maximal shift for node `"+O.id()+"`. Bailing maximal adjustment due to cycle. Use `options.maximal: true` only on DAGs.");break}}}var P=0;if(t.avoidOverlap)for(var B=0;B0&&b[0].length<=3?ze/2:0),Ie=2*Math.PI/b[Be].length*He;return Be===0&&b[0].length===1&&(Le=1),{x:ce.x+Le*Math.cos(Ie),y:ce.y+Le*Math.sin(Ie)}}else{var xe=b[Be].length,q=Math.max(xe===1?0:l?(h.w-t.padding*2-le.w)/((t.grid?Se:xe)-1):(h.w-t.padding*2-le.w)/((t.grid?Se:xe)+1),P),de={x:ce.x+(He+1-(xe+1)/2)*q,y:ce.y+(Be+1-(he+1)/2)*J};return de}},"getPosition");return r.nodes().layoutPositions(this,t,se),this};YKe={fit:!0,padding:30,boundingBox:void 0,avoidOverlap:!0,nodeDimensionsIncludeLabels:!1,spacingFactor:void 0,radius:void 0,startAngle:3/2*Math.PI,sweep:void 0,clockwise:!0,sort:void 0,animate:!1,animationDuration:500,animationEasing:void 0,animateFilter:o(function(e,r){return!0},"animateFilter"),ready:void 0,stop:void 0,transform:o(function(e,r){return r},"transform")};o(Zme,"CircleLayout");Zme.prototype.run=function(){var t=this.options,e=t,r=t.cy,n=e.eles,i=e.counterclockwise!==void 0?!e.counterclockwise:e.clockwise,a=n.nodes().not(":parent");e.sort&&(a=a.sort(e.sort));for(var s=qs(e.boundingBox?e.boundingBox:{x1:0,y1:0,w:r.width(),h:r.height()}),l={x:s.x1+s.w/2,y:s.y1+s.h/2},u=e.sweep===void 0?2*Math.PI-2*Math.PI/a.length:e.sweep,h=u/Math.max(1,a.length-1),f,d=0,p=0;p1&&e.avoidOverlap){d*=1.75;var x=Math.cos(h)-Math.cos(0),b=Math.sin(h)-Math.sin(0),w=Math.sqrt(d*d/(x*x+b*b));f=Math.max(w,f)}var C=o(function(E,A){var S=e.startAngle+A*h*(i?1:-1),_=f*Math.cos(S),I=f*Math.sin(S),L={x:l.x+_,y:l.y+I};return L},"getPos");return n.nodes().layoutPositions(this,e,C),this};XKe={fit:!0,padding:30,startAngle:3/2*Math.PI,sweep:void 0,clockwise:!0,equidistant:!1,minNodeSpacing:10,boundingBox:void 0,avoidOverlap:!0,nodeDimensionsIncludeLabels:!1,height:void 0,width:void 0,spacingFactor:void 0,concentric:o(function(e){return e.degree()},"concentric"),levelWidth:o(function(e){return e.maxDegree()/4},"levelWidth"),animate:!1,animationDuration:500,animationEasing:void 0,animateFilter:o(function(e,r){return!0},"animateFilter"),ready:void 0,stop:void 0,transform:o(function(e,r){return r},"transform")};o(Jme,"ConcentricLayout");Jme.prototype.run=function(){for(var t=this.options,e=t,r=e.counterclockwise!==void 0?!e.counterclockwise:e.clockwise,n=t.cy,i=e.eles,a=i.nodes().not(":parent"),s=qs(e.boundingBox?e.boundingBox:{x1:0,y1:0,w:n.width(),h:n.height()}),l={x:s.x1+s.w/2,y:s.y1+s.h/2},u=[],h=0,f=0;f0){var T=Math.abs(b[0].value-C.value);T>=v&&(b=[],x.push(b))}b.push(C)}var E=h+e.minNodeSpacing;if(!e.avoidOverlap){var A=x.length>0&&x[0].length>1,S=Math.min(s.w,s.h)/2-E,_=S/(x.length+A?1:0);E=Math.min(E,_)}for(var I=0,L=0;L1&&e.avoidOverlap){var O=Math.cos(R)-Math.cos(0),M=Math.sin(R)-Math.sin(0),P=Math.sqrt(E*E/(O*O+M*M));I=Math.max(P,I)}k.r=I,I+=E}if(e.equidistant){for(var B=0,F=0,z=0;z=t.numIter||(rQe(n,t),n.temperature=n.temperature*t.coolingFactor,n.temperature=t.animationThreshold&&a(),S6(d)}},"frame");f()}else{for(;h;)h=s(u),u++;b0e(n,t),l()}return this};K6.prototype.stop=function(){return this.stopped=!0,this.thread&&this.thread.stop(),this.emit("layoutstop"),this};K6.prototype.destroy=function(){return this.thread&&this.thread.stop(),this};KKe=o(function(e,r,n){for(var i=n.eles.edges(),a=n.eles.nodes(),s=qs(n.boundingBox?n.boundingBox:{x1:0,y1:0,w:e.width(),h:e.height()}),l={isCompound:e.hasCompoundNodes(),layoutNodes:[],idToIndex:{},nodeSize:a.size(),graphSet:[],indexToGraph:[],layoutEdges:[],edgeSize:i.size(),temperature:n.initialTemp,clientWidth:s.w,clientHeight:s.h,boundingBox:s},u=n.eles.components(),h={},f=0;f0){l.graphSet.push(S);for(var f=0;fi.count?0:i.graph},"findLCA"),ZKe=o(function t(e,r,n,i){var a=i.graphSet[n];if(-10)var d=i.nodeOverlap*f,p=Math.sqrt(l*l+u*u),m=d*l/p,g=d*u/p;else var y=N6(e,l,u),v=N6(r,-1*l,-1*u),x=v.x-y.x,b=v.y-y.y,w=x*x+b*b,p=Math.sqrt(w),d=(e.nodeRepulsion+r.nodeRepulsion)/w,m=d*x/p,g=d*b/p;e.isLocked||(e.offsetX-=m,e.offsetY-=g),r.isLocked||(r.offsetX+=m,r.offsetY+=g)}},"nodeRepulsion"),aQe=o(function(e,r,n,i){if(n>0)var a=e.maxX-r.minX;else var a=r.maxX-e.minX;if(i>0)var s=e.maxY-r.minY;else var s=r.maxY-e.minY;return a>=0&&s>=0?Math.sqrt(a*a+s*s):0},"nodesOverlap"),N6=o(function(e,r,n){var i=e.positionX,a=e.positionY,s=e.height||1,l=e.width||1,u=n/r,h=s/l,f={};return r===0&&0n?(f.x=i,f.y=a+s/2,f):0r&&-1*h<=u&&u<=h?(f.x=i-l/2,f.y=a-l*n/2/r,f):0=h)?(f.x=i+s*r/2/n,f.y=a+s/2,f):(0>n&&(u<=-1*h||u>=h)&&(f.x=i-s*r/2/n,f.y=a-s/2),f)},"findClippingPoint"),sQe=o(function(e,r){for(var n=0;nn){var v=r.gravity*m/y,x=r.gravity*g/y;p.offsetX+=v,p.offsetY+=x}}}}},"calculateGravityForces"),lQe=o(function(e,r){var n=[],i=0,a=-1;for(n.push.apply(n,e.graphSet[0]),a+=e.graphSet[0].length;i<=a;){var s=n[i++],l=e.idToIndex[s],u=e.layoutNodes[l],h=u.children;if(0n)var a={x:n*e/i,y:n*r/i};else var a={x:e,y:r};return a},"limitForce"),hQe=o(function t(e,r){var n=e.parentId;if(n!=null){var i=r.layoutNodes[r.idToIndex[n]],a=!1;if((i.maxX==null||e.maxX+i.padRight>i.maxX)&&(i.maxX=e.maxX+i.padRight,a=!0),(i.minX==null||e.minX-i.padLefti.maxY)&&(i.maxY=e.maxY+i.padBottom,a=!0),(i.minY==null||e.minY-i.padTopx&&(g+=v+r.componentSpacing,m=0,y=0,v=0)}}},"separateComponents"),fQe={fit:!0,padding:30,boundingBox:void 0,avoidOverlap:!0,avoidOverlapPadding:10,nodeDimensionsIncludeLabels:!1,spacingFactor:void 0,condense:!1,rows:void 0,cols:void 0,position:o(function(e){},"position"),sort:void 0,animate:!1,animationDuration:500,animationEasing:void 0,animateFilter:o(function(e,r){return!0},"animateFilter"),ready:void 0,stop:void 0,transform:o(function(e,r){return r},"transform")};o(tge,"GridLayout");tge.prototype.run=function(){var t=this.options,e=t,r=t.cy,n=e.eles,i=n.nodes().not(":parent");e.sort&&(i=i.sort(e.sort));var a=qs(e.boundingBox?e.boundingBox:{x1:0,y1:0,w:r.width(),h:r.height()});if(a.h===0||a.w===0)n.nodes().layoutPositions(this,e,function(Q){return{x:a.x1,y:a.y1}});else{var s=i.size(),l=Math.sqrt(s*a.h/a.w),u=Math.round(l),h=Math.round(a.w/a.h*l),f=o(function(te){if(te==null)return Math.min(u,h);var Y=Math.min(u,h);Y==u?u=te:h=te},"small"),d=o(function(te){if(te==null)return Math.max(u,h);var Y=Math.max(u,h);Y==u?u=te:h=te},"large"),p=e.rows,m=e.cols!=null?e.cols:e.columns;if(p!=null&&m!=null)u=p,h=m;else if(p!=null&&m==null)u=p,h=Math.ceil(s/u);else if(p==null&&m!=null)h=m,u=Math.ceil(s/h);else if(h*u>s){var g=f(),y=d();(g-1)*y>=s?f(g-1):(y-1)*g>=s&&d(y-1)}else for(;h*u=s?d(x+1):f(v+1)}var b=a.w/h,w=a.h/u;if(e.condense&&(b=0,w=0),e.avoidOverlap)for(var C=0;C=h&&(O=0,R++)},"moveToNextCell"),P={},B=0;B(O=Pqe(t,e,M[P],M[P+1],M[P+2],M[P+3])))return v(A,O),!0}else if(_.edgeType==="bezier"||_.edgeType==="multibezier"||_.edgeType==="self"||_.edgeType==="compound"){for(var M=_.allpts,P=0;P+5<_.allpts.length;P+=4)if(Nqe(t,e,M[P],M[P+1],M[P+2],M[P+3],M[P+4],M[P+5],R)&&D>(O=Oqe(t,e,M[P],M[P+1],M[P+2],M[P+3],M[P+4],M[P+5])))return v(A,O),!0}for(var B=B||S.source,F=F||S.target,z=i.getArrowWidth(I,L),$=[{name:"source",x:_.arrowStartX,y:_.arrowStartY,angle:_.srcArrowAngle},{name:"target",x:_.arrowEndX,y:_.arrowEndY,angle:_.tgtArrowAngle},{name:"mid-source",x:_.midX,y:_.midY,angle:_.midsrcArrowAngle},{name:"mid-target",x:_.midX,y:_.midY,angle:_.midtgtArrowAngle}],P=0;P<$.length;P++){var U=$[P],Q=a.arrowShapes[A.pstyle(U.name+"-arrow-shape").value],te=A.pstyle("width").pfValue;if(Q.roughCollide(t,e,z,U.angle,{x:U.x,y:U.y},te,f)&&Q.collide(t,e,z,U.angle,{x:U.x,y:U.y},te,f))return v(A),!0}h&&l.length>0&&(x(B),x(F))}o(b,"checkEdge");function w(A,S,_){return Ul(A,S,_)}o(w,"preprop");function C(A,S){var _=A._private,I=p,L;S?L=S+"-":L="",A.boundingBox();var k=_.labelBounds[S||"main"],D=A.pstyle(L+"label").value,R=A.pstyle("text-events").strValue==="yes";if(!(!R||!D)){var O=w(_.rscratch,"labelX",S),M=w(_.rscratch,"labelY",S),P=w(_.rscratch,"labelAngle",S),B=A.pstyle(L+"text-margin-x").pfValue,F=A.pstyle(L+"text-margin-y").pfValue,z=k.x1-I-B,$=k.x2+I-B,U=k.y1-I-F,Q=k.y2+I-F;if(P){var te=Math.cos(P),Y=Math.sin(P),he=o(function(ce,le){return ce=ce-O,le=le-M,{x:ce*te-le*Y+O,y:ce*Y+le*te+M}},"rotate"),Z=he(z,U),ue=he(z,Q),K=he($,U),j=he($,Q),ne=[Z.x+B,Z.y+F,K.x+B,K.y+F,j.x+B,j.y+F,ue.x+B,ue.y+F];if(Ws(t,e,ne))return v(A),!0}else if(ny(k,t,e))return v(A),!0}}o(C,"checkLabel");for(var T=s.length-1;T>=0;T--){var E=s[T];E.isNode()?x(E)||C(E):b(E)||C(E)||C(E,"source")||C(E,"target")}return l};Jp.getAllInBox=function(t,e,r,n){var i=this.getCachedZSortedEles().interactive,a=[],s=Math.min(t,r),l=Math.max(t,r),u=Math.min(e,n),h=Math.max(e,n);t=s,r=l,e=u,n=h;for(var f=qs({x1:t,y1:e,x2:r,y2:n}),d=0;d0?-(Math.PI-e.ang):Math.PI+e.ang},"invertVec"),vQe=o(function(e,r,n,i,a){if(e!==S0e?C0e(r,e,Kc):yQe(el,Kc),C0e(r,n,el),k0e=Kc.nx*el.ny-Kc.ny*el.nx,E0e=Kc.nx*el.nx-Kc.ny*-el.ny,eh=Math.asin(Math.max(-1,Math.min(1,k0e))),Math.abs(eh)<1e-6){YP=r.x,XP=r.y,Hp=X1=0;return}Wp=1,T6=!1,E0e<0?eh<0?eh=Math.PI+eh:(eh=Math.PI-eh,Wp=-1,T6=!0):eh>0&&(Wp=-1,T6=!0),r.radius!==void 0?X1=r.radius:X1=i,zp=eh/2,h6=Math.min(Kc.len/2,el.len/2),a?(jc=Math.abs(Math.cos(zp)*X1/Math.sin(zp)),jc>h6?(jc=h6,Hp=Math.abs(jc*Math.sin(zp)/Math.cos(zp))):Hp=X1):(jc=Math.min(h6,X1),Hp=Math.abs(jc*Math.sin(zp)/Math.cos(zp))),jP=r.x+el.nx*jc,KP=r.y+el.ny*jc,YP=jP-el.ny*Hp*Wp,XP=KP+el.nx*Hp*Wp,age=r.x+Kc.nx*jc,sge=r.y+Kc.ny*jc,S0e=r},"calcCornerArc");o(oge,"drawPreparedRoundCorner");o(wB,"getRoundCorner");Va={};Va.findMidptPtsEtc=function(t,e){var r=e.posPts,n=e.intersectionPts,i=e.vectorNormInverse,a,s=t.pstyle("source-endpoint"),l=t.pstyle("target-endpoint"),u=s.units!=null&&l.units!=null,h=o(function(T,E,A,S){var _=S-E,I=A-T,L=Math.sqrt(I*I+_*_);return{x:-_/L,y:I/L}},"recalcVectorNormInverse"),f=t.pstyle("edge-distances").value;switch(f){case"node-position":a=r;break;case"intersection":a=n;break;case"endpoints":{if(u){var d=this.manualEndptToPx(t.source()[0],s),p=Di(d,2),m=p[0],g=p[1],y=this.manualEndptToPx(t.target()[0],l),v=Di(y,2),x=v[0],b=v[1],w={x1:m,y1:g,x2:x,y2:b};i=h(m,g,x,b),a=w}else hn("Edge ".concat(t.id()," has edge-distances:endpoints specified without manual endpoints specified via source-endpoint and target-endpoint. Falling back on edge-distances:intersection (default).")),a=n;break}}return{midptPts:a,vectorNormInverse:i}};Va.findHaystackPoints=function(t){for(var e=0;e0?Math.max(W-pe,0):Math.min(W+pe,0)},"subDWH"),D=k(I,S),R=k(L,_),O=!1;b===h?x=Math.abs(D)>Math.abs(R)?i:n:b===u||b===l?(x=n,O=!0):(b===a||b===s)&&(x=i,O=!0);var M=x===n,P=M?R:D,B=M?L:I,F=hme(B),z=!1;!(O&&(C||E))&&(b===l&&B<0||b===u&&B>0||b===a&&B>0||b===s&&B<0)&&(F*=-1,P=F*Math.abs(P),z=!0);var $;if(C){var U=T<0?1+T:T;$=U*P}else{var Q=T<0?P:0;$=Q+T*F}var te=o(function(W){return Math.abs(W)=Math.abs(P)},"getIsTooClose"),Y=te($),he=te(Math.abs(P)-Math.abs($)),Z=Y||he;if(Z&&!z)if(M){var ue=Math.abs(B)<=p/2,K=Math.abs(I)<=m/2;if(ue){var j=(f.x1+f.x2)/2,ne=f.y1,ee=f.y2;r.segpts=[j,ne,j,ee]}else if(K){var ce=(f.y1+f.y2)/2,le=f.x1,J=f.x2;r.segpts=[le,ce,J,ce]}else r.segpts=[f.x1,f.y2]}else{var Se=Math.abs(B)<=d/2,se=Math.abs(L)<=g/2;if(Se){var ae=(f.y1+f.y2)/2,Oe=f.x1,ye=f.x2;r.segpts=[Oe,ae,ye,ae]}else if(se){var Be=(f.x1+f.x2)/2,He=f.y1,ze=f.y2;r.segpts=[Be,He,Be,ze]}else r.segpts=[f.x2,f.y1]}else if(M){var Le=f.y1+$+(v?p/2*F:0),Ie=f.x1,xe=f.x2;r.segpts=[Ie,Le,xe,Le]}else{var q=f.x1+$+(v?d/2*F:0),de=f.y1,ie=f.y2;r.segpts=[q,de,q,ie]}if(r.isRound){var oe=t.pstyle("taxi-radius").value,V=t.pstyle("radius-type").value[0]==="arc-radius";r.radii=new Array(r.segpts.length/2).fill(oe),r.isArcRadius=new Array(r.segpts.length/2).fill(V)}};Va.tryToCorrectInvalidPoints=function(t,e){var r=t._private.rscratch;if(r.edgeType==="bezier"){var n=e.srcPos,i=e.tgtPos,a=e.srcW,s=e.srcH,l=e.tgtW,u=e.tgtH,h=e.srcShape,f=e.tgtShape,d=e.srcCornerRadius,p=e.tgtCornerRadius,m=e.srcRs,g=e.tgtRs,y=!Ct(r.startX)||!Ct(r.startY),v=!Ct(r.arrowStartX)||!Ct(r.arrowStartY),x=!Ct(r.endX)||!Ct(r.endY),b=!Ct(r.arrowEndX)||!Ct(r.arrowEndY),w=3,C=this.getArrowWidth(t.pstyle("width").pfValue,t.pstyle("arrow-scale").value)*this.arrowShapeWidth,T=w*C,E=Xp({x:r.ctrlpts[0],y:r.ctrlpts[1]},{x:r.startX,y:r.startY}),A=ER.poolIndex()){var O=D;D=R,R=O}var M=_.srcPos=D.position(),P=_.tgtPos=R.position(),B=_.srcW=D.outerWidth(),F=_.srcH=D.outerHeight(),z=_.tgtW=R.outerWidth(),$=_.tgtH=R.outerHeight(),U=_.srcShape=r.nodeShapes[e.getNodeShape(D)],Q=_.tgtShape=r.nodeShapes[e.getNodeShape(R)],te=_.srcCornerRadius=D.pstyle("corner-radius").value==="auto"?"auto":D.pstyle("corner-radius").pfValue,Y=_.tgtCornerRadius=R.pstyle("corner-radius").value==="auto"?"auto":R.pstyle("corner-radius").pfValue,he=_.tgtRs=R._private.rscratch,Z=_.srcRs=D._private.rscratch;_.dirCounts={north:0,west:0,south:0,east:0,northwest:0,southwest:0,northeast:0,southeast:0};for(var ue=0;ue<_.eles.length;ue++){var K=_.eles[ue],j=K[0]._private.rscratch,ne=K.pstyle("curve-style").value,ee=ne==="unbundled-bezier"||ne.endsWith("segments")||ne.endsWith("taxi"),ce=!D.same(K.source());if(!_.calculatedIntersection&&D!==R&&(_.hasBezier||_.hasUnbundled)){_.calculatedIntersection=!0;var le=U.intersectLine(M.x,M.y,B,F,P.x,P.y,0,te,Z),J=_.srcIntn=le,Se=Q.intersectLine(P.x,P.y,z,$,M.x,M.y,0,Y,he),se=_.tgtIntn=Se,ae=_.intersectionPts={x1:le[0],x2:Se[0],y1:le[1],y2:Se[1]},Oe=_.posPts={x1:M.x,x2:P.x,y1:M.y,y2:P.y},ye=Se[1]-le[1],Be=Se[0]-le[0],He=Math.sqrt(Be*Be+ye*ye),ze=_.vector={x:Be,y:ye},Le=_.vectorNorm={x:ze.x/He,y:ze.y/He},Ie={x:-Le.y,y:Le.x};_.nodesOverlap=!Ct(He)||Q.checkPoint(le[0],le[1],0,z,$,P.x,P.y,Y,he)||U.checkPoint(Se[0],Se[1],0,B,F,M.x,M.y,te,Z),_.vectorNormInverse=Ie,I={nodesOverlap:_.nodesOverlap,dirCounts:_.dirCounts,calculatedIntersection:!0,hasBezier:_.hasBezier,hasUnbundled:_.hasUnbundled,eles:_.eles,srcPos:P,srcRs:he,tgtPos:M,tgtRs:Z,srcW:z,srcH:$,tgtW:B,tgtH:F,srcIntn:se,tgtIntn:J,srcShape:Q,tgtShape:U,posPts:{x1:Oe.x2,y1:Oe.y2,x2:Oe.x1,y2:Oe.y1},intersectionPts:{x1:ae.x2,y1:ae.y2,x2:ae.x1,y2:ae.y1},vector:{x:-ze.x,y:-ze.y},vectorNorm:{x:-Le.x,y:-Le.y},vectorNormInverse:{x:-Ie.x,y:-Ie.y}}}var xe=ce?I:_;j.nodesOverlap=xe.nodesOverlap,j.srcIntn=xe.srcIntn,j.tgtIntn=xe.tgtIntn,j.isRound=ne.startsWith("round"),i&&(D.isParent()||D.isChild()||R.isParent()||R.isChild())&&(D.parents().anySame(R)||R.parents().anySame(D)||D.same(R)&&D.isParent())?e.findCompoundLoopPoints(K,xe,ue,ee):D===R?e.findLoopPoints(K,xe,ue,ee):ne.endsWith("segments")?e.findSegmentsPoints(K,xe):ne.endsWith("taxi")?e.findTaxiPoints(K,xe):ne==="straight"||!ee&&_.eles.length%2===1&&ue===Math.floor(_.eles.length/2)?e.findStraightEdgePoints(K):e.findBezierPoints(K,xe,ue,ee,ce),e.findEndpoints(K),e.tryToCorrectInvalidPoints(K,xe),e.checkForInvalidEdgeWarning(K),e.storeAllpts(K),e.storeEdgeProjections(K),e.calculateArrowAngles(K),e.recalculateEdgeLabelProjections(K),e.calculateLabelAngles(K)}},"_loop"),T=0;T0){var ee=a,ce=Vp(ee,K1(r)),le=Vp(ee,K1(ne)),J=ce;if(le2){var Se=Vp(ee,{x:ne[2],y:ne[3]});Se0){var ie=s,oe=Vp(ie,K1(r)),V=Vp(ie,K1(de)),we=oe;if(V2){var W=Vp(ie,{x:de[2],y:de[3]});W=g||A){v={cp:C,segment:E};break}}if(v)break}var S=v.cp,_=v.segment,I=(g-x)/_.length,L=_.t1-_.t0,k=m?_.t0+L*I:_.t1-L*I;k=e4(0,k,1),e=Z1(S.p0,S.p1,S.p2,k),p=bQe(S.p0,S.p1,S.p2,k);break}case"straight":case"segments":case"haystack":{for(var D=0,R,O,M,P,B=n.allpts.length,F=0;F+3=g));F+=2);var z=g-O,$=z/R;$=e4(0,$,1),e=Sqe(M,P,$),p=uge(M,P);break}}s("labelX",d,e.x),s("labelY",d,e.y),s("labelAutoAngle",d,p)}},"calculateEndProjection");h("source"),h("target"),this.applyLabelDimensions(t)}};eu.applyLabelDimensions=function(t){this.applyPrefixedLabelDimensions(t),t.isEdge()&&(this.applyPrefixedLabelDimensions(t,"source"),this.applyPrefixedLabelDimensions(t,"target"))};eu.applyPrefixedLabelDimensions=function(t,e){var r=t._private,n=this.getLabelText(t,e),i=this.calculateLabelDimensions(t,n),a=t.pstyle("line-height").pfValue,s=t.pstyle("text-wrap").strValue,l=Ul(r.rscratch,"labelWrapCachedLines",e)||[],u=s!=="wrap"?1:Math.max(l.length,1),h=i.height/u,f=h*a,d=i.width,p=i.height+(u-1)*(a-1)*h;Df(r.rstyle,"labelWidth",e,d),Df(r.rscratch,"labelWidth",e,d),Df(r.rstyle,"labelHeight",e,p),Df(r.rscratch,"labelHeight",e,p),Df(r.rscratch,"labelLineHeight",e,f)};eu.getLabelText=function(t,e){var r=t._private,n=e?e+"-":"",i=t.pstyle(n+"label").strValue,a=t.pstyle("text-transform").value,s=o(function(Q,te){return te?(Df(r.rscratch,Q,e,te),te):Ul(r.rscratch,Q,e)},"rscratch");if(!i)return"";a=="none"||(a=="uppercase"?i=i.toUpperCase():a=="lowercase"&&(i=i.toLowerCase()));var l=t.pstyle("text-wrap").value;if(l==="wrap"){var u=s("labelKey");if(u!=null&&s("labelWrapKey")===u)return s("labelWrapCachedText");for(var h="\u200B",f=i.split(` +`),d=t.pstyle("text-max-width").pfValue,p=t.pstyle("text-overflow-wrap").value,m=p==="anywhere",g=[],y=/[\s\u200b]+|$/g,v=0;vd){var T=x.matchAll(y),E="",A=0,S=yo(T),_;try{for(S.s();!(_=S.n()).done;){var I=_.value,L=I[0],k=x.substring(A,I.index);A=I.index+L.length;var D=E.length===0?k:E+k+L,R=this.calculateLabelDimensions(t,D),O=R.width;O<=d?E+=k+L:(E&&g.push(E),E=k+L)}}catch(U){S.e(U)}finally{S.f()}E.match(/^[\s\u200b]+$/)||g.push(E)}else g.push(x)}s("labelWrapCachedLines",g),i=s("labelWrapCachedText",g.join(` +`)),s("labelWrapKey",u)}else if(l==="ellipsis"){var M=t.pstyle("text-max-width").pfValue,P="",B="\u2026",F=!1;if(this.calculateLabelDimensions(t,i).widthM)break;P+=i[z],z===i.length-1&&(F=!0)}return F||(P+=B),P}return i};eu.getLabelJustification=function(t){var e=t.pstyle("text-justification").strValue,r=t.pstyle("text-halign").strValue;if(e==="auto")if(t.isNode())switch(r){case"left":return"right";case"right":return"left";default:return"center"}else return"center";else return e};eu.calculateLabelDimensions=function(t,e){var r=this,n=r.cy.window(),i=n.document,a=If(e,t._private.labelDimsKey),s=r.labelDimCache||(r.labelDimCache=[]),l=s[a];if(l!=null)return l;var u=0,h=t.pstyle("font-style").strValue,f=t.pstyle("font-size").pfValue,d=t.pstyle("font-family").strValue,p=t.pstyle("font-weight").strValue,m=this.labelCalcCanvas,g=this.labelCalcCanvasContext;if(!m){m=this.labelCalcCanvas=i.createElement("canvas"),g=this.labelCalcCanvasContext=m.getContext("2d");var y=m.style;y.position="absolute",y.left="-9999px",y.top="-9999px",y.zIndex="-1",y.visibility="hidden",y.pointerEvents="none"}g.font="".concat(h," ").concat(p," ").concat(f,"px ").concat(d);for(var v=0,x=0,b=e.split(` +`),w=0;w1&&arguments[1]!==void 0?arguments[1]:!0;if(e.merge(s),l)for(var u=0;u=t.desktopTapThreshold2}var ot=a(q);at&&(t.hoverData.tapholdCancelled=!0);var Yt=o(function(){var Tt=t.hoverData.dragDelta=t.hoverData.dragDelta||[];Tt.length===0?(Tt.push(De[0]),Tt.push(De[1])):(Tt[0]+=De[0],Tt[1]+=De[1])},"updateDragDelta");ie=!0,i(_e,["mousemove","vmousemove","tapdrag"],q,{x:W[0],y:W[1]});var bt=o(function(){t.data.bgActivePosistion=void 0,t.hoverData.selecting||oe.emit({originalEvent:q,type:"boxstart",position:{x:W[0],y:W[1]}}),Pe[4]=1,t.hoverData.selecting=!0,t.redrawHint("select",!0),t.redraw()},"goIntoBoxMode");if(t.hoverData.which===3){if(at){var Mt={originalEvent:q,type:"cxtdrag",position:{x:W[0],y:W[1]}};Ve?Ve.emit(Mt):oe.emit(Mt),t.hoverData.cxtDragged=!0,(!t.hoverData.cxtOver||_e!==t.hoverData.cxtOver)&&(t.hoverData.cxtOver&&t.hoverData.cxtOver.emit({originalEvent:q,type:"cxtdragout",position:{x:W[0],y:W[1]}}),t.hoverData.cxtOver=_e,_e&&_e.emit({originalEvent:q,type:"cxtdragover",position:{x:W[0],y:W[1]}}))}}else if(t.hoverData.dragging){if(ie=!0,oe.panningEnabled()&&oe.userPanningEnabled()){var xt;if(t.hoverData.justStartedPan){var ut=t.hoverData.mdownPos;xt={x:(W[0]-ut[0])*V,y:(W[1]-ut[1])*V},t.hoverData.justStartedPan=!1}else xt={x:De[0]*V,y:De[1]*V};oe.panBy(xt),oe.emit("dragpan"),t.hoverData.dragged=!0}W=t.projectIntoViewport(q.clientX,q.clientY)}else if(Pe[4]==1&&(Ve==null||Ve.pannable())){if(at){if(!t.hoverData.dragging&&oe.boxSelectionEnabled()&&(ot||!oe.panningEnabled()||!oe.userPanningEnabled()))bt();else if(!t.hoverData.selecting&&oe.panningEnabled()&&oe.userPanningEnabled()){var Et=s(Ve,t.hoverData.downs);Et&&(t.hoverData.dragging=!0,t.hoverData.justStartedPan=!0,Pe[4]=0,t.data.bgActivePosistion=K1(pe),t.redrawHint("select",!0),t.redraw())}Ve&&Ve.pannable()&&Ve.active()&&Ve.unactivate()}}else{if(Ve&&Ve.pannable()&&Ve.active()&&Ve.unactivate(),(!Ve||!Ve.grabbed())&&_e!=be&&(be&&i(be,["mouseout","tapdragout"],q,{x:W[0],y:W[1]}),_e&&i(_e,["mouseover","tapdragover"],q,{x:W[0],y:W[1]}),t.hoverData.last=_e),Ve)if(at){if(oe.boxSelectionEnabled()&&ot)Ve&&Ve.grabbed()&&(x(qe),Ve.emit("freeon"),qe.emit("free"),t.dragData.didDrag&&(Ve.emit("dragfreeon"),qe.emit("dragfree"))),bt();else if(Ve&&Ve.grabbed()&&t.nodeIsDraggable(Ve)){var ft=!t.dragData.didDrag;ft&&t.redrawHint("eles",!0),t.dragData.didDrag=!0,t.hoverData.draggingEles||y(qe,{inDragLayer:!0});var yt={x:0,y:0};if(Ct(De[0])&&Ct(De[1])&&(yt.x+=De[0],yt.y+=De[1],ft)){var nt=t.hoverData.dragDelta;nt&&Ct(nt[0])&&Ct(nt[1])&&(yt.x+=nt[0],yt.y+=nt[1])}t.hoverData.draggingEles=!0,qe.silentShift(yt).emit("position drag"),t.redrawHint("drag",!0),t.redraw()}}else Yt();ie=!0}if(Pe[2]=W[0],Pe[3]=W[1],ie)return q.stopPropagation&&q.stopPropagation(),q.preventDefault&&q.preventDefault(),!1}},"mousemoveHandler"),!1);var k,D,R;t.registerBinding(e,"mouseup",o(function(q){if(!(t.hoverData.which===1&&q.which!==1&&t.hoverData.capture)){var de=t.hoverData.capture;if(de){t.hoverData.capture=!1;var ie=t.cy,oe=t.projectIntoViewport(q.clientX,q.clientY),V=t.selection,we=t.findNearestElement(oe[0],oe[1],!0,!1),W=t.dragData.possibleDragElements,pe=t.hoverData.down,ve=a(q);if(t.data.bgActivePosistion&&(t.redrawHint("select",!0),t.redraw()),t.hoverData.tapholdCancelled=!0,t.data.bgActivePosistion=void 0,pe&&pe.unactivate(),t.hoverData.which===3){var Pe={originalEvent:q,type:"cxttapend",position:{x:oe[0],y:oe[1]}};if(pe?pe.emit(Pe):ie.emit(Pe),!t.hoverData.cxtDragged){var _e={originalEvent:q,type:"cxttap",position:{x:oe[0],y:oe[1]}};pe?pe.emit(_e):ie.emit(_e)}t.hoverData.cxtDragged=!1,t.hoverData.which=null}else if(t.hoverData.which===1){if(i(we,["mouseup","tapend","vmouseup"],q,{x:oe[0],y:oe[1]}),!t.dragData.didDrag&&!t.hoverData.dragged&&!t.hoverData.selecting&&!t.hoverData.isOverThresholdDrag&&(i(pe,["click","tap","vclick"],q,{x:oe[0],y:oe[1]}),D=!1,q.timeStamp-R<=ie.multiClickDebounceTime()?(k&&clearTimeout(k),D=!0,R=null,i(pe,["dblclick","dbltap","vdblclick"],q,{x:oe[0],y:oe[1]})):(k=setTimeout(function(){D||i(pe,["oneclick","onetap","voneclick"],q,{x:oe[0],y:oe[1]})},ie.multiClickDebounceTime()),R=q.timeStamp)),pe==null&&!t.dragData.didDrag&&!t.hoverData.selecting&&!t.hoverData.dragged&&!a(q)&&(ie.$(r).unselect(["tapunselect"]),W.length>0&&t.redrawHint("eles",!0),t.dragData.possibleDragElements=W=ie.collection()),we==pe&&!t.dragData.didDrag&&!t.hoverData.selecting&&we!=null&&we._private.selectable&&(t.hoverData.dragging||(ie.selectionType()==="additive"||ve?we.selected()?we.unselect(["tapunselect"]):we.select(["tapselect"]):ve||(ie.$(r).unmerge(we).unselect(["tapunselect"]),we.select(["tapselect"]))),t.redrawHint("eles",!0)),t.hoverData.selecting){var be=ie.collection(t.getAllInBox(V[0],V[1],V[2],V[3]));t.redrawHint("select",!0),be.length>0&&t.redrawHint("eles",!0),ie.emit({type:"boxend",originalEvent:q,position:{x:oe[0],y:oe[1]}});var Ve=o(function(at){return at.selectable()&&!at.selected()},"eleWouldBeSelected");ie.selectionType()==="additive"||ve||ie.$(r).unmerge(be).unselect(),be.emit("box").stdFilter(Ve).select().emit("boxselect"),t.redraw()}if(t.hoverData.dragging&&(t.hoverData.dragging=!1,t.redrawHint("select",!0),t.redrawHint("eles",!0),t.redraw()),!V[4]){t.redrawHint("drag",!0),t.redrawHint("eles",!0);var De=pe&&pe.grabbed();x(W),De&&(pe.emit("freeon"),W.emit("free"),t.dragData.didDrag&&(pe.emit("dragfreeon"),W.emit("dragfree")))}}V[4]=0,t.hoverData.down=null,t.hoverData.cxtStarted=!1,t.hoverData.draggingEles=!1,t.hoverData.selecting=!1,t.hoverData.isOverThresholdDrag=!1,t.dragData.didDrag=!1,t.hoverData.dragged=!1,t.hoverData.dragDelta=[],t.hoverData.mdownPos=null,t.hoverData.mdownGPos=null,t.hoverData.which=null}}},"mouseupHandler"),!1);var O=o(function(q){if(!t.scrollingPage){var de=t.cy,ie=de.zoom(),oe=de.pan(),V=t.projectIntoViewport(q.clientX,q.clientY),we=[V[0]*ie+oe.x,V[1]*ie+oe.y];if(t.hoverData.draggingEles||t.hoverData.dragging||t.hoverData.cxtStarted||_()){q.preventDefault();return}if(de.panningEnabled()&&de.userPanningEnabled()&&de.zoomingEnabled()&&de.userZoomingEnabled()){q.preventDefault(),t.data.wheelZooming=!0,clearTimeout(t.data.wheelTimeout),t.data.wheelTimeout=setTimeout(function(){t.data.wheelZooming=!1,t.redrawHint("eles",!0),t.redraw()},150);var W;q.deltaY!=null?W=q.deltaY/-250:q.wheelDeltaY!=null?W=q.wheelDeltaY/1e3:W=q.wheelDelta/1e3,W=W*t.wheelSensitivity;var pe=q.deltaMode===1;pe&&(W*=33);var ve=de.zoom()*Math.pow(10,W);q.type==="gesturechange"&&(ve=t.gestureStartZoom*q.scale),de.zoom({level:ve,renderedPosition:{x:we[0],y:we[1]}}),de.emit(q.type==="gesturechange"?"pinchzoom":"scrollzoom")}}},"wheelHandler");t.registerBinding(t.container,"wheel",O,!0),t.registerBinding(e,"scroll",o(function(q){t.scrollingPage=!0,clearTimeout(t.scrollingPageTimeout),t.scrollingPageTimeout=setTimeout(function(){t.scrollingPage=!1},250)},"scrollHandler"),!0),t.registerBinding(t.container,"gesturestart",o(function(q){t.gestureStartZoom=t.cy.zoom(),t.hasTouchStarted||q.preventDefault()},"gestureStartHandler"),!0),t.registerBinding(t.container,"gesturechange",function(xe){t.hasTouchStarted||O(xe)},!0),t.registerBinding(t.container,"mouseout",o(function(q){var de=t.projectIntoViewport(q.clientX,q.clientY);t.cy.emit({originalEvent:q,type:"mouseout",position:{x:de[0],y:de[1]}})},"mouseOutHandler"),!1),t.registerBinding(t.container,"mouseover",o(function(q){var de=t.projectIntoViewport(q.clientX,q.clientY);t.cy.emit({originalEvent:q,type:"mouseover",position:{x:de[0],y:de[1]}})},"mouseOverHandler"),!1);var M,P,B,F,z,$,U,Q,te,Y,he,Z,ue,K=o(function(q,de,ie,oe){return Math.sqrt((ie-q)*(ie-q)+(oe-de)*(oe-de))},"distance"),j=o(function(q,de,ie,oe){return(ie-q)*(ie-q)+(oe-de)*(oe-de)},"distanceSq"),ne;t.registerBinding(t.container,"touchstart",ne=o(function(q){if(t.hasTouchStarted=!0,!!I(q)){w(),t.touchData.capture=!0,t.data.bgActivePosistion=void 0;var de=t.cy,ie=t.touchData.now,oe=t.touchData.earlier;if(q.touches[0]){var V=t.projectIntoViewport(q.touches[0].clientX,q.touches[0].clientY);ie[0]=V[0],ie[1]=V[1]}if(q.touches[1]){var V=t.projectIntoViewport(q.touches[1].clientX,q.touches[1].clientY);ie[2]=V[0],ie[3]=V[1]}if(q.touches[2]){var V=t.projectIntoViewport(q.touches[2].clientX,q.touches[2].clientY);ie[4]=V[0],ie[5]=V[1]}if(q.touches[1]){t.touchData.singleTouchMoved=!0,x(t.dragData.touchDragEles);var we=t.findContainerClientCoords();te=we[0],Y=we[1],he=we[2],Z=we[3],M=q.touches[0].clientX-te,P=q.touches[0].clientY-Y,B=q.touches[1].clientX-te,F=q.touches[1].clientY-Y,ue=0<=M&&M<=he&&0<=B&&B<=he&&0<=P&&P<=Z&&0<=F&&F<=Z;var W=de.pan(),pe=de.zoom();z=K(M,P,B,F),$=j(M,P,B,F),U=[(M+B)/2,(P+F)/2],Q=[(U[0]-W.x)/pe,(U[1]-W.y)/pe];var ve=200,Pe=ve*ve;if($=1){for(var st=t.touchData.startPosition=[null,null,null,null,null,null],Ue=0;Ue=t.touchTapThreshold2}if(de&&t.touchData.cxt){q.preventDefault();var st=q.touches[0].clientX-te,Ue=q.touches[0].clientY-Y,ct=q.touches[1].clientX-te,We=q.touches[1].clientY-Y,ot=j(st,Ue,ct,We),Yt=ot/$,bt=150,Mt=bt*bt,xt=1.5,ut=xt*xt;if(Yt>=ut||ot>=Mt){t.touchData.cxt=!1,t.data.bgActivePosistion=void 0,t.redrawHint("select",!0);var Et={originalEvent:q,type:"cxttapend",position:{x:V[0],y:V[1]}};t.touchData.start?(t.touchData.start.unactivate().emit(Et),t.touchData.start=null):oe.emit(Et)}}if(de&&t.touchData.cxt){var Et={originalEvent:q,type:"cxtdrag",position:{x:V[0],y:V[1]}};t.data.bgActivePosistion=void 0,t.redrawHint("select",!0),t.touchData.start?t.touchData.start.emit(Et):oe.emit(Et),t.touchData.start&&(t.touchData.start._private.grabbed=!1),t.touchData.cxtDragged=!0;var ft=t.findNearestElement(V[0],V[1],!0,!0);(!t.touchData.cxtOver||ft!==t.touchData.cxtOver)&&(t.touchData.cxtOver&&t.touchData.cxtOver.emit({originalEvent:q,type:"cxtdragout",position:{x:V[0],y:V[1]}}),t.touchData.cxtOver=ft,ft&&ft.emit({originalEvent:q,type:"cxtdragover",position:{x:V[0],y:V[1]}}))}else if(de&&q.touches[2]&&oe.boxSelectionEnabled())q.preventDefault(),t.data.bgActivePosistion=void 0,this.lastThreeTouch=+new Date,t.touchData.selecting||oe.emit({originalEvent:q,type:"boxstart",position:{x:V[0],y:V[1]}}),t.touchData.selecting=!0,t.touchData.didSelect=!0,ie[4]=1,!ie||ie.length===0||ie[0]===void 0?(ie[0]=(V[0]+V[2]+V[4])/3,ie[1]=(V[1]+V[3]+V[5])/3,ie[2]=(V[0]+V[2]+V[4])/3+1,ie[3]=(V[1]+V[3]+V[5])/3+1):(ie[2]=(V[0]+V[2]+V[4])/3,ie[3]=(V[1]+V[3]+V[5])/3),t.redrawHint("select",!0),t.redraw();else if(de&&q.touches[1]&&!t.touchData.didSelect&&oe.zoomingEnabled()&&oe.panningEnabled()&&oe.userZoomingEnabled()&&oe.userPanningEnabled()){q.preventDefault(),t.data.bgActivePosistion=void 0,t.redrawHint("select",!0);var yt=t.dragData.touchDragEles;if(yt){t.redrawHint("drag",!0);for(var nt=0;nt0&&!t.hoverData.draggingEles&&!t.swipePanning&&t.data.bgActivePosistion!=null&&(t.data.bgActivePosistion=void 0,t.redrawHint("select",!0),t.redraw())}},"touchmoveHandler"),!1);var ce;t.registerBinding(e,"touchcancel",ce=o(function(q){var de=t.touchData.start;t.touchData.capture=!1,de&&de.unactivate()},"touchcancelHandler"));var le,J,Se,se;if(t.registerBinding(e,"touchend",le=o(function(q){var de=t.touchData.start,ie=t.touchData.capture;if(ie)q.touches.length===0&&(t.touchData.capture=!1),q.preventDefault();else return;var oe=t.selection;t.swipePanning=!1,t.hoverData.draggingEles=!1;var V=t.cy,we=V.zoom(),W=t.touchData.now,pe=t.touchData.earlier;if(q.touches[0]){var ve=t.projectIntoViewport(q.touches[0].clientX,q.touches[0].clientY);W[0]=ve[0],W[1]=ve[1]}if(q.touches[1]){var ve=t.projectIntoViewport(q.touches[1].clientX,q.touches[1].clientY);W[2]=ve[0],W[3]=ve[1]}if(q.touches[2]){var ve=t.projectIntoViewport(q.touches[2].clientX,q.touches[2].clientY);W[4]=ve[0],W[5]=ve[1]}de&&de.unactivate();var Pe;if(t.touchData.cxt){if(Pe={originalEvent:q,type:"cxttapend",position:{x:W[0],y:W[1]}},de?de.emit(Pe):V.emit(Pe),!t.touchData.cxtDragged){var _e={originalEvent:q,type:"cxttap",position:{x:W[0],y:W[1]}};de?de.emit(_e):V.emit(_e)}t.touchData.start&&(t.touchData.start._private.grabbed=!1),t.touchData.cxt=!1,t.touchData.start=null,t.redraw();return}if(!q.touches[2]&&V.boxSelectionEnabled()&&t.touchData.selecting){t.touchData.selecting=!1;var be=V.collection(t.getAllInBox(oe[0],oe[1],oe[2],oe[3]));oe[0]=void 0,oe[1]=void 0,oe[2]=void 0,oe[3]=void 0,oe[4]=0,t.redrawHint("select",!0),V.emit({type:"boxend",originalEvent:q,position:{x:W[0],y:W[1]}});var Ve=o(function(Mt){return Mt.selectable()&&!Mt.selected()},"eleWouldBeSelected");be.emit("box").stdFilter(Ve).select().emit("boxselect"),be.nonempty()&&t.redrawHint("eles",!0),t.redraw()}if(de?.unactivate(),q.touches[2])t.data.bgActivePosistion=void 0,t.redrawHint("select",!0);else if(!q.touches[1]){if(!q.touches[0]){if(!q.touches[0]){t.data.bgActivePosistion=void 0,t.redrawHint("select",!0);var De=t.dragData.touchDragEles;if(de!=null){var qe=de._private.grabbed;x(De),t.redrawHint("drag",!0),t.redrawHint("eles",!0),qe&&(de.emit("freeon"),De.emit("free"),t.dragData.didDrag&&(de.emit("dragfreeon"),De.emit("dragfree"))),i(de,["touchend","tapend","vmouseup","tapdragout"],q,{x:W[0],y:W[1]}),de.unactivate(),t.touchData.start=null}else{var at=t.findNearestElement(W[0],W[1],!0,!0);i(at,["touchend","tapend","vmouseup","tapdragout"],q,{x:W[0],y:W[1]})}var Lt=t.touchData.startPosition[0]-W[0],st=Lt*Lt,Ue=t.touchData.startPosition[1]-W[1],ct=Ue*Ue,We=st+ct,ot=We*we*we;t.touchData.singleTouchMoved||(de||V.$(":selected").unselect(["tapunselect"]),i(de,["tap","vclick"],q,{x:W[0],y:W[1]}),J=!1,q.timeStamp-se<=V.multiClickDebounceTime()?(Se&&clearTimeout(Se),J=!0,se=null,i(de,["dbltap","vdblclick"],q,{x:W[0],y:W[1]})):(Se=setTimeout(function(){J||i(de,["onetap","voneclick"],q,{x:W[0],y:W[1]})},V.multiClickDebounceTime()),se=q.timeStamp)),de!=null&&!t.dragData.didDrag&&de._private.selectable&&ot"u"){var ae=[],Oe=o(function(q){return{clientX:q.clientX,clientY:q.clientY,force:1,identifier:q.pointerId,pageX:q.pageX,pageY:q.pageY,radiusX:q.width/2,radiusY:q.height/2,screenX:q.screenX,screenY:q.screenY,target:q.target}},"makeTouch"),ye=o(function(q){return{event:q,touch:Oe(q)}},"makePointer"),Be=o(function(q){ae.push(ye(q))},"addPointer"),He=o(function(q){for(var de=0;de0)return U[0]}return null},"getCurveT"),g=Object.keys(p),y=0;y0?m:pme(a,s,e,r,n,i,l,u)},"intersectLine"),checkPoint:o(function(e,r,n,i,a,s,l,u){u=u==="auto"?jp(i,a):u;var h=2*u;if(rh(e,r,this.points,s,l,i,a-h,[0,-1],n)||rh(e,r,this.points,s,l,i-h,a,[0,-1],n))return!0;var f=i/2+2*n,d=a/2+2*n,p=[s-f,l-d,s-f,l,s+f,l,s+f,l-d];return!!(Ws(e,r,p)||qp(e,r,h,h,s+i/2-u,l+a/2-u,n)||qp(e,r,h,h,s-i/2+u,l+a/2-u,n))},"checkPoint")}};ih.registerNodeShapes=function(){var t=this.nodeShapes={},e=this;this.generateEllipse(),this.generatePolygon("triangle",ys(3,0)),this.generateRoundPolygon("round-triangle",ys(3,0)),this.generatePolygon("rectangle",ys(4,0)),t.square=t.rectangle,this.generateRoundRectangle(),this.generateCutRectangle(),this.generateBarrel(),this.generateBottomRoundrectangle();{var r=[0,1,1,0,0,-1,-1,0];this.generatePolygon("diamond",r),this.generateRoundPolygon("round-diamond",r)}this.generatePolygon("pentagon",ys(5,0)),this.generateRoundPolygon("round-pentagon",ys(5,0)),this.generatePolygon("hexagon",ys(6,0)),this.generateRoundPolygon("round-hexagon",ys(6,0)),this.generatePolygon("heptagon",ys(7,0)),this.generateRoundPolygon("round-heptagon",ys(7,0)),this.generatePolygon("octagon",ys(8,0)),this.generateRoundPolygon("round-octagon",ys(8,0));var n=new Array(20);{var i=$P(5,0),a=$P(5,Math.PI/5),s=.5*(3-Math.sqrt(5));s*=1.57;for(var l=0;l=e.deqFastCost*C)break}else if(h){if(b>=e.deqCost*m||b>=e.deqAvgCost*p)break}else if(w>=e.deqNoDrawCost*NP)break;var T=e.deq(n,v,y);if(T.length>0)for(var E=0;E0&&(e.onDeqd(n,g),!h&&e.shouldRedraw(n,g,v,y)&&a())},"dequeue"),l=e.priority||aB;i.beforeRender(s,l(n))}},"setupDequeueingImpl")},"setupDequeueing")},TQe=function(){function t(e){var r=arguments.length>1&&arguments[1]!==void 0?arguments[1]:C6;$f(this,t),this.idsByKey=new Zc,this.keyForId=new Zc,this.cachesByLvl=new Zc,this.lvls=[],this.getKey=e,this.doesEleInvalidateKey=r}return o(t,"ElementTextureCacheLookup"),zf(t,[{key:"getIdsFor",value:o(function(r){r==null&&ai("Can not get id list for null key");var n=this.idsByKey,i=this.idsByKey.get(r);return i||(i=new sy,n.set(r,i)),i},"getIdsFor")},{key:"addIdForKey",value:o(function(r,n){r!=null&&this.getIdsFor(r).add(n)},"addIdForKey")},{key:"deleteIdForKey",value:o(function(r,n){r!=null&&this.getIdsFor(r).delete(n)},"deleteIdForKey")},{key:"getNumberOfIdsForKey",value:o(function(r){return r==null?0:this.getIdsFor(r).size},"getNumberOfIdsForKey")},{key:"updateKeyMappingFor",value:o(function(r){var n=r.id(),i=this.keyForId.get(n),a=this.getKey(r);this.deleteIdForKey(i,n),this.addIdForKey(a,n),this.keyForId.set(n,a)},"updateKeyMappingFor")},{key:"deleteKeyMappingFor",value:o(function(r){var n=r.id(),i=this.keyForId.get(n);this.deleteIdForKey(i,n),this.keyForId.delete(n)},"deleteKeyMappingFor")},{key:"keyHasChangedFor",value:o(function(r){var n=r.id(),i=this.keyForId.get(n),a=this.getKey(r);return i!==a},"keyHasChangedFor")},{key:"isInvalid",value:o(function(r){return this.keyHasChangedFor(r)||this.doesEleInvalidateKey(r)},"isInvalid")},{key:"getCachesAt",value:o(function(r){var n=this.cachesByLvl,i=this.lvls,a=n.get(r);return a||(a=new Zc,n.set(r,a),i.push(r)),a},"getCachesAt")},{key:"getCache",value:o(function(r,n){return this.getCachesAt(n).get(r)},"getCache")},{key:"get",value:o(function(r,n){var i=this.getKey(r),a=this.getCache(i,n);return a!=null&&this.updateKeyMappingFor(r),a},"get")},{key:"getForCachedKey",value:o(function(r,n){var i=this.keyForId.get(r.id()),a=this.getCache(i,n);return a},"getForCachedKey")},{key:"hasCache",value:o(function(r,n){return this.getCachesAt(n).has(r)},"hasCache")},{key:"has",value:o(function(r,n){var i=this.getKey(r);return this.hasCache(i,n)},"has")},{key:"setCache",value:o(function(r,n,i){i.key=r,this.getCachesAt(n).set(r,i)},"setCache")},{key:"set",value:o(function(r,n,i){var a=this.getKey(r);this.setCache(a,n,i),this.updateKeyMappingFor(r)},"set")},{key:"deleteCache",value:o(function(r,n){this.getCachesAt(n).delete(r)},"deleteCache")},{key:"delete",value:o(function(r,n){var i=this.getKey(r);this.deleteCache(i,n)},"_delete")},{key:"invalidateKey",value:o(function(r){var n=this;this.lvls.forEach(function(i){return n.deleteCache(r,i)})},"invalidateKey")},{key:"invalidate",value:o(function(r){var n=r.id(),i=this.keyForId.get(n);this.deleteKeyMappingFor(r);var 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0?arguments[0]:p,V=(L>0?L:-L)*oe,we=L>0?0:255;L!==0&&(s.colorFillStyle(t,we,we,we,V),m?t.fill(g):t.fill())},"darken"),Oe=o(function(){if(k>0){if(t.lineWidth=k,t.lineCap=P,t.lineJoin=M,t.setLineDash)switch(O){case"dotted":t.setLineDash([1,1]);break;case"dashed":t.setLineDash(F),t.lineDashOffset=z;break;case"solid":case"double":t.setLineDash([]);break}if(B!=="center"){if(t.save(),t.lineWidth*=2,B==="inside")m?t.clip(g):t.clip();else{var oe=new Path2D;oe.rect(-l/2-k,-u/2-k,l+2*k,u+2*k),oe.addPath(g),t.clip(oe,"evenodd")}m?t.stroke(g):t.stroke(),t.restore()}else m?t.stroke(g):t.stroke();if(O==="double"){t.lineWidth=k/3;var V=t.globalCompositeOperation;t.globalCompositeOperation="destination-out",m?t.stroke(g):t.stroke(),t.globalCompositeOperation=V}t.setLineDash&&t.setLineDash([])}},"drawBorder"),ye=o(function(){if(U>0){if(t.lineWidth=U,t.lineCap="butt",t.setLineDash)switch(te){case"dotted":t.setLineDash([1,1]);break;case"dashed":t.setLineDash([4,2]);break;case"solid":case"double":t.setLineDash([]);break}var oe=d;m&&(oe={x:0,y:0});var V=s.getNodeShape(e),we=k;B==="inside"&&(we=0),B==="outside"&&(we*=2);var W=(l+we+(U+he))/l,pe=(u+we+(U+he))/u,ve=l*W,Pe=u*pe,_e=s.nodeShapes[V].points,be;if(m){var Ve=ne(ve,Pe,V,_e);be=Ve.path}if(V==="ellipse")s.drawEllipsePath(be||t,oe.x,oe.y,ve,Pe);else if(["round-diamond","round-heptagon","round-hexagon","round-octagon","round-pentagon","round-polygon","round-triangle","round-tag"].includes(V)){var De=0,qe=0,at=0;V==="round-diamond"?De=(we+he+U)*1.4:V==="round-heptagon"?(De=(we+he+U)*1.075,at=-(we/2+he+U)/35):V==="round-hexagon"?De=(we+he+U)*1.12:V==="round-pentagon"?(De=(we+he+U)*1.13,at=-(we/2+he+U)/15):V==="round-tag"?(De=(we+he+U)*1.12,qe=(we/2+U+he)*.07):V==="round-triangle"&&(De=(we+he+U)*(Math.PI/2),at=-(we+he/2+U)/Math.PI),De!==0&&(W=(l+De)/l,ve=l*W,["round-hexagon","round-tag"].includes(V)||(pe=(u+De)/u,Pe=u*pe)),Z=Z==="auto"?gme(ve,Pe):Z;for(var Lt=ve/2,st=Pe/2,Ue=Z+(we+U+he)/2,ct=new Array(_e.length/2),We=new Array(_e.length/2),ot=0;ot<_e.length/2;ot++)ct[ot]={x:oe.x+qe+Lt*_e[ot*2],y:oe.y+at+st*_e[ot*2+1]};var Yt,bt,Mt,xt,ut=ct.length;for(bt=ct[ut-1],Yt=0;Yt0){if(i=i||n.position(),a==null||s==null){var m=n.padding();a=n.width()+2*m,s=n.height()+2*m}l.colorFillStyle(r,f[0],f[1],f[2],h),l.nodeShapes[d].draw(r,i.x,i.y,a+u*2,s+u*2,p),r.fill()}}}},"drawNodeOverlayUnderlay");my.drawNodeOverlay=bge("overlay");my.drawNodeUnderlay=bge("underlay");my.hasPie=function(t){return t=t[0],t._private.hasPie};my.drawPie=function(t,e,r,n){e=e[0],n=n||e.position();var i=e.cy().style(),a=e.pstyle("pie-size"),s=n.x,l=n.y,u=e.width(),h=e.height(),f=Math.min(u,h)/2,d=0,p=this.usePaths();p&&(s=0,l=0),a.units==="%"?f=f*a.pfValue:a.pfValue!==void 0&&(f=a.pfValue/2);for(var m=1;m<=i.pieBackgroundN;m++){var g=e.pstyle("pie-"+m+"-background-size").value,y=e.pstyle("pie-"+m+"-background-color").value,v=e.pstyle("pie-"+m+"-background-opacity").value*r,x=g/100;x+d>1&&(x=1-d);var b=1.5*Math.PI+2*Math.PI*d,w=2*Math.PI*x,C=b+w;g===0||d>=1||d+x>1||(t.beginPath(),t.moveTo(s,l),t.arc(s,l,f,b,C),t.closePath(),this.colorFillStyle(t,y[0],y[1],y[2],v),t.fill(),d+=x)}};vs={},iZe=100;vs.getPixelRatio=function(){var t=this.data.contexts[0];if(this.forcedPixelRatio!=null)return this.forcedPixelRatio;var e=this.cy.window(),r=t.backingStorePixelRatio||t.webkitBackingStorePixelRatio||t.mozBackingStorePixelRatio||t.msBackingStorePixelRatio||t.oBackingStorePixelRatio||t.backingStorePixelRatio||1;return(e.devicePixelRatio||1)/r};vs.paintCache=function(t){for(var e=this.paintCaches=this.paintCaches||[],r=!0,n,i=0;ie.minMbLowQualFrames&&(e.motionBlurPxRatio=e.mbPxRBlurry)),e.clearingMotionBlur&&(e.motionBlurPxRatio=1),e.textureDrawLastFrame&&!d&&(f[e.NODE]=!0,f[e.SELECT_BOX]=!0);var b=r.style(),w=r.zoom(),C=s!==void 0?s:w,T=r.pan(),E={x:T.x,y:T.y},A={zoom:w,pan:{x:T.x,y:T.y}},S=e.prevViewport,_=S===void 0||A.zoom!==S.zoom||A.pan.x!==S.pan.x||A.pan.y!==S.pan.y;!_&&!(y&&!g)&&(e.motionBlurPxRatio=1),l&&(E=l),C*=u,E.x*=u,E.y*=u;var I=e.getCachedZSortedEles();function L(K,j,ne,ee,ce){var le=K.globalCompositeOperation;K.globalCompositeOperation="destination-out",e.colorFillStyle(K,255,255,255,e.motionBlurTransparency),K.fillRect(j,ne,ee,ce),K.globalCompositeOperation=le}o(L,"mbclear");function k(K,j){var ne,ee,ce,le;!e.clearingMotionBlur&&(K===h.bufferContexts[e.MOTIONBLUR_BUFFER_NODE]||K===h.bufferContexts[e.MOTIONBLUR_BUFFER_DRAG])?(ne={x:T.x*m,y:T.y*m},ee=w*m,ce=e.canvasWidth*m,le=e.canvasHeight*m):(ne=E,ee=C,ce=e.canvasWidth,le=e.canvasHeight),K.setTransform(1,0,0,1,0,0),j==="motionBlur"?L(K,0,0,ce,le):!n&&(j===void 0||j)&&K.clearRect(0,0,ce,le),i||(K.translate(ne.x,ne.y),K.scale(ee,ee)),l&&K.translate(l.x,l.y),s&&K.scale(s,s)}if(o(k,"setContextTransform"),d||(e.textureDrawLastFrame=!1),d){if(e.textureDrawLastFrame=!0,!e.textureCache){e.textureCache={},e.textureCache.bb=r.mutableElements().boundingBox(),e.textureCache.texture=e.data.bufferCanvases[e.TEXTURE_BUFFER];var D=e.data.bufferContexts[e.TEXTURE_BUFFER];D.setTransform(1,0,0,1,0,0),D.clearRect(0,0,e.canvasWidth*e.textureMult,e.canvasHeight*e.textureMult),e.render({forcedContext:D,drawOnlyNodeLayer:!0,forcedPxRatio:u*e.textureMult});var A=e.textureCache.viewport={zoom:r.zoom(),pan:r.pan(),width:e.canvasWidth,height:e.canvasHeight};A.mpan={x:(0-A.pan.x)/A.zoom,y:(0-A.pan.y)/A.zoom}}f[e.DRAG]=!1,f[e.NODE]=!1;var R=h.contexts[e.NODE],O=e.textureCache.texture,A=e.textureCache.viewport;R.setTransform(1,0,0,1,0,0),p?L(R,0,0,A.width,A.height):R.clearRect(0,0,A.width,A.height);var M=b.core("outside-texture-bg-color").value,P=b.core("outside-texture-bg-opacity").value;e.colorFillStyle(R,M[0],M[1],M[2],P),R.fillRect(0,0,A.width,A.height);var w=r.zoom();k(R,!1),R.clearRect(A.mpan.x,A.mpan.y,A.width/A.zoom/u,A.height/A.zoom/u),R.drawImage(O,A.mpan.x,A.mpan.y,A.width/A.zoom/u,A.height/A.zoom/u)}else e.textureOnViewport&&!n&&(e.textureCache=null);var B=r.extent(),F=e.pinching||e.hoverData.dragging||e.swipePanning||e.data.wheelZooming||e.hoverData.draggingEles||e.cy.animated(),z=e.hideEdgesOnViewport&&F,$=[];if($[e.NODE]=!f[e.NODE]&&p&&!e.clearedForMotionBlur[e.NODE]||e.clearingMotionBlur,$[e.NODE]&&(e.clearedForMotionBlur[e.NODE]=!0),$[e.DRAG]=!f[e.DRAG]&&p&&!e.clearedForMotionBlur[e.DRAG]||e.clearingMotionBlur,$[e.DRAG]&&(e.clearedForMotionBlur[e.DRAG]=!0),f[e.NODE]||i||a||$[e.NODE]){var U=p&&!$[e.NODE]&&m!==1,R=n||(U?e.data.bufferContexts[e.MOTIONBLUR_BUFFER_NODE]:h.contexts[e.NODE]),Q=p&&!U?"motionBlur":void 0;k(R,Q),z?e.drawCachedNodes(R,I.nondrag,u,B):e.drawLayeredElements(R,I.nondrag,u,B),e.debug&&e.drawDebugPoints(R,I.nondrag),!i&&!p&&(f[e.NODE]=!1)}if(!a&&(f[e.DRAG]||i||$[e.DRAG])){var U=p&&!$[e.DRAG]&&m!==1,R=n||(U?e.data.bufferContexts[e.MOTIONBLUR_BUFFER_DRAG]:h.contexts[e.DRAG]);k(R,p&&!U?"motionBlur":void 0),z?e.drawCachedNodes(R,I.drag,u,B):e.drawCachedElements(R,I.drag,u,B),e.debug&&e.drawDebugPoints(R,I.drag),!i&&!p&&(f[e.DRAG]=!1)}if(this.drawSelectionRectangle(t,k),p&&m!==1){var te=h.contexts[e.NODE],Y=e.data.bufferCanvases[e.MOTIONBLUR_BUFFER_NODE],he=h.contexts[e.DRAG],Z=e.data.bufferCanvases[e.MOTIONBLUR_BUFFER_DRAG],ue=o(function(j,ne,ee){j.setTransform(1,0,0,1,0,0),ee||!x?j.clearRect(0,0,e.canvasWidth,e.canvasHeight):L(j,0,0,e.canvasWidth,e.canvasHeight);var ce=m;j.drawImage(ne,0,0,e.canvasWidth*ce,e.canvasHeight*ce,0,0,e.canvasWidth,e.canvasHeight)},"drawMotionBlur");(f[e.NODE]||$[e.NODE])&&(ue(te,Y,$[e.NODE]),f[e.NODE]=!1),(f[e.DRAG]||$[e.DRAG])&&(ue(he,Z,$[e.DRAG]),f[e.DRAG]=!1)}e.prevViewport=A,e.clearingMotionBlur&&(e.clearingMotionBlur=!1,e.motionBlurCleared=!0,e.motionBlur=!0),p&&(e.motionBlurTimeout=setTimeout(function(){e.motionBlurTimeout=null,e.clearedForMotionBlur[e.NODE]=!1,e.clearedForMotionBlur[e.DRAG]=!1,e.motionBlur=!1,e.clearingMotionBlur=!d,e.mbFrames=0,f[e.NODE]=!0,f[e.DRAG]=!0,e.redraw()},iZe)),n||r.emit("render")};vs.drawSelectionRectangle=function(t,e){var r=this,n=r.cy,i=r.data,a=n.style(),s=t.drawOnlyNodeLayer,l=t.drawAllLayers,u=i.canvasNeedsRedraw,h=t.forcedContext;if(r.showFps||!s&&u[r.SELECT_BOX]&&!l){var f=h||i.contexts[r.SELECT_BOX];if(e(f),r.selection[4]==1&&(r.hoverData.selecting||r.touchData.selecting)){var d=r.cy.zoom(),p=a.core("selection-box-border-width").value/d;f.lineWidth=p,f.fillStyle="rgba("+a.core("selection-box-color").value[0]+","+a.core("selection-box-color").value[1]+","+a.core("selection-box-color").value[2]+","+a.core("selection-box-opacity").value+")",f.fillRect(r.selection[0],r.selection[1],r.selection[2]-r.selection[0],r.selection[3]-r.selection[1]),p>0&&(f.strokeStyle="rgba("+a.core("selection-box-border-color").value[0]+","+a.core("selection-box-border-color").value[1]+","+a.core("selection-box-border-color").value[2]+","+a.core("selection-box-opacity").value+")",f.strokeRect(r.selection[0],r.selection[1],r.selection[2]-r.selection[0],r.selection[3]-r.selection[1]))}if(i.bgActivePosistion&&!r.hoverData.selecting){var d=r.cy.zoom(),m=i.bgActivePosistion;f.fillStyle="rgba("+a.core("active-bg-color").value[0]+","+a.core("active-bg-color").value[1]+","+a.core("active-bg-color").value[2]+","+a.core("active-bg-opacity").value+")",f.beginPath(),f.arc(m.x,m.y,a.core("active-bg-size").pfValue/d,0,2*Math.PI),f.fill()}var g=r.lastRedrawTime;if(r.showFps&&g){g=Math.round(g);var y=Math.round(1e3/g),v="1 frame = "+g+" ms = "+y+" fps";if(f.setTransform(1,0,0,1,0,0),f.fillStyle="rgba(255, 0, 0, 0.75)",f.strokeStyle="rgba(255, 0, 0, 0.75)",f.font="30px Arial",!$b){var x=f.measureText(v);$b=x.actualBoundingBoxAscent}f.fillText(v,0,$b);var b=60;f.strokeRect(0,$b+10,250,20),f.fillRect(0,$b+10,250*Math.min(y/b,1),20)}l||(u[r.SELECT_BOX]=!1)}};o(P0e,"compileShader");o(aZe,"createProgram");o(sZe,"createTextureCanvas");o(EB,"getEffectivePanZoom");o(OP,"modelToRenderedPosition");o(d6,"toWebGLColor");o(p6,"indexToVec4");o(oZe,"vec4ToIndex");o(lZe,"createTexture");o(wge,"getTypeInfo");o(Tge,"createTypedArray");o(cZe,"createTypedArrayView");o(uZe,"createBufferStaticDraw");o(go,"createBufferDynamicDraw");o(hZe,"createPickingFrameBuffer");B0e=typeof Float32Array<"u"?Float32Array:Array;Math.hypot||(Math.hypot=function(){for(var t=0,e=arguments.length;e--;)t+=arguments[e]*arguments[e];return Math.sqrt(t)});o(Xb,"create");o(kge,"identity");o(fZe,"multiply");o(O6,"translate");o(Ege,"rotate");o(SB,"scale");o(dZe,"projection");jb={SCREEN:{name:"screen",screen:!0},PICKING:{name:"picking",picking:!0}},zb=la({getKey:null,drawElement:null,getBoundingBox:null,getRotation:null,getRotationPoint:null,getRotationOffset:null,isVisible:null,getPadding:null}),pZe=function(){function t(e,r){$f(this,t),this.debugID=Math.floor(Math.random()*1e4),this.r=e,this.atlasSize=r.webglTexSize,this.rows=r.webglTexRows,this.enableWrapping=r.enableWrapping,this.texHeight=Math.floor(this.atlasSize/this.rows),this.maxTexWidth=this.atlasSize,this.texture=null,this.canvas=null,this.needsBuffer=!0,this.freePointer={x:0,row:0},this.keyToLocation=new Map,this.canvas=r.createTextureCanvas(e,this.atlasSize,this.atlasSize),this.scratch=r.createTextureCanvas(e,this.atlasSize,this.texHeight,"scratch")}return o(t,"Atlas"),zf(t,[{key:"getKeys",value:o(function(){return new Set(this.keyToLocation.keys())},"getKeys")},{key:"getScale",value:o(function(r){var n=r.w,i=r.h,a=this.texHeight,s=this.maxTexWidth,l=a/i,u=n*l,h=i*l;return u>s&&(l=s/n,u=n*l,h=i*l),{scale:l,texW:u,texH:h}},"getScale")},{key:"draw",value:o(function(r,n,i){var a=this,s=this.atlasSize,l=this.rows,u=this.texHeight,h=this.getScale(n),f=h.scale,d=h.texW,p=h.texH,m=[null,null],g=o(function(w,C){if(i&&C){var T=C.context,E=w.x,A=w.row,S=E,_=u*A;T.save(),T.translate(S,_),T.scale(f,f),i(T,n),T.restore()}},"drawAt"),y=o(function(){g(a.freePointer,a.canvas),m[0]={x:a.freePointer.x,y:a.freePointer.row*u,w:d,h:p},m[1]={x:a.freePointer.x+d,y:a.freePointer.row*u,w:0,h:p},a.freePointer.x+=d,a.freePointer.x==s&&(a.freePointer.x=0,a.freePointer.row++)},"drawNormal"),v=o(function(){var w=a.scratch,C=a.canvas;w.clear(),g({x:0,row:0},w);var T=s-a.freePointer.x,E=d-T,A=u;{var S=a.freePointer.x,_=a.freePointer.row*u,I=T;C.context.drawImage(w,0,0,I,A,S,_,I,A),m[0]={x:S,y:_,w:I,h:p}}{var L=T,k=(a.freePointer.row+1)*u,D=E;C&&C.context.drawImage(w,L,0,D,A,0,k,D,A),m[1]={x:0,y:k,w:D,h:p}}a.freePointer.x=E,a.freePointer.row++},"drawWrapped"),x=o(function(){a.freePointer.x=0,a.freePointer.row++},"moveToStartOfNextRow");if(this.freePointer.x+d<=s)y();else{if(this.freePointer.row>=l-1)return!1;this.freePointer.x===s?(x(),y()):this.enableWrapping?v():(x(),y())}return this.keyToLocation.set(r,m),this.needsBuffer=!0,m},"draw")},{key:"getOffsets",value:o(function(r){return this.keyToLocation.get(r)},"getOffsets")},{key:"isEmpty",value:o(function(){return this.freePointer.x===0&&this.freePointer.row===0},"isEmpty")},{key:"canFit",value:o(function(r){var n=this.atlasSize,i=this.rows,a=this.getScale(r),s=a.texW;return this.freePointer.x+s>n?this.freePointer.row1&&arguments[1]!==void 0?arguments[1]:{},i=n.forceRedraw,a=i===void 0?!1:i,s=n.filterEle,l=s===void 0?function(){return!0}:s,u=n.filterType,h=u===void 0?function(){return!0}:u,f=!1,d=yo(r),p;try{for(d.s();!(p=d.n()).done;){var m=p.value;if(l(m)){var g=m.id(),y=yo(this.getRenderTypes()),v;try{for(y.s();!(v=y.n()).done;){var x=v.value;if(h(x.type)){var b=x.getKey(m);a?(x.atlasCollection.deleteKey(g,b),x.atlasCollection.styleKeyNeedsRedraw.add(b),f=!0):f|=x.atlasCollection.checkKeyIsInvalid(g,b)}}}catch(w){y.e(w)}finally{y.f()}}}}catch(w){d.e(w)}finally{d.f()}return f},"invalidate")},{key:"gc",value:o(function(){var r=yo(this.getRenderTypes()),n;try{for(r.s();!(n=r.n()).done;){var i=n.value;i.atlasCollection.gc()}}catch(a){r.e(a)}finally{r.f()}},"gc")},{key:"isRenderable",value:o(function(r,n){var i=this.getRenderTypeOpts(n);return i&&i.isVisible(r)},"isRenderable")},{key:"startBatch",value:o(function(){this.batchAtlases=[]},"startBatch")},{key:"getAtlasCount",value:o(function(){return this.batchAtlases.length},"getAtlasCount")},{key:"getAtlases",value:o(function(){return this.batchAtlases},"getAtlases")},{key:"getOrCreateAtlas",value:o(function(r,n,i){var a=this.renderTypes.get(i),s=a.getKey(r),l=r.id();return a.atlasCollection.draw(l,s,n,function(u){a.drawElement(u,r,n,!0,!0)})},"getOrCreateAtlas")},{key:"getAtlasIndexForBatch",value:o(function(r){var n=this.batchAtlases.indexOf(r);if(n<0){if(this.batchAtlases.length===this.maxAtlasesPerBatch)return;this.batchAtlases.push(r),n=this.batchAtlases.length-1}return n},"getAtlasIndexForBatch")},{key:"getIndexArray",value:o(function(){return Array.from({length:this.maxAtlases},function(r,n){return n})},"getIndexArray")},{key:"getAtlasInfo",value:o(function(r,n){var i=this.renderTypes.get(n),a=i.getBoundingBox(r),s=this.getOrCreateAtlas(r,a,n),l=this.getAtlasIndexForBatch(s);if(l!==void 0){var u=i.getKey(r),h=s.getOffsets(u),f=Di(h,2),d=f[0],p=f[1];return{atlasID:l,tex:d,tex1:d,tex2:p,bb:a,type:n,styleKey:u}}},"getAtlasInfo")},{key:"canAddToCurrentBatch",value:o(function(r,n){if(this.batchAtlases.length===this.maxAtlasesPerBatch){var i=this.renderTypes.get(n),a=i.getKey(r),s=i.atlasCollection.getAtlas(a);return s&&this.batchAtlases.includes(s)}return!0},"canAddToCurrentBatch")},{key:"setTransformMatrix",value:o(function(r,n,i){var a=arguments.length>3&&arguments[3]!==void 0?arguments[3]:!0,s=n.bb,l=n.type,u=n.tex1,h=n.tex2,f=this.getRenderTypeOpts(l),d=f.getPadding?f.getPadding(i):0,p=u.w/(u.w+h.w);a||(p=1-p);var m=this.getAdjustedBB(s,d,a,p),g,y;kge(r);var v=f.getRotation?f.getRotation(i):0;if(v!==0){var x=f.getRotationPoint(i),b=x.x,w=x.y;O6(r,r,[b,w]),Ege(r,r,v);var C=f.getRotationOffset(i);g=C.x+m.xOffset,y=C.y}else g=m.x1,y=m.y1;O6(r,r,[g,y]),SB(r,r,[m.w,m.h])},"setTransformMatrix")},{key:"getTransformMatrix",value:o(function(r,n){var i=arguments.length>2&&arguments[2]!==void 0?arguments[2]:!0,a=Xb();return this.setTransformMatrix(a,r,n,i),a},"getTransformMatrix")},{key:"getAdjustedBB",value:o(function(r,n,i,a){var s=r.x1,l=r.y1,u=r.w,h=r.h;n&&(s-=n,l-=n,u+=2*n,h+=2*n);var f=0,d=u*a;return 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o(t,"ElementDrawingWebGL"),zf(t,[{key:"addTextureRenderType",value:o(function(r,n){this.atlasManager.addRenderType(r,n)},"addTextureRenderType")},{key:"invalidate",value:o(function(r){var n=arguments.length>1&&arguments[1]!==void 0?arguments[1]:{},i=n.type,a=this.atlasManager;return i?a.invalidate(r,{filterType:o(function(l){return l===i},"filterType"),forceRedraw:!0}):a.invalidate(r)},"invalidate")},{key:"gc",value:o(function(){this.atlasManager.gc()},"gc")},{key:"createShaderProgram",value:o(function(r){var n=this.gl,i=`#version 300 es precision highp float; uniform mat3 uPanZoomMatrix; @@ -1991,7 +2018,7 @@ In order to be iterable, non-array objects must have a [Symbol.iterator]() metho int vid = gl_VertexID; vec2 position = aPosition; - if(aVertType == `.concat(MP,`) { + if(aVertType == `.concat(PP,`) { float texX; float texY; float texW; @@ -2033,7 +2060,7 @@ In order to be iterable, non-array objects must have a [Symbol.iterator]() metho gl_Position = vec4(uPanZoomMatrix * texMatrix * vec3(position, 1.0), 1.0); } - else if(aVertType == `).concat(V0e,` && vid < 6) { + else if(aVertType == `).concat(F0e,` && vid < 6) { vec2 source = aPointAPointB.xy; vec2 target = aPointAPointB.zw; @@ -2047,7 +2074,7 @@ In order to be iterable, non-array objects must have a [Symbol.iterator]() metho gl_Position = vec4(uPanZoomMatrix * vec3(point, 1.0), 1.0); vEdgeColor = aEdgeColor; } - else if(aVertType == `).concat(U0e,` && vid < 6) { + else if(aVertType == `).concat($0e,` && vid < 6) { vec2 pointA = aPointAPointB.xy; vec2 pointB = aPointAPointB.zw; vec2 pointC = aPointCPointD.xy; @@ -2094,7 +2121,7 @@ In order to be iterable, non-array objects must have a [Symbol.iterator]() metho vEdgeColor = aEdgeColor; } - else if(aVertType == `).concat(IP,` && vid < 3) { + else if(aVertType == `).concat(BP,` && vid < 3) { // massage the first triangle into an edge arrow if(vid == 0) position = vec2(-0.15, -0.3); @@ -2136,10 +2163,10 @@ In order to be iterable, non-array objects must have a [Symbol.iterator]() metho out vec4 outColor; void main(void) { - if(vVertType == `).concat(MP,`) { + if(vVertType == `).concat(PP,`) { `).concat(a.map(function(h){return"if(vAtlasId == ".concat(h,") outColor = texture(uTexture").concat(h,", vTexCoord);")}).join(` else `),` - } else if(vVertType == `).concat(IP,`) { + } else if(vVertType == `).concat(BP,`) { // blend arrow color with background (using premultiplied alpha) outColor.rgb = vEdgeColor.rgb + (uBGColor.rgb * (1.0 - vEdgeColor.a)); outColor.a = 1.0; // make opaque, masks out line under arrow @@ -2150,7 +2177,7 @@ In order to be iterable, non-array objects must have a [Symbol.iterator]() metho `).concat(r.picking?`if(outColor.a == 0.0) discard; else outColor = vIndex;`:"",` } - 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0?arguments[2]:Vb.SCREEN;this.panZoomMatrix=r,this.debugInfo=n,this.renderTarget=i,this.startBatch()},"startFrame")},{key:"startBatch",value:o(function(){this.instanceCount=0,this.atlasManager.startBatch()},"startBatch")},{key:"endFrame",value:o(function(){this.endBatch()},"endFrame")},{key:"getTempMatrix",value:o(function(){return this.tempMatrix=this.tempMatrix||Gb()},"getTempMatrix")},{key:"drawTexture",value:o(function(r,n,i){var a=this.atlasManager;if(a.isRenderable(r,i)){a.canAddToCurrentBatch(r,i)||this.endBatch();var s=this.instanceCount;this.vertTypeBuffer.getView(s)[0]=MP;var l=this.indexBuffer.getView(s);lS(n,l);var u=a.getAtlasInfo(r,i,u),h=u.atlasID,f=u.tex1,d=u.tex2,p=this.atlasIdBuffer.getView(s);p[0]=h;var m=this.tex1Buffer.getView(s);m[0]=f.x,m[1]=f.y,m[2]=f.w,m[3]=f.h;var g=this.tex2Buffer.getView(s);g[0]=d.x,g[1]=d.y,g[2]=d.w,g[3]=d.h;for(var 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E=this.translate1Buffer.getView(b);E[0]=x[6],E[1]=x[7],this.instanceCount++,this.instanceCount>=this.maxInstances&&this.endBatch()}}},"drawEdgeArrow")},{key:"drawEdgeLine",value:o(function(r,n){var i=r.pstyle("opacity").value,a=r.pstyle("line-opacity").value,s=r.pstyle("width").pfValue,l=r.pstyle("line-color").value,u=i*a,h=this.getEdgePoints(r);if(h.length/2+this.instanceCount>this.maxInstances&&this.endBatch(),h.length==4){var f=this.instanceCount;this.vertTypeBuffer.getView(f)[0]=V0e;var d=this.indexBuffer.getView(f);lS(n,d);var p=this.edgeColorBuffer.getView(f);oS(l,u,p);var m=this.lineWidthBuffer.getView(f);m[0]=s;var g=this.pointAPointBBuffer.getView(f);g[0]=h[0],g[1]=h[1],g[2]=h[2],g[3]=h[3],this.instanceCount++,this.instanceCount>=this.maxInstances&&this.endBatch()}else for(var y=0;y=this.maxInstances&&this.endBatch()}},"drawEdgeLine")},{key:"getEdgePoints",value:o(function(r){var n=r._private.rscratch,i=n.allpts;if(i.length==4)return i;var a=this.getNumSegments(r);return this.getCurveSegmentPoints(i,a)},"getEdgePoints")},{key:"getNumSegments",value:o(function(r){var n=15;return Math.min(Math.max(n,5),this.maxInstances)},"getNumSegments")},{key:"getCurveSegmentPoints",value:o(function(r,n){if(r.length==4)return r;for(var i=Array((n+1)*2),a=0;a<=n;a++)if(a==0)i[0]=r[0],i[1]=r[1];else if(a==n)i[a*2]=r[r.length-2],i[a*2+1]=r[r.length-1];else{var s=a/n;this.setCurvePoint(r,s,i,a*2)}return i},"getCurveSegmentPoints")},{key:"setCurvePoint",value:o(function(r,n,i,a){if(r.length<=2)i[a]=r[0],i[a+1]=r[1];else{for(var s=Array(r.length-2),l=0;l0},"isVisible")},{key:"getStyle",value:o(function(r,n){var i=n.pstyle("".concat(r,"-opacity")).value,a=n.pstyle("".concat(r,"-color")).value,s=n.pstyle("".concat(r,"-shape")).value;return{opacity:i,color:a,shape:s}},"getStyle")},{key:"getPadding",value:o(function(r,n){return n.pstyle("".concat(r,"-padding")).pfValue},"getPadding")},{key:"draw",value:o(function(r,n,i,a){if(this.isVisible(r,i)){var s=this.r,l=a.w,u=a.h,h=l/2,f=u/2,d=this.getStyle(r,i),p=d.shape,m=d.color,g=d.opacity;n.save(),n.fillStyle=H0e(m,g),p==="round-rectangle"||p==="roundrectangle"?s.drawRoundRectanglePath(n,h,f,l,u,"auto"):p==="ellipse"&&s.drawEllipsePath(n,h,f,l,u),n.fill(),n.restore()}},"draw")}]),t}();o(DZe,"getBGColor");Dge={};Dge.initWebgl=function(t,e){var r=this,n=r.data.contexts[r.WEBGL],i=t.cy.container();t.bgColor=DZe(i),t.webglTexSize=Math.min(t.webglTexSize,n.getParameter(n.MAX_TEXTURE_SIZE)),t.webglTexRows=Math.min(t.webglTexRows,54),t.webglBatchSize=Math.min(t.webglBatchSize,16384),t.webglTexPerBatch=Math.min(t.webglTexPerBatch,n.getParameter(n.MAX_TEXTURE_IMAGE_UNITS)),r.webglDebug=t.webglDebug,r.webglDebugShowAtlases=t.webglDebugShowAtlases,console.log("max texture units",n.getParameter(n.MAX_TEXTURE_IMAGE_UNITS)),console.log("max texture size",n.getParameter(n.MAX_TEXTURE_SIZE)),console.log("webgl options",t),r.pickingFrameBuffer=bZe(n),r.pickingFrameBuffer.needsDraw=!0;var a=o(function(f){return r.getTextAngle(f,null)},"getLabelRotation"),s=o(function(f){var d=f.pstyle("label");return d&&d.value},"isLabelVisible");r.eleDrawing=new AZe(r,n,t);var l=new _Ze(r);r.eleDrawing.addTextureRenderType("node-body",Mb({getKey:e.getStyleKey,getBoundingBox:e.getElementBox,drawElement:e.drawElement,isVisible:o(function(f){return f.visible()},"isVisible")})),r.eleDrawing.addTextureRenderType("node-label",Mb({getKey:e.getLabelKey,getBoundingBox:e.getLabelBox,drawElement:e.drawLabel,getRotation:a,getRotationPoint:e.getLabelRotationPoint,getRotationOffset:e.getLabelRotationOffset,isVisible:s})),r.eleDrawing.addTextureRenderType("node-overlay",Mb({getBoundingBox:e.getElementBox,getKey:o(function(f){return l.getStyleKey("overlay",f)},"getKey"),drawElement:o(function(f,d,p){return l.draw("overlay",f,d,p)},"drawElement"),isVisible:o(function(f){return l.isVisible("overlay",f)},"isVisible"),getPadding:o(function(f){return 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this.drawBarrelPath(e,r,n,i,a)}};zZe=Oge,Er=Oge.prototype;Er.CANVAS_LAYERS=3;Er.SELECT_BOX=0;Er.DRAG=1;Er.NODE=2;Er.WEBGL=3;Er.CANVAS_TYPES=["2d","2d","2d","webgl2"];Er.BUFFER_COUNT=3;Er.TEXTURE_BUFFER=0;Er.MOTIONBLUR_BUFFER_NODE=1;Er.MOTIONBLUR_BUFFER_DRAG=2;o(Oge,"CanvasRenderer");Er.redrawHint=function(t,e){var r=this;switch(t){case"eles":r.data.canvasNeedsRedraw[Er.NODE]=e;break;case"drag":r.data.canvasNeedsRedraw[Er.DRAG]=e;break;case"select":r.data.canvasNeedsRedraw[Er.SELECT_BOX]=e;break;case"gc":r.data.gc=!0;break}};GZe=typeof Path2D<"u";Er.path2dEnabled=function(t){if(t===void 0)return this.pathsEnabled;this.pathsEnabled=!!t};Er.usePaths=function(){return GZe&&this.pathsEnabled};Er.setImgSmoothing=function(t,e){t.imageSmoothingEnabled!=null?t.imageSmoothingEnabled=e:(t.webkitImageSmoothingEnabled=e,t.mozImageSmoothingEnabled=e,t.msImageSmoothingEnabled=e)};Er.getImgSmoothing=function(t){return 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a>s?l:1+l%4},i.getIntersection=function(a,s,l,u){if(u==null)return this.getIntersection2(a,s,l);var h=a.x,f=a.y,d=s.x,p=s.y,m=l.x,g=l.y,y=u.x,v=u.y,x=void 0,b=void 0,w=void 0,C=void 0,T=void 0,E=void 0,A=void 0,S=void 0,_=void 0;return w=p-f,T=h-d,A=d*f-h*p,C=v-g,E=m-y,S=y*g-m*v,_=w*E-C*T,_===0?null:(x=(T*S-E*A)/_,b=(C*A-w*S)/_,new n(x,b))},i.angleOfVector=function(a,s,l,u){var h=void 0;return a!==l?(h=Math.atan((u-s)/(l-a)),l0?1:i<0?-1:0},n.floor=function(i){return i<0?Math.ceil(i):Math.floor(i)},n.ceil=function(i){return i<0?Math.floor(i):Math.ceil(i)},t.exports=n},function(t,e,r){"use strict";function n(){}o(n,"Integer"),n.MAX_VALUE=2147483647,n.MIN_VALUE=-2147483648,t.exports=n},function(t,e,r){"use strict";var n=function(){function h(f,d){for(var p=0;p"u"?"undefined":n(a);return a==null||s!="object"&&s!="function"},t.exports=i},function(t,e,r){"use strict";function n(m){if(Array.isArray(m)){for(var g=0,y=Array(m.length);g0&&g;){for(w.push(T[0]);w.length>0&&g;){var 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this.ldeviceExtX},i.prototype.setDeviceExtX=function(a){this.ldeviceExtX=a},i.prototype.getDeviceExtY=function(){return this.ldeviceExtY},i.prototype.setDeviceExtY=function(a){this.ldeviceExtY=a},i.prototype.transformX=function(a){var s=0,l=this.lworldExtX;return l!=0&&(s=this.ldeviceOrgX+(a-this.lworldOrgX)*this.ldeviceExtX/l),s},i.prototype.transformY=function(a){var s=0,l=this.lworldExtY;return l!=0&&(s=this.ldeviceOrgY+(a-this.lworldOrgY)*this.ldeviceExtY/l),s},i.prototype.inverseTransformX=function(a){var s=0,l=this.ldeviceExtX;return l!=0&&(s=this.lworldOrgX+(a-this.ldeviceOrgX)*this.lworldExtX/l),s},i.prototype.inverseTransformY=function(a){var s=0,l=this.ldeviceExtY;return l!=0&&(s=this.lworldOrgY+(a-this.ldeviceOrgY)*this.lworldExtY/l),s},i.prototype.inverseTransformPoint=function(a){var s=new n(this.inverseTransformX(a.x),this.inverseTransformY(a.y));return s},t.exports=i},function(t,e,r){"use strict";function n(d){if(Array.isArray(d)){for(var p=0,m=Array(d.length);pa.ADAPTATION_LOWER_NODE_LIMIT&&(this.coolingFactor=Math.max(this.coolingFactor*a.COOLING_ADAPTATION_FACTOR,this.coolingFactor-(d-a.ADAPTATION_LOWER_NODE_LIMIT)/(a.ADAPTATION_UPPER_NODE_LIMIT-a.ADAPTATION_LOWER_NODE_LIMIT)*this.coolingFactor*(1-a.COOLING_ADAPTATION_FACTOR))),this.maxNodeDisplacement=a.MAX_NODE_DISPLACEMENT_INCREMENTAL):(d>a.ADAPTATION_LOWER_NODE_LIMIT?this.coolingFactor=Math.max(a.COOLING_ADAPTATION_FACTOR,1-(d-a.ADAPTATION_LOWER_NODE_LIMIT)/(a.ADAPTATION_UPPER_NODE_LIMIT-a.ADAPTATION_LOWER_NODE_LIMIT)*(1-a.COOLING_ADAPTATION_FACTOR)):this.coolingFactor=1,this.initialCoolingFactor=this.coolingFactor,this.maxNodeDisplacement=a.MAX_NODE_DISPLACEMENT),this.maxIterations=Math.max(this.getAllNodes().length*5,this.maxIterations),this.totalDisplacementThreshold=this.displacementThresholdPerNode*this.getAllNodes().length,this.repulsionRange=this.calcRepulsionRange()},h.prototype.calcSpringForces=function(){for(var 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u=this.graphManager.getLayout();this.displacementX=u.coolingFactor*(this.springForceX+this.repulsionForceX+this.gravitationForceX)/this.noOfChildren,this.displacementY=u.coolingFactor*(this.springForceY+this.repulsionForceY+this.gravitationForceY)/this.noOfChildren,Math.abs(this.displacementX)>u.coolingFactor*u.maxNodeDisplacement&&(this.displacementX=u.coolingFactor*u.maxNodeDisplacement*a.sign(this.displacementX)),Math.abs(this.displacementY)>u.coolingFactor*u.maxNodeDisplacement&&(this.displacementY=u.coolingFactor*u.maxNodeDisplacement*a.sign(this.displacementY)),this.child==null?this.moveBy(this.displacementX,this.displacementY):this.child.getNodes().length==0?this.moveBy(this.displacementX,this.displacementY):this.propogateDisplacementToChildren(this.displacementX,this.displacementY),u.totalDisplacement+=Math.abs(this.displacementX)+Math.abs(this.displacementY),this.springForceX=0,this.springForceY=0,this.repulsionForceX=0,this.repulsionForceY=0,this.gravitationForceX=0,this.gravitationForceY=0,this.displacementX=0,this.displacementY=0},s.prototype.propogateDisplacementToChildren=function(u,h){for(var f=this.getChild().getNodes(),d,p=0;p0)this.positionNodesRadially(T);else{this.reduceTrees(),this.graphManager.resetAllNodesToApplyGravitation();var E=new Set(this.getAllNodes()),A=this.nodesWithGravity.filter(function(S){return E.has(S)});this.graphManager.setAllNodesToApplyGravitation(A),this.positionNodesRandomly()}}return this.initSpringEmbedder(),this.runSpringEmbedder(),!0},w.prototype.tick=function(){if(this.totalIterations++,this.totalIterations===this.maxIterations&&!this.isTreeGrowing&&!this.isGrowthFinished)if(this.prunedNodesAll.length>0)this.isTreeGrowing=!0;else return!0;if(this.totalIterations%f.CONVERGENCE_CHECK_PERIOD==0&&!this.isTreeGrowing&&!this.isGrowthFinished){if(this.isConverged())if(this.prunedNodesAll.length>0)this.isTreeGrowing=!0;else 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O=E[L][0].getParent(),M=new l(T.graphManager);M.id=R,M.paddingLeft=O.paddingLeft||0,M.paddingRight=O.paddingRight||0,M.paddingBottom=O.paddingBottom||0,M.paddingTop=O.paddingTop||0,T.idToDummyNode[R]=M;var B=T.getGraphManager().add(T.newGraph(),M),F=O.getChild();F.add(M);for(var P=0;P=0;T--){var E=this.compoundOrder[T],A=E.id,S=E.paddingLeft,_=E.paddingTop;this.adjustLocations(this.tiledMemberPack[A],E.rect.x,E.rect.y,S,_)}},w.prototype.repopulateZeroDegreeMembers=function(){var T=this,E=this.tiledZeroDegreePack;Object.keys(E).forEach(function(A){var S=T.idToDummyNode[A],_=S.paddingLeft,I=S.paddingTop;T.adjustLocations(E[A],S.rect.x,S.rect.y,_,I)})},w.prototype.getToBeTiled=function(T){var E=T.id;if(this.toBeTiled[E]!=null)return this.toBeTiled[E];var A=T.getChild();if(A==null)return this.toBeTiled[E]=!1,!1;for(var S=A.getNodes(),_=0;_0)return this.toBeTiled[E]=!1,!1;if(I.getChild()==null){this.toBeTiled[I.id]=!1;continue}if(!this.getToBeTiled(I))return this.toBeTiled[E]=!1,!1}return this.toBeTiled[E]=!0,!0},w.prototype.getNodeDegree=function(T){for(var E=T.id,A=T.getEdges(),S=0,_=0;_L&&(L=O.rect.height)}A+=L+T.verticalPadding}},w.prototype.tileCompoundMembers=function(T,E){var A=this;this.tiledMemberPack=[],Object.keys(T).forEach(function(S){var _=E[S];A.tiledMemberPack[S]=A.tileNodes(T[S],_.paddingLeft+_.paddingRight),_.rect.width=A.tiledMemberPack[S].width,_.rect.height=A.tiledMemberPack[S].height})},w.prototype.tileNodes=function(T,E){var A=h.TILING_PADDING_VERTICAL,S=h.TILING_PADDING_HORIZONTAL,_={rows:[],rowWidth:[],rowHeight:[],width:0,height:E,verticalPadding:A,horizontalPadding:S};T.sort(function(k,L){return k.rect.width*k.rect.height>L.rect.width*L.rect.height?-1:k.rect.width*k.rect.height0&&(D+=T.horizontalPadding),T.rowWidth[A]=D,T.width0&&(k+=T.verticalPadding);var L=0;k>T.rowHeight[A]&&(L=T.rowHeight[A],T.rowHeight[A]=k,L=T.rowHeight[A]-L),T.height+=L,T.rows[A].push(E)},w.prototype.getShortestRowIndex=function(T){for(var E=-1,A=Number.MAX_VALUE,S=0;SA&&(E=S,A=T.rowWidth[S]);return E},w.prototype.canAddHorizontal=function(T,E,A){var S=this.getShortestRowIndex(T);if(S<0)return!0;var _=T.rowWidth[S];if(_+T.horizontalPadding+E<=T.width)return!0;var I=0;T.rowHeight[S]0&&(I=A+T.verticalPadding-T.rowHeight[S]);var D;T.width-_>=E+T.horizontalPadding?D=(T.height+I)/(_+E+T.horizontalPadding):D=(T.height+I)/T.width,I=A+T.verticalPadding;var k;return T.widthI&&E!=A){S.splice(-1,1),T.rows[A].push(_),T.rowWidth[E]=T.rowWidth[E]-I,T.rowWidth[A]=T.rowWidth[A]+I,T.width=T.rowWidth[instance.getLongestRowIndex(T)];for(var D=Number.MIN_VALUE,k=0;kD&&(D=S[k].height);E>0&&(D+=T.verticalPadding);var L=T.rowHeight[E]+T.rowHeight[A];T.rowHeight[E]=D,T.rowHeight[A]<_.height+T.verticalPadding&&(T.rowHeight[A]=_.height+T.verticalPadding);var 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p=[],m,g=this;return g.edges.forEach(function(y){if(y.target==d){if(y.source!=g)throw"Incorrect edge source!";p.push(y)}}),p},h.prototype.getEdgesBetween=function(d){var p=[],m,g=this;return g.edges.forEach(function(y){if(!(y.source==g||y.target==g))throw"Incorrect edge source and/or target";(y.target==d||y.source==d)&&p.push(y)}),p},h.prototype.getNeighborsList=function(){var d=new Set,p=this;return p.edges.forEach(function(m){if(m.source==p)d.add(m.target);else{if(m.target!=p)throw"Incorrect incidency!";d.add(m.source)}}),d},h.prototype.withChildren=function(){var d=new Set,p,m;if(d.add(this),this.child!=null)for(var g=this.child.getNodes(),y=0;yp&&(this.rect.x-=(this.labelWidth-p)/2,this.setWidth(this.labelWidth)),this.labelHeight>m&&(this.labelPos=="center"?this.rect.y-=(this.labelHeight-m)/2:this.labelPos=="top"&&(this.rect.y-=this.labelHeight-m),this.setHeight(this.labelHeight))}}},h.prototype.getInclusionTreeDepth=function(){if(this.inclusionTreeDepth==i.MAX_VALUE)throw"assert failed";return this.inclusionTreeDepth},h.prototype.transform=function(d){var p=this.rect.x;p>s.WORLD_BOUNDARY?p=s.WORLD_BOUNDARY:p<-s.WORLD_BOUNDARY&&(p=-s.WORLD_BOUNDARY);var m=this.rect.y;m>s.WORLD_BOUNDARY?m=s.WORLD_BOUNDARY:m<-s.WORLD_BOUNDARY&&(m=-s.WORLD_BOUNDARY);var g=new u(p,m),y=d.inverseTransformPoint(g);this.setLocation(y.x,y.y)},h.prototype.getLeft=function(){return this.rect.x},h.prototype.getRight=function(){return this.rect.x+this.rect.width},h.prototype.getTop=function(){return this.rect.y},h.prototype.getBottom=function(){return this.rect.y+this.rect.height},h.prototype.getParent=function(){return this.owner==null?null:this.owner.getParent()},t.exports=h},function(t,e,r){"use strict";function n(i,a){i==null&&a==null?(this.x=0,this.y=0):(this.x=i,this.y=a)}o(n,"PointD"),n.prototype.getX=function(){return this.x},n.prototype.getY=function(){return this.y},n.prototype.setX=function(i){this.x=i},n.prototype.setY=function(i){this.y=i},n.prototype.getDifference=function(i){return new DimensionD(this.x-i.x,this.y-i.y)},n.prototype.getCopy=function(){return new n(this.x,this.y)},n.prototype.translate=function(i){return this.x+=i.width,this.y+=i.height,this},t.exports=n},function(t,e,r){"use strict";var n=r(2),i=r(10),a=r(0),s=r(6),l=r(3),u=r(1),h=r(13),f=r(12),d=r(11);function p(g,y,v){n.call(this,v),this.estimatedSize=i.MIN_VALUE,this.margin=a.DEFAULT_GRAPH_MARGIN,this.edges=[],this.nodes=[],this.isConnected=!1,this.parent=g,y!=null&&y instanceof s?this.graphManager=y:y!=null&&y instanceof Layout&&(this.graphManager=y.graphManager)}o(p,"LGraph"),p.prototype=Object.create(n.prototype);for(var m in n)p[m]=n[m];p.prototype.getNodes=function(){return this.nodes},p.prototype.getEdges=function(){return this.edges},p.prototype.getGraphManager=function(){return this.graphManager},p.prototype.getParent=function(){return this.parent},p.prototype.getLeft=function(){return this.left},p.prototype.getRight=function(){return this.right},p.prototype.getTop=function(){return this.top},p.prototype.getBottom=function(){return this.bottom},p.prototype.isConnected=function(){return this.isConnected},p.prototype.add=function(g,y,v){if(y==null&&v==null){var x=g;if(this.graphManager==null)throw"Graph has no graph mgr!";if(this.getNodes().indexOf(x)>-1)throw"Node already in graph!";return x.owner=this,this.getNodes().push(x),x}else{var b=g;if(!(this.getNodes().indexOf(y)>-1&&this.getNodes().indexOf(v)>-1))throw"Source or target not in graph!";if(!(y.owner==v.owner&&y.owner==this))throw"Both owners must be this graph!";return y.owner!=v.owner?null:(b.source=y,b.target=v,b.isInterGraph=!1,this.getEdges().push(b),y.edges.push(b),v!=y&&v.edges.push(b),b)}},p.prototype.remove=function(g){var y=g;if(g instanceof l){if(y==null)throw"Node is null!";if(!(y.owner!=null&&y.owner==this))throw"Owner graph is invalid!";if(this.graphManager==null)throw"Owner graph manager is invalid!";for(var v=y.edges.slice(),x,b=v.length,w=0;w-1&&E>-1))throw"Source and/or target doesn't know this edge!";x.source.edges.splice(T,1),x.target!=x.source&&x.target.edges.splice(E,1);var C=x.source.owner.getEdges().indexOf(x);if(C==-1)throw"Not in owner's edge list!";x.source.owner.getEdges().splice(C,1)}},p.prototype.updateLeftTop=function(){for(var g=i.MAX_VALUE,y=i.MAX_VALUE,v,x,b,w=this.getNodes(),C=w.length,T=0;Tv&&(g=v),y>x&&(y=x)}return g==i.MAX_VALUE?null:(w[0].getParent().paddingLeft!=null?b=w[0].getParent().paddingLeft:b=this.margin,this.left=y-b,this.top=g-b,new f(this.left,this.top))},p.prototype.updateBounds=function(g){for(var y=i.MAX_VALUE,v=-i.MAX_VALUE,x=i.MAX_VALUE,b=-i.MAX_VALUE,w,C,T,E,A,S=this.nodes,_=S.length,I=0;I<_;I++){var L=S[I];g&&L.child!=null&&L.updateBounds(),w=L.getLeft(),C=L.getRight(),T=L.getTop(),E=L.getBottom(),y>w&&(y=w),vT&&(x=T),bw&&(y=w),vT&&(x=T),b=this.nodes.length){var _=0;v.forEach(function(I){I.owner==g&&_++}),_==this.nodes.length&&(this.isConnected=!0)}},t.exports=p},function(t,e,r){"use strict";var n,i=r(1);function a(s){n=r(5),this.layout=s,this.graphs=[],this.edges=[]}o(a,"LGraphManager"),a.prototype.addRoot=function(){var s=this.layout.newGraph(),l=this.layout.newNode(null),u=this.add(s,l);return this.setRootGraph(u),this.rootGraph},a.prototype.add=function(s,l,u,h,f){if(u==null&&h==null&&f==null){if(s==null)throw"Graph is null!";if(l==null)throw"Parent node is null!";if(this.graphs.indexOf(s)>-1)throw"Graph already in this graph mgr!";if(this.graphs.push(s),s.parent!=null)throw"Already has a parent!";if(l.child!=null)throw"Already has a child!";return s.parent=l,l.child=s,s}else{f=u,h=l,u=s;var d=h.getOwner(),p=f.getOwner();if(!(d!=null&&d.getGraphManager()==this))throw"Source not in this graph mgr!";if(!(p!=null&&p.getGraphManager()==this))throw"Target not in this graph mgr!";if(d==p)return u.isInterGraph=!1,d.add(u,h,f);if(u.isInterGraph=!0,u.source=h,u.target=f,this.edges.indexOf(u)>-1)throw"Edge already in inter-graph edge list!";if(this.edges.push(u),!(u.source!=null&&u.target!=null))throw"Edge source and/or target is null!";if(!(u.source.edges.indexOf(u)==-1&&u.target.edges.indexOf(u)==-1))throw"Edge already in source and/or target incidency list!";return u.source.edges.push(u),u.target.edges.push(u),u}},a.prototype.remove=function(s){if(s instanceof n){var l=s;if(l.getGraphManager()!=this)throw"Graph not in this graph mgr";if(!(l==this.rootGraph||l.parent!=null&&l.parent.graphManager==this))throw"Invalid parent node!";var u=[];u=u.concat(l.getEdges());for(var h,f=u.length,d=0;d=s.getRight()?l[0]+=Math.min(s.getX()-a.getX(),a.getRight()-s.getRight()):s.getX()<=a.getX()&&s.getRight()>=a.getRight()&&(l[0]+=Math.min(a.getX()-s.getX(),s.getRight()-a.getRight())),a.getY()<=s.getY()&&a.getBottom()>=s.getBottom()?l[1]+=Math.min(s.getY()-a.getY(),a.getBottom()-s.getBottom()):s.getY()<=a.getY()&&s.getBottom()>=a.getBottom()&&(l[1]+=Math.min(a.getY()-s.getY(),s.getBottom()-a.getBottom()));var f=Math.abs((s.getCenterY()-a.getCenterY())/(s.getCenterX()-a.getCenterX()));s.getCenterY()===a.getCenterY()&&s.getCenterX()===a.getCenterX()&&(f=1);var d=f*l[0],p=l[1]/f;l[0]d)return l[0]=u,l[1]=m,l[2]=f,l[3]=S,!1;if(hf)return l[0]=p,l[1]=h,l[2]=E,l[3]=d,!1;if(uf?(l[0]=y,l[1]=v,k=!0):(l[0]=g,l[1]=m,k=!0):R===M&&(u>f?(l[0]=p,l[1]=m,k=!0):(l[0]=x,l[1]=v,k=!0)),-O===M?f>u?(l[2]=A,l[3]=S,D=!0):(l[2]=E,l[3]=T,D=!0):O===M&&(f>u?(l[2]=C,l[3]=T,D=!0):(l[2]=_,l[3]=S,D=!0)),k&&D)return!1;if(u>f?h>d?(P=this.getCardinalDirection(R,M,4),B=this.getCardinalDirection(O,M,2)):(P=this.getCardinalDirection(-R,M,3),B=this.getCardinalDirection(-O,M,1)):h>d?(P=this.getCardinalDirection(-R,M,1),B=this.getCardinalDirection(-O,M,3)):(P=this.getCardinalDirection(R,M,2),B=this.getCardinalDirection(O,M,4)),!k)switch(P){case 1:z=m,F=u+-w/M,l[0]=F,l[1]=z;break;case 2:F=x,z=h+b*M,l[0]=F,l[1]=z;break;case 3:z=v,F=u+w/M,l[0]=F,l[1]=z;break;case 4:F=y,z=h+-b*M,l[0]=F,l[1]=z;break}if(!D)switch(B){case 1:U=T,$=f+-L/M,l[2]=$,l[3]=U;break;case 2:$=_,U=d+I*M,l[2]=$,l[3]=U;break;case 3:U=S,$=f+L/M,l[2]=$,l[3]=U;break;case 4:$=A,U=d+-I*M,l[2]=$,l[3]=U;break}}return!1},i.getCardinalDirection=function(a,s,l){return a>s?l:1+l%4},i.getIntersection=function(a,s,l,u){if(u==null)return this.getIntersection2(a,s,l);var h=a.x,f=a.y,d=s.x,p=s.y,m=l.x,g=l.y,y=u.x,v=u.y,x=void 0,b=void 0,w=void 0,C=void 0,T=void 0,E=void 0,A=void 0,S=void 0,_=void 0;return w=p-f,T=h-d,A=d*f-h*p,C=v-g,E=m-y,S=y*g-m*v,_=w*E-C*T,_===0?null:(x=(T*S-E*A)/_,b=(C*A-w*S)/_,new n(x,b))},i.angleOfVector=function(a,s,l,u){var h=void 0;return a!==l?(h=Math.atan((u-s)/(l-a)),l0?1:i<0?-1:0},n.floor=function(i){return i<0?Math.ceil(i):Math.floor(i)},n.ceil=function(i){return i<0?Math.floor(i):Math.ceil(i)},t.exports=n},function(t,e,r){"use strict";function n(){}o(n,"Integer"),n.MAX_VALUE=2147483647,n.MIN_VALUE=-2147483648,t.exports=n},function(t,e,r){"use strict";var n=function(){function h(f,d){for(var p=0;p"u"?"undefined":n(a);return a==null||s!="object"&&s!="function"},t.exports=i},function(t,e,r){"use strict";function n(m){if(Array.isArray(m)){for(var g=0,y=Array(m.length);g0&&g;){for(w.push(T[0]);w.length>0&&g;){var E=w[0];w.splice(0,1),b.add(E);for(var A=E.getEdges(),x=0;x-1&&T.splice(L,1)}b=new Set,C=new Map}}return m},p.prototype.createDummyNodesForBendpoints=function(m){for(var g=[],y=m.source,v=this.graphManager.calcLowestCommonAncestor(m.source,m.target),x=0;x0){for(var v=this.edgeToDummyNodes.get(y),x=0;x=0&&g.splice(S,1);var _=C.getNeighborsList();_.forEach(function(k){if(y.indexOf(k)<0){var D=v.get(k),R=D-1;R==1&&E.push(k),v.set(k,R)}})}y=y.concat(E),(g.length==1||g.length==2)&&(x=!0,b=g[0])}return b},p.prototype.setGraphManager=function(m){this.graphManager=m},t.exports=p},function(t,e,r){"use strict";function n(){}o(n,"RandomSeed"),n.seed=1,n.x=0,n.nextDouble=function(){return n.x=Math.sin(n.seed++)*1e4,n.x-Math.floor(n.x)},t.exports=n},function(t,e,r){"use strict";var n=r(4);function i(a,s){this.lworldOrgX=0,this.lworldOrgY=0,this.ldeviceOrgX=0,this.ldeviceOrgY=0,this.lworldExtX=1,this.lworldExtY=1,this.ldeviceExtX=1,this.ldeviceExtY=1}o(i,"Transform"),i.prototype.getWorldOrgX=function(){return this.lworldOrgX},i.prototype.setWorldOrgX=function(a){this.lworldOrgX=a},i.prototype.getWorldOrgY=function(){return this.lworldOrgY},i.prototype.setWorldOrgY=function(a){this.lworldOrgY=a},i.prototype.getWorldExtX=function(){return this.lworldExtX},i.prototype.setWorldExtX=function(a){this.lworldExtX=a},i.prototype.getWorldExtY=function(){return this.lworldExtY},i.prototype.setWorldExtY=function(a){this.lworldExtY=a},i.prototype.getDeviceOrgX=function(){return this.ldeviceOrgX},i.prototype.setDeviceOrgX=function(a){this.ldeviceOrgX=a},i.prototype.getDeviceOrgY=function(){return this.ldeviceOrgY},i.prototype.setDeviceOrgY=function(a){this.ldeviceOrgY=a},i.prototype.getDeviceExtX=function(){return this.ldeviceExtX},i.prototype.setDeviceExtX=function(a){this.ldeviceExtX=a},i.prototype.getDeviceExtY=function(){return this.ldeviceExtY},i.prototype.setDeviceExtY=function(a){this.ldeviceExtY=a},i.prototype.transformX=function(a){var s=0,l=this.lworldExtX;return l!=0&&(s=this.ldeviceOrgX+(a-this.lworldOrgX)*this.ldeviceExtX/l),s},i.prototype.transformY=function(a){var s=0,l=this.lworldExtY;return l!=0&&(s=this.ldeviceOrgY+(a-this.lworldOrgY)*this.ldeviceExtY/l),s},i.prototype.inverseTransformX=function(a){var s=0,l=this.ldeviceExtX;return l!=0&&(s=this.lworldOrgX+(a-this.ldeviceOrgX)*this.lworldExtX/l),s},i.prototype.inverseTransformY=function(a){var s=0,l=this.ldeviceExtY;return l!=0&&(s=this.lworldOrgY+(a-this.ldeviceOrgY)*this.lworldExtY/l),s},i.prototype.inverseTransformPoint=function(a){var s=new n(this.inverseTransformX(a.x),this.inverseTransformY(a.y));return s},t.exports=i},function(t,e,r){"use strict";function n(d){if(Array.isArray(d)){for(var p=0,m=Array(d.length);pa.ADAPTATION_LOWER_NODE_LIMIT&&(this.coolingFactor=Math.max(this.coolingFactor*a.COOLING_ADAPTATION_FACTOR,this.coolingFactor-(d-a.ADAPTATION_LOWER_NODE_LIMIT)/(a.ADAPTATION_UPPER_NODE_LIMIT-a.ADAPTATION_LOWER_NODE_LIMIT)*this.coolingFactor*(1-a.COOLING_ADAPTATION_FACTOR))),this.maxNodeDisplacement=a.MAX_NODE_DISPLACEMENT_INCREMENTAL):(d>a.ADAPTATION_LOWER_NODE_LIMIT?this.coolingFactor=Math.max(a.COOLING_ADAPTATION_FACTOR,1-(d-a.ADAPTATION_LOWER_NODE_LIMIT)/(a.ADAPTATION_UPPER_NODE_LIMIT-a.ADAPTATION_LOWER_NODE_LIMIT)*(1-a.COOLING_ADAPTATION_FACTOR)):this.coolingFactor=1,this.initialCoolingFactor=this.coolingFactor,this.maxNodeDisplacement=a.MAX_NODE_DISPLACEMENT),this.maxIterations=Math.max(this.getAllNodes().length*5,this.maxIterations),this.totalDisplacementThreshold=this.displacementThresholdPerNode*this.getAllNodes().length,this.repulsionRange=this.calcRepulsionRange()},h.prototype.calcSpringForces=function(){for(var d=this.getAllEdges(),p,m=0;m0&&arguments[0]!==void 0?arguments[0]:!0,p=arguments.length>1&&arguments[1]!==void 0?arguments[1]:!1,m,g,y,v,x=this.getAllNodes(),b;if(this.useFRGridVariant)for(this.totalIterations%a.GRID_CALCULATION_CHECK_PERIOD==1&&d&&this.updateGrid(),b=new Set,m=0;mw||b>w)&&(d.gravitationForceX=-this.gravityConstant*y,d.gravitationForceY=-this.gravityConstant*v)):(w=p.getEstimatedSize()*this.compoundGravityRangeFactor,(x>w||b>w)&&(d.gravitationForceX=-this.gravityConstant*y*this.compoundGravityConstant,d.gravitationForceY=-this.gravityConstant*v*this.compoundGravityConstant))},h.prototype.isConverged=function(){var d,p=!1;return this.totalIterations>this.maxIterations/3&&(p=Math.abs(this.totalDisplacement-this.oldTotalDisplacement)<2),d=this.totalDisplacement=x.length||w>=x[0].length)){for(var C=0;Ch},"_defaultCompareFunction")}]),l}();t.exports=s},function(t,e,r){"use strict";var n=function(){function s(l,u){for(var h=0;h2&&arguments[2]!==void 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i},n.d=function(i,a,s){n.o(i,a)||Object.defineProperty(i,a,{configurable:!1,enumerable:!0,get:s})},n.n=function(i){var a=i&&i.__esModule?o(function(){return i.default},"getDefault"):o(function(){return i},"getModuleExports");return n.d(a,"a",a),a},n.o=function(i,a){return Object.prototype.hasOwnProperty.call(i,a)},n.p="",n(n.s=7)}([function(e,r){e.exports=t},function(e,r,n){"use strict";var i=n(0).FDLayoutConstants;function a(){}o(a,"CoSEConstants");for(var s in i)a[s]=i[s];a.DEFAULT_USE_MULTI_LEVEL_SCALING=!1,a.DEFAULT_RADIAL_SEPARATION=i.DEFAULT_EDGE_LENGTH,a.DEFAULT_COMPONENT_SEPERATION=60,a.TILE=!0,a.TILING_PADDING_VERTICAL=10,a.TILING_PADDING_HORIZONTAL=10,a.TREE_REDUCTION_ON_INCREMENTAL=!1,e.exports=a},function(e,r,n){"use strict";var i=n(0).FDLayoutEdge;function a(l,u,h){i.call(this,l,u,h)}o(a,"CoSEEdge"),a.prototype=Object.create(i.prototype);for(var s in i)a[s]=i[s];e.exports=a},function(e,r,n){"use strict";var i=n(0).LGraph;function a(l,u,h){i.call(this,l,u,h)}o(a,"CoSEGraph"),a.prototype=Object.create(i.prototype);for(var s in i)a[s]=i[s];e.exports=a},function(e,r,n){"use strict";var i=n(0).LGraphManager;function a(l){i.call(this,l)}o(a,"CoSEGraphManager"),a.prototype=Object.create(i.prototype);for(var s in i)a[s]=i[s];e.exports=a},function(e,r,n){"use strict";var i=n(0).FDLayoutNode,a=n(0).IMath;function s(u,h,f,d){i.call(this,u,h,f,d)}o(s,"CoSENode"),s.prototype=Object.create(i.prototype);for(var l in i)s[l]=i[l];s.prototype.move=function(){var u=this.graphManager.getLayout();this.displacementX=u.coolingFactor*(this.springForceX+this.repulsionForceX+this.gravitationForceX)/this.noOfChildren,this.displacementY=u.coolingFactor*(this.springForceY+this.repulsionForceY+this.gravitationForceY)/this.noOfChildren,Math.abs(this.displacementX)>u.coolingFactor*u.maxNodeDisplacement&&(this.displacementX=u.coolingFactor*u.maxNodeDisplacement*a.sign(this.displacementX)),Math.abs(this.displacementY)>u.coolingFactor*u.maxNodeDisplacement&&(this.displacementY=u.coolingFactor*u.maxNodeDisplacement*a.sign(this.displacementY)),this.child==null?this.moveBy(this.displacementX,this.displacementY):this.child.getNodes().length==0?this.moveBy(this.displacementX,this.displacementY):this.propogateDisplacementToChildren(this.displacementX,this.displacementY),u.totalDisplacement+=Math.abs(this.displacementX)+Math.abs(this.displacementY),this.springForceX=0,this.springForceY=0,this.repulsionForceX=0,this.repulsionForceY=0,this.gravitationForceX=0,this.gravitationForceY=0,this.displacementX=0,this.displacementY=0},s.prototype.propogateDisplacementToChildren=function(u,h){for(var f=this.getChild().getNodes(),d,p=0;p0)this.positionNodesRadially(T);else{this.reduceTrees(),this.graphManager.resetAllNodesToApplyGravitation();var E=new Set(this.getAllNodes()),A=this.nodesWithGravity.filter(function(S){return E.has(S)});this.graphManager.setAllNodesToApplyGravitation(A),this.positionNodesRandomly()}}return this.initSpringEmbedder(),this.runSpringEmbedder(),!0},w.prototype.tick=function(){if(this.totalIterations++,this.totalIterations===this.maxIterations&&!this.isTreeGrowing&&!this.isGrowthFinished)if(this.prunedNodesAll.length>0)this.isTreeGrowing=!0;else return!0;if(this.totalIterations%f.CONVERGENCE_CHECK_PERIOD==0&&!this.isTreeGrowing&&!this.isGrowthFinished){if(this.isConverged())if(this.prunedNodesAll.length>0)this.isTreeGrowing=!0;else 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E=-1,A=Number.MAX_VALUE,S=0;SA&&(E=S,A=T.rowWidth[S]);return E},w.prototype.canAddHorizontal=function(T,E,A){var S=this.getShortestRowIndex(T);if(S<0)return!0;var _=T.rowWidth[S];if(_+T.horizontalPadding+E<=T.width)return!0;var I=0;T.rowHeight[S]0&&(I=A+T.verticalPadding-T.rowHeight[S]);var L;T.width-_>=E+T.horizontalPadding?L=(T.height+I)/(_+E+T.horizontalPadding):L=(T.height+I)/T.width,I=A+T.verticalPadding;var k;return T.widthI&&E!=A){S.splice(-1,1),T.rows[A].push(_),T.rowWidth[E]=T.rowWidth[E]-I,T.rowWidth[A]=T.rowWidth[A]+I,T.width=T.rowWidth[instance.getLongestRowIndex(T)];for(var L=Number.MIN_VALUE,k=0;kL&&(L=S[k].height);E>0&&(L+=T.verticalPadding);var D=T.rowHeight[E]+T.rowHeight[A];T.rowHeight[E]=L,T.rowHeight[A]<_.height+T.verticalPadding&&(T.rowHeight[A]=_.height+T.verticalPadding);var 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k=this.yylloc.range;return this.yylloc={first_line:this.yylloc.first_line,last_line:this.yylineno+1,first_column:this.yylloc.first_column,last_column:I?(I.length===L.length?this.yylloc.first_column:0)+L[L.length-I.length].length-I[0].length:this.yylloc.first_column-_},this.options.ranges&&(this.yylloc.range=[k[0],k[0]+this.yyleng-_]),this.yyleng=this.yytext.length,this},"unput"),more:o(function(){return this._more=!0,this},"more"),reject:o(function(){if(this.options.backtrack_lexer)this._backtrack=!0;else return this.parseError("Lexical error on line "+(this.yylineno+1)+`. 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A}();C.lexer=T;function E(){this.yy={}}return o(E,"Parser"),E.prototype=C,C.Parser=E,new E}();DB.parser=DB;r1e=DB});var nl,RB,LB,NB,fJe,dJe,i1e,pJe,mJe,Yi,gJe,yJe,vJe,xJe,bJe,wJe,TJe,a1e,s1e=N(()=>{"use strict";zt();gr();vt();Ya();Ew();nl=[],RB=[],LB=0,NB={},fJe=o(()=>{nl=[],RB=[],LB=0,NB={}},"clear"),dJe=o(t=>{if(nl.length===0)return null;let e=nl[0].level,r=null;for(let n=nl.length-1;n>=0;n--)if(nl[n].level===e&&!r&&(r=nl[n]),nl[n].levell.parentId===i.id);for(let l of s){let u={id:l.id,parentId:i.id,label:Tr(l.label??"",n),isGroup:!1,ticket:l?.ticket,priority:l?.priority,assigned:l?.assigned,icon:l?.icon,shape:"kanbanItem",level:l.level,rx:5,ry:5,cssStyles:["text-align: left"]};e.push(u)}}return{nodes:e,edges:t,other:{},config:me()}},"getData"),mJe=o((t,e,r,n,i)=>{let a=me(),s=a.mindmap?.padding??or.mindmap.padding;switch(n){case Yi.ROUNDED_RECT:case Yi.RECT:case Yi.HEXAGON:s*=2}let 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T.getLogger().debug("Found nl-block"),31;break;case 3:return T.getLogger().debug("Found space-block"),29;break;case 4:T.getLogger().debug(".",E.yytext);break;case 5:T.getLogger().debug("_",E.yytext);break;case 6:return 5;case 7:return E.yytext=-1,28;break;case 8:return E.yytext=E.yytext.replace(/columns\s+/,""),T.getLogger().debug("COLUMNS (LEX)",E.yytext),28;break;case 9:this.pushState("md_string");break;case 10:return"MD_STR";case 11:this.popState();break;case 12:this.pushState("string");break;case 13:T.getLogger().debug("LEX: POPPING STR:",E.yytext),this.popState();break;case 14:return T.getLogger().debug("LEX: STR end:",E.yytext),"STR";break;case 15:return E.yytext=E.yytext.replace(/space\:/,""),T.getLogger().debug("SPACE NUM (LEX)",E.yytext),21;break;case 16:return E.yytext="1",T.getLogger().debug("COLUMNS (LEX)",E.yytext),21;break;case 17:return 43;case 18:return"LINKSTYLE";case 19:return"INTERPOLATE";case 20:return this.pushState("CLASSDEF"),40;break;case 21:return this.popState(),this.pushState("CLASSDEFID"),"DEFAULT_CLASSDEF_ID";break;case 22:return this.popState(),this.pushState("CLASSDEFID"),41;break;case 23:return this.popState(),42;break;case 24:return this.pushState("CLASS"),44;break;case 25:return this.popState(),this.pushState("CLASS_STYLE"),45;break;case 26:return this.popState(),46;break;case 27:return this.pushState("STYLE_STMNT"),47;break;case 28:return this.popState(),this.pushState("STYLE_DEFINITION"),48;break;case 29:return this.popState(),49;break;case 30:return this.pushState("acc_title"),"acc_title";break;case 31:return this.popState(),"acc_title_value";break;case 32:return this.pushState("acc_descr"),"acc_descr";break;case 33:return this.popState(),"acc_descr_value";break;case 34:this.pushState("acc_descr_multiline");break;case 35:this.popState();break;case 36:return"acc_descr_multiline_value";case 37:return 30;case 38:return this.popState(),T.getLogger().debug("Lex: (("),"NODE_DEND";break;case 39:return 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T.getLogger().debug("Lexa: (["),this.pushState("NODE"),36;break;case 65:return T.getLogger().debug("Lexa: )"),this.pushState("NODE"),36;break;case 66:return this.pushState("NODE"),36;break;case 67:return this.pushState("NODE"),36;break;case 68:return this.pushState("NODE"),36;break;case 69:return this.pushState("NODE"),36;break;case 70:return this.pushState("NODE"),36;break;case 71:return this.pushState("NODE"),36;break;case 72:return this.pushState("NODE"),36;break;case 73:return T.getLogger().debug("Lexa: ["),this.pushState("NODE"),36;break;case 74:return this.pushState("BLOCK_ARROW"),T.getLogger().debug("LEX ARR START"),38;break;case 75:return T.getLogger().debug("Lex: NODE_ID",E.yytext),32;break;case 76:return T.getLogger().debug("Lex: EOF",E.yytext),8;break;case 77:this.pushState("md_string");break;case 78:this.pushState("md_string");break;case 79:return"NODE_DESCR";case 80:this.popState();break;case 81:T.getLogger().debug("Lex: Starting string"),this.pushState("string");break;case 82:T.getLogger().debug("LEX ARR: Starting string"),this.pushState("string");break;case 83:return T.getLogger().debug("LEX: NODE_DESCR:",E.yytext),"NODE_DESCR";break;case 84:T.getLogger().debug("LEX POPPING"),this.popState();break;case 85:T.getLogger().debug("Lex: =>BAE"),this.pushState("ARROW_DIR");break;case 86:return E.yytext=E.yytext.replace(/^,\s*/,""),T.getLogger().debug("Lex (right): dir:",E.yytext),"DIR";break;case 87:return E.yytext=E.yytext.replace(/^,\s*/,""),T.getLogger().debug("Lex (left):",E.yytext),"DIR";break;case 88:return E.yytext=E.yytext.replace(/^,\s*/,""),T.getLogger().debug("Lex (x):",E.yytext),"DIR";break;case 89:return E.yytext=E.yytext.replace(/^,\s*/,""),T.getLogger().debug("Lex (y):",E.yytext),"DIR";break;case 90:return E.yytext=E.yytext.replace(/^,\s*/,""),T.getLogger().debug("Lex (up):",E.yytext),"DIR";break;case 91:return E.yytext=E.yytext.replace(/^,\s*/,""),T.getLogger().debug("Lex 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this.popState(),T.getLogger().debug("Lex: LINK",E.yytext),15;break;case 104:return this.popState(),T.getLogger().debug("Lex: LINK",E.yytext),15;break;case 105:return T.getLogger().debug("Lex: 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w}();v.lexer=x;function b(){this.yy={}}return o(b,"Parser"),b.prototype=v,v.Parser=b,new b}();KB.parser=KB;bye=KB});function Yet(t){switch(Y.debug("typeStr2Type",t),t){case"[]":return"square";case"()":return Y.debug("we have a round"),"round";case"(())":return"circle";case">]":return"rect_left_inv_arrow";case"{}":return"diamond";case"{{}}":return"hexagon";case"([])":return"stadium";case"[[]]":return"subroutine";case"[()]":return"cylinder";case"((()))":return"doublecircle";case"[//]":return"lean_right";case"[\\\\]":return"lean_left";case"[/\\]":return"trapezoid";case"[\\/]":return"inv_trapezoid";case"<[]>":return"block_arrow";default:return"na"}}function Xet(t){switch(Y.debug("typeStr2Type",t),t){case"==":return"thick";default:return"normal"}}function jet(t){switch(t.trim()){case"--x":return"arrow_cross";case"--o":return"arrow_circle";default:return"arrow_point"}}var 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qa(n,i,a,e)},"fade"),ott=o(t=>`.label { +`+this.showPosition(),{text:"",token:null,line:this.yylineno})},"next"),lex:o(function(){var T=this.next();return T||this.lex()},"lex"),begin:o(function(T){this.conditionStack.push(T)},"begin"),popState:o(function(){var T=this.conditionStack.length-1;return T>0?this.conditionStack.pop():this.conditionStack[0]},"popState"),_currentRules:o(function(){return this.conditionStack.length&&this.conditionStack[this.conditionStack.length-1]?this.conditions[this.conditionStack[this.conditionStack.length-1]].rules:this.conditions.INITIAL.rules},"_currentRules"),topState:o(function(T){return T=this.conditionStack.length-1-Math.abs(T||0),T>=0?this.conditionStack[T]:"INITIAL"},"topState"),pushState:o(function(T){this.begin(T)},"pushState"),stateStackSize:o(function(){return this.conditionStack.length},"stateStackSize"),options:{},performAction:o(function(T,E,A,S){var _=S;switch(A){case 0:return 10;case 1:return T.getLogger().debug("Found 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this.pushState("CLASSDEF"),40;break;case 21:return this.popState(),this.pushState("CLASSDEFID"),"DEFAULT_CLASSDEF_ID";break;case 22:return this.popState(),this.pushState("CLASSDEFID"),41;break;case 23:return this.popState(),42;break;case 24:return this.pushState("CLASS"),44;break;case 25:return this.popState(),this.pushState("CLASS_STYLE"),45;break;case 26:return this.popState(),46;break;case 27:return this.pushState("STYLE_STMNT"),47;break;case 28:return this.popState(),this.pushState("STYLE_DEFINITION"),48;break;case 29:return this.popState(),49;break;case 30:return this.pushState("acc_title"),"acc_title";break;case 31:return this.popState(),"acc_title_value";break;case 32:return this.pushState("acc_descr"),"acc_descr";break;case 33:return this.popState(),"acc_descr_value";break;case 34:this.pushState("acc_descr_multiline");break;case 35:this.popState();break;case 36:return"acc_descr_multiline_value";case 37:return 30;case 38:return this.popState(),T.getLogger().debug("Lex: (("),"NODE_DEND";break;case 39:return this.popState(),T.getLogger().debug("Lex: (("),"NODE_DEND";break;case 40:return this.popState(),T.getLogger().debug("Lex: ))"),"NODE_DEND";break;case 41:return this.popState(),T.getLogger().debug("Lex: (("),"NODE_DEND";break;case 42:return this.popState(),T.getLogger().debug("Lex: (("),"NODE_DEND";break;case 43:return this.popState(),T.getLogger().debug("Lex: (-"),"NODE_DEND";break;case 44:return this.popState(),T.getLogger().debug("Lex: -)"),"NODE_DEND";break;case 45:return this.popState(),T.getLogger().debug("Lex: (("),"NODE_DEND";break;case 46:return this.popState(),T.getLogger().debug("Lex: ]]"),"NODE_DEND";break;case 47:return this.popState(),T.getLogger().debug("Lex: ("),"NODE_DEND";break;case 48:return this.popState(),T.getLogger().debug("Lex: ])"),"NODE_DEND";break;case 49:return this.popState(),T.getLogger().debug("Lex: /]"),"NODE_DEND";break;case 50:return this.popState(),T.getLogger().debug("Lex: /]"),"NODE_DEND";break;case 51:return this.popState(),T.getLogger().debug("Lex: )]"),"NODE_DEND";break;case 52:return this.popState(),T.getLogger().debug("Lex: )"),"NODE_DEND";break;case 53:return this.popState(),T.getLogger().debug("Lex: ]>"),"NODE_DEND";break;case 54:return this.popState(),T.getLogger().debug("Lex: ]"),"NODE_DEND";break;case 55:return T.getLogger().debug("Lexa: -)"),this.pushState("NODE"),36;break;case 56:return T.getLogger().debug("Lexa: (-"),this.pushState("NODE"),36;break;case 57:return T.getLogger().debug("Lexa: ))"),this.pushState("NODE"),36;break;case 58:return T.getLogger().debug("Lexa: )"),this.pushState("NODE"),36;break;case 59:return T.getLogger().debug("Lex: ((("),this.pushState("NODE"),36;break;case 60:return T.getLogger().debug("Lexa: )"),this.pushState("NODE"),36;break;case 61:return T.getLogger().debug("Lexa: )"),this.pushState("NODE"),36;break;case 62:return T.getLogger().debug("Lexa: )"),this.pushState("NODE"),36;break;case 63:return T.getLogger().debug("Lexc: >"),this.pushState("NODE"),36;break;case 64:return T.getLogger().debug("Lexa: (["),this.pushState("NODE"),36;break;case 65:return T.getLogger().debug("Lexa: )"),this.pushState("NODE"),36;break;case 66:return this.pushState("NODE"),36;break;case 67:return this.pushState("NODE"),36;break;case 68:return this.pushState("NODE"),36;break;case 69:return this.pushState("NODE"),36;break;case 70:return this.pushState("NODE"),36;break;case 71:return this.pushState("NODE"),36;break;case 72:return this.pushState("NODE"),36;break;case 73:return T.getLogger().debug("Lexa: ["),this.pushState("NODE"),36;break;case 74:return this.pushState("BLOCK_ARROW"),T.getLogger().debug("LEX ARR START"),38;break;case 75:return T.getLogger().debug("Lex: NODE_ID",E.yytext),32;break;case 76:return T.getLogger().debug("Lex: EOF",E.yytext),8;break;case 77:this.pushState("md_string");break;case 78:this.pushState("md_string");break;case 79:return"NODE_DESCR";case 80:this.popState();break;case 81:T.getLogger().debug("Lex: Starting string"),this.pushState("string");break;case 82:T.getLogger().debug("LEX ARR: Starting string"),this.pushState("string");break;case 83:return T.getLogger().debug("LEX: NODE_DESCR:",E.yytext),"NODE_DESCR";break;case 84:T.getLogger().debug("LEX POPPING"),this.popState();break;case 85:T.getLogger().debug("Lex: =>BAE"),this.pushState("ARROW_DIR");break;case 86:return E.yytext=E.yytext.replace(/^,\s*/,""),T.getLogger().debug("Lex (right): dir:",E.yytext),"DIR";break;case 87:return E.yytext=E.yytext.replace(/^,\s*/,""),T.getLogger().debug("Lex (left):",E.yytext),"DIR";break;case 88:return E.yytext=E.yytext.replace(/^,\s*/,""),T.getLogger().debug("Lex (x):",E.yytext),"DIR";break;case 89:return E.yytext=E.yytext.replace(/^,\s*/,""),T.getLogger().debug("Lex (y):",E.yytext),"DIR";break;case 90:return E.yytext=E.yytext.replace(/^,\s*/,""),T.getLogger().debug("Lex (up):",E.yytext),"DIR";break;case 91:return E.yytext=E.yytext.replace(/^,\s*/,""),T.getLogger().debug("Lex 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this.popState(),T.getLogger().debug("Lex: LINK",E.yytext),15;break;case 104:return this.popState(),T.getLogger().debug("Lex: LINK",E.yytext),15;break;case 105:return T.getLogger().debug("Lex: 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a>s?l:1+l%4},i.getIntersection=function(a,s,l,u){if(u==null)return this.getIntersection2(a,s,l);var h=a.x,f=a.y,d=s.x,p=s.y,m=l.x,g=l.y,y=u.x,v=u.y,x=void 0,b=void 0,w=void 0,C=void 0,T=void 0,E=void 0,A=void 0,S=void 0,_=void 0;return w=p-f,T=h-d,A=d*f-h*p,C=v-g,E=m-y,S=y*g-m*v,_=w*E-C*T,_===0?null:(x=(T*S-E*A)/_,b=(C*A-w*S)/_,new n(x,b))},i.angleOfVector=function(a,s,l,u){var h=void 0;return a!==l?(h=Math.atan((u-s)/(l-a)),l=0){var v=(-m+Math.sqrt(m*m-4*p*g))/(2*p),x=(-m-Math.sqrt(m*m-4*p*g))/(2*p),b=null;return v>=0&&v<=1?[v]:x>=0&&x<=1?[x]:b}else return null},i.HALF_PI=.5*Math.PI,i.ONE_AND_HALF_PI=1.5*Math.PI,i.TWO_PI=2*Math.PI,i.THREE_PI=3*Math.PI,t.exports=i},function(t,e,r){"use strict";function n(){}o(n,"IMath"),n.sign=function(i){return i>0?1:i<0?-1:0},n.floor=function(i){return i<0?Math.ceil(i):Math.floor(i)},n.ceil=function(i){return i<0?Math.floor(i):Math.ceil(i)},t.exports=n},function(t,e,r){"use strict";function n(){}o(n,"Integer"),n.MAX_VALUE=2147483647,n.MIN_VALUE=-2147483648,t.exports=n},function(t,e,r){"use strict";var n=function(){function h(f,d){for(var p=0;p"u"?"undefined":n(a);return a==null||s!="object"&&s!="function"},t.exports=i},function(t,e,r){"use strict";function n(m){if(Array.isArray(m)){for(var g=0,y=Array(m.length);g0&&g;){for(w.push(T[0]);w.length>0&&g;){var E=w[0];w.splice(0,1),b.add(E);for(var A=E.getEdges(),x=0;x-1&&T.splice(D,1)}b=new Set,C=new Map}}return m},p.prototype.createDummyNodesForBendpoints=function(m){for(var g=[],y=m.source,v=this.graphManager.calcLowestCommonAncestor(m.source,m.target),x=0;x0){for(var v=this.edgeToDummyNodes.get(y),x=0;x=0&&g.splice(S,1);var _=C.getNeighborsList();_.forEach(function(k){if(y.indexOf(k)<0){var L=v.get(k),R=L-1;R==1&&E.push(k),v.set(k,R)}})}y=y.concat(E),(g.length==1||g.length==2)&&(x=!0,b=g[0])}return b},p.prototype.setGraphManager=function(m){this.graphManager=m},t.exports=p},function(t,e,r){"use strict";function n(){}o(n,"RandomSeed"),n.seed=1,n.x=0,n.nextDouble=function(){return n.x=Math.sin(n.seed++)*1e4,n.x-Math.floor(n.x)},t.exports=n},function(t,e,r){"use strict";var n=r(5);function i(a,s){this.lworldOrgX=0,this.lworldOrgY=0,this.ldeviceOrgX=0,this.ldeviceOrgY=0,this.lworldExtX=1,this.lworldExtY=1,this.ldeviceExtX=1,this.ldeviceExtY=1}o(i,"Transform"),i.prototype.getWorldOrgX=function(){return this.lworldOrgX},i.prototype.setWorldOrgX=function(a){this.lworldOrgX=a},i.prototype.getWorldOrgY=function(){return this.lworldOrgY},i.prototype.setWorldOrgY=function(a){this.lworldOrgY=a},i.prototype.getWorldExtX=function(){return this.lworldExtX},i.prototype.setWorldExtX=function(a){this.lworldExtX=a},i.prototype.getWorldExtY=function(){return this.lworldExtY},i.prototype.setWorldExtY=function(a){this.lworldExtY=a},i.prototype.getDeviceOrgX=function(){return this.ldeviceOrgX},i.prototype.setDeviceOrgX=function(a){this.ldeviceOrgX=a},i.prototype.getDeviceOrgY=function(){return this.ldeviceOrgY},i.prototype.setDeviceOrgY=function(a){this.ldeviceOrgY=a},i.prototype.getDeviceExtX=function(){return this.ldeviceExtX},i.prototype.setDeviceExtX=function(a){this.ldeviceExtX=a},i.prototype.getDeviceExtY=function(){return this.ldeviceExtY},i.prototype.setDeviceExtY=function(a){this.ldeviceExtY=a},i.prototype.transformX=function(a){var s=0,l=this.lworldExtX;return l!=0&&(s=this.ldeviceOrgX+(a-this.lworldOrgX)*this.ldeviceExtX/l),s},i.prototype.transformY=function(a){var s=0,l=this.lworldExtY;return l!=0&&(s=this.ldeviceOrgY+(a-this.lworldOrgY)*this.ldeviceExtY/l),s},i.prototype.inverseTransformX=function(a){var s=0,l=this.ldeviceExtX;return l!=0&&(s=this.lworldOrgX+(a-this.ldeviceOrgX)*this.lworldExtX/l),s},i.prototype.inverseTransformY=function(a){var s=0,l=this.ldeviceExtY;return l!=0&&(s=this.lworldOrgY+(a-this.ldeviceOrgY)*this.lworldExtY/l),s},i.prototype.inverseTransformPoint=function(a){var s=new n(this.inverseTransformX(a.x),this.inverseTransformY(a.y));return s},t.exports=i},function(t,e,r){"use strict";function n(d){if(Array.isArray(d)){for(var p=0,m=Array(d.length);pa.ADAPTATION_LOWER_NODE_LIMIT&&(this.coolingFactor=Math.max(this.coolingFactor*a.COOLING_ADAPTATION_FACTOR,this.coolingFactor-(d-a.ADAPTATION_LOWER_NODE_LIMIT)/(a.ADAPTATION_UPPER_NODE_LIMIT-a.ADAPTATION_LOWER_NODE_LIMIT)*this.coolingFactor*(1-a.COOLING_ADAPTATION_FACTOR))),this.maxNodeDisplacement=a.MAX_NODE_DISPLACEMENT_INCREMENTAL):(d>a.ADAPTATION_LOWER_NODE_LIMIT?this.coolingFactor=Math.max(a.COOLING_ADAPTATION_FACTOR,1-(d-a.ADAPTATION_LOWER_NODE_LIMIT)/(a.ADAPTATION_UPPER_NODE_LIMIT-a.ADAPTATION_LOWER_NODE_LIMIT)*(1-a.COOLING_ADAPTATION_FACTOR)):this.coolingFactor=1,this.initialCoolingFactor=this.coolingFactor,this.maxNodeDisplacement=a.MAX_NODE_DISPLACEMENT),this.maxIterations=Math.max(this.getAllNodes().length*5,this.maxIterations),this.displacementThresholdPerNode=3*a.DEFAULT_EDGE_LENGTH/100,this.totalDisplacementThreshold=this.displacementThresholdPerNode*this.getAllNodes().length,this.repulsionRange=this.calcRepulsionRange()},h.prototype.calcSpringForces=function(){for(var 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ae=s[L-2];s[L-2]=0;for(var Oe=L-2;Oe>=ue;Oe--){var ge=n.hypot(this.s[Oe],ae),ze=this.s[Oe]/ge,He=ae/ge;if(this.s[Oe]=ge,Oe!==ue&&(ae=-He*s[Oe-1],s[Oe-1]=ze*s[Oe-1]),h)for(var $e=0;$e=this.s[ue+1]);){var ot=this.s[ue];if(this.s[ue]=this.s[ue+1],this.s[ue+1]=ot,h&&ueMath.abs(a)?(s=a/i,s=Math.abs(i)*Math.sqrt(1+s*s)):a!=0?(s=i/a,s=Math.abs(a)*Math.sqrt(1+s*s)):s=0,s},t.exports=n},function(t,e,r){"use strict";var n=function(){function s(l,u){for(var h=0;h2&&arguments[2]!==void 0?arguments[2]:1,f=arguments.length>3&&arguments[3]!==void 0?arguments[3]:-1,d=arguments.length>4&&arguments[4]!==void 0?arguments[4]:-1;i(this,s),this.sequence1=l,this.sequence2=u,this.match_score=h,this.mismatch_penalty=f,this.gap_penalty=d,this.iMax=l.length+1,this.jMax=u.length+1,this.grid=new Array(this.iMax);for(var p=0;p=0;l--){var u=this.listeners[l];u.event===a&&u.callback===s&&this.listeners.splice(l,1)}},i.emit=function(a,s){for(var l=0;l{"use strict";o(function(e,r){typeof k4=="object"&&typeof pF=="object"?pF.exports=r(dF()):typeof define=="function"&&define.amd?define(["layout-base"],r):typeof k4=="object"?k4.coseBase=r(dF()):e.coseBase=r(e.layoutBase)},"webpackUniversalModuleDefinition")(k4,function(t){return(()=>{"use strict";var e={45:(a,s,l)=>{var u={};u.layoutBase=l(551),u.CoSEConstants=l(806),u.CoSEEdge=l(767),u.CoSEGraph=l(880),u.CoSEGraphManager=l(578),u.CoSELayout=l(765),u.CoSENode=l(991),u.ConstraintHandler=l(902),a.exports=u},806:(a,s,l)=>{var u=l(551).FDLayoutConstants;function h(){}o(h,"CoSEConstants");for(var f in u)h[f]=u[f];h.DEFAULT_USE_MULTI_LEVEL_SCALING=!1,h.DEFAULT_RADIAL_SEPARATION=u.DEFAULT_EDGE_LENGTH,h.DEFAULT_COMPONENT_SEPERATION=60,h.TILE=!0,h.TILING_PADDING_VERTICAL=10,h.TILING_PADDING_HORIZONTAL=10,h.TRANSFORM_ON_CONSTRAINT_HANDLING=!0,h.ENFORCE_CONSTRAINTS=!0,h.APPLY_LAYOUT=!0,h.RELAX_MOVEMENT_ON_CONSTRAINTS=!0,h.TREE_REDUCTION_ON_INCREMENTAL=!0,h.PURE_INCREMENTAL=h.DEFAULT_INCREMENTAL,a.exports=h},767:(a,s,l)=>{var u=l(551).FDLayoutEdge;function h(d,p,m){u.call(this,d,p,m)}o(h,"CoSEEdge"),h.prototype=Object.create(u.prototype);for(var f in u)h[f]=u[f];a.exports=h},880:(a,s,l)=>{var u=l(551).LGraph;function h(d,p,m){u.call(this,d,p,m)}o(h,"CoSEGraph"),h.prototype=Object.create(u.prototype);for(var f in u)h[f]=u[f];a.exports=h},578:(a,s,l)=>{var u=l(551).LGraphManager;function h(d){u.call(this,d)}o(h,"CoSEGraphManager"),h.prototype=Object.create(u.prototype);for(var f in u)h[f]=u[f];a.exports=h},765:(a,s,l)=>{var u=l(551).FDLayout,h=l(578),f=l(880),d=l(991),p=l(767),m=l(806),g=l(902),y=l(551).FDLayoutConstants,v=l(551).LayoutConstants,x=l(551).Point,b=l(551).PointD,w=l(551).DimensionD,C=l(551).Layout,T=l(551).Integer,E=l(551).IGeometry,A=l(551).LGraph,S=l(551).Transform,_=l(551).LinkedList;function I(){u.call(this),this.toBeTiled={},this.constraints={}}o(I,"CoSELayout"),I.prototype=Object.create(u.prototype);for(var D in u)I[D]=u[D];I.prototype.newGraphManager=function(){var k=new h(this);return this.graphManager=k,k},I.prototype.newGraph=function(k){return new f(null,this.graphManager,k)},I.prototype.newNode=function(k){return new d(this.graphManager,k)},I.prototype.newEdge=function(k){return new p(null,null,k)},I.prototype.initParameters=function(){u.prototype.initParameters.call(this,arguments),this.isSubLayout||(m.DEFAULT_EDGE_LENGTH<10?this.idealEdgeLength=10:this.idealEdgeLength=m.DEFAULT_EDGE_LENGTH,this.useSmartIdealEdgeLengthCalculation=m.DEFAULT_USE_SMART_IDEAL_EDGE_LENGTH_CALCULATION,this.gravityConstant=y.DEFAULT_GRAVITY_STRENGTH,this.compoundGravityConstant=y.DEFAULT_COMPOUND_GRAVITY_STRENGTH,this.gravityRangeFactor=y.DEFAULT_GRAVITY_RANGE_FACTOR,this.compoundGravityRangeFactor=y.DEFAULT_COMPOUND_GRAVITY_RANGE_FACTOR,this.prunedNodesAll=[],this.growTreeIterations=0,this.afterGrowthIterations=0,this.isTreeGrowing=!1,this.isGrowthFinished=!1)},I.prototype.initSpringEmbedder=function(){u.prototype.initSpringEmbedder.call(this),this.coolingCycle=0,this.maxCoolingCycle=this.maxIterations/y.CONVERGENCE_CHECK_PERIOD,this.finalTemperature=.04,this.coolingAdjuster=1},I.prototype.layout=function(){var k=v.DEFAULT_CREATE_BENDS_AS_NEEDED;return k&&(this.createBendpoints(),this.graphManager.resetAllEdges()),this.level=0,this.classicLayout()},I.prototype.classicLayout=function(){if(this.nodesWithGravity=this.calculateNodesToApplyGravitationTo(),this.graphManager.setAllNodesToApplyGravitation(this.nodesWithGravity),this.calcNoOfChildrenForAllNodes(),this.graphManager.calcLowestCommonAncestors(),this.graphManager.calcInclusionTreeDepths(),this.graphManager.getRoot().calcEstimatedSize(),this.calcIdealEdgeLengths(),this.incremental){if(m.TREE_REDUCTION_ON_INCREMENTAL){this.reduceTrees(),this.graphManager.resetAllNodesToApplyGravitation();var L=new Set(this.getAllNodes()),R=this.nodesWithGravity.filter(function(B){return L.has(B)});this.graphManager.setAllNodesToApplyGravitation(R)}}else{var k=this.getFlatForest();if(k.length>0)this.positionNodesRadially(k);else{this.reduceTrees(),this.graphManager.resetAllNodesToApplyGravitation();var L=new Set(this.getAllNodes()),R=this.nodesWithGravity.filter(function(O){return L.has(O)});this.graphManager.setAllNodesToApplyGravitation(R),this.positionNodesRandomly()}}return Object.keys(this.constraints).length>0&&(g.handleConstraints(this),this.initConstraintVariables()),this.initSpringEmbedder(),m.APPLY_LAYOUT&&this.runSpringEmbedder(),!0},I.prototype.tick=function(){if(this.totalIterations++,this.totalIterations===this.maxIterations&&!this.isTreeGrowing&&!this.isGrowthFinished)if(this.prunedNodesAll.length>0)this.isTreeGrowing=!0;else return!0;if(this.totalIterations%y.CONVERGENCE_CHECK_PERIOD==0&&!this.isTreeGrowing&&!this.isGrowthFinished){if(this.isConverged())if(this.prunedNodesAll.length>0)this.isTreeGrowing=!0;else return!0;this.coolingCycle++,this.layoutQuality==0?this.coolingAdjuster=this.coolingCycle:this.layoutQuality==1&&(this.coolingAdjuster=this.coolingCycle/3),this.coolingFactor=Math.max(this.initialCoolingFactor-Math.pow(this.coolingCycle,Math.log(100*(this.initialCoolingFactor-this.finalTemperature))/Math.log(this.maxCoolingCycle))/100*this.coolingAdjuster,this.finalTemperature),this.animationPeriod=Math.ceil(this.initialAnimationPeriod*Math.sqrt(this.coolingFactor))}if(this.isTreeGrowing){if(this.growTreeIterations%10==0)if(this.prunedNodesAll.length>0){this.graphManager.updateBounds(),this.updateGrid(),this.growTree(this.prunedNodesAll),this.graphManager.resetAllNodesToApplyGravitation();var k=new Set(this.getAllNodes()),L=this.nodesWithGravity.filter(function(M){return k.has(M)});this.graphManager.setAllNodesToApplyGravitation(L),this.graphManager.updateBounds(),this.updateGrid(),m.PURE_INCREMENTAL?this.coolingFactor=y.DEFAULT_COOLING_FACTOR_INCREMENTAL/2:this.coolingFactor=y.DEFAULT_COOLING_FACTOR_INCREMENTAL}else this.isTreeGrowing=!1,this.isGrowthFinished=!0;this.growTreeIterations++}if(this.isGrowthFinished){if(this.isConverged())return!0;this.afterGrowthIterations%10==0&&(this.graphManager.updateBounds(),this.updateGrid()),m.PURE_INCREMENTAL?this.coolingFactor=y.DEFAULT_COOLING_FACTOR_INCREMENTAL/2*((100-this.afterGrowthIterations)/100):this.coolingFactor=y.DEFAULT_COOLING_FACTOR_INCREMENTAL*((100-this.afterGrowthIterations)/100),this.afterGrowthIterations++}var R=!this.isTreeGrowing&&!this.isGrowthFinished,O=this.growTreeIterations%10==1&&this.isTreeGrowing||this.afterGrowthIterations%10==1&&this.isGrowthFinished;return this.totalDisplacement=0,this.graphManager.updateBounds(),this.calcSpringForces(),this.calcRepulsionForces(R,O),this.calcGravitationalForces(),this.moveNodes(),this.animate(),!1},I.prototype.getPositionsData=function(){for(var k=this.graphManager.getAllNodes(),L={},R=0;R0&&this.updateDisplacements();for(var R=0;R0&&(O.fixedNodeWeight=B)}}if(this.constraints.relativePlacementConstraint){var F=new Map,P=new Map;if(this.dummyToNodeForVerticalAlignment=new Map,this.dummyToNodeForHorizontalAlignment=new Map,this.fixedNodesOnHorizontal=new Set,this.fixedNodesOnVertical=new Set,this.fixedNodeSet.forEach(function(le){k.fixedNodesOnHorizontal.add(le),k.fixedNodesOnVertical.add(le)}),this.constraints.alignmentConstraint){if(this.constraints.alignmentConstraint.vertical)for(var z=this.constraints.alignmentConstraint.vertical,R=0;R=2*le.length/3;X--)he=Math.floor(Math.random()*(X+1)),K=le[X],le[X]=le[he],le[he]=K;return le},this.nodesInRelativeHorizontal=[],this.nodesInRelativeVertical=[],this.nodeToRelativeConstraintMapHorizontal=new Map,this.nodeToRelativeConstraintMapVertical=new Map,this.nodeToTempPositionMapHorizontal=new Map,this.nodeToTempPositionMapVertical=new Map,this.constraints.relativePlacementConstraint.forEach(function(le){if(le.left){var he=F.has(le.left)?F.get(le.left):le.left,K=F.has(le.right)?F.get(le.right):le.right;k.nodesInRelativeHorizontal.includes(he)||(k.nodesInRelativeHorizontal.push(he),k.nodeToRelativeConstraintMapHorizontal.set(he,[]),k.dummyToNodeForVerticalAlignment.has(he)?k.nodeToTempPositionMapHorizontal.set(he,k.idToNodeMap.get(k.dummyToNodeForVerticalAlignment.get(he)[0]).getCenterX()):k.nodeToTempPositionMapHorizontal.set(he,k.idToNodeMap.get(he).getCenterX())),k.nodesInRelativeHorizontal.includes(K)||(k.nodesInRelativeHorizontal.push(K),k.nodeToRelativeConstraintMapHorizontal.set(K,[]),k.dummyToNodeForVerticalAlignment.has(K)?k.nodeToTempPositionMapHorizontal.set(K,k.idToNodeMap.get(k.dummyToNodeForVerticalAlignment.get(K)[0]).getCenterX()):k.nodeToTempPositionMapHorizontal.set(K,k.idToNodeMap.get(K).getCenterX())),k.nodeToRelativeConstraintMapHorizontal.get(he).push({right:K,gap:le.gap}),k.nodeToRelativeConstraintMapHorizontal.get(K).push({left:he,gap:le.gap})}else{var X=P.has(le.top)?P.get(le.top):le.top,te=P.has(le.bottom)?P.get(le.bottom):le.bottom;k.nodesInRelativeVertical.includes(X)||(k.nodesInRelativeVertical.push(X),k.nodeToRelativeConstraintMapVertical.set(X,[]),k.dummyToNodeForHorizontalAlignment.has(X)?k.nodeToTempPositionMapVertical.set(X,k.idToNodeMap.get(k.dummyToNodeForHorizontalAlignment.get(X)[0]).getCenterY()):k.nodeToTempPositionMapVertical.set(X,k.idToNodeMap.get(X).getCenterY())),k.nodesInRelativeVertical.includes(te)||(k.nodesInRelativeVertical.push(te),k.nodeToRelativeConstraintMapVertical.set(te,[]),k.dummyToNodeForHorizontalAlignment.has(te)?k.nodeToTempPositionMapVertical.set(te,k.idToNodeMap.get(k.dummyToNodeForHorizontalAlignment.get(te)[0]).getCenterY()):k.nodeToTempPositionMapVertical.set(te,k.idToNodeMap.get(te).getCenterY())),k.nodeToRelativeConstraintMapVertical.get(X).push({bottom:te,gap:le.gap}),k.nodeToRelativeConstraintMapVertical.get(te).push({top:X,gap:le.gap})}});else{var H=new Map,Q=new Map;this.constraints.relativePlacementConstraint.forEach(function(le){if(le.left){var he=F.has(le.left)?F.get(le.left):le.left,K=F.has(le.right)?F.get(le.right):le.right;H.has(he)?H.get(he).push(K):H.set(he,[K]),H.has(K)?H.get(K).push(he):H.set(K,[he])}else{var X=P.has(le.top)?P.get(le.top):le.top,te=P.has(le.bottom)?P.get(le.bottom):le.bottom;Q.has(X)?Q.get(X).push(te):Q.set(X,[te]),Q.has(te)?Q.get(te).push(X):Q.set(te,[X])}});var j=o(function(he,K){var X=[],te=[],J=new _,se=new Set,ue=0;return he.forEach(function(Z,Se){if(!se.has(Se)){X[ue]=[],te[ue]=!1;var ce=Se;for(J.push(ce),se.add(ce),X[ue].push(ce);J.length!=0;){ce=J.shift(),K.has(ce)&&(te[ue]=!0);var ae=he.get(ce);ae.forEach(function(Oe){se.has(Oe)||(J.push(Oe),se.add(Oe),X[ue].push(Oe))})}ue++}}),{components:X,isFixed:te}},"constructComponents"),ie=j(H,k.fixedNodesOnHorizontal);this.componentsOnHorizontal=ie.components,this.fixedComponentsOnHorizontal=ie.isFixed;var ne=j(Q,k.fixedNodesOnVertical);this.componentsOnVertical=ne.components,this.fixedComponentsOnVertical=ne.isFixed}}},I.prototype.updateDisplacements=function(){var k=this;if(this.constraints.fixedNodeConstraint&&this.constraints.fixedNodeConstraint.forEach(function(ne){var le=k.idToNodeMap.get(ne.nodeId);le.displacementX=0,le.displacementY=0}),this.constraints.alignmentConstraint){if(this.constraints.alignmentConstraint.vertical)for(var L=this.constraints.alignmentConstraint.vertical,R=0;R1){var P;for(P=0;PO&&(O=Math.floor(F.y)),B=Math.floor(F.x+m.DEFAULT_COMPONENT_SEPERATION)}this.transform(new b(v.WORLD_CENTER_X-F.x/2,v.WORLD_CENTER_Y-F.y/2))},I.radialLayout=function(k,L,R){var O=Math.max(this.maxDiagonalInTree(k),m.DEFAULT_RADIAL_SEPARATION);I.branchRadialLayout(L,null,0,359,0,O);var M=A.calculateBounds(k),B=new S;B.setDeviceOrgX(M.getMinX()),B.setDeviceOrgY(M.getMinY()),B.setWorldOrgX(R.x),B.setWorldOrgY(R.y);for(var F=0;F1;){var X=K[0];K.splice(0,1);var te=j.indexOf(X);te>=0&&j.splice(te,1),le--,ie--}L!=null?he=(j.indexOf(K[0])+1)%le:he=0;for(var J=Math.abs(O-R)/ie,se=he;ne!=ie;se=++se%le){var ue=j[se].getOtherEnd(k);if(ue!=L){var Z=(R+ne*J)%360,Se=(Z+J)%360;I.branchRadialLayout(ue,k,Z,Se,M+B,B),ne++}}},I.maxDiagonalInTree=function(k){for(var L=T.MIN_VALUE,R=0;RL&&(L=M)}return L},I.prototype.calcRepulsionRange=function(){return 2*(this.level+1)*this.idealEdgeLength},I.prototype.groupZeroDegreeMembers=function(){var k=this,L={};this.memberGroups={},this.idToDummyNode={};for(var R=[],O=this.graphManager.getAllNodes(),M=0;M"u"&&(L[P]=[]),L[P]=L[P].concat(B)}Object.keys(L).forEach(function(z){if(L[z].length>1){var $="DummyCompound_"+z;k.memberGroups[$]=L[z];var H=L[z][0].getParent(),Q=new d(k.graphManager);Q.id=$,Q.paddingLeft=H.paddingLeft||0,Q.paddingRight=H.paddingRight||0,Q.paddingBottom=H.paddingBottom||0,Q.paddingTop=H.paddingTop||0,k.idToDummyNode[$]=Q;var j=k.getGraphManager().add(k.newGraph(),Q),ie=H.getChild();ie.add(Q);for(var ne=0;neM?(O.rect.x-=(O.labelWidth-M)/2,O.setWidth(O.labelWidth),O.labelMarginLeft=(O.labelWidth-M)/2):O.labelPosHorizontal=="right"&&O.setWidth(M+O.labelWidth)),O.labelHeight&&(O.labelPosVertical=="top"?(O.rect.y-=O.labelHeight,O.setHeight(B+O.labelHeight),O.labelMarginTop=O.labelHeight):O.labelPosVertical=="center"&&O.labelHeight>B?(O.rect.y-=(O.labelHeight-B)/2,O.setHeight(O.labelHeight),O.labelMarginTop=(O.labelHeight-B)/2):O.labelPosVertical=="bottom"&&O.setHeight(B+O.labelHeight))}})},I.prototype.repopulateCompounds=function(){for(var k=this.compoundOrder.length-1;k>=0;k--){var L=this.compoundOrder[k],R=L.id,O=L.paddingLeft,M=L.paddingTop,B=L.labelMarginLeft,F=L.labelMarginTop;this.adjustLocations(this.tiledMemberPack[R],L.rect.x,L.rect.y,O,M,B,F)}},I.prototype.repopulateZeroDegreeMembers=function(){var k=this,L=this.tiledZeroDegreePack;Object.keys(L).forEach(function(R){var O=k.idToDummyNode[R],M=O.paddingLeft,B=O.paddingTop,F=O.labelMarginLeft,P=O.labelMarginTop;k.adjustLocations(L[R],O.rect.x,O.rect.y,M,B,F,P)})},I.prototype.getToBeTiled=function(k){var L=k.id;if(this.toBeTiled[L]!=null)return this.toBeTiled[L];var R=k.getChild();if(R==null)return this.toBeTiled[L]=!1,!1;for(var O=R.getNodes(),M=0;M0)return this.toBeTiled[L]=!1,!1;if(B.getChild()==null){this.toBeTiled[B.id]=!1;continue}if(!this.getToBeTiled(B))return this.toBeTiled[L]=!1,!1}return this.toBeTiled[L]=!0,!0},I.prototype.getNodeDegree=function(k){for(var L=k.id,R=k.getEdges(),O=0,M=0;MH&&(H=j.rect.height)}R+=H+k.verticalPadding}},I.prototype.tileCompoundMembers=function(k,L){var R=this;this.tiledMemberPack=[],Object.keys(k).forEach(function(O){var M=L[O];if(R.tiledMemberPack[O]=R.tileNodes(k[O],M.paddingLeft+M.paddingRight),M.rect.width=R.tiledMemberPack[O].width,M.rect.height=R.tiledMemberPack[O].height,M.setCenter(R.tiledMemberPack[O].centerX,R.tiledMemberPack[O].centerY),M.labelMarginLeft=0,M.labelMarginTop=0,m.NODE_DIMENSIONS_INCLUDE_LABELS){var B=M.rect.width,F=M.rect.height;M.labelWidth&&(M.labelPosHorizontal=="left"?(M.rect.x-=M.labelWidth,M.setWidth(B+M.labelWidth),M.labelMarginLeft=M.labelWidth):M.labelPosHorizontal=="center"&&M.labelWidth>B?(M.rect.x-=(M.labelWidth-B)/2,M.setWidth(M.labelWidth),M.labelMarginLeft=(M.labelWidth-B)/2):M.labelPosHorizontal=="right"&&M.setWidth(B+M.labelWidth)),M.labelHeight&&(M.labelPosVertical=="top"?(M.rect.y-=M.labelHeight,M.setHeight(F+M.labelHeight),M.labelMarginTop=M.labelHeight):M.labelPosVertical=="center"&&M.labelHeight>F?(M.rect.y-=(M.labelHeight-F)/2,M.setHeight(M.labelHeight),M.labelMarginTop=(M.labelHeight-F)/2):M.labelPosVertical=="bottom"&&M.setHeight(F+M.labelHeight))}})},I.prototype.tileNodes=function(k,L){var R=this.tileNodesByFavoringDim(k,L,!0),O=this.tileNodesByFavoringDim(k,L,!1),M=this.getOrgRatio(R),B=this.getOrgRatio(O),F;return BP&&(P=ne.getWidth())});var z=B/M,$=F/M,H=Math.pow(R-O,2)+4*(z+O)*($+R)*M,Q=(O-R+Math.sqrt(H))/(2*(z+O)),j;L?(j=Math.ceil(Q),j==Q&&j++):j=Math.floor(Q);var ie=j*(z+O)-O;return P>ie&&(ie=P),ie+=O*2,ie},I.prototype.tileNodesByFavoringDim=function(k,L,R){var O=m.TILING_PADDING_VERTICAL,M=m.TILING_PADDING_HORIZONTAL,B=m.TILING_COMPARE_BY,F={rows:[],rowWidth:[],rowHeight:[],width:0,height:L,verticalPadding:O,horizontalPadding:M,centerX:0,centerY:0};B&&(F.idealRowWidth=this.calcIdealRowWidth(k,R));var P=o(function(le){return le.rect.width*le.rect.height},"getNodeArea"),z=o(function(le,he){return P(he)-P(le)},"areaCompareFcn");k.sort(function(ne,le){var he=z;return F.idealRowWidth?(he=B,he(ne.id,le.id)):he(ne,le)});for(var $=0,H=0,Q=0;Q0&&(F+=k.horizontalPadding),k.rowWidth[R]=F,k.width0&&(P+=k.verticalPadding);var z=0;P>k.rowHeight[R]&&(z=k.rowHeight[R],k.rowHeight[R]=P,z=k.rowHeight[R]-z),k.height+=z,k.rows[R].push(L)},I.prototype.getShortestRowIndex=function(k){for(var L=-1,R=Number.MAX_VALUE,O=0;OR&&(L=O,R=k.rowWidth[O]);return L},I.prototype.canAddHorizontal=function(k,L,R){if(k.idealRowWidth){var O=k.rows.length-1,M=k.rowWidth[O];return M+L+k.horizontalPadding<=k.idealRowWidth}var B=this.getShortestRowIndex(k);if(B<0)return!0;var F=k.rowWidth[B];if(F+k.horizontalPadding+L<=k.width)return!0;var P=0;k.rowHeight[B]0&&(P=R+k.verticalPadding-k.rowHeight[B]);var z;k.width-F>=L+k.horizontalPadding?z=(k.height+P)/(F+L+k.horizontalPadding):z=(k.height+P)/k.width,P=R+k.verticalPadding;var $;return k.widthB&&L!=R){O.splice(-1,1),k.rows[R].push(M),k.rowWidth[L]=k.rowWidth[L]-B,k.rowWidth[R]=k.rowWidth[R]+B,k.width=k.rowWidth[instance.getLongestRowIndex(k)];for(var F=Number.MIN_VALUE,P=0;PF&&(F=O[P].height);L>0&&(F+=k.verticalPadding);var z=k.rowHeight[L]+k.rowHeight[R];k.rowHeight[L]=F,k.rowHeight[R]0)for(var ie=M;ie<=B;ie++)j[0]+=this.grid[ie][F-1].length+this.grid[ie][F].length-1;if(B0)for(var ie=F;ie<=P;ie++)j[3]+=this.grid[M-1][ie].length+this.grid[M][ie].length-1;for(var ne=T.MAX_VALUE,le,he,K=0;K{var u=l(551).FDLayoutNode,h=l(551).IMath;function f(p,m,g,y){u.call(this,p,m,g,y)}o(f,"CoSENode"),f.prototype=Object.create(u.prototype);for(var d in u)f[d]=u[d];f.prototype.calculateDisplacement=function(){var p=this.graphManager.getLayout();this.getChild()!=null&&this.fixedNodeWeight?(this.displacementX+=p.coolingFactor*(this.springForceX+this.repulsionForceX+this.gravitationForceX)/this.fixedNodeWeight,this.displacementY+=p.coolingFactor*(this.springForceY+this.repulsionForceY+this.gravitationForceY)/this.fixedNodeWeight):(this.displacementX+=p.coolingFactor*(this.springForceX+this.repulsionForceX+this.gravitationForceX)/this.noOfChildren,this.displacementY+=p.coolingFactor*(this.springForceY+this.repulsionForceY+this.gravitationForceY)/this.noOfChildren),Math.abs(this.displacementX)>p.coolingFactor*p.maxNodeDisplacement&&(this.displacementX=p.coolingFactor*p.maxNodeDisplacement*h.sign(this.displacementX)),Math.abs(this.displacementY)>p.coolingFactor*p.maxNodeDisplacement&&(this.displacementY=p.coolingFactor*p.maxNodeDisplacement*h.sign(this.displacementY)),this.child&&this.child.getNodes().length>0&&this.propogateDisplacementToChildren(this.displacementX,this.displacementY)},f.prototype.propogateDisplacementToChildren=function(p,m){for(var g=this.getChild().getNodes(),y,v=0;v{function u(g){if(Array.isArray(g)){for(var y=0,v=Array(g.length);y0){var ct=0;Ue.forEach(function(ot){xe=="horizontal"?(we.set(ot,x.has(ot)?b[x.get(ot)]:pe.get(ot)),ct+=we.get(ot)):(we.set(ot,x.has(ot)?w[x.get(ot)]:pe.get(ot)),ct+=we.get(ot))}),ct=ct/Ue.length,st.forEach(function(ot){q.has(ot)||we.set(ot,ct)})}else{var We=0;st.forEach(function(ot){xe=="horizontal"?We+=x.has(ot)?b[x.get(ot)]:pe.get(ot):We+=x.has(ot)?w[x.get(ot)]:pe.get(ot)}),We=We/st.length,st.forEach(function(ot){we.set(ot,We)})}});for(var qe=o(function(){var Ue=De.shift(),ct=V.get(Ue);ct.forEach(function(We){if(we.get(We.id)ot&&(ot=yt),ntYt&&(Yt=nt)}}catch(At){Mt=!0,xt=At}finally{try{!bt&&ut.return&&ut.return()}finally{if(Mt)throw xt}}var dn=(ct+ot)/2-(We+Yt)/2,Tt=!0,On=!1,tn=void 0;try{for(var _r=st[Symbol.iterator](),Dr;!(Tt=(Dr=_r.next()).done);Tt=!0){var Pn=Dr.value;we.set(Pn,we.get(Pn)+dn)}}catch(At){On=!0,tn=At}finally{try{!Tt&&_r.return&&_r.return()}finally{if(On)throw tn}}})}return we},"findAppropriatePositionForRelativePlacement"),D=o(function(V){var xe=0,q=0,pe=0,ve=0;if(V.forEach(function(Ve){Ve.left?b[x.get(Ve.left)]-b[x.get(Ve.right)]>=0?xe++:q++:w[x.get(Ve.top)]-w[x.get(Ve.bottom)]>=0?pe++:ve++}),xe>q&&pe>ve)for(var Pe=0;Peq)for(var _e=0;_eve)for(var we=0;we1)y.fixedNodeConstraint.forEach(function(oe,V){O[V]=[oe.position.x,oe.position.y],M[V]=[b[x.get(oe.nodeId)],w[x.get(oe.nodeId)]]}),B=!0;else if(y.alignmentConstraint)(function(){var oe=0;if(y.alignmentConstraint.vertical){for(var V=y.alignmentConstraint.vertical,xe=o(function(we){var Ve=new Set;V[we].forEach(function(at){Ve.add(at)});var De=new Set([].concat(u(Ve)).filter(function(at){return P.has(at)})),qe=void 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te=void 0,J=d.transpose(O),se=d.transpose(M),ue=0;ue0){var ze={x:0,y:0};y.fixedNodeConstraint.forEach(function(oe,V){var xe={x:b[x.get(oe.nodeId)],y:w[x.get(oe.nodeId)]},q=oe.position,pe=S(q,xe);ze.x+=pe.x,ze.y+=pe.y}),ze.x/=y.fixedNodeConstraint.length,ze.y/=y.fixedNodeConstraint.length,b.forEach(function(oe,V){b[V]+=ze.x}),w.forEach(function(oe,V){w[V]+=ze.y}),y.fixedNodeConstraint.forEach(function(oe){b[x.get(oe.nodeId)]=oe.position.x,w[x.get(oe.nodeId)]=oe.position.y})}if(y.alignmentConstraint){if(y.alignmentConstraint.vertical)for(var He=y.alignmentConstraint.vertical,$e=o(function(V){var xe=new Set;He[V].forEach(function(ve){xe.add(ve)});var q=new Set([].concat(u(xe)).filter(function(ve){return P.has(ve)})),pe=void 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this.rect.x},h.prototype.getRight=function(){return this.rect.x+this.rect.width},h.prototype.getTop=function(){return this.rect.y},h.prototype.getBottom=function(){return this.rect.y+this.rect.height},h.prototype.getParent=function(){return this.owner==null?null:this.owner.getParent()},t.exports=h},function(t,e,r){"use strict";var n=r(0);function i(){}o(i,"FDLayoutConstants");for(var a in n)i[a]=n[a];i.MAX_ITERATIONS=2500,i.DEFAULT_EDGE_LENGTH=50,i.DEFAULT_SPRING_STRENGTH=.45,i.DEFAULT_REPULSION_STRENGTH=4500,i.DEFAULT_GRAVITY_STRENGTH=.4,i.DEFAULT_COMPOUND_GRAVITY_STRENGTH=1,i.DEFAULT_GRAVITY_RANGE_FACTOR=3.8,i.DEFAULT_COMPOUND_GRAVITY_RANGE_FACTOR=1.5,i.DEFAULT_USE_SMART_IDEAL_EDGE_LENGTH_CALCULATION=!0,i.DEFAULT_USE_SMART_REPULSION_RANGE_CALCULATION=!0,i.DEFAULT_COOLING_FACTOR_INCREMENTAL=.3,i.COOLING_ADAPTATION_FACTOR=.33,i.ADAPTATION_LOWER_NODE_LIMIT=1e3,i.ADAPTATION_UPPER_NODE_LIMIT=5e3,i.MAX_NODE_DISPLACEMENT_INCREMENTAL=100,i.MAX_NODE_DISPLACEMENT=i.MAX_NODE_DISPLACEMENT_INCREMENTAL*3,i.MIN_REPULSION_DIST=i.DEFAULT_EDGE_LENGTH/10,i.CONVERGENCE_CHECK_PERIOD=100,i.PER_LEVEL_IDEAL_EDGE_LENGTH_FACTOR=.1,i.MIN_EDGE_LENGTH=1,i.GRID_CALCULATION_CHECK_PERIOD=10,t.exports=i},function(t,e,r){"use strict";function n(i,a){i==null&&a==null?(this.x=0,this.y=0):(this.x=i,this.y=a)}o(n,"PointD"),n.prototype.getX=function(){return this.x},n.prototype.getY=function(){return 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_=0;v.forEach(function(I){I.owner==g&&_++}),_==this.nodes.length&&(this.isConnected=!0)}},t.exports=p},function(t,e,r){"use strict";var n,i=r(1);function a(s){n=r(6),this.layout=s,this.graphs=[],this.edges=[]}o(a,"LGraphManager"),a.prototype.addRoot=function(){var s=this.layout.newGraph(),l=this.layout.newNode(null),u=this.add(s,l);return this.setRootGraph(u),this.rootGraph},a.prototype.add=function(s,l,u,h,f){if(u==null&&h==null&&f==null){if(s==null)throw"Graph is null!";if(l==null)throw"Parent node is null!";if(this.graphs.indexOf(s)>-1)throw"Graph already in this graph mgr!";if(this.graphs.push(s),s.parent!=null)throw"Already has a parent!";if(l.child!=null)throw"Already has a child!";return s.parent=l,l.child=s,s}else{f=u,h=l,u=s;var d=h.getOwner(),p=f.getOwner();if(!(d!=null&&d.getGraphManager()==this))throw"Source not in this graph mgr!";if(!(p!=null&&p.getGraphManager()==this))throw"Target not in this graph mgr!";if(d==p)return 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a>s?l:1+l%4},i.getIntersection=function(a,s,l,u){if(u==null)return this.getIntersection2(a,s,l);var h=a.x,f=a.y,d=s.x,p=s.y,m=l.x,g=l.y,y=u.x,v=u.y,x=void 0,b=void 0,w=void 0,C=void 0,T=void 0,E=void 0,A=void 0,S=void 0,_=void 0;return w=p-f,T=h-d,A=d*f-h*p,C=v-g,E=m-y,S=y*g-m*v,_=w*E-C*T,_===0?null:(x=(T*S-E*A)/_,b=(C*A-w*S)/_,new n(x,b))},i.angleOfVector=function(a,s,l,u){var h=void 0;return a!==l?(h=Math.atan((u-s)/(l-a)),l=0){var v=(-m+Math.sqrt(m*m-4*p*g))/(2*p),x=(-m-Math.sqrt(m*m-4*p*g))/(2*p),b=null;return v>=0&&v<=1?[v]:x>=0&&x<=1?[x]:b}else return null},i.HALF_PI=.5*Math.PI,i.ONE_AND_HALF_PI=1.5*Math.PI,i.TWO_PI=2*Math.PI,i.THREE_PI=3*Math.PI,t.exports=i},function(t,e,r){"use strict";function n(){}o(n,"IMath"),n.sign=function(i){return i>0?1:i<0?-1:0},n.floor=function(i){return i<0?Math.ceil(i):Math.floor(i)},n.ceil=function(i){return i<0?Math.floor(i):Math.ceil(i)},t.exports=n},function(t,e,r){"use strict";function n(){}o(n,"Integer"),n.MAX_VALUE=2147483647,n.MIN_VALUE=-2147483648,t.exports=n},function(t,e,r){"use strict";var n=function(){function h(f,d){for(var p=0;p"u"?"undefined":n(a);return a==null||s!="object"&&s!="function"},t.exports=i},function(t,e,r){"use strict";function n(m){if(Array.isArray(m)){for(var g=0,y=Array(m.length);g0&&g;){for(w.push(T[0]);w.length>0&&g;){var E=w[0];w.splice(0,1),b.add(E);for(var A=E.getEdges(),x=0;x-1&&T.splice(L,1)}b=new Set,C=new Map}}return m},p.prototype.createDummyNodesForBendpoints=function(m){for(var g=[],y=m.source,v=this.graphManager.calcLowestCommonAncestor(m.source,m.target),x=0;x0){for(var v=this.edgeToDummyNodes.get(y),x=0;x=0&&g.splice(S,1);var _=C.getNeighborsList();_.forEach(function(k){if(y.indexOf(k)<0){var D=v.get(k),R=D-1;R==1&&E.push(k),v.set(k,R)}})}y=y.concat(E),(g.length==1||g.length==2)&&(x=!0,b=g[0])}return b},p.prototype.setGraphManager=function(m){this.graphManager=m},t.exports=p},function(t,e,r){"use strict";function n(){}o(n,"RandomSeed"),n.seed=1,n.x=0,n.nextDouble=function(){return n.x=Math.sin(n.seed++)*1e4,n.x-Math.floor(n.x)},t.exports=n},function(t,e,r){"use strict";var n=r(5);function i(a,s){this.lworldOrgX=0,this.lworldOrgY=0,this.ldeviceOrgX=0,this.ldeviceOrgY=0,this.lworldExtX=1,this.lworldExtY=1,this.ldeviceExtX=1,this.ldeviceExtY=1}o(i,"Transform"),i.prototype.getWorldOrgX=function(){return this.lworldOrgX},i.prototype.setWorldOrgX=function(a){this.lworldOrgX=a},i.prototype.getWorldOrgY=function(){return this.lworldOrgY},i.prototype.setWorldOrgY=function(a){this.lworldOrgY=a},i.prototype.getWorldExtX=function(){return this.lworldExtX},i.prototype.setWorldExtX=function(a){this.lworldExtX=a},i.prototype.getWorldExtY=function(){return this.lworldExtY},i.prototype.setWorldExtY=function(a){this.lworldExtY=a},i.prototype.getDeviceOrgX=function(){return this.ldeviceOrgX},i.prototype.setDeviceOrgX=function(a){this.ldeviceOrgX=a},i.prototype.getDeviceOrgY=function(){return this.ldeviceOrgY},i.prototype.setDeviceOrgY=function(a){this.ldeviceOrgY=a},i.prototype.getDeviceExtX=function(){return this.ldeviceExtX},i.prototype.setDeviceExtX=function(a){this.ldeviceExtX=a},i.prototype.getDeviceExtY=function(){return this.ldeviceExtY},i.prototype.setDeviceExtY=function(a){this.ldeviceExtY=a},i.prototype.transformX=function(a){var s=0,l=this.lworldExtX;return l!=0&&(s=this.ldeviceOrgX+(a-this.lworldOrgX)*this.ldeviceExtX/l),s},i.prototype.transformY=function(a){var s=0,l=this.lworldExtY;return l!=0&&(s=this.ldeviceOrgY+(a-this.lworldOrgY)*this.ldeviceExtY/l),s},i.prototype.inverseTransformX=function(a){var s=0,l=this.ldeviceExtX;return l!=0&&(s=this.lworldOrgX+(a-this.ldeviceOrgX)*this.lworldExtX/l),s},i.prototype.inverseTransformY=function(a){var s=0,l=this.ldeviceExtY;return l!=0&&(s=this.lworldOrgY+(a-this.ldeviceOrgY)*this.lworldExtY/l),s},i.prototype.inverseTransformPoint=function(a){var s=new n(this.inverseTransformX(a.x),this.inverseTransformY(a.y));return 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1:{var ae=s[D-2];s[D-2]=0;for(var Oe=D-2;Oe>=le;Oe--){var ye=n.hypot(this.s[Oe],ae),Be=this.s[Oe]/ye,He=ae/ye;if(this.s[Oe]=ye,Oe!==le&&(ae=-He*s[Oe-1],s[Oe-1]=Be*s[Oe-1]),h)for(var ze=0;ze=this.s[le+1]);){var ot=this.s[le];if(this.s[le]=this.s[le+1],this.s[le+1]=ot,h&&leMath.abs(a)?(s=a/i,s=Math.abs(i)*Math.sqrt(1+s*s)):a!=0?(s=i/a,s=Math.abs(a)*Math.sqrt(1+s*s)):s=0,s},t.exports=n},function(t,e,r){"use strict";var n=function(){function s(l,u){for(var h=0;h2&&arguments[2]!==void 0?arguments[2]:1,f=arguments.length>3&&arguments[3]!==void 0?arguments[3]:-1,d=arguments.length>4&&arguments[4]!==void 0?arguments[4]:-1;i(this,s),this.sequence1=l,this.sequence2=u,this.match_score=h,this.mismatch_penalty=f,this.gap_penalty=d,this.iMax=l.length+1,this.jMax=u.length+1,this.grid=new Array(this.iMax);for(var p=0;p=0;l--){var u=this.listeners[l];u.event===a&&u.callback===s&&this.listeners.splice(l,1)}},i.emit=function(a,s){for(var l=0;l{"use strict";o(function(e,r){typeof L4=="object"&&typeof yF=="object"?yF.exports=r(gF()):typeof define=="function"&&define.amd?define(["layout-base"],r):typeof L4=="object"?L4.coseBase=r(gF()):e.coseBase=r(e.layoutBase)},"webpackUniversalModuleDefinition")(L4,function(t){return(()=>{"use strict";var e={45:(a,s,l)=>{var u={};u.layoutBase=l(551),u.CoSEConstants=l(806),u.CoSEEdge=l(767),u.CoSEGraph=l(880),u.CoSEGraphManager=l(578),u.CoSELayout=l(765),u.CoSENode=l(991),u.ConstraintHandler=l(902),a.exports=u},806:(a,s,l)=>{var u=l(551).FDLayoutConstants;function h(){}o(h,"CoSEConstants");for(var f in u)h[f]=u[f];h.DEFAULT_USE_MULTI_LEVEL_SCALING=!1,h.DEFAULT_RADIAL_SEPARATION=u.DEFAULT_EDGE_LENGTH,h.DEFAULT_COMPONENT_SEPERATION=60,h.TILE=!0,h.TILING_PADDING_VERTICAL=10,h.TILING_PADDING_HORIZONTAL=10,h.TRANSFORM_ON_CONSTRAINT_HANDLING=!0,h.ENFORCE_CONSTRAINTS=!0,h.APPLY_LAYOUT=!0,h.RELAX_MOVEMENT_ON_CONSTRAINTS=!0,h.TREE_REDUCTION_ON_INCREMENTAL=!0,h.PURE_INCREMENTAL=h.DEFAULT_INCREMENTAL,a.exports=h},767:(a,s,l)=>{var u=l(551).FDLayoutEdge;function h(d,p,m){u.call(this,d,p,m)}o(h,"CoSEEdge"),h.prototype=Object.create(u.prototype);for(var f in u)h[f]=u[f];a.exports=h},880:(a,s,l)=>{var u=l(551).LGraph;function h(d,p,m){u.call(this,d,p,m)}o(h,"CoSEGraph"),h.prototype=Object.create(u.prototype);for(var f in u)h[f]=u[f];a.exports=h},578:(a,s,l)=>{var u=l(551).LGraphManager;function h(d){u.call(this,d)}o(h,"CoSEGraphManager"),h.prototype=Object.create(u.prototype);for(var f in u)h[f]=u[f];a.exports=h},765:(a,s,l)=>{var u=l(551).FDLayout,h=l(578),f=l(880),d=l(991),p=l(767),m=l(806),g=l(902),y=l(551).FDLayoutConstants,v=l(551).LayoutConstants,x=l(551).Point,b=l(551).PointD,w=l(551).DimensionD,C=l(551).Layout,T=l(551).Integer,E=l(551).IGeometry,A=l(551).LGraph,S=l(551).Transform,_=l(551).LinkedList;function I(){u.call(this),this.toBeTiled={},this.constraints={}}o(I,"CoSELayout"),I.prototype=Object.create(u.prototype);for(var L in u)I[L]=u[L];I.prototype.newGraphManager=function(){var k=new h(this);return this.graphManager=k,k},I.prototype.newGraph=function(k){return new f(null,this.graphManager,k)},I.prototype.newNode=function(k){return new d(this.graphManager,k)},I.prototype.newEdge=function(k){return new p(null,null,k)},I.prototype.initParameters=function(){u.prototype.initParameters.call(this,arguments),this.isSubLayout||(m.DEFAULT_EDGE_LENGTH<10?this.idealEdgeLength=10:this.idealEdgeLength=m.DEFAULT_EDGE_LENGTH,this.useSmartIdealEdgeLengthCalculation=m.DEFAULT_USE_SMART_IDEAL_EDGE_LENGTH_CALCULATION,this.gravityConstant=y.DEFAULT_GRAVITY_STRENGTH,this.compoundGravityConstant=y.DEFAULT_COMPOUND_GRAVITY_STRENGTH,this.gravityRangeFactor=y.DEFAULT_GRAVITY_RANGE_FACTOR,this.compoundGravityRangeFactor=y.DEFAULT_COMPOUND_GRAVITY_RANGE_FACTOR,this.prunedNodesAll=[],this.growTreeIterations=0,this.afterGrowthIterations=0,this.isTreeGrowing=!1,this.isGrowthFinished=!1)},I.prototype.initSpringEmbedder=function(){u.prototype.initSpringEmbedder.call(this),this.coolingCycle=0,this.maxCoolingCycle=this.maxIterations/y.CONVERGENCE_CHECK_PERIOD,this.finalTemperature=.04,this.coolingAdjuster=1},I.prototype.layout=function(){var k=v.DEFAULT_CREATE_BENDS_AS_NEEDED;return k&&(this.createBendpoints(),this.graphManager.resetAllEdges()),this.level=0,this.classicLayout()},I.prototype.classicLayout=function(){if(this.nodesWithGravity=this.calculateNodesToApplyGravitationTo(),this.graphManager.setAllNodesToApplyGravitation(this.nodesWithGravity),this.calcNoOfChildrenForAllNodes(),this.graphManager.calcLowestCommonAncestors(),this.graphManager.calcInclusionTreeDepths(),this.graphManager.getRoot().calcEstimatedSize(),this.calcIdealEdgeLengths(),this.incremental){if(m.TREE_REDUCTION_ON_INCREMENTAL){this.reduceTrees(),this.graphManager.resetAllNodesToApplyGravitation();var D=new Set(this.getAllNodes()),R=this.nodesWithGravity.filter(function(P){return D.has(P)});this.graphManager.setAllNodesToApplyGravitation(R)}}else{var k=this.getFlatForest();if(k.length>0)this.positionNodesRadially(k);else{this.reduceTrees(),this.graphManager.resetAllNodesToApplyGravitation();var D=new Set(this.getAllNodes()),R=this.nodesWithGravity.filter(function(O){return D.has(O)});this.graphManager.setAllNodesToApplyGravitation(R),this.positionNodesRandomly()}}return Object.keys(this.constraints).length>0&&(g.handleConstraints(this),this.initConstraintVariables()),this.initSpringEmbedder(),m.APPLY_LAYOUT&&this.runSpringEmbedder(),!0},I.prototype.tick=function(){if(this.totalIterations++,this.totalIterations===this.maxIterations&&!this.isTreeGrowing&&!this.isGrowthFinished)if(this.prunedNodesAll.length>0)this.isTreeGrowing=!0;else return!0;if(this.totalIterations%y.CONVERGENCE_CHECK_PERIOD==0&&!this.isTreeGrowing&&!this.isGrowthFinished){if(this.isConverged())if(this.prunedNodesAll.length>0)this.isTreeGrowing=!0;else return!0;this.coolingCycle++,this.layoutQuality==0?this.coolingAdjuster=this.coolingCycle:this.layoutQuality==1&&(this.coolingAdjuster=this.coolingCycle/3),this.coolingFactor=Math.max(this.initialCoolingFactor-Math.pow(this.coolingCycle,Math.log(100*(this.initialCoolingFactor-this.finalTemperature))/Math.log(this.maxCoolingCycle))/100*this.coolingAdjuster,this.finalTemperature),this.animationPeriod=Math.ceil(this.initialAnimationPeriod*Math.sqrt(this.coolingFactor))}if(this.isTreeGrowing){if(this.growTreeIterations%10==0)if(this.prunedNodesAll.length>0){this.graphManager.updateBounds(),this.updateGrid(),this.growTree(this.prunedNodesAll),this.graphManager.resetAllNodesToApplyGravitation();var k=new Set(this.getAllNodes()),D=this.nodesWithGravity.filter(function(M){return k.has(M)});this.graphManager.setAllNodesToApplyGravitation(D),this.graphManager.updateBounds(),this.updateGrid(),m.PURE_INCREMENTAL?this.coolingFactor=y.DEFAULT_COOLING_FACTOR_INCREMENTAL/2:this.coolingFactor=y.DEFAULT_COOLING_FACTOR_INCREMENTAL}else this.isTreeGrowing=!1,this.isGrowthFinished=!0;this.growTreeIterations++}if(this.isGrowthFinished){if(this.isConverged())return!0;this.afterGrowthIterations%10==0&&(this.graphManager.updateBounds(),this.updateGrid()),m.PURE_INCREMENTAL?this.coolingFactor=y.DEFAULT_COOLING_FACTOR_INCREMENTAL/2*((100-this.afterGrowthIterations)/100):this.coolingFactor=y.DEFAULT_COOLING_FACTOR_INCREMENTAL*((100-this.afterGrowthIterations)/100),this.afterGrowthIterations++}var R=!this.isTreeGrowing&&!this.isGrowthFinished,O=this.growTreeIterations%10==1&&this.isTreeGrowing||this.afterGrowthIterations%10==1&&this.isGrowthFinished;return this.totalDisplacement=0,this.graphManager.updateBounds(),this.calcSpringForces(),this.calcRepulsionForces(R,O),this.calcGravitationalForces(),this.moveNodes(),this.animate(),!1},I.prototype.getPositionsData=function(){for(var k=this.graphManager.getAllNodes(),D={},R=0;R0&&this.updateDisplacements();for(var R=0;R0&&(O.fixedNodeWeight=P)}}if(this.constraints.relativePlacementConstraint){var B=new Map,F=new Map;if(this.dummyToNodeForVerticalAlignment=new Map,this.dummyToNodeForHorizontalAlignment=new Map,this.fixedNodesOnHorizontal=new Set,this.fixedNodesOnVertical=new Set,this.fixedNodeSet.forEach(function(Z){k.fixedNodesOnHorizontal.add(Z),k.fixedNodesOnVertical.add(Z)}),this.constraints.alignmentConstraint){if(this.constraints.alignmentConstraint.vertical)for(var z=this.constraints.alignmentConstraint.vertical,R=0;R=2*Z.length/3;j--)ue=Math.floor(Math.random()*(j+1)),K=Z[j],Z[j]=Z[ue],Z[ue]=K;return Z},this.nodesInRelativeHorizontal=[],this.nodesInRelativeVertical=[],this.nodeToRelativeConstraintMapHorizontal=new Map,this.nodeToRelativeConstraintMapVertical=new Map,this.nodeToTempPositionMapHorizontal=new Map,this.nodeToTempPositionMapVertical=new Map,this.constraints.relativePlacementConstraint.forEach(function(Z){if(Z.left){var ue=B.has(Z.left)?B.get(Z.left):Z.left,K=B.has(Z.right)?B.get(Z.right):Z.right;k.nodesInRelativeHorizontal.includes(ue)||(k.nodesInRelativeHorizontal.push(ue),k.nodeToRelativeConstraintMapHorizontal.set(ue,[]),k.dummyToNodeForVerticalAlignment.has(ue)?k.nodeToTempPositionMapHorizontal.set(ue,k.idToNodeMap.get(k.dummyToNodeForVerticalAlignment.get(ue)[0]).getCenterX()):k.nodeToTempPositionMapHorizontal.set(ue,k.idToNodeMap.get(ue).getCenterX())),k.nodesInRelativeHorizontal.includes(K)||(k.nodesInRelativeHorizontal.push(K),k.nodeToRelativeConstraintMapHorizontal.set(K,[]),k.dummyToNodeForVerticalAlignment.has(K)?k.nodeToTempPositionMapHorizontal.set(K,k.idToNodeMap.get(k.dummyToNodeForVerticalAlignment.get(K)[0]).getCenterX()):k.nodeToTempPositionMapHorizontal.set(K,k.idToNodeMap.get(K).getCenterX())),k.nodeToRelativeConstraintMapHorizontal.get(ue).push({right:K,gap:Z.gap}),k.nodeToRelativeConstraintMapHorizontal.get(K).push({left:ue,gap:Z.gap})}else{var j=F.has(Z.top)?F.get(Z.top):Z.top,ne=F.has(Z.bottom)?F.get(Z.bottom):Z.bottom;k.nodesInRelativeVertical.includes(j)||(k.nodesInRelativeVertical.push(j),k.nodeToRelativeConstraintMapVertical.set(j,[]),k.dummyToNodeForHorizontalAlignment.has(j)?k.nodeToTempPositionMapVertical.set(j,k.idToNodeMap.get(k.dummyToNodeForHorizontalAlignment.get(j)[0]).getCenterY()):k.nodeToTempPositionMapVertical.set(j,k.idToNodeMap.get(j).getCenterY())),k.nodesInRelativeVertical.includes(ne)||(k.nodesInRelativeVertical.push(ne),k.nodeToRelativeConstraintMapVertical.set(ne,[]),k.dummyToNodeForHorizontalAlignment.has(ne)?k.nodeToTempPositionMapVertical.set(ne,k.idToNodeMap.get(k.dummyToNodeForHorizontalAlignment.get(ne)[0]).getCenterY()):k.nodeToTempPositionMapVertical.set(ne,k.idToNodeMap.get(ne).getCenterY())),k.nodeToRelativeConstraintMapVertical.get(j).push({bottom:ne,gap:Z.gap}),k.nodeToRelativeConstraintMapVertical.get(ne).push({top:j,gap:Z.gap})}});else{var U=new Map,Q=new Map;this.constraints.relativePlacementConstraint.forEach(function(Z){if(Z.left){var ue=B.has(Z.left)?B.get(Z.left):Z.left,K=B.has(Z.right)?B.get(Z.right):Z.right;U.has(ue)?U.get(ue).push(K):U.set(ue,[K]),U.has(K)?U.get(K).push(ue):U.set(K,[ue])}else{var j=F.has(Z.top)?F.get(Z.top):Z.top,ne=F.has(Z.bottom)?F.get(Z.bottom):Z.bottom;Q.has(j)?Q.get(j).push(ne):Q.set(j,[ne]),Q.has(ne)?Q.get(ne).push(j):Q.set(ne,[j])}});var te=o(function(ue,K){var j=[],ne=[],ee=new _,ce=new Set,le=0;return ue.forEach(function(J,Se){if(!ce.has(Se)){j[le]=[],ne[le]=!1;var se=Se;for(ee.push(se),ce.add(se),j[le].push(se);ee.length!=0;){se=ee.shift(),K.has(se)&&(ne[le]=!0);var ae=ue.get(se);ae.forEach(function(Oe){ce.has(Oe)||(ee.push(Oe),ce.add(Oe),j[le].push(Oe))})}le++}}),{components:j,isFixed:ne}},"constructComponents"),Y=te(U,k.fixedNodesOnHorizontal);this.componentsOnHorizontal=Y.components,this.fixedComponentsOnHorizontal=Y.isFixed;var he=te(Q,k.fixedNodesOnVertical);this.componentsOnVertical=he.components,this.fixedComponentsOnVertical=he.isFixed}}},I.prototype.updateDisplacements=function(){var k=this;if(this.constraints.fixedNodeConstraint&&this.constraints.fixedNodeConstraint.forEach(function(he){var Z=k.idToNodeMap.get(he.nodeId);Z.displacementX=0,Z.displacementY=0}),this.constraints.alignmentConstraint){if(this.constraints.alignmentConstraint.vertical)for(var D=this.constraints.alignmentConstraint.vertical,R=0;R1){var F;for(F=0;FO&&(O=Math.floor(B.y)),P=Math.floor(B.x+m.DEFAULT_COMPONENT_SEPERATION)}this.transform(new b(v.WORLD_CENTER_X-B.x/2,v.WORLD_CENTER_Y-B.y/2))},I.radialLayout=function(k,D,R){var O=Math.max(this.maxDiagonalInTree(k),m.DEFAULT_RADIAL_SEPARATION);I.branchRadialLayout(D,null,0,359,0,O);var M=A.calculateBounds(k),P=new S;P.setDeviceOrgX(M.getMinX()),P.setDeviceOrgY(M.getMinY()),P.setWorldOrgX(R.x),P.setWorldOrgY(R.y);for(var B=0;B1;){var j=K[0];K.splice(0,1);var ne=te.indexOf(j);ne>=0&&te.splice(ne,1),Z--,Y--}D!=null?ue=(te.indexOf(K[0])+1)%Z:ue=0;for(var ee=Math.abs(O-R)/Y,ce=ue;he!=Y;ce=++ce%Z){var le=te[ce].getOtherEnd(k);if(le!=D){var J=(R+he*ee)%360,Se=(J+ee)%360;I.branchRadialLayout(le,k,J,Se,M+P,P),he++}}},I.maxDiagonalInTree=function(k){for(var D=T.MIN_VALUE,R=0;RD&&(D=M)}return D},I.prototype.calcRepulsionRange=function(){return 2*(this.level+1)*this.idealEdgeLength},I.prototype.groupZeroDegreeMembers=function(){var k=this,D={};this.memberGroups={},this.idToDummyNode={};for(var R=[],O=this.graphManager.getAllNodes(),M=0;M"u"&&(D[F]=[]),D[F]=D[F].concat(P)}Object.keys(D).forEach(function(z){if(D[z].length>1){var $="DummyCompound_"+z;k.memberGroups[$]=D[z];var U=D[z][0].getParent(),Q=new d(k.graphManager);Q.id=$,Q.paddingLeft=U.paddingLeft||0,Q.paddingRight=U.paddingRight||0,Q.paddingBottom=U.paddingBottom||0,Q.paddingTop=U.paddingTop||0,k.idToDummyNode[$]=Q;var te=k.getGraphManager().add(k.newGraph(),Q),Y=U.getChild();Y.add(Q);for(var he=0;heM?(O.rect.x-=(O.labelWidth-M)/2,O.setWidth(O.labelWidth),O.labelMarginLeft=(O.labelWidth-M)/2):O.labelPosHorizontal=="right"&&O.setWidth(M+O.labelWidth)),O.labelHeight&&(O.labelPosVertical=="top"?(O.rect.y-=O.labelHeight,O.setHeight(P+O.labelHeight),O.labelMarginTop=O.labelHeight):O.labelPosVertical=="center"&&O.labelHeight>P?(O.rect.y-=(O.labelHeight-P)/2,O.setHeight(O.labelHeight),O.labelMarginTop=(O.labelHeight-P)/2):O.labelPosVertical=="bottom"&&O.setHeight(P+O.labelHeight))}})},I.prototype.repopulateCompounds=function(){for(var k=this.compoundOrder.length-1;k>=0;k--){var D=this.compoundOrder[k],R=D.id,O=D.paddingLeft,M=D.paddingTop,P=D.labelMarginLeft,B=D.labelMarginTop;this.adjustLocations(this.tiledMemberPack[R],D.rect.x,D.rect.y,O,M,P,B)}},I.prototype.repopulateZeroDegreeMembers=function(){var k=this,D=this.tiledZeroDegreePack;Object.keys(D).forEach(function(R){var O=k.idToDummyNode[R],M=O.paddingLeft,P=O.paddingTop,B=O.labelMarginLeft,F=O.labelMarginTop;k.adjustLocations(D[R],O.rect.x,O.rect.y,M,P,B,F)})},I.prototype.getToBeTiled=function(k){var D=k.id;if(this.toBeTiled[D]!=null)return this.toBeTiled[D];var R=k.getChild();if(R==null)return this.toBeTiled[D]=!1,!1;for(var O=R.getNodes(),M=0;M0)return this.toBeTiled[D]=!1,!1;if(P.getChild()==null){this.toBeTiled[P.id]=!1;continue}if(!this.getToBeTiled(P))return this.toBeTiled[D]=!1,!1}return this.toBeTiled[D]=!0,!0},I.prototype.getNodeDegree=function(k){for(var D=k.id,R=k.getEdges(),O=0,M=0;MU&&(U=te.rect.height)}R+=U+k.verticalPadding}},I.prototype.tileCompoundMembers=function(k,D){var R=this;this.tiledMemberPack=[],Object.keys(k).forEach(function(O){var M=D[O];if(R.tiledMemberPack[O]=R.tileNodes(k[O],M.paddingLeft+M.paddingRight),M.rect.width=R.tiledMemberPack[O].width,M.rect.height=R.tiledMemberPack[O].height,M.setCenter(R.tiledMemberPack[O].centerX,R.tiledMemberPack[O].centerY),M.labelMarginLeft=0,M.labelMarginTop=0,m.NODE_DIMENSIONS_INCLUDE_LABELS){var P=M.rect.width,B=M.rect.height;M.labelWidth&&(M.labelPosHorizontal=="left"?(M.rect.x-=M.labelWidth,M.setWidth(P+M.labelWidth),M.labelMarginLeft=M.labelWidth):M.labelPosHorizontal=="center"&&M.labelWidth>P?(M.rect.x-=(M.labelWidth-P)/2,M.setWidth(M.labelWidth),M.labelMarginLeft=(M.labelWidth-P)/2):M.labelPosHorizontal=="right"&&M.setWidth(P+M.labelWidth)),M.labelHeight&&(M.labelPosVertical=="top"?(M.rect.y-=M.labelHeight,M.setHeight(B+M.labelHeight),M.labelMarginTop=M.labelHeight):M.labelPosVertical=="center"&&M.labelHeight>B?(M.rect.y-=(M.labelHeight-B)/2,M.setHeight(M.labelHeight),M.labelMarginTop=(M.labelHeight-B)/2):M.labelPosVertical=="bottom"&&M.setHeight(B+M.labelHeight))}})},I.prototype.tileNodes=function(k,D){var R=this.tileNodesByFavoringDim(k,D,!0),O=this.tileNodesByFavoringDim(k,D,!1),M=this.getOrgRatio(R),P=this.getOrgRatio(O),B;return PF&&(F=he.getWidth())});var z=P/M,$=B/M,U=Math.pow(R-O,2)+4*(z+O)*($+R)*M,Q=(O-R+Math.sqrt(U))/(2*(z+O)),te;D?(te=Math.ceil(Q),te==Q&&te++):te=Math.floor(Q);var Y=te*(z+O)-O;return F>Y&&(Y=F),Y+=O*2,Y},I.prototype.tileNodesByFavoringDim=function(k,D,R){var O=m.TILING_PADDING_VERTICAL,M=m.TILING_PADDING_HORIZONTAL,P=m.TILING_COMPARE_BY,B={rows:[],rowWidth:[],rowHeight:[],width:0,height:D,verticalPadding:O,horizontalPadding:M,centerX:0,centerY:0};P&&(B.idealRowWidth=this.calcIdealRowWidth(k,R));var F=o(function(Z){return Z.rect.width*Z.rect.height},"getNodeArea"),z=o(function(Z,ue){return F(ue)-F(Z)},"areaCompareFcn");k.sort(function(he,Z){var ue=z;return B.idealRowWidth?(ue=P,ue(he.id,Z.id)):ue(he,Z)});for(var $=0,U=0,Q=0;Q0&&(B+=k.horizontalPadding),k.rowWidth[R]=B,k.width0&&(F+=k.verticalPadding);var z=0;F>k.rowHeight[R]&&(z=k.rowHeight[R],k.rowHeight[R]=F,z=k.rowHeight[R]-z),k.height+=z,k.rows[R].push(D)},I.prototype.getShortestRowIndex=function(k){for(var D=-1,R=Number.MAX_VALUE,O=0;OR&&(D=O,R=k.rowWidth[O]);return D},I.prototype.canAddHorizontal=function(k,D,R){if(k.idealRowWidth){var O=k.rows.length-1,M=k.rowWidth[O];return M+D+k.horizontalPadding<=k.idealRowWidth}var P=this.getShortestRowIndex(k);if(P<0)return!0;var B=k.rowWidth[P];if(B+k.horizontalPadding+D<=k.width)return!0;var F=0;k.rowHeight[P]0&&(F=R+k.verticalPadding-k.rowHeight[P]);var z;k.width-B>=D+k.horizontalPadding?z=(k.height+F)/(B+D+k.horizontalPadding):z=(k.height+F)/k.width,F=R+k.verticalPadding;var $;return k.widthP&&D!=R){O.splice(-1,1),k.rows[R].push(M),k.rowWidth[D]=k.rowWidth[D]-P,k.rowWidth[R]=k.rowWidth[R]+P,k.width=k.rowWidth[instance.getLongestRowIndex(k)];for(var B=Number.MIN_VALUE,F=0;FB&&(B=O[F].height);D>0&&(B+=k.verticalPadding);var z=k.rowHeight[D]+k.rowHeight[R];k.rowHeight[D]=B,k.rowHeight[R]0)for(var Y=M;Y<=P;Y++)te[0]+=this.grid[Y][B-1].length+this.grid[Y][B].length-1;if(P0)for(var Y=B;Y<=F;Y++)te[3]+=this.grid[M-1][Y].length+this.grid[M][Y].length-1;for(var he=T.MAX_VALUE,Z,ue,K=0;K{var u=l(551).FDLayoutNode,h=l(551).IMath;function f(p,m,g,y){u.call(this,p,m,g,y)}o(f,"CoSENode"),f.prototype=Object.create(u.prototype);for(var d in u)f[d]=u[d];f.prototype.calculateDisplacement=function(){var p=this.graphManager.getLayout();this.getChild()!=null&&this.fixedNodeWeight?(this.displacementX+=p.coolingFactor*(this.springForceX+this.repulsionForceX+this.gravitationForceX)/this.fixedNodeWeight,this.displacementY+=p.coolingFactor*(this.springForceY+this.repulsionForceY+this.gravitationForceY)/this.fixedNodeWeight):(this.displacementX+=p.coolingFactor*(this.springForceX+this.repulsionForceX+this.gravitationForceX)/this.noOfChildren,this.displacementY+=p.coolingFactor*(this.springForceY+this.repulsionForceY+this.gravitationForceY)/this.noOfChildren),Math.abs(this.displacementX)>p.coolingFactor*p.maxNodeDisplacement&&(this.displacementX=p.coolingFactor*p.maxNodeDisplacement*h.sign(this.displacementX)),Math.abs(this.displacementY)>p.coolingFactor*p.maxNodeDisplacement&&(this.displacementY=p.coolingFactor*p.maxNodeDisplacement*h.sign(this.displacementY)),this.child&&this.child.getNodes().length>0&&this.propogateDisplacementToChildren(this.displacementX,this.displacementY)},f.prototype.propogateDisplacementToChildren=function(p,m){for(var 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    Contributor Covenant Code of Conduct

    Our Pledge

    We as members, contributors, and leaders pledge to make participation in our community a harassment-free experience for everyone, regardless of age, body size, visible or invisible disability, ethnicity, sex characteristics, gender identity and expression, level of experience, education, socio-economic status, nationality, personal appearance, race, caste, color, religion, or sexual identity and orientation.

    We pledge to act and interact in ways that contribute to an open, welcoming, diverse, inclusive, and healthy community.

    Our Standards

    Examples of behavior that contributes to a positive environment for our community include:

    • Demonstrating empathy and kindness toward other people
    • Being respectful of differing opinions, viewpoints, and experiences
    • Giving and gracefully accepting constructive feedback
    • Accepting responsibility and apologizing to those affected by our mistakes, and learning from the experience
    • Focusing on what is best not just for us as individuals, but for the overall community

    Examples of unacceptable behavior include:

    • The use of sexualized language or imagery, and sexual attention or advances of any kind
    • Trolling, insulting or derogatory comments, and personal or political attacks
    • Public or private harassment
    • Publishing others' private information, such as a physical or email address, without their explicit permission
    • Other conduct which could reasonably be considered inappropriate in a professional setting

    Enforcement Responsibilities

    Community leaders are responsible for clarifying and enforcing our standards of acceptable behavior and will take appropriate and fair corrective action in response to any behavior that they deem inappropriate, threatening, offensive, or harmful.

    Community leaders have the right and responsibility to remove, edit, or reject comments, commits, code, wiki edits, issues, and other contributions that are not aligned to this Code of Conduct, and will communicate reasons for moderation decisions when appropriate.

    Scope

    This Code of Conduct applies within all community spaces, and also applies when an individual is officially representing the community in public spaces. Examples of representing our community include using an official email address, posting via an official social media account, or acting as an appointed representative at an online or offline event.

    Enforcement

    Instances of abusive, harassing, or otherwise unacceptable behavior may be reported to the community leaders responsible for enforcement at mail@nlohmann.me. All complaints will be reviewed and investigated promptly and fairly.

    All community leaders are obligated to respect the privacy and security of the reporter of any incident.

    Enforcement Guidelines

    Community leaders will follow these Community Impact Guidelines in determining the consequences for any action they deem in violation of this Code of Conduct:

    1. Correction

    Community Impact: Use of inappropriate language or other behavior deemed unprofessional or unwelcome in the community.

    Consequence: A private, written warning from community leaders, providing clarity around the nature of the violation and an explanation of why the behavior was inappropriate. A public apology may be requested.

    2. Warning

    Community Impact: A violation through a single incident or series of actions.

    Consequence: A warning with consequences for continued behavior. No interaction with the people involved, including unsolicited interaction with those enforcing the Code of Conduct, for a specified period of time. This includes avoiding interactions in community spaces as well as external channels like social media. Violating these terms may lead to a temporary or permanent ban.

    3. Temporary Ban

    Community Impact: A serious violation of community standards, including sustained inappropriate behavior.

    Consequence: A temporary ban from any sort of interaction or public communication with the community for a specified period of time. No public or private interaction with the people involved, including unsolicited interaction with those enforcing the Code of Conduct, is allowed during this period. Violating these terms may lead to a permanent ban.

    4. Permanent Ban

    Community Impact: Demonstrating a pattern of violation of community standards, including sustained inappropriate behavior, harassment of an individual, or aggression toward or disparagement of classes of individuals.

    Consequence: A permanent ban from any sort of public interaction within the community.

    Attribution

    This Code of Conduct is adapted from the Contributor Covenant, version 2.1, available at https://www.contributor-covenant.org/version/2/1/code_of_conduct.html.

    Community Impact Guidelines were inspired by Mozilla's code of conduct enforcement ladder.

    For answers to common questions about this code of conduct, see the FAQ at https://www.contributor-covenant.org/faq. Translations are available at https://www.contributor-covenant.org/translations.

    Copyright © 2013-2025 Niels Lohmann
    \ No newline at end of file +Code of Conduct - JSON for Modern C++

    Contributor Covenant Code of Conduct

    Our Pledge

    We as members, contributors, and leaders pledge to make participation in our community a harassment-free experience for everyone, regardless of age, body size, visible or invisible disability, ethnicity, sex characteristics, gender identity and expression, level of experience, education, socio-economic status, nationality, personal appearance, race, caste, color, religion, or sexual identity and orientation.

    We pledge to act and interact in ways that contribute to an open, welcoming, diverse, inclusive, and healthy community.

    Our Standards

    Examples of behavior that contributes to a positive environment for our community include:

    • Demonstrating empathy and kindness toward other people
    • Being respectful of differing opinions, viewpoints, and experiences
    • Giving and gracefully accepting constructive feedback
    • Accepting responsibility and apologizing to those affected by our mistakes, and learning from the experience
    • Focusing on what is best not just for us as individuals, but for the overall community

    Examples of unacceptable behavior include:

    • The use of sexualized language or imagery, and sexual attention or advances of any kind
    • Trolling, insulting or derogatory comments, and personal or political attacks
    • Public or private harassment
    • Publishing others' private information, such as a physical or email address, without their explicit permission
    • Other conduct which could reasonably be considered inappropriate in a professional setting

    Enforcement Responsibilities

    Community leaders are responsible for clarifying and enforcing our standards of acceptable behavior and will take appropriate and fair corrective action in response to any behavior that they deem inappropriate, threatening, offensive, or harmful.

    Community leaders have the right and responsibility to remove, edit, or reject comments, commits, code, wiki edits, issues, and other contributions that are not aligned to this Code of Conduct, and will communicate reasons for moderation decisions when appropriate.

    Scope

    This Code of Conduct applies within all community spaces, and also applies when an individual is officially representing the community in public spaces. Examples of representing our community include using an official email address, posting via an official social media account, or acting as an appointed representative at an online or offline event.

    Enforcement

    Instances of abusive, harassing, or otherwise unacceptable behavior may be reported to the community leaders responsible for enforcement at mail@nlohmann.me. All complaints will be reviewed and investigated promptly and fairly.

    All community leaders are obligated to respect the privacy and security of the reporter of any incident.

    Enforcement Guidelines

    Community leaders will follow these Community Impact Guidelines in determining the consequences for any action they deem in violation of this Code of Conduct:

    1. Correction

    Community Impact: Use of inappropriate language or other behavior deemed unprofessional or unwelcome in the community.

    Consequence: A private, written warning from community leaders, providing clarity around the nature of the violation and an explanation of why the behavior was inappropriate. A public apology may be requested.

    2. Warning

    Community Impact: A violation through a single incident or series of actions.

    Consequence: A warning with consequences for continued behavior. No interaction with the people involved, including unsolicited interaction with those enforcing the Code of Conduct, for a specified period of time. This includes avoiding interactions in community spaces as well as external channels like social media. Violating these terms may lead to a temporary or permanent ban.

    3. Temporary Ban

    Community Impact: A serious violation of community standards, including sustained inappropriate behavior.

    Consequence: A temporary ban from any sort of interaction or public communication with the community for a specified period of time. No public or private interaction with the people involved, including unsolicited interaction with those enforcing the Code of Conduct, is allowed during this period. Violating these terms may lead to a permanent ban.

    4. Permanent Ban

    Community Impact: Demonstrating a pattern of violation of community standards, including sustained inappropriate behavior, harassment of an individual, or aggression toward or disparagement of classes of individuals.

    Consequence: A permanent ban from any sort of public interaction within the community.

    Attribution

    This Code of Conduct is adapted from the Contributor Covenant, version 2.1, available at https://www.contributor-covenant.org/version/2/1/code_of_conduct.html.

    Community Impact Guidelines were inspired by Mozilla's code of conduct enforcement ladder.

    For answers to common questions about this code of conduct, see the FAQ at https://www.contributor-covenant.org/faq. Translations are available at https://www.contributor-covenant.org/translations.

    Copyright © 2013-2025 Niels Lohmann
    \ No newline at end of file diff --git a/community/contribution_guidelines/index.html b/community/contribution_guidelines/index.html index eee224a5e..16bc7d1ee 100644 --- a/community/contribution_guidelines/index.html +++ b/community/contribution_guidelines/index.html @@ -1,8 +1,8 @@ -Contribution Guidelines - JSON for Modern C++

    Contribution Guidelines

    Thank you for your interest in contributing to this project! What began as an exercise to explore the exciting features of C++11 has evolved into a widely used JSON library. I truly appreciate all the contributions from the community, whether it's proposing features, identifying bugs, or fixing mistakes! To ensure that our collaboration is efficient and effective, please follow these guidelines.

    Feel free to discuss or suggest improvements to this document by submitting a pull request.

    Ways to Contribute

    There are multiple ways to contribute.

    Reporting an issue

    Please create an issue, assuming one does not already exist, and describe your concern. Note you need a GitHub account for this.

    Clearly describe the issue:

    • If it is a bug, please describe how to reproduce it. If possible, attach a complete example which demonstrates the error. Please also state what you expected to happen instead of the error.
    • If you propose a change or addition, try to give an example what the improved code could look like or how to use it.
    • If you found a compilation error, please tell us which compiler (version and operating system) you used and paste the (relevant part of) the error messages to the ticket.

    Please stick to the provided issue template bug report if possible.

    Reporting a security vulnerability

    You can report a security vulnerability according to our security policy.

    Discussing a new feature

    For questions, feature or support requests, please open a discussion. If you find a proposed answer satisfactory, please use the "Mark as answer" button to make it easier for readers to see what helped and for the community to filter for open questions.

    Proposing a fix or an improvement

    Join an ongoing discussion or comment on an existing issue before starting to code. This can help to avoid duplicate efforts or other frustration during the later review.

    Create a pull request against the develop branch and follow the pull request template. In particular,

    • describe the changes in detail, both the what and why,
    • reference existing issues where applicable,
    • add tests to maintain 100% test coverage,
    • update the documentation as needed, and
    • ensure the source code is amalgamated.

    We describe all points in detail below.

    All contributions (including pull requests) must agree to the Developer Certificate of Origin (DCO) version 1.1. This is exactly the same one created and used by the Linux kernel developers and posted on http://developercertificate.org/. This is a developer's certification that he or she has the right to submit the patch for inclusion into the project.

    How to...

    Describe your changes

    This library is primarily maintained as a spare-time project. As such, I cannot make any guarantee how quickly changes are merged and released. Therefore, it is very important to make the review as smooth as possible by explaining not only what you changed, but why. This rationale can be very valuable down the road when improvements or bugs are discussed years later.

    Reference an existing issue

    Link a pull request to an issue to clarify that a fix is forthcoming and which issue can be closed after merging. Only a few cases (e.g., fixing typos) do not require prior discussions.

    Write tests

    The library has an extensive test suite that currently covers 100 % of the library's code. These tests are crucial to maintain API stability and give future contributors confidence that they do not accidentally break things. As Titus Winters aptly put it:

    If you liked it, you should have put a test on it.

    Run the tests

    First, ensure the test suite runs before making any changes:

    $ cmake -S. -B build
+ Contribution Guidelines - JSON for Modern C++      
     
     
      
     
      
     
     
     
     
      
     
     
     
     
     
      
     
     
     
     
           
    Contribution Guidelines
     
    Thank you for your interest in contributing to this project! What began as an exercise to explore the exciting features of C++11 has evolved into a widely used JSON library. I truly appreciate all the contributions from the community, whether it's proposing features, identifying bugs, or fixing mistakes! To ensure that our collaboration is efficient and effective, please follow these guidelines.
     
    Feel free to discuss or suggest improvements to this document by submitting a pull request.
     
    Ways to Contribute
     
    There are multiple ways to contribute.
     
    Reporting an issue
     
    Please create an issue, assuming one does not already exist, and describe your concern. Note you need a GitHub account for this.
     
    Clearly describe the issue:
     
       
    • If it is a bug, please describe how to reproduce it. If possible, attach a complete example which demonstrates the error. Please also state what you expected to happen instead of the error.
      •  
    • If you propose a change or addition, try to give an example what the improved code could look like or how to use it.
      •  
    • If you found a compilation error, please tell us which compiler (version and operating system) you used and paste the (relevant part of) the error messages to the ticket.
      •  
     
    Please stick to the provided issue template bug report if possible.
     
    Reporting a security vulnerability
     
    You can report a security vulnerability according to our security policy.
     
    Discussing a new feature
     
    For questions, feature or support requests, please open a discussion. If you find a proposed answer satisfactory, please use the "Mark as answer" button to make it easier for readers to see what helped and for the community to filter for open questions.
     
    Proposing a fix or an improvement
     
    Join an ongoing discussion or comment on an existing issue before starting to code. This can help to avoid duplicate efforts or other frustration during the later review.
     
    Create a pull request against the develop branch and follow the pull request template. In particular,
     
       
    • describe the changes in detail, both the what and why,
      •  
    • reference existing issues where applicable,
      •  
    • add tests to maintain 100% test coverage,
      •  
    • update the documentation as needed, and
      •  
    • ensure the source code is amalgamated.
      •  
     
    We describe all points in detail below.
     
    All contributions (including pull requests) must agree to the Developer Certificate of Origin (DCO) version 1.1. This is exactly the same one created and used by the Linux kernel developers and posted on http://developercertificate.org/. This is a developer's certification that he or she has the right to submit the patch for inclusion into the project.
     
    How to...
     
    Describe your changes
     
    This library is primarily maintained as a spare-time project. As such, I cannot make any guarantee how quickly changes are merged and released. Therefore, it is very important to make the review as smooth as possible by explaining not only what you changed, but why. This rationale can be very valuable down the road when improvements or bugs are discussed years later.
     
    Reference an existing issue
     
    Link a pull request to an issue to clarify that a fix is forthcoming and which issue can be closed after merging. Only a few cases (e.g., fixing typos) do not require prior discussions.
     
    Write tests
     
    The library has an extensive test suite that currently covers 100 % of the library's code. These tests are crucial to maintain API stability and give future contributors confidence that they do not accidentally break things. As Titus Winters aptly put it:
     
     
    If you liked it, you should have put a test on it.
     
     
    Run the tests
     
    First, ensure the test suite runs before making any changes:
     
    $ cmake -S. -B build
 $ cmake --build build -j 10
 $ ctest --test-dir build -j 10
 
     
    The test suite should report:
     
    100% tests passed, 0 tests failed out of 98
 
     
    Add tests
     
    The tests are located in tests/src/unit-*.cpp and contain doctest assertions like CHECK. The tests are structured along the features of the library or the nature of the tests. Usually, it should be clear from the context which existing file needs to be extended, and only very few cases require creating new test files.
     
    When fixing a bug, edit unit-regression2.cpp and add a section referencing the fixed issue.
     
    Exceptions
     
    When you test exceptions, please use CHECK_THROWS_WITH_AS which also takes the what() argument of the thrown exception into account.
     
    Coverage
     
    If test coverage decreases, an automatic warning comment will be posted on the pull request. You can access a code coverage report as an artifact to the “Ubuntu” workflow.
     
    Update the documentation
     
    The main documentation of the library is generated from the files docs/mkdocs/docs. This folder contains dedicated pages for certain features, a list of all exceptions, and extensive API documentation with details on every public API function.
     
    Build the documentation locally using:
     
    make install_venv -C docs/mkdocs
 make serve -C docs/mkdocs
 
     
    The documentation will then be available at http://127.0.0.1:8000/. See the documentation of mkdocs and Material for MkDocs for more information.
     
    Amalgamate the source code
     
    The single-header files single_include/nlohmann/json.hpp and single_include/nlohmann/json_fwd.hpp are generated from the source files in the include/nlohmann directory. Do not edit the files directly; instead, modify the include/nlohmann sources and regenerate the files by executing:
     
    make amalgamate
-
      
       
    • The library’s README file is an excellent starting point to understand its functionality.
      •  
    • The documentation page is the reference documentation of the library.
      •  
    • RFC 8259 is the reference for the JavaScript Object Notation (JSON) Data Interchange Format.
      •  
     
    Please don't...
     
    Certain contributions are not helpful.
     
    Break the public API
     
    We take pride in the library being used by numerous customers across various industries. They all rely on the guarantees provided by semantic versioning. Please do not change the library such that the public API of the 3.x.y version is broken. This includes:
     
       
    • Changing function signatures (altering parameter types, return types, number of parameters) or changing the const-ness of member functions.
      •  
    • Removing functions.
      •  
    • Renaming functions or classes.
      •  
    • Changing exception handling.
      •  
    • Changing exception ids.
      •  
    • Changing access specifiers.
      •  
    • Changing default arguments.
      •  
     
    Although these guidelines may seem restrictive, they are essential for maintaining the library’s utility.
     
    Breaking changes may be introduced when they are guarded with a feature macro such as JSON_USE_IMPLICIT_CONVERSIONS which allows selectively changing the behavior of the library. In next steps, the current behavior can then be deprecated. Using feature macros then allows users to test their code against the library in the next major release.
     
    Break C++11 language conformance
     
    This library is designed to work with C++11 and later. This means that any supported C++11 compiler should compile the library without problems. Some compilers like GCC 4.7 (and earlier), Clang 3.3 (and earlier), or Microsoft Visual Studio 13.0 and earlier are known not to work due to missing or incomplete C++11 support.
     
    Please do not add features that do not work with the mentioned supported compilers. Please guard features from C++14 and later against the respective JSON_HAS_CPP_14 macros.
     
    Break JSON conformance
     
    Please refrain from proposing changes that would break JSON conformance. If you propose a conformant extension of JSON to be supported by the library, please motivate this extension.
     
    Wanted
     
    The following areas really need contribution and are always welcomed:
     
       
    • Extending the continuous integration toward more exotic compilers such as Android NDK, Intel's Compiler, or the bleeding-edge versions Clang.
      •  
    • Improving the efficiency of the JSON parser. The current parser is implemented as a naive recursive descent parser with hand-coded string handling. More sophisticated approaches like LALR parsers would be really appreciated. That said, parser generators like Bison or ANTLR do not play nice with single-header files -- I really would like to keep the parser inside the json.hpp header, and I am not aware of approaches similar to re2c for parsing.
      •  
    • Extending and updating existing benchmarks to include (the most recent version of) this library. Though efficiency is not everything, speed and memory consumption are very important characteristics for C++ developers, so having proper comparisons would be interesting.
      •  
     
    We look forward to your contributions and collaboration to enhance the library!
       
     
       
      
     
     
     
     
     
     Copyright © 2013-2025 Niels Lohmann 
     
     
                 
     
     
     
     
     
     
     
         
\ No newline at end of file
+
    • The library’s README file is an excellent starting point to understand its functionality.
    • The documentation page is the reference documentation of the library.
    • RFC 8259 is the reference for the JavaScript Object Notation (JSON) Data Interchange Format.

    Please don't...

    Certain contributions are not helpful.

    Break the public API

    We take pride in the library being used by numerous customers across various industries. They all rely on the guarantees provided by semantic versioning. Please do not change the library such that the public API of the 3.x.y version is broken. This includes:

    • Changing function signatures (altering parameter types, return types, number of parameters) or changing the const-ness of member functions.
    • Removing functions.
    • Renaming functions or classes.
    • Changing exception handling.
    • Changing exception ids.
    • Changing access specifiers.
    • Changing default arguments.

    Although these guidelines may seem restrictive, they are essential for maintaining the library’s utility.

    Breaking changes may be introduced when they are guarded with a feature macro such as JSON_USE_IMPLICIT_CONVERSIONS which allows selectively changing the behavior of the library. In next steps, the current behavior can then be deprecated. Using feature macros then allows users to test their code against the library in the next major release.

    Break C++11 language conformance

    This library is designed to work with C++11 and later. This means that any supported C++11 compiler should compile the library without problems. Some compilers like GCC 4.7 (and earlier), Clang 3.3 (and earlier), or Microsoft Visual Studio 13.0 and earlier are known not to work due to missing or incomplete C++11 support.

    Please do not add features that do not work with the mentioned supported compilers. Please guard features from C++14 and later against the respective JSON_HAS_CPP_14 macros.

    Break JSON conformance

    Please refrain from proposing changes that would break JSON conformance. If you propose a conformant extension of JSON to be supported by the library, please motivate this extension.

    Wanted

    The following areas really need contribution and are always welcomed:

    • Extending the continuous integration toward more exotic compilers such as Android NDK, Intel's Compiler, or the bleeding-edge versions Clang.
    • Improving the efficiency of the JSON parser. The current parser is implemented as a naive recursive descent parser with hand-coded string handling. More sophisticated approaches like LALR parsers would be really appreciated. That said, parser generators like Bison or ANTLR do not play nice with single-header files -- I really would like to keep the parser inside the json.hpp header, and I am not aware of approaches similar to re2c for parsing.
    • Extending and updating existing benchmarks to include (the most recent version of) this library. Though efficiency is not everything, speed and memory consumption are very important characteristics for C++ developers, so having proper comparisons would be interesting.

    We look forward to your contributions and collaboration to enhance the library!

    Copyright © 2013-2025 Niels Lohmann
    \ No newline at end of file diff --git a/community/governance/index.html b/community/governance/index.html index 6a3aea665..9e22a2808 100644 --- a/community/governance/index.html +++ b/community/governance/index.html @@ -1 +1 @@ -Governance - JSON for Modern C++

    Governance

    The governance model for the JSON for Modern C++ project is a Benevolent Dictator for Life (BDFL) structure. As the sole maintainer, Niels Lohmann is responsible for all key aspects of the project. The project governance may evolve as the project grows, but any changes will be documented here and communicated to contributors.

    Overview

    This project is led by a benevolent dictator, Niels Lohmann, and managed by the community. That is, the community actively contributes to the day-to-day maintenance of the project, but the general strategic line is drawn by the benevolent dictator. In case of disagreement, they have the last word. It is the benevolent dictator’s job to resolve disputes within the community and to ensure that the project is able to progress in a coordinated way. In turn, it is the community’s job to guide the decisions of the benevolent dictator through active engagement and contribution.

    Roles and responsibilities

    Benevolent dictator (project lead)

    Typically, the benevolent dictator, or project lead, is self-appointed. However, because the community always has the ability to fork, this person is fully answerable to the community. The project lead’s role is a difficult one: they set the strategic objectives of the project and communicate these clearly to the community. They also have to understand the community as a whole and strive to satisfy as many conflicting needs as possible, while ensuring that the project survives in the long term.

    In many ways, the role of the benevolent dictator is less about dictatorship and more about diplomacy. The key is to ensure that, as the project expands, the right people are given influence over it and the community rallies behind the vision of the project lead. The lead’s job is then to ensure that the committers (see below) make the right decisions on behalf of the project. Generally speaking, as long as the committers are aligned with the project’s strategy, the project lead will allow them to proceed as they desire.

    Committers

    Committers are contributors who have made several valuable contributions to the project and are now relied upon to both write code directly to the repository and screen the contributions of others. In many cases they are programmers but it is also possible that they contribute in a different role. Typically, a committer will focus on a specific aspect of the project, and will bring a level of expertise and understanding that earns them the respect of the community and the project lead. The role of committer is not an official one, it is simply a position that influential members of the community will find themselves in as the project lead looks to them for guidance and support.

    Committers have no authority over the overall direction of the project. However, they do have the ear of the project lead. It is a committer’s job to ensure that the lead is aware of the community’s needs and collective objectives, and to help develop or elicit appropriate contributions to the project. Often, committers are given informal control over their specific areas of responsibility, and are assigned rights to directly modify certain areas of the source code. That is, although committers do not have explicit decision-making authority, they will often find that their actions are synonymous with the decisions made by the lead.

    Contributors

    Contributors are community members who either have no desire to become committers, or have not yet been given the opportunity by the benevolent dictator. They make valuable contributions, such as those outlined in the list below, but generally do not have the authority to make direct changes to the project code. Contributors engage with the project through communication tools, such as email lists, and via reports and patches attached to issues in the issue tracker, as detailed in our community tools document.

    Anyone can become a contributor. There is no expectation of commitment to the project, no specific skill requirements and no selection process. To become a contributor, a community member simply has to perform one or more actions that are beneficial to the project.

    Some contributors will already be engaging with the project as users, but will also find themselves doing one or more of the following:

    • supporting new users (current users often provide the most effective new user support)
    • reporting bugs
    • identifying requirements
    • supplying graphics and web design
    • programming
    • assisting with project infrastructure
    • writing documentation
    • fixing bugs
    • adding features

    As contributors gain experience and familiarity with the project, they may find that the project lead starts relying on them more and more. When this begins to happen, they gradually adopt the role of committer, as described above.

    Users

    Users are community members who have a need for the project. They are the most important members of the community: without them, the project would have no purpose. Anyone can be a user; there are no specific requirements.

    Users should be encouraged to participate in the life of the project and the community as much as possible. User contributions enable the project team to ensure that they are satisfying the needs of those users. Common user activities include (but are not limited to):

    • evangelising about the project
    • informing developers of project strengths and weaknesses from a new user’s perspective
    • providing moral support (a ‘thank you’ goes a long way)
    • providing financial support

    Users who continue to engage with the project and its community will often find themselves becoming more and more involved. Such users may then go on to become contributors, as described above.

    Support

    All participants in the community are encouraged to provide support for new users within the project management infrastructure. This support is provided as a way of growing the community. Those seeking support should recognise that all support activity within the project is voluntary and is therefore provided as and when time allows. A user requiring guaranteed response times or results should therefore seek to purchase a support contract from a vendor. (Of course, that vendor should be an active member of the community.) However, for those willing to engage with the project on its own terms, and willing to help support other users, the community support channels are ideal.

    Contribution Process

    Anyone can contribute to the project, regardless of their skills, as there are many ways to contribute. For instance, a contributor might be active on the project mailing list and issue tracker, or might supply patches. The various ways of contributing are described in more detail in our roles in open source document.

    The developer mailing list is the most appropriate place for a contributor to ask for help when making their first contribution.

    Decision-Making Process

    The benevolent dictatorship model does not need a formal conflict resolution process, since the project lead’s word is final. If the community chooses to question the wisdom of the actions of a committer, the project lead can review their decisions by checking the email archives, and either uphold or reverse them.

    Source

    The text was taken from http://oss-watch.ac.uk/resources/benevolentdictatorgovernancemodel.

    Copyright © 2013-2025 Niels Lohmann
    \ No newline at end of file +Governance - JSON for Modern C++

    Governance

    The governance model for the JSON for Modern C++ project is a Benevolent Dictator for Life (BDFL) structure. As the sole maintainer, Niels Lohmann is responsible for all key aspects of the project. The project governance may evolve as the project grows, but any changes will be documented here and communicated to contributors.

    Overview

    This project is led by a benevolent dictator, Niels Lohmann, and managed by the community. That is, the community actively contributes to the day-to-day maintenance of the project, but the general strategic line is drawn by the benevolent dictator. In case of disagreement, they have the last word. It is the benevolent dictator’s job to resolve disputes within the community and to ensure that the project is able to progress in a coordinated way. In turn, it is the community’s job to guide the decisions of the benevolent dictator through active engagement and contribution.

    Roles and responsibilities

    Benevolent dictator (project lead)

    Typically, the benevolent dictator, or project lead, is self-appointed. However, because the community always has the ability to fork, this person is fully answerable to the community. The project lead’s role is a difficult one: they set the strategic objectives of the project and communicate these clearly to the community. They also have to understand the community as a whole and strive to satisfy as many conflicting needs as possible, while ensuring that the project survives in the long term.

    In many ways, the role of the benevolent dictator is less about dictatorship and more about diplomacy. The key is to ensure that, as the project expands, the right people are given influence over it and the community rallies behind the vision of the project lead. The lead’s job is then to ensure that the committers (see below) make the right decisions on behalf of the project. Generally speaking, as long as the committers are aligned with the project’s strategy, the project lead will allow them to proceed as they desire.

    Committers

    Committers are contributors who have made several valuable contributions to the project and are now relied upon to both write code directly to the repository and screen the contributions of others. In many cases they are programmers but it is also possible that they contribute in a different role. Typically, a committer will focus on a specific aspect of the project, and will bring a level of expertise and understanding that earns them the respect of the community and the project lead. The role of committer is not an official one, it is simply a position that influential members of the community will find themselves in as the project lead looks to them for guidance and support.

    Committers have no authority over the overall direction of the project. However, they do have the ear of the project lead. It is a committer’s job to ensure that the lead is aware of the community’s needs and collective objectives, and to help develop or elicit appropriate contributions to the project. Often, committers are given informal control over their specific areas of responsibility, and are assigned rights to directly modify certain areas of the source code. That is, although committers do not have explicit decision-making authority, they will often find that their actions are synonymous with the decisions made by the lead.

    Contributors

    Contributors are community members who either have no desire to become committers, or have not yet been given the opportunity by the benevolent dictator. They make valuable contributions, such as those outlined in the list below, but generally do not have the authority to make direct changes to the project code. Contributors engage with the project through communication tools, such as email lists, and via reports and patches attached to issues in the issue tracker, as detailed in our community tools document.

    Anyone can become a contributor. There is no expectation of commitment to the project, no specific skill requirements and no selection process. To become a contributor, a community member simply has to perform one or more actions that are beneficial to the project.

    Some contributors will already be engaging with the project as users, but will also find themselves doing one or more of the following:

    • supporting new users (current users often provide the most effective new user support)
    • reporting bugs
    • identifying requirements
    • supplying graphics and web design
    • programming
    • assisting with project infrastructure
    • writing documentation
    • fixing bugs
    • adding features

    As contributors gain experience and familiarity with the project, they may find that the project lead starts relying on them more and more. When this begins to happen, they gradually adopt the role of committer, as described above.

    Users

    Users are community members who have a need for the project. They are the most important members of the community: without them, the project would have no purpose. Anyone can be a user; there are no specific requirements.

    Users should be encouraged to participate in the life of the project and the community as much as possible. User contributions enable the project team to ensure that they are satisfying the needs of those users. Common user activities include (but are not limited to):

    • evangelising about the project
    • informing developers of project strengths and weaknesses from a new user’s perspective
    • providing moral support (a ‘thank you’ goes a long way)
    • providing financial support

    Users who continue to engage with the project and its community will often find themselves becoming more and more involved. Such users may then go on to become contributors, as described above.

    Support

    All participants in the community are encouraged to provide support for new users within the project management infrastructure. This support is provided as a way of growing the community. Those seeking support should recognise that all support activity within the project is voluntary and is therefore provided as and when time allows. A user requiring guaranteed response times or results should therefore seek to purchase a support contract from a vendor. (Of course, that vendor should be an active member of the community.) However, for those willing to engage with the project on its own terms, and willing to help support other users, the community support channels are ideal.

    Contribution Process

    Anyone can contribute to the project, regardless of their skills, as there are many ways to contribute. For instance, a contributor might be active on the project mailing list and issue tracker, or might supply patches. The various ways of contributing are described in more detail in our roles in open source document.

    The developer mailing list is the most appropriate place for a contributor to ask for help when making their first contribution.

    Decision-Making Process

    The benevolent dictatorship model does not need a formal conflict resolution process, since the project lead’s word is final. If the community chooses to question the wisdom of the actions of a committer, the project lead can review their decisions by checking the email archives, and either uphold or reverse them.

    Source

    The text was taken from http://oss-watch.ac.uk/resources/benevolentdictatorgovernancemodel.

    Copyright © 2013-2025 Niels Lohmann
    \ No newline at end of file diff --git a/community/index.html b/community/index.html index b069728b0..f25f02480 100644 --- a/community/index.html +++ b/community/index.html @@ -1 +1 @@ -Community - JSON for Modern C++
    Copyright © 2013-2025 Niels Lohmann
    \ No newline at end of file +Community - JSON for Modern C++
    Copyright © 2013-2025 Niels Lohmann
    \ No newline at end of file diff --git a/community/quality_assurance/index.html b/community/quality_assurance/index.html index c0f96802c..01c3ab004 100644 --- a/community/quality_assurance/index.html +++ b/community/quality_assurance/index.html @@ -1,4 +1,4 @@ -Quality assurance - JSON for Modern C++

    Quality assurance

    Ensuring quality is paramount for this project, particularly because numerous other projects depend on it. Each commit to the library undergoes rigorous checks against the following requirements, and any violations will result in a failed build.

    C++ language compliance and compiler compatibility

    Requirement: Compiler support

    Any compiler with complete C++11 support can compile the library without warnings.

    • The library is compiled with 50+ different C++ compilers with different operating systems and platforms, including the oldest versions known to compile the library.

      Compilers used in continuous integration
    Compiler Architecture Operating System CI
    AppleClang 14.0.0.14000029; Xcode 14.1 x86_64 macOS 13.7.2 (Ventura) GitHub
    AppleClang 14.0.0.14000029; Xcode 14.2 x86_64 macOS 13.7.2 (Ventura) GitHub
    AppleClang 14.0.3.14030022; Xcode 14.3.1 x86_64 macOS 13.7.2 (Ventura) GitHub
    AppleClang 15.0.0.15000040; Xcode 15.0.1 x86_64 macOS 13.7.2 (Ventura) GitHub
    AppleClang 15.0.0.15000100; Xcode 15.1 x86_64 macOS 13.7.2 (Ventura) GitHub
    AppleClang 15.0.0.15000100; Xcode 15.2 x86_64 macOS 13.7.2 (Ventura) GitHub
    AppleClang 15.0.0.15000309; Xcode 15.3 arm64 macOS 14.7.2 (Sonoma) GitHub
    AppleClang 15.0.0.15000309; Xcode 15.4 arm64 macOS 14.7.2 (Sonoma) GitHub
    AppleClang 16.0.0.16000026; Xcode 16 arm64 macOS 15.2 (Sequoia) GitHub
    AppleClang 16.0.0.16000026; Xcode 16.1 arm64 macOS 15.2 (Sequoia) GitHub
    AppleClang 16.0.0.16000026; Xcode 16.2 arm64 macOS 15.2 (Sequoia) GitHub
    AppleClang 17.0.0.17000013; Xcode 16.3 arm64 macOS 15.5 (Sequoia) GitHub
    Clang 3.5.2 x86_64 Ubuntu 22.04.1 LTS GitHub
    Clang 3.6.2 x86_64 Ubuntu 22.04.1 LTS GitHub
    Clang 3.7.1 x86_64 Ubuntu 22.04.1 LTS GitHub
    Clang 3.8.1 x86_64 Ubuntu 22.04.1 LTS GitHub
    Clang 3.9.1 x86_64 Ubuntu 22.04.1 LTS GitHub
    Clang 4.0.1 x86_64 Ubuntu 22.04.1 LTS GitHub
    Clang 5.0.2 x86_64 Ubuntu 22.04.1 LTS GitHub
    Clang 6.0.1 x86_64 Ubuntu 22.04.1 LTS GitHub
    Clang 7.1.0 x86_64 Ubuntu 22.04.1 LTS GitHub
    Clang 8.0.1 x86_64 Ubuntu 22.04.1 LTS GitHub
    Clang 9.0.1 x86_64 Ubuntu 22.04.1 LTS GitHub
    Clang 10.0.1 x86_64 Ubuntu 22.04.1 LTS GitHub
    Clang 11.0.0 with GNU-like command-line x86_64 Windows 10 (Build 17763) GitHub
    Clang 11.1.0 x86_64 Ubuntu 22.04.1 LTS GitHub
    Clang 12.0.0 with GNU-like command-line x86_64 Windows 10 (Build 17763) GitHub
    Clang 12.0.0 with MSVC-like command-line x86_64 Windows 10 (Build 17763) GitHub
    Clang 12.0.1 x86_64 Ubuntu 22.04.1 LTS GitHub
    Clang 13.0.0 with GNU-like command-line x86_64 Windows 10 (Build 17763) GitHub
    Clang 13.0.1 x86_64 Ubuntu 22.04.1 LTS GitHub
    Clang 14.0.0 with GNU-like command-line x86_64 Windows 10 (Build 17763) GitHub
    Clang 14.0.6 x86_64 Ubuntu 22.04.1 LTS GitHub
    Clang 15.0.0 with GNU-like command-line x86_64 Windows 10 (Build 17763) GitHub
    Clang 15.0.7 x86_64 Ubuntu 22.04.1 LTS GitHub
    Clang 16.0.6 x86_64 Ubuntu 22.04.1 LTS GitHub
    Clang 17.0.6 x86_64 Ubuntu 22.04.1 LTS GitHub
    Clang 18.1.8 x86_64 Ubuntu 22.04.1 LTS GitHub
    Clang 19.1.7 x86_64 Ubuntu 22.04.1 LTS GitHub
    Clang 20.1.1 x86_64 Ubuntu 22.04.1 LTS GitHub
    Clang 21.0.0 x86_64 Ubuntu 22.04.1 LTS GitHub
    Emscripten 4.0.6 x86_64 Ubuntu 22.04.1 LTS GitHub
    GNU 4.8.5 x86_64 Ubuntu 22.04.1 LTS GitHub
    GNU 4.9.3 x86_64 Ubuntu 22.04.1 LTS GitHub
    GNU 5.5.0 x86_64 Ubuntu 22.04.1 LTS GitHub
    GNU 6.4.0 x86_64 Ubuntu 22.04.1 LTS GitHub
    GNU 7.5.0 x86_64 Ubuntu 22.04.1 LTS GitHub
    GNU 8.5.0 x86_64 Ubuntu 22.04.1 LTS GitHub
    GNU 9.3.0 x86_64 Ubuntu 22.04.1 LTS GitHub
    GNU 9.4.0 x86_64 Ubuntu 22.04.1 LTS GitHub
    GNU 9.5.0 x86_64 Ubuntu 22.04.1 LTS GitHub
    GNU 10.5.0 x86_64 Ubuntu 22.04.1 LTS GitHub
    GNU 11.4.0 x86_64 Ubuntu 22.04.1 LTS GitHub
    GNU 11.5.0 x86_64 Ubuntu 22.04.1 LTS GitHub
    GNU 12.2.0 (MinGW-W64 i686-ucrt-posix-dwarf) x86_64 Windows 10 (Build 17763) GitHub
    GNU 12.2.0 (MinGW-W64 x86_64-ucrt-posix-seh) x86_64 Windows 10 (Build 17763) GitHub
    GNU 12.4.0 x86_64 Ubuntu 22.04.1 LTS GitHub
    GNU 13.3.0 x86_64 Ubuntu 22.04.1 LTS GitHub
    GNU 14.2.0 x86_64 Ubuntu 22.04.1 LTS GitHub
    GNU 14.2.0 arm64 Linux 6.1.100 Cirrus CI
    GNU 15.1.0 x86_64 Ubuntu 22.04.1 LTS GitHub
    icpc (ICC) 2021.5.0 20211109 x86_64 Ubuntu 20.04.3 LTS GitHub
    MSVC 19.0.24241.7 x86 Windows 8.1 AppVeyor
    MSVC 19.16.27035.0 x86 Windows-10 (Build 14393) AppVeyor
    MSVC 19.29.30157.0 x86 Windows 10 (Build 17763) GitHub
    MSVC 19.29.30157.0 x86_64 Windows 10 (Build 17763) GitHub
    MSVC 19.29.30157.0 x86 Windows-10 (Build 17763) AppVeyor
    MSVC 19.42.34435.0 x86 Windows 10 (Build 20348) GitHub
    MSVC 19.42.34435.0 x86_64 Windows 10 (Build 20348) GitHub

  • The library is compiled with all C++ language revisions (C++11, C++14, C++17, C++20, C++23, and C++26) to detect and fix language deprecations early.

  • The library is checked for compiler warnings:

  • On Clang, -Weverything is used with 7 exceptions.

    Clang warnings 
    # Ignored Clang warnings:
+ Quality assurance - JSON for Modern C++      
     
     
      
     
      
     
     
     
     
      
     
     
     
     
     
      
     
     
     
     
           
    Quality assurance
     
    Ensuring quality is paramount for this project, particularly because numerous other projects depend on it. Each commit to the library undergoes rigorous checks against the following requirements, and any violations will result in a failed build.
     
    C++ language compliance and compiler compatibility
     
     
    Requirement: Compiler support
     
    Any compiler with complete C++11 support can compile the library without warnings.
     
     
       
    •  
       The library is compiled with 50+ different C++ compilers with different operating systems and platforms, including the oldest versions known to compile the library.
       
       Compilers used in continuous integration 
        
       Compiler Architecture Operating System CI 
               
       AppleClang 14.0.0.14000029; Xcode 14.1 x86_64 macOS 13.7.2 (Ventura) GitHub 
       
       AppleClang 14.0.0.14000029; Xcode 14.2 x86_64 macOS 13.7.2 (Ventura) GitHub 
       
       AppleClang 14.0.3.14030022; Xcode 14.3.1 x86_64 macOS 13.7.2 (Ventura) GitHub 
       
       AppleClang 15.0.0.15000040; Xcode 15.0.1 x86_64 macOS 13.7.2 (Ventura) GitHub 
       
       AppleClang 15.0.0.15000100; Xcode 15.1 x86_64 macOS 13.7.2 (Ventura) GitHub 
       
       AppleClang 15.0.0.15000100; Xcode 15.2 x86_64 macOS 13.7.2 (Ventura) GitHub 
       
       AppleClang 15.0.0.15000309; Xcode 15.3 arm64 macOS 14.7.2 (Sonoma) GitHub 
       
       AppleClang 15.0.0.15000309; Xcode 15.4 arm64 macOS 14.7.2 (Sonoma) GitHub 
       
       AppleClang 16.0.0.16000026; Xcode 16 arm64 macOS 15.2 (Sequoia) GitHub 
       
       AppleClang 16.0.0.16000026; Xcode 16.1 arm64 macOS 15.2 (Sequoia) GitHub 
       
       AppleClang 16.0.0.16000026; Xcode 16.2 arm64 macOS 15.2 (Sequoia) GitHub 
       
       AppleClang 17.0.0.17000013; Xcode 16.3 arm64 macOS 15.5 (Sequoia) GitHub 
       
       Clang 3.5.2 x86_64 Ubuntu 22.04.1 LTS GitHub 
       
       Clang 3.6.2 x86_64 Ubuntu 22.04.1 LTS GitHub 
       
       Clang 3.7.1 x86_64 Ubuntu 22.04.1 LTS GitHub 
       
       Clang 3.8.1 x86_64 Ubuntu 22.04.1 LTS GitHub 
       
       Clang 3.9.1 x86_64 Ubuntu 22.04.1 LTS GitHub 
       
       Clang 4.0.1 x86_64 Ubuntu 22.04.1 LTS GitHub 
       
       Clang 5.0.2 x86_64 Ubuntu 22.04.1 LTS GitHub 
       
       Clang 6.0.1 x86_64 Ubuntu 22.04.1 LTS GitHub 
       
       Clang 7.1.0 x86_64 Ubuntu 22.04.1 LTS GitHub 
       
       Clang 8.0.1 x86_64 Ubuntu 22.04.1 LTS GitHub 
       
       Clang 9.0.1 x86_64 Ubuntu 22.04.1 LTS GitHub 
       
       Clang 10.0.1 x86_64 Ubuntu 22.04.1 LTS GitHub 
       
       Clang 11.0.0 with GNU-like command-line x86_64 Windows 10 (Build 17763) GitHub 
       
       Clang 11.1.0 x86_64 Ubuntu 22.04.1 LTS GitHub 
       
       Clang 12.0.0 with GNU-like command-line x86_64 Windows 10 (Build 17763) GitHub 
       
       Clang 12.0.0 with MSVC-like command-line x86_64 Windows 10 (Build 17763) GitHub 
       
       Clang 12.0.1 x86_64 Ubuntu 22.04.1 LTS GitHub 
       
       Clang 13.0.0 with GNU-like command-line x86_64 Windows 10 (Build 17763) GitHub 
       
       Clang 13.0.1 x86_64 Ubuntu 22.04.1 LTS GitHub 
       
       Clang 14.0.0 with GNU-like command-line x86_64 Windows 10 (Build 17763) GitHub 
       
       Clang 14.0.6 x86_64 Ubuntu 22.04.1 LTS GitHub 
       
       Clang 15.0.0 with GNU-like command-line x86_64 Windows 10 (Build 17763) GitHub 
       
       Clang 15.0.7 x86_64 Ubuntu 22.04.1 LTS GitHub 
       
       Clang 16.0.6 x86_64 Ubuntu 22.04.1 LTS GitHub 
       
       Clang 17.0.6 x86_64 Ubuntu 22.04.1 LTS GitHub 
       
       Clang 18.1.8 x86_64 Ubuntu 22.04.1 LTS GitHub 
       
       Clang 19.1.7 x86_64 Ubuntu 22.04.1 LTS GitHub 
       
       Clang 20.1.1 x86_64 Ubuntu 22.04.1 LTS GitHub 
       
       Clang 21.0.0 x86_64 Ubuntu 22.04.1 LTS GitHub 
       
       Emscripten 4.0.6 x86_64 Ubuntu 22.04.1 LTS GitHub 
       
       GNU 4.8.5 x86_64 Ubuntu 22.04.1 LTS GitHub 
       
       GNU 4.9.3 x86_64 Ubuntu 22.04.1 LTS GitHub 
       
       GNU 5.5.0 x86_64 Ubuntu 22.04.1 LTS GitHub 
       
       GNU 6.4.0 x86_64 Ubuntu 22.04.1 LTS GitHub 
       
       GNU 7.5.0 x86_64 Ubuntu 22.04.1 LTS GitHub 
       
       GNU 8.5.0 x86_64 Ubuntu 22.04.1 LTS GitHub 
       
       GNU 9.3.0 x86_64 Ubuntu 22.04.1 LTS GitHub 
       
       GNU 9.4.0 x86_64 Ubuntu 22.04.1 LTS GitHub 
       
       GNU 9.5.0 x86_64 Ubuntu 22.04.1 LTS GitHub 
       
       GNU 10.5.0 x86_64 Ubuntu 22.04.1 LTS GitHub 
       
       GNU 11.4.0 x86_64 Ubuntu 22.04.1 LTS GitHub 
       
       GNU 11.5.0 x86_64 Ubuntu 22.04.1 LTS GitHub 
       
       GNU 12.2.0 (MinGW-W64 i686-ucrt-posix-dwarf) x86_64 Windows 10 (Build 17763) GitHub 
       
       GNU 12.2.0 (MinGW-W64 x86_64-ucrt-posix-seh) x86_64 Windows 10 (Build 17763) GitHub 
       
       GNU 12.4.0 x86_64 Ubuntu 22.04.1 LTS GitHub 
       
       GNU 13.3.0 x86_64 Ubuntu 22.04.1 LTS GitHub 
       
       GNU 14.2.0 x86_64 Ubuntu 22.04.1 LTS GitHub 
       
       GNU 14.2.0 arm64 Linux 6.1.100 Cirrus CI 
       
       GNU 15.1.0 x86_64 Ubuntu 22.04.1 LTS GitHub 
       
       icpc (ICC) 2021.5.0 20211109 x86_64 Ubuntu 20.04.3 LTS GitHub 
       
       MSVC 19.0.24241.7 x86 Windows 8.1 AppVeyor 
       
       MSVC 19.16.27035.0 x86 Windows-10 (Build 14393) AppVeyor 
       
       MSVC 19.29.30157.0 x86 Windows 10 (Build 17763) GitHub 
       
       MSVC 19.29.30157.0 x86_64 Windows 10 (Build 17763) GitHub 
       
       MSVC 19.29.30157.0 x86 Windows-10 (Build 17763) AppVeyor 
       
       MSVC 19.42.34435.0 x86 Windows 10 (Build 20348) GitHub 
       
       MSVC 19.42.34435.0 x86_64 Windows 10 (Build 20348) GitHub 
              
       
       
      •  
    •  
       The library is compiled with all C++ language revisions (C++11, C++14, C++17, C++20, C++23, and C++26) to detect and fix language deprecations early.
       
      •  
    •  The library is checked for compiler warnings:
      •  
    •  
      On Clang, -Weverything is used with 7 exceptions.
       
       Clang warnings 
      # Ignored Clang warnings:
 # -Wno-c++98-compat               The library targets C++11.
 # -Wno-c++98-compat-pedantic      The library targets C++11.
 # -Wno-deprecated-declarations    The library contains annotations for deprecated functions.
@@ -540,4 +540,4 @@
 
 # for the linux (LF) line end style
 --lineend=linux
-
       
       
      •  
    •  
       The code style is checked with cpplint with 61 enabled rules.
       
      •  
     
    Simple integration
     
     
    Requirement: Single header
     
    The library can be used by adding a single header to a C++ project.
     
     
       
    •  An amalgamation script is used to check if the source code is exposed as a self-contained single-header file.
      •  
    •  The test suite is checked against the amalgamated source file as well as the individual source file.
      •  
     
     
    Requirement: CMake as primary development tool
     
    All library functions are exposed and usable by CMake.
     
     
       
    •  All library options are exposed as CMake options and tested.
      •  
    •  The library is tested against relevant CMake versions:
      •  
    • CMake 3.5 (the earliest supported)
      •  
    • CMake 3.31.6 (the latest 3.x release)
      •  
    • CMake 4.0.0 (a very recent release)
      •  
       
     
       
      
     
     
     
     
     
     Copyright © 2013-2025 Niels Lohmann 
     
     
                 
     
     
     
     
     
     
     
         
\ No newline at end of file
+

  • The code style is checked with cpplint with 61 enabled rules.

    • Simple integration

    Requirement: Single header

    The library can be used by adding a single header to a C++ project.

    • An amalgamation script is used to check if the source code is exposed as a self-contained single-header file.
    • The test suite is checked against the amalgamated source file as well as the individual source file.

    Requirement: CMake as primary development tool

    All library functions are exposed and usable by CMake.

    • All library options are exposed as CMake options and tested.
    • The library is tested against relevant CMake versions:
    • CMake 3.5 (the earliest supported)
    • CMake 3.31.6 (the latest 3.x release)
    • CMake 4.0.0 (a very recent release)
    Copyright © 2013-2025 Niels Lohmann
    \ No newline at end of file diff --git a/community/security_policy/index.html b/community/security_policy/index.html index cabe2cb85..d8de781cc 100644 --- a/community/security_policy/index.html +++ b/community/security_policy/index.html @@ -1 +1 @@ - Security Policy - JSON for Modern C++

    Security Policy

    Reporting a Vulnerability

    We value the security of our users and appreciate your efforts to responsibly disclose vulnerabilities. If you have identified a security vulnerability in this repository, please use the GitHub Security Advisory "Report a Vulnerability" tab.

    Until it is published, this draft security advisory will only be visible to the maintainers of this project. Other users and teams may be added once the advisory is created.

    We will send a response indicating the next steps in handling your report. After the initial reply to your report, we will keep you informed of the progress towards a fix and full announcement and may ask for additional information or guidance.

    For vulnerabilities in third-party dependencies or modules, please report them directly to the respective maintainers.

    Additional Resources

    We sincerely thank you for contributing to the security and integrity of this project!

    Copyright © 2013-2025 Niels Lohmann
    \ No newline at end of file + Security Policy - JSON for Modern C++

    Security Policy

    Reporting a Vulnerability

    We value the security of our users and appreciate your efforts to responsibly disclose vulnerabilities. If you have identified a security vulnerability in this repository, please use the GitHub Security Advisory "Report a Vulnerability" tab.

    Until it is published, this draft security advisory will only be visible to the maintainers of this project. Other users and teams may be added once the advisory is created.

    We will send a response indicating the next steps in handling your report. After the initial reply to your report, we will keep you informed of the progress towards a fix and full announcement and may ask for additional information or guidance.

    For vulnerabilities in third-party dependencies or modules, please report them directly to the respective maintainers.

    Additional Resources

    We sincerely thank you for contributing to the security and integrity of this project!

    Copyright © 2013-2025 Niels Lohmann
    \ No newline at end of file diff --git a/features/arbitrary_types/index.html b/features/arbitrary_types/index.html index c0a4ab17a..c892d3449 100644 --- a/features/arbitrary_types/index.html +++ b/features/arbitrary_types/index.html @@ -1,4 +1,4 @@ - Arbitrary Type Conversions - JSON for Modern C++

    Arbitrary Type Conversions

    Every type can be serialized in JSON, not just STL containers and scalar types. Usually, you would do something along those lines:

    namespace ns {
+ Arbitrary Type Conversions - JSON for Modern C++      
     
     
      
     
      
     
     
     
     
      
     
     
     
     
     
      
     
     
     
     
           
    Arbitrary Type Conversions
     
    Every type can be serialized in JSON, not just STL containers and scalar types. Usually, you would do something along those lines:
     
    namespace ns {
     // a simple struct to model a person
     struct person {
         std::string name;
@@ -159,4 +159,4 @@
       value = j.template template get<T>(); // oops!
     }
 };
-
       
     
       
      
     
     
     
     
     
     Copyright © 2013-2025 Niels Lohmann 
     
     
                 
     
     
     
     
     
     
     
         
\ No newline at end of file
+
    Copyright © 2013-2025 Niels Lohmann
    \ No newline at end of file diff --git a/features/assertions/index.html b/features/assertions/index.html index 9defb2f55..90e20a800 100644 --- a/features/assertions/index.html +++ b/features/assertions/index.html @@ -1,4 +1,4 @@ - Runtime Assertions - JSON for Modern C++

    Runtime Assertions

    The code contains numerous debug assertions to ensure class invariants are valid or to detect undefined behavior. Whereas the former class invariants are nothing to be concerned with, the latter checks for undefined behavior are to detect bugs in client code.

    Switch off runtime assertions

    Runtime assertions can be switched off by defining the preprocessor macro NDEBUG (see the documentation of assert) which is the default for release builds.

    Change assertion behavior

    The behavior of runtime assertions can be changes by defining macro JSON_ASSERT(x) before including the json.hpp header.

    Function with runtime assertions

    Unchecked object access to a const value

    Function operator[] implements unchecked access for objects. Whereas a missing key is added in the case of non-const objects, accessing a const object with a missing key is undefined behavior (think of a dereferenced null pointer) and yields a runtime assertion.

    If you are not sure whether an element in an object exists, use checked access with the at function or call the contains function before.

    See also the documentation on element access.

    Example 1: Missing object key

    The following code will trigger an assertion at runtime:

    #include <nlohmann/json.hpp>
+ Runtime Assertions - JSON for Modern C++      
     
     
      
     
      
     
     
     
     
      
     
     
     
     
     
      
     
     
     
     
           
    Runtime Assertions
     
    The code contains numerous debug assertions to ensure class invariants are valid or to detect undefined behavior. Whereas the former class invariants are nothing to be concerned with, the latter checks for undefined behavior are to detect bugs in client code.
     
    Switch off runtime assertions
     
    Runtime assertions can be switched off by defining the preprocessor macro NDEBUG (see the documentation of assert) which is the default for release builds.
     
    Change assertion behavior
     
    The behavior of runtime assertions can be changes by defining macro JSON_ASSERT(x) before including the json.hpp header.
     
    Function with runtime assertions
     
    Unchecked object access to a const value
     
    Function operator[] implements unchecked access for objects. Whereas a missing key is added in the case of non-const objects, accessing a const object with a missing key is undefined behavior (think of a dereferenced null pointer) and yields a runtime assertion.
     
    If you are not sure whether an element in an object exists, use checked access with the at function or call the contains function before.
     
    See also the documentation on element access.
     
     Example 1: Missing object key 
    The following code will trigger an assertion at runtime:
     
    #include <nlohmann/json.hpp>
 
 using json = nlohmann::json;
 
@@ -43,4 +43,4 @@
     }
 }
 
     
    Output:
     
    [json.exception.parse_error.101] parse error: attempting to parse an empty input; check that your input string or stream contains the expected JSON
-
     
     
    See also
        
     
       
      
     
     
     
     
     
     Copyright © 2013-2025 Niels Lohmann 
     
     
                 
     
     
     
     
     
     
     
         
\ No newline at end of file
+

    See also

    Copyright © 2013-2025 Niels Lohmann
    \ No newline at end of file diff --git a/features/binary_formats/bjdata/index.html b/features/binary_formats/bjdata/index.html index 1388453e7..43d356b76 100644 --- a/features/binary_formats/bjdata/index.html +++ b/features/binary_formats/bjdata/index.html @@ -1,4 +1,4 @@ - BJData - JSON for Modern C++

    BJData

    The BJData format was derived from and improved upon Universal Binary JSON(UBJSON) specification (Draft 12). Specifically, it introduces an optimized array container for efficient storage of N-dimensional packed arrays (ND-arrays); it also adds 5 new type markers - [u] - uint16, [m] - uint32, [M] - uint64, [h] - float16 and [B] - byte - to unambiguously map common binary numeric types; furthermore, it uses little-endian (LE) to store all numerics instead of big-endian (BE) as in UBJSON to avoid unnecessary conversions on commonly available platforms.

    Compared to other binary JSON-like formats such as MessagePack and CBOR, both BJData and UBJSON demonstrate a rare combination of being both binary and quasi-human-readable. This is because all semantic elements in BJData and UBJSON, including the data-type markers and name/string types, are directly human-readable. Data stored in the BJData/UBJSON format is not only compact in size, fast to read/write, but also can be directly searched or read using simple processing.

    References

    Serialization

    The library uses the following mapping from JSON values types to BJData types according to the BJData specification:

    JSON value type value/range BJData type marker
    null null null Z
    boolean true true T
    boolean false false F
    number_integer -9223372036854775808..-2147483649 int64 L
    number_integer -2147483648..-32769 int32 l
    number_integer -32768..-129 int16 I
    number_integer -128..127 int8 i
    number_integer 128..255 uint8 U
    number_integer 256..32767 int16 I
    number_integer 32768..65535 uint16 u
    number_integer 65536..2147483647 int32 l
    number_integer 2147483648..4294967295 uint32 m
    number_integer 4294967296..9223372036854775807 int64 L
    number_integer 9223372036854775808..18446744073709551615 uint64 M
    number_unsigned 0..127 int8 i
    number_unsigned 128..255 uint8 U
    number_unsigned 256..32767 int16 I
    number_unsigned 32768..65535 uint16 u
    number_unsigned 65536..2147483647 int32 l
    number_unsigned 2147483648..4294967295 uint32 m
    number_unsigned 4294967296..9223372036854775807 int64 L
    number_unsigned 9223372036854775808..18446744073709551615 uint64 M
    number_float any value float64 D
    string with shortest length indicator string S
    array see notes on optimized format/ND-array array [
    object see notes on optimized format map {
    binary see notes on binary values array [$B

    Complete mapping

    The mapping is complete in the sense that any JSON value type can be converted to a BJData value.

    Any BJData output created by to_bjdata can be successfully parsed by from_bjdata.

    Size constraints

    The following values can not be converted to a BJData value:

    • strings with more than 18446744073709551615 bytes, i.e., 2^{64}-1 bytes (theoretical)

    Unused BJData markers

    The following markers are not used in the conversion:

    • Z: no-op values are not created.
    • C: single-byte strings are serialized with S markers.

    NaN/infinity handling

    If NaN or Infinity are stored inside a JSON number, they are serialized properly. This behavior differs from the dump() function which serializes NaN or Infinity to null.

    Endianness

    A breaking difference between BJData and UBJSON is the endianness of numerical values. In BJData, all numerical data types (integers UiuImlML and floating-point values hdD) are stored in the little-endian (LE) byte order as opposed to big-endian as used by UBJSON. Adopting LE to store numeric records avoids unnecessary byte swapping on most modern computers where LE is used as the default byte order.

    Optimized formats

    Optimized formats for containers are supported via two parameters of to_bjdata:

    • Parameter use_size adds size information to the beginning of a container and removes the closing marker.
    • Parameter use_type further checks whether all elements of a container have the same type and adds the type marker to the beginning of the container. The use_type parameter must only be used together with use_size = true.

    Note that use_size = true alone may result in larger representations - the benefit of this parameter is that the receiving side is immediately informed of the number of elements in the container.

    ND-array optimized format

    BJData extends UBJSON's optimized array size marker to support ND-arrays of uniform numerical data types (referred to as packed arrays). For example, the 2-D uint8 integer array [[1,2],[3,4],[5,6]], stored as nested optimized array in UBJSON [ [$U#i2 1 2 [$U#i2 3 4 [$U#i2 5 6 ], can be further compressed in BJData to [$U#[$i#i2 2 3 1 2 3 4 5 6 or [$U#[i2 i3] 1 2 3 4 5 6.

    To maintain type and size information, ND-arrays are converted to JSON objects following the annotated array format (defined in the JData specification (Draft 3)), when parsed using from_bjdata. For example, the above 2-D uint8 array can be parsed and accessed as

    {
+ BJData - JSON for Modern C++      
     
     
      
     
      
     
     
     
     
      
     
     
     
     
     
      
     
     
     
     
           
    BJData
     
    The BJData format was derived from and improved upon Universal Binary JSON(UBJSON) specification (Draft 12). Specifically, it introduces an optimized array container for efficient storage of N-dimensional packed arrays (ND-arrays); it also adds 5 new type markers - [u] - uint16, [m] - uint32, [M] - uint64, [h] - float16 and [B] - byte - to unambiguously map common binary numeric types; furthermore, it uses little-endian (LE) to store all numerics instead of big-endian (BE) as in UBJSON to avoid unnecessary conversions on commonly available platforms.
     
    Compared to other binary JSON-like formats such as MessagePack and CBOR, both BJData and UBJSON demonstrate a rare combination of being both binary and quasi-human-readable. This is because all semantic elements in BJData and UBJSON, including the data-type markers and name/string types, are directly human-readable. Data stored in the BJData/UBJSON format is not only compact in size, fast to read/write, but also can be directly searched or read using simple processing.
     
     
    References
      
     
    Serialization
     
    The library uses the following mapping from JSON values types to BJData types according to the BJData specification:
     
      
     JSON value type value/range BJData type marker 
           
     null null null Z 
     
     boolean true true T 
     
     boolean false false F 
     
     number_integer -9223372036854775808..-2147483649 int64 L 
     
     number_integer -2147483648..-32769 int32 l 
     
     number_integer -32768..-129 int16 I 
     
     number_integer -128..127 int8 i 
     
     number_integer 128..255 uint8 U 
     
     number_integer 256..32767 int16 I 
     
     number_integer 32768..65535 uint16 u 
     
     number_integer 65536..2147483647 int32 l 
     
     number_integer 2147483648..4294967295 uint32 m 
     
     number_integer 4294967296..9223372036854775807 int64 L 
     
     number_integer 9223372036854775808..18446744073709551615 uint64 M 
     
     number_unsigned 0..127 int8 i 
     
     number_unsigned 128..255 uint8 U 
     
     number_unsigned 256..32767 int16 I 
     
     number_unsigned 32768..65535 uint16 u 
     
     number_unsigned 65536..2147483647 int32 l 
     
     number_unsigned 2147483648..4294967295 uint32 m 
     
     number_unsigned 4294967296..9223372036854775807 int64 L 
     
     number_unsigned 9223372036854775808..18446744073709551615 uint64 M 
     
     number_float any value float64 D 
     
     string with shortest length indicator string S 
     
     array see notes on optimized format/ND-array array [ 
     
     object see notes on optimized format map { 
     
     binary see notes on binary values array [$B 
          
     
     
    Complete mapping
     
    The mapping is complete in the sense that any JSON value type can be converted to a BJData value.
     
    Any BJData output created by to_bjdata can be successfully parsed by from_bjdata.
     
     
     
    Size constraints
     
    The following values can not be converted to a BJData value:
     
       
    • strings with more than 18446744073709551615 bytes, i.e., 2^{64}-1 bytes (theoretical)
      •  
     
     
     
    Unused BJData markers
     
    The following markers are not used in the conversion:
     
       
    • Z: no-op values are not created.
      •  
    • C: single-byte strings are serialized with S markers.
      •  
     
     
     
    NaN/infinity handling
     
    If NaN or Infinity are stored inside a JSON number, they are serialized properly. This behavior differs from the dump() function which serializes NaN or Infinity to null.
     
     
     
    Endianness
     
    A breaking difference between BJData and UBJSON is the endianness of numerical values. In BJData, all numerical data types (integers UiuImlML and floating-point values hdD) are stored in the little-endian (LE) byte order as opposed to big-endian as used by UBJSON. Adopting LE to store numeric records avoids unnecessary byte swapping on most modern computers where LE is used as the default byte order.
     
     
     
    Optimized formats
     
    Optimized formats for containers are supported via two parameters of to_bjdata:
     
       
    • Parameter use_size adds size information to the beginning of a container and removes the closing marker.
      •  
    • Parameter use_type further checks whether all elements of a container have the same type and adds the type marker to the beginning of the container. The use_type parameter must only be used together with use_size = true.
      •  
     
    Note that use_size = true alone may result in larger representations - the benefit of this parameter is that the receiving side is immediately informed of the number of elements in the container.
     
     
     
    ND-array optimized format
     
    BJData extends UBJSON's optimized array size marker to support ND-arrays of uniform numerical data types (referred to as packed arrays). For example, the 2-D uint8 integer array [[1,2],[3,4],[5,6]], stored as nested optimized array in UBJSON [ [$U#i2 1 2 [$U#i2 3 4 [$U#i2 5 6 ], can be further compressed in BJData to [$U#[$i#i2 2 3 1 2 3 4 5 6 or [$U#[i2 i3] 1 2 3 4 5 6.
     
    To maintain type and size information, ND-arrays are converted to JSON objects following the annotated array format (defined in the JData specification (Draft 3)), when parsed using from_bjdata. For example, the above 2-D uint8 array can be parsed and accessed as
     
    {
     "_ArrayType_": "uint8",
     "_ArraySize_": [2,3],
     "_ArrayData_": [1,2,3,4,5,6]
@@ -95,4 +95,4 @@
   "compact": true,
   "schema": 0
 }
-
        
     
       
      
     
     
     
     
     
     Copyright © 2013-2025 Niels Lohmann 
     
     
                 
     
     
     
     
     
     
     
         
\ No newline at end of file
+
    Copyright © 2013-2025 Niels Lohmann
    \ No newline at end of file diff --git a/features/binary_formats/bson/index.html b/features/binary_formats/bson/index.html index 44f64b051..833455d60 100644 --- a/features/binary_formats/bson/index.html +++ b/features/binary_formats/bson/index.html @@ -1,4 +1,4 @@ - BSON - JSON for Modern C++

    BSON

    BSON, short for Binary JSON, is a binary-encoded serialization of JSON-like documents. Like JSON, BSON supports the embedding of documents and arrays within other documents and arrays. BSON also contains extensions that allow representation of data types that are not part of the JSON spec. For example, BSON has a Date type and a BinData type.

    References

    Serialization

    The library uses the following mapping from JSON values types to BSON types:

    JSON value type value/range BSON type marker
    null null null 0x0A
    boolean true, false boolean 0x08
    number_integer -9223372036854775808..-2147483649 int64 0x12
    number_integer -2147483648..2147483647 int32 0x10
    number_integer 2147483648..9223372036854775807 int64 0x12
    number_unsigned 0..2147483647 int32 0x10
    number_unsigned 2147483648..9223372036854775807 int64 0x12
    number_unsigned 9223372036854775808..18446744073709551615 uint64 0x11
    number_float any value double 0x01
    string any value string 0x02
    array any value document 0x04
    object any value document 0x03
    binary any value binary 0x05

    Incomplete mapping

    The mapping is incomplete, since only JSON-objects (and things contained therein) can be serialized to BSON. Also, keys may not contain U+0000, since they are serialized a zero-terminated c-strings.

    Example 
    #include <iostream>
+ BSON - JSON for Modern C++      
     
     
      
     
      
     
     
     
     
      
     
     
     
     
     
      
     
     
     
     
           
    BSON
     
    BSON, short for Binary JSON, is a binary-encoded serialization of JSON-like documents. Like JSON, BSON supports the embedding of documents and arrays within other documents and arrays. BSON also contains extensions that allow representation of data types that are not part of the JSON spec. For example, BSON has a Date type and a BinData type.
     
     
    References
      
     
    Serialization
     
    The library uses the following mapping from JSON values types to BSON types:
     
      
     JSON value type value/range BSON type marker 
           
     null null null 0x0A 
     
     boolean true, false boolean 0x08 
     
     number_integer -9223372036854775808..-2147483649 int64 0x12 
     
     number_integer -2147483648..2147483647 int32 0x10 
     
     number_integer 2147483648..9223372036854775807 int64 0x12 
     
     number_unsigned 0..2147483647 int32 0x10 
     
     number_unsigned 2147483648..9223372036854775807 int64 0x12 
     
     number_unsigned 9223372036854775808..18446744073709551615 uint64 0x11 
     
     number_float any value double 0x01 
     
     string any value string 0x02 
     
     array any value document 0x04 
     
     object any value document 0x03 
     
     binary any value binary 0x05 
          
     
     
    Incomplete mapping
     
    The mapping is incomplete, since only JSON-objects (and things contained therein) can be serialized to BSON. Also, keys may not contain U+0000, since they are serialized a zero-terminated c-strings.
     
     
     Example 
    #include <iostream>
 #include <iomanip>
 #include <nlohmann/json.hpp>
 
@@ -46,4 +46,4 @@
   "compact": true,
   "schema": 0
 }
-
     
       
     
       
      
     
     
     
     
     
     Copyright © 2013-2025 Niels Lohmann 
     
     
                 
     
     
     
     
     
     
     
         
\ No newline at end of file
+
    Copyright © 2013-2025 Niels Lohmann
    \ No newline at end of file diff --git a/features/binary_formats/cbor/index.html b/features/binary_formats/cbor/index.html index 6d3c70bc4..41caaa08e 100644 --- a/features/binary_formats/cbor/index.html +++ b/features/binary_formats/cbor/index.html @@ -1,4 +1,4 @@ - CBOR - JSON for Modern C++

    CBOR

    The Concise Binary Object Representation (CBOR) is a data format whose design goals include the possibility of extremely small code sizes, fairly small message size, and extensibility without the need for version negotiation.

    References

    Serialization

    The library uses the following mapping from JSON values types to CBOR types according to the CBOR specification (RFC 7049):

    JSON value type value/range CBOR type first byte
    null null Null 0xF6
    boolean true True 0xF5
    boolean false False 0xF4
    number_integer -9223372036854775808..-2147483649 Negative integer (8 bytes follow) 0x3B
    number_integer -2147483648..-32769 Negative integer (4 bytes follow) 0x3A
    number_integer -32768..-129 Negative integer (2 bytes follow) 0x39
    number_integer -128..-25 Negative integer (1 byte follow) 0x38
    number_integer -24..-1 Negative integer 0x20..0x37
    number_integer 0..23 Integer 0x00..0x17
    number_integer 24..255 Unsigned integer (1 byte follow) 0x18
    number_integer 256..65535 Unsigned integer (2 bytes follow) 0x19
    number_integer 65536..4294967295 Unsigned integer (4 bytes follow) 0x1A
    number_integer 4294967296..18446744073709551615 Unsigned integer (8 bytes follow) 0x1B
    number_unsigned 0..23 Integer 0x00..0x17
    number_unsigned 24..255 Unsigned integer (1 byte follow) 0x18
    number_unsigned 256..65535 Unsigned integer (2 bytes follow) 0x19
    number_unsigned 65536..4294967295 Unsigned integer (4 bytes follow) 0x1A
    number_unsigned 4294967296..18446744073709551615 Unsigned integer (8 bytes follow) 0x1B
    number_float any value representable by a float Single-Precision Float 0xFA
    number_float any value NOT representable by a float Double-Precision Float 0xFB
    string length: 0..23 UTF-8 string 0x60..0x77
    string length: 23..255 UTF-8 string (1 byte follow) 0x78
    string length: 256..65535 UTF-8 string (2 bytes follow) 0x79
    string length: 65536..4294967295 UTF-8 string (4 bytes follow) 0x7A
    string length: 4294967296..18446744073709551615 UTF-8 string (8 bytes follow) 0x7B
    array size: 0..23 array 0x80..0x97
    array size: 23..255 array (1 byte follow) 0x98
    array size: 256..65535 array (2 bytes follow) 0x99
    array size: 65536..4294967295 array (4 bytes follow) 0x9A
    array size: 4294967296..18446744073709551615 array (8 bytes follow) 0x9B
    object size: 0..23 map 0xA0..0xB7
    object size: 23..255 map (1 byte follow) 0xB8
    object size: 256..65535 map (2 bytes follow) 0xB9
    object size: 65536..4294967295 map (4 bytes follow) 0xBA
    object size: 4294967296..18446744073709551615 map (8 bytes follow) 0xBB
    binary size: 0..23 byte string 0x40..0x57
    binary size: 23..255 byte string (1 byte follow) 0x58
    binary size: 256..65535 byte string (2 bytes follow) 0x59
    binary size: 65536..4294967295 byte string (4 bytes follow) 0x5A
    binary size: 4294967296..18446744073709551615 byte string (8 bytes follow) 0x5B

    Binary values with subtype are mapped to tagged values (0xD8..0xDB) depending on the subtype, followed by a byte string, see "binary" cells in the table above.

    Complete mapping

    The mapping is complete in the sense that any JSON value type can be converted to a CBOR value.

    NaN/infinity handling

    If NaN or Infinity are stored inside a JSON number, they are serialized properly. This behavior differs from the normal JSON serialization which serializes NaN or Infinity to null.

    Unused CBOR types

    The following CBOR types are not used in the conversion:

    • UTF-8 strings terminated by "break" (0x7F)
    • arrays terminated by "break" (0x9F)
    • maps terminated by "break" (0xBF)
    • byte strings terminated by "break" (0x5F)
    • date/time (0xC0..0xC1)
    • bignum (0xC2..0xC3)
    • decimal fraction (0xC4)
    • bigfloat (0xC5)
    • expected conversions (0xD5..0xD7)
    • simple values (0xE0..0xF3, 0xF8)
    • undefined (0xF7)
    • half-precision floats (0xF9)
    • break (0xFF)

    Tagged items

    Binary subtypes will be serialized as tagged items. See binary values for an example.

    Example 
    #include <iostream>
+ CBOR - JSON for Modern C++      
     
     
      
     
      
     
     
     
     
      
     
     
     
     
     
      
     
     
     
     
           
    CBOR
     
    The Concise Binary Object Representation (CBOR) is a data format whose design goals include the possibility of extremely small code sizes, fairly small message size, and extensibility without the need for version negotiation.
     
     
    References
      
     
    Serialization
     
    The library uses the following mapping from JSON values types to CBOR types according to the CBOR specification (RFC 7049):
     
      
     JSON value type value/range CBOR type first byte 
           
     null null Null 0xF6 
     
     boolean true True 0xF5 
     
     boolean false False 0xF4 
     
     number_integer -9223372036854775808..-2147483649 Negative integer (8 bytes follow) 0x3B 
     
     number_integer -2147483648..-32769 Negative integer (4 bytes follow) 0x3A 
     
     number_integer -32768..-129 Negative integer (2 bytes follow) 0x39 
     
     number_integer -128..-25 Negative integer (1 byte follow) 0x38 
     
     number_integer -24..-1 Negative integer 0x20..0x37 
     
     number_integer 0..23 Integer 0x00..0x17 
     
     number_integer 24..255 Unsigned integer (1 byte follow) 0x18 
     
     number_integer 256..65535 Unsigned integer (2 bytes follow) 0x19 
     
     number_integer 65536..4294967295 Unsigned integer (4 bytes follow) 0x1A 
     
     number_integer 4294967296..18446744073709551615 Unsigned integer (8 bytes follow) 0x1B 
     
     number_unsigned 0..23 Integer 0x00..0x17 
     
     number_unsigned 24..255 Unsigned integer (1 byte follow) 0x18 
     
     number_unsigned 256..65535 Unsigned integer (2 bytes follow) 0x19 
     
     number_unsigned 65536..4294967295 Unsigned integer (4 bytes follow) 0x1A 
     
     number_unsigned 4294967296..18446744073709551615 Unsigned integer (8 bytes follow) 0x1B 
     
     number_float any value representable by a float Single-Precision Float 0xFA 
     
     number_float any value NOT representable by a float Double-Precision Float 0xFB 
     
     string length: 0..23 UTF-8 string 0x60..0x77 
     
     string length: 23..255 UTF-8 string (1 byte follow) 0x78 
     
     string length: 256..65535 UTF-8 string (2 bytes follow) 0x79 
     
     string length: 65536..4294967295 UTF-8 string (4 bytes follow) 0x7A 
     
     string length: 4294967296..18446744073709551615 UTF-8 string (8 bytes follow) 0x7B 
     
     array size: 0..23 array 0x80..0x97 
     
     array size: 23..255 array (1 byte follow) 0x98 
     
     array size: 256..65535 array (2 bytes follow) 0x99 
     
     array size: 65536..4294967295 array (4 bytes follow) 0x9A 
     
     array size: 4294967296..18446744073709551615 array (8 bytes follow) 0x9B 
     
     object size: 0..23 map 0xA0..0xB7 
     
     object size: 23..255 map (1 byte follow) 0xB8 
     
     object size: 256..65535 map (2 bytes follow) 0xB9 
     
     object size: 65536..4294967295 map (4 bytes follow) 0xBA 
     
     object size: 4294967296..18446744073709551615 map (8 bytes follow) 0xBB 
     
     binary size: 0..23 byte string 0x40..0x57 
     
     binary size: 23..255 byte string (1 byte follow) 0x58 
     
     binary size: 256..65535 byte string (2 bytes follow) 0x59 
     
     binary size: 65536..4294967295 byte string (4 bytes follow) 0x5A 
     
     binary size: 4294967296..18446744073709551615 byte string (8 bytes follow) 0x5B 
          
     
    Binary values with subtype are mapped to tagged values (0xD8..0xDB) depending on the subtype, followed by a byte string, see "binary" cells in the table above.
     
     
    Complete mapping
     
    The mapping is complete in the sense that any JSON value type can be converted to a CBOR value.
     
     
     
    NaN/infinity handling
     
    If NaN or Infinity are stored inside a JSON number, they are serialized properly. This behavior differs from the normal JSON serialization which serializes NaN or Infinity to null.
     
     
     
    Unused CBOR types
     
    The following CBOR types are not used in the conversion:
     
       
    • UTF-8 strings terminated by "break" (0x7F)
      •  
    • arrays terminated by "break" (0x9F)
      •  
    • maps terminated by "break" (0xBF)
      •  
    • byte strings terminated by "break" (0x5F)
      •  
    • date/time (0xC0..0xC1)
      •  
    • bignum (0xC2..0xC3)
      •  
    • decimal fraction (0xC4)
      •  
    • bigfloat (0xC5)
      •  
    • expected conversions (0xD5..0xD7)
      •  
    • simple values (0xE0..0xF3, 0xF8)
      •  
    • undefined (0xF7)
      •  
    • half-precision floats (0xF9)
      •  
    • break (0xFF)
      •  
     
     
     
    Tagged items
     
    Binary subtypes will be serialized as tagged items. See binary values for an example.
     
     
     Example 
    #include <iostream>
 #include <iomanip>
 #include <nlohmann/json.hpp>
 
@@ -45,4 +45,4 @@
   "compact": true,
   "schema": 0
 }
-
     
       
     
       
      
     
     
     
     
     
     Copyright © 2013-2025 Niels Lohmann 
     
     
                 
     
     
     
     
     
     
     
         
\ No newline at end of file
+
    Copyright © 2013-2025 Niels Lohmann
    \ No newline at end of file diff --git a/features/binary_formats/index.html b/features/binary_formats/index.html index c5c18bffb..8ebe5a333 100644 --- a/features/binary_formats/index.html +++ b/features/binary_formats/index.html @@ -1 +1 @@ - Binary Formats - JSON for Modern C++

    Binary Formats

    Though JSON is a ubiquitous data format, it is not a very compact format suitable for data exchange, for instance, over a network. Hence, the library supports

    to efficiently encode JSON values to byte vectors and to decode such vectors.

    Comparison

    Completeness

    Format Serialization Deserialization
    BJData complete complete
    BSON incomplete: top-level value must be an object incomplete, but all JSON types are supported
    CBOR complete incomplete, but all JSON types are supported
    MessagePack complete complete
    UBJSON complete complete

    Binary values

    Format Binary values Binary subtypes
    BJData not supported not supported
    BSON supported supported
    CBOR supported supported
    MessagePack supported supported
    UBJSON not supported not supported

    See binary values for more information.

    Sizes

    Format canada.json twitter.json citm_catalog.json jeopardy.json
    BJData 53.2 % 91.1 % 78.1 % 96.6 %
    BJData (size) 58.6 % 92.1 % 86.7 % 97.4 %
    BJData (size+tyoe) 58.6 % 92.1 % 86.5 % 97.4 %
    BSON 85.8 % 95.2 % 95.8 % 106.7 %
    CBOR 50.5 % 86.3 % 68.4 % 88.0 %
    MessagePack 50.5 % 86.0 % 68.5 % 87.9 %
    UBJSON 53.2 % 91.3 % 78.2 % 96.6 %
    UBJSON (size) 58.6 % 92.3 % 86.8 % 97.4 %
    UBJSON (size+type) 55.9 % 92.3 % 85.0 % 95.0 %

    Sizes compared to minified JSON value.

    Copyright © 2013-2025 Niels Lohmann
    \ No newline at end of file + Binary Formats - JSON for Modern C++

    Binary Formats

    Though JSON is a ubiquitous data format, it is not a very compact format suitable for data exchange, for instance, over a network. Hence, the library supports

    to efficiently encode JSON values to byte vectors and to decode such vectors.

    Comparison

    Completeness

    Format Serialization Deserialization
    BJData complete complete
    BSON incomplete: top-level value must be an object incomplete, but all JSON types are supported
    CBOR complete incomplete, but all JSON types are supported
    MessagePack complete complete
    UBJSON complete complete

    Binary values

    Format Binary values Binary subtypes
    BJData not supported not supported
    BSON supported supported
    CBOR supported supported
    MessagePack supported supported
    UBJSON not supported not supported

    See binary values for more information.

    Sizes

    Format canada.json twitter.json citm_catalog.json jeopardy.json
    BJData 53.2 % 91.1 % 78.1 % 96.6 %
    BJData (size) 58.6 % 92.1 % 86.7 % 97.4 %
    BJData (size+tyoe) 58.6 % 92.1 % 86.5 % 97.4 %
    BSON 85.8 % 95.2 % 95.8 % 106.7 %
    CBOR 50.5 % 86.3 % 68.4 % 88.0 %
    MessagePack 50.5 % 86.0 % 68.5 % 87.9 %
    UBJSON 53.2 % 91.3 % 78.2 % 96.6 %
    UBJSON (size) 58.6 % 92.3 % 86.8 % 97.4 %
    UBJSON (size+type) 55.9 % 92.3 % 85.0 % 95.0 %

    Sizes compared to minified JSON value.

    Copyright © 2013-2025 Niels Lohmann
    \ No newline at end of file diff --git a/features/binary_formats/messagepack/index.html b/features/binary_formats/messagepack/index.html index b6be8de83..06d8c156d 100644 --- a/features/binary_formats/messagepack/index.html +++ b/features/binary_formats/messagepack/index.html @@ -1,4 +1,4 @@ - MessagePack - JSON for Modern C++

    MessagePack

    MessagePack is an efficient binary serialization format. It lets you exchange data among multiple languages like JSON. But it's faster and smaller. Small integers are encoded into a single byte, and typical short strings require only one extra byte in addition to the strings themselves.

    References

    Serialization

    The library uses the following mapping from JSON values types to MessagePack types according to the MessagePack specification:

    JSON value type value/range MessagePack type first byte
    null null nil 0xC0
    boolean true true 0xC3
    boolean false false 0xC2
    number_integer -9223372036854775808..-2147483649 int64 0xD3
    number_integer -2147483648..-32769 int32 0xD2
    number_integer -32768..-129 int16 0xD1
    number_integer -128..-33 int8 0xD0
    number_integer -32..-1 negative fixint 0xE0..0xFF
    number_integer 0..127 positive fixint 0x00..0x7F
    number_integer 128..255 uint 8 0xCC
    number_integer 256..65535 uint 16 0xCD
    number_integer 65536..4294967295 uint 32 0xCE
    number_integer 4294967296..18446744073709551615 uint 64 0xCF
    number_unsigned 0..127 positive fixint 0x00..0x7F
    number_unsigned 128..255 uint 8 0xCC
    number_unsigned 256..65535 uint 16 0xCD
    number_unsigned 65536..4294967295 uint 32 0xCE
    number_unsigned 4294967296..18446744073709551615 uint 64 0xCF
    number_float any value representable by a float float 32 0xCA
    number_float any value NOT representable by a float float 64 0xCB
    string length: 0..31 fixstr 0xA0..0xBF
    string length: 32..255 str 8 0xD9
    string length: 256..65535 str 16 0xDA
    string length: 65536..4294967295 str 32 0xDB
    array size: 0..15 fixarray 0x90..0x9F
    array size: 16..65535 array 16 0xDC
    array size: 65536..4294967295 array 32 0xDD
    object size: 0..15 fix map 0x80..0x8F
    object size: 16..65535 map 16 0xDE
    object size: 65536..4294967295 map 32 0xDF
    binary size: 0..255 bin 8 0xC4
    binary size: 256..65535 bin 16 0xC5
    binary size: 65536..4294967295 bin 32 0xC6

    Complete mapping

    The mapping is complete in the sense that any JSON value type can be converted to a MessagePack value.

    Any MessagePack output created by to_msgpack can be successfully parsed by from_msgpack.

    Size constraints

    The following values can not be converted to a MessagePack value:

    • strings with more than 4294967295 bytes
    • byte strings with more than 4294967295 bytes
    • arrays with more than 4294967295 elements
    • objects with more than 4294967295 elements

    NaN/infinity handling

    If NaN or Infinity are stored inside a JSON number, they are serialized properly in contrast to the dump function which serializes NaN or Infinity to null.

    Example 
    #include <iostream>
+ MessagePack - JSON for Modern C++      
     
     
      
     
      
     
     
     
     
      
     
     
     
     
     
      
     
     
     
     
           
    MessagePack
     
    MessagePack is an efficient binary serialization format. It lets you exchange data among multiple languages like JSON. But it's faster and smaller. Small integers are encoded into a single byte, and typical short strings require only one extra byte in addition to the strings themselves.
     
     
    References
      
     
    Serialization
     
    The library uses the following mapping from JSON values types to MessagePack types according to the MessagePack specification:
     
      
     JSON value type value/range MessagePack type first byte 
           
     null null nil 0xC0 
     
     boolean true true 0xC3 
     
     boolean false false 0xC2 
     
     number_integer -9223372036854775808..-2147483649 int64 0xD3 
     
     number_integer -2147483648..-32769 int32 0xD2 
     
     number_integer -32768..-129 int16 0xD1 
     
     number_integer -128..-33 int8 0xD0 
     
     number_integer -32..-1 negative fixint 0xE0..0xFF 
     
     number_integer 0..127 positive fixint 0x00..0x7F 
     
     number_integer 128..255 uint 8 0xCC 
     
     number_integer 256..65535 uint 16 0xCD 
     
     number_integer 65536..4294967295 uint 32 0xCE 
     
     number_integer 4294967296..18446744073709551615 uint 64 0xCF 
     
     number_unsigned 0..127 positive fixint 0x00..0x7F 
     
     number_unsigned 128..255 uint 8 0xCC 
     
     number_unsigned 256..65535 uint 16 0xCD 
     
     number_unsigned 65536..4294967295 uint 32 0xCE 
     
     number_unsigned 4294967296..18446744073709551615 uint 64 0xCF 
     
     number_float any value representable by a float float 32 0xCA 
     
     number_float any value NOT representable by a float float 64 0xCB 
     
     string length: 0..31 fixstr 0xA0..0xBF 
     
     string length: 32..255 str 8 0xD9 
     
     string length: 256..65535 str 16 0xDA 
     
     string length: 65536..4294967295 str 32 0xDB 
     
     array size: 0..15 fixarray 0x90..0x9F 
     
     array size: 16..65535 array 16 0xDC 
     
     array size: 65536..4294967295 array 32 0xDD 
     
     object size: 0..15 fix map 0x80..0x8F 
     
     object size: 16..65535 map 16 0xDE 
     
     object size: 65536..4294967295 map 32 0xDF 
     
     binary size: 0..255 bin 8 0xC4 
     
     binary size: 256..65535 bin 16 0xC5 
     
     binary size: 65536..4294967295 bin 32 0xC6 
          
     
     
    Complete mapping
     
    The mapping is complete in the sense that any JSON value type can be converted to a MessagePack value.
     
    Any MessagePack output created by to_msgpack can be successfully parsed by from_msgpack.
     
     
     
    Size constraints
     
    The following values can not be converted to a MessagePack value:
     
       
    • strings with more than 4294967295 bytes
      •  
    • byte strings with more than 4294967295 bytes
      •  
    • arrays with more than 4294967295 elements
      •  
    • objects with more than 4294967295 elements
      •  
     
     
     
    NaN/infinity handling
     
    If NaN or Infinity are stored inside a JSON number, they are serialized properly in contrast to the dump function which serializes NaN or Infinity to null.
     
     
     Example 
    #include <iostream>
 #include <iomanip>
 #include <nlohmann/json.hpp>
 
@@ -45,4 +45,4 @@
   "compact": true,
   "schema": 0
 }
-
     
       
     
       
      
     
     
     
     
     
     Copyright © 2013-2025 Niels Lohmann 
     
     
                 
     
     
     
     
     
     
     
         
\ No newline at end of file
+
    Copyright © 2013-2025 Niels Lohmann
    \ No newline at end of file diff --git a/features/binary_formats/ubjson/index.html b/features/binary_formats/ubjson/index.html index caf156736..e40daa5cc 100644 --- a/features/binary_formats/ubjson/index.html +++ b/features/binary_formats/ubjson/index.html @@ -1,4 +1,4 @@ - UBJSON - JSON for Modern C++

    UBJSON

    Universal Binary JSON (UBJSON) is a binary form directly imitating JSON, but requiring fewer bytes of data. It aims to achieve the generality of JSON, combined with being much easier to process than JSON.

    References

    Serialization

    The library uses the following mapping from JSON values types to UBJSON types according to the UBJSON specification:

    JSON value type value/range UBJSON type marker
    null null null Z
    boolean true true T
    boolean false false F
    number_integer -9223372036854775808..-2147483649 int64 L
    number_integer -2147483648..-32769 int32 l
    number_integer -32768..-129 int16 I
    number_integer -128..127 int8 i
    number_integer 128..255 uint8 U
    number_integer 256..32767 int16 I
    number_integer 32768..2147483647 int32 l
    number_integer 2147483648..9223372036854775807 int64 L
    number_unsigned 0..127 int8 i
    number_unsigned 128..255 uint8 U
    number_unsigned 256..32767 int16 I
    number_unsigned 32768..2147483647 int32 l
    number_unsigned 2147483648..9223372036854775807 int64 L
    number_unsigned 2147483649..18446744073709551615 high-precision H
    number_float any value float64 D
    string with shortest length indicator string S
    array see notes on optimized format array [
    object see notes on optimized format map {

    Complete mapping

    The mapping is complete in the sense that any JSON value type can be converted to a UBJSON value.

    Any UBJSON output created by to_ubjson can be successfully parsed by from_ubjson.

    Size constraints

    The following values can not be converted to a UBJSON value:

    • strings with more than 9223372036854775807 bytes (theoretical)

    Unused UBJSON markers

    The following markers are not used in the conversion:

    • Z: no-op values are not created.
    • C: single-byte strings are serialized with S markers.

    NaN/infinity handling

    If NaN or Infinity are stored inside a JSON number, they are serialized properly. This behavior differs from the dump() function which serializes NaN or Infinity to null.

    Optimized formats

    The optimized formats for containers are supported: Parameter use_size adds size information to the beginning of a container and removes the closing marker. Parameter use_type further checks whether all elements of a container have the same type and adds the type marker to the beginning of the container. The use_type parameter must only be used together with use_size = true.

    Note that use_size = true alone may result in larger representations - the benefit of this parameter is that the receiving side is immediately informed on the number of elements of the container.

    Binary values

    If the JSON data contains the binary type, the value stored is a list of integers, as suggested by the UBJSON documentation. In particular, this means that serialization and the deserialization of a JSON containing binary values into UBJSON and back will result in a different JSON object.

    Example 
    #include <iostream>
+ UBJSON - JSON for Modern C++      
     
     
      
     
      
     
     
     
     
      
     
     
     
     
     
      
     
     
     
     
           
    UBJSON
     
    Universal Binary JSON (UBJSON) is a binary form directly imitating JSON, but requiring fewer bytes of data. It aims to achieve the generality of JSON, combined with being much easier to process than JSON.
     
     
    References
      
     
    Serialization
     
    The library uses the following mapping from JSON values types to UBJSON types according to the UBJSON specification:
     
      
     JSON value type value/range UBJSON type marker 
           
     null null null Z 
     
     boolean true true T 
     
     boolean false false F 
     
     number_integer -9223372036854775808..-2147483649 int64 L 
     
     number_integer -2147483648..-32769 int32 l 
     
     number_integer -32768..-129 int16 I 
     
     number_integer -128..127 int8 i 
     
     number_integer 128..255 uint8 U 
     
     number_integer 256..32767 int16 I 
     
     number_integer 32768..2147483647 int32 l 
     
     number_integer 2147483648..9223372036854775807 int64 L 
     
     number_unsigned 0..127 int8 i 
     
     number_unsigned 128..255 uint8 U 
     
     number_unsigned 256..32767 int16 I 
     
     number_unsigned 32768..2147483647 int32 l 
     
     number_unsigned 2147483648..9223372036854775807 int64 L 
     
     number_unsigned 2147483649..18446744073709551615 high-precision H 
     
     number_float any value float64 D 
     
     string with shortest length indicator string S 
     
     array see notes on optimized format array [ 
     
     object see notes on optimized format map { 
          
     
     
    Complete mapping
     
    The mapping is complete in the sense that any JSON value type can be converted to a UBJSON value.
     
    Any UBJSON output created by to_ubjson can be successfully parsed by from_ubjson.
     
     
     
    Size constraints
     
    The following values can not be converted to a UBJSON value:
     
       
    • strings with more than 9223372036854775807 bytes (theoretical)
      •  
     
     
     
    Unused UBJSON markers
     
    The following markers are not used in the conversion:
     
       
    • Z: no-op values are not created.
      •  
    • C: single-byte strings are serialized with S markers.
      •  
     
     
     
    NaN/infinity handling
     
    If NaN or Infinity are stored inside a JSON number, they are serialized properly. This behavior differs from the dump() function which serializes NaN or Infinity to null.
     
     
     
    Optimized formats
     
    The optimized formats for containers are supported: Parameter use_size adds size information to the beginning of a container and removes the closing marker. Parameter use_type further checks whether all elements of a container have the same type and adds the type marker to the beginning of the container. The use_type parameter must only be used together with use_size = true.
     
    Note that use_size = true alone may result in larger representations - the benefit of this parameter is that the receiving side is immediately informed on the number of elements of the container.
     
     
     
    Binary values
     
    If the JSON data contains the binary type, the value stored is a list of integers, as suggested by the UBJSON documentation. In particular, this means that serialization and the deserialization of a JSON containing binary values into UBJSON and back will result in a different JSON object.
     
     
     Example 
    #include <iostream>
 #include <iomanip>
 #include <nlohmann/json.hpp>
 
@@ -90,4 +90,4 @@
   "compact": true,
   "schema": 0
 }
-
     
       
     
       
      
     
     
     
     
     
     Copyright © 2013-2025 Niels Lohmann 
     
     
                 
     
     
     
     
     
     
     
         
\ No newline at end of file
+
    Copyright © 2013-2025 Niels Lohmann
    \ No newline at end of file diff --git a/features/binary_values/index.html b/features/binary_values/index.html index a8663d152..8dc5ef006 100644 --- a/features/binary_values/index.html +++ b/features/binary_values/index.html @@ -1,4 +1,4 @@ - Binary Values - JSON for Modern C++

    Binary Values

    The library implements several binary formats that encode JSON in an efficient way. Most of these formats support binary values; that is, values that have semantics defined outside the library and only define a sequence of bytes to be stored.

    JSON itself does not have a binary value. As such, binary values are an extension that this library implements to store values received by a binary format. Binary values are never created by the JSON parser and are only part of a serialized JSON text if they have been created manually or via a binary format.

    API for binary values

    classDiagram
+ Binary Values - JSON for Modern C++      
     
     
      
     
      
     
     
     
     
      
     
     
     
     
     
      
     
     
     
     
           
    Binary Values
     
    The library implements several binary formats that encode JSON in an efficient way. Most of these formats support binary values; that is, values that have semantics defined outside the library and only define a sequence of bytes to be stored.
     
    JSON itself does not have a binary value. As such, binary values are an extension that this library implements to store values received by a binary format. Binary values are never created by the JSON parser and are only part of a serialized JSON text if they have been created manually or via a binary format.
     
    API for binary values
     
    classDiagram
 
 class binary_t ["json::binary_t"] {
     +void set_subtype(std::uint64_t subtype)
@@ -154,4 +154,4 @@ vector <|-- binary_t
     
    By default, binary values are stored as

    Note that subtype (42) is not serialized and that UBJSON has no binary type, and deserializing v would yield the following value:

    {
   "binary": [202, 254, 186, 190]
 }
-
    Copyright © 2013-2025 Niels Lohmann
    \ No newline at end of file +
    Copyright © 2013-2025 Niels Lohmann
    \ No newline at end of file diff --git a/features/comments/index.html b/features/comments/index.html index 2a6d37901..501bb32ae 100644 --- a/features/comments/index.html +++ b/features/comments/index.html @@ -1,4 +1,4 @@ - Comments - JSON for Modern C++

    Comments

    This library does not support comments by default. It does so for three reasons:

    1. Comments are not part of the JSON specification. You may argue that // or /* */ are allowed in JavaScript, but JSON is not JavaScript.

    2. This was not an oversight: Douglas Crockford wrote on this in May 2012:

      I removed comments from JSON because I saw people were using them to hold parsing directives, a practice which would have destroyed interoperability. I know that the lack of comments makes some people sad, but it shouldn't.

      Suppose you are using JSON to keep configuration files, which you would like to annotate. Go ahead and insert all the comments you like. Then pipe it through JSMin before handing it to your JSON parser.

    3. It is dangerous for interoperability if some libraries add comment support while others do not. Please check The Harmful Consequences of the Robustness Principle on this.

    However, you can set parameter ignore_comments to true in the parse function to ignore // or /* */ comments. Comments will then be treated as whitespace.

    For more information, see JSON With Commas and Comments (JWCC).

    Example

    Consider the following JSON with comments.

    {
+ Comments - JSON for Modern C++      
     
     
      
     
      
     
     
     
     
      
     
     
     
     
     
      
     
     
     
     
           
    Comments
     
    This library does not support comments by default. It does so for three reasons:
     
       
    1. Comments are not part of the JSON specification. You may argue that // or /* */ are allowed in JavaScript, but JSON is not JavaScript.
      2.  
    2.  
      This was not an oversight: Douglas Crockford wrote on this in May 2012:
       
       
      I removed comments from JSON because I saw people were using them to hold parsing directives, a practice which would have destroyed interoperability. I know that the lack of comments makes some people sad, but it shouldn't. 
       
      Suppose you are using JSON to keep configuration files, which you would like to annotate. Go ahead and insert all the comments you like. Then pipe it through JSMin before handing it to your JSON parser.
       
       
      3.  
    3.  
      It is dangerous for interoperability if some libraries add comment support while others do not. Please check The Harmful Consequences of the Robustness Principle on this.
       
      4.  
     
    However, you can set parameter ignore_comments to true in the parse function to ignore // or /* */ comments. Comments will then be treated as whitespace.
     
    For more information, see JSON With Commas and Comments (JWCC).
     
     
    Example
     
    Consider the following JSON with comments.
     
    {
     // update in 2006: removed Pluto
     "planets": ["Mercury", "Venus", "Earth", "Mars",
                 "Jupiter", "Uranus", "Neptune" /*, "Pluto" */]
@@ -45,4 +45,4 @@
     "Neptune"
   ]
 }
-
     
       
     
       
      
     
     
     
     
     
     Copyright © 2013-2025 Niels Lohmann 
     
     
                 
     
     
     
     
     
     
     
         
\ No newline at end of file
+
    Copyright © 2013-2025 Niels Lohmann
    \ No newline at end of file diff --git a/features/element_access/checked_access/index.html b/features/element_access/checked_access/index.html index da1ab6bb7..79909ff0a 100644 --- a/features/element_access/checked_access/index.html +++ b/features/element_access/checked_access/index.html @@ -1,4 +1,4 @@ - Checked access: at - JSON for Modern C++

    Checked access: at

    Overview

    The at member function performs checked access; that is, it returns a reference to the desired value if it exists and throws a basic_json::out_of_range exception otherwise.

    Read access

    Consider the following JSON value:

    {
+ Checked access: at - JSON for Modern C++      
     
     
      
     
      
     
     
     
     
      
     
     
     
     
     
      
     
     
     
     
           
    Checked access: at
     
    Overview
     
    The at member function performs checked access; that is, it returns a reference to the desired value if it exists and throws a basic_json::out_of_range exception otherwise.
     
     Read access 
    Consider the following JSON value:
     
    {
     "name": "Mary Smith",
     "age": 42,
     "hobbies": ["hiking", "reading"]
@@ -12,4 +12,4 @@
 
     
     
    When accessing an invalid index (i.e., an index greater than or equal to the array size) or the passed object key is non-existing, an exception is thrown.
     
     Accessing via invalid index or missing key 
    j.at("hobbies").at(3) = "cooking";
 
     
    This code produces the following exception:
     
    [json.exception.out_of_range.401] array index 3 is out of range
 
     
    When you extended diagnostic messages are enabled by defining JSON_DIAGNOSTICS, the exception further gives information where the key or index is missing or out of range.
     
    [json.exception.out_of_range.401] (/hobbies) array index 3 is out of range
-
     
     
    Notes
     
     
    Exceptions
     
       
    • at can only be used with objects (with a string argument) or with arrays (with a numeric argument). For other types, a basic_json::type_error is thrown.
      •  
    • basic_json::out_of_range exception exceptions are thrown if the provided key is not found in an object or the provided index is invalid.
      •  
     
     
    Summary
     
      
     scenario non-const value const value 
           
     access to existing object key reference to existing value is returned const reference to existing value is returned 
     
     access to valid array index reference to existing value is returned const reference to existing value is returned 
     
     access to non-existing object key basic_json::out_of_range exception is thrown basic_json::out_of_range exception is thrown 
     
     access to invalid array index basic_json::out_of_range exception is thrown basic_json::out_of_range exception is thrown 
          
       
     
       
      
     
     
     
     
     
     Copyright © 2013-2025 Niels Lohmann 
     
     
                 
     
     
     
     
     
     
     
         
\ No newline at end of file
+

    Notes

    Exceptions

    • at can only be used with objects (with a string argument) or with arrays (with a numeric argument). For other types, a basic_json::type_error is thrown.
    • basic_json::out_of_range exception exceptions are thrown if the provided key is not found in an object or the provided index is invalid.

    Summary

    scenario non-const value const value
    access to existing object key reference to existing value is returned const reference to existing value is returned
    access to valid array index reference to existing value is returned const reference to existing value is returned
    access to non-existing object key basic_json::out_of_range exception is thrown basic_json::out_of_range exception is thrown
    access to invalid array index basic_json::out_of_range exception is thrown basic_json::out_of_range exception is thrown
    Copyright © 2013-2025 Niels Lohmann
    \ No newline at end of file diff --git a/features/element_access/default_value/index.html b/features/element_access/default_value/index.html index 7daa72630..ec44eb603 100644 --- a/features/element_access/default_value/index.html +++ b/features/element_access/default_value/index.html @@ -1,4 +1,4 @@ - Access with default value: value - JSON for Modern C++

    Access with default value: value

    Overview

    In many situations, such as configuration files, missing values are not exceptional, but may be treated as if a default value was present. For this case, use value(key, default_value) which takes the key you want to access and a default value in case there is no value stored with that key.

    Example

    Example

    Consider the following JSON value:

    {
+ Access with default value: value - JSON for Modern C++      
     
     
      
     
      
     
     
     
     
      
     
     
     
     
     
      
     
     
     
     
           
    Access with default value: value
     
    Overview
     
    In many situations, such as configuration files, missing values are not exceptional, but may be treated as if a default value was present. For this case, use value(key, default_value) which takes the key you want to access and a default value in case there is no value stored with that key.
     
    Example
     
     Example 
    Consider the following JSON value:
     
    {
     "logOutput": "result.log",
     "append": true
 }
@@ -20,4 +20,4 @@
 default value (int):       -1
 default value (uint64_t):  18446744073709551615
 explict return value type: 18446744073709551615
-
     
     
    See also
    Copyright © 2013-2025 Niels Lohmann
    \ No newline at end of file +

    See also

    Copyright © 2013-2025 Niels Lohmann
    \ No newline at end of file diff --git a/features/element_access/index.html b/features/element_access/index.html index a2e895d0e..0818cd180 100644 --- a/features/element_access/index.html +++ b/features/element_access/index.html @@ -1 +1 @@ - Element Access - JSON for Modern C++

    Element Access

    There are many ways elements in a JSON value can be accessed:

    • unchecked access via operator[]
    • checked access via at
    • access with default value via value
    • iterators
    • JSON pointers
    Copyright © 2013-2025 Niels Lohmann
    \ No newline at end of file + Element Access - JSON for Modern C++

    Element Access

    There are many ways elements in a JSON value can be accessed:

    • unchecked access via operator[]
    • checked access via at
    • access with default value via value
    • iterators
    • JSON pointers
    Copyright © 2013-2025 Niels Lohmann
    \ No newline at end of file diff --git a/features/element_access/unchecked_access/index.html b/features/element_access/unchecked_access/index.html index 042877eb7..9aae6c703 100644 --- a/features/element_access/unchecked_access/index.html +++ b/features/element_access/unchecked_access/index.html @@ -1,4 +1,4 @@ - Unchecked access: operator[] - JSON for Modern C++

    Unchecked access: operator[]

    Overview

    Elements in a JSON object and a JSON array can be accessed via operator[] similar to a std::map and a std::vector, respectively.

    Read access

    Consider the following JSON value:

    {
+ Unchecked access: operator[] - JSON for Modern C++      
     
     
      
     
      
     
     
     
     
      
     
     
     
     
     
      
     
     
     
     
           
    Unchecked access: operator[]
     
    Overview
     
    Elements in a JSON object and a JSON array can be accessed via operator[] similar to a std::map and a std::vector, respectively.
     
     Read access 
    Consider the following JSON value:
     
    {
     "name": "Mary Smith",
     "age": 42,
     "hobbies": ["hiking", "reading"]
@@ -19,4 +19,4 @@
     "age": 42,
     "hobbies": ["running", "reading", null, "cooking"]
 }
-
     
     
    Notes
     
     
    Design rationale
     
    The library behaves differently to std::vector and std::map:
     
       
    • std::vector::operator[] never inserts a new element.
      •  
    • std::map::operator[] is not available for const values.
      •  
     
    The type json wraps all JSON value types. It would be impossible to remove operator[] for const objects. At the same time, inserting elements for non-const objects is really convenient as it avoids awkward insert calls. To this end, we decided to have an inserting non-const behavior for both arrays and objects.
     
     
     
    Info
     
    The access is unchecked. In case the passed object key does not exist or the passed array index is invalid, no exception is thrown.
     
     
     
    Danger
     
       
    • It is undefined behavior to access a const object with a non-existing key.
      •  
    • It is undefined behavior to access a const array with an invalid index.
      •  
    • In debug mode, an assertion will fire in both cases. You can disable assertions by defining the preprocessor symbol NDEBUG or redefine the macro JSON_ASSERT(x). See the documentation on runtime assertions for more information.
      •  
     
     
     
    Exceptions
     
    operator[] can only be used with objects (with a string argument) or with arrays (with a numeric argument). For other types, a basic_json::type_error is thrown.
     
     
    Summary
     
      
     scenario non-const value const value 
           
     access to existing object key reference to existing value is returned const reference to existing value is returned 
     
     access to valid array index reference to existing value is returned const reference to existing value is returned 
     
     access to non-existing object key reference to newly inserted null value is returned undefined behavior; runtime assertion in debug mode 
     
     access to invalid array index reference to newly inserted null value is returned; any index between previous maximal index and passed index are filled with null undefined behavior; runtime assertion in debug mode 
          
       
     
       
      
     
     
     
     
     
     Copyright © 2013-2025 Niels Lohmann 
     
     
                 
     
     
     
     
     
     
     
         
\ No newline at end of file
+

    Notes

    Design rationale

    The library behaves differently to std::vector and std::map:

    • std::vector::operator[] never inserts a new element.
    • std::map::operator[] is not available for const values.

    The type json wraps all JSON value types. It would be impossible to remove operator[] for const objects. At the same time, inserting elements for non-const objects is really convenient as it avoids awkward insert calls. To this end, we decided to have an inserting non-const behavior for both arrays and objects.

    Info

    The access is unchecked. In case the passed object key does not exist or the passed array index is invalid, no exception is thrown.

    Danger

    • It is undefined behavior to access a const object with a non-existing key.
    • It is undefined behavior to access a const array with an invalid index.
    • In debug mode, an assertion will fire in both cases. You can disable assertions by defining the preprocessor symbol NDEBUG or redefine the macro JSON_ASSERT(x). See the documentation on runtime assertions for more information.

    Exceptions

    operator[] can only be used with objects (with a string argument) or with arrays (with a numeric argument). For other types, a basic_json::type_error is thrown.

    Summary

    scenario non-const value const value
    access to existing object key reference to existing value is returned const reference to existing value is returned
    access to valid array index reference to existing value is returned const reference to existing value is returned
    access to non-existing object key reference to newly inserted null value is returned undefined behavior; runtime assertion in debug mode
    access to invalid array index reference to newly inserted null value is returned; any index between previous maximal index and passed index are filled with null undefined behavior; runtime assertion in debug mode
    Copyright © 2013-2025 Niels Lohmann
    \ No newline at end of file diff --git a/features/enum_conversion/index.html b/features/enum_conversion/index.html index 73b62158a..05a8a0224 100644 --- a/features/enum_conversion/index.html +++ b/features/enum_conversion/index.html @@ -1,4 +1,4 @@ - Specializing enum conversion - JSON for Modern C++

    Specializing enum conversion

    By default, enum values are serialized to JSON as integers. In some cases, this could result in undesired behavior. If the integer values of any enum values are changed after data using those enum values has been serialized to JSON, then deserializing that JSON would result in a different enum value being restored, or the value not being found at all.

    It is possible to more precisely specify how a given enum is mapped to and from JSON as shown below:

    // example enum type declaration
+ Specializing enum conversion - JSON for Modern C++      
     
     
      
     
      
     
     
     
     
      
     
     
     
     
     
      
     
     
     
     
           
    Specializing enum conversion
     
    By default, enum values are serialized to JSON as integers. In some cases, this could result in undesired behavior. If the integer values of any enum values are changed after data using those enum values has been serialized to JSON, then deserializing that JSON would result in a different enum value being restored, or the value not being found at all.
     
    It is possible to more precisely specify how a given enum is mapped to and from JSON as shown below:
     
    // example enum type declaration
 enum TaskState {
     TS_STOPPED,
     TS_RUNNING,
@@ -24,4 +24,4 @@
 // undefined json value to enum (where the first map entry above is the default)
 json jPi = 3.14;
 assert(jPi.template get<TaskState>() == TS_INVALID );
-
     
    Notes
     
    Just as in Arbitrary Type Conversions above,
     
       
    • NLOHMANN_JSON_SERIALIZE_ENUM() MUST be declared in your enum type's namespace (which can be the global namespace), or the library will not be able to locate it, and it will default to integer serialization.
      •  
    • It MUST be available (e.g., proper headers must be included) everywhere you use the conversions.
      •  
     
    Other Important points:
     
       
    • When using template get<ENUM_TYPE>(), undefined JSON values will default to the first pair specified in your map. Select this default pair carefully.
      •  
    • If an enum or JSON value is specified more than once in your map, the first matching occurrence from the top of the map will be returned when converting to or from JSON.
      •  
    • To disable the default serialization of enumerators as integers and force a compiler error instead, see JSON_DISABLE_ENUM_SERIALIZATION.
      •  
       
     
       
      
     
     
     
     
     
     Copyright © 2013-2025 Niels Lohmann 
     
     
                 
     
     
     
     
     
     
     
         
\ No newline at end of file
+

    Notes

    Just as in Arbitrary Type Conversions above,

    • NLOHMANN_JSON_SERIALIZE_ENUM() MUST be declared in your enum type's namespace (which can be the global namespace), or the library will not be able to locate it, and it will default to integer serialization.
    • It MUST be available (e.g., proper headers must be included) everywhere you use the conversions.

    Other Important points:

    • When using template get<ENUM_TYPE>(), undefined JSON values will default to the first pair specified in your map. Select this default pair carefully.
    • If an enum or JSON value is specified more than once in your map, the first matching occurrence from the top of the map will be returned when converting to or from JSON.
    • To disable the default serialization of enumerators as integers and force a compiler error instead, see JSON_DISABLE_ENUM_SERIALIZATION.
    Copyright © 2013-2025 Niels Lohmann
    \ No newline at end of file diff --git a/features/iterators/index.html b/features/iterators/index.html index c5a8f886f..216847cc8 100644 --- a/features/iterators/index.html +++ b/features/iterators/index.html @@ -1,4 +1,4 @@ - Iterators - JSON for Modern C++

    Iterators

    Overview

    A basic_json value is a container and allows access via iterators. Depending on the value type, basic_json stores zero or more values.

    As for other containers, begin() returns an iterator to the first value and end() returns an iterator to the value following the last value. The latter iterator is a placeholder and cannot be dereferenced. In case of null values, empty arrays, or empty objects, begin() will return end().

    Illustration from cppreference.com

    Iteration order for objects

    When iterating over objects, values are ordered with respect to the object_comparator_t type which defaults to std::less. See the types documentation for more information.

    Example 
    // create JSON object {"one": 1, "two": 2, "three": 3}
+ Iterators - JSON for Modern C++      
     
     
      
     
      
     
     
     
     
      
     
     
     
     
     
      
     
     
     
     
           
    Iterators
     
    Overview
     
    A basic_json value is a container and allows access via iterators. Depending on the value type, basic_json stores zero or more values.
     
    As for other containers, begin() returns an iterator to the first value and end() returns an iterator to the value following the last value. The latter iterator is a placeholder and cannot be dereferenced. In case of null values, empty arrays, or empty objects, begin() will return end().
     
    Illustration from cppreference.com
     
    Iteration order for objects
     
    When iterating over objects, values are ordered with respect to the object_comparator_t type which defaults to std::less. See the types documentation for more information.
     
     Example 
    // create JSON object {"one": 1, "two": 2, "three": 3}
 json j;
 j["one"] = 1;
 j["two"] = 2;
@@ -53,4 +53,4 @@
     std::cout << *it << std::endl;
 }
 
     
    Output:
     
    "Hello, world"
-
     
     
    Iterator invalidation
     
      
     Operations invalidated iterators 
           
     clear all 
          
       
     
       
      
     
     
     
     
     
     Copyright © 2013-2025 Niels Lohmann 
     
     
                 
     
     
     
     
     
     
     
         
\ No newline at end of file
+

    Iterator invalidation

    Operations invalidated iterators
    clear all
    Copyright © 2013-2025 Niels Lohmann
    \ No newline at end of file diff --git a/features/json_patch/index.html b/features/json_patch/index.html index 2ee3a67ba..910d3c9c5 100644 --- a/features/json_patch/index.html +++ b/features/json_patch/index.html @@ -1,4 +1,4 @@ - JSON Patch and Diff - JSON for Modern C++

    JSON Patch and Diff

    Patches

    JSON Patch (RFC 6902) defines a JSON document structure for expressing a sequence of operations to apply to a JSON document. With the patch function, a JSON Patch is applied to the current JSON value by executing all operations from the patch.

    Example

    The following code shows how a JSON patch is applied to a value.

    #include <iostream>
+ JSON Patch and Diff - JSON for Modern C++      
     
     
      
     
      
     
     
     
     
      
     
     
     
     
     
      
     
     
     
     
           
    JSON Patch and Diff
     
    Patches
     
    JSON Patch (RFC 6902) defines a JSON document structure for expressing a sequence of operations to apply to a JSON document. With the patch function, a JSON Patch is applied to the current JSON value by executing all operations from the patch.
     
     Example 
    The following code shows how a JSON patch is applied to a value.
     
    #include <iostream>
 #include <iomanip>
 #include <nlohmann/json.hpp>
 
@@ -105,4 +105,4 @@
         "world"
     ]
 }
-
     
       
     
       
      
     
     
     
     
     
     Copyright © 2013-2025 Niels Lohmann 
     
     
                 
     
     
     
     
     
     
     
         
\ No newline at end of file
+
    Copyright © 2013-2025 Niels Lohmann
    \ No newline at end of file diff --git a/features/json_pointer/index.html b/features/json_pointer/index.html index bacde60a0..59a569ca1 100644 --- a/features/json_pointer/index.html +++ b/features/json_pointer/index.html @@ -1,4 +1,4 @@ - JSON Pointer - JSON for Modern C++

    JSON Pointer

    Introduction

    The library supports JSON Pointer (RFC 6901) as an alternative means to address structured values. A JSON Pointer is a string that identifies a specific value within a JSON document.

    Consider the following JSON document

    {
+ JSON Pointer - JSON for Modern C++      
     
     
      
     
      
     
     
     
     
      
     
     
     
     
     
      
     
     
     
     
           
    JSON Pointer
     
    Introduction
     
    The library supports JSON Pointer (RFC 6901) as an alternative means to address structured values. A JSON Pointer is a string that identifies a specific value within a JSON document.
     
    Consider the following JSON document
     
    {
     "array": ["A", "B", "C"],
     "nested": {
         "one": 1,
@@ -45,4 +45,4 @@
   "/nested/three/1": false
 }
 
     
    The reverse function, unflatten recreates the original value.
     
    auto j_original = j_flat.unflatten();
-
     
    See also
        
     
       
      
     
     
     
     
     
     Copyright © 2013-2025 Niels Lohmann 
     
     
                 
     
     
     
     
     
     
     
         
\ No newline at end of file
+

    See also

    Copyright © 2013-2025 Niels Lohmann
    \ No newline at end of file diff --git a/features/macros/index.html b/features/macros/index.html index 1d00dc4a0..4506e65c8 100644 --- a/features/macros/index.html +++ b/features/macros/index.html @@ -1 +1 @@ - Supported Macros - JSON for Modern C++

    Supported Macros

    Some aspects of the library can be configured by defining preprocessor macros before including the json.hpp header. See also the API documentation for macros for examples and more information.

    JSON_ASSERT(x)

    This macro controls which code is executed for runtime assertions of the library.

    See full documentation of JSON_ASSERT(x).

    JSON_CATCH_USER(exception)

    This macro overrides catch calls inside the library.

    See full documentation of JSON_CATCH_USER(exception).

    JSON_DIAGNOSTICS

    This macro enables extended diagnostics for exception messages. Possible values are 1 to enable or 0 to disable (default).

    When enabled, exception messages contain a JSON Pointer to the JSON value that triggered the exception, see Extended diagnostic messages for an example. Note that enabling this macro increases the size of every JSON value by one pointer and adds some runtime overhead.

    The diagnostics messages can also be controlled with the CMake option JSON_Diagnostics (OFF by default) which sets JSON_DIAGNOSTICS accordingly.

    See full documentation of JSON_DIAGNOSTICS.

    JSON_DIAGNOSTIC_POSITIONS

    When enabled, two new member functions start_pos() and end_pos() are added to basic_json values. If the value was created by calling theparse function, then these functions allow querying the byte positions of the value in the input it was parsed from. The byte positions are also used in exceptions to help locate errors.

    The diagnostics positions can also be controlled with the CMake option JSON_Diagnostic_Positions (OFF by default) which sets JSON_DIAGNOSTIC_POSITIONS accordingly.

    See full documentation of JSON_DIAGNOSTIC_POSITIONS

    JSON_HAS_CPP_11, JSON_HAS_CPP_14, JSON_HAS_CPP_17, JSON_HAS_CPP_20

    The library targets C++11, but also supports some features introduced in later C++ versions (e.g., std::string_view support for C++17). For these new features, the library implements some preprocessor checks to determine the C++ standard. By defining any of these symbols, the internal check is overridden and the provided C++ version is unconditionally assumed. This can be helpful for compilers that only implement parts of the standard and would be detected incorrectly.

    See full documentation of JSON_HAS_CPP_11, JSON_HAS_CPP_14, JSON_HAS_CPP_17, and JSON_HAS_CPP_20.

    JSON_HAS_FILESYSTEM, JSON_HAS_EXPERIMENTAL_FILESYSTEM

    When compiling with C++17, the library provides conversions from and to std::filesystem::path. As compiler support for filesystem is limited, the library tries to detect whether <filesystem>/std::filesystem (JSON_HAS_FILESYSTEM) or <experimental/filesystem>/std::experimental::filesystem (JSON_HAS_EXPERIMENTAL_FILESYSTEM) should be used. To override the built-in check, define JSON_HAS_FILESYSTEM or JSON_HAS_EXPERIMENTAL_FILESYSTEM to 1.

    See full documentation of JSON_HAS_FILESYSTEM and JSON_HAS_EXPERIMENTAL_FILESYSTEM.

    JSON_NOEXCEPTION

    Exceptions can be switched off by defining the symbol JSON_NOEXCEPTION.

    See full documentation of JSON_NOEXCEPTION.

    JSON_DISABLE_ENUM_SERIALIZATION

    When defined, default parse and serialize functions for enums are excluded and have to be provided by the user, for example, using NLOHMANN_JSON_SERIALIZE_ENUM.

    See full documentation of JSON_DISABLE_ENUM_SERIALIZATION.

    JSON_NO_IO

    When defined, headers <cstdio>, <ios>, <iosfwd>, <istream>, and <ostream> are not included and parse functions relying on these headers are excluded. This is relevant for environment where these I/O functions are disallowed for security reasons (e.g., Intel Software Guard Extensions (SGX)).

    See full documentation of JSON_NO_IO.

    JSON_SKIP_LIBRARY_VERSION_CHECK

    When defined, the library will not create a compiler warning when a different version of the library was already included.

    See full documentation of JSON_SKIP_LIBRARY_VERSION_CHECK.

    JSON_SKIP_UNSUPPORTED_COMPILER_CHECK

    When defined, the library will not create a compile error when a known unsupported compiler is detected. This allows using the library with compilers that do not fully support C++11 and may only work if unsupported features are not used.

    See full documentation of JSON_SKIP_UNSUPPORTED_COMPILER_CHECK.

    JSON_THROW_USER(exception)

    This macro overrides throw calls inside the library. The argument is the exception to be thrown.

    See full documentation of JSON_THROW_USER(exception).

    JSON_TRY_USER

    This macro overrides try calls inside the library.

    See full documentation of JSON_TRY_USER.

    JSON_USE_IMPLICIT_CONVERSIONS

    When defined to 0, implicit conversions are switched off. By default, implicit conversions are switched on.

    See full documentation of JSON_USE_IMPLICIT_CONVERSIONS.

    NLOHMANN_DEFINE_TYPE_*(...), NLOHMANN_DEFINE_DERIVED_TYPE_*(...)

    The library defines 12 macros to simplify the serialization/deserialization of types. See the page on arbitrary type conversion for a detailed discussion.

    NLOHMANN_JSON_SERIALIZE_ENUM(type, ...)

    This macro simplifies the serialization/deserialization of enum types. See Specializing enum conversion for more information.

    See full documentation of NLOHMANN_JSON_SERIALIZE_ENUM.

    NLOHMANN_JSON_VERSION_MAJOR, NLOHMANN_JSON_VERSION_MINOR, NLOHMANN_JSON_VERSION_PATCH

    These macros are defined by the library and contain the version numbers according to Semantic Versioning 2.0.0.

    See full documentation of NLOHMANN_JSON_VERSION_MAJOR, NLOHMANN_JSON_VERSION_MINOR, and NLOHMANN_JSON_VERSION_PATCH.

    Copyright © 2013-2025 Niels Lohmann
    \ No newline at end of file + Supported Macros - JSON for Modern C++

    Supported Macros

    Some aspects of the library can be configured by defining preprocessor macros before including the json.hpp header. See also the API documentation for macros for examples and more information.

    JSON_ASSERT(x)

    This macro controls which code is executed for runtime assertions of the library.

    See full documentation of JSON_ASSERT(x).

    JSON_CATCH_USER(exception)

    This macro overrides catch calls inside the library.

    See full documentation of JSON_CATCH_USER(exception).

    JSON_DIAGNOSTICS

    This macro enables extended diagnostics for exception messages. Possible values are 1 to enable or 0 to disable (default).

    When enabled, exception messages contain a JSON Pointer to the JSON value that triggered the exception, see Extended diagnostic messages for an example. Note that enabling this macro increases the size of every JSON value by one pointer and adds some runtime overhead.

    The diagnostics messages can also be controlled with the CMake option JSON_Diagnostics (OFF by default) which sets JSON_DIAGNOSTICS accordingly.

    See full documentation of JSON_DIAGNOSTICS.

    JSON_DIAGNOSTIC_POSITIONS

    When enabled, two new member functions start_pos() and end_pos() are added to basic_json values. If the value was created by calling theparse function, then these functions allow querying the byte positions of the value in the input it was parsed from. The byte positions are also used in exceptions to help locate errors.

    The diagnostics positions can also be controlled with the CMake option JSON_Diagnostic_Positions (OFF by default) which sets JSON_DIAGNOSTIC_POSITIONS accordingly.

    See full documentation of JSON_DIAGNOSTIC_POSITIONS

    JSON_HAS_CPP_11, JSON_HAS_CPP_14, JSON_HAS_CPP_17, JSON_HAS_CPP_20

    The library targets C++11, but also supports some features introduced in later C++ versions (e.g., std::string_view support for C++17). For these new features, the library implements some preprocessor checks to determine the C++ standard. By defining any of these symbols, the internal check is overridden and the provided C++ version is unconditionally assumed. This can be helpful for compilers that only implement parts of the standard and would be detected incorrectly.

    See full documentation of JSON_HAS_CPP_11, JSON_HAS_CPP_14, JSON_HAS_CPP_17, and JSON_HAS_CPP_20.

    JSON_HAS_FILESYSTEM, JSON_HAS_EXPERIMENTAL_FILESYSTEM

    When compiling with C++17, the library provides conversions from and to std::filesystem::path. As compiler support for filesystem is limited, the library tries to detect whether <filesystem>/std::filesystem (JSON_HAS_FILESYSTEM) or <experimental/filesystem>/std::experimental::filesystem (JSON_HAS_EXPERIMENTAL_FILESYSTEM) should be used. To override the built-in check, define JSON_HAS_FILESYSTEM or JSON_HAS_EXPERIMENTAL_FILESYSTEM to 1.

    See full documentation of JSON_HAS_FILESYSTEM and JSON_HAS_EXPERIMENTAL_FILESYSTEM.

    JSON_NOEXCEPTION

    Exceptions can be switched off by defining the symbol JSON_NOEXCEPTION.

    See full documentation of JSON_NOEXCEPTION.

    JSON_DISABLE_ENUM_SERIALIZATION

    When defined, default parse and serialize functions for enums are excluded and have to be provided by the user, for example, using NLOHMANN_JSON_SERIALIZE_ENUM.

    See full documentation of JSON_DISABLE_ENUM_SERIALIZATION.

    JSON_NO_IO

    When defined, headers <cstdio>, <ios>, <iosfwd>, <istream>, and <ostream> are not included and parse functions relying on these headers are excluded. This is relevant for environment where these I/O functions are disallowed for security reasons (e.g., Intel Software Guard Extensions (SGX)).

    See full documentation of JSON_NO_IO.

    JSON_SKIP_LIBRARY_VERSION_CHECK

    When defined, the library will not create a compiler warning when a different version of the library was already included.

    See full documentation of JSON_SKIP_LIBRARY_VERSION_CHECK.

    JSON_SKIP_UNSUPPORTED_COMPILER_CHECK

    When defined, the library will not create a compile error when a known unsupported compiler is detected. This allows using the library with compilers that do not fully support C++11 and may only work if unsupported features are not used.

    See full documentation of JSON_SKIP_UNSUPPORTED_COMPILER_CHECK.

    JSON_THROW_USER(exception)

    This macro overrides throw calls inside the library. The argument is the exception to be thrown.

    See full documentation of JSON_THROW_USER(exception).

    JSON_TRY_USER

    This macro overrides try calls inside the library.

    See full documentation of JSON_TRY_USER.

    JSON_USE_IMPLICIT_CONVERSIONS

    When defined to 0, implicit conversions are switched off. By default, implicit conversions are switched on.

    See full documentation of JSON_USE_IMPLICIT_CONVERSIONS.

    NLOHMANN_DEFINE_TYPE_*(...), NLOHMANN_DEFINE_DERIVED_TYPE_*(...)

    The library defines 12 macros to simplify the serialization/deserialization of types. See the page on arbitrary type conversion for a detailed discussion.

    NLOHMANN_JSON_SERIALIZE_ENUM(type, ...)

    This macro simplifies the serialization/deserialization of enum types. See Specializing enum conversion for more information.

    See full documentation of NLOHMANN_JSON_SERIALIZE_ENUM.

    NLOHMANN_JSON_VERSION_MAJOR, NLOHMANN_JSON_VERSION_MINOR, NLOHMANN_JSON_VERSION_PATCH

    These macros are defined by the library and contain the version numbers according to Semantic Versioning 2.0.0.

    See full documentation of NLOHMANN_JSON_VERSION_MAJOR, NLOHMANN_JSON_VERSION_MINOR, and NLOHMANN_JSON_VERSION_PATCH.

    Copyright © 2013-2025 Niels Lohmann
    \ No newline at end of file diff --git a/features/merge_patch/index.html b/features/merge_patch/index.html index c999056eb..664374eaf 100644 --- a/features/merge_patch/index.html +++ b/features/merge_patch/index.html @@ -1,4 +1,4 @@ - JSON Merge Patch - JSON for Modern C++

    JSON Merge Patch

    The library supports JSON Merge Patch (RFC 7386) as a patch format. The merge patch format is primarily intended for use with the HTTP PATCH method as a means of describing a set of modifications to a target resource's content. This function applies a merge patch to the current JSON value.

    Instead of using JSON Pointer to specify values to be manipulated, it describes the changes using a syntax that closely mimics the document being modified.

    Example

    The following code shows how a JSON Merge Patch is applied to a JSON document.

    #include <iostream>
+ JSON Merge Patch - JSON for Modern C++      
     
     
      
     
      
     
     
     
     
      
     
     
     
     
     
      
     
     
     
     
           
    JSON Merge Patch
     
    The library supports JSON Merge Patch (RFC 7386) as a patch format. The merge patch format is primarily intended for use with the HTTP PATCH method as a means of describing a set of modifications to a target resource's content. This function applies a merge patch to the current JSON value.
     
    Instead of using JSON Pointer to specify values to be manipulated, it describes the changes using a syntax that closely mimics the document being modified.
     
     Example 
    The following code shows how a JSON Merge Patch is applied to a JSON document.
     
    #include <iostream>
 #include <nlohmann/json.hpp>
 #include <iomanip> // for std::setw
 
@@ -50,4 +50,4 @@
     ],
     "title": "Hello!"
 }
-
     
       
     
       
      
     
     
     
     
     
     Copyright © 2013-2025 Niels Lohmann 
     
     
                 
     
     
     
     
     
     
     
         
\ No newline at end of file
+
    Copyright © 2013-2025 Niels Lohmann
    \ No newline at end of file diff --git a/features/modules/index.html b/features/modules/index.html new file mode 100644 index 000000000..4863d840b --- /dev/null +++ b/features/modules/index.html @@ -0,0 +1,10 @@ + Modules - JSON for Modern C++

    Modules

    This library has experimental support for C++ modules, introduced in C++20. The library can be imported by writing import nlohmann.json; instead of #include <nlohmann/json.hpp>.

    Please be aware that the module is experimental and a full test is outstanding, and the exported symbols are subject to change.

    Requirements

    The nlohmann.json module requires that the build system is configured to build and resolve modules when imported. Obviously, as modules were introduced in C++20, this feature can only be used in C++20 and subsequent versions.

    To enable building the nlohmann.json module (which is not done by default), the macro NLOHMANN_JSON_BUILD_MODULES must be passed to the build system.

    Example

    When using modules rather than headers, the previous example for creating a json object through a JSON file, would instead be: 

    import std;
+import nlohmann.json;
+
+using json = nlohmann::json;
+
+// ...
+
+std::ifstream f("example.json");
+json data = json::parse(f);
+

    Modules do not export macros

    It should be noted that as modules do not export macros, the nlohmann.json module will not export any macros, but rather only the following symbols: - nlohmann::adl_serializer - nlohmann::basic_json - nlohmann::json - nlohmann::json_pointer - nlohmann::ordered_map - nlohmann::ordered_json

    Copyright © 2013-2025 Niels Lohmann
    \ No newline at end of file diff --git a/features/namespace/index.html b/features/namespace/index.html index 9bf730212..0f23e4287 100644 --- a/features/namespace/index.html +++ b/features/namespace/index.html @@ -1,4 +1,4 @@ - nlohmann Namespace - JSON for Modern C++

    nlohmann Namespace

    The 3.11.0 release introduced an inline namespace to allow different parts of a codebase to safely use different versions of the JSON library as long as they never exchange instances of library types.

    Structure

    The complete default namespace name is derived as follows:

    • The root namespace is always nlohmann.
    • The inline namespace starts with json_abi and is followed by serveral optional ABI tags according to the value of these ABI-affecting macros, in order:
    • The inline namespace ends with the suffix _v followed by the 3 components of the version number separated by underscores. To omit the version component, see Disabling the version component below.

    For example, the namespace name for version 3.11.2 with JSON_DIAGNOSTICS defined to 1 is:

    nlohmann::json_abi_diag_v3_11_2
+ nlohmann Namespace - JSON for Modern C++      
     
     
      
     
      
     
     
     
     
      
     
     
     
     
     
      
     
     
     
     
           
    nlohmann Namespace
     
    The 3.11.0 release introduced an inline namespace to allow different parts of a codebase to safely use different versions of the JSON library as long as they never exchange instances of library types.
     
    Structure
     
    The complete default namespace name is derived as follows:
     
       
    • The root namespace is always nlohmann.
      •  
    • The inline namespace starts with json_abi and is followed by serveral optional ABI tags according to the value of these ABI-affecting macros, in order: 
      •  
    • The inline namespace ends with the suffix _v followed by the 3 components of the version number separated by underscores. To omit the version component, see Disabling the version component below.
      •  
     
    For example, the namespace name for version 3.11.2 with JSON_DIAGNOSTICS defined to 1 is:
     
    nlohmann::json_abi_diag_v3_11_2
 
     
    Purpose
     
    Several incompatibilities have been observed. Amongst the most common ones is linking code compiled with different definitions of JSON_DIAGNOSTICS. This is illustrated in the diagram below.
     
    graph
     json["<strong>nlohmann_json (v3.10.5)</strong><br>JSON_DIAGNOSTICS=0"]
     json_diag["<strong>nlohmann_json (v3.10.5)</strong><br>JSON_DIAGNOSTICS=1"]
@@ -9,4 +9,4 @@
     app --> json_diag
     app --> library
     
    In releases prior to 3.11.0, mixing any version of the JSON library with different JSON_DIAGNOSTICS settings would result in a crashing application. If some_library never passes instances of JSON library types to the application, this scenario became safe in version 3.11.0 and above due to the inline namespace yielding distinct symbol names.
     
    Limitations
     
    Neither the compiler nor the linker will issue as much as a warning when translation units – intended to be linked together and that include different versions and/or configurations of the JSON library – exchange and use library types.
     
    There is an exception when forward declarations are used (i.e., when including json_fwd.hpp) in which case the linker may complain about undefined references.
     
    Disabling the version component
     
    Different versions are not necessarily ABI-incompatible, but the project does not actively track changes in the ABI and recommends that all parts of a codebase exchanging library types be built with the same version. Users can, at their own risk, disable the version component of the linline namespace, allowing different versions – but not configurations – to be used in cases where the linker would otherwise output undefined reference errors.
     
    To do so, define NLOHMANN_JSON_NAMESPACE_NO_VERSION to 1.
     
    This applies to version 3.11.2 and above only; versions 3.11.0 and 3.11.1 can apply the technique described in the next section to emulate the effect of the NLOHMANN_JSON_NAMESPACE_NO_VERSION macro.
     
     
    Use at your own risk
     
    Disabling the namespace version component and mixing ABI-incompatible versions will result in crashes or incorrect behavior. You have been warned!
     
     
    Disabling the inline namespace completely
     
    When interoperability with code using a pre-3.11.0 version of the library is required, users can, at their own risk restore the old namespace layout by redefining NLOHMANN_JSON_NAMESPACE_BEGIN, NLOHMANN_JSON_NAMESPACE_END as follows:
     
    #define NLOHMANN_JSON_NAMESPACE_BEGIN  namespace nlohmann {
 #define NLOHMANN_JSON_NAMESPACE_END    }
-
     
     
    Use at your own risk
     
    Overriding the namespace and mixing ABI-incompatible versions will result in crashes or incorrect behavior. You have been warned!
     
     
    Version history
     
       
    • Introduced inline namespace (json_v3_11_0[_abi-tag]*) in version 3.11.0.
      •  
    • Changed structure of inline namespace in version 3.11.2.
      •  
       
     
       
      
     
     
     
     
     
     Copyright © 2013-2025 Niels Lohmann 
     
     
                 
     
     
     
     
     
     
     
         
\ No newline at end of file
+

    Use at your own risk

    Overriding the namespace and mixing ABI-incompatible versions will result in crashes or incorrect behavior. You have been warned!

    Version history

    • Introduced inline namespace (json_v3_11_0[_abi-tag]*) in version 3.11.0.
    • Changed structure of inline namespace in version 3.11.2.
    Copyright © 2013-2025 Niels Lohmann
    \ No newline at end of file diff --git a/features/object_order/index.html b/features/object_order/index.html index 1573de765..01a6957b0 100644 --- a/features/object_order/index.html +++ b/features/object_order/index.html @@ -1,4 +1,4 @@ - Object Order - JSON for Modern C++

    Object Order

    The JSON standard defines objects as "an unordered collection of zero or more name/value pairs". As such, an implementation does not need to preserve any specific order of object keys.

    Default behavior: sort keys

    The default type nlohmann::json uses a std::map to store JSON objects, and thus stores object keys sorted alphabetically.

    Example 
    #include <iostream>
+ Object Order - JSON for Modern C++      
     
     
      
     
      
     
     
     
     
      
     
     
     
     
     
      
     
     
     
     
           
    Object Order
     
    The JSON standard defines objects as "an unordered collection of zero or more name/value pairs". As such, an implementation does not need to preserve any specific order of object keys.
     
    Default behavior: sort keys
     
    The default type nlohmann::json uses a std::map to store JSON objects, and thus stores object keys sorted alphabetically.
     
     Example 
    #include <iostream>
 #include "json.hpp"
 
 using json = nlohmann::json;
@@ -57,4 +57,4 @@
   "three": 3
   "two": 2,
 }
-
     
       
     
       
      
     
     
     
     
     
     Copyright © 2013-2025 Niels Lohmann 
     
     
                 
     
     
     
     
     
     
     
         
\ No newline at end of file
+
    Copyright © 2013-2025 Niels Lohmann
    \ No newline at end of file diff --git a/features/parsing/index.html b/features/parsing/index.html index af6b52fe6..fdf27116f 100644 --- a/features/parsing/index.html +++ b/features/parsing/index.html @@ -1 +1 @@ - Parsing - JSON for Modern C++
    Copyright © 2013-2025 Niels Lohmann
    \ No newline at end of file + Parsing - JSON for Modern C++
    Copyright © 2013-2025 Niels Lohmann
    \ No newline at end of file diff --git a/features/parsing/json_lines/index.html b/features/parsing/json_lines/index.html index 2183a3ca7..af79afc1f 100644 --- a/features/parsing/json_lines/index.html +++ b/features/parsing/json_lines/index.html @@ -1,4 +1,4 @@ - JSON Lines - JSON for Modern C++

    JSON Lines

    The JSON Lines format is a text format of newline-delimited JSON. In particular:

    1. The input must be UTF-8 encoded.
    2. Every line must be a valid JSON value.
    3. The line separator must be \n. As \r is silently ignored, \r\n is also supported.
    4. The final character may be \n, but is not required to be one.

    JSON Text example

    {"name": "Gilbert", "wins": [["straight", "7♣"], ["one pair", "10♥"]]}
+ JSON Lines - JSON for Modern C++      
     
     
      
     
      
     
     
     
     
      
     
     
     
     
     
      
     
     
     
     
           
    JSON Lines
     
    The JSON Lines format is a text format of newline-delimited JSON. In particular:
     
       
    1. The input must be UTF-8 encoded.
      2.  
    2. Every line must be a valid JSON value.
      3.  
    3. The line separator must be \n. As \r is silently ignored, \r\n is also supported.
      4.  
    4. The final character may be \n, but is not required to be one.
      5.  
     
     
    JSON Text example
     
    {"name": "Gilbert", "wins": [["straight", "7♣"], ["one pair", "10♥"]]}
 {"name": "Alexa", "wins": [["two pair", "4♠"], ["two pair", "9♠"]]}
 {"name": "May", "wins": []}
 {"name": "Deloise", "wins": [["three of a kind", "5♣"]]}
@@ -33,4 +33,4 @@
 {
     std::cout << j << std::endl;
 }
-
     
    with a JSON Lines input does not work, because the parser will try to parse one value after the last one.
     
       
     
       
      
     
     
     
     
     
     Copyright © 2013-2025 Niels Lohmann 
     
     
                 
     
     
     
     
     
     
     
         
\ No newline at end of file
+

    with a JSON Lines input does not work, because the parser will try to parse one value after the last one.

    Copyright © 2013-2025 Niels Lohmann
    \ No newline at end of file diff --git a/features/parsing/parse_exceptions/index.html b/features/parsing/parse_exceptions/index.html index e71ca79d2..9e4059241 100644 --- a/features/parsing/parse_exceptions/index.html +++ b/features/parsing/parse_exceptions/index.html @@ -1,4 +1,4 @@ - Parsing and Exceptions - JSON for Modern C++

    Parsing and Exceptions

    When the input is not valid JSON, an exception of type parse_error is thrown. This exception contains the position in the input where the error occurred, together with a diagnostic message and the last read input token. The exceptions page contains a list of examples for parse error exceptions. In case you process untrusted input, always enclose your code with a try/catch block, like

    json j;
+ Parsing and Exceptions - JSON for Modern C++      
     
     
      
     
      
     
     
     
     
      
     
     
     
     
     
      
     
     
     
     
           
    Parsing and Exceptions
     
    When the input is not valid JSON, an exception of type parse_error is thrown. This exception contains the position in the input where the error occurred, together with a diagnostic message and the last read input token. The exceptions page contains a list of examples for parse error exceptions. In case you process untrusted input, always enclose your code with a try/catch block, like
     
    json j;
 try
 {
     j = json::parse(my_input);
@@ -63,4 +63,4 @@
 last read: "3,]"
 parsing unsuccessful!
 parsed value: [1,2,3]
-
        
     
       
      
     
     
     
     
     
     Copyright © 2013-2025 Niels Lohmann 
     
     
                 
     
     
     
     
     
     
     
         
\ No newline at end of file
+
    Copyright © 2013-2025 Niels Lohmann
    \ No newline at end of file diff --git a/features/parsing/parser_callbacks/index.html b/features/parsing/parser_callbacks/index.html index 521f624d0..33b83f90f 100644 --- a/features/parsing/parser_callbacks/index.html +++ b/features/parsing/parser_callbacks/index.html @@ -1,4 +1,4 @@ - Parser Callbacks - JSON for Modern C++

    Parser Callbacks

    Overview

    With a parser callback function, the result of parsing a JSON text can be influenced. When passed to parse, it is called on certain events (passed as parse_event_t via parameter event) with a set recursion depth depth and context JSON value parsed. The return value of the callback function is a boolean indicating whether the element that emitted the callback shall be kept or not.

    The type of the callback function is:

    template<typename BasicJsonType>
+ Parser Callbacks - JSON for Modern C++      
     
     
      
     
      
     
     
     
     
      
     
     
     
     
     
      
     
     
     
     
           
    Parser Callbacks
     
    Overview
     
    With a parser callback function, the result of parsing a JSON text can be influenced. When passed to parse, it is called on certain events (passed as parse_event_t via parameter event) with a set recursion depth depth and context JSON value parsed. The return value of the callback function is a boolean indicating whether the element that emitted the callback shall be kept or not.
     
    The type of the callback function is:
     
    template<typename BasicJsonType>
 using parser_callback_t =
     std::function<bool(int depth, parse_event_t event, BasicJsonType& parsed)>;
 
     
    Callback event types
     
    We distinguish six scenarios (determined by the event type) in which the callback function can be called. The following table describes the values of the parameters depth, event, and parsed.
     
      
     parameter event description parameter depth parameter parsed 
           
     parse_event_t::object_start the parser read { and started to process a JSON object depth of the parent of the JSON object a JSON value with type discarded 
     
     parse_event_t::key the parser read a key of a value in an object depth of the currently parsed JSON object a JSON string containing the key 
     
     parse_event_t::object_end the parser read } and finished processing a JSON object depth of the parent of the JSON object the parsed JSON object 
     
     parse_event_t::array_start the parser read [ and started to process a JSON array depth of the parent of the JSON array a JSON value with type discarded 
     
     parse_event_t::array_end the parser read ] and finished processing a JSON array depth of the parent of the JSON array the parsed JSON array 
     
     parse_event_t::value the parser finished reading a JSON value depth of the value the parsed JSON value 
          
     
     Example 
    When parsing the following JSON text,
     
    {
@@ -90,4 +90,4 @@
         "Width": 800
     }
 }
-
     
       
     
       
      
     
     
     
     
     
     Copyright © 2013-2025 Niels Lohmann 
     
     
                 
     
     
     
     
     
     
     
         
\ No newline at end of file
+
    Copyright © 2013-2025 Niels Lohmann
    \ No newline at end of file diff --git a/features/parsing/sax_interface/index.html b/features/parsing/sax_interface/index.html index 08b4ae448..c8901b736 100644 --- a/features/parsing/sax_interface/index.html +++ b/features/parsing/sax_interface/index.html @@ -1,4 +1,4 @@ - SAX Interface - JSON for Modern C++

    SAX Interface

    The library uses a SAX-like interface with the following functions:

    classDiagram
+ SAX Interface - JSON for Modern C++      
     
     
      
     
      
     
     
     
     
      
     
     
     
     
     
      
     
     
     
     
           
    SAX Interface
     
    The library uses a SAX-like interface with the following functions:
     
    classDiagram
 
 class sax_t ["json::sax_t"] {
     <<interface>>
@@ -49,4 +49,4 @@ class sax_t ["json::sax_t"] {
 
 // called when a parse error occurs; byte position, the last token, and an exception is passed
 bool parse_error(std::size_t position, const std::string& last_token, const json::exception& ex);
-
     
    The return value of each function determines whether parsing should proceed.
     
    To implement your own SAX handler, proceed as follows:
     
       
    1. Implement the SAX interface in a class. You can use class nlohmann::json_sax<json> as base class, but you can also use any class where the functions described above are implemented and public.
      2.  
    2. Create an object of your SAX interface class, e.g. my_sax.
      3.  
    3. Call bool json::sax_parse(input, &my_sax); where the first parameter can be any input like a string or an input stream and the second parameter is a pointer to your SAX interface.
      4.  
     
    Note the sax_parse function only returns a bool indicating the result of the last executed SAX event. It does not return json value - it is up to you to decide what to do with the SAX events. Furthermore, no exceptions are thrown in case of a parse error - it is up to you what to do with the exception object passed to your parse_error implementation. Internally, the SAX interface is used for the DOM parser (class json_sax_dom_parser) as well as the acceptor (json_sax_acceptor), see file json_sax.hpp.
     
    See also
    Copyright © 2013-2025 Niels Lohmann
    \ No newline at end of file +

    The return value of each function determines whether parsing should proceed.

    To implement your own SAX handler, proceed as follows:

    1. Implement the SAX interface in a class. You can use class nlohmann::json_sax<json> as base class, but you can also use any class where the functions described above are implemented and public.
    2. Create an object of your SAX interface class, e.g. my_sax.
    3. Call bool json::sax_parse(input, &my_sax); where the first parameter can be any input like a string or an input stream and the second parameter is a pointer to your SAX interface.

    Note the sax_parse function only returns a bool indicating the result of the last executed SAX event. It does not return json value - it is up to you to decide what to do with the SAX events. Furthermore, no exceptions are thrown in case of a parse error - it is up to you what to do with the exception object passed to your parse_error implementation. Internally, the SAX interface is used for the DOM parser (class json_sax_dom_parser) as well as the acceptor (json_sax_acceptor), see file json_sax.hpp.

    See also

    Copyright © 2013-2025 Niels Lohmann
    \ No newline at end of file diff --git a/features/trailing_commas/index.html b/features/trailing_commas/index.html index 1a5d5f887..09282fdf7 100644 --- a/features/trailing_commas/index.html +++ b/features/trailing_commas/index.html @@ -1,4 +1,4 @@ - Trailing Commas - JSON for Modern C++

    Trailing Commas

    Like comments, this library does not support trailing commas in arrays and objects by default.

    You can set parameter ignore_trailing_commas to true in the parse function to allow trailing commas in arrays and objects. Note that a single comma as the only content of the array or object ([,] or {,}) is not allowed, and multiple trailing commas ([1,,]) are not allowed either.

    This library does not add trailing commas when serializing JSON data.

    For more information, see JSON With Commas and Comments (JWCC).

    Example

    Consider the following JSON with trailing commas.

    {
+ Trailing Commas - JSON for Modern C++      
     
     
      
     
      
     
     
     
     
      
     
     
     
     
     
      
     
     
     
     
           
    Trailing Commas
     
    Like comments, this library does not support trailing commas in arrays and objects by default.
     
    You can set parameter ignore_trailing_commas to true in the parse function to allow trailing commas in arrays and objects. Note that a single comma as the only content of the array or object ([,] or {,}) is not allowed, and multiple trailing commas ([1,,]) are not allowed either.
     
    This library does not add trailing commas when serializing JSON data.
     
    For more information, see JSON With Commas and Comments (JWCC).
     
     
    Example
     
    Consider the following JSON with trailing commas.
     
    {
     "planets": [
         "Mercury",
         "Venus",
@@ -58,4 +58,4 @@
     "Neptune"
   ]
 }
-
     
       
     
       
      
     
     
     
     
     
     Copyright © 2013-2025 Niels Lohmann 
     
     
                 
     
     
     
     
     
     
     
         
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    Copyright © 2013-2025 Niels Lohmann
    \ No newline at end of file diff --git a/features/types/index.html b/features/types/index.html index bc16f36cc..366ea5b3e 100644 --- a/features/types/index.html +++ b/features/types/index.html @@ -1,4 +1,4 @@ - Types - JSON for Modern C++

    Types

    This page gives an overview of how JSON values are stored and how this can be configured.

    Overview

    By default, JSON values are stored as follows:

    JSON type C++ type
    object std::map<std::string, basic_json>
    array std::vector<basic_json>
    null std::nullptr_t
    string std::string
    boolean bool
    number std::int64_t, std::uint64_t, and double

    Note there are three different types for numbers - when parsing JSON text, the best fitting type is chosen.

    Storage

    classDiagram
+ Types - JSON for Modern C++      
     
     
      
     
      
     
     
     
     
      
     
     
     
     
     
      
     
     
     
     
           
    Types
     
    This page gives an overview of how JSON values are stored and how this can be configured.
     
    Overview
     
    By default, JSON values are stored as follows:
     
      
     JSON type C++ type 
           
     object std::map<std::string, basic_json> 
     
     array std::vector<basic_json> 
     
     null std::nullptr_t 
     
     string std::string 
     
     boolean bool 
     
     number std::int64_t, std::uint64_t, and double 
          
     
    Note there are three different types for numbers - when parsing JSON text, the best fitting type is chosen.
     
    Storage
     
    classDiagram
 
 class value_t {
     <<enumeration>>
@@ -77,4 +77,4 @@ basic_json .. value_t
     
    Template arguments<
   basic_json, // value_type
   std::allocator<basic_json> // allocator_type
 >
-

    Limits

    RFC 8259 specifies:

    An implementation may set limits on the maximum depth of nesting.

    In this class, the array's limit of nesting is not explicitly constrained. However, a maximum depth of nesting may be introduced by the compiler or runtime environment. A theoretical limit can be queried by calling the max_size function of a JSON array.

    Storage

    Arrays are stored as pointers in a basic_json type. That is, for any access to array values, a pointer of type array_t* must be dereferenced.

    Strings

    RFC 8259 describes JSON strings as follows:

    A string is a sequence of zero or more Unicode characters.

    Unicode values are split by the JSON class into byte-sized characters during deserialization.

    Default type

    With the default values for StringType (std::string), the default value for string_t is std::string.

    Encoding

    Strings are stored in UTF-8 encoding. Therefore, functions like std::string::size() or std::string::length() return the number of bytes in the string rather than the number of characters or glyphs.

    String comparison

    RFC 8259 states:

    Software implementations are typically required to test names of object members for equality. Implementations that transform the textual representation into sequences of Unicode code units and then perform the comparison numerically, code unit by code unit are interoperable in the sense that implementations will agree in all cases on equality or inequality of two strings. For example, implementations that compare strings with escaped characters unconverted may incorrectly find that "a\\b" and "a\u005Cb" are not equal.

    This implementation is interoperable as it does compare strings code unit by code unit.

    Storage

    String values are stored as pointers in a basic_json type. That is, for any access to string values, a pointer of type string_t* must be dereferenced.

    Booleans

    RFC 8259 implicitly describes a boolean as a type which differentiates the two literals true and false.

    Default type

    With the default values for BooleanType (bool), the default value for boolean_t is bool.

    Storage

    Boolean values are stored directly inside a basic_json type.

    Numbers

    See the number handling article for a detailed discussion on how numbers are handled by this library.

    RFC 8259 describes numbers as follows:

    The representation of numbers is similar to that used in most programming languages. A number is represented in base 10 using decimal digits. It contains an integer component that may be prefixed with an optional minus sign, which may be followed by a fraction part and/or an exponent part. Leading zeros are not allowed. (...) Numeric values that cannot be represented in the grammar below (such as Infinity and NaN) are not permitted.

    This description includes both integer and floating-point numbers. However, C++ allows more precise storage if it is known whether the number is a signed integer, an unsigned integer, or a floating-point number. Therefore, three different types, number_integer_t, number_unsigned_t, and number_float_t are used.

    Default types

    With the default values for NumberIntegerType (std::int64_t), the default value for number_integer_t is std::int64_t. With the default values for NumberUnsignedType (std::uint64_t), the default value for number_unsigned_t is std::uint64_t. With the default values for NumberFloatType (double), the default value for number_float_t is double.

    Default behavior

    • The restrictions about leading zeros are not enforced in C++. Instead, leading zeros in integer literals lead to an interpretation as an octal number. Internally, the value will be stored as a decimal number. For instance, the C++ integer literal 010 will be serialized to 8. During deserialization, leading zeros yield an error.
    • Not-a-number (NaN) values will be serialized to null.

    Limits

    RFC 8259 specifies:

    An implementation may set limits on the range and precision of numbers.

    When the default type is used, the maximal integer number that can be stored is 9223372036854775807 (INT64_MAX) and the minimal integer number that can be stored is -9223372036854775808 (INT64_MIN). Integer numbers that are out of range will yield over/underflow when used in a constructor. During deserialization, too large or small integer numbers will automatically be stored as number_unsigned_t or number_float_t.

    When the default type is used, the maximal unsigned integer number that can be stored is 18446744073709551615 (UINT64_MAX) and the minimal integer number that can be stored is 0. Integer numbers that are out of range will yield over/underflow when used in a constructor. During deserialization, too large or small integer numbers will automatically be stored as number_integer_t or number_float_t.

    RFC 8259 further states:

    Note that when such software is used, numbers that are integers and are in the range [-2^{53}+1, 2^{53}-1] are interoperable in the sense that implementations will agree exactly on their numeric values.

    As this range is a subrange of the exactly supported range [INT64_MIN, INT64_MAX], this class's integer type is interoperable.

    RFC 8259 states:

    This specification allows implementations to set limits on the range and precision of numbers accepted. Since software that implements IEEE 754-2008 binary64 (double precision) numbers is generally available and widely used, good interoperability can be achieved by implementations that expect no more precision or range than these provide, in the sense that implementations will approximate JSON numbers within the expected precision.

    This implementation does exactly follow this approach, as it uses double precision floating-point numbers. Note values smaller than -1.79769313486232e+308 and values greater than 1.79769313486232e+308 will be stored as NaN internally and be serialized to null.

    Storage

    Integer number values, unsigned integer number values, and floating-point number values are stored directly inside a basic_json type.

    Copyright © 2013-2025 Niels Lohmann
    \ No newline at end of file +

    Limits

    RFC 8259 specifies:

    An implementation may set limits on the maximum depth of nesting.

    In this class, the array's limit of nesting is not explicitly constrained. However, a maximum depth of nesting may be introduced by the compiler or runtime environment. A theoretical limit can be queried by calling the max_size function of a JSON array.

    Storage

    Arrays are stored as pointers in a basic_json type. That is, for any access to array values, a pointer of type array_t* must be dereferenced.

    Strings

    RFC 8259 describes JSON strings as follows:

    A string is a sequence of zero or more Unicode characters.

    Unicode values are split by the JSON class into byte-sized characters during deserialization.

    Default type

    With the default values for StringType (std::string), the default value for string_t is std::string.

    Encoding

    Strings are stored in UTF-8 encoding. Therefore, functions like std::string::size() or std::string::length() return the number of bytes in the string rather than the number of characters or glyphs.

    String comparison

    RFC 8259 states:

    Software implementations are typically required to test names of object members for equality. Implementations that transform the textual representation into sequences of Unicode code units and then perform the comparison numerically, code unit by code unit are interoperable in the sense that implementations will agree in all cases on equality or inequality of two strings. For example, implementations that compare strings with escaped characters unconverted may incorrectly find that "a\\b" and "a\u005Cb" are not equal.

    This implementation is interoperable as it does compare strings code unit by code unit.

    Storage

    String values are stored as pointers in a basic_json type. That is, for any access to string values, a pointer of type string_t* must be dereferenced.

    Booleans

    RFC 8259 implicitly describes a boolean as a type which differentiates the two literals true and false.

    Default type

    With the default values for BooleanType (bool), the default value for boolean_t is bool.

    Storage

    Boolean values are stored directly inside a basic_json type.

    Numbers

    See the number handling article for a detailed discussion on how numbers are handled by this library.

    RFC 8259 describes numbers as follows:

    The representation of numbers is similar to that used in most programming languages. A number is represented in base 10 using decimal digits. It contains an integer component that may be prefixed with an optional minus sign, which may be followed by a fraction part and/or an exponent part. Leading zeros are not allowed. (...) Numeric values that cannot be represented in the grammar below (such as Infinity and NaN) are not permitted.

    This description includes both integer and floating-point numbers. However, C++ allows more precise storage if it is known whether the number is a signed integer, an unsigned integer, or a floating-point number. Therefore, three different types, number_integer_t, number_unsigned_t, and number_float_t are used.

    Default types

    With the default values for NumberIntegerType (std::int64_t), the default value for number_integer_t is std::int64_t. With the default values for NumberUnsignedType (std::uint64_t), the default value for number_unsigned_t is std::uint64_t. With the default values for NumberFloatType (double), the default value for number_float_t is double.

    Default behavior

    • The restrictions about leading zeros are not enforced in C++. Instead, leading zeros in integer literals lead to an interpretation as an octal number. Internally, the value will be stored as a decimal number. For instance, the C++ integer literal 010 will be serialized to 8. During deserialization, leading zeros yield an error.
    • Not-a-number (NaN) values will be serialized to null.

    Limits

    RFC 8259 specifies:

    An implementation may set limits on the range and precision of numbers.

    When the default type is used, the maximal integer number that can be stored is 9223372036854775807 (INT64_MAX) and the minimal integer number that can be stored is -9223372036854775808 (INT64_MIN). Integer numbers that are out of range will yield over/underflow when used in a constructor. During deserialization, too large or small integer numbers will automatically be stored as number_unsigned_t or number_float_t.

    When the default type is used, the maximal unsigned integer number that can be stored is 18446744073709551615 (UINT64_MAX) and the minimal integer number that can be stored is 0. Integer numbers that are out of range will yield over/underflow when used in a constructor. During deserialization, too large or small integer numbers will automatically be stored as number_integer_t or number_float_t.

    RFC 8259 further states:

    Note that when such software is used, numbers that are integers and are in the range [-2^{53}+1, 2^{53}-1] are interoperable in the sense that implementations will agree exactly on their numeric values.

    As this range is a subrange of the exactly supported range [INT64_MIN, INT64_MAX], this class's integer type is interoperable.

    RFC 8259 states:

    This specification allows implementations to set limits on the range and precision of numbers accepted. Since software that implements IEEE 754-2008 binary64 (double precision) numbers is generally available and widely used, good interoperability can be achieved by implementations that expect no more precision or range than these provide, in the sense that implementations will approximate JSON numbers within the expected precision.

    This implementation does exactly follow this approach, as it uses double precision floating-point numbers. Note values smaller than -1.79769313486232e+308 and values greater than 1.79769313486232e+308 will be stored as NaN internally and be serialized to null.

    Storage

    Integer number values, unsigned integer number values, and floating-point number values are stored directly inside a basic_json type.

    Copyright © 2013-2025 Niels Lohmann
    \ No newline at end of file diff --git a/features/types/number_handling/index.html b/features/types/number_handling/index.html index 638d0782d..104b0d52d 100644 --- a/features/types/number_handling/index.html +++ b/features/types/number_handling/index.html @@ -1,4 +1,4 @@ - Number Handling - JSON for Modern C++

    Number Handling

    This document describes how the library is handling numbers.

    Background

    This section briefly summarizes how the JSON specification describes how numbers should be handled.

    JSON number syntax

    JSON defines the syntax of numbers as follows:

    RFC 8259, Section 6

    The representation of numbers is similar to that used in most programming languages. A number is represented in base 10 using decimal digits. It contains an integer component that may be prefixed with an optional minus sign, which may be followed by a fraction part and/or an exponent part. Leading zeros are not allowed.

    A fraction part is a decimal point followed by one or more digits.

    An exponent part begins with the letter E in uppercase or lowercase, which may be followed by a plus or minus sign. The E and optional sign are followed by one or more digits.

    The following railroad diagram from json.org visualizes the number syntax:

    Syntax for JSON numbers

    Number interoperability

    On number interoperability, the following remarks are made:

    RFC 8259, Section 6

    This specification allows implementations to set limits on the range and precision of numbers accepted. Since software that implements IEEE 754 binary64 (double precision) numbers [IEEE754] is generally available and widely used, good interoperability can be achieved by implementations that expect no more precision or range than these provide, in the sense that implementations will approximate JSON numbers within the expected precision. A JSON number such as 1E400 or 3.141592653589793238462643383279 may indicate potential interoperability problems, since it suggests that the software that created it expects receiving software to have greater capabilities for numeric magnitude and precision than is widely available.

    Note that when such software is used, numbers that are integers and are in the range [-2^{53}+1, 2^{53}-1] are interoperable in the sense that implementations will agree exactly on their numeric values.

    Library implementation

    This section describes how this library implements the above number specification.

    Number storage

    In the default json type, numbers are stored as std::uint64_t, std::int64_t, and double, respectively. Thereby, std::uint64_t and std::int64_t are used only if they can store the number without loss of precision. If this is impossible (e.g., if the number is too large), the number is stored as double.

    Notes

    Examples

    • Integer -12345678912345789123456789 is smaller than INT64_MIN and will be stored as floating-point number -1.2345678912345788e+25.
    • Integer 1E3 will be stored as floating-point number 1000.0.

    Number limits

    • Any 64-bit signed or unsigned integer can be stored without loss of precision.
    • Numbers exceeding the limits of double (i.e., numbers that after conversion via std::strtod are not satisfying std::isfinite such as 1E400) will throw exception json.exception.out_of_range.406 during parsing.
    • Floating-point numbers are rounded to the next number representable as double. For instance 3.141592653589793238462643383279 is stored as 0x400921fb54442d18. This is the same behavior as the code double x = 3.141592653589793238462643383279;.

    Interoperability

    • The library interoperable with respect to the specification, because its supported range [-2^{63}, 2^{64}-1] is larger than the described range [-2^{53}+1, 2^{53}-1].
    • All integers outside the range [-2^{63}, 2^{64}-1], as well as floating-point numbers are stored as double. This also concurs with the specification above.

    Zeros

    The JSON number grammar allows for different ways to express zero, and this library will store zeros differently:

    Literal Stored value and type Serialization
    0 std::uint64_t(0) 0
    -0 std::int64_t(0) 0
    0.0 double(0.0) 0.0
    -0.0 double(-0.0) -0.0
    0E0 double(0.0) 0.0
    -0E0 double(-0.0) -0.0

    That is, -0 is stored as a signed integer, but the serialization does not reproduce the -.

    Number serialization

    • Integer numbers are serialized as is; that is, no scientific notation is used.
    • Floating-point numbers are serialized as specified by the %g printf modifier with std::numeric_limits<double>::max_digits10 significant digits. The rationale is to use the shortest representation while still allowing round-tripping.

    Notes regarding precision of floating-point numbers

    As described above, floating-point numbers are rounded to the nearest double and serialized with the shortest representation to allow round-tripping. This can yield confusing examples:

    Copyright © 2013-2025 Niels Lohmann
    \ No newline at end of file diff --git a/home/architecture/index.html b/home/architecture/index.html index 3a22fb0bb..268f11146 100644 --- a/home/architecture/index.html +++ b/home/architecture/index.html @@ -1,4 +1,4 @@ - Architecture - JSON for Modern C++

    Architecture

    Info

    This page is still under construction. Its goal is to provide a high-level overview of the library's architecture. This should help new contributors to get an idea of the used concepts and where to make changes.

    Overview

    The main structure is class nlohmann::basic_json.

    • public API
    • container interface
    • iterators

    Template specializations

    Value storage

    Values are stored as a tagged union of value_t and json_value.

    /// the type of the current element
+ Architecture - JSON for Modern C++      
     
     
      
     
      
     
     
     
     
      
     
     
     
     
     
      
     
     
     
     
           
    Architecture
     
     
    Info
     
    This page is still under construction. Its goal is to provide a high-level overview of the library's architecture. This should help new contributors to get an idea of the used concepts and where to make changes.
     
     
    Overview
     
    The main structure is class nlohmann::basic_json.
     
       
    • public API
      •  
    • container interface
      •  
    • iterators
      •  
     
    Template specializations
      
    Value storage
     
    Values are stored as a tagged union of value_t and json_value.
     
    /// the type of the current element
 value_t m_type = value_t::null;
 
 /// the value of the current element
@@ -52,4 +52,4 @@
 
 template<class T>
 void from_json(const basic_json& j, T& t);
-
     
    Additional features
     
       
    • JSON Pointers
      •  
    • Binary formats
      •  
    • Custom base class
      •  
    • Conversion macros
      •  
     
    Details namespace
     
       
    • C++ feature backports
      •  
       
     
       
      
     
     
     
     
     
     Copyright © 2013-2025 Niels Lohmann 
     
     
                 
     
     
     
     
     
     
     
         
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+

    Additional features

    • JSON Pointers
    • Binary formats
    • Custom base class
    • Conversion macros

    Details namespace

    • C++ feature backports
    Copyright © 2013-2025 Niels Lohmann
    \ No newline at end of file diff --git a/home/customers/index.html b/home/customers/index.html index eda374444..2b6916304 100644 --- a/home/customers/index.html +++ b/home/customers/index.html @@ -1 +1 @@ - Customers - JSON for Modern C++

    Customers

    The library is used in multiple projects, applications, operating systems, etc. The list below is not exhaustive, but the result of an internet search. If you know further customers of the library, please let me know.

    Space Exploration

    • Peregrine Lunar Lander Flight 01 - The library was used for payload management in the Peregrine Moon Lander, developed by Astrobotic Technology and launched as part of NASA's Commercial Lunar Payload Services (CLPS) program. After six days in orbit, the spacecraft was intentionally redirected into Earth's atmosphere, where it burned up over the Pacific Ocean on January 18, 2024.

    Automotive

    Gaming and Entertainment

    • Assassin's Creed: Mirage, a stealth-action game set in the Middle East, focusing on the journey of a young assassin with classic parkour and stealth mechanics
    • Chasm: The Rift, a first-person shooter blending horror and adventure, where players navigate dark realms and battle monsters
    • College Football 25, a college football simulation game featuring gameplay that mimics real-life college teams and competitions
    • Concepts, a digital sketching app designed for creative professionals, offering flexible drawing tools for illustration, design, and brainstorming
    • Depthkit, a tool for creating and capturing volumetric video, enabling immersive 3D experiences and interactive content
    • IMG.LY, a platform offering creative tools and SDKs for integrating advanced image and video editing in applications
    • LOOT, a tool for optimizing the load order of game plugins, commonly used in The Elder Scrolls and Fallout series
    • Madden NFL 25, a sports simulation game capturing the excitement of American football with realistic gameplay and team management features
    • Marne, an unofficial private server platform for hosting custom Battlefield 1 game experiences
    • Minecraft, a popular sandbox video game
    • NHL 22, a hockey simulation game offering realistic gameplay, team management, and various modes to enhance the hockey experience
    • Pixelpart, a 2D animation and video compositing software that allows users to create animated graphics and visual effects with a focus on simplicity and ease of use
    • Razer Cortex, a gaming performance optimizer and system booster designed to enhance the gaming experience
    • Red Dead Redemption II, an open-world action-adventure game following an outlaw's story in the late 1800s, emphasizing deep storytelling and immersive gameplay
    • Snapchat, a multimedia messaging and augmented reality app for communication and entertainment
    • Tactics Ogre: Reborn, a tactical role-playing game featuring strategic battles and deep storytelling elements
    • Throne and Liberty, an MMORPG that offers an expansive fantasy world with dynamic gameplay and immersive storytelling
    • Unity Vivox, a communication service that enables voice and text chat functionality in multiplayer games developed with Unity
    • Zool: Redimensioned, a modern reimagining of the classic platformer featuring fast-paced gameplay and vibrant environments
    • immersivetech, a technology company focused on immersive experiences, providing tools and solutions for virtual and augmented reality applications

    Consumer Electronics

    • Audinate, a provider of networked audio solutions specializing in Dante technology, which facilitates high-quality digital audio transport over IP networks
    • Canon CanoScan LIDE, a series of flatbed scanners offering high-resolution image scanning for home and office use
    • Canon PIXMA Printers, a line of all-in-one inkjet printers known for high-quality printing and wireless connectivity
    • Cisco Webex Desk Camera, a video camera designed for professional-quality video conferencing and remote collaboration
    • Philips Hue Personal Wireless Lighting, a smart lighting system for customizable and wireless home illumination
    • Ray-Ban Meta Smart glasses, a pair of smart glasses designed for capturing photos and videos with integrated connectivity and social features
    • Razer Synapse, a unified configuration software enabling hardware customization for Razer devices
    • Siemens SINEMA Remote Connect, a remote connectivity solution for monitoring and managing industrial networks and devices securely
    • Sony PlayStation 4, a gaming console developed by Sony that offers a wide range of games and multimedia entertainment features
    • Sony Virtual Webcam Driver for Remote Camera, a software driver that enables the use of Sony cameras as virtual webcams for video conferencing and streaming

    Operating Systems

    • Apple iOS and macOS, a family of operating systems developed by Apple, including iOS for mobile devices and macOS for desktop computers
    • Google Fuchsia, an open-source operating system developed by Google, designed to be secure, updatable, and adaptable across various devices
    • SerenityOS, an open-source operating system that aims to provide a simple and beautiful user experience with a focus on simplicity and elegance
    • Yocto, a Linux-based build system for creating custom operating systems and software distributions, tailored for embedded devices and IoT applications

    Development Tools and IDEs

    • Accentize SpectralBalance, an adaptive speech analysis tool designed to enhance audio quality by optimizing frequency balance in recordings
    • Arm Compiler for Linux, a software development toolchain for compiling and optimizing applications on Arm-based Linux systems
    • BBEdit, a professional text and code editor for macOS
    • CoderPad, a collaborative coding platform that enables real-time code interviews and assessments for developers; the library is included in every CoderPad instance and can be accessed with a simple #include "json.hpp"
    • Compiler Explorer, a web-based tool that allows users to write, compile, and visualize the assembly output of code in various programming languages; the library is readily available and accessible with the directive #include <nlohmann/json.hpp>.
    • GitHub CodeQL, a code analysis tool used for identifying security vulnerabilities and bugs in software through semantic queries
    • Hex-Rays, a reverse engineering toolset for analyzing and decompiling binaries, primarily used for security research and vulnerability analysis
    • ImHex, a hex editor designed for reverse engineering, providing advanced features for data analysis and manipulation
    • Intel GPA Framework, a suite of cross-platform tools for capturing, analyzing, and optimizing graphics applications across different APIs
    • Intopix, a provider of advanced image processing and compression solutions used in software development and AV workflows
    • MKVToolNix, a set of tools for creating, editing, and inspecting MKV (Matroska) multimedia container files
    • Meta Yoga, a layout engine that facilitates flexible and efficient user interface design across multiple platforms
    • NVIDIA Nsight Compute, a performance analysis tool for CUDA applications that provides detailed insights into GPU performance metrics
    • Notepad++, a free source code editor that supports various programming languages
    • OpenRGB, an open source RGB lighting control that doesn't depend on manufacturer software
    • OpenTelemetry C++, a library for collecting and exporting observability data in C++, enabling developers to implement distributed tracing and metrics in their application
    • Qt Creator, an IDE for developing applications using the Qt application framework
    • Scanbot SDK, a software development kit (SDK) that provides tools for integrating advanced document scanning and barcode scanning capabilities into applications

    Machine Learning and AI

    • Apple Core ML Tools, a set of tools for converting and configuring machine learning models for deployment in Apple's Core ML framework
    • Avular Mobile Robotics, a platform for developing and deploying mobile robotics solutions
    • Google gemma.cpp, a lightweight C++ inference engine designed for running AI models from the Gemma family
    • llama.cpp, a C++ library designed for efficient inference of large language models (LLMs), enabling streamlined integration into applications
    • MLX, an array framework for machine learning on Apple Silicon
    • Mozilla llamafile, a tool designed for distributing and executing large language models (LLMs) efficiently using a single file format
    • NVIDIA ACE, a suite of real-time AI solutions designed for the development of interactive avatars and digital human applications, enabling scalable and sophisticated user interactions
    • Peer, a platform offering personalized AI assistants for interactive learning and creative collaboration
    • stable-diffusion.cpp, a C++ implementation of the Stable Diffusion image generation model
    • TanvasTouch, a software development kit (SDK) that enables developers to create tactile experiences on touchscreens, allowing users to feel textures and physical sensations in a digital environment
    • TensorFlow, a machine learning framework that facilitates the development and training of models, supporting data serialization and efficient data exchange between components

    Scientific Research and Analysis

    • BLACK, a bounded linear temporal logic (LTL) satisfiability checker
    • CERN Atlas Athena, a software framework used in the ATLAS experiment at the Large Hadron Collider (LHC) for performance monitoring
    • ICU, the International Components for Unicode, a mature library for software globalization and multilingual support
    • KAMERA, a platform for synchronized data collection and real-time deep learning to map marine species like polar bears and seals, aiding Arctic ecosystem research
    • KiCad, a free and open-source software suite for electronic design automation
    • Maple, a symbolic and numeric computing environment for advanced mathematical modeling and analysis
    • MeVisLab, a software framework for medical image processing and visualization.
    • OpenPMD API, a versatile programming interface for accessing and managing scientific data, designed to facilitate the efficient storage, retrieval, and sharing of simulation data across various applications and platforms
    • ParaView, an open-source tool for large-scale data visualization and analysis across various scientific domains
    • QGIS, a free and open-source geographic information system (GIS) application that allows users to create, edit, visualize, and analyze geospatial data across a variety of formats
    • VTK, a software library for 3D computer graphics, image processing, and visualization
    • VolView, a lightweight application for interactive visualization and analysis of 3D medical imaging data.

    Business and Productivity Software

    • ArcGIS PRO, a desktop geographic information system (GIS) application developed by Esri for mapping and spatial analysis
    • Autodesk Desktop, a software platform developed by Autodesk for creating and managing desktop applications and services
    • Check Point, a cybersecurity company specializing in threat prevention and network security solutions, offering a range of products designed to protect enterprises from cyber threats and ensure data integrity
    • Microsoft Office for Mac, a suite of productivity applications developed by Microsoft for macOS, including tools for word processing, spreadsheets, and presentations
    • Microsoft Teams, a team collaboration application offering workspace chat and video conferencing, file storage, and integration of proprietary and third-party applications and services
    • Nexthink Infinity, a digital employee experience management platform for monitoring and improving IT performance
    • Sophos Connect Client, a secure VPN client from Sophos that allows remote users to connect to their corporate network, ensuring secure access to resources and data
    • Stonebranch, a cloud-based cybersecurity solution that integrates backup, disaster recovery, and cybersecurity features to protect data and ensure business continuity for organizations
    • Tablecruncher, a data analysis tool that allows users to import, analyze, and visualize spreadsheet data, offering interactive features for better insights and decision-making
    • magicplan, a mobile application for creating floor plans and interior designs using augmented reality

    Databases and Big Data

    • ADIOS2, a data management framework designed for high-performance input and output operations
    • Cribl Stream, a real-time data processing platform that enables organizations to collect, route, and transform observability data, enhancing visibility and insights into their systems
    • DB Browser for SQLite, a visual open-source tool for creating, designing, and editing SQLite database files
    • MySQL Connector/C++, a C++ library for connecting and interacting with MySQL databases
    • MySQL NDB Cluster, a distributed database system that provides high availability and scalability for MySQL databases
    • MySQL Shell, an advanced client and code editor for interacting with MySQL servers, supporting SQL, Python, and JavaScript
    • PrestoDB, a distributed SQL query engine designed for large-scale data analytics, originally developed by Facebook
    • ROOT Data Analysis Framework, an open-source data analysis framework widely used in high-energy physics and other fields for data processing and visualization
    • WiredTiger, a high-performance storage engine for databases, offering support for compression, concurrency, and checkpointing

    Simulation and Modeling

    • Arcturus HoloSuite, a software toolset for capturing, editing, and streaming volumetric video, featuring advanced compression technologies for high-quality 3D content creation
    • azul, a fast and efficient 3D city model viewer designed for visualizing urban environments and spatial data
    • Blender, a free and open-source 3D creation suite for modeling, animation, rendering, and more
    • cpplot, a library for creating interactive graphs and charts in C++, which can be viewed in web browsers
    • Foundry Nuke, a powerful node-based digital compositing and visual effects application used in film and television post-production
    • GAMS, a high-performance mathematical modeling system for optimization and decision support
    • Kitware SMTK, a software toolkit for managing simulation models and workflows in scientific and engineering applications
    • M-Star, a computational fluid dynamics software for simulating and analyzing fluid flow
    • MapleSim CAD Toolbox, a software extension for MapleSim that integrates CAD models, allowing users to import, manipulate, and analyze 3D CAD data within the MapleSim environment for enhanced modeling and simulation
    • NVIDIA Omniverse, a platform for 3D content creation and collaboration that enables real-time simulations and interactive experiences across various industries
    • Pixar Renderman, a photorealistic 3D rendering software developed by Pixar, widely used in the film industry for creating high-quality visual effects and animations
    • ROS - Robot Operating System, a set of software libraries and tools that assist in developing robot applications
    • UBS, a multinational financial services and banking company

    Enterprise and Cloud Applications

    • Acronis Cyber Protect Cloud, an all-in-one data protection solution that combines backup, disaster recovery, and cybersecurity to safeguard business data from threats like ransomware
    • Baereos, a backup solution that provides data protection and recovery options for various environments, including physical and virtual systems
    • Bitdefender Home Scanner, a tool from Bitdefender that scans devices for malware and security threats, providing a safeguard against potential online dangers
    • Citrix Provisioning, a solution that streamlines the delivery of virtual desktops and applications by allowing administrators to manage and provision resources efficiently across multiple environments
    • Citrix Virtual Apps and Desktops, a solution from Citrix that delivers virtual apps and desktops
    • Cyberarc, a security solution that specializes in privileged access management, enabling organizations to control and monitor access to critical systems and data, thereby enhancing overall cybersecurity posture
    • Egnyte Desktop, a secure cloud storage solution designed for businesses, enabling file sharing, collaboration, and data management across teams while ensuring compliance and data protection
    • Elster, a digital platform developed by German tax authorities for secure and efficient electronic tax filing and management using secunet protect4use
    • Ethereum Solidity, a high-level, object-oriented programming language designed for implementing smart contracts on the Ethereum platform
    • Inciga, a monitoring tool for IT infrastructure, designed to provide insights into system performance and availability through customizable dashboards and alerts
    • Intel Accelerator Management Daemon for VMware ESXi, a management tool designed for monitoring and controlling Intel hardware accelerators within VMware ESXi environments, optimizing performance and resource allocation
    • Juniper Identity Management Service
    • Microsoft Azure IoT SDK, a collection of tools and libraries to help developers connect, build, and deploy Internet of Things (IoT) solutions on the Azure cloud platform
    • Microsoft WinGet, a command-line utility included in the Windows Package Manager
    • plexusAV, a high-performance AV-over-IP transceiver device capable of video encoding and decoding using the IPMX standard
    • Pointr, a platform for indoor positioning and navigation solutions, offering tools and SDKs for developers to create location-based applications
    • secunet protect4use, a secure, passwordless multifactor authentication solution that transforms smartphones into digital keyrings, ensuring high security for online services and digital identities
    • Sencore MRD 7000, a professional multi-channel receiver and decoder supporting UHD and HD stream decoding
    Copyright © 2013-2025 Niels Lohmann
    \ No newline at end of file + Customers - JSON for Modern C++

    Customers

    The library is used in multiple projects, applications, operating systems, etc. The list below is not exhaustive, but the result of an internet search. If you know further customers of the library, please let me know.

    Space Exploration

    • Peregrine Lunar Lander Flight 01 - The library was used for payload management in the Peregrine Moon Lander, developed by Astrobotic Technology and launched as part of NASA's Commercial Lunar Payload Services (CLPS) program. After six days in orbit, the spacecraft was intentionally redirected into Earth's atmosphere, where it burned up over the Pacific Ocean on January 18, 2024.

    Automotive

    Gaming and Entertainment

    • Assassin's Creed: Mirage, a stealth-action game set in the Middle East, focusing on the journey of a young assassin with classic parkour and stealth mechanics
    • Chasm: The Rift, a first-person shooter blending horror and adventure, where players navigate dark realms and battle monsters
    • College Football 25, a college football simulation game featuring gameplay that mimics real-life college teams and competitions
    • Concepts, a digital sketching app designed for creative professionals, offering flexible drawing tools for illustration, design, and brainstorming
    • Depthkit, a tool for creating and capturing volumetric video, enabling immersive 3D experiences and interactive content
    • IMG.LY, a platform offering creative tools and SDKs for integrating advanced image and video editing in applications
    • LOOT, a tool for optimizing the load order of game plugins, commonly used in The Elder Scrolls and Fallout series
    • Madden NFL 25, a sports simulation game capturing the excitement of American football with realistic gameplay and team management features
    • Marne, an unofficial private server platform for hosting custom Battlefield 1 game experiences
    • Minecraft, a popular sandbox video game
    • NHL 22, a hockey simulation game offering realistic gameplay, team management, and various modes to enhance the hockey experience
    • Pixelpart, a 2D animation and video compositing software that allows users to create animated graphics and visual effects with a focus on simplicity and ease of use
    • Razer Cortex, a gaming performance optimizer and system booster designed to enhance the gaming experience
    • Red Dead Redemption II, an open-world action-adventure game following an outlaw's story in the late 1800s, emphasizing deep storytelling and immersive gameplay
    • Snapchat, a multimedia messaging and augmented reality app for communication and entertainment
    • Tactics Ogre: Reborn, a tactical role-playing game featuring strategic battles and deep storytelling elements
    • Throne and Liberty, an MMORPG that offers an expansive fantasy world with dynamic gameplay and immersive storytelling
    • Unity Vivox, a communication service that enables voice and text chat functionality in multiplayer games developed with Unity
    • Zool: Redimensioned, a modern reimagining of the classic platformer featuring fast-paced gameplay and vibrant environments
    • immersivetech, a technology company focused on immersive experiences, providing tools and solutions for virtual and augmented reality applications

    Consumer Electronics

    • Audinate, a provider of networked audio solutions specializing in Dante technology, which facilitates high-quality digital audio transport over IP networks
    • Canon CanoScan LIDE, a series of flatbed scanners offering high-resolution image scanning for home and office use
    • Canon PIXMA Printers, a line of all-in-one inkjet printers known for high-quality printing and wireless connectivity
    • Cisco Webex Desk Camera, a video camera designed for professional-quality video conferencing and remote collaboration
    • Philips Hue Personal Wireless Lighting, a smart lighting system for customizable and wireless home illumination
    • Ray-Ban Meta Smart glasses, a pair of smart glasses designed for capturing photos and videos with integrated connectivity and social features
    • Razer Synapse, a unified configuration software enabling hardware customization for Razer devices
    • Siemens SINEMA Remote Connect, a remote connectivity solution for monitoring and managing industrial networks and devices securely
    • Sony PlayStation 4, a gaming console developed by Sony that offers a wide range of games and multimedia entertainment features
    • Sony Virtual Webcam Driver for Remote Camera, a software driver that enables the use of Sony cameras as virtual webcams for video conferencing and streaming

    Operating Systems

    • Apple iOS and macOS, a family of operating systems developed by Apple, including iOS for mobile devices and macOS for desktop computers
    • Google Fuchsia, an open-source operating system developed by Google, designed to be secure, updatable, and adaptable across various devices
    • SerenityOS, an open-source operating system that aims to provide a simple and beautiful user experience with a focus on simplicity and elegance
    • Yocto, a Linux-based build system for creating custom operating systems and software distributions, tailored for embedded devices and IoT applications

    Development Tools and IDEs

    • Accentize SpectralBalance, an adaptive speech analysis tool designed to enhance audio quality by optimizing frequency balance in recordings
    • Arm Compiler for Linux, a software development toolchain for compiling and optimizing applications on Arm-based Linux systems
    • BBEdit, a professional text and code editor for macOS
    • CoderPad, a collaborative coding platform that enables real-time code interviews and assessments for developers; the library is included in every CoderPad instance and can be accessed with a simple #include "json.hpp"
    • Compiler Explorer, a web-based tool that allows users to write, compile, and visualize the assembly output of code in various programming languages; the library is readily available and accessible with the directive #include <nlohmann/json.hpp>.
    • GitHub CodeQL, a code analysis tool used for identifying security vulnerabilities and bugs in software through semantic queries
    • Hex-Rays, a reverse engineering toolset for analyzing and decompiling binaries, primarily used for security research and vulnerability analysis
    • ImHex, a hex editor designed for reverse engineering, providing advanced features for data analysis and manipulation
    • Intel GPA Framework, a suite of cross-platform tools for capturing, analyzing, and optimizing graphics applications across different APIs
    • Intopix, a provider of advanced image processing and compression solutions used in software development and AV workflows
    • MKVToolNix, a set of tools for creating, editing, and inspecting MKV (Matroska) multimedia container files
    • Meta Yoga, a layout engine that facilitates flexible and efficient user interface design across multiple platforms
    • NVIDIA Nsight Compute, a performance analysis tool for CUDA applications that provides detailed insights into GPU performance metrics
    • Notepad++, a free source code editor that supports various programming languages
    • OpenRGB, an open source RGB lighting control that doesn't depend on manufacturer software
    • OpenTelemetry C++, a library for collecting and exporting observability data in C++, enabling developers to implement distributed tracing and metrics in their application
    • Qt Creator, an IDE for developing applications using the Qt application framework
    • Scanbot SDK, a software development kit (SDK) that provides tools for integrating advanced document scanning and barcode scanning capabilities into applications

    Machine Learning and AI

    • Apple Core ML Tools, a set of tools for converting and configuring machine learning models for deployment in Apple's Core ML framework
    • Avular Mobile Robotics, a platform for developing and deploying mobile robotics solutions
    • Google gemma.cpp, a lightweight C++ inference engine designed for running AI models from the Gemma family
    • llama.cpp, a C++ library designed for efficient inference of large language models (LLMs), enabling streamlined integration into applications
    • MLX, an array framework for machine learning on Apple Silicon
    • Mozilla llamafile, a tool designed for distributing and executing large language models (LLMs) efficiently using a single file format
    • NVIDIA ACE, a suite of real-time AI solutions designed for the development of interactive avatars and digital human applications, enabling scalable and sophisticated user interactions
    • Peer, a platform offering personalized AI assistants for interactive learning and creative collaboration
    • stable-diffusion.cpp, a C++ implementation of the Stable Diffusion image generation model
    • TanvasTouch, a software development kit (SDK) that enables developers to create tactile experiences on touchscreens, allowing users to feel textures and physical sensations in a digital environment
    • TensorFlow, a machine learning framework that facilitates the development and training of models, supporting data serialization and efficient data exchange between components

    Scientific Research and Analysis

    • BLACK, a bounded linear temporal logic (LTL) satisfiability checker
    • CERN Atlas Athena, a software framework used in the ATLAS experiment at the Large Hadron Collider (LHC) for performance monitoring
    • ICU, the International Components for Unicode, a mature library for software globalization and multilingual support
    • KAMERA, a platform for synchronized data collection and real-time deep learning to map marine species like polar bears and seals, aiding Arctic ecosystem research
    • KiCad, a free and open-source software suite for electronic design automation
    • Maple, a symbolic and numeric computing environment for advanced mathematical modeling and analysis
    • MeVisLab, a software framework for medical image processing and visualization.
    • OpenPMD API, a versatile programming interface for accessing and managing scientific data, designed to facilitate the efficient storage, retrieval, and sharing of simulation data across various applications and platforms
    • ParaView, an open-source tool for large-scale data visualization and analysis across various scientific domains
    • QGIS, a free and open-source geographic information system (GIS) application that allows users to create, edit, visualize, and analyze geospatial data across a variety of formats
    • VTK, a software library for 3D computer graphics, image processing, and visualization
    • VolView, a lightweight application for interactive visualization and analysis of 3D medical imaging data.

    Business and Productivity Software

    • ArcGIS PRO, a desktop geographic information system (GIS) application developed by Esri for mapping and spatial analysis
    • Autodesk Desktop, a software platform developed by Autodesk for creating and managing desktop applications and services
    • Check Point, a cybersecurity company specializing in threat prevention and network security solutions, offering a range of products designed to protect enterprises from cyber threats and ensure data integrity
    • Microsoft Office for Mac, a suite of productivity applications developed by Microsoft for macOS, including tools for word processing, spreadsheets, and presentations
    • Microsoft Teams, a team collaboration application offering workspace chat and video conferencing, file storage, and integration of proprietary and third-party applications and services
    • Nexthink Infinity, a digital employee experience management platform for monitoring and improving IT performance
    • Sophos Connect Client, a secure VPN client from Sophos that allows remote users to connect to their corporate network, ensuring secure access to resources and data
    • Stonebranch, a cloud-based cybersecurity solution that integrates backup, disaster recovery, and cybersecurity features to protect data and ensure business continuity for organizations
    • Tablecruncher, a data analysis tool that allows users to import, analyze, and visualize spreadsheet data, offering interactive features for better insights and decision-making
    • magicplan, a mobile application for creating floor plans and interior designs using augmented reality

    Databases and Big Data

    • ADIOS2, a data management framework designed for high-performance input and output operations
    • Cribl Stream, a real-time data processing platform that enables organizations to collect, route, and transform observability data, enhancing visibility and insights into their systems
    • DB Browser for SQLite, a visual open-source tool for creating, designing, and editing SQLite database files
    • MySQL Connector/C++, a C++ library for connecting and interacting with MySQL databases
    • MySQL NDB Cluster, a distributed database system that provides high availability and scalability for MySQL databases
    • MySQL Shell, an advanced client and code editor for interacting with MySQL servers, supporting SQL, Python, and JavaScript
    • PrestoDB, a distributed SQL query engine designed for large-scale data analytics, originally developed by Facebook
    • ROOT Data Analysis Framework, an open-source data analysis framework widely used in high-energy physics and other fields for data processing and visualization
    • WiredTiger, a high-performance storage engine for databases, offering support for compression, concurrency, and checkpointing

    Simulation and Modeling

    • Arcturus HoloSuite, a software toolset for capturing, editing, and streaming volumetric video, featuring advanced compression technologies for high-quality 3D content creation
    • azul, a fast and efficient 3D city model viewer designed for visualizing urban environments and spatial data
    • Blender, a free and open-source 3D creation suite for modeling, animation, rendering, and more
    • cpplot, a library for creating interactive graphs and charts in C++, which can be viewed in web browsers
    • Foundry Nuke, a powerful node-based digital compositing and visual effects application used in film and television post-production
    • GAMS, a high-performance mathematical modeling system for optimization and decision support
    • Kitware SMTK, a software toolkit for managing simulation models and workflows in scientific and engineering applications
    • M-Star, a computational fluid dynamics software for simulating and analyzing fluid flow
    • MapleSim CAD Toolbox, a software extension for MapleSim that integrates CAD models, allowing users to import, manipulate, and analyze 3D CAD data within the MapleSim environment for enhanced modeling and simulation
    • NVIDIA Omniverse, a platform for 3D content creation and collaboration that enables real-time simulations and interactive experiences across various industries
    • Pixar Renderman, a photorealistic 3D rendering software developed by Pixar, widely used in the film industry for creating high-quality visual effects and animations
    • ROS - Robot Operating System, a set of software libraries and tools that assist in developing robot applications
    • UBS, a multinational financial services and banking company

    Enterprise and Cloud Applications

    • Acronis Cyber Protect Cloud, an all-in-one data protection solution that combines backup, disaster recovery, and cybersecurity to safeguard business data from threats like ransomware
    • Baereos, a backup solution that provides data protection and recovery options for various environments, including physical and virtual systems
    • Bitdefender Home Scanner, a tool from Bitdefender that scans devices for malware and security threats, providing a safeguard against potential online dangers
    • Citrix Provisioning, a solution that streamlines the delivery of virtual desktops and applications by allowing administrators to manage and provision resources efficiently across multiple environments
    • Citrix Virtual Apps and Desktops, a solution from Citrix that delivers virtual apps and desktops
    • Cyberarc, a security solution that specializes in privileged access management, enabling organizations to control and monitor access to critical systems and data, thereby enhancing overall cybersecurity posture
    • Egnyte Desktop, a secure cloud storage solution designed for businesses, enabling file sharing, collaboration, and data management across teams while ensuring compliance and data protection
    • Elster, a digital platform developed by German tax authorities for secure and efficient electronic tax filing and management using secunet protect4use
    • Ethereum Solidity, a high-level, object-oriented programming language designed for implementing smart contracts on the Ethereum platform
    • Inciga, a monitoring tool for IT infrastructure, designed to provide insights into system performance and availability through customizable dashboards and alerts
    • Intel Accelerator Management Daemon for VMware ESXi, a management tool designed for monitoring and controlling Intel hardware accelerators within VMware ESXi environments, optimizing performance and resource allocation
    • Juniper Identity Management Service
    • Microsoft Azure IoT SDK, a collection of tools and libraries to help developers connect, build, and deploy Internet of Things (IoT) solutions on the Azure cloud platform
    • Microsoft WinGet, a command-line utility included in the Windows Package Manager
    • plexusAV, a high-performance AV-over-IP transceiver device capable of video encoding and decoding using the IPMX standard
    • Pointr, a platform for indoor positioning and navigation solutions, offering tools and SDKs for developers to create location-based applications
    • secunet protect4use, a secure, passwordless multifactor authentication solution that transforms smartphones into digital keyrings, ensuring high security for online services and digital identities
    • Sencore MRD 7000, a professional multi-channel receiver and decoder supporting UHD and HD stream decoding
    Copyright © 2013-2025 Niels Lohmann
    \ No newline at end of file diff --git a/home/design_goals/index.html b/home/design_goals/index.html index e0cc655cc..fc1d82ac5 100644 --- a/home/design_goals/index.html +++ b/home/design_goals/index.html @@ -1 +1 @@ - Design goals - JSON for Modern C++

    Design goals

    There are myriads of JSON libraries out there, and each may even have its reason to exist. Our class had these design goals:

    • Intuitive syntax. In languages such as Python, JSON feels like a first-class data type. We used all the operator magic of modern C++ to achieve the same feeling in your code.

    • Trivial integration. Our whole code consists of a single header file json.hpp. That's it. No library, no subproject, no dependencies, no complex build system. The class is written in vanilla C++11. All in all, everything should require no adjustment of your compiler flags or project settings.

    • Serious testing. Our class is heavily unit-tested and covers 100% of the code, including all exceptional behavior. Furthermore, we checked with Valgrind and the Clang Sanitizers that there are no memory leaks. Google OSS-Fuzz additionally runs fuzz tests against all parsers 24/7, effectively executing billions of tests so far. To maintain high quality, the project is following the Core Infrastructure Initiative (CII) best practices.

    Other aspects were not so important to us:

    • Memory efficiency. Each JSON object has an overhead of one pointer (the maximal size of a union) and one enumeration element (1 byte). The default generalization uses the following C++ data types: std::string for strings, int64_t, uint64_t or double for numbers, std::map for objects, std::vector for arrays, and bool for Booleans. However, you can template the generalized class basic_json to your needs.

    • Speed. There are certainly faster JSON libraries out there. However, if your goal is to speed up your development by adding JSON support with a single header, then this library is the way to go. If you know how to use a std::vector or std::map, you are already set.

    See the contribution guidelines for more information.

    Copyright © 2013-2025 Niels Lohmann
    \ No newline at end of file + Design goals - JSON for Modern C++

    Design goals

    There are myriads of JSON libraries out there, and each may even have its reason to exist. Our class had these design goals:

    • Intuitive syntax. In languages such as Python, JSON feels like a first-class data type. We used all the operator magic of modern C++ to achieve the same feeling in your code.

    • Trivial integration. Our whole code consists of a single header file json.hpp. That's it. No library, no subproject, no dependencies, no complex build system. The class is written in vanilla C++11. All in all, everything should require no adjustment of your compiler flags or project settings.

    • Serious testing. Our class is heavily unit-tested and covers 100% of the code, including all exceptional behavior. Furthermore, we checked with Valgrind and the Clang Sanitizers that there are no memory leaks. Google OSS-Fuzz additionally runs fuzz tests against all parsers 24/7, effectively executing billions of tests so far. To maintain high quality, the project is following the Core Infrastructure Initiative (CII) best practices.

    Other aspects were not so important to us:

    • Memory efficiency. Each JSON object has an overhead of one pointer (the maximal size of a union) and one enumeration element (1 byte). The default generalization uses the following C++ data types: std::string for strings, int64_t, uint64_t or double for numbers, std::map for objects, std::vector for arrays, and bool for Booleans. However, you can template the generalized class basic_json to your needs.

    • Speed. There are certainly faster JSON libraries out there. However, if your goal is to speed up your development by adding JSON support with a single header, then this library is the way to go. If you know how to use a std::vector or std::map, you are already set.

    See the contribution guidelines for more information.

    Copyright © 2013-2025 Niels Lohmann
    \ No newline at end of file diff --git a/home/exceptions/index.html b/home/exceptions/index.html index ea5fb83fa..279031b2d 100644 --- a/home/exceptions/index.html +++ b/home/exceptions/index.html @@ -1,4 +1,4 @@ - Exceptions - JSON for Modern C++

    Exceptions

    Overview

    Base type

    All exceptions inherit from class json::exception (which in turn inherits from std::exception). It is used as the base class for all exceptions thrown by the basic_json class. This class can hence be used as "wildcard" to catch exceptions.

    classDiagram
+ Exceptions - JSON for Modern C++      
     
     
      
     
      
     
     
     
     
      
     
     
     
     
     
      
     
     
     
     
           
    Exceptions
     
    Overview
     
    Base type
     
    All exceptions inherit from class json::exception (which in turn inherits from std::exception). It is used as the base class for all exceptions thrown by the basic_json class. This class can hence be used as "wildcard" to catch exceptions.
     
    classDiagram
   direction LR
     class `std::exception` {
         <<interface>>
@@ -280,4 +280,4 @@ exception id: 401
 
     
    Output:
     
    message: [json.exception.other_error.501] unsuccessful: {"op":"test","path":"/best_biscuit/name","value":"Choco Leibniz"}
 exception id: 501
 
      
    json.exception.other_error.501
     
    A JSON Patch operation 'test' failed. The unsuccessful operation is also printed.
     
     
    Example message
     
    Executing {"op":"test", "path":"/baz", "value":"bar"} on {"baz": "qux"}:
     
    [json.exception.other_error.501] unsuccessful: {"op":"test","path":"/baz","value":"bar"}
-
    Copyright © 2013-2025 Niels Lohmann
    \ No newline at end of file +
    Copyright © 2013-2025 Niels Lohmann
    \ No newline at end of file diff --git a/home/faq/index.html b/home/faq/index.html index 3e9882eca..a94c9fbe8 100644 --- a/home/faq/index.html +++ b/home/faq/index.html @@ -1,4 +1,4 @@ - FAQ - JSON for Modern C++

    Frequently Asked Questions (FAQ)

    Known bugs

    Brace initialization yields arrays

    Question

    Why does

    json j{true};
+ FAQ - JSON for Modern C++      
     
     
      
     
      
     
     
     
     
      
     
     
     
     
     
      
     
     
     
     
           
    Frequently Asked Questions (FAQ)
     
    Known bugs
     
    Brace initialization yields arrays
     
     
    Question
     
    Why does
     
    json j{true};
 
     
    and
     
    json j(true);
 
     
    yield different results ([true] vs. true)?
     
     
    This is a known issue, and -- even worse -- the behavior differs between GCC and Clang. The "culprit" for this is the library's constructor overloads for initializer lists to allow syntax like
     
    json array = {1, 2, 3, 4};
 
     
    for arrays and
     
    json object = {{"one", 1}, {"two", 2}}; 
@@ -26,4 +26,4 @@
 
     
     
    Exceptions
     
    Parsing without exceptions
     
     
    Question
     
    Is it possible to indicate a parse error without throwing an exception?
     
     
    Yes, see Parsing and exceptions.
     
    Key name in exceptions
     
     
    Question
     
    Can I get the key of the object item that caused an exception?
     
     
    Yes, you can. Please define the symbol JSON_DIAGNOSTICS to get extended diagnostics messages.
     
    Serialization issues
     
    Number precision
     
     
    Question
     
       
    • It seems that precision is lost when serializing a double.
      •  
    • Can I change the precision for floating-point serialization?
      •  
     
     
    The library uses std::numeric_limits<number_float_t>::digits10 (15 for IEEE doubles) digits for serialization. This value is sufficient to guarantee roundtripping. If one uses more than this number of digits of precision, then string -> value -> string is not guaranteed to round-trip.
     
     
    cppreference.com
     
    The value of std::numeric_limits<T>::digits10 is the number of base-10 digits that can be represented by the type T without change, that is, any number with this many significant decimal digits can be converted to a value of type T and back to decimal form, without change due to rounding or overflow. 
     
     
     
    Tip
     
    The website https://float.exposed gives a good insight into the internal storage of floating-point numbers.
     
     
    See this section on the library's number handling for more information.
     
    Compilation issues
     
    Android SDK
     
     
    Question
     
    Why does the code not compile with Android SDK?
     
     
    Android defaults to using very old compilers and C++ libraries. To fix this, add the following to your Application.mk. This will switch to the LLVM C++ library, the Clang compiler, and enable C++11 and other features disabled by default.
     
    APP_STL := c++_shared
 NDK_TOOLCHAIN_VERSION := clang3.6
 APP_CPPFLAGS += -frtti -fexceptions
-
     
    The code compiles successfully with Android NDK, Revision 9 - 11 (and possibly later) and CrystaX's Android NDK version 10.
     
    Missing STL function
     
     
    Questions
     
       
    • Why do I get a compilation error 'to_string' is not a member of 'std' (or similarly, for strtod or strtof)?
      •  
    • Why does the code not compile with MinGW or Android SDK?
      •  
     
     
    This is not an issue with the code, but rather with the compiler itself. On Android, see above to build with a newer environment. For MinGW, please refer to this site and this discussion for information on how to fix this bug. For Android NDK using APP_STL := gnustl_static, please refer to this discussion.
    Copyright © 2013-2025 Niels Lohmann
    \ No newline at end of file +

    The code compiles successfully with Android NDK, Revision 9 - 11 (and possibly later) and CrystaX's Android NDK version 10.

    Missing STL function

    Questions

    • Why do I get a compilation error 'to_string' is not a member of 'std' (or similarly, for strtod or strtof)?
    • Why does the code not compile with MinGW or Android SDK?

    This is not an issue with the code, but rather with the compiler itself. On Android, see above to build with a newer environment. For MinGW, please refer to this site and this discussion for information on how to fix this bug. For Android NDK using APP_STL := gnustl_static, please refer to this discussion.

    Copyright © 2013-2025 Niels Lohmann
    \ No newline at end of file diff --git a/home/license/index.html b/home/license/index.html index 04c6ee1f6..6f37fcc9f 100644 --- a/home/license/index.html +++ b/home/license/index.html @@ -1 +1 @@ - License - JSON for Modern C++

    License

    The class is licensed under the MIT License:

    Copyright © 2013-2025 Niels Lohmann

    Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the “Software”), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

    The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

    THE SOFTWARE IS PROVIDED “AS IS”, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

    The class contains the UTF-8 Decoder from Bjoern Hoehrmann which is licensed under the MIT License (see above). Copyright © 2008-2009 Björn Hoehrmann bjoern@hoehrmann.de

    The class contains a slightly modified version of the Grisu2 algorithm from Florian Loitsch which is licensed under the MIT License (see above). Copyright © 2009 Florian Loitsch

    The class contains a copy of Hedley from Evan Nemerson which is licensed as CC0-1.0.

    Copyright © 2013-2025 Niels Lohmann
    \ No newline at end of file + License - JSON for Modern C++

    License

    The class is licensed under the MIT License:

    Copyright © 2013-2025 Niels Lohmann

    Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the “Software”), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

    The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

    THE SOFTWARE IS PROVIDED “AS IS”, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

    The class contains the UTF-8 Decoder from Bjoern Hoehrmann which is licensed under the MIT License (see above). Copyright © 2008-2009 Björn Hoehrmann bjoern@hoehrmann.de

    The class contains a slightly modified version of the Grisu2 algorithm from Florian Loitsch which is licensed under the MIT License (see above). Copyright © 2009 Florian Loitsch

    The class contains a copy of Hedley from Evan Nemerson which is licensed as CC0-1.0.

    Copyright © 2013-2025 Niels Lohmann
    \ No newline at end of file diff --git a/home/releases/index.html b/home/releases/index.html index aeeb705dc..874262c44 100644 --- a/home/releases/index.html +++ b/home/releases/index.html @@ -1,4 +1,4 @@ - Releases - JSON for Modern C++

    Releases

    v3.7.3

    Files

    Release date: 2019-11-17 SHA-256: 3b5d2b8f8282b80557091514d8ab97e27f9574336c804ee666fda673a9b59926 (json.hpp), 87b5884741427220d3a33df1363ae0e8b898099fbc59f1c451113f6732891014 (include.zip)

    Summary

    This release fixes a bug introduced in release 3.7.2 which could yield quadratic complexity in destructor calls. All changes are backward-compatible.

    🐛 Bug Fixes

    • Removed reserve() calls from the destructor which could lead to quadratic complexity. #1837 #1838

    🔥 Deprecated functions

    This release does not deprecate any functions. As an overview, the following functions have been deprecated in earlier versions and will be removed in the next major version (i.e., 4.0.0):

    v3.7.2

    Files

    Release date: 2019-11-10 SHA-256: 0a65fcbbe1b334d3f45c9498e5ee28c3f3b2428aea98557da4a3ff12f0f14ad6 (json.hpp), 67f69c9a93b7fa0612dc1b6273119d2c560317333581845f358aaa68bff8f087 (include.zip)

    Summary

    Project bad_json_parsers tested how JSON parser libraries react on deeply nested inputs. It turns out that this library segfaulted at a certain nesting depth. This bug was fixed with this release. Now the parsing is only bounded by the available memory. All changes are backward-compatible.

    🐛 Bug Fixes

    • Fixed a bug that lead to stack overflow for deeply nested JSON values (objects, array) by changing the implementation of the destructor from a recursive to an iterative approach. #832, #1419, #1835

    🔨 Further Changes

    • Added WhiteStone Bolt. #1830

    🔥 Deprecated functions

    This release does not deprecate any functions. As an overview, the following functions have been deprecated in earlier versions and will be removed in the next major version (i.e., 4.0.0):

    v3.7.1

    Files

    Release date: 2019-11-06 SHA-256: b5ba7228f3c22a882d379e93d08eab4349458ee16fbf45291347994eac7dc7ce (json.hpp), 77b9f54b34e7989e6f402afb516f7ff2830df551c3a36973085e2c7a6b1045fe (include.zip)

    Summary

    This release fixes several small bugs in the library. All changes are backward-compatible.

    🐛 Bug Fixes

    • Fixed a segmentation fault when serializing std::int64_t minimum value. #1708 #1722
    • Fixed the contains() function for JSON Pointers. #1727 #1741
    • Fixed too lax SFINAE guard for conversion from std::pair and std::tuple to json. #1805 #1806 #1825 #1826
    • Fixed some regressions detected by UBSAN. Updated CI to use Clang-Tidy 7.1.0. #1716 #1728
    • Fixed integer truncation in iteration_proxy. #1797
    • Updated Hedley to v11 to fix a E2512 error in MSVC. #1799
    • Fixed a compile error in enum deserialization of non non-default-constructible types. #1647 #1821
    • Fixed the conversion from json to std::valarray.

    ⚡ Improvements

    • The items() function can now be used with a custom string type. #1765
    • Made json_pointer::back const. #1764 #1769
    • Meson is part of the release archive. #1672 #1694
    • Improved documentation on the Meson and Spack package manager. #1694 #1720

    🔨 Further Changes

    • Added GitHub Workflow with ubuntu-latest/GCC 7.4.0 as CI step.
    • Added GCC 9 to Travis CI to compile with C++20 support. #1724
    • Added MSVC 2019 to the AppVeyor CI. #1780
    • Added badge to fuzzing status.
    • Fixed some cppcheck warnings. #1760
    • Fixed several typos in the documentation. #1720 #1767 #1803
    • Added documentation on the JSON_THROW_USER, JSON_TRY_USER, and JSON_CATCH_USER macros to control user-defined exception handling.
    • Used GitHub's CODEOWNERS and SECURITY feature.
    • Removed GLOB from CMake files. #1779
    • Updated to Doctest 2.3.5.

    🔥 Deprecated functions

    This release does not deprecate any functions. As an overview, the following functions have been deprecated in earlier versions and will be removed in the next major version (i.e., 4.0.0):

    v3.7.0

    Files

    Release date: 2019-07-28 SHA-256: a503214947952b69f0062f572cb74c17582a495767446347ce2e452963fc2ca4 (json.hpp), 541c34438fd54182e9cdc68dd20c898d766713ad6d901fb2c6e28ff1f1e7c10d (include.zip)

    Summary

    This release introduces a few convenience functions and performs a lot of house keeping (bug fixes and small improvements). All changes are backward-compatible.

    ✨ New Features

    • Add overload of the contains function to check if a JSON pointer is valid without throwing exceptions, just like its counterpart for object keys. #1600
    • Add a function to_string to allow for generic conversion to strings. #916 #1585
    • Add return value for the emplace_back function, returning a reference to the added element just like C++17 is introducing this for std::vector. #1609
    • Add info how to use the library with the pacman package manager on MSYS2. #1670

    🐛 Bug Fixes

    • Fix an issue where typedefs with certain names yielded a compilation error. #1642 #1643
    • Fix a conversion to std::string_view in the unit tests. #1634 #1639
    • Fix MSVC Debug build. #1536 #1570 #1608
    • Fix get_to method to clear existing content before writing. #1511 #1555
    • Fix a -Wc++17-extensions warning. nodiscard attributes are now only used with Clang when -std=c++17 is used. #1535 #1551

    ⚡ Improvements

    🔨 Further Changes

    • Use GNUInstallDirs to set library install directories. #1673
    • Fix links in the README. #1620 #1621 #1622 #1623 #1625
    • Mention json type on the documentation start page. #1616
    • Complete documentation of value() function with respect to type_error.302 exception. #1601
    • Fix links in the documentation. #1598
    • Add regression tests for MSVC. #1543 #1570
    • Use CircleCI for continuous integration.
    • Use Doozer for continuous integration on Linux (CentOS, Raspbian, Fedora)
    • Add tests to check each CMake flag (JSON_BuildTests, JSON_Install, JSON_MultipleHeaders, JSON_Sanitizer, JSON_Valgrind, JSON_NoExceptions, JSON_Coverage).
    • Use Hedley to avoid re-inventing several compiler-agnostic feature macros like JSON_DEPRECATED, JSON_NODISCARD, JSON_LIKELY, JSON_UNLIKELY, JSON_HAS_CPP_14, or JSON_HAS_CPP_17. Functions taking or returning pointers are annotated accordingly when a pointer will not be null.
    • Build and run tests on AppVeyor in DEBUG and RELEASE mode.

    🔥 Deprecated functions

    This release does not deprecate any functions. As an overview, the following functions have been deprecated in earlier versions and will be removed in the next major version (i.e., 4.0.0):

    v3.6.1

    Files

    Release date: 2019-03-20 SHA-256: d2eeb25d2e95bffeb08ebb7704cdffd2e8fca7113eba9a0b38d60a5c391ea09a (json.hpp), 69cc88207ce91347ea530b227ff0776db82dcb8de6704e1a3d74f4841bc651cf (include.zip)

    Summary

    This release fixes a regression and a bug introduced by the earlier 3.6.0 release. All changes are backward-compatible.

    🐛 Bug Fixes

    • Fixed regression of #590 which could lead to compilation errors with GCC 7 and GCC 8. #1530
    • Fixed a compilation error when <Windows.h> was included. #1531

    🔨 Further Changes

    • Fixed a warning for missing field initializers. #1527

    🔥 Deprecated functions

    This release does not deprecate any functions. As an overview, the following functions have been deprecated in earlier versions and will be removed in the next major version (i.e., 4.0.0):

    v3.6.0

    Files

    Release date: 2019-03-20 SHA-256: ce9839370f28094c71107c405affb3b08c4a098154988014cbb0800b1c44a831 (json.hpp), 237c5e66e7f8186a02804ce9dbd5f69ce89fe7424ef84adf6142e973bd9532f4 (include.zip)

    ℹ️ This release introduced a regression. Please update to version 3.6.1!

    Summary

    This release adds some convenience functions for JSON Pointers, introduces a contains function to check if a key is present in an object, and improves the performance of integer serialization. Furthermore, a lot of small bug fixes and improvements have been made. All changes are backward-compatible.

    ✨ New Features

    • Overworked the public interface for JSON Pointers. The creation of JSON Pointers is simplified with operator/ and operator/=. JSON Pointers can be inspected with empty, back, and parent_pointer, and manipulated with push_back and pop_back. #1434
    • Added a boolean method contains to check whether an element exists in a JSON object with a given key. Returns false when called on non-object types. #1471 #1474

    🐛 Bug Fixes

    • Fixed a compilation issues with libc 2.12. #1483 #1514
    • Fixed endian conversion on PPC64. #1489
    • Fixed library to compile with GCC 9. #1472 #1492
    • Fixed a compilation issue with GCC 7 on CentOS. #1496
    • Fixed an integer overflow. #1447
    • Fixed buffer flushing in serializer. #1445 #1446

    ⚡ Improvements

    • The performance of dumping integers has been greatly improved. #1411
    • Added CMake parameter JSON_Install to control whether the library should be installed (default: on). #1330
    • Fixed a lot of compiler and linter warnings. #1400 #1435 #1502
    • Reduced required CMake version from 3.8 to 3.1. #1409 #1428 #1441 #1498
    • Added nodiscard attribute to meta(), array(), object(), from_cbor, from_msgpack, from_ubjson, from_bson, and parse. #1433

    🔨 Further Changes

    • Added missing headers. #1500
    • Fixed typos and broken links in README. #1417 #1423 #1425 #1451 #1455 #1491
    • Fixed documentation of parse function. #1473
    • Suppressed warning that cannot be fixed inside the library. #1401 #1468
    • Imroved package manager suppert:
      • Updated Buckaroo instructions. #1495
      • Improved Meson support. #1463
      • Added Conda package manager documentation. #1430
      • Added NuGet package manager documentation. #1132
    • Continuous Integration
      • Removed unstable or deprecated Travis builders (Xcode 6.4 - 8.2) and added Xcode 10.1 builder.
      • Added Clang 7 to Travis CI.
      • Fixed AppVeyor x64 builds. #1374 #1414
    • Updated thirdparty libraries:
      • Catch 1.12.0 -> 1.12.2
      • Google Benchmark 1.3.0 -> 1.4.1
      • Doxygen 1.8.15 -> 1.8.16

    🔥 Deprecated functions

    This release does not deprecate any functions. As an overview, the following functions have been deprecated in earlier versions and will be removed in the next major version (i.e., 4.0.0):

    v3.5.0

    Files

    Release date: 2018-12-22 SHA-256: 8a6dbf3bf01156f438d0ca7e78c2971bca50eec4ca6f0cf59adf3464c43bb9d5 (json.hpp), 3564da9c5b0cf2e032f97c69baedf10ddbc98030c337d0327a215ea72259ea21 (include.zip)

    Summary

    This release introduces the support for structured bindings and reading from FILE*. Besides, a few bugs have been fixed. All changes are backward-compatible.

    ✨ New Features

    • Structured bindings are now supported for JSON objects and arrays via the items() member function, so finally this code is possible: 

      for (auto& [key, val] : j.items()) {
+ Releases - JSON for Modern C++      
       
       
        
       
        
       
       
       
       
        
       
       
       
       
       
        
       
       
       
       
             
      Releases
       
      v3.7.3
       
       
      Files
        
       
      Release date: 2019-11-17 SHA-256: 3b5d2b8f8282b80557091514d8ab97e27f9574336c804ee666fda673a9b59926 (json.hpp), 87b5884741427220d3a33df1363ae0e8b898099fbc59f1c451113f6732891014 (include.zip)
       
      Summary
       
      This release fixes a bug introduced in release 3.7.2 which could yield quadratic complexity in destructor calls. All changes are backward-compatible.
       
      🐛 Bug Fixes
       
         
      • Removed reserve() calls from the destructor which could lead to quadratic complexity. #1837 #1838
        •  
       
      🔥 Deprecated functions
       
      This release does not deprecate any functions. As an overview, the following functions have been deprecated in earlier versions and will be removed in the next major version (i.e., 4.0.0):
        
      v3.7.2
       
       
      Files
        
       
      Release date: 2019-11-10 SHA-256: 0a65fcbbe1b334d3f45c9498e5ee28c3f3b2428aea98557da4a3ff12f0f14ad6 (json.hpp), 67f69c9a93b7fa0612dc1b6273119d2c560317333581845f358aaa68bff8f087 (include.zip)
       
      Summary
       
      Project bad_json_parsers tested how JSON parser libraries react on deeply nested inputs. It turns out that this library segfaulted at a certain nesting depth. This bug was fixed with this release. Now the parsing is only bounded by the available memory. All changes are backward-compatible.
       
      🐛 Bug Fixes
       
         
      • Fixed a bug that lead to stack overflow for deeply nested JSON values (objects, array) by changing the implementation of the destructor from a recursive to an iterative approach. #832, #1419, #1835
        •  
       
      🔨 Further Changes
       
         
      • Added WhiteStone Bolt. #1830
        •  
       
      🔥 Deprecated functions
       
      This release does not deprecate any functions. As an overview, the following functions have been deprecated in earlier versions and will be removed in the next major version (i.e., 4.0.0):
        
      v3.7.1
       
       
      Files
        
       
      Release date: 2019-11-06 SHA-256: b5ba7228f3c22a882d379e93d08eab4349458ee16fbf45291347994eac7dc7ce (json.hpp), 77b9f54b34e7989e6f402afb516f7ff2830df551c3a36973085e2c7a6b1045fe (include.zip)
       
      Summary
       
      This release fixes several small bugs in the library. All changes are backward-compatible.
       
      🐛 Bug Fixes
       
         
      • Fixed a segmentation fault when serializing std::int64_t minimum value. #1708 #1722
        •  
      • Fixed the contains() function for JSON Pointers. #1727 #1741
        •  
      • Fixed too lax SFINAE guard for conversion from std::pair and std::tuple to json. #1805 #1806 #1825 #1826
        •  
      • Fixed some regressions detected by UBSAN. Updated CI to use Clang-Tidy 7.1.0. #1716 #1728
        •  
      • Fixed integer truncation in iteration_proxy. #1797
        •  
      • Updated Hedley to v11 to fix a E2512 error in MSVC. #1799
        •  
      • Fixed a compile error in enum deserialization of non non-default-constructible types. #1647 #1821
        •  
      • Fixed the conversion from json to std::valarray.
        •  
       
      ⚡ Improvements
       
         
      • The items() function can now be used with a custom string type. #1765
        •  
      • Made json_pointer::back const. #1764 #1769
        •  
      • Meson is part of the release archive. #1672 #1694 
        •  
      • Improved documentation on the Meson and Spack package manager. #1694 #1720
        •  
       
      🔨 Further Changes
       
         
      • Added GitHub Workflow with ubuntu-latest/GCC 7.4.0 as CI step.
        •  
      • Added GCC 9 to Travis CI to compile with C++20 support. #1724
        •  
      • Added MSVC 2019 to the AppVeyor CI. #1780
        •  
      • Added badge to fuzzing status.
        •  
      • Fixed some cppcheck warnings. #1760
        •  
      • Fixed several typos in the documentation. #1720 #1767 #1803
        •  
      • Added documentation on the JSON_THROW_USER, JSON_TRY_USER, and JSON_CATCH_USER macros to control user-defined exception handling.
        •  
      • Used GitHub's CODEOWNERS and SECURITY feature.
        •  
      • Removed GLOB from CMake files. #1779
        •  
      • Updated to Doctest 2.3.5.
        •  
       
      🔥 Deprecated functions
       
      This release does not deprecate any functions. As an overview, the following functions have been deprecated in earlier versions and will be removed in the next major version (i.e., 4.0.0):
        
      v3.7.0
       
       
      Files
        
       
      Release date: 2019-07-28 SHA-256: a503214947952b69f0062f572cb74c17582a495767446347ce2e452963fc2ca4 (json.hpp), 541c34438fd54182e9cdc68dd20c898d766713ad6d901fb2c6e28ff1f1e7c10d (include.zip)
       
      Summary
       
      This release introduces a few convenience functions and performs a lot of house keeping (bug fixes and small improvements). All changes are backward-compatible.
       
      ✨ New Features
       
         
      • Add overload of the contains function to check if a JSON pointer is valid without throwing exceptions, just like its counterpart for object keys. #1600
        •  
      • Add a function to_string to allow for generic conversion to strings. #916 #1585
        •  
      • Add return value for the emplace_back function, returning a reference to the added element just like C++17 is introducing this for std::vector. #1609
        •  
      • Add info how to use the library with the pacman package manager on MSYS2. #1670
        •  
       
      🐛 Bug Fixes
       
         
      • Fix an issue where typedefs with certain names yielded a compilation error. #1642 #1643
        •  
      • Fix a conversion to std::string_view in the unit tests. #1634 #1639
        •  
      • Fix MSVC Debug build. #1536 #1570 #1608
        •  
      • Fix get_to method to clear existing content before writing. #1511 #1555
        •  
      • Fix a -Wc++17-extensions warning. nodiscard attributes are now only used with Clang when -std=c++17 is used. #1535 #1551
        •  
       
      ⚡ Improvements
        
      🔨 Further Changes
       
         
      • Use GNUInstallDirs to set library install directories. #1673
        •  
      • Fix links in the README. #1620 #1621 #1622 #1623 #1625
        •  
      • Mention json type on the documentation start page. #1616
        •  
      • Complete documentation of value() function with respect to type_error.302 exception. #1601
        •  
      • Fix links in the documentation. #1598
        •  
      • Add regression tests for MSVC. #1543 #1570
        •  
      • Use CircleCI for continuous integration.
        •  
      • Use Doozer for continuous integration on Linux (CentOS, Raspbian, Fedora)
        •  
      • Add tests to check each CMake flag (JSON_BuildTests, JSON_Install, JSON_MultipleHeaders, JSON_Sanitizer, JSON_Valgrind, JSON_NoExceptions, JSON_Coverage).
        •  
      • Use Hedley to avoid re-inventing several compiler-agnostic feature macros like JSON_DEPRECATED, JSON_NODISCARD, JSON_LIKELY, JSON_UNLIKELY, JSON_HAS_CPP_14, or JSON_HAS_CPP_17. Functions taking or returning pointers are annotated accordingly when a pointer will not be null.
        •  
      • Build and run tests on AppVeyor in DEBUG and RELEASE mode.
        •  
       
      🔥 Deprecated functions
       
      This release does not deprecate any functions. As an overview, the following functions have been deprecated in earlier versions and will be removed in the next major version (i.e., 4.0.0):
        
      v3.6.1
       
       
      Files
        
       
      Release date: 2019-03-20 SHA-256: d2eeb25d2e95bffeb08ebb7704cdffd2e8fca7113eba9a0b38d60a5c391ea09a (json.hpp), 69cc88207ce91347ea530b227ff0776db82dcb8de6704e1a3d74f4841bc651cf (include.zip)
       
      Summary
       
      This release fixes a regression and a bug introduced by the earlier 3.6.0 release. All changes are backward-compatible.
       
      🐛 Bug Fixes
       
         
      • Fixed regression of #590 which could lead to compilation errors with GCC 7 and GCC 8. #1530
        •  
      • Fixed a compilation error when <Windows.h> was included. #1531
        •  
       
      🔨 Further Changes
       
         
      • Fixed a warning for missing field initializers. #1527
        •  
       
      🔥 Deprecated functions
       
      This release does not deprecate any functions. As an overview, the following functions have been deprecated in earlier versions and will be removed in the next major version (i.e., 4.0.0):
        
      v3.6.0
       
       
      Files
        
       
      Release date: 2019-03-20 SHA-256: ce9839370f28094c71107c405affb3b08c4a098154988014cbb0800b1c44a831 (json.hpp), 237c5e66e7f8186a02804ce9dbd5f69ce89fe7424ef84adf6142e973bd9532f4 (include.zip)
       
      ℹ️ This release introduced a regression. Please update to version 3.6.1!
       
      Summary
       
      This release adds some convenience functions for JSON Pointers, introduces a contains function to check if a key is present in an object, and improves the performance of integer serialization. Furthermore, a lot of small bug fixes and improvements have been made. All changes are backward-compatible.
       
      ✨ New Features
       
         
      • Overworked the public interface for JSON Pointers. The creation of JSON Pointers is simplified with operator/ and operator/=. JSON Pointers can be inspected with empty, back, and parent_pointer, and manipulated with push_back and pop_back. #1434
        •  
      • Added a boolean method contains to check whether an element exists in a JSON object with a given key. Returns false when called on non-object types. #1471 #1474
        •  
       
      🐛 Bug Fixes
       
         
      • Fixed a compilation issues with libc 2.12. #1483 #1514
        •  
      • Fixed endian conversion on PPC64. #1489
        •  
      • Fixed library to compile with GCC 9. #1472 #1492
        •  
      • Fixed a compilation issue with GCC 7 on CentOS. #1496
        •  
      • Fixed an integer overflow. #1447
        •  
      • Fixed buffer flushing in serializer. #1445 #1446
        •  
       
      ⚡ Improvements
       
         
      • The performance of dumping integers has been greatly improved. #1411
        •  
      • Added CMake parameter JSON_Install to control whether the library should be installed (default: on). #1330
        •  
      • Fixed a lot of compiler and linter warnings. #1400 #1435 #1502
        •  
      • Reduced required CMake version from 3.8 to 3.1. #1409 #1428 #1441 #1498
        •  
      • Added nodiscard attribute to meta(), array(), object(), from_cbor, from_msgpack, from_ubjson, from_bson, and parse. #1433
        •  
       
      🔨 Further Changes
       
         
      • Added missing headers. #1500
        •  
      • Fixed typos and broken links in README. #1417 #1423 #1425 #1451 #1455 #1491
        •  
      • Fixed documentation of parse function. #1473
        •  
      • Suppressed warning that cannot be fixed inside the library. #1401 #1468
        •  
      • Imroved package manager suppert:
           
        • Updated Buckaroo instructions. #1495
          •  
        • Improved Meson support. #1463
          •  
        • Added Conda package manager documentation. #1430
          •  
        • Added NuGet package manager documentation. #1132
          •  
         
        •  
      • Continuous Integration
           
        • Removed unstable or deprecated Travis builders (Xcode 6.4 - 8.2) and added Xcode 10.1 builder.
          •  
        • Added Clang 7 to Travis CI.
          •  
        • Fixed AppVeyor x64 builds. #1374 #1414
          •  
         
        •  
      • Updated thirdparty libraries:
           
        • Catch 1.12.0 -> 1.12.2
          •  
        • Google Benchmark 1.3.0 -> 1.4.1
          •  
        • Doxygen 1.8.15 -> 1.8.16
          •  
         
        •  
       
      🔥 Deprecated functions
       
      This release does not deprecate any functions. As an overview, the following functions have been deprecated in earlier versions and will be removed in the next major version (i.e., 4.0.0):
        
      v3.5.0
       
       
      Files
        
       
      Release date: 2018-12-22 SHA-256: 8a6dbf3bf01156f438d0ca7e78c2971bca50eec4ca6f0cf59adf3464c43bb9d5 (json.hpp), 3564da9c5b0cf2e032f97c69baedf10ddbc98030c337d0327a215ea72259ea21 (include.zip)
       
      Summary
       
      This release introduces the support for structured bindings and reading from FILE*. Besides, a few bugs have been fixed. All changes are backward-compatible.
       
      ✨ New Features
       
         
      •  
        Structured bindings are now supported for JSON objects and arrays via the items() member function, so finally this code is possible: 
        for (auto& [key, val] : j.items()) {
     std::cout << key << ':' << val << '\n';
 }
 
         #1388 #1391
         
        •  
      •  
        Added support for reading from FILE* to support situations in which streams are nit available or would require too much RAM. #1370 #1392
         
        •  
       
      🐛 Bug Fixes
       
         
      • The eofbit was not set for input streams when the end of a stream was reached while parsing. #1340 #1343
        •  
      • Fixed a bug in the SAX parser for BSON arrays.
        •  
       
      ⚡ Improvements
       
         
      • Added support for Clang 5.0.1 (PS4 version). #1341 #1342
        •  
       
      🔨 Further Changes
       
         
      • Added a warning for implicit conversions to the documentation: It is not recommended to use implicit conversions when reading from a JSON value. Details about this recommendation can be found here. #1363
        •  
      • Fixed typos in the documentation. #1329 #1380 #1382
        •  
      • Fixed a C4800 warning. #1364
        •  
      • Fixed a -Wshadow warning #1346
        •  
      • Wrapped std::snprintf calls to avoid error in MSVC. #1337
        •  
      • Added code to allow installation via Meson. #1345
        •  
       
      🔥 Deprecated functions
       
      This release does not deprecate any functions. As an overview, the following functions have been deprecated in earlier versions and will be removed in the next major version (i.e., 4.0.0):
        
      v3.4.0
       
       
      Files
        
       
      Release date: 2018-10-30 SHA-256: 63da6d1f22b2a7bb9e4ff7d6b255cf691a161ff49532dcc45d398a53e295835f (json.hpp), bfec46fc0cee01c509cf064d2254517e7fa80d1e7647fea37cf81d97c5682bdc (include.zip)
       
      Summary
       
      This release introduces three new features:
       
         
      • BSON (Binary JSON) is next to CBOR, MessagePack, and UBJSON the fourth binary (de)serialization format supported by the library.
        •  
      • Adjustable error handlers for invalid Unicode allows to specify the behavior when invalid byte sequences are serialized.
        •  
      • Simplified enum/JSON mapping with a macro in case the default mapping to integers is not desired.
        •  
       
      Furthermore, some effort has been invested in improving the parse error messages. Besides, a few bugs have been fixed. All changes are backward-compatible.
       
      ✨ New Features
       
         
      • The library can read and write a subset of BSON (Binary JSON). All data types known from JSON are supported, whereas other types more tied to MongoDB such as timestamps, object ids, or binary data are currently not implemented. See the README for examples. #1244 #1320
        •  
      • The behavior when the library encounters an invalid Unicode sequence during serialization can now be controlled by defining one of three Unicode error handlers: (1) throw an exception (default behavior), (2) replace invalid sequences by the Unicode replacement character (U+FFFD), or (3) ignore/filter invalid sequences. See the documentation of the dump function for examples. #1198 #1314
        •  
      • To easily specify a user-defined enum/JSON mapping, a macro NLOHMANN_JSON_SERIALIZE_ENUM has been introduced. See the README section for more information. #1208 #1323
        •  
       
      🐛 Bug Fixes
       
         
      • fixed truncation #1286 #1315
        •  
      • fixed an issue with std::pair #1299 #1301
        •  
      • fixed an issue with std::variant #1292 #1294
        •  
      • fixed a bug in the JSON Pointer parser
        •  
       
      ⚡ Improvements
       
         
      • The diagnosis messages for parse errors have been improved: error messages now indicated line/column positions where possible (in addition to a byte count) and also the context in which the error occurred (e.g., "while parsing a JSON string"). Example: error parse error at 2: syntax error - invalid string: control character must be escaped; last read: '<U+0009>' is now reported as parse error at line 1, column 2: syntax error while parsing value - invalid string: control character U+0009 (HT) must be escaped to \u0009 or \t; last read: '<U+0009>'. #1280 #1288 #1303
        •  
       
      🔨 Further Changes
       
         
      • improved Meson documentation #1305
        •  
      • fixed some more linter warnings #1280
        •  
      • fixed Clang detection for third-party Google Benchmark library #1277
        •  
       
      🔥 Deprecated functions
       
      This release does not deprecate any functions. As an overview, the following functions have been deprecated in earlier versions and will be removed in the next major version (i.e., 4.0.0):
        
      v3.3.0
       
       
      Files
        
       
      Release date: 2018-10-05 SHA-256: f1327bb60c58757a3dd2b0c9c45d49503d571337681d950ec621f8374bcc14d4 (json.hpp), 9588d63557333aaa485e92221ec38014a85a6134e7486fe3441e0541a5a89576 (include.zip)
       
      Summary
       
      This release adds support for GCC 4.8. Furthermore, it adds a function get_to to write a JSON value to a passed reference. Another topic of this release was the CMake support which has been overworked and documented.
       
      Besides, a lot of bugs have been fixed and slight improvements have been made. All changes are backward-compatible.
       
      ✨ New Features
       
         
      • The library can now also built with GCC 4.8. Though this compiler does not fully support C++11, it can successfully compile and run the test suite. Note that bug 57824 in GCC 4.8 still forbids to use multiline raw strings in arguments to macros. #1257
        •  
      • Added new function get_to to write a JSON value to a passed reference. The destination type is automatically derived which allows more succinct code compared to the get function. #1227 #1231
        •  
       
      🐛 Bug Fixes
       
         
      • Fixed a bug in the CMake file that made target_link_libraries to not properly include nlohmann_json. #1243 #1245 #1260
        •  
      • Fixed a warning in MSVC 2017 complaining about a constexpr if. #1204 #1268 #1272
        •  
      • Fixed a bug that prevented compilation with ICPC. #755 #1222
        •  
      • Improved the SFINAE correctness to fix a bug in the conversion operator. #1237 #1238
        •  
      • Fixed a -Wctor-dtor-privacy warning. #1224
        •  
      • Fixed a warning on a lambda in unevaluated context. #1225 #1230
        •  
      • Fixed a bug introduced in version 3.2.0 where defining JSON_CATCH_USER led to duplicate macro definition of JSON_INTERNAL_CATCH. #1213 #1214
        •  
      • Fixed a bug that prevented compilation with Clang 3.4.2 in RHEL 7. #1179 #1249
        •  
       
      ⚡ Improvements
       
         
      • Added documentation on CMake integration of the library. #1270
        •  
      • Changed the CMake file to use find_package(nlohmann_json) without installing the library. #1202
        •  
      • Improved error messages in case operator[] is used with the wrong combination (json.exception.type_error.305) of JSON container type and argument type. Example: "cannot use operator[] with a string argument". #1220 #1221
        •  
      • Added a license and version information to the Meson build file. #1252
        •  
      • Removed static assertions to indicated missing to_json or from_json functions as such assertions do not play well with SFINAE. These assertions also led to problems with GMock. #960 #1212 #1228
        •  
      • The test suite now does not wait forever if run in a wrong directory and input files are not found. #1262
        •  
      • The test suite does not show deprecation warnings for deprecated functions which frequently led to confusion. #1271
        •  
       
      🔨 Further Changes
        
      🔥 Deprecated functions
       
      This release does not deprecate any functions. As an overview, the following functions have been deprecated in earlier versions and will be removed in the next major version (i.e., 4.0.0):
        
      v3.2.0
       
       
      Files
        
       
      Release date: 2018-08-20 SHA-256: ce6b5610a051ec6795fa11c33854abebb086f0fd67c311f5921c3c07f9531b44 (json.hpp), 35ee642558b90e2f9bc758995c4788c4b4d4dec54eef95fb8f38cb4d49c8fc7c (include.zip)
       
      Summary
       
      This release introduces a SAX interface to the library. While this may be a very special feature used by only few people, it allowed to unify all functions that consumed input and created some kind of JSON value. Internally, now all existing functions like parse, accept, from_cbor, from_msgpack, and from_ubjson use the SAX interface with different event processors. This allowed to separate the input processing from the value generation. Furthermore, throwing an exception in case of a parse error is now optional and up to the event processor. Finally, the JSON parser is now non-recursive (meaning it does not use the call stack, but std::vector<bool> to track the hierarchy of structured values) which allows to process nested input more efficiently.
       
      Furthermore, the library finally is able to parse from wide string types. This is the first step toward opening the library from UTF-8 to UTF-16 and UTF-32.
       
      This release further fixes several bugs in the library. All changes are backward-compatible.
       
      ✨ New Features
       
         
      • added a parser with a SAX interface (#971, #1153)
        •  
      • support to parse from wide string types std::wstring, std::u16string, and std::u32string; the input will be converted to UTF-8 (#1031)
        •  
      • added support for std::string_view when using C++17 (#1028)
        •  
      • allow to roundtrip std::map and std::unordered_map from JSON if key type is not convertible to string; in these cases, values are serialized to arrays of pairs (#1079, #1089, #1133, #1138)
        •  
       
      🐛 Bug Fixes
       
         
      • allow to create nullptr_t from JSON allowing to properly roundtrip null values (#1169)
        •  
      • allow compare user-defined string types (#1130)
        •  
      • better support for algorithms using iterators from items() (#1045, #1134)
        •  
      • added parameter to avoid compilation error with MSVC 2015 debug builds (#1114)
        •  
      • re-added accidentally skipped unit tests (#1176)
        •  
      • fixed MSVC issue with std::swap (#1168)
        •  
       
      ⚡ Improvements
       
         
      • key() function for iterators returns a const reference rather than a string copy (#1098)
        •  
      • binary formats CBOR, MessagePack, and UBJSON now supports float as type for floating-point numbers (#1021)
        •  
       
      🔨 Further Changes
       
         
      • changed issue templates
        •  
      • improved continuous integration: added builders for Xcode 9.3 and 9.4, added builders for GCC 8 and Clang 6, added builder for MinGW, added builders for MSVC targeting x86
        •  
      • required CMake version is now at least 3.8 (#1040)
        •  
      • overworked CMake file wrt. packaging (#1048)
        •  
      • added package managers: Spack (#1041) and CocoaPods (#1148)
        •  
      • fixed Meson include directory (#1142)
        •  
      • preprocessor macro JSON_SKIP_UNSUPPORTED_COMPILER_CHECK can skip the rejection of unsupported compilers - use at your own risk! (#1128)
        •  
      • preprocessor macro JSON_INTERNAL_CATCH/JSON_INTERNAL_CATCH_USER allows to control the behavior of exception handling inside the library (#1187)
        •  
      • added note on char to JSON conversion
        •  
      • added note how to send security-related issue via encrypted email
        •  
      • removed dependency to std::stringstream (#1117)
        •  
      • added SPDX-License-Identifier
        •  
      • added updated JSON Parsing Test Suite, described in Parsing JSON is a Minefield 💣
        •  
      • updated to Catch 1.12.0
        •  
       
      🔥 Deprecated functions
       
      This release does not deprecate any functions. As an overview, the following functions have been deprecated in earlier versions and will be removed in the next major version (i.e., 4.0.0):
        
      v3.1.2
       
       
      Files
        
       
      Release date: 2018-03-14 SHA-256: fbdfec4b4cf63b3b565d09f87e6c3c183bdd45c5be1864d3fcb338f6f02c1733 (json.hpp), 495362ee1b9d03d9526ba9ccf1b4a9c37691abe3a642ddbced13e5778c16660c (include.zip)
       
      Summary
       
      This release fixes several bugs in the library. All changes are backward-compatible.
       
      🐛 Bug Fixes
       
         
      • Fixed a memory leak occurring in the parser callback (#1001).
        •  
      • Different specializations of basic_json (e.g., using different template arguments for strings or objects) can now be used in assignments (#972, #977, #986).
        •  
      • Fixed a logical error in an iterator range check (#992).
        •  
       
      ⚡ Improvements
       
         
      • The parser and the serialization now support user-defined string types (#1006, #1009).
        •  
       
      🔨 Further Changes
        
      🔥 Deprecated functions
       
      This release does not deprecate any functions. As an overview, the following functions have been deprecated in earlier versions and will be removed in the next major version (i.e., 4.0.0):
        
      v3.1.1
       
       
      Files
        
       
      Release date: 2018-02-13 SHA-256: e14ce5e33d6a2daf748026bd4947f3d9686ca4cfd53d10c3da46a0a9aceb7f2e (json.hpp), fde771d4b9e4f222965c00758a2bdd627d04fb7b59e09b7f3d1965abdc848505 (include.zip)
       
      Summary
       
      This release fixes several bugs in the library. All changes are backward-compatible.
       
      🐛 Bug Fixes
       
         
      • Fixed parsing of CBOR strings with indefinite length (#961). Earlier versions of this library misinterpreted the CBOR standard and rejected input with the 0x7F start byte.
        •  
      • Fixed user-defined conversion to vector type (#924, #969). A wrong SFINAE check rejected code though a user-defined conversion was provided.
        •  
      • Fixed documentation of the parser behavior for objects with duplicate keys (#963). The exact behavior is not specified by RFC 8259 and the library now also provides no guarantee which object key is stored.
        •  
      • Added check to detect memory overflow when parsing UBJSON containers (#962). The optimized UBJSON format allowed for specifying an array with billions of null elements with a few bytes and the library did not check whether this size exceeded max_size().
        •  
       
      🔨 Further Changes
       
         
      • Code coverage is now calculated for the individual header files, allowing to find uncovered lines more quickly than by browsing through the single header version (#953, #957).
        •  
      • A Makefile target run_benchmarks was added to quickly build and run the benchmark suite.
        •  
      • The documentation was harmonized with respect to the header inclusion (#955). Now all examples and the README use #include <nlohmann/json.hpp> to allow for selecting single_include or include or whatever installation folder as include directory.
        •  
      • Added note on how to use the library with the cget package manager (#954).
        •  
       
      🔥 Deprecated functions
       
      This release does not deprecate any functions. As an overview, the following functions have been deprecated in earlier versions and will be removed in the next major version (i.e., 4.0.0):
        
      v3.1.0
       
       
      Files
        
       
      Release date: 2018-02-01 SHA-256: d40f614d10a6e4e4e80dca9463da905285f20e93116c36d97d4dc1aa63d10ba4 (json.hpp), 2b7234fca394d1e27b7e017117ed80b7518fafbb4f4c13a7c069624f6f924673 (include.zip)
       
      Summary
       
      This release adds support for the UBJSON format and JSON Merge Patch. It also contains some minor changes and bug fixes. All changes are backward-compatible.
       
      ✨ New features
       
         
      • The library now supports UBJSON (Universal Binary JSON Specification) as binary format to read and write JSON values space-efficiently. See the documentation overview for a comparison of the different formats CBOR, MessagePack, and UBJSON.
        •  
      • JSON Merge Patch (RFC 7386) offers an intuitive means to describe patches between JSON values (#876, #877). See the documentation of merge_patch for more information.
        •  
       
      ⚡ Improvements
       
         
      • The library now uses the Grisu2 algorithm for printing floating-point numbers (based on the reference implementation by Florian Loitsch) which produces a short representation which is guaranteed to round-trip (#360, #935, #936).
        •  
      • The UTF-8 handling was further simplified by using the decoder of Björn Hoehrmann in more scenarios.
        •  
       
      🚚 Reorganization
       
         
      • Though the library is released as a single header, its development got more and more complicated. With this release, the header is split into several files and the single-header file json.hpp can be generated from these development sources. In the repository, folder include contains the development sources and single_include contains the single json.hpp header (#700, #906, #907, #910, #911, #915, #920, #924, #925, #928, #944).
        •  
      • The split further allowed for a forward declaration header include/nlohmann/json_fwd.hpp to speed up compilation times (#314).
        •  
       
      🔨 Further changes
       
         
      • Google Benchmark is now used for micro benchmarks (see benchmarks folder, #921).
        •  
      • The serialization (JSON and binary formats) now properly work with the libraries string template parameter, allowing for optimized string implementations to be used in constraint environments such as embedded software (#941, #950).
        •  
      • The exceptional behavior can now be overridden by defining macros JSON_THROW_USER, JSON_TRY_USER, and JSON_CATCH_USER, defining the behavior of throw, try and catch, respectively. This allows to switch off C++'s exception mechanism yet still execute user-defined code in case an error condition occurs (#938).
        •  
      • To facilitate the interplay with flex and Bison, the library does not use the variable name yytext any more as it could clash with macro definitions (#933).
        •  
      • The library now defines NLOHMANN_JSON_VERSION_MAJOR, NLOHMANN_JSON_VERSION_MINOR, and NLOHMANN_JSON_VERSION_PATCH to allow for conditional compilation based on the included library version (#943, #948).
        •  
      • A compilation error with ICC has been fixed (#947).
        •  
      • Typos and links in the documentation have been fixed (#900, #930).
        •  
      • A compiler error related to incomplete types has been fixed (#919).
        •  
      • The tests form the UTF-8 decoder stress test have been added to the test suite.
        •  
       
      🔥 Deprecated functions
       
         
      • Function iterator_wrapper has been deprecated (#874). Since its introduction, the name was up for discussion, as it was too technical. We now introduced the member function items() with the same semantics. iterator_wrapper will be removed in the next major version (i.e., 4.0.0).
        •  
       
      Furthermore, the following functions are deprecated since version 3.0.0 and will be removed in the next major version (i.e., 4.0.0):
        
      Please use friend std::istream& operator>>(std::istream&, basic_json&) and friend operator<<(std::ostream&, const basic_json&) instead.
       
      v3.0.1
       
       
      Files
        
       
      Release date: 2017-12-29 SHA-256: c9b3591f1bb94e723a0cd7be861733a3a555b234ef132be1e9027a0364118c4c
       
      Summary
       
      This release fixes small issues in the implementation of JSON Pointer and JSON Patch. All changes are backward-compatible.
       
      Changes
       
         
      • 🐛 The "copy" operation of JSON Patch (RFC 6902) requests that it is an error if the target path points into a non-existing array or object (see #894 for a detailed description). This release fixes the implementation to detect such invalid target paths and throw an exception.
        •  
      • 🐛 An array index in a JSON Pointer (RFC 6901) must be an integer. This release fixes the implementation to throw an exception in case invalid array indices such as 10e2 are used.
        •  
      • ✅ Added the JSON Patch tests from Byron Ruth and Mike McCabe.
        •  
      • 📝 Fixed the documentation of the at(ptr) function with JSON Pointers to list all possible exceptions (see #888).
        •  
      • 📝 Updated the container overview documentation (see #883).
        •  
      • 🔧 The CMake files now respect the BUILD_TESTING option (see #846, #885)
        •  
      • 🚨 Fixed some compiler warnings (see #858, #882).
        •  
       
      Deprecated functions
       
      🔥 To unify the interfaces and to improve similarity with the STL, the following functions are deprecated since version 3.0.0 and will be removed in the next major version (i.e., 4.0.0):
        
      Please use friend std::istream& operator>>(std::istream&, basic_json&) and friend operator<<(std::ostream&, const basic_json&) instead.
       
      v3.0.0
       
       
      Files
        
       
      Release date: 2017-12-17 SHA-256: 076d4a0cb890a3c3d389c68421a11c3d77c64bd788e85d50f1b77ed252f2a462
       
      Summary
       
       
      After almost a year, here is finally a new release of JSON for Modern C++, and it is a major one! As we adhere to semantic versioning, this means the release includes some breaking changes, so please read the next section carefully before you update. But don't worry, we also added a few new features and put a lot of effort into fixing a lot of bugs and straighten out a few inconsistencies.
       
      💥 Breaking changes
       
      This section describes changes that change the public API of the library and may require changes in code using a previous version of the library. In section "Moving from 2.x.x to 3.0.0" at the end of the release notes, we describe in detail how existing code needs to be changed.
       
         
      • The library now uses user-defined exceptions instead of re-using those defined in <stdexcept> (#244). This not only allows to add more information to the exceptions (every exception now has an identifier, and parse errors contain the position of the error), but also to easily catch all library exceptions with a single catch(json::exception).
        •  
      • When strings with a different encoding as UTF-8 were stored in JSON values, their serialization could not be parsed by the library itself, as only UTF-8 is supported. To enforce this library limitation and improve consistency, non-UTF-8 encoded strings now yield a json::type_error exception during serialization (#838). The check for valid UTF-8 is realized with code from Björn Hoehrmann.
        •  
      • NaN and infinity values can now be stored inside the JSON value without throwing an exception. They are, however, still serialized as null (#388).
        •  
      • The library's iterator tag was changed from RandomAccessIterator to BidirectionalIterator (#593). Supporting RandomAccessIterator was incorrect as it assumed an ordering of values in a JSON objects which are unordered by definition.
        •  
      • The library does not include the standard headers <iostream>, <ctype>, and <stdexcept> any more. You may need to add these headers to code relying on them.
        •  
      • Removed constructor explicit basic_json(std::istream& i, const parser_callback_t cb = nullptr) which was deprecated in version 2.0.0 (#480).
        •  
       
      🔥 Deprecated functions
       
      To unify the interfaces and to improve similarity with the STL, the following functions are now deprecated and will be removed in the next major version (i.e., 4.0.0):
        
      Please use friend std::istream& operator>>(std::istream&, basic_json&) and friend operator<<(std::ostream&, const basic_json&) instead.
       
      ✨ New features
       
      With all this breaking and deprecation out of the way, let's talk about features!
       
         
      • We improved the diagnostic information for syntax errors (#301). Now, an exception json::parse_error is thrown which contains a detailed message on the error, but also a member byte to indicate the byte offset in the input where the error occurred.
        •  
      • We added a non-throwing syntax check (#458): The new accept function returns a Boolean indicating whether the input is proper JSON. We also added a Boolean parameter allow_exceptions to the existing parse functions to return a discarded value in case a syntax error occurs instead of throwing an exception.
        •  
      • An update function was added to merge two JSON objects (#428). In case you are wondering: the name was inspired by Python.
        •  
      • The insert function now also supports an iterator range to add elements to an object.
        •  
      • The binary exchange formats CBOR and MessagePack can now be parsed from input streams and written to output streams (#477).
        •  
      • Input streams are now only read until the end of a JSON value instead of the end of the input (#367).
        •  
      • The serialization function dump now has two optional parameters ensure_ascii to escape all non-ASCII characters with \uxxxx and an indent_char parameter to choose whether to indent with spaces or tabs (#654). 
        •  
      • Added built-in type support for C arrays (#502), std::pair and std::tuple (#563, #614), enum and enum class (#545), std::vector<bool> (#494). Fixed support for std::valarray (#702), std::array (#553), and std::map<std::string, std::string> (#600, #607).
        •  
       
      🔨 Further changes
       
      Furthermore, there have been a lot of changes under the hood:
       
         
      • Replaced the re2c generated scanner by a self-coded version which allows for a better modularization of the parser and better diagnostics. To test the new scanner, we added millions (8,860,608 to be exact) of unit tests to check all valid and invalid byte sequences of the Unicode standard.
        •  
      • Google's OSS-Fuzz is still constantly fuzz-testing the library and found several issues that were fixed in this release (#497, #504, #514, #516, #518, #519, #575).
        •  
      • We now also ignore UTF-8 byte order marks when parsing from an iterator range (#602).
        •  
      • Values can be now moved from initializer lists (#663).
        •  
      • Updated to Catch 1.9.7. Unfortunately, Catch2 currently has some performance issues.
        •  
      • The non-exceptional paths of the library are now annotated with __builtin_expect to optimize branch prediction as long as no error occurs.
        •  
      • MSVC now produces a stack trace in MSVC if a from_json or to_json function was not found for a user-defined type. We also added a debug visualizer nlohmann_json.natvis for better debugging in MSVC (#844).
        •  
      • Overworked the documentation and added even more examples.
        •  
      • The build workflow now relies on CMake and CTest. Special flags can be chosen with CMake, including coverage (JSON_Coverage), compilation without exceptions (JSON_NoExceptions), LLVM sanitizers (JSON_Sanitizer), or execution with Valgrind (JSON_Valgrind).
        •  
      • Added support for package managers Meson (#576), Conan (#566), Hunter (#671, #829), and vcpkg (#753).
        •  
      • Added CI builders: Xcode 8.3, 9.0, 9.1, and 9.2; GCC 7.2; Clang 3.8, 3.9, 4.0, and 5.0; Visual Studio 2017. The library is further built with C++17 settings on the latest Clang, GCC, and MSVC version to quickly detect new issues.
        •  
       
      Moving from 2.x.x to 3.0.0
       
      User-defined Exceptions
       
      There are five different exceptions inheriting from json::exception:
        
      To support these exception, the try/catch blocks of your code need to be adjusted:
       
        
       new exception previous exception 
               
       parse_error.101 invalid_argument 
       
       parse_error.102 invalid_argument 
       
       parse_error.103 invalid_argument 
       
       parse_error.104 invalid_argument 
       
       parse_error.105 invalid_argument 
       
       parse_error.106 domain_error 
       
       parse_error.107 domain_error 
       
       parse_error.108 domain_error 
       
       parse_error.109 invalid_argument 
       
       parse_error.110 out_of_range 
       
       parse_error.111 invalid_argument 
       
       parse_error.112 invalid_argument 
       
       invalid_iterator.201 domain_error 
       
       invalid_iterator.202 domain_error 
       
       invalid_iterator.203 domain_error 
       
       invalid_iterator.204 out_of_range 
       
       invalid_iterator.205 out_of_range 
       
       invalid_iterator.206 domain_error 
       
       invalid_iterator.207 domain_error 
       
       invalid_iterator.208 domain_error 
       
       invalid_iterator.209 domain_error 
       
       invalid_iterator.210 domain_error 
       
       invalid_iterator.211 domain_error 
       
       invalid_iterator.212 domain_error 
       
       invalid_iterator.213 domain_error 
       
       invalid_iterator.214 out_of_range 
       
       type_error.301 domain_error 
       
       type_error.302 domain_error 
       
       type_error.303 domain_error 
       
       type_error.304 domain_error 
       
       type_error.305 domain_error 
       
       type_error.306 domain_error 
       
       type_error.307 domain_error 
       
       type_error.308 domain_error 
       
       type_error.309 domain_error 
       
       type_error.310 domain_error 
       
       type_error.311 domain_error 
       
       type_error.313 domain_error 
       
       type_error.314 domain_error 
       
       type_error.315 domain_error 
       
       out_of_range.401 out_of_range 
       
       out_of_range.402 out_of_range 
       
       out_of_range.403 out_of_range 
       
       out_of_range.404 out_of_range 
       
       out_of_range.405 domain_error 
       
       other_error.501 domain_error 
              
       
      Handling of NaN and INF
       
         
      •  
        If an overflow occurs during parsing a number from a JSON text, an exception json::out_of_range is thrown so that the overflow is detected early and roundtripping is guaranteed.
         
        •  
      •  
        NaN and INF floating-point values can be stored in a JSON value and are not replaced by null. That is, the basic_json class behaves like double in this regard (no exception occurs). However, NaN and INF are serialized to null.
         
        •  
       
      Removal of deprecated functions
       
      Function explicit basic_json(std::istream& i, const parser_callback_t cb = nullptr) should be replaced by the parse function: Let ss be a stream and cb be a parse callback function.
       
      Old code:
       
      json j(ss, cb);
@@ -7,4 +7,4 @@
 j << ss;
 
       
      or
       
      json j;
 ss >> j;
-
       
      v2.1.1
       
       
      Files
        
       
      Release date: 2017-02-25 SHA-256: faa2321beb1aa7416d035e7417fcfa59692ac3d8c202728f9bcc302e2d558f57
       
      Summary
       
      This release fixes a locale-related bug in the parser. To do so, the whole number handling (lexer, parser, and also the serialization) have been overworked. Furthermore, a lot of small changes added up that were added to this release. All changes are backward-compatible.
       
      Changes
       
         
      • 🐛 Locales that have a different character than . as decimal separator (e.g., the Norwegian locale nb_NO.UTF-8) led to truncated number parsing or parse errors. The library now has been fixed to work with any locale. Note that . is still the only valid decimal separator for JSON input.
        •  
      • 🐛 Numbers like 1.0 were correctly parsed as floating-point number, but serialized as integer (1). Now, floating-point numbers correctly round trip.
        •  
      • 🐛 Parsing incorrect JSON numbers with leading 0 (0123) could yield a buffer overflow. This is fixed now by detecting such errors directly by the lexer.
        •  
      • 🐛 Constructing a JSON value from a pointer was incorrectly interpreted as a Boolean; such code will now yield a compiler error.
        •  
      • 🐛 Comparing a JSON number with 0 led to a comparison with null. This is fixed now.
        •  
      • 🐛 All throw calls are now wrapped in macros.
        •  
      • 🔒 Starting during the preparation of this release (since 8 February 2017), commits and released files are cryptographically signed with this GPG key. Previous releases have also been signed.
        •  
      • ✨ The parser for MessagePack and CBOR now supports an optional start index parameter to define a byte offset for the parser.
        •  
      • 🚨 Some more warnings have been fixed. With Clang, the code compiles without warnings with -Weverything (well, it needs -Wno-documentation-unknown-command and -Wno-deprecated-declarations, but you get the point).
        •  
      • 🔨 The code can be compiled easier with many Android NDKs by avoiding macros like UINT8_MAX which previously required defining a preprocessor macro for compilation.
        •  
      • ⚡ The unit tests now compile two times faster.
        •  
      • ➕ Cotire is used to speed up the build.
        •  
      • ✏ Fixed a lot of typos in the documentation.
        •  
      • 📝 Added a section to the README file that lists all used third-party code/tools.
        •  
      • 📝 Added a note on constructing a string value vs. parsing.
        •  
      • ✅ The test suite now contains 11202597 unit tests.
        •  
      • 📝 Improved the Doxygen documentation by shortening the template parameters of class basic_json.
        •  
      • 👷 Removed Doozer.
        •  
      • 👷 Added Codacity.
        •  
      • ⬆ Upgraded Catch to version 1.7.2.
        •  
       
      v2.1.0
       
       
      Files
        
       
         
      • Release date: 2017-01-28
        •  
      • SHA-256: a571dee92515b685784fd527e38405cf3f5e13e96edbfe3f03d6df2e363a767b
        •  
       
      Summary
       
      This release introduces a means to convert from/to user-defined types. The release is backwards compatible.
       
      conversion
       
      Changes
       
         
      • ✨ The library now offers an elegant way to convert from and to arbitrary value types. All you need to do is to implement two functions: to_json and from_json. Then, a conversion is as simple as putting a = between variables. See the README for more information and examples.
        •  
      • ✨ Exceptions can now be switched off. This can be done by defining the preprocessor symbol JSON_NOEXCEPTION or by passing -fno-exceptions to your compiler. In case the code would usually thrown an exception, abort() is now called.
        •  
      • ✨ Information on the library can be queried with the new (static) function meta() which returns a JSON object with information on the version, compiler, and platform. See the documentation for an example.
        •  
      • 🐛 A bug in the CBOR parser was fixed which led to a buffer overflow.
        •  
      • ✨ The function type_name() is now public. It allows to query the type of a JSON value as string.
        •  
      • ✅ Added the Big List of Naughty Strings as test case.
        •  
      • ⬆ Updated to Catch v1.6.0.
        •  
      • 📝 Some typos in the documentation have been fixed.
        •  
       
      v2.0.10
       
       
      Files
        
       
         
      • Release date: 2017-01-02
        •  
      • SHA-256: ec27d4e74e9ce0f78066389a70724afd07f10761009322dc020656704ad5296d
        •  
       
      Summary
       
      This release fixes several security-relevant bugs in the MessagePack and CBOR parsers. The fixes are backwards compatible.
       
      Changes
       
         
      • 🐛 Fixed a lot of bugs in the CBOR and MesssagePack parsers. These bugs occurred if invalid input was parsed and then could lead in buffer overflows. These bugs were found with Google's OSS-Fuzz, see #405, #407, #408, #409, #411, and #412 for more information.
        •  
      • 👷 We now also use the Doozer continuous integration platform.
        •  
      • 👷 The complete test suite is now also run with Clang's address sanitizer and undefined-behavior sanitizer.
        •  
      • ✅ Overworked fuzz testing; CBOR and MessagePack implementations are now fuzz-tested. Furthermore, all fuzz tests now include a round trip which ensures created output can again be properly parsed and yields the same JSON value.
        •  
      • 📝 Clarified documentation of find() function to always return end() when called on non-object value types.
        •  
      • 🔨 Moved thirdparty test code to test/thirdparty directory.
        •  
       
      v2.0.9
       
       
      Files
        
       
         
      • Release date: 2016-12-16
        •  
      • SHA-256: fbf3396f13e187d6c214c297bddc742d918ea9b55e10bfb3d9f458b9bfdc22e5
        •  
       
      Summary
       
      This release implements with CBOR and MessagePack two binary serialization/deserialization formats. It further contains some small fixes and improvements. The fixes are backwards compatible.
       
      cbor
       
      Changes
       
         
      • ✨ The library can now read and write the binary formats CBOR (Concise Binary Object Representation) and MessagePack. Both formats are aimed to produce a very compact representation of JSON which can be parsed very efficiently. See the README file for more information and examples.
        •  
      • 🔥 simplified the iteration implementation allowing to remove dozens of lines of code
        •  
      • 🐛 fixed an integer overflow error detected by Google's OSS-Fuzz
        •  
      • 🐛 suppressed documentation warnings inside the library to facilitate compilation with -Wdocumentation
        •  
      • 🐛 fixed an overflow detection error in the number parser
        •  
      • 📝 updated contribution guidelines to a list of frequentely asked features that will most likely be never added to the library
        •  
      • 📝 added a table of contents to the README file to add some structure
        •  
      • 📝 mentioned the many examples and the documentation in the README file
        •  
      • 🔨 split unit tests into individual independent binaries to speed up compilation and testing
        •  
      • ✅ the test suite now contains 11201886 tests
        •  
       
      v2.0.8
       
       
      Files
        
       
         
      • Release date: 2016-12-02
        •  
      • SHA-256: b70db0ad34f8e0e61dc3f0cbab88099336c9674c193d8a3439d93d6aca2d7120
        •  
       
      Summary
       
      This release combines a lot of small fixes and improvements. The fixes are backwards compatible.
       
      Changes
       
         
      • 🐛 fixed a bug that froze the parser if a passed file was not found (now, std::invalid_argument is thrown)
        •  
      • 🐛 fixed a bug that lead to an error of a file at EOF was parsed again (now, std::invalid_argument is thrown)
        •  
      • ✨ the well known functions emplace and emplace_back have been added to JSON values and work as expected
        •  
      • ⚡ improved the performance of the serialization (dump function)
        •  
      • ⚡ improved the performance of the deserialization (parser)
        •  
      • 👷 some continuous integration images at Travis were added and retired; see here for the current continuous integration setup
        •  
      • 👷 the Coverity scan works again
        •  
      • 📈 the benchmarking code has been improved to produce more stable results
        •  
      • 📝 the README file has been extended and includes more frequently asked examples
        •  
      • ✅ the test suite now contains 8905518 tests
        •  
      • ⬆ updated Catch to version 1.5.8
        •  
       
      v2.0.7
       
       
      Files
        
       
         
      • Release date: 2016-11-02
        •  
      • SHA-256: 5545c323670f8165bae90b9dc6078825e86ec310d96cc4e5b47233ea43715bbf
        •  
       
      Summary
       
      This release fixes a few bugs in the JSON parser found in the Parsing JSON is a Minefield 💣 article. The fixes are backwards compatible.
       
      Changes
       
         
      • The article Parsing JSON is a Minefield 💣 discusses a lot of pitfalls of the JSON specification. When investigating the published test cases, a few bugs in the library were found and fixed:
        •  
      • Files with less than 5 bytes can now be parsed without error.
        •  
      • The library now properly rejects any file encoding other than UTF-8. Furthermore, incorrect surrogate pairs are properly detected and rejected.
        •  
      • The library now accepts all but one "yes" test (y_string_utf16.json): UTF-16 is not supported.
        •  
      • The library rejects all but one "no" test (n_number_then_00.json): Null bytes are treated as end of file instead of an error. This allows to parse input from null-terminated strings.
        •  
      • The string length passed to a user-defined string literal is now exploited to choose a more efficient constructor.
        •  
      • A few grammar mistakes in the README file have been fixed.
        •  
       
      v2.0.6
       
       
      Files
        
       
         
      • Release date: 2016-10-15
        •  
      • SHA256: 459cc93d5e2f503e50c6d5876eb86bfea7daf405f5a567c5a2c9abc2383756ae
        •  
       
      Summary
       
      This release fixes the semantics of operator[] for JSON Pointers (see below). This fix is backwards compatible.
       
      Changes
       
         
      • operator[] for JSON Pointers now behaves like the other versions of operator[] and transforms null values into objects or arrays if required. This allows to created nested structures like j["/foo/bar/2"] = 17 (yielding {"foo": "bar": [null, null, 17]}) without problems.
        •  
      • overworked a helper SFINAE function
        •  
      • fixed some documentation issues
        •  
      • fixed the CMake files to allow to run the test suite outside the main project directory
        •  
      • restored test coverage to 100%.
        •  
       
      v2.0.5
       
       
      Files
        
       
         
      • Release date: 2016-09-14
        •  
      • SHA-256: 8b7565263a44e2b7d3b89808bc73d2d639037ff0c1f379e3d56dbd77e00b98d9
        •  
       
      Summary
       
      This release fixes a regression bug in the stream parser (function parse() and the <</>> operators). This fix is backwards compatible.
       
      Changes
       
         
      • Bug fix: The end of a file stream was not detected properly which led to parse errors. This bug should have been fixed with 2.0.4, but there was still a flaw in the code.
        •  
       
      v2.0.4
       
       
      Files
        
       
         
      • Release date: 2016-09-11
        •  
      • SHA-256: 632ceec4c25c4e2153f71470d3a2b992c8355f6d8b4d627d05dd16095cd3aeda
        •  
       
      Summary
       
      This release fixes a bug in the stream parser (function parse() and the <</>> operators). This fix is backwards compatible.
       
      Changes
       
         
      • Bug fix: The end of a file stream was not detected properly which led to parse errors.
        •  
      • Fixed a compiler warning about an unused variable.
        •  
       
      v2.0.3
       
       
      Files
        
       
         
      • Release date: 2016-08-31
        •  
      • SHA-256: 535b73efe5546fde9e763c14aeadfc7b58183c0b3cd43c29741025aba6cf6bd3
        •  
       
      Summary
       
      This release combines a lot of small fixes and improvements. The release is backwards compatible.
       
      Changes
       
         
      • The parser/deserialization functions have been generalized to process any contiguous sequence of 1-byte elements (e.g., char, unsigned char, uint8_t). This includes all kind of string representations (string literals, char arrays, std::string, const char*), contiguous containers (C-style arrays, std::vector, std::array, std::valarray, std::initializer_list). User-defined containers providing random-access iterator access via std::begin and std::end can be used as well. See the documentation (1, 2, 3, 4) for more information. Note that contiguous storage cannot be checked at compile time; if any of the parse functions are called with a noncompliant container, the behavior is undefined and will most likely yield segmentation violation. The preconditions are enforced by an assertion unless the library is compiled with preprocessor symbol NDEBUG.
        •  
      • As a general remark on assertions: The library uses assertions to preclude undefined behavior. A prominent example for this is the operator[] for const JSON objects. The behavior of this const version of the operator is undefined if the given key does not exist in the JSON object, because unlike the non-const version, it cannot add a null value at the given key. Assertions can be switched of by defining the preprocessor symbol NDEBUG. See the documentation of assert for more information.
        •  
      • In the course of cleaning up the parser/deserialization functions, the constructor basic_json(std::istream&, const parser_callback_t) has been deprecated and will be deleted with the next major release 3.0.0 to unify the interface of the library. Deserialization will be done by stream operators or by calling one of the parse functions. That is, calls like json j(i); for an input stream i need to be replaced by json j = json::parse(i);. Compilers will produce a deprecation warning if client code uses this function.
        •  
      • Minor improvements:
        •  
      • Improved the performance of the serialization by avoiding the re-creation of a locale object.
        •  
      • Fixed two MSVC warnings. Compiling the test suite with /Wall now only warns about non-inlined functions (C4710) and the deprecation of the constructor from input-stream (C4996).
        •  
      • Some project internals:
        •  
      •  The project has qualified for the Core Infrastructure Initiative Best Practices Badge. While most requirements where already satisfied, some led to more explicit documentation of quality-ensuring procedures. For instance, static analysis is now executed with every commit on the build server. Furthermore, the contribution guidelines document how to communicate security issues privately.
        •  
      • The test suite has been overworked and split into several files to allow for faster compilation and analysis. The execute the test suite, simply execute make check.
        •  
      • The continuous integration with Travis was extended with Clang versions 3.6.0 to 3.8.1 and now includes 18 different compiler/OS combinations.
        •  
      • An 11-day run of American fuzzy lop checked 962 million inputs on the parser and found no issue.
        •  
       
      v2.0.2
       
       
      Files
        
       
         
      • Release date: 2016-07-31
        •  
      • SHA-256: 8e97b7965b4594b00998d6704465412360e1a0ed927badb51ded8b82291a8f3d
        •  
       
      Summary
       
      This release combines a lot of small fixes and improvements. The release is backwards compatible.
       
      Changes
       
         
      • The parser has been overworked, and a lot of small issues have been fixed:
        •  
      • Improved parser performance by avoiding recursion and using move semantics for the return value.
        •  
      • Unescaped control characters \x10-\x1f are not accepted any more.
        •  
      • Fixed a bug in the parser when reading from an input stream.
        •  
      • Improved test case coverage for UTF-8 parsing: now, all valid Unicode code points are tested both escaped and unescaped.
        •  
      • The precision of output streams is now preserved by the parser.
        •  
      • Started to check the code correctness by proving termination of important loops. Furthermore, individual assertions have been replaced by a more systematic function which checks the class invariants. Note that assertions should be switched off in production by defining the preprocessor macro NDEBUG, see the documentation of assert.
        •  
      • A lot of code cleanup: removed unused headers, fixed some compiler warnings, and fixed a build error for Windows-based Clang builds.
        •  
      • Added some compile-time checks:
        •  
      • Unsupported compilers are rejected during compilation with an #error command.
        •  
      • Static assertion prohibits code with incompatible pointer types used in get_ptr().
        •  
      • Improved the documentation, and adjusted the documentation script to choose the correct version of sed.
        •  
      • Replaced a lot of "raw loops" by STL functions like std::all_of, std::for_each, or std::accumulate. This facilitates reasoning about termination of loops and sometimes allowed to simplify functions to a single return statement.
        •  
      • Implemented a value() function for JSON pointers (similar to at function).
        •  
      • The Homebrew formula (see Integration) is now tested for all Xcode builds (6.1 - 8.x) with Travis.
        •  
      • Avoided output to std::cout in the test cases.
        •  
       
      v2.0.1
       
       
      Files
        
       
         
      • Release date: 2016-06-28
        •  
      • SHA-256: ef550fcd7df572555bf068e9ec4e9d3b9e4cdd441cecb0dcea9ea7fd313f72dd
        •  
       
      Summary
       
      This release fixes a performance regression in the JSON serialization (function dump()). This fix is backwards compatible.
       
      Changes
       
         
      • The locale of the output stream (or the internal string stream if a JSON value is serialized to a string) is now adjusted once for the whole serialization instead of for each floating-point number.
        •  
      • The locale of an output stream is now correctly reset to the previous value by the JSON library.
        •  
       
      v2.0.0
       
       
      Files
        
       
         
      • Release date: 2016-06-24
        •  
      • SHA-256: ac9e1fb25c2ac9ca5fc501fcd2fe3281fe04f07018a1b48820e7b1b11491bb6c
        •  
       
      Summary
       
      This release adds several features such as JSON Pointers, JSON Patch, or support for 64 bit unsigned integers. Furthermore, several (subtle) bugs have been fixed.
       
      As noexcept and constexpr specifier have been added to several functions, the public API has effectively been changed in a (potential) non-backwards compatible manner. As we adhere to Semantic Versioning, this calls for a new major version, so say hello to 2️⃣.0️⃣.0️⃣.
       
      Changes
       
         
      • 🔟 A JSON value now uses uint64_t (default value for template parameter NumberUnsignedType) as data type for unsigned integer values. This type is used automatically when an unsigned number is parsed. Furthermore, constructors, conversion operators and an is_number_unsigned() test have been added.
        •  
      • 👉 JSON Pointer (RFC 6901) support: A JSON Pointer is a string (similar to an XPath expression) to address a value inside a structured JSON value. JSON Pointers can be used in at() and operator[] functions. Furthermore, JSON values can be “flattened” to key/value pairs using flatten() where each key is a JSON Pointer. The original value can be restored by “unflattening” the flattened value using unflatten().
        •  
      • 🏥 JSON Patch (RFC 6902) support. A JSON Patch is a JSON value that describes the required edit operations (add, change, remove, …) to transform a JSON value into another one. A JSON Patch can be created with function diff(const basic_json&) and applied with patch(const basic_json&). Note the created patches use a rather primitive algorithm so far and leave room for improvement.
        •  
      • 🇪🇺 The code is now locale-independent: Floating-point numbers are always serialized with a period (.) as decimal separator and ignores different settings from the locale.
        •  
      • 🍺 Homebrew support: Install the library with brew tap nlohmann/json && brew install nlohmann_json.
        •  
      • Added constructor to create a JSON value by parsing a std::istream (e.g., std::stringstream or std::ifstream).
        •  
      • Added noexcept specifier to basic_json(boolean_t), basic_json(const number_integer_t), basic_json(const int), basic_json(const number_float_t), iterator functions (begin(), end(), etc.)
        •  
      • When parsing numbers, the sign of 0.0 (vs. -0.0) is preserved.
        •  
      • Improved MSVC 2015, Android, and MinGW support. See README for more information.
        •  
      • Improved test coverage (added 2,225,386 tests).
        •  
      • Removed some misuses of std::move.
        •  
      • Fixed several compiler warnings.
        •  
      • Improved error messages from JSON parser.
        •  
      • Updated to re2c to version 0.16 to use a minimal DFAs for the lexer.
        •  
      • Updated test suite to use Catch version 1.5.6.
        •  
      • Made type getters (is_number, etc.) and const value access constexpr.
        •  
      • Functions push_back and operator+= now work with key/value pairs passed as initializer list, e.g. j_object += {"key", 1}.
        •  
      • Overworked CMakeLists.txt to make it easier to integrate the library into other projects.
        •  
       
      Notes
       
         
      • Parser error messages are still very vague and contain no information on the error location.
        •  
      • The implemented diff function is rather primitive and does not create minimal diffs.
        •  
      • The name of function iteration_wrapper may change in the future and the function will be deprecated in the next release.
        •  
      • Roundtripping (i.e., parsing a JSON value from a string, serializing it, and comparing the strings) of floating-point numbers is not 100% accurate. Note that RFC 8259 defines no format to internally represent numbers and states not requirement for roundtripping. Nevertheless, benchmarks like Native JSON Benchmark treat roundtripping deviations as conformance errors.
        •  
       
      v1.1.0
       
       
      Files
        
       
         
      • Release date: 2016-01-24
        •  
      • SHA-256: c0cf0e3017798ca6bb18e757ebc570d21a3bdac877845e2b9e9573d183ed2f05
        •  
       
      Summary
       
      This release fixes several small bugs and adds functionality in a backwards-compatible manner. Compared to the last version (1.0.0), the following changes have been made:
       
      Changes
       
         
      • Fixed: Floating-point numbers are now serialized and deserialized properly such that rountripping works in more cases. [#185, #186, #190, #191, #194]
        •  
      • Added: The code now contains assertions to detect undefined behavior during development. As the standard function assert is used, the assertions can be switched off by defining the preprocessor symbol NDEBUG during compilation. [#168]
        •  
      • Added: It is now possible to get a reference to the stored values via the newly added function get_ref(). [#128, #184]
        •  
      • Fixed: Access to object values via keys (operator[]) now works with all kind of string representations. [#171, #189]
        •  
      • Fixed: The code now compiles again with Microsoft Visual Studio 2015. [#144, #167, #188]
        •  
      • Fixed: All required headers are now included.
        •  
      • Fixed: Typos and other small issues. [#162, #166, #175, #177, #179, #180]
        •  
       
      Notes
       
      There are still known open issues (#178, #187) which will be fixed in version 2.0.0. However, these fixes will require a small API change and will not be entirely backwards-compatible.
       
      v1.0.0
       
       
      Files
        
       
         
      • Release date: 2015-12-28
        •  
      • SHA-256: 767dc2fab1819d7b9e19b6e456d61e38d21ef7182606ecf01516e3f5230446de
        •  
       
      Summary
       
      This is the first official release. Compared to the prerelease version 1.0.0-rc1, only a few minor improvements have been made:
       
      Changes
       
         
      • Changed: A UTF-8 byte order mark is silently ignored.
        •  
      • Changed: sprintf is no longer used.
        •  
      • Changed: iterator_wrapper also works for const objects; note: the name may change!
        •  
      • Changed: Error messages during deserialization have been improved.
        •  
      • Added: The parse function now also works with type std::istream&&.
        •  
      • Added: Function value(key, default_value) returns either a copy of an object's element at the specified key or a given default value if no element with the key exists.
        •  
      • Added: Public functions are tagged with the version they were introduced. This shall allow for better versioning in the future.
        •  
      • Added: All public functions and types are documented (see http://nlohmann.github.io/json/doxygen/) including executable examples.
        •  
      • Added: Allocation of all types (in particular arrays, strings, and objects) is now exception-safe.
        •  
      • Added: They descriptions of thrown exceptions have been overworked and are part of the tests suite and documentation.
        •  
         
       
         
        
       
       
       
       
       
       Copyright © 2013-2025 Niels Lohmann 
       
       
                   
       
       
       
       
       
       
       
           
\ No newline at end of file
+

      v2.1.1

      Files

      Release date: 2017-02-25 SHA-256: faa2321beb1aa7416d035e7417fcfa59692ac3d8c202728f9bcc302e2d558f57

      Summary

      This release fixes a locale-related bug in the parser. To do so, the whole number handling (lexer, parser, and also the serialization) have been overworked. Furthermore, a lot of small changes added up that were added to this release. All changes are backward-compatible.

      Changes

      • 🐛 Locales that have a different character than . as decimal separator (e.g., the Norwegian locale nb_NO.UTF-8) led to truncated number parsing or parse errors. The library now has been fixed to work with any locale. Note that . is still the only valid decimal separator for JSON input.
      • 🐛 Numbers like 1.0 were correctly parsed as floating-point number, but serialized as integer (1). Now, floating-point numbers correctly round trip.
      • 🐛 Parsing incorrect JSON numbers with leading 0 (0123) could yield a buffer overflow. This is fixed now by detecting such errors directly by the lexer.
      • 🐛 Constructing a JSON value from a pointer was incorrectly interpreted as a Boolean; such code will now yield a compiler error.
      • 🐛 Comparing a JSON number with 0 led to a comparison with null. This is fixed now.
      • 🐛 All throw calls are now wrapped in macros.
      • 🔒 Starting during the preparation of this release (since 8 February 2017), commits and released files are cryptographically signed with this GPG key. Previous releases have also been signed.
      • ✨ The parser for MessagePack and CBOR now supports an optional start index parameter to define a byte offset for the parser.
      • 🚨 Some more warnings have been fixed. With Clang, the code compiles without warnings with -Weverything (well, it needs -Wno-documentation-unknown-command and -Wno-deprecated-declarations, but you get the point).
      • 🔨 The code can be compiled easier with many Android NDKs by avoiding macros like UINT8_MAX which previously required defining a preprocessor macro for compilation.
      • ⚡ The unit tests now compile two times faster.
      • ➕ Cotire is used to speed up the build.
      • ✏ Fixed a lot of typos in the documentation.
      • 📝 Added a section to the README file that lists all used third-party code/tools.
      • 📝 Added a note on constructing a string value vs. parsing.
      • ✅ The test suite now contains 11202597 unit tests.
      • 📝 Improved the Doxygen documentation by shortening the template parameters of class basic_json.
      • 👷 Removed Doozer.
      • 👷 Added Codacity.
      • ⬆ Upgraded Catch to version 1.7.2.

      v2.1.0

      Files

      • Release date: 2017-01-28
      • SHA-256: a571dee92515b685784fd527e38405cf3f5e13e96edbfe3f03d6df2e363a767b

      Summary

      This release introduces a means to convert from/to user-defined types. The release is backwards compatible.

      conversion

      Changes

      • ✨ The library now offers an elegant way to convert from and to arbitrary value types. All you need to do is to implement two functions: to_json and from_json. Then, a conversion is as simple as putting a = between variables. See the README for more information and examples.
      • ✨ Exceptions can now be switched off. This can be done by defining the preprocessor symbol JSON_NOEXCEPTION or by passing -fno-exceptions to your compiler. In case the code would usually thrown an exception, abort() is now called.
      • ✨ Information on the library can be queried with the new (static) function meta() which returns a JSON object with information on the version, compiler, and platform. See the documentation for an example.
      • 🐛 A bug in the CBOR parser was fixed which led to a buffer overflow.
      • ✨ The function type_name() is now public. It allows to query the type of a JSON value as string.
      • ✅ Added the Big List of Naughty Strings as test case.
      • ⬆ Updated to Catch v1.6.0.
      • 📝 Some typos in the documentation have been fixed.

      v2.0.10

      Files

      • Release date: 2017-01-02
      • SHA-256: ec27d4e74e9ce0f78066389a70724afd07f10761009322dc020656704ad5296d

      Summary

      This release fixes several security-relevant bugs in the MessagePack and CBOR parsers. The fixes are backwards compatible.

      Changes

      • 🐛 Fixed a lot of bugs in the CBOR and MesssagePack parsers. These bugs occurred if invalid input was parsed and then could lead in buffer overflows. These bugs were found with Google's OSS-Fuzz, see #405, #407, #408, #409, #411, and #412 for more information.
      • 👷 We now also use the Doozer continuous integration platform.
      • 👷 The complete test suite is now also run with Clang's address sanitizer and undefined-behavior sanitizer.
      • ✅ Overworked fuzz testing; CBOR and MessagePack implementations are now fuzz-tested. Furthermore, all fuzz tests now include a round trip which ensures created output can again be properly parsed and yields the same JSON value.
      • 📝 Clarified documentation of find() function to always return end() when called on non-object value types.
      • 🔨 Moved thirdparty test code to test/thirdparty directory.

      v2.0.9

      Files

      • Release date: 2016-12-16
      • SHA-256: fbf3396f13e187d6c214c297bddc742d918ea9b55e10bfb3d9f458b9bfdc22e5

      Summary

      This release implements with CBOR and MessagePack two binary serialization/deserialization formats. It further contains some small fixes and improvements. The fixes are backwards compatible.

      cbor

      Changes

      • ✨ The library can now read and write the binary formats CBOR (Concise Binary Object Representation) and MessagePack. Both formats are aimed to produce a very compact representation of JSON which can be parsed very efficiently. See the README file for more information and examples.
      • 🔥 simplified the iteration implementation allowing to remove dozens of lines of code
      • 🐛 fixed an integer overflow error detected by Google's OSS-Fuzz
      • 🐛 suppressed documentation warnings inside the library to facilitate compilation with -Wdocumentation
      • 🐛 fixed an overflow detection error in the number parser
      • 📝 updated contribution guidelines to a list of frequentely asked features that will most likely be never added to the library
      • 📝 added a table of contents to the README file to add some structure
      • 📝 mentioned the many examples and the documentation in the README file
      • 🔨 split unit tests into individual independent binaries to speed up compilation and testing
      • ✅ the test suite now contains 11201886 tests

      v2.0.8

      Files

      • Release date: 2016-12-02
      • SHA-256: b70db0ad34f8e0e61dc3f0cbab88099336c9674c193d8a3439d93d6aca2d7120

      Summary

      This release combines a lot of small fixes and improvements. The fixes are backwards compatible.

      Changes

      • 🐛 fixed a bug that froze the parser if a passed file was not found (now, std::invalid_argument is thrown)
      • 🐛 fixed a bug that lead to an error of a file at EOF was parsed again (now, std::invalid_argument is thrown)
      • ✨ the well known functions emplace and emplace_back have been added to JSON values and work as expected
      • ⚡ improved the performance of the serialization (dump function)
      • ⚡ improved the performance of the deserialization (parser)
      • 👷 some continuous integration images at Travis were added and retired; see here for the current continuous integration setup
      • 👷 the Coverity scan works again
      • 📈 the benchmarking code has been improved to produce more stable results
      • 📝 the README file has been extended and includes more frequently asked examples
      • ✅ the test suite now contains 8905518 tests
      • ⬆ updated Catch to version 1.5.8

      v2.0.7

      Files

      • Release date: 2016-11-02
      • SHA-256: 5545c323670f8165bae90b9dc6078825e86ec310d96cc4e5b47233ea43715bbf

      Summary

      This release fixes a few bugs in the JSON parser found in the Parsing JSON is a Minefield 💣 article. The fixes are backwards compatible.

      Changes

      • The article Parsing JSON is a Minefield 💣 discusses a lot of pitfalls of the JSON specification. When investigating the published test cases, a few bugs in the library were found and fixed:
      • Files with less than 5 bytes can now be parsed without error.
      • The library now properly rejects any file encoding other than UTF-8. Furthermore, incorrect surrogate pairs are properly detected and rejected.
      • The library now accepts all but one "yes" test (y_string_utf16.json): UTF-16 is not supported.
      • The library rejects all but one "no" test (n_number_then_00.json): Null bytes are treated as end of file instead of an error. This allows to parse input from null-terminated strings.
      • The string length passed to a user-defined string literal is now exploited to choose a more efficient constructor.
      • A few grammar mistakes in the README file have been fixed.

      v2.0.6

      Files

      • Release date: 2016-10-15
      • SHA256: 459cc93d5e2f503e50c6d5876eb86bfea7daf405f5a567c5a2c9abc2383756ae

      Summary

      This release fixes the semantics of operator[] for JSON Pointers (see below). This fix is backwards compatible.

      Changes

      • operator[] for JSON Pointers now behaves like the other versions of operator[] and transforms null values into objects or arrays if required. This allows to created nested structures like j["/foo/bar/2"] = 17 (yielding {"foo": "bar": [null, null, 17]}) without problems.
      • overworked a helper SFINAE function
      • fixed some documentation issues
      • fixed the CMake files to allow to run the test suite outside the main project directory
      • restored test coverage to 100%.

      v2.0.5

      Files

      • Release date: 2016-09-14
      • SHA-256: 8b7565263a44e2b7d3b89808bc73d2d639037ff0c1f379e3d56dbd77e00b98d9

      Summary

      This release fixes a regression bug in the stream parser (function parse() and the <</>> operators). This fix is backwards compatible.

      Changes

      • Bug fix: The end of a file stream was not detected properly which led to parse errors. This bug should have been fixed with 2.0.4, but there was still a flaw in the code.

      v2.0.4

      Files

      • Release date: 2016-09-11
      • SHA-256: 632ceec4c25c4e2153f71470d3a2b992c8355f6d8b4d627d05dd16095cd3aeda

      Summary

      This release fixes a bug in the stream parser (function parse() and the <</>> operators). This fix is backwards compatible.

      Changes

      • Bug fix: The end of a file stream was not detected properly which led to parse errors.
      • Fixed a compiler warning about an unused variable.

      v2.0.3

      Files

      • Release date: 2016-08-31
      • SHA-256: 535b73efe5546fde9e763c14aeadfc7b58183c0b3cd43c29741025aba6cf6bd3

      Summary

      This release combines a lot of small fixes and improvements. The release is backwards compatible.

      Changes

      • The parser/deserialization functions have been generalized to process any contiguous sequence of 1-byte elements (e.g., char, unsigned char, uint8_t). This includes all kind of string representations (string literals, char arrays, std::string, const char*), contiguous containers (C-style arrays, std::vector, std::array, std::valarray, std::initializer_list). User-defined containers providing random-access iterator access via std::begin and std::end can be used as well. See the documentation (1, 2, 3, 4) for more information. Note that contiguous storage cannot be checked at compile time; if any of the parse functions are called with a noncompliant container, the behavior is undefined and will most likely yield segmentation violation. The preconditions are enforced by an assertion unless the library is compiled with preprocessor symbol NDEBUG.
      • As a general remark on assertions: The library uses assertions to preclude undefined behavior. A prominent example for this is the operator[] for const JSON objects. The behavior of this const version of the operator is undefined if the given key does not exist in the JSON object, because unlike the non-const version, it cannot add a null value at the given key. Assertions can be switched of by defining the preprocessor symbol NDEBUG. See the documentation of assert for more information.
      • In the course of cleaning up the parser/deserialization functions, the constructor basic_json(std::istream&, const parser_callback_t) has been deprecated and will be deleted with the next major release 3.0.0 to unify the interface of the library. Deserialization will be done by stream operators or by calling one of the parse functions. That is, calls like json j(i); for an input stream i need to be replaced by json j = json::parse(i);. Compilers will produce a deprecation warning if client code uses this function.
      • Minor improvements:
      • Improved the performance of the serialization by avoiding the re-creation of a locale object.
      • Fixed two MSVC warnings. Compiling the test suite with /Wall now only warns about non-inlined functions (C4710) and the deprecation of the constructor from input-stream (C4996).
      • Some project internals:
      • The project has qualified for the Core Infrastructure Initiative Best Practices Badge. While most requirements where already satisfied, some led to more explicit documentation of quality-ensuring procedures. For instance, static analysis is now executed with every commit on the build server. Furthermore, the contribution guidelines document how to communicate security issues privately.
      • The test suite has been overworked and split into several files to allow for faster compilation and analysis. The execute the test suite, simply execute make check.
      • The continuous integration with Travis was extended with Clang versions 3.6.0 to 3.8.1 and now includes 18 different compiler/OS combinations.
      • An 11-day run of American fuzzy lop checked 962 million inputs on the parser and found no issue.

      v2.0.2

      Files

      • Release date: 2016-07-31
      • SHA-256: 8e97b7965b4594b00998d6704465412360e1a0ed927badb51ded8b82291a8f3d

      Summary

      This release combines a lot of small fixes and improvements. The release is backwards compatible.

      Changes

      • The parser has been overworked, and a lot of small issues have been fixed:
      • Improved parser performance by avoiding recursion and using move semantics for the return value.
      • Unescaped control characters \x10-\x1f are not accepted any more.
      • Fixed a bug in the parser when reading from an input stream.
      • Improved test case coverage for UTF-8 parsing: now, all valid Unicode code points are tested both escaped and unescaped.
      • The precision of output streams is now preserved by the parser.
      • Started to check the code correctness by proving termination of important loops. Furthermore, individual assertions have been replaced by a more systematic function which checks the class invariants. Note that assertions should be switched off in production by defining the preprocessor macro NDEBUG, see the documentation of assert.
      • A lot of code cleanup: removed unused headers, fixed some compiler warnings, and fixed a build error for Windows-based Clang builds.
      • Added some compile-time checks:
      • Unsupported compilers are rejected during compilation with an #error command.
      • Static assertion prohibits code with incompatible pointer types used in get_ptr().
      • Improved the documentation, and adjusted the documentation script to choose the correct version of sed.
      • Replaced a lot of "raw loops" by STL functions like std::all_of, std::for_each, or std::accumulate. This facilitates reasoning about termination of loops and sometimes allowed to simplify functions to a single return statement.
      • Implemented a value() function for JSON pointers (similar to at function).
      • The Homebrew formula (see Integration) is now tested for all Xcode builds (6.1 - 8.x) with Travis.
      • Avoided output to std::cout in the test cases.

      v2.0.1

      Files

      • Release date: 2016-06-28
      • SHA-256: ef550fcd7df572555bf068e9ec4e9d3b9e4cdd441cecb0dcea9ea7fd313f72dd

      Summary

      This release fixes a performance regression in the JSON serialization (function dump()). This fix is backwards compatible.

      Changes

      • The locale of the output stream (or the internal string stream if a JSON value is serialized to a string) is now adjusted once for the whole serialization instead of for each floating-point number.
      • The locale of an output stream is now correctly reset to the previous value by the JSON library.

      v2.0.0

      Files

      • Release date: 2016-06-24
      • SHA-256: ac9e1fb25c2ac9ca5fc501fcd2fe3281fe04f07018a1b48820e7b1b11491bb6c

      Summary

      This release adds several features such as JSON Pointers, JSON Patch, or support for 64 bit unsigned integers. Furthermore, several (subtle) bugs have been fixed.

      As noexcept and constexpr specifier have been added to several functions, the public API has effectively been changed in a (potential) non-backwards compatible manner. As we adhere to Semantic Versioning, this calls for a new major version, so say hello to 2️⃣.0️⃣.0️⃣.

      Changes

      • 🔟 A JSON value now uses uint64_t (default value for template parameter NumberUnsignedType) as data type for unsigned integer values. This type is used automatically when an unsigned number is parsed. Furthermore, constructors, conversion operators and an is_number_unsigned() test have been added.
      • 👉 JSON Pointer (RFC 6901) support: A JSON Pointer is a string (similar to an XPath expression) to address a value inside a structured JSON value. JSON Pointers can be used in at() and operator[] functions. Furthermore, JSON values can be “flattened” to key/value pairs using flatten() where each key is a JSON Pointer. The original value can be restored by “unflattening” the flattened value using unflatten().
      • 🏥 JSON Patch (RFC 6902) support. A JSON Patch is a JSON value that describes the required edit operations (add, change, remove, …) to transform a JSON value into another one. A JSON Patch can be created with function diff(const basic_json&) and applied with patch(const basic_json&). Note the created patches use a rather primitive algorithm so far and leave room for improvement.
      • 🇪🇺 The code is now locale-independent: Floating-point numbers are always serialized with a period (.) as decimal separator and ignores different settings from the locale.
      • 🍺 Homebrew support: Install the library with brew tap nlohmann/json && brew install nlohmann_json.
      • Added constructor to create a JSON value by parsing a std::istream (e.g., std::stringstream or std::ifstream).
      • Added noexcept specifier to basic_json(boolean_t), basic_json(const number_integer_t), basic_json(const int), basic_json(const number_float_t), iterator functions (begin(), end(), etc.)
      • When parsing numbers, the sign of 0.0 (vs. -0.0) is preserved.
      • Improved MSVC 2015, Android, and MinGW support. See README for more information.
      • Improved test coverage (added 2,225,386 tests).
      • Removed some misuses of std::move.
      • Fixed several compiler warnings.
      • Improved error messages from JSON parser.
      • Updated to re2c to version 0.16 to use a minimal DFAs for the lexer.
      • Updated test suite to use Catch version 1.5.6.
      • Made type getters (is_number, etc.) and const value access constexpr.
      • Functions push_back and operator+= now work with key/value pairs passed as initializer list, e.g. j_object += {"key", 1}.
      • Overworked CMakeLists.txt to make it easier to integrate the library into other projects.

      Notes

      • Parser error messages are still very vague and contain no information on the error location.
      • The implemented diff function is rather primitive and does not create minimal diffs.
      • The name of function iteration_wrapper may change in the future and the function will be deprecated in the next release.
      • Roundtripping (i.e., parsing a JSON value from a string, serializing it, and comparing the strings) of floating-point numbers is not 100% accurate. Note that RFC 8259 defines no format to internally represent numbers and states not requirement for roundtripping. Nevertheless, benchmarks like Native JSON Benchmark treat roundtripping deviations as conformance errors.

      v1.1.0

      Files

      • Release date: 2016-01-24
      • SHA-256: c0cf0e3017798ca6bb18e757ebc570d21a3bdac877845e2b9e9573d183ed2f05

      Summary

      This release fixes several small bugs and adds functionality in a backwards-compatible manner. Compared to the last version (1.0.0), the following changes have been made:

      Changes

      • Fixed: Floating-point numbers are now serialized and deserialized properly such that rountripping works in more cases. [#185, #186, #190, #191, #194]
      • Added: The code now contains assertions to detect undefined behavior during development. As the standard function assert is used, the assertions can be switched off by defining the preprocessor symbol NDEBUG during compilation. [#168]
      • Added: It is now possible to get a reference to the stored values via the newly added function get_ref(). [#128, #184]
      • Fixed: Access to object values via keys (operator[]) now works with all kind of string representations. [#171, #189]
      • Fixed: The code now compiles again with Microsoft Visual Studio 2015. [#144, #167, #188]
      • Fixed: All required headers are now included.
      • Fixed: Typos and other small issues. [#162, #166, #175, #177, #179, #180]

      Notes

      There are still known open issues (#178, #187) which will be fixed in version 2.0.0. However, these fixes will require a small API change and will not be entirely backwards-compatible.

      v1.0.0

      Files

      • Release date: 2015-12-28
      • SHA-256: 767dc2fab1819d7b9e19b6e456d61e38d21ef7182606ecf01516e3f5230446de

      Summary

      This is the first official release. Compared to the prerelease version 1.0.0-rc1, only a few minor improvements have been made:

      Changes

      • Changed: A UTF-8 byte order mark is silently ignored.
      • Changed: sprintf is no longer used.
      • Changed: iterator_wrapper also works for const objects; note: the name may change!
      • Changed: Error messages during deserialization have been improved.
      • Added: The parse function now also works with type std::istream&&.
      • Added: Function value(key, default_value) returns either a copy of an object's element at the specified key or a given default value if no element with the key exists.
      • Added: Public functions are tagged with the version they were introduced. This shall allow for better versioning in the future.
      • Added: All public functions and types are documented (see http://nlohmann.github.io/json/doxygen/) including executable examples.
      • Added: Allocation of all types (in particular arrays, strings, and objects) is now exception-safe.
      • Added: They descriptions of thrown exceptions have been overworked and are part of the tests suite and documentation.
    Copyright © 2013-2025 Niels Lohmann
    \ No newline at end of file diff --git a/home/sponsors/index.html b/home/sponsors/index.html index 1108f0a58..4ce1f13ea 100644 --- a/home/sponsors/index.html +++ b/home/sponsors/index.html @@ -1 +1 @@ - Sponsors - JSON for Modern C++
    Copyright © 2013-2025 Niels Lohmann
    \ No newline at end of file + Sponsors - JSON for Modern C++
    Copyright © 2013-2025 Niels Lohmann
    \ No newline at end of file diff --git a/index.html b/index.html index f724416a4..4611a1816 100644 --- a/index.html +++ b/index.html @@ -1 +1 @@ - JSON for Modern C++ - JSON for Modern C++

    JSON for Modern C++

    Copyright © 2013-2025 Niels Lohmann
    \ No newline at end of file + JSON for Modern C++ - JSON for Modern C++

    JSON for Modern C++

    Copyright © 2013-2025 Niels Lohmann
    \ No newline at end of file diff --git a/integration/cmake/index.html b/integration/cmake/index.html index fd1d80961..d35c3e26d 100644 --- a/integration/cmake/index.html +++ b/integration/cmake/index.html @@ -1,4 +1,4 @@ - CMake - JSON for Modern C++

    CMake

    Integration

    You can use the nlohmann_json::nlohmann_json interface target in CMake. This target populates the appropriate usage requirements for INTERFACE_INCLUDE_DIRECTORIES to point to the appropriate include directories and INTERFACE_COMPILE_FEATURES for the necessary C++11 flags.

    External

    To use this library from a CMake project, you can locate it directly with find_package() and use the namespaced imported target from the generated package configuration:

    Example

    CMakeLists.txt
    cmake_minimum_required(VERSION 3.5)
+ CMake - JSON for Modern C++      
     
     
      
     
      
     
     
     
     
      
     
     
     
     
     
      
     
     
     
     
           
    CMake
     
    Integration
     
    You can use the nlohmann_json::nlohmann_json interface target in CMake. This target populates the appropriate usage requirements for INTERFACE_INCLUDE_DIRECTORIES to point to the appropriate include directories and INTERFACE_COMPILE_FEATURES for the necessary C++11 flags.
     
    External
     
    To use this library from a CMake project, you can locate it directly with find_package() and use the namespaced imported target from the generated package configuration:
     
     
    Example
     
    CMakeLists.txt
    cmake_minimum_required(VERSION 3.5)
 project(ExampleProject LANGUAGES CXX)
 
 find_package(nlohmann_json 3.12.0 REQUIRED)
@@ -46,4 +46,4 @@
     GIT_REPOSITORY https://github.com/nlohmann/json
     GIT_TAG v3.12.0
 )
-
     
    However, the repository https://github.com/nlohmann/json download size is quite large.
     
     
    CMake Options
     
    JSON_BuildTests
     
    Build the unit tests when BUILD_TESTING is enabled. This option is ON by default if the library's CMake project is the top project. That is, when integrating the library as described above, the test suite is not built unless explicitly switched on with this option.
     
    JSON_CI
     
    Enable CI build targets. The exact targets are used during the several CI steps and are subject to change without notice. This option is OFF by default.
     
    JSON_Diagnostics
     
    Enable extended diagnostic messages by defining macro JSON_DIAGNOSTICS. This option is OFF by default.
     
    JSON_Diagnostic_Positions
     
    Enable position diagnostics by defining macro JSON_DIAGNOSTIC_POSITIONS. This option is OFF by default.
     
    JSON_DisableEnumSerialization
     
    Disable default enum serialization by defining the macro JSON_DISABLE_ENUM_SERIALIZATION. This option is OFF by default.
     
    JSON_FastTests
     
    Skip expensive/slow test suites. This option is OFF by default. Depends on JSON_BuildTests.
     
    JSON_GlobalUDLs
     
    Place user-defined string literals in the global namespace by defining the macro JSON_USE_GLOBAL_UDLS. This option is OFF by default.
     
    JSON_ImplicitConversions
     
    Enable implicit conversions by defining macro JSON_USE_IMPLICIT_CONVERSIONS. This option is ON by default.
     
    JSON_Install
     
    Install CMake targets during install step. This option is ON by default if the library's CMake project is the top project.
     
    JSON_LegacyDiscardedValueComparison
     
    Enable the (incorrect) legacy comparison behavior of discarded JSON values by defining macro JSON_USE_LEGACY_DISCARDED_VALUE_COMPARISON. This option is OFF by default.
     
    JSON_MultipleHeaders
     
    Use the non-amalgamated version of the library. This option is OFF by default.
     
    JSON_SystemInclude
     
    Treat the library headers like system headers (i.e., adding SYSTEM to the target_include_directories call) to check for this library by tools like Clang-Tidy. This option is OFF by default.
     
    JSON_Valgrind
     
    Execute the test suite with Valgrind. This option is OFF by default. Depends on JSON_BuildTests.
       
     
       
      
     
     
     
     
     
     Copyright © 2013-2025 Niels Lohmann 
     
     
                 
     
     
     
     
     
     
     
         
\ No newline at end of file
+

    However, the repository https://github.com/nlohmann/json download size is quite large.

    CMake Options

    JSON_BuildTests

    Build the unit tests when BUILD_TESTING is enabled. This option is ON by default if the library's CMake project is the top project. That is, when integrating the library as described above, the test suite is not built unless explicitly switched on with this option.

    JSON_CI

    Enable CI build targets. The exact targets are used during the several CI steps and are subject to change without notice. This option is OFF by default.

    JSON_Diagnostics

    Enable extended diagnostic messages by defining macro JSON_DIAGNOSTICS. This option is OFF by default.

    JSON_Diagnostic_Positions

    Enable position diagnostics by defining macro JSON_DIAGNOSTIC_POSITIONS. This option is OFF by default.

    JSON_DisableEnumSerialization

    Disable default enum serialization by defining the macro JSON_DISABLE_ENUM_SERIALIZATION. This option is OFF by default.

    JSON_FastTests

    Skip expensive/slow test suites. This option is OFF by default. Depends on JSON_BuildTests.

    JSON_GlobalUDLs

    Place user-defined string literals in the global namespace by defining the macro JSON_USE_GLOBAL_UDLS. This option is OFF by default.

    JSON_ImplicitConversions

    Enable implicit conversions by defining macro JSON_USE_IMPLICIT_CONVERSIONS. This option is ON by default.

    JSON_Install

    Install CMake targets during install step. This option is ON by default if the library's CMake project is the top project.

    JSON_LegacyDiscardedValueComparison

    Enable the (incorrect) legacy comparison behavior of discarded JSON values by defining macro JSON_USE_LEGACY_DISCARDED_VALUE_COMPARISON. This option is OFF by default.

    JSON_MultipleHeaders

    Use the non-amalgamated version of the library. This option is OFF by default.

    JSON_SystemInclude

    Treat the library headers like system headers (i.e., adding SYSTEM to the target_include_directories call) to check for this library by tools like Clang-Tidy. This option is OFF by default.

    JSON_Valgrind

    Execute the test suite with Valgrind. This option is OFF by default. Depends on JSON_BuildTests.

    Copyright © 2013-2025 Niels Lohmann
    \ No newline at end of file diff --git a/integration/index.html b/integration/index.html index 8a50d9207..989c82d7e 100644 --- a/integration/index.html +++ b/integration/index.html @@ -1,5 +1,5 @@ - Header only - JSON for Modern C++

    Header only

    json.hpp is the single required file in single_include/nlohmann or released here. You need to add

    #include <nlohmann/json.hpp>
+ Header only - JSON for Modern C++      
     
     
      
     
      
     
     
     
     
      
     
     
     
     
     
      
     
     
     
     
           
    Header only
     
    json.hpp is the single required file in single_include/nlohmann or released here. You need to add
     
    #include <nlohmann/json.hpp>
 
 // for convenience
 using json = nlohmann::json;
-
     
    to the files you want to process JSON and set the necessary switches to enable C++11 (e.g., -std=c++11 for GCC and Clang).
     
    You can further use file single_include/nlohmann/json_fwd.hpp for forward declarations.
       
     
       
      
     
     
     
     
     
     Copyright © 2013-2025 Niels Lohmann 
     
     
                 
     
     
     
     
     
     
     
         
\ No newline at end of file
+

    to the files you want to process JSON and set the necessary switches to enable C++11 (e.g., -std=c++11 for GCC and Clang).

    You can further use file single_include/nlohmann/json_fwd.hpp for forward declarations.

    Copyright © 2013-2025 Niels Lohmann
    \ No newline at end of file diff --git a/integration/migration_guide/index.html b/integration/migration_guide/index.html index 387799749..aeed33905 100644 --- a/integration/migration_guide/index.html +++ b/integration/migration_guide/index.html @@ -1,4 +1,4 @@ - Migration Guide - JSON for Modern C++

    Migration Guide

    This page collects some guidelines on how to future-proof your code for future versions of this library.

    Replace deprecated functions

    The following functions have been deprecated and will be removed in the next major version (i.e., 4.0.0). All deprecations are annotated with HEDLEY_DEPRECATED_FOR to report which function to use instead.

    Parsing

    Copyright © 2013-2025 Niels Lohmann
    \ No newline at end of file diff --git a/integration/package_managers/index.html b/integration/package_managers/index.html index 390015186..40d3fab62 100644 --- a/integration/package_managers/index.html +++ b/integration/package_managers/index.html @@ -1,4 +1,4 @@ - Package Managers - JSON for Modern C++

    Package Managers

    ![Homebrew](../images/package_managers/homebrew.svg){: style="height:1em"} [**Homebrew**](#homebrew) `nlohmann-json`   ![Meson](../images/package_managers/meson.svg){: style="height:1em"} [**Meson**](#meson) `nlohmann_json`   ![Bazel](../images/package_managers/bazel.svg){: style="height:1em"} [**Bazel**](#bazel) `nlohmann_json`
    ![Conan](../images/package_managers/conan.svg){: style="height:1em"} [**Conan**](#conan) `nlohmann_json`   ![Spack](../images/package_managers/spack.svg){: style="height:1em"} [**Spack**](#spack) `nlohmann-json`   [**Hunter**](#hunter) `nlohmann_json`
    ![vcpkg](../images/package_managers/vcpkg.png){: style="height:1em"} [**vcpkg**](#vcpkg) `nlohmann-json`   [**cget**](#cget) `nlohmann/json`   ![Swift Package Manager](../images/package_managers/swift.svg){: style="height:1em"} [**Swift Package Manager**](#swift-package-manager) `nlohmann/json`
    ![Nuget](../images/package_managers/nuget.svg){: style="height:1em"} [**NuGet**](#nuget) `nlohmann.json`   ![Conda](../images/package_managers/conda.svg){: style="height:1em"} [**Conda**](#conda) `nlohmann_json`   ![MacPorts](../images/package_managers/macports.svg){: style="height:1em"} [**MacPorts**](#macports) `nlohmann-json`
    ![cpm.cmake](../images/package_managers/CPM.png){: style="height:1em"} [**CPM.cmake**](#cpmcmake) `gh:nlohmann/json` ![xmake](../images/package_managers/xmake.svg){: style="height:1em"} [**xmake**](#xmake) `nlohmann_json`

    Running example

    Throughout this page, we will describe how to compile the example file example.cpp below.

    #include <nlohmann/json.hpp>
+ Package Managers - JSON for Modern C++      
     
     
      
     
      
     
     
     
     
      
     
     
     
     
     
      
     
     
     
     
           
    Package Managers
     
     ![Homebrew](../images/package_managers/homebrew.svg){: style="height:1em"} [**Homebrew**](#homebrew) `nlohmann-json`   ![Meson](../images/package_managers/meson.svg){: style="height:1em"} [**Meson**](#meson) `nlohmann_json`   ![Bazel](../images/package_managers/bazel.svg){: style="height:1em"} [**Bazel**](#bazel) `nlohmann_json`
     ![Conan](../images/package_managers/conan.svg){: style="height:1em"} [**Conan**](#conan) `nlohmann_json`   ![Spack](../images/package_managers/spack.svg){: style="height:1em"} [**Spack**](#spack) `nlohmann-json`   [**Hunter**](#hunter) `nlohmann_json`
     ![vcpkg](../images/package_managers/vcpkg.png){: style="height:1em"} [**vcpkg**](#vcpkg) `nlohmann-json`   [**cget**](#cget) `nlohmann/json`   ![Swift Package Manager](../images/package_managers/swift.svg){: style="height:1em"} [**Swift Package Manager**](#swift-package-manager) `nlohmann/json`
     ![Nuget](../images/package_managers/nuget.svg){: style="height:1em"} [**NuGet**](#nuget) `nlohmann.json`   ![Conda](../images/package_managers/conda.svg){: style="height:1em"} [**Conda**](#conda) `nlohmann_json`   ![MacPorts](../images/package_managers/macports.svg){: style="height:1em"} [**MacPorts**](#macports) `nlohmann-json`
     ![cpm.cmake](../images/package_managers/CPM.png){: style="height:1em"} [**CPM.cmake**](#cpmcmake) `gh:nlohmann/json` ![xmake](../images/package_managers/xmake.svg){: style="height:1em"} [**xmake**](#xmake) `nlohmann_json` 
     
    Running example
     
    Throughout this page, we will describe how to compile the example file example.cpp below.
     
    #include <nlohmann/json.hpp>
 #include <iostream>
 #include <iomanip>
 
@@ -330,4 +330,4 @@ cmake --build build
     set_languages("cxx11")
 
      
  •  
    Build
     
    xmake
 
     
    •  
  •  
    Run
     
    xmake run
-
     
    •    
     
    Other package managers
     
    The library is also contained in many other package repositories: Packaging status
     
     Package version overview 
    Packaging status
     
     
     
    Buckaroo
     
    If you are using Buckaroo, you can install this library's module with buckaroo add github.com/buckaroo-pm/nlohmann-json. There is a demo repo here.
     
     
    Warning
     
    The module is outdated as the respective repository has not been updated in years.
     
     
    CocoaPods
     
    If you are using CocoaPods, you can use the library by adding pod "nlohmann_json", '~>3.1.2' to your podfile (see an example). Please file issues here.
     
     
     
    Warning
     
    The module is outdated as the respective pod has not been updated in years.
     
       
     
       
      
     
     
     
     
     
     Copyright © 2013-2025 Niels Lohmann 
     
     
                 
     
     
     
     
     
     
     
         
\ No newline at end of file
+

    Other package managers

    The library is also contained in many other package repositories: Packaging status

    Package version overview

    Packaging status

    Buckaroo

    If you are using Buckaroo, you can install this library's module with buckaroo add github.com/buckaroo-pm/nlohmann-json. There is a demo repo here.

    Warning

    The module is outdated as the respective repository has not been updated in years.

    CocoaPods

    If you are using CocoaPods, you can use the library by adding pod "nlohmann_json", '~>3.1.2' to your podfile (see an example). Please file issues here.

    Warning

    The module is outdated as the respective pod has not been updated in years.

    Copyright © 2013-2025 Niels Lohmann
    \ No newline at end of file diff --git a/integration/pkg-config/index.html b/integration/pkg-config/index.html index e4304e8d5..81ded77c1 100644 --- a/integration/pkg-config/index.html +++ b/integration/pkg-config/index.html @@ -1,3 +1,3 @@ - Pkg-config - JSON for Modern C++

    Pkg-config

    If you are using bare Makefiles, you can use pkg-config to generate the include flags that point to where the library is installed:

    pkg-config nlohmann_json --cflags
+ Pkg-config - JSON for Modern C++      
     
     
      
     
      
     
     
     
     
      
     
     
     
     
     
      
     
     
     
     
           
    Pkg-config
     
    If you are using bare Makefiles, you can use pkg-config to generate the include flags that point to where the library is installed:
     
    pkg-config nlohmann_json --cflags
 
     
    Users of the Meson build system will also be able to use a system-wide library, which will be found by pkg-config:
     
    json = dependency('nlohmann_json', required: true)
-
       
     
       
      
     
     
     
     
     
     Copyright © 2013-2025 Niels Lohmann 
     
     
                 
     
     
     
     
     
     
     
         
\ No newline at end of file
+
    Copyright © 2013-2025 Niels Lohmann
    \ No newline at end of file diff --git a/search/search_index.json b/search/search_index.json index c6b68dfdc..0e283e932 100644 --- a/search/search_index.json +++ b/search/search_index.json @@ -1 +1 @@ -{"config":{"lang":["en"],"separator":"[\\s\\-\\.]","pipeline":["stopWordFilter"]},"docs":[{"location":"","title":"JSON for Modern C++","text":""},{"location":"api/json/","title":"nlohmann::json","text":"
    using json = basic_json<>;\n

    This type is the default specialization of the basic_json class which uses the standard template types.

    "},{"location":"api/json/#examples","title":"Examples","text":"Example

    The example below demonstrates how to use the type nlohmann::json.

    #include <iostream>\n#include <iomanip>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // create a JSON object\n    json j =\n    {\n        {\"pi\", 3.141},\n        {\"happy\", true},\n        {\"name\", \"Niels\"},\n        {\"nothing\", nullptr},\n        {\n            \"answer\", {\n                {\"everything\", 42}\n            }\n        },\n        {\"list\", {1, 0, 2}},\n        {\n            \"object\", {\n                {\"currency\", \"USD\"},\n                {\"value\", 42.99}\n            }\n        }\n    };\n\n    // add new values\n    j[\"new\"][\"key\"][\"value\"] = {\"another\", \"list\"};\n\n    // count elements\n    auto s = j.size();\n    j[\"size\"] = s;\n\n    // pretty print with indent of 4 spaces\n    std::cout << std::setw(4) << j << '\\n';\n}\n

    Output:

    {\n    \"answer\": {\n        \"everything\": 42\n    },\n    \"happy\": true,\n    \"list\": [\n        1,\n        0,\n        2\n    ],\n    \"name\": \"Niels\",\n    \"new\": {\n        \"key\": {\n            \"value\": [\n                \"another\",\n                \"list\"\n            ]\n        }\n    },\n    \"nothing\": null,\n    \"object\": {\n        \"currency\": \"USD\",\n        \"value\": 42.99\n    },\n    \"pi\": 3.141,\n    \"size\": 8\n}\n
    "},{"location":"api/json/#version-history","title":"Version history","text":"

    Since version 1.0.0.

    "},{"location":"api/operator_gtgt/","title":"nlohmann::operator>>(basic_json)","text":"
    std::istream& operator>>(std::istream& i, basic_json& j);\n

    Deserializes an input stream to a JSON value.

    "},{"location":"api/operator_gtgt/#parameters","title":"Parameters","text":"i (in, out) input stream to read a serialized JSON value from j (in, out) JSON value to write the deserialized input to"},{"location":"api/operator_gtgt/#return-value","title":"Return value","text":"

    the stream i

    "},{"location":"api/operator_gtgt/#exceptions","title":"Exceptions","text":"
    • Throws parse_error.101 in case of an unexpected token.
    • Throws parse_error.102 if to_unicode fails or surrogate error.
    • Throws parse_error.103 if to_unicode fails.
    "},{"location":"api/operator_gtgt/#complexity","title":"Complexity","text":"

    Linear in the length of the input. The parser is a predictive LL(1) parser.

    "},{"location":"api/operator_gtgt/#notes","title":"Notes","text":"

    A UTF-8 byte order mark is silently ignored.

    Deprecation

    This function replaces function std::istream& operator<<(basic_json& j, std::istream& i) which has been deprecated in version 3.0.0. It will be removed in version 4.0.0. Please replace calls like j << i; with i >> j;.

    "},{"location":"api/operator_gtgt/#examples","title":"Examples","text":"Example

    The example below shows how a JSON value is constructed by reading a serialization from a stream.

    #include <iostream>\n#include <iomanip>\n#include <sstream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // create stream with serialized JSON\n    std::stringstream ss;\n    ss << R\"({\n        \"number\": 23,\n        \"string\": \"Hello, world!\",\n        \"array\": [1, 2, 3, 4, 5],\n        \"boolean\": false,\n        \"null\": null\n    })\";\n\n    // create JSON value and read the serialization from the stream\n    json j;\n    ss >> j;\n\n    // serialize JSON\n    std::cout << std::setw(2) << j << '\\n';\n}\n

    Output:

    {\n  \"array\": [\n    1,\n    2,\n    3,\n    4,\n    5\n  ],\n  \"boolean\": false,\n  \"null\": null,\n  \"number\": 23,\n  \"string\": \"Hello, world!\"\n}\n
    "},{"location":"api/operator_gtgt/#see-also","title":"See also","text":"
    • accept - check if the input is valid JSON
    • parse - deserialize from a compatible input
    "},{"location":"api/operator_gtgt/#version-history","title":"Version history","text":"
    • Added in version 1.0.0. Deprecated in version 3.0.0.
    "},{"location":"api/operator_literal_json/","title":"nlohmann::operator\"\"_json","text":"
    json operator \"\"_json(const char* s, std::size_t n);\n

    This operator implements a user-defined string literal for JSON objects. It can be used by adding _json to a string literal and returns a json object if no parse error occurred.

    It is recommended to bring the operator into scope using any of the following lines: 

    using nlohmann::literals::operator \"\"_json;\nusing namespace nlohmann::literals;\nusing namespace nlohmann::json_literals;\nusing namespace nlohmann::literals::json_literals;\nusing namespace nlohmann;\n

    This is suggested to ease migration to the next major version release of the library. See JSON_USE_GLOBAL_UDLS for details.

    "},{"location":"api/operator_literal_json/#parameters","title":"Parameters","text":"s (in) a string representation of a JSON object n (in) length of string s"},{"location":"api/operator_literal_json/#return-value","title":"Return value","text":"

    json value parsed from s

    "},{"location":"api/operator_literal_json/#exceptions","title":"Exceptions","text":"

    The function can throw anything that parse(s, s+n) would throw.

    "},{"location":"api/operator_literal_json/#complexity","title":"Complexity","text":"

    Linear.

    "},{"location":"api/operator_literal_json/#examples","title":"Examples","text":"Example

    The following code shows how to create JSON values from string literals.

    #include <iostream>\n#include <iomanip>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\nusing namespace nlohmann::literals;\n\nint main()\n{\n    json j = R\"( {\"hello\": \"world\", \"answer\": 42} )\"_json;\n\n    std::cout << std::setw(2) << j << '\\n';\n}\n

    Output:

    {\n  \"answer\": 42,\n  \"hello\": \"world\"\n}\n
    "},{"location":"api/operator_literal_json/#version-history","title":"Version history","text":"
    • Added in version 1.0.0.
    • Moved to namespace nlohmann::literals::json_literals in 3.11.0.
    "},{"location":"api/operator_literal_json_pointer/","title":"nlohmann::operator\"\"_json_pointer","text":"
    json_pointer operator \"\"_json_pointer(const char* s, std::size_t n);\n

    This operator implements a user-defined string literal for JSON Pointers. It can be used by adding _json_pointer to a string literal and returns a json_pointer object if no parse error occurred.

    It is recommended to bring the operator into scope using any of the following lines: 

    using nlohmann::literals::operator \"\"_json_pointer;\nusing namespace nlohmann::literals;\nusing namespace nlohmann::json_literals;\nusing namespace nlohmann::literals::json_literals;\nusing namespace nlohmann;\n
    This is suggested to ease migration to the next major version release of the library. See JSON_USE_GLOBAL_UDLS for details.

    "},{"location":"api/operator_literal_json_pointer/#parameters","title":"Parameters","text":"s (in) a string representation of a JSON Pointer n (in) length of string s"},{"location":"api/operator_literal_json_pointer/#return-value","title":"Return value","text":"

    json_pointer value parsed from s

    "},{"location":"api/operator_literal_json_pointer/#exceptions","title":"Exceptions","text":"

    The function can throw anything that json_pointer::json_pointer would throw.

    "},{"location":"api/operator_literal_json_pointer/#complexity","title":"Complexity","text":"

    Linear.

    "},{"location":"api/operator_literal_json_pointer/#examples","title":"Examples","text":"Example

    The following code shows how to create JSON Pointers from string literals.

    #include <iostream>\n#include <iomanip>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\nusing namespace nlohmann::literals;\n\nint main()\n{\n    json j = R\"( {\"hello\": \"world\", \"answer\": 42} )\"_json;\n    auto val = j[\"/hello\"_json_pointer];\n\n    std::cout << std::setw(2) << val << '\\n';\n}\n

    Output:

    \"world\"\n
    "},{"location":"api/operator_literal_json_pointer/#see-also","title":"See also","text":"
    • json_pointer - type to represent JSON Pointers
    "},{"location":"api/operator_literal_json_pointer/#version-history","title":"Version history","text":"
    • Added in version 2.0.0.
    • Moved to namespace nlohmann::literals::json_literals in 3.11.0.
    "},{"location":"api/operator_ltlt/","title":"nlohmann::operator<<(basic_json), nlohmann::operator<<(json_pointer)","text":"
    std::ostream& operator<<(std::ostream& o, const basic_json& j);      // (1)\n\nstd::ostream& operator<<(std::ostream& o, const json_pointer& ptr);  // (2)\n
    1. Serialize the given JSON value j to the output stream o. The JSON value will be serialized using the dump member function.
      • The indentation of the output can be controlled with the member variable width of the output stream o. For instance, using the manipulator std::setw(4) on o sets the indentation level to 4 and the serialization result is the same as calling dump(4).
      • The indentation character can be controlled with the member variable fill of the output stream o. For instance, the manipulator std::setfill('\\\\t') sets indentation to use a tab character rather than the default space character.
    2. Write a string representation of the given JSON pointer ptr to the output stream o. The string representation is obtained using the to_string member function.
    "},{"location":"api/operator_ltlt/#parameters","title":"Parameters","text":"o (in, out) stream to write to j (in) JSON value to serialize ptr (in) JSON pointer to write"},{"location":"api/operator_ltlt/#return-value","title":"Return value","text":"

    the stream o

    "},{"location":"api/operator_ltlt/#exceptions","title":"Exceptions","text":"
    1. Throws type_error.316 if a string stored inside the JSON value is not UTF-8 encoded. Note that unlike the dump member functions, no error_handler can be set.
    2. None.
    "},{"location":"api/operator_ltlt/#complexity","title":"Complexity","text":"

    Linear.

    "},{"location":"api/operator_ltlt/#notes","title":"Notes","text":"

    Deprecation

    Function std::ostream& operator<<(std::ostream& o, const basic_json& j) replaces function std::ostream& operator>>(const basic_json& j, std::ostream& o) which has been deprecated in version 3.0.0. It will be removed in version 4.0.0. Please replace calls like j >> o; with o << j;.

    "},{"location":"api/operator_ltlt/#examples","title":"Examples","text":"Example: (1) serialize JSON value to stream

    The example below shows the serialization with different parameters to width to adjust the indentation level.

    #include <iostream>\n#include <iomanip>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // create JSON values\n    json j_object = {{\"one\", 1}, {\"two\", 2}};\n    json j_array = {1, 2, 4, 8, 16};\n\n    // serialize without indentation\n    std::cout << j_object << \"\\n\\n\";\n    std::cout << j_array << \"\\n\\n\";\n\n    // serialize with indentation\n    std::cout << std::setw(4) << j_object << \"\\n\\n\";\n    std::cout << std::setw(2) << j_array << \"\\n\\n\";\n    std::cout << std::setw(1) << std::setfill('\\t') << j_object << \"\\n\\n\";\n}\n

    Output:

    {\"one\":1,\"two\":2}\n\n[1,2,4,8,16]\n\n{\n    \"one\": 1,\n    \"two\": 2\n}\n\n[\n  1,\n  2,\n  4,\n  8,\n  16\n]\n\n{\n    \"one\": 1,\n    \"two\": 2\n}\n
    Example: (2) write JSON pointer to stream

    The example below shows how to write a JSON pointer to a stream.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // create JSON poiner\n    json::json_pointer ptr(\"/foo/bar/baz\");\n\n    // write string representation to stream\n    std::cout << ptr << std::endl;\n}\n

    Output:

    /foo/bar/baz\n
    "},{"location":"api/operator_ltlt/#version-history","title":"Version history","text":"
    1. Added in version 1.0.0. Added support for indentation character and deprecated std::ostream& operator>>(const basic_json& j, std::ostream& o) in version 3.0.0.
    2. Added in version 3.11.0.
    "},{"location":"api/ordered_json/","title":"nlohmann::ordered_json","text":"
    using ordered_json = basic_json<ordered_map>;\n

    This type preserves the insertion order of object keys.

    "},{"location":"api/ordered_json/#iterator-invalidation","title":"Iterator invalidation","text":"

    The type is based on ordered_map which in turn uses a std::vector to store object elements. Therefore, adding object elements can yield a reallocation in which case all iterators (including the end() iterator) and all references to the elements are invalidated. Also, any iterator or reference after the insertion point will point to the same index, which is now a different value.

    "},{"location":"api/ordered_json/#examples","title":"Examples","text":"Example

    The example below demonstrates how ordered_json preserves the insertion order of object keys.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing ordered_json = nlohmann::ordered_json;\n\nint main()\n{\n    ordered_json j;\n    j[\"one\"] = 1;\n    j[\"two\"] = 2;\n    j[\"three\"] = 3;\n\n    std::cout << j.dump(2) << '\\n';\n}\n

    Output:

    {\n  \"one\": 1,\n  \"two\": 2,\n  \"three\": 3\n}\n
    "},{"location":"api/ordered_json/#see-also","title":"See also","text":"
    • ordered_map
    • Object Order
    "},{"location":"api/ordered_json/#version-history","title":"Version history","text":"

    Since version 3.9.0.

    "},{"location":"api/ordered_map/","title":"nlohmann::ordered_map","text":"
    template<class Key, class T, class IgnoredLess = std::less<Key>,\n         class Allocator = std::allocator<std::pair<const Key, T>>>\nstruct ordered_map : std::vector<std::pair<const Key, T>, Allocator>;\n

    A minimal map-like container that preserves insertion order for use within nlohmann::ordered_json (nlohmann::basic_json<ordered_map>).

    "},{"location":"api/ordered_map/#template-parameters","title":"Template parameters","text":"Key key type T mapped type IgnoredLess comparison function (ignored and only added to ensure compatibility with std::map) Allocator allocator type"},{"location":"api/ordered_map/#iterator-invalidation","title":"Iterator invalidation","text":"

    The type uses a std::vector to store object elements. Therefore, adding elements can yield a reallocation in which case all iterators (including the end() iterator) and all references to the elements are invalidated.

    "},{"location":"api/ordered_map/#member-types","title":"Member types","text":"
    • key_type - key type (Key)
    • mapped_type - mapped type (T)
    • Container - base container type (std::vector<std::pair<const Key, T>, Allocator>)
    • iterator
    • const_iterator
    • size_type
    • value_type
    • key_compare - key comparison function 
      std::equal_to<Key>  // until C++14\n\nstd::equal_to<>     // since C++14\n
    "},{"location":"api/ordered_map/#member-functions","title":"Member functions","text":"
    • (constructor)
    • (destructor)
    • emplace
    • operator[]
    • at
    • erase
    • count
    • find
    • insert
    "},{"location":"api/ordered_map/#examples","title":"Examples","text":"Example

    The example shows the different behavior of std::map and nlohmann::ordered_map.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\n// simple output function\ntemplate<typename Map>\nvoid output(const char* prefix, const Map& m)\n{\n    std::cout << prefix << \" = { \";\n    for (auto& element : m)\n    {\n        std::cout << element.first << \":\" << element.second << ' ';\n    }\n    std::cout << \"}\" << std::endl;\n}\n\nint main()\n{\n    // create and fill two maps\n    nlohmann::ordered_map<std::string, std::string> m_ordered;\n    m_ordered[\"one\"] = \"eins\";\n    m_ordered[\"two\"] = \"zwei\";\n    m_ordered[\"three\"] = \"drei\";\n\n    std::map<std::string, std::string> m_std;\n    m_std[\"one\"] = \"eins\";\n    m_std[\"two\"] = \"zwei\";\n    m_std[\"three\"] = \"drei\";\n\n    // output: m_ordered is ordered by insertion order, m_std is ordered by key\n    output(\"m_ordered\", m_ordered);\n    output(\"m_std\", m_std);\n\n    // erase and re-add \"one\" key\n    m_ordered.erase(\"one\");\n    m_ordered[\"one\"] = \"eins\";\n\n    m_std.erase(\"one\");\n    m_std[\"one\"] = \"eins\";\n\n    // output: m_ordered shows newly added key at the end; m_std is again ordered by key\n    output(\"m_ordered\", m_ordered);\n    output(\"m_std\", m_std);\n}\n

    Output:

    m_ordered = { one:eins two:zwei three:drei }\nm_std = { one:eins three:drei two:zwei }\nm_ordered = { two:zwei three:drei one:eins }\nm_std = { one:eins three:drei two:zwei }\n
    "},{"location":"api/ordered_map/#see-also","title":"See also","text":"
    • ordered_json
    "},{"location":"api/ordered_map/#version-history","title":"Version history","text":"
    • Added in version 3.9.0 to implement nlohmann::ordered_json.
    • Added key_compare member in version 3.11.0.
    "},{"location":"api/adl_serializer/","title":"nlohmann::adl_serializer","text":"
    template<typename, typename>\nstruct adl_serializer;\n

    Serializer that uses ADL (Argument-Dependent Lookup) to choose to_json/from_json functions from the types' namespaces.

    It is implemented similarly to

    template<typename ValueType>\nstruct adl_serializer {\n    template<typename BasicJsonType>\n    static void to_json(BasicJsonType& j, const T& value) {\n        // calls the \"to_json\" method in T's namespace\n    }\n\n    template<typename BasicJsonType>\n    static void from_json(const BasicJsonType& j, T& value) {\n        // same thing, but with the \"from_json\" method\n    }\n};\n
    "},{"location":"api/adl_serializer/#member-functions","title":"Member functions","text":"
    • from_json - convert a JSON value to any value type
    • to_json - convert any value type to a JSON value
    "},{"location":"api/adl_serializer/#version-history","title":"Version history","text":"
    • Added in version 2.1.0.
    "},{"location":"api/adl_serializer/from_json/","title":"nlohmann::adl_serializer::from_json","text":"
    // (1)\ntemplate<typename BasicJsonType, typename TargetType = ValueType>\nstatic auto from_json(BasicJsonType && j, TargetType& val) noexcept(\n    noexcept(::nlohmann::from_json(std::forward<BasicJsonType>(j), val)))\n-> decltype(::nlohmann::from_json(std::forward<BasicJsonType>(j), val), void())\n\n// (2)\ntemplate<typename BasicJsonType, typename TargetType = ValueType>\nstatic auto from_json(BasicJsonType && j) noexcept(\nnoexcept(::nlohmann::from_json(std::forward<BasicJsonType>(j), detail::identity_tag<TargetType> {})))\n-> decltype(::nlohmann::from_json(std::forward<BasicJsonType>(j), detail::identity_tag<TargetType> {}))\n

    This function is usually called by the get() function of the basic_json class (either explicitly or via the conversion operators).

    1. This function is chosen for default-constructible value types.
    2. This function is chosen for value types which are not default-constructible.
    "},{"location":"api/adl_serializer/from_json/#parameters","title":"Parameters","text":"j (in) JSON value to read from val (out) value to write to"},{"location":"api/adl_serializer/from_json/#return-value","title":"Return value","text":"

    Copy of the JSON value, converted to ValueType

    "},{"location":"api/adl_serializer/from_json/#examples","title":"Examples","text":"Example: (1) Default-constructible type

    The example below shows how a from_json function can be implemented for a user-defined type. This function is called by the adl_serializer when template get<ns::person>() is called.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nnamespace ns\n{\n// a simple struct to model a person\nstruct person\n{\n    std::string name;\n    std::string address;\n    int age;\n};\n} // namespace ns\n\nnamespace ns\n{\nvoid from_json(const json& j, person& p)\n{\n    j.at(\"name\").get_to(p.name);\n    j.at(\"address\").get_to(p.address);\n    j.at(\"age\").get_to(p.age);\n}\n} // namespace ns\n\nint main()\n{\n    json j;\n    j[\"name\"] = \"Ned Flanders\";\n    j[\"address\"] = \"744 Evergreen Terrace\";\n    j[\"age\"] = 60;\n\n    auto p = j.template get<ns::person>();\n\n    std::cout << p.name << \" (\" << p.age << \") lives in \" << p.address << std::endl;\n}\n

    Output:

    Ned Flanders (60) lives in 744 Evergreen Terrace\n
    Example: (2) Non-default-constructible type

    The example below shows how a from_json is implemented as part of a specialization of the adl_serializer to realize the conversion of a non-default-constructible type.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nnamespace ns\n{\n// a simple struct to model a person (not default constructible)\nstruct person\n{\n    person(std::string n, std::string a, int aa)\n        : name(std::move(n)), address(std::move(a)), age(aa)\n    {}\n\n    std::string name;\n    std::string address;\n    int age;\n};\n} // namespace ns\n\nnamespace nlohmann\n{\ntemplate <>\nstruct adl_serializer<ns::person>\n{\n    static ns::person from_json(const json& j)\n    {\n        return {j.at(\"name\"), j.at(\"address\"), j.at(\"age\")};\n    }\n\n    // Here's the catch! You must provide a to_json method! Otherwise, you\n    // will not be able to convert person to json, since you fully\n    // specialized adl_serializer on that type\n    static void to_json(json& j, ns::person p)\n    {\n        j[\"name\"] = p.name;\n        j[\"address\"] = p.address;\n        j[\"age\"] = p.age;\n    }\n};\n} // namespace nlohmann\n\nint main()\n{\n    json j;\n    j[\"name\"] = \"Ned Flanders\";\n    j[\"address\"] = \"744 Evergreen Terrace\";\n    j[\"age\"] = 60;\n\n    auto p = j.template get<ns::person>();\n\n    std::cout << p.name << \" (\" << p.age << \") lives in \" << p.address << std::endl;\n}\n

    Output:

    Ned Flanders (60) lives in 744 Evergreen Terrace\n
    "},{"location":"api/adl_serializer/from_json/#see-also","title":"See also","text":"
    • to_json
    "},{"location":"api/adl_serializer/from_json/#version-history","title":"Version history","text":"
    • Added in version 2.1.0.
    "},{"location":"api/adl_serializer/to_json/","title":"nlohmann::adl_serializer::to_json","text":"
    template<typename BasicJsonType, typename TargetType = ValueType>\nstatic auto to_json(BasicJsonType& j, TargetType && val) noexcept(\n    noexcept(::nlohmann::to_json(j, std::forward<TargetType>(val))))\n-> decltype(::nlohmann::to_json(j, std::forward<TargetType>(val)), void())\n

    This function is usually called by the constructors of the basic_json class.

    "},{"location":"api/adl_serializer/to_json/#parameters","title":"Parameters","text":"j (out) JSON value to write to val (in) value to read from"},{"location":"api/adl_serializer/to_json/#examples","title":"Examples","text":"Example

    The example below shows how a to_json function can be implemented for a user-defined type. This function is called by the adl_serializer when the constructor basic_json(ns::person) is called.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nnamespace ns\n{\n// a simple struct to model a person\nstruct person\n{\n    std::string name;\n    std::string address;\n    int age;\n};\n} // namespace ns\n\nnamespace ns\n{\nvoid to_json(json& j, const person& p)\n{\n    j = json{ {\"name\", p.name}, {\"address\", p.address}, {\"age\", p.age} };\n}\n} // namespace ns\n\nint main()\n{\n    ns::person p = {\"Ned Flanders\", \"744 Evergreen Terrace\", 60};\n\n    json j = p;\n\n    std::cout << j << std::endl;\n}\n

    Output:

    {\"address\":\"744 Evergreen Terrace\",\"age\":60,\"name\":\"Ned Flanders\"}\n
    "},{"location":"api/adl_serializer/to_json/#see-also","title":"See also","text":"
    • from_json
    "},{"location":"api/adl_serializer/to_json/#version-history","title":"Version history","text":"
    • Added in version 2.1.0.
    "},{"location":"api/basic_json/","title":"nlohmann::basic_json","text":"

    Defined in header <nlohmann/json.hpp>

    template<\n    template<typename U, typename V, typename... Args> class ObjectType = std::map,\n    template<typename U, typename... Args> class ArrayType = std::vector,\n    class StringType = std::string,\n    class BooleanType = bool,\n    class NumberIntegerType = std::int64_t,\n    class NumberUnsignedType = std::uint64_t,\n    class NumberFloatType = double,\n    template<typename U> class AllocatorType = std::allocator,\n    template<typename T, typename SFINAE = void> class JSONSerializer = adl_serializer,\n    class BinaryType = std::vector<std::uint8_t>,\n    class CustomBaseClass = void\n>\nclass basic_json;\n
    "},{"location":"api/basic_json/#template-parameters","title":"Template parameters","text":"Template parameter Description Derived type ObjectType type for JSON objects object_t ArrayType type for JSON arrays array_t StringType type for JSON strings and object keys string_t BooleanType type for JSON booleans boolean_t NumberIntegerType type for JSON integer numbers number_integer_t NumberUnsignedType type for JSON unsigned integer numbers number_unsigned_t NumberFloatType type for JSON floating-point numbers number_float_t AllocatorType type of the allocator to use JSONSerializer the serializer to resolve internal calls to to_json() and from_json() json_serializer BinaryType type for binary arrays binary_t CustomBaseClass extension point for user code json_base_class_t"},{"location":"api/basic_json/#specializations","title":"Specializations","text":"
    • json - default specialization
    • ordered_json - a specialization that maintains the insertion order of object keys
    "},{"location":"api/basic_json/#iterator-invalidation","title":"Iterator invalidation","text":"

    All operations that add values to an array (push_back , operator+=, emplace_back, insert, and operator[] for a non-existing index) can yield a reallocation, in which case all iterators (including the end() iterator) and all references to the elements are invalidated.

    For ordered_json, also all operations that add a value to an object (push_back, operator+=, emplace, insert, update, and operator[] for a non-existing key) can yield a reallocation, in which case all iterators (including the end() iterator) and all references to the elements are invalidated.

    "},{"location":"api/basic_json/#requirements","title":"Requirements","text":"

    The class satisfies the following concept requirements:

    "},{"location":"api/basic_json/#basic","title":"Basic","text":"
    • DefaultConstructible: JSON values can be default-constructed. The result will be a JSON null value.
    • MoveConstructible: A JSON value can be constructed from an rvalue argument.
    • CopyConstructible: A JSON value can be copy-constructed from an lvalue expression.
    • MoveAssignable: A JSON value can be assigned from an rvalue argument.
    • CopyAssignable: A JSON value can be copy-assigned from an lvalue expression.
    • Destructible: JSON values can be destructed.
    "},{"location":"api/basic_json/#layout","title":"Layout","text":"
    • StandardLayoutType: JSON values have standard layout: All non-static data members are private and standard layout types, the class has no virtual functions or (virtual) base classes.
    "},{"location":"api/basic_json/#library-wide","title":"Library-wide","text":"
    • EqualityComparable: JSON values can be compared with ==, see operator==.
    • LessThanComparable: JSON values can be compared with <, see operator<.
    • Swappable: Any JSON lvalue or rvalue of can be swapped with any lvalue or rvalue of other compatible types, using unqualified function swap.
    • NullablePointer: JSON values can be compared against std::nullptr_t objects which are used to model the null value.
    "},{"location":"api/basic_json/#container","title":"Container","text":"
    • Container: JSON values can be used like STL containers and provide iterator access.
    • ReversibleContainer: JSON values can be used like STL containers and provide reverse iterator access.
    "},{"location":"api/basic_json/#member-types","title":"Member types","text":"
    • adl_serializer - the default serializer
    • value_t - the JSON type enumeration
    • json_pointer - JSON Pointer implementation
    • json_serializer - type of the serializer to for conversions from/to JSON
    • error_handler_t - type to choose behavior on decoding errors
    • cbor_tag_handler_t - type to choose how to handle CBOR tags
    • initializer_list_t - type for initializer lists of basic_json values
    • input_format_t - type to choose the format to parse
    • json_sax_t - type for SAX events
    "},{"location":"api/basic_json/#exceptions","title":"Exceptions","text":"
    • exception - general exception of the basic_json class
      • parse_error - exception indicating a parse error
      • invalid_iterator - exception indicating errors with iterators
      • type_error - exception indicating executing a member function with a wrong type
      • out_of_range - exception indicating access out of the defined range
      • other_error - exception indicating other library errors
    "},{"location":"api/basic_json/#container-types","title":"Container types","text":"Type Definition value_type basic_json reference value_type& const_reference const value_type& difference_type std::ptrdiff_t size_type std::size_t allocator_type AllocatorType<basic_json> pointer std::allocator_traits<allocator_type>::pointer const_pointer std::allocator_traits<allocator_type>::const_pointer iterator LegacyBidirectionalIterator const_iterator constant LegacyBidirectionalIterator reverse_iterator reverse iterator, derived from iterator const_reverse_iterator reverse iterator, derived from const_iterator iteration_proxy helper type for items function"},{"location":"api/basic_json/#json-value-data-types","title":"JSON value data types","text":"
    • array_t - type for arrays
    • binary_t - type for binary arrays
    • boolean_t - type for booleans
    • default_object_comparator_t - default comparator for objects
    • number_float_t - type for numbers (floating-point)
    • number_integer_t - type for numbers (integer)
    • number_unsigned_t - type for numbers (unsigned)
    • object_comparator_t - comparator for objects
    • object_t - type for objects
    • string_t - type for strings
    "},{"location":"api/basic_json/#parser-callback","title":"Parser callback","text":"
    • parse_event_t - parser event types
    • parser_callback_t - per-element parser callback type
    "},{"location":"api/basic_json/#member-functions","title":"Member functions","text":"
    • (constructor)
    • (destructor)
    • operator= - copy assignment
    • array (static) - explicitly create an array
    • binary (static) - explicitly create a binary array
    • object (static) - explicitly create an object
    "},{"location":"api/basic_json/#object-inspection","title":"Object inspection","text":"

    Functions to inspect the type of a JSON value.

    • type - return the type of the JSON value
    • operator value_t - return the type of the JSON value
    • type_name - return the type as string
    • is_primitive - return whether the type is primitive
    • is_structured - return whether the type is structured
    • is_null - return whether the value is null
    • is_boolean - return whether the value is a boolean
    • is_number - return whether the value is a number
    • is_number_integer - return whether the value is an integer number
    • is_number_unsigned - return whether the value is an unsigned integer number
    • is_number_float - return whether the value is a floating-point number
    • is_object - return whether the value is an object
    • is_array - return whether the value is an array
    • is_string - return whether the value is a string
    • is_binary - return whether the value is a binary array
    • is_discarded - return whether the value is discarded

    Optional functions to access the diagnostic positions.

    • start_pos - return the start position of the value
    • end_pos - return the one past the end position of the value
    "},{"location":"api/basic_json/#value-access","title":"Value access","text":"

    Direct access to the stored value of a JSON value.

    • get - get a value
    • get_to - get a value and write it to a destination
    • get_ptr - get a pointer value
    • get_ref - get a reference value
    • operator ValueType - get a value
    • get_binary - get a binary value
    "},{"location":"api/basic_json/#element-access","title":"Element access","text":"

    Access to the JSON value

    • at - access specified element with bounds checking
    • operator[] - access specified element
    • value - access specified object element with default value
    • front - access the first element
    • back - access the last element
    "},{"location":"api/basic_json/#lookup","title":"Lookup","text":"
    • find - find an element in a JSON object
    • count - returns the number of occurrences of a key in a JSON object
    • contains - check the existence of an element in a JSON object
    "},{"location":"api/basic_json/#iterators","title":"Iterators","text":"
    • begin - returns an iterator to the first element
    • cbegin - returns a const iterator to the first element
    • end - returns an iterator to one past the last element
    • cend - returns a const iterator to one past the last element
    • rbegin - returns an iterator to the reverse-beginning
    • rend - returns an iterator to the reverse-end
    • crbegin - returns a const iterator to the reverse-beginning
    • crend - returns a const iterator to the reverse-end
    • items - wrapper to access iterator member functions in range-based for
    "},{"location":"api/basic_json/#capacity","title":"Capacity","text":"
    • empty - checks whether the container is empty
    • size - returns the number of elements
    • max_size - returns the maximum possible number of elements
    "},{"location":"api/basic_json/#modifiers","title":"Modifiers","text":"
    • clear - clears the contents
    • push_back - add a value to an array/object
    • operator+= - add a value to an array/object
    • emplace_back - add a value to an array
    • emplace - add a value to an object if a key does not exist
    • erase - remove elements
    • insert - inserts elements
    • update - updates a JSON object from another object, overwriting existing keys
    • swap - exchanges the values
    "},{"location":"api/basic_json/#lexicographical-comparison-operators","title":"Lexicographical comparison operators","text":"
    • operator== - comparison: equal
    • operator!= - comparison: not equal
    • operator< - comparison: less than
    • operator> - comparison: greater than
    • operator<= - comparison: less than or equal
    • operator>= - comparison: greater than or equal
    • operator<=> - comparison: 3-way
    "},{"location":"api/basic_json/#serialization-dumping","title":"Serialization / Dumping","text":"
    • dump - serialization
    "},{"location":"api/basic_json/#deserialization-parsing","title":"Deserialization / Parsing","text":"
    • parse (static) - deserialize from a compatible input
    • accept (static) - check if the input is valid JSON
    • sax_parse (static) - generate SAX events
    "},{"location":"api/basic_json/#json-pointer-functions","title":"JSON Pointer functions","text":"
    • flatten - return flattened JSON value
    • unflatten - unflatten a previously flattened JSON value
    "},{"location":"api/basic_json/#json-patch-functions","title":"JSON Patch functions","text":"
    • patch - applies a JSON patch
    • patch_inplace - applies a JSON patch in place
    • diff (static) - creates a diff as a JSON patch
    "},{"location":"api/basic_json/#json-merge-patch-functions","title":"JSON Merge Patch functions","text":"
    • merge_patch - applies a JSON Merge Patch
    "},{"location":"api/basic_json/#static-functions","title":"Static functions","text":"
    • meta - returns version information on the library
    • get_allocator - returns the allocator associated with the container
    "},{"location":"api/basic_json/#binary-formats","title":"Binary formats","text":"
    • from_bjdata (static) - create a JSON value from an input in BJData format
    • from_bson (static) - create a JSON value from an input in BSON format
    • from_cbor (static) - create a JSON value from an input in CBOR format
    • from_msgpack (static) - create a JSON value from an input in MessagePack format
    • from_ubjson (static) - create a JSON value from an input in UBJSON format
    • to_bjdata (static) - create a BJData serialization of a given JSON value
    • to_bson (static) - create a BSON serialization of a given JSON value
    • to_cbor (static) - create a CBOR serialization of a given JSON value
    • to_msgpack (static) - create a MessagePack serialization of a given JSON value
    • to_ubjson (static) - create a UBJSON serialization of a given JSON value
    "},{"location":"api/basic_json/#non-member-functions","title":"Non-member functions","text":"
    • operator<<(std::ostream&) - serialize to stream
    • operator>>(std::istream&) - deserialize from stream
    • to_string - user-defined to_string function for JSON values
    "},{"location":"api/basic_json/#literals","title":"Literals","text":"
    • operator\"\"_json - user-defined string literal for JSON values
    "},{"location":"api/basic_json/#helper-classes","title":"Helper classes","text":"
    • std::hash<basic_json> - return a hash value for a JSON object
    • std::swap<basic_json> - exchanges the values of two JSON objects
    "},{"location":"api/basic_json/#examples","title":"Examples","text":"Example

    The example shows how the library is used.

    #include <iostream>\n#include <iomanip>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // create a JSON object\n    json j =\n    {\n        {\"pi\", 3.141},\n        {\"happy\", true},\n        {\"name\", \"Niels\"},\n        {\"nothing\", nullptr},\n        {\n            \"answer\", {\n                {\"everything\", 42}\n            }\n        },\n        {\"list\", {1, 0, 2}},\n        {\n            \"object\", {\n                {\"currency\", \"USD\"},\n                {\"value\", 42.99}\n            }\n        }\n    };\n\n    // add new values\n    j[\"new\"][\"key\"][\"value\"] = {\"another\", \"list\"};\n\n    // count elements\n    auto s = j.size();\n    j[\"size\"] = s;\n\n    // pretty print with indent of 4 spaces\n    std::cout << std::setw(4) << j << '\\n';\n}\n

    Output:

    {\n    \"answer\": {\n        \"everything\": 42\n    },\n    \"happy\": true,\n    \"list\": [\n        1,\n        0,\n        2\n    ],\n    \"name\": \"Niels\",\n    \"new\": {\n        \"key\": {\n            \"value\": [\n                \"another\",\n                \"list\"\n            ]\n        }\n    },\n    \"nothing\": null,\n    \"object\": {\n        \"currency\": \"USD\",\n        \"value\": 42.99\n    },\n    \"pi\": 3.141,\n    \"size\": 8\n}\n
    "},{"location":"api/basic_json/#see-also","title":"See also","text":"
    • RFC 8259: The JavaScript Object Notation (JSON) Data Interchange Format
    "},{"location":"api/basic_json/#version-history","title":"Version history","text":"
    • Added in version 1.0.0.
    "},{"location":"api/basic_json/accept/","title":"nlohmann::basic_json::accept","text":"
    // (1)\ntemplate<typename InputType>\nstatic bool accept(InputType&& i,\n                   const bool ignore_comments = false,\n                   const bool ignore_trailing_commas = false);\n\n// (2)\ntemplate<typename IteratorType>\nstatic bool accept(IteratorType first, IteratorType last,\n                   const bool ignore_comments = false,\n                   const bool ignore_trailing_commas = false);\n

    Checks whether the input is valid JSON.

    1. Reads from a compatible input.

    2. Reads from a pair of character iterators

      The value_type of the iterator must be an integral type with a size of 1, 2, or 4 bytes, which will be interpreted respectively as UTF-8, UTF-16, and UTF-32.

    Unlike the parse() function, this function neither throws an exception in case of invalid JSON input (i.e., a parse error) nor creates diagnostic information.

    "},{"location":"api/basic_json/accept/#template-parameters","title":"Template parameters","text":"InputType

    A compatible input, for instance:

    • an std::istream object
    • a FILE pointer (throws if null)
    • a C-style array of characters
    • a pointer to a null-terminated string of single byte characters (throws if null)
    • a std::string
    • an object obj for which begin(obj) and end(obj) produces a valid pair of iterators.
    IteratorType

    a compatible iterator type, for instance.

    • a pair of std::string::iterator or std::vector<std::uint8_t>::iterator
    • a pair of pointers such as ptr and ptr + len
    "},{"location":"api/basic_json/accept/#parameters","title":"Parameters","text":"i (in) Input to parse from. ignore_comments (in) whether comments should be ignored and treated like whitespace (true) or yield a parse error (false); (optional, false by default) ignore_trailing_commas (in) whether trailing commas in arrays or objects should be ignored and treated like whitespace (true) or yield a parse error (false); (optional, false by default) first (in) iterator to the start of the character range last (in) iterator to the end of the character range"},{"location":"api/basic_json/accept/#return-value","title":"Return value","text":"

    Whether the input is valid JSON.

    "},{"location":"api/basic_json/accept/#exception-safety","title":"Exception safety","text":"

    Strong guarantee: if an exception is thrown, there are no changes in the JSON value.

    "},{"location":"api/basic_json/accept/#exceptions","title":"Exceptions","text":"

    Throws parse_error.101 in case of an empty input like a null FILE* or char* pointer.

    "},{"location":"api/basic_json/accept/#complexity","title":"Complexity","text":"

    Linear in the length of the input. The parser is a predictive LL(1) parser.

    "},{"location":"api/basic_json/accept/#notes","title":"Notes","text":"

    A UTF-8 byte order mark is silently ignored.

    "},{"location":"api/basic_json/accept/#examples","title":"Examples","text":"Example

    The example below demonstrates the accept() function reading from a string.

    #include <iostream>\n#include <iomanip>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // a valid JSON text\n    auto valid_text = R\"(\n    {\n        \"numbers\": [1, 2, 3]\n    }\n    )\";\n\n    // an invalid JSON text\n    auto invalid_text = R\"(\n    {\n        \"strings\": [\"extra\", \"comma\", ]\n    }\n    )\";\n\n    std::cout << std::boolalpha\n              << json::accept(valid_text) << ' '\n              << json::accept(invalid_text) << '\\n';\n}\n

    Output:

    true false\n
    "},{"location":"api/basic_json/accept/#see-also","title":"See also","text":"
    • parse - deserialize from a compatible input
    • operator>> - deserialize from stream
    "},{"location":"api/basic_json/accept/#version-history","title":"Version history","text":"
    • Added in version 3.0.0.
    • Ignoring comments via ignore_comments added in version 3.9.0.
    • Changed runtime assertion in case of FILE* null pointers to exception in version 3.12.0.
    • Added ignore_trailing_commas in version 3.12.1.

    Deprecation

    Overload (2) replaces calls to accept with a pair of iterators as their first parameter which has been deprecated in version 3.8.0. This overload will be removed in version 4.0.0. Please replace all calls like accept({ptr, ptr+len}, ...); with accept(ptr, ptr+len, ...);.

    You should be warned by your compiler with a -Wdeprecated-declarations warning if you are using a deprecated function.

    "},{"location":"api/basic_json/array/","title":"nlohmann::basic_json::array","text":"
    static basic_json array(initializer_list_t init = {});\n

    Creates a JSON array value from a given initializer list. That is, given a list of values a, b, c, creates the JSON value [a, b, c]. If the initializer list is empty, the empty array [] is created.

    "},{"location":"api/basic_json/array/#parameters","title":"Parameters","text":"init (in) initializer list with JSON values to create an array from (optional)"},{"location":"api/basic_json/array/#return-value","title":"Return value","text":"

    JSON array value

    "},{"location":"api/basic_json/array/#exception-safety","title":"Exception safety","text":"

    Strong guarantee: if an exception is thrown, there are no changes in the JSON value.

    "},{"location":"api/basic_json/array/#complexity","title":"Complexity","text":"

    Linear in the size of init.

    "},{"location":"api/basic_json/array/#notes","title":"Notes","text":"

    This function is only needed to express two edge cases that cannot be realized with the initializer list constructor (basic_json(initializer_list_t, bool, value_t)). These cases are:

    1. creating an array whose elements are all pairs whose first element is a string -- in this case, the initializer list constructor would create an object, taking the first elements as keys
    2. creating an empty array -- passing the empty initializer list to the initializer list constructor yields an empty object
    "},{"location":"api/basic_json/array/#examples","title":"Examples","text":"Example

    The following code shows an example for the array function.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // create JSON arrays\n    json j_no_init_list = json::array();\n    json j_empty_init_list = json::array({});\n    json j_nonempty_init_list = json::array({1, 2, 3, 4});\n    json j_list_of_pairs = json::array({ {\"one\", 1}, {\"two\", 2} });\n\n    // serialize the JSON arrays\n    std::cout << j_no_init_list << '\\n';\n    std::cout << j_empty_init_list << '\\n';\n    std::cout << j_nonempty_init_list << '\\n';\n    std::cout << j_list_of_pairs << '\\n';\n}\n

    Output:

    []\n[]\n[1,2,3,4]\n[[\"one\",1],[\"two\",2]]\n
    "},{"location":"api/basic_json/array/#see-also","title":"See also","text":"
    • basic_json(initializer_list_t) - create a JSON value from an initializer list
    • object - create a JSON object value from an initializer list
    "},{"location":"api/basic_json/array/#version-history","title":"Version history","text":"
    • Added in version 1.0.0.
    "},{"location":"api/basic_json/array_t/","title":"nlohmann::basic_json::array_t","text":"
    using array_t = ArrayType<basic_json, AllocatorType<basic_json>>;\n

    The type used to store JSON arrays.

    RFC 8259 describes JSON arrays as follows:

    An array is an ordered sequence of zero or more values.

    To store objects in C++, a type is defined by the template parameters explained below.

    "},{"location":"api/basic_json/array_t/#template-parameters","title":"Template parameters","text":"ArrayType container type to store arrays (e.g., std::vector or std::list) AllocatorType the allocator to use for objects (e.g., std::allocator)"},{"location":"api/basic_json/array_t/#notes","title":"Notes","text":""},{"location":"api/basic_json/array_t/#default-type","title":"Default type","text":"

    With the default values for ArrayType (std::vector) and AllocatorType (std::allocator), the default value for array_t is:

    std::vector<\n  basic_json, // value_type\n  std::allocator<basic_json> // allocator_type\n>\n
    "},{"location":"api/basic_json/array_t/#limits","title":"Limits","text":"

    RFC 8259 specifies:

    An implementation may set limits on the maximum depth of nesting.

    In this class, the array's limit of nesting is not explicitly constrained. However, a maximum depth of nesting may be introduced by the compiler or runtime environment. A theoretical limit can be queried by calling the max_size function of a JSON array.

    "},{"location":"api/basic_json/array_t/#storage","title":"Storage","text":"

    Arrays are stored as pointers in a basic_json type. That is, for any access to array values, a pointer of type array_t* must be dereferenced.

    "},{"location":"api/basic_json/array_t/#examples","title":"Examples","text":"Example

    The following code shows that array_t is by default, a typedef to std::vector<nlohmann::json>.

    #include <iostream>\n#include <iomanip>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    std::cout << std::boolalpha << std::is_same<std::vector<json>, json::array_t>::value << std::endl;\n}\n

    Output:

    true\n
    "},{"location":"api/basic_json/array_t/#version-history","title":"Version history","text":"
    • Added in version 1.0.0.
    "},{"location":"api/basic_json/at/","title":"nlohmann::basic_json::at","text":"
    // (1)\nreference at(size_type idx);\nconst_reference at(size_type idx) const;\n\n// (2)\nreference at(const typename object_t::key_type& key);\nconst_reference at(const typename object_t::key_type& key) const;\n\n// (3)\ntemplate<typename KeyType>\nreference at(KeyType&& key);\ntemplate<typename KeyType>\nconst_reference at(KeyType&& key) const;\n\n// (4)\nreference at(const json_pointer& ptr);\nconst_reference at(const json_pointer& ptr) const;\n
    1. Returns a reference to the array element at specified location idx, with bounds checking.
    2. Returns a reference to the object element with specified key key, with bounds checking.
    3. See 2. This overload is only available if KeyType is comparable with typename object_t::key_type and typename object_comparator_t::is_transparent denotes a type.
    4. Returns a reference to the element at specified JSON pointer ptr, with bounds checking.
    "},{"location":"api/basic_json/at/#template-parameters","title":"Template parameters","text":"KeyType A type for an object key other than json_pointer that is comparable with string_t using object_comparator_t. This can also be a string view (C++17)."},{"location":"api/basic_json/at/#parameters","title":"Parameters","text":"idx (in) index of the element to access key (in) object key of the elements to access ptr (in) JSON pointer to the desired element"},{"location":"api/basic_json/at/#return-value","title":"Return value","text":"
    1. reference to the element at index idx
    2. reference to the element at key key
    3. reference to the element at key key
    4. reference to the element pointed to by ptr
    "},{"location":"api/basic_json/at/#exception-safety","title":"Exception safety","text":"

    Strong exception safety: if an exception occurs, the original value stays intact.

    "},{"location":"api/basic_json/at/#exceptions","title":"Exceptions","text":"
    1. The function can throw the following exceptions:
      • Throws type_error.304 if the JSON value is not an array; in this case, calling at with an index makes no sense. See the example below.
      • Throws out_of_range.401 if the index idx is out of range of the array; that is, idx >= size(). See the example below.
    2. The function can throw the following exceptions:
      • Throws type_error.304 if the JSON value is not an object; in this case, calling at with a key makes no sense. See the example below.
      • Throws out_of_range.403 if the key key is not stored in the object; that is, find(key) == end(). See the example below.
    3. See 2.
    4. The function can throw the following exceptions:
      • Throws parse_error.106 if an array index in the passed JSON pointer ptr begins with '0'. See the example below.
      • Throws parse_error.109 if an array index in the passed JSON pointer ptr is not a number. See the example below.
      • Throws out_of_range.401 if an array index in the passed JSON pointer ptr is out of range. See the example below.
      • Throws out_of_range.402 if the array index '-' is used in the passed JSON pointer ptr. As at provides checked access (and no elements are implicitly inserted), the index '-' is always invalid. See the example below.
      • Throws out_of_range.403 if the JSON pointer describes a key of an object which cannot be found. See the example below.
      • Throws out_of_range.404 if the JSON pointer ptr can not be resolved. See the example below.
    "},{"location":"api/basic_json/at/#complexity","title":"Complexity","text":"
    1. Constant.
    2. Logarithmic in the size of the container.
    3. Logarithmic in the size of the container.
    4. Logarithmic in the size of the container.
    "},{"location":"api/basic_json/at/#examples","title":"Examples","text":"Example: (1) access specified array element with bounds checking

    The example below shows how array elements can be read and written using at(). It also demonstrates the different exceptions that can be thrown.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // create JSON array\n    json array = {\"first\", \"2nd\", \"third\", \"fourth\"};\n\n    // output element at index 2 (third element)\n    std::cout << array.at(2) << '\\n';\n\n    // change element at index 1 (second element) to \"second\"\n    array.at(1) = \"second\";\n\n    // output changed array\n    std::cout << array << '\\n';\n\n    // exception type_error.304\n    try\n    {\n        // use at() on a non-array type\n        json str = \"I am a string\";\n        str.at(0) = \"Another string\";\n    }\n    catch (const json::type_error& e)\n    {\n        std::cout << e.what() << '\\n';\n    }\n\n    // exception out_of_range.401\n    try\n    {\n        // try to write beyond the array limit\n        array.at(5) = \"sixth\";\n    }\n    catch (const json::out_of_range& e)\n    {\n        std::cout << e.what() << '\\n';\n    }\n}\n

    Output:

    \"third\"\n[\"first\",\"second\",\"third\",\"fourth\"]\n[json.exception.type_error.304] cannot use at() with string\n[json.exception.out_of_range.401] array index 5 is out of range\n
    Example: (1) access specified array element with bounds checking

    The example below shows how array elements can be read using at(). It also demonstrates the different exceptions that can be thrown.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // create JSON array\n    const json array = {\"first\", \"2nd\", \"third\", \"fourth\"};\n\n    // output element at index 2 (third element)\n    std::cout << array.at(2) << '\\n';\n\n    // exception type_error.304\n    try\n    {\n        // use at() on a non-array type\n        const json str = \"I am a string\";\n        std::cout << str.at(0) << '\\n';\n    }\n    catch (const json::type_error& e)\n    {\n        std::cout << e.what() << '\\n';\n    }\n\n    // exception out_of_range.401\n    try\n    {\n        // try to read beyond the array limit\n        std::cout << array.at(5) << '\\n';\n    }\n    catch (const json::out_of_range& e)\n    {\n        std::cout << e.what() << '\\n';\n    }\n}\n

    Output:

    \"third\"\n[json.exception.type_error.304] cannot use at() with string\n[json.exception.out_of_range.401] array index 5 is out of range\n
    Example: (2) access specified object element with bounds checking

    The example below shows how object elements can be read and written using at(). It also demonstrates the different exceptions that can be thrown.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // create JSON object\n    json object =\n    {\n        {\"the good\", \"il buono\"},\n        {\"the bad\", \"il cattivo\"},\n        {\"the ugly\", \"il brutto\"}\n    };\n\n    // output element with key \"the ugly\"\n    std::cout << object.at(\"the ugly\") << '\\n';\n\n    // change element with key \"the bad\"\n    object.at(\"the bad\") = \"il cattivo\";\n\n    // output changed array\n    std::cout << object << '\\n';\n\n    // exception type_error.304\n    try\n    {\n        // use at() on a non-object type\n        json str = \"I am a string\";\n        str.at(\"the good\") = \"Another string\";\n    }\n    catch (const json::type_error& e)\n    {\n        std::cout << e.what() << '\\n';\n    }\n\n    // exception out_of_range.401\n    try\n    {\n        // try to write at a nonexisting key\n        object.at(\"the fast\") = \"il rapido\";\n    }\n    catch (const json::out_of_range& e)\n    {\n        std::cout << e.what() << '\\n';\n    }\n}\n

    Output:

    \"il brutto\"\n{\"the bad\":\"il cattivo\",\"the good\":\"il buono\",\"the ugly\":\"il brutto\"}\n[json.exception.type_error.304] cannot use at() with string\n[json.exception.out_of_range.403] key 'the fast' not found\n
    Example: (2) access specified object element with bounds checking

    The example below shows how object elements can be read using at(). It also demonstrates the different exceptions that can be thrown.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // create JSON object\n    const json object =\n    {\n        {\"the good\", \"il buono\"},\n        {\"the bad\", \"il cattivo\"},\n        {\"the ugly\", \"il brutto\"}\n    };\n\n    // output element with key \"the ugly\"\n    std::cout << object.at(\"the ugly\") << '\\n';\n\n    // exception type_error.304\n    try\n    {\n        // use at() on a non-object type\n        const json str = \"I am a string\";\n        std::cout << str.at(\"the good\") << '\\n';\n    }\n    catch (const json::type_error& e)\n    {\n        std::cout << e.what() << '\\n';\n    }\n\n    // exception out_of_range.401\n    try\n    {\n        // try to read from a nonexisting key\n        std::cout << object.at(\"the fast\") << '\\n';\n    }\n    catch (const json::out_of_range)\n    {\n        std::cout << \"out of range\" << '\\n';\n    }\n}\n

    Output:

    \"il brutto\"\n[json.exception.type_error.304] cannot use at() with string\nout of range\n
    Example: (3) access specified object element using string_view with bounds checking

    The example below shows how object elements can be read and written using at(). It also demonstrates the different exceptions that can be thrown.

    #include <iostream>\n#include <string_view>\n#include <nlohmann/json.hpp>\n\nusing namespace std::string_view_literals;\nusing json = nlohmann::json;\n\nint main()\n{\n    // create JSON object\n    json object =\n    {\n        {\"the good\", \"il buono\"},\n        {\"the bad\", \"il cattivo\"},\n        {\"the ugly\", \"il brutto\"}\n    };\n\n    // output element with key \"the ugly\" using string_view\n    std::cout << object.at(\"the ugly\"sv) << '\\n';\n\n    // change element with key \"the bad\" using string_view\n    object.at(\"the bad\"sv) = \"il cattivo\";\n\n    // output changed array\n    std::cout << object << '\\n';\n\n    // exception type_error.304\n    try\n    {\n        // use at() with string_view on a non-object type\n        json str = \"I am a string\";\n        str.at(\"the good\"sv) = \"Another string\";\n    }\n    catch (const json::type_error& e)\n    {\n        std::cout << e.what() << '\\n';\n    }\n\n    // exception out_of_range.401\n    try\n    {\n        // try to write at a nonexisting key using string_view\n        object.at(\"the fast\"sv) = \"il rapido\";\n    }\n    catch (const json::out_of_range& e)\n    {\n        std::cout << e.what() << '\\n';\n    }\n}\n

    Output:

    \"il brutto\"\n{\"the bad\":\"il cattivo\",\"the good\":\"il buono\",\"the ugly\":\"il brutto\"}\n[json.exception.type_error.304] cannot use at() with string\n[json.exception.out_of_range.403] key 'the fast' not found\n
    Example: (3) access specified object element using string_view with bounds checking

    The example below shows how object elements can be read using at(). It also demonstrates the different exceptions that can be thrown.

    #include <iostream>\n#include <string_view>\n#include <nlohmann/json.hpp>\n\nusing namespace std::string_view_literals;\nusing json = nlohmann::json;\n\nint main()\n{\n    // create JSON object\n    const json object =\n    {\n        {\"the good\", \"il buono\"},\n        {\"the bad\", \"il cattivo\"},\n        {\"the ugly\", \"il brutto\"}\n    };\n\n    // output element with key \"the ugly\" using string_view\n    std::cout << object.at(\"the ugly\"sv) << '\\n';\n\n    // exception type_error.304\n    try\n    {\n        // use at() with string_view on a non-object type\n        const json str = \"I am a string\";\n        std::cout << str.at(\"the good\"sv) << '\\n';\n    }\n    catch (const json::type_error& e)\n    {\n        std::cout << e.what() << '\\n';\n    }\n\n    // exception out_of_range.401\n    try\n    {\n        // try to read from a nonexisting key using string_view\n        std::cout << object.at(\"the fast\"sv) << '\\n';\n    }\n    catch (const json::out_of_range& e)\n    {\n        std::cout << \"out of range\" << '\\n';\n    }\n}\n

    Output:

    \"il brutto\"\n[json.exception.type_error.304] cannot use at() with string\nout of range\n
    Example: (4) access specified element via JSON Pointer

    The example below shows how object elements can be read and written using at(). It also demonstrates the different exceptions that can be thrown.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\nusing namespace nlohmann::literals;\n\nint main()\n{\n    // create a JSON value\n    json j =\n    {\n        {\"number\", 1}, {\"string\", \"foo\"}, {\"array\", {1, 2}}\n    };\n\n    // read-only access\n\n    // output element with JSON pointer \"/number\"\n    std::cout << j.at(\"/number\"_json_pointer) << '\\n';\n    // output element with JSON pointer \"/string\"\n    std::cout << j.at(\"/string\"_json_pointer) << '\\n';\n    // output element with JSON pointer \"/array\"\n    std::cout << j.at(\"/array\"_json_pointer) << '\\n';\n    // output element with JSON pointer \"/array/1\"\n    std::cout << j.at(\"/array/1\"_json_pointer) << '\\n';\n\n    // writing access\n\n    // change the string\n    j.at(\"/string\"_json_pointer) = \"bar\";\n    // output the changed string\n    std::cout << j[\"string\"] << '\\n';\n\n    // change an array element\n    j.at(\"/array/1\"_json_pointer) = 21;\n    // output the changed array\n    std::cout << j[\"array\"] << '\\n';\n\n    // out_of_range.106\n    try\n    {\n        // try to use an array index with leading '0'\n        json::reference ref = j.at(\"/array/01\"_json_pointer);\n    }\n    catch (const json::parse_error& e)\n    {\n        std::cout << e.what() << '\\n';\n    }\n\n    // out_of_range.109\n    try\n    {\n        // try to use an array index that is not a number\n        json::reference ref = j.at(\"/array/one\"_json_pointer);\n    }\n    catch (const json::parse_error& e)\n    {\n        std::cout << e.what() << '\\n';\n    }\n\n    // out_of_range.401\n    try\n    {\n        // try to use an invalid array index\n        json::reference ref = j.at(\"/array/4\"_json_pointer);\n    }\n    catch (const json::out_of_range& e)\n    {\n        std::cout << e.what() << '\\n';\n    }\n\n    // out_of_range.402\n    try\n    {\n        // try to use the array index '-'\n        json::reference ref = j.at(\"/array/-\"_json_pointer);\n    }\n    catch (const json::out_of_range& e)\n    {\n        std::cout << e.what() << '\\n';\n    }\n\n    // out_of_range.403\n    try\n    {\n        // try to use a JSON pointer to a nonexistent object key\n        json::const_reference ref = j.at(\"/foo\"_json_pointer);\n    }\n    catch (const json::out_of_range& e)\n    {\n        std::cout << e.what() << '\\n';\n    }\n\n    // out_of_range.404\n    try\n    {\n        // try to use a JSON pointer that cannot be resolved\n        json::reference ref = j.at(\"/number/foo\"_json_pointer);\n    }\n    catch (const json::out_of_range& e)\n    {\n        std::cout << e.what() << '\\n';\n    }\n}\n

    Output:

    1\n\"foo\"\n[1,2]\n2\n\"bar\"\n[1,21]\n[json.exception.parse_error.106] parse error: array index '01' must not begin with '0'\n[json.exception.parse_error.109] parse error: array index 'one' is not a number\n[json.exception.out_of_range.401] array index 4 is out of range\n[json.exception.out_of_range.402] array index '-' (2) is out of range\n[json.exception.out_of_range.403] key 'foo' not found\n[json.exception.out_of_range.404] unresolved reference token 'foo'\n
    Example: (4) access specified element via JSON Pointer

    The example below shows how object elements can be read using at(). It also demonstrates the different exceptions that can be thrown.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\nusing namespace nlohmann::literals;\n\nint main()\n{\n    // create a JSON value\n    const json j =\n    {\n        {\"number\", 1}, {\"string\", \"foo\"}, {\"array\", {1, 2}}\n    };\n\n    // read-only access\n\n    // output element with JSON pointer \"/number\"\n    std::cout << j.at(\"/number\"_json_pointer) << '\\n';\n    // output element with JSON pointer \"/string\"\n    std::cout << j.at(\"/string\"_json_pointer) << '\\n';\n    // output element with JSON pointer \"/array\"\n    std::cout << j.at(\"/array\"_json_pointer) << '\\n';\n    // output element with JSON pointer \"/array/1\"\n    std::cout << j.at(\"/array/1\"_json_pointer) << '\\n';\n\n    // out_of_range.109\n    try\n    {\n        // try to use an array index that is not a number\n        json::const_reference ref = j.at(\"/array/one\"_json_pointer);\n    }\n    catch (const json::parse_error& e)\n    {\n        std::cout << e.what() << '\\n';\n    }\n\n    // out_of_range.401\n    try\n    {\n        // try to use an invalid array index\n        json::const_reference ref = j.at(\"/array/4\"_json_pointer);\n    }\n    catch (const json::out_of_range& e)\n    {\n        std::cout << e.what() << '\\n';\n    }\n\n    // out_of_range.402\n    try\n    {\n        // try to use the array index '-'\n        json::const_reference ref = j.at(\"/array/-\"_json_pointer);\n    }\n    catch (const json::out_of_range& e)\n    {\n        std::cout << e.what() << '\\n';\n    }\n\n    // out_of_range.403\n    try\n    {\n        // try to use a JSON pointer to a nonexistent object key\n        json::const_reference ref = j.at(\"/foo\"_json_pointer);\n    }\n    catch (const json::out_of_range& e)\n    {\n        std::cout << e.what() << '\\n';\n    }\n\n    // out_of_range.404\n    try\n    {\n        // try to use a JSON pointer that cannot be resolved\n        json::const_reference ref = j.at(\"/number/foo\"_json_pointer);\n    }\n    catch (const json::out_of_range& e)\n    {\n        std::cout << e.what() << '\\n';\n    }\n}\n

    Output:

    1\n\"foo\"\n[1,2]\n2\n[json.exception.parse_error.109] parse error: array index 'one' is not a number\n[json.exception.out_of_range.401] array index 4 is out of range\n[json.exception.out_of_range.402] array index '-' (2) is out of range\n[json.exception.out_of_range.403] key 'foo' not found\n[json.exception.out_of_range.404] unresolved reference token 'foo'\n
    "},{"location":"api/basic_json/at/#see-also","title":"See also","text":"
    • documentation on checked access
    • operator[] for unchecked access by reference
    • value for access with default value
    "},{"location":"api/basic_json/at/#version-history","title":"Version history","text":"
    1. Added in version 1.0.0.
    2. Added in version 1.0.0.
    3. Added in version 3.11.0.
    4. Added in version 2.0.0.
    "},{"location":"api/basic_json/back/","title":"nlohmann::basic_json::back","text":"
    reference back();\n\nconst_reference back() const;\n

    Returns a reference to the last element in the container. For a JSON container c, the expression c.back() is equivalent to

    auto tmp = c.end();\n--tmp;\nreturn *tmp;\n
    "},{"location":"api/basic_json/back/#return-value","title":"Return value","text":"

    In the case of a structured type (array or object), a reference to the last element is returned. In the case of number, string, boolean, or binary values, a reference to the value is returned.

    "},{"location":"api/basic_json/back/#exception-safety","title":"Exception safety","text":"

    Strong guarantee: if an exception is thrown, there are no changes in the JSON value.

    "},{"location":"api/basic_json/back/#exceptions","title":"Exceptions","text":"

    If the JSON value is null, exception invalid_iterator.214 is thrown.

    "},{"location":"api/basic_json/back/#complexity","title":"Complexity","text":"

    Constant.

    "},{"location":"api/basic_json/back/#notes","title":"Notes","text":"

    Precondition

    The array or object must not be empty. Calling back on an empty array or object yields undefined behavior.

    "},{"location":"api/basic_json/back/#examples","title":"Examples","text":"Example

    The following code shows an example for back().

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // create JSON values\n    json j_boolean = true;\n    json j_number_integer = 17;\n    json j_number_float = 23.42;\n    json j_object = {{\"one\", 1}, {\"two\", 2}};\n    json j_object_empty(json::value_t::object);\n    json j_array = {1, 2, 4, 8, 16};\n    json j_array_empty(json::value_t::array);\n    json j_string = \"Hello, world\";\n\n    // call back()\n    std::cout << j_boolean.back() << '\\n';\n    std::cout << j_number_integer.back() << '\\n';\n    std::cout << j_number_float.back() << '\\n';\n    std::cout << j_object.back() << '\\n';\n    //std::cout << j_object_empty.back() << '\\n';  // undefined behavior\n    std::cout << j_array.back() << '\\n';\n    //std::cout << j_array_empty.back() << '\\n';   // undefined behavior\n    std::cout << j_string.back() << '\\n';\n\n    // back() called on a null value\n    try\n    {\n        json j_null;\n        j_null.back();\n    }\n    catch (const json::invalid_iterator& e)\n    {\n        std::cout << e.what() << '\\n';\n    }\n}\n

    Output:

    true\n17\n23.42\n2\n16\n\"Hello, world\"\n[json.exception.invalid_iterator.214] cannot get value\n
    "},{"location":"api/basic_json/back/#see-also","title":"See also","text":"
    • front to access the first element
    "},{"location":"api/basic_json/back/#version-history","title":"Version history","text":"
    • Added in version 1.0.0.
    • Adjusted code to return reference to binary values in version 3.8.0.
    "},{"location":"api/basic_json/basic_json/","title":"nlohmann::basic_json::basic_json","text":"
    // (1)\nbasic_json(const value_t v);\n\n// (2)\nbasic_json(std::nullptr_t = nullptr) noexcept;\n\n// (3)\ntemplate<typename CompatibleType>\nbasic_json(CompatibleType&& val) noexcept(noexcept(\n           JSONSerializer<U>::to_json(std::declval<basic_json_t&>(),\n                                      std::forward<CompatibleType>(val))));\n\n// (4)\ntemplate<typename BasicJsonType>\nbasic_json(const BasicJsonType& val);\n\n// (5)\nbasic_json(initializer_list_t init,\n           bool type_deduction = true,\n           value_t manual_type = value_t::array);\n\n// (6)\nbasic_json(size_type cnt, const basic_json& val);\n\n// (7)\nbasic_json(iterator first, iterator last);\nbasic_json(const_iterator first, const_iterator last);\n\n// (8)\nbasic_json(const basic_json& other);\n\n// (9)\nbasic_json(basic_json&& other) noexcept;\n

    1. Create an empty JSON value with a given type. The value will be default initialized with an empty value which depends on the type:

      Value type initial value null null boolean false string \"\" number 0 object {} array [] binary empty array

      The postcondition of this constructor can be restored by calling clear().

    2. Create a null JSON value. It either takes a null pointer as parameter (explicitly creating null) or no parameter (implicitly creating null). The passed null pointer itself is not read -- it is only used to choose the right constructor.

    3. This is a \"catch all\" constructor for all compatible JSON types; that is, types for which a to_json() method exists. The constructor forwards the parameter val to that method (to json_serializer<U>::to_json method with U = uncvref_t<CompatibleType>, to be exact).

      Template type CompatibleType includes, but is not limited to, the following types:

      • arrays: array_t and all kinds of compatible containers such as std::vector, std::deque, std::list, std::forward_list, std::array, std::valarray, std::set, std::unordered_set, std::multiset, and std::unordered_multiset with a value_type from which a basic_json value can be constructed.
      • objects: object_t and all kinds of compatible associative containers such as std::map, std::unordered_map, std::multimap, and std::unordered_multimap with a key_type compatible to string_t and a value_type from which a basic_json value can be constructed.
      • strings: string_t, string literals, and all compatible string containers can be used.
      • numbers: number_integer_t, number_unsigned_t, number_float_t, and all convertible number types such as int, size_t, int64_t, float or double can be used.
      • boolean: boolean_t / bool can be used.
      • binary: binary_t / std::vector<uint8_t> may be used; unfortunately because string literals cannot be distinguished from binary character arrays by the C++ type system, all types compatible with const char* will be directed to the string constructor instead. This is both for backwards compatibility and due to the fact that a binary type is not a standard JSON type.

      See the examples below.

    4. This is a constructor for existing basic_json types. It does not hijack copy/move constructors, since the parameter has different template arguments than the current ones.

      The constructor tries to convert the internal m_value of the parameter.

    5. Creates a JSON value of type array or object from the passed initializer list init. In case type_deduction is true (default), the type of the JSON value to be created is deducted from the initializer list init according to the following rules:

      1. If the list is empty, an empty JSON object value {} is created.
      2. If the list consists of pairs whose first element is a string, a JSON object value is created where the first elements of the pairs are treated as keys and the second elements are as values.
      3. In all other cases, an array is created.

      The rules aim to create the best fit between a C++ initializer list and JSON values. The rationale is as follows:

      1. The empty initializer list is written as {} which is exactly an empty JSON object.
      2. C++ has no way of describing mapped types other than to list a list of pairs. As JSON requires that keys must be of type string, rule 2 is the weakest constraint one can pose on initializer lists to interpret them as an object.
      3. In all other cases, the initializer list could not be interpreted as a JSON object type, so interpreting it as a JSON array type is safe.

      With the rules described above, the following JSON values cannot be expressed by an initializer list:

      • the empty array ([]): use array(initializer_list_t) with an empty initializer list in this case
      • arrays whose elements satisfy rule 2: use array(initializer_list_t) with the same initializer list in this case

      Function array() and object() force array and object creation from initializer lists, respectively.

    6. Constructs a JSON array value by creating cnt copies of a passed value. In case cnt is 0, an empty array is created.

    7. Constructs the JSON value with the contents of the range [first, last). The semantics depend on the different types a JSON value can have:

      • In case of a null type, invalid_iterator.206 is thrown.
      • In case of other primitive types (number, boolean, or string), first must be begin() and last must be end(). In this case, the value is copied. Otherwise, invalid_iterator.204 is thrown.
      • In case of structured types (array, object), the constructor behaves as similar versions for std::vector or std::map; that is, a JSON array or object is constructed from the values in the range.

    8. Creates a copy of a given JSON value.

    9. Move constructor. Constructs a JSON value with the contents of the given value other using move semantics. It \"steals\" the resources from other and leaves it as JSON null value.

    "},{"location":"api/basic_json/basic_json/#template-parameters","title":"Template parameters","text":"CompatibleType

    a type such that:

    • CompatibleType is not derived from std::istream,
    • CompatibleType is not basic_json (to avoid hijacking copy/move constructors),
    • CompatibleType is not a different basic_json type (i.e. with different template arguments)
    • CompatibleType is not a basic_json nested type (e.g., json_pointer, iterator, etc.)
    • json_serializer<U> (with U = uncvref_t<CompatibleType>) has a to_json(basic_json_t&, CompatibleType&&) method
    BasicJsonType:

    a type such that:

    • BasicJsonType is a basic_json type.
    • BasicJsonType has different template arguments than basic_json_t.
    U: uncvref_t<CompatibleType>"},{"location":"api/basic_json/basic_json/#parameters","title":"Parameters","text":"v (in) the type of the value to create val (in) the value to be forwarded to the respective constructor init (in) initializer list with JSON values type_deduction (in) internal parameter; when set to true, the type of the JSON value is deducted from the initializer list init; when set to false, the type provided via manual_type is forced. This mode is used by the functions array(initializer_list_t) and object(initializer_list_t). manual_type (in) internal parameter; when type_deduction is set to false, the created JSON value will use the provided type (only value_t::array and value_t::object are valid); when type_deduction is set to true, this parameter has no effect cnt (in) the number of JSON copies of val to create first (in) the beginning of the range to copy from (included) last (in) the end of the range to copy from (excluded) other (in) the JSON value to copy/move"},{"location":"api/basic_json/basic_json/#exception-safety","title":"Exception safety","text":"
    1. Strong guarantee: if an exception is thrown, there are no changes to any JSON value.
    2. No-throw guarantee: this constructor never throws exceptions.
    3. Depends on the called constructor. For types directly supported by the library (i.e., all types for which no to_json() function was provided), a strong guarantee holds: if an exception is thrown, there are no changes to any JSON value.
    4. Depends on the called constructor. For types directly supported by the library (i.e., all types for which no to_json() function was provided), a strong guarantee holds: if an exception is thrown, there are no changes to any JSON value.
    5. Strong guarantee: if an exception is thrown, there are no changes to any JSON value.
    6. Strong guarantee: if an exception is thrown, there are no changes to any JSON value.
    7. Strong guarantee: if an exception is thrown, there are no changes to any JSON value.
    8. Strong guarantee: if an exception is thrown, there are no changes to any JSON value.
    9. No-throw guarantee: this constructor never throws exceptions.
    "},{"location":"api/basic_json/basic_json/#exceptions","title":"Exceptions","text":"
    1. (none)
    2. The function does not throw exceptions.
    3. (none)
    4. (none)
    5. The function can throw the following exceptions:
      • Throws type_error.301 if type_deduction is false, manual_type is value_t::object, but init contains an element which is not a pair whose first element is a string. In this case, the constructor could not create an object. If type_deduction would have been true, an array would have been created. See object(initializer_list_t) for an example.
    6. (none)
    7. The function can throw the following exceptions:
      • Throws invalid_iterator.201 if iterators first and last are not compatible (i.e., do not belong to the same JSON value). In this case, the range [first, last) is undefined.
      • Throws invalid_iterator.204 if iterators first and last belong to a primitive type (number, boolean, or string), but first does not point to the first element anymore. In this case, the range [first, last) is undefined. See the example code below.
      • Throws invalid_iterator.206 if iterators first and last belong to a null value. In this case, the range [first, last) is undefined.
    8. (none)
    9. The function does not throw exceptions.
    "},{"location":"api/basic_json/basic_json/#complexity","title":"Complexity","text":"
    1. Constant.
    2. Constant.
    3. Usually linear in the size of the passed val, also depending on the implementation of the called to_json() method.
    4. Usually linear in the size of the passed val, also depending on the implementation of the called to_json() method.
    5. Linear in the size of the initializer list init.
    6. Linear in cnt.
    7. Linear in distance between first and last.
    8. Linear in the size of other.
    9. Constant.
    "},{"location":"api/basic_json/basic_json/#notes","title":"Notes","text":"

    • Overload 5:

      Empty initializer list

      When used without parentheses around an empty initializer list, basic_json() is called instead of this function, yielding the JSON null value.

    • Overload 7:

      Preconditions

      • Iterators first and last must be initialized. **This precondition is enforced with a runtime assertion.
      • Range [first, last) is valid. Usually, this precondition cannot be checked efficiently. Only certain edge cases are detected; see the description of the exceptions above. A violation of this precondition yields undefined behavior.

      Runtime assertion

      A precondition is enforced with a runtime assertion.

    • Overload 8:

      Postcondition

      *this == other

    • Overload 9:

      Postconditions

      • `*this has the same value as other before the call.
      • other is a JSON null value
    "},{"location":"api/basic_json/basic_json/#examples","title":"Examples","text":"Example: (1) create an empty value with a given type

    The following code shows the constructor for different value_t values.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // create the different JSON values with default values\n    json j_null(json::value_t::null);\n    json j_boolean(json::value_t::boolean);\n    json j_number_integer(json::value_t::number_integer);\n    json j_number_float(json::value_t::number_float);\n    json j_object(json::value_t::object);\n    json j_array(json::value_t::array);\n    json j_string(json::value_t::string);\n\n    // serialize the JSON values\n    std::cout << j_null << '\\n';\n    std::cout << j_boolean << '\\n';\n    std::cout << j_number_integer << '\\n';\n    std::cout << j_number_float << '\\n';\n    std::cout << j_object << '\\n';\n    std::cout << j_array << '\\n';\n    std::cout << j_string << '\\n';\n}\n

    Output:

    null\nfalse\n0\n0.0\n{}\n[]\n\"\"\n
    Example: (2) create a null object

    The following code shows the constructor with and without a null pointer parameter.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // implicitly create a JSON null value\n    json j1;\n\n    // explicitly create a JSON null value\n    json j2(nullptr);\n\n    // serialize the JSON null value\n    std::cout << j1 << '\\n' << j2 << '\\n';\n}\n

    Output:

    null\nnull\n
    Example: (3) create a JSON value from compatible types

    The following code shows the constructor with several compatible types.

    #include <iostream>\n#include <deque>\n#include <list>\n#include <forward_list>\n#include <set>\n#include <unordered_map>\n#include <unordered_set>\n#include <valarray>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // ============\n    // object types\n    // ============\n\n    // create an object from an object_t value\n    json::object_t object_value = { {\"one\", 1}, {\"two\", 2} };\n    json j_object_t(object_value);\n\n    // create an object from std::map\n    std::map<std::string, int> c_map\n    {\n        {\"one\", 1}, {\"two\", 2}, {\"three\", 3}\n    };\n    json j_map(c_map);\n\n    // create an object from std::unordered_map\n    std::unordered_map<const char*, double> c_umap\n    {\n        {\"one\", 1.2}, {\"two\", 2.3}, {\"three\", 3.4}\n    };\n    json j_umap(c_umap);\n\n    // create an object from std::multimap\n    std::multimap<std::string, bool> c_mmap\n    {\n        {\"one\", true}, {\"two\", true}, {\"three\", false}, {\"three\", true}\n    };\n    json j_mmap(c_mmap); // only one entry for key \"three\" is used\n\n    // create an object from std::unordered_multimap\n    std::unordered_multimap<std::string, bool> c_ummap\n    {\n        {\"one\", true}, {\"two\", true}, {\"three\", false}, {\"three\", true}\n    };\n    json j_ummap(c_ummap); // only one entry for key \"three\" is used\n\n    // serialize the JSON objects\n    std::cout << j_object_t << '\\n';\n    std::cout << j_map << '\\n';\n    std::cout << j_umap << '\\n';\n    std::cout << j_mmap << '\\n';\n    std::cout << j_ummap << \"\\n\\n\";\n\n    // ===========\n    // array types\n    // ===========\n\n    // create an array from an array_t value\n    json::array_t array_value = {\"one\", \"two\", 3, 4.5, false};\n    json j_array_t(array_value);\n\n    // create an array from std::vector\n    std::vector<int> c_vector {1, 2, 3, 4};\n    json j_vec(c_vector);\n\n    // create an array from std::valarray\n    std::valarray<short> c_valarray {10, 9, 8, 7};\n    json j_valarray(c_valarray);\n\n    // create an array from std::deque\n    std::deque<double> c_deque {1.2, 2.3, 3.4, 5.6};\n    json j_deque(c_deque);\n\n    // create an array from std::list\n    std::list<bool> c_list {true, true, false, true};\n    json j_list(c_list);\n\n    // create an array from std::forward_list\n    std::forward_list<std::int64_t> c_flist {12345678909876, 23456789098765, 34567890987654, 45678909876543};\n    json j_flist(c_flist);\n\n    // create an array from std::array\n    std::array<unsigned long, 4> c_array {{1, 2, 3, 4}};\n    json j_array(c_array);\n\n    // create an array from std::set\n    std::set<std::string> c_set {\"one\", \"two\", \"three\", \"four\", \"one\"};\n    json j_set(c_set); // only one entry for \"one\" is used\n\n    // create an array from std::unordered_set\n    std::unordered_set<std::string> c_uset {\"one\", \"two\", \"three\", \"four\", \"one\"};\n    json j_uset(c_uset); // only one entry for \"one\" is used\n\n    // create an array from std::multiset\n    std::multiset<std::string> c_mset {\"one\", \"two\", \"one\", \"four\"};\n    json j_mset(c_mset); // both entries for \"one\" are used\n\n    // create an array from std::unordered_multiset\n    std::unordered_multiset<std::string> c_umset {\"one\", \"two\", \"one\", \"four\"};\n    json j_umset(c_umset); // both entries for \"one\" are used\n\n    // serialize the JSON arrays\n    std::cout << j_array_t << '\\n';\n    std::cout << j_vec << '\\n';\n    std::cout << j_valarray << '\\n';\n    std::cout << j_deque << '\\n';\n    std::cout << j_list << '\\n';\n    std::cout << j_flist << '\\n';\n    std::cout << j_array << '\\n';\n    std::cout << j_set << '\\n';\n    std::cout << j_uset << '\\n';\n    std::cout << j_mset << '\\n';\n    std::cout << j_umset << \"\\n\\n\";\n\n    // ============\n    // string types\n    // ============\n\n    // create string from a string_t value\n    json::string_t string_value = \"The quick brown fox jumps over the lazy dog.\";\n    json j_string_t(string_value);\n\n    // create a JSON string directly from a string literal\n    json j_string_literal(\"The quick brown fox jumps over the lazy dog.\");\n\n    // create string from std::string\n    std::string s_stdstring = \"The quick brown fox jumps over the lazy dog.\";\n    json j_stdstring(s_stdstring);\n\n    // serialize the JSON strings\n    std::cout << j_string_t << '\\n';\n    std::cout << j_string_literal << '\\n';\n    std::cout << j_stdstring << \"\\n\\n\";\n\n    // ============\n    // number types\n    // ============\n\n    // create a JSON number from number_integer_t\n    json::number_integer_t value_integer_t = -42;\n    json j_integer_t(value_integer_t);\n\n    // create a JSON number from number_unsigned_t\n    json::number_integer_t value_unsigned_t = 17;\n    json j_unsigned_t(value_unsigned_t);\n\n    // create a JSON number from an anonymous enum\n    enum { enum_value = 17 };\n    json j_enum(enum_value);\n\n    // create values of different integer types\n    short n_short = 42;\n    int n_int = -23;\n    long n_long = 1024;\n    int_least32_t n_int_least32_t = -17;\n    uint8_t n_uint8_t = 8;\n\n    // create (integer) JSON numbers\n    json j_short(n_short);\n    json j_int(n_int);\n    json j_long(n_long);\n    json j_int_least32_t(n_int_least32_t);\n    json j_uint8_t(n_uint8_t);\n\n    // create values of different floating-point types\n    json::number_float_t v_ok = 3.141592653589793;\n    json::number_float_t v_nan = NAN;\n    json::number_float_t v_infinity = INFINITY;\n\n    // create values of different floating-point types\n    float n_float = 42.23;\n    float n_float_nan = 1.0f / 0.0f;\n    double n_double = 23.42;\n\n    // create (floating point) JSON numbers\n    json j_ok(v_ok);\n    json j_nan(v_nan);\n    json j_infinity(v_infinity);\n    json j_float(n_float);\n    json j_float_nan(n_float_nan);\n    json j_double(n_double);\n\n    // serialize the JSON numbers\n    std::cout << j_integer_t << '\\n';\n    std::cout << j_unsigned_t << '\\n';\n    std::cout << j_enum << '\\n';\n    std::cout << j_short << '\\n';\n    std::cout << j_int << '\\n';\n    std::cout << j_long << '\\n';\n    std::cout << j_int_least32_t << '\\n';\n    std::cout << j_uint8_t << '\\n';\n    std::cout << j_ok << '\\n';\n    std::cout << j_nan << '\\n';\n    std::cout << j_infinity << '\\n';\n    std::cout << j_float << '\\n';\n    std::cout << j_float_nan << '\\n';\n    std::cout << j_double << \"\\n\\n\";\n\n    // =============\n    // boolean types\n    // =============\n\n    // create boolean values\n    json j_truth = true;\n    json j_falsity = false;\n\n    // serialize the JSON booleans\n    std::cout << j_truth << '\\n';\n    std::cout << j_falsity << '\\n';\n}\n

    Output:

    {\"one\":1,\"two\":2}\n{\"one\":1,\"three\":3,\"two\":2}\n{\"one\":1.2,\"three\":3.4,\"two\":2.3}\n{\"one\":true,\"three\":false,\"two\":true}\n{\"one\":true,\"three\":false,\"two\":true}\n\n[\"one\",\"two\",3,4.5,false]\n[1,2,3,4]\n[10,9,8,7]\n[1.2,2.3,3.4,5.6]\n[true,true,false,true]\n[12345678909876,23456789098765,34567890987654,45678909876543]\n[1,2,3,4]\n[\"four\",\"one\",\"three\",\"two\"]\n[\"four\",\"three\",\"two\",\"one\"]\n[\"four\",\"one\",\"one\",\"two\"]\n[\"four\",\"two\",\"one\",\"one\"]\n\n\"The quick brown fox jumps over the lazy dog.\"\n\"The quick brown fox jumps over the lazy dog.\"\n\"The quick brown fox jumps over the lazy dog.\"\n\n-42\n17\n17\n42\n-23\n1024\n-17\n8\n3.141592653589793\nnull\nnull\n42.22999954223633\nnull\n23.42\n\ntrue\nfalse\n

    Note the output is platform-dependent.

    Example: (5) create a container (array or object) from an initializer list

    The example below shows how JSON values are created from initializer lists.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // create JSON values\n    json j_empty_init_list = json({});\n    json j_object = { {\"one\", 1}, {\"two\", 2} };\n    json j_array = {1, 2, 3, 4};\n    json j_nested_object = { {\"one\", {1}}, {\"two\", {1, 2}} };\n    json j_nested_array = { {{1}, \"one\"}, {{1, 2}, \"two\"} };\n\n    // serialize the JSON value\n    std::cout << j_empty_init_list << '\\n';\n    std::cout << j_object << '\\n';\n    std::cout << j_array << '\\n';\n    std::cout << j_nested_object << '\\n';\n    std::cout << j_nested_array << '\\n';\n}\n

    Output:

    {}\n{\"one\":1,\"two\":2}\n[1,2,3,4]\n{\"one\":[1],\"two\":[1,2]}\n[[[1],\"one\"],[[1,2],\"two\"]]\n
    Example: (6) construct an array with count copies of a given value

    The following code shows examples for creating arrays with several copies of a given value.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // create an array by creating copies of a JSON value\n    json value = \"Hello\";\n    json array_0 = json(0, value);\n    json array_1 = json(1, value);\n    json array_5 = json(5, value);\n\n    // serialize the JSON arrays\n    std::cout << array_0 << '\\n';\n    std::cout << array_1 << '\\n';\n    std::cout << array_5 << '\\n';\n}\n

    Output:

    []\n[\"Hello\"]\n[\"Hello\",\"Hello\",\"Hello\",\"Hello\",\"Hello\"]\n
    Example: (7) construct a JSON container given an iterator range

    The example below shows several ways to create JSON values by specifying a subrange with iterators.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // create JSON values\n    json j_array = {\"alpha\", \"bravo\", \"charly\", \"delta\", \"easy\"};\n    json j_number = 42;\n    json j_object = {{\"one\", \"eins\"}, {\"two\", \"zwei\"}};\n\n    // create copies using iterators\n    json j_array_range(j_array.begin() + 1, j_array.end() - 2);\n    json j_number_range(j_number.begin(), j_number.end());\n    json j_object_range(j_object.begin(), j_object.find(\"two\"));\n\n    // serialize the values\n    std::cout << j_array_range << '\\n';\n    std::cout << j_number_range << '\\n';\n    std::cout << j_object_range << '\\n';\n\n    // example for an exception\n    try\n    {\n        json j_invalid(j_number.begin() + 1, j_number.end());\n    }\n    catch (const json::invalid_iterator& e)\n    {\n        std::cout << e.what() << '\\n';\n    }\n}\n

    Output:

    [\"bravo\",\"charly\"]\n42\n{\"one\":\"eins\"}\n[json.exception.invalid_iterator.204] iterators out of range\n
    Example: (8) copy constructor

    The following code shows an example for the copy constructor.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // create a JSON array\n    json j1 = {\"one\", \"two\", 3, 4.5, false};\n\n    // create a copy\n    json j2(j1);\n\n    // serialize the JSON array\n    std::cout << j1 << \" = \" << j2 << '\\n';\n    std::cout << std::boolalpha << (j1 == j2) << '\\n';\n}\n

    Output:

    [\"one\",\"two\",3,4.5,false] = [\"one\",\"two\",3,4.5,false]\ntrue\n
    Example: (9) move constructor

    The code below shows the move constructor explicitly called via std::move.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // create a JSON value\n    json a = 23;\n\n    // move contents of a to b\n    json b(std::move(a));\n\n    // serialize the JSON arrays\n    std::cout << a << '\\n';\n    std::cout << b << '\\n';\n}\n

    Output:

    null\n23\n
    "},{"location":"api/basic_json/basic_json/#version-history","title":"Version history","text":"
    1. Since version 1.0.0.
    2. Since version 1.0.0.
    3. Since version 2.1.0.
    4. Since version 3.2.0.
    5. Since version 1.0.0.
    6. Since version 1.0.0.
    7. Since version 1.0.0.
    8. Since version 1.0.0.
    9. Since version 1.0.0.
    "},{"location":"api/basic_json/begin/","title":"nlohmann::basic_json::begin","text":"
    iterator begin() noexcept;\nconst_iterator begin() const noexcept;\n

    Returns an iterator to the first element.

    "},{"location":"api/basic_json/begin/#return-value","title":"Return value","text":"

    iterator to the first element

    "},{"location":"api/basic_json/begin/#exception-safety","title":"Exception safety","text":"

    No-throw guarantee: this member function never throws exceptions.

    "},{"location":"api/basic_json/begin/#complexity","title":"Complexity","text":"

    Constant.

    "},{"location":"api/basic_json/begin/#examples","title":"Examples","text":"Example

    The following code shows an example for begin().

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // create an array value\n    json array = {1, 2, 3, 4, 5};\n\n    // get an iterator to the first element\n    json::iterator it = array.begin();\n\n    // serialize the element that the iterator points to\n    std::cout << *it << '\\n';\n}\n

    Output:

    1\n
    "},{"location":"api/basic_json/begin/#version-history","title":"Version history","text":"
    • Added in version 1.0.0.
    "},{"location":"api/basic_json/binary/","title":"nlohmann::basic_json::binary","text":"
    // (1)\nstatic basic_json binary(const typename binary_t::container_type& init);\nstatic basic_json binary(typename binary_t::container_type&& init);\n\n// (2)\nstatic basic_json binary(const typename binary_t::container_type& init,\n                         std::uint8_t subtype);\nstatic basic_json binary(typename binary_t::container_type&& init,\n                         std::uint8_t subtype);\n
    1. Creates a JSON binary array value from a given binary container.
    2. Creates a JSON binary array value from a given binary container with subtype.

    Binary values are part of various binary formats, such as CBOR, MessagePack, and BSON. This constructor is used to create a value for serialization to those formats.

    "},{"location":"api/basic_json/binary/#parameters","title":"Parameters","text":"init (in) container containing bytes to use as a binary type subtype (in) subtype to use in CBOR, MessagePack, and BSON"},{"location":"api/basic_json/binary/#return-value","title":"Return value","text":"

    JSON binary array value

    "},{"location":"api/basic_json/binary/#exception-safety","title":"Exception safety","text":"

    Strong guarantee: if an exception is thrown, there are no changes in the JSON value.

    "},{"location":"api/basic_json/binary/#complexity","title":"Complexity","text":"

    Linear in the size of init; constant for typename binary_t::container_type&& init versions.

    "},{"location":"api/basic_json/binary/#notes","title":"Notes","text":"

    Note, this function exists because of the difficulty in correctly specifying the correct template overload in the standard value ctor, as both JSON arrays and JSON binary arrays are backed with some form of a std::vector. Because JSON binary arrays are a non-standard extension, it was decided that it would be best to prevent automatic initialization of a binary array type, for backwards compatibility and so it does not happen on accident.

    "},{"location":"api/basic_json/binary/#examples","title":"Examples","text":"Example

    The following code shows how to create a binary value.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // create a binary vector\n    std::vector<std::uint8_t> vec = {0xCA, 0xFE, 0xBA, 0xBE};\n\n    // create a binary JSON value with subtype 42\n    json j = json::binary(vec, 42);\n\n    // output type and subtype\n    std::cout << \"type: \" << j.type_name() << \", subtype: \" << j.get_binary().subtype() << std::endl;\n}\n

    Output:

    type: binary, subtype: 42\n
    "},{"location":"api/basic_json/binary/#version-history","title":"Version history","text":"
    • Added in version 3.8.0.
    "},{"location":"api/basic_json/binary_t/","title":"nlohmann::basic_json::binary_t","text":"
    using binary_t = byte_container_with_subtype<BinaryType>;\n

    This type is a type designed to carry binary data that appears in various serialized formats, such as CBOR's Major Type 2, MessagePack's bin, and BSON's generic binary subtype. This type is NOT a part of standard JSON and exists solely for compatibility with these binary types. As such, it is simply defined as an ordered sequence of zero or more byte values.

    Additionally, as an implementation detail, the subtype of the binary data is carried around as a std::uint64_t, which is compatible with both of the binary data formats that use binary subtyping, (though the specific numbering is incompatible with each other, and it is up to the user to translate between them). The subtype is added to BinaryType via the helper type byte_container_with_subtype.

    CBOR's RFC 7049 describes this type as:

    Major type 2: a byte string. The string's length in bytes is represented following the rules for positive integers (major type 0).

    MessagePack's documentation on the bin type family describes this type as:

    Bin format family stores a byte array in 2, 3, or 5 bytes of extra bytes in addition to the size of the byte array.

    BSON's specifications describe several binary types; however, this type is intended to represent the generic binary type which has the description:

    Generic binary subtype - This is the most commonly used binary subtype and should be the 'default' for drivers and tools.

    None of these impose any limitations on the internal representation other than the basic unit of storage be some type of array whose parts are decomposable into bytes.

    The default representation of this binary format is a std::vector<std::uint8_t>, which is a very common way to represent a byte array in modern C++.

    "},{"location":"api/basic_json/binary_t/#template-parameters","title":"Template parameters","text":"BinaryType container type to store arrays"},{"location":"api/basic_json/binary_t/#notes","title":"Notes","text":""},{"location":"api/basic_json/binary_t/#default-type","title":"Default type","text":"

    The default values for BinaryType is std::vector<std::uint8_t>.

    "},{"location":"api/basic_json/binary_t/#storage","title":"Storage","text":"

    Binary Arrays are stored as pointers in a basic_json type. That is, for any access to array values, a pointer of the type binary_t* must be dereferenced.

    "},{"location":"api/basic_json/binary_t/#notes-on-subtypes","title":"Notes on subtypes","text":"

    • CBOR

      • Binary values are represented as byte strings. Subtypes are written as tags.

    • MessagePack

      • If a subtype is given and the binary array contains exactly 1, 2, 4, 8, or 16 elements, the fixext family (fixext1, fixext2, fixext4, fixext8) is used. For other sizes, the ext family (ext8, ext16, ext32) is used. The subtype is then added as a signed 8-bit integer.
      • If no subtype is given, the bin family (bin8, bin16, bin32) is used.

    • BSON

      • If a subtype is given, it is used and added as an unsigned 8-bit integer.
      • If no subtype is given, the generic binary subtype 0x00 is used.
    "},{"location":"api/basic_json/binary_t/#examples","title":"Examples","text":"Example

    The following code shows that binary_t is by default, a typedef to nlohmann::byte_container_with_subtype<std::vector<std::uint8_t>>.

    #include <iostream>\n#include <iomanip>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    std::cout << std::boolalpha << std::is_same<nlohmann::byte_container_with_subtype<std::vector<std::uint8_t>>, json::binary_t>::value << std::endl;\n}\n

    Output:

    true\n
    "},{"location":"api/basic_json/binary_t/#see-also","title":"See also","text":"
    • byte_container_with_subtype
    "},{"location":"api/basic_json/binary_t/#version-history","title":"Version history","text":"
    • Added in version 3.8.0. Changed the type of subtype to std::uint64_t in version 3.10.0.
    "},{"location":"api/basic_json/boolean_t/","title":"nlohmann::basic_json::boolean_t","text":"
    using boolean_t = BooleanType;\n

    The type used to store JSON booleans.

    RFC 8259 implicitly describes a boolean as a type which differentiates the two literals true and false.

    To store objects in C++, a type is defined by the template parameter BooleanType which chooses the type to use.

    "},{"location":"api/basic_json/boolean_t/#notes","title":"Notes","text":""},{"location":"api/basic_json/boolean_t/#default-type","title":"Default type","text":"

    With the default values for BooleanType (bool), the default value for boolean_t is bool.

    "},{"location":"api/basic_json/boolean_t/#storage","title":"Storage","text":"

    Boolean values are stored directly inside a basic_json type.

    "},{"location":"api/basic_json/boolean_t/#examples","title":"Examples","text":"Example

    The following code shows that boolean_t is by default, a typedef to bool.

    #include <iostream>\n#include <iomanip>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    std::cout << std::boolalpha << std::is_same<bool, json::boolean_t>::value << std::endl;\n}\n

    Output:

    true\n
    "},{"location":"api/basic_json/boolean_t/#version-history","title":"Version history","text":"
    • Added in version 1.0.0.
    "},{"location":"api/basic_json/cbegin/","title":"nlohmann::basic_json::cbegin","text":"
    const_iterator cbegin() const noexcept;\n

    Returns an iterator to the first element.

    "},{"location":"api/basic_json/cbegin/#return-value","title":"Return value","text":"

    iterator to the first element

    "},{"location":"api/basic_json/cbegin/#exception-safety","title":"Exception safety","text":"

    No-throw guarantee: this member function never throws exceptions.

    "},{"location":"api/basic_json/cbegin/#complexity","title":"Complexity","text":"

    Constant.

    "},{"location":"api/basic_json/cbegin/#examples","title":"Examples","text":"Example

    The following code shows an example for cbegin().

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // create an array value\n    const json array = {1, 2, 3, 4, 5};\n\n    // get an iterator to the first element\n    json::const_iterator it = array.cbegin();\n\n    // serialize the element that the iterator points to\n    std::cout << *it << '\\n';\n}\n

    Output:

    1\n
    "},{"location":"api/basic_json/cbegin/#version-history","title":"Version history","text":"
    • Added in version 1.0.0.
    "},{"location":"api/basic_json/cbor_tag_handler_t/","title":"nlohmann::basic_json::cbor_tag_handler_t","text":"
    enum class cbor_tag_handler_t\n{\n    error,\n    ignore,\n    store\n};\n

    This enumeration is used in the from_cbor function to choose how to treat tags:

    error throw a parse_error exception in case of a tag ignore ignore tags store store tagged values as binary container with subtype (for bytes 0xd8..0xdb)"},{"location":"api/basic_json/cbor_tag_handler_t/#examples","title":"Examples","text":"Example

    The example below shows how the different values of the cbor_tag_handler_t influence the behavior of from_cbor when reading a tagged byte string.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // tagged byte string\n    std::vector<std::uint8_t> vec = {{0xd8, 0x42, 0x44, 0xcA, 0xfe, 0xba, 0xbe}};\n\n    // cbor_tag_handler_t::error throws\n    try\n    {\n        auto b_throw_on_tag = json::from_cbor(vec, true, true, json::cbor_tag_handler_t::error);\n    }\n    catch (const json::parse_error& e)\n    {\n        std::cout << e.what() << std::endl;\n    }\n\n    // cbor_tag_handler_t::ignore ignores the tag\n    auto b_ignore_tag = json::from_cbor(vec, true, true, json::cbor_tag_handler_t::ignore);\n    std::cout << b_ignore_tag << std::endl;\n\n    // cbor_tag_handler_t::store stores the tag as binary subtype\n    auto b_store_tag = json::from_cbor(vec, true, true, json::cbor_tag_handler_t::store);\n    std::cout << b_store_tag << std::endl;\n}\n

    Output:

    [json.exception.parse_error.112] parse error at byte 1: syntax error while parsing CBOR value: invalid byte: 0xD8\n{\"bytes\":[202,254,186,190],\"subtype\":null}\n{\"bytes\":[202,254,186,190],\"subtype\":66}\n
    "},{"location":"api/basic_json/cbor_tag_handler_t/#version-history","title":"Version history","text":"
    • Added in version 3.9.0. Added value store in 3.10.0.
    "},{"location":"api/basic_json/cend/","title":"nlohmann::basic_json::cend","text":"
    const_iterator cend() const noexcept;\n

    Returns an iterator to one past the last element.

    "},{"location":"api/basic_json/cend/#return-value","title":"Return value","text":"

    iterator one past the last element

    "},{"location":"api/basic_json/cend/#exception-safety","title":"Exception safety","text":"

    No-throw guarantee: this member function never throws exceptions.

    "},{"location":"api/basic_json/cend/#complexity","title":"Complexity","text":"

    Constant.

    "},{"location":"api/basic_json/cend/#examples","title":"Examples","text":"Example

    The following code shows an example for cend().

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // create an array value\n    json array = {1, 2, 3, 4, 5};\n\n    // get an iterator to one past the last element\n    json::const_iterator it = array.cend();\n\n    // decrement the iterator to point to the last element\n    --it;\n\n    // serialize the element that the iterator points to\n    std::cout << *it << '\\n';\n}\n

    Output:

    5\n
    "},{"location":"api/basic_json/cend/#version-history","title":"Version history","text":"
    • Added in version 1.0.0.
    "},{"location":"api/basic_json/clear/","title":"nlohmann::basic_json::clear","text":"
    void clear() noexcept;\n

    Clears the content of a JSON value and resets it to the default value as if basic_json(value_t) would have been called with the current value type from type():

    Value type initial value null null boolean false string \"\" number 0 binary An empty byte vector object {} array []

    Has the same effect as calling

    *this = basic_json(type());\n
    "},{"location":"api/basic_json/clear/#exception-safety","title":"Exception safety","text":"

    No-throw guarantee: this function never throws exceptions.

    "},{"location":"api/basic_json/clear/#complexity","title":"Complexity","text":"

    Linear in the size of the JSON value.

    "},{"location":"api/basic_json/clear/#notes","title":"Notes","text":"

    All iterators, pointers, and references related to this container are invalidated.

    "},{"location":"api/basic_json/clear/#examples","title":"Examples","text":"Example

    The example below shows the effect of clear() to different JSON types.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // create JSON values\n    json j_null;\n    json j_boolean = true;\n    json j_number_integer = 17;\n    json j_number_float = 23.42;\n    json j_object = {{\"one\", 1}, {\"two\", 2}};\n    json j_array = {1, 2, 4, 8, 16};\n    json j_string = \"Hello, world\";\n\n    // call clear()\n    j_null.clear();\n    j_boolean.clear();\n    j_number_integer.clear();\n    j_number_float.clear();\n    j_object.clear();\n    j_array.clear();\n    j_string.clear();\n\n    // serialize the cleared values()\n    std::cout << j_null << '\\n';\n    std::cout << j_boolean << '\\n';\n    std::cout << j_number_integer << '\\n';\n    std::cout << j_number_float << '\\n';\n    std::cout << j_object << '\\n';\n    std::cout << j_array << '\\n';\n    std::cout << j_string << '\\n';\n}\n

    Output:

    null\nfalse\n0\n0.0\n{}\n[]\n\"\"\n
    "},{"location":"api/basic_json/clear/#version-history","title":"Version history","text":"
    • Added in version 1.0.0.
    • Added support for binary types in version 3.8.0.
    "},{"location":"api/basic_json/contains/","title":"nlohmann::basic_json::contains","text":"
    // (1)\nbool contains(const typename object_t::key_type& key) const;\n\n// (2)\ntemplate<typename KeyType>\nbool contains(KeyType&& key) const;\n\n// (3)\nbool contains(const json_pointer& ptr) const;\n
    1. Check whether an element exists in a JSON object with a key equivalent to key. If the element is not found or the JSON value is not an object, false is returned.
    2. See 1. This overload is only available if KeyType is comparable with typename object_t::key_type and typename object_comparator_t::is_transparent denotes a type.
    3. Check whether the given JSON pointer ptr can be resolved in the current JSON value.
    "},{"location":"api/basic_json/contains/#template-parameters","title":"Template parameters","text":"KeyType A type for an object key other than json_pointer that is comparable with string_t using object_comparator_t. This can also be a string view (C++17)."},{"location":"api/basic_json/contains/#parameters","title":"Parameters","text":"key (in) key value to check its existence. ptr (in) JSON pointer to check its existence."},{"location":"api/basic_json/contains/#return-value","title":"Return value","text":"
    1. true if an element with specified key exists. If no such element with such a key is found or the JSON value is not an object, false is returned.
    2. See 1.
    3. true if the JSON pointer can be resolved to a stored value, false otherwise.
    "},{"location":"api/basic_json/contains/#exception-safety","title":"Exception safety","text":"

    Strong exception safety: if an exception occurs, the original value stays intact.

    "},{"location":"api/basic_json/contains/#exceptions","title":"Exceptions","text":"
    1. The function does not throw exceptions.
    2. The function does not throw exceptions.
    3. The function can throw the following exceptions:
      • Throws parse_error.106 if an array index begins with 0.
      • Throws parse_error.109 if an array index was not a number.
    "},{"location":"api/basic_json/contains/#complexity","title":"Complexity","text":"

    Logarithmic in the size of the JSON object.

    "},{"location":"api/basic_json/contains/#notes","title":"Notes","text":"
    • This method always returns false when executed on a JSON type that is not an object.
    • This method can be executed on any JSON value type.

    Postconditions

    If j.contains(x) returns true for a key or JSON pointer x, then it is safe to call j[x].

    "},{"location":"api/basic_json/contains/#examples","title":"Examples","text":"Example: (1) check with key

    The example shows how contains() is used.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\nusing namespace nlohmann::literals;\n\nint main()\n{\n    // create some JSON values\n    json j_object = R\"( {\"key\": \"value\"} )\"_json;\n    json j_array = R\"( [1, 2, 3] )\"_json;\n\n    // call contains\n    std::cout << std::boolalpha <<\n              \"j_object contains 'key': \" << j_object.contains(\"key\") << '\\n' <<\n              \"j_object contains 'another': \" << j_object.contains(\"another\") << '\\n' <<\n              \"j_array contains 'key': \" << j_array.contains(\"key\") << std::endl;\n}\n

    Output:

    j_object contains 'key': true\nj_object contains 'another': false\nj_array contains 'key': false\n
    Example: (2) check with key using string_view

    The example shows how contains() is used.

    #include <iostream>\n#include <string_view>\n#include <nlohmann/json.hpp>\n\nusing namespace std::string_view_literals;\nusing json = nlohmann::json;\nusing namespace nlohmann::literals;\n\nint main()\n{\n    // create some JSON values\n    json j_object = R\"( {\"key\": \"value\"} )\"_json;\n    json j_array = R\"( [1, 2, 3] )\"_json;\n\n    // call contains\n    std::cout << std::boolalpha <<\n              \"j_object contains 'key': \" << j_object.contains(\"key\"sv) << '\\n' <<\n              \"j_object contains 'another': \" << j_object.contains(\"another\"sv) << '\\n' <<\n              \"j_array contains 'key': \" << j_array.contains(\"key\"sv) << std::endl;\n}\n

    Output:

    j_object contains 'key': true\nj_object contains 'another': false\nj_array contains 'key': false\n
    Example: (3) check with JSON pointer

    The example shows how contains() is used.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\nusing namespace nlohmann::literals;\n\nint main()\n{\n    // create a JSON value\n    json j =\n    {\n        {\"number\", 1}, {\"string\", \"foo\"}, {\"array\", {1, 2}}\n    };\n\n    std::cout << std::boolalpha\n              << j.contains(\"/number\"_json_pointer) << '\\n'\n              << j.contains(\"/string\"_json_pointer) << '\\n'\n              << j.contains(\"/array\"_json_pointer) << '\\n'\n              << j.contains(\"/array/1\"_json_pointer) << '\\n'\n              << j.contains(\"/array/-\"_json_pointer) << '\\n'\n              << j.contains(\"/array/4\"_json_pointer) << '\\n'\n              << j.contains(\"/baz\"_json_pointer) << std::endl;\n\n    try\n    {\n        // try to use an array index with leading '0'\n        j.contains(\"/array/01\"_json_pointer);\n    }\n    catch (const json::parse_error& e)\n    {\n        std::cout << e.what() << '\\n';\n    }\n\n    try\n    {\n        // try to use an array index that is not a number\n        j.contains(\"/array/one\"_json_pointer);\n    }\n    catch (const json::parse_error& e)\n    {\n        std::cout << e.what() << '\\n';\n    }\n}\n

    Output:

    true\ntrue\ntrue\ntrue\nfalse\nfalse\nfalse\n
    "},{"location":"api/basic_json/contains/#version-history","title":"Version history","text":"
    1. Added in version 3.11.0.
    2. Added in version 3.6.0. Extended template KeyType to support comparable types in version 3.11.0.
    3. Added in version 3.7.0.
    "},{"location":"api/basic_json/count/","title":"nlohmann::basic_json::count","text":"
    // (1)\nsize_type count(const typename object_t::key_type& key) const;\n\n// (2)\ntemplate<typename KeyType>\nsize_type count(KeyType&& key) const;\n
    1. Returns the number of elements with key key. If ObjectType is the default std::map type, the return value will always be 0 (key was not found) or 1 (key was found).
    2. See 1. This overload is only available if KeyType is comparable with typename object_t::key_type and typename object_comparator_t::is_transparent denotes a type.
    "},{"location":"api/basic_json/count/#template-parameters","title":"Template parameters","text":"KeyType A type for an object key other than json_pointer that is comparable with string_t using object_comparator_t. This can also be a string view (C++17)."},{"location":"api/basic_json/count/#parameters","title":"Parameters","text":"key (in) key value of the element to count."},{"location":"api/basic_json/count/#return-value","title":"Return value","text":"

    Number of elements with key key. If the JSON value is not an object, the return value will be 0.

    "},{"location":"api/basic_json/count/#exception-safety","title":"Exception safety","text":"

    Strong exception safety: if an exception occurs, the original value stays intact.

    "},{"location":"api/basic_json/count/#complexity","title":"Complexity","text":"

    Logarithmic in the size of the JSON object.

    "},{"location":"api/basic_json/count/#notes","title":"Notes","text":"

    This method always returns 0 when executed on a JSON type that is not an object.

    "},{"location":"api/basic_json/count/#examples","title":"Examples","text":"Example: (1) count number of elements

    The example shows how count() is used.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // create a JSON object\n    json j_object = {{\"one\", 1}, {\"two\", 2}};\n\n    // call count()\n    auto count_two = j_object.count(\"two\");\n    auto count_three = j_object.count(\"three\");\n\n    // print values\n    std::cout << \"number of elements with key \\\"two\\\": \" << count_two << '\\n';\n    std::cout << \"number of elements with key \\\"three\\\": \" << count_three << '\\n';\n}\n

    Output:

    number of elements with key \"two\": 1\nnumber of elements with key \"three\": 0\n
    Example: (2) count number of elements using string_view

    The example shows how count() is used.

    #include <iostream>\n#include <string_view>\n#include <nlohmann/json.hpp>\n\nusing namespace std::string_view_literals;\nusing json = nlohmann::json;\n\nint main()\n{\n    // create a JSON object\n    json j_object = {{\"one\", 1}, {\"two\", 2}};\n\n    // call count()\n    auto count_two = j_object.count(\"two\"sv);\n    auto count_three = j_object.count(\"three\"sv);\n\n    // print values\n    std::cout << \"number of elements with key \\\"two\\\": \" << count_two << '\\n';\n    std::cout << \"number of elements with key \\\"three\\\": \" << count_three << '\\n';\n}\n

    Output:

    number of elements with key \"two\": 1\nnumber of elements with key \"three\": 0\n
    "},{"location":"api/basic_json/count/#version-history","title":"Version history","text":"
    1. Added in version 3.11.0.
    2. Added in version 1.0.0. Changed parameter key type to KeyType&& in version 3.11.0.
    "},{"location":"api/basic_json/crbegin/","title":"nlohmann::basic_json::crbegin","text":"
    const_reverse_iterator crbegin() const noexcept;\n

    Returns an iterator to the reverse-beginning; that is, the last element.

    "},{"location":"api/basic_json/crbegin/#return-value","title":"Return value","text":"

    reverse iterator to the first element

    "},{"location":"api/basic_json/crbegin/#exception-safety","title":"Exception safety","text":"

    No-throw guarantee: this member function never throws exceptions.

    "},{"location":"api/basic_json/crbegin/#complexity","title":"Complexity","text":"

    Constant.

    "},{"location":"api/basic_json/crbegin/#examples","title":"Examples","text":"Example

    The following code shows an example for crbegin().

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // create an array value\n    json array = {1, 2, 3, 4, 5};\n\n    // get an iterator to the reverse-beginning\n    json::const_reverse_iterator it = array.crbegin();\n\n    // serialize the element that the iterator points to\n    std::cout << *it << '\\n';\n}\n

    Output:

    5\n
    "},{"location":"api/basic_json/crbegin/#version-history","title":"Version history","text":"
    • Added in version 1.0.0.
    "},{"location":"api/basic_json/crend/","title":"nlohmann::basic_json::crend","text":"
    const_reverse_iterator crend() const noexcept;\n

    Returns an iterator to the reverse-end; that is, one before the first element. This element acts as a placeholder, attempting to access it results in undefined behavior.

    "},{"location":"api/basic_json/crend/#return-value","title":"Return value","text":"

    reverse iterator to the element following the last element

    "},{"location":"api/basic_json/crend/#exception-safety","title":"Exception safety","text":"

    No-throw guarantee: this member function never throws exceptions.

    "},{"location":"api/basic_json/crend/#complexity","title":"Complexity","text":"

    Constant.

    "},{"location":"api/basic_json/crend/#examples","title":"Examples","text":"Example

    The following code shows an example for eend().

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // create an array value\n    json array = {1, 2, 3, 4, 5};\n\n    // get an iterator to the reverse-end\n    json::const_reverse_iterator it = array.crend();\n\n    // increment the iterator to point to the first element\n    --it;\n\n    // serialize the element that the iterator points to\n    std::cout << *it << '\\n';\n}\n

    Output:

    1\n
    "},{"location":"api/basic_json/crend/#version-history","title":"Version history","text":"
    • Added in version 1.0.0.
    "},{"location":"api/basic_json/default_object_comparator_t/","title":"nlohmann::basic_json::default_object_comparator_t","text":"
    using default_object_comparator_t = std::less<StringType>;  // until C++14\n\nusing default_object_comparator_t = std::less<>;            // since C++14\n

    The default comparator used by object_t.

    Since C++14 a transparent comparator is used which prevents unnecessary string construction when looking up a key in an object.

    The actual comparator used depends on object_t and can be obtained via object_comparator_t.

    "},{"location":"api/basic_json/default_object_comparator_t/#examples","title":"Examples","text":"Example

    The example below demonstrates the default comparator.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    std::cout << std::boolalpha\n              << \"one < two : \" << json::default_object_comparator_t{}(\"one\", \"two\") << \"\\n\"\n              << \"three < four : \" << json::default_object_comparator_t{}(\"three\", \"four\") << std::endl;\n}\n

    Output:

    one < two : true\nthree < four : false\n
    "},{"location":"api/basic_json/default_object_comparator_t/#version-history","title":"Version history","text":"
    • Added in version 3.11.0.
    "},{"location":"api/basic_json/diff/","title":"nlohmann::basic_json::diff","text":"
    static basic_json diff(const basic_json& source,\n                       const basic_json& target);\n

    Creates a JSON Patch so that value source can be changed into the value target by calling patch function.

    For two JSON values source and target, the following code yields always true: 

    source.patch(diff(source, target)) == target;\n

    "},{"location":"api/basic_json/diff/#parameters","title":"Parameters","text":"source (in) JSON value to compare from target (in) JSON value to compare against"},{"location":"api/basic_json/diff/#return-value","title":"Return value","text":"

    a JSON patch to convert the source to target

    "},{"location":"api/basic_json/diff/#exception-safety","title":"Exception safety","text":"

    Strong guarantee: if an exception is thrown, there are no changes in the JSON value.

    "},{"location":"api/basic_json/diff/#complexity","title":"Complexity","text":"

    Linear in the lengths of source and target.

    "},{"location":"api/basic_json/diff/#notes","title":"Notes","text":"

    Currently, only remove, add, and replace operations are generated.

    "},{"location":"api/basic_json/diff/#examples","title":"Examples","text":"Example

    The following code shows how a JSON patch is created as a diff for two JSON values.

    #include <iostream>\n#include <iomanip>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\nusing namespace nlohmann::literals;\n\nint main()\n{\n    // the source document\n    json source = R\"(\n        {\n            \"baz\": \"qux\",\n            \"foo\": \"bar\"\n        }\n    )\"_json;\n\n    // the target document\n    json target = R\"(\n        {\n            \"baz\": \"boo\",\n            \"hello\": [\n                \"world\"\n            ]\n        }\n    )\"_json;\n\n    // create the patch\n    json patch = json::diff(source, target);\n\n    // roundtrip\n    json patched_source = source.patch(patch);\n\n    // output patch and roundtrip result\n    std::cout << std::setw(4) << patch << \"\\n\\n\"\n              << std::setw(4) << patched_source << std::endl;\n}\n

    Output:

    [\n    {\n        \"op\": \"replace\",\n        \"path\": \"/baz\",\n        \"value\": \"boo\"\n    },\n    {\n        \"op\": \"remove\",\n        \"path\": \"/foo\"\n    },\n    {\n        \"op\": \"add\",\n        \"path\": \"/hello\",\n        \"value\": [\n            \"world\"\n        ]\n    }\n]\n\n{\n    \"baz\": \"boo\",\n    \"hello\": [\n        \"world\"\n    ]\n}\n
    "},{"location":"api/basic_json/diff/#see-also","title":"See also","text":"
    • RFC 6902 (JSON Patch)
    "},{"location":"api/basic_json/diff/#version-history","title":"Version history","text":"
    • Added in version 2.0.0.
    "},{"location":"api/basic_json/dump/","title":"nlohmann::basic_json::dump","text":"
    string_t dump(const int indent = -1,\n              const char indent_char = ' ',\n              const bool ensure_ascii = false,\n              const error_handler_t error_handler = error_handler_t::strict) const;\n

    Serialization function for JSON values. The function tries to mimic Python's json.dumps() function, and currently supports its indent and ensure_ascii parameters.

    "},{"location":"api/basic_json/dump/#parameters","title":"Parameters","text":"indent (in) If indent is nonnegative, then array elements and object members will be pretty-printed with that indent level. An indent level of 0 will only insert newlines. -1 (the default) selects the most compact representation. indent_char (in) The character to use for indentation if indent is greater than 0. The default is (space). ensure_ascii (in) If ensure_ascii is true, all non-ASCII characters in the output are escaped with \\uXXXX sequences, and the result consists of ASCII characters only. error_handler (in) how to react on decoding errors; there are three possible values (see error_handler_t: strict (throws and exception in case a decoding error occurs; default), replace (replace invalid UTF-8 sequences with U+FFFD), and ignore (ignore invalid UTF-8 sequences during serialization; all bytes are copied to the output unchanged))."},{"location":"api/basic_json/dump/#return-value","title":"Return value","text":"

    string containing the serialization of the JSON value

    "},{"location":"api/basic_json/dump/#exception-safety","title":"Exception safety","text":"

    Strong guarantee: if an exception is thrown, there are no changes to any JSON value.

    "},{"location":"api/basic_json/dump/#exceptions","title":"Exceptions","text":"

    Throws type_error.316 if a string stored inside the JSON value is not UTF-8 encoded and error_handler is set to strict

    "},{"location":"api/basic_json/dump/#complexity","title":"Complexity","text":"

    Linear.

    "},{"location":"api/basic_json/dump/#notes","title":"Notes","text":"

    Binary values are serialized as an object containing two keys:

    • \"bytes\": an array of bytes as integers
    • \"subtype\": the subtype as integer or null if the binary has no subtype
    "},{"location":"api/basic_json/dump/#examples","title":"Examples","text":"Example

    The following example shows the effect of different indent, indent_char, and ensure_ascii parameters to the result of the serialization.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // create JSON values\n    json j_object = {{\"one\", 1}, {\"two\", 2}};\n    json j_array = {1, 2, 4, 8, 16};\n    json j_string = \"Hell\u00f6 \ud83d\ude00!\";\n\n    // call dump()\n    std::cout << \"objects:\" << '\\n'\n              << j_object.dump() << \"\\n\\n\"\n              << j_object.dump(-1) << \"\\n\\n\"\n              << j_object.dump(0) << \"\\n\\n\"\n              << j_object.dump(4) << \"\\n\\n\"\n              << j_object.dump(1, '\\t') << \"\\n\\n\";\n\n    std::cout << \"arrays:\" << '\\n'\n              << j_array.dump() << \"\\n\\n\"\n              << j_array.dump(-1) << \"\\n\\n\"\n              << j_array.dump(0) << \"\\n\\n\"\n              << j_array.dump(4) << \"\\n\\n\"\n              << j_array.dump(1, '\\t') << \"\\n\\n\";\n\n    std::cout << \"strings:\" << '\\n'\n              << j_string.dump() << '\\n'\n              << j_string.dump(-1, ' ', true) << '\\n';\n\n    // create JSON value with invalid UTF-8 byte sequence\n    json j_invalid = \"\u00e4\\xA9\u00fc\";\n    try\n    {\n        std::cout << j_invalid.dump() << std::endl;\n    }\n    catch (const json::type_error& e)\n    {\n        std::cout << e.what() << std::endl;\n    }\n\n    std::cout << \"string with replaced invalid characters: \"\n              << j_invalid.dump(-1, ' ', false, json::error_handler_t::replace)\n              << \"\\nstring with ignored invalid characters: \"\n              << j_invalid.dump(-1, ' ', false, json::error_handler_t::ignore)\n              << '\\n';\n}\n

    Output:

    objects:\n{\"one\":1,\"two\":2}\n\n{\"one\":1,\"two\":2}\n\n{\n\"one\": 1,\n\"two\": 2\n}\n\n{\n    \"one\": 1,\n    \"two\": 2\n}\n\n{\n    \"one\": 1,\n    \"two\": 2\n}\n\narrays:\n[1,2,4,8,16]\n\n[1,2,4,8,16]\n\n[\n1,\n2,\n4,\n8,\n16\n]\n\n[\n    1,\n    2,\n    4,\n    8,\n    16\n]\n\n[\n    1,\n    2,\n    4,\n    8,\n    16\n]\n\nstrings:\n\"Hell\u00f6 \ud83d\ude00!\"\n\"Hell\\u00f6 \\ud83d\\ude00!\"\n[json.exception.type_error.316] invalid UTF-8 byte at index 2: 0xA9\nstring with replaced invalid characters: \"\u00e4\ufffd\u00fc\"\nstring with ignored invalid characters: \"\u00e4\u00fc\"\n
    "},{"location":"api/basic_json/dump/#version-history","title":"Version history","text":"
    • Added in version 1.0.0.
    • Indentation character indent_char, option ensure_ascii and exceptions added in version 3.0.0.
    • Error handlers added in version 3.4.0.
    • Serialization of binary values added in version 3.8.0.
    "},{"location":"api/basic_json/emplace/","title":"nlohmann::basic_json::emplace","text":"
    template<class... Args>\nstd::pair<iterator, bool> emplace(Args&& ... args);\n

    Inserts a new element into a JSON object constructed in-place with the given args if there is no element with the key in the container. If the function is called on a JSON null value, an empty object is created before appending the value created from args.

    "},{"location":"api/basic_json/emplace/#template-parameters","title":"Template parameters","text":"Args compatible types to create a basic_json object"},{"location":"api/basic_json/emplace/#iterator-invalidation","title":"Iterator invalidation","text":"

    For ordered_json, adding a value to an object can yield a reallocation, in which case all iterators (including the end() iterator) and all references to the elements are invalidated.

    "},{"location":"api/basic_json/emplace/#parameters","title":"Parameters","text":"args (in) arguments to forward to a constructor of basic_json"},{"location":"api/basic_json/emplace/#return-value","title":"Return value","text":"

    a pair consisting of an iterator to the inserted element, or the already-existing element if no insertion happened, and a bool denoting whether the insertion took place.

    "},{"location":"api/basic_json/emplace/#exceptions","title":"Exceptions","text":"

    Throws type_error.311 when called on a type other than JSON object or null; example: \"cannot use emplace() with number\"

    "},{"location":"api/basic_json/emplace/#complexity","title":"Complexity","text":"

    Logarithmic in the size of the container, O(log(size())).

    "},{"location":"api/basic_json/emplace/#examples","title":"Examples","text":"Example

    The example shows how emplace() can be used to add elements to a JSON object. Note how the null value was silently converted to a JSON object. Further note how no value is added if there was already one value stored with the same key.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // create JSON values\n    json object = {{\"one\", 1}, {\"two\", 2}};\n    json null;\n\n    // print values\n    std::cout << object << '\\n';\n    std::cout << null << '\\n';\n\n    // add values\n    auto res1 = object.emplace(\"three\", 3);\n    null.emplace(\"A\", \"a\");\n    null.emplace(\"B\", \"b\");\n\n    // the following call will not add an object, because there is already\n    // a value stored at key \"B\"\n    auto res2 = null.emplace(\"B\", \"c\");\n\n    // print values\n    std::cout << object << '\\n';\n    std::cout << *res1.first << \" \" << std::boolalpha << res1.second << '\\n';\n\n    std::cout << null << '\\n';\n    std::cout << *res2.first << \" \" << std::boolalpha << res2.second << '\\n';\n}\n

    Output:

    {\"one\":1,\"two\":2}\nnull\n{\"one\":1,\"three\":3,\"two\":2}\n3 true\n{\"A\":\"a\",\"B\":\"b\"}\n\"b\" false\n
    "},{"location":"api/basic_json/emplace/#version-history","title":"Version history","text":"
    • Since version 2.0.8.
    "},{"location":"api/basic_json/emplace_back/","title":"nlohmann::basic_json::emplace_back","text":"
    template<class... Args>\nreference emplace_back(Args&& ... args);\n

    Creates a JSON value from the passed parameters args to the end of the JSON value. If the function is called on a JSON null value, an empty array is created before appending the value created from args.

    "},{"location":"api/basic_json/emplace_back/#template-parameters","title":"Template parameters","text":"Args compatible types to create a basic_json object"},{"location":"api/basic_json/emplace_back/#iterator-invalidation","title":"Iterator invalidation","text":"

    By adding an element to the end of the array, a reallocation can happen, in which case all iterators (including the end() iterator) and all references to the elements are invalidated. Otherwise, only the end() iterator is invalidated.

    "},{"location":"api/basic_json/emplace_back/#parameters","title":"Parameters","text":"args (in) arguments to forward to a constructor of basic_json"},{"location":"api/basic_json/emplace_back/#return-value","title":"Return value","text":"

    reference to the inserted element

    "},{"location":"api/basic_json/emplace_back/#exceptions","title":"Exceptions","text":"

    Throws type_error.311 when called on a type other than JSON array or null; example: \"cannot use emplace_back() with number\"

    "},{"location":"api/basic_json/emplace_back/#complexity","title":"Complexity","text":"

    Amortized constant.

    "},{"location":"api/basic_json/emplace_back/#examples","title":"Examples","text":"Example

    The example shows how emplace_back() can be used to add elements to a JSON array. Note how the null value was silently converted to a JSON array.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // create JSON values\n    json array = {1, 2, 3, 4, 5};\n    json null;\n\n    // print values\n    std::cout << array << '\\n';\n    std::cout << null << '\\n';\n\n    // add values\n    array.emplace_back(6);\n    null.emplace_back(\"first\");\n    null.emplace_back(3, \"second\");\n\n    // print values\n    std::cout << array << '\\n';\n    std::cout << null << '\\n';\n}\n

    Output:

    [1,2,3,4,5]\nnull\n[1,2,3,4,5,6]\n[\"first\",[\"second\",\"second\",\"second\"]]\n
    "},{"location":"api/basic_json/emplace_back/#see-also","title":"See also","text":"
    • operator+= add a value to an array/object
    • push_back add a value to an array/object
    "},{"location":"api/basic_json/emplace_back/#version-history","title":"Version history","text":"
    • Since version 2.0.8.
    • Returns reference since 3.7.0.
    "},{"location":"api/basic_json/empty/","title":"nlohmann::basic_json::empty","text":"
    bool empty() const noexcept;\n

    Checks if a JSON value has no elements (i.e., whether its size() is 0).

    "},{"location":"api/basic_json/empty/#return-value","title":"Return value","text":"

    The return value depends on the different types and is defined as follows:

    Value type return value null true boolean false string false number false binary false object result of function object_t::empty() array result of function array_t::empty()"},{"location":"api/basic_json/empty/#exception-safety","title":"Exception safety","text":"

    No-throw guarantee: this function never throws exceptions.

    "},{"location":"api/basic_json/empty/#complexity","title":"Complexity","text":"

    Constant, as long as array_t and object_t satisfy the Container concept; that is, their empty() functions have constant complexity.

    "},{"location":"api/basic_json/empty/#possible-implementation","title":"Possible implementation","text":"
    bool empty() const noexcept\n{\n    return size() == 0;\n}\n
    "},{"location":"api/basic_json/empty/#notes","title":"Notes","text":"

    This function does not return whether a string stored as JSON value is empty -- it returns whether the JSON container itself is empty which is false in the case of a string.

    "},{"location":"api/basic_json/empty/#examples","title":"Examples","text":"Example

    The following code uses empty() to check if a JSON object contains any elements.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // create JSON values\n    json j_null;\n    json j_boolean = true;\n    json j_number_integer = 17;\n    json j_number_float = 23.42;\n    json j_object = {{\"one\", 1}, {\"two\", 2}};\n    json j_object_empty(json::value_t::object);\n    json j_array = {1, 2, 4, 8, 16};\n    json j_array_empty(json::value_t::array);\n    json j_string = \"Hello, world\";\n\n    // call empty()\n    std::cout << std::boolalpha;\n    std::cout << j_null.empty() << '\\n';\n    std::cout << j_boolean.empty() << '\\n';\n    std::cout << j_number_integer.empty() << '\\n';\n    std::cout << j_number_float.empty() << '\\n';\n    std::cout << j_object.empty() << '\\n';\n    std::cout << j_object_empty.empty() << '\\n';\n    std::cout << j_array.empty() << '\\n';\n    std::cout << j_array_empty.empty() << '\\n';\n    std::cout << j_string.empty() << '\\n';\n}\n

    Output:

    true\nfalse\nfalse\nfalse\nfalse\ntrue\nfalse\ntrue\nfalse\n
    "},{"location":"api/basic_json/empty/#version-history","title":"Version history","text":"
    • Added in version 1.0.0.
    • Extended to return false for binary types in version 3.8.0.
    "},{"location":"api/basic_json/end/","title":"nlohmann::basic_json::end","text":"
    iterator end() noexcept;\nconst_iterator end() const noexcept;\n

    Returns an iterator to one past the last element.

    "},{"location":"api/basic_json/end/#return-value","title":"Return value","text":"

    iterator one past the last element

    "},{"location":"api/basic_json/end/#exception-safety","title":"Exception safety","text":"

    No-throw guarantee: this member function never throws exceptions.

    "},{"location":"api/basic_json/end/#complexity","title":"Complexity","text":"

    Constant.

    "},{"location":"api/basic_json/end/#examples","title":"Examples","text":"Example

    The following code shows an example for end().

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // create an array value\n    json array = {1, 2, 3, 4, 5};\n\n    // get an iterator to one past the last element\n    json::iterator it = array.end();\n\n    // decrement the iterator to point to the last element\n    --it;\n\n    // serialize the element that the iterator points to\n    std::cout << *it << '\\n';\n}\n

    Output:

    5\n
    "},{"location":"api/basic_json/end/#version-history","title":"Version history","text":"
    • Added in version 1.0.0.
    "},{"location":"api/basic_json/end_pos/","title":"nlohmann::basic_json::end_pos","text":"
    #if JSON_DIAGNOSTIC_POSITIONS\nconstexpr std::size_t end_pos() const noexcept;\n#endif\n

    Returns the position immediately following the last character of the JSON string from which the value was parsed from.

    JSON type return value object position after the closing } array position after the closing ] string position after the closing \" number position after the last character boolean position after e null position after l"},{"location":"api/basic_json/end_pos/#return-value","title":"Return value","text":"

    the position of the character following the last character of the given value in the parsed JSON string, if the value was created by the parse function, or std::string::npos if the value was constructed otherwise

    "},{"location":"api/basic_json/end_pos/#exception-safety","title":"Exception safety","text":"

    No-throw guarantee: this member function never throws exceptions.

    "},{"location":"api/basic_json/end_pos/#complexity","title":"Complexity","text":"

    Constant.

    "},{"location":"api/basic_json/end_pos/#notes","title":"Notes","text":"

    Note

    The function is only available if macro JSON_DIAGNOSTIC_POSITIONS has been defined to 1 before including the library header.

    Invalidation

    The returned positions are only valid as long as the JSON value is not changed. The positions are not updated when the JSON value is changed.

    "},{"location":"api/basic_json/end_pos/#examples","title":"Examples","text":"Example 
    #include <iostream>\n\n#define JSON_DIAGNOSTIC_POSITIONS 1\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    std::string json_string = R\"(\n    {\n        \"address\": {\n            \"street\": \"Fake Street\",\n            \"housenumber\": 1\n        }\n    }\n    )\";\n    json j = json::parse(json_string);\n\n    std::cout << \"Root diagnostic positions: \\n\";\n    std::cout << \"\\tstart_pos: \" << j.start_pos() << '\\n';\n    std::cout << \"\\tend_pos:\" << j.end_pos() << \"\\n\";\n    std::cout << \"Original string: \\n\";\n    std::cout << \"{\\n        \\\"address\\\": {\\n            \\\"street\\\": \\\"Fake Street\\\",\\n            \\\"housenumber\\\": 1\\n        }\\n    }\" << \"\\n\";\n    std::cout << \"Parsed string: \\n\";\n    std::cout << json_string.substr(j.start_pos(), j.end_pos() - j.start_pos()) << \"\\n\\n\";\n\n    std::cout << \"address diagnostic positions: \\n\";\n    std::cout << \"\\tstart_pos:\" << j[\"address\"].start_pos() << '\\n';\n    std::cout << \"\\tend_pos:\" << j[\"address\"].end_pos() << \"\\n\\n\";\n    std::cout << \"Original string: \\n\";\n    std::cout << \"{            \\\"street\\\": \\\"Fake Street\\\",\\n            \\\"housenumber\\\": 1\\n        }\" << \"\\n\";\n    std::cout << \"Parsed string: \\n\";\n    std::cout << json_string.substr(j[\"address\"].start_pos(), j[\"address\"].end_pos() - j[\"address\"].start_pos()) << \"\\n\\n\";\n\n    std::cout << \"street diagnostic positions: \\n\";\n    std::cout << \"\\tstart_pos:\" << j[\"address\"][\"street\"].start_pos() << '\\n';\n    std::cout << \"\\tend_pos:\" << j[\"address\"][\"street\"].end_pos() << \"\\n\\n\";\n    std::cout << \"Original string: \\n\";\n    std::cout << \"\\\"Fake Street\\\"\" << \"\\n\";\n    std::cout << \"Parsed string: \\n\";\n    std::cout << json_string.substr(j[\"address\"][\"street\"].start_pos(), j[\"address\"][\"street\"].end_pos() - j[\"address\"][\"street\"].start_pos()) << \"\\n\\n\";\n\n    std::cout << \"housenumber diagnostic positions: \\n\";\n    std::cout << \"\\tstart_pos:\" << j[\"address\"][\"housenumber\"].start_pos() << '\\n';\n    std::cout << \"\\tend_pos:\" << j[\"address\"][\"housenumber\"].end_pos() << \"\\n\\n\";\n    std::cout << \"Original string: \\n\";\n    std::cout << \"1\" << \"\\n\";\n    std::cout << \"Parsed string: \\n\";\n    std::cout << json_string.substr(j[\"address\"][\"housenumber\"].start_pos(), j[\"address\"][\"housenumber\"].end_pos() - j[\"address\"][\"housenumber\"].start_pos()) << \"\\n\\n\";\n}\n

    Output:

    Root diagnostic positions: \n    start_pos: 5\n    end_pos:109\nOriginal string: \n{\n        \"address\": {\n            \"street\": \"Fake Street\",\n            \"housenumber\": 1\n        }\n    }\nParsed string: \n{\n        \"address\": {\n            \"street\": \"Fake Street\",\n            \"housenumber\": 1\n        }\n    }\n\naddress diagnostic positions: \n    start_pos:26\n    end_pos:103\n\nOriginal string: \n{            \"street\": \"Fake Street\",\n            \"housenumber\": 1\n        }\nParsed string: \n{\n            \"street\": \"Fake Street\",\n            \"housenumber\": 1\n        }\n\nstreet diagnostic positions: \n    start_pos:50\n    end_pos:63\n\nOriginal string: \n\"Fake Street\"\nParsed string: \n\"Fake Street\"\n\nhousenumber diagnostic positions: \n    start_pos:92\n    end_pos:93\n\nOriginal string: \n1\nParsed string: \n1\n

    The output shows the start/end positions of all the objects and fields in the JSON string.

    "},{"location":"api/basic_json/end_pos/#see-also","title":"See also","text":"
    • start_pos to access the start position
    • JSON_DIAGNOSTIC_POSITIONS for an overview of the diagnostic positions
    "},{"location":"api/basic_json/end_pos/#version-history","title":"Version history","text":"
    • Added in version 3.12.0.
    "},{"location":"api/basic_json/erase/","title":"nlohmann::basic_json::erase","text":"
    // (1)\niterator erase(iterator pos);\nconst_iterator erase(const_iterator pos);\n\n// (2)\niterator erase(iterator first, iterator last);\nconst_iterator erase(const_iterator first, const_iterator last);\n\n// (3)\nsize_type erase(const typename object_t::key_type& key);\n\n// (4)\ntemplate<typename KeyType>\nsize_type erase(KeyType&& key);\n\n// (5)\nvoid erase(const size_type idx);\n

    1. Removes an element from a JSON value specified by iterator pos. The iterator pos must be valid and dereferenceable. Thus, the end() iterator (which is valid, but is not dereferenceable) cannot be used as a value for pos.

      If called on a primitive type other than null, the resulting JSON value will be null.

    2. Remove an element range specified by [first; last) from a JSON value. The iterator first does not need to be dereferenceable if first == last: erasing an empty range is a no-op.

      If called on a primitive type other than null, the resulting JSON value will be null.

    3. Removes an element from a JSON object by key.

    4. See 3. This overload is only available if KeyType is comparable with typename object_t::key_type and typename object_comparator_t::is_transparent denotes a type.

    5. Removes an element from a JSON array by index.

    "},{"location":"api/basic_json/erase/#template-parameters","title":"Template parameters","text":"KeyType A type for an object key other than json_pointer that is comparable with string_t using object_comparator_t. This can also be a string view (C++17)."},{"location":"api/basic_json/erase/#parameters","title":"Parameters","text":"pos (in) iterator to the element to remove first (in) iterator to the beginning of the range to remove last (in) iterator past the end of the range to remove key (in) object key of the elements to remove idx (in) array index of the element to remove"},{"location":"api/basic_json/erase/#return-value","title":"Return value","text":"
    1. Iterator following the last removed element. If the iterator pos refers to the last element, the end() iterator is returned.
    2. Iterator following the last removed element. If the iterator last refers to the last element, the end() iterator is returned.
    3. Number of elements removed. If ObjectType is the default std::map type, the return value will always be 0 (key was not found) or 1 (key was found).
    4. See 3.
    5. (none)
    "},{"location":"api/basic_json/erase/#exception-safety","title":"Exception safety","text":"

    Strong exception safety: if an exception occurs, the original value stays intact.

    "},{"location":"api/basic_json/erase/#exceptions","title":"Exceptions","text":"
    1. The function can throw the following exceptions:
      • Throws type_error.307 if called on a null value; example: \"cannot use erase() with null\"
      • Throws invalid_iterator.202 if called on an iterator which does not belong to the current JSON value; example: \"iterator does not fit current value\"
      • Throws invalid_iterator.205 if called on a primitive type with invalid iterator (i.e., any iterator which is not begin()); example: \"iterator out of range\"
    2. The function can throw the following exceptions:
      • Throws type_error.307 if called on a null value; example: \"cannot use erase() with null\"
      • Throws invalid_iterator.203 if called on iterators which does not belong to the current JSON value; example: \"iterators do not fit current value\"
      • Throws invalid_iterator.204 if called on a primitive type with invalid iterators (i.e., if first != begin() and last != end()); example: \"iterators out of range\"
    3. The function can throw the following exceptions:
      • Throws type_error.307 when called on a type other than JSON object; example: \"cannot use erase() with null\"
    4. See 3.
    5. The function can throw the following exceptions:
      • Throws type_error.307 when called on a type other than JSON object; example: \"cannot use erase() with null\"
      • Throws out_of_range.401 when idx >= size(); example: \"array index 17 is out of range\"
    "},{"location":"api/basic_json/erase/#complexity","title":"Complexity","text":"
    1. The complexity depends on the type:
      • objects: amortized constant
      • arrays: linear in distance between pos and the end of the container
      • strings and binary: linear in the length of the member
      • other types: constant
    2. The complexity depends on the type:
      • objects: log(size()) + std::distance(first, last)
      • arrays: linear in the distance between first and last, plus linear in the distance between last and end of the container
      • strings and binary: linear in the length of the member
      • other types: constant
    3. log(size()) + count(key)
    4. log(size()) + count(key)
    5. Linear in distance between idx and the end of the container.
    "},{"location":"api/basic_json/erase/#notes","title":"Notes","text":"
    1. Invalidates iterators and references at or after the point of the erase, including the end() iterator.
    2. (none)
    3. References and iterators to the erased elements are invalidated. Other references and iterators are not affected.
    4. See 3.
    5. (none)
    "},{"location":"api/basic_json/erase/#examples","title":"Examples","text":"Example: (1) remove element given an iterator

    The example shows the effect of erase() for different JSON types using an iterator.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // create JSON values\n    json j_boolean = true;\n    json j_number_integer = 17;\n    json j_number_float = 23.42;\n    json j_object = {{\"one\", 1}, {\"two\", 2}};\n    json j_array = {1, 2, 4, 8, 16};\n    json j_string = \"Hello, world\";\n\n    // call erase()\n    j_boolean.erase(j_boolean.begin());\n    j_number_integer.erase(j_number_integer.begin());\n    j_number_float.erase(j_number_float.begin());\n    j_object.erase(j_object.find(\"two\"));\n    j_array.erase(j_array.begin() + 2);\n    j_string.erase(j_string.begin());\n\n    // print values\n    std::cout << j_boolean << '\\n';\n    std::cout << j_number_integer << '\\n';\n    std::cout << j_number_float << '\\n';\n    std::cout << j_object << '\\n';\n    std::cout << j_array << '\\n';\n    std::cout << j_string << '\\n';\n}\n

    Output:

    null\nnull\nnull\n{\"one\":1}\n[1,2,8,16]\nnull\n
    Example: (2) remove elements given an iterator range

    The example shows the effect of erase() for different JSON types using an iterator range.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // create JSON values\n    json j_boolean = true;\n    json j_number_integer = 17;\n    json j_number_float = 23.42;\n    json j_object = {{\"one\", 1}, {\"two\", 2}};\n    json j_array = {1, 2, 4, 8, 16};\n    json j_string = \"Hello, world\";\n\n    // call erase()\n    j_boolean.erase(j_boolean.begin(), j_boolean.end());\n    j_number_integer.erase(j_number_integer.begin(), j_number_integer.end());\n    j_number_float.erase(j_number_float.begin(), j_number_float.end());\n    j_object.erase(j_object.find(\"two\"), j_object.end());\n    j_array.erase(j_array.begin() + 1, j_array.begin() + 3);\n    j_string.erase(j_string.begin(), j_string.end());\n\n    // print values\n    std::cout << j_boolean << '\\n';\n    std::cout << j_number_integer << '\\n';\n    std::cout << j_number_float << '\\n';\n    std::cout << j_object << '\\n';\n    std::cout << j_array << '\\n';\n    std::cout << j_string << '\\n';\n}\n

    Output:

    null\nnull\nnull\n{\"one\":1}\n[1,8,16]\nnull\n
    Example: (3) remove element from a JSON object given a key

    The example shows the effect of erase() for different JSON types using an object key.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // create a JSON object\n    json j_object = {{\"one\", 1}, {\"two\", 2}};\n\n    // call erase()\n    auto count_one = j_object.erase(\"one\");\n    auto count_three = j_object.erase(\"three\");\n\n    // print values\n    std::cout << j_object << '\\n';\n    std::cout << count_one << \" \" << count_three << '\\n';\n}\n

    Output:

    {\"two\":2}\n1 0\n
    Example: (4) remove element from a JSON object given a key using string_view

    The example shows the effect of erase() for different JSON types using an object key.

    #include <iostream>\n#include <string_view>\n#include <nlohmann/json.hpp>\n\nusing namespace std::string_view_literals;\nusing json = nlohmann::json;\n\nint main()\n{\n    // create a JSON object\n    json j_object = {{\"one\", 1}, {\"two\", 2}};\n\n    // call erase()\n    auto count_one = j_object.erase(\"one\"sv);\n    auto count_three = j_object.erase(\"three\"sv);\n\n    // print values\n    std::cout << j_object << '\\n';\n    std::cout << count_one << \" \" << count_three << '\\n';\n}\n

    Output:

    {\"two\":2}\n1 0\n
    Example: (5) remove element from a JSON array given an index

    The example shows the effect of erase() using an array index.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // create a JSON array\n    json j_array = {0, 1, 2, 3, 4, 5};\n\n    // call erase()\n    j_array.erase(2);\n\n    // print values\n    std::cout << j_array << '\\n';\n}\n

    Output:

    [0,1,3,4,5]\n
    "},{"location":"api/basic_json/erase/#version-history","title":"Version history","text":"
    1. Added in version 1.0.0. Added support for binary types in version 3.8.0.
    2. Added in version 1.0.0. Added support for binary types in version 3.8.0.
    3. Added in version 1.0.0.
    4. Added in version 3.11.0.
    5. Added in version 1.0.0.
    "},{"location":"api/basic_json/error_handler_t/","title":"nlohmann::basic_json::error_handler_t","text":"
    enum class error_handler_t {\n    strict,\n    replace,\n    ignore\n};\n

    This enumeration is used in the dump function to choose how to treat decoding errors while serializing a basic_json value. Three values are differentiated:

    strict throw a type_error exception in case of invalid UTF-8 replace replace invalid UTF-8 sequences with U+FFFD (\ufffd REPLACEMENT CHARACTER) ignore ignore invalid UTF-8 sequences; all bytes are copied to the output unchanged"},{"location":"api/basic_json/error_handler_t/#examples","title":"Examples","text":"Example

    The example below shows how the different values of the error_handler_t influence the behavior of dump when reading serializing an invalid UTF-8 sequence.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // create JSON value with invalid UTF-8 byte sequence\n    json j_invalid = \"\u00e4\\xA9\u00fc\";\n    try\n    {\n        std::cout << j_invalid.dump() << std::endl;\n    }\n    catch (const json::type_error& e)\n    {\n        std::cout << e.what() << std::endl;\n    }\n\n    std::cout << \"string with replaced invalid characters: \"\n              << j_invalid.dump(-1, ' ', false, json::error_handler_t::replace)\n              << \"\\nstring with ignored invalid characters: \"\n              << j_invalid.dump(-1, ' ', false, json::error_handler_t::ignore)\n              << '\\n';\n}\n

    Output:

    [json.exception.type_error.316] invalid UTF-8 byte at index 2: 0xA9\nstring with replaced invalid characters: \"\u00e4\ufffd\u00fc\"\nstring with ignored invalid characters: \"\u00e4\u00fc\"\n
    "},{"location":"api/basic_json/error_handler_t/#version-history","title":"Version history","text":"
    • Added in version 3.4.0.
    "},{"location":"api/basic_json/exception/","title":"nlohmann::basic_json::exception","text":"
    class exception : public std::exception;\n

    This class is an extension of std::exception objects with a member id for exception ids. It is used as the base class for all exceptions thrown by the basic_json class. This class can hence be used as \"wildcard\" to catch exceptions, see example below.

    classDiagram\n  direction LR\n\n    class std_exception [\"std::exception\"] {\n        <<interface>>\n    }\n\n    class json_exception [\"basic_json::exception\"] {\n        +const int id\n        +const char* what() const\n    }\n\n    class json_parse_error [\"basic_json::parse_error\"] {\n        +const std::size_t byte\n    }\n\n    class json_invalid_iterator [\"basic_json::invalid_iterator\"]\n    class json_type_error [\"basic_json::type_error\"]\n    class json_out_of_range [\"basic_json::out_of_range\"]\n    class json_other_error [\"basic_json::other_error\"]\n\n    std_exception <|-- json_exception\n    json_exception <|-- json_parse_error\n    json_exception <|-- json_invalid_iterator\n    json_exception <|-- json_type_error\n    json_exception <|-- json_out_of_range\n    json_exception <|-- json_other_error\n\n    style json_exception fill:#CCCCFF

    Subclasses:

    • parse_error for exceptions indicating a parse error
    • invalid_iterator for exceptions indicating errors with iterators
    • type_error for exceptions indicating executing a member function with a wrong type
    • out_of_range for exceptions indicating access out of the defined range
    • other_error for exceptions indicating other library errors
    "},{"location":"api/basic_json/exception/#member-functions","title":"Member functions","text":"
    • what - returns explanatory string
    "},{"location":"api/basic_json/exception/#member-variables","title":"Member variables","text":"
    • id - the id of the exception
    "},{"location":"api/basic_json/exception/#notes","title":"Notes","text":"

    To have nothrow-copy-constructible exceptions, we internally use std::runtime_error which can cope with arbitrary-length error messages. Intermediate strings are built with static functions and then passed to the actual constructor.

    "},{"location":"api/basic_json/exception/#examples","title":"Examples","text":"Example

    The following code shows how arbitrary library exceptions can be caught.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    try\n    {\n        // calling at() for a non-existing key\n        json j = {{\"foo\", \"bar\"}};\n        json k = j.at(\"non-existing\");\n    }\n    catch (const json::exception& e)\n    {\n        // output exception information\n        std::cout << \"message: \" << e.what() << '\\n'\n                  << \"exception id: \" << e.id << std::endl;\n    }\n}\n

    Output:

    message: [json.exception.out_of_range.403] key 'non-existing' not found\nexception id: 403\n
    "},{"location":"api/basic_json/exception/#see-also","title":"See also","text":"

    List of exceptions

    "},{"location":"api/basic_json/exception/#version-history","title":"Version history","text":"
    • Since version 3.0.0.
    "},{"location":"api/basic_json/find/","title":"nlohmann::basic_json::find","text":"
    // (1)\niterator find(const typename object_t::key_type& key);\nconst_iterator find(const typename object_t::key_type& key) const;\n\n// (2)\ntemplate<typename KeyType>\niterator find(KeyType&& key);\ntemplate<typename KeyType>\nconst_iterator find(KeyType&& key) const;\n
    1. Finds an element in a JSON object with a key equivalent to key. If the element is not found or the JSON value is not an object, end() is returned.
    2. See 1. This overload is only available if KeyType is comparable with typename object_t::key_type and typename object_comparator_t::is_transparent denotes a type.
    "},{"location":"api/basic_json/find/#template-parameters","title":"Template parameters","text":"KeyType A type for an object key other than json_pointer that is comparable with string_t using object_comparator_t. This can also be a string view (C++17)."},{"location":"api/basic_json/find/#parameters","title":"Parameters","text":"key (in) key value of the element to search for."},{"location":"api/basic_json/find/#return-value","title":"Return value","text":"

    Iterator to an element with a key equivalent to key. If no such element is found or the JSON value is not an object, a past-the-end iterator (see end()) is returned.

    "},{"location":"api/basic_json/find/#exception-safety","title":"Exception safety","text":"

    Strong exception safety: if an exception occurs, the original value stays intact.

    "},{"location":"api/basic_json/find/#complexity","title":"Complexity","text":"

    Logarithmic in the size of the JSON object.

    "},{"location":"api/basic_json/find/#notes","title":"Notes","text":"

    This method always returns end() when executed on a JSON type that is not an object.

    "},{"location":"api/basic_json/find/#examples","title":"Examples","text":"Example: (1) find object element by key

    The example shows how find() is used.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // create a JSON object\n    json j_object = {{\"one\", 1}, {\"two\", 2}};\n\n    // call find\n    auto it_two = j_object.find(\"two\");\n    auto it_three = j_object.find(\"three\");\n\n    // print values\n    std::cout << std::boolalpha;\n    std::cout << \"\\\"two\\\" was found: \" << (it_two != j_object.end()) << '\\n';\n    std::cout << \"value at key \\\"two\\\": \" << *it_two << '\\n';\n    std::cout << \"\\\"three\\\" was found: \" << (it_three != j_object.end()) << '\\n';\n}\n

    Output:

    \"two\" was found: true\nvalue at key \"two\": 2\n\"three\" was found: false\n
    Example: (2) find object element by key using string_view

    The example shows how find() is used.

    #include <iostream>\n#include <string_view>\n#include <nlohmann/json.hpp>\n\nusing namespace std::string_view_literals;\nusing json = nlohmann::json;\n\nint main()\n{\n    // create a JSON object\n    json j_object = {{\"one\", 1}, {\"two\", 2}};\n\n    // call find\n    auto it_two = j_object.find(\"two\"sv);\n    auto it_three = j_object.find(\"three\"sv);\n\n    // print values\n    std::cout << std::boolalpha;\n    std::cout << \"\\\"two\\\" was found: \" << (it_two != j_object.end()) << '\\n';\n    std::cout << \"value at key \\\"two\\\": \" << *it_two << '\\n';\n    std::cout << \"\\\"three\\\" was found: \" << (it_three != j_object.end()) << '\\n';\n}\n

    Output:

    \"two\" was found: true\nvalue at key \"two\": 2\n\"three\" was found: false\n
    "},{"location":"api/basic_json/find/#see-also","title":"See also","text":"
    • contains checks whether a key exists
    "},{"location":"api/basic_json/find/#version-history","title":"Version history","text":"
    1. Added in version 3.11.0.
    2. Added in version 1.0.0. Changed to support comparable types in version 3.11.0.
    "},{"location":"api/basic_json/flatten/","title":"nlohmann::basic_json::flatten","text":"
    basic_json flatten() const;\n

    The function creates a JSON object whose keys are JSON pointers (see RFC 6901) and whose values are all primitive (see is_primitive() for more information). The original JSON value can be restored using the unflatten() function.

    "},{"location":"api/basic_json/flatten/#return-value","title":"Return value","text":"

    an object that maps JSON pointers to primitive values

    "},{"location":"api/basic_json/flatten/#exception-safety","title":"Exception safety","text":"

    Strong exception safety: if an exception occurs, the original value stays intact.

    "},{"location":"api/basic_json/flatten/#complexity","title":"Complexity","text":"

    Linear in the size of the JSON value.

    "},{"location":"api/basic_json/flatten/#notes","title":"Notes","text":"

    Empty objects and arrays are flattened to null and will not be reconstructed correctly by the unflatten() function.

    "},{"location":"api/basic_json/flatten/#examples","title":"Examples","text":"Example

    The following code shows how a JSON object is flattened to an object whose keys consist of JSON pointers.

    #include <iostream>\n#include <iomanip>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // create JSON value\n    json j =\n    {\n        {\"pi\", 3.141},\n        {\"happy\", true},\n        {\"name\", \"Niels\"},\n        {\"nothing\", nullptr},\n        {\n            \"answer\", {\n                {\"everything\", 42}\n            }\n        },\n        {\"list\", {1, 0, 2}},\n        {\n            \"object\", {\n                {\"currency\", \"USD\"},\n                {\"value\", 42.99}\n            }\n        }\n    };\n\n    // call flatten()\n    std::cout << std::setw(4) << j.flatten() << '\\n';\n}\n

    Output:

    {\n    \"/answer/everything\": 42,\n    \"/happy\": true,\n    \"/list/0\": 1,\n    \"/list/1\": 0,\n    \"/list/2\": 2,\n    \"/name\": \"Niels\",\n    \"/nothing\": null,\n    \"/object/currency\": \"USD\",\n    \"/object/value\": 42.99,\n    \"/pi\": 3.141\n}\n
    "},{"location":"api/basic_json/flatten/#see-also","title":"See also","text":"
    • unflatten the reverse function
    "},{"location":"api/basic_json/flatten/#version-history","title":"Version history","text":"
    • Added in version 2.0.0.
    "},{"location":"api/basic_json/from_bjdata/","title":"nlohmann::basic_json::from_bjdata","text":"
    // (1)\ntemplate<typename InputType>\nstatic basic_json from_bjdata(InputType&& i,\n                              const bool strict = true,\n                              const bool allow_exceptions = true);\n// (2)\ntemplate<typename IteratorType>\nstatic basic_json from_bjdata(IteratorType first, IteratorType last,\n                              const bool strict = true,\n                              const bool allow_exceptions = true);\n

    Deserializes a given input to a JSON value using the BJData (Binary JData) serialization format.

    1. Reads from a compatible input.
    2. Reads from an iterator range.

    The exact mapping and its limitations are described on a dedicated page.

    "},{"location":"api/basic_json/from_bjdata/#template-parameters","title":"Template parameters","text":"InputType

    A compatible input, for instance:

    • an std::istream object
    • a FILE pointer
    • a C-style array of characters
    • a pointer to a null-terminated string of single byte characters
    • an object obj for which begin(obj) and end(obj) produces a valid pair of iterators.
    IteratorType a compatible iterator type"},{"location":"api/basic_json/from_bjdata/#parameters","title":"Parameters","text":"i (in) an input in BJData format convertible to an input adapter first (in) iterator to the start of the input last (in) iterator to the end of the input strict (in) whether to expect the input to be consumed until EOF (true by default) allow_exceptions (in) whether to throw exceptions in case of a parse error (optional, true by default)"},{"location":"api/basic_json/from_bjdata/#return-value","title":"Return value","text":"

    deserialized JSON value; in case of a parse error and allow_exceptions set to false, the return value will be value_t::discarded. The latter can be checked with is_discarded.

    "},{"location":"api/basic_json/from_bjdata/#exception-safety","title":"Exception safety","text":"

    Strong guarantee: if an exception is thrown, there are no changes in the JSON value.

    "},{"location":"api/basic_json/from_bjdata/#exceptions","title":"Exceptions","text":"
    • Throws parse_error.110 if the given input ends prematurely or the end of the file was not reached when strict was set to true
    • Throws parse_error.112 if a parse error occurs
    • Throws parse_error.113 if a string could not be parsed successfully
    "},{"location":"api/basic_json/from_bjdata/#complexity","title":"Complexity","text":"

    Linear in the size of the input.

    "},{"location":"api/basic_json/from_bjdata/#examples","title":"Examples","text":"Example

    The example shows the deserialization of a byte vector in BJData format to a JSON value.

    #include <iostream>\n#include <iomanip>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // create byte vector\n    std::vector<std::uint8_t> v = {0x7B, 0x69, 0x07, 0x63, 0x6F, 0x6D, 0x70, 0x61,\n                                   0x63, 0x74, 0x54, 0x69, 0x06, 0x73, 0x63, 0x68,\n                                   0x65, 0x6D, 0x61, 0x69, 0x00, 0x7D\n                                  };\n\n    // deserialize it with BJData\n    json j = json::from_bjdata(v);\n\n    // print the deserialized JSON value\n    std::cout << std::setw(2) << j << std::endl;\n}\n

    Output:

    {\n  \"compact\": true,\n  \"schema\": 0\n}\n
    "},{"location":"api/basic_json/from_bjdata/#version-history","title":"Version history","text":"
    • Added in version 3.11.0.
    "},{"location":"api/basic_json/from_bson/","title":"nlohmann::basic_json::from_bson","text":"
    // (1)\ntemplate<typename InputType>\nstatic basic_json from_bson(InputType&& i,\n                            const bool strict = true,\n                            const bool allow_exceptions = true);\n// (2)\ntemplate<typename IteratorType>\nstatic basic_json from_bson(IteratorType first, IteratorType last,\n                            const bool strict = true,\n                            const bool allow_exceptions = true);\n

    Deserializes a given input to a JSON value using the BSON (Binary JSON) serialization format.

    1. Reads from a compatible input.
    2. Reads from an iterator range.

    The exact mapping and its limitations are described on a dedicated page.

    "},{"location":"api/basic_json/from_bson/#template-parameters","title":"Template parameters","text":"InputType

    A compatible input, for instance:

    • an std::istream object
    • a FILE pointer
    • a C-style array of characters
    • a pointer to a null-terminated string of single byte characters
    • an object obj for which begin(obj) and end(obj) produces a valid pair of iterators.
    IteratorType a compatible iterator type"},{"location":"api/basic_json/from_bson/#parameters","title":"Parameters","text":"i (in) an input in BSON format convertible to an input adapter first (in) iterator to the start of the input last (in) iterator to the end of the input strict (in) whether to expect the input to be consumed until EOF (true by default) allow_exceptions (in) whether to throw exceptions in case of a parse error (optional, true by default)"},{"location":"api/basic_json/from_bson/#return-value","title":"Return value","text":"

    deserialized JSON value; in case of a parse error and allow_exceptions set to false, the return value will be value_t::discarded. The latter can be checked with is_discarded.

    "},{"location":"api/basic_json/from_bson/#exception-safety","title":"Exception safety","text":"

    Strong guarantee: if an exception is thrown, there are no changes in the JSON value.

    "},{"location":"api/basic_json/from_bson/#exceptions","title":"Exceptions","text":"

    Throws parse_error.114 if an unsupported BSON record type is encountered.

    "},{"location":"api/basic_json/from_bson/#complexity","title":"Complexity","text":"

    Linear in the size of the input.

    "},{"location":"api/basic_json/from_bson/#examples","title":"Examples","text":"Example

    The example shows the deserialization of a byte vector in BSON format to a JSON value.

    #include <iostream>\n#include <iomanip>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // create byte vector\n    std::vector<std::uint8_t> v = {0x1b, 0x00, 0x00, 0x00, 0x08, 0x63, 0x6f, 0x6d,\n                                   0x70, 0x61, 0x63, 0x74, 0x00, 0x01, 0x10, 0x73,\n                                   0x63, 0x68, 0x65, 0x6d, 0x61, 0x00, 0x00, 0x00,\n                                   0x00, 0x00, 0x00\n                                  };\n\n    // deserialize it with BSON\n    json j = json::from_bson(v);\n\n    // print the deserialized JSON value\n    std::cout << std::setw(2) << j << std::endl;\n}\n

    Output:

    {\n  \"compact\": true,\n  \"schema\": 0\n}\n
    "},{"location":"api/basic_json/from_bson/#see-also","title":"See also","text":"
    • BSON specification
    • to_bson for the analogous serialization
    • from_cbor for the related CBOR format
    • from_msgpack for the related MessagePack format
    • from_ubjson for the related UBJSON format
    "},{"location":"api/basic_json/from_bson/#version-history","title":"Version history","text":"
    • Added in version 3.4.0.

    Deprecation

    • Overload (2) replaces calls to from_bson with a pointer and a length as first two parameters, which has been deprecated in version 3.8.0. This overload will be removed in version 4.0.0. Please replace all calls like from_bson(ptr, len, ...); with from_bson(ptr, ptr+len, ...);.
    • Overload (2) replaces calls to from_bson with a pair of iterators as their first parameter, which has been deprecated in version 3.8.0. This overload will be removed in version 4.0.0. Please replace all calls like from_bson({ptr, ptr+len}, ...); with from_bson(ptr, ptr+len, ...);.

    You should be warned by your compiler with a -Wdeprecated-declarations warning if you are using a deprecated function.

    "},{"location":"api/basic_json/from_cbor/","title":"nlohmann::basic_json::from_cbor","text":"
    // (1)\ntemplate<typename InputType>\nstatic basic_json from_cbor(InputType&& i,\n                            const bool strict = true,\n                            const bool allow_exceptions = true,\n                            const cbor_tag_handler_t tag_handler = cbor_tag_handler_t::error);\n\n// (2)\ntemplate<typename IteratorType>\nstatic basic_json from_cbor(IteratorType first, IteratorType last,\n                            const bool strict = true,\n                            const bool allow_exceptions = true,\n                            const cbor_tag_handler_t tag_handler = cbor_tag_handler_t::error);\n

    Deserializes a given input to a JSON value using the CBOR (Concise Binary Object Representation) serialization format.

    1. Reads from a compatible input.
    2. Reads from an iterator range.

    The exact mapping and its limitations are described on a dedicated page.

    "},{"location":"api/basic_json/from_cbor/#template-parameters","title":"Template parameters","text":"InputType

    A compatible input, for instance:

    • an std::istream object
    • a FILE pointer
    • a C-style array of characters
    • a pointer to a null-terminated string of single byte characters
    • an object obj for which begin(obj) and end(obj) produces a valid pair of iterators.
    IteratorType a compatible iterator type"},{"location":"api/basic_json/from_cbor/#parameters","title":"Parameters","text":"i (in) an input in CBOR format convertible to an input adapter first (in) iterator to the start of the input last (in) iterator to the end of the input strict (in) whether to expect the input to be consumed until EOF (true by default) allow_exceptions (in) whether to throw exceptions in case of a parse error (optional, true by default) tag_handler (in) how to treat CBOR tags (optional, error by default); see cbor_tag_handler_t for more information"},{"location":"api/basic_json/from_cbor/#return-value","title":"Return value","text":"

    deserialized JSON value; in case of a parse error and allow_exceptions set to false, the return value will be value_t::discarded. The latter can be checked with is_discarded.

    "},{"location":"api/basic_json/from_cbor/#exception-safety","title":"Exception safety","text":"

    Strong guarantee: if an exception is thrown, there are no changes in the JSON value.

    "},{"location":"api/basic_json/from_cbor/#exceptions","title":"Exceptions","text":"
    • Throws parse_error.110 if the given input ends prematurely or the end of the file was not reached when strict was set to true
    • Throws parse_error.112 if unsupported features from CBOR were used in the given input or if the input is not valid CBOR
    • Throws parse_error.113 if a string was expected as a map key, but not found
    "},{"location":"api/basic_json/from_cbor/#complexity","title":"Complexity","text":"

    Linear in the size of the input.

    "},{"location":"api/basic_json/from_cbor/#examples","title":"Examples","text":"Example

    The example shows the deserialization of a byte vector in CBOR format to a JSON value.

    #include <iostream>\n#include <iomanip>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // create byte vector\n    std::vector<std::uint8_t> v = {0xa2, 0x67, 0x63, 0x6f, 0x6d, 0x70, 0x61, 0x63,\n                                   0x74, 0xf5, 0x66, 0x73, 0x63, 0x68, 0x65, 0x6d,\n                                   0x61, 0x00\n                                  };\n\n    // deserialize it with CBOR\n    json j = json::from_cbor(v);\n\n    // print the deserialized JSON value\n    std::cout << std::setw(2) << j << std::endl;\n}\n

    Output:

    {\n  \"compact\": true,\n  \"schema\": 0\n}\n
    "},{"location":"api/basic_json/from_cbor/#version-history","title":"Version history","text":"
    • Added in version 2.0.9.
    • Parameter start_index since version 2.1.1.
    • Changed to consume input adapters, removed start_index parameter, and added strict parameter in version 3.0.0.
    • Added allow_exceptions parameter in version 3.2.0.
    • Added tag_handler parameter in version 3.9.0.

    Deprecation

    • Overload (2) replaces calls to from_cbor with a pointer and a length as first two parameters, which has been deprecated in version 3.8.0. This overload will be removed in version 4.0.0. Please replace all calls like from_cbor(ptr, len, ...); with from_cbor(ptr, ptr+len, ...);.
    • Overload (2) replaces calls to from_cbor with a pair of iterators as their first parameter, which has been deprecated in version 3.8.0. This overload will be removed in version 4.0.0. Please replace all calls like from_cbor({ptr, ptr+len}, ...); with from_cbor(ptr, ptr+len, ...);.

    You should be warned by your compiler with a -Wdeprecated-declarations warning if you are using a deprecated function.

    "},{"location":"api/basic_json/from_msgpack/","title":"nlohmann::basic_json::from_msgpack","text":"
    // (1)\ntemplate<typename InputType>\nstatic basic_json from_msgpack(InputType&& i,\n                               const bool strict = true,\n                               const bool allow_exceptions = true);\n// (2)\ntemplate<typename IteratorType>\nstatic basic_json from_msgpack(IteratorType first, IteratorType last,\n                               const bool strict = true,\n                               const bool allow_exceptions = true);\n

    Deserializes a given input to a JSON value using the MessagePack serialization format.

    1. Reads from a compatible input.
    2. Reads from an iterator range.

    The exact mapping and its limitations are described on a dedicated page.

    "},{"location":"api/basic_json/from_msgpack/#template-parameters","title":"Template parameters","text":"InputType

    A compatible input, for instance:

    • an std::istream object
    • a FILE pointer
    • a C-style array of characters
    • a pointer to a null-terminated string of single byte characters
    • an object obj for which begin(obj) and end(obj) produces a valid pair of iterators.
    IteratorType a compatible iterator type"},{"location":"api/basic_json/from_msgpack/#parameters","title":"Parameters","text":"i (in) an input in MessagePack format convertible to an input adapter first (in) iterator to the start of the input last (in) iterator to the end of the input strict (in) whether to expect the input to be consumed until EOF (true by default) allow_exceptions (in) whether to throw exceptions in case of a parse error (optional, true by default)"},{"location":"api/basic_json/from_msgpack/#return-value","title":"Return value","text":"

    deserialized JSON value; in case of a parse error and allow_exceptions set to false, the return value will be value_t::discarded. The latter can be checked with is_discarded.

    "},{"location":"api/basic_json/from_msgpack/#exception-safety","title":"Exception safety","text":"

    Strong guarantee: if an exception is thrown, there are no changes in the JSON value.

    "},{"location":"api/basic_json/from_msgpack/#exceptions","title":"Exceptions","text":"
    • Throws parse_error.110 if the given input ends prematurely or the end of the file was not reached when strict was set to true
    • Throws parse_error.112 if unsupported features from MessagePack were used in the given input or if the input is not valid MessagePack
    • Throws parse_error.113 if a string was expected as a map key, but not found
    "},{"location":"api/basic_json/from_msgpack/#complexity","title":"Complexity","text":"

    Linear in the size of the input.

    "},{"location":"api/basic_json/from_msgpack/#examples","title":"Examples","text":"Example

    The example shows the deserialization of a byte vector in MessagePack format to a JSON value.

    #include <iostream>\n#include <iomanip>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // create byte vector\n    std::vector<std::uint8_t> v = {0x82, 0xa7, 0x63, 0x6f, 0x6d, 0x70, 0x61, 0x63,\n                                   0x74, 0xc3, 0xa6, 0x73, 0x63, 0x68, 0x65, 0x6d,\n                                   0x61, 0x00\n                                  };\n\n    // deserialize it with MessagePack\n    json j = json::from_msgpack(v);\n\n    // print the deserialized JSON value\n    std::cout << std::setw(2) << j << std::endl;\n}\n

    Output:

    {\n  \"compact\": true,\n  \"schema\": 0\n}\n
    "},{"location":"api/basic_json/from_msgpack/#version-history","title":"Version history","text":"
    • Added in version 2.0.9.
    • Parameter start_index since version 2.1.1.
    • Changed to consume input adapters, removed start_index parameter, and added strict parameter in version 3.0.0.
    • Added allow_exceptions parameter in version 3.2.0.

    Deprecation

    • Overload (2) replaces calls to from_msgpack with a pointer and a length as first two parameters, which has been deprecated in version 3.8.0. This overload will be removed in version 4.0.0. Please replace all calls like from_msgpack(ptr, len, ...); with from_msgpack(ptr, ptr+len, ...);.
    • Overload (2) replaces calls to from_cbor with a pair of iterators as their first parameter, which has been deprecated in version 3.8.0. This overload will be removed in version 4.0.0. Please replace all calls like from_msgpack({ptr, ptr+len}, ...); with from_msgpack(ptr, ptr+len, ...);.

    You should be warned by your compiler with a -Wdeprecated-declarations warning if you are using a deprecated function.

    "},{"location":"api/basic_json/from_ubjson/","title":"nlohmann::basic_json::from_ubjson","text":"
    // (1)\ntemplate<typename InputType>\nstatic basic_json from_ubjson(InputType&& i,\n                              const bool strict = true,\n                              const bool allow_exceptions = true);\n// (2)\ntemplate<typename IteratorType>\nstatic basic_json from_ubjson(IteratorType first, IteratorType last,\n                              const bool strict = true,\n                              const bool allow_exceptions = true);\n

    Deserializes a given input to a JSON value using the UBJSON (Universal Binary JSON) serialization format.

    1. Reads from a compatible input.
    2. Reads from an iterator range.

    The exact mapping and its limitations are described on a dedicated page.

    "},{"location":"api/basic_json/from_ubjson/#template-parameters","title":"Template parameters","text":"InputType

    A compatible input, for instance:

    • an std::istream object
    • a FILE pointer
    • a C-style array of characters
    • a pointer to a null-terminated string of single byte characters
    • an object obj for which begin(obj) and end(obj) produces a valid pair of iterators.
    IteratorType a compatible iterator type"},{"location":"api/basic_json/from_ubjson/#parameters","title":"Parameters","text":"i (in) an input in UBJSON format convertible to an input adapter first (in) iterator to the start of the input last (in) iterator to the end of the input strict (in) whether to expect the input to be consumed until EOF (true by default) allow_exceptions (in) whether to throw exceptions in case of a parse error (optional, true by default)"},{"location":"api/basic_json/from_ubjson/#return-value","title":"Return value","text":"

    deserialized JSON value; in case of a parse error and allow_exceptions set to false, the return value will be value_t::discarded. The latter can be checked with is_discarded.

    "},{"location":"api/basic_json/from_ubjson/#exception-safety","title":"Exception safety","text":"

    Strong guarantee: if an exception is thrown, there are no changes in the JSON value.

    "},{"location":"api/basic_json/from_ubjson/#exceptions","title":"Exceptions","text":"
    • Throws parse_error.110 if the given input ends prematurely or the end of the file was not reached when strict was set to true
    • Throws parse_error.112 if a parse error occurs
    • Throws parse_error.113 if a string could not be parsed successfully
    "},{"location":"api/basic_json/from_ubjson/#complexity","title":"Complexity","text":"

    Linear in the size of the input.

    "},{"location":"api/basic_json/from_ubjson/#examples","title":"Examples","text":"Example

    The example shows the deserialization of a byte vector in UBJSON format to a JSON value.

    #include <iostream>\n#include <iomanip>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // create byte vector\n    std::vector<std::uint8_t> v = {0x7B, 0x69, 0x07, 0x63, 0x6F, 0x6D, 0x70, 0x61,\n                                   0x63, 0x74, 0x54, 0x69, 0x06, 0x73, 0x63, 0x68,\n                                   0x65, 0x6D, 0x61, 0x69, 0x00, 0x7D\n                                  };\n\n    // deserialize it with UBJSON\n    json j = json::from_ubjson(v);\n\n    // print the deserialized JSON value\n    std::cout << std::setw(2) << j << std::endl;\n}\n

    Output:

    {\n  \"compact\": true,\n  \"schema\": 0\n}\n
    "},{"location":"api/basic_json/from_ubjson/#version-history","title":"Version history","text":"
    • Added in version 3.1.0.
    • Added allow_exceptions parameter in version 3.2.0.

    Deprecation

    • Overload (2) replaces calls to from_ubjson with a pointer and a length as first two parameters, which has been deprecated in version 3.8.0. This overload will be removed in version 4.0.0. Please replace all calls like from_ubjson(ptr, len, ...); with from_ubjson(ptr, ptr+len, ...);.
    • Overload (2) replaces calls to from_ubjson with a pair of iterators as their first parameter, which has been deprecated in version 3.8.0. This overload will be removed in version 4.0.0. Please replace all calls like from_ubjson({ptr, ptr+len}, ...); with from_ubjson(ptr, ptr+len, ...);.

    You should be warned by your compiler with a -Wdeprecated-declarations warning if you are using a deprecated function.

    "},{"location":"api/basic_json/front/","title":"nlohmann::basic_json::front","text":"
    reference front();\nconst_reference front() const;\n

    Returns a reference to the first element in the container. For a JSON container c, the expression c.front() is equivalent to *c.begin().

    "},{"location":"api/basic_json/front/#return-value","title":"Return value","text":"

    In the case of a structured type (array or object), a reference to the first element is returned. In the case of number, string, boolean, or binary values, a reference to the value is returned.

    "},{"location":"api/basic_json/front/#exception-safety","title":"Exception safety","text":"

    Strong guarantee: if an exception is thrown, there are no changes in the JSON value.

    "},{"location":"api/basic_json/front/#exceptions","title":"Exceptions","text":"

    If the JSON value is null, exception invalid_iterator.214 is thrown.

    "},{"location":"api/basic_json/front/#complexity","title":"Complexity","text":"

    Constant.

    "},{"location":"api/basic_json/front/#notes","title":"Notes","text":"

    Precondition

    The array or object must not be empty. Calling front on an empty array or object yields undefined behavior.

    "},{"location":"api/basic_json/front/#examples","title":"Examples","text":"Example

    The following code shows an example for front().

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // create JSON values\n    json j_null;\n    json j_boolean = true;\n    json j_number_integer = 17;\n    json j_number_float = 23.42;\n    json j_object = {{\"one\", 1}, {\"two\", 2}};\n    json j_object_empty(json::value_t::object);\n    json j_array = {1, 2, 4, 8, 16};\n    json j_array_empty(json::value_t::array);\n    json j_string = \"Hello, world\";\n\n    // call front()\n    //std::cout << j_null.front() << '\\n';          // would throw\n    std::cout << j_boolean.front() << '\\n';\n    std::cout << j_number_integer.front() << '\\n';\n    std::cout << j_number_float.front() << '\\n';\n    std::cout << j_object.front() << '\\n';\n    //std::cout << j_object_empty.front() << '\\n';  // undefined behavior\n    std::cout << j_array.front() << '\\n';\n    //std::cout << j_array_empty.front() << '\\n';   // undefined behavior\n    std::cout << j_string.front() << '\\n';\n}\n

    Output:

    true\n17\n23.42\n1\n1\n\"Hello, world\"\n
    "},{"location":"api/basic_json/front/#see-also","title":"See also","text":"
    • back to access the last element
    "},{"location":"api/basic_json/front/#version-history","title":"Version history","text":"
    • Added in version 1.0.0.
    • Adjusted code to return reference to binary values in version 3.8.0.
    "},{"location":"api/basic_json/get/","title":"nlohmann::basic_json::get","text":"
    // (1)\ntemplate<typename ValueType>\nValueType get() const noexcept(\n    noexcept(JSONSerializer<ValueType>::from_json(\n        std::declval<const basic_json_t&>(), std::declval<ValueType&>())));\n\n// (2)\ntemplate<typename BasicJsonType>\nBasicJsonType get() const;\n\n// (3)\ntemplate<typename PointerType>\nPointerType get_ptr();\n\ntemplate<typename PointerType>\nconstexpr const PointerType get_ptr() const noexcept;\n

    1. Explicit type conversion between the JSON value and a compatible value which is CopyConstructible and DefaultConstructible. The value is converted by calling the json_serializer<ValueType> from_json() method.

      The function is equivalent to executing 

      ValueType ret;\nJSONSerializer<ValueType>::from_json(*this, ret);\nreturn ret;\n

      This overload is chosen if:

      • ValueType is not basic_json,
      • json_serializer<ValueType> has a from_json() method of the form void from_json(const basic_json&, ValueType&), and
      • json_serializer<ValueType> does not have a from_json() method of the form ValueType from_json(const basic_json&)

      If the type is not CopyConstructible and not DefaultConstructible, the value is converted by calling the json_serializer<ValueType> from_json() method.

      The function is then equivalent to executing 

      return JSONSerializer<ValueTypeCV>::from_json(*this);\n

      This overload is chosen if:

      • ValueType is not basic_json and
      • json_serializer<ValueType> has a from_json() method of the form ValueType from_json(const basic_json&)

      If json_serializer<ValueType> has both overloads of from_json(), the latter one is chosen.

    2. Overload for basic_json specializations. The function is equivalent to executing 

      return *this;\n

    3. Explicit pointer access to the internally stored JSON value. No copies are made.

    "},{"location":"api/basic_json/get/#template-parameters","title":"Template parameters","text":"ValueType the value type to return BasicJsonType a specialization of basic_json PointerType pointer type; must be a pointer to array_t, object_t, string_t, boolean_t, number_integer_t, or number_unsigned_t, number_float_t, or binary_t. Other types will not compile."},{"location":"api/basic_json/get/#return-value","title":"Return value","text":"
    1. copy of the JSON value, converted to ValueType
    2. a copy of *this, converted into BasicJsonType
    3. pointer to the internally stored JSON value if the requested pointer type fits to the JSON value; nullptr otherwise
    "},{"location":"api/basic_json/get/#exceptions","title":"Exceptions","text":"

    Depends on what json_serializer<ValueType> from_json() method throws

    "},{"location":"api/basic_json/get/#notes","title":"Notes","text":"

    Undefined behavior

    Writing data to the pointee (overload 3) of the result yields an undefined state.

    "},{"location":"api/basic_json/get/#examples","title":"Examples","text":"Example

    The example below shows several conversions from JSON values to other types. There a few things to note: (1) Floating-point numbers can be converted to integers, (2) A JSON array can be converted to a standard std::vector<short>, (3) A JSON object can be converted to C++ associative containers such as std::unordered_map<std::string, json>.

    #include <iostream>\n#include <unordered_map>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // create a JSON value with different types\n    json json_types =\n    {\n        {\"boolean\", true},\n        {\n            \"number\", {\n                {\"integer\", 42},\n                {\"floating-point\", 17.23}\n            }\n        },\n        {\"string\", \"Hello, world!\"},\n        {\"array\", {1, 2, 3, 4, 5}},\n        {\"null\", nullptr}\n    };\n\n    // use explicit conversions\n    auto v1 = json_types[\"boolean\"].template get<bool>();\n    auto v2 = json_types[\"number\"][\"integer\"].template get<int>();\n    auto v3 = json_types[\"number\"][\"integer\"].template get<short>();\n    auto v4 = json_types[\"number\"][\"floating-point\"].template get<float>();\n    auto v5 = json_types[\"number\"][\"floating-point\"].template get<int>();\n    auto v6 = json_types[\"string\"].template get<std::string>();\n    auto v7 = json_types[\"array\"].template get<std::vector<short>>();\n    auto v8 = json_types.template get<std::unordered_map<std::string, json>>();\n\n    // print the conversion results\n    std::cout << v1 << '\\n';\n    std::cout << v2 << ' ' << v3 << '\\n';\n    std::cout << v4 << ' ' << v5 << '\\n';\n    std::cout << v6 << '\\n';\n\n    for (auto i : v7)\n    {\n        std::cout << i << ' ';\n    }\n    std::cout << \"\\n\\n\";\n\n    for (auto i : v8)\n    {\n        std::cout << i.first << \": \" << i.second << '\\n';\n    }\n}\n

    Output:

    1\n42 42\n17.23 17\nHello, world!\n1 2 3 4 5 \n\nstring: \"Hello, world!\"\nnumber: {\"floating-point\":17.23,\"integer\":42}\nnull: null\nboolean: true\narray: [1,2,3,4,5]\n
    Example

    The example below shows how pointers to internal values of a JSON value can be requested. Note that no type conversions are made and a #cpp nullptr is returned if the value and the requested pointer type does not match.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // create a JSON number\n    json value = 17;\n\n    // explicitly getting pointers\n    auto p1 = value.template get<const json::number_integer_t*>();\n    auto p2 = value.template get<json::number_integer_t*>();\n    auto p3 = value.template get<json::number_integer_t* const>();\n    auto p4 = value.template get<const json::number_integer_t* const>();\n    auto p5 = value.template get<json::number_float_t*>();\n\n    // print the pointees\n    std::cout << *p1 << ' ' << *p2 << ' ' << *p3 << ' ' << *p4 << '\\n';\n    std::cout << std::boolalpha << (p5 == nullptr) << '\\n';\n}\n

    Output:

    17 17 17 17\ntrue\n
    "},{"location":"api/basic_json/get/#version-history","title":"Version history","text":"
    1. Since version 2.1.0.
    2. Since version 2.1.0. Extended to work with other specializations of basic_json in version 3.2.0.
    3. Since version 1.0.0.
    "},{"location":"api/basic_json/get_allocator/","title":"nlohmann::basic_json::get_allocator","text":"
    static allocator_type get_allocator();\n

    Returns the allocator associated with the container.

    "},{"location":"api/basic_json/get_allocator/#return-value","title":"Return value","text":"

    associated allocator

    "},{"location":"api/basic_json/get_allocator/#examples","title":"Examples","text":"Example

    The example shows how get_allocator() is used to created json values.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    auto alloc = json::get_allocator();\n    using traits_t = std::allocator_traits<decltype(alloc)>;\n\n    json* j = traits_t::allocate(alloc, 1);\n    traits_t::construct(alloc, j, \"Hello, world!\");\n\n    std::cout << *j << std::endl;\n\n    traits_t::destroy(alloc, j);\n    traits_t::deallocate(alloc, j, 1);\n}\n

    Output:

    \"Hello, world!\"\n
    "},{"location":"api/basic_json/get_allocator/#version-history","title":"Version history","text":"
    • Added in version 1.0.0.
    "},{"location":"api/basic_json/get_binary/","title":"nlohmann::basic_json::get_binary","text":"
    binary_t& get_binary();\n\nconst binary_t& get_binary() const;\n

    Returns a reference to the stored binary value.

    "},{"location":"api/basic_json/get_binary/#return-value","title":"Return value","text":"

    Reference to binary value.

    "},{"location":"api/basic_json/get_binary/#exception-safety","title":"Exception safety","text":"

    Strong exception safety: if an exception occurs, the original value stays intact.

    "},{"location":"api/basic_json/get_binary/#exceptions","title":"Exceptions","text":"

    Throws type_error.302 if the value is not binary

    "},{"location":"api/basic_json/get_binary/#complexity","title":"Complexity","text":"

    Constant.

    "},{"location":"api/basic_json/get_binary/#examples","title":"Examples","text":"Example

    The following code shows how to query a binary value.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // create a binary vector\n    std::vector<std::uint8_t> vec = {0xCA, 0xFE, 0xBA, 0xBE};\n\n    // create a binary JSON value with subtype 42\n    json j = json::binary(vec, 42);\n\n    // output type and subtype\n    std::cout << \"type: \" << j.type_name() << \", subtype: \" << j.get_binary().subtype() << std::endl;\n}\n

    Output:

    type: binary, subtype: 42\n
    "},{"location":"api/basic_json/get_binary/#version-history","title":"Version history","text":"
    • Added in version 3.8.0.
    "},{"location":"api/basic_json/get_ptr/","title":"nlohmann::basic_json::get_ptr","text":"
    template<typename PointerType>\nPointerType get_ptr() noexcept;\n\ntemplate<typename PointerType>\nconstexpr const PointerType get_ptr() const noexcept;\n

    Implicit pointer access to the internally stored JSON value. No copies are made.

    "},{"location":"api/basic_json/get_ptr/#template-parameters","title":"Template parameters","text":"PointerType pointer type; must be a pointer to array_t, object_t, string_t, boolean_t, number_integer_t, or number_unsigned_t, number_float_t, or binary_t. Other types will not compile."},{"location":"api/basic_json/get_ptr/#return-value","title":"Return value","text":"

    pointer to the internally stored JSON value if the requested pointer type fits to the JSON value; nullptr otherwise

    "},{"location":"api/basic_json/get_ptr/#exception-safety","title":"Exception safety","text":"

    No-throw guarantee: this function never throws exceptions.

    "},{"location":"api/basic_json/get_ptr/#complexity","title":"Complexity","text":"

    Constant.

    "},{"location":"api/basic_json/get_ptr/#notes","title":"Notes","text":"

    Undefined behavior

    The pointer becomes invalid if the underlying JSON object changes.

    Consider the following example code where the pointer ptr changes after the array is resized. As a result, reading or writing to ptr after the array change would be undefined behavior. The address of the first array element changes, because the underlying std::vector is resized after adding a fifth element.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    json j = {1, 2, 3, 4};\n    auto* ptr = j[0].get_ptr<std::int64_t*>();\n    std::cout << \"value at \" << ptr << \" is \" << *ptr << std::endl;\n\n    j.push_back(5);\n\n    ptr = j[0].get_ptr<std::int64_t*>();\n    std::cout << \"value at \" << ptr << \" is \" << *ptr << std::endl;\n}\n

    Output:

    value at 0x6000012fc1c8 is 1\nvalue at 0x6000029fc088 is 1\n
    "},{"location":"api/basic_json/get_ptr/#examples","title":"Examples","text":"Example

    The example below shows how pointers to internal values of a JSON value can be requested. Note that no type conversions are made and a nullptr is returned if the value and the requested pointer type does not match.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // create a JSON number\n    json value = 17;\n\n    // explicitly getting pointers\n    auto p1 = value.get_ptr<const json::number_integer_t*>();\n    auto p2 = value.get_ptr<json::number_integer_t*>();\n    auto p3 = value.get_ptr<json::number_integer_t* const>();\n    auto p4 = value.get_ptr<const json::number_integer_t* const>();\n    auto p5 = value.get_ptr<json::number_float_t*>();\n\n    // print the pointees\n    std::cout << *p1 << ' ' << *p2 << ' ' << *p3 << ' ' << *p4 << '\\n';\n    std::cout << std::boolalpha << (p5 == nullptr) << '\\n';\n}\n

    Output:

    17 17 17 17\ntrue\n
    "},{"location":"api/basic_json/get_ptr/#see-also","title":"See also","text":"
    • get_ref() get a reference value
    "},{"location":"api/basic_json/get_ptr/#version-history","title":"Version history","text":"
    • Added in version 1.0.0.
    • Extended to binary types in version 3.8.0.
    "},{"location":"api/basic_json/get_ref/","title":"nlohmann::basic_json::get_ref","text":"
    template<typename ReferenceType>\nReferenceType get_ref();\n\ntemplate<typename ReferenceType>\nconst ReferenceType get_ref() const;\n

    Implicit reference access to the internally stored JSON value. No copies are made.

    "},{"location":"api/basic_json/get_ref/#template-parameters","title":"Template parameters","text":"ReferenceType reference type; must be a reference to array_t, object_t, string_t, boolean_t, number_integer_t, or number_unsigned_t, number_float_t, or binary_t. Enforced by a static assertion."},{"location":"api/basic_json/get_ref/#return-value","title":"Return value","text":"

    reference to the internally stored JSON value if the requested reference type fits to the JSON value; throws type_error.303 otherwise

    "},{"location":"api/basic_json/get_ref/#exception-safety","title":"Exception safety","text":"

    Strong exception safety: if an exception occurs, the original value stays intact.

    "},{"location":"api/basic_json/get_ref/#exceptions","title":"Exceptions","text":"

    Throws type_error.303 if the requested reference type does not match the stored JSON value type; example: \"incompatible ReferenceType for get_ref, actual type is binary\".

    "},{"location":"api/basic_json/get_ref/#complexity","title":"Complexity","text":"

    Constant.

    "},{"location":"api/basic_json/get_ref/#notes","title":"Notes","text":"

    Undefined behavior

    The reference becomes invalid if the underlying JSON object changes.

    "},{"location":"api/basic_json/get_ref/#examples","title":"Examples","text":"Example

    The example shows several calls to get_ref().

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // create a JSON number\n    json value = 17;\n\n    // explicitly getting references\n    auto r1 = value.get_ref<const json::number_integer_t&>();\n    auto r2 = value.get_ref<json::number_integer_t&>();\n\n    // print the values\n    std::cout << r1 << ' ' << r2 << '\\n';\n\n    // incompatible type throws exception\n    try\n    {\n        auto r3 = value.get_ref<json::number_float_t&>();\n    }\n    catch (const json::type_error& ex)\n    {\n        std::cout << ex.what() << '\\n';\n    }\n}\n

    Output:

    17 17\n[json.exception.type_error.303] incompatible ReferenceType for get_ref, actual type is number\n
    "},{"location":"api/basic_json/get_ref/#see-also","title":"See also","text":"
    • get_ptr() get a pointer value
    "},{"location":"api/basic_json/get_ref/#version-history","title":"Version history","text":"
    • Added in version 1.1.0.
    • Extended to binary types in version 3.8.0.
    "},{"location":"api/basic_json/get_to/","title":"nlohmann::basic_json::get_to","text":"
    template<typename ValueType>\nValueType& get_to(ValueType& v) const noexcept(\n    noexcept(JSONSerializer<ValueType>::from_json(\n        std::declval<const basic_json_t&>(), v)));\n

    Explicit type conversion between the JSON value and a compatible value. The value is filled into the input parameter by calling the json_serializer<ValueType> from_json() method.

    The function is equivalent to executing 

    ValueType v;\nJSONSerializer<ValueType>::from_json(*this, v);\n

    This overload is chosen if:

    • ValueType is not basic_json,
    • json_serializer<ValueType> has a from_json() method of the form void from_json(const basic_json&, ValueType&)
    "},{"location":"api/basic_json/get_to/#template-parameters","title":"Template parameters","text":"ValueType the value type to return"},{"location":"api/basic_json/get_to/#return-value","title":"Return value","text":"

    the input parameter, allowing chaining calls

    "},{"location":"api/basic_json/get_to/#exceptions","title":"Exceptions","text":"

    Depends on what json_serializer<ValueType> from_json() method throws

    "},{"location":"api/basic_json/get_to/#examples","title":"Examples","text":"Example

    The example below shows several conversions from JSON values to other types. There a few things to note: (1) Floating-point numbers can be converted to integers, (2) A JSON array can be converted to a standard std::vector<short>, (3) A JSON object can be converted to C++ associative containers such as #cpp std::unordered_map<std::string, json>.

    #include <iostream>\n#include <unordered_map>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // create a JSON value with different types\n    json json_types =\n    {\n        {\"boolean\", true},\n        {\n            \"number\", {\n                {\"integer\", 42},\n                {\"floating-point\", 17.23}\n            }\n        },\n        {\"string\", \"Hello, world!\"},\n        {\"array\", {1, 2, 3, 4, 5}},\n        {\"null\", nullptr}\n    };\n\n    bool v1;\n    int v2;\n    short v3;\n    float v4;\n    int v5;\n    std::string v6;\n    std::vector<short> v7;\n    std::unordered_map<std::string, json> v8;\n\n    // use explicit conversions\n    json_types[\"boolean\"].get_to(v1);\n    json_types[\"number\"][\"integer\"].get_to(v2);\n    json_types[\"number\"][\"integer\"].get_to(v3);\n    json_types[\"number\"][\"floating-point\"].get_to(v4);\n    json_types[\"number\"][\"floating-point\"].get_to(v5);\n    json_types[\"string\"].get_to(v6);\n    json_types[\"array\"].get_to(v7);\n    json_types.get_to(v8);\n\n    // print the conversion results\n    std::cout << v1 << '\\n';\n    std::cout << v2 << ' ' << v3 << '\\n';\n    std::cout << v4 << ' ' << v5 << '\\n';\n    std::cout << v6 << '\\n';\n\n    for (auto i : v7)\n    {\n        std::cout << i << ' ';\n    }\n    std::cout << \"\\n\\n\";\n\n    for (auto i : v8)\n    {\n        std::cout << i.first << \": \" << i.second << '\\n';\n    }\n}\n

    Output:

    1\n42 42\n17.23 17\nHello, world!\n1 2 3 4 5 \n\nstring: \"Hello, world!\"\nnumber: {\"floating-point\":17.23,\"integer\":42}\nnull: null\nboolean: true\narray: [1,2,3,4,5]\n
    "},{"location":"api/basic_json/get_to/#version-history","title":"Version history","text":"
    • Since version 3.3.0.
    "},{"location":"api/basic_json/input_format_t/","title":"nlohmann::basic_json::input_format_t","text":"
    enum class input_format_t {\n    json,\n    cbor,\n    msgpack,\n    ubjson,\n    bson,\n    bjdata\n};\n

    This enumeration is used in the sax_parse function to choose the input format to parse:

    json JSON (JavaScript Object Notation) cbor CBOR (Concise Binary Object Representation) msgpack MessagePack ubjson UBJSON (Universal Binary JSON) bson BSON (Binary JSON) bjdata BJData (Binary JData)"},{"location":"api/basic_json/input_format_t/#examples","title":"Examples","text":"Example

    The example below shows how an input_format_t enum value is passed to sax_parse to set the input format to CBOR.

    #include <iostream>\n#include <iomanip>\n#include <sstream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\n// a simple event consumer that collects string representations of the passed\n// values; note inheriting from json::json_sax_t is not required, but can\n// help not to forget a required function\nclass sax_event_consumer : public json::json_sax_t\n{\n  public:\n    std::vector<std::string> events;\n\n    bool null() override\n    {\n        events.push_back(\"null()\");\n        return true;\n    }\n\n    bool boolean(bool val) override\n    {\n        events.push_back(\"boolean(val=\" + std::string(val ? \"true\" : \"false\") + \")\");\n        return true;\n    }\n\n    bool number_integer(number_integer_t val) override\n    {\n        events.push_back(\"number_integer(val=\" + std::to_string(val) + \")\");\n        return true;\n    }\n\n    bool number_unsigned(number_unsigned_t val) override\n    {\n        events.push_back(\"number_unsigned(val=\" + std::to_string(val) + \")\");\n        return true;\n    }\n\n    bool number_float(number_float_t val, const string_t& s) override\n    {\n        events.push_back(\"number_float(val=\" + std::to_string(val) + \", s=\" + s + \")\");\n        return true;\n    }\n\n    bool string(string_t& val) override\n    {\n        events.push_back(\"string(val=\" + val + \")\");\n        return true;\n    }\n\n    bool start_object(std::size_t elements) override\n    {\n        events.push_back(\"start_object(elements=\" + std::to_string(elements) + \")\");\n        return true;\n    }\n\n    bool end_object() override\n    {\n        events.push_back(\"end_object()\");\n        return true;\n    }\n\n    bool start_array(std::size_t elements) override\n    {\n        events.push_back(\"start_array(elements=\" + std::to_string(elements) + \")\");\n        return true;\n    }\n\n    bool end_array() override\n    {\n        events.push_back(\"end_array()\");\n        return true;\n    }\n\n    bool key(string_t& val) override\n    {\n        events.push_back(\"key(val=\" + val + \")\");\n        return true;\n    }\n\n    bool binary(json::binary_t& val) override\n    {\n        events.push_back(\"binary(val=[...])\");\n        return true;\n    }\n\n    bool parse_error(std::size_t position, const std::string& last_token, const json::exception& ex) override\n    {\n        events.push_back(\"parse_error(position=\" + std::to_string(position) + \", last_token=\" + last_token + \",\\n            ex=\" + std::string(ex.what()) + \")\");\n        return false;\n    }\n};\n\nint main()\n{\n    // CBOR byte string\n    std::vector<std::uint8_t> vec = {{0x44, 0xcA, 0xfe, 0xba, 0xbe}};\n\n    // create a SAX event consumer object\n    sax_event_consumer sec;\n\n    // parse CBOR\n    bool result = json::sax_parse(vec, &sec, json::input_format_t::cbor);\n\n    // output the recorded events\n    for (auto& event : sec.events)\n    {\n        std::cout << event << \"\\n\";\n    }\n\n    // output the result of sax_parse\n    std::cout << \"\\nresult: \" << std::boolalpha << result << std::endl;\n}\n

    Output:

    binary(val=[...])\n\nresult: true\n
    "},{"location":"api/basic_json/input_format_t/#version-history","title":"Version history","text":"
    • Added in version 3.2.0.
    "},{"location":"api/basic_json/insert/","title":"nlohmann::basic_json::insert","text":"
    // (1)\niterator insert(const_iterator pos, const basic_json& val);\niterator insert(const_iterator pos, basic_json&& val);\n\n// (2)\niterator insert(const_iterator pos, size_type cnt, const basic_json& val);\n\n// (3)\niterator insert(const_iterator pos, const_iterator first, const_iterator last);\n\n// (4)\niterator insert(const_iterator pos, initializer_list_t ilist);\n\n// (5)\nvoid insert(const_iterator first, const_iterator last);\n
    1. Inserts element val into an array before iterator pos.
    2. Inserts cnt copies of val into an array before iterator pos.
    3. Inserts elements from range [first, last) into an array before iterator pos.
    4. Inserts elements from initializer list ilist into an array before iterator pos.
    5. Inserts elements from range [first, last) into an object.
    "},{"location":"api/basic_json/insert/#iterator-invalidation","title":"Iterator invalidation","text":"

    For all cases where an element is added to an array, a reallocation can happen, in which case all iterators (including the end() iterator) and all references to the elements are invalidated. Otherwise, only the end() iterator is invalidated. Also, any iterator or reference after the insertion point will point to the same index, which is now a different value.

    For ordered_json, also adding an element to an object can yield a reallocation which again invalidates all iterators and all references. Also, any iterator or reference after the insertion point will point to the same index, which is now a different value.

    "},{"location":"api/basic_json/insert/#parameters","title":"Parameters","text":"pos (in) iterator before which the content will be inserted; may be the end() iterator val (in) value to insert cnt (in) number of copies of val to insert first (in) the start of the range of elements to insert last (in) the end of the range of elements to insert ilist (in) initializer list to insert the values from"},{"location":"api/basic_json/insert/#return-value","title":"Return value","text":"
    1. iterator pointing to the inserted val.
    2. iterator pointing to the first element inserted, or pos if cnt==0
    3. iterator pointing to the first element inserted, or pos if first==last
    4. iterator pointing to the first element inserted, or pos if ilist is empty
    5. (none)
    "},{"location":"api/basic_json/insert/#exception-safety","title":"Exception safety","text":"

    Strong exception safety: if an exception occurs, the original value stays intact.

    "},{"location":"api/basic_json/insert/#exceptions","title":"Exceptions","text":"
    1. The function can throw the following exceptions:
      • Throws type_error.309 if called on JSON values other than arrays; example: \"cannot use insert() with string\"
      • Throws invalid_iterator.202 if called on an iterator which does not belong to the current JSON value; example: \"iterator does not fit current value\"
    2. The function can throw the following exceptions:
      • Throws type_error.309 if called on JSON values other than arrays; example: \"cannot use insert() with string\"
      • Throws invalid_iterator.202 if called on an iterator which does not belong to the current JSON value; example: \"iterator does not fit current value\"
    3. The function can throw the following exceptions:
      • Throws type_error.309 if called on JSON values other than arrays; example: \"cannot use insert() with string\"
      • Throws invalid_iterator.202 if called on an iterator which does not belong to the current JSON value; example: \"iterator does not fit current value\"
      • Throws invalid_iterator.210 if first and last do not belong to the same JSON value; example: \"iterators do not fit\"
      • Throws invalid_iterator.211 if first or last are iterators into container for which insert is called; example: \"passed iterators may not belong to container\"
    4. The function can throw the following exceptions:
      • Throws type_error.309 if called on JSON values other than arrays; example: \"cannot use insert() with string\"
      • Throws invalid_iterator.202 if called on an iterator which does not belong to the current JSON value; example: \"iterator does not fit current value\"
    5. The function can throw the following exceptions:
      • Throws type_error.309 if called on JSON values other than objects; example: \"cannot use insert() with string\"
      • Throws invalid_iterator.202 if called on an iterator which does not belong to the current JSON value; example: \"iterator does not fit current value\"
      • Throws invalid_iterator.210 if first and last do not belong to the same JSON value; example: \"iterators do not fit\"
    "},{"location":"api/basic_json/insert/#complexity","title":"Complexity","text":"
    1. Constant plus linear in the distance between pos and end of the container.
    2. Linear in cnt plus linear in the distance between pos and end of the container.
    3. Linear in std::distance(first, last) plus linear in the distance between pos and end of the container.
    4. Linear in ilist.size() plus linear in the distance between pos and end of the container.
    5. Logarithmic: O(N*log(size() + N)), where N is the number of elements to insert.
    "},{"location":"api/basic_json/insert/#examples","title":"Examples","text":"Example (1): insert element into array

    The example shows how insert() is used.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // create a JSON array\n    json v = {1, 2, 3, 4};\n\n    // insert number 10 before number 3\n    auto new_pos = v.insert(v.begin() + 2, 10);\n\n    // output new array and result of insert call\n    std::cout << *new_pos << '\\n';\n    std::cout << v << '\\n';\n}\n

    Output:

    10\n[1,2,10,3,4]\n
    Example (2): insert copies of element into array

    The example shows how insert() is used.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // create a JSON array\n    json v = {1, 2, 3, 4};\n\n    // insert number 7 copies of number 7 before number 3\n    auto new_pos = v.insert(v.begin() + 2, 7, 7);\n\n    // output new array and result of insert call\n    std::cout << *new_pos << '\\n';\n    std::cout << v << '\\n';\n}\n

    Output:

    7\n[1,2,7,7,7,7,7,7,7,3,4]\n
    Example (3): insert a range of elements into an array

    The example shows how insert() is used.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // create a JSON array\n    json v = {1, 2, 3, 4};\n\n    // create a JSON array to copy values from\n    json v2 = {\"one\", \"two\", \"three\", \"four\"};\n\n    // insert range from v2 before the end of array v\n    auto new_pos = v.insert(v.end(), v2.begin(), v2.end());\n\n    // output new array and result of insert call\n    std::cout << *new_pos << '\\n';\n    std::cout << v << '\\n';\n}\n

    Output:

    \"one\"\n[1,2,3,4,\"one\",\"two\",\"three\",\"four\"]\n
    Example (4): insert elements from an initializer list into an array

    The example shows how insert() is used.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // create a JSON array\n    json v = {1, 2, 3, 4};\n\n    // insert range from v2 before the end of array v\n    auto new_pos = v.insert(v.end(), {7, 8, 9});\n\n    // output new array and result of insert call\n    std::cout << *new_pos << '\\n';\n    std::cout << v << '\\n';\n}\n

    Output:

    7\n[1,2,3,4,7,8,9]\n
    Example (5): insert a range of elements into an object

    The example shows how insert() is used.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // create two JSON objects\n    json j1 = {{\"one\", \"eins\"}, {\"two\", \"zwei\"}};\n    json j2 = {{\"eleven\", \"elf\"}, {\"seventeen\", \"siebzehn\"}};\n\n    // output objects\n    std::cout << j1 << '\\n';\n    std::cout << j2 << '\\n';\n\n    // insert range from j2 to j1\n    j1.insert(j2.begin(), j2.end());\n\n    // output result of insert call\n    std::cout << j1 << '\\n';\n}\n

    Output:

    {\"one\":\"eins\",\"two\":\"zwei\"}\n{\"eleven\":\"elf\",\"seventeen\":\"siebzehn\"}\n{\"eleven\":\"elf\",\"one\":\"eins\",\"seventeen\":\"siebzehn\",\"two\":\"zwei\"}\n
    "},{"location":"api/basic_json/insert/#version-history","title":"Version history","text":"
    1. Added in version 1.0.0.
    2. Added in version 1.0.0.
    3. Added in version 1.0.0.
    4. Added in version 1.0.0.
    5. Added in version 3.0.0.
    "},{"location":"api/basic_json/invalid_iterator/","title":"nlohmann::basic_json::invalid_iterator","text":"
    class invalid_iterator : public exception;\n

    This exception is thrown if iterators passed to a library function do not match the expected semantics.

    Exceptions have ids 2xx (see list of iterator errors).

    classDiagram\n  direction LR\n\n    class std_exception [\"std::exception\"] {\n        <<interface>>\n    }\n\n    class json_exception [\"basic_json::exception\"] {\n        +const int id\n        +const char* what() const\n    }\n\n    class json_parse_error [\"basic_json::parse_error\"] {\n        +const std::size_t byte\n    }\n\n    class json_invalid_iterator [\"basic_json::invalid_iterator\"]\n    class json_type_error [\"basic_json::type_error\"]\n    class json_out_of_range [\"basic_json::out_of_range\"]\n    class json_other_error [\"basic_json::other_error\"]\n\n    std_exception <|-- json_exception\n    json_exception <|-- json_parse_error\n    json_exception <|-- json_invalid_iterator\n    json_exception <|-- json_type_error\n    json_exception <|-- json_out_of_range\n    json_exception <|-- json_other_error\n\n    style json_invalid_iterator fill:#CCCCFF
    "},{"location":"api/basic_json/invalid_iterator/#member-functions","title":"Member functions","text":"
    • what - returns explanatory string
    "},{"location":"api/basic_json/invalid_iterator/#member-variables","title":"Member variables","text":"
    • id - the id of the exception
    "},{"location":"api/basic_json/invalid_iterator/#examples","title":"Examples","text":"Example

    The following code shows how a invalid_iterator exception can be caught.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    try\n    {\n        // calling iterator::key() on non-object iterator\n        json j = \"string\";\n        json::iterator it = j.begin();\n        auto k = it.key();\n    }\n    catch (const json::invalid_iterator& e)\n    {\n        // output exception information\n        std::cout << \"message: \" << e.what() << '\\n'\n                  << \"exception id: \" << e.id << std::endl;\n    }\n}\n

    Output:

    message: [json.exception.invalid_iterator.207] cannot use key() for non-object iterators\nexception id: 207\n
    "},{"location":"api/basic_json/invalid_iterator/#see-also","title":"See also","text":"
    • List of iterator errors
    • parse_error for exceptions indicating a parse error
    • type_error for exceptions indicating executing a member function with a wrong type
    • out_of_range for exceptions indicating access out of the defined range
    • other_error for exceptions indicating other library errors
    "},{"location":"api/basic_json/invalid_iterator/#version-history","title":"Version history","text":"
    • Since version 3.0.0.
    "},{"location":"api/basic_json/is_array/","title":"nlohmann::basic_json::is_array","text":"
    constexpr bool is_array() const noexcept;\n

    This function returns true if and only if the JSON value is an array.

    "},{"location":"api/basic_json/is_array/#return-value","title":"Return value","text":"

    true if type is an array, false otherwise.

    "},{"location":"api/basic_json/is_array/#exception-safety","title":"Exception safety","text":"

    No-throw guarantee: this member function never throws exceptions.

    "},{"location":"api/basic_json/is_array/#complexity","title":"Complexity","text":"

    Constant.

    "},{"location":"api/basic_json/is_array/#examples","title":"Examples","text":"Example

    The following code exemplifies is_array() for all JSON types.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // create JSON values\n    json j_null;\n    json j_boolean = true;\n    json j_number_integer = 17;\n    json j_number_unsigned_integer = 12345678987654321u;\n    json j_number_float = 23.42;\n    json j_object = {{\"one\", 1}, {\"two\", 2}};\n    json j_array = {1, 2, 4, 8, 16};\n    json j_string = \"Hello, world\";\n    json j_binary = json::binary({1, 2, 3});\n\n    // call is_array()\n    std::cout << std::boolalpha;\n    std::cout << j_null.is_array() << '\\n';\n    std::cout << j_boolean.is_array() << '\\n';\n    std::cout << j_number_integer.is_array() << '\\n';\n    std::cout << j_number_unsigned_integer.is_array() << '\\n';\n    std::cout << j_number_float.is_array() << '\\n';\n    std::cout << j_object.is_array() << '\\n';\n    std::cout << j_array.is_array() << '\\n';\n    std::cout << j_string.is_array() << '\\n';\n    std::cout << j_binary.is_array() << '\\n';\n}\n

    Output:

    false\nfalse\nfalse\nfalse\nfalse\nfalse\ntrue\nfalse\nfalse\n
    "},{"location":"api/basic_json/is_array/#version-history","title":"Version history","text":"
    • Added in version 1.0.0.
    "},{"location":"api/basic_json/is_binary/","title":"nlohmann::basic_json::is_binary","text":"
    constexpr bool is_binary() const noexcept;\n

    This function returns true if and only if the JSON value is a binary array.

    "},{"location":"api/basic_json/is_binary/#return-value","title":"Return value","text":"

    true if type is binary, false otherwise.

    "},{"location":"api/basic_json/is_binary/#exception-safety","title":"Exception safety","text":"

    No-throw guarantee: this member function never throws exceptions.

    "},{"location":"api/basic_json/is_binary/#complexity","title":"Complexity","text":"

    Constant.

    "},{"location":"api/basic_json/is_binary/#examples","title":"Examples","text":"Example

    The following code exemplifies is_binary() for all JSON types.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // create JSON values\n    json j_null;\n    json j_boolean = true;\n    json j_number_integer = 17;\n    json j_number_unsigned_integer = 12345678987654321u;\n    json j_number_float = 23.42;\n    json j_object = {{\"one\", 1}, {\"two\", 2}};\n    json j_array = {1, 2, 4, 8, 16};\n    json j_string = \"Hello, world\";\n    json j_binary = json::binary({1, 2, 3});\n\n    // call is_binary()\n    std::cout << std::boolalpha;\n    std::cout << j_null.is_binary() << '\\n';\n    std::cout << j_boolean.is_binary() << '\\n';\n    std::cout << j_number_integer.is_binary() << '\\n';\n    std::cout << j_number_unsigned_integer.is_binary() << '\\n';\n    std::cout << j_number_float.is_binary() << '\\n';\n    std::cout << j_object.is_binary() << '\\n';\n    std::cout << j_array.is_binary() << '\\n';\n    std::cout << j_string.is_binary() << '\\n';\n    std::cout << j_binary.is_binary() << '\\n';\n}\n

    Output:

    false\nfalse\nfalse\nfalse\nfalse\nfalse\nfalse\nfalse\ntrue\n
    "},{"location":"api/basic_json/is_binary/#version-history","title":"Version history","text":"
    • Added in version 3.8.0.
    "},{"location":"api/basic_json/is_boolean/","title":"nlohmann::basic_json::is_boolean","text":"
    constexpr bool is_boolean() const noexcept;\n

    This function returns true if and only if the JSON value is true or false.

    "},{"location":"api/basic_json/is_boolean/#return-value","title":"Return value","text":"

    true if type is boolean, false otherwise.

    "},{"location":"api/basic_json/is_boolean/#exception-safety","title":"Exception safety","text":"

    No-throw guarantee: this member function never throws exceptions.

    "},{"location":"api/basic_json/is_boolean/#complexity","title":"Complexity","text":"

    Constant.

    "},{"location":"api/basic_json/is_boolean/#examples","title":"Examples","text":"Example

    The following code exemplifies is_boolean() for all JSON types.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // create JSON values\n    json j_null;\n    json j_boolean = true;\n    json j_number_integer = 17;\n    json j_number_unsigned_integer = 12345678987654321u;\n    json j_number_float = 23.42;\n    json j_object = {{\"one\", 1}, {\"two\", 2}};\n    json j_array = {1, 2, 4, 8, 16};\n    json j_string = \"Hello, world\";\n    json j_binary = json::binary({1, 2, 3});\n\n    // call is_boolean()\n    std::cout << std::boolalpha;\n    std::cout << j_null.is_boolean() << '\\n';\n    std::cout << j_boolean.is_boolean() << '\\n';\n    std::cout << j_number_integer.is_boolean() << '\\n';\n    std::cout << j_number_unsigned_integer.is_boolean() << '\\n';\n    std::cout << j_number_float.is_boolean() << '\\n';\n    std::cout << j_object.is_boolean() << '\\n';\n    std::cout << j_array.is_boolean() << '\\n';\n    std::cout << j_string.is_boolean() << '\\n';\n    std::cout << j_binary.is_boolean() << '\\n';\n}\n

    Output:

    false\ntrue\nfalse\nfalse\nfalse\nfalse\nfalse\nfalse\nfalse\n
    "},{"location":"api/basic_json/is_boolean/#version-history","title":"Version history","text":"
    • Added in version 1.0.0.
    "},{"location":"api/basic_json/is_discarded/","title":"nlohmann::basic_json::is_discarded","text":"
    constexpr bool is_discarded() const noexcept;\n

    This function returns true for a JSON value if either:

    • the value was discarded during parsing with a callback function (see parser_callback_t), or
    • the value is the result of parsing invalid JSON with parameter allow_exceptions set to false; see parse for more information.
    "},{"location":"api/basic_json/is_discarded/#return-value","title":"Return value","text":"

    true if type is discarded, false otherwise.

    "},{"location":"api/basic_json/is_discarded/#exception-safety","title":"Exception safety","text":"

    No-throw guarantee: this member function never throws exceptions.

    "},{"location":"api/basic_json/is_discarded/#complexity","title":"Complexity","text":"

    Constant.

    "},{"location":"api/basic_json/is_discarded/#notes","title":"Notes","text":"

    Comparisons

    Discarded values are never compared equal with operator==. That is, checking whether a JSON value j is discarded will only work via:

    j.is_discarded()\n

    because

    j == json::value_t::discarded\n

    will always be false.

    Removal during parsing with callback functions

    When a value is discarded by a callback function (see parser_callback_t) during parsing, then it is removed when it is part of a structured value. For instance, if the second value of an array is discarded, instead of [null, discarded, false], the array [null, false] is returned. Only if the top-level value is discarded, the return value of the parse call is discarded.

    This function will always be false for JSON values after parsing. That is, discarded values can only occur during parsing, but will be removed when inside a structured value or replaced by null in other cases.

    "},{"location":"api/basic_json/is_discarded/#examples","title":"Examples","text":"Example

    The following code exemplifies is_discarded() for all JSON types.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // create JSON values\n    json j_null;\n    json j_boolean = true;\n    json j_number_integer = 17;\n    json j_number_unsigned_integer = 12345678987654321u;\n    json j_number_float = 23.42;\n    json j_object = {{\"one\", 1}, {\"two\", 2}};\n    json j_array = {1, 2, 4, 8, 16};\n    json j_string = \"Hello, world\";\n    json j_binary = json::binary({1, 2, 3});\n\n    // call is_discarded()\n    std::cout << std::boolalpha;\n    std::cout << j_null.is_discarded() << '\\n';\n    std::cout << j_boolean.is_discarded() << '\\n';\n    std::cout << j_number_integer.is_discarded() << '\\n';\n    std::cout << j_number_unsigned_integer.is_discarded() << '\\n';\n    std::cout << j_number_float.is_discarded() << '\\n';\n    std::cout << j_object.is_discarded() << '\\n';\n    std::cout << j_array.is_discarded() << '\\n';\n    std::cout << j_string.is_discarded() << '\\n';\n    std::cout << j_binary.is_discarded() << '\\n';\n}\n

    Output:

    false\nfalse\nfalse\nfalse\nfalse\nfalse\nfalse\nfalse\nfalse\n
    "},{"location":"api/basic_json/is_discarded/#version-history","title":"Version history","text":"
    • Added in version 1.0.0.
    "},{"location":"api/basic_json/is_null/","title":"nlohmann::basic_json::is_null","text":"
    constexpr bool is_null() const noexcept;\n

    This function returns true if and only if the JSON value is null.

    "},{"location":"api/basic_json/is_null/#return-value","title":"Return value","text":"

    true if type is null, false otherwise.

    "},{"location":"api/basic_json/is_null/#exception-safety","title":"Exception safety","text":"

    No-throw guarantee: this member function never throws exceptions.

    "},{"location":"api/basic_json/is_null/#complexity","title":"Complexity","text":"

    Constant.

    "},{"location":"api/basic_json/is_null/#examples","title":"Examples","text":"Example

    The following code exemplifies is_null() for all JSON types.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // create JSON values\n    json j_null;\n    json j_boolean = true;\n    json j_number_integer = 17;\n    json j_number_unsigned_integer = 12345678987654321u;\n    json j_number_float = 23.42;\n    json j_object = {{\"one\", 1}, {\"two\", 2}};\n    json j_array = {1, 2, 4, 8, 16};\n    json j_string = \"Hello, world\";\n    json j_binary = json::binary({1, 2, 3});\n\n    // call is_null()\n    std::cout << std::boolalpha;\n    std::cout << j_null.is_null() << '\\n';\n    std::cout << j_boolean.is_null() << '\\n';\n    std::cout << j_number_integer.is_null() << '\\n';\n    std::cout << j_number_unsigned_integer.is_null() << '\\n';\n    std::cout << j_number_float.is_null() << '\\n';\n    std::cout << j_object.is_null() << '\\n';\n    std::cout << j_array.is_null() << '\\n';\n    std::cout << j_string.is_null() << '\\n';\n    std::cout << j_binary.is_null() << '\\n';\n}\n

    Output:

    true\nfalse\nfalse\nfalse\nfalse\nfalse\nfalse\nfalse\nfalse\n
    "},{"location":"api/basic_json/is_null/#version-history","title":"Version history","text":"
    • Added in version 1.0.0.
    "},{"location":"api/basic_json/is_number/","title":"nlohmann::basic_json::is_number","text":"
    constexpr bool is_number() const noexcept;\n

    This function returns true if and only if the JSON value is a number. This includes both integer (signed and unsigned) and floating-point values.

    "},{"location":"api/basic_json/is_number/#return-value","title":"Return value","text":"

    true if type is number (regardless whether integer, unsigned integer, or floating-type), false otherwise.

    "},{"location":"api/basic_json/is_number/#exception-safety","title":"Exception safety","text":"

    No-throw guarantee: this member function never throws exceptions.

    "},{"location":"api/basic_json/is_number/#complexity","title":"Complexity","text":"

    Constant.

    "},{"location":"api/basic_json/is_number/#possible-implementation","title":"Possible implementation","text":"
    constexpr bool is_number() const noexcept\n{\n    return is_number_integer() || is_number_float();\n}\n
    "},{"location":"api/basic_json/is_number/#examples","title":"Examples","text":"Example

    The following code exemplifies is_number() for all JSON types.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // create JSON values\n    json j_null;\n    json j_boolean = true;\n    json j_number_integer = 17;\n    json j_number_unsigned_integer = 12345678987654321u;\n    json j_number_float = 23.42;\n    json j_object = {{\"one\", 1}, {\"two\", 2}};\n    json j_array = {1, 2, 4, 8, 16};\n    json j_string = \"Hello, world\";\n    json j_binary = json::binary({1, 2, 3});\n\n    // call is_number()\n    std::cout << std::boolalpha;\n    std::cout << j_null.is_number() << '\\n';\n    std::cout << j_boolean.is_number() << '\\n';\n    std::cout << j_number_integer.is_number() << '\\n';\n    std::cout << j_number_unsigned_integer.is_number() << '\\n';\n    std::cout << j_number_float.is_number() << '\\n';\n    std::cout << j_object.is_number() << '\\n';\n    std::cout << j_array.is_number() << '\\n';\n    std::cout << j_string.is_number() << '\\n';\n    std::cout << j_binary.is_number() << '\\n';\n}\n

    Output:

    false\nfalse\ntrue\ntrue\ntrue\nfalse\nfalse\nfalse\nfalse\n
    "},{"location":"api/basic_json/is_number/#see-also","title":"See also","text":"
    • is_number_integer() check if the value is an integer or unsigned integer number
    • is_number_unsigned() check if the value is an unsigned integer number
    • is_number_float() check if the value is a floating-point number
    "},{"location":"api/basic_json/is_number/#version-history","title":"Version history","text":"
    • Added in version 1.0.0.
    • Extended to also return true for unsigned integers in 2.0.0.
    "},{"location":"api/basic_json/is_number_float/","title":"nlohmann::basic_json::is_number_float","text":"
    constexpr bool is_number_float() const noexcept;\n

    This function returns true if and only if the JSON value is a floating-point number. This excludes signed and unsigned integer values.

    "},{"location":"api/basic_json/is_number_float/#return-value","title":"Return value","text":"

    true if type is a floating-point number, false otherwise.

    "},{"location":"api/basic_json/is_number_float/#exception-safety","title":"Exception safety","text":"

    No-throw guarantee: this member function never throws exceptions.

    "},{"location":"api/basic_json/is_number_float/#complexity","title":"Complexity","text":"

    Constant.

    "},{"location":"api/basic_json/is_number_float/#examples","title":"Examples","text":"Example

    The following code exemplifies is_number_float() for all JSON types.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // create JSON values\n    json j_null;\n    json j_boolean = true;\n    json j_number_integer = 17;\n    json j_number_unsigned_integer = 12345678987654321u;\n    json j_number_float = 23.42;\n    json j_object = {{\"one\", 1}, {\"two\", 2}};\n    json j_array = {1, 2, 4, 8, 16};\n    json j_string = \"Hello, world\";\n    json j_binary = json::binary({1, 2, 3});\n\n    // call is_number_float()\n    std::cout << std::boolalpha;\n    std::cout << j_null.is_number_float() << '\\n';\n    std::cout << j_boolean.is_number_float() << '\\n';\n    std::cout << j_number_integer.is_number_float() << '\\n';\n    std::cout << j_number_unsigned_integer.is_number_float() << '\\n';\n    std::cout << j_number_float.is_number_float() << '\\n';\n    std::cout << j_object.is_number_float() << '\\n';\n    std::cout << j_array.is_number_float() << '\\n';\n    std::cout << j_string.is_number_float() << '\\n';\n    std::cout << j_binary.is_number_float() << '\\n';\n}\n

    Output:

    false\nfalse\nfalse\nfalse\ntrue\nfalse\nfalse\nfalse\nfalse\n
    "},{"location":"api/basic_json/is_number_float/#see-also","title":"See also","text":"
    • is_number() check if the value is a number
    • is_number_integer() check if the value is an integer or unsigned integer number
    • is_number_unsigned() check if the value is an unsigned integer number
    "},{"location":"api/basic_json/is_number_float/#version-history","title":"Version history","text":"
    • Added in version 1.0.0.
    "},{"location":"api/basic_json/is_number_integer/","title":"nlohmann::basic_json::is_number_integer","text":"
    constexpr bool is_number_integer() const noexcept;\n

    This function returns true if and only if the JSON value is a signed or unsigned integer number. This excludes floating-point values.

    "},{"location":"api/basic_json/is_number_integer/#return-value","title":"Return value","text":"

    true if type is an integer or unsigned integer number, false otherwise.

    "},{"location":"api/basic_json/is_number_integer/#exception-safety","title":"Exception safety","text":"

    No-throw guarantee: this member function never throws exceptions.

    "},{"location":"api/basic_json/is_number_integer/#complexity","title":"Complexity","text":"

    Constant.

    "},{"location":"api/basic_json/is_number_integer/#examples","title":"Examples","text":"Example

    The following code exemplifies is_number_integer() for all JSON types.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // create JSON values\n    json j_null;\n    json j_boolean = true;\n    json j_number_integer = 17;\n    json j_number_unsigned_integer = 12345678987654321u;\n    json j_number_float = 23.42;\n    json j_object = {{\"one\", 1}, {\"two\", 2}};\n    json j_array = {1, 2, 4, 8, 16};\n    json j_string = \"Hello, world\";\n    json j_binary = json::binary({1, 2, 3});\n\n    // call is_number_integer()\n    std::cout << std::boolalpha;\n    std::cout << j_null.is_number_integer() << '\\n';\n    std::cout << j_boolean.is_number_integer() << '\\n';\n    std::cout << j_number_integer.is_number_integer() << '\\n';\n    std::cout << j_number_unsigned_integer.is_number_integer() << '\\n';\n    std::cout << j_number_float.is_number_integer() << '\\n';\n    std::cout << j_object.is_number_integer() << '\\n';\n    std::cout << j_array.is_number_integer() << '\\n';\n    std::cout << j_string.is_number_integer() << '\\n';\n    std::cout << j_binary.is_number_integer() << '\\n';\n}\n

    Output:

    false\nfalse\ntrue\ntrue\nfalse\nfalse\nfalse\nfalse\nfalse\n
    "},{"location":"api/basic_json/is_number_integer/#see-also","title":"See also","text":"
    • is_number() check if the value is a number
    • is_number_unsigned() check if the value is an unsigned integer number
    • is_number_float() check if the value is a floating-point number
    "},{"location":"api/basic_json/is_number_integer/#version-history","title":"Version history","text":"
    • Added in version 1.0.0.
    • Extended to also return true for unsigned integers in 2.0.0.
    "},{"location":"api/basic_json/is_number_unsigned/","title":"nlohmann::basic_json::is_number_unsigned","text":"
    constexpr bool is_number_unsigned() const noexcept;\n

    This function returns true if and only if the JSON value is an unsigned integer number. This excludes floating-point and signed integer values.

    "},{"location":"api/basic_json/is_number_unsigned/#return-value","title":"Return value","text":"

    true if type is an unsigned integer number, false otherwise.

    "},{"location":"api/basic_json/is_number_unsigned/#exception-safety","title":"Exception safety","text":"

    No-throw guarantee: this member function never throws exceptions.

    "},{"location":"api/basic_json/is_number_unsigned/#complexity","title":"Complexity","text":"

    Constant.

    "},{"location":"api/basic_json/is_number_unsigned/#examples","title":"Examples","text":"Example

    The following code exemplifies is_number_unsigned() for all JSON types.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // create JSON values\n    json j_null;\n    json j_boolean = true;\n    json j_number_integer = 17;\n    json j_number_unsigned_integer = 12345678987654321u;\n    json j_number_float = 23.42;\n    json j_object = {{\"one\", 1}, {\"two\", 2}};\n    json j_array = {1, 2, 4, 8, 16};\n    json j_string = \"Hello, world\";\n    json j_binary = json::binary({1, 2, 3});\n\n    // call is_number_unsigned()\n    std::cout << std::boolalpha;\n    std::cout << j_null.is_number_unsigned() << '\\n';\n    std::cout << j_boolean.is_number_unsigned() << '\\n';\n    std::cout << j_number_integer.is_number_unsigned() << '\\n';\n    std::cout << j_number_unsigned_integer.is_number_unsigned() << '\\n';\n    std::cout << j_number_float.is_number_unsigned() << '\\n';\n    std::cout << j_object.is_number_unsigned() << '\\n';\n    std::cout << j_array.is_number_unsigned() << '\\n';\n    std::cout << j_string.is_number_unsigned() << '\\n';\n    std::cout << j_binary.is_number_unsigned() << '\\n';\n}\n

    Output:

    false\nfalse\nfalse\ntrue\nfalse\nfalse\nfalse\nfalse\nfalse\n
    "},{"location":"api/basic_json/is_number_unsigned/#see-also","title":"See also","text":"
    • is_number() check if the value is a number
    • is_number_integer() check if the value is an integer or unsigned integer number
    • is_number_float() check if the value is a floating-point number
    "},{"location":"api/basic_json/is_number_unsigned/#version-history","title":"Version history","text":"
    • Added in version 2.0.0.
    "},{"location":"api/basic_json/is_object/","title":"nlohmann::basic_json::is_object","text":"
    constexpr bool is_object() const noexcept;\n

    This function returns true if and only if the JSON value is an object.

    "},{"location":"api/basic_json/is_object/#return-value","title":"Return value","text":"

    true if type is an object, false otherwise.

    "},{"location":"api/basic_json/is_object/#exception-safety","title":"Exception safety","text":"

    No-throw guarantee: this member function never throws exceptions.

    "},{"location":"api/basic_json/is_object/#complexity","title":"Complexity","text":"

    Constant.

    "},{"location":"api/basic_json/is_object/#examples","title":"Examples","text":"Example

    The following code exemplifies is_object() for all JSON types.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // create JSON values\n    json j_null;\n    json j_boolean = true;\n    json j_number_integer = 17;\n    json j_number_float = 23.42;\n    json j_number_unsigned_integer = 12345678987654321u;\n    json j_object = {{\"one\", 1}, {\"two\", 2}};\n    json j_array = {1, 2, 4, 8, 16};\n    json j_string = \"Hello, world\";\n    json j_binary = json::binary({1, 2, 3});\n\n    // call is_object()\n    std::cout << std::boolalpha;\n    std::cout << j_null.is_object() << '\\n';\n    std::cout << j_boolean.is_object() << '\\n';\n    std::cout << j_number_integer.is_object() << '\\n';\n    std::cout << j_number_unsigned_integer.is_object() << '\\n';\n    std::cout << j_number_float.is_object() << '\\n';\n    std::cout << j_object.is_object() << '\\n';\n    std::cout << j_array.is_object() << '\\n';\n    std::cout << j_string.is_object() << '\\n';\n    std::cout << j_binary.is_object() << '\\n';\n}\n

    Output:

    false\nfalse\nfalse\nfalse\nfalse\ntrue\nfalse\nfalse\nfalse\n
    "},{"location":"api/basic_json/is_object/#version-history","title":"Version history","text":"
    • Added in version 1.0.0.
    "},{"location":"api/basic_json/is_primitive/","title":"nlohmann::basic_json::is_primitive","text":"
    constexpr bool is_primitive() const noexcept;\n

    This function returns true if and only if the JSON type is primitive (string, number, boolean, null, binary).

    "},{"location":"api/basic_json/is_primitive/#return-value","title":"Return value","text":"

    true if type is primitive (string, number, boolean, null, or binary), false otherwise.

    "},{"location":"api/basic_json/is_primitive/#exception-safety","title":"Exception safety","text":"

    No-throw guarantee: this member function never throws exceptions.

    "},{"location":"api/basic_json/is_primitive/#complexity","title":"Complexity","text":"

    Constant.

    "},{"location":"api/basic_json/is_primitive/#possible-implementation","title":"Possible implementation","text":"
    constexpr bool is_primitive() const noexcept\n{\n    return is_null() || is_string() || is_boolean() || is_number() || is_binary();\n}\n
    "},{"location":"api/basic_json/is_primitive/#notes","title":"Notes","text":"

    The term primitive stems from RFC 8259:

    JSON can represent four primitive types (strings, numbers, booleans, and null) and two structured types (objects and arrays).

    This library extends primitive types to binary types, because binary types are roughly comparable to strings. Hence, is_primitive() returns true for binary values.

    "},{"location":"api/basic_json/is_primitive/#examples","title":"Examples","text":"Example

    The following code exemplifies is_primitive() for all JSON types.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // create JSON values\n    json j_null;\n    json j_boolean = true;\n    json j_number_integer = 17;\n    json j_number_float = 23.42;\n    json j_number_unsigned_integer = 12345678987654321u;\n    json j_object = {{\"one\", 1}, {\"two\", 2}};\n    json j_array = {1, 2, 4, 8, 16};\n    json j_string = \"Hello, world\";\n    json j_binary = json::binary({1, 2, 3});\n\n    // call is_primitive()\n    std::cout << std::boolalpha;\n    std::cout << j_null.is_primitive() << '\\n';\n    std::cout << j_boolean.is_primitive() << '\\n';\n    std::cout << j_number_integer.is_primitive() << '\\n';\n    std::cout << j_number_unsigned_integer.is_primitive() << '\\n';\n    std::cout << j_number_float.is_primitive() << '\\n';\n    std::cout << j_object.is_primitive() << '\\n';\n    std::cout << j_array.is_primitive() << '\\n';\n    std::cout << j_string.is_primitive() << '\\n';\n    std::cout << j_binary.is_primitive() << '\\n';\n}\n

    Output:

    true\ntrue\ntrue\ntrue\ntrue\nfalse\nfalse\ntrue\ntrue\n
    "},{"location":"api/basic_json/is_primitive/#see-also","title":"See also","text":"
    • is_structured() returns whether the JSON value is structured
    • is_null() returns whether the JSON value is null
    • is_string() returns whether the JSON value is a string
    • is_boolean() returns whether the JSON value is a boolean
    • is_number() returns whether the JSON value is a number
    • is_binary() returns whether the JSON value is a binary array
    "},{"location":"api/basic_json/is_primitive/#version-history","title":"Version history","text":"
    • Added in version 1.0.0.
    • Extended to return true for binary types in version 3.8.0.
    "},{"location":"api/basic_json/is_string/","title":"nlohmann::basic_json::is_string","text":"
    constexpr bool is_string() const noexcept;\n

    This function returns true if and only if the JSON value is a string.

    "},{"location":"api/basic_json/is_string/#return-value","title":"Return value","text":"

    true if type is a string, false otherwise.

    "},{"location":"api/basic_json/is_string/#exception-safety","title":"Exception safety","text":"

    No-throw guarantee: this member function never throws exceptions.

    "},{"location":"api/basic_json/is_string/#complexity","title":"Complexity","text":"

    Constant.

    "},{"location":"api/basic_json/is_string/#examples","title":"Examples","text":"Example

    The following code exemplifies is_string() for all JSON types.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // create JSON values\n    json j_null;\n    json j_boolean = true;\n    json j_number_integer = 17;\n    json j_number_float = 23.42;\n    json j_number_unsigned_integer = 12345678987654321u;\n    json j_object = {{\"one\", 1}, {\"two\", 2}};\n    json j_array = {1, 2, 4, 8, 16};\n    json j_string = \"Hello, world\";\n    json j_binary = json::binary({1, 2, 3});\n\n    // call is_string()\n    std::cout << std::boolalpha;\n    std::cout << j_null.is_string() << '\\n';\n    std::cout << j_boolean.is_string() << '\\n';\n    std::cout << j_number_integer.is_string() << '\\n';\n    std::cout << j_number_unsigned_integer.is_string() << '\\n';\n    std::cout << j_number_float.is_string() << '\\n';\n    std::cout << j_object.is_string() << '\\n';\n    std::cout << j_array.is_string() << '\\n';\n    std::cout << j_string.is_string() << '\\n';\n    std::cout << j_binary.is_string() << '\\n';\n}\n

    Output:

    false\nfalse\nfalse\nfalse\nfalse\nfalse\nfalse\ntrue\nfalse\n
    "},{"location":"api/basic_json/is_string/#version-history","title":"Version history","text":"
    • Added in version 1.0.0.
    "},{"location":"api/basic_json/is_structured/","title":"nlohmann::basic_json::is_structured","text":"
    constexpr bool is_structured() const noexcept;\n

    This function returns true if and only if the JSON type is structured (array or object).

    "},{"location":"api/basic_json/is_structured/#return-value","title":"Return value","text":"

    true if type is structured (array or object), false otherwise.

    "},{"location":"api/basic_json/is_structured/#exception-safety","title":"Exception safety","text":"

    No-throw guarantee: this member function never throws exceptions.

    "},{"location":"api/basic_json/is_structured/#complexity","title":"Complexity","text":"

    Constant.

    "},{"location":"api/basic_json/is_structured/#possible-implementation","title":"Possible implementation","text":"
    constexpr bool is_structured() const noexcept\n{\n    return is_array() || is_object();\n}\n
    "},{"location":"api/basic_json/is_structured/#notes","title":"Notes","text":"

    The term structured stems from RFC 8259:

    JSON can represent four primitive types (strings, numbers, booleans, and null) and two structured types (objects and arrays).

    Note that though strings are containers in C++, they are treated as primitive values in JSON.

    "},{"location":"api/basic_json/is_structured/#examples","title":"Examples","text":"Example

    The following code exemplifies is_structured() for all JSON types.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // create JSON values\n    json j_null;\n    json j_boolean = true;\n    json j_number_integer = 17;\n    json j_number_float = 23.42;\n    json j_number_unsigned_integer = 12345678987654321u;\n    json j_object = {{\"one\", 1}, {\"two\", 2}};\n    json j_array = {1, 2, 4, 8, 16};\n    json j_string = \"Hello, world\";\n    json j_binary = json::binary({1, 2, 3});\n\n    // call is_structured()\n    std::cout << std::boolalpha;\n    std::cout << j_null.is_structured() << '\\n';\n    std::cout << j_boolean.is_structured() << '\\n';\n    std::cout << j_number_integer.is_structured() << '\\n';\n    std::cout << j_number_unsigned_integer.is_structured() << '\\n';\n    std::cout << j_number_float.is_structured() << '\\n';\n    std::cout << j_object.is_structured() << '\\n';\n    std::cout << j_array.is_structured() << '\\n';\n    std::cout << j_string.is_structured() << '\\n';\n    std::cout << j_binary.is_structured() << '\\n';\n}\n

    Output:

    false\nfalse\nfalse\nfalse\nfalse\ntrue\ntrue\nfalse\nfalse\n
    "},{"location":"api/basic_json/is_structured/#see-also","title":"See also","text":"
    • is_primitive() returns whether JSON value is primitive
    • is_array() returns whether the value is an array
    • is_object() returns whether the value is an object
    "},{"location":"api/basic_json/is_structured/#version-history","title":"Version history","text":"
    • Added in version 1.0.0.
    "},{"location":"api/basic_json/items/","title":"nlohmann::basic_json::items","text":"
    iteration_proxy<iterator> items() noexcept;\niteration_proxy<const_iterator> items() const noexcept;\n

    This function allows accessing iterator::key() and iterator::value() during range-based for loops. In these loops, a reference to the JSON values is returned, so there is no access to the underlying iterator.

    For loop without items() function:

    for (auto it = j_object.begin(); it != j_object.end(); ++it)\n{\n    std::cout << \"key: \" << it.key() << \", value:\" << it.value() << '\\n';\n}\n

    Range-based for loop without items() function:

    for (auto it : j_object)\n{\n    // \"it\" is of type json::reference and has no key() member\n    std::cout << \"value: \" << it << '\\n';\n}\n

    Range-based for loop with items() function:

    for (auto& el : j_object.items())\n{\n    std::cout << \"key: \" << el.key() << \", value:\" << el.value() << '\\n';\n}\n

    The items() function also allows using structured bindings (C++17):

    for (auto& [key, val] : j_object.items())\n{\n    std::cout << \"key: \" << key << \", value:\" << val << '\\n';\n}\n
    "},{"location":"api/basic_json/items/#return-value","title":"Return value","text":"

    iteration proxy object wrapping the current value with an interface to use in range-based for loops

    "},{"location":"api/basic_json/items/#exception-safety","title":"Exception safety","text":"

    Strong guarantee: if an exception is thrown, there are no changes in the JSON value.

    "},{"location":"api/basic_json/items/#complexity","title":"Complexity","text":"

    Constant.

    "},{"location":"api/basic_json/items/#notes","title":"Notes","text":"

    When iterating over an array, key() will return the index of the element as string (see example). For primitive types (e.g., numbers), key() returns an empty string.

    Lifetime issues

    Using items() on temporary objects is dangerous. Make sure the object's lifetime exceeds the iteration. See #2040 for more information.

    "},{"location":"api/basic_json/items/#examples","title":"Examples","text":"Example

    The following code shows an example for items().

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // create JSON values\n    json j_object = {{\"one\", 1}, {\"two\", 2}};\n    json j_array = {1, 2, 4, 8, 16};\n\n    // example for an object\n    for (auto& x : j_object.items())\n    {\n        std::cout << \"key: \" << x.key() << \", value: \" << x.value() << '\\n';\n    }\n\n    // example for an array\n    for (auto& x : j_array.items())\n    {\n        std::cout << \"key: \" << x.key() << \", value: \" << x.value() << '\\n';\n    }\n}\n

    Output:

    key: one, value: 1\nkey: two, value: 2\nkey: 0, value: 1\nkey: 1, value: 2\nkey: 2, value: 4\nkey: 3, value: 8\nkey: 4, value: 16\n
    "},{"location":"api/basic_json/items/#version-history","title":"Version history","text":"
    • Added iterator_wrapper in version 3.0.0.
    • Added items and deprecated iterator_wrapper in version 3.1.0.
    • Added structured binding support in version 3.5.0.

    Deprecation

    This function replaces the static function iterator_wrapper which was introduced in version 1.0.0, but has been deprecated in version 3.1.0. Function iterator_wrapper will be removed in version 4.0.0. Please replace all occurrences of iterator_wrapper(j) with j.items().

    You should be warned by your compiler with a -Wdeprecated-declarations warning if you are using a deprecated function.

    "},{"location":"api/basic_json/json_base_class_t/","title":"nlohmann::basic_json::json_base_class_t","text":"
    using json_base_class_t = detail::json_base_class<CustomBaseClass>;\n

    The base class used to inject custom functionality into each instance of basic_json. Examples of such functionality might be metadata, additional member functions (e.g., visitors), or other application-specific code.

    "},{"location":"api/basic_json/json_base_class_t/#template-parameters","title":"Template parameters","text":"CustomBaseClass the base class to be added to basic_json"},{"location":"api/basic_json/json_base_class_t/#notes","title":"Notes","text":""},{"location":"api/basic_json/json_base_class_t/#default-type","title":"Default type","text":"

    The default value for CustomBaseClass is void. In this case, an empty base class is used and no additional functionality is injected.

    "},{"location":"api/basic_json/json_base_class_t/#limitations","title":"Limitations","text":"

    The type CustomBaseClass has to be a default-constructible class. basic_json only supports copy/move construction/assignment if CustomBaseClass does so as well.

    "},{"location":"api/basic_json/json_base_class_t/#examples","title":"Examples","text":"Example

    The following code shows how to inject custom data and methods for each node.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nclass visitor_adaptor_with_metadata\n{\n  public:\n    template <class Fnc>\n    void visit(const Fnc& fnc) const;\n\n    int metadata = 42;\n  private:\n    template <class Ptr, class Fnc>\n    void do_visit(const Ptr& ptr, const Fnc& fnc) const;\n};\n\nusing json = nlohmann::basic_json <\n             std::map,\n             std::vector,\n             std::string,\n             bool,\n             std::int64_t,\n             std::uint64_t,\n             double,\n             std::allocator,\n             nlohmann::adl_serializer,\n             std::vector<std::uint8_t>,\n             visitor_adaptor_with_metadata\n             >;\n\ntemplate <class Fnc>\nvoid visitor_adaptor_with_metadata::visit(const Fnc& fnc) const\n{\n    do_visit(json::json_pointer{}, fnc);\n}\n\ntemplate <class Ptr, class Fnc>\nvoid visitor_adaptor_with_metadata::do_visit(const Ptr& ptr, const Fnc& fnc) const\n{\n    using value_t = nlohmann::detail::value_t;\n    const json& j = *static_cast<const json*>(this);\n    switch (j.type())\n    {\n        case value_t::object:\n            fnc(ptr, j);\n            for (const auto& entry : j.items())\n            {\n                entry.value().do_visit(ptr / entry.key(), fnc);\n            }\n            break;\n        case value_t::array:\n            fnc(ptr, j);\n            for (std::size_t i = 0; i < j.size(); ++i)\n            {\n                j.at(i).do_visit(ptr / std::to_string(i), fnc);\n            }\n            break;\n        case value_t::null:\n        case value_t::string:\n        case value_t::boolean:\n        case value_t::number_integer:\n        case value_t::number_unsigned:\n        case value_t::number_float:\n        case value_t::binary:\n            fnc(ptr, j);\n            break;\n        case value_t::discarded:\n        default:\n            break;\n    }\n}\n\nint main()\n{\n    // create a json object\n    json j;\n    j[\"null\"];\n    j[\"object\"][\"uint\"] = 1U;\n    j[\"object\"].metadata = 21;\n\n    // visit and output\n    j.visit(\n         [&](const json::json_pointer & p,\n             const json & j)\n    {\n        std::cout << (p.empty() ? std::string{\"/\"} : p.to_string())\n                  << \" - metadata = \" << j.metadata << \" -> \" << j.dump() << '\\n';\n    });\n}\n

    Output:

    / - metadata = 42 -> {\"null\":null,\"object\":{\"uint\":1}}\n/null - metadata = 42 -> null\n/object - metadata = 21 -> {\"uint\":1}\n/object/uint - metadata = 42 -> 1\n
    "},{"location":"api/basic_json/json_base_class_t/#version-history","title":"Version history","text":"
    • Added in version 3.12.0.
    "},{"location":"api/basic_json/json_serializer/","title":"nlohmann::basic_json::json_serializer","text":"
    template<typename T, typename SFINAE>\nusing json_serializer = JSONSerializer<T, SFINAE>;\n
    "},{"location":"api/basic_json/json_serializer/#template-parameters","title":"Template parameters","text":"T type to convert; will be used in the to_json/from_json functions SFINAE type to add compile type checks via SFINAE; usually void"},{"location":"api/basic_json/json_serializer/#notes","title":"Notes","text":""},{"location":"api/basic_json/json_serializer/#default-type","title":"Default type","text":"

    The default values for json_serializer is adl_serializer.

    "},{"location":"api/basic_json/json_serializer/#examples","title":"Examples","text":"Example

    The example below shows how a conversion of a non-default-constructible type is implemented via a specialization of the adl_serializer.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nnamespace ns\n{\n// a simple struct to model a person (not default constructible)\nstruct person\n{\n    person(std::string n, std::string a, int aa)\n        : name(std::move(n)), address(std::move(a)), age(aa)\n    {}\n\n    std::string name;\n    std::string address;\n    int age;\n};\n} // namespace ns\n\nnamespace nlohmann\n{\ntemplate <>\nstruct adl_serializer<ns::person>\n{\n    static ns::person from_json(const json& j)\n    {\n        return {j.at(\"name\"), j.at(\"address\"), j.at(\"age\")};\n    }\n\n    // Here's the catch! You must provide a to_json method! Otherwise, you\n    // will not be able to convert person to json, since you fully\n    // specialized adl_serializer on that type\n    static void to_json(json& j, ns::person p)\n    {\n        j[\"name\"] = p.name;\n        j[\"address\"] = p.address;\n        j[\"age\"] = p.age;\n    }\n};\n} // namespace nlohmann\n\nint main()\n{\n    json j;\n    j[\"name\"] = \"Ned Flanders\";\n    j[\"address\"] = \"744 Evergreen Terrace\";\n    j[\"age\"] = 60;\n\n    auto p = j.template get<ns::person>();\n\n    std::cout << p.name << \" (\" << p.age << \") lives in \" << p.address << std::endl;\n}\n

    Output:

    Ned Flanders (60) lives in 744 Evergreen Terrace\n
    "},{"location":"api/basic_json/json_serializer/#version-history","title":"Version history","text":"
    • Since version 2.0.0.
    "},{"location":"api/basic_json/max_size/","title":"nlohmann::basic_json::max_size","text":"
    size_type max_size() const noexcept;\n

    Returns the maximum number of elements a JSON value is able to hold due to system or library implementation limitations, i.e. std::distance(begin(), end()) for the JSON value.

    "},{"location":"api/basic_json/max_size/#return-value","title":"Return value","text":"

    The return value depends on the different types and is defined as follows:

    Value type return value null 0 (same as size()) boolean 1 (same as size()) string 1 (same as size()) number 1 (same as size()) binary 1 (same as size()) object result of function object_t::max_size() array result of function array_t::max_size()"},{"location":"api/basic_json/max_size/#exception-safety","title":"Exception safety","text":"

    No-throw guarantee: this function never throws exceptions.

    "},{"location":"api/basic_json/max_size/#complexity","title":"Complexity","text":"

    Constant, as long as array_t and object_t satisfy the Container concept; that is, their max_size() functions have constant complexity.

    "},{"location":"api/basic_json/max_size/#notes","title":"Notes","text":"

    This function does not return the maximal length of a string stored as JSON value -- it returns the maximal number of string elements the JSON value can store which is 1.

    "},{"location":"api/basic_json/max_size/#examples","title":"Examples","text":"Example

    The following code calls max_size() on the different value types.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // create JSON values\n    json j_null;\n    json j_boolean = true;\n    json j_number_integer = 17;\n    json j_number_float = 23.42;\n    json j_object = {{\"one\", 1}, {\"two\", 2}};\n    json j_array = {1, 2, 4, 8, 16};\n    json j_string = \"Hello, world\";\n\n    // call max_size()\n    std::cout << j_null.max_size() << '\\n';\n    std::cout << j_boolean.max_size() << '\\n';\n    std::cout << j_number_integer.max_size() << '\\n';\n    std::cout << j_number_float.max_size() << '\\n';\n    std::cout << j_object.max_size() << '\\n';\n    std::cout << j_array.max_size() << '\\n';\n    std::cout << j_string.max_size() << '\\n';\n}\n

    Output:

    0\n1\n1\n1\n115292150460684697\n576460752303423487\n1\n

    Note the output is platform-dependent.

    "},{"location":"api/basic_json/max_size/#version-history","title":"Version history","text":"
    • Added in version 1.0.0.
    • Extended to return 1 for binary types in version 3.8.0.
    "},{"location":"api/basic_json/merge_patch/","title":"nlohmann::basic_json::merge_patch","text":"
    void merge_patch(const basic_json& apply_patch);\n

    The merge patch format is primarily intended for use with the HTTP PATCH method as a means of describing a set of modifications to a target resource's content. This function applies a merge patch to the current JSON value.

    The function implements the following algorithm from Section 2 of RFC 7396 (JSON Merge Patch):

    define MergePatch(Target, Patch):\n  if Patch is an Object:\n    if Target is not an Object:\n      Target = {} // Ignore the contents and set it to an empty Object\n    for each Name/Value pair in Patch:\n      if Value is null:\n        if Name exists in Target:\n          remove the Name/Value pair from Target\n      else:\n        Target[Name] = MergePatch(Target[Name], Value)\n    return Target\n  else:\n    return Patch\n

    Thereby, Target is the current object; that is, the patch is applied to the current value.

    "},{"location":"api/basic_json/merge_patch/#parameters","title":"Parameters","text":"apply_patch (in) the patch to apply"},{"location":"api/basic_json/merge_patch/#complexity","title":"Complexity","text":"

    Linear in the lengths of apply_patch.

    "},{"location":"api/basic_json/merge_patch/#examples","title":"Examples","text":"Example

    The following code shows how a JSON Merge Patch is applied to a JSON document.

    #include <iostream>\n#include <nlohmann/json.hpp>\n#include <iomanip> // for std::setw\n\nusing json = nlohmann::json;\nusing namespace nlohmann::literals;\n\nint main()\n{\n    // the original document\n    json document = R\"({\n                \"title\": \"Goodbye!\",\n                \"author\": {\n                    \"givenName\": \"John\",\n                    \"familyName\": \"Doe\"\n                },\n                \"tags\": [\n                    \"example\",\n                    \"sample\"\n                ],\n                \"content\": \"This will be unchanged\"\n            })\"_json;\n\n    // the patch\n    json patch = R\"({\n                \"title\": \"Hello!\",\n                \"phoneNumber\": \"+01-123-456-7890\",\n                \"author\": {\n                    \"familyName\": null\n                },\n                \"tags\": [\n                    \"example\"\n                ]\n            })\"_json;\n\n    // apply the patch\n    document.merge_patch(patch);\n\n    // output original and patched document\n    std::cout << std::setw(4) << document << std::endl;\n}\n

    Output:

    {\n    \"author\": {\n        \"givenName\": \"John\"\n    },\n    \"content\": \"This will be unchanged\",\n    \"phoneNumber\": \"+01-123-456-7890\",\n    \"tags\": [\n        \"example\"\n    ],\n    \"title\": \"Hello!\"\n}\n
    "},{"location":"api/basic_json/merge_patch/#see-also","title":"See also","text":"
    • RFC 7396 (JSON Merge Patch)
    • patch apply a JSON patch
    "},{"location":"api/basic_json/merge_patch/#version-history","title":"Version history","text":"
    • Added in version 3.0.0.
    "},{"location":"api/basic_json/meta/","title":"nlohmann::basic_json::meta","text":"
    static basic_json meta();\n

    This function returns a JSON object with information about the library, including the version number and information on the platform and compiler.

    "},{"location":"api/basic_json/meta/#return-value","title":"Return value","text":"

    JSON object holding version information

    key description compiler Information on the used compiler. It is an object with the following keys: c++ (the used C++ standard), family (the compiler family; possible values are clang, icc, gcc, ilecpp, msvc, pgcpp, sunpro, and unknown), and version (the compiler version). copyright The copyright line for the library as string. name The name of the library as string. platform The used platform as string. Possible values are win32, linux, apple, unix, and unknown. url The URL of the project as string. version The version of the library. It is an object with the following keys: major, minor, and patch as defined by Semantic Versioning, and string (the version string)."},{"location":"api/basic_json/meta/#exception-safety","title":"Exception safety","text":"

    Strong guarantee: if an exception is thrown, there are no changes to any JSON value.

    "},{"location":"api/basic_json/meta/#complexity","title":"Complexity","text":"

    Constant.

    "},{"location":"api/basic_json/meta/#examples","title":"Examples","text":"Example

    The following code shows an example output of the meta() function.

    #include <iostream>\n#include <iomanip>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // call meta()\n    std::cout << std::setw(4) << json::meta() << '\\n';\n}\n

    Output:

    {\n    \"compiler\": {\n        \"c++\": \"201103\",\n        \"family\": \"gcc\",\n        \"version\": \"12.4.0\"\n    },\n    \"copyright\": \"(C) 2013-2025 Niels Lohmann\",\n    \"name\": \"JSON for Modern C++\",\n    \"platform\": \"apple\",\n    \"url\": \"https://github.com/nlohmann/json\",\n    \"version\": {\n        \"major\": 3,\n        \"minor\": 12,\n        \"patch\": 0,\n        \"string\": \"3.12.0\"\n    }\n}\n

    Note the output is platform-dependent.

    "},{"location":"api/basic_json/meta/#see-also","title":"See also","text":"
    • NLOHMANN_JSON_VERSION_MAJOR/NLOHMANN_JSON_VERSION_MINOR/NLOHMANN_JSON_VERSION_PATCH - library version information
    "},{"location":"api/basic_json/meta/#version-history","title":"Version history","text":"
    • Added in version 2.1.0.
    "},{"location":"api/basic_json/number_float_t/","title":"nlohmann::basic_json::number_float_t","text":"
    using number_float_t = NumberFloatType;\n

    The type used to store JSON numbers (floating-point).

    RFC 8259 describes numbers as follows:

    The representation of numbers is similar to that used in most programming languages. A number is represented in base 10 using decimal digits. It contains an integer component that may be prefixed with an optional minus sign, which may be followed by a fraction part and/or an exponent part. Leading zeros are not allowed. (...) Numeric values that cannot be represented in the grammar below (such as Infinity and NaN) are not permitted.

    This description includes both integer and floating-point numbers. However, C++ allows more precise storage if it is known whether the number is a signed integer, an unsigned integer, or a floating-point number. Therefore, three different types, number_integer_t, number_unsigned_t and number_float_t are used.

    To store floating-point numbers in C++, a type is defined by the template parameter NumberFloatType which chooses the type to use.

    "},{"location":"api/basic_json/number_float_t/#notes","title":"Notes","text":""},{"location":"api/basic_json/number_float_t/#default-type","title":"Default type","text":"

    With the default values for NumberFloatType (double), the default value for number_float_t is double.

    "},{"location":"api/basic_json/number_float_t/#default-behavior","title":"Default behavior","text":"
    • The restrictions about leading zeros are not enforced in C++. Instead, leading zeros in floating-point literals will be ignored. Internally, the value will be stored as a decimal number. For instance, the C++ floating-point literal 01.2 will be serialized to 1.2. During deserialization, leading zeros yield an error.
    • Not-a-number (NaN) values will be serialized to null.
    "},{"location":"api/basic_json/number_float_t/#limits","title":"Limits","text":"

    RFC 8259 states:

    This specification allows implementations to set limits on the range and precision of numbers accepted. Since software that implements IEEE 754-2008 binary64 (double precision) numbers is generally available and widely used, good interoperability can be achieved by implementations that expect no more precision or range than these provide, in the sense that implementations will approximate JSON numbers within the expected precision.

    This implementation does exactly follow this approach, as it uses double precision floating-point numbers. Note values smaller than -1.79769313486232e+308 and values greater than 1.79769313486232e+308 will be stored as NaN internally and be serialized to null.

    "},{"location":"api/basic_json/number_float_t/#storage","title":"Storage","text":"

    Floating-point number values are stored directly inside a basic_json type.

    "},{"location":"api/basic_json/number_float_t/#examples","title":"Examples","text":"Example

    The following code shows that number_float_t is by default, a typedef to double.

    #include <iostream>\n#include <iomanip>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    std::cout << std::boolalpha << std::is_same<double, json::number_float_t>::value << std::endl;\n}\n

    Output:

    true\n
    "},{"location":"api/basic_json/number_float_t/#version-history","title":"Version history","text":"
    • Added in version 1.0.0.
    "},{"location":"api/basic_json/number_integer_t/","title":"nlohmann::basic_json::number_integer_t","text":"
    using number_integer_t = NumberIntegerType;\n

    The type used to store JSON numbers (integers).

    RFC 8259 describes numbers as follows:

    The representation of numbers is similar to that used in most programming languages. A number is represented in base 10 using decimal digits. It contains an integer component that may be prefixed with an optional minus sign, which may be followed by a fraction part and/or an exponent part. Leading zeros are not allowed. (...) Numeric values that cannot be represented in the grammar below (such as Infinity and NaN) are not permitted.

    This description includes both integer and floating-point numbers. However, C++ allows more precise storage if it is known whether the number is a signed integer, an unsigned integer, or a floating-point number. Therefore, three different types, number_integer_t, number_unsigned_t and number_float_t are used.

    To store integer numbers in C++, a type is defined by the template parameter NumberIntegerType which chooses the type to use.

    "},{"location":"api/basic_json/number_integer_t/#notes","title":"Notes","text":""},{"location":"api/basic_json/number_integer_t/#default-type","title":"Default type","text":"

    With the default values for NumberIntegerType (std::int64_t), the default value for number_integer_t is std::int64_t.

    "},{"location":"api/basic_json/number_integer_t/#default-behavior","title":"Default behavior","text":"
    • The restrictions about leading zeros are not enforced in C++. Instead, leading zeros in integer literals lead to an interpretation as an octal number. Internally, the value will be stored as a decimal number. For instance, the C++ integer literal 010 will be serialized to 8. During deserialization, leading zeros yield an error.
    • Not-a-number (NaN) values will be serialized to null.
    "},{"location":"api/basic_json/number_integer_t/#limits","title":"Limits","text":"

    RFC 8259 specifies:

    An implementation may set limits on the range and precision of numbers.

    When the default type is used, the maximal integer number that can be stored is 9223372036854775807 (INT64_MAX) and the minimal integer number that can be stored is -9223372036854775808 (INT64_MIN). Integer numbers that are out of range will yield over/underflow when used in a constructor. During deserialization, too large or small integer numbers will automatically be stored as number_unsigned_t or number_float_t.

    RFC 8259 further states:

    Note that when such software is used, numbers that are integers and are in the range [-2^{53}+1, 2^{53}-1] are interoperable in the sense that implementations will agree exactly on their numeric values.

    As this range is a subrange of the exactly supported range [INT64_MIN, INT64_MAX], this class's integer type is interoperable.

    "},{"location":"api/basic_json/number_integer_t/#storage","title":"Storage","text":"

    Integer number values are stored directly inside a basic_json type.

    "},{"location":"api/basic_json/number_integer_t/#examples","title":"Examples","text":"Example

    The following code shows that number_integer_t is by default, a typedef to std::int64_t.

    #include <iostream>\n#include <iomanip>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    std::cout << std::boolalpha << std::is_same<std::int64_t, json::number_integer_t>::value << std::endl;\n}\n

    Output:

    true\n
    "},{"location":"api/basic_json/number_integer_t/#version-history","title":"Version history","text":"
    • Added in version 1.0.0.
    "},{"location":"api/basic_json/number_unsigned_t/","title":"nlohmann::basic_json::number_unsigned_t","text":"
    using number_unsigned_t = NumberUnsignedType;\n

    The type used to store JSON numbers (unsigned).

    RFC 8259 describes numbers as follows:

    The representation of numbers is similar to that used in most programming languages. A number is represented in base 10 using decimal digits. It contains an integer component that may be prefixed with an optional minus sign, which may be followed by a fraction part and/or an exponent part. Leading zeros are not allowed. (...) Numeric values that cannot be represented in the grammar below (such as Infinity and NaN) are not permitted.

    This description includes both integer and floating-point numbers. However, C++ allows more precise storage if it is known whether the number is a signed integer, an unsigned integer, or a floating-point number. Therefore, three different types, number_integer_t, number_unsigned_t and number_float_t are used.

    To store unsigned integer numbers in C++, a type is defined by the template parameter NumberUnsignedType which chooses the type to use.

    "},{"location":"api/basic_json/number_unsigned_t/#notes","title":"Notes","text":""},{"location":"api/basic_json/number_unsigned_t/#default-type","title":"Default type","text":"

    With the default values for NumberUnsignedType (std::uint64_t), the default value for number_unsigned_t is std::uint64_t.

    "},{"location":"api/basic_json/number_unsigned_t/#default-behavior","title":"Default behavior","text":"
    • The restrictions about leading zeros are not enforced in C++. Instead, leading zeros in integer literals lead to an interpretation as an octal number. Internally, the value will be stored as a decimal number. For instance, the C++ integer literal 010 will be serialized to 8. During deserialization, leading zeros yield an error.
    • Not-a-number (NaN) values will be serialized to null.
    "},{"location":"api/basic_json/number_unsigned_t/#limits","title":"Limits","text":"

    RFC 8259 specifies:

    An implementation may set limits on the range and precision of numbers.

    When the default type is used, the maximal integer number that can be stored is 18446744073709551615 (UINT64_MAX) and the minimal integer number that can be stored is 0. Integer numbers that are out of range will yield over/underflow when used in a constructor. During deserialization, too large or small integer numbers will automatically be stored as number_integer_t or number_float_t.

    RFC 8259 further states:

    Note that when such software is used, numbers that are integers and are in the range \\f[-2^{53}+1, 2^{53}-1]\\f are interoperable in the sense that implementations will agree exactly on their numeric values.

    As this range is a subrange (when considered in conjunction with the number_integer_t type) of the exactly supported range [0, UINT64_MAX], this class's integer type is interoperable.

    "},{"location":"api/basic_json/number_unsigned_t/#storage","title":"Storage","text":"

    Integer number values are stored directly inside a basic_json type.

    "},{"location":"api/basic_json/number_unsigned_t/#examples","title":"Examples","text":"Example

    The following code shows that number_unsigned_t is by default, a typedef to std::uint64_t.

    #include <iostream>\n#include <iomanip>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    std::cout << std::boolalpha << std::is_same<std::uint64_t, json::number_unsigned_t>::value << std::endl;\n}\n

    Output:

    true\n
    "},{"location":"api/basic_json/number_unsigned_t/#version-history","title":"Version history","text":"
    • Added in version 2.0.0.
    "},{"location":"api/basic_json/object/","title":"nlohmann::basic_json::object","text":"
    static basic_json object(initializer_list_t init = {});\n

    Creates a JSON object value from a given initializer list. The initializer lists elements must be pairs, and their first elements must be strings. If the initializer list is empty, the empty object {} is created.

    "},{"location":"api/basic_json/object/#parameters","title":"Parameters","text":"init (in) initializer list with JSON values to create an object from (optional)"},{"location":"api/basic_json/object/#return-value","title":"Return value","text":"

    JSON object value

    "},{"location":"api/basic_json/object/#exception-safety","title":"Exception safety","text":"

    Strong guarantee: if an exception is thrown, there are no changes in the JSON value.

    "},{"location":"api/basic_json/object/#exceptions","title":"Exceptions","text":"

    Throws type_error.301 if init is not a list of pairs whose first elements are strings. In this case, no object can be created. When such a value is passed to basic_json(initializer_list_t, bool, value_t), an array would have been created from the passed initializer list init. See the example below.

    "},{"location":"api/basic_json/object/#complexity","title":"Complexity","text":"

    Linear in the size of init.

    "},{"location":"api/basic_json/object/#notes","title":"Notes","text":"

    This function is only added for symmetry reasons. In contrast to the related function array(initializer_list_t), there are no cases that can only be expressed by this function. That is, any initializer list init can also be passed to the initializer list constructor basic_json(initializer_list_t, bool, value_t).

    "},{"location":"api/basic_json/object/#examples","title":"Examples","text":"Example

    The following code shows an example for the object function.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // create JSON objects\n    json j_no_init_list = json::object();\n    json j_empty_init_list = json::object({});\n    json j_list_of_pairs = json::object({ {\"one\", 1}, {\"two\", 2} });\n\n    // serialize the JSON objects\n    std::cout << j_no_init_list << '\\n';\n    std::cout << j_empty_init_list << '\\n';\n    std::cout << j_list_of_pairs << '\\n';\n\n    // example for an exception\n    try\n    {\n        // can only create an object from a list of pairs\n        json j_invalid_object = json::object({{ \"one\", 1, 2 }});\n    }\n    catch (const json::type_error& e)\n    {\n        std::cout << e.what() << '\\n';\n    }\n}\n

    Output:

    {}\n{}\n{\"one\":1,\"two\":2}\n[json.exception.type_error.301] cannot create object from initializer list\n
    "},{"location":"api/basic_json/object/#see-also","title":"See also","text":"
    • basic_json(initializer_list_t) - create a JSON value from an initializer list
    • array - create a JSON array value from an initializer list
    "},{"location":"api/basic_json/object/#version-history","title":"Version history","text":"
    • Added in version 1.0.0.
    "},{"location":"api/basic_json/object_comparator_t/","title":"nlohmann::basic_json::object_comparator_t","text":"
    using object_comparator_t = typename object_t::key_compare;\n// or\nusing object_comparator_t = default_object_comparator_t;\n

    The comparator used by object_t. Defined as typename object_t::key_compare if available, and default_object_comparator_t otherwise.

    "},{"location":"api/basic_json/object_comparator_t/#examples","title":"Examples","text":"Example

    The example below demonstrates the used object comparator.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    std::cout << std::boolalpha\n              << \"json::object_comparator_t(\\\"one\\\", \\\"two\\\") = \" << json::object_comparator_t{}(\"one\", \"two\") << \"\\n\"\n              << \"json::object_comparator_t(\\\"three\\\", \\\"four\\\") = \" << json::object_comparator_t{}(\"three\", \"four\") << std::endl;\n}\n

    Output:

    json::object_comparator_t(\"one\", \"two\") = true\njson::object_comparator_t(\"three\", \"four\") = false\n
    "},{"location":"api/basic_json/object_comparator_t/#version-history","title":"Version history","text":"
    • Added in version 3.0.0.
    • Changed to be conditionally defined as typename object_t::key_compare or default_object_comparator_t in version 3.11.0.
    "},{"location":"api/basic_json/object_t/","title":"nlohmann::basic_json::object_t","text":"
    using object_t = ObjectType<StringType,\n                            basic_json,\n                            default_object_comparator_t,\n                            AllocatorType<std::pair<const StringType, basic_json>>>;\n

    The type used to store JSON objects.

    RFC 8259 describes JSON objects as follows:

    An object is an unordered collection of zero or more name/value pairs, where a name is a string and a value is a string, number, boolean, null, object, or array.

    To store objects in C++, a type is defined by the template parameters described below.

    "},{"location":"api/basic_json/object_t/#template-parameters","title":"Template parameters","text":"ObjectType the container to store objects (e.g., std::map or std::unordered_map) StringType the type of the keys or names (e.g., std::string). The comparison function std::less<StringType> is used to order elements inside the container. AllocatorType the allocator to use for objects (e.g., std::allocator)"},{"location":"api/basic_json/object_t/#notes","title":"Notes","text":""},{"location":"api/basic_json/object_t/#default-type","title":"Default type","text":"

    With the default values for ObjectType (std::map), StringType (std::string), and AllocatorType (std::allocator), the default value for object_t is:

    // until C++14\nstd::map<\n  std::string, // key_type\n  basic_json, // value_type\n  std::less<std::string>, // key_compare\n  std::allocator<std::pair<const std::string, basic_json>> // allocator_type\n>\n\n// since C++14\nstd::map<\n  std::string, // key_type\n  basic_json, // value_type\n  std::less<>, // key_compare\n  std::allocator<std::pair<const std::string, basic_json>> // allocator_type\n>\n

    See default_object_comparator_t for more information.

    "},{"location":"api/basic_json/object_t/#behavior","title":"Behavior","text":"

    The choice of object_t influences the behavior of the JSON class. With the default type, objects have the following behavior:

    • When all names are unique, objects will be interoperable in the sense that all software implementations receiving that object will agree on the name-value mappings.
    • When the names within an object are not unique, it is unspecified which one of the values for a given key will be chosen. For instance, {\"key\": 2, \"key\": 1} could be equal to either {\"key\": 1} or {\"key\": 2}.
    • Internally, name/value pairs are stored in lexicographical order of the names. Objects will also be serialized (see dump) in this order. For instance, {\"b\": 1, \"a\": 2} and {\"a\": 2, \"b\": 1} will be stored and serialized as {\"a\": 2, \"b\": 1}.
    • When comparing objects, the order of the name/value pairs is irrelevant. This makes objects interoperable in the sense that they will not be affected by these differences. For instance, {\"b\": 1, \"a\": 2} and {\"a\": 2, \"b\": 1} will be treated as equal.
    "},{"location":"api/basic_json/object_t/#limits","title":"Limits","text":"

    RFC 8259 specifies:

    An implementation may set limits on the maximum depth of nesting.

    In this class, the object's limit of nesting is not explicitly constrained. However, a maximum depth of nesting may be introduced by the compiler or runtime environment. A theoretical limit can be queried by calling the max_size function of a JSON object.

    "},{"location":"api/basic_json/object_t/#storage","title":"Storage","text":"

    Objects are stored as pointers in a basic_json type. That is, for any access to object values, a pointer of type object_t* must be dereferenced.

    "},{"location":"api/basic_json/object_t/#object-key-order","title":"Object key order","text":"

    The order name/value pairs are added to the object are not preserved by the library. Therefore, iterating an object may return name/value pairs in a different order than they were originally stored. In fact, keys will be traversed in alphabetical order as std::map with std::less is used by default. Please note this behavior conforms to RFC 8259, because any order implements the specified \"unordered\" nature of JSON objects.

    "},{"location":"api/basic_json/object_t/#examples","title":"Examples","text":"Example

    The following code shows that object_t is by default, a typedef to std::map<json::string_t, json>.

    #include <iostream>\n#include <iomanip>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    std::cout << std::boolalpha << std::is_same<std::map<json::string_t, json>, json::object_t>::value << std::endl;\n}\n

    Output:

    true\n
    "},{"location":"api/basic_json/object_t/#version-history","title":"Version history","text":"
    • Added in version 1.0.0.
    "},{"location":"api/basic_json/operator%2B%3D/","title":"nlohmann::basic_json::operator+=","text":"
    // (1)\nreference operator+=(basic_json&& val);\nreference operator+=(const basic_json& val);\n\n// (2)\nreference operator+=(const typename object_t::value_type& val);\n\n// (3)\nreference operator+=(initializer_list_t init);\n

    1. Appends the given element val to the end of the JSON array. If the function is called on a JSON null value, an empty array is created before appending val.

    2. Inserts the given element val to the JSON object. If the function is called on a JSON null value, an empty object is created before inserting val.

    3. This function allows using operator+= with an initializer list. In case

      1. the current value is an object,
      2. the initializer list init contains only two elements, and
      3. the first element of init is a string,

      init is converted into an object element and added using operator+=(const typename object_t::value_type&). Otherwise, init is converted to a JSON value and added using operator+=(basic_json&&).

    "},{"location":"api/basic_json/operator%2B%3D/#iterator-invalidation","title":"Iterator invalidation","text":"

    For all cases where an element is added to an array, a reallocation can happen, in which case all iterators (including the end() iterator) and all references to the elements are invalidated. Otherwise, only the end() iterator is invalidated.

    For ordered_json, also adding an element to an object can yield a reallocation which again invalidates all iterators and all references.

    "},{"location":"api/basic_json/operator%2B%3D/#parameters","title":"Parameters","text":"val (in) the value to add to the JSON array/object init (in) an initializer list"},{"location":"api/basic_json/operator%2B%3D/#return-value","title":"Return value","text":"

    *this

    "},{"location":"api/basic_json/operator%2B%3D/#exceptions","title":"Exceptions","text":"

    All functions can throw the following exception: - Throws type_error.308 when called on a type other than JSON array or null; example: \"cannot use operator+=() with number\"

    "},{"location":"api/basic_json/operator%2B%3D/#complexity","title":"Complexity","text":"
    1. Amortized constant.
    2. Logarithmic in the size of the container, O(log(size())).
    3. Linear in the size of the initializer list init.
    "},{"location":"api/basic_json/operator%2B%3D/#notes","title":"Notes","text":"

    (3) This function is required to resolve an ambiguous overload error, because pairs like {\"key\", \"value\"} can be both interpreted as object_t::value_type or std::initializer_list<basic_json>, see #235 for more information.

    "},{"location":"api/basic_json/operator%2B%3D/#examples","title":"Examples","text":"Example: (1) add element to array

    The example shows how push_back() and += can be used to add elements to a JSON array. Note how the null value was silently converted to a JSON array.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // create JSON values\n    json array = {1, 2, 3, 4, 5};\n    json null;\n\n    // print values\n    std::cout << array << '\\n';\n    std::cout << null << '\\n';\n\n    // add values\n    array.push_back(6);\n    array += 7;\n    null += \"first\";\n    null += \"second\";\n\n    // print values\n    std::cout << array << '\\n';\n    std::cout << null << '\\n';\n}\n

    Output:

    [1,2,3,4,5]\nnull\n[1,2,3,4,5,6,7]\n[\"first\",\"second\"]\n
    Example: (2) add element to object

    The example shows how push_back() and += can be used to add elements to a JSON object. Note how the null value was silently converted to a JSON object.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // create JSON values\n    json object = {{\"one\", 1}, {\"two\", 2}};\n    json null;\n\n    // print values\n    std::cout << object << '\\n';\n    std::cout << null << '\\n';\n\n    // add values\n    object.push_back(json::object_t::value_type(\"three\", 3));\n    object += json::object_t::value_type(\"four\", 4);\n    null += json::object_t::value_type(\"A\", \"a\");\n    null += json::object_t::value_type(\"B\", \"b\");\n\n    // print values\n    std::cout << object << '\\n';\n    std::cout << null << '\\n';\n}\n

    Output:

    {\"one\":1,\"two\":2}\nnull\n{\"four\":4,\"one\":1,\"three\":3,\"two\":2}\n{\"A\":\"a\",\"B\":\"b\"}\n
    Example: (3) add to object from initializer list

    The example shows how initializer lists are treated as objects when possible.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // create JSON values\n    json object = {{\"one\", 1}, {\"two\", 2}};\n    json null;\n\n    // print values\n    std::cout << object << '\\n';\n    std::cout << null << '\\n';\n\n    // add values:\n    object.push_back({\"three\", 3});  // object is extended\n    object += {\"four\", 4};           // object is extended\n    null.push_back({\"five\", 5});     // null is converted to array\n\n    // print values\n    std::cout << object << '\\n';\n    std::cout << null << '\\n';\n\n    // would throw:\n    //object.push_back({1, 2, 3});\n}\n

    Output:

    {\"one\":1,\"two\":2}\nnull\n{\"four\":4,\"one\":1,\"three\":3,\"two\":2}\n[[\"five\",5]]\n
    "},{"location":"api/basic_json/operator%2B%3D/#see-also","title":"See also","text":"
    • emplace_back add a value to an array
    • push_back add a value to an array/object
    "},{"location":"api/basic_json/operator%2B%3D/#version-history","title":"Version history","text":"
    1. Since version 1.0.0.
    2. Since version 1.0.0.
    3. Since version 2.0.0.
    "},{"location":"api/basic_json/operator%3D/","title":"nlohmann::basic_json::operator=","text":"
    basic_json& operator=(basic_json other) noexcept (\n    std::is_nothrow_move_constructible<value_t>::value &&\n    std::is_nothrow_move_assignable<value_t>::value &&\n    std::is_nothrow_move_constructible<json_value>::value &&\n    std::is_nothrow_move_assignable<json_value>::value\n);\n

    Copy assignment operator. Copies a JSON value via the \"copy and swap\" strategy: It is expressed in terms of the copy constructor, destructor, and the swap() member function.

    "},{"location":"api/basic_json/operator%3D/#parameters","title":"Parameters","text":"other (in) value to copy from"},{"location":"api/basic_json/operator%3D/#complexity","title":"Complexity","text":"

    Linear.

    "},{"location":"api/basic_json/operator%3D/#examples","title":"Examples","text":"Example

    The code below shows and example for the copy assignment. It creates a copy of value a which is then swapped with b. Finally, the copy of a (which is the null value after the swap) is destroyed.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // create JSON values\n    json a = 23;\n    json b = 42;\n\n    // copy-assign a to b\n    b = a;\n\n    // serialize the JSON arrays\n    std::cout << a << '\\n';\n    std::cout << b << '\\n';\n}\n

    Output:

    23\n23\n
    "},{"location":"api/basic_json/operator%3D/#version-history","title":"Version history","text":"
    • Added in version 1.0.0.
    "},{"location":"api/basic_json/operator%5B%5D/","title":"nlohmann::basic_json::operator[]","text":"
    // (1)\nreference operator[](size_type idx);\nconst_reference operator[](size_type idx) const;\n\n// (2)\nreference operator[](typename object_t::key_type key);\nconst_reference operator[](const typename object_t::key_type& key) const;\n\n// (3)\ntemplate<typename KeyType>\nreference operator[](KeyType&& key);\ntemplate<typename KeyType>\nconst_reference operator[](KeyType&& key) const;\n\n// (4)\nreference operator[](const json_pointer& ptr);\nconst_reference operator[](const json_pointer& ptr) const;\n
    1. Returns a reference to the array element at specified location idx.
    2. Returns a reference to the object element with specified key key. The non-const qualified overload takes the key by value.
    3. See 2. This overload is only available if KeyType is comparable with typename object_t::key_type and typename object_comparator_t::is_transparent denotes a type.
    4. Returns a reference to the element with specified JSON pointer ptr.
    "},{"location":"api/basic_json/operator%5B%5D/#template-parameters","title":"Template parameters","text":"KeyType A type for an object key other than json_pointer that is comparable with string_t using object_comparator_t. This can also be a string view (C++17)."},{"location":"api/basic_json/operator%5B%5D/#iterator-invalidation","title":"Iterator invalidation","text":"

    For the non-const versions 1. and 4., when passing an array index that does not exist, it is created and filled with a null value before a reference to it is returned. For this, a reallocation can happen, in which case all iterators (including the end() iterator) and all references to the elements are invalidated.

    For ordered_json, also passing an object key to the non-const versions 2., 3., and 4., a reallocation can happen which again invalidates all iterators and all references.

    "},{"location":"api/basic_json/operator%5B%5D/#parameters","title":"Parameters","text":"idx (in) index of the element to access key (in) object key of the element to access ptr (in) JSON pointer to the desired element"},{"location":"api/basic_json/operator%5B%5D/#return-value","title":"Return value","text":"
    1. (const) reference to the element at index idx
    2. (const) reference to the element at key key
    3. (const) reference to the element at key key
    4. (const) reference to the element pointed to by ptr
    "},{"location":"api/basic_json/operator%5B%5D/#exception-safety","title":"Exception safety","text":"

    Strong exception safety: if an exception occurs, the original value stays intact.

    "},{"location":"api/basic_json/operator%5B%5D/#exceptions","title":"Exceptions","text":"
    1. The function can throw the following exceptions:
      • Throws type_error.305 if the JSON value is not an array or null; in that case, using the [] operator with an index makes no sense.
    2. The function can throw the following exceptions:
      • Throws type_error.305 if the JSON value is not an object or null; in that case, using the [] operator with a key makes no sense.
    3. See 2.
    4. The function can throw the following exceptions:
      • Throws parse_error.106 if an array index in the passed JSON pointer ptr begins with '0'.
      • Throws parse_error.109 if an array index in the passed JSON pointer ptr is not a number.
      • Throws out_of_range.402 if the array index '-' is used in the passed JSON pointer ptr for the const version.
      • Throws out_of_range.404 if the JSON pointer ptr can not be resolved.
    "},{"location":"api/basic_json/operator%5B%5D/#complexity","title":"Complexity","text":"
    1. Constant if idx is in the range of the array. Otherwise, linear in idx - size().
    2. Logarithmic in the size of the container.
    3. Logarithmic in the size of the container.
    4. Logarithmic in the size of the container.
    "},{"location":"api/basic_json/operator%5B%5D/#notes","title":"Notes","text":"

    Undefined behavior and runtime assertions

    1. If the element with key idx does not exist, the behavior is undefined.
    2. If the element with key key does not exist, the behavior is undefined and is guarded by a runtime assertion!

    1. The non-const version may add values: If idx is beyond the range of the array (i.e., idx >= size()), then the array is silently filled up with null values to make idx a valid reference to the last stored element. In case the value was null before, it is converted to an array.

    2. If key is not found in the object, then it is silently added to the object and filled with a null value to make key a valid reference. In case the value was null before, it is converted to an object.

    3. See 2.

    4. null values are created in arrays and objects if necessary.

      In particular:

      • If the JSON pointer points to an object key that does not exist, it is created and filled with a null value before a reference to it is returned.
      • If the JSON pointer points to an array index that does not exist, it is created and filled with a null value before a reference to it is returned. All indices between the current maximum and the given index are also filled with null.
      • The special value - is treated as a synonym for the index past the end.
    "},{"location":"api/basic_json/operator%5B%5D/#examples","title":"Examples","text":"Example: (1) access specified array element

    The example below shows how array elements can be read and written using [] operator. Note the addition of null values.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // create a JSON array\n    json array = {1, 2, 3, 4, 5};\n\n    // output element at index 3 (fourth element)\n    std::cout << array[3] << '\\n';\n\n    // change last element to 6\n    array[array.size() - 1] = 6;\n\n    // output changed array\n    std::cout << array << '\\n';\n\n    // write beyond array limit\n    array[10] = 11;\n\n    // output changed array\n    std::cout << array << '\\n';\n}\n

    Output:

    4\n[1,2,3,4,6]\n[1,2,3,4,6,null,null,null,null,null,11]\n
    Example: (1) access specified array element (const)

    The example below shows how array elements can be read using the [] operator.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // create JSON array\n    const json array = {\"first\", \"2nd\", \"third\", \"fourth\"};\n\n    // output element at index 2 (third element)\n    std::cout << array.at(2) << '\\n';\n}\n

    Output:

    \"third\"\n
    Example: (2) access specified object element

    The example below shows how object elements can be read and written using the [] operator.

    #include <iostream>\n#include <iomanip>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // create a JSON object\n    json object =\n    {\n        {\"one\", 1}, {\"two\", 2}, {\"three\", 2.9}\n    };\n\n    // output element with key \"two\"\n    std::cout << object[\"two\"] << \"\\n\\n\";\n\n    // change element with key \"three\"\n    object[\"three\"] = 3;\n\n    // output changed array\n    std::cout << std::setw(4) << object << \"\\n\\n\";\n\n    // mention nonexisting key\n    object[\"four\"];\n\n    // write to nonexisting key\n    object[\"five\"][\"really\"][\"nested\"] = true;\n\n    // output changed object\n    std::cout << std::setw(4) << object << '\\n';\n}\n

    Output:

    2\n\n{\n    \"one\": 1,\n    \"three\": 3,\n    \"two\": 2\n}\n\n{\n    \"five\": {\n        \"really\": {\n            \"nested\": true\n        }\n    },\n    \"four\": null,\n    \"one\": 1,\n    \"three\": 3,\n    \"two\": 2\n}\n
    Example: (2) access specified object element (const)

    The example below shows how object elements can be read using the [] operator.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // create a JSON object\n    const json object =\n    {\n        {\"one\", 1}, {\"two\", 2}, {\"three\", 2.9}\n    };\n\n    // output element with key \"two\"\n    std::cout << object[\"two\"] << '\\n';\n}\n

    Output:

    2\n
    Example: (3) access specified object element using string_view

    The example below shows how object elements can be read using the [] operator.

    #include <iostream>\n#include <iomanip>\n#include <string_view>\n#include <nlohmann/json.hpp>\n\nusing namespace std::string_view_literals;\nusing json = nlohmann::json;\n\nint main()\n{\n    // create a JSON object\n    json object =\n    {\n        {\"one\", 1}, {\"two\", 2}, {\"three\", 2.9}\n    };\n\n    // output element with key \"two\"\n    std::cout << object[\"two\"sv] << \"\\n\\n\";\n\n    // change element with key \"three\"\n    object[\"three\"sv] = 3;\n\n    // output changed array\n    std::cout << std::setw(4) << object << \"\\n\\n\";\n\n    // mention nonexisting key\n    object[\"four\"sv];\n\n    // write to nonexisting key\n    object[\"five\"sv][\"really\"sv][\"nested\"sv] = true;\n\n    // output changed object\n    std::cout << std::setw(4) << object << '\\n';\n}\n

    Output:

    2\n\n{\n    \"one\": 1,\n    \"three\": 3,\n    \"two\": 2\n}\n\n{\n    \"five\": {\n        \"really\": {\n            \"nested\": true\n        }\n    },\n    \"four\": null,\n    \"one\": 1,\n    \"three\": 3,\n    \"two\": 2\n}\n
    Example: (3) access specified object element using string_view (const)

    The example below shows how object elements can be read using the [] operator.

    #include <iostream>\n#include <string_view>\n#include <nlohmann/json.hpp>\n\nusing namespace std::string_view_literals;\nusing json = nlohmann::json;\n\nint main()\n{\n    // create a JSON object\n    const json object =\n    {\n        {\"one\", 1}, {\"two\", 2}, {\"three\", 2.9}\n    };\n\n    // output element with key \"two\"\n    std::cout << object[\"two\"sv] << '\\n';\n}\n

    Output:

    2\n
    Example: (4) access specified element via JSON Pointer

    The example below shows how values can be read and written using JSON Pointers.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\nusing namespace nlohmann::literals;\n\nint main()\n{\n    // create a JSON value\n    json j =\n    {\n        {\"number\", 1}, {\"string\", \"foo\"}, {\"array\", {1, 2}}\n    };\n\n    // read-only access\n\n    // output element with JSON pointer \"/number\"\n    std::cout << j[\"/number\"_json_pointer] << '\\n';\n    // output element with JSON pointer \"/string\"\n    std::cout << j[\"/string\"_json_pointer] << '\\n';\n    // output element with JSON pointer \"/array\"\n    std::cout << j[\"/array\"_json_pointer] << '\\n';\n    // output element with JSON pointer \"/array/1\"\n    std::cout << j[\"/array/1\"_json_pointer] << '\\n';\n\n    // writing access\n\n    // change the string\n    j[\"/string\"_json_pointer] = \"bar\";\n    // output the changed string\n    std::cout << j[\"string\"] << '\\n';\n\n    // \"change\" a nonexisting object entry\n    j[\"/boolean\"_json_pointer] = true;\n    // output the changed object\n    std::cout << j << '\\n';\n\n    // change an array element\n    j[\"/array/1\"_json_pointer] = 21;\n    // \"change\" an array element with nonexisting index\n    j[\"/array/4\"_json_pointer] = 44;\n    // output the changed array\n    std::cout << j[\"array\"] << '\\n';\n\n    // \"change\" the array element past the end\n    j[\"/array/-\"_json_pointer] = 55;\n    // output the changed array\n    std::cout << j[\"array\"] << '\\n';\n}\n

    Output:

    1\n\"foo\"\n[1,2]\n2\n\"bar\"\n{\"array\":[1,2],\"boolean\":true,\"number\":1,\"string\":\"bar\"}\n[1,21,null,null,44]\n[1,21,null,null,44,55]\n
    Example: (4) access specified element via JSON Pointer (const)

    The example below shows how values can be read using JSON Pointers.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\nusing namespace nlohmann::literals;\n\nint main()\n{\n    // create a JSON value\n    const json j =\n    {\n        {\"number\", 1}, {\"string\", \"foo\"}, {\"array\", {1, 2}}\n    };\n\n    // read-only access\n\n    // output element with JSON pointer \"/number\"\n    std::cout << j[\"/number\"_json_pointer] << '\\n';\n    // output element with JSON pointer \"/string\"\n    std::cout << j[\"/string\"_json_pointer] << '\\n';\n    // output element with JSON pointer \"/array\"\n    std::cout << j[\"/array\"_json_pointer] << '\\n';\n    // output element with JSON pointer \"/array/1\"\n    std::cout << j[\"/array/1\"_json_pointer] << '\\n';\n}\n

    Output:

    1\n\"foo\"\n[1,2]\n2\n
    "},{"location":"api/basic_json/operator%5B%5D/#see-also","title":"See also","text":"
    • documentation on unchecked access
    • documentation on runtime assertions
    • see at for access by reference with range checking
    • see value for access with default value
    "},{"location":"api/basic_json/operator%5B%5D/#version-history","title":"Version history","text":"
    1. Added in version 1.0.0.
    2. Added in version 1.0.0. Added overloads for T* key in version 1.1.0. Removed overloads for T* key (replaced by 3) in version 3.11.0.
    3. Added in version 3.11.0.
    4. Added in version 2.0.0.
    "},{"location":"api/basic_json/operator_ValueType/","title":"nlohmann::basic_json::operator ValueType","text":"
    template<typename ValueType>\nJSON_EXPLICIT operator ValueType() const;\n

    Implicit type conversion between the JSON value and a compatible value. The call is realized by calling get(). See Notes for the meaning of JSON_EXPLICIT.

    "},{"location":"api/basic_json/operator_ValueType/#template-parameters","title":"Template parameters","text":"ValueType the value type to return"},{"location":"api/basic_json/operator_ValueType/#return-value","title":"Return value","text":"

    copy of the JSON value, converted to ValueType

    "},{"location":"api/basic_json/operator_ValueType/#exceptions","title":"Exceptions","text":"

    Depends on what json_serializer<ValueType> from_json() method throws

    "},{"location":"api/basic_json/operator_ValueType/#complexity","title":"Complexity","text":"

    Linear in the size of the JSON value.

    "},{"location":"api/basic_json/operator_ValueType/#notes","title":"Notes","text":"

    Definition of JSON_EXPLICIT

    By default JSON_EXPLICIT is defined to the empty string, so the signature is:

    template<typename ValueType>\noperator ValueType() const;\n

    If JSON_USE_IMPLICIT_CONVERSIONS is set to 0, JSON_EXPLICIT is defined to explicit:

    template<typename ValueType>\nexplicit operator ValueType() const;\n

    That is, implicit conversions can be switched off by defining JSON_USE_IMPLICIT_CONVERSIONS to 0.

    Future behavior change

    Implicit conversions will be switched off by default in the next major release of the library. That is, JSON_EXPLICIT will be set to explicit by default.

    You can prepare existing code by already defining JSON_USE_IMPLICIT_CONVERSIONS to 0 and replace any implicit conversions with calls to get.

    "},{"location":"api/basic_json/operator_ValueType/#examples","title":"Examples","text":"Example

    The example below shows several conversions from JSON values to other types. There are a few things to note: (1) Floating-point numbers can be converted to integers, (2) A JSON array can be converted to a standard std::vector<short>, (3) A JSON object can be converted to C++ associative containers such as std::unordered_map<std::string, json>.

    #include <iostream>\n#include <unordered_map>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // create a JSON value with different types\n    json json_types =\n    {\n        {\"boolean\", true},\n        {\n            \"number\", {\n                {\"integer\", 42},\n                {\"floating-point\", 17.23}\n            }\n        },\n        {\"string\", \"Hello, world!\"},\n        {\"array\", {1, 2, 3, 4, 5}},\n        {\"null\", nullptr}\n    };\n\n    // use implicit conversions\n    bool v1 = json_types[\"boolean\"];\n    int v2 = json_types[\"number\"][\"integer\"];\n    short v3 = json_types[\"number\"][\"integer\"];\n    float v4 = json_types[\"number\"][\"floating-point\"];\n    int v5 = json_types[\"number\"][\"floating-point\"];\n    std::string v6 = json_types[\"string\"];\n    std::vector<short> v7 = json_types[\"array\"];\n    std::unordered_map<std::string, json> v8 = json_types;\n\n    // print the conversion results\n    std::cout << v1 << '\\n';\n    std::cout << v2 << ' ' << v3 << '\\n';\n    std::cout << v4 << ' ' << v5 << '\\n';\n    std::cout << v6 << '\\n';\n\n    for (auto i : v7)\n    {\n        std::cout << i << ' ';\n    }\n    std::cout << \"\\n\\n\";\n\n    for (auto i : v8)\n    {\n        std::cout << i.first << \": \" << i.second << '\\n';\n    }\n\n    // example for an exception\n    try\n    {\n        bool v1 = json_types[\"string\"];\n    }\n    catch (const json::type_error& e)\n    {\n        std::cout << e.what() << '\\n';\n    }\n}\n

    Output:

    1\n42 42\n17.23 17\nHello, world!\n1 2 3 4 5 \n\nstring: \"Hello, world!\"\nnumber: {\"floating-point\":17.23,\"integer\":42}\nnull: null\nboolean: true\narray: [1,2,3,4,5]\n[json.exception.type_error.302] type must be boolean, but is string\n
    "},{"location":"api/basic_json/operator_ValueType/#version-history","title":"Version history","text":"
    • Since version 1.0.0.
    • Macros JSON_EXPLICIT/JSON_USE_IMPLICIT_CONVERSIONS added in version 3.9.0.
    "},{"location":"api/basic_json/operator_eq/","title":"nlohmann::basic_json::operator==","text":"
    // until C++20\nbool operator==(const_reference lhs, const_reference rhs) noexcept;   // (1)\n\ntemplate<typename ScalarType>\nbool operator==(const_reference lhs, const ScalarType rhs) noexcept;  // (2)\n\ntemplate<typename ScalarType>\nbool operator==(ScalarType lhs, const const_reference rhs) noexcept;  // (2)\n\n// since C++20\nclass basic_json {\n    bool operator==(const_reference rhs) const noexcept;              // (1)\n\n    template<typename ScalarType>\n    bool operator==(ScalarType rhs) const noexcept;                   // (2)\n};\n

    1. Compares two JSON values for equality according to the following rules:

      • Two JSON values are equal if (1) neither value is discarded, or (2) they are of the same type and their stored values are the same according to their respective operator==.
      • Integer and floating-point numbers are automatically converted before comparison.

    2. Compares a JSON value and a scalar or a scalar and a JSON value for equality by converting the scalar to a JSON value and comparing both JSON values according to 1.

    "},{"location":"api/basic_json/operator_eq/#template-parameters","title":"Template parameters","text":"ScalarType a scalar type according to std::is_scalar<ScalarType>::value"},{"location":"api/basic_json/operator_eq/#parameters","title":"Parameters","text":"lhs (in) first value to consider rhs (in) second value to consider"},{"location":"api/basic_json/operator_eq/#return-value","title":"Return value","text":"

    whether the values lhs/*this and rhs are equal

    "},{"location":"api/basic_json/operator_eq/#exception-safety","title":"Exception safety","text":"

    No-throw guarantee: this function never throws exceptions.

    "},{"location":"api/basic_json/operator_eq/#complexity","title":"Complexity","text":"

    Linear.

    "},{"location":"api/basic_json/operator_eq/#notes","title":"Notes","text":"

    Comparing special values

    • NaN values are unordered within the domain of numbers. The following comparisons all yield false:
      1. Comparing a NaN with itself.
      2. Comparing a NaN with another NaN.
      3. Comparing a NaN and any other number.
    • JSON null values are all equal.
    • Discarded values never compare equal to themselves.

    Comparing floating-point numbers

    Floating-point numbers inside JSON values numbers are compared with json::number_float_t::operator== which is double::operator== by default. To compare floating-point while respecting an epsilon, an alternative comparison function could be used, for instance

    template<typename T, typename = typename std::enable_if<std::is_floating_point<T>::value, T>::type>\ninline bool is_same(T a, T b, T epsilon = std::numeric_limits<T>::epsilon()) noexcept\n{\n    return std::abs(a - b) <= epsilon;\n}\n

    Or you can self-defined operator equal function like this:

    bool my_equal(const_reference lhs, const_reference rhs)\n{\n    const auto lhs_type lhs.type();\n    const auto rhs_type rhs.type();\n    if (lhs_type == rhs_type)\n    {\n        switch(lhs_type)\n            // self_defined case\n            case value_t::number_float:\n                return std::abs(lhs - rhs) <= std::numeric_limits<float>::epsilon();\n            // other cases remain the same with the original\n            ...\n    }\n...\n}\n

    Comparing different basic_json specializations

    Comparing different basic_json specializations can have surprising effects. For instance, the result of comparing the JSON objects

    {\n   \"version\": 1,\n   \"type\": \"integer\"\n}\n

    and

    {\n   \"type\": \"integer\",\n   \"version\": 1\n}\n

    depends on whether nlohmann::json or nlohmann::ordered_json is used:

    #include <iostream>\n#include <iomanip>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    nlohmann::json uj1 = {{\"version\", 1}, {\"type\", \"integer\"}};\n    nlohmann::json uj2 = {{\"type\", \"integer\"}, {\"version\", 1}};\n\n    nlohmann::ordered_json oj1 = {{\"version\", 1}, {\"type\", \"integer\"}};\n    nlohmann::ordered_json oj2 = {{\"type\", \"integer\"}, {\"version\", 1}};\n\n    std::cout << std::boolalpha << (uj1 == uj2) << '\\n' << (oj1 == oj2) << std::endl;\n}\n

    Output:

    true\nfalse\n
    "},{"location":"api/basic_json/operator_eq/#examples","title":"Examples","text":"Example

    The example demonstrates comparing several JSON types.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // create several JSON values\n    json array_1 = {1, 2, 3};\n    json array_2 = {1, 2, 4};\n    json object_1 = {{\"A\", \"a\"}, {\"B\", \"b\"}};\n    json object_2 = {{\"B\", \"b\"}, {\"A\", \"a\"}};\n    json number_1 = 17;\n    json number_2 = 17.000000000000001L;\n    json string_1 = \"foo\";\n    json string_2 = \"bar\";\n\n    // output values and comparisons\n    std::cout << std::boolalpha;\n    std::cout << array_1 << \" == \" << array_2 << \" \" << (array_1 == array_2) << '\\n';\n    std::cout << object_1 << \" == \" << object_2 << \" \" << (object_1 == object_2) << '\\n';\n    std::cout << number_1 << \" == \" << number_2 << \" \" << (number_1 == number_2) << '\\n';\n    std::cout << string_1 << \" == \" << string_2 << \" \" << (string_1 == string_2) << '\\n';\n}\n

    Output:

    [1,2,3] == [1,2,4] false\n{\"A\":\"a\",\"B\":\"b\"} == {\"A\":\"a\",\"B\":\"b\"} true\n17 == 17.0 true\n\"foo\" == \"bar\" false\n
    Example

    The example demonstrates comparing several JSON types against the null pointer (JSON null).

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // create several JSON values\n    json array = {1, 2, 3};\n    json object = {{\"A\", \"a\"}, {\"B\", \"b\"}};\n    json number = 17;\n    json string = \"foo\";\n    json null;\n\n    // output values and comparisons\n    std::cout << std::boolalpha;\n    std::cout << array << \" == nullptr \" << (array == nullptr) << '\\n';\n    std::cout << object << \" == nullptr \" << (object == nullptr) << '\\n';\n    std::cout << number << \" == nullptr \" << (number == nullptr) << '\\n';\n    std::cout << string << \" == nullptr \" << (string == nullptr) << '\\n';\n    std::cout << null << \" == nullptr \" << (null == nullptr) << '\\n';\n}\n

    Output:

    [1,2,3] == nullptr false\n{\"A\":\"a\",\"B\":\"b\"} == nullptr false\n17 == nullptr false\n\"foo\" == nullptr false\nnull == nullptr true\n
    "},{"location":"api/basic_json/operator_eq/#version-history","title":"Version history","text":"
    1. Added in version 1.0.0. Added C++20 member functions in version 3.11.0.
    2. Added in version 1.0.0. Added C++20 member functions in version 3.11.0.
    "},{"location":"api/basic_json/operator_ge/","title":"nlohmann::basic_json::operator>=","text":"
    // until C++20\nbool operator>=(const_reference lhs, const_reference rhs) noexcept;   // (1)\n\ntemplate<typename ScalarType>\nbool operator>=(const_reference lhs, const ScalarType rhs) noexcept;  // (2)\n\ntemplate<typename ScalarType>\nbool operator>=(ScalarType lhs, const const_reference rhs) noexcept;  // (2)\n

    1. Compares whether one JSON value lhs is greater than or equal to another JSON value rhs according to the following rules:

      • The comparison always yields false if (1) either operand is discarded, or (2) either operand is NaN and the other operand is either NaN or any other number.
      • Otherwise, returns the result of !(lhs < rhs) (see operator<).

    2. Compares whether a JSON value is greater than or equal to a scalar or a scalar is greater than or equal to a JSON value by converting the scalar to a JSON value and comparing both JSON values according to 1.

    "},{"location":"api/basic_json/operator_ge/#template-parameters","title":"Template parameters","text":"ScalarType a scalar type according to std::is_scalar<ScalarType>::value"},{"location":"api/basic_json/operator_ge/#parameters","title":"Parameters","text":"lhs (in) first value to consider rhs (in) second value to consider"},{"location":"api/basic_json/operator_ge/#return-value","title":"Return value","text":"

    whether lhs is less than or equal to rhs

    "},{"location":"api/basic_json/operator_ge/#exception-safety","title":"Exception safety","text":"

    No-throw guarantee: this function never throws exceptions.

    "},{"location":"api/basic_json/operator_ge/#complexity","title":"Complexity","text":"

    Linear.

    "},{"location":"api/basic_json/operator_ge/#notes","title":"Notes","text":"

    Comparing NaN

    NaN values are unordered within the domain of numbers. The following comparisons all yield false: 1. Comparing a NaN with itself. 2. Comparing a NaN with another NaN. 3. Comparing a NaN and any other number.

    Operator overload resolution

    Since C++20 overload resolution will consider the rewritten candidate generated from operator<=>.

    "},{"location":"api/basic_json/operator_ge/#examples","title":"Examples","text":"Example

    The example demonstrates comparing several JSON types.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // create several JSON values\n    json array_1 = {1, 2, 3};\n    json array_2 = {1, 2, 4};\n    json object_1 = {{\"A\", \"a\"}, {\"B\", \"b\"}};\n    json object_2 = {{\"B\", \"b\"}, {\"A\", \"a\"}};\n    json number_1 = 17;\n    json number_2 = 17.0000000000001L;\n    json string_1 = \"foo\";\n    json string_2 = \"bar\";\n\n    // output values and comparisons\n    std::cout << std::boolalpha;\n    std::cout << array_1 << \" >= \" << array_2 << \" \" << (array_1 >= array_2) << '\\n';\n    std::cout << object_1 << \" >= \" << object_2 << \" \" << (object_1 >= object_2) << '\\n';\n    std::cout << number_1 << \" >= \" << number_2 << \" \" << (number_1 >= number_2) << '\\n';\n    std::cout << string_1 << \" >= \" << string_2 << \" \" << (string_1 >= string_2) << '\\n';\n}\n

    Output:

    [1,2,3] >= [1,2,4] false\n{\"A\":\"a\",\"B\":\"b\"} >= {\"A\":\"a\",\"B\":\"b\"} true\n17 >= 17.0000000000001 false\n\"foo\" >= \"bar\" true\n
    "},{"location":"api/basic_json/operator_ge/#see-also","title":"See also","text":"
    • operator<=> comparison: 3-way
    "},{"location":"api/basic_json/operator_ge/#version-history","title":"Version history","text":"
    1. Added in version 1.0.0. Conditionally removed since C++20 in version 3.11.0.
    2. Added in version 1.0.0. Conditionally removed since C++20 in version 3.11.0.
    "},{"location":"api/basic_json/operator_gt/","title":"nlohmann::basic_json::operator>","text":"
    // until C++20\nbool operator>(const_reference lhs, const_reference rhs) noexcept;   // (1)\n\ntemplate<typename ScalarType>\nbool operator>(const_reference lhs, const ScalarType rhs) noexcept;  // (2)\n\ntemplate<typename ScalarType>\nbool operator>(ScalarType lhs, const const_reference rhs) noexcept;  // (2)\n

    1. Compares whether one JSON value lhs is greater than another JSON value rhs according to the following rules:

      • The comparison always yields false if (1) either operand is discarded, or (2) either operand is NaN and the other operand is either NaN or any other number.
      • Otherwise, returns the result of !(lhs <= rhs) (see operator<=).

    2. Compares whether a JSON value is greater than a scalar or a scalar is greater than a JSON value by converting the scalar to a JSON value and comparing both JSON values according to 1.

    "},{"location":"api/basic_json/operator_gt/#template-parameters","title":"Template parameters","text":"ScalarType a scalar type according to std::is_scalar<ScalarType>::value"},{"location":"api/basic_json/operator_gt/#parameters","title":"Parameters","text":"lhs (in) first value to consider rhs (in) second value to consider"},{"location":"api/basic_json/operator_gt/#return-value","title":"Return value","text":"

    whether lhs is greater than rhs

    "},{"location":"api/basic_json/operator_gt/#exception-safety","title":"Exception safety","text":"

    No-throw guarantee: this function never throws exceptions.

    "},{"location":"api/basic_json/operator_gt/#complexity","title":"Complexity","text":"

    Linear.

    "},{"location":"api/basic_json/operator_gt/#notes","title":"Notes","text":"

    Comparing NaN

    NaN values are unordered within the domain of numbers. The following comparisons all yield false: 1. Comparing a NaN with itself. 2. Comparing a NaN with another NaN. 3. Comparing a NaN and any other number.

    Operator overload resolution

    Since C++20 overload resolution will consider the rewritten candidate generated from operator<=>.

    "},{"location":"api/basic_json/operator_gt/#examples","title":"Examples","text":"Example

    The example demonstrates comparing several JSON types.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // create several JSON values\n    json array_1 = {1, 2, 3};\n    json array_2 = {1, 2, 4};\n    json object_1 = {{\"A\", \"a\"}, {\"B\", \"b\"}};\n    json object_2 = {{\"B\", \"b\"}, {\"A\", \"a\"}};\n    json number_1 = 17;\n    json number_2 = 17.0000000000001L;\n    json string_1 = \"foo\";\n    json string_2 = \"bar\";\n\n    // output values and comparisons\n    std::cout << std::boolalpha;\n    std::cout << array_1 << \" > \" << array_2 << \" \" << (array_1 > array_2) << '\\n';\n    std::cout << object_1 << \" > \" << object_2 << \" \" << (object_1 > object_2) << '\\n';\n    std::cout << number_1 << \" > \" << number_2 << \" \" << (number_1 > number_2) << '\\n';\n    std::cout << string_1 << \" > \" << string_2 << \" \" << (string_1 > string_2) << '\\n';\n}\n

    Output:

    [1,2,3] > [1,2,4] false\n{\"A\":\"a\",\"B\":\"b\"} > {\"A\":\"a\",\"B\":\"b\"} false\n17 > 17.0000000000001 false\n\"foo\" > \"bar\" true\n
    "},{"location":"api/basic_json/operator_gt/#see-also","title":"See also","text":"
    • operator<=> comparison: 3-way
    "},{"location":"api/basic_json/operator_gt/#version-history","title":"Version history","text":"
    1. Added in version 1.0.0. Conditionally removed since C++20 in version 3.11.0.
    2. Added in version 1.0.0. Conditionally removed since C++20 in version 3.11.0.
    "},{"location":"api/basic_json/operator_le/","title":"nlohmann::basic_json::operator<=","text":"
    // until C++20\nbool operator<=(const_reference lhs, const_reference rhs) noexcept;   // (1)\n\ntemplate<typename ScalarType>\nbool operator<=(const_reference lhs, const ScalarType rhs) noexcept;  // (2)\n\ntemplate<typename ScalarType>\nbool operator<=(ScalarType lhs, const const_reference rhs) noexcept;  // (2)\n

    1. Compares whether one JSON value lhs is less than or equal to another JSON value rhs according to the following rules:

      • The comparison always yields false if (1) either operand is discarded, or (2) either operand is NaN and the other operand is either NaN or any other number.
      • Otherwise, returns the result of !(rhs < lhs) (see operator<).

    2. Compares whether a JSON value is less than or equal to a scalar or a scalar is less than or equal to a JSON value by converting the scalar to a JSON value and comparing both JSON values according to 1.

    "},{"location":"api/basic_json/operator_le/#template-parameters","title":"Template parameters","text":"ScalarType a scalar type according to std::is_scalar<ScalarType>::value"},{"location":"api/basic_json/operator_le/#parameters","title":"Parameters","text":"lhs (in) first value to consider rhs (in) second value to consider"},{"location":"api/basic_json/operator_le/#return-value","title":"Return value","text":"

    whether lhs is less than or equal to rhs

    "},{"location":"api/basic_json/operator_le/#exception-safety","title":"Exception safety","text":"

    No-throw guarantee: this function never throws exceptions.

    "},{"location":"api/basic_json/operator_le/#complexity","title":"Complexity","text":"

    Linear.

    "},{"location":"api/basic_json/operator_le/#notes","title":"Notes","text":"

    Comparing NaN

    NaN values are unordered within the domain of numbers. The following comparisons all yield false: 1. Comparing a NaN with itself. 2. Comparing a NaN with another NaN. 3. Comparing a NaN and any other number.

    Operator overload resolution

    Since C++20 overload resolution will consider the rewritten candidate generated from operator<=>.

    "},{"location":"api/basic_json/operator_le/#examples","title":"Examples","text":"Example

    The example demonstrates comparing several JSON types.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // create several JSON values\n    json array_1 = {1, 2, 3};\n    json array_2 = {1, 2, 4};\n    json object_1 = {{\"A\", \"a\"}, {\"B\", \"b\"}};\n    json object_2 = {{\"B\", \"b\"}, {\"A\", \"a\"}};\n    json number_1 = 17;\n    json number_2 = 17.0000000000001L;\n    json string_1 = \"foo\";\n    json string_2 = \"bar\";\n\n    // output values and comparisons\n    std::cout << std::boolalpha;\n    std::cout << array_1 << \" <= \" << array_2 << \" \" << (array_1 <= array_2) << '\\n';\n    std::cout << object_1 << \" <= \" << object_2 << \" \" << (object_1 <= object_2) << '\\n';\n    std::cout << number_1 << \" <= \" << number_2 << \" \" << (number_1 <= number_2) << '\\n';\n    std::cout << string_1 << \" <= \" << string_2 << \" \" << (string_1 <= string_2) << '\\n';\n}\n

    Output:

    [1,2,3] <= [1,2,4] true\n{\"A\":\"a\",\"B\":\"b\"} <= {\"A\":\"a\",\"B\":\"b\"} true\n17 <= 17.0000000000001 true\n\"foo\" <= \"bar\" false\n
    "},{"location":"api/basic_json/operator_le/#see-also","title":"See also","text":"
    • operator<=> comparison: 3-way
    "},{"location":"api/basic_json/operator_le/#version-history","title":"Version history","text":"
    1. Added in version 1.0.0. Conditionally removed since C++20 in version 3.11.0.
    2. Added in version 1.0.0. Conditionally removed since C++20 in version 3.11.0.
    "},{"location":"api/basic_json/operator_lt/","title":"nlohmann::basic_json::operator<","text":"
    // until C++20\nbool operator<(const_reference lhs, const_reference rhs) noexcept;   // (1)\n\ntemplate<typename ScalarType>\nbool operator<(const_reference lhs, const ScalarType rhs) noexcept;  // (2)\n\ntemplate<typename ScalarType>\nbool operator<(ScalarType lhs, const const_reference rhs) noexcept;  // (2)\n

    1. Compares whether one JSON value lhs is less than another JSON value rhs according to the following rules:

      • If either operand is discarded, the comparison yields false.
      • If both operands have the same type, the values are compared using their respective operator<.
      • Integer and floating-point numbers are automatically converted before comparison.
      • In case lhs and rhs have different types, the values are ignored and the order of the types is considered, which is:
        1. null
        2. boolean
        3. number (all types)
        4. object
        5. array
        6. string
        7. binary For instance, any boolean value is considered less than any string.

    2. Compares whether a JSON value is less than a scalar or a scalar is less than a JSON value by converting the scalar to a JSON value and comparing both JSON values according to 1.

    "},{"location":"api/basic_json/operator_lt/#template-parameters","title":"Template parameters","text":"ScalarType a scalar type according to std::is_scalar<ScalarType>::value"},{"location":"api/basic_json/operator_lt/#parameters","title":"Parameters","text":"lhs (in) first value to consider rhs (in) second value to consider"},{"location":"api/basic_json/operator_lt/#return-value","title":"Return value","text":"

    whether lhs is less than rhs

    "},{"location":"api/basic_json/operator_lt/#exception-safety","title":"Exception safety","text":"

    No-throw guarantee: this function never throws exceptions.

    "},{"location":"api/basic_json/operator_lt/#complexity","title":"Complexity","text":"

    Linear.

    "},{"location":"api/basic_json/operator_lt/#notes","title":"Notes","text":"

    Comparing NaN

    NaN values are unordered within the domain of numbers. The following comparisons all yield false: 1. Comparing a NaN with itself. 2. Comparing a NaN with another NaN. 3. Comparing a NaN and any other number.

    Operator overload resolution

    Since C++20 overload resolution will consider the rewritten candidate generated from operator<=>.

    "},{"location":"api/basic_json/operator_lt/#examples","title":"Examples","text":"Example

    The example demonstrates comparing several JSON types.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // create several JSON values\n    json array_1 = {1, 2, 3};\n    json array_2 = {1, 2, 4};\n    json object_1 = {{\"A\", \"a\"}, {\"B\", \"b\"}};\n    json object_2 = {{\"B\", \"b\"}, {\"A\", \"a\"}};\n    json number_1 = 17;\n    json number_2 = 17.0000000000001L;\n    json string_1 = \"foo\";\n    json string_2 = \"bar\";\n\n    // output values and comparisons\n    std::cout << std::boolalpha;\n    std::cout << array_1 << \" == \" << array_2 << \" \" << (array_1 < array_2) << '\\n';\n    std::cout << object_1 << \" == \" << object_2 << \" \" << (object_1 < object_2) << '\\n';\n    std::cout << number_1 << \" == \" << number_2 << \" \" << (number_1 < number_2) << '\\n';\n    std::cout << string_1 << \" == \" << string_2 << \" \" << (string_1 < string_2) << '\\n';\n}\n

    Output:

    [1,2,3] == [1,2,4] true\n{\"A\":\"a\",\"B\":\"b\"} == {\"A\":\"a\",\"B\":\"b\"} false\n17 == 17.0000000000001 true\n\"foo\" == \"bar\" false\n
    "},{"location":"api/basic_json/operator_lt/#see-also","title":"See also","text":"
    • operator<=> comparison: 3-way
    "},{"location":"api/basic_json/operator_lt/#version-history","title":"Version history","text":"
    1. Added in version 1.0.0. Conditionally removed since C++20 in version 3.11.0.
    2. Added in version 1.0.0. Conditionally removed since C++20 in version 3.11.0.
    "},{"location":"api/basic_json/operator_ne/","title":"nlohmann::basic_json::operator!=","text":"
    // until C++20\nbool operator!=(const_reference lhs, const_reference rhs) noexcept;   // (1)\n\ntemplate<typename ScalarType>\nbool operator!=(const_reference lhs, const ScalarType rhs) noexcept;  // (2)\n\ntemplate<typename ScalarType>\nbool operator!=(ScalarType lhs, const const_reference rhs) noexcept;  // (2)\n\n// since C++20\nclass basic_json {\n    bool operator!=(const_reference rhs) const noexcept;              // (1)\n\n    template<typename ScalarType>\n    bool operator!=(ScalarType rhs) const noexcept;                   // (2)\n};\n

    1. Compares two JSON values for inequality according to the following rules:

      • The comparison always yields false if (1) either operand is discarded, or (2) either operand is NaN and the other operand is either NaN or any other number.
      • Otherwise, returns the result of !(lhs == rhs) (until C++20) or !(*this == rhs) (since C++20).

    2. Compares a JSON value and a scalar or a scalar and a JSON value for inequality by converting the scalar to a JSON value and comparing both JSON values according to 1.

    "},{"location":"api/basic_json/operator_ne/#template-parameters","title":"Template parameters","text":"ScalarType a scalar type according to std::is_scalar<ScalarType>::value"},{"location":"api/basic_json/operator_ne/#parameters","title":"Parameters","text":"lhs (in) first value to consider rhs (in) second value to consider"},{"location":"api/basic_json/operator_ne/#return-value","title":"Return value","text":"

    whether the values lhs/*this and rhs are not equal

    "},{"location":"api/basic_json/operator_ne/#exception-safety","title":"Exception safety","text":"

    No-throw guarantee: this function never throws exceptions.

    "},{"location":"api/basic_json/operator_ne/#complexity","title":"Complexity","text":"

    Linear.

    "},{"location":"api/basic_json/operator_ne/#notes","title":"Notes","text":"

    Comparing NaN

    NaN values are unordered within the domain of numbers. The following comparisons all yield false: 1. Comparing a NaN with itself. 2. Comparing a NaN with another NaN. 3. Comparing a NaN and any other number.

    "},{"location":"api/basic_json/operator_ne/#examples","title":"Examples","text":"Example

    The example demonstrates comparing several JSON types.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // create several JSON values\n    json array_1 = {1, 2, 3};\n    json array_2 = {1, 2, 4};\n    json object_1 = {{\"A\", \"a\"}, {\"B\", \"b\"}};\n    json object_2 = {{\"B\", \"b\"}, {\"A\", \"a\"}};\n    json number_1 = 17;\n    json number_2 = 17.000000000000001L;\n    json string_1 = \"foo\";\n    json string_2 = \"bar\";\n\n    // output values and comparisons\n    std::cout << std::boolalpha;\n    std::cout << array_1 << \" != \" << array_2 << \" \" << (array_1 != array_2) << '\\n';\n    std::cout << object_1 << \" != \" << object_2 << \" \" << (object_1 != object_2) << '\\n';\n    std::cout << number_1 << \" != \" << number_2 << \" \" << (number_1 != number_2) << '\\n';\n    std::cout << string_1 << \" != \" << string_2 << \" \" << (string_1 != string_2) << '\\n';\n}\n

    Output:

    [1,2,3] != [1,2,4] true\n{\"A\":\"a\",\"B\":\"b\"} != {\"A\":\"a\",\"B\":\"b\"} false\n17 != 17.0 false\n\"foo\" != \"bar\" true\n
    Example

    The example demonstrates comparing several JSON types against the null pointer (JSON null).

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // create several JSON values\n    json array = {1, 2, 3};\n    json object = {{\"A\", \"a\"}, {\"B\", \"b\"}};\n    json number = 17;\n    json string = \"foo\";\n    json null;\n\n    // output values and comparisons\n    std::cout << std::boolalpha;\n    std::cout << array << \" != nullptr \" << (array != nullptr) << '\\n';\n    std::cout << object << \" != nullptr \" << (object != nullptr) << '\\n';\n    std::cout << number << \" != nullptr \" << (number != nullptr) << '\\n';\n    std::cout << string << \" != nullptr \" << (string != nullptr) << '\\n';\n    std::cout << null << \" != nullptr \" << (null != nullptr) << '\\n';\n}\n

    Output:

    [1,2,3] != nullptr true\n{\"A\":\"a\",\"B\":\"b\"} != nullptr true\n17 != nullptr true\n\"foo\" != nullptr true\nnull != nullptr false\n
    "},{"location":"api/basic_json/operator_ne/#version-history","title":"Version history","text":"
    1. Added in version 1.0.0. Added C++20 member functions in version 3.11.0.
    2. Added in version 1.0.0. Added C++20 member functions in version 3.11.0.
    "},{"location":"api/basic_json/operator_spaceship/","title":"nlohmann::basic_json::operator<=>","text":"
    // since C++20\nclass basic_json {\n    std::partial_ordering operator<=>(const_reference rhs) const noexcept;  // (1)\n\n    template<typename ScalarType>\n    std::partial_ordering operator<=>(const ScalarType rhs) const noexcept; // (2)\n};\n

    1. 3-way compares two JSON values producing a result of type std::partial_ordering according to the following rules:

      • Two JSON values compare with a result of std::partial_ordering::unordered if either value is discarded.
      • If both JSON values are of the same type, the result is produced by 3-way comparing their stored values using their respective operator<=>.
      • Integer and floating-point numbers are converted to their common type and then 3-way compared using their respective operator<=>. For instance, comparing an integer and a floating-point value will 3-way compare the first value converted to floating-point with the second value.
      • Otherwise, yields a result by comparing the type (see value_t).

    2. 3-way compares a JSON value and a scalar or a scalar and a JSON value by converting the scalar to a JSON value and 3-way comparing both JSON values (see 1).

    "},{"location":"api/basic_json/operator_spaceship/#template-parameters","title":"Template parameters","text":"ScalarType a scalar type according to std::is_scalar<ScalarType>::value"},{"location":"api/basic_json/operator_spaceship/#parameters","title":"Parameters","text":"rhs (in) second value to consider"},{"location":"api/basic_json/operator_spaceship/#return-value","title":"Return value","text":"

    the std::partial_ordering of the 3-way comparison of *this and rhs

    "},{"location":"api/basic_json/operator_spaceship/#exception-safety","title":"Exception safety","text":"

    No-throw guarantee: this function never throws exceptions.

    "},{"location":"api/basic_json/operator_spaceship/#complexity","title":"Complexity","text":"

    Linear.

    "},{"location":"api/basic_json/operator_spaceship/#notes","title":"Notes","text":"

    Comparing NaN

    • NaN values are unordered within the domain of numbers. The following comparisons all yield std::partial_ordering::unordered:
      1. Comparing a NaN with itself.
      2. Comparing a NaN with another NaN.
      3. Comparing a NaN and any other number.
    "},{"location":"api/basic_json/operator_spaceship/#examples","title":"Examples","text":"Example: (1) comparing JSON values

    The example demonstrates comparing several JSON values.

    #include <compare>\n#include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nconst char* to_string(const std::partial_ordering& po)\n{\n    if (std::is_lt(po))\n    {\n        return \"less\";\n    }\n    else if (std::is_gt(po))\n    {\n        return \"greater\";\n    }\n    else if (std::is_eq(po))\n    {\n        return \"equivalent\";\n    }\n    return \"unordered\";\n}\n\nint main()\n{\n    // create several JSON values\n    json array_1 = {1, 2, 3};\n    json array_2 = {1, 2, 4};\n    json object_1 = {{\"A\", \"a\"}, {\"B\", \"b\"}};\n    json object_2 = {{\"B\", \"b\"}, {\"A\", \"a\"}};\n    json number = 17;\n    json string = \"foo\";\n    json discarded = json(json::value_t::discarded);\n\n    // output values and comparisons\n    std::cout << array_1 << \" <=> \" << array_2 << \" := \" << to_string(array_1 <=> array_2) << '\\n'; // *NOPAD*\n    std::cout << object_1 << \" <=> \" << object_2 << \" := \" << to_string(object_1 <=> object_2) << '\\n'; // *NOPAD*\n    std::cout << string << \" <=> \" << number << \" := \" << to_string(string <=> number) << '\\n'; // *NOPAD*\n    std::cout << string << \" <=> \" << discarded << \" := \" << to_string(string <=> discarded) << '\\n'; // *NOPAD*\n}\n

    Output:

    [1,2,3] <=> [1,2,4] := less\n{\"A\":\"a\",\"B\":\"b\"} <=> {\"A\":\"a\",\"B\":\"b\"} := equivalent\n\"foo\" <=> 17 := greater\n\"foo\" <=> <discarded> := unordered\n
    Example: (2) comparing JSON values and scalars

    The example demonstrates comparing several JSON values and scalars.

    #include <compare>\n#include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nconst char* to_string(const std::partial_ordering& po)\n{\n    if (std::is_lt(po))\n    {\n        return \"less\";\n    }\n    else if (std::is_gt(po))\n    {\n        return \"greater\";\n    }\n    else if (std::is_eq(po))\n    {\n        return \"equivalent\";\n    }\n    return \"unordered\";\n}\n\nint main()\n{\n    using float_limits = std::numeric_limits<json::number_float_t>;\n    constexpr auto nan = float_limits::quiet_NaN();\n\n    // create several JSON values\n    json boolean = false;\n    json number = 17;\n    json string = \"17\";\n\n    // output values and comparisons\n    std::cout << std::boolalpha << std::fixed;\n    std::cout << boolean << \" <=> \" << true << \" := \" << to_string(boolean <=> true) << '\\n'; // *NOPAD*\n    std::cout << number << \" <=> \" << 17.0 << \" := \" << to_string(number <=> 17.0) << '\\n'; // *NOPAD*\n    std::cout << number << \" <=> \" << nan << \" := \" << to_string(number <=> nan) << '\\n'; // *NOPAD*\n    std::cout << string << \" <=> \" << 17 << \" := \" << to_string(string <=> 17) << '\\n'; // *NOPAD*\n}\n

    Output:

    false <=> true := less\n17 <=> 17.000000 := equivalent\n17 <=> nan := unordered\n\"17\" <=> 17 := greater\n
    "},{"location":"api/basic_json/operator_spaceship/#see-also","title":"See also","text":"
    • operator== - comparison: equal
    • operator!= - comparison: not equal
    • operator< - comparison: less than
    • operator<= - comparison: less than or equal
    • operator> - comparison: greater than
    • operator>= - comparison: greater than or equal
    "},{"location":"api/basic_json/operator_spaceship/#version-history","title":"Version history","text":"
    1. Added in version 3.11.0.
    2. Added in version 3.11.0.
    "},{"location":"api/basic_json/operator_value_t/","title":"nlohmann::basic_json::operator value_t","text":"
    constexpr operator value_t() const noexcept;\n

    Return the type of the JSON value as a value from the value_t enumeration.

    "},{"location":"api/basic_json/operator_value_t/#return-value","title":"Return value","text":"

    the type of the JSON value

    Value type return value null value_t::null boolean value_t::boolean string value_t::string number (integer) value_t::number_integer number (unsigned integer) value_t::number_unsigned number (floating-point) value_t::number_float object value_t::object array value_t::array binary value_t::binary discarded value_t::discarded"},{"location":"api/basic_json/operator_value_t/#exception-safety","title":"Exception safety","text":"

    No-throw guarantee: this member function never throws exceptions.

    "},{"location":"api/basic_json/operator_value_t/#complexity","title":"Complexity","text":"

    Constant.

    "},{"location":"api/basic_json/operator_value_t/#examples","title":"Examples","text":"Example

    The following code exemplifies operator value_t() for all JSON types.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // create JSON values\n    json j_null;\n    json j_boolean = true;\n    json j_number_integer = -17;\n    json j_number_unsigned = 42u;\n    json j_number_float = 23.42;\n    json j_object = {{\"one\", 1}, {\"two\", 2}};\n    json j_array = {1, 2, 4, 8, 16};\n    json j_string = \"Hello, world\";\n\n    // call operator value_t()\n    json::value_t t_null = j_null;\n    json::value_t t_boolean = j_boolean;\n    json::value_t t_number_integer = j_number_integer;\n    json::value_t t_number_unsigned = j_number_unsigned;\n    json::value_t t_number_float = j_number_float;\n    json::value_t t_object = j_object;\n    json::value_t t_array = j_array;\n    json::value_t t_string = j_string;\n\n    // print types\n    std::cout << std::boolalpha;\n    std::cout << (t_null == json::value_t::null) << '\\n';\n    std::cout << (t_boolean == json::value_t::boolean) << '\\n';\n    std::cout << (t_number_integer == json::value_t::number_integer) << '\\n';\n    std::cout << (t_number_unsigned == json::value_t::number_unsigned) << '\\n';\n    std::cout << (t_number_float == json::value_t::number_float) << '\\n';\n    std::cout << (t_object == json::value_t::object) << '\\n';\n    std::cout << (t_array == json::value_t::array) << '\\n';\n    std::cout << (t_string == json::value_t::string) << '\\n';\n}\n

    Output:

    true\ntrue\ntrue\ntrue\ntrue\ntrue\ntrue\ntrue\n
    "},{"location":"api/basic_json/operator_value_t/#version-history","title":"Version history","text":"
    • Added in version 1.0.0.
    • Added unsigned integer type in version 2.0.0.
    • Added binary type in version 3.8.0.
    "},{"location":"api/basic_json/other_error/","title":"nlohmann::basic_json::other_error","text":"
    class other_error : public exception;\n

    This exception is thrown in case of errors that cannot be classified with the other exception types.

    Exceptions have ids 5xx (see list of other errors).

    classDiagram\n  direction LR\n\n    class std_exception [\"std::exception\"] {\n        <<interface>>\n    }\n\n    class json_exception [\"basic_json::exception\"] {\n        +const int id\n        +const char* what() const\n    }\n\n    class json_parse_error [\"basic_json::parse_error\"] {\n        +const std::size_t byte\n    }\n\n    class json_invalid_iterator [\"basic_json::invalid_iterator\"]\n    class json_type_error [\"basic_json::type_error\"]\n    class json_out_of_range [\"basic_json::out_of_range\"]\n    class json_other_error [\"basic_json::other_error\"]\n\n    std_exception <|-- json_exception\n    json_exception <|-- json_parse_error\n    json_exception <|-- json_invalid_iterator\n    json_exception <|-- json_type_error\n    json_exception <|-- json_out_of_range\n    json_exception <|-- json_other_error\n\n    style json_other_error fill:#CCCCFF
    "},{"location":"api/basic_json/other_error/#member-functions","title":"Member functions","text":"
    • what - returns explanatory string
    "},{"location":"api/basic_json/other_error/#member-variables","title":"Member variables","text":"
    • id - the id of the exception
    "},{"location":"api/basic_json/other_error/#examples","title":"Examples","text":"Example

    The following code shows how a other_error exception can be caught.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\nusing namespace nlohmann::literals;\n\nint main()\n{\n    try\n    {\n        // executing a failing JSON Patch operation\n        json value = R\"({\n            \"best_biscuit\": {\n                \"name\": \"Oreo\"\n            }\n        })\"_json;\n        json patch = R\"([{\n            \"op\": \"test\",\n            \"path\": \"/best_biscuit/name\",\n            \"value\": \"Choco Leibniz\"\n        }])\"_json;\n        value.patch(patch);\n    }\n    catch (const json::other_error& e)\n    {\n        // output exception information\n        std::cout << \"message: \" << e.what() << '\\n'\n                  << \"exception id: \" << e.id << std::endl;\n    }\n}\n

    Output:

    message: [json.exception.other_error.501] unsuccessful: {\"op\":\"test\",\"path\":\"/best_biscuit/name\",\"value\":\"Choco Leibniz\"}\nexception id: 501\n
    "},{"location":"api/basic_json/other_error/#see-also","title":"See also","text":"
    • List of other errors
    • parse_error for exceptions indicating a parse error
    • invalid_iterator for exceptions indicating errors with iterators
    • type_error for exceptions indicating executing a member function with a wrong type
    • out_of_range for exceptions indicating access out of the defined range
    "},{"location":"api/basic_json/other_error/#version-history","title":"Version history","text":"
    • Since version 3.0.0.
    "},{"location":"api/basic_json/out_of_range/","title":"nlohmann::basic_json::out_of_range","text":"
    class out_of_range : public exception;\n

    This exception is thrown in case a library function is called on an input parameter that exceeds the expected range, for instance, in the case of array indices or nonexisting object keys.

    Exceptions have ids 4xx (see list of out-of-range errors).

    classDiagram\n  direction LR\n\n    class std_exception [\"std::exception\"] {\n        <<interface>>\n    }\n\n    class json_exception [\"basic_json::exception\"] {\n        +const int id\n        +const char* what() const\n    }\n\n    class json_parse_error [\"basic_json::parse_error\"] {\n        +const std::size_t byte\n    }\n\n    class json_invalid_iterator [\"basic_json::invalid_iterator\"]\n    class json_type_error [\"basic_json::type_error\"]\n    class json_out_of_range [\"basic_json::out_of_range\"]\n    class json_other_error [\"basic_json::other_error\"]\n\n    std_exception <|-- json_exception\n    json_exception <|-- json_parse_error\n    json_exception <|-- json_invalid_iterator\n    json_exception <|-- json_type_error\n    json_exception <|-- json_out_of_range\n    json_exception <|-- json_other_error\n\n    style json_out_of_range fill:#CCCCFF
    "},{"location":"api/basic_json/out_of_range/#member-functions","title":"Member functions","text":"
    • what - returns explanatory string
    "},{"location":"api/basic_json/out_of_range/#member-variables","title":"Member variables","text":"
    • id - the id of the exception
    "},{"location":"api/basic_json/out_of_range/#examples","title":"Examples","text":"Example

    The following code shows how a out_of_range exception can be caught.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    try\n    {\n        // calling at() for an invalid index\n        json j = {1, 2, 3, 4};\n        j.at(4) = 10;\n    }\n    catch (const json::out_of_range& e)\n    {\n        // output exception information\n        std::cout << \"message: \" << e.what() << '\\n'\n                  << \"exception id: \" << e.id << std::endl;\n    }\n}\n

    Output:

    message: [json.exception.out_of_range.401] array index 4 is out of range\nexception id: 401\n
    "},{"location":"api/basic_json/out_of_range/#see-also","title":"See also","text":"
    • List of out-of-range errors
    • parse_error for exceptions indicating a parse error
    • invalid_iterator for exceptions indicating errors with iterators
    • type_error for exceptions indicating executing a member function with a wrong type
    • other_error for exceptions indicating other library errors
    "},{"location":"api/basic_json/out_of_range/#version-history","title":"Version history","text":"
    • Since version 3.0.0.
    "},{"location":"api/basic_json/parse/","title":"nlohmann::basic_json::parse","text":"
    // (1)\ntemplate<typename InputType>\nstatic basic_json parse(InputType&& i,\n                        const parser_callback_t cb = nullptr,\n                        const bool allow_exceptions = true,\n                        const bool ignore_comments = false,\n                        const bool ignore_trailing_commas = false);\n\n// (2)\ntemplate<typename IteratorType>\nstatic basic_json parse(IteratorType first, IteratorType last,\n                        const parser_callback_t cb = nullptr,\n                        const bool allow_exceptions = true,\n                        const bool ignore_comments = false,\n                        const bool ignore_trailing_commas = false);\n
    1. Deserialize from a compatible input.

    2. Deserialize from a pair of character iterators

      The value_type of the iterator must be an integral type with size of 1, 2, or 4 bytes, which will be interpreted respectively as UTF-8, UTF-16, and UTF-32.

    "},{"location":"api/basic_json/parse/#template-parameters","title":"Template parameters","text":"InputType

    A compatible input, for instance:

    • an std::istream object
    • a FILE pointer (throws if null)
    • a C-style array of characters
    • a pointer to a null-terminated string of single byte characters (throws if null)
    • a std::string
    • an object obj for which begin(obj) and end(obj) produces a valid pair of iterators.
    IteratorType

    a compatible iterator type, for instance.

    • a pair of std::string::iterator or std::vector<std::uint8_t>::iterator
    • a pair of pointers such as ptr and ptr + len
    "},{"location":"api/basic_json/parse/#parameters","title":"Parameters","text":"i (in) Input to parse from. cb (in) a parser callback function of type parser_callback_t which is used to control the deserialization by filtering unwanted values (optional) allow_exceptions (in) whether to throw exceptions in case of a parse error (optional, true by default) ignore_comments (in) whether comments should be ignored and treated like whitespace (true) or yield a parse error (false); (optional, false by default) ignore_trailing_commas (in) whether trailing commas in arrays or objects should be ignored and treated like whitespace (true) or yield a parse error (false); (optional, false by default) first (in) iterator to the start of a character range last (in) iterator to the end of a character range"},{"location":"api/basic_json/parse/#return-value","title":"Return value","text":"

    Deserialized JSON value; in case of a parse error and allow_exceptions set to false, the return value will be value_t::discarded. The latter can be checked with is_discarded.

    "},{"location":"api/basic_json/parse/#exception-safety","title":"Exception safety","text":"

    Strong guarantee: if an exception is thrown, there are no changes in the JSON value.

    "},{"location":"api/basic_json/parse/#exceptions","title":"Exceptions","text":"
    • Throws parse_error.101 in case of an unexpected token, or empty input like a null FILE* or char* pointer.
    • Throws parse_error.102 if to_unicode fails or surrogate error.
    • Throws parse_error.103 if to_unicode fails.
    "},{"location":"api/basic_json/parse/#complexity","title":"Complexity","text":"

    Linear in the length of the input. The parser is a predictive LL(1) parser. The complexity can be higher if the parser callback function cb or reading from (1) the input i or (2) the iterator range [first, last] has a super-linear complexity.

    "},{"location":"api/basic_json/parse/#notes","title":"Notes","text":"

    A UTF-8 byte order mark is silently ignored.

    "},{"location":"api/basic_json/parse/#examples","title":"Examples","text":"Parsing from a character array

    The example below demonstrates the parse() function reading from an array.

    #include <iostream>\n#include <iomanip>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // a JSON text\n    char text[] = R\"(\n    {\n        \"Image\": {\n            \"Width\":  800,\n            \"Height\": 600,\n            \"Title\":  \"View from 15th Floor\",\n            \"Thumbnail\": {\n                \"Url\":    \"http://www.example.com/image/481989943\",\n                \"Height\": 125,\n                \"Width\":  100\n            },\n            \"Animated\" : false,\n            \"IDs\": [116, 943, 234, 38793]\n        }\n    }\n    )\";\n\n    // parse and serialize JSON\n    json j_complete = json::parse(text);\n    std::cout << std::setw(4) << j_complete << \"\\n\\n\";\n}\n

    Output:

    {\n    \"Image\": {\n        \"Animated\": false,\n        \"Height\": 600,\n        \"IDs\": [\n            116,\n            943,\n            234,\n            38793\n        ],\n        \"Thumbnail\": {\n            \"Height\": 125,\n            \"Url\": \"http://www.example.com/image/481989943\",\n            \"Width\": 100\n        },\n        \"Title\": \"View from 15th Floor\",\n        \"Width\": 800\n    }\n}\n
    Parsing from a string

    The example below demonstrates the parse() function with and without callback function.

    #include <iostream>\n#include <iomanip>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // a JSON text\n    auto text = R\"(\n    {\n        \"Image\": {\n            \"Width\":  800,\n            \"Height\": 600,\n            \"Title\":  \"View from 15th Floor\",\n            \"Thumbnail\": {\n                \"Url\":    \"http://www.example.com/image/481989943\",\n                \"Height\": 125,\n                \"Width\":  100\n            },\n            \"Animated\" : false,\n            \"IDs\": [116, 943, 234, 38793]\n        }\n    }\n    )\";\n\n    // parse and serialize JSON\n    json j_complete = json::parse(text);\n    std::cout << std::setw(4) << j_complete << \"\\n\\n\";\n\n    // define parser callback\n    json::parser_callback_t cb = [](int depth, json::parse_event_t event, json & parsed)\n    {\n        // skip object elements with key \"Thumbnail\"\n        if (event == json::parse_event_t::key and parsed == json(\"Thumbnail\"))\n        {\n            return false;\n        }\n        else\n        {\n            return true;\n        }\n    };\n\n    // parse (with callback) and serialize JSON\n    json j_filtered = json::parse(text, cb);\n    std::cout << std::setw(4) << j_filtered << '\\n';\n}\n

    Output:

    {\n    \"Image\": {\n        \"Animated\": false,\n        \"Height\": 600,\n        \"IDs\": [\n            116,\n            943,\n            234,\n            38793\n        ],\n        \"Thumbnail\": {\n            \"Height\": 125,\n            \"Url\": \"http://www.example.com/image/481989943\",\n            \"Width\": 100\n        },\n        \"Title\": \"View from 15th Floor\",\n        \"Width\": 800\n    }\n}\n\n{\n    \"Image\": {\n        \"Animated\": false,\n        \"Height\": 600,\n        \"IDs\": [\n            116,\n            943,\n            234,\n            38793\n        ],\n        \"Title\": \"View from 15th Floor\",\n        \"Width\": 800\n    }\n}\n
    Parsing from an input stream

    The example below demonstrates the parse() function with and without callback function.

    #include <iostream>\n#include <iomanip>\n#include <sstream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // a JSON text\n    auto text = R\"(\n    {\n        \"Image\": {\n            \"Width\":  800,\n            \"Height\": 600,\n            \"Title\":  \"View from 15th Floor\",\n            \"Thumbnail\": {\n                \"Url\":    \"http://www.example.com/image/481989943\",\n                \"Height\": 125,\n                \"Width\":  100\n            },\n            \"Animated\" : false,\n            \"IDs\": [116, 943, 234, 38793]\n        }\n    }\n    )\";\n\n    // fill a stream with JSON text\n    std::stringstream ss;\n    ss << text;\n\n    // parse and serialize JSON\n    json j_complete = json::parse(ss);\n    std::cout << std::setw(4) << j_complete << \"\\n\\n\";\n\n    // define parser callback\n    json::parser_callback_t cb = [](int depth, json::parse_event_t event, json & parsed)\n    {\n        // skip object elements with key \"Thumbnail\"\n        if (event == json::parse_event_t::key and parsed == json(\"Thumbnail\"))\n        {\n            return false;\n        }\n        else\n        {\n            return true;\n        }\n    };\n\n    // fill a stream with JSON text\n    ss.clear();\n    ss << text;\n\n    // parse (with callback) and serialize JSON\n    json j_filtered = json::parse(ss, cb);\n    std::cout << std::setw(4) << j_filtered << '\\n';\n}\n

    Output:

    {\n    \"Image\": {\n        \"Animated\": false,\n        \"Height\": 600,\n        \"IDs\": [\n            116,\n            943,\n            234,\n            38793\n        ],\n        \"Thumbnail\": {\n            \"Height\": 125,\n            \"Url\": \"http://www.example.com/image/481989943\",\n            \"Width\": 100\n        },\n        \"Title\": \"View from 15th Floor\",\n        \"Width\": 800\n    }\n}\n\n{\n    \"Image\": {\n        \"Animated\": false,\n        \"Height\": 600,\n        \"IDs\": [\n            116,\n            943,\n            234,\n            38793\n        ],\n        \"Title\": \"View from 15th Floor\",\n        \"Width\": 800\n    }\n}\n
    Parsing from a contiguous container

    The example below demonstrates the parse() function reading from a contiguous container.

    #include <iostream>\n#include <iomanip>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // a JSON text given as std::vector\n    std::vector<std::uint8_t> text = {'[', '1', ',', '2', ',', '3', ']', '\\0'};\n\n    // parse and serialize JSON\n    json j_complete = json::parse(text);\n    std::cout << std::setw(4) << j_complete << \"\\n\\n\";\n}\n

    Output:

    [\n    1,\n    2,\n    3\n]\n
    Parsing from a non-null-terminated string

    The example below demonstrates the parse() function reading from a string that is not null-terminated.

    #include <iostream>\n#include <iomanip>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // a JSON text given as string that is not null-terminated\n    const char* ptr = \"[1,2,3]another value\";\n\n    // parse and serialize JSON\n    json j_complete = json::parse(ptr, ptr + 7);\n    std::cout << std::setw(4) << j_complete << \"\\n\\n\";\n}\n

    Output:

    [\n    1,\n    2,\n    3\n]\n
    Parsing from an iterator pair

    The example below demonstrates the parse() function reading from an iterator pair.

    #include <iostream>\n#include <iomanip>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // a JSON text given an input with other values\n    std::vector<std::uint8_t> input = {'[', '1', ',', '2', ',', '3', ']', 'o', 't', 'h', 'e', 'r'};\n\n    // parse and serialize JSON\n    json j_complete = json::parse(input.begin(), input.begin() + 7);\n    std::cout << std::setw(4) << j_complete << \"\\n\\n\";\n}\n

    Output:

    [\n    1,\n    2,\n    3\n]\n
    Effect of allow_exceptions parameter

    The example below demonstrates the effect of the allow_exceptions parameter in the \u00b4parse()` function.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // an invalid JSON text\n    std::string text = R\"(\n    {\n        \"key\": \"value without closing quotes\n    }\n    )\";\n\n    // parse with exceptions\n    try\n    {\n        json j = json::parse(text);\n    }\n    catch (const json::parse_error& e)\n    {\n        std::cout << e.what() << std::endl;\n    }\n\n    // parse without exceptions\n    json j = json::parse(text, nullptr, false);\n\n    if (j.is_discarded())\n    {\n        std::cout << \"the input is invalid JSON\" << std::endl;\n    }\n    else\n    {\n        std::cout << \"the input is valid JSON: \" << j << std::endl;\n    }\n}\n

    Output:

    [json.exception.parse_error.101] parse error at line 4, column 0: syntax error while parsing value - invalid string: control character U+000A (LF) must be escaped to \\u000A or \\n; last read: '\"value without closing quotes<U+000A>'\nthe input is invalid JSON\n
    Effect of ignore_comments parameter

    The example below demonstrates the effect of the ignore_comments parameter in the parse() function.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    std::string s = R\"(\n    {\n        // update in 2006: removed Pluto\n        \"planets\": [\"Mercury\", \"Venus\", \"Earth\", \"Mars\",\n                    \"Jupiter\", \"Uranus\", \"Neptune\" /*, \"Pluto\" */]\n    }\n    )\";\n\n    try\n    {\n        json j = json::parse(s);\n    }\n    catch (json::exception& e)\n    {\n        std::cout << e.what() << std::endl;\n    }\n\n    json j = json::parse(s,\n                         /* callback */ nullptr,\n                         /* allow exceptions */ true,\n                         /* ignore_comments */ true);\n    std::cout << j.dump(2) << '\\n';\n}\n

    Output:

    [json.exception.parse_error.101] parse error at line 3, column 9: syntax error while parsing object key - invalid literal; last read: '<U+000A>    {<U+000A>        /'; expected string literal\n{\n  \"planets\": [\n    \"Mercury\",\n    \"Venus\",\n    \"Earth\",\n    \"Mars\",\n    \"Jupiter\",\n    \"Uranus\",\n    \"Neptune\"\n  ]\n}\n
    Effect of ignore_trailing_commas parameter

    The example below demonstrates the effect of the ignore_trailing_commas parameter in the parse() function.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    std::string s = R\"(\n    {\n        \"planets\": [\n            \"Mercury\",\n            \"Venus\",\n            \"Earth\",\n            \"Mars\",\n            \"Jupiter\",\n            \"Uranus\",\n            \"Neptune\",\n        ]\n    }\n    )\";\n\n    try\n    {\n        json j = json::parse(s);\n    }\n    catch (json::exception& e)\n    {\n        std::cout << e.what() << std::endl;\n    }\n\n    json j = json::parse(s,\n                         /* callback */ nullptr,\n                         /* allow exceptions */ true,\n                         /* ignore_comments */ false,\n                         /* ignore_trailing_commas */ true);\n    std::cout << j.dump(2) << '\\n';\n}\n

    Output:

    [json.exception.parse_error.101] parse error at line 11, column 9: syntax error while parsing value - unexpected ']'; expected '[', '{', or a literal\n{\n  \"planets\": [\n    \"Mercury\",\n    \"Venus\",\n    \"Earth\",\n    \"Mars\",\n    \"Jupiter\",\n    \"Uranus\",\n    \"Neptune\"\n  ]\n}\n
    "},{"location":"api/basic_json/parse/#see-also","title":"See also","text":"
    • accept - check if the input is valid JSON
    • operator>> - deserialize from stream
    "},{"location":"api/basic_json/parse/#version-history","title":"Version history","text":"
    • Added in version 1.0.0.
    • Overload for contiguous containers (1) added in version 2.0.3.
    • Ignoring comments via ignore_comments added in version 3.9.0.
    • Changed runtime assertion in case of FILE* null pointers to exception in version 3.12.0.
    • Added ignore_trailing_commas in version 3.12.1.

    Deprecation

    Overload (2) replaces calls to parse with a pair of iterators as their first parameter which has been deprecated in version 3.8.0. This overload will be removed in version 4.0.0. Please replace all calls like parse({ptr, ptr+len}, ...); with parse(ptr, ptr+len, ...);.

    You should be warned by your compiler with a -Wdeprecated-declarations warning if you are using a deprecated function.

    "},{"location":"api/basic_json/parse_error/","title":"nlohmann::basic_json::parse_error","text":"
    class parse_error : public exception;\n

    The library throws this exception when a parse error occurs. Parse errors can occur during the deserialization of JSON text, BSON, CBOR, MessagePack, UBJSON, as well as when using JSON Patch.

    Member byte holds the byte index of the last read character in the input file (see note below).

    Exceptions have ids 1xx (see list of parse errors).

    classDiagram\n  direction LR\n\n    class std_exception [\"std::exception\"] {\n        <<interface>>\n    }\n\n    class json_exception [\"basic_json::exception\"] {\n        +const int id\n        +const char* what() const\n    }\n\n    class json_parse_error [\"basic_json::parse_error\"] {\n        +const std::size_t byte\n    }\n\n    class json_invalid_iterator [\"basic_json::invalid_iterator\"]\n    class json_type_error [\"basic_json::type_error\"]\n    class json_out_of_range [\"basic_json::out_of_range\"]\n    class json_other_error [\"basic_json::other_error\"]\n\n    std_exception <|-- json_exception\n    json_exception <|-- json_parse_error\n    json_exception <|-- json_invalid_iterator\n    json_exception <|-- json_type_error\n    json_exception <|-- json_out_of_range\n    json_exception <|-- json_other_error\n\n    style json_parse_error fill:#CCCCFF
    "},{"location":"api/basic_json/parse_error/#member-functions","title":"Member functions","text":"
    • what - returns explanatory string
    "},{"location":"api/basic_json/parse_error/#member-variables","title":"Member variables","text":"
    • id - the id of the exception
    • byte - byte index of the parse error
    "},{"location":"api/basic_json/parse_error/#notes","title":"Notes","text":"

    For an input with n bytes, 1 is the index of the first character and n+1 is the index of the terminating null byte or the end of file. This also holds true when reading a byte vector for binary formats.

    "},{"location":"api/basic_json/parse_error/#examples","title":"Examples","text":"Example

    The following code shows how a parse_error exception can be caught.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    try\n    {\n        // parsing input with a syntax error\n        json::parse(\"[1,2,3,]\");\n    }\n    catch (const json::parse_error& e)\n    {\n        // output exception information\n        std::cout << \"message: \" << e.what() << '\\n'\n                  << \"exception id: \" << e.id << '\\n'\n                  << \"byte position of error: \" << e.byte << std::endl;\n    }\n}\n

    Output:

    message: [json.exception.parse_error.101] parse error at line 1, column 8: syntax error while parsing value - unexpected ']'; expected '[', '{', or a literal\nexception id: 101\nbyte position of error: 8\n
    "},{"location":"api/basic_json/parse_error/#see-also","title":"See also","text":"
    • List of parse errors
    • invalid_iterator for exceptions indicating errors with iterators
    • type_error for exceptions indicating executing a member function with a wrong type
    • out_of_range for exceptions indicating access out of the defined range
    • other_error for exceptions indicating other library errors
    "},{"location":"api/basic_json/parse_error/#version-history","title":"Version history","text":"
    • Since version 3.0.0.
    "},{"location":"api/basic_json/parse_event_t/","title":"nlohmann::basic_json::parse_event_t","text":"
    enum class parse_event_t : std::uint8_t {\n    object_start,\n    object_end,\n    array_start,\n    array_end,\n    key,\n    value\n};\n

    The parser callback distinguishes the following events:

    • object_start: the parser read { and started to process a JSON object
    • key: the parser read a key of a value in an object
    • object_end: the parser read } and finished processing a JSON object
    • array_start: the parser read [ and started to process a JSON array
    • array_end: the parser read ] and finished processing a JSON array
    • value: the parser finished reading a JSON value
    "},{"location":"api/basic_json/parse_event_t/#examples","title":"Examples","text":""},{"location":"api/basic_json/parse_event_t/#version-history","title":"Version history","text":"
    • Added in version 1.0.0.
    "},{"location":"api/basic_json/parser_callback_t/","title":"nlohmann::basic_json::parser_callback_t","text":"
    template<typename BasicJsonType>\nusing parser_callback_t =\n    std::function<bool(int depth, parse_event_t event, BasicJsonType& parsed)>;\n

    With a parser callback function, the result of parsing a JSON text can be influenced. When passed to parse, it is called on certain events (passed as parse_event_t via parameter event) with a set recursion depth depth and context JSON value parsed. The return value of the callback function is a boolean indicating whether the element that emitted the callback shall be kept or not.

    We distinguish six scenarios (determined by the event type) in which the callback function can be called. The following table describes the values of the parameters depth, event, and parsed.

    parameter event description parameter depth parameter parsed parse_event_t::object_start the parser read { and started to process a JSON object depth of the parent of the JSON object a JSON value with type discarded parse_event_t::key the parser read a key of a value in an object depth of the currently parsed JSON object a JSON string containing the key parse_event_t::object_end the parser read } and finished processing a JSON object depth of the parent of the JSON object the parsed JSON object parse_event_t::array_start the parser read [ and started to process a JSON array depth of the parent of the JSON array a JSON value with type discarded parse_event_t::array_end the parser read ] and finished processing a JSON array depth of the parent of the JSON array the parsed JSON array parse_event_t::value the parser finished reading a JSON value depth of the value the parsed JSON value

    Discarding a value (i.e., returning false) has different effects depending on the context in which function was called:

    • Discarded values in structured types are skipped. That is, the parser will behave as if the discarded value was never read.
    • In case a value outside a structured type is skipped, it is replaced with null. This case happens if the top-level element is skipped.
    "},{"location":"api/basic_json/parser_callback_t/#parameters","title":"Parameters","text":"depth (in) the depth of the recursion during parsing event (in) an event of type parse_event_t indicating the context in the callback function has been called parsed (in, out) the current intermediate parse result; note that writing to this value has no effect for parse_event_t::key events"},{"location":"api/basic_json/parser_callback_t/#return-value","title":"Return value","text":"

    Whether the JSON value which called the function during parsing should be kept (true) or not (false). In the latter case, it is either skipped completely or replaced by an empty discarded object.

    "},{"location":"api/basic_json/parser_callback_t/#examples","title":"Examples","text":"Example

    The example below demonstrates the parse() function with and without callback function.

    #include <iostream>\n#include <iomanip>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // a JSON text\n    auto text = R\"(\n    {\n        \"Image\": {\n            \"Width\":  800,\n            \"Height\": 600,\n            \"Title\":  \"View from 15th Floor\",\n            \"Thumbnail\": {\n                \"Url\":    \"http://www.example.com/image/481989943\",\n                \"Height\": 125,\n                \"Width\":  100\n            },\n            \"Animated\" : false,\n            \"IDs\": [116, 943, 234, 38793]\n        }\n    }\n    )\";\n\n    // parse and serialize JSON\n    json j_complete = json::parse(text);\n    std::cout << std::setw(4) << j_complete << \"\\n\\n\";\n\n    // define parser callback\n    json::parser_callback_t cb = [](int depth, json::parse_event_t event, json & parsed)\n    {\n        // skip object elements with key \"Thumbnail\"\n        if (event == json::parse_event_t::key and parsed == json(\"Thumbnail\"))\n        {\n            return false;\n        }\n        else\n        {\n            return true;\n        }\n    };\n\n    // parse (with callback) and serialize JSON\n    json j_filtered = json::parse(text, cb);\n    std::cout << std::setw(4) << j_filtered << '\\n';\n}\n

    Output:

    {\n    \"Image\": {\n        \"Animated\": false,\n        \"Height\": 600,\n        \"IDs\": [\n            116,\n            943,\n            234,\n            38793\n        ],\n        \"Thumbnail\": {\n            \"Height\": 125,\n            \"Url\": \"http://www.example.com/image/481989943\",\n            \"Width\": 100\n        },\n        \"Title\": \"View from 15th Floor\",\n        \"Width\": 800\n    }\n}\n\n{\n    \"Image\": {\n        \"Animated\": false,\n        \"Height\": 600,\n        \"IDs\": [\n            116,\n            943,\n            234,\n            38793\n        ],\n        \"Title\": \"View from 15th Floor\",\n        \"Width\": 800\n    }\n}\n
    "},{"location":"api/basic_json/parser_callback_t/#version-history","title":"Version history","text":"
    • Added in version 1.0.0.
    "},{"location":"api/basic_json/patch/","title":"nlohmann::basic_json::patch","text":"
    basic_json patch(const basic_json& json_patch) const;\n

    JSON Patch defines a JSON document structure for expressing a sequence of operations to apply to a JSON document. With this function, a JSON Patch is applied to the current JSON value by executing all operations from the patch.

    "},{"location":"api/basic_json/patch/#parameters","title":"Parameters","text":"json_patch (in) JSON patch document"},{"location":"api/basic_json/patch/#return-value","title":"Return value","text":"

    patched document

    "},{"location":"api/basic_json/patch/#exception-safety","title":"Exception safety","text":"

    Strong guarantee: if an exception is thrown, there are no changes in the JSON value.

    "},{"location":"api/basic_json/patch/#exceptions","title":"Exceptions","text":"
    • Throws parse_error.104 if the JSON patch does not consist of an array of objects.
    • Throws parse_error.105 if the JSON patch is malformed (e.g., mandatory attributes are missing); example: \"operation add must have member path\".
    • Throws out_of_range.401 if an array index is out of range.
    • Throws out_of_range.403 if a JSON pointer inside the patch could not be resolved successfully in the current JSON value; example: \"key baz not found\".
    • Throws out_of_range.405 if JSON pointer has no parent (\"add\", \"remove\", \"move\")
    • Throws out_of_range.501 if \"test\" operation was unsuccessful.
    "},{"location":"api/basic_json/patch/#complexity","title":"Complexity","text":"

    Linear in the size of the JSON value and the length of the JSON patch. As usually the patch affects only a fraction of the JSON value, the complexity can usually be neglected.

    "},{"location":"api/basic_json/patch/#notes","title":"Notes","text":"

    The application of a patch is atomic: Either all operations succeed and the patched document is returned or an exception is thrown. In any case, the original value is not changed: the patch is applied to a copy of the value.

    "},{"location":"api/basic_json/patch/#examples","title":"Examples","text":"Example

    The following code shows how a JSON patch is applied to a value.

    #include <iostream>\n#include <iomanip>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\nusing namespace nlohmann::literals;\n\nint main()\n{\n    // the original document\n    json doc = R\"(\n        {\n          \"baz\": \"qux\",\n          \"foo\": \"bar\"\n        }\n    )\"_json;\n\n    // the patch\n    json patch = R\"(\n        [\n          { \"op\": \"replace\", \"path\": \"/baz\", \"value\": \"boo\" },\n          { \"op\": \"add\", \"path\": \"/hello\", \"value\": [\"world\"] },\n          { \"op\": \"remove\", \"path\": \"/foo\"}\n        ]\n    )\"_json;\n\n    // apply the patch\n    json patched_doc = doc.patch(patch);\n\n    // output original and patched document\n    std::cout << std::setw(4) << doc << \"\\n\\n\"\n              << std::setw(4) << patched_doc << std::endl;\n}\n

    Output:

    {\n    \"baz\": \"qux\",\n    \"foo\": \"bar\"\n}\n\n{\n    \"baz\": \"boo\",\n    \"hello\": [\n        \"world\"\n    ]\n}\n
    "},{"location":"api/basic_json/patch/#see-also","title":"See also","text":"
    • RFC 6902 (JSON Patch)
    • RFC 6901 (JSON Pointer)
    • patch_inplace applies a JSON Patch without creating a copy of the document
    • merge_patch applies a JSON Merge Patch
    "},{"location":"api/basic_json/patch/#version-history","title":"Version history","text":"
    • Added in version 2.0.0.
    "},{"location":"api/basic_json/patch_inplace/","title":"nlohmann::basic_json::patch_inplace","text":"
    void patch_inplace(const basic_json& json_patch) const;\n

    JSON Patch defines a JSON document structure for expressing a sequence of operations to apply to a JSON document. With this function, a JSON Patch is applied to the current JSON value by executing all operations from the patch. This function applies a JSON patch in place and returns void.

    "},{"location":"api/basic_json/patch_inplace/#parameters","title":"Parameters","text":"json_patch (in) JSON patch document"},{"location":"api/basic_json/patch_inplace/#exception-safety","title":"Exception safety","text":"

    No guarantees, value may be corrupted by an unsuccessful patch operation.

    "},{"location":"api/basic_json/patch_inplace/#exceptions","title":"Exceptions","text":"
    • Throws parse_error.104 if the JSON patch does not consist of an array of objects.
    • Throws parse_error.105 if the JSON patch is malformed (e.g., mandatory attributes are missing); example: \"operation add must have member path\".
    • Throws out_of_range.401 if an array index is out of range.
    • Throws out_of_range.403 if a JSON pointer inside the patch could not be resolved successfully in the current JSON value; example: \"key baz not found\".
    • Throws out_of_range.405 if JSON pointer has no parent (\"add\", \"remove\", \"move\")
    • Throws out_of_range.501 if \"test\" operation was unsuccessful.
    "},{"location":"api/basic_json/patch_inplace/#complexity","title":"Complexity","text":"

    Linear in the size of the JSON value and the length of the JSON patch. As usually the patch affects only a fraction of the JSON value, the complexity can usually be neglected.

    "},{"location":"api/basic_json/patch_inplace/#notes","title":"Notes","text":"

    Unlike patch, patch_inplace applies the operation \"in place\" and no copy of the JSON value is created. That makes it faster for large documents by avoiding the copy. However, the JSON value might be corrupted if the function throws an exception.

    "},{"location":"api/basic_json/patch_inplace/#examples","title":"Examples","text":"Example

    The following code shows how a JSON patch is applied to a value.

    #include <iostream>\n#include <iomanip>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\nusing namespace nlohmann::literals;\n\nint main()\n{\n    // the original document\n    json doc = R\"(\n        {\n          \"baz\": \"qux\",\n          \"foo\": \"bar\"\n        }\n    )\"_json;\n\n    // the patch\n    json patch = R\"(\n        [\n          { \"op\": \"replace\", \"path\": \"/baz\", \"value\": \"boo\" },\n          { \"op\": \"add\", \"path\": \"/hello\", \"value\": [\"world\"] },\n          { \"op\": \"remove\", \"path\": \"/foo\"}\n        ]\n    )\"_json;\n\n    // output original document\n    std::cout << \"Before\\n\" << std::setw(4) << doc << std::endl;\n\n    // apply the patch\n    doc.patch_inplace(patch);\n\n    // output patched document\n    std::cout << \"\\nAfter\\n\" << std::setw(4) << doc << std::endl;\n}\n

    Output:

    Before\n{\n    \"baz\": \"qux\",\n    \"foo\": \"bar\"\n}\n\nAfter\n{\n    \"baz\": \"boo\",\n    \"hello\": [\n        \"world\"\n    ]\n}\n
    "},{"location":"api/basic_json/patch_inplace/#see-also","title":"See also","text":"
    • RFC 6902 (JSON Patch)
    • RFC 6901 (JSON Pointer)
    • patch applies a JSON Merge Patch
    • merge_patch applies a JSON Merge Patch
    "},{"location":"api/basic_json/patch_inplace/#version-history","title":"Version history","text":"
    • Added in version 3.11.0.
    "},{"location":"api/basic_json/push_back/","title":"nlohmann::basic_json::push_back","text":"
    // (1)\nvoid push_back(basic_json&& val);\nvoid push_back(const basic_json& val);\n\n// (2)\nvoid push_back(const typename object_t::value_type& val);\n\n// (3)\nvoid push_back(initializer_list_t init);\n

    1. Appends the given element val to the end of the JSON array. If the function is called on a JSON null value, an empty array is created before appending val.

    2. Inserts the given element val to the JSON object. If the function is called on a JSON null value, an empty object is created before inserting val.

    3. This function allows using push_back with an initializer list. In case

      1. the current value is an object,
      2. the initializer list init contains only two elements, and
      3. the first element of init is a string,

      init is converted into an object element and added using push_back(const typename object_t::value_type&). Otherwise, init is converted to a JSON value and added using push_back(basic_json&&).

    "},{"location":"api/basic_json/push_back/#iterator-invalidation","title":"Iterator invalidation","text":"

    For all cases where an element is added to an array, a reallocation can happen, in which case all iterators (including the end() iterator) and all references to the elements are invalidated. Otherwise, only the end() iterator is invalidated.

    For ordered_json, also adding an element to an object can yield a reallocation which again invalidates all iterators and all references.

    "},{"location":"api/basic_json/push_back/#parameters","title":"Parameters","text":"val (in) the value to add to the JSON array/object init (in) an initializer list"},{"location":"api/basic_json/push_back/#exceptions","title":"Exceptions","text":"

    All functions can throw the following exception: - Throws type_error.308 when called on a type other than JSON array or null; example: \"cannot use push_back() with number\"

    "},{"location":"api/basic_json/push_back/#complexity","title":"Complexity","text":"
    1. Amortized constant.
    2. Logarithmic in the size of the container, O(log(size())).
    3. Linear in the size of the initializer list init.
    "},{"location":"api/basic_json/push_back/#notes","title":"Notes","text":"

    (3) This function is required to resolve an ambiguous overload error, because pairs like {\"key\", \"value\"} can be both interpreted as object_t::value_type or std::initializer_list<basic_json>, see #235 for more information.

    "},{"location":"api/basic_json/push_back/#examples","title":"Examples","text":"Example: (1) add element to array

    The example shows how push_back() and += can be used to add elements to a JSON array. Note how the null value was silently converted to a JSON array.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // create JSON values\n    json array = {1, 2, 3, 4, 5};\n    json null;\n\n    // print values\n    std::cout << array << '\\n';\n    std::cout << null << '\\n';\n\n    // add values\n    array.push_back(6);\n    array += 7;\n    null += \"first\";\n    null += \"second\";\n\n    // print values\n    std::cout << array << '\\n';\n    std::cout << null << '\\n';\n}\n

    Output:

    [1,2,3,4,5]\nnull\n[1,2,3,4,5,6,7]\n[\"first\",\"second\"]\n
    Example: (2) add element to object

    The example shows how push_back() and += can be used to add elements to a JSON object. Note how the null value was silently converted to a JSON object.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // create JSON values\n    json object = {{\"one\", 1}, {\"two\", 2}};\n    json null;\n\n    // print values\n    std::cout << object << '\\n';\n    std::cout << null << '\\n';\n\n    // add values\n    object.push_back(json::object_t::value_type(\"three\", 3));\n    object += json::object_t::value_type(\"four\", 4);\n    null += json::object_t::value_type(\"A\", \"a\");\n    null += json::object_t::value_type(\"B\", \"b\");\n\n    // print values\n    std::cout << object << '\\n';\n    std::cout << null << '\\n';\n}\n

    Output:

    {\"one\":1,\"two\":2}\nnull\n{\"four\":4,\"one\":1,\"three\":3,\"two\":2}\n{\"A\":\"a\",\"B\":\"b\"}\n
    Example: (3) add to object from initializer list

    The example shows how initializer lists are treated as objects when possible.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // create JSON values\n    json object = {{\"one\", 1}, {\"two\", 2}};\n    json null;\n\n    // print values\n    std::cout << object << '\\n';\n    std::cout << null << '\\n';\n\n    // add values:\n    object.push_back({\"three\", 3});  // object is extended\n    object += {\"four\", 4};           // object is extended\n    null.push_back({\"five\", 5});     // null is converted to array\n\n    // print values\n    std::cout << object << '\\n';\n    std::cout << null << '\\n';\n\n    // would throw:\n    //object.push_back({1, 2, 3});\n}\n

    Output:

    {\"one\":1,\"two\":2}\nnull\n{\"four\":4,\"one\":1,\"three\":3,\"two\":2}\n[[\"five\",5]]\n
    "},{"location":"api/basic_json/push_back/#see-also","title":"See also","text":"
    • emplace_back add a value to an array
    • operator+= add a value to an array/object
    "},{"location":"api/basic_json/push_back/#version-history","title":"Version history","text":"
    1. Since version 1.0.0.
    2. Since version 1.0.0.
    3. Since version 2.0.0.
    "},{"location":"api/basic_json/rbegin/","title":"nlohmann::basic_json::rbegin","text":"
    reverse_iterator rbegin() noexcept;\nconst_reverse_iterator rbegin() const noexcept;\n

    Returns an iterator to the reverse-beginning; that is, the last element.

    "},{"location":"api/basic_json/rbegin/#return-value","title":"Return value","text":"

    reverse iterator to the first element

    "},{"location":"api/basic_json/rbegin/#exception-safety","title":"Exception safety","text":"

    No-throw guarantee: this member function never throws exceptions.

    "},{"location":"api/basic_json/rbegin/#complexity","title":"Complexity","text":"

    Constant.

    "},{"location":"api/basic_json/rbegin/#examples","title":"Examples","text":"Example

    The following code shows an example for rbegin().

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // create an array value\n    json array = {1, 2, 3, 4, 5};\n\n    // get an iterator to the reverse-beginning\n    json::reverse_iterator it = array.rbegin();\n\n    // serialize the element that the iterator points to\n    std::cout << *it << '\\n';\n}\n

    Output:

    5\n
    "},{"location":"api/basic_json/rbegin/#version-history","title":"Version history","text":"
    • Added in version 1.0.0.
    "},{"location":"api/basic_json/rend/","title":"nlohmann::basic_json::rend","text":"
    reverse_iterator rend() noexcept;\nconst_reverse_iterator rend() const noexcept;\n

    Returns an iterator to the reverse-end; that is, one before the first element. This element acts as a placeholder, attempting to access it results in undefined behavior.

    "},{"location":"api/basic_json/rend/#return-value","title":"Return value","text":"

    reverse iterator to the element following the last element

    "},{"location":"api/basic_json/rend/#exception-safety","title":"Exception safety","text":"

    No-throw guarantee: this member function never throws exceptions.

    "},{"location":"api/basic_json/rend/#complexity","title":"Complexity","text":"

    Constant.

    "},{"location":"api/basic_json/rend/#examples","title":"Examples","text":"Example

    The following code shows an example for eend().

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // create an array value\n    json array = {1, 2, 3, 4, 5};\n\n    // get an iterator to the reverse-end\n    json::reverse_iterator it = array.rend();\n\n    // increment the iterator to point to the first element\n    --it;\n\n    // serialize the element that the iterator points to\n    std::cout << *it << '\\n';\n}\n

    Output:

    1\n
    "},{"location":"api/basic_json/rend/#version-history","title":"Version history","text":"
    • Added in version 1.0.0.
    "},{"location":"api/basic_json/sax_parse/","title":"nlohmann::basic_json::sax_parse","text":"
    // (1)\ntemplate <typename InputType, typename SAX>\nstatic bool sax_parse(InputType&& i,\n                      SAX* sax,\n                      input_format_t format = input_format_t::json,\n                      const bool strict = true,\n                      const bool ignore_comments = false,\n                      const bool ignore_trailing_commas = false);\n\n// (2)\ntemplate<class IteratorType, class SAX>\nstatic bool sax_parse(IteratorType first, IteratorType last,\n                      SAX* sax,\n                      input_format_t format = input_format_t::json,\n                      const bool strict = true,\n                      const bool ignore_comments = false,\n                      const bool ignore_trailing_commas = false);\n

    Read from input and generate SAX events

    1. Read from a compatible input.

    2. Read from a pair of character iterators

      The value_type of the iterator must be an integral type with a size of 1, 2, or 4 bytes, which will be interpreted respectively as UTF-8, UTF-16, and UTF-32.

    The SAX event lister must follow the interface of json_sax.

    "},{"location":"api/basic_json/sax_parse/#template-parameters","title":"Template parameters","text":"InputType

    A compatible input, for instance:

    • an std::istream object
    • a FILE pointer
    • a C-style array of characters
    • a pointer to a null-terminated string of single byte characters
    • an object obj for which begin(obj) and end(obj) produces a valid pair of iterators.
    IteratorType Description SAX Description"},{"location":"api/basic_json/sax_parse/#parameters","title":"Parameters","text":"i (in) Input to parse from. sax (in) SAX event listener format (in) the format to parse (JSON, CBOR, MessagePack, or UBJSON) (optional, input_format_t::json by default), see input_format_t for more information strict (in) whether the input has to be consumed completely (optional, true by default) ignore_comments (in) whether comments should be ignored and treated like whitespace (true) or yield a parse error (false); (optional, false by default) ignore_trailing_commas (in) whether trailing commas in arrays or objects should be ignored and treated like whitespace (true) or yield a parse error (false); (optional, false by default) first (in) iterator to the start of a character range last (in) iterator to the end of a character range"},{"location":"api/basic_json/sax_parse/#return-value","title":"Return value","text":"

    return value of the last processed SAX event

    "},{"location":"api/basic_json/sax_parse/#exception-safety","title":"Exception safety","text":""},{"location":"api/basic_json/sax_parse/#complexity","title":"Complexity","text":"

    Linear in the length of the input. The parser is a predictive LL(1) parser. The complexity can be higher if the SAX consumer sax has a super-linear complexity.

    "},{"location":"api/basic_json/sax_parse/#notes","title":"Notes","text":"

    A UTF-8 byte order mark is silently ignored.

    "},{"location":"api/basic_json/sax_parse/#examples","title":"Examples","text":"Example

    The example below demonstrates the sax_parse() function reading from string and processing the events with a user-defined SAX event consumer.

    #include <iostream>\n#include <iomanip>\n#include <sstream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\n// a simple event consumer that collects string representations of the passed\n// values; note inheriting from json::json_sax_t is not required, but can\n// help not to forget a required function\nclass sax_event_consumer : public json::json_sax_t\n{\n  public:\n    std::vector<std::string> events;\n\n    bool null() override\n    {\n        events.push_back(\"null()\");\n        return true;\n    }\n\n    bool boolean(bool val) override\n    {\n        events.push_back(\"boolean(val=\" + std::string(val ? \"true\" : \"false\") + \")\");\n        return true;\n    }\n\n    bool number_integer(number_integer_t val) override\n    {\n        events.push_back(\"number_integer(val=\" + std::to_string(val) + \")\");\n        return true;\n    }\n\n    bool number_unsigned(number_unsigned_t val) override\n    {\n        events.push_back(\"number_unsigned(val=\" + std::to_string(val) + \")\");\n        return true;\n    }\n\n    bool number_float(number_float_t val, const string_t& s) override\n    {\n        events.push_back(\"number_float(val=\" + std::to_string(val) + \", s=\" + s + \")\");\n        return true;\n    }\n\n    bool string(string_t& val) override\n    {\n        events.push_back(\"string(val=\" + val + \")\");\n        return true;\n    }\n\n    bool start_object(std::size_t elements) override\n    {\n        events.push_back(\"start_object(elements=\" + std::to_string(elements) + \")\");\n        return true;\n    }\n\n    bool end_object() override\n    {\n        events.push_back(\"end_object()\");\n        return true;\n    }\n\n    bool start_array(std::size_t elements) override\n    {\n        events.push_back(\"start_array(elements=\" + std::to_string(elements) + \")\");\n        return true;\n    }\n\n    bool end_array() override\n    {\n        events.push_back(\"end_array()\");\n        return true;\n    }\n\n    bool key(string_t& val) override\n    {\n        events.push_back(\"key(val=\" + val + \")\");\n        return true;\n    }\n\n    bool binary(json::binary_t& val) override\n    {\n        events.push_back(\"binary(val=[...])\");\n        return true;\n    }\n\n    bool parse_error(std::size_t position, const std::string& last_token, const json::exception& ex) override\n    {\n        events.push_back(\"parse_error(position=\" + std::to_string(position) + \", last_token=\" + last_token + \",\\n            ex=\" + std::string(ex.what()) + \")\");\n        return false;\n    }\n};\n\nint main()\n{\n    // a JSON text\n    auto text = R\"(\n    {\n        \"Image\": {\n            \"Width\":  800,\n            \"Height\": 600,\n            \"Title\":  \"View from 15th Floor\",\n            \"Thumbnail\": {\n                \"Url\":    \"http://www.example.com/image/481989943\",\n                \"Height\": 125,\n                \"Width\":  100\n            },\n            \"Animated\" : false,\n            \"IDs\": [116, 943, 234, -38793],\n            \"DeletionDate\": null,\n            \"Distance\": 12.723374634\n        }\n    }]\n    )\";\n\n    // create a SAX event consumer object\n    sax_event_consumer sec;\n\n    // parse JSON\n    bool result = json::sax_parse(text, &sec);\n\n    // output the recorded events\n    for (auto& event : sec.events)\n    {\n        std::cout << event << \"\\n\";\n    }\n\n    // output the result of sax_parse\n    std::cout << \"\\nresult: \" << std::boolalpha << result << std::endl;\n}\n

    Output:

    start_object(elements=18446744073709551615)\nkey(val=Image)\nstart_object(elements=18446744073709551615)\nkey(val=Width)\nnumber_unsigned(val=800)\nkey(val=Height)\nnumber_unsigned(val=600)\nkey(val=Title)\nstring(val=View from 15th Floor)\nkey(val=Thumbnail)\nstart_object(elements=18446744073709551615)\nkey(val=Url)\nstring(val=http://www.example.com/image/481989943)\nkey(val=Height)\nnumber_unsigned(val=125)\nkey(val=Width)\nnumber_unsigned(val=100)\nend_object()\nkey(val=Animated)\nboolean(val=false)\nkey(val=IDs)\nstart_array(elements=18446744073709551615)\nnumber_unsigned(val=116)\nnumber_unsigned(val=943)\nnumber_unsigned(val=234)\nnumber_integer(val=-38793)\nend_array()\nkey(val=DeletionDate)\nnull()\nkey(val=Distance)\nnumber_float(val=12.723375, s=12.723374634)\nend_object()\nend_object()\nparse_error(position=460, last_token=12.723374634<U+000A>        }<U+000A>    }],\n            ex=[json.exception.parse_error.101] parse error at line 17, column 6: syntax error while parsing value - unexpected ']'; expected end of input)\n\nresult: false\n
    "},{"location":"api/basic_json/sax_parse/#version-history","title":"Version history","text":"
    • Added in version 3.2.0.
    • Ignoring comments via ignore_comments added in version 3.9.0.
    • Added ignore_trailing_commas in version 3.12.1.

    Deprecation

    Overload (2) replaces calls to sax_parse with a pair of iterators as their first parameter which has been deprecated in version 3.8.0. This overload will be removed in version 4.0.0. Please replace all calls like sax_parse({ptr, ptr+len}); with sax_parse(ptr, ptr+len);.

    "},{"location":"api/basic_json/size/","title":"nlohmann::basic_json::size","text":"
    size_type size() const noexcept;\n

    Returns the number of elements in a JSON value.

    "},{"location":"api/basic_json/size/#return-value","title":"Return value","text":"

    The return value depends on the different types and is defined as follows:

    Value type return value null 0 boolean 1 string 1 number 1 binary 1 object result of function object_t::size() array result of function array_t::size()"},{"location":"api/basic_json/size/#exception-safety","title":"Exception safety","text":"

    No-throw guarantee: this function never throws exceptions.

    "},{"location":"api/basic_json/size/#complexity","title":"Complexity","text":"

    Constant, as long as array_t and object_t satisfy the Container concept; that is, their size() functions have constant complexity.

    "},{"location":"api/basic_json/size/#notes","title":"Notes","text":"

    This function does not return the length of a string stored as JSON value -- it returns the number of elements in the JSON value which is 1 in the case of a string.

    "},{"location":"api/basic_json/size/#examples","title":"Examples","text":"Example

    The following code calls size() on the different value types.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // create JSON values\n    json j_null;\n    json j_boolean = true;\n    json j_number_integer = 17;\n    json j_number_float = 23.42;\n    json j_object = {{\"one\", 1}, {\"two\", 2}};\n    json j_object_empty(json::value_t::object);\n    json j_array = {1, 2, 4, 8, 16};\n    json j_array_empty(json::value_t::array);\n    json j_string = \"Hello, world\";\n\n    // call size()\n    std::cout << j_null.size() << '\\n';\n    std::cout << j_boolean.size() << '\\n';\n    std::cout << j_number_integer.size() << '\\n';\n    std::cout << j_number_float.size() << '\\n';\n    std::cout << j_object.size() << '\\n';\n    std::cout << j_object_empty.size() << '\\n';\n    std::cout << j_array.size() << '\\n';\n    std::cout << j_array_empty.size() << '\\n';\n    std::cout << j_string.size() << '\\n';\n}\n

    Output:

    0\n1\n1\n1\n2\n0\n5\n0\n1\n
    "},{"location":"api/basic_json/size/#version-history","title":"Version history","text":"
    • Added in version 1.0.0.
    • Extended to return 1 for binary types in version 3.8.0.
    "},{"location":"api/basic_json/start_pos/","title":"nlohmann::basic_json::start_pos","text":"
    #if JSON_DIAGNOSTIC_POSITIONS\nconstexpr std::size_t start_pos() const noexcept;\n#endif\n

    Returns the position of the first character in the JSON string from which the value was parsed from.

    JSON type return value object position of the opening { array position of the opening [ string position of the opening \" number position of the first character boolean position of t for true and f for false null position of n"},{"location":"api/basic_json/start_pos/#return-value","title":"Return value","text":"

    the position of the first character of the value in the parsed JSON string, if the value was created by the parse function, or std::string::npos if the value was constructed otherwise

    "},{"location":"api/basic_json/start_pos/#exception-safety","title":"Exception safety","text":"

    No-throw guarantee: this member function never throws exceptions.

    "},{"location":"api/basic_json/start_pos/#complexity","title":"Complexity","text":"

    Constant.

    "},{"location":"api/basic_json/start_pos/#notes","title":"Notes","text":"

    Note

    The function is only available if macro JSON_DIAGNOSTIC_POSITIONS has been defined to 1 before including the library header.

    Invalidation

    The returned positions are only valid as long as the JSON value is not changed. The positions are not updated when the JSON value is changed.

    "},{"location":"api/basic_json/start_pos/#examples","title":"Examples","text":"Example 
    #include <iostream>\n\n#define JSON_DIAGNOSTIC_POSITIONS 1\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    std::string json_string = R\"(\n    {\n        \"address\": {\n            \"street\": \"Fake Street\",\n            \"housenumber\": 1\n        }\n    }\n    )\";\n    json j = json::parse(json_string);\n\n    std::cout << \"Root diagnostic positions: \\n\";\n    std::cout << \"\\tstart_pos: \" << j.start_pos() << '\\n';\n    std::cout << \"\\tend_pos:\" << j.end_pos() << \"\\n\";\n    std::cout << \"Original string: \\n\";\n    std::cout << \"{\\n        \\\"address\\\": {\\n            \\\"street\\\": \\\"Fake Street\\\",\\n            \\\"housenumber\\\": 1\\n        }\\n    }\" << \"\\n\";\n    std::cout << \"Parsed string: \\n\";\n    std::cout << json_string.substr(j.start_pos(), j.end_pos() - j.start_pos()) << \"\\n\\n\";\n\n    std::cout << \"address diagnostic positions: \\n\";\n    std::cout << \"\\tstart_pos:\" << j[\"address\"].start_pos() << '\\n';\n    std::cout << \"\\tend_pos:\" << j[\"address\"].end_pos() << \"\\n\\n\";\n    std::cout << \"Original string: \\n\";\n    std::cout << \"{            \\\"street\\\": \\\"Fake Street\\\",\\n            \\\"housenumber\\\": 1\\n        }\" << \"\\n\";\n    std::cout << \"Parsed string: \\n\";\n    std::cout << json_string.substr(j[\"address\"].start_pos(), j[\"address\"].end_pos() - j[\"address\"].start_pos()) << \"\\n\\n\";\n\n    std::cout << \"street diagnostic positions: \\n\";\n    std::cout << \"\\tstart_pos:\" << j[\"address\"][\"street\"].start_pos() << '\\n';\n    std::cout << \"\\tend_pos:\" << j[\"address\"][\"street\"].end_pos() << \"\\n\\n\";\n    std::cout << \"Original string: \\n\";\n    std::cout << \"\\\"Fake Street\\\"\" << \"\\n\";\n    std::cout << \"Parsed string: \\n\";\n    std::cout << json_string.substr(j[\"address\"][\"street\"].start_pos(), j[\"address\"][\"street\"].end_pos() - j[\"address\"][\"street\"].start_pos()) << \"\\n\\n\";\n\n    std::cout << \"housenumber diagnostic positions: \\n\";\n    std::cout << \"\\tstart_pos:\" << j[\"address\"][\"housenumber\"].start_pos() << '\\n';\n    std::cout << \"\\tend_pos:\" << j[\"address\"][\"housenumber\"].end_pos() << \"\\n\\n\";\n    std::cout << \"Original string: \\n\";\n    std::cout << \"1\" << \"\\n\";\n    std::cout << \"Parsed string: \\n\";\n    std::cout << json_string.substr(j[\"address\"][\"housenumber\"].start_pos(), j[\"address\"][\"housenumber\"].end_pos() - j[\"address\"][\"housenumber\"].start_pos()) << \"\\n\\n\";\n}\n

    Output:

    Root diagnostic positions: \n    start_pos: 5\n    end_pos:109\nOriginal string: \n{\n        \"address\": {\n            \"street\": \"Fake Street\",\n            \"housenumber\": 1\n        }\n    }\nParsed string: \n{\n        \"address\": {\n            \"street\": \"Fake Street\",\n            \"housenumber\": 1\n        }\n    }\n\naddress diagnostic positions: \n    start_pos:26\n    end_pos:103\n\nOriginal string: \n{            \"street\": \"Fake Street\",\n            \"housenumber\": 1\n        }\nParsed string: \n{\n            \"street\": \"Fake Street\",\n            \"housenumber\": 1\n        }\n\nstreet diagnostic positions: \n    start_pos:50\n    end_pos:63\n\nOriginal string: \n\"Fake Street\"\nParsed string: \n\"Fake Street\"\n\nhousenumber diagnostic positions: \n    start_pos:92\n    end_pos:93\n\nOriginal string: \n1\nParsed string: \n1\n

    The output shows the start/end positions of all the objects and fields in the JSON string.

    "},{"location":"api/basic_json/start_pos/#see-also","title":"See also","text":"
    • end_pos to access the end position
    • JSON_DIAGNOSTIC_POSITIONS for an overview of the diagnostic positions
    "},{"location":"api/basic_json/start_pos/#version-history","title":"Version history","text":"
    • Added in version 3.12.0.
    "},{"location":"api/basic_json/std_hash/","title":"std::hash<nlohmann::basic_json>","text":"
    namespace std {\n    struct hash<nlohmann::basic_json>;\n}\n

    Return a hash value for a JSON object. The hash function tries to rely on std::hash where possible. Furthermore, the type of the JSON value is taken into account to have different hash values for null, 0, 0U, and false, etc.

    "},{"location":"api/basic_json/std_hash/#examples","title":"Examples","text":"Example

    The example shows how to calculate hash values for different JSON values.

    #include <iostream>\n#include <iomanip>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\nusing namespace nlohmann::literals;\n\nint main()\n{\n    std::cout << \"hash(null) = \" << std::hash<json> {}(json(nullptr)) << '\\n'\n              << \"hash(false) = \" << std::hash<json> {}(json(false)) << '\\n'\n              << \"hash(0) = \" << std::hash<json> {}(json(0)) << '\\n'\n              << \"hash(0U) = \" << std::hash<json> {}(json(0U)) << '\\n'\n              << \"hash(\\\"\\\") = \" << std::hash<json> {}(json(\"\")) << '\\n'\n              << \"hash({}) = \" << std::hash<json> {}(json::object()) << '\\n'\n              << \"hash([]) = \" << std::hash<json> {}(json::array()) << '\\n'\n              << \"hash({\\\"hello\\\": \\\"world\\\"}) = \" << std::hash<json> {}(\"{\\\"hello\\\": \\\"world\\\"}\"_json)\n              << std::endl;\n}\n

    Output:

    hash(null) = 2654435769\nhash(false) = 2654436030\nhash(0) = 2654436095\nhash(0U) = 2654436156\nhash(\"\") = 6142509191626859748\nhash({}) = 2654435832\nhash([]) = 2654435899\nhash({\"hello\": \"world\"}) = 4469488738203676328\n

    Note the output is platform-dependent.

    "},{"location":"api/basic_json/std_hash/#version-history","title":"Version history","text":"
    • Added in version 1.0.0.
    • Extended for arbitrary basic_json types in version 3.10.5.
    "},{"location":"api/basic_json/std_swap/","title":"std::swap<basic_json>","text":"
    namespace std {\n    void swap(nlohmann::basic_json& j1, nlohmann::basic_json& j2);\n}\n

    Exchanges the values of two JSON objects.

    "},{"location":"api/basic_json/std_swap/#parameters","title":"Parameters","text":"j1 (in, out) value to be replaced by j2 j2 (in, out) value to be replaced by j1"},{"location":"api/basic_json/std_swap/#possible-implementation","title":"Possible implementation","text":"
    void swap(nlohmann::basic_json& j1, nlohmann::basic_json& j2)\n{\n    j1.swap(j2);\n}\n
    "},{"location":"api/basic_json/std_swap/#examples","title":"Examples","text":"Example

    The following code shows how two values are swapped with std::swap.

    #include <iostream>\n#include <iomanip>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // create JSON values\n    json j1 = {{\"one\", 1}, {\"two\", 2}};\n    json j2 = {1, 2, 4, 8, 16};\n\n    std::cout << \"j1 = \" << j1 << \" | j2 = \" << j2 << '\\n';\n\n    // swap values\n    std::swap(j1, j2);\n\n    std::cout << \"j1 = \" << j1 << \" | j2 = \" << j2 << std::endl;\n}\n

    Output:

    j1 = {\"one\":1,\"two\":2} | j2 = [1,2,4,8,16]\nj1 = [1,2,4,8,16] | j2 = {\"one\":1,\"two\":2}\n
    "},{"location":"api/basic_json/std_swap/#see-also","title":"See also","text":"
    • swap
    "},{"location":"api/basic_json/std_swap/#version-history","title":"Version history","text":"
    • Added in version 1.0.0.
    • Extended for arbitrary basic_json types in version 3.10.5.
    "},{"location":"api/basic_json/string_t/","title":"nlohmann::basic_json::string_t","text":"
    using string_t = StringType;\n

    The type used to store JSON strings.

    RFC 8259 describes JSON strings as follows:

    A string is a sequence of zero or more Unicode characters.

    To store objects in C++, a type is defined by the template parameter described below. Unicode values are split by the JSON class into byte-sized characters during deserialization.

    "},{"location":"api/basic_json/string_t/#template-parameters","title":"Template parameters","text":"StringType the container to store strings (e.g., std::string). Note this container is used for keys/names in objects, see object_t."},{"location":"api/basic_json/string_t/#notes","title":"Notes","text":""},{"location":"api/basic_json/string_t/#default-type","title":"Default type","text":"

    With the default values for StringType (std::string), the default value for string_t is std::string.

    "},{"location":"api/basic_json/string_t/#encoding","title":"Encoding","text":"

    Strings are stored in UTF-8 encoding. Therefore, functions like std::string::size() or std::string::length() return the number of bytes in the string rather than the number of characters or glyphs.

    "},{"location":"api/basic_json/string_t/#string-comparison","title":"String comparison","text":"

    RFC 8259 states:

    Software implementations are typically required to test names of object members for equality. Implementations that transform the textual representation into sequences of Unicode code units and then perform the comparison numerically, code unit by code unit, are interoperable in the sense that implementations will agree in all cases on equality or inequality of two strings. For example, implementations that compare strings with escaped characters unconverted may incorrectly find that \"a\\\\b\" and \"a\\u005Cb\" are not equal.

    This implementation is interoperable as it does compare strings code unit by code unit.

    "},{"location":"api/basic_json/string_t/#storage","title":"Storage","text":"

    String values are stored as pointers in a basic_json type. That is, for any access to string values, a pointer of type string_t* must be dereferenced.

    "},{"location":"api/basic_json/string_t/#examples","title":"Examples","text":"Example

    The following code shows that string_t is by default, a typedef to std::string.

    #include <iostream>\n#include <iomanip>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    std::cout << std::boolalpha << std::is_same<std::string, json::string_t>::value << std::endl;\n}\n

    Output:

    true\n
    "},{"location":"api/basic_json/string_t/#version-history","title":"Version history","text":"
    • Added in version 1.0.0.
    "},{"location":"api/basic_json/swap/","title":"nlohmann::basic_json::swap","text":"
    // (1)\nvoid swap(reference other) noexcept;\n\n// (2)\nvoid swap(reference left, reference right) noexcept;\n\n// (3)\nvoid swap(array_t& other);\n\n// (4)\nvoid swap(object_t& other);\n\n// (5)\nvoid swap(string_t& other);\n\n// (6)\nvoid swap(binary_t& other);\n\n// (7)\nvoid swap(typename binary_t::container_type& other);\n
    1. Exchanges the contents of the JSON value with those of other. Does not invoke any move, copy, or swap operations on individual elements. All iterators and references remain valid. The past-the-end iterator is invalidated.
    2. Exchanges the contents of the JSON value from left with those of right. Does not invoke any move, copy, or swap operations on individual elements. All iterators and references remain valid. The past-the-end iterator is invalidated. Implemented as a friend function callable via ADL.
    3. Exchanges the contents of a JSON array with those of other. Does not invoke any move, copy, or swap operations on individual elements. All iterators and references remain valid. The past-the-end iterator is invalidated.
    4. Exchanges the contents of a JSON object with those of other. Does not invoke any move, copy, or swap operations on individual elements. All iterators and references remain valid. The past-the-end iterator is invalidated.
    5. Exchanges the contents of a JSON string with those of other. Does not invoke any move, copy, or swap operations on individual elements. All iterators and references remain valid. The past-the-end iterator is invalidated.
    6. Exchanges the contents of a binary value with those of other. Does not invoke any move, copy, or swap operations on individual elements. All iterators and references remain valid. The past-the-end iterator is invalidated.
    7. Exchanges the contents of a binary value with those of other. Does not invoke any move, copy, or swap operations on individual elements. All iterators and references remain valid. The past-the-end iterator is invalidated. Unlike version (6), no binary subtype is involved.
    "},{"location":"api/basic_json/swap/#parameters","title":"Parameters","text":"other (in, out) value to exchange the contents with left (in, out) value to exchange the contents with right (in, out) value to exchange the contents with"},{"location":"api/basic_json/swap/#exceptions","title":"Exceptions","text":"
    1. No-throw guarantee: this function never throws exceptions.
    2. No-throw guarantee: this function never throws exceptions.
    3. Throws type_error.310 if called on JSON values other than arrays; example: \"cannot use swap() with boolean\"
    4. Throws type_error.310 if called on JSON values other than objects; example: \"cannot use swap() with boolean\"
    5. Throws type_error.310 if called on JSON values other than strings; example: \"cannot use swap() with boolean\"
    6. Throws type_error.310 if called on JSON values other than binaries; example: \"cannot use swap() with boolean\"
    7. Throws type_error.310 if called on JSON values other than binaries; example: \"cannot use swap() with boolean\"
    "},{"location":"api/basic_json/swap/#complexity","title":"Complexity","text":"

    Constant.

    "},{"location":"api/basic_json/swap/#examples","title":"Examples","text":"Example: Swap JSON value (1, 2)

    The example below shows how JSON values can be swapped with swap().

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // create two JSON values\n    json j1 = {1, 2, 3, 4, 5};\n    json j2 = {{\"pi\", 3.141592653589793}, {\"e\", 2.718281828459045}};\n\n    // swap the values\n    j1.swap(j2);\n\n    // output the values\n    std::cout << \"j1 = \" << j1 << '\\n';\n    std::cout << \"j2 = \" << j2 << '\\n';\n}\n

    Output:

    j1 = {\"e\":2.718281828459045,\"pi\":3.141592653589793}\nj2 = [1,2,3,4,5]\n
    Example: Swap array (3)

    The example below shows how arrays can be swapped with swap().

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // create a JSON value\n    json value = {{\"array\", {1, 2, 3, 4}}};\n\n    // create an array_t\n    json::array_t array = {\"Snap\", \"Crackle\", \"Pop\"};\n\n    // swap the array stored in the JSON value\n    value[\"array\"].swap(array);\n\n    // output the values\n    std::cout << \"value = \" << value << '\\n';\n    std::cout << \"array = \" << array << '\\n';\n}\n

    Output:

    value = {\"array\":[\"Snap\",\"Crackle\",\"Pop\"]}\narray = [1,2,3,4]\n
    Example: Swap object (4)

    The example below shows how objects can be swapped with swap().

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // create a JSON value\n    json value = { {\"translation\", {{\"one\", \"eins\"}, {\"two\", \"zwei\"}}} };\n\n    // create an object_t\n    json::object_t object = {{\"cow\", \"Kuh\"}, {\"dog\", \"Hund\"}};\n\n    // swap the object stored in the JSON value\n    value[\"translation\"].swap(object);\n\n    // output the values\n    std::cout << \"value = \" << value << '\\n';\n    std::cout << \"object = \" << object << '\\n';\n}\n

    Output:

    value = {\"translation\":{\"cow\":\"Kuh\",\"dog\":\"Hund\"}}\nobject = {\"one\":\"eins\",\"two\":\"zwei\"}\n
    Example: Swap string (5)

    The example below shows how strings can be swapped with swap().

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // create a JSON value\n    json value = { \"the good\", \"the bad\", \"the ugly\" };\n\n    // create string_t\n    json::string_t string = \"the fast\";\n\n    // swap the object stored in the JSON value\n    value[1].swap(string);\n\n    // output the values\n    std::cout << \"value = \" << value << '\\n';\n    std::cout << \"string = \" << string << '\\n';\n}\n

    Output:

    value = [\"the good\",\"the fast\",\"the ugly\"]\nstring = the bad\n
    Example: Swap string (6)

    The example below shows how binary values can be swapped with swap().

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // create a binary value\n    json value = json::binary({1, 2, 3});\n\n    // create a binary_t\n    json::binary_t binary = {{4, 5, 6}};\n\n    // swap the object stored in the JSON value\n    value.swap(binary);\n\n    // output the values\n    std::cout << \"value = \" << value << '\\n';\n    std::cout << \"binary = \" << json(binary) << '\\n';\n}\n

    Output:

    value = {\"bytes\":[4,5,6],\"subtype\":null}\nbinary = {\"bytes\":[1,2,3],\"subtype\":null}\n
    "},{"location":"api/basic_json/swap/#see-also","title":"See also","text":"
    • std::swap<basic_json>
    "},{"location":"api/basic_json/swap/#version-history","title":"Version history","text":"
    1. Since version 1.0.0.
    2. Since version 1.0.0.
    3. Since version 1.0.0.
    4. Since version 1.0.0.
    5. Since version 1.0.0.
    6. Since version 3.8.0.
    7. Since version 3.8.0.
    "},{"location":"api/basic_json/to_bjdata/","title":"nlohmann::basic_json::to_bjdata","text":"
    // (1)\nstatic std::vector<std::uint8_t> to_bjdata(const basic_json& j,\n                                           const bool use_size = false,\n                                           const bool use_type = false,\n                                           const bjdata_version_t version = bjdata_version_t::draft2);\n\n// (2)\nstatic void to_bjdata(const basic_json& j, detail::output_adapter<std::uint8_t> o,\n                      const bool use_size = false, const bool use_type = false,\n                      const bjdata_version_t version = bjdata_version_t::draft2);\nstatic void to_bjdata(const basic_json& j, detail::output_adapter<char> o,\n                      const bool use_size = false, const bool use_type = false,\n                      const bjdata_version_t version = bjdata_version_t::draft2);\n

    Serializes a given JSON value j to a byte vector using the BJData (Binary JData) serialization format. BJData aims to be more compact than JSON itself, yet more efficient to parse.

    1. Returns a byte vector containing the BJData serialization.
    2. Writes the BJData serialization to an output adapter.

    The exact mapping and its limitations are described on a dedicated page.

    "},{"location":"api/basic_json/to_bjdata/#parameters","title":"Parameters","text":"j (in) JSON value to serialize o (in) output adapter to write serialization to use_size (in) whether to add size annotations to container types; optional, false by default. use_type (in) whether to add type annotations to container types (must be combined with use_size = true); optional, false by default. version (in) which version of BJData to use (see note on \"Binary values\" on BJData); optional, bjdata_version_t::draft2 by default."},{"location":"api/basic_json/to_bjdata/#return-value","title":"Return value","text":"
    1. BJData serialization as byte vector
    2. (none)
    "},{"location":"api/basic_json/to_bjdata/#exception-safety","title":"Exception safety","text":"

    Strong guarantee: if an exception is thrown, there are no changes in the JSON value.

    "},{"location":"api/basic_json/to_bjdata/#complexity","title":"Complexity","text":"

    Linear in the size of the JSON value j.

    "},{"location":"api/basic_json/to_bjdata/#examples","title":"Examples","text":"Example

    The example shows the serialization of a JSON value to a byte vector in BJData format.

    #include <iostream>\n#include <iomanip>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\nusing namespace nlohmann::literals;\n\n// function to print BJData's diagnostic format\nvoid print_byte(uint8_t byte)\n{\n    if (32 < byte and byte < 128)\n    {\n        std::cout << (char)byte;\n    }\n    else\n    {\n        std::cout << (int)byte;\n    }\n}\n\nint main()\n{\n    // create a JSON value\n    json j = R\"({\"compact\": true, \"schema\": false})\"_json;\n\n    // serialize it to BJData\n    std::vector<std::uint8_t> v = json::to_bjdata(j);\n\n    // print the vector content\n    for (auto& byte : v)\n    {\n        print_byte(byte);\n    }\n    std::cout << std::endl;\n\n    // create an array of numbers\n    json array = {1, 2, 3, 4, 5, 6, 7, 8};\n\n    // serialize it to BJData using default representation\n    std::vector<std::uint8_t> v_array = json::to_bjdata(array);\n    // serialize it to BJData using size optimization\n    std::vector<std::uint8_t> v_array_size = json::to_bjdata(array, true);\n    // serialize it to BJData using type optimization\n    std::vector<std::uint8_t> v_array_size_and_type = json::to_bjdata(array, true, true);\n\n    // print the vector contents\n    for (auto& byte : v_array)\n    {\n        print_byte(byte);\n    }\n    std::cout << std::endl;\n\n    for (auto& byte : v_array_size)\n    {\n        print_byte(byte);\n    }\n    std::cout << std::endl;\n\n    for (auto& byte : v_array_size_and_type)\n    {\n        print_byte(byte);\n    }\n    std::cout << std::endl;\n}\n

    Output:

    {i7compactTi6schemaF}\n[i1i2i3i4i5i6i7i8]\n[#i8i1i2i3i4i5i6i7i8\n[$i#i812345678\n
    "},{"location":"api/basic_json/to_bjdata/#version-history","title":"Version history","text":"
    • Added in version 3.11.0.
    • BJData version parameter (for draft3 binary encoding) added in version 3.12.0.
    "},{"location":"api/basic_json/to_bson/","title":"nlohmann::basic_json::to_bson","text":"
    // (1)\nstatic std::vector<std::uint8_t> to_bson(const basic_json& j);\n\n// (2)\nstatic void to_bson(const basic_json& j, detail::output_adapter<std::uint8_t> o);\nstatic void to_bson(const basic_json& j, detail::output_adapter<char> o);\n

    BSON (Binary JSON) is a binary format in which zero or more ordered key/value pairs are stored as a single entity (a so-called document).

    1. Returns a byte vector containing the BSON serialization.
    2. Writes the BSON serialization to an output adapter.

    The exact mapping and its limitations are described on a dedicated page.

    "},{"location":"api/basic_json/to_bson/#parameters","title":"Parameters","text":"j (in) JSON value to serialize o (in) output adapter to write serialization to"},{"location":"api/basic_json/to_bson/#return-value","title":"Return value","text":"
    1. BSON serialization as a byte vector
    2. (none)
    "},{"location":"api/basic_json/to_bson/#exception-safety","title":"Exception safety","text":"

    Strong guarantee: if an exception is thrown, there are no changes in the JSON value.

    "},{"location":"api/basic_json/to_bson/#complexity","title":"Complexity","text":"

    Linear in the size of the JSON value j.

    "},{"location":"api/basic_json/to_bson/#examples","title":"Examples","text":"Example

    The example shows the serialization of a JSON value to a byte vector in BSON format.

    #include <iostream>\n#include <iomanip>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\nusing namespace nlohmann::literals;\n\nint main()\n{\n    // create a JSON value\n    json j = R\"({\"compact\": true, \"schema\": 0})\"_json;\n\n    // serialize it to BSON\n    std::vector<std::uint8_t> v = json::to_bson(j);\n\n    // print the vector content\n    for (auto& byte : v)\n    {\n        std::cout << \"0x\" << std::hex << std::setw(2) << std::setfill('0') << (int)byte << \" \";\n    }\n    std::cout << std::endl;\n}\n

    Output:

    0x1b 0x00 0x00 0x00 0x08 0x63 0x6f 0x6d 0x70 0x61 0x63 0x74 0x00 0x01 0x10 0x73 0x63 0x68 0x65 0x6d 0x61 0x00 0x00 0x00 0x00 0x00 0x00 \n
    "},{"location":"api/basic_json/to_bson/#version-history","title":"Version history","text":"
    • Added in version 3.4.0.
    "},{"location":"api/basic_json/to_cbor/","title":"nlohmann::basic_json::to_cbor","text":"
    // (1)\nstatic std::vector<std::uint8_t> to_cbor(const basic_json& j);\n\n// (2)\nstatic void to_cbor(const basic_json& j, detail::output_adapter<std::uint8_t> o);\nstatic void to_cbor(const basic_json& j, detail::output_adapter<char> o);\n

    Serializes a given JSON value j to a byte vector using the CBOR (Concise Binary Object Representation) serialization format. CBOR is a binary serialization format that aims to be more compact than JSON itself, yet more efficient to parse.

    1. Returns a byte vector containing the CBOR serialization.
    2. Writes the CBOR serialization to an output adapter.

    The exact mapping and its limitations are described on a dedicated page.

    "},{"location":"api/basic_json/to_cbor/#parameters","title":"Parameters","text":"j (in) JSON value to serialize o (in) output adapter to write serialization to"},{"location":"api/basic_json/to_cbor/#return-value","title":"Return value","text":"
    1. CBOR serialization as a byte vector
    2. (none)
    "},{"location":"api/basic_json/to_cbor/#exception-safety","title":"Exception safety","text":"

    Strong guarantee: if an exception is thrown, there are no changes in the JSON value.

    "},{"location":"api/basic_json/to_cbor/#complexity","title":"Complexity","text":"

    Linear in the size of the JSON value j.

    "},{"location":"api/basic_json/to_cbor/#examples","title":"Examples","text":"Example

    The example shows the serialization of a JSON value to a byte vector in CBOR format.

    #include <iostream>\n#include <iomanip>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\nusing namespace nlohmann::literals;\n\nint main()\n{\n    // create a JSON value\n    json j = R\"({\"compact\": true, \"schema\": 0})\"_json;\n\n    // serialize it to CBOR\n    std::vector<std::uint8_t> v = json::to_cbor(j);\n\n    // print the vector content\n    for (auto& byte : v)\n    {\n        std::cout << \"0x\" << std::hex << std::setw(2) << std::setfill('0') << (int)byte << \" \";\n    }\n    std::cout << std::endl;\n}\n

    Output:

    0xa2 0x67 0x63 0x6f 0x6d 0x70 0x61 0x63 0x74 0xf5 0x66 0x73 0x63 0x68 0x65 0x6d 0x61 0x00 \n
    "},{"location":"api/basic_json/to_cbor/#version-history","title":"Version history","text":"
    • Added in version 2.0.9.
    • Compact representation of floating-point numbers added in version 3.8.0.
    "},{"location":"api/basic_json/to_msgpack/","title":"nlohmann::basic_json::to_msgpack","text":"
    // (1)\nstatic std::vector<std::uint8_t> to_msgpack(const basic_json& j);\n\n// (2)\nstatic void to_msgpack(const basic_json& j, detail::output_adapter<std::uint8_t> o);\nstatic void to_msgpack(const basic_json& j, detail::output_adapter<char> o);\n

    Serializes a given JSON value j to a byte vector using the MessagePack serialization format. MessagePack is a binary serialization format that aims to be more compact than JSON itself, yet more efficient to parse.

    1. Returns a byte vector containing the MessagePack serialization.
    2. Writes the MessagePack serialization to an output adapter.

    The exact mapping and its limitations are described on a dedicated page.

    "},{"location":"api/basic_json/to_msgpack/#parameters","title":"Parameters","text":"j (in) JSON value to serialize o (in) output adapter to write serialization to"},{"location":"api/basic_json/to_msgpack/#return-value","title":"Return value","text":"
    1. MessagePack serialization as a byte vector
    2. (none)
    "},{"location":"api/basic_json/to_msgpack/#exception-safety","title":"Exception safety","text":"

    Strong guarantee: if an exception is thrown, there are no changes in the JSON value.

    "},{"location":"api/basic_json/to_msgpack/#complexity","title":"Complexity","text":"

    Linear in the size of the JSON value j.

    "},{"location":"api/basic_json/to_msgpack/#examples","title":"Examples","text":"Example

    The example shows the serialization of a JSON value to a byte vector in MessagePack format.

    #include <iostream>\n#include <iomanip>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\nusing namespace nlohmann::literals;\n\nint main()\n{\n    // create a JSON value\n    json j = R\"({\"compact\": true, \"schema\": 0})\"_json;\n\n    // serialize it to MessagePack\n    std::vector<std::uint8_t> v = json::to_msgpack(j);\n\n    // print the vector content\n    for (auto& byte : v)\n    {\n        std::cout << \"0x\" << std::hex << std::setw(2) << std::setfill('0') << (int)byte << \" \";\n    }\n    std::cout << std::endl;\n}\n

    Output:

    0x82 0xa7 0x63 0x6f 0x6d 0x70 0x61 0x63 0x74 0xc3 0xa6 0x73 0x63 0x68 0x65 0x6d 0x61 0x00 \n
    "},{"location":"api/basic_json/to_msgpack/#version-history","title":"Version history","text":"
    • Added in version 2.0.9.
    "},{"location":"api/basic_json/to_string/","title":"to_string(basic_json)","text":"
    template <typename BasicJsonType>\nstd::string to_string(const BasicJsonType& j);\n

    This function implements a user-defined to_string for JSON objects.

    "},{"location":"api/basic_json/to_string/#template-parameters","title":"Template parameters","text":"BasicJsonType a specialization of basic_json"},{"location":"api/basic_json/to_string/#return-value","title":"Return value","text":"

    string containing the serialization of the JSON value

    "},{"location":"api/basic_json/to_string/#exception-safety","title":"Exception safety","text":"

    Strong guarantee: if an exception is thrown, there are no changes to any JSON value.

    "},{"location":"api/basic_json/to_string/#exceptions","title":"Exceptions","text":"

    Throws type_error.316 if a string stored inside the JSON value is not UTF-8 encoded

    "},{"location":"api/basic_json/to_string/#complexity","title":"Complexity","text":"

    Linear.

    "},{"location":"api/basic_json/to_string/#possible-implementation","title":"Possible implementation","text":"
    template <typename BasicJsonType>\nstd::string to_string(const BasicJsonType& j)\n{\n    return j.dump();\n}\n
    "},{"location":"api/basic_json/to_string/#examples","title":"Examples","text":"Example

    The following code shows how the library's to_string() function integrates with others, allowing argument-dependent lookup.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\nusing std::to_string;\n\nint main()\n{\n    // create values\n    json j = {{\"one\", 1}, {\"two\", 2}};\n    int i = 42;\n\n    // use ADL to select best to_string function\n    auto j_str = to_string(j);  // calling nlohmann::to_string\n    auto i_str = to_string(i);  // calling std::to_string\n\n    // serialize without indentation\n    std::cout << j_str << \"\\n\\n\"\n              << i_str << std::endl;\n}\n

    Output:

    {\"one\":1,\"two\":2}\n\n42\n
    "},{"location":"api/basic_json/to_string/#see-also","title":"See also","text":"
    • dump
    "},{"location":"api/basic_json/to_string/#version-history","title":"Version history","text":"

    Added in version 3.7.0.

    "},{"location":"api/basic_json/to_ubjson/","title":"nlohmann::basic_json::to_ubjson","text":"
    // (1)\nstatic std::vector<std::uint8_t> to_ubjson(const basic_json& j,\n                                           const bool use_size = false,\n                                           const bool use_type = false);\n\n// (2)\nstatic void to_ubjson(const basic_json& j, detail::output_adapter<std::uint8_t> o,\n                      const bool use_size = false, const bool use_type = false);\nstatic void to_ubjson(const basic_json& j, detail::output_adapter<char> o,\n                      const bool use_size = false, const bool use_type = false);\n

    Serializes a given JSON value j to a byte vector using the UBJSON (Universal Binary JSON) serialization format. UBJSON aims to be more compact than JSON itself, yet more efficient to parse.

    1. Returns a byte vector containing the UBJSON serialization.
    2. Writes the UBJSON serialization to an output adapter.

    The exact mapping and its limitations are described on a dedicated page.

    "},{"location":"api/basic_json/to_ubjson/#parameters","title":"Parameters","text":"j (in) JSON value to serialize o (in) output adapter to write serialization to use_size (in) whether to add size annotations to container types; optional, false by default. use_type (in) whether to add type annotations to container types (must be combined with use_size = true); optional, false by default."},{"location":"api/basic_json/to_ubjson/#return-value","title":"Return value","text":"
    1. UBJSON serialization as a byte vector
    2. (none)
    "},{"location":"api/basic_json/to_ubjson/#exception-safety","title":"Exception safety","text":"

    Strong guarantee: if an exception is thrown, there are no changes in the JSON value.

    "},{"location":"api/basic_json/to_ubjson/#complexity","title":"Complexity","text":"

    Linear in the size of the JSON value j.

    "},{"location":"api/basic_json/to_ubjson/#examples","title":"Examples","text":"Example

    The example shows the serialization of a JSON value to a byte vector in UBJSON format.

    #include <iostream>\n#include <iomanip>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\nusing namespace nlohmann::literals;\n\n// function to print UBJSON's diagnostic format\nvoid print_byte(uint8_t byte)\n{\n    if (32 < byte and byte < 128)\n    {\n        std::cout << (char)byte;\n    }\n    else\n    {\n        std::cout << (int)byte;\n    }\n}\n\nint main()\n{\n    // create a JSON value\n    json j = R\"({\"compact\": true, \"schema\": false})\"_json;\n\n    // serialize it to UBJSON\n    std::vector<std::uint8_t> v = json::to_ubjson(j);\n\n    // print the vector content\n    for (auto& byte : v)\n    {\n        print_byte(byte);\n    }\n    std::cout << std::endl;\n\n    // create an array of numbers\n    json array = {1, 2, 3, 4, 5, 6, 7, 8};\n\n    // serialize it to UBJSON using default representation\n    std::vector<std::uint8_t> v_array = json::to_ubjson(array);\n    // serialize it to UBJSON using size optimization\n    std::vector<std::uint8_t> v_array_size = json::to_ubjson(array, true);\n    // serialize it to UBJSON using type optimization\n    std::vector<std::uint8_t> v_array_size_and_type = json::to_ubjson(array, true, true);\n\n    // print the vector contents\n    for (auto& byte : v_array)\n    {\n        print_byte(byte);\n    }\n    std::cout << std::endl;\n\n    for (auto& byte : v_array_size)\n    {\n        print_byte(byte);\n    }\n    std::cout << std::endl;\n\n    for (auto& byte : v_array_size_and_type)\n    {\n        print_byte(byte);\n    }\n    std::cout << std::endl;\n}\n

    Output:

    {i7compactTi6schemaF}\n[i1i2i3i4i5i6i7i8]\n[#i8i1i2i3i4i5i6i7i8\n[$i#i812345678\n
    "},{"location":"api/basic_json/to_ubjson/#version-history","title":"Version history","text":"
    • Added in version 3.1.0.
    "},{"location":"api/basic_json/type/","title":"nlohmann::basic_json::type","text":"
    constexpr value_t type() const noexcept;\n

    Return the type of the JSON value as a value from the value_t enumeration.

    "},{"location":"api/basic_json/type/#return-value","title":"Return value","text":"

    the type of the JSON value

    Value type return value null value_t::null boolean value_t::boolean string value_t::string number (integer) value_t::number_integer number (unsigned integer) value_t::number_unsigned number (floating-point) value_t::number_float object value_t::object array value_t::array binary value_t::binary discarded value_t::discarded"},{"location":"api/basic_json/type/#exception-safety","title":"Exception safety","text":"

    No-throw guarantee: this member function never throws exceptions.

    "},{"location":"api/basic_json/type/#complexity","title":"Complexity","text":"

    Constant.

    "},{"location":"api/basic_json/type/#examples","title":"Examples","text":"Example

    The following code exemplifies type() for all JSON types.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // create JSON values\n    json j_null;\n    json j_boolean = true;\n    json j_number_integer = -17;\n    json j_number_unsigned = 42u;\n    json j_number_float = 23.42;\n    json j_object = {{\"one\", 1}, {\"two\", 2}};\n    json j_array = {1, 2, 4, 8, 16};\n    json j_string = \"Hello, world\";\n\n    // call type()\n    std::cout << std::boolalpha;\n    std::cout << (j_null.type() == json::value_t::null) << '\\n';\n    std::cout << (j_boolean.type() == json::value_t::boolean) << '\\n';\n    std::cout << (j_number_integer.type() == json::value_t::number_integer) << '\\n';\n    std::cout << (j_number_unsigned.type() == json::value_t::number_unsigned) << '\\n';\n    std::cout << (j_number_float.type() == json::value_t::number_float) << '\\n';\n    std::cout << (j_object.type() == json::value_t::object) << '\\n';\n    std::cout << (j_array.type() == json::value_t::array) << '\\n';\n    std::cout << (j_string.type() == json::value_t::string) << '\\n';\n}\n

    Output:

    true\ntrue\ntrue\ntrue\ntrue\ntrue\ntrue\ntrue\n
    "},{"location":"api/basic_json/type/#version-history","title":"Version history","text":"
    • Added in version 1.0.0.
    • Added unsigned integer type in version 2.0.0.
    • Added binary type in version 3.8.0.
    "},{"location":"api/basic_json/type_error/","title":"nlohmann::basic_json::type_error","text":"
    class type_error : public exception;\n

    This exception is thrown in case of a type error; that is, a library function is executed on a JSON value whose type does not match the expected semantics.

    Exceptions have ids 3xx (see list of type errors).

    classDiagram\n  direction LR\n\n    class std_exception [\"std::exception\"] {\n        <<interface>>\n    }\n\n    class json_exception [\"basic_json::exception\"] {\n        +const int id\n        +const char* what() const\n    }\n\n    class json_parse_error [\"basic_json::parse_error\"] {\n        +const std::size_t byte\n    }\n\n    class json_invalid_iterator [\"basic_json::invalid_iterator\"]\n    class json_type_error [\"basic_json::type_error\"]\n    class json_out_of_range [\"basic_json::out_of_range\"]\n    class json_other_error [\"basic_json::other_error\"]\n\n    std_exception <|-- json_exception\n    json_exception <|-- json_parse_error\n    json_exception <|-- json_invalid_iterator\n    json_exception <|-- json_type_error\n    json_exception <|-- json_out_of_range\n    json_exception <|-- json_other_error\n\n    style json_type_error fill:#CCCCFF
    "},{"location":"api/basic_json/type_error/#member-functions","title":"Member functions","text":"
    • what - returns explanatory string
    "},{"location":"api/basic_json/type_error/#member-variables","title":"Member variables","text":"
    • id - the id of the exception
    "},{"location":"api/basic_json/type_error/#examples","title":"Examples","text":"Example

    The following code shows how a type_error exception can be caught.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    try\n    {\n        // calling push_back() on a string value\n        json j = \"string\";\n        j.push_back(\"another string\");\n    }\n    catch (const json::type_error& e)\n    {\n        // output exception information\n        std::cout << \"message: \" << e.what() << '\\n'\n                  << \"exception id: \" << e.id << std::endl;\n    }\n}\n

    Output:

    message: [json.exception.type_error.308] cannot use push_back() with string\nexception id: 308\n
    "},{"location":"api/basic_json/type_error/#see-also","title":"See also","text":"
    • List of type errors
    • parse_error for exceptions indicating a parse error
    • invalid_iterator for exceptions indicating errors with iterators
    • out_of_range for exceptions indicating access out of the defined range
    • other_error for exceptions indicating other library errors
    "},{"location":"api/basic_json/type_error/#version-history","title":"Version history","text":"
    • Since version 3.0.0.
    "},{"location":"api/basic_json/type_name/","title":"nlohmann::basic_json::type_name","text":"
    const char* type_name() const noexcept;\n

    Returns the type name as string to be used in error messages -- usually to indicate that a function was called on a wrong JSON type.

    "},{"location":"api/basic_json/type_name/#return-value","title":"Return value","text":"

    a string representation of the type (value_t):

    Value type return value null \"null\" boolean \"boolean\" string \"string\" number (integer, unsigned integer, floating-point) \"number\" object \"object\" array \"array\" binary \"binary\" discarded \"discarded\""},{"location":"api/basic_json/type_name/#exception-safety","title":"Exception safety","text":"

    No-throw guarantee: this member function never throws exceptions.

    "},{"location":"api/basic_json/type_name/#complexity","title":"Complexity","text":"

    Constant.

    "},{"location":"api/basic_json/type_name/#examples","title":"Examples","text":"Example

    The following code exemplifies type_name() for all JSON types.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // create JSON values\n    json j_null;\n    json j_boolean = true;\n    json j_number_integer = -17;\n    json j_number_unsigned = 42u;\n    json j_number_float = 23.42;\n    json j_object = {{\"one\", 1}, {\"two\", 2}};\n    json j_array = {1, 2, 4, 8, 16};\n    json j_string = \"Hello, world\";\n\n    // call type_name()\n    std::cout << j_null << \" is a \" << j_null.type_name() << '\\n';\n    std::cout << j_boolean << \" is a \" << j_boolean.type_name() << '\\n';\n    std::cout << j_number_integer << \" is a \" << j_number_integer.type_name() << '\\n';\n    std::cout << j_number_unsigned << \" is a \" << j_number_unsigned.type_name() << '\\n';\n    std::cout << j_number_float << \" is a \" << j_number_float.type_name() << '\\n';\n    std::cout << j_object << \" is an \" << j_object.type_name() << '\\n';\n    std::cout << j_array << \" is an \" << j_array.type_name() << '\\n';\n    std::cout << j_string << \" is a \" << j_string.type_name() << '\\n';\n}\n

    Output:

    null is a null\ntrue is a boolean\n-17 is a number\n42 is a number\n23.42 is a number\n{\"one\":1,\"two\":2} is an object\n[1,2,4,8,16] is an array\n\"Hello, world\" is a string\n
    "},{"location":"api/basic_json/type_name/#version-history","title":"Version history","text":"
    • Added in version 1.0.0.
    • Part of the public API version since 2.1.0.
    • Changed return value to const char* and added noexcept in version 3.0.0.
    • Added support for binary type in version 3.8.0.
    "},{"location":"api/basic_json/unflatten/","title":"nlohmann::basic_json::unflatten","text":"
    basic_json unflatten() const;\n

    The function restores the arbitrary nesting of a JSON value that has been flattened before using the flatten() function. The JSON value must meet certain constraints:

    1. The value must be an object.
    2. The keys must be JSON pointers (see RFC 6901)
    3. The mapped values must be primitive JSON types.
    "},{"location":"api/basic_json/unflatten/#return-value","title":"Return value","text":"

    the original JSON from a flattened version

    "},{"location":"api/basic_json/unflatten/#exception-safety","title":"Exception safety","text":"

    Strong exception safety: if an exception occurs, the original value stays intact.

    "},{"location":"api/basic_json/unflatten/#exceptions","title":"Exceptions","text":"

    The function can throw the following exceptions:

    • Throws type_error.314 if value is not an object
    • Throws type_error.315 if object values are not primitive
    "},{"location":"api/basic_json/unflatten/#complexity","title":"Complexity","text":"

    Linear in the size of the JSON value.

    "},{"location":"api/basic_json/unflatten/#notes","title":"Notes","text":"

    Empty objects and arrays are flattened by flatten() to null values and cannot unflattened to their original type. Apart from this example, for a JSON value j, the following is always true: j == j.flatten().unflatten().

    "},{"location":"api/basic_json/unflatten/#examples","title":"Examples","text":"Example

    The following code shows how a flattened JSON object is unflattened into the original nested JSON object.

    #include <iostream>\n#include <iomanip>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // create JSON value\n    json j_flattened =\n    {\n        {\"/answer/everything\", 42},\n        {\"/happy\", true},\n        {\"/list/0\", 1},\n        {\"/list/1\", 0},\n        {\"/list/2\", 2},\n        {\"/name\", \"Niels\"},\n        {\"/nothing\", nullptr},\n        {\"/object/currency\", \"USD\"},\n        {\"/object/value\", 42.99},\n        {\"/pi\", 3.141}\n    };\n\n    // call unflatten()\n    std::cout << std::setw(4) << j_flattened.unflatten() << '\\n';\n}\n

    Output:

    {\n    \"answer\": {\n        \"everything\": 42\n    },\n    \"happy\": true,\n    \"list\": [\n        1,\n        0,\n        2\n    ],\n    \"name\": \"Niels\",\n    \"nothing\": null,\n    \"object\": {\n        \"currency\": \"USD\",\n        \"value\": 42.99\n    },\n    \"pi\": 3.141\n}\n
    "},{"location":"api/basic_json/unflatten/#see-also","title":"See also","text":"
    • flatten the reverse function
    "},{"location":"api/basic_json/unflatten/#version-history","title":"Version history","text":"
    • Added in version 2.0.0.
    "},{"location":"api/basic_json/update/","title":"nlohmann::basic_json::update","text":"
    // (1)\nvoid update(const_reference j, bool merge_objects = false);\n\n// (2)\nvoid update(const_iterator first, const_iterator last, bool merge_objects = false);\n
    1. Inserts all values from JSON object j.
    2. Inserts all values from range [first, last)

    When merge_objects is false (default), existing keys are overwritten. When merge_objects is true, recursively merges objects with common keys.

    The function is motivated by Python's dict.update function.

    "},{"location":"api/basic_json/update/#iterator-invalidation","title":"Iterator invalidation","text":"

    For ordered_json, adding a value to an object can yield a reallocation, in which case all iterators (including the end() iterator) and all references to the elements are invalidated.

    "},{"location":"api/basic_json/update/#parameters","title":"Parameters","text":"j (in) JSON object to read values from merge_objects (in) when true, existing keys are not overwritten, but contents of objects are merged recursively (default: false) first (in) the beginning of the range of elements to insert last (in) the end of the range of elements to insert"},{"location":"api/basic_json/update/#exceptions","title":"Exceptions","text":"
    1. The function can throw the following exceptions:
      • Throws type_error.312 if called on JSON values other than objects; example: \"cannot use update() with string\"
    2. The function can throw the following exceptions:
      • Throws type_error.312 if called on JSON values other than objects; example: \"cannot use update() with string\"
      • Throws invalid_iterator.202 if called on an iterator which does not belong to the current JSON value; example: \"iterator does not fit current value\"
      • Throws invalid_iterator.210 if first and last do not belong to the same JSON value; example: \"iterators do not fit\"
    "},{"location":"api/basic_json/update/#complexity","title":"Complexity","text":"
    1. O(N*log(size() + N)), where N is the number of elements to insert.
    2. O(N*log(size() + N)), where N is the number of elements to insert.
    "},{"location":"api/basic_json/update/#examples","title":"Examples","text":"Example

    The example shows how update() is used.

    #include <iostream>\n#include <iomanip>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\nusing namespace nlohmann::literals;\n\nint main()\n{\n    // create two JSON objects\n    json o1 = R\"( {\"color\": \"red\", \"price\": 17.99, \"names\": {\"de\": \"Flugzeug\"}} )\"_json;\n    json o2 = R\"( {\"color\": \"blue\", \"speed\": 100, \"names\": {\"en\": \"plane\"}} )\"_json;\n    json o3 = o1;\n\n    // add all keys from o2 to o1 (updating \"color\", replacing \"names\")\n    o1.update(o2);\n\n    // add all keys from o2 to o1 (updating \"color\", merging \"names\")\n    o3.update(o2, true);\n\n    // output updated object o1 and o3\n    std::cout << std::setw(2) << o1 << '\\n';\n    std::cout << std::setw(2) << o3 << '\\n';\n}\n

    Output:

    {\n  \"color\": \"blue\",\n  \"names\": {\n    \"en\": \"plane\"\n  },\n  \"price\": 17.99,\n  \"speed\": 100\n}\n{\n  \"color\": \"blue\",\n  \"names\": {\n    \"de\": \"Flugzeug\",\n    \"en\": \"plane\"\n  },\n  \"price\": 17.99,\n  \"speed\": 100\n}\n
    Example

    The example shows how update() is used.

    #include <iostream>\n#include <iomanip>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\nusing namespace nlohmann::literals;\n\nint main()\n{\n    // create two JSON objects\n    json o1 = R\"( {\"color\": \"red\", \"price\": 17.99, \"names\": {\"de\": \"Flugzeug\"}} )\"_json;\n    json o2 = R\"( {\"color\": \"blue\", \"speed\": 100, \"names\": {\"en\": \"plane\"}} )\"_json;\n    json o3 = o1;\n\n    // add all keys from o2 to o1 (updating \"color\", replacing \"names\")\n    o1.update(o2.begin(), o2.end());\n\n    // add all keys from o2 to o1 (updating \"color\", merging \"names\")\n    o3.update(o2.begin(), o2.end(), true);\n\n    // output updated object o1 and o3\n    std::cout << std::setw(2) << o1 << '\\n';\n    std::cout << std::setw(2) << o3 << '\\n';\n}\n

    Output:

    {\n  \"color\": \"blue\",\n  \"names\": {\n    \"en\": \"plane\"\n  },\n  \"price\": 17.99,\n  \"speed\": 100\n}\n{\n  \"color\": \"blue\",\n  \"names\": {\n    \"de\": \"Flugzeug\",\n    \"en\": \"plane\"\n  },\n  \"price\": 17.99,\n  \"speed\": 100\n}\n
    Example

    One common use case for this function is the handling of user settings. Assume your application can be configured in some aspects:

    {\n    \"color\": \"red\",\n    \"active\": true,\n    \"name\": {\"de\": \"Maus\", \"en\": \"mouse\"}\n}\n

    The user may override the default settings selectively:

    {\n    \"color\": \"blue\",\n    \"name\": {\"es\": \"rat\u00f3n\"},\n}\n

    Then update manages the merging of default settings and user settings:

    auto user_settings = json::parse(\"config.json\");\nauto effective_settings = get_default_settings();\neffective_settings.update(user_settings);\n

    Now effective_settings contains the default settings, but those keys set by the user are overwritten:

    {\n    \"color\": \"blue\",\n    \"active\": true,\n    \"name\": {\"es\": \"rat\u00f3n\"}\n}\n

    Note existing keys were just overwritten. To merge objects, merge_objects setting should be set to true:

    auto user_settings = json::parse(\"config.json\");\nauto effective_settings = get_default_settings();\neffective_settings.update(user_settings, true);\n
    {\n    \"color\": \"blue\",\n    \"active\": true,\n    \"name\": {\"de\": \"Maus\", \"en\": \"mouse\", \"es\": \"rat\u00f3n\"}\n}\n
    "},{"location":"api/basic_json/update/#version-history","title":"Version history","text":"
    • Added in version 3.0.0.
    • Added merge_objects parameter in 3.10.5.
    "},{"location":"api/basic_json/value/","title":"nlohmann::basic_json::value","text":"
    // (1)\ntemplate<class ValueType>\nValueType value(const typename object_t::key_type& key,\n                ValueType&& default_value) const;\n\n// (2)\ntemplate<class ValueType, class KeyType>\nValueType value(KeyType&& key,\n                ValueType&& default_value) const;\n\n// (3)\ntemplate<class ValueType>\nValueType value(const json_pointer& ptr,\n                const ValueType& default_value) const;\n

    1. Returns either a copy of an object's element at the specified key key or a given default value if no element with key key exists.

      The function is basically equivalent to executing 

      try {\n   return at(key);\n} catch(out_of_range) {\n   return default_value;\n}\n

    2. See 1. This overload is only available if KeyType is comparable with typename object_t::key_type and typename object_comparator_t::is_transparent denotes a type.

    3. Returns either a copy of an object's element at the specified JSON pointer ptr or a given default value if no value at ptr exists.

      The function is basically equivalent to executing 

      try {\n   return at(ptr);\n} catch(out_of_range) {\n   return default_value;\n}\n

    Differences to at and operator[]

    • Unlike at, this function does not throw if the given key/ptr was not found.
    • Unlike operator[], this function does not implicitly add an element to the position defined by key/ptr key. This function is furthermore also applicable to const objects.
    "},{"location":"api/basic_json/value/#template-parameters","title":"Template parameters","text":"KeyType A type for an object key other than json_pointer that is comparable with string_t using object_comparator_t. This can also be a string view (C++17). ValueType type compatible to JSON values, for instance int for JSON integer numbers, bool for JSON booleans, or std::vector types for JSON arrays. Note the type of the expected value at key/ptr and the default value default_value must be compatible."},{"location":"api/basic_json/value/#parameters","title":"Parameters","text":"key (in) key of the element to access default_value (in) the value to return if key/ptr found no value ptr (in) a JSON pointer to the element to access"},{"location":"api/basic_json/value/#return-value","title":"Return value","text":"
    1. copy of the element at key key or default_value if key is not found
    2. copy of the element at key key or default_value if key is not found
    3. copy of the element at JSON Pointer ptr or default_value if no value for ptr is found
    "},{"location":"api/basic_json/value/#exception-safety","title":"Exception safety","text":"

    Strong guarantee: if an exception is thrown, there are no changes to any JSON value.

    "},{"location":"api/basic_json/value/#exceptions","title":"Exceptions","text":"
    1. The function can throw the following exceptions:
      • Throws type_error.302 if default_value does not match the type of the value at key
      • Throws type_error.306 if the JSON value is not an object; in that case, using value() with a key makes no sense.
    2. See 1.
    3. The function can throw the following exceptions:
      • Throws type_error.302 if default_value does not match the type of the value at ptr
      • Throws type_error.306 if the JSON value is not an object; in that case, using value() with a key makes no sense.
    "},{"location":"api/basic_json/value/#complexity","title":"Complexity","text":"
    1. Logarithmic in the size of the container.
    2. Logarithmic in the size of the container.
    3. Logarithmic in the size of the container.
    "},{"location":"api/basic_json/value/#notes","title":"Notes","text":"

    Return type

    The value function is a template, and the return type of the function is determined by the type of the provided default value unless otherwise specified. This can have unexpected effects. In the example below, we store a 64-bit unsigned integer. We get exactly that value when using operator[]. However, when we call value and provide 0 as default value, then -1 is returned. The occurs, because 0 has type int which overflows when handling the value 18446744073709551615.

    To address this issue, either provide a correctly typed default value or use the template parameter to specify the desired return type. Note that this issue occurs even when a value is stored at the provided key, and the default value is not used as the return value.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    json j = json::parse(R\"({\"uint64\": 18446744073709551615})\");\n\n    std::cout << \"operator[]:                \" << j[\"uint64\"] << '\\n'\n              << \"default value (int):       \" << j.value(\"uint64\", 0) << '\\n'\n              << \"default value (uint64_t):  \" << j.value(\"uint64\", std::uint64_t(0)) << '\\n'\n              << \"explict return value type: \" << j.value<std::uint64_t>(\"uint64\", 0) << '\\n';\n}\n

    Output:

    operator[]:                18446744073709551615\ndefault value (int):       -1\ndefault value (uint64_t):  18446744073709551615\nexplict return value type: 18446744073709551615\n
    "},{"location":"api/basic_json/value/#examples","title":"Examples","text":"Example: (1) access specified object element with default value

    The example below shows how object elements can be queried with a default value.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // create a JSON object with different entry types\n    json j =\n    {\n        {\"integer\", 1},\n        {\"floating\", 42.23},\n        {\"string\", \"hello world\"},\n        {\"boolean\", true},\n        {\"object\", {{\"key1\", 1}, {\"key2\", 2}}},\n        {\"array\", {1, 2, 3}}\n    };\n\n    // access existing values\n    int v_integer = j.value(\"integer\", 0);\n    double v_floating = j.value(\"floating\", 47.11);\n\n    // access nonexisting values and rely on default value\n    std::string v_string = j.value(\"nonexisting\", \"oops\");\n    bool v_boolean = j.value(\"nonexisting\", false);\n\n    // output values\n    std::cout << std::boolalpha << v_integer << \" \" << v_floating\n              << \" \" << v_string << \" \" << v_boolean << \"\\n\";\n}\n

    Output:

    1 42.23 oops false\n
    Example: (2) access specified object element using string_view with default value

    The example below shows how object elements can be queried with a default value.

    #include <iostream>\n#include <string_view>\n#include <nlohmann/json.hpp>\n\nusing namespace std::string_view_literals;\nusing json = nlohmann::json;\n\nint main()\n{\n    // create a JSON object with different entry types\n    json j =\n    {\n        {\"integer\", 1},\n        {\"floating\", 42.23},\n        {\"string\", \"hello world\"},\n        {\"boolean\", true},\n        {\"object\", {{\"key1\", 1}, {\"key2\", 2}}},\n        {\"array\", {1, 2, 3}}\n    };\n\n    // access existing values\n    int v_integer = j.value(\"integer\"sv, 0);\n    double v_floating = j.value(\"floating\"sv, 47.11);\n\n    // access nonexisting values and rely on default value\n    std::string v_string = j.value(\"nonexisting\"sv, \"oops\");\n    bool v_boolean = j.value(\"nonexisting\"sv, false);\n\n    // output values\n    std::cout << std::boolalpha << v_integer << \" \" << v_floating\n              << \" \" << v_string << \" \" << v_boolean << \"\\n\";\n}\n

    Output:

    1 42.23 oops false\n
    Example: (3) access specified object element via JSON Pointer with default value

    The example below shows how object elements can be queried with a default value.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\nusing namespace nlohmann::literals;\n\nint main()\n{\n    // create a JSON object with different entry types\n    json j =\n    {\n        {\"integer\", 1},\n        {\"floating\", 42.23},\n        {\"string\", \"hello world\"},\n        {\"boolean\", true},\n        {\"object\", {{\"key1\", 1}, {\"key2\", 2}}},\n        {\"array\", {1, 2, 3}}\n    };\n\n    // access existing values\n    int v_integer = j.value(\"/integer\"_json_pointer, 0);\n    double v_floating = j.value(\"/floating\"_json_pointer, 47.11);\n\n    // access nonexisting values and rely on default value\n    std::string v_string = j.value(\"/nonexisting\"_json_pointer, \"oops\");\n    bool v_boolean = j.value(\"/nonexisting\"_json_pointer, false);\n\n    // output values\n    std::cout << std::boolalpha << v_integer << \" \" << v_floating\n              << \" \" << v_string << \" \" << v_boolean << \"\\n\";\n}\n

    Output:

    1 42.23 oops false\n
    "},{"location":"api/basic_json/value/#see-also","title":"See also","text":"
    • see at for access by reference with range checking
    • see operator[] for unchecked access by reference
    "},{"location":"api/basic_json/value/#version-history","title":"Version history","text":"
    1. Added in version 1.0.0. Changed parameter default_value type from const ValueType& to ValueType&& in version 3.11.0.
    2. Added in version 3.11.0. Made ValueType the first template parameter in version 3.11.2.
    3. Added in version 2.0.2.
    "},{"location":"api/basic_json/value_t/","title":"nlohmann::basic_json::value_t","text":"
    enum class value_t : std::uint8_t {\n    null,\n    object,\n    array,\n    string,\n    boolean,\n    number_integer,\n    number_unsigned,\n    number_float,\n    binary,\n    discarded\n};\n

    This enumeration collects the different JSON types. It is internally used to distinguish the stored values, and the functions is_null, is_object, is_array, is_string, is_boolean, is_number (with is_number_integer, is_number_unsigned, and is_number_float), is_discarded, is_binary, is_primitive, and is_structured rely on it.

    "},{"location":"api/basic_json/value_t/#notes","title":"Notes","text":"

    Ordering

    The order of types is as follows:

    1. null
    2. boolean
    3. number_integer, number_unsigned, number_float
    4. object
    5. array
    6. string
    7. binary

    discarded is unordered.

    Types of numbers

    There are three enumerators for numbers (number_integer, number_unsigned, and number_float) to distinguish between different types of numbers:

    • number_unsigned_t for unsigned integers
    • number_integer_t for signed integers
    • number_float_t for floating-point numbers or to approximate integers which do not fit into the limits of their respective type

    Comparison operators

    operator< and operator<=> (since C++20) are overloaded and compare according to the ordering described above. Until C++20 all other relational and equality operators yield results according to the integer value of each enumerator. Since C++20 some compilers consider the rewritten candidates generated from operator<=> during overload resolution, while others do not. For predictable and portable behavior use:

    • operator< or operator<=> when wanting to compare according to the order described above
    • operator== or operator!= when wanting to compare according to each enumerators integer value
    "},{"location":"api/basic_json/value_t/#examples","title":"Examples","text":"Example

    The following code how type() queries the value_t for all JSON types.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // create JSON values\n    json j_null;\n    json j_boolean = true;\n    json j_number_integer = -17;\n    json j_number_unsigned = 42u;\n    json j_number_float = 23.42;\n    json j_object = {{\"one\", 1}, {\"two\", 2}};\n    json j_array = {1, 2, 4, 8, 16};\n    json j_string = \"Hello, world\";\n\n    // call type()\n    std::cout << std::boolalpha;\n    std::cout << (j_null.type() == json::value_t::null) << '\\n';\n    std::cout << (j_boolean.type() == json::value_t::boolean) << '\\n';\n    std::cout << (j_number_integer.type() == json::value_t::number_integer) << '\\n';\n    std::cout << (j_number_unsigned.type() == json::value_t::number_unsigned) << '\\n';\n    std::cout << (j_number_float.type() == json::value_t::number_float) << '\\n';\n    std::cout << (j_object.type() == json::value_t::object) << '\\n';\n    std::cout << (j_array.type() == json::value_t::array) << '\\n';\n    std::cout << (j_string.type() == json::value_t::string) << '\\n';\n}\n

    Output:

    true\ntrue\ntrue\ntrue\ntrue\ntrue\ntrue\ntrue\n
    "},{"location":"api/basic_json/value_t/#version-history","title":"Version history","text":"
    • Added in version 1.0.0.
    • Added unsigned integer type in version 2.0.0.
    • Added binary type in version 3.8.0.
    "},{"location":"api/basic_json/~basic_json/","title":"nlohmann::basic_json::~basic_json","text":"
    ~basic_json() noexcept;\n

    Destroys the JSON value and frees all allocated memory.

    "},{"location":"api/basic_json/~basic_json/#exception-safety","title":"Exception safety","text":"

    No-throw guarantee: this member function never throws exceptions.

    "},{"location":"api/basic_json/~basic_json/#complexity","title":"Complexity","text":"

    Linear.

    "},{"location":"api/basic_json/~basic_json/#version-history","title":"Version history","text":"
    • Added in version 1.0.0.
    "},{"location":"api/byte_container_with_subtype/","title":"nlohmann::byte_container_with_subtype","text":"
    template<typename BinaryType>\nclass byte_container_with_subtype : public BinaryType;\n

    This type extends the template parameter BinaryType provided to basic_json with a subtype used by BSON and MessagePack. This type exists so that the user does not have to specify a type themselves with a specific naming scheme in order to override the binary type.

    "},{"location":"api/byte_container_with_subtype/#template-parameters","title":"Template parameters","text":"BinaryType container to store bytes (std::vector<std::uint8_t> by default)"},{"location":"api/byte_container_with_subtype/#member-types","title":"Member types","text":"
    • container_type - the type of the underlying container (BinaryType)
    • subtype_type - the type of the subtype (std::uint64_t)
    "},{"location":"api/byte_container_with_subtype/#member-functions","title":"Member functions","text":"
    • (constructor)
    • operator== - comparison: equal
    • operator!= - comparison: not equal
    • set_subtype - sets the binary subtype
    • subtype - return the binary subtype
    • has_subtype - return whether the value has a subtype
    • clear_subtype - clears the binary subtype
    "},{"location":"api/byte_container_with_subtype/#version-history","title":"Version history","text":"
    • Added in version 3.8.0.
    • Changed the type of subtypes to std::uint64_t in 3.10.0.
    "},{"location":"api/byte_container_with_subtype/byte_container_with_subtype/","title":"nlohmann::byte_container_with_subtype::byte_container_with_subtype","text":"
    // (1)\nbyte_container_with_subtype();\n\n// (2)\nbyte_container_with_subtype(const container_type& container);\nbyte_container_with_subtype(container_type&& container);\n\n// (3)\nbyte_container_with_subtype(const container_type& container, subtype_type subtype);\nbyte_container_with_subtype(container_type&& container, subtype_type subtype);\n
    1. Create an empty binary container without a subtype.
    2. Create a binary container without a subtype.
    3. Create a binary container with a subtype.
    "},{"location":"api/byte_container_with_subtype/byte_container_with_subtype/#parameters","title":"Parameters","text":"container (in) binary container subtype (in) subtype"},{"location":"api/byte_container_with_subtype/byte_container_with_subtype/#examples","title":"Examples","text":"Example

    The example below demonstrates how byte containers can be created.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\n// define a byte container based on std::vector\nusing byte_container_with_subtype = nlohmann::byte_container_with_subtype<std::vector<std::uint8_t>>;\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // (1) create empty container\n    auto c1 = byte_container_with_subtype();\n\n    std::vector<std::uint8_t> bytes = {{0xca, 0xfe, 0xba, 0xbe}};\n\n    // (2) create container\n    auto c2 = byte_container_with_subtype(bytes);\n\n    // (3) create container with subtype\n    auto c3 = byte_container_with_subtype(bytes, 42);\n\n    std::cout << json(c1) << \"\\n\" << json(c2) << \"\\n\" << json(c3) << std::endl;\n}\n

    Output:

    {\"bytes\":[],\"subtype\":null}\n{\"bytes\":[202,254,186,190],\"subtype\":null}\n{\"bytes\":[202,254,186,190],\"subtype\":42}\n
    "},{"location":"api/byte_container_with_subtype/byte_container_with_subtype/#version-history","title":"Version history","text":"

    Since version 3.8.0.

    "},{"location":"api/byte_container_with_subtype/clear_subtype/","title":"nlohmann::byte_container_with_subtype::clear_subtype","text":"
    void clear_subtype() noexcept;\n

    Clears the binary subtype and flags the value as not having a subtype, which has implications for serialization; for instance, MessagePack will prefer the bin family over the ext family.

    "},{"location":"api/byte_container_with_subtype/clear_subtype/#exception-safety","title":"Exception safety","text":"

    No-throw guarantee: this function never throws exceptions.

    "},{"location":"api/byte_container_with_subtype/clear_subtype/#complexity","title":"Complexity","text":"

    Constant.

    "},{"location":"api/byte_container_with_subtype/clear_subtype/#examples","title":"Examples","text":"Example

    The example below demonstrates how clear_subtype can remove subtypes.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\n// define a byte container based on std::vector\nusing byte_container_with_subtype = nlohmann::byte_container_with_subtype<std::vector<std::uint8_t>>;\n\nusing json = nlohmann::json;\n\nint main()\n{\n    std::vector<std::uint8_t> bytes = {{0xca, 0xfe, 0xba, 0xbe}};\n\n    // create container with subtype\n    auto c1 = byte_container_with_subtype(bytes, 42);\n\n    std::cout << \"before calling clear_subtype(): \" << json(c1) << '\\n';\n\n    c1.clear_subtype();\n\n    std::cout << \"after calling clear_subtype(): \" << json(c1) << '\\n';\n}\n

    Output:

    before calling clear_subtype(): {\"bytes\":[202,254,186,190],\"subtype\":42}\nafter calling clear_subtype(): {\"bytes\":[202,254,186,190],\"subtype\":null}\n
    "},{"location":"api/byte_container_with_subtype/clear_subtype/#version-history","title":"Version history","text":"

    Since version 3.8.0.

    "},{"location":"api/byte_container_with_subtype/has_subtype/","title":"nlohmann::byte_container_with_subtype::has_subtype","text":"
    constexpr bool has_subtype() const noexcept;\n

    Returns whether the value has a subtype.

    "},{"location":"api/byte_container_with_subtype/has_subtype/#return-value","title":"Return value","text":"

    whether the value has a subtype

    "},{"location":"api/byte_container_with_subtype/has_subtype/#exception-safety","title":"Exception safety","text":"

    No-throw guarantee: this function never throws exceptions.

    "},{"location":"api/byte_container_with_subtype/has_subtype/#complexity","title":"Complexity","text":"

    Constant.

    "},{"location":"api/byte_container_with_subtype/has_subtype/#examples","title":"Examples","text":"Example

    The example below demonstrates how has_subtype can check whether a subtype was set.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\n// define a byte container based on std::vector\nusing byte_container_with_subtype = nlohmann::byte_container_with_subtype<std::vector<std::uint8_t>>;\n\nint main()\n{\n    std::vector<std::uint8_t> bytes = {{0xca, 0xfe, 0xba, 0xbe}};\n\n    // create container\n    auto c1 = byte_container_with_subtype(bytes);\n\n    // create container with subtype\n    auto c2 = byte_container_with_subtype(bytes, 42);\n\n    std::cout << std::boolalpha << \"c1.has_subtype() = \" << c1.has_subtype()\n              << \"\\nc2.has_subtype() = \" << c2.has_subtype() << std::endl;\n}\n

    Output:

    c1.has_subtype() = false\nc2.has_subtype() = true\n
    "},{"location":"api/byte_container_with_subtype/has_subtype/#version-history","title":"Version history","text":"

    Since version 3.8.0.

    "},{"location":"api/byte_container_with_subtype/set_subtype/","title":"nlohmann::byte_container_with_subtype::set_subtype","text":"
    void set_subtype(subtype_type subtype) noexcept;\n

    Sets the binary subtype of the value, also flags a binary JSON value as having a subtype, which has implications for serialization.

    "},{"location":"api/byte_container_with_subtype/set_subtype/#parameters","title":"Parameters","text":"subtype (in) subtype to set"},{"location":"api/byte_container_with_subtype/set_subtype/#exception-safety","title":"Exception safety","text":"

    No-throw guarantee: this function never throws exceptions.

    "},{"location":"api/byte_container_with_subtype/set_subtype/#complexity","title":"Complexity","text":"

    Constant.

    "},{"location":"api/byte_container_with_subtype/set_subtype/#examples","title":"Examples","text":"Example

    The example below demonstrates how a subtype can be set with set_subtype.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\n// define a byte container based on std::vector\nusing byte_container_with_subtype = nlohmann::byte_container_with_subtype<std::vector<std::uint8_t>>;\n\nusing json = nlohmann::json;\n\nint main()\n{\n    std::vector<std::uint8_t> bytes = {{0xca, 0xfe, 0xba, 0xbe}};\n\n    // create container without subtype\n    auto c = byte_container_with_subtype(bytes);\n\n    std::cout << \"before calling set_subtype(42): \" << json(c) << '\\n';\n\n    // set the subtype\n    c.set_subtype(42);\n\n    std::cout << \"after calling set_subtype(42): \" << json(c) << '\\n';\n}\n

    Output:

    before calling set_subtype(42): {\"bytes\":[202,254,186,190],\"subtype\":null}\nafter calling set_subtype(42): {\"bytes\":[202,254,186,190],\"subtype\":42}\n
    "},{"location":"api/byte_container_with_subtype/set_subtype/#version-history","title":"Version history","text":"

    Since version 3.8.0.

    "},{"location":"api/byte_container_with_subtype/subtype/","title":"nlohmann::byte_container_with_subtype::subtype","text":"
    constexpr subtype_type subtype() const noexcept;\n

    Returns the numerical subtype of the value if it has a subtype. If it does not have a subtype, this function will return subtype_type(-1) as a sentinel value.

    "},{"location":"api/byte_container_with_subtype/subtype/#return-value","title":"Return value","text":"

    the numerical subtype of the binary value, or subtype_type(-1) if no subtype is set

    "},{"location":"api/byte_container_with_subtype/subtype/#exception-safety","title":"Exception safety","text":"

    No-throw guarantee: this function never throws exceptions.

    "},{"location":"api/byte_container_with_subtype/subtype/#complexity","title":"Complexity","text":"

    Constant.

    "},{"location":"api/byte_container_with_subtype/subtype/#examples","title":"Examples","text":"Example

    The example below demonstrates how the subtype can be retrieved with subtype. Note how subtype_type(-1) is returned for container c1.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\n// define a byte container based on std::vector\nusing byte_container_with_subtype = nlohmann::byte_container_with_subtype<std::vector<std::uint8_t>>;\n\nint main()\n{\n    std::vector<std::uint8_t> bytes = {{0xca, 0xfe, 0xba, 0xbe}};\n\n    // create container\n    auto c1 = byte_container_with_subtype(bytes);\n\n    // create container with subtype\n    auto c2 = byte_container_with_subtype(bytes, 42);\n\n    std::cout << \"c1.subtype() = \" << c1.subtype()\n              << \"\\nc2.subtype() = \" << c2.subtype() << std::endl;\n\n    // in case no subtype is set, return special value\n    assert(c1.subtype() == static_cast<byte_container_with_subtype::subtype_type>(-1));\n}\n

    Output:

    c1.subtype() = 18446744073709551615\nc2.subtype() = 42\n
    "},{"location":"api/byte_container_with_subtype/subtype/#version-history","title":"Version history","text":"
    • Added in version 3.8.0
    • Fixed return value to properly return subtype_type(-1) as documented in version 3.10.0.
    "},{"location":"api/json_pointer/","title":"nlohmann::json_pointer","text":"
    template<typename RefStringType>\nclass json_pointer;\n

    A JSON pointer defines a string syntax for identifying a specific value within a JSON document. It can be used with functions at and operator[]. Furthermore, JSON pointers are the base for JSON patches.

    "},{"location":"api/json_pointer/#template-parameters","title":"Template parameters","text":"RefStringType the string type used for the reference tokens making up the JSON pointer

    Deprecation

    For backwards compatibility RefStringType may also be a specialization of basic_json in which case string_t will be deduced as basic_json::string_t. This feature is deprecated and may be removed in a future major version.

    "},{"location":"api/json_pointer/#member-types","title":"Member types","text":"
    • string_t - the string type used for the reference tokens
    "},{"location":"api/json_pointer/#member-functions","title":"Member functions","text":"
    • (constructor)
    • to_string - return a string representation of the JSON pointer
    • operator string_t - return a string representation of the JSON pointer
    • operator== - compare: equal
    • operator!= - compare: not equal
    • operator/= - append to the end of the JSON pointer
    • operator/ - create JSON Pointer by appending
    • parent_pointer - returns the parent of this JSON pointer
    • pop_back - remove the last reference token
    • back - return last reference token
    • push_back - append an unescaped token at the end of the pointer
    • empty - return whether the pointer points to the root document
    "},{"location":"api/json_pointer/#literals","title":"Literals","text":"
    • operator\"\"_json_pointer - user-defined string literal for JSON pointers
    "},{"location":"api/json_pointer/#see-also","title":"See also","text":"
    • RFC 6901
    "},{"location":"api/json_pointer/#version-history","title":"Version history","text":"
    • Added in version 2.0.0.
    • Changed template parameter from basic_json to string type in version 3.11.0.
    "},{"location":"api/json_pointer/back/","title":"nlohmann::json_pointer::back","text":"
    const string_t& back() const;\n

    Return the last reference token.

    "},{"location":"api/json_pointer/back/#return-value","title":"Return value","text":"

    Last reference token.

    "},{"location":"api/json_pointer/back/#exceptions","title":"Exceptions","text":"

    Throws out_of_range.405 if the JSON pointer has no parent.

    "},{"location":"api/json_pointer/back/#complexity","title":"Complexity","text":"

    Constant.

    "},{"location":"api/json_pointer/back/#examples","title":"Examples","text":"Example

    The example shows the usage of back.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // different JSON Pointers\n    json::json_pointer ptr1(\"/foo\");\n    json::json_pointer ptr2(\"/foo/0\");\n\n    // call empty()\n    std::cout << \"last reference token of \\\"\" << ptr1 << \"\\\" is \\\"\" << ptr1.back() << \"\\\"\\n\"\n              << \"last reference token of \\\"\" << ptr2 << \"\\\" is \\\"\" << ptr2.back() << \"\\\"\" << std::endl;\n}\n

    Output:

    last reference token of \"/foo\" is \"foo\"\nlast reference token of \"/foo/0\" is \"0\"\n
    "},{"location":"api/json_pointer/back/#version-history","title":"Version history","text":"
    • Added in version 3.6.0.
    • Changed return type to string_t in version 3.11.0.
    "},{"location":"api/json_pointer/empty/","title":"nlohmann::json_pointer::empty","text":"
    bool empty() const noexcept;\n

    Return whether the pointer points to the root document.

    "},{"location":"api/json_pointer/empty/#return-value","title":"Return value","text":"

    true iff the JSON pointer points to the root document.

    "},{"location":"api/json_pointer/empty/#exception-safety","title":"Exception safety","text":"

    No-throw guarantee: this function never throws exceptions.

    "},{"location":"api/json_pointer/empty/#complexity","title":"Complexity","text":"

    Constant.

    "},{"location":"api/json_pointer/empty/#examples","title":"Examples","text":"Example

    The example shows the result of empty for different JSON Pointers.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // different JSON Pointers\n    json::json_pointer ptr0;\n    json::json_pointer ptr1(\"\");\n    json::json_pointer ptr2(\"/foo\");\n    json::json_pointer ptr3(\"/foo/0\");\n\n    // call empty()\n    std::cout << std::boolalpha\n              << \"\\\"\" << ptr0 << \"\\\": \" << ptr0.empty() << '\\n'\n              << \"\\\"\" << ptr1 << \"\\\": \" << ptr1.empty() << '\\n'\n              << \"\\\"\" << ptr2 << \"\\\": \" << ptr2.empty() << '\\n'\n              << \"\\\"\" << ptr3 << \"\\\": \" << ptr3.empty() << std::endl;\n}\n

    Output:

    \"\": true\n\"\": true\n\"/foo\": false\n\"/foo/0\": false\n
    "},{"location":"api/json_pointer/empty/#version-history","title":"Version history","text":"

    Added in version 3.6.0.

    "},{"location":"api/json_pointer/json_pointer/","title":"nlohmann::json_pointer::json_pointer","text":"
    explicit json_pointer(const string_t& s = \"\");\n

    Create a JSON pointer according to the syntax described in Section 3 of RFC6901.

    "},{"location":"api/json_pointer/json_pointer/#parameters","title":"Parameters","text":"s (in) string representing the JSON pointer; if omitted, the empty string is assumed which references the whole JSON value"},{"location":"api/json_pointer/json_pointer/#exceptions","title":"Exceptions","text":"
    • Throws parse_error.107 if the given JSON pointer s is nonempty and does not begin with a slash (/); see example below.
    • Throws parse_error.108 if a tilde (~) in the given JSON pointer s is not followed by 0 (representing ~) or 1 (representing /); see example below.
    "},{"location":"api/json_pointer/json_pointer/#examples","title":"Examples","text":"Example

    The example shows the construction several valid JSON pointers as well as the exceptional behavior.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // correct JSON pointers\n    json::json_pointer p1;\n    json::json_pointer p2(\"\");\n    json::json_pointer p3(\"/\");\n    json::json_pointer p4(\"//\");\n    json::json_pointer p5(\"/foo/bar\");\n    json::json_pointer p6(\"/foo/bar/-\");\n    json::json_pointer p7(\"/foo/~0\");\n    json::json_pointer p8(\"/foo/~1\");\n\n    // error: JSON pointer does not begin with a slash\n    try\n    {\n        json::json_pointer p9(\"foo\");\n    }\n    catch (const json::parse_error& e)\n    {\n        std::cout << e.what() << '\\n';\n    }\n\n    // error: JSON pointer uses escape symbol ~ not followed by 0 or 1\n    try\n    {\n        json::json_pointer p10(\"/foo/~\");\n    }\n    catch (const json::parse_error& e)\n    {\n        std::cout << e.what() << '\\n';\n    }\n\n    // error: JSON pointer uses escape symbol ~ not followed by 0 or 1\n    try\n    {\n        json::json_pointer p11(\"/foo/~3\");\n    }\n    catch (const json::parse_error& e)\n    {\n        std::cout << e.what() << '\\n';\n    }\n}\n

    Output:

    [json.exception.parse_error.107] parse error at byte 1: JSON pointer must be empty or begin with '/' - was: 'foo'\n[json.exception.parse_error.108] parse error: escape character '~' must be followed with '0' or '1'\n[json.exception.parse_error.108] parse error: escape character '~' must be followed with '0' or '1'\n
    "},{"location":"api/json_pointer/json_pointer/#version-history","title":"Version history","text":"
    • Added in version 2.0.0.
    • Changed type of s to string_t in version 3.11.0.
    "},{"location":"api/json_pointer/operator_eq/","title":"nlohmann::json_pointer::operator==","text":"
    // until C++20\ntemplate<typename RefStringTypeLhs, typename RefStringTypeRhs>\nbool operator==(\n    const json_pointer<RefStringTypeLhs>& lhs,\n    const json_pointer<RefStringTypeRhs>& rhs) noexcept;            // (1)\n\ntemplate<typename RefStringTypeLhs, typename StringType>\nbool operator==(\n    const json_pointer<RefStringTypeLhs>& lhs,\n    const StringType& rhs);                                         // (2)\n\ntemplate<typename RefStringTypeRhs, typename StringType>\nbool operator==(\n    const StringType& lhs,\n    const json_pointer<RefStringTypeRhs>& rhs);                     // (2)\n\n// since C++20\nclass json_pointer {\n    template<typename RefStringTypeRhs>\n    bool operator==(\n        const json_pointer<RefStringTypeRhs>& rhs) const noexcept;  // (1)\n\n    bool operator==(const string_t& rhs) const;                     // (2)\n};\n

    1. Compares two JSON pointers for equality by comparing their reference tokens.

    2. Compares a JSON pointer and a string or a string and a JSON pointer for equality by converting the string to a JSON pointer and comparing the JSON pointers according to 1.

    "},{"location":"api/json_pointer/operator_eq/#template-parameters","title":"Template parameters","text":"RefStringTypeLhs, RefStringTypeRhs the string type of the left-hand side or right-hand side JSON pointer, respectively StringType the string type derived from the json_pointer operand (json_pointer::string_t)"},{"location":"api/json_pointer/operator_eq/#parameters","title":"Parameters","text":"lhs (in) first value to consider rhs (in) second value to consider"},{"location":"api/json_pointer/operator_eq/#return-value","title":"Return value","text":"

    whether the values lhs/*this and rhs are equal

    "},{"location":"api/json_pointer/operator_eq/#exception-safety","title":"Exception safety","text":"
    1. No-throw guarantee: this function never throws exceptions.
    2. Strong exception safety: if an exception occurs, the original value stays intact.
    "},{"location":"api/json_pointer/operator_eq/#exceptions","title":"Exceptions","text":"
    1. (none)
    2. The function can throw the following exceptions:
    3. Throws parse_error.107 if the given JSON pointer s is nonempty and does not begin with a slash (/); see example below.
    4. Throws parse_error.108 if a tilde (~) in the given JSON pointer s is not followed by 0 (representing ~) or 1 (representing /); see example below.
    "},{"location":"api/json_pointer/operator_eq/#complexity","title":"Complexity","text":"

    Constant if lhs and rhs differ in the number of reference tokens, otherwise linear in the number of reference tokens.

    "},{"location":"api/json_pointer/operator_eq/#notes","title":"Notes","text":"

    Deprecation

    Overload 2 is deprecated and will be removed in a future major version release.

    "},{"location":"api/json_pointer/operator_eq/#examples","title":"Examples","text":"Example: (1) Comparing JSON pointers

    The example demonstrates comparing JSON pointers.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // different JSON pointers\n    json::json_pointer ptr0;\n    json::json_pointer ptr1(\"\");\n    json::json_pointer ptr2(\"/foo\");\n\n    // compare JSON pointers\n    std::cout << std::boolalpha\n              << \"\\\"\" << ptr0 << \"\\\" == \\\"\" << ptr0 << \"\\\": \" << (ptr0 == ptr0) << '\\n'\n              << \"\\\"\" << ptr0 << \"\\\" == \\\"\" << ptr1 << \"\\\": \" << (ptr0 == ptr1) << '\\n'\n              << \"\\\"\" << ptr1 << \"\\\" == \\\"\" << ptr2 << \"\\\": \" << (ptr1 == ptr2) << '\\n'\n              << \"\\\"\" << ptr2 << \"\\\" == \\\"\" << ptr2 << \"\\\": \" << (ptr2 == ptr2) << std::endl;\n}\n

    Output:

    \"\" == \"\": true\n\"\" == \"\": true\n\"\" == \"/foo\": false\n\"/foo\" == \"/foo\": true\n
    Example: (2) Comparing JSON pointers and strings

    The example demonstrates comparing JSON pointers and strings, and when doing so may raise an exception.

    #include <exception>\n#include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // different JSON pointers\n    json::json_pointer ptr0;\n    json::json_pointer ptr1(\"\");\n    json::json_pointer ptr2(\"/foo\");\n\n    // different strings\n    std::string str0(\"\");\n    std::string str1(\"/foo\");\n    std::string str2(\"bar\");\n\n    // compare JSON pointers and strings\n    std::cout << std::boolalpha\n              << \"\\\"\" << ptr0 << \"\\\" == \\\"\" << str0 << \"\\\": \" << (ptr0 == str0) << '\\n'\n              << \"\\\"\" << str0 << \"\\\" == \\\"\" << ptr1 << \"\\\": \" << (str0 == ptr1) << '\\n'\n              << \"\\\"\" << ptr2 << \"\\\" == \\\"\" << str1 << \"\\\": \" << (ptr2 == str1) << std::endl;\n\n    try\n    {\n        std::cout << \"\\\"\" << str2 << \"\\\" == \\\"\" << ptr2 << \"\\\": \" << (str2 == ptr2) << std::endl;\n    }\n    catch (const json::parse_error& ex)\n    {\n        std::cout << ex.what() << std::endl;\n    }\n}\n

    Output:

    \"\" == \"\": true\n\"\" == \"\": true\n\"/foo\" == \"/foo\": true\n\"bar\" == \"/foo\": [json.exception.parse_error.107] parse error at byte 1: JSON pointer must be empty or begin with '/' - was: 'bar'\n
    "},{"location":"api/json_pointer/operator_eq/#version-history","title":"Version history","text":"
    1. Added in version 2.1.0. Added C++20 member functions in version 3.11.2.
    2. Added for backward compatibility and deprecated in version 3.11.2.
    "},{"location":"api/json_pointer/operator_ne/","title":"nlohmann::json_pointer::operator!=","text":"
    // until C++20\ntemplate<typename RefStringTypeLhs, typename RefStringTypeRhs>\nbool operator!=(\n    const json_pointer<RefStringTypeLhs>& lhs,\n    const json_pointer<RefStringTypeRhs>& rhs) noexcept;  // (1)\n\ntemplate<typename RefStringTypeLhs, typename StringType>\nbool operator!=(\n    const json_pointer<RefStringTypeLhs>& lhs,\n    const StringType& rhs);                               // (2)\n\ntemplate<typename RefStringTypeRhs, typename StringType>\nbool operator!=(\n    const StringType& lhs,\n    const json_pointer<RefStringTypeRhs>& rhs);           // (2)\n

    1. Compares two JSON pointers for inequality by comparing their reference tokens.

    2. Compares a JSON pointer and a string or a string and a JSON pointer for inequality by converting the string to a JSON pointer and comparing the JSON pointers according to 1.

    "},{"location":"api/json_pointer/operator_ne/#template-parameters","title":"Template parameters","text":"RefStringTypeLhs, RefStringTypeRhs the string type of the left-hand side or right-hand side JSON pointer, respectively StringType the string type derived from the json_pointer operand (json_pointer::string_t)"},{"location":"api/json_pointer/operator_ne/#parameters","title":"Parameters","text":"lhs (in) first value to consider rhs (in) second value to consider"},{"location":"api/json_pointer/operator_ne/#return-value","title":"Return value","text":"

    whether the values lhs/*this and rhs are not equal

    "},{"location":"api/json_pointer/operator_ne/#exception-safety","title":"Exception safety","text":"
    1. No-throw guarantee: this function never throws exceptions.
    2. Strong exception safety: if an exception occurs, the original value stays intact.
    "},{"location":"api/json_pointer/operator_ne/#exceptions","title":"Exceptions","text":"
    1. (none)
    2. The function can throw the following exceptions:
    3. Throws parse_error.107 if the given JSON pointer s is nonempty and does not begin with a slash (/); see example below.
    4. Throws parse_error.108 if a tilde (~) in the given JSON pointer s is not followed by 0 (representing ~) or 1 (representing /); see example below.
    "},{"location":"api/json_pointer/operator_ne/#complexity","title":"Complexity","text":"

    Constant if lhs and rhs differ in the number of reference tokens, otherwise linear in the number of reference tokens.

    "},{"location":"api/json_pointer/operator_ne/#notes","title":"Notes","text":"

    Operator overload resolution

    Since C++20 overload resolution will consider the rewritten candidate generated from operator==.

    Deprecation

    Overload 2 is deprecated and will be removed in a future major version release.

    "},{"location":"api/json_pointer/operator_ne/#examples","title":"Examples","text":"Example: (1) Comparing JSON pointers

    The example demonstrates comparing JSON pointers.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // different JSON pointers\n    json::json_pointer ptr0;\n    json::json_pointer ptr1(\"\");\n    json::json_pointer ptr2(\"/foo\");\n\n    // compare JSON pointers\n    std::cout << std::boolalpha\n              << \"\\\"\" << ptr0 << \"\\\" != \\\"\" << ptr0 << \"\\\": \" << (ptr0 != ptr0) << '\\n'\n              << \"\\\"\" << ptr0 << \"\\\" != \\\"\" << ptr1 << \"\\\": \" << (ptr0 != ptr1) << '\\n'\n              << \"\\\"\" << ptr1 << \"\\\" != \\\"\" << ptr2 << \"\\\": \" << (ptr1 != ptr2) << '\\n'\n              << \"\\\"\" << ptr2 << \"\\\" != \\\"\" << ptr2 << \"\\\": \" << (ptr2 != ptr2) << std::endl;\n}\n

    Output:

    \"\" != \"\": false\n\"\" != \"\": false\n\"\" != \"/foo\": true\n\"/foo\" != \"/foo\": false\n
    Example: (2) Comparing JSON pointers and strings

    The example demonstrates comparing JSON pointers and strings, and when doing so may raise an exception.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // different JSON pointers\n    json::json_pointer ptr0;\n    json::json_pointer ptr1(\"\");\n    json::json_pointer ptr2(\"/foo\");\n\n    // different strings\n    std::string str0(\"\");\n    std::string str1(\"/foo\");\n    std::string str2(\"bar\");\n\n    // compare JSON pointers and strings\n    std::cout << std::boolalpha\n              << \"\\\"\" << ptr0 << \"\\\" != \\\"\" << str0 << \"\\\": \" << (ptr0 != str0) << '\\n'\n              << \"\\\"\" << str0 << \"\\\" != \\\"\" << ptr1 << \"\\\": \" << (str0 != ptr1) << '\\n'\n              << \"\\\"\" << ptr2 << \"\\\" != \\\"\" << str1 << \"\\\": \" << (ptr2 != str1) << std::endl;\n\n    try\n    {\n        std::cout << \"\\\"\" << str2 << \"\\\" != \\\"\" << ptr2 << \"\\\": \" << (str2 != ptr2) << std::endl;\n    }\n    catch (const json::parse_error& ex)\n    {\n        std::cout << ex.what() << std::endl;\n    }\n}\n

    Output:

    \"\" != \"\": false\n\"\" != \"\": false\n\"/foo\" != \"/foo\": false\n\"bar\" != \"/foo\": [json.exception.parse_error.107] parse error at byte 1: JSON pointer must be empty or begin with '/' - was: 'bar'\n
    "},{"location":"api/json_pointer/operator_ne/#version-history","title":"Version history","text":"
    1. Added in version 2.1.0.
    2. Added for backward compatibility and deprecated in version 3.11.2.
    "},{"location":"api/json_pointer/operator_slash/","title":"nlohmann::json_pointer::operator/","text":"
    // (1)\njson_pointer operator/(const json_pointer& lhs, const json_pointer& rhs);\n\n// (2)\njson_pointer operator/(const json_pointer& lhs, string_t token);\n\n// (3)\njson_pointer operator/(const json_pointer& lhs, std::size_t array_idx);\n
    1. create a new JSON pointer by appending the right JSON pointer at the end of the left JSON pointer
    2. create a new JSON pointer by appending the unescaped token at the end of the JSON pointer
    3. create a new JSON pointer by appending the array-index-token at the end of the JSON pointer
    "},{"location":"api/json_pointer/operator_slash/#parameters","title":"Parameters","text":"lhs (in) JSON pointer rhs (in) JSON pointer to append token (in) reference token to append array_idx (in) array index to append"},{"location":"api/json_pointer/operator_slash/#return-value","title":"Return value","text":"
    1. a new JSON pointer with rhs appended to lhs
    2. a new JSON pointer with unescaped token appended to lhs
    3. a new JSON pointer with array_idx appended to lhs
    "},{"location":"api/json_pointer/operator_slash/#complexity","title":"Complexity","text":"
    1. Linear in the length of lhs and rhs.
    2. Linear in the length of lhs.
    3. Linear in the length of lhs.
    "},{"location":"api/json_pointer/operator_slash/#examples","title":"Examples","text":"Example

    The example shows the usage of operator/.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // create a JSON pointer\n    json::json_pointer ptr(\"/foo\");\n\n    // append a JSON Pointer\n    std::cout << \"\\\"\" << ptr / json::json_pointer(\"/bar/baz\") << \"\\\"\\n\";\n\n    // append a string\n    std::cout << \"\\\"\" << ptr / \"fob\" << \"\\\"\\n\";\n\n    // append an array index\n    std::cout << \"\\\"\" << ptr / 42 << \"\\\"\" << std::endl;\n}\n

    Output:

    \"/foo/bar/baz\"\n\"/foo/fob\"\n\"/foo/42\"\n
    "},{"location":"api/json_pointer/operator_slash/#version-history","title":"Version history","text":"
    1. Added in version 3.6.0.
    2. Added in version 3.6.0. Changed type of token to string_t in version 3.11.0.
    3. Added in version 3.6.0.
    "},{"location":"api/json_pointer/operator_slasheq/","title":"nlohmann::json_pointer::operator/=","text":"
    // (1)\njson_pointer& operator/=(const json_pointer& ptr);\n\n// (2)\njson_pointer& operator/=(string_t token);\n\n// (3)\njson_pointer& operator/=(std::size_t array_idx)\n
    1. append another JSON pointer at the end of this JSON pointer
    2. append an unescaped reference token at the end of this JSON pointer
    3. append an array index at the end of this JSON pointer
    "},{"location":"api/json_pointer/operator_slasheq/#parameters","title":"Parameters","text":"ptr (in) JSON pointer to append token (in) reference token to append array_idx (in) array index to append"},{"location":"api/json_pointer/operator_slasheq/#return-value","title":"Return value","text":"
    1. JSON pointer with ptr appended
    2. JSON pointer with token appended without escaping token
    3. JSON pointer with array_idx appended
    "},{"location":"api/json_pointer/operator_slasheq/#complexity","title":"Complexity","text":"
    1. Linear in the length of ptr.
    2. Amortized constant.
    3. Amortized constant.
    "},{"location":"api/json_pointer/operator_slasheq/#examples","title":"Examples","text":"Example

    The example shows the usage of operator/=.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // create a JSON pointer\n    json::json_pointer ptr(\"/foo\");\n    std::cout << \"\\\"\" << ptr << \"\\\"\\n\";\n\n    // append a JSON Pointer\n    ptr /= json::json_pointer(\"/bar/baz\");\n    std::cout << \"\\\"\" << ptr << \"\\\"\\n\";\n\n    // append a string\n    ptr /= \"fob\";\n    std::cout << \"\\\"\" << ptr << \"\\\"\\n\";\n\n    // append an array index\n    ptr /= 42;\n    std::cout << \"\\\"\" << ptr << \"\\\"\" << std::endl;\n}\n

    Output:

    \"/foo\"\n\"/foo/bar/baz\"\n\"/foo/bar/baz/fob\"\n\"/foo/bar/baz/fob/42\"\n
    "},{"location":"api/json_pointer/operator_slasheq/#version-history","title":"Version history","text":"
    1. Added in version 3.6.0.
    2. Added in version 3.6.0. Changed type of token to string_t in version 3.11.0.
    3. Added in version 3.6.0.
    "},{"location":"api/json_pointer/operator_string_t/","title":"nlohmann::json_pointer::operator string_t","text":"
    operator string_t() const\n

    Return a string representation of the JSON pointer.

    "},{"location":"api/json_pointer/operator_string_t/#return-value","title":"Return value","text":"

    A string representation of the JSON pointer

    "},{"location":"api/json_pointer/operator_string_t/#possible-implementation","title":"Possible implementation","text":"
    operator string_t() const\n{\n    return to_string();\n}\n
    "},{"location":"api/json_pointer/operator_string_t/#notes","title":"Notes","text":"

    Deprecation

    This function is deprecated in favor of to_string and will be removed in a future major version release.

    "},{"location":"api/json_pointer/operator_string_t/#examples","title":"Examples","text":"Example

    The example shows how JSON Pointers can be implicitly converted to strings.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // different JSON Pointers\n    json::json_pointer ptr1(\"/foo/0\");\n    json::json_pointer ptr2(\"/a~1b\");\n\n    // implicit conversion to string\n    std::string s;\n    s += ptr1;\n    s += \"\\n\";\n    s += ptr2;\n\n    std::cout << s << std::endl;\n}\n

    Output:

    /foo/0\n/a~1b\n
    "},{"location":"api/json_pointer/operator_string_t/#see-also","title":"See also","text":"
    • string_t- type for strings
    "},{"location":"api/json_pointer/operator_string_t/#version-history","title":"Version history","text":"
    • Since version 2.0.0.
    • Changed type to string_t and deprecated in version 3.11.0.
    "},{"location":"api/json_pointer/parent_pointer/","title":"nlohmann::json_pointer::parent_pointer","text":"
    json_pointer parent_pointer() const;\n

    Returns the parent of this JSON pointer.

    "},{"location":"api/json_pointer/parent_pointer/#return-value","title":"Return value","text":"

    Parent of this JSON pointer; in case this JSON pointer is the root, the root itself is returned.

    "},{"location":"api/json_pointer/parent_pointer/#complexity","title":"Complexity","text":"

    Linear in the length of the JSON pointer.

    "},{"location":"api/json_pointer/parent_pointer/#examples","title":"Examples","text":"Example

    The example shows the result of parent_pointer for different JSON Pointers.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // different JSON Pointers\n    json::json_pointer ptr1(\"\");\n    json::json_pointer ptr2(\"/foo\");\n    json::json_pointer ptr3(\"/foo/0\");\n\n    // call parent_pointer()\n    std::cout << std::boolalpha\n              << \"parent of \\\"\" << ptr1 << \"\\\" is \\\"\" << ptr1.parent_pointer() << \"\\\"\\n\"\n              << \"parent of \\\"\" << ptr2 << \"\\\" is \\\"\" << ptr2.parent_pointer() << \"\\\"\\n\"\n              << \"parent of \\\"\" << ptr3 << \"\\\" is \\\"\" << ptr3.parent_pointer() << \"\\\"\" << std::endl;\n}\n

    Output:

    parent of \"\" is \"\"\nparent of \"/foo\" is \"\"\nparent of \"/foo/0\" is \"/foo\"\n
    "},{"location":"api/json_pointer/parent_pointer/#version-history","title":"Version history","text":"

    Added in version 3.6.0.

    "},{"location":"api/json_pointer/pop_back/","title":"nlohmann::json_pointer::pop_back","text":"
    void pop_back();\n

    Remove the last reference token.

    "},{"location":"api/json_pointer/pop_back/#exceptions","title":"Exceptions","text":"

    Throws out_of_range.405 if the JSON pointer has no parent.

    "},{"location":"api/json_pointer/pop_back/#complexity","title":"Complexity","text":"

    Constant.

    "},{"location":"api/json_pointer/pop_back/#examples","title":"Examples","text":"Example

    The example shows the usage of pop_back.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // create empty JSON Pointer\n    json::json_pointer ptr(\"/foo/bar/baz\");\n    std::cout << \"\\\"\" << ptr << \"\\\"\\n\";\n\n    // call pop_back()\n    ptr.pop_back();\n    std::cout << \"\\\"\" << ptr << \"\\\"\\n\";\n\n    ptr.pop_back();\n    std::cout << \"\\\"\" << ptr << \"\\\"\\n\";\n\n    ptr.pop_back();\n    std::cout << \"\\\"\" << ptr << \"\\\"\\n\";\n}\n

    Output:

    \"/foo/bar/baz\"\n\"/foo/bar\"\n\"/foo\"\n\"\"\n
    "},{"location":"api/json_pointer/pop_back/#version-history","title":"Version history","text":"

    Added in version 3.6.0.

    "},{"location":"api/json_pointer/push_back/","title":"nlohmann::json_pointer::push_back","text":"
    void push_back(const string_t& token);\n\nvoid push_back(string_t&& token);\n

    Append an unescaped token at the end of the reference pointer.

    "},{"location":"api/json_pointer/push_back/#parameters","title":"Parameters","text":"token (in) token to add"},{"location":"api/json_pointer/push_back/#complexity","title":"Complexity","text":"

    Amortized constant.

    "},{"location":"api/json_pointer/push_back/#examples","title":"Examples","text":"Example

    The example shows the result of push_back for different JSON Pointers.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // create empty JSON Pointer\n    json::json_pointer ptr;\n    std::cout << \"\\\"\" << ptr << \"\\\"\\n\";\n\n    // call push_back()\n    ptr.push_back(\"foo\");\n    std::cout << \"\\\"\" << ptr << \"\\\"\\n\";\n\n    ptr.push_back(\"0\");\n    std::cout << \"\\\"\" << ptr << \"\\\"\\n\";\n\n    ptr.push_back(\"bar\");\n    std::cout << \"\\\"\" << ptr << \"\\\"\\n\";\n}\n

    Output:

    \"\"\n\"/foo\"\n\"/foo/0\"\n\"/foo/0/bar\"\n
    "},{"location":"api/json_pointer/push_back/#version-history","title":"Version history","text":"
    • Added in version 3.6.0.
    • Changed type of token to string_t in version 3.11.0.
    "},{"location":"api/json_pointer/string_t/","title":"nlohmann::json_pointer::string_t","text":"
    using string_t = RefStringType;\n

    The string type used for the reference tokens making up the JSON pointer.

    See basic_json::string_t for more information.

    "},{"location":"api/json_pointer/string_t/#examples","title":"Examples","text":"Example

    The example shows the type string_t and its relation to basic_json::string_t.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    json::json_pointer::string_t s = \"This is a string.\";\n\n    std::cout << s << std::endl;\n\n    std::cout << std::boolalpha << std::is_same<json::json_pointer::string_t, json::string_t>::value << std::endl;\n}\n

    Output:

    This is a string.\ntrue\n
    "},{"location":"api/json_pointer/string_t/#version-history","title":"Version history","text":"
    • Added in version 3.11.0.
    "},{"location":"api/json_pointer/to_string/","title":"nlohmann::json_pointer::to_string","text":"
    string_t to_string() const;\n

    Return a string representation of the JSON pointer.

    "},{"location":"api/json_pointer/to_string/#return-value","title":"Return value","text":"

    A string representation of the JSON pointer

    "},{"location":"api/json_pointer/to_string/#notes","title":"Notes","text":"

    For each JSON pointer ptr, it holds:

    ptr == json_pointer(ptr.to_string());\n
    "},{"location":"api/json_pointer/to_string/#examples","title":"Examples","text":"Example

    The example shows the result of to_string.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // different JSON Pointers\n    json::json_pointer ptr1(\"\");\n    json::json_pointer ptr2(\"/foo\");\n    json::json_pointer ptr3(\"/foo/0\");\n    json::json_pointer ptr4(\"/\");\n    json::json_pointer ptr5(\"/a~1b\");\n    json::json_pointer ptr6(\"/c%d\");\n    json::json_pointer ptr7(\"/e^f\");\n    json::json_pointer ptr8(\"/g|h\");\n    json::json_pointer ptr9(\"/i\\\\j\");\n    json::json_pointer ptr10(\"/k\\\"l\");\n    json::json_pointer ptr11(\"/ \");\n    json::json_pointer ptr12(\"/m~0n\");\n\n    std::cout << \"\\\"\" << ptr1.to_string() << \"\\\"\\n\"\n              << \"\\\"\" << ptr2.to_string() << \"\\\"\\n\"\n              << \"\\\"\" << ptr3.to_string() << \"\\\"\\n\"\n              << \"\\\"\" << ptr4.to_string() << \"\\\"\\n\"\n              << \"\\\"\" << ptr5.to_string() << \"\\\"\\n\"\n              << \"\\\"\" << ptr6.to_string() << \"\\\"\\n\"\n              << \"\\\"\" << ptr7.to_string() << \"\\\"\\n\"\n              << \"\\\"\" << ptr8.to_string() << \"\\\"\\n\"\n              << \"\\\"\" << ptr9.to_string() << \"\\\"\\n\"\n              << \"\\\"\" << ptr10.to_string() << \"\\\"\\n\"\n              << \"\\\"\" << ptr11.to_string() << \"\\\"\\n\"\n              << \"\\\"\" << ptr12.to_string() << \"\\\"\" << std::endl;\n}\n

    Output:

    \"\"\n\"/foo\"\n\"/foo/0\"\n\"/\"\n\"/a~1b\"\n\"/c%d\"\n\"/e^f\"\n\"/g|h\"\n\"/i\\j\"\n\"/k\"l\"\n\"/ \"\n\"/m~0n\"\n
    "},{"location":"api/json_pointer/to_string/#version-history","title":"Version history","text":"
    • Since version 2.0.0.
    • Changed return type to string_t in version 3.11.0.
    "},{"location":"api/json_sax/","title":"nlohmann::json_sax","text":"
    template<typename BasicJsonType>\nstruct json_sax;\n

    This class describes the SAX interface used by sax_parse. Each function is called in different situations while the input is parsed. The boolean return value informs the parser whether to continue processing the input.

    "},{"location":"api/json_sax/#template-parameters","title":"Template parameters","text":"BasicJsonType a specialization of basic_json"},{"location":"api/json_sax/#member-types","title":"Member types","text":"
    • number_integer_t - BasicJsonType's type for numbers (integer)
    • number_unsigned_t - BasicJsonType's type for numbers (unsigned)
    • number_float_t - BasicJsonType's type for numbers (floating-point)
    • string_t - BasicJsonType's type for strings
    • binary_t - BasicJsonType's type for binary arrays
    "},{"location":"api/json_sax/#member-functions","title":"Member functions","text":"
    • binary (virtual) - a binary value was read
    • boolean (virtual) - a boolean value was read
    • end_array (virtual) - the end of an array was read
    • end_object (virtual) - the end of an object was read
    • key (virtual) - an object key was read
    • null (virtual) - a null value was read
    • number_float (virtual) - a floating-point number was read
    • number_integer (virtual) - an integer number was read
    • number_unsigned (virtual) - an unsigned integer number was read
    • parse_error (virtual) - a parse error occurred
    • start_array (virtual) - the beginning of an array was read
    • start_object (virtual) - the beginning of an object was read
    • string (virtual) - a string value was read
    "},{"location":"api/json_sax/#version-history","title":"Version history","text":"
    • Added in version 3.2.0.
    • Support for binary values (binary_t, binary) added in version 3.8.0.
    "},{"location":"api/json_sax/binary/","title":"nlohmann::json_sax::binary","text":"
    virtual bool binary(binary_t& val) = 0;\n

    A binary value was read.

    "},{"location":"api/json_sax/binary/#parameters","title":"Parameters","text":"val (in) binary value"},{"location":"api/json_sax/binary/#return-value","title":"Return value","text":"

    Whether parsing should proceed.

    "},{"location":"api/json_sax/binary/#notes","title":"Notes","text":"

    It is safe to move the passed binary value.

    "},{"location":"api/json_sax/binary/#examples","title":"Examples","text":"Example

    The example below shows how the SAX interface is used.

    #include <iostream>\n#include <iomanip>\n#include <sstream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\n// a simple event consumer that collects string representations of the passed\n// values; note inheriting from json::json_sax_t is not required, but can\n// help not to forget a required function\nclass sax_event_consumer : public json::json_sax_t\n{\n  public:\n    std::vector<std::string> events;\n\n    bool null() override\n    {\n        events.push_back(\"null()\");\n        return true;\n    }\n\n    bool boolean(bool val) override\n    {\n        events.push_back(\"boolean(val=\" + std::string(val ? \"true\" : \"false\") + \")\");\n        return true;\n    }\n\n    bool number_integer(number_integer_t val) override\n    {\n        events.push_back(\"number_integer(val=\" + std::to_string(val) + \")\");\n        return true;\n    }\n\n    bool number_unsigned(number_unsigned_t val) override\n    {\n        events.push_back(\"number_unsigned(val=\" + std::to_string(val) + \")\");\n        return true;\n    }\n\n    bool number_float(number_float_t val, const string_t& s) override\n    {\n        events.push_back(\"number_float(val=\" + std::to_string(val) + \", s=\" + s + \")\");\n        return true;\n    }\n\n    bool string(string_t& val) override\n    {\n        events.push_back(\"string(val=\" + val + \")\");\n        return true;\n    }\n\n    bool start_object(std::size_t elements) override\n    {\n        events.push_back(\"start_object(elements=\" + std::to_string(elements) + \")\");\n        return true;\n    }\n\n    bool end_object() override\n    {\n        events.push_back(\"end_object()\");\n        return true;\n    }\n\n    bool start_array(std::size_t elements) override\n    {\n        events.push_back(\"start_array(elements=\" + std::to_string(elements) + \")\");\n        return true;\n    }\n\n    bool end_array() override\n    {\n        events.push_back(\"end_array()\");\n        return true;\n    }\n\n    bool key(string_t& val) override\n    {\n        events.push_back(\"key(val=\" + val + \")\");\n        return true;\n    }\n\n    bool binary(json::binary_t& val) override\n    {\n        events.push_back(\"binary(val=[...])\");\n        return true;\n    }\n\n    bool parse_error(std::size_t position, const std::string& last_token, const json::exception& ex) override\n    {\n        events.push_back(\"parse_error(position=\" + std::to_string(position) + \", last_token=\" + last_token + \",\\n            ex=\" + std::string(ex.what()) + \")\");\n        return false;\n    }\n};\n\nint main()\n{\n    // CBOR byte string\n    std::vector<std::uint8_t> vec = {{0x44, 0xcA, 0xfe, 0xba, 0xbe}};\n\n    // create a SAX event consumer object\n    sax_event_consumer sec;\n\n    // parse CBOR\n    bool result = json::sax_parse(vec, &sec, json::input_format_t::cbor);\n\n    // output the recorded events\n    for (auto& event : sec.events)\n    {\n        std::cout << event << \"\\n\";\n    }\n\n    // output the result of sax_parse\n    std::cout << \"\\nresult: \" << std::boolalpha << result << std::endl;\n}\n

    Output:

    binary(val=[...])\n\nresult: true\n
    "},{"location":"api/json_sax/binary/#version-history","title":"Version history","text":"
    • Added in version 3.8.0.
    "},{"location":"api/json_sax/boolean/","title":"nlohmann::json_sax::boolean","text":"
    virtual bool boolean(bool val) = 0;\n

    A boolean value was read.

    "},{"location":"api/json_sax/boolean/#parameters","title":"Parameters","text":"val (in) boolean value"},{"location":"api/json_sax/boolean/#return-value","title":"Return value","text":"

    Whether parsing should proceed.

    "},{"location":"api/json_sax/boolean/#examples","title":"Examples","text":"Example

    The example below shows how the SAX interface is used.

    #include <iostream>\n#include <iomanip>\n#include <sstream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\n// a simple event consumer that collects string representations of the passed\n// values; note inheriting from json::json_sax_t is not required, but can\n// help not to forget a required function\nclass sax_event_consumer : public json::json_sax_t\n{\n  public:\n    std::vector<std::string> events;\n\n    bool null() override\n    {\n        events.push_back(\"null()\");\n        return true;\n    }\n\n    bool boolean(bool val) override\n    {\n        events.push_back(\"boolean(val=\" + std::string(val ? \"true\" : \"false\") + \")\");\n        return true;\n    }\n\n    bool number_integer(number_integer_t val) override\n    {\n        events.push_back(\"number_integer(val=\" + std::to_string(val) + \")\");\n        return true;\n    }\n\n    bool number_unsigned(number_unsigned_t val) override\n    {\n        events.push_back(\"number_unsigned(val=\" + std::to_string(val) + \")\");\n        return true;\n    }\n\n    bool number_float(number_float_t val, const string_t& s) override\n    {\n        events.push_back(\"number_float(val=\" + std::to_string(val) + \", s=\" + s + \")\");\n        return true;\n    }\n\n    bool string(string_t& val) override\n    {\n        events.push_back(\"string(val=\" + val + \")\");\n        return true;\n    }\n\n    bool start_object(std::size_t elements) override\n    {\n        events.push_back(\"start_object(elements=\" + std::to_string(elements) + \")\");\n        return true;\n    }\n\n    bool end_object() override\n    {\n        events.push_back(\"end_object()\");\n        return true;\n    }\n\n    bool start_array(std::size_t elements) override\n    {\n        events.push_back(\"start_array(elements=\" + std::to_string(elements) + \")\");\n        return true;\n    }\n\n    bool end_array() override\n    {\n        events.push_back(\"end_array()\");\n        return true;\n    }\n\n    bool key(string_t& val) override\n    {\n        events.push_back(\"key(val=\" + val + \")\");\n        return true;\n    }\n\n    bool binary(json::binary_t& val) override\n    {\n        events.push_back(\"binary(val=[...])\");\n        return true;\n    }\n\n    bool parse_error(std::size_t position, const std::string& last_token, const json::exception& ex) override\n    {\n        events.push_back(\"parse_error(position=\" + std::to_string(position) + \", last_token=\" + last_token + \",\\n            ex=\" + std::string(ex.what()) + \")\");\n        return false;\n    }\n};\n\nint main()\n{\n    // a JSON text\n    auto text = R\"(\n    {\n        \"Image\": {\n            \"Width\":  800,\n            \"Height\": 600,\n            \"Title\":  \"View from 15th Floor\",\n            \"Thumbnail\": {\n                \"Url\":    \"http://www.example.com/image/481989943\",\n                \"Height\": 125,\n                \"Width\":  100\n            },\n            \"Animated\" : false,\n            \"IDs\": [116, 943, 234, -38793],\n            \"DeletionDate\": null,\n            \"Distance\": 12.723374634\n        }\n    }]\n    )\";\n\n    // create a SAX event consumer object\n    sax_event_consumer sec;\n\n    // parse JSON\n    bool result = json::sax_parse(text, &sec);\n\n    // output the recorded events\n    for (auto& event : sec.events)\n    {\n        std::cout << event << \"\\n\";\n    }\n\n    // output the result of sax_parse\n    std::cout << \"\\nresult: \" << std::boolalpha << result << std::endl;\n}\n

    Output:

    start_object(elements=18446744073709551615)\nkey(val=Image)\nstart_object(elements=18446744073709551615)\nkey(val=Width)\nnumber_unsigned(val=800)\nkey(val=Height)\nnumber_unsigned(val=600)\nkey(val=Title)\nstring(val=View from 15th Floor)\nkey(val=Thumbnail)\nstart_object(elements=18446744073709551615)\nkey(val=Url)\nstring(val=http://www.example.com/image/481989943)\nkey(val=Height)\nnumber_unsigned(val=125)\nkey(val=Width)\nnumber_unsigned(val=100)\nend_object()\nkey(val=Animated)\nboolean(val=false)\nkey(val=IDs)\nstart_array(elements=18446744073709551615)\nnumber_unsigned(val=116)\nnumber_unsigned(val=943)\nnumber_unsigned(val=234)\nnumber_integer(val=-38793)\nend_array()\nkey(val=DeletionDate)\nnull()\nkey(val=Distance)\nnumber_float(val=12.723375, s=12.723374634)\nend_object()\nend_object()\nparse_error(position=460, last_token=12.723374634<U+000A>        }<U+000A>    }],\n            ex=[json.exception.parse_error.101] parse error at line 17, column 6: syntax error while parsing value - unexpected ']'; expected end of input)\n\nresult: false\n
    "},{"location":"api/json_sax/boolean/#version-history","title":"Version history","text":"
    • Added in version 3.2.0.
    "},{"location":"api/json_sax/end_array/","title":"nlohmann::json_sax::end_array","text":"
    virtual bool end_array() = 0;\n

    The end of an array was read.

    "},{"location":"api/json_sax/end_array/#return-value","title":"Return value","text":"

    Whether parsing should proceed.

    "},{"location":"api/json_sax/end_array/#examples","title":"Examples","text":"Example

    The example below shows how the SAX interface is used.

    #include <iostream>\n#include <iomanip>\n#include <sstream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\n// a simple event consumer that collects string representations of the passed\n// values; note inheriting from json::json_sax_t is not required, but can\n// help not to forget a required function\nclass sax_event_consumer : public json::json_sax_t\n{\n  public:\n    std::vector<std::string> events;\n\n    bool null() override\n    {\n        events.push_back(\"null()\");\n        return true;\n    }\n\n    bool boolean(bool val) override\n    {\n        events.push_back(\"boolean(val=\" + std::string(val ? \"true\" : \"false\") + \")\");\n        return true;\n    }\n\n    bool number_integer(number_integer_t val) override\n    {\n        events.push_back(\"number_integer(val=\" + std::to_string(val) + \")\");\n        return true;\n    }\n\n    bool number_unsigned(number_unsigned_t val) override\n    {\n        events.push_back(\"number_unsigned(val=\" + std::to_string(val) + \")\");\n        return true;\n    }\n\n    bool number_float(number_float_t val, const string_t& s) override\n    {\n        events.push_back(\"number_float(val=\" + std::to_string(val) + \", s=\" + s + \")\");\n        return true;\n    }\n\n    bool string(string_t& val) override\n    {\n        events.push_back(\"string(val=\" + val + \")\");\n        return true;\n    }\n\n    bool start_object(std::size_t elements) override\n    {\n        events.push_back(\"start_object(elements=\" + std::to_string(elements) + \")\");\n        return true;\n    }\n\n    bool end_object() override\n    {\n        events.push_back(\"end_object()\");\n        return true;\n    }\n\n    bool start_array(std::size_t elements) override\n    {\n        events.push_back(\"start_array(elements=\" + std::to_string(elements) + \")\");\n        return true;\n    }\n\n    bool end_array() override\n    {\n        events.push_back(\"end_array()\");\n        return true;\n    }\n\n    bool key(string_t& val) override\n    {\n        events.push_back(\"key(val=\" + val + \")\");\n        return true;\n    }\n\n    bool binary(json::binary_t& val) override\n    {\n        events.push_back(\"binary(val=[...])\");\n        return true;\n    }\n\n    bool parse_error(std::size_t position, const std::string& last_token, const json::exception& ex) override\n    {\n        events.push_back(\"parse_error(position=\" + std::to_string(position) + \", last_token=\" + last_token + \",\\n            ex=\" + std::string(ex.what()) + \")\");\n        return false;\n    }\n};\n\nint main()\n{\n    // a JSON text\n    auto text = R\"(\n    {\n        \"Image\": {\n            \"Width\":  800,\n            \"Height\": 600,\n            \"Title\":  \"View from 15th Floor\",\n            \"Thumbnail\": {\n                \"Url\":    \"http://www.example.com/image/481989943\",\n                \"Height\": 125,\n                \"Width\":  100\n            },\n            \"Animated\" : false,\n            \"IDs\": [116, 943, 234, -38793],\n            \"DeletionDate\": null,\n            \"Distance\": 12.723374634\n        }\n    }]\n    )\";\n\n    // create a SAX event consumer object\n    sax_event_consumer sec;\n\n    // parse JSON\n    bool result = json::sax_parse(text, &sec);\n\n    // output the recorded events\n    for (auto& event : sec.events)\n    {\n        std::cout << event << \"\\n\";\n    }\n\n    // output the result of sax_parse\n    std::cout << \"\\nresult: \" << std::boolalpha << result << std::endl;\n}\n

    Output:

    start_object(elements=18446744073709551615)\nkey(val=Image)\nstart_object(elements=18446744073709551615)\nkey(val=Width)\nnumber_unsigned(val=800)\nkey(val=Height)\nnumber_unsigned(val=600)\nkey(val=Title)\nstring(val=View from 15th Floor)\nkey(val=Thumbnail)\nstart_object(elements=18446744073709551615)\nkey(val=Url)\nstring(val=http://www.example.com/image/481989943)\nkey(val=Height)\nnumber_unsigned(val=125)\nkey(val=Width)\nnumber_unsigned(val=100)\nend_object()\nkey(val=Animated)\nboolean(val=false)\nkey(val=IDs)\nstart_array(elements=18446744073709551615)\nnumber_unsigned(val=116)\nnumber_unsigned(val=943)\nnumber_unsigned(val=234)\nnumber_integer(val=-38793)\nend_array()\nkey(val=DeletionDate)\nnull()\nkey(val=Distance)\nnumber_float(val=12.723375, s=12.723374634)\nend_object()\nend_object()\nparse_error(position=460, last_token=12.723374634<U+000A>        }<U+000A>    }],\n            ex=[json.exception.parse_error.101] parse error at line 17, column 6: syntax error while parsing value - unexpected ']'; expected end of input)\n\nresult: false\n
    "},{"location":"api/json_sax/end_array/#version-history","title":"Version history","text":"
    • Added in version 3.2.0.
    "},{"location":"api/json_sax/end_object/","title":"nlohmann::json_sax::end_object","text":"
    virtual bool end_object() = 0;\n

    The end of an object was read.

    "},{"location":"api/json_sax/end_object/#return-value","title":"Return value","text":"

    Whether parsing should proceed.

    "},{"location":"api/json_sax/end_object/#examples","title":"Examples","text":"Example

    The example below shows how the SAX interface is used.

    #include <iostream>\n#include <iomanip>\n#include <sstream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\n// a simple event consumer that collects string representations of the passed\n// values; note inheriting from json::json_sax_t is not required, but can\n// help not to forget a required function\nclass sax_event_consumer : public json::json_sax_t\n{\n  public:\n    std::vector<std::string> events;\n\n    bool null() override\n    {\n        events.push_back(\"null()\");\n        return true;\n    }\n\n    bool boolean(bool val) override\n    {\n        events.push_back(\"boolean(val=\" + std::string(val ? \"true\" : \"false\") + \")\");\n        return true;\n    }\n\n    bool number_integer(number_integer_t val) override\n    {\n        events.push_back(\"number_integer(val=\" + std::to_string(val) + \")\");\n        return true;\n    }\n\n    bool number_unsigned(number_unsigned_t val) override\n    {\n        events.push_back(\"number_unsigned(val=\" + std::to_string(val) + \")\");\n        return true;\n    }\n\n    bool number_float(number_float_t val, const string_t& s) override\n    {\n        events.push_back(\"number_float(val=\" + std::to_string(val) + \", s=\" + s + \")\");\n        return true;\n    }\n\n    bool string(string_t& val) override\n    {\n        events.push_back(\"string(val=\" + val + \")\");\n        return true;\n    }\n\n    bool start_object(std::size_t elements) override\n    {\n        events.push_back(\"start_object(elements=\" + std::to_string(elements) + \")\");\n        return true;\n    }\n\n    bool end_object() override\n    {\n        events.push_back(\"end_object()\");\n        return true;\n    }\n\n    bool start_array(std::size_t elements) override\n    {\n        events.push_back(\"start_array(elements=\" + std::to_string(elements) + \")\");\n        return true;\n    }\n\n    bool end_array() override\n    {\n        events.push_back(\"end_array()\");\n        return true;\n    }\n\n    bool key(string_t& val) override\n    {\n        events.push_back(\"key(val=\" + val + \")\");\n        return true;\n    }\n\n    bool binary(json::binary_t& val) override\n    {\n        events.push_back(\"binary(val=[...])\");\n        return true;\n    }\n\n    bool parse_error(std::size_t position, const std::string& last_token, const json::exception& ex) override\n    {\n        events.push_back(\"parse_error(position=\" + std::to_string(position) + \", last_token=\" + last_token + \",\\n            ex=\" + std::string(ex.what()) + \")\");\n        return false;\n    }\n};\n\nint main()\n{\n    // a JSON text\n    auto text = R\"(\n    {\n        \"Image\": {\n            \"Width\":  800,\n            \"Height\": 600,\n            \"Title\":  \"View from 15th Floor\",\n            \"Thumbnail\": {\n                \"Url\":    \"http://www.example.com/image/481989943\",\n                \"Height\": 125,\n                \"Width\":  100\n            },\n            \"Animated\" : false,\n            \"IDs\": [116, 943, 234, -38793],\n            \"DeletionDate\": null,\n            \"Distance\": 12.723374634\n        }\n    }]\n    )\";\n\n    // create a SAX event consumer object\n    sax_event_consumer sec;\n\n    // parse JSON\n    bool result = json::sax_parse(text, &sec);\n\n    // output the recorded events\n    for (auto& event : sec.events)\n    {\n        std::cout << event << \"\\n\";\n    }\n\n    // output the result of sax_parse\n    std::cout << \"\\nresult: \" << std::boolalpha << result << std::endl;\n}\n

    Output:

    start_object(elements=18446744073709551615)\nkey(val=Image)\nstart_object(elements=18446744073709551615)\nkey(val=Width)\nnumber_unsigned(val=800)\nkey(val=Height)\nnumber_unsigned(val=600)\nkey(val=Title)\nstring(val=View from 15th Floor)\nkey(val=Thumbnail)\nstart_object(elements=18446744073709551615)\nkey(val=Url)\nstring(val=http://www.example.com/image/481989943)\nkey(val=Height)\nnumber_unsigned(val=125)\nkey(val=Width)\nnumber_unsigned(val=100)\nend_object()\nkey(val=Animated)\nboolean(val=false)\nkey(val=IDs)\nstart_array(elements=18446744073709551615)\nnumber_unsigned(val=116)\nnumber_unsigned(val=943)\nnumber_unsigned(val=234)\nnumber_integer(val=-38793)\nend_array()\nkey(val=DeletionDate)\nnull()\nkey(val=Distance)\nnumber_float(val=12.723375, s=12.723374634)\nend_object()\nend_object()\nparse_error(position=460, last_token=12.723374634<U+000A>        }<U+000A>    }],\n            ex=[json.exception.parse_error.101] parse error at line 17, column 6: syntax error while parsing value - unexpected ']'; expected end of input)\n\nresult: false\n
    "},{"location":"api/json_sax/end_object/#version-history","title":"Version history","text":"
    • Added in version 3.2.0.
    "},{"location":"api/json_sax/key/","title":"nlohmann::json_sax::key","text":"
    virtual bool key(string_t& val) = 0;\n

    An object key was read.

    "},{"location":"api/json_sax/key/#parameters","title":"Parameters","text":"val (in) object key"},{"location":"api/json_sax/key/#return-value","title":"Return value","text":"

    Whether parsing should proceed.

    "},{"location":"api/json_sax/key/#notes","title":"Notes","text":"

    It is safe to move the passed object key value.

    "},{"location":"api/json_sax/key/#examples","title":"Examples","text":"Example

    The example below shows how the SAX interface is used.

    #include <iostream>\n#include <iomanip>\n#include <sstream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\n// a simple event consumer that collects string representations of the passed\n// values; note inheriting from json::json_sax_t is not required, but can\n// help not to forget a required function\nclass sax_event_consumer : public json::json_sax_t\n{\n  public:\n    std::vector<std::string> events;\n\n    bool null() override\n    {\n        events.push_back(\"null()\");\n        return true;\n    }\n\n    bool boolean(bool val) override\n    {\n        events.push_back(\"boolean(val=\" + std::string(val ? \"true\" : \"false\") + \")\");\n        return true;\n    }\n\n    bool number_integer(number_integer_t val) override\n    {\n        events.push_back(\"number_integer(val=\" + std::to_string(val) + \")\");\n        return true;\n    }\n\n    bool number_unsigned(number_unsigned_t val) override\n    {\n        events.push_back(\"number_unsigned(val=\" + std::to_string(val) + \")\");\n        return true;\n    }\n\n    bool number_float(number_float_t val, const string_t& s) override\n    {\n        events.push_back(\"number_float(val=\" + std::to_string(val) + \", s=\" + s + \")\");\n        return true;\n    }\n\n    bool string(string_t& val) override\n    {\n        events.push_back(\"string(val=\" + val + \")\");\n        return true;\n    }\n\n    bool start_object(std::size_t elements) override\n    {\n        events.push_back(\"start_object(elements=\" + std::to_string(elements) + \")\");\n        return true;\n    }\n\n    bool end_object() override\n    {\n        events.push_back(\"end_object()\");\n        return true;\n    }\n\n    bool start_array(std::size_t elements) override\n    {\n        events.push_back(\"start_array(elements=\" + std::to_string(elements) + \")\");\n        return true;\n    }\n\n    bool end_array() override\n    {\n        events.push_back(\"end_array()\");\n        return true;\n    }\n\n    bool key(string_t& val) override\n    {\n        events.push_back(\"key(val=\" + val + \")\");\n        return true;\n    }\n\n    bool binary(json::binary_t& val) override\n    {\n        events.push_back(\"binary(val=[...])\");\n        return true;\n    }\n\n    bool parse_error(std::size_t position, const std::string& last_token, const json::exception& ex) override\n    {\n        events.push_back(\"parse_error(position=\" + std::to_string(position) + \", last_token=\" + last_token + \",\\n            ex=\" + std::string(ex.what()) + \")\");\n        return false;\n    }\n};\n\nint main()\n{\n    // a JSON text\n    auto text = R\"(\n    {\n        \"Image\": {\n            \"Width\":  800,\n            \"Height\": 600,\n            \"Title\":  \"View from 15th Floor\",\n            \"Thumbnail\": {\n                \"Url\":    \"http://www.example.com/image/481989943\",\n                \"Height\": 125,\n                \"Width\":  100\n            },\n            \"Animated\" : false,\n            \"IDs\": [116, 943, 234, -38793],\n            \"DeletionDate\": null,\n            \"Distance\": 12.723374634\n        }\n    }]\n    )\";\n\n    // create a SAX event consumer object\n    sax_event_consumer sec;\n\n    // parse JSON\n    bool result = json::sax_parse(text, &sec);\n\n    // output the recorded events\n    for (auto& event : sec.events)\n    {\n        std::cout << event << \"\\n\";\n    }\n\n    // output the result of sax_parse\n    std::cout << \"\\nresult: \" << std::boolalpha << result << std::endl;\n}\n

    Output:

    start_object(elements=18446744073709551615)\nkey(val=Image)\nstart_object(elements=18446744073709551615)\nkey(val=Width)\nnumber_unsigned(val=800)\nkey(val=Height)\nnumber_unsigned(val=600)\nkey(val=Title)\nstring(val=View from 15th Floor)\nkey(val=Thumbnail)\nstart_object(elements=18446744073709551615)\nkey(val=Url)\nstring(val=http://www.example.com/image/481989943)\nkey(val=Height)\nnumber_unsigned(val=125)\nkey(val=Width)\nnumber_unsigned(val=100)\nend_object()\nkey(val=Animated)\nboolean(val=false)\nkey(val=IDs)\nstart_array(elements=18446744073709551615)\nnumber_unsigned(val=116)\nnumber_unsigned(val=943)\nnumber_unsigned(val=234)\nnumber_integer(val=-38793)\nend_array()\nkey(val=DeletionDate)\nnull()\nkey(val=Distance)\nnumber_float(val=12.723375, s=12.723374634)\nend_object()\nend_object()\nparse_error(position=460, last_token=12.723374634<U+000A>        }<U+000A>    }],\n            ex=[json.exception.parse_error.101] parse error at line 17, column 6: syntax error while parsing value - unexpected ']'; expected end of input)\n\nresult: false\n
    "},{"location":"api/json_sax/key/#version-history","title":"Version history","text":"
    • Added in version 3.2.0.
    "},{"location":"api/json_sax/null/","title":"nlohmann::json_sax::null","text":"
    virtual bool null() = 0;\n

    A null value was read.

    "},{"location":"api/json_sax/null/#return-value","title":"Return value","text":"

    Whether parsing should proceed.

    "},{"location":"api/json_sax/null/#examples","title":"Examples","text":"Example

    The example below shows how the SAX interface is used.

    #include <iostream>\n#include <iomanip>\n#include <sstream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\n// a simple event consumer that collects string representations of the passed\n// values; note inheriting from json::json_sax_t is not required, but can\n// help not to forget a required function\nclass sax_event_consumer : public json::json_sax_t\n{\n  public:\n    std::vector<std::string> events;\n\n    bool null() override\n    {\n        events.push_back(\"null()\");\n        return true;\n    }\n\n    bool boolean(bool val) override\n    {\n        events.push_back(\"boolean(val=\" + std::string(val ? \"true\" : \"false\") + \")\");\n        return true;\n    }\n\n    bool number_integer(number_integer_t val) override\n    {\n        events.push_back(\"number_integer(val=\" + std::to_string(val) + \")\");\n        return true;\n    }\n\n    bool number_unsigned(number_unsigned_t val) override\n    {\n        events.push_back(\"number_unsigned(val=\" + std::to_string(val) + \")\");\n        return true;\n    }\n\n    bool number_float(number_float_t val, const string_t& s) override\n    {\n        events.push_back(\"number_float(val=\" + std::to_string(val) + \", s=\" + s + \")\");\n        return true;\n    }\n\n    bool string(string_t& val) override\n    {\n        events.push_back(\"string(val=\" + val + \")\");\n        return true;\n    }\n\n    bool start_object(std::size_t elements) override\n    {\n        events.push_back(\"start_object(elements=\" + std::to_string(elements) + \")\");\n        return true;\n    }\n\n    bool end_object() override\n    {\n        events.push_back(\"end_object()\");\n        return true;\n    }\n\n    bool start_array(std::size_t elements) override\n    {\n        events.push_back(\"start_array(elements=\" + std::to_string(elements) + \")\");\n        return true;\n    }\n\n    bool end_array() override\n    {\n        events.push_back(\"end_array()\");\n        return true;\n    }\n\n    bool key(string_t& val) override\n    {\n        events.push_back(\"key(val=\" + val + \")\");\n        return true;\n    }\n\n    bool binary(json::binary_t& val) override\n    {\n        events.push_back(\"binary(val=[...])\");\n        return true;\n    }\n\n    bool parse_error(std::size_t position, const std::string& last_token, const json::exception& ex) override\n    {\n        events.push_back(\"parse_error(position=\" + std::to_string(position) + \", last_token=\" + last_token + \",\\n            ex=\" + std::string(ex.what()) + \")\");\n        return false;\n    }\n};\n\nint main()\n{\n    // a JSON text\n    auto text = R\"(\n    {\n        \"Image\": {\n            \"Width\":  800,\n            \"Height\": 600,\n            \"Title\":  \"View from 15th Floor\",\n            \"Thumbnail\": {\n                \"Url\":    \"http://www.example.com/image/481989943\",\n                \"Height\": 125,\n                \"Width\":  100\n            },\n            \"Animated\" : false,\n            \"IDs\": [116, 943, 234, -38793],\n            \"DeletionDate\": null,\n            \"Distance\": 12.723374634\n        }\n    }]\n    )\";\n\n    // create a SAX event consumer object\n    sax_event_consumer sec;\n\n    // parse JSON\n    bool result = json::sax_parse(text, &sec);\n\n    // output the recorded events\n    for (auto& event : sec.events)\n    {\n        std::cout << event << \"\\n\";\n    }\n\n    // output the result of sax_parse\n    std::cout << \"\\nresult: \" << std::boolalpha << result << std::endl;\n}\n

    Output:

    start_object(elements=18446744073709551615)\nkey(val=Image)\nstart_object(elements=18446744073709551615)\nkey(val=Width)\nnumber_unsigned(val=800)\nkey(val=Height)\nnumber_unsigned(val=600)\nkey(val=Title)\nstring(val=View from 15th Floor)\nkey(val=Thumbnail)\nstart_object(elements=18446744073709551615)\nkey(val=Url)\nstring(val=http://www.example.com/image/481989943)\nkey(val=Height)\nnumber_unsigned(val=125)\nkey(val=Width)\nnumber_unsigned(val=100)\nend_object()\nkey(val=Animated)\nboolean(val=false)\nkey(val=IDs)\nstart_array(elements=18446744073709551615)\nnumber_unsigned(val=116)\nnumber_unsigned(val=943)\nnumber_unsigned(val=234)\nnumber_integer(val=-38793)\nend_array()\nkey(val=DeletionDate)\nnull()\nkey(val=Distance)\nnumber_float(val=12.723375, s=12.723374634)\nend_object()\nend_object()\nparse_error(position=460, last_token=12.723374634<U+000A>        }<U+000A>    }],\n            ex=[json.exception.parse_error.101] parse error at line 17, column 6: syntax error while parsing value - unexpected ']'; expected end of input)\n\nresult: false\n
    "},{"location":"api/json_sax/null/#version-history","title":"Version history","text":"
    • Added in version 3.2.0.
    "},{"location":"api/json_sax/number_float/","title":"nlohmann::json_sax::number_float","text":"
    virtual bool number_float(number_float_t val, const string_t& s) = 0;\n

    A floating-point number was read.

    "},{"location":"api/json_sax/number_float/#parameters","title":"Parameters","text":"val (in) floating-point value s (in) string representation of the original input"},{"location":"api/json_sax/number_float/#return-value","title":"Return value","text":"

    Whether parsing should proceed.

    "},{"location":"api/json_sax/number_float/#examples","title":"Examples","text":"Example

    The example below shows how the SAX interface is used.

    #include <iostream>\n#include <iomanip>\n#include <sstream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\n// a simple event consumer that collects string representations of the passed\n// values; note inheriting from json::json_sax_t is not required, but can\n// help not to forget a required function\nclass sax_event_consumer : public json::json_sax_t\n{\n  public:\n    std::vector<std::string> events;\n\n    bool null() override\n    {\n        events.push_back(\"null()\");\n        return true;\n    }\n\n    bool boolean(bool val) override\n    {\n        events.push_back(\"boolean(val=\" + std::string(val ? \"true\" : \"false\") + \")\");\n        return true;\n    }\n\n    bool number_integer(number_integer_t val) override\n    {\n        events.push_back(\"number_integer(val=\" + std::to_string(val) + \")\");\n        return true;\n    }\n\n    bool number_unsigned(number_unsigned_t val) override\n    {\n        events.push_back(\"number_unsigned(val=\" + std::to_string(val) + \")\");\n        return true;\n    }\n\n    bool number_float(number_float_t val, const string_t& s) override\n    {\n        events.push_back(\"number_float(val=\" + std::to_string(val) + \", s=\" + s + \")\");\n        return true;\n    }\n\n    bool string(string_t& val) override\n    {\n        events.push_back(\"string(val=\" + val + \")\");\n        return true;\n    }\n\n    bool start_object(std::size_t elements) override\n    {\n        events.push_back(\"start_object(elements=\" + std::to_string(elements) + \")\");\n        return true;\n    }\n\n    bool end_object() override\n    {\n        events.push_back(\"end_object()\");\n        return true;\n    }\n\n    bool start_array(std::size_t elements) override\n    {\n        events.push_back(\"start_array(elements=\" + std::to_string(elements) + \")\");\n        return true;\n    }\n\n    bool end_array() override\n    {\n        events.push_back(\"end_array()\");\n        return true;\n    }\n\n    bool key(string_t& val) override\n    {\n        events.push_back(\"key(val=\" + val + \")\");\n        return true;\n    }\n\n    bool binary(json::binary_t& val) override\n    {\n        events.push_back(\"binary(val=[...])\");\n        return true;\n    }\n\n    bool parse_error(std::size_t position, const std::string& last_token, const json::exception& ex) override\n    {\n        events.push_back(\"parse_error(position=\" + std::to_string(position) + \", last_token=\" + last_token + \",\\n            ex=\" + std::string(ex.what()) + \")\");\n        return false;\n    }\n};\n\nint main()\n{\n    // a JSON text\n    auto text = R\"(\n    {\n        \"Image\": {\n            \"Width\":  800,\n            \"Height\": 600,\n            \"Title\":  \"View from 15th Floor\",\n            \"Thumbnail\": {\n                \"Url\":    \"http://www.example.com/image/481989943\",\n                \"Height\": 125,\n                \"Width\":  100\n            },\n            \"Animated\" : false,\n            \"IDs\": [116, 943, 234, -38793],\n            \"DeletionDate\": null,\n            \"Distance\": 12.723374634\n        }\n    }]\n    )\";\n\n    // create a SAX event consumer object\n    sax_event_consumer sec;\n\n    // parse JSON\n    bool result = json::sax_parse(text, &sec);\n\n    // output the recorded events\n    for (auto& event : sec.events)\n    {\n        std::cout << event << \"\\n\";\n    }\n\n    // output the result of sax_parse\n    std::cout << \"\\nresult: \" << std::boolalpha << result << std::endl;\n}\n

    Output:

    start_object(elements=18446744073709551615)\nkey(val=Image)\nstart_object(elements=18446744073709551615)\nkey(val=Width)\nnumber_unsigned(val=800)\nkey(val=Height)\nnumber_unsigned(val=600)\nkey(val=Title)\nstring(val=View from 15th Floor)\nkey(val=Thumbnail)\nstart_object(elements=18446744073709551615)\nkey(val=Url)\nstring(val=http://www.example.com/image/481989943)\nkey(val=Height)\nnumber_unsigned(val=125)\nkey(val=Width)\nnumber_unsigned(val=100)\nend_object()\nkey(val=Animated)\nboolean(val=false)\nkey(val=IDs)\nstart_array(elements=18446744073709551615)\nnumber_unsigned(val=116)\nnumber_unsigned(val=943)\nnumber_unsigned(val=234)\nnumber_integer(val=-38793)\nend_array()\nkey(val=DeletionDate)\nnull()\nkey(val=Distance)\nnumber_float(val=12.723375, s=12.723374634)\nend_object()\nend_object()\nparse_error(position=460, last_token=12.723374634<U+000A>        }<U+000A>    }],\n            ex=[json.exception.parse_error.101] parse error at line 17, column 6: syntax error while parsing value - unexpected ']'; expected end of input)\n\nresult: false\n
    "},{"location":"api/json_sax/number_float/#version-history","title":"Version history","text":"
    • Added in version 3.2.0.
    "},{"location":"api/json_sax/number_integer/","title":"nlohmann::json_sax::number_integer","text":"
    virtual bool number_integer(number_integer_t val) = 0;\n

    An integer number was read.

    "},{"location":"api/json_sax/number_integer/#parameters","title":"Parameters","text":"val (in) integer value"},{"location":"api/json_sax/number_integer/#return-value","title":"Return value","text":"

    Whether parsing should proceed.

    "},{"location":"api/json_sax/number_integer/#examples","title":"Examples","text":"Example

    The example below shows how the SAX interface is used.

    #include <iostream>\n#include <iomanip>\n#include <sstream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\n// a simple event consumer that collects string representations of the passed\n// values; note inheriting from json::json_sax_t is not required, but can\n// help not to forget a required function\nclass sax_event_consumer : public json::json_sax_t\n{\n  public:\n    std::vector<std::string> events;\n\n    bool null() override\n    {\n        events.push_back(\"null()\");\n        return true;\n    }\n\n    bool boolean(bool val) override\n    {\n        events.push_back(\"boolean(val=\" + std::string(val ? \"true\" : \"false\") + \")\");\n        return true;\n    }\n\n    bool number_integer(number_integer_t val) override\n    {\n        events.push_back(\"number_integer(val=\" + std::to_string(val) + \")\");\n        return true;\n    }\n\n    bool number_unsigned(number_unsigned_t val) override\n    {\n        events.push_back(\"number_unsigned(val=\" + std::to_string(val) + \")\");\n        return true;\n    }\n\n    bool number_float(number_float_t val, const string_t& s) override\n    {\n        events.push_back(\"number_float(val=\" + std::to_string(val) + \", s=\" + s + \")\");\n        return true;\n    }\n\n    bool string(string_t& val) override\n    {\n        events.push_back(\"string(val=\" + val + \")\");\n        return true;\n    }\n\n    bool start_object(std::size_t elements) override\n    {\n        events.push_back(\"start_object(elements=\" + std::to_string(elements) + \")\");\n        return true;\n    }\n\n    bool end_object() override\n    {\n        events.push_back(\"end_object()\");\n        return true;\n    }\n\n    bool start_array(std::size_t elements) override\n    {\n        events.push_back(\"start_array(elements=\" + std::to_string(elements) + \")\");\n        return true;\n    }\n\n    bool end_array() override\n    {\n        events.push_back(\"end_array()\");\n        return true;\n    }\n\n    bool key(string_t& val) override\n    {\n        events.push_back(\"key(val=\" + val + \")\");\n        return true;\n    }\n\n    bool binary(json::binary_t& val) override\n    {\n        events.push_back(\"binary(val=[...])\");\n        return true;\n    }\n\n    bool parse_error(std::size_t position, const std::string& last_token, const json::exception& ex) override\n    {\n        events.push_back(\"parse_error(position=\" + std::to_string(position) + \", last_token=\" + last_token + \",\\n            ex=\" + std::string(ex.what()) + \")\");\n        return false;\n    }\n};\n\nint main()\n{\n    // a JSON text\n    auto text = R\"(\n    {\n        \"Image\": {\n            \"Width\":  800,\n            \"Height\": 600,\n            \"Title\":  \"View from 15th Floor\",\n            \"Thumbnail\": {\n                \"Url\":    \"http://www.example.com/image/481989943\",\n                \"Height\": 125,\n                \"Width\":  100\n            },\n            \"Animated\" : false,\n            \"IDs\": [116, 943, 234, -38793],\n            \"DeletionDate\": null,\n            \"Distance\": 12.723374634\n        }\n    }]\n    )\";\n\n    // create a SAX event consumer object\n    sax_event_consumer sec;\n\n    // parse JSON\n    bool result = json::sax_parse(text, &sec);\n\n    // output the recorded events\n    for (auto& event : sec.events)\n    {\n        std::cout << event << \"\\n\";\n    }\n\n    // output the result of sax_parse\n    std::cout << \"\\nresult: \" << std::boolalpha << result << std::endl;\n}\n

    Output:

    start_object(elements=18446744073709551615)\nkey(val=Image)\nstart_object(elements=18446744073709551615)\nkey(val=Width)\nnumber_unsigned(val=800)\nkey(val=Height)\nnumber_unsigned(val=600)\nkey(val=Title)\nstring(val=View from 15th Floor)\nkey(val=Thumbnail)\nstart_object(elements=18446744073709551615)\nkey(val=Url)\nstring(val=http://www.example.com/image/481989943)\nkey(val=Height)\nnumber_unsigned(val=125)\nkey(val=Width)\nnumber_unsigned(val=100)\nend_object()\nkey(val=Animated)\nboolean(val=false)\nkey(val=IDs)\nstart_array(elements=18446744073709551615)\nnumber_unsigned(val=116)\nnumber_unsigned(val=943)\nnumber_unsigned(val=234)\nnumber_integer(val=-38793)\nend_array()\nkey(val=DeletionDate)\nnull()\nkey(val=Distance)\nnumber_float(val=12.723375, s=12.723374634)\nend_object()\nend_object()\nparse_error(position=460, last_token=12.723374634<U+000A>        }<U+000A>    }],\n            ex=[json.exception.parse_error.101] parse error at line 17, column 6: syntax error while parsing value - unexpected ']'; expected end of input)\n\nresult: false\n
    "},{"location":"api/json_sax/number_integer/#version-history","title":"Version history","text":"
    • Added in version 3.2.0.
    "},{"location":"api/json_sax/number_unsigned/","title":"nlohmann::json_sax::number_unsigned","text":"
    virtual bool number_unsigned(number_unsigned_t val) = 0;\n

    An unsigned integer number was read.

    "},{"location":"api/json_sax/number_unsigned/#parameters","title":"Parameters","text":"val (in) unsigned integer value"},{"location":"api/json_sax/number_unsigned/#return-value","title":"Return value","text":"

    Whether parsing should proceed.

    "},{"location":"api/json_sax/number_unsigned/#examples","title":"Examples","text":"Example

    The example below shows how the SAX interface is used.

    #include <iostream>\n#include <iomanip>\n#include <sstream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\n// a simple event consumer that collects string representations of the passed\n// values; note inheriting from json::json_sax_t is not required, but can\n// help not to forget a required function\nclass sax_event_consumer : public json::json_sax_t\n{\n  public:\n    std::vector<std::string> events;\n\n    bool null() override\n    {\n        events.push_back(\"null()\");\n        return true;\n    }\n\n    bool boolean(bool val) override\n    {\n        events.push_back(\"boolean(val=\" + std::string(val ? \"true\" : \"false\") + \")\");\n        return true;\n    }\n\n    bool number_integer(number_integer_t val) override\n    {\n        events.push_back(\"number_integer(val=\" + std::to_string(val) + \")\");\n        return true;\n    }\n\n    bool number_unsigned(number_unsigned_t val) override\n    {\n        events.push_back(\"number_unsigned(val=\" + std::to_string(val) + \")\");\n        return true;\n    }\n\n    bool number_float(number_float_t val, const string_t& s) override\n    {\n        events.push_back(\"number_float(val=\" + std::to_string(val) + \", s=\" + s + \")\");\n        return true;\n    }\n\n    bool string(string_t& val) override\n    {\n        events.push_back(\"string(val=\" + val + \")\");\n        return true;\n    }\n\n    bool start_object(std::size_t elements) override\n    {\n        events.push_back(\"start_object(elements=\" + std::to_string(elements) + \")\");\n        return true;\n    }\n\n    bool end_object() override\n    {\n        events.push_back(\"end_object()\");\n        return true;\n    }\n\n    bool start_array(std::size_t elements) override\n    {\n        events.push_back(\"start_array(elements=\" + std::to_string(elements) + \")\");\n        return true;\n    }\n\n    bool end_array() override\n    {\n        events.push_back(\"end_array()\");\n        return true;\n    }\n\n    bool key(string_t& val) override\n    {\n        events.push_back(\"key(val=\" + val + \")\");\n        return true;\n    }\n\n    bool binary(json::binary_t& val) override\n    {\n        events.push_back(\"binary(val=[...])\");\n        return true;\n    }\n\n    bool parse_error(std::size_t position, const std::string& last_token, const json::exception& ex) override\n    {\n        events.push_back(\"parse_error(position=\" + std::to_string(position) + \", last_token=\" + last_token + \",\\n            ex=\" + std::string(ex.what()) + \")\");\n        return false;\n    }\n};\n\nint main()\n{\n    // a JSON text\n    auto text = R\"(\n    {\n        \"Image\": {\n            \"Width\":  800,\n            \"Height\": 600,\n            \"Title\":  \"View from 15th Floor\",\n            \"Thumbnail\": {\n                \"Url\":    \"http://www.example.com/image/481989943\",\n                \"Height\": 125,\n                \"Width\":  100\n            },\n            \"Animated\" : false,\n            \"IDs\": [116, 943, 234, -38793],\n            \"DeletionDate\": null,\n            \"Distance\": 12.723374634\n        }\n    }]\n    )\";\n\n    // create a SAX event consumer object\n    sax_event_consumer sec;\n\n    // parse JSON\n    bool result = json::sax_parse(text, &sec);\n\n    // output the recorded events\n    for (auto& event : sec.events)\n    {\n        std::cout << event << \"\\n\";\n    }\n\n    // output the result of sax_parse\n    std::cout << \"\\nresult: \" << std::boolalpha << result << std::endl;\n}\n

    Output:

    start_object(elements=18446744073709551615)\nkey(val=Image)\nstart_object(elements=18446744073709551615)\nkey(val=Width)\nnumber_unsigned(val=800)\nkey(val=Height)\nnumber_unsigned(val=600)\nkey(val=Title)\nstring(val=View from 15th Floor)\nkey(val=Thumbnail)\nstart_object(elements=18446744073709551615)\nkey(val=Url)\nstring(val=http://www.example.com/image/481989943)\nkey(val=Height)\nnumber_unsigned(val=125)\nkey(val=Width)\nnumber_unsigned(val=100)\nend_object()\nkey(val=Animated)\nboolean(val=false)\nkey(val=IDs)\nstart_array(elements=18446744073709551615)\nnumber_unsigned(val=116)\nnumber_unsigned(val=943)\nnumber_unsigned(val=234)\nnumber_integer(val=-38793)\nend_array()\nkey(val=DeletionDate)\nnull()\nkey(val=Distance)\nnumber_float(val=12.723375, s=12.723374634)\nend_object()\nend_object()\nparse_error(position=460, last_token=12.723374634<U+000A>        }<U+000A>    }],\n            ex=[json.exception.parse_error.101] parse error at line 17, column 6: syntax error while parsing value - unexpected ']'; expected end of input)\n\nresult: false\n
    "},{"location":"api/json_sax/number_unsigned/#version-history","title":"Version history","text":"
    • Added in version 3.2.0.
    "},{"location":"api/json_sax/parse_error/","title":"nlohmann::json_sax::parse_error","text":"
    virtual bool parse_error(std::size_t position,\n                         const std::string& last_token,\n                         const detail::exception& ex) = 0;\n

    A parse error occurred.

    "},{"location":"api/json_sax/parse_error/#parameters","title":"Parameters","text":"position (in) the position in the input where the error occurs last_token (in) the last read token ex (in) an exception object describing the error"},{"location":"api/json_sax/parse_error/#return-value","title":"Return value","text":"

    Whether parsing should proceed (must return false).

    "},{"location":"api/json_sax/parse_error/#examples","title":"Examples","text":"Example

    The example below shows how the SAX interface is used.

    #include <iostream>\n#include <iomanip>\n#include <sstream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\n// a simple event consumer that collects string representations of the passed\n// values; note inheriting from json::json_sax_t is not required, but can\n// help not to forget a required function\nclass sax_event_consumer : public json::json_sax_t\n{\n  public:\n    std::vector<std::string> events;\n\n    bool null() override\n    {\n        events.push_back(\"null()\");\n        return true;\n    }\n\n    bool boolean(bool val) override\n    {\n        events.push_back(\"boolean(val=\" + std::string(val ? \"true\" : \"false\") + \")\");\n        return true;\n    }\n\n    bool number_integer(number_integer_t val) override\n    {\n        events.push_back(\"number_integer(val=\" + std::to_string(val) + \")\");\n        return true;\n    }\n\n    bool number_unsigned(number_unsigned_t val) override\n    {\n        events.push_back(\"number_unsigned(val=\" + std::to_string(val) + \")\");\n        return true;\n    }\n\n    bool number_float(number_float_t val, const string_t& s) override\n    {\n        events.push_back(\"number_float(val=\" + std::to_string(val) + \", s=\" + s + \")\");\n        return true;\n    }\n\n    bool string(string_t& val) override\n    {\n        events.push_back(\"string(val=\" + val + \")\");\n        return true;\n    }\n\n    bool start_object(std::size_t elements) override\n    {\n        events.push_back(\"start_object(elements=\" + std::to_string(elements) + \")\");\n        return true;\n    }\n\n    bool end_object() override\n    {\n        events.push_back(\"end_object()\");\n        return true;\n    }\n\n    bool start_array(std::size_t elements) override\n    {\n        events.push_back(\"start_array(elements=\" + std::to_string(elements) + \")\");\n        return true;\n    }\n\n    bool end_array() override\n    {\n        events.push_back(\"end_array()\");\n        return true;\n    }\n\n    bool key(string_t& val) override\n    {\n        events.push_back(\"key(val=\" + val + \")\");\n        return true;\n    }\n\n    bool binary(json::binary_t& val) override\n    {\n        events.push_back(\"binary(val=[...])\");\n        return true;\n    }\n\n    bool parse_error(std::size_t position, const std::string& last_token, const json::exception& ex) override\n    {\n        events.push_back(\"parse_error(position=\" + std::to_string(position) + \", last_token=\" + last_token + \",\\n            ex=\" + std::string(ex.what()) + \")\");\n        return false;\n    }\n};\n\nint main()\n{\n    // a JSON text\n    auto text = R\"(\n    {\n        \"Image\": {\n            \"Width\":  800,\n            \"Height\": 600,\n            \"Title\":  \"View from 15th Floor\",\n            \"Thumbnail\": {\n                \"Url\":    \"http://www.example.com/image/481989943\",\n                \"Height\": 125,\n                \"Width\":  100\n            },\n            \"Animated\" : false,\n            \"IDs\": [116, 943, 234, -38793],\n            \"DeletionDate\": null,\n            \"Distance\": 12.723374634\n        }\n    }]\n    )\";\n\n    // create a SAX event consumer object\n    sax_event_consumer sec;\n\n    // parse JSON\n    bool result = json::sax_parse(text, &sec);\n\n    // output the recorded events\n    for (auto& event : sec.events)\n    {\n        std::cout << event << \"\\n\";\n    }\n\n    // output the result of sax_parse\n    std::cout << \"\\nresult: \" << std::boolalpha << result << std::endl;\n}\n

    Output:

    start_object(elements=18446744073709551615)\nkey(val=Image)\nstart_object(elements=18446744073709551615)\nkey(val=Width)\nnumber_unsigned(val=800)\nkey(val=Height)\nnumber_unsigned(val=600)\nkey(val=Title)\nstring(val=View from 15th Floor)\nkey(val=Thumbnail)\nstart_object(elements=18446744073709551615)\nkey(val=Url)\nstring(val=http://www.example.com/image/481989943)\nkey(val=Height)\nnumber_unsigned(val=125)\nkey(val=Width)\nnumber_unsigned(val=100)\nend_object()\nkey(val=Animated)\nboolean(val=false)\nkey(val=IDs)\nstart_array(elements=18446744073709551615)\nnumber_unsigned(val=116)\nnumber_unsigned(val=943)\nnumber_unsigned(val=234)\nnumber_integer(val=-38793)\nend_array()\nkey(val=DeletionDate)\nnull()\nkey(val=Distance)\nnumber_float(val=12.723375, s=12.723374634)\nend_object()\nend_object()\nparse_error(position=460, last_token=12.723374634<U+000A>        }<U+000A>    }],\n            ex=[json.exception.parse_error.101] parse error at line 17, column 6: syntax error while parsing value - unexpected ']'; expected end of input)\n\nresult: false\n
    "},{"location":"api/json_sax/parse_error/#version-history","title":"Version history","text":"
    • Added in version 3.2.0.
    "},{"location":"api/json_sax/start_array/","title":"nlohmann::json_sax::start_array","text":"
    virtual bool start_array(std::size_t elements) = 0;\n

    The beginning of an array was read.

    "},{"location":"api/json_sax/start_array/#parameters","title":"Parameters","text":"elements (in) number of object elements or -1 if unknown"},{"location":"api/json_sax/start_array/#return-value","title":"Return value","text":"

    Whether parsing should proceed.

    "},{"location":"api/json_sax/start_array/#notes","title":"Notes","text":"

    Binary formats may report the number of elements.

    "},{"location":"api/json_sax/start_array/#examples","title":"Examples","text":"Example

    The example below shows how the SAX interface is used.

    #include <iostream>\n#include <iomanip>\n#include <sstream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\n// a simple event consumer that collects string representations of the passed\n// values; note inheriting from json::json_sax_t is not required, but can\n// help not to forget a required function\nclass sax_event_consumer : public json::json_sax_t\n{\n  public:\n    std::vector<std::string> events;\n\n    bool null() override\n    {\n        events.push_back(\"null()\");\n        return true;\n    }\n\n    bool boolean(bool val) override\n    {\n        events.push_back(\"boolean(val=\" + std::string(val ? \"true\" : \"false\") + \")\");\n        return true;\n    }\n\n    bool number_integer(number_integer_t val) override\n    {\n        events.push_back(\"number_integer(val=\" + std::to_string(val) + \")\");\n        return true;\n    }\n\n    bool number_unsigned(number_unsigned_t val) override\n    {\n        events.push_back(\"number_unsigned(val=\" + std::to_string(val) + \")\");\n        return true;\n    }\n\n    bool number_float(number_float_t val, const string_t& s) override\n    {\n        events.push_back(\"number_float(val=\" + std::to_string(val) + \", s=\" + s + \")\");\n        return true;\n    }\n\n    bool string(string_t& val) override\n    {\n        events.push_back(\"string(val=\" + val + \")\");\n        return true;\n    }\n\n    bool start_object(std::size_t elements) override\n    {\n        events.push_back(\"start_object(elements=\" + std::to_string(elements) + \")\");\n        return true;\n    }\n\n    bool end_object() override\n    {\n        events.push_back(\"end_object()\");\n        return true;\n    }\n\n    bool start_array(std::size_t elements) override\n    {\n        events.push_back(\"start_array(elements=\" + std::to_string(elements) + \")\");\n        return true;\n    }\n\n    bool end_array() override\n    {\n        events.push_back(\"end_array()\");\n        return true;\n    }\n\n    bool key(string_t& val) override\n    {\n        events.push_back(\"key(val=\" + val + \")\");\n        return true;\n    }\n\n    bool binary(json::binary_t& val) override\n    {\n        events.push_back(\"binary(val=[...])\");\n        return true;\n    }\n\n    bool parse_error(std::size_t position, const std::string& last_token, const json::exception& ex) override\n    {\n        events.push_back(\"parse_error(position=\" + std::to_string(position) + \", last_token=\" + last_token + \",\\n            ex=\" + std::string(ex.what()) + \")\");\n        return false;\n    }\n};\n\nint main()\n{\n    // a JSON text\n    auto text = R\"(\n    {\n        \"Image\": {\n            \"Width\":  800,\n            \"Height\": 600,\n            \"Title\":  \"View from 15th Floor\",\n            \"Thumbnail\": {\n                \"Url\":    \"http://www.example.com/image/481989943\",\n                \"Height\": 125,\n                \"Width\":  100\n            },\n            \"Animated\" : false,\n            \"IDs\": [116, 943, 234, -38793],\n            \"DeletionDate\": null,\n            \"Distance\": 12.723374634\n        }\n    }]\n    )\";\n\n    // create a SAX event consumer object\n    sax_event_consumer sec;\n\n    // parse JSON\n    bool result = json::sax_parse(text, &sec);\n\n    // output the recorded events\n    for (auto& event : sec.events)\n    {\n        std::cout << event << \"\\n\";\n    }\n\n    // output the result of sax_parse\n    std::cout << \"\\nresult: \" << std::boolalpha << result << std::endl;\n}\n

    Output:

    start_object(elements=18446744073709551615)\nkey(val=Image)\nstart_object(elements=18446744073709551615)\nkey(val=Width)\nnumber_unsigned(val=800)\nkey(val=Height)\nnumber_unsigned(val=600)\nkey(val=Title)\nstring(val=View from 15th Floor)\nkey(val=Thumbnail)\nstart_object(elements=18446744073709551615)\nkey(val=Url)\nstring(val=http://www.example.com/image/481989943)\nkey(val=Height)\nnumber_unsigned(val=125)\nkey(val=Width)\nnumber_unsigned(val=100)\nend_object()\nkey(val=Animated)\nboolean(val=false)\nkey(val=IDs)\nstart_array(elements=18446744073709551615)\nnumber_unsigned(val=116)\nnumber_unsigned(val=943)\nnumber_unsigned(val=234)\nnumber_integer(val=-38793)\nend_array()\nkey(val=DeletionDate)\nnull()\nkey(val=Distance)\nnumber_float(val=12.723375, s=12.723374634)\nend_object()\nend_object()\nparse_error(position=460, last_token=12.723374634<U+000A>        }<U+000A>    }],\n            ex=[json.exception.parse_error.101] parse error at line 17, column 6: syntax error while parsing value - unexpected ']'; expected end of input)\n\nresult: false\n
    "},{"location":"api/json_sax/start_array/#version-history","title":"Version history","text":"
    • Added in version 3.2.0.
    "},{"location":"api/json_sax/start_object/","title":"nlohmann::json_sax::start_object","text":"
    virtual bool start_object(std::size_t elements) = 0;\n

    The beginning of an object was read.

    "},{"location":"api/json_sax/start_object/#parameters","title":"Parameters","text":"elements (in) number of object elements or -1 if unknown"},{"location":"api/json_sax/start_object/#return-value","title":"Return value","text":"

    Whether parsing should proceed.

    "},{"location":"api/json_sax/start_object/#notes","title":"Notes","text":"

    Binary formats may report the number of elements.

    "},{"location":"api/json_sax/start_object/#examples","title":"Examples","text":"Example

    The example below shows how the SAX interface is used.

    #include <iostream>\n#include <iomanip>\n#include <sstream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\n// a simple event consumer that collects string representations of the passed\n// values; note inheriting from json::json_sax_t is not required, but can\n// help not to forget a required function\nclass sax_event_consumer : public json::json_sax_t\n{\n  public:\n    std::vector<std::string> events;\n\n    bool null() override\n    {\n        events.push_back(\"null()\");\n        return true;\n    }\n\n    bool boolean(bool val) override\n    {\n        events.push_back(\"boolean(val=\" + std::string(val ? \"true\" : \"false\") + \")\");\n        return true;\n    }\n\n    bool number_integer(number_integer_t val) override\n    {\n        events.push_back(\"number_integer(val=\" + std::to_string(val) + \")\");\n        return true;\n    }\n\n    bool number_unsigned(number_unsigned_t val) override\n    {\n        events.push_back(\"number_unsigned(val=\" + std::to_string(val) + \")\");\n        return true;\n    }\n\n    bool number_float(number_float_t val, const string_t& s) override\n    {\n        events.push_back(\"number_float(val=\" + std::to_string(val) + \", s=\" + s + \")\");\n        return true;\n    }\n\n    bool string(string_t& val) override\n    {\n        events.push_back(\"string(val=\" + val + \")\");\n        return true;\n    }\n\n    bool start_object(std::size_t elements) override\n    {\n        events.push_back(\"start_object(elements=\" + std::to_string(elements) + \")\");\n        return true;\n    }\n\n    bool end_object() override\n    {\n        events.push_back(\"end_object()\");\n        return true;\n    }\n\n    bool start_array(std::size_t elements) override\n    {\n        events.push_back(\"start_array(elements=\" + std::to_string(elements) + \")\");\n        return true;\n    }\n\n    bool end_array() override\n    {\n        events.push_back(\"end_array()\");\n        return true;\n    }\n\n    bool key(string_t& val) override\n    {\n        events.push_back(\"key(val=\" + val + \")\");\n        return true;\n    }\n\n    bool binary(json::binary_t& val) override\n    {\n        events.push_back(\"binary(val=[...])\");\n        return true;\n    }\n\n    bool parse_error(std::size_t position, const std::string& last_token, const json::exception& ex) override\n    {\n        events.push_back(\"parse_error(position=\" + std::to_string(position) + \", last_token=\" + last_token + \",\\n            ex=\" + std::string(ex.what()) + \")\");\n        return false;\n    }\n};\n\nint main()\n{\n    // a JSON text\n    auto text = R\"(\n    {\n        \"Image\": {\n            \"Width\":  800,\n            \"Height\": 600,\n            \"Title\":  \"View from 15th Floor\",\n            \"Thumbnail\": {\n                \"Url\":    \"http://www.example.com/image/481989943\",\n                \"Height\": 125,\n                \"Width\":  100\n            },\n            \"Animated\" : false,\n            \"IDs\": [116, 943, 234, -38793],\n            \"DeletionDate\": null,\n            \"Distance\": 12.723374634\n        }\n    }]\n    )\";\n\n    // create a SAX event consumer object\n    sax_event_consumer sec;\n\n    // parse JSON\n    bool result = json::sax_parse(text, &sec);\n\n    // output the recorded events\n    for (auto& event : sec.events)\n    {\n        std::cout << event << \"\\n\";\n    }\n\n    // output the result of sax_parse\n    std::cout << \"\\nresult: \" << std::boolalpha << result << std::endl;\n}\n

    Output:

    start_object(elements=18446744073709551615)\nkey(val=Image)\nstart_object(elements=18446744073709551615)\nkey(val=Width)\nnumber_unsigned(val=800)\nkey(val=Height)\nnumber_unsigned(val=600)\nkey(val=Title)\nstring(val=View from 15th Floor)\nkey(val=Thumbnail)\nstart_object(elements=18446744073709551615)\nkey(val=Url)\nstring(val=http://www.example.com/image/481989943)\nkey(val=Height)\nnumber_unsigned(val=125)\nkey(val=Width)\nnumber_unsigned(val=100)\nend_object()\nkey(val=Animated)\nboolean(val=false)\nkey(val=IDs)\nstart_array(elements=18446744073709551615)\nnumber_unsigned(val=116)\nnumber_unsigned(val=943)\nnumber_unsigned(val=234)\nnumber_integer(val=-38793)\nend_array()\nkey(val=DeletionDate)\nnull()\nkey(val=Distance)\nnumber_float(val=12.723375, s=12.723374634)\nend_object()\nend_object()\nparse_error(position=460, last_token=12.723374634<U+000A>        }<U+000A>    }],\n            ex=[json.exception.parse_error.101] parse error at line 17, column 6: syntax error while parsing value - unexpected ']'; expected end of input)\n\nresult: false\n
    "},{"location":"api/json_sax/start_object/#version-history","title":"Version history","text":"
    • Added in version 3.2.0.
    "},{"location":"api/json_sax/string/","title":"nlohmann::json_sax::string","text":"
    virtual bool string(string_t& val) = 0;\n

    A string value was read.

    "},{"location":"api/json_sax/string/#parameters","title":"Parameters","text":"val (in) string value"},{"location":"api/json_sax/string/#return-value","title":"Return value","text":"

    Whether parsing should proceed.

    "},{"location":"api/json_sax/string/#notes","title":"Notes","text":"

    It is safe to move the passed string value.

    "},{"location":"api/json_sax/string/#examples","title":"Examples","text":"Example

    The example below shows how the SAX interface is used.

    #include <iostream>\n#include <iomanip>\n#include <sstream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\n// a simple event consumer that collects string representations of the passed\n// values; note inheriting from json::json_sax_t is not required, but can\n// help not to forget a required function\nclass sax_event_consumer : public json::json_sax_t\n{\n  public:\n    std::vector<std::string> events;\n\n    bool null() override\n    {\n        events.push_back(\"null()\");\n        return true;\n    }\n\n    bool boolean(bool val) override\n    {\n        events.push_back(\"boolean(val=\" + std::string(val ? \"true\" : \"false\") + \")\");\n        return true;\n    }\n\n    bool number_integer(number_integer_t val) override\n    {\n        events.push_back(\"number_integer(val=\" + std::to_string(val) + \")\");\n        return true;\n    }\n\n    bool number_unsigned(number_unsigned_t val) override\n    {\n        events.push_back(\"number_unsigned(val=\" + std::to_string(val) + \")\");\n        return true;\n    }\n\n    bool number_float(number_float_t val, const string_t& s) override\n    {\n        events.push_back(\"number_float(val=\" + std::to_string(val) + \", s=\" + s + \")\");\n        return true;\n    }\n\n    bool string(string_t& val) override\n    {\n        events.push_back(\"string(val=\" + val + \")\");\n        return true;\n    }\n\n    bool start_object(std::size_t elements) override\n    {\n        events.push_back(\"start_object(elements=\" + std::to_string(elements) + \")\");\n        return true;\n    }\n\n    bool end_object() override\n    {\n        events.push_back(\"end_object()\");\n        return true;\n    }\n\n    bool start_array(std::size_t elements) override\n    {\n        events.push_back(\"start_array(elements=\" + std::to_string(elements) + \")\");\n        return true;\n    }\n\n    bool end_array() override\n    {\n        events.push_back(\"end_array()\");\n        return true;\n    }\n\n    bool key(string_t& val) override\n    {\n        events.push_back(\"key(val=\" + val + \")\");\n        return true;\n    }\n\n    bool binary(json::binary_t& val) override\n    {\n        events.push_back(\"binary(val=[...])\");\n        return true;\n    }\n\n    bool parse_error(std::size_t position, const std::string& last_token, const json::exception& ex) override\n    {\n        events.push_back(\"parse_error(position=\" + std::to_string(position) + \", last_token=\" + last_token + \",\\n            ex=\" + std::string(ex.what()) + \")\");\n        return false;\n    }\n};\n\nint main()\n{\n    // a JSON text\n    auto text = R\"(\n    {\n        \"Image\": {\n            \"Width\":  800,\n            \"Height\": 600,\n            \"Title\":  \"View from 15th Floor\",\n            \"Thumbnail\": {\n                \"Url\":    \"http://www.example.com/image/481989943\",\n                \"Height\": 125,\n                \"Width\":  100\n            },\n            \"Animated\" : false,\n            \"IDs\": [116, 943, 234, -38793],\n            \"DeletionDate\": null,\n            \"Distance\": 12.723374634\n        }\n    }]\n    )\";\n\n    // create a SAX event consumer object\n    sax_event_consumer sec;\n\n    // parse JSON\n    bool result = json::sax_parse(text, &sec);\n\n    // output the recorded events\n    for (auto& event : sec.events)\n    {\n        std::cout << event << \"\\n\";\n    }\n\n    // output the result of sax_parse\n    std::cout << \"\\nresult: \" << std::boolalpha << result << std::endl;\n}\n

    Output:

    start_object(elements=18446744073709551615)\nkey(val=Image)\nstart_object(elements=18446744073709551615)\nkey(val=Width)\nnumber_unsigned(val=800)\nkey(val=Height)\nnumber_unsigned(val=600)\nkey(val=Title)\nstring(val=View from 15th Floor)\nkey(val=Thumbnail)\nstart_object(elements=18446744073709551615)\nkey(val=Url)\nstring(val=http://www.example.com/image/481989943)\nkey(val=Height)\nnumber_unsigned(val=125)\nkey(val=Width)\nnumber_unsigned(val=100)\nend_object()\nkey(val=Animated)\nboolean(val=false)\nkey(val=IDs)\nstart_array(elements=18446744073709551615)\nnumber_unsigned(val=116)\nnumber_unsigned(val=943)\nnumber_unsigned(val=234)\nnumber_integer(val=-38793)\nend_array()\nkey(val=DeletionDate)\nnull()\nkey(val=Distance)\nnumber_float(val=12.723375, s=12.723374634)\nend_object()\nend_object()\nparse_error(position=460, last_token=12.723374634<U+000A>        }<U+000A>    }],\n            ex=[json.exception.parse_error.101] parse error at line 17, column 6: syntax error while parsing value - unexpected ']'; expected end of input)\n\nresult: false\n
    "},{"location":"api/json_sax/string/#version-history","title":"Version history","text":"
    • Added in version 3.2.0.
    "},{"location":"api/macros/","title":"Macros","text":"

    Some aspects of the library can be configured by defining preprocessor macros before including the json.hpp header. See also the macro overview page.

    "},{"location":"api/macros/#runtime-assertions","title":"Runtime assertions","text":"
    • JSON_ASSERT(x) - control behavior of runtime assertions
    "},{"location":"api/macros/#exceptions","title":"Exceptions","text":"
    • JSON_CATCH_USER(exception)JSON_THROW_USER(exception)JSON_TRY_USER - control exceptions
    • JSON_DIAGNOSTICS - control extended diagnostics
    • JSON_DIAGNOSTIC_POSITIONS - access positions of elements
    • JSON_NOEXCEPTION - switch off exceptions
    "},{"location":"api/macros/#language-support","title":"Language support","text":"
    • JSON_HAS_CPP_11JSON_HAS_CPP_14JSON_HAS_CPP_17JSON_HAS_CPP_20 - set supported C++ standard
    • JSON_HAS_FILESYSTEMJSON_HAS_EXPERIMENTAL_FILESYSTEM - control std::filesystem support
    • JSON_HAS_RANGES - control std::ranges support
    • JSON_HAS_THREE_WAY_COMPARISON - control 3-way comparison support
    • JSON_NO_IO - switch off functions relying on certain C++ I/O headers
    • JSON_SKIP_UNSUPPORTED_COMPILER_CHECK - do not warn about unsupported compilers
    • JSON_USE_GLOBAL_UDLS - place user-defined string literals (UDLs) into the global namespace
    "},{"location":"api/macros/#library-version","title":"Library version","text":"
    • JSON_SKIP_LIBRARY_VERSION_CHECK - skip library version check
    • NLOHMANN_JSON_VERSION_MAJORNLOHMANN_JSON_VERSION_MINORNLOHMANN_JSON_VERSION_PATCH - library version information
    "},{"location":"api/macros/#library-namespace","title":"Library namespace","text":"
    • NLOHMANN_JSON_NAMESPACE - full name of the nlohmann namespace
    • NLOHMANN_JSON_NAMESPACE_BEGINNLOHMANN_JSON_NAMESPACE_END - open and close the library namespace
    • NLOHMANN_JSON_NAMESPACE_NO_VERSION - disable the version component of the inline namespace
    "},{"location":"api/macros/#type-conversions","title":"Type conversions","text":"
    • JSON_DISABLE_ENUM_SERIALIZATION - switch off default serialization/deserialization functions for enums
    • JSON_USE_IMPLICIT_CONVERSIONS - control implicit conversions
    "},{"location":"api/macros/#comparison-behavior","title":"Comparison behavior","text":"
    • JSON_USE_LEGACY_DISCARDED_VALUE_COMPARISON - control comparison of discarded values
    "},{"location":"api/macros/#serializationdeserialization-macros","title":"Serialization/deserialization macros","text":""},{"location":"api/macros/#enums","title":"Enums","text":"
    • NLOHMANN_JSON_SERIALIZE_ENUM - serialize/deserialize an enum
    "},{"location":"api/macros/#classes-and-structs","title":"Classes and structs","text":"
    • NLOHMANN_DEFINE_TYPE_INTRUSIVE - serialize/deserialize a non-derived class with private members
    • NLOHMANN_DEFINE_TYPE_INTRUSIVE_WITH_DEFAULT - serialize/deserialize a non-derived class with private members; uses default values
    • NLOHMANN_DEFINE_TYPE_INTRUSIVE_ONLY_SERIALIZE - serialize a non-derived class with private members
    • NLOHMANN_DEFINE_TYPE_NON_INTRUSIVE - serialize/deserialize a non-derived class
    • NLOHMANN_DEFINE_TYPE_NON_INTRUSIVE_WITH_DEFAULT - serialize/deserialize a non-derived class; uses default values

    • NLOHMANN_DEFINE_TYPE_NON_INTRUSIVE_ONLY_SERIALIZE - serialize a non-derived class

    • NLOHMANN_DEFINE_DERIVED_TYPE_INTRUSIVE - serialize/deserialize a derived class with private members

    • NLOHMANN_DEFINE_DERIVED_TYPE_INTRUSIVE_WITH_DEFAULT - serialize/deserialize a derived class with private members; uses default values
    • NLOHMANN_DEFINE_DERIVED_TYPE_INTRUSIVE_ONLY_SERIALIZE - serialize a derived class with private members
    • NLOHMANN_DEFINE_DERIVED_TYPE_NON_INTRUSIVE - serialize/deserialize a derived class
    • NLOHMANN_DEFINE_DERIVED_TYPE_NON_INTRUSIVE_WITH_DEFAULT - serialize/deserialize a derived class; uses default values
    • NLOHMANN_DEFINE_DERIVED_TYPE_NON_INTRUSIVE_ONLY_SERIALIZE - serialize a derived class
    "},{"location":"api/macros/json_assert/","title":"JSON_ASSERT","text":"
    #define JSON_ASSERT(x) /* value */\n

    This macro controls which code is executed for runtime assertions of the library.

    "},{"location":"api/macros/json_assert/#parameters","title":"Parameters","text":"x (in) expression of a scalar type"},{"location":"api/macros/json_assert/#default-definition","title":"Default definition","text":"

    The default value is assert(x).

    #define JSON_ASSERT(x) assert(x)\n

    Therefore, assertions can be switched off by defining NDEBUG.

    "},{"location":"api/macros/json_assert/#notes","title":"Notes","text":"
    • The library uses numerous assertions to guarantee invariants and to abort in case of otherwise undefined behavior (e.g., when calling operator[] with a missing object key on a const object). See page runtime assertions for more information.
    • Defining the macro to code that does not call std::abort may leave the library in an undefined state.
    • The macro is undefined outside the library.
    "},{"location":"api/macros/json_assert/#examples","title":"Examples","text":"Example 1: default behavior

    The following code will trigger an assertion at runtime:

    #include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    const json j = {{\"key\", \"value\"}};\n    auto v = j[\"missing\"];\n}\n

    Output:

    Assertion failed: (m_value.object->find(key) != m_value.object->end()), function operator[], file json.hpp, line 2144.\n
    Example 2: user-defined behavior

    The assertion reporting can be changed by defining JSON_ASSERT(x) differently.

    #include <cstdio>\n#include <cstdlib>\n#define JSON_ASSERT(x) if(!(x)){fprintf(stderr, \"assertion error in %s\\n\", __FUNCTION__); std::abort();}\n\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    const json j = {{\"key\", \"value\"}};\n    auto v = j[\"missing\"];\n}\n

    Output:

    assertion error in operator[]\n
    "},{"location":"api/macros/json_assert/#see-also","title":"See also","text":"
    • Runtime Assertions - overview documentation
    "},{"location":"api/macros/json_assert/#version-history","title":"Version history","text":"
    • Added in version 3.9.0.
    "},{"location":"api/macros/json_diagnostic_positions/","title":"JSON_DIAGNOSTIC_POSITIONS","text":"
    #define JSON_DIAGNOSTIC_POSITIONS /* value */\n

    This macro enables position diagnostics for generated JSON objects.

    When enabled, two new member functions start_pos() and end_pos() are added to basic_json values. If the value was created by calling theparse function, then these functions allow querying the byte positions of the value in the input it was parsed from. In case the value was constructed by other means, std::string::npos is returned.

    start_pos() returns the position of the first character of a given value in the original JSON string, while end_pos() returns the position of the character following the last character. For objects and arrays, the first and last characters correspond to the opening or closing braces/brackets, respectively. For primitive values, the first and last character represents the opening and closing quotes (strings) or the first and last character of the field's numerical or predefined value (true, false, null), respectively.

    JSON type return value start_pos() return value end_pos() object position of the opening { position after the closing } array position of the opening [ position after the closing ] string position of the opening \" position after the closing \" number position of the first character position after the last character boolean position of t for true and f for false position after e null position of n position after l

    Given the above, end_pos()-start_pos() for a JSON value provides the length of the parsed JSON string for that value, including the opening or closing braces, brackets, or quotes.

    Note that enabling this macro increases the size of every JSON value by two std::size_t fields and adds slight runtime overhead to parsing, copying JSON value objects, and the generation of error messages for exceptions. It also causes these values to be reported in those error messages.

    "},{"location":"api/macros/json_diagnostic_positions/#default-definition","title":"Default definition","text":"

    The default value is 0 (position diagnostics are switched off).

    #define JSON_DIAGNOSTIC_POSITIONS 0\n

    When the macro is not defined, the library will define it to its default value.

    "},{"location":"api/macros/json_diagnostic_positions/#notes","title":"Notes","text":"

    CMake option

    Diagnostic positions can also be controlled with the CMake option JSON_Diagnostic_Positions (OFF by default) which defines JSON_DIAGNOSTIC_POSITIONS accordingly.

    Availability

    Diagnostic positions are only available if the value was created by the parse function. The sax_parse function or all other means to create a JSON value do not set the diagnostic positions and start_pos() and end_pos() will only return std::string::npos for these values.

    Invalidation

    The returned positions are only valid as long as the JSON value is not changed. The positions are not updated when the JSON value is changed.

    "},{"location":"api/macros/json_diagnostic_positions/#examples","title":"Examples","text":"Example: retrieving positions 
    #include <iostream>\n\n#define JSON_DIAGNOSTIC_POSITIONS 1\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    std::string json_string = R\"(\n    {\n        \"address\": {\n            \"street\": \"Fake Street\",\n            \"housenumber\": 1\n        }\n    }\n    )\";\n    json j = json::parse(json_string);\n\n    std::cout << \"Root diagnostic positions: \\n\";\n    std::cout << \"\\tstart_pos: \" << j.start_pos() << '\\n';\n    std::cout << \"\\tend_pos:\" << j.end_pos() << \"\\n\";\n    std::cout << \"Original string: \\n\";\n    std::cout << \"{\\n        \\\"address\\\": {\\n            \\\"street\\\": \\\"Fake Street\\\",\\n            \\\"housenumber\\\": 1\\n        }\\n    }\" << \"\\n\";\n    std::cout << \"Parsed string: \\n\";\n    std::cout << json_string.substr(j.start_pos(), j.end_pos() - j.start_pos()) << \"\\n\\n\";\n\n    std::cout << \"address diagnostic positions: \\n\";\n    std::cout << \"\\tstart_pos:\" << j[\"address\"].start_pos() << '\\n';\n    std::cout << \"\\tend_pos:\" << j[\"address\"].end_pos() << \"\\n\\n\";\n    std::cout << \"Original string: \\n\";\n    std::cout << \"{            \\\"street\\\": \\\"Fake Street\\\",\\n            \\\"housenumber\\\": 1\\n        }\" << \"\\n\";\n    std::cout << \"Parsed string: \\n\";\n    std::cout << json_string.substr(j[\"address\"].start_pos(), j[\"address\"].end_pos() - j[\"address\"].start_pos()) << \"\\n\\n\";\n\n    std::cout << \"street diagnostic positions: \\n\";\n    std::cout << \"\\tstart_pos:\" << j[\"address\"][\"street\"].start_pos() << '\\n';\n    std::cout << \"\\tend_pos:\" << j[\"address\"][\"street\"].end_pos() << \"\\n\\n\";\n    std::cout << \"Original string: \\n\";\n    std::cout << \"\\\"Fake Street\\\"\" << \"\\n\";\n    std::cout << \"Parsed string: \\n\";\n    std::cout << json_string.substr(j[\"address\"][\"street\"].start_pos(), j[\"address\"][\"street\"].end_pos() - j[\"address\"][\"street\"].start_pos()) << \"\\n\\n\";\n\n    std::cout << \"housenumber diagnostic positions: \\n\";\n    std::cout << \"\\tstart_pos:\" << j[\"address\"][\"housenumber\"].start_pos() << '\\n';\n    std::cout << \"\\tend_pos:\" << j[\"address\"][\"housenumber\"].end_pos() << \"\\n\\n\";\n    std::cout << \"Original string: \\n\";\n    std::cout << \"1\" << \"\\n\";\n    std::cout << \"Parsed string: \\n\";\n    std::cout << json_string.substr(j[\"address\"][\"housenumber\"].start_pos(), j[\"address\"][\"housenumber\"].end_pos() - j[\"address\"][\"housenumber\"].start_pos()) << \"\\n\\n\";\n}\n

    Output:

    Root diagnostic positions: \n    start_pos: 5\n    end_pos:109\nOriginal string: \n{\n        \"address\": {\n            \"street\": \"Fake Street\",\n            \"housenumber\": 1\n        }\n    }\nParsed string: \n{\n        \"address\": {\n            \"street\": \"Fake Street\",\n            \"housenumber\": 1\n        }\n    }\n\naddress diagnostic positions: \n    start_pos:26\n    end_pos:103\n\nOriginal string: \n{            \"street\": \"Fake Street\",\n            \"housenumber\": 1\n        }\nParsed string: \n{\n            \"street\": \"Fake Street\",\n            \"housenumber\": 1\n        }\n\nstreet diagnostic positions: \n    start_pos:50\n    end_pos:63\n\nOriginal string: \n\"Fake Street\"\nParsed string: \n\"Fake Street\"\n\nhousenumber diagnostic positions: \n    start_pos:92\n    end_pos:93\n\nOriginal string: \n1\nParsed string: \n1\n

    The output shows the start/end positions of all the objects and fields in the JSON string.

    Example 2: using only diagnostic positions in exceptions 
    #include <iostream>\n\n#define JSON_DIAGNOSTIC_POSITIONS 1\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\n/* Demonstration of type error exception with diagnostic postions support enabled */\nint main()\n{\n    //Invalid json string - housenumber type must be int instead of string\n    const std::string json_invalid_string = R\"(\n    {\n        \"address\": {\n            \"street\": \"Fake Street\",\n            \"housenumber\": \"1\"\n        }\n    }\n    )\";\n    json j = json::parse(json_invalid_string);\n    try\n    {\n        int housenumber = j[\"address\"][\"housenumber\"];\n        std::cout << housenumber;\n    }\n    catch (const json::exception& e)\n    {\n        std::cout << e.what() << '\\n';\n    }\n}\n

    Output:

    [json.exception.type_error.302] (bytes 92-95) type must be number, but is string\n
    The output shows the exception with start/end positions only.\n
    Example 3: using extended diagnostics with positions enabled in exceptions 
    #include <iostream>\n\n#define JSON_DIAGNOSTICS 1\n#define JSON_DIAGNOSTIC_POSITIONS 1\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\n/* Demonstration of type error exception with diagnostic postions support enabled */\nint main()\n{\n    //Invalid json string - housenumber type must be int instead of string\n    const std::string json_invalid_string = R\"(\n    {\n        \"address\": {\n            \"street\": \"Fake Street\",\n            \"housenumber\": \"1\"\n        }\n    }\n    )\";\n    json j = json::parse(json_invalid_string);\n    try\n    {\n        int housenumber = j[\"address\"][\"housenumber\"];\n        std::cout << housenumber;\n    }\n    catch (const json::exception& e)\n    {\n        std::cout << e.what() << '\\n';\n    }\n}\n

    Output:

    [json.exception.type_error.302] (/address/housenumber) (bytes 92-95) type must be number, but is string\n
    The output shows the exception with diagnostic path info and start/end positions.\n
    "},{"location":"api/macros/json_diagnostic_positions/#see-also","title":"See also","text":"
    • JSON_Diagnostic_Positions - CMake option to control the macro
    • JSON_DIAGNOSTICS - macro to control extended diagnostics
    "},{"location":"api/macros/json_diagnostic_positions/#version-history","title":"Version history","text":"
    • Added in version 3.12.0.
    "},{"location":"api/macros/json_diagnostics/","title":"JSON_DIAGNOSTICS","text":"
    #define JSON_DIAGNOSTICS /* value */\n

    This macro enables extended diagnostics for exception messages. Possible values are 1 to enable or 0 to disable (default).

    When enabled, exception messages contain a JSON Pointer to the JSON value that triggered the exception. Note that enabling this macro increases the size of every JSON value by one pointer and adds some runtime overhead.

    "},{"location":"api/macros/json_diagnostics/#default-definition","title":"Default definition","text":"

    The default value is 0 (extended diagnostics are switched off).

    #define JSON_DIAGNOSTICS 0\n

    When the macro is not defined, the library will define it to its default value.

    "},{"location":"api/macros/json_diagnostics/#notes","title":"Notes","text":"

    ABI compatibility

    As of version 3.11.0, this macro is no longer required to be defined consistently throughout a codebase to avoid One Definition Rule (ODR) violations, as the value of this macro is encoded in the namespace, resulting in distinct symbol names.

    This allows different parts of a codebase to use different versions or configurations of this library without causing improper behavior.

    Where possible, it is still recommended that all code define this the same way for maximum interoperability.

    CMake option

    Diagnostic messages can also be controlled with the CMake option JSON_Diagnostics (OFF by default) which defines JSON_DIAGNOSTICS accordingly.

    "},{"location":"api/macros/json_diagnostics/#examples","title":"Examples","text":"Example 1: default behavior 
    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    json j;\n    j[\"address\"][\"street\"] = \"Fake Street\";\n    j[\"address\"][\"housenumber\"] = \"12\";\n\n    try\n    {\n        int housenumber = j[\"address\"][\"housenumber\"];\n    }\n    catch (const json::exception& e)\n    {\n        std::cout << e.what() << '\\n';\n    }\n}\n

    Output:

    [json.exception.type_error.302] type must be number, but is string\n

    This exception can be hard to debug if storing the value \"12\" and accessing it is further apart.

    Example 2: extended diagnostic messages 
    #include <iostream>\n\n# define JSON_DIAGNOSTICS 1\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    json j;\n    j[\"address\"][\"street\"] = \"Fake Street\";\n    j[\"address\"][\"housenumber\"] = \"12\";\n\n    try\n    {\n        int housenumber = j[\"address\"][\"housenumber\"];\n    }\n    catch (const json::exception& e)\n    {\n        std::cout << e.what() << '\\n';\n    }\n}\n

    Output:

    [json.exception.type_error.302] (/address/housenumber) type must be number, but is string\n

    Now the exception message contains a JSON Pointer /address/housenumber that indicates which value has the wrong type.

    Example 3: using only diagnostic positions in exceptions 
    #include <iostream>\n\n#define JSON_DIAGNOSTIC_POSITIONS 1\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\n/* Demonstration of type error exception with diagnostic postions support enabled */\nint main()\n{\n    //Invalid json string - housenumber type must be int instead of string\n    const std::string json_invalid_string = R\"(\n    {\n        \"address\": {\n            \"street\": \"Fake Street\",\n            \"housenumber\": \"1\"\n        }\n    }\n    )\";\n    json j = json::parse(json_invalid_string);\n    try\n    {\n        int housenumber = j[\"address\"][\"housenumber\"];\n        std::cout << housenumber;\n    }\n    catch (const json::exception& e)\n    {\n        std::cout << e.what() << '\\n';\n    }\n}\n

    Output:

    [json.exception.type_error.302] (bytes 92-95) type must be number, but is string\n
    The output shows the exception with start/end positions only.

    "},{"location":"api/macros/json_diagnostics/#see-also","title":"See also","text":"
    • JSON_Diagnostics - CMake option to control the macro
    • JSON_DIAGNOSTIC_POSITIONS - macro to access positions of elements
    "},{"location":"api/macros/json_diagnostics/#version-history","title":"Version history","text":"
    • Added in version 3.10.0.
    • As of version 3.11.0, the definition is allowed to vary between translation units.
    "},{"location":"api/macros/json_disable_enum_serialization/","title":"JSON_DISABLE_ENUM_SERIALIZATION","text":"
    #define JSON_DISABLE_ENUM_SERIALIZATION /* value */\n

    When defined to 1, default serialization and deserialization functions for enums are excluded and have to be provided by the user, for example, using NLOHMANN_JSON_SERIALIZE_ENUM (see arbitrary type conversions for more details).

    Parsing or serializing an enum will result in a compiler error.

    This works for both unscoped and scoped enums.

    "},{"location":"api/macros/json_disable_enum_serialization/#default-definition","title":"Default definition","text":"

    The default value is 0.

    #define JSON_DISABLE_ENUM_SERIALIZATION 0\n
    "},{"location":"api/macros/json_disable_enum_serialization/#notes","title":"Notes","text":"

    CMake option

    Enum serialization can also be controlled with the CMake option JSON_DisableEnumSerialization (OFF by default) which defines JSON_DISABLE_ENUM_SERIALIZATION accordingly.

    "},{"location":"api/macros/json_disable_enum_serialization/#examples","title":"Examples","text":"Example 1: Disabled behavior

    The code below forces the library not to create default serialization/deserialization functions from_json and to_json, meaning the code below does not compile.

    #define JSON_DISABLE_ENUM_SERIALIZATION 1\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nenum class Choice\n{\n    first,\n    second,\n};\n\nint main()\n{\n    // normally invokes to_json serialization function but with JSON_DISABLE_ENUM_SERIALIZATION defined, it does not\n    const json j = Choice::first; \n\n    // normally invokes from_json parse function but with JSON_DISABLE_ENUM_SERIALIZATION defined, it does not\n    Choice ch = j.template get<Choice>();\n}\n
    Example 2: Serialize enum macro

    The code below forces the library not to create default serialization/deserialization functions from_json and to_json, but uses NLOHMANN_JSON_SERIALIZE_ENUM to parse and serialize the enum.

    #define JSON_DISABLE_ENUM_SERIALIZATION 1\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nenum class Choice\n{\n    first,\n    second,\n};\n\nNLOHMANN_JSON_SERIALIZE_ENUM(Choice,\n{\n    { Choice::first, \"first\" },\n    { Choice::second, \"second\" },\n})\n\nint main()\n{\n    // uses user-defined to_json function defined by macro\n    const json j = Choice::first; \n\n    // uses user-defined from_json function defined by macro\n    Choice ch = j.template get<Choice>();\n}\n
    Example 3: User-defined serialization/deserialization functions

    The code below forces the library not to create default serialization/deserialization functions from_json and to_json, but uses user-defined functions to parse and serialize the enum.

    #define JSON_DISABLE_ENUM_SERIALIZATION 1\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nenum class Choice\n{\n    first,\n    second,\n};\n\nvoid from_json(const json& j, Choice& ch)\n{\n    auto value = j.template get<std::string>();\n    if (value == \"first\")\n    {\n        ch = Choice::first;\n    }\n    else if (value == \"second\")\n    {\n        ch = Choice::second;\n    }\n}\n\nvoid to_json(json& j, const Choice& ch)\n{\n    auto value = j.template get<std::string>();\n    if (value == \"first\")\n    {\n        ch = Choice::first;\n    }\n    else if (value == \"second\")\n    {\n        ch = Choice::second;\n    }\n}\n\nint main()\n{\n    // uses user-defined to_json function\n    const json j = Choice::first; \n\n    // uses user-defined from_json function\n    Choice ch = j.template get<Choice>();\n}\n
    "},{"location":"api/macros/json_disable_enum_serialization/#see-also","title":"See also","text":"
    • JSON_DisableEnumSerialization - CMake option to control the macro
    • NLOHMANN_JSON_SERIALIZE_ENUM - serialize/deserialize an enum
    "},{"location":"api/macros/json_disable_enum_serialization/#version-history","title":"Version history","text":"
    • Added in version 3.11.0.
    "},{"location":"api/macros/json_has_cpp_11/","title":"JSON_HAS_CPP_11, JSON_HAS_CPP_14, JSON_HAS_CPP_17, JSON_HAS_CPP_20","text":"
    #define JSON_HAS_CPP_11\n#define JSON_HAS_CPP_14\n#define JSON_HAS_CPP_17\n#define JSON_HAS_CPP_20\n

    The library targets C++11, but also supports some features introduced in later C++ versions (e.g., std::string_view support for C++17). For these new features, the library implements some preprocessor checks to determine the C++ standard. By defining any of these symbols, the internal check is overridden and the provided C++ version is unconditionally assumed. This can be helpful for compilers that only implement parts of the standard and would be detected incorrectly.

    "},{"location":"api/macros/json_has_cpp_11/#default-definition","title":"Default definition","text":"

    The default value is detected based on preprocessor macros such as __cplusplus, _HAS_CXX17, or _MSVC_LANG.

    "},{"location":"api/macros/json_has_cpp_11/#notes","title":"Notes","text":"
    • JSON_HAS_CPP_11 is always defined.
    • All macros are undefined outside the library.
    "},{"location":"api/macros/json_has_cpp_11/#examples","title":"Examples","text":"Example

    The code below forces the library to use the C++14 standard:

    #define JSON_HAS_CPP_14 1\n#include <nlohmann/json.hpp>\n\n...\n
    "},{"location":"api/macros/json_has_cpp_11/#version-history","title":"Version history","text":"
    • Added in version 3.10.5.
    "},{"location":"api/macros/json_has_filesystem/","title":"JSON_HAS_FILESYSTEM / JSON_HAS_EXPERIMENTAL_FILESYSTEM","text":"
    #define JSON_HAS_FILESYSTEM /* value */\n#define JSON_HAS_EXPERIMENTAL_FILESYSTEM /* value */\n

    When compiling with C++17, the library provides conversions from and to std::filesystem::path. As compiler support for filesystem is limited, the library tries to detect whether <filesystem>/std::filesystem (JSON_HAS_FILESYSTEM) or <experimental/filesystem>/std::experimental::filesystem (JSON_HAS_EXPERIMENTAL_FILESYSTEM) should be used. To override the built-in check, define JSON_HAS_FILESYSTEM or JSON_HAS_EXPERIMENTAL_FILESYSTEM to 1.

    "},{"location":"api/macros/json_has_filesystem/#default-definition","title":"Default definition","text":"

    The default value is detected based on the preprocessor macros __cpp_lib_filesystem, __cpp_lib_experimental_filesystem, __has_include(<filesystem>), or __has_include(<experimental/filesystem>).

    "},{"location":"api/macros/json_has_filesystem/#notes","title":"Notes","text":"
    • Note that older compilers or older versions of libstd++ also require the library stdc++fs to be linked to for filesystem support.
    • Both macros are undefined outside the library.
    "},{"location":"api/macros/json_has_filesystem/#examples","title":"Examples","text":"Example

    The code below forces the library to use the header <experimental/filesystem>.

    #define JSON_HAS_EXPERIMENTAL_FILESYSTEM 1\n#include <nlohmann/json.hpp>\n\n...\n
    "},{"location":"api/macros/json_has_filesystem/#version-history","title":"Version history","text":"
    • Added in version 3.10.5.
    "},{"location":"api/macros/json_has_ranges/","title":"JSON_HAS_RANGES","text":"
    #define JSON_HAS_RANGES /* value */\n

    This macro indicates whether the standard library has any support for ranges. Implies support for concepts. Possible values are 1 when supported or 0 when unsupported.

    "},{"location":"api/macros/json_has_ranges/#default-definition","title":"Default definition","text":"

    The default value is detected based on the preprocessor macro __cpp_lib_ranges.

    When the macro is not defined, the library will define it to its default value.

    "},{"location":"api/macros/json_has_ranges/#examples","title":"Examples","text":"Example

    The code below forces the library to enable support for ranges:

    #define JSON_HAS_RANGES 1\n#include <nlohmann/json.hpp>\n\n...\n
    "},{"location":"api/macros/json_has_ranges/#version-history","title":"Version history","text":"
    • Added in version 3.11.0.
    "},{"location":"api/macros/json_has_static_rtti/","title":"JSON_HAS_STATIC_RTTI","text":"
    #define JSON_HAS_STATIC_RTTI /* value */\n

    This macro indicates whether the standard library has any support for RTTI (run time type information). Possible values are 1 when supported or 0 when unsupported.

    "},{"location":"api/macros/json_has_static_rtti/#default-definition","title":"Default definition","text":"

    The default value is detected based on the preprocessor macro _HAS_STATIC_RTTI.

    When the macro is not defined, the library will define it to its default value.

    "},{"location":"api/macros/json_has_static_rtti/#examples","title":"Examples","text":"Example

    The code below forces the library to enable support for libraries with RTTI dependence:

    #define JSON_HAS_STATIC_RTTI 1\n#include <nlohmann/json.hpp>\n\n...\n
    "},{"location":"api/macros/json_has_static_rtti/#version-history","title":"Version history","text":"
    • Added in version 3.11.3.
    "},{"location":"api/macros/json_has_three_way_comparison/","title":"JSON_HAS_THREE_WAY_COMPARISON","text":"
    #define JSON_HAS_THREE_WAY_COMPARISON /* value */\n

    This macro indicates whether the compiler and standard library support 3-way comparison. Possible values are 1 when supported or 0 when unsupported.

    "},{"location":"api/macros/json_has_three_way_comparison/#default-definition","title":"Default definition","text":"

    The default value is detected based on the preprocessor macros __cpp_impl_three_way_comparison and __cpp_lib_three_way_comparison.

    When the macro is not defined, the library will define it to its default value.

    "},{"location":"api/macros/json_has_three_way_comparison/#examples","title":"Examples","text":"Example

    The code below forces the library to use 3-way comparison:

    #define JSON_HAS_THREE_WAY_COMPARISON 1\n#include <nlohmann/json.hpp>\n\n...\n
    "},{"location":"api/macros/json_has_three_way_comparison/#version-history","title":"Version history","text":"
    • Added in version 3.11.0.
    "},{"location":"api/macros/json_no_io/","title":"JSON_NO_IO","text":"
    #define JSON_NO_IO\n

    When defined, headers <cstdio>, <ios>, <iosfwd>, <istream>, and <ostream> are not included and parse functions relying on these headers are excluded. This is relevant for environments where these I/O functions are disallowed for security reasons (e.g., Intel Software Guard Extensions (SGX)).

    "},{"location":"api/macros/json_no_io/#default-definition","title":"Default definition","text":"

    By default, JSON_NO_IO is not defined.

    #undef JSON_NO_IO\n
    "},{"location":"api/macros/json_no_io/#examples","title":"Examples","text":"Example

    The code below forces the library not to use the headers <cstdio>, <ios>, <iosfwd>, <istream>, and <ostream>.

    #define JSON_NO_IO 1\n#include <nlohmann/json.hpp>\n\n...\n
    "},{"location":"api/macros/json_no_io/#version-history","title":"Version history","text":"
    • Added in version 3.10.0.
    "},{"location":"api/macros/json_noexception/","title":"JSON_NOEXCEPTION","text":"
    #define JSON_NOEXCEPTION\n

    Exceptions can be switched off by defining the symbol JSON_NOEXCEPTION. When defining JSON_NOEXCEPTION, try is replaced by if (true), catch is replaced by if (false), and throw is replaced by std::abort().

    The same effect is achieved by setting the compiler flag -fno-exceptions.

    "},{"location":"api/macros/json_noexception/#default-definition","title":"Default definition","text":"

    By default, the macro is not defined.

    #undef JSON_NOEXCEPTION\n
    "},{"location":"api/macros/json_noexception/#notes","title":"Notes","text":"

    The explanatory what() string of exceptions is not available for MSVC if exceptions are disabled, see #2824.

    "},{"location":"api/macros/json_noexception/#examples","title":"Examples","text":"Example

    The code below switches off exceptions in the library.

    #define JSON_NOEXCEPTION 1\n#include <nlohmann/json.hpp>\n\n...\n
    "},{"location":"api/macros/json_noexception/#see-also","title":"See also","text":"
    • Switch off exceptions for more information how to switch off exceptions
    "},{"location":"api/macros/json_noexception/#version-history","title":"Version history","text":"

    Added in version 2.1.0.

    "},{"location":"api/macros/json_skip_library_version_check/","title":"JSON_SKIP_LIBRARY_VERSION_CHECK","text":"
    #define JSON_SKIP_LIBRARY_VERSION_CHECK\n

    When defined, the library will not create a compiler warning when a different version of the library was already included.

    "},{"location":"api/macros/json_skip_library_version_check/#default-definition","title":"Default definition","text":"

    By default, the macro is not defined.

    #undef JSON_SKIP_LIBRARY_VERSION_CHECK\n
    "},{"location":"api/macros/json_skip_library_version_check/#notes","title":"Notes","text":"

    ABI compatibility

    Mixing different library versions in the same code can be a problem as the different versions may not be ABI compatible.

    "},{"location":"api/macros/json_skip_library_version_check/#examples","title":"Examples","text":"

    Example

    The following warning will be shown in case a different version of the library was already included:

    Already included a different version of the library!\n
    "},{"location":"api/macros/json_skip_library_version_check/#version-history","title":"Version history","text":"

    Added in version 3.11.0.

    "},{"location":"api/macros/json_skip_unsupported_compiler_check/","title":"JSON_SKIP_UNSUPPORTED_COMPILER_CHECK","text":"
    #define JSON_SKIP_UNSUPPORTED_COMPILER_CHECK\n

    When defined, the library will not create a compile error when a known unsupported compiler is detected. This allows using the library with compilers that do not fully support C++11 and may only work if unsupported features are not used.

    "},{"location":"api/macros/json_skip_unsupported_compiler_check/#default-definition","title":"Default definition","text":"

    By default, the macro is not defined.

    #undef JSON_SKIP_UNSUPPORTED_COMPILER_CHECK\n
    "},{"location":"api/macros/json_skip_unsupported_compiler_check/#examples","title":"Examples","text":"Example

    The code below switches off the check whether the compiler is supported.

    #define JSON_SKIP_UNSUPPORTED_COMPILER_CHECK 1\n#include <nlohmann/json.hpp>\n\n...\n
    "},{"location":"api/macros/json_skip_unsupported_compiler_check/#version-history","title":"Version history","text":"

    Added in version 3.2.0.

    "},{"location":"api/macros/json_throw_user/","title":"JSON_CATCH_USER, JSON_THROW_USER, JSON_TRY_USER","text":"
    // (1)\n#define JSON_CATCH_USER(exception) /* value */\n// (2)\n#define JSON_THROW_USER(exception) /* value */\n// (3)\n#define JSON_TRY_USER /* value */\n

    Controls how exceptions are handled by the library.

    1. This macro overrides catch calls inside the library. The argument is the type of the exception to catch. As of version 3.8.0, the library only catches std::out_of_range exceptions internally to rethrow them as json::out_of_range exceptions. The macro is always followed by a scope.
    2. This macro overrides throw calls inside the library. The argument is the exception to be thrown. Note that JSON_THROW_USER should leave the current scope (e.g., by throwing or aborting), as continuing after it may yield undefined behavior.
    3. This macro overrides try calls inside the library. It has no arguments and is always followed by a scope.
    "},{"location":"api/macros/json_throw_user/#parameters","title":"Parameters","text":"exception (in) an exception type"},{"location":"api/macros/json_throw_user/#default-definition","title":"Default definition","text":"

    By default, the macros map to their respective C++ keywords:

    #define JSON_CATCH_USER(exception) catch(exception)\n#define JSON_THROW_USER(exception) throw exception\n#define JSON_TRY_USER              try\n

    When exceptions are switched off, the try block is executed unconditionally, and throwing exceptions is replaced by calling std::abort to make reaching the throw branch abort the process.

    #define JSON_THROW_USER(exception) std::abort()\n#define JSON_TRY_USER              if (true)\n#define JSON_CATCH_USER(exception) if (false)\n
    "},{"location":"api/macros/json_throw_user/#examples","title":"Examples","text":"Example

    The code below switches off exceptions and creates a log entry with a detailed error message in case of errors.

    #include <iostream>\n\n#define JSON_TRY_USER if(true)\n#define JSON_CATCH_USER(exception) if(false)\n#define JSON_THROW_USER(exception)                           \\\n    {std::clog << \"Error in \" << __FILE__ << \":\" << __LINE__ \\\n               << \" (function \" << __FUNCTION__ << \") - \"    \\\n               << (exception).what() << std::endl;           \\\n     std::abort();}\n\n#include <nlohmann/json.hpp>\n
    "},{"location":"api/macros/json_throw_user/#see-also","title":"See also","text":"
    • Switch off exceptions for more information how to switch off exceptions
    • JSON_NOEXCEPTION - switch off exceptions
    "},{"location":"api/macros/json_throw_user/#version-history","title":"Version history","text":"
    • Added in version 3.1.0.
    "},{"location":"api/macros/json_use_global_udls/","title":"JSON_USE_GLOBAL_UDLS","text":"
    #define JSON_USE_GLOBAL_UDLS /* value */\n

    When defined to 1, the user-defined string literals (UDLs) are placed into the global namespace instead of nlohmann::literals::json_literals.

    "},{"location":"api/macros/json_use_global_udls/#default-definition","title":"Default definition","text":"

    The default value is 1.

    #define JSON_USE_GLOBAL_UDLS 1\n

    When the macro is not defined, the library will define it to its default value.

    "},{"location":"api/macros/json_use_global_udls/#notes","title":"Notes","text":"

    Future behavior change

    The user-defined string literals will be removed from the global namespace in the next major release of the library.

    To prepare existing code, define JSON_USE_GLOBAL_UDLS to 0 and bring the string literals into scope where needed. Refer to any of the string literals for details.

    CMake option

    The placement of user-defined string literals can also be controlled with the CMake option JSON_GlobalUDLs (ON by default) which defines JSON_USE_GLOBAL_UDLS accordingly.

    "},{"location":"api/macros/json_use_global_udls/#examples","title":"Examples","text":"Example 1: Default behavior

    The code below shows the default behavior using the _json UDL.

    #include <nlohmann/json.hpp>\n\n#include <iostream>\n\nint main()\n{\n    auto j = \"42\"_json;\n\n    std::cout << j << std::endl;\n}\n

    Output:

    42\n
    Example 2: Namespaced UDLs

    The code below shows how UDLs need to be brought into scope before using _json when JSON_USE_GLOBAL_UDLS is defined to 0.

    #define JSON_USE_GLOBAL_UDLS 0\n#include <nlohmann/json.hpp>\n\n#include <iostream>\n\nint main()\n{\n    // auto j = \"42\"_json; // This line would fail to compile,\n                           // because the UDLs are not in the global namespace\n\n    // Bring the UDLs into scope\n    using namespace nlohmann::json_literals;\n\n    auto j = \"42\"_json;\n\n    std::cout << j << std::endl;\n}\n

    Output:

    42\n
    "},{"location":"api/macros/json_use_global_udls/#see-also","title":"See also","text":"
    • operator\"\"_json
    • operator\"\"_json_pointer
    • JSON_GlobalUDLs - CMake option to control the macro
    "},{"location":"api/macros/json_use_global_udls/#version-history","title":"Version history","text":"
    • Added in version 3.11.0.
    "},{"location":"api/macros/json_use_implicit_conversions/","title":"JSON_USE_IMPLICIT_CONVERSIONS","text":"
    #define JSON_USE_IMPLICIT_CONVERSIONS /* value */\n

    When defined to 0, implicit conversions are switched off. By default, implicit conversions are switched on. The value directly affects operator ValueType.

    "},{"location":"api/macros/json_use_implicit_conversions/#default-definition","title":"Default definition","text":"

    By default, implicit conversions are enabled.

    #define JSON_USE_IMPLICIT_CONVERSIONS 1\n
    "},{"location":"api/macros/json_use_implicit_conversions/#notes","title":"Notes","text":"

    Future behavior change

    Implicit conversions will be switched off by default in the next major release of the library.

    You can prepare existing code by already defining JSON_USE_IMPLICIT_CONVERSIONS to 0 and replace any implicit conversions with calls to get.

    CMake option

    Implicit conversions can also be controlled with the CMake option JSON_ImplicitConversions (ON by default) which defines JSON_USE_IMPLICIT_CONVERSIONS accordingly.

    "},{"location":"api/macros/json_use_implicit_conversions/#examples","title":"Examples","text":"Example

    This is an example for an implicit conversion:

    json j = \"Hello, world!\";\nstd::string s = j;\n

    When JSON_USE_IMPLICIT_CONVERSIONS is defined to 0, the code above does no longer compile. Instead, it must be written like this:

    json j = \"Hello, world!\";\nauto s = j.template get<std::string>();\n
    "},{"location":"api/macros/json_use_implicit_conversions/#see-also","title":"See also","text":"
    • operator ValueType - get a value (implicit)
    • get - get a value (explicit)
    • JSON_ImplicitConversions - CMake option to control the macro
    "},{"location":"api/macros/json_use_implicit_conversions/#version-history","title":"Version history","text":"
    • Added in version 3.9.0.
    "},{"location":"api/macros/json_use_legacy_discarded_value_comparison/","title":"JSON_USE_LEGACY_DISCARDED_VALUE_COMPARISON","text":"
    #define JSON_USE_LEGACY_DISCARDED_VALUE_COMPARISON /* value */\n

    This macro enables the (incorrect) legacy comparison behavior of discarded JSON values. Possible values are 1 to enable or 0 to disable (default).

    When enabled, comparisons involving at least one discarded JSON value yield results as follows:

    Operator Result == false != true < false <= true >= true > false

    Otherwise, comparisons involving at least one discarded JSON value always yield false.

    "},{"location":"api/macros/json_use_legacy_discarded_value_comparison/#default-definition","title":"Default definition","text":"

    The default value is 0.

    #define JSON_USE_LEGACY_DISCARDED_VALUE_COMPARISON 0\n

    When the macro is not defined, the library will define it to its default value.

    "},{"location":"api/macros/json_use_legacy_discarded_value_comparison/#notes","title":"Notes","text":"

    Inconsistent behavior in C++20 and beyond

    When targeting C++20 or above, enabling the legacy comparison behavior is strongly discouraged.

    • The 3-way comparison operator (<=>) will always give the correct result (std::partial_ordering::unordered) regardless of the value of JSON_USE_LEGACY_DISCARDED_VALUE_COMPARISON.
    • Overloads for the equality and relational operators emulate the legacy behavior.

    Code outside your control may use either 3-way comparison or the equality and relational operators, resulting in inconsistent and unpredictable behavior.

    See operator<=> for more information on 3-way comparison.

    Deprecation

    The legacy comparison behavior is deprecated and may be removed in a future major version release.

    New code should not depend on it and existing code should try to remove or rewrite expressions relying on it.

    CMake option

    Legacy comparison can also be controlled with the CMake option JSON_LegacyDiscardedValueComparison (OFF by default) which defines JSON_USE_LEGACY_DISCARDED_VALUE_COMPARISON accordingly.

    "},{"location":"api/macros/json_use_legacy_discarded_value_comparison/#examples","title":"Examples","text":"Example

    The code below switches on the legacy discarded value comparison behavior in the library.

    #define JSON_USE_LEGACY_DISCARDED_VALUE_COMPARISON 1\n#include <nlohmann/json.hpp>\n\n...\n
    "},{"location":"api/macros/json_use_legacy_discarded_value_comparison/#see-also","title":"See also","text":"
    • JSON_LegacyDiscardedValueComparison - CMake option to control the macro
    "},{"location":"api/macros/json_use_legacy_discarded_value_comparison/#version-history","title":"Version history","text":"
    • Added in version 3.11.0.
    "},{"location":"api/macros/nlohmann_define_derived_type/","title":"NLOHMANN_DEFINE_DERIVED_TYPE_INTRUSIVE, NLOHMANN_DEFINE_DERIVED_TYPE_INTRUSIVE_WITH_DEFAULT, NLOHMANN_DEFINE_DERIVED_TYPE_INTRUSIVE_ONLY_SERIALIZE, NLOHMANN_DEFINE_DERIVED_TYPE_NON_INTRUSIVE, NLOHMANN_DEFINE_DERIVED_TYPE_NON_INTRUSIVE_WITH_DEFAULT, NLOHMANN_DEFINE_DERIVED_TYPE_NON_INTRUSIVE_ONLY_SERIALIZE","text":"NLOHMANN_DEFINE_DERIVED_TYPE_INTRUSIVE, NLOHMANN_DEFINE_DERIVED_TYPE_INTRUSIVE_WITH_DEFAULT, NLOHMANN_DEFINE_DERIVED_TYPE_INTRUSIVE_ONLY_SERIALIZE, NLOHMANN_DEFINE_DERIVED_TYPE_NON_INTRUSIVE, NLOHMANN_DEFINE_DERIVED_TYPE_NON_INTRUSIVE_WITH_DEFAULT, NLOHMANN_DEFINE_DERIVED_TYPE_NON_INTRUSIVE_ONLY_SERIALIZE 
    // (1)\n#define NLOHMANN_DEFINE_DERIVED_TYPE_INTRUSIVE(type, base_type, member...)\n// (2)\n#define NLOHMANN_DEFINE_DERIVED_TYPE_INTRUSIVE_WITH_DEFAULT(type, base_type, member...)\n// (3)\n#define NLOHMANN_DEFINE_DERIVED_TYPE_INTRUSIVE_ONLY_SERIALIZE(type, base_type, member...)\n\n// (4)\n#define NLOHMANN_DEFINE_DERIVED_TYPE_NON_INTRUSIVE(type, base_type, member...)\n// (5)\n#define NLOHMANN_DEFINE_DERIVED_TYPE_NON_INTRUSIVE_WITH_DEFAULT(type, base_type, member...)\n// (6)\n#define NLOHMANN_DEFINE_DERIVED_TYPE_NON_INTRUSIVE_ONLY_SERIALIZE(type, base_type, member...)\n

    These macros can be used to simplify the serialization/deserialization of derived types if you want to use a JSON object as serialization and want to use the member variable names as object keys in that object.

    • Macros 1, 2, and 3 are to be defined inside the class/struct to create code for. Like NLOHMANN_DEFINE_TYPE_INTRUSIVE, they can access private members.
    • Macros 4, 5, and 6 are to be defined outside the class/struct to create code for, but inside its namespace. Like NLOHMANN_DEFINE_TYPE_NON_INTRUSIVE, they cannot access private members.

    The first parameter is the name of the derived class/struct, the second parameter is the name of the base class/struct and all remaining parameters name the members. The base type must be already serializable/deserializable.

    • Macros 1 and 4 will use at during deserialization and will throw out_of_range.403 if a key is missing in the JSON object.
    • Macros 2 and 5 will use value during deserialization and fall back to the default value for the respective type of the member variable if a key in the JSON object is missing. The generated from_json() function default constructs an object and uses its values as the defaults when calling the value function.

    Summary:

    Need access to private members Need only de-serialization Allow missing values when de-serializing macro NLOHMANN_DEFINE_DERIVED_TYPE_INTRUSIVE NLOHMANN_DEFINE_DERIVED_TYPE_INTRUSIVE_WITH_DEFAULT NLOHMANN_DEFINE_DERIVED_TYPE_INTRUSIVE_ONLY_SERIALIZE NLOHMANN_DEFINE_DERIVED_TYPE_NON_INTRUSIVE NLOHMANN_DEFINE_DERIVED_TYPE_NON_INTRUSIVE_WITH_DEFAULT NLOHMANN_DEFINE_DERIVED_TYPE_NON_INTRUSIVE_ONLY_SERIALIZE"},{"location":"api/macros/nlohmann_define_derived_type/#parameters","title":"Parameters","text":"type (in) name of the type (class, struct) to serialize/deserialize base_type (in) name of the base type (class, struct) type is derived from member (in) name of the member variable to serialize/deserialize; up to 64 members can be given as a comma-separated list"},{"location":"api/macros/nlohmann_define_derived_type/#default-definition","title":"Default definition","text":"

    Macros 1 and 2 add two friend functions to the class which take care of the serialization and deserialization:

    template<typename BasicJsonType>\nfriend void to_json(BasicJsonType&, const type&);\ntemplate<typename BasicJsonType>\nfriend void from_json(const BasicJsonType&, type&);\n

    Macros 4 and 5 add two functions to the namespace which take care of the serialization and deserialization:

    template<typename BasicJsonType>\nvoid to_json(BasicJsonType&, const type&);\ntemplate<typename BasicJsonType>\nvoid from_json(const BasicJsonType&, type&);\n

    Macros 3 and 6 add one function to the namespace, which takes care of the serialization only:

    template<typename BasicJsonType>\nvoid to_json(BasicJsonType&, const type&);\n

    In first two cases, they call the to_json/from_json functions of the base type before serializing/deserializing the members of the derived type:

    class A { /* ... */ };\nclass B : public A { /* ... */ };\n\ntemplate<typename BasicJsonType>\nvoid to_json(BasicJsonType& j, const B& b) {\n    nlohmann::to_json(j, static_cast<const A&>(b));\n    // ...\n}\n\ntemplate<typename BasicJsonType>\nvoid from_json(const BasicJsonType& j, B& b) {\n    nlohmann::from_json(j, static_cast<A&>(b));\n    // ...\n}\n

    In the third case, only to_json will be called:

    class A { /* ... */ };\nclass B : public A { /* ... */ };\n\ntemplate<typename BasicJsonType>\nvoid to_json(BasicJsonType& j, const B& b) {\n    nlohmann::to_json(j, static_cast<const A&>(b));\n    // ...\n}\n
    "},{"location":"api/macros/nlohmann_define_derived_type/#notes","title":"Notes","text":"

    Prerequisites

    • Macros 1, 2, and 3 have the same prerequisites of NLOHMANN_DEFINE_TYPE_INTRUSIVE.
    • Macros 4, 5, and 6 have the same prerequisites of NLOHMANN_DEFINE_TYPE_NON_INTRUSIVE.
    • Serialization/deserialization of base types must be defined.

    Implementation limits

    See Implementation limits for NLOHMANN_DEFINE_TYPE_INTRUSIVE and NLOHMANN_DEFINE_TYPE_NON_INTRUSIVE, respectively.

    "},{"location":"api/macros/nlohmann_define_derived_type/#examples","title":"Examples","text":"NLOHMANN_DEFINE_DERIVED_TYPE_INTRUSIVE

    Consider the following complete example:

    #include <iostream>\n#include <iomanip>\n#include <nlohmann/json.hpp>\n\nusing nlohmann::json;\n\nclass A\n{\n  private:\n    double Aa = 0.0;\n    double Ab = 0.0;\n\n  public:\n    A() = default;\n    A(double a, double b) : Aa(a), Ab(b) {}\n    NLOHMANN_DEFINE_TYPE_INTRUSIVE(A, Aa, Ab)\n};\n\nclass B : public A\n{\n  private:\n    int Ba = 0;\n    int Bb = 0;\n\n  public:\n    B() = default;\n    B(int a, int b, double aa, double ab) : A(aa, ab), Ba(a), Bb(b) {}\n    NLOHMANN_DEFINE_DERIVED_TYPE_INTRUSIVE(B, A, Ba, Bb)\n};\n\nint main()\n{\n    B example(23, 42, 3.142, 1.777);\n    json example_json = example;\n\n    std::cout << std::setw(4) << example_json << std::endl;\n}\n

    Output:

    {\n    \"Aa\": 3.142,\n    \"Ab\": 1.777,\n    \"Ba\": 23,\n    \"Bb\": 42\n}\n

    Notes:

    • A and B are default-constructible. This is a requirement for using the macro.
    • A has private members and is not a derived class. Hence, macro NLOHMANN_DEFINE_TYPE_INTRUSIVE is used.
    • As B is a derived class, NLOHMANN_DEFINE_TYPE_INTRUSIVE is not applicable, but NLOHMANN_DEFINE_DERIVED_TYPE_INTRUSIVE must be used.
    • The macro NLOHMANN_DEFINE_DERIVED_TYPE_INTRUSIVE is used inside the class use as NLOHMANN_DEFINE_TYPE_INTRUSIVE.
    "},{"location":"api/macros/nlohmann_define_derived_type/#see-also","title":"See also","text":"
    • NLOHMANN_DEFINE_TYPE_INTRUSIVE / NLOHMANN_DEFINE_TYPE_INTRUSIVE_WITH_DEFAULT / NLOHMANN_DEFINE_DERIVED_TYPE_INTRUSIVE_ONLY_SERIALIZE for similar macros that can be defined inside a non-derived type.
    • NLOHMANN_DEFINE_TYPE_NON_INTRUSIVE / NLOHMANN_DEFINE_TYPE_NON_INTRUSIVE_WITH_DEFAULT / NLOHMANN_DEFINE_DERIVED_TYPE_NON_INTRUSIVE_ONLY_SERIALIZE for similar macros that can be defined outside a non-derived type.
    • Arbitrary Type Conversions for an overview.
    "},{"location":"api/macros/nlohmann_define_derived_type/#version-history","title":"Version history","text":"
    1. Added in version 3.12.0.
    2. Added in version 3.12.0.
    3. Added in version 3.12.0.
    4. Added in version 3.12.0.
    5. Added in version 3.12.0.
    6. Added in version 3.12.0.
    "},{"location":"api/macros/nlohmann_define_type_intrusive/","title":"NLOHMANN_DEFINE_TYPE_INTRUSIVE, NLOHMANN_DEFINE_TYPE_INTRUSIVE_WITH_DEFAULT, NLOHMANN_DEFINE_TYPE_INTRUSIVE_ONLY_SERIALIZE","text":"
    #define NLOHMANN_DEFINE_TYPE_INTRUSIVE(type, member...)              // (1)\n#define NLOHMANN_DEFINE_TYPE_INTRUSIVE_WITH_DEFAULT(type, member...) // (2)\n#define NLOHMANN_DEFINE_TYPE_INTRUSIVE_ONLY_SERIALIZE(type, member...) // (3)\n

    These macros can be used to simplify the serialization/deserialization of types if you want to use a JSON object as serialization and want to use the member variable names as object keys in that object. The macro is to be defined inside the class/struct to create code for. Unlike NLOHMANN_DEFINE_TYPE_NON_INTRUSIVE, it can access private members. The first parameter is the name of the class/struct, and all remaining parameters name the members.

    1. Will use at during deserialization and will throw out_of_range.403 if a key is missing in the JSON object.
    2. Will use value during deserialization and fall back to the default value for the respective type of the member variable if a key in the JSON object is missing. The generated from_json() function default constructs an object and uses its values as the defaults when calling the value function.
    3. Only defines the serialization. Useful in cases when the type does not have a default constructor and only serialization is required.

    Summary:

    Need access to private members Need only de-serialization Allow missing values when de-serializing macro NLOHMANN_DEFINE_TYPE_INTRUSIVE NLOHMANN_DEFINE_TYPE_INTRUSIVE_WITH_DEFAULT NLOHMANN_DEFINE_TYPE_INTRUSIVE_ONLY_SERIALIZE"},{"location":"api/macros/nlohmann_define_type_intrusive/#parameters","title":"Parameters","text":"type (in) name of the type (class, struct) to serialize/deserialize member (in) name of the member variable to serialize/deserialize; up to 64 members can be given as a comma-separated list"},{"location":"api/macros/nlohmann_define_type_intrusive/#default-definition","title":"Default definition","text":"

    The macros add two friend functions to the class which take care of the serialization and deserialization:

    template<typename BasicJsonType>\nfriend void to_json(BasicJsonType&, const type&);\ntemplate<typename BasicJsonType>\nfriend void from_json(const BasicJsonType&, type&); // except (3)\n

    See the examples below for the concrete generated code.

    "},{"location":"api/macros/nlohmann_define_type_intrusive/#notes","title":"Notes","text":"

    Prerequisites

    1. The type type must be default constructible (except (3)). See How can I use get() for non-default constructible/non-copyable types? for how to overcome this limitation.
    2. The macro must be used inside the type (class/struct).

    Implementation limits

    • The current implementation is limited to at most 64 member variables. If you want to serialize/deserialize types with more than 64 member variables, you need to define the to_json/from_json functions manually.
    "},{"location":"api/macros/nlohmann_define_type_intrusive/#examples","title":"Examples","text":"Example (1): NLOHMANN_DEFINE_TYPE_INTRUSIVE

    Consider the following complete example:

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\nusing namespace nlohmann::literals;\n\nnamespace ns\n{\nclass person\n{\n  private:\n    std::string name = \"John Doe\";\n    std::string address = \"123 Fake St\";\n    int age = -1;\n\n  public:\n    person() = default;\n    person(std::string name_, std::string address_, int age_)\n        : name(std::move(name_)), address(std::move(address_)), age(age_)\n    {}\n\n    NLOHMANN_DEFINE_TYPE_INTRUSIVE(person, name, address, age)\n};\n} // namespace ns\n\nint main()\n{\n    ns::person p = {\"Ned Flanders\", \"744 Evergreen Terrace\", 60};\n\n    // serialization: person -> json\n    json j = p;\n    std::cout << \"serialization: \" << j << std::endl;\n\n    // deserialization: json -> person\n    json j2 = R\"({\"address\": \"742 Evergreen Terrace\", \"age\": 40, \"name\": \"Homer Simpson\"})\"_json;\n    auto p2 = j2.template get<ns::person>();\n\n    // incomplete deserialization:\n    json j3 = R\"({\"address\": \"742 Evergreen Terrace\", \"name\": \"Maggie Simpson\"})\"_json;\n    try\n    {\n        auto p3 = j3.template get<ns::person>();\n    }\n    catch (const json::exception& e)\n    {\n        std::cout << \"deserialization failed: \" << e.what() << std::endl;\n    }\n}\n

    Output:

    serialization: {\"address\":\"744 Evergreen Terrace\",\"age\":60,\"name\":\"Ned Flanders\"}\ndeserialization failed: [json.exception.out_of_range.403] key 'age' not found\n

    Notes:

    • ns::person is default-constructible. This is a requirement for using the macro.
    • ns::person has private member variables. This makes NLOHMANN_DEFINE_TYPE_INTRUSIVE applicable, but not NLOHMANN_DEFINE_TYPE_NON_INTRUSIVE.
    • The macro NLOHMANN_DEFINE_TYPE_INTRUSIVE is used inside the class.
    • A missing key \"age\" in the deserialization yields an exception. To fall back to the default value, NLOHMANN_DEFINE_TYPE_INTRUSIVE_WITH_DEFAULT can be used.

    The macro is equivalent to:

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\nusing namespace nlohmann::literals;\n\nnamespace ns\n{\nclass person\n{\n  private:\n    std::string name = \"John Doe\";\n    std::string address = \"123 Fake St\";\n    int age = -1;\n\n  public:\n    person() = default;\n    person(std::string name_, std::string address_, int age_)\n        : name(std::move(name_)), address(std::move(address_)), age(age_)\n    {}\n\n    template<typename BasicJsonType>\n    friend void to_json(BasicJsonType& nlohmann_json_j, const person& nlohmann_json_t)\n    {\n        nlohmann_json_j[\"name\"] = nlohmann_json_t.name;\n        nlohmann_json_j[\"address\"] = nlohmann_json_t.address;\n        nlohmann_json_j[\"age\"] = nlohmann_json_t.age;\n    }\n\n    template<typename BasicJsonType>\n    friend void from_json(const BasicJsonType& nlohmann_json_j, person& nlohmann_json_t)\n    {\n        nlohmann_json_t.name = nlohmann_json_j.at(\"name\");\n        nlohmann_json_t.address = nlohmann_json_j.at(\"address\");\n        nlohmann_json_t.age = nlohmann_json_j.at(\"age\");\n    }\n};\n} // namespace ns\n\nint main()\n{\n    ns::person p = {\"Ned Flanders\", \"744 Evergreen Terrace\", 60};\n\n    // serialization: person -> json\n    json j = p;\n    std::cout << \"serialization: \" << j << std::endl;\n\n    // deserialization: json -> person\n    json j2 = R\"({\"address\": \"742 Evergreen Terrace\", \"age\": 40, \"name\": \"Homer Simpson\"})\"_json;\n    auto p2 = j2.template get<ns::person>();\n\n    // incomplete deserialization:\n    json j3 = R\"({\"address\": \"742 Evergreen Terrace\", \"name\": \"Maggie Simpson\"})\"_json;\n    try\n    {\n        auto p3 = j3.template get<ns::person>();\n    }\n    catch (const json::exception& e)\n    {\n        std::cout << \"deserialization failed: \" << e.what() << std::endl;\n    }\n}\n
    Example (2): NLOHMANN_DEFINE_TYPE_INTRUSIVE_WITH_DEFAULT

    Consider the following complete example:

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\nusing namespace nlohmann::literals;\n\nnamespace ns\n{\nclass person\n{\n  private:\n    std::string name = \"John Doe\";\n    std::string address = \"123 Fake St\";\n    int age = -1;\n\n  public:\n    person() = default;\n    person(std::string name_, std::string address_, int age_)\n        : name(std::move(name_)), address(std::move(address_)), age(age_)\n    {}\n\n    NLOHMANN_DEFINE_TYPE_INTRUSIVE_WITH_DEFAULT(person, name, address, age)\n};\n} // namespace ns\n\nint main()\n{\n    ns::person p = {\"Ned Flanders\", \"744 Evergreen Terrace\", 60};\n\n    // serialization: person -> json\n    json j = p;\n    std::cout << \"serialization: \" << j << std::endl;\n\n    // deserialization: json -> person\n    json j2 = R\"({\"address\": \"742 Evergreen Terrace\", \"age\": 40, \"name\": \"Homer Simpson\"})\"_json;\n    auto p2 = j2.template get<ns::person>();\n\n    // incomplete deserialization:\n    json j3 = R\"({\"address\": \"742 Evergreen Terrace\", \"name\": \"Maggie Simpson\"})\"_json;\n    auto p3 = j3.template get<ns::person>();\n    std::cout << \"roundtrip: \" << json(p3) << std::endl;\n}\n

    Output:

    serialization: {\"address\":\"744 Evergreen Terrace\",\"age\":60,\"name\":\"Ned Flanders\"}\nroundtrip: {\"address\":\"742 Evergreen Terrace\",\"age\":-1,\"name\":\"Maggie Simpson\"}\n

    Notes:

    • ns::person is default-constructible. This is a requirement for using the macro.
    • ns::person has private member variables. This makes NLOHMANN_DEFINE_TYPE_INTRUSIVE_WITH_DEFAULT applicable, but not NLOHMANN_DEFINE_TYPE_NON_INTRUSIVE_WITH_DEFAULT.
    • The macro NLOHMANN_DEFINE_TYPE_INTRUSIVE_WITH_DEFAULT is used inside the class.
    • A missing key \"age\" in the deserialization does not yield an exception. Instead, the default value -1 is used.

    The macro is equivalent to:

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\nusing namespace nlohmann::literals;\n\nnamespace ns\n{\nclass person\n{\n  private:\n    std::string name = \"John Doe\";\n    std::string address = \"123 Fake St\";\n    int age = -1;\n\n  public:\n    person() = default;\n    person(std::string name_, std::string address_, int age_)\n        : name(std::move(name_)), address(std::move(address_)), age(age_)\n    {}\n\n    template<typename BasicJsonType>\n    friend void to_json(BasicJsonType& nlohmann_json_j, const person& nlohmann_json_t)\n    {\n        nlohmann_json_j[\"name\"] = nlohmann_json_t.name;\n        nlohmann_json_j[\"address\"] = nlohmann_json_t.address;\n        nlohmann_json_j[\"age\"] = nlohmann_json_t.age;\n    }\n\n    template<typename BasicJsonType>\n    friend void from_json(const BasicJsonType& nlohmann_json_j, person& nlohmann_json_t)\n    {\n        person nlohmann_json_default_obj;\n        nlohmann_json_t.name = nlohmann_json_j.value(\"name\", nlohmann_json_default_obj.name);\n        nlohmann_json_t.address = nlohmann_json_j.value(\"address\", nlohmann_json_default_obj.address);\n        nlohmann_json_t.age = nlohmann_json_j.value(\"age\", nlohmann_json_default_obj.age);\n    }\n};\n} // namespace ns\n\nint main()\n{\n    ns::person p = {\"Ned Flanders\", \"744 Evergreen Terrace\", 60};\n\n    // serialization: person -> json\n    json j = p;\n    std::cout << \"serialization: \" << j << std::endl;\n\n    // deserialization: json -> person\n    json j2 = R\"({\"address\": \"742 Evergreen Terrace\", \"age\": 40, \"name\": \"Homer Simpson\"})\"_json;\n    auto p2 = j2.template get<ns::person>();\n\n    // incomplete deserialization:\n    json j3 = R\"({\"address\": \"742 Evergreen Terrace\", \"name\": \"Maggie Simpson\"})\"_json;\n    auto p3 = j3.template get<ns::person>();\n    std::cout << \"roundtrip: \" << json(p3) << std::endl;\n}\n

    Note how a default-initialized person object is used in the from_json to fill missing values.

    Example (3): NLOHMANN_DEFINE_TYPE_INTRUSIVE_ONLY_SERIALIZE

    Consider the following complete example:

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\nusing namespace nlohmann::literals;\n\nnamespace ns\n{\nclass person\n{\n  private:\n    std::string name = \"John Doe\";\n    std::string address = \"123 Fake St\";\n    int age = -1;\n\n  public:\n    // No default constructor\n    person(std::string name_, std::string address_, int age_)\n        : name(std::move(name_)), address(std::move(address_)), age(age_)\n    {}\n\n    NLOHMANN_DEFINE_TYPE_INTRUSIVE(person, name, address, age)\n};\n} // namespace ns\n\nint main()\n{\n    ns::person p = {\"Ned Flanders\", \"744 Evergreen Terrace\", 60};\n\n    // serialization: person -> json\n    json j = p;\n    std::cout << \"serialization: \" << j << std::endl;\n}\n

    Output:

    serialization: {\"address\":\"744 Evergreen Terrace\",\"age\":60,\"name\":\"Ned Flanders\"}\n

    Notes:

    • ns::person is non-default-constructible. This allows this macro to be used instead of NLOHMANN_DEFINE_TYPE_INTRUSIVE and NLOHMANN_DEFINE_TYPE_INTRUSIVE_WITH_DEFAULT.
    • ns::person has private member variables. This makes NLOHMANN_DEFINE_TYPE_INTRUSIVE_ONLY_SERIALIZE applicable, but not NLOHMANN_DEFINE_TYPE_NON_INTRUSIVE_ONLY_SERIALIZE.
    • The macro NLOHMANN_DEFINE_TYPE_INTRUSIVE_ONLY_SERIALIZE is used inside the class.

    The macro is equivalent to:

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\nusing namespace nlohmann::literals;\n\nnamespace ns\n{\nclass person\n{\n  private:\n    std::string name = \"John Doe\";\n    std::string address = \"123 Fake St\";\n    int age = -1;\n\n  public:\n    // No default constructor\n    person(std::string name_, std::string address_, int age_)\n        : name(std::move(name_)), address(std::move(address_)), age(age_)\n    {}\n\n    template<typename BasicJsonType>\n    friend void to_json(BasicJsonType& nlohmann_json_j, const person& nlohmann_json_t)\n    {\n        nlohmann_json_j[\"name\"] = nlohmann_json_t.name;\n        nlohmann_json_j[\"address\"] = nlohmann_json_t.address;\n        nlohmann_json_j[\"age\"] = nlohmann_json_t.age;\n    }\n};\n} // namespace ns\n\nint main()\n{\n    ns::person p = {\"Ned Flanders\", \"744 Evergreen Terrace\", 60};\n\n    // serialization: person -> json\n    json j = p;\n    std::cout << \"serialization: \" << j << std::endl;\n}\n
    "},{"location":"api/macros/nlohmann_define_type_intrusive/#see-also","title":"See also","text":"
    • NLOHMANN_DEFINE_TYPE_NON_INTRUSIVE, NLOHMANN_DEFINE_TYPE_NON_INTRUSIVE_WITH_DEFAULT, NLOHMANN_DEFINE_TYPE_NON_INTRUSIVE_ONLY_SERIALIZE for a similar macro that can be defined outside the type.
    • NLOHMANN_DEFINE_DERIVED_TYPE_INTRUSIVE, NLOHMANN_DEFINE_DERIVED_TYPE_INTRUSIVE_WITH_DEFAULT, NLOHMANN_DEFINE_DERIVED_TYPE_INTRUSIVE_ONLY_SERIALIZE, NLOHMANN_DEFINE_DERIVED_TYPE_NON_INTRUSIVE, NLOHMANN_DEFINE_DERIVED_TYPE_NON_INTRUSIVE_WITH_DEFAULT, NLOHMANN_DEFINE_DERIVED_TYPE_NON_INTRUSIVE_ONLY_SERIALIZE for similar macros for derived types
    • Arbitrary Type Conversions for an overview.
    "},{"location":"api/macros/nlohmann_define_type_intrusive/#version-history","title":"Version history","text":"
    1. Added in version 3.9.0.
    2. Added in version 3.11.0.
    3. Added in version 3.11.3.
    "},{"location":"api/macros/nlohmann_define_type_non_intrusive/","title":"NLOHMANN_DEFINE_TYPE_NON_INTRUSIVE, NLOHMANN_DEFINE_TYPE_NON_INTRUSIVE_WITH_DEFAULT, NLOHMANN_DEFINE_TYPE_NON_INTRUSIVE_ONLY_SERIALIZE","text":"
    #define NLOHMANN_DEFINE_TYPE_NON_INTRUSIVE(type, member...)              // (1)\n#define NLOHMANN_DEFINE_TYPE_NON_INTRUSIVE_WITH_DEFAULT(type, member...) // (2)\n#define NLOHMANN_DEFINE_TYPE_NON_INTRUSIVE_ONLY_SERIALIZE(type, member...) // (3)\n

    These macros can be used to simplify the serialization/deserialization of types if you want to use a JSON object as serialization and want to use the member variable names as object keys in that object. The macro is to be defined outside the class/struct to create code for, but inside its namespace. Unlike NLOHMANN_DEFINE_TYPE_INTRUSIVE, it cannot access private members. The first parameter is the name of the class/struct, and all remaining parameters name the members.

    1. Will use at during deserialization and will throw out_of_range.403 if a key is missing in the JSON object.
    2. Will use value during deserialization and fall back to the default value for the respective type of the member variable if a key in the JSON object is missing. The generated from_json() function default constructs an object and uses its values as the defaults when calling the value function.
    3. Only defines the serialization. Useful in cases when the type does not have a default constructor and only serialization is required.

    Summary:

    Need access to private members Need only de-serialization Allow missing values when de-serializing macro NLOHMANN_DEFINE_TYPE_NON_INTRUSIVE NLOHMANN_DEFINE_TYPE_NON_INTRUSIVE_WITH_DEFAULT NLOHMANN_DEFINE_TYPE_NON_INTRUSIVE_ONLY_SERIALIZE"},{"location":"api/macros/nlohmann_define_type_non_intrusive/#parameters","title":"Parameters","text":"type (in) name of the type (class, struct) to serialize/deserialize member (in) name of the (public) member variable to serialize/deserialize; up to 64 members can be given as a comma-separated list"},{"location":"api/macros/nlohmann_define_type_non_intrusive/#default-definition","title":"Default definition","text":"

    The macros add two functions to the namespace which take care of the serialization and deserialization:

    template<typename BasicJsonType>\nvoid to_json(BasicJsonType&, const type&);\ntemplate<typename BasicJsonType>\nvoid from_json(const BasicJsonType&, type&); // except (3)\n

    See the examples below for the concrete generated code.

    "},{"location":"api/macros/nlohmann_define_type_non_intrusive/#notes","title":"Notes","text":"

    Prerequisites

    1. The type type must be default constructible (except (3). See How can I use get() for non-default constructible/non-copyable types? for how to overcome this limitation.
    2. The macro must be used outside the type (class/struct).
    3. The passed members must be public.

    Implementation limits

    • The current implementation is limited to at most 64 member variables. If you want to serialize/deserialize types with more than 64 member variables, you need to define the to_json/from_json functions manually.
    "},{"location":"api/macros/nlohmann_define_type_non_intrusive/#examples","title":"Examples","text":"Example (1): NLOHMANN_DEFINE_TYPE_NON_INTRUSIVE

    Consider the following complete example:

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\nusing namespace nlohmann::literals;\n\nnamespace ns\n{\nstruct person\n{\n    std::string name;\n    std::string address;\n    int age;\n};\n\nNLOHMANN_DEFINE_TYPE_NON_INTRUSIVE(person, name, address, age)\n} // namespace ns\n\nint main()\n{\n    ns::person p = {\"Ned Flanders\", \"744 Evergreen Terrace\", 60};\n\n    // serialization: person -> json\n    json j = p;\n    std::cout << \"serialization: \" << j << std::endl;\n\n    // deserialization: json -> person\n    json j2 = R\"({\"address\": \"742 Evergreen Terrace\", \"age\": 40, \"name\": \"Homer Simpson\"})\"_json;\n    auto p2 = j2.template get<ns::person>();\n\n    // incomplete deserialization:\n    json j3 = R\"({\"address\": \"742 Evergreen Terrace\", \"name\": \"Maggie Simpson\"})\"_json;\n    try\n    {\n        auto p3 = j3.template get<ns::person>();\n    }\n    catch (const json::exception& e)\n    {\n        std::cout << \"deserialization failed: \" << e.what() << std::endl;\n    }\n}\n

    Output:

    serialization: {\"address\":\"744 Evergreen Terrace\",\"age\":60,\"name\":\"Ned Flanders\"}\ndeserialization failed: [json.exception.out_of_range.403] key 'age' not found\n

    Notes:

    • ns::person is default-constructible. This is a requirement for using the macro.
    • ns::person has only public member variables. This makes NLOHMANN_DEFINE_TYPE_NON_INTRUSIVE applicable.
    • The macro NLOHMANN_DEFINE_TYPE_NON_INTRUSIVE is used outside the class, but inside its namespace ns.
    • A missing key \"age\" in the deserialization yields an exception. To fall back to the default value, NLOHMANN_DEFINE_TYPE_NON_INTRUSIVE_WITH_DEFAULT can be used.

    The macro is equivalent to:

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\nusing namespace nlohmann::literals;\n\nnamespace ns\n{\nstruct person\n{\n    std::string name;\n    std::string address;\n    int age;\n};\n\ntemplate<typename BasicJsonType>\nvoid to_json(BasicJsonType& nlohmann_json_j, const person& nlohmann_json_t)\n{\n    nlohmann_json_j[\"name\"] = nlohmann_json_t.name;\n    nlohmann_json_j[\"address\"] = nlohmann_json_t.address;\n    nlohmann_json_j[\"age\"] = nlohmann_json_t.age;\n}\n\ntemplate<typename BasicJsonType>\nvoid from_json(const BasicJsonType& nlohmann_json_j, person& nlohmann_json_t)\n{\n    nlohmann_json_t.name = nlohmann_json_j.at(\"name\");\n    nlohmann_json_t.address = nlohmann_json_j.at(\"address\");\n    nlohmann_json_t.age = nlohmann_json_j.at(\"age\");\n}\n} // namespace ns\n\nint main()\n{\n    ns::person p = {\"Ned Flanders\", \"744 Evergreen Terrace\", 60};\n\n    // serialization: person -> json\n    json j = p;\n    std::cout << \"serialization: \" << j << std::endl;\n\n    // deserialization: json -> person\n    json j2 = R\"({\"address\": \"742 Evergreen Terrace\", \"age\": 40, \"name\": \"Homer Simpson\"})\"_json;\n    auto p2 = j2.template get<ns::person>();\n\n    // incomplete deserialization:\n    json j3 = R\"({\"address\": \"742 Evergreen Terrace\", \"name\": \"Maggie Simpson\"})\"_json;\n    try\n    {\n        auto p3 = j3.template get<ns::person>();\n    }\n    catch (const json::exception& e)\n    {\n        std::cout << \"deserialization failed: \" << e.what() << std::endl;\n    }\n}\n
    Example (2): NLOHMANN_DEFINE_TYPE_NON_INTRUSIVE_WITH_DEFAULT

    Consider the following complete example:

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\nusing namespace nlohmann::literals;\n\nnamespace ns\n{\nstruct person\n{\n    std::string name = \"John Doe\";\n    std::string address = \"123 Fake St\";\n    int age = -1;\n\n    person() = default;\n    person(std::string name_, std::string address_, int age_)\n        : name(std::move(name_)), address(std::move(address_)), age(age_)\n    {}\n};\n\nNLOHMANN_DEFINE_TYPE_NON_INTRUSIVE_WITH_DEFAULT(person, name, address, age)\n} // namespace ns\n\nint main()\n{\n    ns::person p = {\"Ned Flanders\", \"744 Evergreen Terrace\", 60};\n\n    // serialization: person -> json\n    json j = p;\n    std::cout << \"serialization: \" << j << std::endl;\n\n    // deserialization: json -> person\n    json j2 = R\"({\"address\": \"742 Evergreen Terrace\", \"age\": 40, \"name\": \"Homer Simpson\"})\"_json;\n    auto p2 = j2.template get<ns::person>();\n\n    // incomplete deserialization:\n    json j3 = R\"({\"address\": \"742 Evergreen Terrace\", \"name\": \"Maggie Simpson\"})\"_json;\n    auto p3 = j3.template get<ns::person>();\n    std::cout << \"roundtrip: \" << json(p3) << std::endl;\n}\n

    Output:

    serialization: {\"address\":\"744 Evergreen Terrace\",\"age\":60,\"name\":\"Ned Flanders\"}\nroundtrip: {\"address\":\"742 Evergreen Terrace\",\"age\":-1,\"name\":\"Maggie Simpson\"}\n

    Notes:

    • ns::person is default-constructible. This is a requirement for using the macro.
    • ns::person has only public member variables. This makes NLOHMANN_DEFINE_TYPE_NON_INTRUSIVE_WITH_DEFAULT applicable.
    • The macro NLOHMANN_DEFINE_TYPE_NON_INTRUSIVE_WITH_DEFAULT is used outside the class, but inside its namespace ns.
    • A missing key \"age\" in the deserialization does not yield an exception. Instead, the default value -1 is used.

    The macro is equivalent to:

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\nusing namespace nlohmann::literals;\n\nnamespace ns\n{\nstruct person\n{\n    std::string name = \"John Doe\";\n    std::string address = \"123 Fake St\";\n    int age = -1;\n\n    person() = default;\n    person(std::string name_, std::string address_, int age_)\n        : name(std::move(name_)), address(std::move(address_)), age(age_)\n    {}\n};\n\ntemplate<typename BasicJsonType>\nvoid to_json(BasicJsonType& nlohmann_json_j, const person& nlohmann_json_t)\n{\n    nlohmann_json_j[\"name\"] = nlohmann_json_t.name;\n    nlohmann_json_j[\"address\"] = nlohmann_json_t.address;\n    nlohmann_json_j[\"age\"] = nlohmann_json_t.age;\n}\n\ntemplate<typename BasicJsonType>\nvoid from_json(const BasicJsonType& nlohmann_json_j, person& nlohmann_json_t)\n{\n    person nlohmann_json_default_obj;\n    nlohmann_json_t.name = nlohmann_json_j.value(\"name\", nlohmann_json_default_obj.name);\n    nlohmann_json_t.address = nlohmann_json_j.value(\"address\", nlohmann_json_default_obj.address);\n    nlohmann_json_t.age = nlohmann_json_j.value(\"age\", nlohmann_json_default_obj.age);\n}\n} // namespace ns\n\nint main()\n{\n    ns::person p = {\"Ned Flanders\", \"744 Evergreen Terrace\", 60};\n\n    // serialization: person -> json\n    json j = p;\n    std::cout << \"serialization: \" << j << std::endl;\n\n    // deserialization: json -> person\n    json j2 = R\"({\"address\": \"742 Evergreen Terrace\", \"age\": 40, \"name\": \"Homer Simpson\"})\"_json;\n    auto p2 = j2.template get<ns::person>();\n\n    // incomplete deserialization:\n    json j3 = R\"({\"address\": \"742 Evergreen Terrace\", \"name\": \"Maggie Simpson\"})\"_json;\n    auto p3 = j3.template get<ns::person>();\n    std::cout << \"roundtrip: \" << json(p3) << std::endl;\n}\n

    Note how a default-initialized person object is used in the from_json to fill missing values.

    Example (3): NLOHMANN_DEFINE_TYPE_NON_INTRUSIVE_ONLY_SERIALIZE

    Consider the following complete example:

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\nusing namespace nlohmann::literals;\n\nnamespace ns\n{\nstruct person\n{\n    std::string name;\n    std::string address;\n    int age;\n};\n\nNLOHMANN_DEFINE_TYPE_NON_INTRUSIVE_ONLY_SERIALIZE(person, name, address, age)\n} // namespace ns\n\nint main()\n{\n    ns::person p = {\"Ned Flanders\", \"744 Evergreen Terrace\", 60};\n\n    // serialization: person -> json\n    json j = p;\n    std::cout << \"serialization: \" << j << std::endl;\n}\n

    Output:

    serialization: {\"address\":\"744 Evergreen Terrace\",\"age\":60,\"name\":\"Ned Flanders\"}\n

    Notes:

    • ns::person is non-default-constructible. This allows this macro to be used instead of NLOHMANN_DEFINE_TYPE_NON_INTRUSIVE and NLOHMANN_DEFINE_TYPE_NON_INTRUSIVE_WITH_DEFAULT.
    • ns::person has only public member variables. This makes NLOHMANN_DEFINE_TYPE_NON_INTRUSIVE_ONLY_SERIALIZE applicable.
    • The macro NLOHMANN_DEFINE_TYPE_NON_INTRUSIVE_ONLY_SERIALIZE is used outside the class, but inside its namespace ns.

    The macro is equivalent to:

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\nusing namespace nlohmann::literals;\n\nnamespace ns\n{\nstruct person\n{\n    std::string name;\n    std::string address;\n    int age;\n};\n\ntemplate<typename BasicJsonType>\nvoid to_json(BasicJsonType& nlohmann_json_j, const person& nlohmann_json_t)\n{\n    nlohmann_json_j[\"name\"] = nlohmann_json_t.name;\n    nlohmann_json_j[\"address\"] = nlohmann_json_t.address;\n    nlohmann_json_j[\"age\"] = nlohmann_json_t.age;\n}\n} // namespace ns\n\nint main()\n{\n    ns::person p = {\"Ned Flanders\", \"744 Evergreen Terrace\", 60};\n\n    // serialization: person -> json\n    json j = p;\n    std::cout << \"serialization: \" << j << std::endl;\n}\n
    "},{"location":"api/macros/nlohmann_define_type_non_intrusive/#see-also","title":"See also","text":"
    • NLOHMANN_DEFINE_TYPE_INTRUSIVE, NLOHMANN_DEFINE_TYPE_INTRUSIVE_WITH_DEFAULT, NLOHMANN_DEFINE_TYPE_INTRUSIVE_ONLY_SERIALIZE for a similar macro that can be defined inside the type.
    • NLOHMANN_DEFINE_DERIVED_TYPE_INTRUSIVE, NLOHMANN_DEFINE_DERIVED_TYPE_INTRUSIVE_WITH_DEFAULT, NLOHMANN_DEFINE_DERIVED_TYPE_INTRUSIVE_ONLY_SERIALIZE, NLOHMANN_DEFINE_DERIVED_TYPE_NON_INTRUSIVE, NLOHMANN_DEFINE_DERIVED_TYPE_NON_INTRUSIVE_WITH_DEFAULT, NLOHMANN_DEFINE_DERIVED_TYPE_NON_INTRUSIVE_ONLY_SERIALIZE for similar macros for derived types
    • Arbitrary Type Conversions for an overview.
    "},{"location":"api/macros/nlohmann_define_type_non_intrusive/#version-history","title":"Version history","text":"
    1. Added in version 3.9.0.
    2. Added in version 3.11.0.
    3. Added in version 3.11.3.
    "},{"location":"api/macros/nlohmann_json_namespace/","title":"NLOHMANN_JSON_NAMESPACE","text":"
    #define NLOHMANN_JSON_NAMESPACE /* value */\n

    This macro evaluates to the full name of the nlohmann namespace.

    "},{"location":"api/macros/nlohmann_json_namespace/#default-definition","title":"Default definition","text":"

    The default value consists of the root namespace (nlohmann) and an inline ABI namespace. See nlohmann Namespace for details.

    When the macro is not defined, the library will define it to its default value. Overriding this value has no effect on the library.

    "},{"location":"api/macros/nlohmann_json_namespace/#examples","title":"Examples","text":"Example

    The example shows how to use NLOHMANN_JSON_NAMESPACE instead of just nlohmann, as well as how to output the value of NLOHMANN_JSON_NAMESPACE.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\n// possible use case: use NLOHMANN_JSON_NAMESPACE instead of nlohmann\nusing json = NLOHMANN_JSON_NAMESPACE::json;\n\n// macro needed to output the NLOHMANN_JSON_NAMESPACE as string literal\n#define Q(x) #x\n#define QUOTE(x) Q(x)\n\nint main()\n{\n    std::cout << QUOTE(NLOHMANN_JSON_NAMESPACE) << std::endl;\n}\n

    Output:

    nlohmann::json_abi_v3_12_0\n
    "},{"location":"api/macros/nlohmann_json_namespace/#see-also","title":"See also","text":"
    • NLOHMANN_JSON_NAMESPACE_BEGIN, NLOHMANN_JSON_NAMESPACE_END
    • NLOHMANN_JSON_NAMESPACE_NO_VERSION
    "},{"location":"api/macros/nlohmann_json_namespace/#version-history","title":"Version history","text":"
    • Added in version 3.11.0. Changed inline namespace name in version 3.11.2.
    "},{"location":"api/macros/nlohmann_json_namespace_begin/","title":"NLOHMANN_JSON_NAMESPACE_BEGIN, NLOHMANN_JSON_NAMESPACE_END","text":"
    #define NLOHMANN_JSON_NAMESPACE_BEGIN /* value */  // (1)\n#define NLOHMANN_JSON_NAMESPACE_END   /* value */  // (2)\n

    These macros can be used to open and close the nlohmann namespace. See nlohmann Namespace for details.

    1. Opens the namespace.
    2. Closes the namespace.
    "},{"location":"api/macros/nlohmann_json_namespace_begin/#default-definition","title":"Default definition","text":"

    The default definitions open and close the nlohmann namespace. The precise definition of [NLOHMANN_JSON_NAMESPACE_BEGIN] varies as described here.

    1. Default definition of NLOHMANN_JSON_NAMESPACE_BEGIN:

      namespace nlohmann\n{\ninline namespace json_abi_v3_11_2\n{\n

    2. Default definition of NLOHMANN_JSON_NAMESPACE_END: 

      }  // namespace json_abi_v3_11_2\n}  // namespace nlohmann\n

    When these macros are not defined, the library will define them to their default definitions.

    "},{"location":"api/macros/nlohmann_json_namespace_begin/#examples","title":"Examples","text":"Example

    The example shows how to use NLOHMANN_JSON_NAMESPACE_BEGIN/NLOHMANN_JSON_NAMESPACE_END from the How do I convert third-party types? page.

    #include <iostream>\n#include <optional>\n#include <nlohmann/json.hpp>\n\n// partial specialization (see https://json.nlohmann.me/features/arbitrary_types/)\nNLOHMANN_JSON_NAMESPACE_BEGIN\ntemplate <typename T>\nstruct adl_serializer<std::optional<T>>\n{\n    static void to_json(json& j, const std::optional<T>& opt)\n    {\n        if (opt == std::nullopt)\n        {\n            j = nullptr;\n        }\n        else\n        {\n            j = *opt;\n        }\n    }\n};\nNLOHMANN_JSON_NAMESPACE_END\n\nint main()\n{\n    std::optional<int> o1 = 1;\n    std::optional<int> o2 = std::nullopt;\n\n    NLOHMANN_JSON_NAMESPACE::json j;\n    j.push_back(o1);\n    j.push_back(o2);\n    std::cout << j << std::endl;\n}\n

    Output:

    [1,null]\n
    "},{"location":"api/macros/nlohmann_json_namespace_begin/#see-also","title":"See also","text":"
    • nlohmann Namespace
    • NLOHMANN_JSON_NAMESPACE
    • NLOHMANN_JSON_NAMESPACE_NO_VERSION
    "},{"location":"api/macros/nlohmann_json_namespace_begin/#version-history","title":"Version history","text":"
    • Added in version 3.11.0. Changed inline namespace name in version 3.11.2.
    "},{"location":"api/macros/nlohmann_json_namespace_no_version/","title":"NLOHMANN_JSON_NAMESPACE_NO_VERSION","text":"
    #define NLOHMANN_JSON_NAMESPACE_NO_VERSION /* value */\n

    If defined to 1, the version component is omitted from the inline namespace. See nlohmann Namespace for details.

    "},{"location":"api/macros/nlohmann_json_namespace_no_version/#default-definition","title":"Default definition","text":"

    The default value is 0.

    #define NLOHMANN_JSON_NAMESPACE_NO_VERSION 0\n

    When the macro is not defined, the library will define it to its default value.

    "},{"location":"api/macros/nlohmann_json_namespace_no_version/#examples","title":"Examples","text":"Example

    The example shows how to use NLOHMANN_JSON_NAMESPACE_NO_VERSION to disable the version component of the inline namespace.

    #include <iostream>\n\n#define NLOHMANN_JSON_NAMESPACE_NO_VERSION 1\n#include <nlohmann/json.hpp>\n\n// macro needed to output the NLOHMANN_JSON_NAMESPACE as string literal\n#define Q(x) #x\n#define QUOTE(x) Q(x)\n\nint main()\n{\n    std::cout << QUOTE(NLOHMANN_JSON_NAMESPACE) << std::endl;\n}\n

    Output:

    nlohmann::json_abi\n
    "},{"location":"api/macros/nlohmann_json_namespace_no_version/#see-also","title":"See also","text":"
    • nlohmann Namespace
    • NLOHMANN_JSON_NAMESPACE
    • NLOHMANN_JSON_NAMESPACE_BEGIN, NLOHMANN_JSON_NAMESPACE_END
    "},{"location":"api/macros/nlohmann_json_namespace_no_version/#version-history","title":"Version history","text":"
    • Added in version 3.11.2.
    "},{"location":"api/macros/nlohmann_json_serialize_enum/","title":"NLOHMANN_JSON_SERIALIZE_ENUM","text":"
    #define NLOHMANN_JSON_SERIALIZE_ENUM(type, conversion...)\n

    By default, enum values are serialized to JSON as integers. In some cases, this could result in undesired behavior. If an enum is modified or re-ordered after data has been serialized to JSON, the later deserialized JSON data may be undefined or a different enum value than was originally intended.

    The NLOHMANN_JSON_SERIALIZE_ENUM allows to define a user-defined serialization for every enumerator.

    "},{"location":"api/macros/nlohmann_json_serialize_enum/#parameters","title":"Parameters","text":"type (in) name of the enum to serialize/deserialize conversion (in) a pair of an enumerator and a JSON serialization; arbitrary pairs can be given as a comma-separated list"},{"location":"api/macros/nlohmann_json_serialize_enum/#default-definition","title":"Default definition","text":"

    The macro adds two functions to the namespace which take care of the serialization and deserialization:

    template<typename BasicJsonType>\ninline void to_json(BasicJsonType& j, const type& e);\ntemplate<typename BasicJsonType>\ninline void from_json(const BasicJsonType& j, type& e);\n
    "},{"location":"api/macros/nlohmann_json_serialize_enum/#notes","title":"Notes","text":"

    Prerequisites

    The macro must be used inside the namespace of the enum.

    Important notes

    • When using template get<ENUM_TYPE>(), undefined JSON values will default to the first specified conversion. Select this default pair carefully. See example 1 below.
    • If an enum or JSON value is specified in multiple conversions, the first matching conversion from the top of the list will be returned when converting to or from JSON. See example 2 below.
    "},{"location":"api/macros/nlohmann_json_serialize_enum/#examples","title":"Examples","text":"Example 1: Basic usage

    The example shows how NLOHMANN_JSON_SERIALIZE_ENUM can be used to serialize/deserialize both classical enums and C++11 enum classes:

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nnamespace ns\n{\nenum TaskState\n{\n    TS_STOPPED,\n    TS_RUNNING,\n    TS_COMPLETED,\n    TS_INVALID = -1\n};\n\nNLOHMANN_JSON_SERIALIZE_ENUM(TaskState,\n{\n    { TS_INVALID, nullptr },\n    { TS_STOPPED, \"stopped\" },\n    { TS_RUNNING, \"running\" },\n    { TS_COMPLETED, \"completed\" }\n})\n\nenum class Color\n{\n    red, green, blue, unknown\n};\n\nNLOHMANN_JSON_SERIALIZE_ENUM(Color,\n{\n    { Color::unknown, \"unknown\" }, { Color::red, \"red\" },\n    { Color::green, \"green\" }, { Color::blue, \"blue\" }\n})\n} // namespace ns\n\nint main()\n{\n    // serialization\n    json j_stopped = ns::TS_STOPPED;\n    json j_red = ns::Color::red;\n    std::cout << \"ns::TS_STOPPED -> \" << j_stopped\n              << \", ns::Color::red -> \" << j_red << std::endl;\n\n    // deserialization\n    json j_running = \"running\";\n    json j_blue = \"blue\";\n    auto running = j_running.template get<ns::TaskState>();\n    auto blue = j_blue.template get<ns::Color>();\n    std::cout << j_running << \" -> \" << running\n              << \", \" << j_blue << \" -> \" << static_cast<int>(blue) << std::endl;\n\n    // deserializing undefined JSON value to enum\n    // (where the first map entry above is the default)\n    json j_pi = 3.14;\n    auto invalid = j_pi.template get<ns::TaskState>();\n    auto unknown = j_pi.template get<ns::Color>();\n    std::cout << j_pi << \" -> \" << invalid << \", \"\n              << j_pi << \" -> \" << static_cast<int>(unknown) << std::endl;\n}\n

    Output:

    ns::TS_STOPPED -> \"stopped\", ns::Color::red -> \"red\"\n\"running\" -> 1, \"blue\" -> 2\n3.14 -> -1, 3.14 -> 3\n
    Example 2: Multiple conversions for one enumerator

    The example shows how to use multiple conversions for a single enumerator. In the example, Color::red will always be serialized to \"red\", because the first occurring conversion. The second conversion, however, offers an alternative deserialization from \"rot\" to Color::red.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nnamespace ns\n{\nenum class Color\n{\n    red, green, blue, unknown\n};\n\nNLOHMANN_JSON_SERIALIZE_ENUM(Color,\n{\n    { Color::unknown, \"unknown\" }, { Color::red, \"red\" },\n    { Color::green, \"green\" }, { Color::blue, \"blue\" },\n    { Color::red, \"rot\" } // a second conversion for Color::red\n})\n}\n\nint main()\n{\n    // serialization\n    json j_red = ns::Color::red;\n    std::cout << static_cast<int>(ns::Color::red) << \" -> \" << j_red << std::endl;\n\n    // deserialization\n    json j_rot = \"rot\";\n    auto rot = j_rot.template get<ns::Color>();\n    auto red = j_red.template get<ns::Color>();\n    std::cout << j_rot << \" -> \" << static_cast<int>(rot) << std::endl;\n    std::cout << j_red << \" -> \" << static_cast<int>(red) << std::endl;\n}\n

    Output:

    0 -> \"red\"\n\"rot\" -> 0\n\"red\" -> 0\n
    "},{"location":"api/macros/nlohmann_json_serialize_enum/#see-also","title":"See also","text":"
    • Specializing enum conversion
    • JSON_DISABLE_ENUM_SERIALIZATION
    "},{"location":"api/macros/nlohmann_json_serialize_enum/#version-history","title":"Version history","text":"

    Added in version 3.4.0.

    "},{"location":"api/macros/nlohmann_json_version_major/","title":"NLOHMANN_JSON_VERSION_MAJOR, NLOHMANN_JSON_VERSION_MINOR, NLOHMANN_JSON_VERSION_PATCH","text":"
    #define NLOHMANN_JSON_VERSION_MAJOR /* value */\n#define NLOHMANN_JSON_VERSION_MINOR /* value */\n#define NLOHMANN_JSON_VERSION_PATCH /* value */\n

    These macros are defined by the library and contain the version numbers according to Semantic Versioning 2.0.0.

    "},{"location":"api/macros/nlohmann_json_version_major/#default-definition","title":"Default definition","text":"

    The macros are defined according to the current library version.

    "},{"location":"api/macros/nlohmann_json_version_major/#examples","title":"Examples","text":"Example

    The example below shows how NLOHMANN_JSON_VERSION_MAJOR, NLOHMANN_JSON_VERSION_MINOR, and NLOHMANN_JSON_VERSION_PATCH are defined by the library.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    std::cout << \"JSON for Modern C++ version \"\n              << NLOHMANN_JSON_VERSION_MAJOR << \".\"\n              << NLOHMANN_JSON_VERSION_MINOR << \".\"\n              << NLOHMANN_JSON_VERSION_PATCH << std::endl;\n}\n

    Output:

    JSON for Modern C++ version 3.12.0\n
    "},{"location":"api/macros/nlohmann_json_version_major/#see-also","title":"See also","text":"
    • meta - returns version information on the library
    • JSON_SKIP_LIBRARY_VERSION_CHECK - skip library version check
    "},{"location":"api/macros/nlohmann_json_version_major/#version-history","title":"Version history","text":"
    • Added in version 3.1.0.
    "},{"location":"community/","title":"Community","text":"
    • Code of Conduct - the rules and norms of this project
    • Contribution Guidelines - guidelines how to contribute to this project
    • Governance - the governance model of this project
    • Quality Assurance - how the quality of this project is assured
    • Security Policy - the security policy of the project
    "},{"location":"community/code_of_conduct/","title":"Contributor Covenant Code of Conduct","text":""},{"location":"community/code_of_conduct/#our-pledge","title":"Our Pledge","text":"

    We as members, contributors, and leaders pledge to make participation in our community a harassment-free experience for everyone, regardless of age, body size, visible or invisible disability, ethnicity, sex characteristics, gender identity and expression, level of experience, education, socio-economic status, nationality, personal appearance, race, caste, color, religion, or sexual identity and orientation.

    We pledge to act and interact in ways that contribute to an open, welcoming, diverse, inclusive, and healthy community.

    "},{"location":"community/code_of_conduct/#our-standards","title":"Our Standards","text":"

    Examples of behavior that contributes to a positive environment for our community include:

    • Demonstrating empathy and kindness toward other people
    • Being respectful of differing opinions, viewpoints, and experiences
    • Giving and gracefully accepting constructive feedback
    • Accepting responsibility and apologizing to those affected by our mistakes, and learning from the experience
    • Focusing on what is best not just for us as individuals, but for the overall community

    Examples of unacceptable behavior include:

    • The use of sexualized language or imagery, and sexual attention or advances of any kind
    • Trolling, insulting or derogatory comments, and personal or political attacks
    • Public or private harassment
    • Publishing others' private information, such as a physical or email address, without their explicit permission
    • Other conduct which could reasonably be considered inappropriate in a professional setting
    "},{"location":"community/code_of_conduct/#enforcement-responsibilities","title":"Enforcement Responsibilities","text":"

    Community leaders are responsible for clarifying and enforcing our standards of acceptable behavior and will take appropriate and fair corrective action in response to any behavior that they deem inappropriate, threatening, offensive, or harmful.

    Community leaders have the right and responsibility to remove, edit, or reject comments, commits, code, wiki edits, issues, and other contributions that are not aligned to this Code of Conduct, and will communicate reasons for moderation decisions when appropriate.

    "},{"location":"community/code_of_conduct/#scope","title":"Scope","text":"

    This Code of Conduct applies within all community spaces, and also applies when an individual is officially representing the community in public spaces. Examples of representing our community include using an official email address, posting via an official social media account, or acting as an appointed representative at an online or offline event.

    "},{"location":"community/code_of_conduct/#enforcement","title":"Enforcement","text":"

    Instances of abusive, harassing, or otherwise unacceptable behavior may be reported to the community leaders responsible for enforcement at mail@nlohmann.me. All complaints will be reviewed and investigated promptly and fairly.

    All community leaders are obligated to respect the privacy and security of the reporter of any incident.

    "},{"location":"community/code_of_conduct/#enforcement-guidelines","title":"Enforcement Guidelines","text":"

    Community leaders will follow these Community Impact Guidelines in determining the consequences for any action they deem in violation of this Code of Conduct:

    "},{"location":"community/code_of_conduct/#1-correction","title":"1. Correction","text":"

    Community Impact: Use of inappropriate language or other behavior deemed unprofessional or unwelcome in the community.

    Consequence: A private, written warning from community leaders, providing clarity around the nature of the violation and an explanation of why the behavior was inappropriate. A public apology may be requested.

    "},{"location":"community/code_of_conduct/#2-warning","title":"2. Warning","text":"

    Community Impact: A violation through a single incident or series of actions.

    Consequence: A warning with consequences for continued behavior. No interaction with the people involved, including unsolicited interaction with those enforcing the Code of Conduct, for a specified period of time. This includes avoiding interactions in community spaces as well as external channels like social media. Violating these terms may lead to a temporary or permanent ban.

    "},{"location":"community/code_of_conduct/#3-temporary-ban","title":"3. Temporary Ban","text":"

    Community Impact: A serious violation of community standards, including sustained inappropriate behavior.

    Consequence: A temporary ban from any sort of interaction or public communication with the community for a specified period of time. No public or private interaction with the people involved, including unsolicited interaction with those enforcing the Code of Conduct, is allowed during this period. Violating these terms may lead to a permanent ban.

    "},{"location":"community/code_of_conduct/#4-permanent-ban","title":"4. Permanent Ban","text":"

    Community Impact: Demonstrating a pattern of violation of community standards, including sustained inappropriate behavior, harassment of an individual, or aggression toward or disparagement of classes of individuals.

    Consequence: A permanent ban from any sort of public interaction within the community.

    "},{"location":"community/code_of_conduct/#attribution","title":"Attribution","text":"

    This Code of Conduct is adapted from the Contributor Covenant, version 2.1, available at https://www.contributor-covenant.org/version/2/1/code_of_conduct.html.

    Community Impact Guidelines were inspired by Mozilla's code of conduct enforcement ladder.

    For answers to common questions about this code of conduct, see the FAQ at https://www.contributor-covenant.org/faq. Translations are available at https://www.contributor-covenant.org/translations.

    "},{"location":"community/contribution_guidelines/","title":"Contribution Guidelines","text":"

    Thank you for your interest in contributing to this project! What began as an exercise to explore the exciting features of C++11 has evolved into a widely used JSON library. I truly appreciate all the contributions from the community, whether it's proposing features, identifying bugs, or fixing mistakes! To ensure that our collaboration is efficient and effective, please follow these guidelines.

    Feel free to discuss or suggest improvements to this document by submitting a pull request.

    "},{"location":"community/contribution_guidelines/#ways-to-contribute","title":"Ways to Contribute","text":"

    There are multiple ways to contribute.

    "},{"location":"community/contribution_guidelines/#reporting-an-issue","title":"Reporting an issue","text":"

    Please create an issue, assuming one does not already exist, and describe your concern. Note you need a GitHub account for this.

    Clearly describe the issue:

    • If it is a bug, please describe how to reproduce it. If possible, attach a complete example which demonstrates the error. Please also state what you expected to happen instead of the error.
    • If you propose a change or addition, try to give an example what the improved code could look like or how to use it.
    • If you found a compilation error, please tell us which compiler (version and operating system) you used and paste the (relevant part of) the error messages to the ticket.

    Please stick to the provided issue template bug report if possible.

    "},{"location":"community/contribution_guidelines/#reporting-a-security-vulnerability","title":"Reporting a security vulnerability","text":"

    You can report a security vulnerability according to our security policy.

    "},{"location":"community/contribution_guidelines/#discussing-a-new-feature","title":"Discussing a new feature","text":"

    For questions, feature or support requests, please open a discussion. If you find a proposed answer satisfactory, please use the \"Mark as answer\" button to make it easier for readers to see what helped and for the community to filter for open questions.

    "},{"location":"community/contribution_guidelines/#proposing-a-fix-or-an-improvement","title":"Proposing a fix or an improvement","text":"

    Join an ongoing discussion or comment on an existing issue before starting to code. This can help to avoid duplicate efforts or other frustration during the later review.

    Create a pull request against the develop branch and follow the pull request template. In particular,

    • describe the changes in detail, both the what and why,
    • reference existing issues where applicable,
    • add tests to maintain 100% test coverage,
    • update the documentation as needed, and
    • ensure the source code is amalgamated.

    We describe all points in detail below.

    All contributions (including pull requests) must agree to the Developer Certificate of Origin (DCO) version 1.1. This is exactly the same one created and used by the Linux kernel developers and posted on http://developercertificate.org/. This is a developer's certification that he or she has the right to submit the patch for inclusion into the project.

    "},{"location":"community/contribution_guidelines/#how-to","title":"How to...","text":""},{"location":"community/contribution_guidelines/#describe-your-changes","title":"Describe your changes","text":"

    This library is primarily maintained as a spare-time project. As such, I cannot make any guarantee how quickly changes are merged and released. Therefore, it is very important to make the review as smooth as possible by explaining not only what you changed, but why. This rationale can be very valuable down the road when improvements or bugs are discussed years later.

    "},{"location":"community/contribution_guidelines/#reference-an-existing-issue","title":"Reference an existing issue","text":"

    Link a pull request to an issue to clarify that a fix is forthcoming and which issue can be closed after merging. Only a few cases (e.g., fixing typos) do not require prior discussions.

    "},{"location":"community/contribution_guidelines/#write-tests","title":"Write tests","text":"

    The library has an extensive test suite that currently covers 100 % of the library's code. These tests are crucial to maintain API stability and give future contributors confidence that they do not accidentally break things. As Titus Winters aptly put it:

    If you liked it, you should have put a test on it.

    "},{"location":"community/contribution_guidelines/#run-the-tests","title":"Run the tests","text":"

    First, ensure the test suite runs before making any changes:

    $ cmake -S. -B build\n$ cmake --build build -j 10\n$ ctest --test-dir build -j 10\n

    The test suite should report:

    100% tests passed, 0 tests failed out of 98\n
    "},{"location":"community/contribution_guidelines/#add-tests","title":"Add tests","text":"

    The tests are located in tests/src/unit-*.cpp and contain doctest assertions like CHECK. The tests are structured along the features of the library or the nature of the tests. Usually, it should be clear from the context which existing file needs to be extended, and only very few cases require creating new test files.

    When fixing a bug, edit unit-regression2.cpp and add a section referencing the fixed issue.

    "},{"location":"community/contribution_guidelines/#exceptions","title":"Exceptions","text":"

    When you test exceptions, please use CHECK_THROWS_WITH_AS which also takes the what() argument of the thrown exception into account.

    "},{"location":"community/contribution_guidelines/#coverage","title":"Coverage","text":"

    If test coverage decreases, an automatic warning comment will be posted on the pull request. You can access a code coverage report as an artifact to the \u201cUbuntu\u201d workflow.

    "},{"location":"community/contribution_guidelines/#update-the-documentation","title":"Update the documentation","text":"

    The main documentation of the library is generated from the files docs/mkdocs/docs. This folder contains dedicated pages for certain features, a list of all exceptions, and extensive API documentation with details on every public API function.

    Build the documentation locally using:

    make install_venv -C docs/mkdocs\nmake serve -C docs/mkdocs\n

    The documentation will then be available at http://127.0.0.1:8000/. See the documentation of mkdocs and Material for MkDocs for more information.

    "},{"location":"community/contribution_guidelines/#amalgamate-the-source-code","title":"Amalgamate the source code","text":"

    The single-header files single_include/nlohmann/json.hpp and single_include/nlohmann/json_fwd.hpp are generated from the source files in the include/nlohmann directory. Do not edit the files directly; instead, modify the include/nlohmann sources and regenerate the files by executing:

    make amalgamate\n
    "},{"location":"community/contribution_guidelines/#recommended-documentation","title":"Recommended documentation","text":"
    • The library\u2019s README file is an excellent starting point to understand its functionality.
    • The documentation page is the reference documentation of the library.
    • RFC 8259 is the reference for the JavaScript Object Notation (JSON) Data Interchange Format.
    "},{"location":"community/contribution_guidelines/#please-dont","title":"Please don't...","text":"

    Certain contributions are not helpful.

    "},{"location":"community/contribution_guidelines/#break-the-public-api","title":"Break the public API","text":"

    We take pride in the library being used by numerous customers across various industries. They all rely on the guarantees provided by semantic versioning. Please do not change the library such that the public API of the 3.x.y version is broken. This includes:

    • Changing function signatures (altering parameter types, return types, number of parameters) or changing the const-ness of member functions.
    • Removing functions.
    • Renaming functions or classes.
    • Changing exception handling.
    • Changing exception ids.
    • Changing access specifiers.
    • Changing default arguments.

    Although these guidelines may seem restrictive, they are essential for maintaining the library\u2019s utility.

    Breaking changes may be introduced when they are guarded with a feature macro such as JSON_USE_IMPLICIT_CONVERSIONS which allows selectively changing the behavior of the library. In next steps, the current behavior can then be deprecated. Using feature macros then allows users to test their code against the library in the next major release.

    "},{"location":"community/contribution_guidelines/#break-c11-language-conformance","title":"Break C++11 language conformance","text":"

    This library is designed to work with C++11 and later. This means that any supported C++11 compiler should compile the library without problems. Some compilers like GCC 4.7 (and earlier), Clang 3.3 (and earlier), or Microsoft Visual Studio 13.0 and earlier are known not to work due to missing or incomplete C++11 support.

    Please do not add features that do not work with the mentioned supported compilers. Please guard features from C++14 and later against the respective JSON_HAS_CPP_14 macros.

    "},{"location":"community/contribution_guidelines/#break-json-conformance","title":"Break JSON conformance","text":"

    Please refrain from proposing changes that would break JSON conformance. If you propose a conformant extension of JSON to be supported by the library, please motivate this extension.

    "},{"location":"community/contribution_guidelines/#wanted","title":"Wanted","text":"

    The following areas really need contribution and are always welcomed:

    • Extending the continuous integration toward more exotic compilers such as Android NDK, Intel's Compiler, or the bleeding-edge versions Clang.
    • Improving the efficiency of the JSON parser. The current parser is implemented as a naive recursive descent parser with hand-coded string handling. More sophisticated approaches like LALR parsers would be really appreciated. That said, parser generators like Bison or ANTLR do not play nice with single-header files -- I really would like to keep the parser inside the json.hpp header, and I am not aware of approaches similar to re2c for parsing.
    • Extending and updating existing benchmarks to include (the most recent version of) this library. Though efficiency is not everything, speed and memory consumption are very important characteristics for C++ developers, so having proper comparisons would be interesting.

    We look forward to your contributions and collaboration to enhance the library!

    "},{"location":"community/governance/","title":"Governance","text":"

    The governance model for the JSON for Modern C++ project is a Benevolent Dictator for Life (BDFL) structure. As the sole maintainer, Niels Lohmann is responsible for all key aspects of the project. The project governance may evolve as the project grows, but any changes will be documented here and communicated to contributors.

    "},{"location":"community/governance/#overview","title":"Overview","text":"

    This project is led by a benevolent dictator, Niels Lohmann, and managed by the community. That is, the community actively contributes to the day-to-day maintenance of the project, but the general strategic line is drawn by the benevolent dictator. In case of disagreement, they have the last word. It is the benevolent dictator\u2019s job to resolve disputes within the community and to ensure that the project is able to progress in a coordinated way. In turn, it is the community\u2019s job to guide the decisions of the benevolent dictator through active engagement and contribution.

    "},{"location":"community/governance/#roles-and-responsibilities","title":"Roles and responsibilities","text":""},{"location":"community/governance/#benevolent-dictator-project-lead","title":"Benevolent dictator (project lead)","text":"

    Typically, the benevolent dictator, or project lead, is self-appointed. However, because the community always has the ability to fork, this person is fully answerable to the community. The project lead\u2019s role is a difficult one: they set the strategic objectives of the project and communicate these clearly to the community. They also have to understand the community as a whole and strive to satisfy as many conflicting needs as possible, while ensuring that the project survives in the long term.

    In many ways, the role of the benevolent dictator is less about dictatorship and more about diplomacy. The key is to ensure that, as the project expands, the right people are given influence over it and the community rallies behind the vision of the project lead. The lead\u2019s job is then to ensure that the committers (see below) make the right decisions on behalf of the project. Generally speaking, as long as the committers are aligned with the project\u2019s strategy, the project lead will allow them to proceed as they desire.

    "},{"location":"community/governance/#committers","title":"Committers","text":"

    Committers are contributors who have made several valuable contributions to the project and are now relied upon to both write code directly to the repository and screen the contributions of others. In many cases they are programmers but it is also possible that they contribute in a different role. Typically, a committer will focus on a specific aspect of the project, and will bring a level of expertise and understanding that earns them the respect of the community and the project lead. The role of committer is not an official one, it is simply a position that influential members of the community will find themselves in as the project lead looks to them for guidance and support.

    Committers have no authority over the overall direction of the project. However, they do have the ear of the project lead. It is a committer\u2019s job to ensure that the lead is aware of the community\u2019s needs and collective objectives, and to help develop or elicit appropriate contributions to the project. Often, committers are given informal control over their specific areas of responsibility, and are assigned rights to directly modify certain areas of the source code. That is, although committers do not have explicit decision-making authority, they will often find that their actions are synonymous with the decisions made by the lead.

    "},{"location":"community/governance/#contributors","title":"Contributors","text":"

    Contributors are community members who either have no desire to become committers, or have not yet been given the opportunity by the benevolent dictator. They make valuable contributions, such as those outlined in the list below, but generally do not have the authority to make direct changes to the project code. Contributors engage with the project through communication tools, such as email lists, and via reports and patches attached to issues in the issue tracker, as detailed in our community tools document.

    Anyone can become a contributor. There is no expectation of commitment to the project, no specific skill requirements and no selection process. To become a contributor, a community member simply has to perform one or more actions that are beneficial to the project.

    Some contributors will already be engaging with the project as users, but will also find themselves doing one or more of the following:

    • supporting new users (current users often provide the most effective new user support)
    • reporting bugs
    • identifying requirements
    • supplying graphics and web design
    • programming
    • assisting with project infrastructure
    • writing documentation
    • fixing bugs
    • adding features

    As contributors gain experience and familiarity with the project, they may find that the project lead starts relying on them more and more. When this begins to happen, they gradually adopt the role of committer, as described above.

    "},{"location":"community/governance/#users","title":"Users","text":"

    Users are community members who have a need for the project. They are the most important members of the community: without them, the project would have no purpose. Anyone can be a user; there are no specific requirements.

    Users should be encouraged to participate in the life of the project and the community as much as possible. User contributions enable the project team to ensure that they are satisfying the needs of those users. Common user activities include (but are not limited to):

    • evangelising about the project
    • informing developers of project strengths and weaknesses from a new user\u2019s perspective
    • providing moral support (a \u2018thank you\u2019 goes a long way)
    • providing financial support

    Users who continue to engage with the project and its community will often find themselves becoming more and more involved. Such users may then go on to become contributors, as described above.

    "},{"location":"community/governance/#support","title":"Support","text":"

    All participants in the community are encouraged to provide support for new users within the project management infrastructure. This support is provided as a way of growing the community. Those seeking support should recognise that all support activity within the project is voluntary and is therefore provided as and when time allows. A user requiring guaranteed response times or results should therefore seek to purchase a support contract from a vendor. (Of course, that vendor should be an active member of the community.) However, for those willing to engage with the project on its own terms, and willing to help support other users, the community support channels are ideal.

    "},{"location":"community/governance/#contribution-process","title":"Contribution Process","text":"

    Anyone can contribute to the project, regardless of their skills, as there are many ways to contribute. For instance, a contributor might be active on the project mailing list and issue tracker, or might supply patches. The various ways of contributing are described in more detail in our roles in open source document.

    The developer mailing list is the most appropriate place for a contributor to ask for help when making their first contribution.

    "},{"location":"community/governance/#decision-making-process","title":"Decision-Making Process","text":"

    The benevolent dictatorship model does not need a formal conflict resolution process, since the project lead\u2019s word is final. If the community chooses to question the wisdom of the actions of a committer, the project lead can review their decisions by checking the email archives, and either uphold or reverse them.

    Source

    The text was taken from http://oss-watch.ac.uk/resources/benevolentdictatorgovernancemodel.

    "},{"location":"community/quality_assurance/","title":"Quality assurance","text":"

    Ensuring quality is paramount for this project, particularly because numerous other projects depend on it. Each commit to the library undergoes rigorous checks against the following requirements, and any violations will result in a failed build.

    "},{"location":"community/quality_assurance/#c-language-compliance-and-compiler-compatibility","title":"C++ language compliance and compiler compatibility","text":"

    Requirement: Compiler support

    Any compiler with complete C++11 support can compile the library without warnings.

    • The library is compiled with 50+ different C++ compilers with different operating systems and platforms, including the oldest versions known to compile the library.

      Compilers used in continuous integration Compiler Architecture Operating System CI AppleClang 14.0.0.14000029; Xcode 14.1 x86_64 macOS 13.7.2 (Ventura) GitHub AppleClang 14.0.0.14000029; Xcode 14.2 x86_64 macOS 13.7.2 (Ventura) GitHub AppleClang 14.0.3.14030022; Xcode 14.3.1 x86_64 macOS 13.7.2 (Ventura) GitHub AppleClang 15.0.0.15000040; Xcode 15.0.1 x86_64 macOS 13.7.2 (Ventura) GitHub AppleClang 15.0.0.15000100; Xcode 15.1 x86_64 macOS 13.7.2 (Ventura) GitHub AppleClang 15.0.0.15000100; Xcode 15.2 x86_64 macOS 13.7.2 (Ventura) GitHub AppleClang 15.0.0.15000309; Xcode 15.3 arm64 macOS 14.7.2 (Sonoma) GitHub AppleClang 15.0.0.15000309; Xcode 15.4 arm64 macOS 14.7.2 (Sonoma) GitHub AppleClang 16.0.0.16000026; Xcode 16 arm64 macOS 15.2 (Sequoia) GitHub AppleClang 16.0.0.16000026; Xcode 16.1 arm64 macOS 15.2 (Sequoia) GitHub AppleClang 16.0.0.16000026; Xcode 16.2 arm64 macOS 15.2 (Sequoia) GitHub AppleClang 17.0.0.17000013; Xcode 16.3 arm64 macOS 15.5 (Sequoia) GitHub Clang 3.5.2 x86_64 Ubuntu 22.04.1 LTS GitHub Clang 3.6.2 x86_64 Ubuntu 22.04.1 LTS GitHub Clang 3.7.1 x86_64 Ubuntu 22.04.1 LTS GitHub Clang 3.8.1 x86_64 Ubuntu 22.04.1 LTS GitHub Clang 3.9.1 x86_64 Ubuntu 22.04.1 LTS GitHub Clang 4.0.1 x86_64 Ubuntu 22.04.1 LTS GitHub Clang 5.0.2 x86_64 Ubuntu 22.04.1 LTS GitHub Clang 6.0.1 x86_64 Ubuntu 22.04.1 LTS GitHub Clang 7.1.0 x86_64 Ubuntu 22.04.1 LTS GitHub Clang 8.0.1 x86_64 Ubuntu 22.04.1 LTS GitHub Clang 9.0.1 x86_64 Ubuntu 22.04.1 LTS GitHub Clang 10.0.1 x86_64 Ubuntu 22.04.1 LTS GitHub Clang 11.0.0 with GNU-like command-line x86_64 Windows 10 (Build 17763) GitHub Clang 11.1.0 x86_64 Ubuntu 22.04.1 LTS GitHub Clang 12.0.0 with GNU-like command-line x86_64 Windows 10 (Build 17763) GitHub Clang 12.0.0 with MSVC-like command-line x86_64 Windows 10 (Build 17763) GitHub Clang 12.0.1 x86_64 Ubuntu 22.04.1 LTS GitHub Clang 13.0.0 with GNU-like command-line x86_64 Windows 10 (Build 17763) GitHub Clang 13.0.1 x86_64 Ubuntu 22.04.1 LTS GitHub Clang 14.0.0 with GNU-like command-line x86_64 Windows 10 (Build 17763) GitHub Clang 14.0.6 x86_64 Ubuntu 22.04.1 LTS GitHub Clang 15.0.0 with GNU-like command-line x86_64 Windows 10 (Build 17763) GitHub Clang 15.0.7 x86_64 Ubuntu 22.04.1 LTS GitHub Clang 16.0.6 x86_64 Ubuntu 22.04.1 LTS GitHub Clang 17.0.6 x86_64 Ubuntu 22.04.1 LTS GitHub Clang 18.1.8 x86_64 Ubuntu 22.04.1 LTS GitHub Clang 19.1.7 x86_64 Ubuntu 22.04.1 LTS GitHub Clang 20.1.1 x86_64 Ubuntu 22.04.1 LTS GitHub Clang 21.0.0 x86_64 Ubuntu 22.04.1 LTS GitHub Emscripten 4.0.6 x86_64 Ubuntu 22.04.1 LTS GitHub GNU 4.8.5 x86_64 Ubuntu 22.04.1 LTS GitHub GNU 4.9.3 x86_64 Ubuntu 22.04.1 LTS GitHub GNU 5.5.0 x86_64 Ubuntu 22.04.1 LTS GitHub GNU 6.4.0 x86_64 Ubuntu 22.04.1 LTS GitHub GNU 7.5.0 x86_64 Ubuntu 22.04.1 LTS GitHub GNU 8.5.0 x86_64 Ubuntu 22.04.1 LTS GitHub GNU 9.3.0 x86_64 Ubuntu 22.04.1 LTS GitHub GNU 9.4.0 x86_64 Ubuntu 22.04.1 LTS GitHub GNU 9.5.0 x86_64 Ubuntu 22.04.1 LTS GitHub GNU 10.5.0 x86_64 Ubuntu 22.04.1 LTS GitHub GNU 11.4.0 x86_64 Ubuntu 22.04.1 LTS GitHub GNU 11.5.0 x86_64 Ubuntu 22.04.1 LTS GitHub GNU 12.2.0 (MinGW-W64 i686-ucrt-posix-dwarf) x86_64 Windows 10 (Build 17763) GitHub GNU 12.2.0 (MinGW-W64 x86_64-ucrt-posix-seh) x86_64 Windows 10 (Build 17763) GitHub GNU 12.4.0 x86_64 Ubuntu 22.04.1 LTS GitHub GNU 13.3.0 x86_64 Ubuntu 22.04.1 LTS GitHub GNU 14.2.0 x86_64 Ubuntu 22.04.1 LTS GitHub GNU 14.2.0 arm64 Linux 6.1.100 Cirrus CI GNU 15.1.0 x86_64 Ubuntu 22.04.1 LTS GitHub icpc (ICC) 2021.5.0 20211109 x86_64 Ubuntu 20.04.3 LTS GitHub MSVC 19.0.24241.7 x86 Windows 8.1 AppVeyor MSVC 19.16.27035.0 x86 Windows-10 (Build 14393) AppVeyor MSVC 19.29.30157.0 x86 Windows 10 (Build 17763) GitHub MSVC 19.29.30157.0 x86_64 Windows 10 (Build 17763) GitHub MSVC 19.29.30157.0 x86 Windows-10 (Build 17763) AppVeyor MSVC 19.42.34435.0 x86 Windows 10 (Build 20348) GitHub MSVC 19.42.34435.0 x86_64 Windows 10 (Build 20348) GitHub

    • The library is compiled with all C++ language revisions (C++11, C++14, C++17, C++20, C++23, and C++26) to detect and fix language deprecations early.

    • The library is checked for compiler warnings:

    • On Clang, -Weverything is used with 7 exceptions.

      Clang warnings 
      # Ignored Clang warnings:\n# -Wno-c++98-compat               The library targets C++11.\n# -Wno-c++98-compat-pedantic      The library targets C++11.\n# -Wno-deprecated-declarations    The library contains annotations for deprecated functions.\n# -Wno-extra-semi-stmt            The library uses assert which triggers this warning.\n# -Wno-padded                     We do not care about padding warnings.\n# -Wno-covered-switch-default     All switches list all cases and a default case.\n# -Wno-unsafe-buffer-usage        Otherwise Doctest would not compile.\n\nset(CLANG_CXXFLAGS\n    -Werror\n    -Weverything\n    -Wno-c++98-compat\n    -Wno-c++98-compat-pedantic\n    -Wno-deprecated-declarations\n    -Wno-extra-semi-stmt\n    -Wno-padded\n    -Wno-covered-switch-default\n    -Wno-unsafe-buffer-usage\n)\n

    • On GCC, 300+ warnings are enabled with 8 exceptions.

      GCC warnings 
      # Warning flags determined for GCC 15.1.0 with https://github.com/nlohmann/gcc_flags:\n# Ignored GCC warnings:\n# -Wno-abi-tag           We do not care about ABI tags.\n# -Wno-aggregate-return  The library uses aggregate returns.\n# -Wno-long-long         The library uses the long long type to interface with system functions.\n# -Wno-namespaces        The library uses namespaces.\n# -Wno-nrvo              Doctest triggers this warning.\n# -Wno-padded            We do not care about padding warnings.\n# -Wno-system-headers    We do not care about warnings in system headers.\n# -Wno-templates         The library uses templates.\n\nset(GCC_CXXFLAGS\n    -pedantic\n    -Werror\n    --all-warnings\n    --extra-warnings\n    -W\n    -WNSObject-attribute\n    -Wno-abi-tag\n    -Waddress\n    -Waddress-of-packed-member\n    -Wno-aggregate-return\n    -Waggressive-loop-optimizations\n    -Waligned-new=all\n    -Wall\n    -Walloc-size\n    -Walloc-zero\n    -Walloca\n    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-Wunused\n    -Wunused-but-set-parameter\n    -Wunused-but-set-variable\n    -Wunused-const-variable=2\n    -Wunused-function\n    -Wunused-label\n    -Wunused-local-typedefs\n    -Wunused-macros\n    -Wunused-parameter\n    -Wunused-result\n    -Wunused-value\n    -Wunused-variable\n    -Wuse-after-free=3\n    -Wuseless-cast\n    -Wvarargs\n    -Wvariadic-macros\n    -Wvector-operation-performance\n    -Wvexing-parse\n    -Wvirtual-inheritance\n    -Wvirtual-move-assign\n    -Wvla\n    -Wvla-parameter\n    -Wvolatile\n    -Wvolatile-register-var\n    -Wwrite-strings\n    -Wxor-used-as-pow\n    -Wzero-as-null-pointer-constant\n    -Wzero-length-bounds\n)\n
    "},{"location":"community/quality_assurance/#c-standard-library-compliance","title":"C++ standard library compliance","text":"

    Requirement: No prerequisites

    The library has no prerequisites other than the Standard Template Library (STL).

    • The library is compiled and tested with both libc++ and libstdc++ to detect subtle differences or incompatibilities.
    • The code checked with Include What You Use (IWYU) that all required standard headers are included.
    • On Windows, the library is compiled with <Windows.h> being included to detect and avoid common bugs.
    • The library is compiled with exceptions disabled to support alternative means of error handling.
    "},{"location":"community/quality_assurance/#stable-public-api","title":"Stable public API","text":"

    Requirement: Stable public API

    Any change to the library does not break the public API.

    • All public API functions are tested with a variety of arguments.
    • The library is compiled and tested with different template arguments for number, string, array, and object types.
    • Unit tests cover all lines of the code base.
    • Every exception of the library is thrown in the test suite, and the error messages and exception ids are checked.

    Requirement: Complete documentation

    The public API is extensively documented.

    • Every public API function has a dedicated page in the API reference documentation with a self-contained code example.
    • All examples in the documentation are tested, and changes in their output are treated as an error.
    "},{"location":"community/quality_assurance/#robust-input-processing","title":"Robust input processing","text":"

    Requirement: Standards compliance

    The library is compliant to JSON as defined in RFC 8259.

    • The lexer is tested with all valid Unicode code points and all prefixes of all invalid Unicode code points.
    • The parser is tested against extensive correctness suites for JSON compliance.
    • In addition, the library is continuously fuzz-tested at OSS-Fuzz where the library is checked against billions of inputs.
    "},{"location":"community/quality_assurance/#static-analysis","title":"Static analysis","text":"

    Requirement: State-of-the-art code analysis

    The code is checked with state-of-the-art static code analysis tools.

    • The code is checked with the latest Clang-Tidy.

      Clang-Tidy configuration (.clang-tidy) 
      # TODO: The first three checks are only removed to get the CI going. They have to be addressed at some point.\n# TODO: portability-avoid-pragma-once: should be fixed eventually\n\nChecks: '*,\n\n         -portability-template-virtual-member-function,\n         -bugprone-use-after-move,\n         -hicpp-invalid-access-moved,\n\n         -altera-id-dependent-backward-branch,\n         -altera-struct-pack-align,\n         -altera-unroll-loops,\n         -android-cloexec-fopen,\n         -boost-use-ranges,\n         -bugprone-easily-swappable-parameters,\n         -cert-err58-cpp,\n         -clang-analyzer-webkit.NoUncountedMemberChecker,\n         -concurrency-mt-unsafe,\n         -cppcoreguidelines-avoid-const-or-ref-data-members,\n         -cppcoreguidelines-avoid-do-while,\n         -cppcoreguidelines-avoid-goto,\n         -cppcoreguidelines-avoid-magic-numbers,\n         -cppcoreguidelines-avoid-non-const-global-variables,\n         -cppcoreguidelines-macro-usage,\n         -cppcoreguidelines-pro-bounds-array-to-pointer-decay,\n         -cppcoreguidelines-pro-bounds-constant-array-index,\n         -cppcoreguidelines-pro-bounds-pointer-arithmetic,\n         -cppcoreguidelines-pro-type-reinterpret-cast,\n         -cppcoreguidelines-pro-type-union-access,\n         -cppcoreguidelines-rvalue-reference-param-not-moved,\n         -cppcoreguidelines-virtual-class-destructor,\n         -fuchsia-default-arguments-calls,\n         -fuchsia-default-arguments-declarations,\n         -fuchsia-overloaded-operator,\n         -google-explicit-constructor,\n         -google-readability-function-size,\n         -google-runtime-int,\n         -google-runtime-references,\n         -hicpp-avoid-goto,\n         -hicpp-explicit-conversions,\n         -hicpp-function-size,\n         -hicpp-no-array-decay,\n         -hicpp-no-assembler,\n         -hicpp-signed-bitwise,\n         -hicpp-uppercase-literal-suffix,\n         -llvm-header-guard,\n         -llvm-include-order,\n         -llvmlibc-*,\n         -misc-use-anonymous-namespace,\n         -misc-confusable-identifiers,\n         -misc-include-cleaner,\n         -misc-no-recursion,\n         -misc-non-private-member-variables-in-classes,\n         -modernize-concat-nested-namespaces,\n         -modernize-type-traits,\n         -modernize-use-constraints,\n         -modernize-use-designated-initializers,\n         -modernize-use-nodiscard,\n         -modernize-use-ranges,\n         -modernize-use-std-numbers,\n         -modernize-use-trailing-return-type,\n         -performance-enum-size,\n         -portability-avoid-pragma-once,\n         -readability-function-cognitive-complexity,\n         -readability-function-size,\n         -readability-identifier-length,\n         -readability-magic-numbers,\n         -readability-redundant-access-specifiers,\n         -readability-simplify-boolean-expr,\n         -readability-uppercase-literal-suffix'\n\nCheckOptions:\n  - key: hicpp-special-member-functions.AllowSoleDefaultDtor\n    value: 1\n\nWarningsAsErrors: '*'\n\n#HeaderFilterRegex: '.*nlohmann.*'\nHeaderFilterRegex: '.*hpp$'\n

    • The code is checked with the latest Cppcheck with all warnings enabled.

    • The code is checked with the latest Clang Static Analyzer with 89 enabled rules.
    • The code is checked with Infer.
    • The code is checked with Codacy.
    "},{"location":"community/quality_assurance/#dynamic-analysis","title":"Dynamic analysis","text":"

    Requirement: Correctness

    The library is checked for memory correctness and absence of undefined behavior.

    • The test suite is executed with enabled runtime assertions to check invariants and preconditions of functions to detect undefined behavior.
    • The test suite is executed with Valgrind (Memcheck) to detect memory leaks.
    • The test suite is executed with Sanitizers (address sanitizer, undefined behavior sanitizer, integer overflow detection, nullability violations).
    "},{"location":"community/quality_assurance/#style-check","title":"Style check","text":"

    Requirement: Common code style

    A common code style is used throughout all code files of the library.

    • The code is formatted with Artistic Style (astyle) against a style configuration that is also enforced in the CI.

      Astyle configuration (tools/astyle/.astylerc) 
      # Configuration for Artistic Style\n# see https://astyle.sourceforge.net/astyle.html\n\n#######################\n# Brace Style Options #\n#######################\n\n# use Allman style for braces\n--style=allman\n\n###############\n# Tab Options #\n###############\n\n# indent using 4 spaces\n--indent=spaces=4\n\n#######################\n# Indentation Options #\n#######################\n\n# indent access modifiers one half indent\n--indent-modifiers\n\n# indent switch cases to the switch block\n--indent-switches\n\n# indent preprocessor blocks\n--indent-preproc-block\n\n# indent preprocessor defines\n--indent-preproc-define\n\n# indent C++ comments\n--indent-col1-comments\n\n###################\n# Padding Options #\n###################\n\n# insert space padding around operators\n--pad-oper\n\n# insert space between if/for/while... and the following parentheses\n--pad-header\n\n# attach the pointer to the variable type (left)\n--align-pointer=type\n\n# attach the reference to the variable type (left)\n--align-reference=type\n\n######################\n# Formatting Options #\n######################\n\n# add braces to unbraced one line conditional statements\n--add-braces\n\n# convert tabs to spaces\n--convert-tabs\n\n# closes whitespace between the ending angle brackets of template definitions\n--close-templates\n\n#################\n# Other Options #\n#################\n\n# do not create backup files\n--suffix=none\n\n# preserve the original file date\n--preserve-date\n\n# display only the files that have been formatted\n--formatted\n\n# for the linux (LF) line end style\n--lineend=linux\n

    • The code style is checked with cpplint with 61 enabled rules.

    "},{"location":"community/quality_assurance/#simple-integration","title":"Simple integration","text":"

    Requirement: Single header

    The library can be used by adding a single header to a C++ project.

    • An amalgamation script is used to check if the source code is exposed as a self-contained single-header file.
    • The test suite is checked against the amalgamated source file as well as the individual source file.

    Requirement: CMake as primary development tool

    All library functions are exposed and usable by CMake.

    • All library options are exposed as CMake options and tested.
    • The library is tested against relevant CMake versions:
    • CMake 3.5 (the earliest supported)
    • CMake 3.31.6 (the latest 3.x release)
    • CMake 4.0.0 (a very recent release)
    "},{"location":"community/security_policy/","title":"Security Policy","text":""},{"location":"community/security_policy/#reporting-a-vulnerability","title":"Reporting a Vulnerability","text":"

    We value the security of our users and appreciate your efforts to responsibly disclose vulnerabilities. If you have identified a security vulnerability in this repository, please use the GitHub Security Advisory \"Report a Vulnerability\" tab.

    Until it is published, this draft security advisory will only be visible to the maintainers of this project. Other users and teams may be added once the advisory is created.

    We will send a response indicating the next steps in handling your report. After the initial reply to your report, we will keep you informed of the progress towards a fix and full announcement and may ask for additional information or guidance.

    For vulnerabilities in third-party dependencies or modules, please report them directly to the respective maintainers.

    "},{"location":"community/security_policy/#additional-resources","title":"Additional Resources","text":"
    • Explore security-related topics and contribute to tools and projects through GitHub Security Lab.
    • Learn more about responsible disclosure and reporting vulnerabilities in GitHub at About coordinated disclosure of security vulnerabilities.

    We sincerely thank you for contributing to the security and integrity of this project!

    "},{"location":"features/arbitrary_types/","title":"Arbitrary Type Conversions","text":"

    Every type can be serialized in JSON, not just STL containers and scalar types. Usually, you would do something along those lines:

    namespace ns {\n    // a simple struct to model a person\n    struct person {\n        std::string name;\n        std::string address;\n        int age;\n    };\n} // namespace ns\n\nns::person p = {\"Ned Flanders\", \"744 Evergreen Terrace\", 60};\n\n// convert to JSON: copy each value into the JSON object\njson j;\nj[\"name\"] = p.name;\nj[\"address\"] = p.address;\nj[\"age\"] = p.age;\n\n// ...\n\n// convert from JSON: copy each value from the JSON object\nns::person p {\n    j[\"name\"].template get<std::string>(),\n    j[\"address\"].template get<std::string>(),\n    j[\"age\"].template get<int>()\n};\n

    It works, but that's quite a lot of boilerplate... Fortunately, there's a better way:

    // create a person\nns::person p {\"Ned Flanders\", \"744 Evergreen Terrace\", 60};\n\n// conversion: person -> json\njson j = p;\n\nstd::cout << j << std::endl;\n// {\"address\":\"744 Evergreen Terrace\",\"age\":60,\"name\":\"Ned Flanders\"}\n\n// conversion: json -> person\nauto p2 = j.template get<ns::person>();\n\n// that's it\nassert(p == p2);\n
    "},{"location":"features/arbitrary_types/#basic-usage","title":"Basic usage","text":"

    To make this work with one of your types, you only need to provide two functions:

    using json = nlohmann::json;\n\nnamespace ns {\n    void to_json(json& j, const person& p) {\n        j = json{ {\"name\", p.name}, {\"address\", p.address}, {\"age\", p.age} };\n    }\n\n    void from_json(const json& j, person& p) {\n        j.at(\"name\").get_to(p.name);\n        j.at(\"address\").get_to(p.address);\n        j.at(\"age\").get_to(p.age);\n    }\n} // namespace ns\n

    That's all! When calling the json constructor with your type, your custom to_json method will be automatically called. Likewise, when calling template get<your_type>() or get_to(your_type&), the from_json method will be called.

    Some important things:

    • Those methods MUST be in your type's namespace (which can be the global namespace), or the library will not be able to locate them (in this example, they are in namespace ns, where person is defined).
    • Those methods MUST be available (e.g., proper headers must be included) everywhere you use these conversions. Look at #1108 for errors that may occur otherwise.
    • When using template get<your_type>(), your_type MUST be DefaultConstructible. (There is a way to bypass this requirement described later.)
    • In function from_json, use function at() to access the object values rather than operator[]. In case a key does not exist, at throws an exception that you can handle, whereas operator[] exhibits undefined behavior.
    • You do not need to add serializers or deserializers for STL types like std::vector: the library already implements these.
    "},{"location":"features/arbitrary_types/#simplify-your-life-with-macros","title":"Simplify your life with macros","text":"

    If you just want to serialize/deserialize some structs, the to_json/from_json functions can be a lot of boilerplate.

    There are six macros to make your life easier as long as you (1) want to use a JSON object as serialization and (2) want to use the member variable names as object keys in that object:

    • NLOHMANN_DEFINE_TYPE_NON_INTRUSIVE(name, member1, member2, ...) is to be defined inside the namespace of the class/struct to create code for. It will throw an exception in from_json() due to a missing value in the JSON object.
    • NLOHMANN_DEFINE_TYPE_NON_INTRUSIVE_WITH_DEFAULT(name, member1, member2, ...) is to be defined inside the namespace of the class/struct to create code for. It will not throw an exception in from_json() due to a missing value in the JSON object, but fills in values from an object which is default-constructed by the type.
    • NLOHMANN_DEFINE_TYPE_NON_INTRUSIVE_ONLY_SERIALIZE(name, member1, member2, ...) is to be defined inside the namespace of the class/struct to create code for. It does not define a from_json() function which is needed in case the type does not have a default constructor.
    • NLOHMANN_DEFINE_TYPE_INTRUSIVE(name, member1, member2, ...) is to be defined inside the class/struct to create code for. This macro can also access private members. It will throw an exception in from_json() due to a missing value in the JSON object.
    • NLOHMANN_DEFINE_TYPE_INTRUSIVE_WITH_DEFAULT(name, member1, member2, ...) is to be defined inside the class/struct to create code for. This macro can also access private members. It will not throw an exception in from_json() due to a missing value in the JSON object, but fills in values from an object which is default-constructed by the type.
    • NLOHMANN_DEFINE_TYPE_INTRUSIVE_ONLY_SERIALIZE(name, member1, member2, ...) is to be defined inside the class/struct to create code for. This macro can also access private members. It does not define a from_json() function which is needed in case the type does not have a default constructor.

    Furthermore, there exist versions to use in the case of derived classes:

    Need access to private members Need only de-serialization Allow missing values when de-serializing macro NLOHMANN_DEFINE_TYPE_INTRUSIVE NLOHMANN_DEFINE_TYPE_INTRUSIVE_WITH_DEFAULT NLOHMANN_DEFINE_TYPE_INTRUSIVE_ONLY_SERIALIZE NLOHMANN_DEFINE_TYPE_NON_INTRUSIVE NLOHMANN_DEFINE_TYPE_NON_INTRUSIVE_WITH_DEFAULT NLOHMANN_DEFINE_TYPE_NON_INTRUSIVE_ONLY_SERIALIZE

    For derived classes and structs, use the following macros

    Need access to private members Need only de-serialization Allow missing values when de-serializing macro NLOHMANN_DEFINE_DERIVED_TYPE_INTRUSIVE NLOHMANN_DEFINE_DERIVED_TYPE_INTRUSIVE_WITH_DEFAULT NLOHMANN_DEFINE_DERIVED_TYPE_INTRUSIVE_ONLY_SERIALIZE NLOHMANN_DEFINE_DERIVED_TYPE_NON_INTRUSIVE NLOHMANN_DEFINE_DERIVED_TYPE_NON_INTRUSIVE_WITH_DEFAULT NLOHMANN_DEFINE_DERIVED_TYPE_NON_INTRUSIVE_ONLY_SERIALIZE

    Implementation limits

    • The current macro implementations are limited to at most 64 member variables. If you want to serialize/deserialize types with more than 64 member variables, you need to define the to_json/from_json functions manually.
    Example

    The to_json/from_json functions for the person struct above can be created with:

    namespace ns {\n    NLOHMANN_DEFINE_TYPE_NON_INTRUSIVE(person, name, address, age)\n}\n

    Here is an example with private members, where NLOHMANN_DEFINE_TYPE_INTRUSIVE is needed:

    namespace ns {\n    class address {\n      private:\n        std::string street;\n        int housenumber;\n        int postcode;\n\n      public:\n        NLOHMANN_DEFINE_TYPE_INTRUSIVE(address, street, housenumber, postcode)\n    };\n}\n
    "},{"location":"features/arbitrary_types/#how-do-i-convert-third-party-types","title":"How do I convert third-party types?","text":"

    This requires a bit more advanced technique. But first, let us see how this conversion mechanism works:

    The library uses JSON Serializers to convert types to JSON. The default serializer for nlohmann::json is nlohmann::adl_serializer (ADL means Argument-Dependent Lookup).

    It is implemented like this (simplified):

    template <typename T>\nstruct adl_serializer {\n    static void to_json(json& j, const T& value) {\n        // calls the \"to_json\" method in T's namespace\n    }\n\n    static void from_json(const json& j, T& value) {\n        // same thing, but with the \"from_json\" method\n    }\n};\n

    This serializer works fine when you have control over the type's namespace. However, what about boost::optional or std::filesystem::path (C++17)? Hijacking the boost namespace is pretty bad, and it's illegal to add something other than template specializations to std...

    To solve this, you need to add a specialization of adl_serializer to the nlohmann namespace, here's an example:

    // partial specialization (full specialization works too)\nNLOHMANN_JSON_NAMESPACE_BEGIN\ntemplate <typename T>\nstruct adl_serializer<boost::optional<T>> {\n    static void to_json(json& j, const boost::optional<T>& opt) {\n        if (opt == boost::none) {\n            j = nullptr;\n        } else {\n            j = *opt; // this will call adl_serializer<T>::to_json which will\n                      // find the free function to_json in T's namespace!\n        }\n    }\n\n    static void from_json(const json& j, boost::optional<T>& opt) {\n        if (j.is_null()) {\n            opt = boost::none;\n        } else {\n            opt = j.template get<T>(); // same as above, but with\n                              // adl_serializer<T>::from_json\n        }\n    }\n};\nNLOHMANN_JSON_NAMESPACE_END\n

    ABI compatibility

    Use NLOHMANN_JSON_NAMESPACE_BEGIN and NLOHMANN_JSON_NAMESPACE_END instead of namespace nlohmann { } in code which may be linked with different versions of this library.

    "},{"location":"features/arbitrary_types/#how-can-i-use-get-for-non-default-constructiblenon-copyable-types","title":"How can I use get() for non-default constructible/non-copyable types?","text":"

    There is a way if your type is MoveConstructible. You will need to specialize the adl_serializer as well, but with a special from_json overload:

    struct move_only_type {\n    move_only_type() = delete;\n    move_only_type(int ii): i(ii) {}\n    move_only_type(const move_only_type&) = delete;\n    move_only_type(move_only_type&&) = default;\n\n    int i;\n};\n\nnamespace nlohmann {\n    template <>\n    struct adl_serializer<move_only_type> {\n        // note: the return type is no longer 'void', and the method only takes\n        // one argument\n        static move_only_type from_json(const json& j) {\n            return {j.template get<int>()};\n        }\n\n        // Here's the catch! You must provide a to_json method! Otherwise, you\n        // will not be able to convert move_only_type to json, since you fully\n        // specialized adl_serializer on that type\n        static void to_json(json& j, move_only_type t) {\n            j = t.i;\n        }\n    };\n}\n
    "},{"location":"features/arbitrary_types/#can-i-write-my-own-serializer-advanced-use","title":"Can I write my own serializer? (Advanced use)","text":"

    Yes. You might want to take a look at unit-udt.cpp in the test suite, to see a few examples.

    If you write your own serializer, you will need to do a few things:

    • use a different basic_json alias than nlohmann::json (the last template parameter of basic_json is the JSONSerializer)
    • use your basic_json alias (or a template parameter) in all your to_json/from_json methods
    • use nlohmann::to_json and nlohmann::from_json when you need ADL

    Here is an example, without simplifications, that only accepts types with a size <= 32, and uses ADL.

    // You should use void as a second template argument\n// if you don't need compile-time checks on T\ntemplate<typename T, typename SFINAE = typename std::enable_if<sizeof(T) <= 32>::type>\nstruct less_than_32_serializer {\n    template <typename BasicJsonType>\n    static void to_json(BasicJsonType& j, T value) {\n        // we want to use ADL, and call the correct to_json overload\n        using nlohmann::to_json; // this method is called by adl_serializer,\n                                 // this is where the magic happens\n        to_json(j, value);\n    }\n\n    template <typename BasicJsonType>\n    static void from_json(const BasicJsonType& j, T& value) {\n        // same thing here\n        using nlohmann::from_json;\n        from_json(j, value);\n    }\n};\n

    Be very careful when reimplementing your serializer, you can stack overflow if you don't pay attention:

    template <typename T, void>\nstruct bad_serializer\n{\n    template <typename BasicJsonType>\n    static void to_json(BasicJsonType& j, const T& value) {\n      // this calls BasicJsonType::json_serializer<T>::to_json(j, value);\n      // if BasicJsonType::json_serializer == bad_serializer ... oops!\n      j = value;\n    }\n\n    template <typename BasicJsonType>\n    static void from_json(const BasicJsonType& j, T& value) {\n      // this calls BasicJsonType::json_serializer<T>::from_json(j, value);\n      // if BasicJsonType::json_serializer == bad_serializer ... oops!\n      value = j.template template get<T>(); // oops!\n    }\n};\n
    "},{"location":"features/assertions/","title":"Runtime Assertions","text":"

    The code contains numerous debug assertions to ensure class invariants are valid or to detect undefined behavior. Whereas the former class invariants are nothing to be concerned with, the latter checks for undefined behavior are to detect bugs in client code.

    "},{"location":"features/assertions/#switch-off-runtime-assertions","title":"Switch off runtime assertions","text":"

    Runtime assertions can be switched off by defining the preprocessor macro NDEBUG (see the documentation of assert) which is the default for release builds.

    "},{"location":"features/assertions/#change-assertion-behavior","title":"Change assertion behavior","text":"

    The behavior of runtime assertions can be changes by defining macro JSON_ASSERT(x) before including the json.hpp header.

    "},{"location":"features/assertions/#function-with-runtime-assertions","title":"Function with runtime assertions","text":""},{"location":"features/assertions/#unchecked-object-access-to-a-const-value","title":"Unchecked object access to a const value","text":"

    Function operator[] implements unchecked access for objects. Whereas a missing key is added in the case of non-const objects, accessing a const object with a missing key is undefined behavior (think of a dereferenced null pointer) and yields a runtime assertion.

    If you are not sure whether an element in an object exists, use checked access with the at function or call the contains function before.

    See also the documentation on element access.

    Example 1: Missing object key

    The following code will trigger an assertion at runtime:

    #include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    const json j = {{\"key\", \"value\"}};\n    auto v = j[\"missing\"];\n}\n

    Output:

    Assertion failed: (m_value.object->find(key) != m_value.object->end()), function operator[], file json.hpp, line 2144.\n
    "},{"location":"features/assertions/#constructing-from-an-uninitialized-iterator-range","title":"Constructing from an uninitialized iterator range","text":"

    Constructing a JSON value from an iterator range (see constructor) with an uninitialized iterator is undefined behavior and yields a runtime assertion.

    Example 2: Uninitialized iterator range

    The following code will trigger an assertion at runtime:

    #include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    json::iterator it1, it2;\n    json j(it1, it2);\n}\n

    Output:

    Assertion failed: (m_object != nullptr), function operator++, file iter_impl.hpp, line 368.\n
    "},{"location":"features/assertions/#operations-on-uninitialized-iterators","title":"Operations on uninitialized iterators","text":"

    Any operation on uninitialized iterators (i.e., iterators that are not associated with any JSON value) is undefined behavior and yields a runtime assertion.

    Example 3: Uninitialized iterator

    The following code will trigger an assertion at runtime:

    #include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n  json::iterator it;\n  ++it;\n}\n

    Output:

    Assertion failed: (m_object != nullptr), function operator++, file iter_impl.hpp, line 368.\n
    "},{"location":"features/assertions/#changes","title":"Changes","text":""},{"location":"features/assertions/#reading-from-a-null-file-or-char-pointer","title":"Reading from a null FILE or char pointer","text":"

    Reading from a null FILE or char pointer in C++ is undefined behavior. Until version 3.12.0, this library asserted that the pointer was not nullptr using a runtime assertion. If assertions were disabled, this would result in undefined behavior. Since version 3.12.0, this library checks for nullptr and throws a parse_error.101 to prevent the undefined behavior.

    Example 4: Reading from null pointer

    The following code will trigger an assertion at runtime:

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    std::FILE* f = std::fopen(\"nonexistent_file.json\", \"r\");\n    try {\n        json j = json::parse(f);\n    } catch (std::exception& e) {\n        std::cerr << e.what() << std::endl;\n    }\n}\n

    Output:

    [json.exception.parse_error.101] parse error: attempting to parse an empty input; check that your input string or stream contains the expected JSON\n
    "},{"location":"features/assertions/#see-also","title":"See also","text":"
    • JSON_ASSERT - control behavior of runtime assertions
    "},{"location":"features/binary_values/","title":"Binary Values","text":"

    The library implements several binary formats that encode JSON in an efficient way. Most of these formats support binary values; that is, values that have semantics defined outside the library and only define a sequence of bytes to be stored.

    JSON itself does not have a binary value. As such, binary values are an extension that this library implements to store values received by a binary format. Binary values are never created by the JSON parser and are only part of a serialized JSON text if they have been created manually or via a binary format.

    "},{"location":"features/binary_values/#api-for-binary-values","title":"API for binary values","text":"
    classDiagram\n\nclass binary_t [\"json::binary_t\"] {\n    +void set_subtype(std::uint64_t subtype)\n    +void clear_subtype()\n    +std::uint64_t subtype() const\n    +bool has_subtype() const\n}\n\nclass vector [\"std::vector<uint8_t>\"]\n\nvector <|-- binary_t

    By default, binary values are stored as std::vector<std::uint8_t>. This type can be changed by providing a template parameter to the basic_json type. To store binary subtypes, the storage type is extended and exposed as json::binary_t:

    auto binary = json::binary_t({0xCA, 0xFE, 0xBA, 0xBE});\nauto binary_with_subtype = json::binary_t({0xCA, 0xFE, 0xBA, 0xBE}, 42);\n

    There are several convenience functions to check and set the subtype:

    binary.has_subtype();                   // returns false\nbinary_with_subtype.has_subtype();      // returns true\n\nbinary_with_subtype.clear_subtype();\nbinary_with_subtype.has_subtype();      // returns true\n\nbinary_with_subtype.set_subtype(42);\nbinary.set_subtype(23);\n\nbinary.subtype();                       // returns 23\n

    As json::binary_t is subclassing std::vector<std::uint8_t>, all member functions are available:

    binary.size();  // returns 4\nbinary[1];      // returns 0xFE\n

    JSON values can be constructed from json::binary_t:

    json j = binary;\n

    Binary values are primitive values just like numbers or strings:

    j.is_binary();    // returns true\nj.is_primitive(); // returns true\n

    Given a binary JSON value, the binary_t can be accessed by reference as via get_binary():

    j.get_binary().has_subtype();  // returns true\nj.get_binary().size();         // returns 4\n

    For convenience, binary JSON values can be constructed via json::binary:

    auto j2 = json::binary({0xCA, 0xFE, 0xBA, 0xBE}, 23);\nauto j3 = json::binary({0xCA, 0xFE, 0xBA, 0xBE});\n\nj2 == j;                        // returns true\nj3.get_binary().has_subtype();  // returns false\nj3.get_binary().subtype();      // returns std::uint64_t(-1) as j3 has no subtype\n
    "},{"location":"features/binary_values/#serialization","title":"Serialization","text":"

    Binary values are serialized differently according to the formats.

    "},{"location":"features/binary_values/#json","title":"JSON","text":"

    JSON does not have a binary type, and this library does not introduce a new type as this would break conformance. Instead, binary values are serialized as an object with two keys: bytes holds an array of integers, and subtype is an integer or null.

    Example

    Code:

    // create a binary value of subtype 42\njson j;\nj[\"binary\"] = json::binary({0xCA, 0xFE, 0xBA, 0xBE}, 42);\n\n// serialize to standard output\nstd::cout << j.dump(2) << std::endl;\n

    Output:

    {\n  \"binary\": {\n    \"bytes\": [202, 254, 186, 190],\n    \"subtype\": 42\n  }\n}\n

    No roundtrip for binary values

    The JSON parser will not parse the objects generated by binary values back to binary values. This is by design to remain standards compliant. Serializing binary values to JSON is only implemented for debugging purposes.

    "},{"location":"features/binary_values/#bjdata","title":"BJData","text":"

    BJData neither supports binary values nor subtypes and proposes to serialize binary values as an array of uint8 values. The library implements this translation.

    Example

    Code:

    // create a binary value of subtype 42 (will be ignored in BJData)\njson j;\nj[\"binary\"] = json::binary({0xCA, 0xFE, 0xBA, 0xBE}, 42);\n\n// convert to BJData\nauto v = json::to_bjdata(j);      \n

    v is a std::vector<std::uint8t> with the following 20 elements:

    0x7B                                             // '{'\n    0x69 0x06                                    // i 6 (length of the key)\n    0x62 0x69 0x6E 0x61 0x72 0x79                // \"binary\"\n    0x5B                                         // '['\n        0x55 0xCA 0x55 0xFE 0x55 0xBA 0x55 0xBE  // content (each byte prefixed with 'U')\n    0x5D                                         // ']'\n0x7D                                             // '}'\n

    The following code uses the type and size optimization for UBJSON:

    // convert to UBJSON using the size and type optimization\nauto v = json::to_bjdata(j, true, true);\n

    The resulting vector has 22 elements; the optimization is not effective for examples with few values:

    0x7B                                // '{'\n    0x23 0x69 0x01                  // '#' 'i' type of the array elements: unsigned integers\n    0x69 0x06                       // i 6 (length of the key)\n    0x62 0x69 0x6E 0x61 0x72 0x79   // \"binary\"\n    0x5B                            // '[' array\n        0x24 0x55                   // '$' 'U' type of the array elements: unsigned integers\n        0x23 0x69 0x04              // '#' i 4 number of array elements\n        0xCA 0xFE 0xBA 0xBE         // content\n

    Note that subtype (42) is not serialized and that UBJSON has no binary type, and deserializing v would yield the following value:

    {\n  \"binary\": [202, 254, 186, 190]\n}\n
    "},{"location":"features/binary_values/#bson","title":"BSON","text":"

    BSON supports binary values and subtypes. If a subtype is given, it is used and added as an unsigned 8-bit integer. If no subtype is given, the generic binary subtype 0x00 is used.

    Example

    Code:

    // create a binary value of subtype 42\njson j;\nj[\"binary\"] = json::binary({0xCA, 0xFE, 0xBA, 0xBE}, 42);\n\n// convert to BSON\nauto v = json::to_bson(j);      \n

    v is a std::vector<std::uint8t> with the following 22 elements:

    0x16 0x00 0x00 0x00                         // number of bytes in the document\n    0x05                                    // binary value\n        0x62 0x69 0x6E 0x61 0x72 0x79 0x00  // key \"binary\" + null byte\n        0x04 0x00 0x00 0x00                 // number of bytes\n        0x2a                                // subtype\n        0xCA 0xFE 0xBA 0xBE                 // content\n0x00                                        // end of the document\n

    Note that the serialization preserves the subtype, and deserializing v would yield the following value:

    {\n  \"binary\": {\n    \"bytes\": [202, 254, 186, 190],\n    \"subtype\": 42\n  }\n}\n
    "},{"location":"features/binary_values/#cbor","title":"CBOR","text":"

    CBOR supports binary values, but no subtypes. Subtypes will be serialized as tags. Any binary value will be serialized as byte strings. The library will choose the smallest representation using the length of the byte array.

    Example

    Code:

    // create a binary value of subtype 42\njson j;\nj[\"binary\"] = json::binary({0xCA, 0xFE, 0xBA, 0xBE}, 42);\n\n// convert to CBOR\nauto v = json::to_cbor(j);      \n

    v is a std::vector<std::uint8t> with the following 15 elements:

    0xA1                                   // map(1)\n    0x66                               // text(6)\n        0x62 0x69 0x6E 0x61 0x72 0x79  // \"binary\"\n    0xD8 0x2A                          // tag(42)\n    0x44                               // bytes(4)\n        0xCA 0xFE 0xBA 0xBE            // content\n

    Note that the subtype is serialized as tag. However, parsing tagged values yield a parse error unless json::cbor_tag_handler_t::ignore or json::cbor_tag_handler_t::store is passed to json::from_cbor.

    {\n  \"binary\": {\n    \"bytes\": [202, 254, 186, 190],\n    \"subtype\": null\n  }\n}\n
    "},{"location":"features/binary_values/#messagepack","title":"MessagePack","text":"

    MessagePack supports binary values and subtypes. If a subtype is given, the ext family is used. The library will choose the smallest representation among fixext1, fixext2, fixext4, fixext8, ext8, ext16, and ext32. The subtype is then added as a signed 8-bit integer.

    If no subtype is given, the bin family (bin8, bin16, bin32) is used.

    Example

    Code:

    // create a binary value of subtype 42\njson j;\nj[\"binary\"] = json::binary({0xCA, 0xFE, 0xBA, 0xBE}, 42);\n\n// convert to MessagePack\nauto v = json::to_msgpack(j);      \n

    v is a std::vector<std::uint8t> with the following 14 elements:

    0x81                                   // fixmap1\n    0xA6                               // fixstr6\n        0x62 0x69 0x6E 0x61 0x72 0x79  // \"binary\"\n    0xD6                               // fixext4\n        0x2A                           // subtype\n        0xCA 0xFE 0xBA 0xBE            // content\n

    Note that the serialization preserves the subtype, and deserializing v would yield the following value:

    {\n  \"binary\": {\n    \"bytes\": [202, 254, 186, 190],\n    \"subtype\": 42\n  }\n}\n
    "},{"location":"features/binary_values/#ubjson","title":"UBJSON","text":"

    UBJSON neither supports binary values nor subtypes and proposes to serialize binary values as an array of uint8 values. The library implements this translation.

    Example

    Code:

    // create a binary value of subtype 42 (will be ignored in UBJSON)\njson j;\nj[\"binary\"] = json::binary({0xCA, 0xFE, 0xBA, 0xBE}, 42);\n\n// convert to UBJSON\nauto v = json::to_ubjson(j);      \n

    v is a std::vector<std::uint8t> with the following 20 elements:

    0x7B                                             // '{'\n    0x69 0x06                                    // i 6 (length of the key)\n    0x62 0x69 0x6E 0x61 0x72 0x79                // \"binary\"\n    0x5B                                         // '['\n        0x55 0xCA 0x55 0xFE 0x55 0xBA 0x55 0xBE  // content (each byte prefixed with 'U')\n    0x5D                                         // ']'\n0x7D                                             // '}'\n

    The following code uses the type and size optimization for UBJSON:

    // convert to UBJSON using the size and type optimization\nauto v = json::to_ubjson(j, true, true);\n

    The resulting vector has 23 elements; the optimization is not effective for examples with few values:

    0x7B                                // '{'\n    0x24                            // '$' type of the object elements\n    0x5B                            // '[' array\n    0x23 0x69 0x01                  // '#' i 1 number of object elements\n    0x69 0x06                       // i 6 (length of the key)\n    0x62 0x69 0x6E 0x61 0x72 0x79   // \"binary\"\n        0x24 0x55                   // '$' 'U' type of the array elements: unsigned integers\n        0x23 0x69 0x04              // '#' i 4 number of array elements\n        0xCA 0xFE 0xBA 0xBE         // content\n

    Note that subtype (42) is not serialized and that UBJSON has no binary type, and deserializing v would yield the following value:

    {\n  \"binary\": [202, 254, 186, 190]\n}\n
    "},{"location":"features/comments/","title":"Comments","text":"

    This library does not support comments by default. It does so for three reasons:

    1. Comments are not part of the JSON specification. You may argue that // or /* */ are allowed in JavaScript, but JSON is not JavaScript.

    2. This was not an oversight: Douglas Crockford wrote on this in May 2012:

      I removed comments from JSON because I saw people were using them to hold parsing directives, a practice which would have destroyed interoperability. I know that the lack of comments makes some people sad, but it shouldn't.

      Suppose you are using JSON to keep configuration files, which you would like to annotate. Go ahead and insert all the comments you like. Then pipe it through JSMin before handing it to your JSON parser.

    3. It is dangerous for interoperability if some libraries add comment support while others do not. Please check The Harmful Consequences of the Robustness Principle on this.

    However, you can set parameter ignore_comments to true in the parse function to ignore // or /* */ comments. Comments will then be treated as whitespace.

    For more information, see JSON With Commas and Comments (JWCC).

    Example

    Consider the following JSON with comments.

    {\n    // update in 2006: removed Pluto\n    \"planets\": [\"Mercury\", \"Venus\", \"Earth\", \"Mars\",\n                \"Jupiter\", \"Uranus\", \"Neptune\" /*, \"Pluto\" */]\n}\n

    When calling parse without additional argument, a parse error exception is thrown. If ignore_comments is set to true, the comments are ignored during parsing:

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    std::string s = R\"(\n    {\n        // update in 2006: removed Pluto\n        \"planets\": [\"Mercury\", \"Venus\", \"Earth\", \"Mars\",\n                    \"Jupiter\", \"Uranus\", \"Neptune\" /*, \"Pluto\" */]\n    }\n    )\";\n\n    try\n    {\n        json j = json::parse(s);\n    }\n    catch (json::exception& e)\n    {\n        std::cout << e.what() << std::endl;\n    }\n\n    json j = json::parse(s,\n                         /* callback */ nullptr,\n                         /* allow exceptions */ true,\n                         /* ignore_comments */ true);\n    std::cout << j.dump(2) << '\\n';\n}\n

    Output:

    [json.exception.parse_error.101] parse error at line 3, column 9: syntax error while parsing object key - invalid literal; last read: '<U+000A>    {<U+000A>        /'; expected string literal\n{\n  \"planets\": [\n    \"Mercury\",\n    \"Venus\",\n    \"Earth\",\n    \"Mars\",\n    \"Jupiter\",\n    \"Uranus\",\n    \"Neptune\"\n  ]\n}\n
    "},{"location":"features/enum_conversion/","title":"Specializing enum conversion","text":"

    By default, enum values are serialized to JSON as integers. In some cases, this could result in undesired behavior. If the integer values of any enum values are changed after data using those enum values has been serialized to JSON, then deserializing that JSON would result in a different enum value being restored, or the value not being found at all.

    It is possible to more precisely specify how a given enum is mapped to and from JSON as shown below:

    // example enum type declaration\nenum TaskState {\n    TS_STOPPED,\n    TS_RUNNING,\n    TS_COMPLETED,\n    TS_INVALID=-1,\n};\n\n// map TaskState values to JSON as strings\nNLOHMANN_JSON_SERIALIZE_ENUM( TaskState, {\n    {TS_INVALID, nullptr},\n    {TS_STOPPED, \"stopped\"},\n    {TS_RUNNING, \"running\"},\n    {TS_COMPLETED, \"completed\"},\n})\n

    The NLOHMANN_JSON_SERIALIZE_ENUM() macro declares a set of to_json() / from_json() functions for type TaskState while avoiding repetition and boilerplate serialization code.

    "},{"location":"features/enum_conversion/#usage","title":"Usage","text":"
    // enum to JSON as string\njson j = TS_STOPPED;\nassert(j == \"stopped\");\n\n// json string to enum\njson j3 = \"running\";\nassert(j3.template get<TaskState>() == TS_RUNNING);\n\n// undefined json value to enum (where the first map entry above is the default)\njson jPi = 3.14;\nassert(jPi.template get<TaskState>() == TS_INVALID );\n
    "},{"location":"features/enum_conversion/#notes","title":"Notes","text":"

    Just as in Arbitrary Type Conversions above,

    • NLOHMANN_JSON_SERIALIZE_ENUM() MUST be declared in your enum type's namespace (which can be the global namespace), or the library will not be able to locate it, and it will default to integer serialization.
    • It MUST be available (e.g., proper headers must be included) everywhere you use the conversions.

    Other Important points:

    • When using template get<ENUM_TYPE>(), undefined JSON values will default to the first pair specified in your map. Select this default pair carefully.
    • If an enum or JSON value is specified more than once in your map, the first matching occurrence from the top of the map will be returned when converting to or from JSON.
    • To disable the default serialization of enumerators as integers and force a compiler error instead, see JSON_DISABLE_ENUM_SERIALIZATION.
    "},{"location":"features/iterators/","title":"Iterators","text":""},{"location":"features/iterators/#overview","title":"Overview","text":"

    A basic_json value is a container and allows access via iterators. Depending on the value type, basic_json stores zero or more values.

    As for other containers, begin() returns an iterator to the first value and end() returns an iterator to the value following the last value. The latter iterator is a placeholder and cannot be dereferenced. In case of null values, empty arrays, or empty objects, begin() will return end().

    "},{"location":"features/iterators/#iteration-order-for-objects","title":"Iteration order for objects","text":"

    When iterating over objects, values are ordered with respect to the object_comparator_t type which defaults to std::less. See the types documentation for more information.

    Example 
    // create JSON object {\"one\": 1, \"two\": 2, \"three\": 3}\njson j;\nj[\"one\"] = 1;\nj[\"two\"] = 2;\nj[\"three\"] = 3;\n\nfor (auto it = j.begin(); it != j.end(); ++it)\n{\n    std::cout << *it << std::endl;\n}\n

    Output:

    1\n3\n2\n

    The reason for the order is the lexicographic ordering of the object keys \"one\", \"three\", \"two\".

    "},{"location":"features/iterators/#access-object-keys-during-iteration","title":"Access object keys during iteration","text":"

    The JSON iterators have two member functions, key() and value() to access the object key and stored value, respectively. When calling key() on a non-object iterator, an invalid_iterator.207 exception is thrown.

    Example 
    // create JSON object {\"one\": 1, \"two\": 2, \"three\": 3}\njson j;\nj[\"one\"] = 1;\nj[\"two\"] = 2;\nj[\"three\"] = 3;\n\nfor (auto it = j.begin(); it != j.end(); ++it)\n{\n    std::cout << it.key() << \" : \" << it.value() << std::endl;\n}\n

    Output:

    one : 1\nthree : 3\ntwo : 2\n
    "},{"location":"features/iterators/#range-based-for-loops","title":"Range-based for loops","text":"

    C++11 allows using range-based for loops to iterate over a container.

    for (auto it : j_object)\n{\n    // \"it\" is of type json::reference and has no key() member\n    std::cout << \"value: \" << it << '\\n';\n}\n

    For this reason, the items() function allows accessing iterator::key() and iterator::value() during range-based for loops. In these loops, a reference to the JSON values is returned, so there is no access to the underlying iterator.

    for (auto& el : j_object.items())\n{\n    std::cout << \"key: \" << el.key() << \", value:\" << el.value() << '\\n';\n}\n

    The items() function also allows using structured bindings (C++17):

    for (auto& [key, val] : j_object.items())\n{\n    std::cout << \"key: \" << key << \", value:\" << val << '\\n';\n}\n

    Note

    When iterating over an array, key() will return the index of the element as string. For primitive types (e.g., numbers), key() returns an empty string.

    Warning

    Using items() on temporary objects is dangerous. Make sure the object's lifetime exceeds the iteration. See #2040 for more information.

    "},{"location":"features/iterators/#reverse-iteration-order","title":"Reverse iteration order","text":"

    rbegin() and rend() return iterators in the reverse sequence.

    Example 
    json j = {1, 2, 3, 4};\n\nfor (auto it = j.rbegin(); it != j.rend(); ++it)\n{\n    std::cout << *it << std::endl;\n}\n

    Output:

    4\n3\n2\n1\n
    "},{"location":"features/iterators/#iterating-strings-and-binary-values","title":"Iterating strings and binary values","text":"

    Note that \"value\" means a JSON value in this setting, not values stored in the underlying containers. That is, *begin() returns the complete string or binary array and is also safe the underlying string or binary array is empty.

    Example 
    json j = \"Hello, world\";\nfor (auto it = j.begin(); it != j.end(); ++it)\n{\n    std::cout << *it << std::endl;\n}\n

    Output:

    \"Hello, world\"\n
    "},{"location":"features/iterators/#iterator-invalidation","title":"Iterator invalidation","text":"Operations invalidated iterators clear all"},{"location":"features/json_patch/","title":"JSON Patch and Diff","text":""},{"location":"features/json_patch/#patches","title":"Patches","text":"

    JSON Patch (RFC 6902) defines a JSON document structure for expressing a sequence of operations to apply to a JSON document. With the patch function, a JSON Patch is applied to the current JSON value by executing all operations from the patch.

    Example

    The following code shows how a JSON patch is applied to a value.

    #include <iostream>\n#include <iomanip>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\nusing namespace nlohmann::literals;\n\nint main()\n{\n    // the original document\n    json doc = R\"(\n        {\n          \"baz\": \"qux\",\n          \"foo\": \"bar\"\n        }\n    )\"_json;\n\n    // the patch\n    json patch = R\"(\n        [\n          { \"op\": \"replace\", \"path\": \"/baz\", \"value\": \"boo\" },\n          { \"op\": \"add\", \"path\": \"/hello\", \"value\": [\"world\"] },\n          { \"op\": \"remove\", \"path\": \"/foo\"}\n        ]\n    )\"_json;\n\n    // apply the patch\n    json patched_doc = doc.patch(patch);\n\n    // output original and patched document\n    std::cout << std::setw(4) << doc << \"\\n\\n\"\n              << std::setw(4) << patched_doc << std::endl;\n}\n

    Output:

    {\n    \"baz\": \"qux\",\n    \"foo\": \"bar\"\n}\n\n{\n    \"baz\": \"boo\",\n    \"hello\": [\n        \"world\"\n    ]\n}\n
    "},{"location":"features/json_patch/#diff","title":"Diff","text":"

    The library can also calculate a JSON patch (i.e., a diff) given two JSON values.

    Invariant

    For two JSON values source and target, the following code yields always true:

    source.patch(diff(source, target)) == target;\n
    Example

    The following code shows how a JSON patch is created as a diff for two JSON values.

    #include <iostream>\n#include <iomanip>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\nusing namespace nlohmann::literals;\n\nint main()\n{\n    // the source document\n    json source = R\"(\n        {\n            \"baz\": \"qux\",\n            \"foo\": \"bar\"\n        }\n    )\"_json;\n\n    // the target document\n    json target = R\"(\n        {\n            \"baz\": \"boo\",\n            \"hello\": [\n                \"world\"\n            ]\n        }\n    )\"_json;\n\n    // create the patch\n    json patch = json::diff(source, target);\n\n    // roundtrip\n    json patched_source = source.patch(patch);\n\n    // output patch and roundtrip result\n    std::cout << std::setw(4) << patch << \"\\n\\n\"\n              << std::setw(4) << patched_source << std::endl;\n}\n

    Output:

    [\n    {\n        \"op\": \"replace\",\n        \"path\": \"/baz\",\n        \"value\": \"boo\"\n    },\n    {\n        \"op\": \"remove\",\n        \"path\": \"/foo\"\n    },\n    {\n        \"op\": \"add\",\n        \"path\": \"/hello\",\n        \"value\": [\n            \"world\"\n        ]\n    }\n]\n\n{\n    \"baz\": \"boo\",\n    \"hello\": [\n        \"world\"\n    ]\n}\n
    "},{"location":"features/json_pointer/","title":"JSON Pointer","text":""},{"location":"features/json_pointer/#introduction","title":"Introduction","text":"

    The library supports JSON Pointer (RFC 6901) as an alternative means to address structured values. A JSON Pointer is a string that identifies a specific value within a JSON document.

    Consider the following JSON document

    {\n    \"array\": [\"A\", \"B\", \"C\"],\n    \"nested\": {\n        \"one\": 1,\n        \"two\": 2,\n        \"three\": [true, false]\n    }\n}\n

    Then every value inside the JSON document can be identified as follows:

    JSON Pointer JSON value `` {\"array\":[\"A\",\"B\",\"C\"],\"nested\":{\"one\":1,\"two\":2,\"three\":[true,false]}} /array [\"A\",\"B\",\"C\"] /array/0 A /array/1 B /array/2 C /nested {\"one\":1,\"two\":2,\"three\":[true,false]} /nested/one 1 /nested/two 2 /nested/three [true,false] /nested/three/0 true /nested/three/1 false

    Note / does not identify the root (i.e., the whole document), but an object entry with empty key \"\". See RFC 6901 for more information.

    "},{"location":"features/json_pointer/#json-pointer-creation","title":"JSON Pointer creation","text":"

    JSON Pointers can be created from a string:

    json::json_pointer p(\"/nested/one\");\n

    Furthermore, a user-defined string literal can be used to achieve the same result:

    auto p = \"/nested/one\"_json_pointer;\n

    The escaping rules of RFC 6901 are implemented. See the constructor documentation for more information.

    "},{"location":"features/json_pointer/#value-access","title":"Value access","text":"

    JSON Pointers can be used in the at, operator[], and value functions just like object keys or array indices.

    // the JSON value from above\nauto j = json::parse(R\"({\n    \"array\": [\"A\", \"B\", \"C\"],\n    \"nested\": {\n        \"one\": 1,\n        \"two\": 2,\n        \"three\": [true, false]\n    }\n})\");\n\n// access values\nauto val = j[\"\"_json_pointer];                              // {\"array\":[\"A\",\"B\",\"C\"],...}\nauto val1 = j[\"/nested/one\"_json_pointer];                  // 1\nauto val2 = j.at(json::json_pointer(\"/nested/three/1\"));    // false\nauto val3 = j.value(json::json_pointer(\"/nested/four\"), 0); // 0\n
    "},{"location":"features/json_pointer/#flatten-unflatten","title":"Flatten / unflatten","text":"

    The library implements a function flatten to convert any JSON document into a JSON object where each key is a JSON Pointer and each value is a primitive JSON value (i.e., a string, boolean, number, or null).

    // the JSON value from above\nauto j = json::parse(R\"({\n    \"array\": [\"A\", \"B\", \"C\"],\n    \"nested\": {\n        \"one\": 1,\n        \"two\": 2,\n        \"three\": [true, false]\n    }\n})\");\n\n// create flattened value\nauto j_flat = j.flatten();\n

    The resulting value j_flat is:

    {\n  \"/array/0\": \"A\",\n  \"/array/1\": \"B\",\n  \"/array/2\": \"C\",\n  \"/nested/one\": 1,\n  \"/nested/two\": 2,\n  \"/nested/three/0\": true,\n  \"/nested/three/1\": false\n}\n

    The reverse function, unflatten recreates the original value.

    auto j_original = j_flat.unflatten();\n
    "},{"location":"features/json_pointer/#see-also","title":"See also","text":"
    • Class json_pointer
    • Function flatten
    • Function unflatten
    • JSON Patch
    "},{"location":"features/macros/","title":"Supported Macros","text":"

    Some aspects of the library can be configured by defining preprocessor macros before including the json.hpp header. See also the API documentation for macros for examples and more information.

    "},{"location":"features/macros/#json_assertx","title":"JSON_ASSERT(x)","text":"

    This macro controls which code is executed for runtime assertions of the library.

    See full documentation of JSON_ASSERT(x).

    "},{"location":"features/macros/#json_catch_userexception","title":"JSON_CATCH_USER(exception)","text":"

    This macro overrides catch calls inside the library.

    See full documentation of JSON_CATCH_USER(exception).

    "},{"location":"features/macros/#json_diagnostics","title":"JSON_DIAGNOSTICS","text":"

    This macro enables extended diagnostics for exception messages. Possible values are 1 to enable or 0 to disable (default).

    When enabled, exception messages contain a JSON Pointer to the JSON value that triggered the exception, see Extended diagnostic messages for an example. Note that enabling this macro increases the size of every JSON value by one pointer and adds some runtime overhead.

    The diagnostics messages can also be controlled with the CMake option JSON_Diagnostics (OFF by default) which sets JSON_DIAGNOSTICS accordingly.

    See full documentation of JSON_DIAGNOSTICS.

    "},{"location":"features/macros/#json_diagnostic_positions","title":"JSON_DIAGNOSTIC_POSITIONS","text":"

    When enabled, two new member functions start_pos() and end_pos() are added to basic_json values. If the value was created by calling theparse function, then these functions allow querying the byte positions of the value in the input it was parsed from. The byte positions are also used in exceptions to help locate errors.

    The diagnostics positions can also be controlled with the CMake option JSON_Diagnostic_Positions (OFF by default) which sets JSON_DIAGNOSTIC_POSITIONS accordingly.

    See full documentation of JSON_DIAGNOSTIC_POSITIONS

    "},{"location":"features/macros/#json_has_cpp_11-json_has_cpp_14-json_has_cpp_17-json_has_cpp_20","title":"JSON_HAS_CPP_11, JSON_HAS_CPP_14, JSON_HAS_CPP_17, JSON_HAS_CPP_20","text":"

    The library targets C++11, but also supports some features introduced in later C++ versions (e.g., std::string_view support for C++17). For these new features, the library implements some preprocessor checks to determine the C++ standard. By defining any of these symbols, the internal check is overridden and the provided C++ version is unconditionally assumed. This can be helpful for compilers that only implement parts of the standard and would be detected incorrectly.

    See full documentation of JSON_HAS_CPP_11, JSON_HAS_CPP_14, JSON_HAS_CPP_17, and JSON_HAS_CPP_20.

    "},{"location":"features/macros/#json_has_filesystem-json_has_experimental_filesystem","title":"JSON_HAS_FILESYSTEM, JSON_HAS_EXPERIMENTAL_FILESYSTEM","text":"

    When compiling with C++17, the library provides conversions from and to std::filesystem::path. As compiler support for filesystem is limited, the library tries to detect whether <filesystem>/std::filesystem (JSON_HAS_FILESYSTEM) or <experimental/filesystem>/std::experimental::filesystem (JSON_HAS_EXPERIMENTAL_FILESYSTEM) should be used. To override the built-in check, define JSON_HAS_FILESYSTEM or JSON_HAS_EXPERIMENTAL_FILESYSTEM to 1.

    See full documentation of JSON_HAS_FILESYSTEM and JSON_HAS_EXPERIMENTAL_FILESYSTEM.

    "},{"location":"features/macros/#json_noexception","title":"JSON_NOEXCEPTION","text":"

    Exceptions can be switched off by defining the symbol JSON_NOEXCEPTION.

    See full documentation of JSON_NOEXCEPTION.

    "},{"location":"features/macros/#json_disable_enum_serialization","title":"JSON_DISABLE_ENUM_SERIALIZATION","text":"

    When defined, default parse and serialize functions for enums are excluded and have to be provided by the user, for example, using NLOHMANN_JSON_SERIALIZE_ENUM.

    See full documentation of JSON_DISABLE_ENUM_SERIALIZATION.

    "},{"location":"features/macros/#json_no_io","title":"JSON_NO_IO","text":"

    When defined, headers <cstdio>, <ios>, <iosfwd>, <istream>, and <ostream> are not included and parse functions relying on these headers are excluded. This is relevant for environment where these I/O functions are disallowed for security reasons (e.g., Intel Software Guard Extensions (SGX)).

    See full documentation of JSON_NO_IO.

    "},{"location":"features/macros/#json_skip_library_version_check","title":"JSON_SKIP_LIBRARY_VERSION_CHECK","text":"

    When defined, the library will not create a compiler warning when a different version of the library was already included.

    See full documentation of JSON_SKIP_LIBRARY_VERSION_CHECK.

    "},{"location":"features/macros/#json_skip_unsupported_compiler_check","title":"JSON_SKIP_UNSUPPORTED_COMPILER_CHECK","text":"

    When defined, the library will not create a compile error when a known unsupported compiler is detected. This allows using the library with compilers that do not fully support C++11 and may only work if unsupported features are not used.

    See full documentation of JSON_SKIP_UNSUPPORTED_COMPILER_CHECK.

    "},{"location":"features/macros/#json_throw_userexception","title":"JSON_THROW_USER(exception)","text":"

    This macro overrides throw calls inside the library. The argument is the exception to be thrown.

    See full documentation of JSON_THROW_USER(exception).

    "},{"location":"features/macros/#json_try_user","title":"JSON_TRY_USER","text":"

    This macro overrides try calls inside the library.

    See full documentation of JSON_TRY_USER.

    "},{"location":"features/macros/#json_use_implicit_conversions","title":"JSON_USE_IMPLICIT_CONVERSIONS","text":"

    When defined to 0, implicit conversions are switched off. By default, implicit conversions are switched on.

    See full documentation of JSON_USE_IMPLICIT_CONVERSIONS.

    "},{"location":"features/macros/#nlohmann_define_type_-nlohmann_define_derived_type_","title":"NLOHMANN_DEFINE_TYPE_*(...), NLOHMANN_DEFINE_DERIVED_TYPE_*(...)","text":"

    The library defines 12 macros to simplify the serialization/deserialization of types. See the page on arbitrary type conversion for a detailed discussion.

    "},{"location":"features/macros/#nlohmann_json_serialize_enumtype","title":"NLOHMANN_JSON_SERIALIZE_ENUM(type, ...)","text":"

    This macro simplifies the serialization/deserialization of enum types. See Specializing enum conversion for more information.

    See full documentation of NLOHMANN_JSON_SERIALIZE_ENUM.

    "},{"location":"features/macros/#nlohmann_json_version_major-nlohmann_json_version_minor-nlohmann_json_version_patch","title":"NLOHMANN_JSON_VERSION_MAJOR, NLOHMANN_JSON_VERSION_MINOR, NLOHMANN_JSON_VERSION_PATCH","text":"

    These macros are defined by the library and contain the version numbers according to Semantic Versioning 2.0.0.

    See full documentation of NLOHMANN_JSON_VERSION_MAJOR, NLOHMANN_JSON_VERSION_MINOR, and NLOHMANN_JSON_VERSION_PATCH.

    "},{"location":"features/merge_patch/","title":"JSON Merge Patch","text":"

    The library supports JSON Merge Patch (RFC 7386) as a patch format. The merge patch format is primarily intended for use with the HTTP PATCH method as a means of describing a set of modifications to a target resource's content. This function applies a merge patch to the current JSON value.

    Instead of using JSON Pointer to specify values to be manipulated, it describes the changes using a syntax that closely mimics the document being modified.

    Example

    The following code shows how a JSON Merge Patch is applied to a JSON document.

    #include <iostream>\n#include <nlohmann/json.hpp>\n#include <iomanip> // for std::setw\n\nusing json = nlohmann::json;\nusing namespace nlohmann::literals;\n\nint main()\n{\n    // the original document\n    json document = R\"({\n                \"title\": \"Goodbye!\",\n                \"author\": {\n                    \"givenName\": \"John\",\n                    \"familyName\": \"Doe\"\n                },\n                \"tags\": [\n                    \"example\",\n                    \"sample\"\n                ],\n                \"content\": \"This will be unchanged\"\n            })\"_json;\n\n    // the patch\n    json patch = R\"({\n                \"title\": \"Hello!\",\n                \"phoneNumber\": \"+01-123-456-7890\",\n                \"author\": {\n                    \"familyName\": null\n                },\n                \"tags\": [\n                    \"example\"\n                ]\n            })\"_json;\n\n    // apply the patch\n    document.merge_patch(patch);\n\n    // output original and patched document\n    std::cout << std::setw(4) << document << std::endl;\n}\n

    Output:

    {\n    \"author\": {\n        \"givenName\": \"John\"\n    },\n    \"content\": \"This will be unchanged\",\n    \"phoneNumber\": \"+01-123-456-7890\",\n    \"tags\": [\n        \"example\"\n    ],\n    \"title\": \"Hello!\"\n}\n
    "},{"location":"features/namespace/","title":"nlohmann Namespace","text":"

    The 3.11.0 release introduced an inline namespace to allow different parts of a codebase to safely use different versions of the JSON library as long as they never exchange instances of library types.

    "},{"location":"features/namespace/#structure","title":"Structure","text":"

    The complete default namespace name is derived as follows:

    • The root namespace is always nlohmann.
    • The inline namespace starts with json_abi and is followed by serveral optional ABI tags according to the value of these ABI-affecting macros, in order:
      • JSON_DIAGNOSTICS defined non-zero appends _diag.
      • JSON_USE_LEGACY_DISCARDED_VALUE_COMPARISON defined non-zero appends _ldvcmp.
    • The inline namespace ends with the suffix _v followed by the 3 components of the version number separated by underscores. To omit the version component, see Disabling the version component below.

    For example, the namespace name for version 3.11.2 with JSON_DIAGNOSTICS defined to 1 is:

    nlohmann::json_abi_diag_v3_11_2\n
    "},{"location":"features/namespace/#purpose","title":"Purpose","text":"

    Several incompatibilities have been observed. Amongst the most common ones is linking code compiled with different definitions of JSON_DIAGNOSTICS. This is illustrated in the diagram below.

    graph\n    json[\"<strong>nlohmann_json (v3.10.5)</strong><br>JSON_DIAGNOSTICS=0\"]\n    json_diag[\"<strong>nlohmann_json (v3.10.5)</strong><br>JSON_DIAGNOSTICS=1\"]\n    library[\"<strong>some library</strong>\"]\n    app[\"<strong>application</strong>\"]\n\n    library --> json\n    app --> json_diag\n    app --> library

    In releases prior to 3.11.0, mixing any version of the JSON library with different JSON_DIAGNOSTICS settings would result in a crashing application. If some_library never passes instances of JSON library types to the application, this scenario became safe in version 3.11.0 and above due to the inline namespace yielding distinct symbol names.

    "},{"location":"features/namespace/#limitations","title":"Limitations","text":"

    Neither the compiler nor the linker will issue as much as a warning when translation units \u2013 intended to be linked together and that include different versions and/or configurations of the JSON library \u2013 exchange and use library types.

    There is an exception when forward declarations are used (i.e., when including json_fwd.hpp) in which case the linker may complain about undefined references.

    "},{"location":"features/namespace/#disabling-the-version-component","title":"Disabling the version component","text":"

    Different versions are not necessarily ABI-incompatible, but the project does not actively track changes in the ABI and recommends that all parts of a codebase exchanging library types be built with the same version. Users can, at their own risk, disable the version component of the linline namespace, allowing different versions \u2013 but not configurations \u2013 to be used in cases where the linker would otherwise output undefined reference errors.

    To do so, define NLOHMANN_JSON_NAMESPACE_NO_VERSION to 1.

    This applies to version 3.11.2 and above only; versions 3.11.0 and 3.11.1 can apply the technique described in the next section to emulate the effect of the NLOHMANN_JSON_NAMESPACE_NO_VERSION macro.

    Use at your own risk

    Disabling the namespace version component and mixing ABI-incompatible versions will result in crashes or incorrect behavior. You have been warned!

    "},{"location":"features/namespace/#disabling-the-inline-namespace-completely","title":"Disabling the inline namespace completely","text":"

    When interoperability with code using a pre-3.11.0 version of the library is required, users can, at their own risk restore the old namespace layout by redefining NLOHMANN_JSON_NAMESPACE_BEGIN, NLOHMANN_JSON_NAMESPACE_END as follows:

    #define NLOHMANN_JSON_NAMESPACE_BEGIN  namespace nlohmann {\n#define NLOHMANN_JSON_NAMESPACE_END    }\n

    Use at your own risk

    Overriding the namespace and mixing ABI-incompatible versions will result in crashes or incorrect behavior. You have been warned!

    "},{"location":"features/namespace/#version-history","title":"Version history","text":"
    • Introduced inline namespace (json_v3_11_0[_abi-tag]*) in version 3.11.0.
    • Changed structure of inline namespace in version 3.11.2.
    "},{"location":"features/object_order/","title":"Object Order","text":"

    The JSON standard defines objects as \"an unordered collection of zero or more name/value pairs\". As such, an implementation does not need to preserve any specific order of object keys.

    "},{"location":"features/object_order/#default-behavior-sort-keys","title":"Default behavior: sort keys","text":"

    The default type nlohmann::json uses a std::map to store JSON objects, and thus stores object keys sorted alphabetically.

    Example 
    #include <iostream>\n#include \"json.hpp\"\n\nusing json = nlohmann::json;\n\nint main()\n{\n    json j;\n    j[\"one\"] = 1;\n    j[\"two\"] = 2;\n    j[\"three\"] = 3;\n\n    std::cout << j.dump(2) << '\\n';\n}\n

    Output:

    {\n  \"one\": 1,\n  \"three\": 3,\n  \"two\": 2\n}\n
    "},{"location":"features/object_order/#alternative-behavior-preserve-insertion-order","title":"Alternative behavior: preserve insertion order","text":"

    If you do want to preserve the insertion order, you can try the type nlohmann::ordered_json.

    Example 
    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing ordered_json = nlohmann::ordered_json;\n\nint main()\n{\n    ordered_json j;\n    j[\"one\"] = 1;\n    j[\"two\"] = 2;\n    j[\"three\"] = 3;\n\n    std::cout << j.dump(2) << '\\n';\n}\n

    Output:

    {\n  \"one\": 1,\n  \"two\": 2,\n  \"three\": 3\n}\n

    Alternatively, you can use a more sophisticated ordered map like tsl::ordered_map (integration) or nlohmann::fifo_map (integration).

    "},{"location":"features/object_order/#notes-on-parsing","title":"Notes on parsing","text":"

    Note that you also need to call the right parse function when reading from a file. Assume file input.json contains the JSON object above:

    {\n  \"one\": 1,\n  \"two\": 2,\n  \"three\": 3\n}\n

    Right way

    The following code correctly calls the parse function from nlohmann::ordered_json:

    std::ifstream i(\"input.json\");\nauto j = nlohmann::ordered_json::parse(i);\nstd::cout << j.dump(2) << std::endl;\n

    The output will be:

    {\n  \"one\": 1,\n  \"two\": 2,\n  \"three\": 3\n}\n
    Wrong way

    The following code incorrectly calls the parse function from nlohmann::json which does not preserve the insertion order, but sorts object keys. Assigning the result to nlohmann::ordered_json compiles, but does not restore the order from the input file.

    std::ifstream i(\"input.json\");\nnlohmann::ordered_json j = nlohmann::json::parse(i);\nstd::cout << j.dump(2) << std::endl;\n

    The output will be:

    {\n  \"one\": 1,\n  \"three\": 3\n  \"two\": 2,\n}\n
    "},{"location":"features/trailing_commas/","title":"Trailing Commas","text":"

    Like comments, this library does not support trailing commas in arrays and objects by default.

    You can set parameter ignore_trailing_commas to true in the parse function to allow trailing commas in arrays and objects. Note that a single comma as the only content of the array or object ([,] or {,}) is not allowed, and multiple trailing commas ([1,,]) are not allowed either.

    This library does not add trailing commas when serializing JSON data.

    For more information, see JSON With Commas and Comments (JWCC).

    Example

    Consider the following JSON with trailing commas.

    {\n    \"planets\": [\n        \"Mercury\",\n        \"Venus\",\n        \"Earth\",\n        \"Mars\",\n        \"Jupiter\",\n        \"Uranus\",\n        \"Neptune\",\n    ]\n}\n

    When calling parse without additional argument, a parse error exception is thrown. If ignore_trailing_commas is set to true, the trailing commas are ignored during parsing:

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    std::string s = R\"(\n    {\n        \"planets\": [\n            \"Mercury\",\n            \"Venus\",\n            \"Earth\",\n            \"Mars\",\n            \"Jupiter\",\n            \"Uranus\",\n            \"Neptune\",\n        ]\n    }\n    )\";\n\n    try\n    {\n        json j = json::parse(s);\n    }\n    catch (json::exception& e)\n    {\n        std::cout << e.what() << std::endl;\n    }\n\n    json j = json::parse(s,\n                         /* callback */ nullptr,\n                         /* allow exceptions */ true,\n                         /* ignore_comments */ false,\n                         /* ignore_trailing_commas */ true);\n    std::cout << j.dump(2) << '\\n';\n}\n

    Output:

    [json.exception.parse_error.101] parse error at line 11, column 9: syntax error while parsing value - unexpected ']'; expected '[', '{', or a literal\n{\n  \"planets\": [\n    \"Mercury\",\n    \"Venus\",\n    \"Earth\",\n    \"Mars\",\n    \"Jupiter\",\n    \"Uranus\",\n    \"Neptune\"\n  ]\n}\n
    "},{"location":"features/binary_formats/","title":"Binary Formats","text":"

    Though JSON is a ubiquitous data format, it is not a very compact format suitable for data exchange, for instance, over a network. Hence, the library supports

    • BJData (Binary JData),
    • BSON (Binary JSON),
    • CBOR (Concise Binary Object Representation),
    • MessagePack, and
    • UBJSON (Universal Binary JSON)

    to efficiently encode JSON values to byte vectors and to decode such vectors.

    "},{"location":"features/binary_formats/#comparison","title":"Comparison","text":""},{"location":"features/binary_formats/#completeness","title":"Completeness","text":"Format Serialization Deserialization BJData complete complete BSON incomplete: top-level value must be an object incomplete, but all JSON types are supported CBOR complete incomplete, but all JSON types are supported MessagePack complete complete UBJSON complete complete"},{"location":"features/binary_formats/#binary-values","title":"Binary values","text":"Format Binary values Binary subtypes BJData not supported not supported BSON supported supported CBOR supported supported MessagePack supported supported UBJSON not supported not supported

    See binary values for more information.

    "},{"location":"features/binary_formats/#sizes","title":"Sizes","text":"Format canada.json twitter.json citm_catalog.json jeopardy.json BJData 53.2 % 91.1 % 78.1 % 96.6 % BJData (size) 58.6 % 92.1 % 86.7 % 97.4 % BJData (size+tyoe) 58.6 % 92.1 % 86.5 % 97.4 % BSON 85.8 % 95.2 % 95.8 % 106.7 % CBOR 50.5 % 86.3 % 68.4 % 88.0 % MessagePack 50.5 % 86.0 % 68.5 % 87.9 % UBJSON 53.2 % 91.3 % 78.2 % 96.6 % UBJSON (size) 58.6 % 92.3 % 86.8 % 97.4 % UBJSON (size+type) 55.9 % 92.3 % 85.0 % 95.0 %

    Sizes compared to minified JSON value.

    "},{"location":"features/binary_formats/bjdata/","title":"BJData","text":"

    The BJData format was derived from and improved upon Universal Binary JSON(UBJSON) specification (Draft 12). Specifically, it introduces an optimized array container for efficient storage of N-dimensional packed arrays (ND-arrays); it also adds 5 new type markers - [u] - uint16, [m] - uint32, [M] - uint64, [h] - float16 and [B] - byte - to unambiguously map common binary numeric types; furthermore, it uses little-endian (LE) to store all numerics instead of big-endian (BE) as in UBJSON to avoid unnecessary conversions on commonly available platforms.

    Compared to other binary JSON-like formats such as MessagePack and CBOR, both BJData and UBJSON demonstrate a rare combination of being both binary and quasi-human-readable. This is because all semantic elements in BJData and UBJSON, including the data-type markers and name/string types, are directly human-readable. Data stored in the BJData/UBJSON format is not only compact in size, fast to read/write, but also can be directly searched or read using simple processing.

    References

    • BJData Specification
    "},{"location":"features/binary_formats/bjdata/#serialization","title":"Serialization","text":"

    The library uses the following mapping from JSON values types to BJData types according to the BJData specification:

    JSON value type value/range BJData type marker null null null Z boolean true true T boolean false false F number_integer -9223372036854775808..-2147483649 int64 L number_integer -2147483648..-32769 int32 l number_integer -32768..-129 int16 I number_integer -128..127 int8 i number_integer 128..255 uint8 U number_integer 256..32767 int16 I number_integer 32768..65535 uint16 u number_integer 65536..2147483647 int32 l number_integer 2147483648..4294967295 uint32 m number_integer 4294967296..9223372036854775807 int64 L number_integer 9223372036854775808..18446744073709551615 uint64 M number_unsigned 0..127 int8 i number_unsigned 128..255 uint8 U number_unsigned 256..32767 int16 I number_unsigned 32768..65535 uint16 u number_unsigned 65536..2147483647 int32 l number_unsigned 2147483648..4294967295 uint32 m number_unsigned 4294967296..9223372036854775807 int64 L number_unsigned 9223372036854775808..18446744073709551615 uint64 M number_float any value float64 D string with shortest length indicator string S array see notes on optimized format/ND-array array [ object see notes on optimized format map { binary see notes on binary values array [$B

    Complete mapping

    The mapping is complete in the sense that any JSON value type can be converted to a BJData value.

    Any BJData output created by to_bjdata can be successfully parsed by from_bjdata.

    Size constraints

    The following values can not be converted to a BJData value:

    • strings with more than 18446744073709551615 bytes, i.e., 2^{64}-1 bytes (theoretical)

    Unused BJData markers

    The following markers are not used in the conversion:

    • Z: no-op values are not created.
    • C: single-byte strings are serialized with S markers.

    NaN/infinity handling

    If NaN or Infinity are stored inside a JSON number, they are serialized properly. This behavior differs from the dump() function which serializes NaN or Infinity to null.

    Endianness

    A breaking difference between BJData and UBJSON is the endianness of numerical values. In BJData, all numerical data types (integers UiuImlML and floating-point values hdD) are stored in the little-endian (LE) byte order as opposed to big-endian as used by UBJSON. Adopting LE to store numeric records avoids unnecessary byte swapping on most modern computers where LE is used as the default byte order.

    Optimized formats

    Optimized formats for containers are supported via two parameters of to_bjdata:

    • Parameter use_size adds size information to the beginning of a container and removes the closing marker.
    • Parameter use_type further checks whether all elements of a container have the same type and adds the type marker to the beginning of the container. The use_type parameter must only be used together with use_size = true.

    Note that use_size = true alone may result in larger representations - the benefit of this parameter is that the receiving side is immediately informed of the number of elements in the container.

    ND-array optimized format

    BJData extends UBJSON's optimized array size marker to support ND-arrays of uniform numerical data types (referred to as packed arrays). For example, the 2-D uint8 integer array [[1,2],[3,4],[5,6]], stored as nested optimized array in UBJSON [ [$U#i2 1 2 [$U#i2 3 4 [$U#i2 5 6 ], can be further compressed in BJData to [$U#[$i#i2 2 3 1 2 3 4 5 6 or [$U#[i2 i3] 1 2 3 4 5 6.

    To maintain type and size information, ND-arrays are converted to JSON objects following the annotated array format (defined in the JData specification (Draft 3)), when parsed using from_bjdata. For example, the above 2-D uint8 array can be parsed and accessed as

    {\n    \"_ArrayType_\": \"uint8\",\n    \"_ArraySize_\": [2,3],\n    \"_ArrayData_\": [1,2,3,4,5,6]\n}\n

    Likewise, when a JSON object in the above form is serialzed using to_bjdata, it is automatically converted into a compact BJData ND-array. The only exception is, that when the 1-dimensional vector stored in \"_ArraySize_\" contains a single integer or two integers with one being 1, a regular 1-D optimized array is generated.

    The current version of this library does not yet support automatic detection of and conversion from a nested JSON array input to a BJData ND-array.

    Restrictions in optimized data types for arrays and objects

    Due to diminished space saving, hampered readability, and increased security risks, in BJData, the allowed data types following the $ marker in an optimized array and object container are restricted to non-zero-fixed-length data types. Therefore, the valid optimized type markers can only be one of UiuImlMLhdDCB. This also means other variable ([{SH) or zero-length types (TFN) can not be used in an optimized array or object in BJData.

    Binary values

    BJData provides a dedicated B marker (defined in the BJData specification (Draft 3)) that is used in optimized arrays to designate binary data. This means that, unlike UBJSON, binary data can be both serialized and deserialized.

    To preserve compatibility with BJData Draft 2, the Draft 3 optimized binary array must be explicitly enabled using the version parameter of to_bjdata.

    In Draft2 mode (default), if the JSON data contains the binary type, the value stored as a list of integers, as suggested by the BJData documentation. In particular, this means that the serialization and the deserialization of JSON containing binary values into BJData and back will result in a different JSON object.

    Example 
    #include <iostream>\n#include <iomanip>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\nusing namespace nlohmann::literals;\n\n// function to print BJData's diagnostic format\nvoid print_byte(uint8_t byte)\n{\n    if (32 < byte and byte < 128)\n    {\n        std::cout << (char)byte;\n    }\n    else\n    {\n        std::cout << (int)byte;\n    }\n}\n\nint main()\n{\n    // create a JSON value\n    json j = R\"({\"compact\": true, \"schema\": false})\"_json;\n\n    // serialize it to BJData\n    std::vector<std::uint8_t> v = json::to_bjdata(j);\n\n    // print the vector content\n    for (auto& byte : v)\n    {\n        print_byte(byte);\n    }\n    std::cout << std::endl;\n\n    // create an array of numbers\n    json array = {1, 2, 3, 4, 5, 6, 7, 8};\n\n    // serialize it to BJData using default representation\n    std::vector<std::uint8_t> v_array = json::to_bjdata(array);\n    // serialize it to BJData using size optimization\n    std::vector<std::uint8_t> v_array_size = json::to_bjdata(array, true);\n    // serialize it to BJData using type optimization\n    std::vector<std::uint8_t> v_array_size_and_type = json::to_bjdata(array, true, true);\n\n    // print the vector contents\n    for (auto& byte : v_array)\n    {\n        print_byte(byte);\n    }\n    std::cout << std::endl;\n\n    for (auto& byte : v_array_size)\n    {\n        print_byte(byte);\n    }\n    std::cout << std::endl;\n\n    for (auto& byte : v_array_size_and_type)\n    {\n        print_byte(byte);\n    }\n    std::cout << std::endl;\n}\n

    Output:

    {i7compactTi6schemaF}\n[i1i2i3i4i5i6i7i8]\n[#i8i1i2i3i4i5i6i7i8\n[$i#i812345678\n
    "},{"location":"features/binary_formats/bjdata/#deserialization","title":"Deserialization","text":"

    The library maps BJData types to JSON value types as follows:

    BJData type JSON value type marker no-op no value, next value is read N null null Z false false F true true T float16 number_float h float32 number_float d float64 number_float D uint8 number_unsigned U int8 number_integer i uint16 number_unsigned u int16 number_integer I uint32 number_unsigned m int32 number_integer l uint64 number_unsigned M int64 number_integer L byte number_unsigned B string string S char string C array array (optimized values are supported) [ ND-array object (in JData annotated array format) [$.#[. object object (optimized values are supported) { binary binary (strongly-typed byte array) [$B

    Complete mapping

    The mapping is complete in the sense that any BJData value can be converted to a JSON value.

    Example 
    #include <iostream>\n#include <iomanip>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // create byte vector\n    std::vector<std::uint8_t> v = {0x7B, 0x69, 0x07, 0x63, 0x6F, 0x6D, 0x70, 0x61,\n                                   0x63, 0x74, 0x54, 0x69, 0x06, 0x73, 0x63, 0x68,\n                                   0x65, 0x6D, 0x61, 0x69, 0x00, 0x7D\n                                  };\n\n    // deserialize it with BJData\n    json j = json::from_bjdata(v);\n\n    // print the deserialized JSON value\n    std::cout << std::setw(2) << j << std::endl;\n}\n

    Output:

    {\n  \"compact\": true,\n  \"schema\": 0\n}\n
    "},{"location":"features/binary_formats/bson/","title":"BSON","text":"

    BSON, short for Binary JSON, is a binary-encoded serialization of JSON-like documents. Like JSON, BSON supports the embedding of documents and arrays within other documents and arrays. BSON also contains extensions that allow representation of data types that are not part of the JSON spec. For example, BSON has a Date type and a BinData type.

    References

    • BSON Website - the main source on BSON
    • BSON Specification - the specification
    "},{"location":"features/binary_formats/bson/#serialization","title":"Serialization","text":"

    The library uses the following mapping from JSON values types to BSON types:

    JSON value type value/range BSON type marker null null null 0x0A boolean true, false boolean 0x08 number_integer -9223372036854775808..-2147483649 int64 0x12 number_integer -2147483648..2147483647 int32 0x10 number_integer 2147483648..9223372036854775807 int64 0x12 number_unsigned 0..2147483647 int32 0x10 number_unsigned 2147483648..9223372036854775807 int64 0x12 number_unsigned 9223372036854775808..18446744073709551615 uint64 0x11 number_float any value double 0x01 string any value string 0x02 array any value document 0x04 object any value document 0x03 binary any value binary 0x05

    Incomplete mapping

    The mapping is incomplete, since only JSON-objects (and things contained therein) can be serialized to BSON. Also, keys may not contain U+0000, since they are serialized a zero-terminated c-strings.

    Example 
    #include <iostream>\n#include <iomanip>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\nusing namespace nlohmann::literals;\n\nint main()\n{\n    // create a JSON value\n    json j = R\"({\"compact\": true, \"schema\": 0})\"_json;\n\n    // serialize it to BSON\n    std::vector<std::uint8_t> v = json::to_bson(j);\n\n    // print the vector content\n    for (auto& byte : v)\n    {\n        std::cout << \"0x\" << std::hex << std::setw(2) << std::setfill('0') << (int)byte << \" \";\n    }\n    std::cout << std::endl;\n}\n

    Output:

    0x1b 0x00 0x00 0x00 0x08 0x63 0x6f 0x6d 0x70 0x61 0x63 0x74 0x00 0x01 0x10 0x73 0x63 0x68 0x65 0x6d 0x61 0x00 0x00 0x00 0x00 0x00 0x00 \n
    "},{"location":"features/binary_formats/bson/#deserialization","title":"Deserialization","text":"

    The library maps BSON record types to JSON value types as follows:

    BSON type BSON marker byte JSON value type double 0x01 number_float string 0x02 string document 0x03 object array 0x04 array binary 0x05 binary undefined 0x06 unsupported ObjectId 0x07 unsupported boolean 0x08 boolean UTC Date-Time 0x09 unsupported null 0x0A null Regular Expr. 0x0B unsupported DB Pointer 0x0C unsupported JavaScript Code 0x0D unsupported Symbol 0x0E unsupported JavaScript Code 0x0F unsupported int32 0x10 number_integer uint64(Timestamp) 0x11 number_unsigned 128-bit decimal float 0x13 unsupported Max Key 0x7F unsupported Min Key 0xFF unsupported

    Incomplete mapping

    The mapping is incomplete. The unsupported mappings are indicated in the table above.

    Handling of BSON type 0x11

    BSON type 0x11 is used to represent uint64 numbers. This library treats these values purely as uint64 numbers and does not parse them into date-related formats.

    Example 
    #include <iostream>\n#include <iomanip>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // create byte vector\n    std::vector<std::uint8_t> v = {0x1b, 0x00, 0x00, 0x00, 0x08, 0x63, 0x6f, 0x6d,\n                                   0x70, 0x61, 0x63, 0x74, 0x00, 0x01, 0x10, 0x73,\n                                   0x63, 0x68, 0x65, 0x6d, 0x61, 0x00, 0x00, 0x00,\n                                   0x00, 0x00, 0x00\n                                  };\n\n    // deserialize it with BSON\n    json j = json::from_bson(v);\n\n    // print the deserialized JSON value\n    std::cout << std::setw(2) << j << std::endl;\n}\n

    Output:

    {\n  \"compact\": true,\n  \"schema\": 0\n}\n
    "},{"location":"features/binary_formats/cbor/","title":"CBOR","text":"

    The Concise Binary Object Representation (CBOR) is a data format whose design goals include the possibility of extremely small code sizes, fairly small message size, and extensibility without the need for version negotiation.

    References

    • CBOR Website - the main source on CBOR
    • CBOR Playground - an interactive webpage to translate between JSON and CBOR
    • RFC 7049 - the CBOR specification
    "},{"location":"features/binary_formats/cbor/#serialization","title":"Serialization","text":"

    The library uses the following mapping from JSON values types to CBOR types according to the CBOR specification (RFC 7049):

    JSON value type value/range CBOR type first byte null null Null 0xF6 boolean true True 0xF5 boolean false False 0xF4 number_integer -9223372036854775808..-2147483649 Negative integer (8 bytes follow) 0x3B number_integer -2147483648..-32769 Negative integer (4 bytes follow) 0x3A number_integer -32768..-129 Negative integer (2 bytes follow) 0x39 number_integer -128..-25 Negative integer (1 byte follow) 0x38 number_integer -24..-1 Negative integer 0x20..0x37 number_integer 0..23 Integer 0x00..0x17 number_integer 24..255 Unsigned integer (1 byte follow) 0x18 number_integer 256..65535 Unsigned integer (2 bytes follow) 0x19 number_integer 65536..4294967295 Unsigned integer (4 bytes follow) 0x1A number_integer 4294967296..18446744073709551615 Unsigned integer (8 bytes follow) 0x1B number_unsigned 0..23 Integer 0x00..0x17 number_unsigned 24..255 Unsigned integer (1 byte follow) 0x18 number_unsigned 256..65535 Unsigned integer (2 bytes follow) 0x19 number_unsigned 65536..4294967295 Unsigned integer (4 bytes follow) 0x1A number_unsigned 4294967296..18446744073709551615 Unsigned integer (8 bytes follow) 0x1B number_float any value representable by a float Single-Precision Float 0xFA number_float any value NOT representable by a float Double-Precision Float 0xFB string length: 0..23 UTF-8 string 0x60..0x77 string length: 23..255 UTF-8 string (1 byte follow) 0x78 string length: 256..65535 UTF-8 string (2 bytes follow) 0x79 string length: 65536..4294967295 UTF-8 string (4 bytes follow) 0x7A string length: 4294967296..18446744073709551615 UTF-8 string (8 bytes follow) 0x7B array size: 0..23 array 0x80..0x97 array size: 23..255 array (1 byte follow) 0x98 array size: 256..65535 array (2 bytes follow) 0x99 array size: 65536..4294967295 array (4 bytes follow) 0x9A array size: 4294967296..18446744073709551615 array (8 bytes follow) 0x9B object size: 0..23 map 0xA0..0xB7 object size: 23..255 map (1 byte follow) 0xB8 object size: 256..65535 map (2 bytes follow) 0xB9 object size: 65536..4294967295 map (4 bytes follow) 0xBA object size: 4294967296..18446744073709551615 map (8 bytes follow) 0xBB binary size: 0..23 byte string 0x40..0x57 binary size: 23..255 byte string (1 byte follow) 0x58 binary size: 256..65535 byte string (2 bytes follow) 0x59 binary size: 65536..4294967295 byte string (4 bytes follow) 0x5A binary size: 4294967296..18446744073709551615 byte string (8 bytes follow) 0x5B

    Binary values with subtype are mapped to tagged values (0xD8..0xDB) depending on the subtype, followed by a byte string, see \"binary\" cells in the table above.

    Complete mapping

    The mapping is complete in the sense that any JSON value type can be converted to a CBOR value.

    NaN/infinity handling

    If NaN or Infinity are stored inside a JSON number, they are serialized properly. This behavior differs from the normal JSON serialization which serializes NaN or Infinity to null.

    Unused CBOR types

    The following CBOR types are not used in the conversion:

    • UTF-8 strings terminated by \"break\" (0x7F)
    • arrays terminated by \"break\" (0x9F)
    • maps terminated by \"break\" (0xBF)
    • byte strings terminated by \"break\" (0x5F)
    • date/time (0xC0..0xC1)
    • bignum (0xC2..0xC3)
    • decimal fraction (0xC4)
    • bigfloat (0xC5)
    • expected conversions (0xD5..0xD7)
    • simple values (0xE0..0xF3, 0xF8)
    • undefined (0xF7)
    • half-precision floats (0xF9)
    • break (0xFF)

    Tagged items

    Binary subtypes will be serialized as tagged items. See binary values for an example.

    Example 
    #include <iostream>\n#include <iomanip>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\nusing namespace nlohmann::literals;\n\nint main()\n{\n    // create a JSON value\n    json j = R\"({\"compact\": true, \"schema\": 0})\"_json;\n\n    // serialize it to CBOR\n    std::vector<std::uint8_t> v = json::to_cbor(j);\n\n    // print the vector content\n    for (auto& byte : v)\n    {\n        std::cout << \"0x\" << std::hex << std::setw(2) << std::setfill('0') << (int)byte << \" \";\n    }\n    std::cout << std::endl;\n}\n

    Output:

    0xa2 0x67 0x63 0x6f 0x6d 0x70 0x61 0x63 0x74 0xf5 0x66 0x73 0x63 0x68 0x65 0x6d 0x61 0x00 \n
    "},{"location":"features/binary_formats/cbor/#deserialization","title":"Deserialization","text":"

    The library maps CBOR types to JSON value types as follows:

    CBOR type JSON value type first byte Integer number_unsigned 0x00..0x17 Unsigned integer number_unsigned 0x18 Unsigned integer number_unsigned 0x19 Unsigned integer number_unsigned 0x1A Unsigned integer number_unsigned 0x1B Negative integer number_integer 0x20..0x37 Negative integer number_integer 0x38 Negative integer number_integer 0x39 Negative integer number_integer 0x3A Negative integer number_integer 0x3B Byte string binary 0x40..0x57 Byte string binary 0x58 Byte string binary 0x59 Byte string binary 0x5A Byte string binary 0x5B UTF-8 string string 0x60..0x77 UTF-8 string string 0x78 UTF-8 string string 0x79 UTF-8 string string 0x7A UTF-8 string string 0x7B UTF-8 string string 0x7F array array 0x80..0x97 array array 0x98 array array 0x99 array array 0x9A array array 0x9B array array 0x9F map object 0xA0..0xB7 map object 0xB8 map object 0xB9 map object 0xBA map object 0xBB map object 0xBF False false 0xF4 True true 0xF5 Null null 0xF6 Half-Precision Float number_float 0xF9 Single-Precision Float number_float 0xFA Double-Precision Float number_float 0xFB

    Incomplete mapping

    The mapping is incomplete in the sense that not all CBOR types can be converted to a JSON value. The following CBOR types are not supported and will yield parse errors:

    • date/time (0xC0..0xC1)
    • bignum (0xC2..0xC3)
    • decimal fraction (0xC4)
    • bigfloat (0xC5)
    • expected conversions (0xD5..0xD7)
    • simple values (0xE0..0xF3, 0xF8)
    • undefined (0xF7)

    Object keys

    CBOR allows map keys of any type, whereas JSON only allows strings as keys in object values. Therefore, CBOR maps with keys other than UTF-8 strings are rejected.

    Tagged items

    Tagged items will throw a parse error by default. They can be ignored by passing cbor_tag_handler_t::ignore to function from_cbor. They can be stored by passing cbor_tag_handler_t::store to function from_cbor.

    Example 
    #include <iostream>\n#include <iomanip>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // create byte vector\n    std::vector<std::uint8_t> v = {0xa2, 0x67, 0x63, 0x6f, 0x6d, 0x70, 0x61, 0x63,\n                                   0x74, 0xf5, 0x66, 0x73, 0x63, 0x68, 0x65, 0x6d,\n                                   0x61, 0x00\n                                  };\n\n    // deserialize it with CBOR\n    json j = json::from_cbor(v);\n\n    // print the deserialized JSON value\n    std::cout << std::setw(2) << j << std::endl;\n}\n

    Output:

    {\n  \"compact\": true,\n  \"schema\": 0\n}\n
    "},{"location":"features/binary_formats/messagepack/","title":"MessagePack","text":"

    MessagePack is an efficient binary serialization format. It lets you exchange data among multiple languages like JSON. But it's faster and smaller. Small integers are encoded into a single byte, and typical short strings require only one extra byte in addition to the strings themselves.

    References

    • MessagePack website
    • MessagePack specification
    "},{"location":"features/binary_formats/messagepack/#serialization","title":"Serialization","text":"

    The library uses the following mapping from JSON values types to MessagePack types according to the MessagePack specification:

    JSON value type value/range MessagePack type first byte null null nil 0xC0 boolean true true 0xC3 boolean false false 0xC2 number_integer -9223372036854775808..-2147483649 int64 0xD3 number_integer -2147483648..-32769 int32 0xD2 number_integer -32768..-129 int16 0xD1 number_integer -128..-33 int8 0xD0 number_integer -32..-1 negative fixint 0xE0..0xFF number_integer 0..127 positive fixint 0x00..0x7F number_integer 128..255 uint 8 0xCC number_integer 256..65535 uint 16 0xCD number_integer 65536..4294967295 uint 32 0xCE number_integer 4294967296..18446744073709551615 uint 64 0xCF number_unsigned 0..127 positive fixint 0x00..0x7F number_unsigned 128..255 uint 8 0xCC number_unsigned 256..65535 uint 16 0xCD number_unsigned 65536..4294967295 uint 32 0xCE number_unsigned 4294967296..18446744073709551615 uint 64 0xCF number_float any value representable by a float float 32 0xCA number_float any value NOT representable by a float float 64 0xCB string length: 0..31 fixstr 0xA0..0xBF string length: 32..255 str 8 0xD9 string length: 256..65535 str 16 0xDA string length: 65536..4294967295 str 32 0xDB array size: 0..15 fixarray 0x90..0x9F array size: 16..65535 array 16 0xDC array size: 65536..4294967295 array 32 0xDD object size: 0..15 fix map 0x80..0x8F object size: 16..65535 map 16 0xDE object size: 65536..4294967295 map 32 0xDF binary size: 0..255 bin 8 0xC4 binary size: 256..65535 bin 16 0xC5 binary size: 65536..4294967295 bin 32 0xC6

    Complete mapping

    The mapping is complete in the sense that any JSON value type can be converted to a MessagePack value.

    Any MessagePack output created by to_msgpack can be successfully parsed by from_msgpack.

    Size constraints

    The following values can not be converted to a MessagePack value:

    • strings with more than 4294967295 bytes
    • byte strings with more than 4294967295 bytes
    • arrays with more than 4294967295 elements
    • objects with more than 4294967295 elements

    NaN/infinity handling

    If NaN or Infinity are stored inside a JSON number, they are serialized properly in contrast to the dump function which serializes NaN or Infinity to null.

    Example 
    #include <iostream>\n#include <iomanip>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\nusing namespace nlohmann::literals;\n\nint main()\n{\n    // create a JSON value\n    json j = R\"({\"compact\": true, \"schema\": 0})\"_json;\n\n    // serialize it to MessagePack\n    std::vector<std::uint8_t> v = json::to_msgpack(j);\n\n    // print the vector content\n    for (auto& byte : v)\n    {\n        std::cout << \"0x\" << std::hex << std::setw(2) << std::setfill('0') << (int)byte << \" \";\n    }\n    std::cout << std::endl;\n}\n

    Output:

    0x82 0xa7 0x63 0x6f 0x6d 0x70 0x61 0x63 0x74 0xc3 0xa6 0x73 0x63 0x68 0x65 0x6d 0x61 0x00 \n
    "},{"location":"features/binary_formats/messagepack/#deserialization","title":"Deserialization","text":"

    The library maps MessagePack types to JSON value types as follows:

    MessagePack type JSON value type first byte positive fixint number_unsigned 0x00..0x7F fixmap object 0x80..0x8F fixarray array 0x90..0x9F fixstr string 0xA0..0xBF nil null 0xC0 false false 0xC2 true true 0xC3 float 32 number_float 0xCA float 64 number_float 0xCB uint 8 number_unsigned 0xCC uint 16 number_unsigned 0xCD uint 32 number_unsigned 0xCE uint 64 number_unsigned 0xCF int 8 number_integer 0xD0 int 16 number_integer 0xD1 int 32 number_integer 0xD2 int 64 number_integer 0xD3 str 8 string 0xD9 str 16 string 0xDA str 32 string 0xDB array 16 array 0xDC array 32 array 0xDD map 16 object 0xDE map 32 object 0xDF bin 8 binary 0xC4 bin 16 binary 0xC5 bin 32 binary 0xC6 ext 8 binary 0xC7 ext 16 binary 0xC8 ext 32 binary 0xC9 fixext 1 binary 0xD4 fixext 2 binary 0xD5 fixext 4 binary 0xD6 fixext 8 binary 0xD7 fixext 16 binary 0xD8 negative fixint number_integer 0xE0-0xFF

    Info

    Any MessagePack output created by to_msgpack can be successfully parsed by from_msgpack.

    Example 
    #include <iostream>\n#include <iomanip>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // create byte vector\n    std::vector<std::uint8_t> v = {0x82, 0xa7, 0x63, 0x6f, 0x6d, 0x70, 0x61, 0x63,\n                                   0x74, 0xc3, 0xa6, 0x73, 0x63, 0x68, 0x65, 0x6d,\n                                   0x61, 0x00\n                                  };\n\n    // deserialize it with MessagePack\n    json j = json::from_msgpack(v);\n\n    // print the deserialized JSON value\n    std::cout << std::setw(2) << j << std::endl;\n}\n

    Output:

    {\n  \"compact\": true,\n  \"schema\": 0\n}\n
    "},{"location":"features/binary_formats/ubjson/","title":"UBJSON","text":"

    Universal Binary JSON (UBJSON) is a binary form directly imitating JSON, but requiring fewer bytes of data. It aims to achieve the generality of JSON, combined with being much easier to process than JSON.

    References

    • UBJSON Website
    "},{"location":"features/binary_formats/ubjson/#serialization","title":"Serialization","text":"

    The library uses the following mapping from JSON values types to UBJSON types according to the UBJSON specification:

    JSON value type value/range UBJSON type marker null null null Z boolean true true T boolean false false F number_integer -9223372036854775808..-2147483649 int64 L number_integer -2147483648..-32769 int32 l number_integer -32768..-129 int16 I number_integer -128..127 int8 i number_integer 128..255 uint8 U number_integer 256..32767 int16 I number_integer 32768..2147483647 int32 l number_integer 2147483648..9223372036854775807 int64 L number_unsigned 0..127 int8 i number_unsigned 128..255 uint8 U number_unsigned 256..32767 int16 I number_unsigned 32768..2147483647 int32 l number_unsigned 2147483648..9223372036854775807 int64 L number_unsigned 2147483649..18446744073709551615 high-precision H number_float any value float64 D string with shortest length indicator string S array see notes on optimized format array [ object see notes on optimized format map {

    Complete mapping

    The mapping is complete in the sense that any JSON value type can be converted to a UBJSON value.

    Any UBJSON output created by to_ubjson can be successfully parsed by from_ubjson.

    Size constraints

    The following values can not be converted to a UBJSON value:

    • strings with more than 9223372036854775807 bytes (theoretical)

    Unused UBJSON markers

    The following markers are not used in the conversion:

    • Z: no-op values are not created.
    • C: single-byte strings are serialized with S markers.

    NaN/infinity handling

    If NaN or Infinity are stored inside a JSON number, they are serialized properly. This behavior differs from the dump() function which serializes NaN or Infinity to null.

    Optimized formats

    The optimized formats for containers are supported: Parameter use_size adds size information to the beginning of a container and removes the closing marker. Parameter use_type further checks whether all elements of a container have the same type and adds the type marker to the beginning of the container. The use_type parameter must only be used together with use_size = true.

    Note that use_size = true alone may result in larger representations - the benefit of this parameter is that the receiving side is immediately informed on the number of elements of the container.

    Binary values

    If the JSON data contains the binary type, the value stored is a list of integers, as suggested by the UBJSON documentation. In particular, this means that serialization and the deserialization of a JSON containing binary values into UBJSON and back will result in a different JSON object.

    Example 
    #include <iostream>\n#include <iomanip>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\nusing namespace nlohmann::literals;\n\n// function to print UBJSON's diagnostic format\nvoid print_byte(uint8_t byte)\n{\n    if (32 < byte and byte < 128)\n    {\n        std::cout << (char)byte;\n    }\n    else\n    {\n        std::cout << (int)byte;\n    }\n}\n\nint main()\n{\n    // create a JSON value\n    json j = R\"({\"compact\": true, \"schema\": false})\"_json;\n\n    // serialize it to UBJSON\n    std::vector<std::uint8_t> v = json::to_ubjson(j);\n\n    // print the vector content\n    for (auto& byte : v)\n    {\n        print_byte(byte);\n    }\n    std::cout << std::endl;\n\n    // create an array of numbers\n    json array = {1, 2, 3, 4, 5, 6, 7, 8};\n\n    // serialize it to UBJSON using default representation\n    std::vector<std::uint8_t> v_array = json::to_ubjson(array);\n    // serialize it to UBJSON using size optimization\n    std::vector<std::uint8_t> v_array_size = json::to_ubjson(array, true);\n    // serialize it to UBJSON using type optimization\n    std::vector<std::uint8_t> v_array_size_and_type = json::to_ubjson(array, true, true);\n\n    // print the vector contents\n    for (auto& byte : v_array)\n    {\n        print_byte(byte);\n    }\n    std::cout << std::endl;\n\n    for (auto& byte : v_array_size)\n    {\n        print_byte(byte);\n    }\n    std::cout << std::endl;\n\n    for (auto& byte : v_array_size_and_type)\n    {\n        print_byte(byte);\n    }\n    std::cout << std::endl;\n}\n

    Output:

    {i7compactTi6schemaF}\n[i1i2i3i4i5i6i7i8]\n[#i8i1i2i3i4i5i6i7i8\n[$i#i812345678\n
    "},{"location":"features/binary_formats/ubjson/#deserialization","title":"Deserialization","text":"

    The library maps UBJSON types to JSON value types as follows:

    UBJSON type JSON value type marker no-op no value, next value is read N null null Z false false F true true T float32 number_float d float64 number_float D uint8 number_unsigned U int8 number_integer i int16 number_integer I int32 number_integer l int64 number_integer L string string S char string C array array (optimized values are supported) [ object object (optimized values are supported) {

    Complete mapping

    The mapping is complete in the sense that any UBJSON value can be converted to a JSON value.

    Example 
    #include <iostream>\n#include <iomanip>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // create byte vector\n    std::vector<std::uint8_t> v = {0x7B, 0x69, 0x07, 0x63, 0x6F, 0x6D, 0x70, 0x61,\n                                   0x63, 0x74, 0x54, 0x69, 0x06, 0x73, 0x63, 0x68,\n                                   0x65, 0x6D, 0x61, 0x69, 0x00, 0x7D\n                                  };\n\n    // deserialize it with UBJSON\n    json j = json::from_ubjson(v);\n\n    // print the deserialized JSON value\n    std::cout << std::setw(2) << j << std::endl;\n}\n

    Output:

    {\n  \"compact\": true,\n  \"schema\": 0\n}\n
    "},{"location":"features/element_access/","title":"Element Access","text":"

    There are many ways elements in a JSON value can be accessed:

    • unchecked access via operator[]
    • checked access via at
    • access with default value via value
    • iterators
    • JSON pointers
    "},{"location":"features/element_access/checked_access/","title":"Checked access: at","text":""},{"location":"features/element_access/checked_access/#overview","title":"Overview","text":"

    The at member function performs checked access; that is, it returns a reference to the desired value if it exists and throws a basic_json::out_of_range exception otherwise.

    Read access

    Consider the following JSON value:

    {\n    \"name\": \"Mary Smith\",\n    \"age\": 42,\n    \"hobbies\": [\"hiking\", \"reading\"]\n}\n

    Assume the value is parsed to a json variable j.

    expression value j {\"name\": \"Mary Smith\", \"age\": 42, \"hobbies\": [\"hiking\", \"reading\"]} j.at(\"name\") \"Mary Smith\" j.at(\"age\") 42 j.at(\"hobbies\") [\"hiking\", \"reading\"] j.at(\"hobbies\").at(0) \"hiking\" j.at(\"hobbies\").at(1) \"reading\"

    The return value is a reference, so it can be modified by the original value.

    Write access 
    j.at(\"name\") = \"John Smith\";\n

    This code produces the following JSON value:

    {\n    \"name\": \"John Smith\",\n    \"age\": 42,\n    \"hobbies\": [\"hiking\", \"reading\"]\n}\n

    When accessing an invalid index (i.e., an index greater than or equal to the array size) or the passed object key is non-existing, an exception is thrown.

    Accessing via invalid index or missing key 
    j.at(\"hobbies\").at(3) = \"cooking\";\n

    This code produces the following exception:

    [json.exception.out_of_range.401] array index 3 is out of range\n

    When you extended diagnostic messages are enabled by defining JSON_DIAGNOSTICS, the exception further gives information where the key or index is missing or out of range.

    [json.exception.out_of_range.401] (/hobbies) array index 3 is out of range\n
    "},{"location":"features/element_access/checked_access/#notes","title":"Notes","text":"

    Exceptions

    • at can only be used with objects (with a string argument) or with arrays (with a numeric argument). For other types, a basic_json::type_error is thrown.
    • basic_json::out_of_range exception exceptions are thrown if the provided key is not found in an object or the provided index is invalid.
    "},{"location":"features/element_access/checked_access/#summary","title":"Summary","text":"scenario non-const value const value access to existing object key reference to existing value is returned const reference to existing value is returned access to valid array index reference to existing value is returned const reference to existing value is returned access to non-existing object key basic_json::out_of_range exception is thrown basic_json::out_of_range exception is thrown access to invalid array index basic_json::out_of_range exception is thrown basic_json::out_of_range exception is thrown"},{"location":"features/element_access/default_value/","title":"Access with default value: value","text":""},{"location":"features/element_access/default_value/#overview","title":"Overview","text":"

    In many situations, such as configuration files, missing values are not exceptional, but may be treated as if a default value was present. For this case, use value(key, default_value) which takes the key you want to access and a default value in case there is no value stored with that key.

    "},{"location":"features/element_access/default_value/#example","title":"Example","text":"Example

    Consider the following JSON value:

    {\n    \"logOutput\": \"result.log\",\n    \"append\": true\n}\n

    Assume the value is parsed to a json variable j.

    expression value j {\"logOutput\": \"result.log\", \"append\": true} j.value(\"logOutput\", \"logfile.log\") \"result.log\" j.value(\"append\", true) true j.value(\"append\", false) true j.value(\"logLevel\", \"verbose\") \"verbose\""},{"location":"features/element_access/default_value/#notes","title":"Notes","text":"

    Exceptions

    • value can only be used with objects. For other types, a basic_json::type_error is thrown.

    Return type

    The value function is a template, and the return type of the function is determined by the type of the provided default value unless otherwise specified. This can have unexpected effects. In the example below, we store a 64-bit unsigned integer. We get exactly that value when using operator[]. However, when we call value and provide 0 as default value, then -1 is returned. The occurs, because 0 has type int which overflows when handling the value 18446744073709551615.

    To address this issue, either provide a correctly typed default value or use the template parameter to specify the desired return type. Note that this issue occurs even when a value is stored at the provided key, and the default value is not used as the return value.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    json j = json::parse(R\"({\"uint64\": 18446744073709551615})\");\n\n    std::cout << \"operator[]:                \" << j[\"uint64\"] << '\\n'\n              << \"default value (int):       \" << j.value(\"uint64\", 0) << '\\n'\n              << \"default value (uint64_t):  \" << j.value(\"uint64\", std::uint64_t(0)) << '\\n'\n              << \"explict return value type: \" << j.value<std::uint64_t>(\"uint64\", 0) << '\\n';\n}\n

    Output:

    operator[]:                18446744073709551615\ndefault value (int):       -1\ndefault value (uint64_t):  18446744073709551615\nexplict return value type: 18446744073709551615\n
    "},{"location":"features/element_access/default_value/#see-also","title":"See also","text":"
    • value for access with default value
    • documentation on checked access
    "},{"location":"features/element_access/unchecked_access/","title":"Unchecked access: operator[]","text":""},{"location":"features/element_access/unchecked_access/#overview","title":"Overview","text":"

    Elements in a JSON object and a JSON array can be accessed via operator[] similar to a std::map and a std::vector, respectively.

    Read access

    Consider the following JSON value:

    {\n    \"name\": \"Mary Smith\",\n    \"age\": 42,\n    \"hobbies\": [\"hiking\", \"reading\"]\n}\n

    Assume the value is parsed to a json variable j.

    expression value j {\"name\": \"Mary Smith\", \"age\": 42, \"hobbies\": [\"hiking\", \"reading\"]} j[\"name\"] \"Mary Smith\" j[\"age\"] 42 j[\"hobbies\"] [\"hiking\", \"reading\"] j[\"hobbies\"][0] \"hiking\" j[\"hobbies\"][1] \"reading\"

    The return value is a reference, so it can modify the original value. In case the passed object key is non-existing, a null value is inserted which can immediately be overwritten.

    Write access 
    j[\"name\"] = \"John Smith\";\nj[\"maidenName\"] = \"Jones\";\n

    This code produces the following JSON value:

    {\n    \"name\": \"John Smith\",\n    \"maidenName\": \"Jones\",\n    \"age\": 42,\n    \"hobbies\": [\"hiking\", \"reading\"]\n}\n

    When accessing an invalid index (i.e., an index greater than or equal to the array size), the JSON array is resized such that the passed index is the new maximal index. Intermediate values are filled with null.

    Filling up arrays with null values 
    j[\"hobbies\"][0] = \"running\";\nj[\"hobbies\"][3] = \"cooking\";\n

    This code produces the following JSON value:

    {\n    \"name\": \"John Smith\",\n    \"maidenName\": \"Jones\",\n    \"age\": 42,\n    \"hobbies\": [\"running\", \"reading\", null, \"cooking\"]\n}\n
    "},{"location":"features/element_access/unchecked_access/#notes","title":"Notes","text":"

    Design rationale

    The library behaves differently to std::vector and std::map:

    • std::vector::operator[] never inserts a new element.
    • std::map::operator[] is not available for const values.

    The type json wraps all JSON value types. It would be impossible to remove operator[] for const objects. At the same time, inserting elements for non-const objects is really convenient as it avoids awkward insert calls. To this end, we decided to have an inserting non-const behavior for both arrays and objects.

    Info

    The access is unchecked. In case the passed object key does not exist or the passed array index is invalid, no exception is thrown.

    Danger

    • It is undefined behavior to access a const object with a non-existing key.
    • It is undefined behavior to access a const array with an invalid index.
    • In debug mode, an assertion will fire in both cases. You can disable assertions by defining the preprocessor symbol NDEBUG or redefine the macro JSON_ASSERT(x). See the documentation on runtime assertions for more information.

    Exceptions

    operator[] can only be used with objects (with a string argument) or with arrays (with a numeric argument). For other types, a basic_json::type_error is thrown.

    "},{"location":"features/element_access/unchecked_access/#summary","title":"Summary","text":"scenario non-const value const value access to existing object key reference to existing value is returned const reference to existing value is returned access to valid array index reference to existing value is returned const reference to existing value is returned access to non-existing object key reference to newly inserted null value is returned undefined behavior; runtime assertion in debug mode access to invalid array index reference to newly inserted null value is returned; any index between previous maximal index and passed index are filled with null undefined behavior; runtime assertion in debug mode"},{"location":"features/parsing/","title":"Parsing","text":"

    Note

    This page is under construction.

    "},{"location":"features/parsing/#input","title":"Input","text":""},{"location":"features/parsing/#sax-vs-dom-parsing","title":"SAX vs. DOM parsing","text":""},{"location":"features/parsing/#exceptions","title":"Exceptions","text":"

    See parsing and exceptions.

    "},{"location":"features/parsing/json_lines/","title":"JSON Lines","text":"

    The JSON Lines format is a text format of newline-delimited JSON. In particular:

    1. The input must be UTF-8 encoded.
    2. Every line must be a valid JSON value.
    3. The line separator must be \\n. As \\r is silently ignored, \\r\\n is also supported.
    4. The final character may be \\n, but is not required to be one.

    JSON Text example

    {\"name\": \"Gilbert\", \"wins\": [[\"straight\", \"7\u2663\"], [\"one pair\", \"10\u2665\"]]}\n{\"name\": \"Alexa\", \"wins\": [[\"two pair\", \"4\u2660\"], [\"two pair\", \"9\u2660\"]]}\n{\"name\": \"May\", \"wins\": []}\n{\"name\": \"Deloise\", \"wins\": [[\"three of a kind\", \"5\u2663\"]]}\n

    JSON Lines input with more than one value is treated as invalid JSON by the parse or accept functions. To process it line by line, functions like std::getline can be used:

    Example: Parse JSON Text input line by line

    The example below demonstrates how JSON Lines can be processed.

    #include <sstream>\n#include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // JSON Lines (see https://jsonlines.org)\n    std::stringstream input;\n    input << R\"({\"name\": \"Gilbert\", \"wins\": [[\"straight\", \"7\u2663\"], [\"one pair\", \"10\u2665\"]]}\n{\"name\": \"Alexa\", \"wins\": [[\"two pair\", \"4\u2660\"], [\"two pair\", \"9\u2660\"]]}\n{\"name\": \"May\", \"wins\": []}\n{\"name\": \"Deloise\", \"wins\": [[\"three of a kind\", \"5\u2663\"]]}\n)\";\n\n    std::string line;\n    while (std::getline(input, line))\n    {\n        std::cout << json::parse(line) << std::endl;\n    }\n}\n

    Output:

    {\"name\":\"Gilbert\",\"wins\":[[\"straight\",\"7\u2663\"],[\"one pair\",\"10\u2665\"]]}\n{\"name\":\"Alexa\",\"wins\":[[\"two pair\",\"4\u2660\"],[\"two pair\",\"9\u2660\"]]}\n{\"name\":\"May\",\"wins\":[]}\n{\"name\":\"Deloise\",\"wins\":[[\"three of a kind\",\"5\u2663\"]]}\n

    Note

    Using operator>> like

    json j;\nwhile (input >> j)\n{\n    std::cout << j << std::endl;\n}\n

    with a JSON Lines input does not work, because the parser will try to parse one value after the last one.

    "},{"location":"features/parsing/parse_exceptions/","title":"Parsing and Exceptions","text":"

    When the input is not valid JSON, an exception of type parse_error is thrown. This exception contains the position in the input where the error occurred, together with a diagnostic message and the last read input token. The exceptions page contains a list of examples for parse error exceptions. In case you process untrusted input, always enclose your code with a try/catch block, like

    json j;\ntry\n{\n    j = json::parse(my_input);\n}\ncatch (json::parse_error& ex)\n{\n    std::cerr << \"parse error at byte \" << ex.byte << std::endl;\n}\n

    In case exceptions are undesired or not supported by the environment, there are different ways to proceed:

    "},{"location":"features/parsing/parse_exceptions/#switch-off-exceptions","title":"Switch off exceptions","text":"

    The parse() function accepts a bool parameter allow_exceptions which controls whether an exception is thrown when a parse error occurs (true, default) or whether a discarded value should be returned (false).

    json j = json::parse(my_input, nullptr, false);\nif (j.is_discarded())\n{\n    std::cerr << \"parse error\" << std::endl;\n}\n

    Note there is no diagnostic information available in this scenario.

    "},{"location":"features/parsing/parse_exceptions/#use-accept-function","title":"Use accept() function","text":"

    Alternatively, function accept() can be used which does not return a json value, but a bool indicating whether the input is valid JSON.

    if (!json::accept(my_input))\n{\n    std::cerr << \"parse error\" << std::endl;\n}\n

    Again, there is no diagnostic information available.

    "},{"location":"features/parsing/parse_exceptions/#user-defined-sax-interface","title":"User-defined SAX interface","text":"

    Finally, you can implement the SAX interface and decide what should happen in case of a parse error.

    This function has the following interface:

    bool parse_error(std::size_t position,\n                 const std::string& last_token,\n                 const json::exception& ex);\n

    The return value indicates whether the parsing should continue, so the function should usually return false.

    Example 
    #include <iostream>\n#include \"json.hpp\"\n\nusing json = nlohmann::json;\n\nclass sax_no_exception : public nlohmann::detail::json_sax_dom_parser<json>\n{\n  public:\n    sax_no_exception(json& j)\n      : nlohmann::detail::json_sax_dom_parser<json>(j, false)\n    {}\n\n    bool parse_error(std::size_t position,\n                     const std::string& last_token,\n                     const json::exception& ex)\n    {\n        std::cerr << \"parse error at input byte \" << position << \"\\n\"\n                  << ex.what() << \"\\n\"\n                  << \"last read: \\\"\" << last_token << \"\\\"\"\n                  << std::endl;\n        return false;\n    }\n};\n\nint main()\n{\n    std::string myinput = \"[1,2,3,]\";\n\n    json result;\n    sax_no_exception sax(result);\n\n    bool parse_result = json::sax_parse(myinput, &sax);\n    if (!parse_result)\n    {\n        std::cerr << \"parsing unsuccessful!\" << std::endl;\n    }\n\n    std::cout << \"parsed value: \" << result << std::endl;\n}\n

    Output:

    parse error at input byte 8\n[json.exception.parse_error.101] parse error at line 1, column 8: syntax error while parsing value - unexpected ']'; expected '[', '{', or a literal\nlast read: \"3,]\"\nparsing unsuccessful!\nparsed value: [1,2,3]\n
    "},{"location":"features/parsing/parser_callbacks/","title":"Parser Callbacks","text":""},{"location":"features/parsing/parser_callbacks/#overview","title":"Overview","text":"

    With a parser callback function, the result of parsing a JSON text can be influenced. When passed to parse, it is called on certain events (passed as parse_event_t via parameter event) with a set recursion depth depth and context JSON value parsed. The return value of the callback function is a boolean indicating whether the element that emitted the callback shall be kept or not.

    The type of the callback function is:

    template<typename BasicJsonType>\nusing parser_callback_t =\n    std::function<bool(int depth, parse_event_t event, BasicJsonType& parsed)>;\n
    "},{"location":"features/parsing/parser_callbacks/#callback-event-types","title":"Callback event types","text":"

    We distinguish six scenarios (determined by the event type) in which the callback function can be called. The following table describes the values of the parameters depth, event, and parsed.

    parameter event description parameter depth parameter parsed parse_event_t::object_start the parser read { and started to process a JSON object depth of the parent of the JSON object a JSON value with type discarded parse_event_t::key the parser read a key of a value in an object depth of the currently parsed JSON object a JSON string containing the key parse_event_t::object_end the parser read } and finished processing a JSON object depth of the parent of the JSON object the parsed JSON object parse_event_t::array_start the parser read [ and started to process a JSON array depth of the parent of the JSON array a JSON value with type discarded parse_event_t::array_end the parser read ] and finished processing a JSON array depth of the parent of the JSON array the parsed JSON array parse_event_t::value the parser finished reading a JSON value depth of the value the parsed JSON value Example

    When parsing the following JSON text,

    {\n    \"name\": \"Berlin\",\n    \"location\": [\n        52.519444,\n        13.406667\n    ]\n}\n

    these calls are made to the callback function:

    event depth parsed object_start 0 discarded key 1 \"name\" value 1 \"Berlin\" key 1 \"location\" array_start 1 discarded value 2 52.519444 value 2 13.406667 array_end 1 [52.519444,13.406667] object_end 0 {\"location\":[52.519444,13.406667],\"name\":\"Berlin\"}"},{"location":"features/parsing/parser_callbacks/#return-value","title":"Return value","text":"

    Discarding a value (i.e., returning false) has different effects depending on the context in which the function was called:

    • Discarded values in structured types are skipped. That is, the parser will behave as if the discarded value was never read.
    • In case a value outside a structured type is skipped, it is replaced with null. This case happens if the top-level element is skipped.
    Example

    The example below demonstrates the parse() function with and without callback function.

    #include <iostream>\n#include <iomanip>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // a JSON text\n    auto text = R\"(\n    {\n        \"Image\": {\n            \"Width\":  800,\n            \"Height\": 600,\n            \"Title\":  \"View from 15th Floor\",\n            \"Thumbnail\": {\n                \"Url\":    \"http://www.example.com/image/481989943\",\n                \"Height\": 125,\n                \"Width\":  100\n            },\n            \"Animated\" : false,\n            \"IDs\": [116, 943, 234, 38793]\n        }\n    }\n    )\";\n\n    // parse and serialize JSON\n    json j_complete = json::parse(text);\n    std::cout << std::setw(4) << j_complete << \"\\n\\n\";\n\n    // define parser callback\n    json::parser_callback_t cb = [](int depth, json::parse_event_t event, json & parsed)\n    {\n        // skip object elements with key \"Thumbnail\"\n        if (event == json::parse_event_t::key and parsed == json(\"Thumbnail\"))\n        {\n            return false;\n        }\n        else\n        {\n            return true;\n        }\n    };\n\n    // parse (with callback) and serialize JSON\n    json j_filtered = json::parse(text, cb);\n    std::cout << std::setw(4) << j_filtered << '\\n';\n}\n

    Output:

    {\n    \"Image\": {\n        \"Animated\": false,\n        \"Height\": 600,\n        \"IDs\": [\n            116,\n            943,\n            234,\n            38793\n        ],\n        \"Thumbnail\": {\n            \"Height\": 125,\n            \"Url\": \"http://www.example.com/image/481989943\",\n            \"Width\": 100\n        },\n        \"Title\": \"View from 15th Floor\",\n        \"Width\": 800\n    }\n}\n\n{\n    \"Image\": {\n        \"Animated\": false,\n        \"Height\": 600,\n        \"IDs\": [\n            116,\n            943,\n            234,\n            38793\n        ],\n        \"Title\": \"View from 15th Floor\",\n        \"Width\": 800\n    }\n}\n
    "},{"location":"features/parsing/sax_interface/","title":"SAX Interface","text":"

    The library uses a SAX-like interface with the following functions:

    classDiagram\n\nclass sax_t [\"json::sax_t\"] {\n    <<interface>>\n    +bool null()*\n\n    +bool boolean(bool val)*\n\n    +bool number_integer(number_integer_t val)*\n    +bool number_unsigned(number_unsigned_t val)*\n\n    +bool number_float(number_float_t val, const string_t& s)*\n\n    +bool string(string_t& val)*\n    +bool binary(binary_t& val)*\n\n    +bool start_object(std::size_t elements)*\n    +bool end_object()*\n    +bool start_array(std::size_t elements)*\n    +bool end_array()*\n    +bool key(string_t& val)*\n\n    +bool parse_error(std::size_t position, const std::string& last_token, const json::exception& ex)*\n}
    // called when null is parsed\nbool null();\n\n// called when a boolean is parsed; value is passed\nbool boolean(bool val);\n\n// called when a signed or unsigned integer number is parsed; value is passed\nbool number_integer(number_integer_t val);\nbool number_unsigned(number_unsigned_t val);\n\n// called when a floating-point number is parsed; value and original string is passed\nbool number_float(number_float_t val, const string_t& s);\n\n// called when a string is parsed; value is passed and can be safely moved away\nbool string(string_t& val);\n// called when a binary value is parsed; value is passed and can be safely moved away\nbool binary(binary_t& val);\n\n// called when an object or array begins or ends, resp. The number of elements is passed (or -1 if not known)\nbool start_object(std::size_t elements);\nbool end_object();\nbool start_array(std::size_t elements);\nbool end_array();\n// called when an object key is parsed; value is passed and can be safely moved away\nbool key(string_t& val);\n\n// called when a parse error occurs; byte position, the last token, and an exception is passed\nbool parse_error(std::size_t position, const std::string& last_token, const json::exception& ex);\n

    The return value of each function determines whether parsing should proceed.

    To implement your own SAX handler, proceed as follows:

    1. Implement the SAX interface in a class. You can use class nlohmann::json_sax<json> as base class, but you can also use any class where the functions described above are implemented and public.
    2. Create an object of your SAX interface class, e.g. my_sax.
    3. Call bool json::sax_parse(input, &my_sax); where the first parameter can be any input like a string or an input stream and the second parameter is a pointer to your SAX interface.

    Note the sax_parse function only returns a bool indicating the result of the last executed SAX event. It does not return json value - it is up to you to decide what to do with the SAX events. Furthermore, no exceptions are thrown in case of a parse error - it is up to you what to do with the exception object passed to your parse_error implementation. Internally, the SAX interface is used for the DOM parser (class json_sax_dom_parser) as well as the acceptor (json_sax_acceptor), see file json_sax.hpp.

    "},{"location":"features/parsing/sax_interface/#see-also","title":"See also","text":"
    • json_sax - documentation of the SAX interface
    • sax_parse - SAX parser
    "},{"location":"features/types/","title":"Types","text":"

    This page gives an overview of how JSON values are stored and how this can be configured.

    "},{"location":"features/types/#overview","title":"Overview","text":"

    By default, JSON values are stored as follows:

    JSON type C++ type object std::map<std::string, basic_json> array std::vector<basic_json> null std::nullptr_t string std::string boolean bool number std::int64_t, std::uint64_t, and double

    Note there are three different types for numbers - when parsing JSON text, the best fitting type is chosen.

    "},{"location":"features/types/#storage","title":"Storage","text":"
    classDiagram\n\nclass value_t {\n    <<enumeration>>\n    null\n    object\n    array\n    string\n    boolean\n    number_integer\n    number_unsigned\n    number_float\n    binary\n    discarded\n}\n\nclass json_value {\n    <<union>>\n    object_t* object\n    array_t* array\n    string_t* string\n    binary_t* binary\n    boolean_t boolean\n    number_integer_t number_integer\n    number_unsigned_t number_unsigned\n    number_float_t number_float\n}\n\nclass basic_json {\n    -value_t m_type\n    -json_value m_value\n    +typedef object_t\n    +typedef array_t\n    +typedef binary_t\n    +typedef boolean_t\n    +typedef number_integer_t\n    +typedef number_unsigned_t\n    +typedef number_float_t\n}\n\nbasic_json .. json_value\nbasic_json .. value_t
    "},{"location":"features/types/#template-arguments","title":"Template arguments","text":"

    The data types to store a JSON value are derived from the template arguments passed to class basic_json:

    template<\n    template<typename U, typename V, typename... Args> class ObjectType = std::map,\n    template<typename U, typename... Args> class ArrayType = std::vector,\n    class StringType = std::string,\n    class BooleanType = bool,\n    class NumberIntegerType = std::int64_t,\n    class NumberUnsignedType = std::uint64_t,\n    class NumberFloatType = double,\n    template<typename U> class AllocatorType = std::allocator,\n    template<typename T, typename SFINAE = void> class JSONSerializer = adl_serializer,\n    class BinaryType = std::vector<std::uint8_t>\n>\nclass basic_json;\n

    Type json is an alias for basic_json<> and uses the default types.

    From the template arguments, the following types are derived:

    using object_comparator_t = std::less<>;\nusing object_t = ObjectType<StringType, basic_json, object_comparator_t,\n                   AllocatorType<std::pair<const StringType, basic_json>>>;\n\nusing array_t = ArrayType<basic_json, AllocatorType<basic_json>>;\n\nusing string_t = StringType;\n\nusing boolean_t = BooleanType;\n\nusing number_integer_t = NumberIntegerType;\nusing number_unsigned_t = NumberUnsignedType;\nusing number_float_t = NumberFloatType;\n\nusing binary_t = nlohmann::byte_container_with_subtype<BinaryType>;\n
    "},{"location":"features/types/#objects","title":"Objects","text":"

    RFC 8259 describes JSON objects as follows:

    An object is an unordered collection of zero or more name/value pairs, where a name is a string and a value is a string, number, boolean, null, object, or array.

    "},{"location":"features/types/#default-type","title":"Default type","text":"

    With the default values for ObjectType (std::map), StringType (std::string), and AllocatorType (std::allocator), the default value for object_t is:

    std::map<\n  std::string, // key_type\n  basic_json, // value_type\n  std::less<>, // key_compare\n  std::allocator<std::pair<const std::string, basic_json>> // allocator_type\n>\n
    "},{"location":"features/types/#behavior","title":"Behavior","text":"

    The choice of object_t influences the behavior of the JSON class. With the default type, objects have the following behavior:

    • When all names are unique, objects will be interoperable in the sense that all software implementations receiving that object will agree on the name-value mappings.
    • When the names within an object are not unique, it is unspecified which one of the values for a given key will be chosen. For instance, {\"key\": 2, \"key\": 1} could be equal to either {\"key\": 1} or {\"key\": 2}.
    • Internally, name/value pairs are stored in lexicographical order of the names. Objects will also be serialized (see dump) in this order. For instance, both {\"b\": 1, \"a\": 2} and {\"a\": 2, \"b\": 1} will be stored and serialized as {\"a\": 2, \"b\": 1}.
    • When comparing objects, the order of the name/value pairs is irrelevant. This makes objects interoperable in the sense that they will not be affected by these differences. For instance, {\"b\": 1, \"a\": 2} and {\"a\": 2, \"b\": 1} will be treated as equal.
    "},{"location":"features/types/#key-order","title":"Key order","text":"

    The order name/value pairs are added to the object are not preserved by the library. Therefore, iterating an object may return name/value pairs in a different order than they were originally stored. In fact, keys will be traversed in alphabetical order as std::map with std::less is used by default. Please note this behavior conforms to RFC 8259, because any order implements the specified \"unordered\" nature of JSON objects.

    "},{"location":"features/types/#limits","title":"Limits","text":"

    RFC 8259 specifies:

    An implementation may set limits on the maximum depth of nesting.

    In this class, the object's limit of nesting is not explicitly constrained. However, a maximum depth of nesting may be introduced by the compiler or runtime environment. A theoretical limit can be queried by calling the max_size function of a JSON object.

    "},{"location":"features/types/#storage_1","title":"Storage","text":"

    Objects are stored as pointers in a basic_json type. That is, for any access to object values, a pointer of type object_t* must be dereferenced.

    "},{"location":"features/types/#arrays","title":"Arrays","text":"

    RFC 8259 describes JSON arrays as follows:

    An array is an ordered sequence of zero or more values.

    "},{"location":"features/types/#default-type_1","title":"Default type","text":"

    With the default values for ArrayType (std::vector) and AllocatorType (std::allocator), the default value for array_t is:

    std::vector<\n  basic_json, // value_type\n  std::allocator<basic_json> // allocator_type\n>\n
    "},{"location":"features/types/#limits_1","title":"Limits","text":"

    RFC 8259 specifies:

    An implementation may set limits on the maximum depth of nesting.

    In this class, the array's limit of nesting is not explicitly constrained. However, a maximum depth of nesting may be introduced by the compiler or runtime environment. A theoretical limit can be queried by calling the max_size function of a JSON array.

    "},{"location":"features/types/#storage_2","title":"Storage","text":"

    Arrays are stored as pointers in a basic_json type. That is, for any access to array values, a pointer of type array_t* must be dereferenced.

    "},{"location":"features/types/#strings","title":"Strings","text":"

    RFC 8259 describes JSON strings as follows:

    A string is a sequence of zero or more Unicode characters.

    Unicode values are split by the JSON class into byte-sized characters during deserialization.

    "},{"location":"features/types/#default-type_2","title":"Default type","text":"

    With the default values for StringType (std::string), the default value for string_t is std::string.

    "},{"location":"features/types/#encoding","title":"Encoding","text":"

    Strings are stored in UTF-8 encoding. Therefore, functions like std::string::size() or std::string::length() return the number of bytes in the string rather than the number of characters or glyphs.

    "},{"location":"features/types/#string-comparison","title":"String comparison","text":"

    RFC 8259 states:

    Software implementations are typically required to test names of object members for equality. Implementations that transform the textual representation into sequences of Unicode code units and then perform the comparison numerically, code unit by code unit are interoperable in the sense that implementations will agree in all cases on equality or inequality of two strings. For example, implementations that compare strings with escaped characters unconverted may incorrectly find that \"a\\\\b\" and \"a\\u005Cb\" are not equal.

    This implementation is interoperable as it does compare strings code unit by code unit.

    "},{"location":"features/types/#storage_3","title":"Storage","text":"

    String values are stored as pointers in a basic_json type. That is, for any access to string values, a pointer of type string_t* must be dereferenced.

    "},{"location":"features/types/#booleans","title":"Booleans","text":"

    RFC 8259 implicitly describes a boolean as a type which differentiates the two literals true and false.

    "},{"location":"features/types/#default-type_3","title":"Default type","text":"

    With the default values for BooleanType (bool), the default value for boolean_t is bool.

    "},{"location":"features/types/#storage_4","title":"Storage","text":"

    Boolean values are stored directly inside a basic_json type.

    "},{"location":"features/types/#numbers","title":"Numbers","text":"

    See the number handling article for a detailed discussion on how numbers are handled by this library.

    RFC 8259 describes numbers as follows:

    The representation of numbers is similar to that used in most programming languages. A number is represented in base 10 using decimal digits. It contains an integer component that may be prefixed with an optional minus sign, which may be followed by a fraction part and/or an exponent part. Leading zeros are not allowed. (...) Numeric values that cannot be represented in the grammar below (such as Infinity and NaN) are not permitted.

    This description includes both integer and floating-point numbers. However, C++ allows more precise storage if it is known whether the number is a signed integer, an unsigned integer, or a floating-point number. Therefore, three different types, number_integer_t, number_unsigned_t, and number_float_t are used.

    "},{"location":"features/types/#default-types","title":"Default types","text":"

    With the default values for NumberIntegerType (std::int64_t), the default value for number_integer_t is std::int64_t. With the default values for NumberUnsignedType (std::uint64_t), the default value for number_unsigned_t is std::uint64_t. With the default values for NumberFloatType (double), the default value for number_float_t is double.

    "},{"location":"features/types/#default-behavior","title":"Default behavior","text":"
    • The restrictions about leading zeros are not enforced in C++. Instead, leading zeros in integer literals lead to an interpretation as an octal number. Internally, the value will be stored as a decimal number. For instance, the C++ integer literal 010 will be serialized to 8. During deserialization, leading zeros yield an error.
    • Not-a-number (NaN) values will be serialized to null.
    "},{"location":"features/types/#limits_2","title":"Limits","text":"

    RFC 8259 specifies:

    An implementation may set limits on the range and precision of numbers.

    When the default type is used, the maximal integer number that can be stored is 9223372036854775807 (INT64_MAX) and the minimal integer number that can be stored is -9223372036854775808 (INT64_MIN). Integer numbers that are out of range will yield over/underflow when used in a constructor. During deserialization, too large or small integer numbers will automatically be stored as number_unsigned_t or number_float_t.

    When the default type is used, the maximal unsigned integer number that can be stored is 18446744073709551615 (UINT64_MAX) and the minimal integer number that can be stored is 0. Integer numbers that are out of range will yield over/underflow when used in a constructor. During deserialization, too large or small integer numbers will automatically be stored as number_integer_t or number_float_t.

    RFC 8259 further states:

    Note that when such software is used, numbers that are integers and are in the range [-2^{53}+1, 2^{53}-1] are interoperable in the sense that implementations will agree exactly on their numeric values.

    As this range is a subrange of the exactly supported range [INT64_MIN, INT64_MAX], this class's integer type is interoperable.

    RFC 8259 states:

    This specification allows implementations to set limits on the range and precision of numbers accepted. Since software that implements IEEE 754-2008 binary64 (double precision) numbers is generally available and widely used, good interoperability can be achieved by implementations that expect no more precision or range than these provide, in the sense that implementations will approximate JSON numbers within the expected precision.

    This implementation does exactly follow this approach, as it uses double precision floating-point numbers. Note values smaller than -1.79769313486232e+308 and values greater than 1.79769313486232e+308 will be stored as NaN internally and be serialized to null.

    "},{"location":"features/types/#storage_5","title":"Storage","text":"

    Integer number values, unsigned integer number values, and floating-point number values are stored directly inside a basic_json type.

    "},{"location":"features/types/number_handling/","title":"Number Handling","text":"

    This document describes how the library is handling numbers.

    "},{"location":"features/types/number_handling/#background","title":"Background","text":"

    This section briefly summarizes how the JSON specification describes how numbers should be handled.

    "},{"location":"features/types/number_handling/#json-number-syntax","title":"JSON number syntax","text":"

    JSON defines the syntax of numbers as follows:

    RFC 8259, Section 6

    The representation of numbers is similar to that used in most programming languages. A number is represented in base 10 using decimal digits. It contains an integer component that may be prefixed with an optional minus sign, which may be followed by a fraction part and/or an exponent part. Leading zeros are not allowed.

    A fraction part is a decimal point followed by one or more digits.

    An exponent part begins with the letter E in uppercase or lowercase, which may be followed by a plus or minus sign. The E and optional sign are followed by one or more digits.

    The following railroad diagram from json.org visualizes the number syntax:

    "},{"location":"features/types/number_handling/#number-interoperability","title":"Number interoperability","text":"

    On number interoperability, the following remarks are made:

    RFC 8259, Section 6

    This specification allows implementations to set limits on the range and precision of numbers accepted. Since software that implements IEEE 754 binary64 (double precision) numbers [IEEE754] is generally available and widely used, good interoperability can be achieved by implementations that expect no more precision or range than these provide, in the sense that implementations will approximate JSON numbers within the expected precision. A JSON number such as 1E400 or 3.141592653589793238462643383279 may indicate potential interoperability problems, since it suggests that the software that created it expects receiving software to have greater capabilities for numeric magnitude and precision than is widely available.

    Note that when such software is used, numbers that are integers and are in the range [-2^{53}+1, 2^{53}-1] are interoperable in the sense that implementations will agree exactly on their numeric values.

    "},{"location":"features/types/number_handling/#library-implementation","title":"Library implementation","text":"

    This section describes how this library implements the above number specification.

    "},{"location":"features/types/number_handling/#number-storage","title":"Number storage","text":"

    In the default json type, numbers are stored as std::uint64_t, std::int64_t, and double, respectively. Thereby, std::uint64_t and std::int64_t are used only if they can store the number without loss of precision. If this is impossible (e.g., if the number is too large), the number is stored as double.

    Notes

    • Numbers with a decimal digit or scientific notation are always stored as double.
    • The number types can be changed, see Template number types.
    • As of version 3.9.1, the conversion is realized by std::strtoull, std::strtoll, and std::strtod, respectively.

    Examples

    • Integer -12345678912345789123456789 is smaller than INT64_MIN and will be stored as floating-point number -1.2345678912345788e+25.
    • Integer 1E3 will be stored as floating-point number 1000.0.
    "},{"location":"features/types/number_handling/#number-limits","title":"Number limits","text":"
    • Any 64-bit signed or unsigned integer can be stored without loss of precision.
    • Numbers exceeding the limits of double (i.e., numbers that after conversion via std::strtod are not satisfying std::isfinite such as 1E400) will throw exception json.exception.out_of_range.406 during parsing.
    • Floating-point numbers are rounded to the next number representable as double. For instance 3.141592653589793238462643383279 is stored as 0x400921fb54442d18. This is the same behavior as the code double x = 3.141592653589793238462643383279;.

    Interoperability

    • The library interoperable with respect to the specification, because its supported range [-2^{63}, 2^{64}-1] is larger than the described range [-2^{53}+1, 2^{53}-1].
    • All integers outside the range [-2^{63}, 2^{64}-1], as well as floating-point numbers are stored as double. This also concurs with the specification above.
    "},{"location":"features/types/number_handling/#zeros","title":"Zeros","text":"

    The JSON number grammar allows for different ways to express zero, and this library will store zeros differently:

    Literal Stored value and type Serialization 0 std::uint64_t(0) 0 -0 std::int64_t(0) 0 0.0 double(0.0) 0.0 -0.0 double(-0.0) -0.0 0E0 double(0.0) 0.0 -0E0 double(-0.0) -0.0

    That is, -0 is stored as a signed integer, but the serialization does not reproduce the -.

    "},{"location":"features/types/number_handling/#number-serialization","title":"Number serialization","text":"
    • Integer numbers are serialized as is; that is, no scientific notation is used.
    • Floating-point numbers are serialized as specified by the %g printf modifier with std::numeric_limits<double>::max_digits10 significant digits. The rationale is to use the shortest representation while still allowing round-tripping.

    Notes regarding precision of floating-point numbers

    As described above, floating-point numbers are rounded to the nearest double and serialized with the shortest representation to allow round-tripping. This can yield confusing examples:

    • The serialization can have fewer decimal places than the input: 2555.5599999999999 will be serialized as 2555.56. The reverse can also be true.
    • The serialization can be in scientific notation even if the input is not: 0.0000972439793401814 will be serialized as 9.72439793401814e-05. The reverse can also be true: 12345E-5 will be serialized as 0.12345.
    • Conversions from float to double can also introduce rounding errors: 
      float f = 0.3;\njson j = f;\nstd::cout << j << '\\n';\n
      yields 0.30000001192092896.

    All examples here can be reproduced by passing the original double value to

    std::printf(\"%.*g\\n\", std::numeric_limits<double>::max_digits10, double_value);\n
    "},{"location":"features/types/number_handling/#nan-handling","title":"NaN handling","text":"

    NaN (not-a-number) cannot be expressed with the number syntax described above and are in fact explicitly excluded:

    RFC 8259, Section 6

    Numeric values that cannot be represented in the grammar below (such as Infinity and NaN) are not permitted.

    That is, there is no way to parse a NaN value. However, assignments can store NaN values in a JSON value.

    This library serializes NaN values as null. This corresponds to the behavior of JavaScript's JSON.stringify function.

    Example

    The following example shows how a NaN value is stored in a json value.

    int main()\n{\n    double val = std::numeric_limits<double>::quiet_NaN();\n    std::cout << \"val=\" << val << std::endl;\n    json j = val;\n    std::cout << \"j=\" << j.dump() << std::endl;\n    val = j;\n    std::cout << \"val=\" << val << std::endl;\n}\n

    output:

    val=nan\nj=null\nval=nan\n
    "},{"location":"features/types/number_handling/#number-comparison","title":"Number comparison","text":"

    Floating-point inside JSON values numbers are compared with json::number_float_t::operator== which is double::operator== by default.

    Alternative comparison functions

    To compare floating-point while respecting an epsilon, an alternative comparison function could be used, for instance

    template<typename T, typename = typename std::enable_if<std::is_floating_point<T>::value, T>::type>\ninline bool is_same(T a, T b, T epsilon = std::numeric_limits<T>::epsilon()) noexcept\n{\n    return std::abs(a - b) <= epsilon;\n}\n
    Or you can self-define an operator equal function like this:

    bool my_equal(const_reference lhs, const_reference rhs)\n{\n    const auto lhs_type lhs.type();\n    const auto rhs_type rhs.type();\n    if (lhs_type == rhs_type)\n    {\n        switch(lhs_type)\n        {\n            // self_defined case\n            case value_t::number_float:\n                return std::abs(lhs - rhs) <= std::numeric_limits<float>::epsilon();\n\n            // other cases remain the same with the original\n            ...\n        }\n    }\n    ...\n}\n

    (see #703 for more information.)

    Note

    NaN values never compare equal to themselves or to other NaN values. See #514.

    "},{"location":"features/types/number_handling/#number-conversion","title":"Number conversion","text":"

    Just like the C++ language itself, the get family of functions allows conversions between unsigned and signed integers, and between integers and floating-point values to integers. This behavior may be surprising.

    Unconditional number conversions

    double d = 42.3;                                   // non-integer double value 42.3\njson jd = d;                                       // stores double value 42.3\nstd::int64_t i = jd.template get<std::int64_t>();  // now i==42; no warning or error is produced\n

    Note the last line with throw a json.exception.type_error.302 exception if jd is not a numerical type, for instance a string.

    The rationale is twofold:

    1. JSON does not define a number type or precision (see above).
    2. C++ also allows silently converting between number types.

    Conditional number conversion

    The code above can be solved by explicitly checking the nature of the value with members such as is_number_integer() or is_number_unsigned():

    // check if jd is really integer-valued\nif (jd.is_number_integer())\n{\n    // if so, do the conversion and use i\n    std::int64_t i = jd.template get<std::int64_t>();\n    // ...\n}\nelse\n{\n    // otherwise, take appropriate action\n    // ...\n}\n

    Note this approach also has the advantage that it can react on non-numerical JSON value types such as strings.

    (Example taken from #777.)

    "},{"location":"features/types/number_handling/#determine-number-types","title":"Determine number types","text":"

    As the example in Number conversion shows, there are different functions to determine the type of the stored number:

    • is_number() returns true for any number type
    • is_number_integer() returns true for signed and unsigned integers
    • is_number_unsigned() returns true for unsigned integers only
    • is_number_float() returns true for floating-point numbers
    • type_name() returns \"number\" for any number type
    • type() returns a different enumerator of value_t for all number types
    function unsigned integer signed integer floating-point string is_number() true true true false is_number_integer() true true false false is_number_unsigned() true false false false is_number_float() false false true false type_name() \"number\" \"number\" \"number\" \"string\" type() number_unsigned number_integer number_float string"},{"location":"features/types/number_handling/#template-number-types","title":"Template number types","text":"

    The number types can be changed with template parameters.

    position number type default type possible values 5 signed integers std::int64_t std::int32_t, std::int16_t, etc. 6 unsigned integers std::uint64_t std::uint32_t, std::uint16_t, etc. 7 floating-point double float, long double

    Constraints on number types

    • The type for signed integers must be convertible from long long. The type for floating-point numbers is used in case of overflow.
    • The type for unsigned integers must be convertible from unsigned long long. The type for floating-point numbers is used in case of overflow.
    • The types for signed and unsigned integers must be distinct, see #2573.
    • Only double, float, and long double are supported for floating-point numbers.

    Example

    A basic_json type that uses long double as floating-point type.

    using json_ld = nlohmann::basic_json<std::map, std::vector, std::string, bool,\n                                     std::int64_t, std::uint64_t, long double>;\n

    Note values should then be parsed with json_ld::parse rather than json::parse as the latter would parse floating-point values to double before then converting them to long double.

    "},{"location":"home/architecture/","title":"Architecture","text":"

    Info

    This page is still under construction. Its goal is to provide a high-level overview of the library's architecture. This should help new contributors to get an idea of the used concepts and where to make changes.

    "},{"location":"home/architecture/#overview","title":"Overview","text":"

    The main structure is class nlohmann::basic_json.

    • public API
    • container interface
    • iterators
    "},{"location":"home/architecture/#template-specializations","title":"Template specializations","text":"
    • describe template parameters of basic_json
    • json
    • ordered_json via ordered_map
    "},{"location":"home/architecture/#value-storage","title":"Value storage","text":"

    Values are stored as a tagged union of value_t and json_value.

    /// the type of the current element\nvalue_t m_type = value_t::null;\n\n/// the value of the current element\njson_value m_value = {};\n

    with

    enum class value_t : std::uint8_t\n{\n    null,             ///< null value\n    object,           ///< object (unordered set of name/value pairs)\n    array,            ///< array (ordered collection of values)\n    string,           ///< string value\n    boolean,          ///< boolean value\n    number_integer,   ///< number value (signed integer)\n    number_unsigned,  ///< number value (unsigned integer)\n    number_float,     ///< number value (floating-point)\n    binary,           ///< binary array (ordered collection of bytes)\n    discarded         ///< discarded by the parser callback function\n};\n\nunion json_value {\n  /// object (stored with pointer to save storage)\n  object_t *object;\n  /// array (stored with pointer to save storage)\n  array_t *array;\n  /// string (stored with pointer to save storage)\n  string_t *string;\n  /// binary (stored with pointer to save storage)\n  binary_t *binary;\n  /// boolean\n  boolean_t boolean;\n  /// number (integer)\n  number_integer_t number_integer;\n  /// number (unsigned integer)\n  number_unsigned_t number_unsigned;\n  /// number (floating-point)\n  number_float_t number_float;\n};\n
    "},{"location":"home/architecture/#parsing-inputs-deserialization","title":"Parsing inputs (deserialization)","text":"

    Input is read via input adapters that abstract a source with a common interface:

    /// read a single character\nstd::char_traits<char>::int_type get_character() noexcept;\n\n/// read multiple characters to a destination buffer and\n/// returns the number of characters successfully read\ntemplate<class T>\nstd::size_t get_elements(T* dest, std::size_t count = 1);\n

    List examples of input adapters.

    "},{"location":"home/architecture/#sax-interface","title":"SAX Interface","text":"

    TODO

    "},{"location":"home/architecture/#writing-outputs-serialization","title":"Writing outputs (serialization)","text":"

    Output is written via output adapters:

    template<typename T>\nvoid write_character(CharType c);\n\ntemplate<typename CharType>\nvoid write_characters(const CharType* s, std::size_t length);\n

    List examples of output adapters.

    "},{"location":"home/architecture/#value-conversion","title":"Value conversion","text":"
    template<class T>\nvoid to_json(basic_json& j, const T& t);\n\ntemplate<class T>\nvoid from_json(const basic_json& j, T& t);\n
    "},{"location":"home/architecture/#additional-features","title":"Additional features","text":"
    • JSON Pointers
    • Binary formats
    • Custom base class
    • Conversion macros
    "},{"location":"home/architecture/#details-namespace","title":"Details namespace","text":"
    • C++ feature backports
    "},{"location":"home/customers/","title":"Customers","text":"

    The library is used in multiple projects, applications, operating systems, etc. The list below is not exhaustive, but the result of an internet search. If you know further customers of the library, please let me know.

    "},{"location":"home/customers/#space-exploration","title":"Space Exploration","text":"
    • Peregrine Lunar Lander Flight 01 - The library was used for payload management in the Peregrine Moon Lander, developed by Astrobotic Technology and launched as part of NASA's Commercial Lunar Payload Services (CLPS) program. After six days in orbit, the spacecraft was intentionally redirected into Earth's atmosphere, where it burned up over the Pacific Ocean on January 18, 2024.
    "},{"location":"home/customers/#automotive","title":"Automotive","text":"
    • Alexa Auto SDK, a software development kit enabling the integration of Alexa into automotive systems
    • Apollo, a framework for building autonomous driving systems
    • Automotive Grade Linux (AGL), a collaborative open-source platform for automotive software development
    • Genesis Motor (infotainment), a luxury automotive brand
    • Hyundai (infotainment), a global automotive brand
    • Kia (infotainment), a global automotive brand
    • Mercedes-Benz Operating System (MB.OS), a core component of the vehicle software ecosystem from Mercedes-Benz
    • Rivian (infotainment), an electric vehicle manufacturer
    • Suzuki (infotainment), a global automotive and motorcycle manufacturer
    "},{"location":"home/customers/#gaming-and-entertainment","title":"Gaming and Entertainment","text":"
    • Assassin's Creed: Mirage, a stealth-action game set in the Middle East, focusing on the journey of a young assassin with classic parkour and stealth mechanics
    • Chasm: The Rift, a first-person shooter blending horror and adventure, where players navigate dark realms and battle monsters
    • College Football 25, a college football simulation game featuring gameplay that mimics real-life college teams and competitions
    • Concepts, a digital sketching app designed for creative professionals, offering flexible drawing tools for illustration, design, and brainstorming
    • Depthkit, a tool for creating and capturing volumetric video, enabling immersive 3D experiences and interactive content
    • IMG.LY, a platform offering creative tools and SDKs for integrating advanced image and video editing in applications
    • LOOT, a tool for optimizing the load order of game plugins, commonly used in The Elder Scrolls and Fallout series
    • Madden NFL 25, a sports simulation game capturing the excitement of American football with realistic gameplay and team management features
    • Marne, an unofficial private server platform for hosting custom Battlefield 1 game experiences
    • Minecraft, a popular sandbox video game
    • NHL 22, a hockey simulation game offering realistic gameplay, team management, and various modes to enhance the hockey experience
    • Pixelpart, a 2D animation and video compositing software that allows users to create animated graphics and visual effects with a focus on simplicity and ease of use
    • Razer Cortex, a gaming performance optimizer and system booster designed to enhance the gaming experience
    • Red Dead Redemption II, an open-world action-adventure game following an outlaw's story in the late 1800s, emphasizing deep storytelling and immersive gameplay
    • Snapchat, a multimedia messaging and augmented reality app for communication and entertainment
    • Tactics Ogre: Reborn, a tactical role-playing game featuring strategic battles and deep storytelling elements
    • Throne and Liberty, an MMORPG that offers an expansive fantasy world with dynamic gameplay and immersive storytelling
    • Unity Vivox, a communication service that enables voice and text chat functionality in multiplayer games developed with Unity
    • Zool: Redimensioned, a modern reimagining of the classic platformer featuring fast-paced gameplay and vibrant environments
    • immersivetech, a technology company focused on immersive experiences, providing tools and solutions for virtual and augmented reality applications
    "},{"location":"home/customers/#consumer-electronics","title":"Consumer Electronics","text":"
    • Audinate, a provider of networked audio solutions specializing in Dante technology, which facilitates high-quality digital audio transport over IP networks
    • Canon CanoScan LIDE, a series of flatbed scanners offering high-resolution image scanning for home and office use
    • Canon PIXMA Printers, a line of all-in-one inkjet printers known for high-quality printing and wireless connectivity
    • Cisco Webex Desk Camera, a video camera designed for professional-quality video conferencing and remote collaboration
    • Philips Hue Personal Wireless Lighting, a smart lighting system for customizable and wireless home illumination
    • Ray-Ban Meta Smart glasses, a pair of smart glasses designed for capturing photos and videos with integrated connectivity and social features
    • Razer Synapse, a unified configuration software enabling hardware customization for Razer devices
    • Siemens SINEMA Remote Connect, a remote connectivity solution for monitoring and managing industrial networks and devices securely
    • Sony PlayStation 4, a gaming console developed by Sony that offers a wide range of games and multimedia entertainment features
    • Sony Virtual Webcam Driver for Remote Camera, a software driver that enables the use of Sony cameras as virtual webcams for video conferencing and streaming
    "},{"location":"home/customers/#operating-systems","title":"Operating Systems","text":"
    • Apple iOS and macOS, a family of operating systems developed by Apple, including iOS for mobile devices and macOS for desktop computers
    • Google Fuchsia, an open-source operating system developed by Google, designed to be secure, updatable, and adaptable across various devices
    • SerenityOS, an open-source operating system that aims to provide a simple and beautiful user experience with a focus on simplicity and elegance
    • Yocto, a Linux-based build system for creating custom operating systems and software distributions, tailored for embedded devices and IoT applications
    "},{"location":"home/customers/#development-tools-and-ides","title":"Development Tools and IDEs","text":"
    • Accentize SpectralBalance, an adaptive speech analysis tool designed to enhance audio quality by optimizing frequency balance in recordings
    • Arm Compiler for Linux, a software development toolchain for compiling and optimizing applications on Arm-based Linux systems
    • BBEdit, a professional text and code editor for macOS
    • CoderPad, a collaborative coding platform that enables real-time code interviews and assessments for developers; the library is included in every CoderPad instance and can be accessed with a simple #include \"json.hpp\"
    • Compiler Explorer, a web-based tool that allows users to write, compile, and visualize the assembly output of code in various programming languages; the library is readily available and accessible with the directive #include <nlohmann/json.hpp>.
    • GitHub CodeQL, a code analysis tool used for identifying security vulnerabilities and bugs in software through semantic queries
    • Hex-Rays, a reverse engineering toolset for analyzing and decompiling binaries, primarily used for security research and vulnerability analysis
    • ImHex, a hex editor designed for reverse engineering, providing advanced features for data analysis and manipulation
    • Intel GPA Framework, a suite of cross-platform tools for capturing, analyzing, and optimizing graphics applications across different APIs
    • Intopix, a provider of advanced image processing and compression solutions used in software development and AV workflows
    • MKVToolNix, a set of tools for creating, editing, and inspecting MKV (Matroska) multimedia container files
    • Meta Yoga, a layout engine that facilitates flexible and efficient user interface design across multiple platforms
    • NVIDIA Nsight Compute, a performance analysis tool for CUDA applications that provides detailed insights into GPU performance metrics
    • Notepad++, a free source code editor that supports various programming languages
    • OpenRGB, an open source RGB lighting control that doesn't depend on manufacturer software
    • OpenTelemetry C++, a library for collecting and exporting observability data in C++, enabling developers to implement distributed tracing and metrics in their application
    • Qt Creator, an IDE for developing applications using the Qt application framework
    • Scanbot SDK, a software development kit (SDK) that provides tools for integrating advanced document scanning and barcode scanning capabilities into applications
    "},{"location":"home/customers/#machine-learning-and-ai","title":"Machine Learning and AI","text":"
    • Apple Core ML Tools, a set of tools for converting and configuring machine learning models for deployment in Apple's Core ML framework
    • Avular Mobile Robotics, a platform for developing and deploying mobile robotics solutions
    • Google gemma.cpp, a lightweight C++ inference engine designed for running AI models from the Gemma family
    • llama.cpp, a C++ library designed for efficient inference of large language models (LLMs), enabling streamlined integration into applications
    • MLX, an array framework for machine learning on Apple Silicon
    • Mozilla llamafile, a tool designed for distributing and executing large language models (LLMs) efficiently using a single file format
    • NVIDIA ACE, a suite of real-time AI solutions designed for the development of interactive avatars and digital human applications, enabling scalable and sophisticated user interactions
    • Peer, a platform offering personalized AI assistants for interactive learning and creative collaboration
    • stable-diffusion.cpp, a C++ implementation of the Stable Diffusion image generation model
    • TanvasTouch, a software development kit (SDK) that enables developers to create tactile experiences on touchscreens, allowing users to feel textures and physical sensations in a digital environment
    • TensorFlow, a machine learning framework that facilitates the development and training of models, supporting data serialization and efficient data exchange between components
    "},{"location":"home/customers/#scientific-research-and-analysis","title":"Scientific Research and Analysis","text":"
    • BLACK, a bounded linear temporal logic (LTL) satisfiability checker
    • CERN Atlas Athena, a software framework used in the ATLAS experiment at the Large Hadron Collider (LHC) for performance monitoring
    • ICU, the International Components for Unicode, a mature library for software globalization and multilingual support
    • KAMERA, a platform for synchronized data collection and real-time deep learning to map marine species like polar bears and seals, aiding Arctic ecosystem research
    • KiCad, a free and open-source software suite for electronic design automation
    • Maple, a symbolic and numeric computing environment for advanced mathematical modeling and analysis
    • MeVisLab, a software framework for medical image processing and visualization.
    • OpenPMD API, a versatile programming interface for accessing and managing scientific data, designed to facilitate the efficient storage, retrieval, and sharing of simulation data across various applications and platforms
    • ParaView, an open-source tool for large-scale data visualization and analysis across various scientific domains
    • QGIS, a free and open-source geographic information system (GIS) application that allows users to create, edit, visualize, and analyze geospatial data across a variety of formats
    • VTK, a software library for 3D computer graphics, image processing, and visualization
    • VolView, a lightweight application for interactive visualization and analysis of 3D medical imaging data.
    "},{"location":"home/customers/#business-and-productivity-software","title":"Business and Productivity Software","text":"
    • ArcGIS PRO, a desktop geographic information system (GIS) application developed by Esri for mapping and spatial analysis
    • Autodesk Desktop, a software platform developed by Autodesk for creating and managing desktop applications and services
    • Check Point, a cybersecurity company specializing in threat prevention and network security solutions, offering a range of products designed to protect enterprises from cyber threats and ensure data integrity
    • Microsoft Office for Mac, a suite of productivity applications developed by Microsoft for macOS, including tools for word processing, spreadsheets, and presentations
    • Microsoft Teams, a team collaboration application offering workspace chat and video conferencing, file storage, and integration of proprietary and third-party applications and services
    • Nexthink Infinity, a digital employee experience management platform for monitoring and improving IT performance
    • Sophos Connect Client, a secure VPN client from Sophos that allows remote users to connect to their corporate network, ensuring secure access to resources and data
    • Stonebranch, a cloud-based cybersecurity solution that integrates backup, disaster recovery, and cybersecurity features to protect data and ensure business continuity for organizations
    • Tablecruncher, a data analysis tool that allows users to import, analyze, and visualize spreadsheet data, offering interactive features for better insights and decision-making
    • magicplan, a mobile application for creating floor plans and interior designs using augmented reality
    "},{"location":"home/customers/#databases-and-big-data","title":"Databases and Big Data","text":"
    • ADIOS2, a data management framework designed for high-performance input and output operations
    • Cribl Stream, a real-time data processing platform that enables organizations to collect, route, and transform observability data, enhancing visibility and insights into their systems
    • DB Browser for SQLite, a visual open-source tool for creating, designing, and editing SQLite database files
    • MySQL Connector/C++, a C++ library for connecting and interacting with MySQL databases
    • MySQL NDB Cluster, a distributed database system that provides high availability and scalability for MySQL databases
    • MySQL Shell, an advanced client and code editor for interacting with MySQL servers, supporting SQL, Python, and JavaScript
    • PrestoDB, a distributed SQL query engine designed for large-scale data analytics, originally developed by Facebook
    • ROOT Data Analysis Framework, an open-source data analysis framework widely used in high-energy physics and other fields for data processing and visualization
    • WiredTiger, a high-performance storage engine for databases, offering support for compression, concurrency, and checkpointing
    "},{"location":"home/customers/#simulation-and-modeling","title":"Simulation and Modeling","text":"
    • Arcturus HoloSuite, a software toolset for capturing, editing, and streaming volumetric video, featuring advanced compression technologies for high-quality 3D content creation
    • azul, a fast and efficient 3D city model viewer designed for visualizing urban environments and spatial data
    • Blender, a free and open-source 3D creation suite for modeling, animation, rendering, and more
    • cpplot, a library for creating interactive graphs and charts in C++, which can be viewed in web browsers
    • Foundry Nuke, a powerful node-based digital compositing and visual effects application used in film and television post-production
    • GAMS, a high-performance mathematical modeling system for optimization and decision support
    • Kitware SMTK, a software toolkit for managing simulation models and workflows in scientific and engineering applications
    • M-Star, a computational fluid dynamics software for simulating and analyzing fluid flow
    • MapleSim CAD Toolbox, a software extension for MapleSim that integrates CAD models, allowing users to import, manipulate, and analyze 3D CAD data within the MapleSim environment for enhanced modeling and simulation
    • NVIDIA Omniverse, a platform for 3D content creation and collaboration that enables real-time simulations and interactive experiences across various industries
    • Pixar Renderman, a photorealistic 3D rendering software developed by Pixar, widely used in the film industry for creating high-quality visual effects and animations
    • ROS - Robot Operating System, a set of software libraries and tools that assist in developing robot applications
    • UBS, a multinational financial services and banking company
    "},{"location":"home/customers/#enterprise-and-cloud-applications","title":"Enterprise and Cloud Applications","text":"
    • Acronis Cyber Protect Cloud, an all-in-one data protection solution that combines backup, disaster recovery, and cybersecurity to safeguard business data from threats like ransomware
    • Baereos, a backup solution that provides data protection and recovery options for various environments, including physical and virtual systems
    • Bitdefender Home Scanner, a tool from Bitdefender that scans devices for malware and security threats, providing a safeguard against potential online dangers
    • Citrix Provisioning, a solution that streamlines the delivery of virtual desktops and applications by allowing administrators to manage and provision resources efficiently across multiple environments
    • Citrix Virtual Apps and Desktops, a solution from Citrix that delivers virtual apps and desktops
    • Cyberarc, a security solution that specializes in privileged access management, enabling organizations to control and monitor access to critical systems and data, thereby enhancing overall cybersecurity posture
    • Egnyte Desktop, a secure cloud storage solution designed for businesses, enabling file sharing, collaboration, and data management across teams while ensuring compliance and data protection
    • Elster, a digital platform developed by German tax authorities for secure and efficient electronic tax filing and management using secunet protect4use
    • Ethereum Solidity, a high-level, object-oriented programming language designed for implementing smart contracts on the Ethereum platform
    • Inciga, a monitoring tool for IT infrastructure, designed to provide insights into system performance and availability through customizable dashboards and alerts
    • Intel Accelerator Management Daemon for VMware ESXi, a management tool designed for monitoring and controlling Intel hardware accelerators within VMware ESXi environments, optimizing performance and resource allocation
    • Juniper Identity Management Service
    • Microsoft Azure IoT SDK, a collection of tools and libraries to help developers connect, build, and deploy Internet of Things (IoT) solutions on the Azure cloud platform
    • Microsoft WinGet, a command-line utility included in the Windows Package Manager
    • plexusAV, a high-performance AV-over-IP transceiver device capable of video encoding and decoding using the IPMX standard
    • Pointr, a platform for indoor positioning and navigation solutions, offering tools and SDKs for developers to create location-based applications
    • secunet protect4use, a secure, passwordless multifactor authentication solution that transforms smartphones into digital keyrings, ensuring high security for online services and digital identities
    • Sencore MRD 7000, a professional multi-channel receiver and decoder supporting UHD and HD stream decoding
    "},{"location":"home/design_goals/","title":"Design goals","text":"

    There are myriads of JSON libraries out there, and each may even have its reason to exist. Our class had these design goals:

    • Intuitive syntax. In languages such as Python, JSON feels like a first-class data type. We used all the operator magic of modern C++ to achieve the same feeling in your code.

    • Trivial integration. Our whole code consists of a single header file json.hpp. That's it. No library, no subproject, no dependencies, no complex build system. The class is written in vanilla C++11. All in all, everything should require no adjustment of your compiler flags or project settings.

    • Serious testing. Our class is heavily unit-tested and covers 100% of the code, including all exceptional behavior. Furthermore, we checked with Valgrind and the Clang Sanitizers that there are no memory leaks. Google OSS-Fuzz additionally runs fuzz tests against all parsers 24/7, effectively executing billions of tests so far. To maintain high quality, the project is following the Core Infrastructure Initiative (CII) best practices.

    Other aspects were not so important to us:

    • Memory efficiency. Each JSON object has an overhead of one pointer (the maximal size of a union) and one enumeration element (1 byte). The default generalization uses the following C++ data types: std::string for strings, int64_t, uint64_t or double for numbers, std::map for objects, std::vector for arrays, and bool for Booleans. However, you can template the generalized class basic_json to your needs.

    • Speed. There are certainly faster JSON libraries out there. However, if your goal is to speed up your development by adding JSON support with a single header, then this library is the way to go. If you know how to use a std::vector or std::map, you are already set.

    See the contribution guidelines for more information.

    "},{"location":"home/exceptions/","title":"Exceptions","text":""},{"location":"home/exceptions/#overview","title":"Overview","text":""},{"location":"home/exceptions/#base-type","title":"Base type","text":"

    All exceptions inherit from class json::exception (which in turn inherits from std::exception). It is used as the base class for all exceptions thrown by the basic_json class. This class can hence be used as \"wildcard\" to catch exceptions.

    classDiagram\n  direction LR\n    class `std::exception` {\n        <<interface>>\n    }\n\n    class `json::exception` {\n        +const int id\n        +const char* what() const\n    }\n\n    class `json::parse_error` {\n        +const std::size_t byte\n    }\n\n    class `json::invalid_iterator`\n    class `json::type_error`\n    class `json::out_of_range`\n    class `json::other_error`\n\n    `std::exception` <|-- `json::exception`\n    `json::exception` <|-- `json::parse_error`\n    `json::exception` <|-- `json::invalid_iterator`\n    `json::exception` <|-- `json::type_error`\n    `json::exception` <|-- `json::out_of_range`\n    `json::exception` <|-- `json::other_error`
    "},{"location":"home/exceptions/#switch-off-exceptions","title":"Switch off exceptions","text":"

    Exceptions are used widely within the library. They can, however, be switched off with either using the compiler flag -fno-exceptions or by defining the symbol JSON_NOEXCEPTION. In this case, exceptions are replaced by abort() calls. You can further control this behavior by defining JSON_THROW_USER (overriding throw), JSON_TRY_USER (overriding try), and JSON_CATCH_USER (overriding catch).

    Note that JSON_THROW_USER should leave the current scope (e.g., by throwing or aborting), as continuing after it may yield undefined behavior.

    Example

    The code below switches off exceptions and creates a log entry with a detailed error message in case of errors.

    #include <iostream>\n\n#define JSON_TRY_USER if(true)\n#define JSON_CATCH_USER(exception) if(false)\n#define JSON_THROW_USER(exception)                           \\\n    {std::clog << \"Error in \" << __FILE__ << \":\" << __LINE__ \\\n               << \" (function \" << __FUNCTION__ << \") - \"    \\\n               << (exception).what() << std::endl;           \\\n     std::abort();}\n\n#include <nlohmann/json.hpp>\n

    Note the explanatory what() string of exceptions is not available for MSVC if exceptions are disabled, see #2824.

    See documentation of JSON_TRY_USER, JSON_CATCH_USER and JSON_THROW_USER for more information.

    "},{"location":"home/exceptions/#extended-diagnostic-messages","title":"Extended diagnostic messages","text":"

    Exceptions in the library are thrown in the local context of the JSON value they are detected. This makes detailed diagnostics messages, and hence debugging, difficult.

    Example 
    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    json j;\n    j[\"address\"][\"street\"] = \"Fake Street\";\n    j[\"address\"][\"housenumber\"] = \"12\";\n\n    try\n    {\n        int housenumber = j[\"address\"][\"housenumber\"];\n    }\n    catch (const json::exception& e)\n    {\n        std::cout << e.what() << '\\n';\n    }\n}\n

    Output:

    [json.exception.type_error.302] type must be number, but is string\n

    This exception can be hard to debug if storing the value \"12\" and accessing it is further apart.

    To create better diagnostics messages, each JSON value needs a pointer to its parent value such that a global context (i.e., a path from the root value to the value that led to the exception) can be created. That global context is provided as JSON Pointer.

    As this global context comes at the price of storing one additional pointer per JSON value and runtime overhead to maintain the parent relation, extended diagnostics are disabled by default. They can, however, be enabled by defining the preprocessor symbol JSON_DIAGNOSTICS to 1 before including json.hpp.

    Example 
    #include <iostream>\n\n# define JSON_DIAGNOSTICS 1\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    json j;\n    j[\"address\"][\"street\"] = \"Fake Street\";\n    j[\"address\"][\"housenumber\"] = \"12\";\n\n    try\n    {\n        int housenumber = j[\"address\"][\"housenumber\"];\n    }\n    catch (const json::exception& e)\n    {\n        std::cout << e.what() << '\\n';\n    }\n}\n

    Output:

    [json.exception.type_error.302] (/address/housenumber) type must be number, but is string\n

    Now the exception message contains a JSON Pointer /address/housenumber that indicates which value has the wrong type.

    See documentation of JSON_DIAGNOSTICS for more information.

    "},{"location":"home/exceptions/#parse-errors","title":"Parse errors","text":"

    The library throws this exception when a parse error occurs. Parse errors can occur during the deserialization of JSON text, CBOR, MessagePack, as well as when using JSON Patch.

    Exceptions have ids 1xx.

    Byte index

    Member byte holds the byte index of the last read character in the input file.

    For an input with n bytes, 1 is the index of the first character and n+1 is the index of the terminating null byte or the end of file. This also holds true when reading a byte vector (CBOR or MessagePack).

    Example

    The following code shows how a parse_error exception can be caught.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    try\n    {\n        // parsing input with a syntax error\n        json::parse(\"[1,2,3,]\");\n    }\n    catch (const json::parse_error& e)\n    {\n        // output exception information\n        std::cout << \"message: \" << e.what() << '\\n'\n                  << \"exception id: \" << e.id << '\\n'\n                  << \"byte position of error: \" << e.byte << std::endl;\n    }\n}\n

    Output:

    message: [json.exception.parse_error.101] parse error at line 1, column 8: syntax error while parsing value - unexpected ']'; expected '[', '{', or a literal\nexception id: 101\nbyte position of error: 8\n
    "},{"location":"home/exceptions/#jsonexceptionparse_error101","title":"json.exception.parse_error.101","text":"

    This error indicates a syntax error while deserializing a JSON text. The error message describes that an unexpected token (character) was encountered, and the member byte indicates the error position.

    Example message

    Input ended prematurely:

    [json.exception.parse_error.101] parse error at 2: unexpected end of input; expected string literal\n

    No input:

    [json.exception.parse_error.101] parse error at line 1, column 1: attempting to parse an empty input; check that your input string or stream contains the expected JSON\n

    Control character was not escaped:

    [json.exception.parse_error.101] parse error at line 1, column 2: syntax error while parsing value - invalid string: control character U+0009 (HT) must be escaped to \\u0009 or \\\\; last read: '\"<U+0009>'\"\n

    String was not closed:

    [json.exception.parse_error.101] parse error at line 1, column 2: syntax error while parsing value - invalid string: missing closing quote; last read: '\"'\n

    Invalid number format:

    [json.exception.parse_error.101] parse error at line 1, column 3: syntax error while parsing value - invalid number; expected '+', '-', or digit after exponent; last read: '1E'\n

    \\u was not be followed by four hex digits:

    [json.exception.parse_error.101] parse error at line 1, column 6: syntax error while parsing value - invalid string: '\\u' must be followed by 4 hex digits; last read: '\"\\u01\"'\n

    Invalid UTF-8 surrogate pair:

    [json.exception.parse_error.101] parse error at line 1, column 13: syntax error while parsing value - invalid string: surrogate U+DC00..U+DFFF must follow U+D800..U+DBFF; last read: '\"\\uD7FF\\uDC00'\"\n

    Invalid UTF-8 byte:

    [json.exception.parse_error.101] parse error at line 3, column 24: syntax error while parsing value - invalid string: ill-formed UTF-8 byte; last read: '\"vous \\352t'\n

    Tip

    • Make sure the input is correctly read. Try to write the input to standard output to check if, for instance, the input file was successfully opened.
    • Paste the input to a JSON validator like http://jsonlint.com or a tool like jq.
    "},{"location":"home/exceptions/#jsonexceptionparse_error102","title":"json.exception.parse_error.102","text":"

    JSON uses the \\uxxxx format to describe Unicode characters. Code points above 0xFFFF are split into two \\uxxxx entries (\"surrogate pairs\"). This error indicates that the surrogate pair is incomplete or contains an invalid code point.

    Example message

    parse error at 14: missing or wrong low surrogate\n

    Note

    This exception is not used any more. Instead json.exception.parse_error.101 with a more detailed description is used.

    "},{"location":"home/exceptions/#jsonexceptionparse_error103","title":"json.exception.parse_error.103","text":"

    Unicode supports code points up to 0x10FFFF. Code points above 0x10FFFF are invalid.

    Example message

    parse error: code points above 0x10FFFF are invalid\n

    Note

    This exception is not used any more. Instead json.exception.parse_error.101 with a more detailed description is used.

    "},{"location":"home/exceptions/#jsonexceptionparse_error104","title":"json.exception.parse_error.104","text":"

    RFC 6902 requires a JSON Patch document to be a JSON document that represents an array of objects.

    Example message

    [json.exception.parse_error.104] parse error: JSON patch must be an array of objects\n
    "},{"location":"home/exceptions/#jsonexceptionparse_error105","title":"json.exception.parse_error.105","text":"

    An operation of a JSON Patch document must contain exactly one \"op\" member, whose value indicates the operation to perform. Its value must be one of \"add\", \"remove\", \"replace\", \"move\", \"copy\", or \"test\"; other values are errors.

    Example message

    [json.exception.parse_error.105] parse error: operation 'add' must have member 'value'\n
    [json.exception.parse_error.105] parse error: operation 'copy' must have string member 'from'\n
    [json.exception.parse_error.105] parse error: operation value 'foo' is invalid\n

    "},{"location":"home/exceptions/#jsonexceptionparse_error106","title":"json.exception.parse_error.106","text":"

    An array index in a JSON Pointer (RFC 6901) may be 0 or any number without a leading 0.

    Example message

    [json.exception.parse_error.106] parse error: array index '01' must not begin with '0'\n
    "},{"location":"home/exceptions/#jsonexceptionparse_error107","title":"json.exception.parse_error.107","text":"

    A JSON Pointer must be a Unicode string containing a sequence of zero or more reference tokens, each prefixed by a / character.

    Example message

    [json.exception.parse_error.107] parse error at byte 1: JSON pointer must be empty or begin with '/' - was: 'foo'\n
    "},{"location":"home/exceptions/#jsonexceptionparse_error108","title":"json.exception.parse_error.108","text":"

    In a JSON Pointer, only ~0 and ~1 are valid escape sequences.

    Example message

    [json.exception.parse_error.108] parse error: escape character '~' must be followed with '0' or '1'\n
    "},{"location":"home/exceptions/#jsonexceptionparse_error109","title":"json.exception.parse_error.109","text":"

    A JSON Pointer array index must be a number.

    Example messages

    [json.exception.parse_error.109] parse error: array index 'one' is not a number\n
    [json.exception.parse_error.109] parse error: array index '+1' is not a number\n

    "},{"location":"home/exceptions/#jsonexceptionparse_error110","title":"json.exception.parse_error.110","text":"

    When parsing CBOR or MessagePack, the byte vector ends before the complete value has been read.

    Example message

    [json.exception.parse_error.110] parse error at byte 5: syntax error while parsing CBOR string: unexpected end of input\n
    [json.exception.parse_error.110] parse error at byte 2: syntax error while parsing UBJSON value: expected end of input; last byte: 0x5A\n

    "},{"location":"home/exceptions/#jsonexceptionparse_error112","title":"json.exception.parse_error.112","text":"

    An unexpected byte was read in a binary format or length information is invalid (BSON).

    Example messages

    [json.exception.parse_error.112] parse error at byte 1: syntax error while parsing CBOR value: invalid byte: 0x1C\n
    [json.exception.parse_error.112] parse error at byte 1: syntax error while parsing MessagePack value: invalid byte: 0xC1\n
    [json.exception.parse_error.112] parse error at byte 4: syntax error while parsing BJData size: expected '#' after type information; last byte: 0x02\n
    [json.exception.parse_error.112] parse error at byte 4: syntax error while parsing UBJSON size: expected '#' after type information; last byte: 0x02\n
    [json.exception.parse_error.112] parse error at byte 10: syntax error while parsing BSON string: string length must be at least 1, is -2147483648\n
    [json.exception.parse_error.112] parse error at byte 15: syntax error while parsing BSON binary: byte array length cannot be negative, is -1\n

    "},{"location":"home/exceptions/#jsonexceptionparse_error113","title":"json.exception.parse_error.113","text":"

    While parsing a map key, a value that is not a string has been read.

    Example messages

    [json.exception.parse_error.113] parse error at byte 2: syntax error while parsing CBOR string: expected length specification (0x60-0x7B) or indefinite string type (0x7F); last byte: 0xFF\n
    [json.exception.parse_error.113] parse error at byte 2: syntax error while parsing MessagePack string: expected length specification (0xA0-0xBF, 0xD9-0xDB); last byte: 0xFF\n
    [json.exception.parse_error.113] parse error at byte 2: syntax error while parsing UBJSON char: byte after 'C' must be in range 0x00..0x7F; last byte: 0x82\n

    "},{"location":"home/exceptions/#jsonexceptionparse_error114","title":"json.exception.parse_error.114","text":"

    The parsing of the corresponding BSON record type is not implemented (yet).

    Example message

    [json.exception.parse_error.114] parse error at byte 5: Unsupported BSON record type 0xFF\n
    "},{"location":"home/exceptions/#jsonexceptionparse_error115","title":"json.exception.parse_error.115","text":"

    A UBJSON high-precision number could not be parsed.

    Example message

    [json.exception.parse_error.115] parse error at byte 5: syntax error while parsing UBJSON high-precision number: invalid number text: 1A\n
    "},{"location":"home/exceptions/#iterator-errors","title":"Iterator errors","text":"

    This exception is thrown if iterators passed to a library function do not match the expected semantics.

    Exceptions have ids 2xx.

    Example

    The following code shows how an invalid_iterator exception can be caught.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    try\n    {\n        // calling iterator::key() on non-object iterator\n        json j = \"string\";\n        json::iterator it = j.begin();\n        auto k = it.key();\n    }\n    catch (const json::invalid_iterator& e)\n    {\n        // output exception information\n        std::cout << \"message: \" << e.what() << '\\n'\n                  << \"exception id: \" << e.id << std::endl;\n    }\n}\n

    Output:

    message: [json.exception.invalid_iterator.207] cannot use key() for non-object iterators\nexception id: 207\n
    "},{"location":"home/exceptions/#jsonexceptioninvalid_iterator201","title":"json.exception.invalid_iterator.201","text":"

    The iterators passed to constructor basic_json(InputIT first, InputIT last) are not compatible, meaning they do not belong to the same container. Therefore, the range (first, last) is invalid.

    Example message

    [json.exception.invalid_iterator.201] iterators are not compatible\n
    "},{"location":"home/exceptions/#jsonexceptioninvalid_iterator202","title":"json.exception.invalid_iterator.202","text":"

    In the erase or insert function, the passed iterator pos does not belong to the JSON value for which the function was called. It hence does not define a valid position for the deletion/insertion.

    Example messages

    [json.exception.invalid_iterator.202] iterator does not fit current value\n
    [json.exception.invalid_iterator.202] iterators first and last must point to objects\n

    "},{"location":"home/exceptions/#jsonexceptioninvalid_iterator203","title":"json.exception.invalid_iterator.203","text":"

    Either iterator passed to function erase(IteratorType first, IteratorType last) does not belong to the JSON value from which values shall be erased. It hence does not define a valid range to delete values from.

    Example message

    [json.exception.invalid_iterator.203] iterators do not fit current value\n
    "},{"location":"home/exceptions/#jsonexceptioninvalid_iterator204","title":"json.exception.invalid_iterator.204","text":"

    When an iterator range for a primitive type (number, boolean, or string) is passed to a constructor or an erase function, this range has to be exactly (begin(), end()), because this is the only way the single stored value is expressed. All other ranges are invalid.

    Example message

    [json.exception.invalid_iterator.204] iterators out of range\n
    "},{"location":"home/exceptions/#jsonexceptioninvalid_iterator205","title":"json.exception.invalid_iterator.205","text":"

    When an iterator for a primitive type (number, boolean, or string) is passed to an erase function, the iterator has to be the begin() iterator, because it is the only way to address the stored value. All other iterators are invalid.

    Example message

    [json.exception.invalid_iterator.205] iterator out of range\n
    "},{"location":"home/exceptions/#jsonexceptioninvalid_iterator206","title":"json.exception.invalid_iterator.206","text":"

    The iterators passed to constructor basic_json(InputIT first, InputIT last) belong to a JSON null value and hence to not define a valid range.

    Example message

    [json.exception.invalid_iterator.206] cannot construct with iterators from null\n
    "},{"location":"home/exceptions/#jsonexceptioninvalid_iterator207","title":"json.exception.invalid_iterator.207","text":"

    The key() member function can only be used on iterators belonging to a JSON object, because other types do not have a concept of a key.

    Example message

    [json.exception.invalid_iterator.207] cannot use key() for non-object iterators\n
    "},{"location":"home/exceptions/#jsonexceptioninvalid_iterator208","title":"json.exception.invalid_iterator.208","text":"

    The operator[] to specify a concrete offset cannot be used on iterators belonging to a JSON object, because JSON objects are unordered.

    Example message

    [json.exception.invalid_iterator.208] cannot use operator[] for object iterators\n
    "},{"location":"home/exceptions/#jsonexceptioninvalid_iterator209","title":"json.exception.invalid_iterator.209","text":"

    The offset operators (+, -, +=, -=) cannot be used on iterators belonging to a JSON object, because JSON objects are unordered.

    Example message

    [json.exception.invalid_iterator.209] cannot use offsets with object iterators\n
    "},{"location":"home/exceptions/#jsonexceptioninvalid_iterator210","title":"json.exception.invalid_iterator.210","text":"

    The iterator range passed to the insert function is not compatible, meaning they do not belong to the same container. Therefore, the range (first, last) is invalid.

    Example message

    [json.exception.invalid_iterator.210] iterators do not fit\n
    "},{"location":"home/exceptions/#jsonexceptioninvalid_iterator211","title":"json.exception.invalid_iterator.211","text":"

    The iterator range passed to the insert function must not be a subrange of the container to insert to.

    Example message

    [json.exception.invalid_iterator.211] passed iterators may not belong to container\n
    "},{"location":"home/exceptions/#jsonexceptioninvalid_iterator212","title":"json.exception.invalid_iterator.212","text":"

    When two iterators are compared, they must belong to the same container.

    Example message

    [json.exception.invalid_iterator.212] cannot compare iterators of different containers\n
    "},{"location":"home/exceptions/#jsonexceptioninvalid_iterator213","title":"json.exception.invalid_iterator.213","text":"

    The order of object iterators cannot be compared, because JSON objects are unordered.

    Example message

    [json.exception.invalid_iterator.213] cannot compare order of object iterators\n
    "},{"location":"home/exceptions/#jsonexceptioninvalid_iterator214","title":"json.exception.invalid_iterator.214","text":"

    Cannot retrieve value from iterator: The iterator either refers to a null value, or it refers to a primitive type (number, boolean, or string), but does not match the iterator returned by begin().

    Example message

    [json.exception.invalid_iterator.214] cannot get value\n
    "},{"location":"home/exceptions/#type-errors","title":"Type errors","text":"

    This exception is thrown in case of a type error; that is, a library function is executed on a JSON value whose type does not match the expected semantics.

    Exceptions have ids 3xx.

    Example

    The following code shows how a type_error exception can be caught.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    try\n    {\n        // calling push_back() on a string value\n        json j = \"string\";\n        j.push_back(\"another string\");\n    }\n    catch (const json::type_error& e)\n    {\n        // output exception information\n        std::cout << \"message: \" << e.what() << '\\n'\n                  << \"exception id: \" << e.id << std::endl;\n    }\n}\n

    Output:

    message: [json.exception.type_error.308] cannot use push_back() with string\nexception id: 308\n
    "},{"location":"home/exceptions/#jsonexceptiontype_error301","title":"json.exception.type_error.301","text":"

    To create an object from an initializer list, the initializer list must consist only of a list of pairs whose first element is a string. When this constraint is violated, an array is created instead.

    Example message

    [json.exception.type_error.301] cannot create object from initializer list\n
    "},{"location":"home/exceptions/#jsonexceptiontype_error302","title":"json.exception.type_error.302","text":"

    During implicit or explicit value conversion, the JSON type must be compatible with the target type. For instance, a JSON string can only be converted into string types, but not into numbers or boolean types.

    Example messages

    [json.exception.type_error.302] type must be object, but is null\n
    [json.exception.type_error.302] type must be string, but is object\n

    "},{"location":"home/exceptions/#jsonexceptiontype_error303","title":"json.exception.type_error.303","text":"

    To retrieve a reference to a value stored in a basic_json object with get_ref, the type of the reference must match the value type. For instance, for a JSON array, the ReferenceType must be array_t &.

    Example messages

    [json.exception.type_error.303] incompatible ReferenceType for get_ref, actual type is object\n
    [json.exception.type_error.303] incompatible ReferenceType for get_ref, actual type is number\"\n

    "},{"location":"home/exceptions/#jsonexceptiontype_error304","title":"json.exception.type_error.304","text":"

    The at() member functions can only be executed for certain JSON types.

    Example messages

    [json.exception.type_error.304] cannot use at() with string\n
    [json.exception.type_error.304] cannot use at() with number\n

    "},{"location":"home/exceptions/#jsonexceptiontype_error305","title":"json.exception.type_error.305","text":"

    The operator[] member functions can only be executed for certain JSON types.

    Example messages

    [json.exception.type_error.305] cannot use operator[] with a string argument with array\n
    [json.exception.type_error.305] cannot use operator[] with a numeric argument with object\n

    "},{"location":"home/exceptions/#jsonexceptiontype_error306","title":"json.exception.type_error.306","text":"

    The value() member functions can only be executed for certain JSON types.

    Example message

    [json.exception.type_error.306] cannot use value() with number\n
    "},{"location":"home/exceptions/#jsonexceptiontype_error307","title":"json.exception.type_error.307","text":"

    The erase() member functions can only be executed for certain JSON types.

    Example message

    [json.exception.type_error.307] cannot use erase() with string\n
    "},{"location":"home/exceptions/#jsonexceptiontype_error308","title":"json.exception.type_error.308","text":"

    The push_back() and operator+= member functions can only be executed for certain JSON types.

    Example message

    [json.exception.type_error.308] cannot use push_back() with string\n
    "},{"location":"home/exceptions/#jsonexceptiontype_error309","title":"json.exception.type_error.309","text":"

    The insert() member functions can only be executed for certain JSON types.

    Example messages

    [json.exception.type_error.309] cannot use insert() with array\n
    [json.exception.type_error.309] cannot use insert() with number\n

    "},{"location":"home/exceptions/#jsonexceptiontype_error310","title":"json.exception.type_error.310","text":"

    The swap() member functions can only be executed for certain JSON types.

    Example message

    [json.exception.type_error.310] cannot use swap() with number\n
    "},{"location":"home/exceptions/#jsonexceptiontype_error311","title":"json.exception.type_error.311","text":"

    The emplace() and emplace_back() member functions can only be executed for certain JSON types.

    Example messages

    [json.exception.type_error.311] cannot use emplace() with number\n
    [json.exception.type_error.311] cannot use emplace_back() with number\n

    "},{"location":"home/exceptions/#jsonexceptiontype_error312","title":"json.exception.type_error.312","text":"

    The update() member functions can only be executed for certain JSON types.

    Example message

    [json.exception.type_error.312] cannot use update() with array\n
    "},{"location":"home/exceptions/#jsonexceptiontype_error313","title":"json.exception.type_error.313","text":"

    The unflatten function converts an object whose keys are JSON Pointers back into an arbitrary nested JSON value. The JSON Pointers must not overlap, because then the resulting value would not be well-defined.

    Example message

    [json.exception.type_error.313] invalid value to unflatten\n
    "},{"location":"home/exceptions/#jsonexceptiontype_error314","title":"json.exception.type_error.314","text":"

    The unflatten function only works for an object whose keys are JSON Pointers.

    Example message

    Calling unflatten() on an array [1,2,3]:

    [json.exception.type_error.314] only objects can be unflattened\n
    "},{"location":"home/exceptions/#jsonexceptiontype_error315","title":"json.exception.type_error.315","text":"

    The unflatten() function only works for an object whose keys are JSON Pointers and whose values are primitive.

    Example message

    Calling unflatten() on an object {\"/1\", [1,2,3]}:

    [json.exception.type_error.315] values in object must be primitive\n
    "},{"location":"home/exceptions/#jsonexceptiontype_error316","title":"json.exception.type_error.316","text":"

    The dump() function only works with UTF-8 encoded strings; that is, if you assign a std::string to a JSON value, make sure it is UTF-8 encoded.

    Example message

    Calling dump() on a JSON value containing an ISO 8859-1 encoded string: 

    [json.exception.type_error.316] invalid UTF-8 byte at index 15: 0x6F\n

    Tip

    • Store the source file with UTF-8 encoding.
    • Pass an error handler as last parameter to the dump() function to avoid this exception:
      • json::error_handler_t::replace will replace invalid bytes sequences with U+FFFD
      • json::error_handler_t::ignore will silently ignore invalid byte sequences
    "},{"location":"home/exceptions/#jsonexceptiontype_error317","title":"json.exception.type_error.317","text":"

    The dynamic type of the object cannot be represented in the requested serialization format (e.g., a raw true or null JSON object cannot be serialized to BSON)

    Example messages

    Serializing null to BSON: 

    [json.exception.type_error.317] to serialize to BSON, top-level type must be object, but is null\n
    Serializing [1,2,3] to BSON: 
    [json.exception.type_error.317] to serialize to BSON, top-level type must be object, but is array\n

    Tip

    Encapsulate the JSON value in an object. That is, instead of serializing true, serialize {\"value\": true}

    "},{"location":"home/exceptions/#out-of-range","title":"Out of range","text":"

    This exception is thrown in case a library function is called on an input parameter that exceeds the expected range, for instance, in the case of array indices or nonexisting object keys.

    Exceptions have ids 4xx.

    Example

    The following code shows how an out_of_range exception can be caught.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    try\n    {\n        // calling at() for an invalid index\n        json j = {1, 2, 3, 4};\n        j.at(4) = 10;\n    }\n    catch (const json::out_of_range& e)\n    {\n        // output exception information\n        std::cout << \"message: \" << e.what() << '\\n'\n                  << \"exception id: \" << e.id << std::endl;\n    }\n}\n

    Output:

    message: [json.exception.out_of_range.401] array index 4 is out of range\nexception id: 401\n
    "},{"location":"home/exceptions/#jsonexceptionout_of_range401","title":"json.exception.out_of_range.401","text":"

    The provided array index i is larger than size-1.

    Example message

    array index 3 is out of range\n
    "},{"location":"home/exceptions/#jsonexceptionout_of_range402","title":"json.exception.out_of_range.402","text":"

    The special array index - in a JSON Pointer never describes a valid element of the array, but the index past the end. That is, it can only be used to add elements at this position, but not to read it.

    Example message

    array index '-' (3) is out of range\n
    "},{"location":"home/exceptions/#jsonexceptionout_of_range403","title":"json.exception.out_of_range.403","text":"

    The provided key was not found in the JSON object.

    Example message

    key 'foo' not found\n
    "},{"location":"home/exceptions/#jsonexceptionout_of_range404","title":"json.exception.out_of_range.404","text":"

    A reference token in a JSON Pointer could not be resolved.

    Example message

    unresolved reference token 'foo'\n
    "},{"location":"home/exceptions/#jsonexceptionout_of_range405","title":"json.exception.out_of_range.405","text":"

    The JSON Patch operations 'remove' and 'add' cannot be applied to the root element of the JSON value.

    Example message

    JSON pointer has no parent\n
    "},{"location":"home/exceptions/#jsonexceptionout_of_range406","title":"json.exception.out_of_range.406","text":"

    A parsed number could not be stored as without changing it to NaN or INF.

    Example message

    number overflow parsing '10E1000'\n
    "},{"location":"home/exceptions/#jsonexceptionout_of_range407","title":"json.exception.out_of_range.407","text":"

    This exception previously indicated that the UBJSON and BSON binary formats did not support integer numbers greater than 9223372036854775807 due to limitations in the implemented mapping. However, these limitations have since been resolved, and this exception no longer occurs.

    Exception cannot occur any more

    • Since version 3.9.0, integer numbers beyond int64 are serialized as high-precision UBJSON numbers.
    • Since version 3.12.0, integer numbers beyond int64 are serialized as uint64 BSON numbers.
    "},{"location":"home/exceptions/#jsonexceptionout_of_range408","title":"json.exception.out_of_range.408","text":"

    The size (following #) of an UBJSON array or object exceeds the maximal capacity.

    Example message

    excessive array size: 8658170730974374167\n
    "},{"location":"home/exceptions/#jsonexceptionout_of_range409","title":"json.exception.out_of_range.409","text":"

    Key identifiers to be serialized to BSON cannot contain code point U+0000, since the key is stored as zero-terminated c-string.

    Example message

    BSON key cannot contain code point U+0000 (at byte 2)\n
    "},{"location":"home/exceptions/#further-exceptions","title":"Further exceptions","text":"

    This exception is thrown in case of errors that cannot be classified with the other exception types.

    Exceptions have ids 5xx.

    Example

    The following code shows how an other_error exception can be caught.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\nusing namespace nlohmann::literals;\n\nint main()\n{\n    try\n    {\n        // executing a failing JSON Patch operation\n        json value = R\"({\n            \"best_biscuit\": {\n                \"name\": \"Oreo\"\n            }\n        })\"_json;\n        json patch = R\"([{\n            \"op\": \"test\",\n            \"path\": \"/best_biscuit/name\",\n            \"value\": \"Choco Leibniz\"\n        }])\"_json;\n        value.patch(patch);\n    }\n    catch (const json::other_error& e)\n    {\n        // output exception information\n        std::cout << \"message: \" << e.what() << '\\n'\n                  << \"exception id: \" << e.id << std::endl;\n    }\n}\n

    Output:

    message: [json.exception.other_error.501] unsuccessful: {\"op\":\"test\",\"path\":\"/best_biscuit/name\",\"value\":\"Choco Leibniz\"}\nexception id: 501\n
    "},{"location":"home/exceptions/#jsonexceptionother_error501","title":"json.exception.other_error.501","text":"

    A JSON Patch operation 'test' failed. The unsuccessful operation is also printed.

    Example message

    Executing {\"op\":\"test\", \"path\":\"/baz\", \"value\":\"bar\"} on {\"baz\": \"qux\"}:

    [json.exception.other_error.501] unsuccessful: {\"op\":\"test\",\"path\":\"/baz\",\"value\":\"bar\"}\n
    "},{"location":"home/faq/","title":"Frequently Asked Questions (FAQ)","text":""},{"location":"home/faq/#known-bugs","title":"Known bugs","text":""},{"location":"home/faq/#brace-initialization-yields-arrays","title":"Brace initialization yields arrays","text":"

    Question

    Why does

    json j{true};\n

    and

    json j(true);\n

    yield different results ([true] vs. true)?

    This is a known issue, and -- even worse -- the behavior differs between GCC and Clang. The \"culprit\" for this is the library's constructor overloads for initializer lists to allow syntax like

    json array = {1, 2, 3, 4};\n

    for arrays and

    json object = {{\"one\", 1}, {\"two\", 2}}; \n

    for objects.

    Tip

    To avoid any confusion and ensure portable code, do not use brace initialization with the types basic_json, json, or ordered_json unless you want to create an object or array as shown in the examples above.

    "},{"location":"home/faq/#limitations","title":"Limitations","text":""},{"location":"home/faq/#relaxed-parsing","title":"Relaxed parsing","text":"

    Question

    Can you add an option to ignore trailing commas?

    This library does not support any feature that would jeopardize interoperability.

    "},{"location":"home/faq/#parse-errors-reading-non-ascii-characters","title":"Parse errors reading non-ASCII characters","text":"

    Questions

    • Why is the parser complaining about a Chinese character?
    • Does the library support Unicode?
    • I get an exception [json.exception.parse_error.101] parse error at line 1, column 53: syntax error while parsing value - invalid string: ill-formed UTF-8 byte; last read: '\"Test\u00e9$')\"

    The library supports Unicode input as follows:

    • Only UTF-8 encoded input is supported, which is the default encoding for JSON, according to RFC 8259.
    • std::u16string and std::u32string can be parsed, assuming UTF-16 and UTF-32 encoding, respectively. These encodings are not supported when reading from files or other input containers.
    • Other encodings such as Latin-1 or ISO 8859-1 are not supported and will yield parse or serialization errors.
    • The library will not replace Unicode noncharacters.
    • Invalid surrogates (e.g., incomplete pairs such as \\uDEAD) will yield parse errors.
    • The strings stored in the library are UTF-8 encoded. When using the default string type (std::string), note that its length/size functions return the number of stored bytes rather than the number of characters or glyphs.
    • When you store strings with different encodings in the library, calling dump() may throw an exception unless json::error_handler_t::replace or json::error_handler_t::ignore are used as error handlers.

    In most cases, the parser is right to complain, because the input is not UTF-8 encoded. This is especially true for Microsoft Windows, where Latin-1 or ISO 8859-1 is often the standard encoding.

    "},{"location":"home/faq/#wide-string-handling","title":"Wide string handling","text":"

    Question

    Why are wide strings (e.g., std::wstring) dumped as arrays of numbers?

    As described above, the library assumes UTF-8 as encoding. To store a wide string, you need to change the encoding.

    Example

    #include <codecvt> // codecvt_utf8\n#include <locale>  // wstring_convert\n\n// encoding function\nstd::string to_utf8(std::wstring& wide_string)\n{\n    static std::wstring_convert<std::codecvt_utf8<wchar_t>> utf8_conv;\n    return utf8_conv.to_bytes(wide_string);\n}\n\njson j;\nstd::wstring ws = L\"\u8ecaB1234 \u3053\u3093\u306b\u3061\u306f\";\n\nj[\"original\"] = ws;\nj[\"encoded\"] = to_utf8(ws);\n\nstd::cout << j << std::endl;\n

    The result is:

    {\n  \"encoded\": \"\u8ecaB1234 \u3053\u3093\u306b\u3061\u306f\",\n  \"original\": [36554, 66, 49, 50, 51, 52, 32, 12371, 12435, 12395, 12385, 12399]\n}\n
    "},{"location":"home/faq/#exceptions","title":"Exceptions","text":""},{"location":"home/faq/#parsing-without-exceptions","title":"Parsing without exceptions","text":"

    Question

    Is it possible to indicate a parse error without throwing an exception?

    Yes, see Parsing and exceptions.

    "},{"location":"home/faq/#key-name-in-exceptions","title":"Key name in exceptions","text":"

    Question

    Can I get the key of the object item that caused an exception?

    Yes, you can. Please define the symbol JSON_DIAGNOSTICS to get extended diagnostics messages.

    "},{"location":"home/faq/#serialization-issues","title":"Serialization issues","text":""},{"location":"home/faq/#number-precision","title":"Number precision","text":"

    Question

    • It seems that precision is lost when serializing a double.
    • Can I change the precision for floating-point serialization?

    The library uses std::numeric_limits<number_float_t>::digits10 (15 for IEEE doubles) digits for serialization. This value is sufficient to guarantee roundtripping. If one uses more than this number of digits of precision, then string -> value -> string is not guaranteed to round-trip.

    cppreference.com

    The value of std::numeric_limits<T>::digits10 is the number of base-10 digits that can be represented by the type T without change, that is, any number with this many significant decimal digits can be converted to a value of type T and back to decimal form, without change due to rounding or overflow.

    Tip

    The website https://float.exposed gives a good insight into the internal storage of floating-point numbers.

    See this section on the library's number handling for more information.

    "},{"location":"home/faq/#compilation-issues","title":"Compilation issues","text":""},{"location":"home/faq/#android-sdk","title":"Android SDK","text":"

    Question

    Why does the code not compile with Android SDK?

    Android defaults to using very old compilers and C++ libraries. To fix this, add the following to your Application.mk. This will switch to the LLVM C++ library, the Clang compiler, and enable C++11 and other features disabled by default.

    APP_STL := c++_shared\nNDK_TOOLCHAIN_VERSION := clang3.6\nAPP_CPPFLAGS += -frtti -fexceptions\n

    The code compiles successfully with Android NDK, Revision 9 - 11 (and possibly later) and CrystaX's Android NDK version 10.

    "},{"location":"home/faq/#missing-stl-function","title":"Missing STL function","text":"

    Questions

    • Why do I get a compilation error 'to_string' is not a member of 'std' (or similarly, for strtod or strtof)?
    • Why does the code not compile with MinGW or Android SDK?

    This is not an issue with the code, but rather with the compiler itself. On Android, see above to build with a newer environment. For MinGW, please refer to this site and this discussion for information on how to fix this bug. For Android NDK using APP_STL := gnustl_static, please refer to this discussion.

    "},{"location":"home/license/","title":"License","text":"

    The class is licensed under the MIT License:

    Copyright \u00a9 2013-2025 Niels Lohmann

    Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the \u201cSoftware\u201d), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

    The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

    THE SOFTWARE IS PROVIDED \u201cAS IS\u201d, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

    The class contains the UTF-8 Decoder from Bjoern Hoehrmann which is licensed under the MIT License (see above). Copyright \u00a9 2008-2009 Bj\u00f6rn Hoehrmann bjoern@hoehrmann.de

    The class contains a slightly modified version of the Grisu2 algorithm from Florian Loitsch which is licensed under the MIT License (see above). Copyright \u00a9 2009 Florian Loitsch

    The class contains a copy of Hedley from Evan Nemerson which is licensed as CC0-1.0.

    "},{"location":"home/releases/","title":"Releases","text":""},{"location":"home/releases/#v373","title":"v3.7.3","text":"

    Files

    • include.zip (274 KB)
    • include.zip.asc (1 KB)
    • json.hpp (791 KB)
    • json.hpp.asc (1 KB)

    Release date: 2019-11-17 SHA-256: 3b5d2b8f8282b80557091514d8ab97e27f9574336c804ee666fda673a9b59926 (json.hpp), 87b5884741427220d3a33df1363ae0e8b898099fbc59f1c451113f6732891014 (include.zip)

    "},{"location":"home/releases/#summary","title":"Summary","text":"

    This release fixes a bug introduced in release 3.7.2 which could yield quadratic complexity in destructor calls. All changes are backward-compatible.

    "},{"location":"home/releases/#bug-fixes","title":"Bug Fixes","text":"
    • Removed reserve() calls from the destructor which could lead to quadratic complexity. #1837 #1838
    "},{"location":"home/releases/#deprecated-functions","title":"Deprecated functions","text":"

    This release does not deprecate any functions. As an overview, the following functions have been deprecated in earlier versions and will be removed in the next major version (i.e., 4.0.0):

    • Function iterator_wrapper are deprecated. Please use the member function items() instead.
    • Functions friend std::istream& operator<<(basic_json&, std::istream&) and friend std::ostream& operator>>(const basic_json&, std::ostream&) are deprecated. Please use friend std::istream& operator>>(std::istream&, basic_json&) and friend operator<<(std::ostream&, const basic_json&) instead.
    "},{"location":"home/releases/#v372","title":"v3.7.2","text":"

    Files

    • include.zip (274 KB)
    • include.zip.asc (1 KB)
    • json.hpp (791 KB)
    • json.hpp.asc (1 KB)

    Release date: 2019-11-10 SHA-256: 0a65fcbbe1b334d3f45c9498e5ee28c3f3b2428aea98557da4a3ff12f0f14ad6 (json.hpp), 67f69c9a93b7fa0612dc1b6273119d2c560317333581845f358aaa68bff8f087 (include.zip)

    "},{"location":"home/releases/#summary_1","title":"Summary","text":"

    Project bad_json_parsers tested how JSON parser libraries react on deeply nested inputs. It turns out that this library segfaulted at a certain nesting depth. This bug was fixed with this release. Now the parsing is only bounded by the available memory. All changes are backward-compatible.

    "},{"location":"home/releases/#bug-fixes_1","title":"Bug Fixes","text":"
    • Fixed a bug that lead to stack overflow for deeply nested JSON values (objects, array) by changing the implementation of the destructor from a recursive to an iterative approach. #832, #1419, #1835
    "},{"location":"home/releases/#further-changes","title":"Further Changes","text":"
    • Added WhiteStone Bolt. #1830
    "},{"location":"home/releases/#deprecated-functions_1","title":"Deprecated functions","text":"

    This release does not deprecate any functions. As an overview, the following functions have been deprecated in earlier versions and will be removed in the next major version (i.e., 4.0.0):

    • Function iterator_wrapper are deprecated. Please use the member function items() instead.
    • Functions friend std::istream& operator<<(basic_json&, std::istream&) and friend std::ostream& operator>>(const basic_json&, std::ostream&) are deprecated. Please use friend std::istream& operator>>(std::istream&, basic_json&) and friend operator<<(std::ostream&, const basic_json&) instead.
    "},{"location":"home/releases/#v371","title":"v3.7.1","text":"

    Files

    • include.zip (273 KB)
    • include.zip.asc (1 KB)
    • json.hpp (789 KB)
    • json.hpp.asc (1 KB)

    Release date: 2019-11-06 SHA-256: b5ba7228f3c22a882d379e93d08eab4349458ee16fbf45291347994eac7dc7ce (json.hpp), 77b9f54b34e7989e6f402afb516f7ff2830df551c3a36973085e2c7a6b1045fe (include.zip)

    "},{"location":"home/releases/#summary_2","title":"Summary","text":"

    This release fixes several small bugs in the library. All changes are backward-compatible.

    "},{"location":"home/releases/#bug-fixes_2","title":"Bug Fixes","text":"
    • Fixed a segmentation fault when serializing std::int64_t minimum value. #1708 #1722
    • Fixed the contains() function for JSON Pointers. #1727 #1741
    • Fixed too lax SFINAE guard for conversion from std::pair and std::tuple to json. #1805 #1806 #1825 #1826
    • Fixed some regressions detected by UBSAN. Updated CI to use Clang-Tidy 7.1.0. #1716 #1728
    • Fixed integer truncation in iteration_proxy. #1797
    • Updated Hedley to v11 to fix a E2512 error in MSVC. #1799
    • Fixed a compile error in enum deserialization of non non-default-constructible types. #1647 #1821
    • Fixed the conversion from json to std::valarray.
    "},{"location":"home/releases/#improvements","title":"Improvements","text":"
    • The items() function can now be used with a custom string type. #1765
    • Made json_pointer::back const. #1764 #1769
    • Meson is part of the release archive. #1672 #1694
    • Improved documentation on the Meson and Spack package manager. #1694 #1720
    "},{"location":"home/releases/#further-changes_1","title":"Further Changes","text":"
    • Added GitHub Workflow with ubuntu-latest/GCC 7.4.0 as CI step.
    • Added GCC 9 to Travis CI to compile with C++20 support. #1724
    • Added MSVC 2019 to the AppVeyor CI. #1780
    • Added badge to fuzzing status.
    • Fixed some cppcheck warnings. #1760
    • Fixed several typos in the documentation. #1720 #1767 #1803
    • Added documentation on the JSON_THROW_USER, JSON_TRY_USER, and JSON_CATCH_USER macros to control user-defined exception handling.
    • Used GitHub's CODEOWNERS and SECURITY feature.
    • Removed GLOB from CMake files. #1779
    • Updated to Doctest 2.3.5.
    "},{"location":"home/releases/#deprecated-functions_2","title":"Deprecated functions","text":"

    This release does not deprecate any functions. As an overview, the following functions have been deprecated in earlier versions and will be removed in the next major version (i.e., 4.0.0):

    • Function iterator_wrapper are deprecated. Please use the member function items() instead.
    • Functions friend std::istream& operator<<(basic_json&, std::istream&) and friend std::ostream& operator>>(const basic_json&, std::ostream&) are deprecated. Please use friend std::istream& operator>>(std::istream&, basic_json&) and friend operator<<(std::ostream&, const basic_json&) instead.
    "},{"location":"home/releases/#v370","title":"v3.7.0","text":"

    Files

    • include.zip (143 KB)
    • include.zip.asc (1 KB)
    • json.hpp (782 KB)
    • json.hpp.asc (1 KB)

    Release date: 2019-07-28 SHA-256: a503214947952b69f0062f572cb74c17582a495767446347ce2e452963fc2ca4 (json.hpp), 541c34438fd54182e9cdc68dd20c898d766713ad6d901fb2c6e28ff1f1e7c10d (include.zip)

    "},{"location":"home/releases/#summary_3","title":"Summary","text":"

    This release introduces a few convenience functions and performs a lot of house keeping (bug fixes and small improvements). All changes are backward-compatible.

    "},{"location":"home/releases/#new-features","title":"New Features","text":"
    • Add overload of the contains function to check if a JSON pointer is valid without throwing exceptions, just like its counterpart for object keys. #1600
    • Add a function to_string to allow for generic conversion to strings. #916 #1585
    • Add return value for the emplace_back function, returning a reference to the added element just like C++17 is introducing this for std::vector. #1609
    • Add info how to use the library with the pacman package manager on MSYS2. #1670
    "},{"location":"home/releases/#bug-fixes_3","title":"Bug Fixes","text":"
    • Fix an issue where typedefs with certain names yielded a compilation error. #1642 #1643
    • Fix a conversion to std::string_view in the unit tests. #1634 #1639
    • Fix MSVC Debug build. #1536 #1570 #1608
    • Fix get_to method to clear existing content before writing. #1511 #1555
    • Fix a -Wc++17-extensions warning. nodiscard attributes are now only used with Clang when -std=c++17 is used. #1535 #1551
    "},{"location":"home/releases/#improvements_1","title":"Improvements","text":"
    • Switch from Catch to doctest for the unit tests which speeds up compilation and runtime of the 112,112,308 tests.
    • Add an explicit section to the README about the frequently addressed topics character encoding, comments in JSON, and the order of object keys.
    "},{"location":"home/releases/#further-changes_2","title":"Further Changes","text":"
    • Use GNUInstallDirs to set library install directories. #1673
    • Fix links in the README. #1620 #1621 #1622 #1623 #1625
    • Mention json type on the documentation start page. #1616
    • Complete documentation of value() function with respect to type_error.302 exception. #1601
    • Fix links in the documentation. #1598
    • Add regression tests for MSVC. #1543 #1570
    • Use CircleCI for continuous integration.
    • Use Doozer for continuous integration on Linux (CentOS, Raspbian, Fedora)
    • Add tests to check each CMake flag (JSON_BuildTests, JSON_Install, JSON_MultipleHeaders, JSON_Sanitizer, JSON_Valgrind, JSON_NoExceptions, JSON_Coverage).
    • Use Hedley to avoid re-inventing several compiler-agnostic feature macros like JSON_DEPRECATED, JSON_NODISCARD, JSON_LIKELY, JSON_UNLIKELY, JSON_HAS_CPP_14, or JSON_HAS_CPP_17. Functions taking or returning pointers are annotated accordingly when a pointer will not be null.
    • Build and run tests on AppVeyor in DEBUG and RELEASE mode.
    "},{"location":"home/releases/#deprecated-functions_3","title":"Deprecated functions","text":"

    This release does not deprecate any functions. As an overview, the following functions have been deprecated in earlier versions and will be removed in the next major version (i.e., 4.0.0):

    • Function iterator_wrapper are deprecated. Please use the member function items() instead.
    • Functions friend std::istream& operator<<(basic_json&, std::istream&) and friend std::ostream& operator>>(const basic_json&, std::ostream&) are deprecated. Please use friend std::istream& operator>>(std::istream&, basic_json&) and friend operator<<(std::ostream&, const basic_json&) instead.
    "},{"location":"home/releases/#v361","title":"v3.6.1","text":"

    Files

    • include.zip (136 KB)
    • include.zip.asc (1 KB)
    • json.hpp (711 KB)
    • json.hpp.asc (1 KB)

    Release date: 2019-03-20 SHA-256: d2eeb25d2e95bffeb08ebb7704cdffd2e8fca7113eba9a0b38d60a5c391ea09a (json.hpp), 69cc88207ce91347ea530b227ff0776db82dcb8de6704e1a3d74f4841bc651cf (include.zip)

    "},{"location":"home/releases/#summary_4","title":"Summary","text":"

    This release fixes a regression and a bug introduced by the earlier 3.6.0 release. All changes are backward-compatible.

    "},{"location":"home/releases/#bug-fixes_4","title":"Bug Fixes","text":"
    • Fixed regression of #590 which could lead to compilation errors with GCC 7 and GCC 8. #1530
    • Fixed a compilation error when <Windows.h> was included. #1531
    "},{"location":"home/releases/#further-changes_3","title":"Further Changes","text":"
    • Fixed a warning for missing field initializers. #1527
    "},{"location":"home/releases/#deprecated-functions_4","title":"Deprecated functions","text":"

    This release does not deprecate any functions. As an overview, the following functions have been deprecated in earlier versions and will be removed in the next major version (i.e., 4.0.0):

    • Function iterator_wrapper are deprecated. Please use the member function items() instead.
    • Functions friend std::istream& operator<<(basic_json&, std::istream&) and friend std::ostream& operator>>(const basic_json&, std::ostream&) are deprecated. Please use friend std::istream& operator>>(std::istream&, basic_json&) and friend operator<<(std::ostream&, const basic_json&) instead.
    "},{"location":"home/releases/#v360","title":"v3.6.0","text":"

    Files

    • include.zip (136 KB)
    • include.zip.asc (1 KB)
    • json.hpp (711 KB)
    • json.hpp.asc (1 KB)

    Release date: 2019-03-20 SHA-256: ce9839370f28094c71107c405affb3b08c4a098154988014cbb0800b1c44a831 (json.hpp), 237c5e66e7f8186a02804ce9dbd5f69ce89fe7424ef84adf6142e973bd9532f4 (include.zip)

    \u2139\ufe0f This release introduced a regression. Please update to version 3.6.1!

    "},{"location":"home/releases/#summary_5","title":"Summary","text":"

    This release adds some convenience functions for JSON Pointers, introduces a contains function to check if a key is present in an object, and improves the performance of integer serialization. Furthermore, a lot of small bug fixes and improvements have been made. All changes are backward-compatible.

    "},{"location":"home/releases/#new-features_1","title":"New Features","text":"
    • Overworked the public interface for JSON Pointers. The creation of JSON Pointers is simplified with operator/ and operator/=. JSON Pointers can be inspected with empty, back, and parent_pointer, and manipulated with push_back and pop_back. #1434
    • Added a boolean method contains to check whether an element exists in a JSON object with a given key. Returns false when called on non-object types. #1471 #1474
    "},{"location":"home/releases/#bug-fixes_5","title":"Bug Fixes","text":"
    • Fixed a compilation issues with libc 2.12. #1483 #1514
    • Fixed endian conversion on PPC64. #1489
    • Fixed library to compile with GCC 9. #1472 #1492
    • Fixed a compilation issue with GCC 7 on CentOS. #1496
    • Fixed an integer overflow. #1447
    • Fixed buffer flushing in serializer. #1445 #1446
    "},{"location":"home/releases/#improvements_2","title":"Improvements","text":"
    • The performance of dumping integers has been greatly improved. #1411
    • Added CMake parameter JSON_Install to control whether the library should be installed (default: on). #1330
    • Fixed a lot of compiler and linter warnings. #1400 #1435 #1502
    • Reduced required CMake version from 3.8 to 3.1. #1409 #1428 #1441 #1498
    • Added nodiscard attribute to meta(), array(), object(), from_cbor, from_msgpack, from_ubjson, from_bson, and parse. #1433
    "},{"location":"home/releases/#further-changes_4","title":"Further Changes","text":"
    • Added missing headers. #1500
    • Fixed typos and broken links in README. #1417 #1423 #1425 #1451 #1455 #1491
    • Fixed documentation of parse function. #1473
    • Suppressed warning that cannot be fixed inside the library. #1401 #1468
    • Imroved package manager suppert:
      • Updated Buckaroo instructions. #1495
      • Improved Meson support. #1463
      • Added Conda package manager documentation. #1430
      • Added NuGet package manager documentation. #1132
    • Continuous Integration
      • Removed unstable or deprecated Travis builders (Xcode 6.4 - 8.2) and added Xcode 10.1 builder.
      • Added Clang 7 to Travis CI.
      • Fixed AppVeyor x64 builds. #1374 #1414
    • Updated thirdparty libraries:
      • Catch 1.12.0 -> 1.12.2
      • Google Benchmark 1.3.0 -> 1.4.1
      • Doxygen 1.8.15 -> 1.8.16
    "},{"location":"home/releases/#deprecated-functions_5","title":"Deprecated functions","text":"

    This release does not deprecate any functions. As an overview, the following functions have been deprecated in earlier versions and will be removed in the next major version (i.e., 4.0.0):

    • Function iterator_wrapper are deprecated. Please use the member function items() instead.
    • Functions friend std::istream& operator<<(basic_json&, std::istream&) and friend std::ostream& operator>>(const basic_json&, std::ostream&) are deprecated. Please use friend std::istream& operator>>(std::istream&, basic_json&) and friend operator<<(std::ostream&, const basic_json&) instead.
    "},{"location":"home/releases/#v350","title":"v3.5.0","text":"

    Files

    • include.zip (133 KB)
    • include.zip.asc (1 KB)
    • json.hpp (693 KB)
    • json.hpp.asc (1 KB)

    Release date: 2018-12-22 SHA-256: 8a6dbf3bf01156f438d0ca7e78c2971bca50eec4ca6f0cf59adf3464c43bb9d5 (json.hpp), 3564da9c5b0cf2e032f97c69baedf10ddbc98030c337d0327a215ea72259ea21 (include.zip)

    "},{"location":"home/releases/#summary_6","title":"Summary","text":"

    This release introduces the support for structured bindings and reading from FILE*. Besides, a few bugs have been fixed. All changes are backward-compatible.

    "},{"location":"home/releases/#new-features_2","title":"New Features","text":"

    • Structured bindings are now supported for JSON objects and arrays via the items() member function, so finally this code is possible: 

      for (auto& [key, val] : j.items()) {\n    std::cout << key << ':' << val << '\\n';\n}\n
      #1388 #1391

    • Added support for reading from FILE* to support situations in which streams are nit available or would require too much RAM. #1370 #1392

    "},{"location":"home/releases/#bug-fixes_6","title":"Bug Fixes","text":"
    • The eofbit was not set for input streams when the end of a stream was reached while parsing. #1340 #1343
    • Fixed a bug in the SAX parser for BSON arrays.
    "},{"location":"home/releases/#improvements_3","title":"Improvements","text":"
    • Added support for Clang 5.0.1 (PS4 version). #1341 #1342
    "},{"location":"home/releases/#further-changes_5","title":"Further Changes","text":"
    • Added a warning for implicit conversions to the documentation: It is not recommended to use implicit conversions when reading from a JSON value. Details about this recommendation can be found here. #1363
    • Fixed typos in the documentation. #1329 #1380 #1382
    • Fixed a C4800 warning. #1364
    • Fixed a -Wshadow warning #1346
    • Wrapped std::snprintf calls to avoid error in MSVC. #1337
    • Added code to allow installation via Meson. #1345
    "},{"location":"home/releases/#deprecated-functions_6","title":"Deprecated functions","text":"

    This release does not deprecate any functions. As an overview, the following functions have been deprecated in earlier versions and will be removed in the next major version (i.e., 4.0.0):

    • Function iterator_wrapper are deprecated. Please use the member function items() instead.
    • Functions friend std::istream& operator<<(basic_json&, std::istream&) and friend std::ostream& operator>>(const basic_json&, std::ostream&) are deprecated. Please use friend std::istream& operator>>(std::istream&, basic_json&) and friend operator<<(std::ostream&, const basic_json&) instead.
    "},{"location":"home/releases/#v340","title":"v3.4.0","text":"

    Files

    • include.zip (132 KB)
    • include.zip.asc (1 KB)
    • json.hpp (689 KB)
    • json.hpp.asc (1 KB)

    Release date: 2018-10-30 SHA-256: 63da6d1f22b2a7bb9e4ff7d6b255cf691a161ff49532dcc45d398a53e295835f (json.hpp), bfec46fc0cee01c509cf064d2254517e7fa80d1e7647fea37cf81d97c5682bdc (include.zip)

    "},{"location":"home/releases/#summary_7","title":"Summary","text":"

    This release introduces three new features:

    • BSON (Binary JSON) is next to CBOR, MessagePack, and UBJSON the fourth binary (de)serialization format supported by the library.
    • Adjustable error handlers for invalid Unicode allows to specify the behavior when invalid byte sequences are serialized.
    • Simplified enum/JSON mapping with a macro in case the default mapping to integers is not desired.

    Furthermore, some effort has been invested in improving the parse error messages. Besides, a few bugs have been fixed. All changes are backward-compatible.

    "},{"location":"home/releases/#new-features_3","title":"New Features","text":"
    • The library can read and write a subset of BSON (Binary JSON). All data types known from JSON are supported, whereas other types more tied to MongoDB such as timestamps, object ids, or binary data are currently not implemented. See the README for examples. #1244 #1320
    • The behavior when the library encounters an invalid Unicode sequence during serialization can now be controlled by defining one of three Unicode error handlers: (1) throw an exception (default behavior), (2) replace invalid sequences by the Unicode replacement character (U+FFFD), or (3) ignore/filter invalid sequences. See the documentation of the dump function for examples. #1198 #1314
    • To easily specify a user-defined enum/JSON mapping, a macro NLOHMANN_JSON_SERIALIZE_ENUM has been introduced. See the README section for more information. #1208 #1323
    "},{"location":"home/releases/#bug-fixes_7","title":"Bug Fixes","text":"
    • fixed truncation #1286 #1315
    • fixed an issue with std::pair #1299 #1301
    • fixed an issue with std::variant #1292 #1294
    • fixed a bug in the JSON Pointer parser
    "},{"location":"home/releases/#improvements_4","title":"Improvements","text":"
    • The diagnosis messages for parse errors have been improved: error messages now indicated line/column positions where possible (in addition to a byte count) and also the context in which the error occurred (e.g., \"while parsing a JSON string\"). Example: error parse error at 2: syntax error - invalid string: control character must be escaped; last read: '<U+0009>' is now reported as parse error at line 1, column 2: syntax error while parsing value - invalid string: control character U+0009 (HT) must be escaped to \\u0009 or \\t; last read: '<U+0009>'. #1280 #1288 #1303
    "},{"location":"home/releases/#further-changes_6","title":"Further Changes","text":"
    • improved Meson documentation #1305
    • fixed some more linter warnings #1280
    • fixed Clang detection for third-party Google Benchmark library #1277
    "},{"location":"home/releases/#deprecated-functions_7","title":"Deprecated functions","text":"

    This release does not deprecate any functions. As an overview, the following functions have been deprecated in earlier versions and will be removed in the next major version (i.e., 4.0.0):

    • Function iterator_wrapper are deprecated. Please use the member function items() instead.
    • Functions friend std::istream& operator<<(basic_json&, std::istream&) and friend std::ostream& operator>>(const basic_json&, std::ostream&) are deprecated. Please use friend std::istream& operator>>(std::istream&, basic_json&) and friend operator<<(std::ostream&, const basic_json&) instead.
    "},{"location":"home/releases/#v330","title":"v3.3.0","text":"

    Files

    • include.zip (123 KB)
    • include.zip.asc (1 KB)
    • json.hpp (635 KB)
    • json.hpp.asc (1 KB)

    Release date: 2018-10-05 SHA-256: f1327bb60c58757a3dd2b0c9c45d49503d571337681d950ec621f8374bcc14d4 (json.hpp), 9588d63557333aaa485e92221ec38014a85a6134e7486fe3441e0541a5a89576 (include.zip)

    "},{"location":"home/releases/#summary_8","title":"Summary","text":"

    This release adds support for GCC 4.8. Furthermore, it adds a function get_to to write a JSON value to a passed reference. Another topic of this release was the CMake support which has been overworked and documented.

    Besides, a lot of bugs have been fixed and slight improvements have been made. All changes are backward-compatible.

    "},{"location":"home/releases/#new-features_4","title":"New Features","text":"
    • The library can now also built with GCC 4.8. Though this compiler does not fully support C++11, it can successfully compile and run the test suite. Note that bug 57824 in GCC 4.8 still forbids to use multiline raw strings in arguments to macros. #1257
    • Added new function get_to to write a JSON value to a passed reference. The destination type is automatically derived which allows more succinct code compared to the get function. #1227 #1231
    "},{"location":"home/releases/#bug-fixes_8","title":"Bug Fixes","text":"
    • Fixed a bug in the CMake file that made target_link_libraries to not properly include nlohmann_json. #1243 #1245 #1260
    • Fixed a warning in MSVC 2017 complaining about a constexpr if. #1204 #1268 #1272
    • Fixed a bug that prevented compilation with ICPC. #755 #1222
    • Improved the SFINAE correctness to fix a bug in the conversion operator. #1237 #1238
    • Fixed a -Wctor-dtor-privacy warning. #1224
    • Fixed a warning on a lambda in unevaluated context. #1225 #1230
    • Fixed a bug introduced in version 3.2.0 where defining JSON_CATCH_USER led to duplicate macro definition of JSON_INTERNAL_CATCH. #1213 #1214
    • Fixed a bug that prevented compilation with Clang 3.4.2 in RHEL 7. #1179 #1249
    "},{"location":"home/releases/#improvements_5","title":"Improvements","text":"
    • Added documentation on CMake integration of the library. #1270
    • Changed the CMake file to use find_package(nlohmann_json) without installing the library. #1202
    • Improved error messages in case operator[] is used with the wrong combination (json.exception.type_error.305) of JSON container type and argument type. Example: \"cannot use operator[] with a string argument\". #1220 #1221
    • Added a license and version information to the Meson build file. #1252
    • Removed static assertions to indicated missing to_json or from_json functions as such assertions do not play well with SFINAE. These assertions also led to problems with GMock. #960 #1212 #1228
    • The test suite now does not wait forever if run in a wrong directory and input files are not found. #1262
    • The test suite does not show deprecation warnings for deprecated functions which frequently led to confusion. #1271
    "},{"location":"home/releases/#further-changes_7","title":"Further Changes","text":"
    • GCC 4.8 and Xcode 10 were added to the continuous integration suite at Travis.
    • Added lgtm checks to pull requests.
    • Added tests for CMake integration. #1260
    "},{"location":"home/releases/#deprecated-functions_8","title":"Deprecated functions","text":"

    This release does not deprecate any functions. As an overview, the following functions have been deprecated in earlier versions and will be removed in the next major version (i.e., 4.0.0):

    • Function iterator_wrapper are deprecated. Please use the member function items() instead.
    • Functions friend std::istream& operator<<(basic_json&, std::istream&) and friend std::ostream& operator>>(const basic_json&, std::ostream&) are deprecated. Please use friend std::istream& operator>>(std::istream&, basic_json&) and friend operator<<(std::ostream&, const basic_json&) instead.
    "},{"location":"home/releases/#v320","title":"v3.2.0","text":"

    Files

    • include.zip (124 KB)
    • include.zip.asc (1 KB)
    • json.hpp (636 KB)
    • json.hpp.asc (1 KB)

    Release date: 2018-08-20 SHA-256: ce6b5610a051ec6795fa11c33854abebb086f0fd67c311f5921c3c07f9531b44 (json.hpp), 35ee642558b90e2f9bc758995c4788c4b4d4dec54eef95fb8f38cb4d49c8fc7c (include.zip)

    "},{"location":"home/releases/#summary_9","title":"Summary","text":"

    This release introduces a SAX interface to the library. While this may be a very special feature used by only few people, it allowed to unify all functions that consumed input and created some kind of JSON value. Internally, now all existing functions like parse, accept, from_cbor, from_msgpack, and from_ubjson use the SAX interface with different event processors. This allowed to separate the input processing from the value generation. Furthermore, throwing an exception in case of a parse error is now optional and up to the event processor. Finally, the JSON parser is now non-recursive (meaning it does not use the call stack, but std::vector<bool> to track the hierarchy of structured values) which allows to process nested input more efficiently.

    Furthermore, the library finally is able to parse from wide string types. This is the first step toward opening the library from UTF-8 to UTF-16 and UTF-32.

    This release further fixes several bugs in the library. All changes are backward-compatible.

    "},{"location":"home/releases/#new-features_5","title":"New Features","text":"
    • added a parser with a SAX interface (#971, #1153)
    • support to parse from wide string types std::wstring, std::u16string, and std::u32string; the input will be converted to UTF-8 (#1031)
    • added support for std::string_view when using C++17 (#1028)
    • allow to roundtrip std::map and std::unordered_map from JSON if key type is not convertible to string; in these cases, values are serialized to arrays of pairs (#1079, #1089, #1133, #1138)
    "},{"location":"home/releases/#bug-fixes_9","title":"Bug Fixes","text":"
    • allow to create nullptr_t from JSON allowing to properly roundtrip null values (#1169)
    • allow compare user-defined string types (#1130)
    • better support for algorithms using iterators from items() (#1045, #1134)
    • added parameter to avoid compilation error with MSVC 2015 debug builds (#1114)
    • re-added accidentally skipped unit tests (#1176)
    • fixed MSVC issue with std::swap (#1168)
    "},{"location":"home/releases/#improvements_6","title":"Improvements","text":"
    • key() function for iterators returns a const reference rather than a string copy (#1098)
    • binary formats CBOR, MessagePack, and UBJSON now supports float as type for floating-point numbers (#1021)
    "},{"location":"home/releases/#further-changes_8","title":"Further Changes","text":"
    • changed issue templates
    • improved continuous integration: added builders for Xcode 9.3 and 9.4, added builders for GCC 8 and Clang 6, added builder for MinGW, added builders for MSVC targeting x86
    • required CMake version is now at least 3.8 (#1040)
    • overworked CMake file wrt. packaging (#1048)
    • added package managers: Spack (#1041) and CocoaPods (#1148)
    • fixed Meson include directory (#1142)
    • preprocessor macro JSON_SKIP_UNSUPPORTED_COMPILER_CHECK can skip the rejection of unsupported compilers - use at your own risk! (#1128)
    • preprocessor macro JSON_INTERNAL_CATCH/JSON_INTERNAL_CATCH_USER allows to control the behavior of exception handling inside the library (#1187)
    • added note on char to JSON conversion
    • added note how to send security-related issue via encrypted email
    • removed dependency to std::stringstream (#1117)
    • added SPDX-License-Identifier
    • added updated JSON Parsing Test Suite, described in Parsing JSON is a Minefield \ud83d\udca3
    • updated to Catch 1.12.0
    "},{"location":"home/releases/#deprecated-functions_9","title":"Deprecated functions","text":"

    This release does not deprecate any functions. As an overview, the following functions have been deprecated in earlier versions and will be removed in the next major version (i.e., 4.0.0):

    • Function iterator_wrapper are deprecated. Please use the member function items() instead.
    • Functions friend std::istream& operator<<(basic_json&, std::istream&) and friend std::ostream& operator>>(const basic_json&, std::ostream&) are deprecated. Please use friend std::istream& operator>>(std::istream&, basic_json&) and friend operator<<(std::ostream&, const basic_json&) instead.
    "},{"location":"home/releases/#v312","title":"v3.1.2","text":"

    Files

    • include.zip (115 KB)
    • include.zip.asc (1 KB)
    • json.hpp (582 KB)
    • json.hpp.asc (1 KB)

    Release date: 2018-03-14 SHA-256: fbdfec4b4cf63b3b565d09f87e6c3c183bdd45c5be1864d3fcb338f6f02c1733 (json.hpp), 495362ee1b9d03d9526ba9ccf1b4a9c37691abe3a642ddbced13e5778c16660c (include.zip)

    "},{"location":"home/releases/#summary_10","title":"Summary","text":"

    This release fixes several bugs in the library. All changes are backward-compatible.

    "},{"location":"home/releases/#bug-fixes_10","title":"Bug Fixes","text":"
    • Fixed a memory leak occurring in the parser callback (#1001).
    • Different specializations of basic_json (e.g., using different template arguments for strings or objects) can now be used in assignments (#972, #977, #986).
    • Fixed a logical error in an iterator range check (#992).
    "},{"location":"home/releases/#improvements_7","title":"Improvements","text":"
    • The parser and the serialization now support user-defined string types (#1006, #1009).
    "},{"location":"home/releases/#further-changes_9","title":"Further Changes","text":"
    • Clang Analyzer is now used as additional static analyzer; see make clang_analyze.
    • Overworked README by adding links to the documentation (#981).
    "},{"location":"home/releases/#deprecated-functions_10","title":"Deprecated functions","text":"

    This release does not deprecate any functions. As an overview, the following functions have been deprecated in earlier versions and will be removed in the next major version (i.e., 4.0.0):

    • Function iterator_wrapper are deprecated. Please use the member function items() instead.
    • Functions friend std::istream& operator<<(basic_json&, std::istream&) and friend std::ostream& operator>>(const basic_json&, std::ostream&) are deprecated. Please use friend std::istream& operator>>(std::istream&, basic_json&) and friend operator<<(std::ostream&, const basic_json&) instead.
    "},{"location":"home/releases/#v311","title":"v3.1.1","text":"

    Files

    • include.zip (114 KB)
    • include.zip.asc (1 KB)
    • json.hpp (577 KB)
    • json.hpp.asc (1 KB)

    Release date: 2018-02-13 SHA-256: e14ce5e33d6a2daf748026bd4947f3d9686ca4cfd53d10c3da46a0a9aceb7f2e (json.hpp), fde771d4b9e4f222965c00758a2bdd627d04fb7b59e09b7f3d1965abdc848505 (include.zip)

    "},{"location":"home/releases/#summary_11","title":"Summary","text":"

    This release fixes several bugs in the library. All changes are backward-compatible.

    "},{"location":"home/releases/#bug-fixes_11","title":"Bug Fixes","text":"
    • Fixed parsing of CBOR strings with indefinite length (#961). Earlier versions of this library misinterpreted the CBOR standard and rejected input with the 0x7F start byte.
    • Fixed user-defined conversion to vector type (#924, #969). A wrong SFINAE check rejected code though a user-defined conversion was provided.
    • Fixed documentation of the parser behavior for objects with duplicate keys (#963). The exact behavior is not specified by RFC 8259 and the library now also provides no guarantee which object key is stored.
    • Added check to detect memory overflow when parsing UBJSON containers (#962). The optimized UBJSON format allowed for specifying an array with billions of null elements with a few bytes and the library did not check whether this size exceeded max_size().
    "},{"location":"home/releases/#further-changes_10","title":"Further Changes","text":"
    • Code coverage is now calculated for the individual header files, allowing to find uncovered lines more quickly than by browsing through the single header version (#953, #957).
    • A Makefile target run_benchmarks was added to quickly build and run the benchmark suite.
    • The documentation was harmonized with respect to the header inclusion (#955). Now all examples and the README use #include <nlohmann/json.hpp> to allow for selecting single_include or include or whatever installation folder as include directory.
    • Added note on how to use the library with the cget package manager (#954).
    "},{"location":"home/releases/#deprecated-functions_11","title":"Deprecated functions","text":"

    This release does not deprecate any functions. As an overview, the following functions have been deprecated in earlier versions and will be removed in the next major version (i.e., 4.0.0):

    • Function iterator_wrapper are deprecated. Please use the member function items() instead.
    • Functions friend std::istream& operator<<(basic_json&, std::istream&) and friend std::ostream& operator>>(const basic_json&, std::ostream&) are deprecated. Please use friend std::istream& operator>>(std::istream&, basic_json&) and friend operator<<(std::ostream&, const basic_json&) instead.
    "},{"location":"home/releases/#v310","title":"v3.1.0","text":"

    Files

    • include.zip (114 KB)
    • include.zip.asc (1 KB)
    • json.hpp (577 KB)
    • json.hpp.asc (1 KB)

    Release date: 2018-02-01 SHA-256: d40f614d10a6e4e4e80dca9463da905285f20e93116c36d97d4dc1aa63d10ba4 (json.hpp), 2b7234fca394d1e27b7e017117ed80b7518fafbb4f4c13a7c069624f6f924673 (include.zip)

    "},{"location":"home/releases/#summary_12","title":"Summary","text":"

    This release adds support for the UBJSON format and JSON Merge Patch. It also contains some minor changes and bug fixes. All changes are backward-compatible.

    "},{"location":"home/releases/#new-features_6","title":"New features","text":"
    • The library now supports UBJSON (Universal Binary JSON Specification) as binary format to read and write JSON values space-efficiently. See the documentation overview for a comparison of the different formats CBOR, MessagePack, and UBJSON.
    • JSON Merge Patch (RFC 7386) offers an intuitive means to describe patches between JSON values (#876, #877). See the documentation of merge_patch for more information.
    "},{"location":"home/releases/#improvements_8","title":"Improvements","text":"
    • The library now uses the Grisu2 algorithm for printing floating-point numbers (based on the reference implementation by Florian Loitsch) which produces a short representation which is guaranteed to round-trip (#360, #935, #936).
    • The UTF-8 handling was further simplified by using the decoder of Bj\u00f6rn Hoehrmann in more scenarios.
    "},{"location":"home/releases/#reorganization","title":"Reorganization","text":"
    • Though the library is released as a single header, its development got more and more complicated. With this release, the header is split into several files and the single-header file json.hpp can be generated from these development sources. In the repository, folder include contains the development sources and single_include contains the single json.hpp header (#700, #906, #907, #910, #911, #915, #920, #924, #925, #928, #944).
    • The split further allowed for a forward declaration header include/nlohmann/json_fwd.hpp to speed up compilation times (#314).
    "},{"location":"home/releases/#further-changes_11","title":"Further changes","text":"
    • Google Benchmark is now used for micro benchmarks (see benchmarks folder, #921).
    • The serialization (JSON and binary formats) now properly work with the libraries string template parameter, allowing for optimized string implementations to be used in constraint environments such as embedded software (#941, #950).
    • The exceptional behavior can now be overridden by defining macros JSON_THROW_USER, JSON_TRY_USER, and JSON_CATCH_USER, defining the behavior of throw, try and catch, respectively. This allows to switch off C++'s exception mechanism yet still execute user-defined code in case an error condition occurs (#938).
    • To facilitate the interplay with flex and Bison, the library does not use the variable name yytext any more as it could clash with macro definitions (#933).
    • The library now defines NLOHMANN_JSON_VERSION_MAJOR, NLOHMANN_JSON_VERSION_MINOR, and NLOHMANN_JSON_VERSION_PATCH to allow for conditional compilation based on the included library version (#943, #948).
    • A compilation error with ICC has been fixed (#947).
    • Typos and links in the documentation have been fixed (#900, #930).
    • A compiler error related to incomplete types has been fixed (#919).
    • The tests form the UTF-8 decoder stress test have been added to the test suite.
    "},{"location":"home/releases/#deprecated-functions_12","title":"Deprecated functions","text":"
    • Function iterator_wrapper has been deprecated (#874). Since its introduction, the name was up for discussion, as it was too technical. We now introduced the member function items() with the same semantics. iterator_wrapper will be removed in the next major version (i.e., 4.0.0).

    Furthermore, the following functions are deprecated since version 3.0.0 and will be removed in the next major version (i.e., 4.0.0):

    • friend std::istream& operator<<(basic_json&, std::istream&)
    • friend std::ostream& operator>>(const basic_json&, std::ostream&)

    Please use friend std::istream& operator>>(std::istream&, basic_json&) and friend operator<<(std::ostream&, const basic_json&) instead.

    "},{"location":"home/releases/#v301","title":"v3.0.1","text":"

    Files

    • json.hpp (502 KB)
    • json.hpp.asc (1 KB)

    Release date: 2017-12-29 SHA-256: c9b3591f1bb94e723a0cd7be861733a3a555b234ef132be1e9027a0364118c4c

    "},{"location":"home/releases/#summary_13","title":"Summary","text":"

    This release fixes small issues in the implementation of JSON Pointer and JSON Patch. All changes are backward-compatible.

    "},{"location":"home/releases/#changes","title":"Changes","text":"
    • The \"copy\" operation of JSON Patch (RFC 6902) requests that it is an error if the target path points into a non-existing array or object (see #894 for a detailed description). This release fixes the implementation to detect such invalid target paths and throw an exception.
    • An array index in a JSON Pointer (RFC 6901) must be an integer. This release fixes the implementation to throw an exception in case invalid array indices such as 10e2 are used.
    • Added the JSON Patch tests from Byron Ruth and Mike McCabe.
    • Fixed the documentation of the at(ptr) function with JSON Pointers to list all possible exceptions (see #888).
    • Updated the container overview documentation (see #883).
    • The CMake files now respect the BUILD_TESTING option (see #846, #885)
    • Fixed some compiler warnings (see #858, #882).
    "},{"location":"home/releases/#deprecated-functions_13","title":"Deprecated functions","text":"

    To unify the interfaces and to improve similarity with the STL, the following functions are deprecated since version 3.0.0 and will be removed in the next major version (i.e., 4.0.0):

    • friend std::istream& operator<<(basic_json&, std::istream&)
    • friend std::ostream& operator>>(const basic_json&, std::ostream&)

    Please use friend std::istream& operator>>(std::istream&, basic_json&) and friend operator<<(std::ostream&, const basic_json&) instead.

    "},{"location":"home/releases/#v300","title":"v3.0.0","text":"

    Files

    • json.hpp (501 KB)
    • json.hpp.asc (1 KB)

    Release date: 2017-12-17 SHA-256: 076d4a0cb890a3c3d389c68421a11c3d77c64bd788e85d50f1b77ed252f2a462

    "},{"location":"home/releases/#summary_14","title":"Summary","text":"

    After almost a year, here is finally a new release of JSON for Modern C++, and it is a major one! As we adhere to semantic versioning, this means the release includes some breaking changes, so please read the next section carefully before you update. But don't worry, we also added a few new features and put a lot of effort into fixing a lot of bugs and straighten out a few inconsistencies.

    "},{"location":"home/releases/#breaking-changes","title":"Breaking changes","text":"

    This section describes changes that change the public API of the library and may require changes in code using a previous version of the library. In section \"Moving from 2.x.x to 3.0.0\" at the end of the release notes, we describe in detail how existing code needs to be changed.

    • The library now uses user-defined exceptions instead of re-using those defined in <stdexcept> (#244). This not only allows to add more information to the exceptions (every exception now has an identifier, and parse errors contain the position of the error), but also to easily catch all library exceptions with a single catch(json::exception).
    • When strings with a different encoding as UTF-8 were stored in JSON values, their serialization could not be parsed by the library itself, as only UTF-8 is supported. To enforce this library limitation and improve consistency, non-UTF-8 encoded strings now yield a json::type_error exception during serialization (#838). The check for valid UTF-8 is realized with code from Bj\u00f6rn Hoehrmann.
    • NaN and infinity values can now be stored inside the JSON value without throwing an exception. They are, however, still serialized as null (#388).
    • The library's iterator tag was changed from RandomAccessIterator to BidirectionalIterator (#593). Supporting RandomAccessIterator was incorrect as it assumed an ordering of values in a JSON objects which are unordered by definition.
    • The library does not include the standard headers <iostream>, <ctype>, and <stdexcept> any more. You may need to add these headers to code relying on them.
    • Removed constructor explicit basic_json(std::istream& i, const parser_callback_t cb = nullptr) which was deprecated in version 2.0.0 (#480).
    "},{"location":"home/releases/#deprecated-functions_14","title":"Deprecated functions","text":"

    To unify the interfaces and to improve similarity with the STL, the following functions are now deprecated and will be removed in the next major version (i.e., 4.0.0):

    • friend std::istream& operator<<(basic_json&, std::istream&)
    • friend std::ostream& operator>>(const basic_json&, std::ostream&)

    Please use friend std::istream& operator>>(std::istream&, basic_json&) and friend operator<<(std::ostream&, const basic_json&) instead.

    "},{"location":"home/releases/#new-features_7","title":"New features","text":"

    With all this breaking and deprecation out of the way, let's talk about features!

    • We improved the diagnostic information for syntax errors (#301). Now, an exception json::parse_error is thrown which contains a detailed message on the error, but also a member byte to indicate the byte offset in the input where the error occurred.
    • We added a non-throwing syntax check (#458): The new accept function returns a Boolean indicating whether the input is proper JSON. We also added a Boolean parameter allow_exceptions to the existing parse functions to return a discarded value in case a syntax error occurs instead of throwing an exception.
    • An update function was added to merge two JSON objects (#428). In case you are wondering: the name was inspired by Python.
    • The insert function now also supports an iterator range to add elements to an object.
    • The binary exchange formats CBOR and MessagePack can now be parsed from input streams and written to output streams (#477).
    • Input streams are now only read until the end of a JSON value instead of the end of the input (#367).
    • The serialization function dump now has two optional parameters ensure_ascii to escape all non-ASCII characters with \\uxxxx and an indent_char parameter to choose whether to indent with spaces or tabs (#654).
    • Added built-in type support for C arrays (#502), std::pair and std::tuple (#563, #614), enum and enum class (#545), std::vector<bool> (#494). Fixed support for std::valarray (#702), std::array (#553), and std::map<std::string, std::string> (#600, #607).
    "},{"location":"home/releases/#further-changes_12","title":"Further changes","text":"

    Furthermore, there have been a lot of changes under the hood:

    • Replaced the re2c generated scanner by a self-coded version which allows for a better modularization of the parser and better diagnostics. To test the new scanner, we added millions (8,860,608 to be exact) of unit tests to check all valid and invalid byte sequences of the Unicode standard.
    • Google's OSS-Fuzz is still constantly fuzz-testing the library and found several issues that were fixed in this release (#497, #504, #514, #516, #518, #519, #575).
    • We now also ignore UTF-8 byte order marks when parsing from an iterator range (#602).
    • Values can be now moved from initializer lists (#663).
    • Updated to Catch 1.9.7. Unfortunately, Catch2 currently has some performance issues.
    • The non-exceptional paths of the library are now annotated with __builtin_expect to optimize branch prediction as long as no error occurs.
    • MSVC now produces a stack trace in MSVC if a from_json or to_json function was not found for a user-defined type. We also added a debug visualizer nlohmann_json.natvis for better debugging in MSVC (#844).
    • Overworked the documentation and added even more examples.
    • The build workflow now relies on CMake and CTest. Special flags can be chosen with CMake, including coverage (JSON_Coverage), compilation without exceptions (JSON_NoExceptions), LLVM sanitizers (JSON_Sanitizer), or execution with Valgrind (JSON_Valgrind).
    • Added support for package managers Meson (#576), Conan (#566), Hunter (#671, #829), and vcpkg (#753).
    • Added CI builders: Xcode 8.3, 9.0, 9.1, and 9.2; GCC 7.2; Clang 3.8, 3.9, 4.0, and 5.0; Visual Studio 2017. The library is further built with C++17 settings on the latest Clang, GCC, and MSVC version to quickly detect new issues.
    "},{"location":"home/releases/#moving-from-2xx-to-300","title":"Moving from 2.x.x to 3.0.0","text":""},{"location":"home/releases/#user-defined-exceptions","title":"User-defined Exceptions","text":"

    There are five different exceptions inheriting from json::exception:

    • json::parse_error for syntax errors (including the binary formats),
    • json::invalid_iterator for errors related to iterators,
    • json::type_error for errors where functions were called with the wrong JSON type,
    • json::out_of_range for range errors, and
    • json::other_error for miscellaneous errors.

    To support these exception, the try/catch blocks of your code need to be adjusted:

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    • If an overflow occurs during parsing a number from a JSON text, an exception json::out_of_range is thrown so that the overflow is detected early and roundtripping is guaranteed.

    • NaN and INF floating-point values can be stored in a JSON value and are not replaced by null. That is, the basic_json class behaves like double in this regard (no exception occurs). However, NaN and INF are serialized to null.

    "},{"location":"home/releases/#removal-of-deprecated-functions","title":"Removal of deprecated functions","text":"

    Function explicit basic_json(std::istream& i, const parser_callback_t cb = nullptr) should be replaced by the parse function: Let ss be a stream and cb be a parse callback function.

    Old code:

    json j(ss, cb);\n

    New code:

    json j = json::parse(ss, cb);\n

    If no callback function is used, also the following code works:

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    "},{"location":"home/releases/#v211","title":"v2.1.1","text":"

    Files

    • json.hpp (437 KB)
    • json.hpp.asc (1 KB)

    Release date: 2017-02-25 SHA-256: faa2321beb1aa7416d035e7417fcfa59692ac3d8c202728f9bcc302e2d558f57

    "},{"location":"home/releases/#summary_15","title":"Summary","text":"

    This release fixes a locale-related bug in the parser. To do so, the whole number handling (lexer, parser, and also the serialization) have been overworked. Furthermore, a lot of small changes added up that were added to this release. All changes are backward-compatible.

    "},{"location":"home/releases/#changes_1","title":"Changes","text":"
    • Locales that have a different character than . as decimal separator (e.g., the Norwegian locale nb_NO.UTF-8) led to truncated number parsing or parse errors. The library now has been fixed to work with any locale. Note that . is still the only valid decimal separator for JSON input.
    • Numbers like 1.0 were correctly parsed as floating-point number, but serialized as integer (1). Now, floating-point numbers correctly round trip.
    • Parsing incorrect JSON numbers with leading 0 (0123) could yield a buffer overflow. This is fixed now by detecting such errors directly by the lexer.
    • Constructing a JSON value from a pointer was incorrectly interpreted as a Boolean; such code will now yield a compiler error.
    • Comparing a JSON number with 0 led to a comparison with null. This is fixed now.
    • All throw calls are now wrapped in macros.
    • Starting during the preparation of this release (since 8 February 2017), commits and released files are cryptographically signed with this GPG key. Previous releases have also been signed.
    • The parser for MessagePack and CBOR now supports an optional start index parameter to define a byte offset for the parser.
    • Some more warnings have been fixed. With Clang, the code compiles without warnings with -Weverything (well, it needs -Wno-documentation-unknown-command and -Wno-deprecated-declarations, but you get the point).
    • The code can be compiled easier with many Android NDKs by avoiding macros like UINT8_MAX which previously required defining a preprocessor macro for compilation.
    • The unit tests now compile two times faster.
    • Cotire is used to speed up the build.
    • Fixed a lot of typos in the documentation.
    • Added a section to the README file that lists all used third-party code/tools.
    • Added a note on constructing a string value vs. parsing.
    • The test suite now contains 11202597 unit tests.
    • Improved the Doxygen documentation by shortening the template parameters of class basic_json.
    • Removed Doozer.
    • Added Codacity.
    • Upgraded Catch to version 1.7.2.
    "},{"location":"home/releases/#v210","title":"v2.1.0","text":"

    Files

    • json.hpp (426 KB)
    • json.hpp.asc (1 KB)
    • Release date: 2017-01-28
    • SHA-256: a571dee92515b685784fd527e38405cf3f5e13e96edbfe3f03d6df2e363a767b
    "},{"location":"home/releases/#summary_16","title":"Summary","text":"

    This release introduces a means to convert from/to user-defined types. The release is backwards compatible.

    "},{"location":"home/releases/#changes_2","title":"Changes","text":"
    • The library now offers an elegant way to convert from and to arbitrary value types. All you need to do is to implement two functions: to_json and from_json. Then, a conversion is as simple as putting a = between variables. See the README for more information and examples.
    • Exceptions can now be switched off. This can be done by defining the preprocessor symbol JSON_NOEXCEPTION or by passing -fno-exceptions to your compiler. In case the code would usually thrown an exception, abort() is now called.
    • Information on the library can be queried with the new (static) function meta() which returns a JSON object with information on the version, compiler, and platform. See the documentation for an example.
    • A bug in the CBOR parser was fixed which led to a buffer overflow.
    • The function type_name() is now public. It allows to query the type of a JSON value as string.
    • Added the Big List of Naughty Strings as test case.
    • Updated to Catch v1.6.0.
    • Some typos in the documentation have been fixed.
    "},{"location":"home/releases/#v2010","title":"v2.0.10","text":"

    Files

    • json.hpp (409 KB)
    • json.hpp.asc (1 KB)
    • Release date: 2017-01-02
    • SHA-256: ec27d4e74e9ce0f78066389a70724afd07f10761009322dc020656704ad5296d
    "},{"location":"home/releases/#summary_17","title":"Summary","text":"

    This release fixes several security-relevant bugs in the MessagePack and CBOR parsers. The fixes are backwards compatible.

    "},{"location":"home/releases/#changes_3","title":"Changes","text":"
    • Fixed a lot of bugs in the CBOR and MesssagePack parsers. These bugs occurred if invalid input was parsed and then could lead in buffer overflows. These bugs were found with Google's OSS-Fuzz, see #405, #407, #408, #409, #411, and #412 for more information.
    • We now also use the Doozer continuous integration platform.
    • The complete test suite is now also run with Clang's address sanitizer and undefined-behavior sanitizer.
    • Overworked fuzz testing; CBOR and MessagePack implementations are now fuzz-tested. Furthermore, all fuzz tests now include a round trip which ensures created output can again be properly parsed and yields the same JSON value.
    • Clarified documentation of find() function to always return end() when called on non-object value types.
    • Moved thirdparty test code to test/thirdparty directory.
    "},{"location":"home/releases/#v209","title":"v2.0.9","text":"

    Files

    • json.hpp (406 KB)
    • json.hpp.asc (1 KB)
    • Release date: 2016-12-16
    • SHA-256: fbf3396f13e187d6c214c297bddc742d918ea9b55e10bfb3d9f458b9bfdc22e5
    "},{"location":"home/releases/#summary_18","title":"Summary","text":"

    This release implements with CBOR and MessagePack two binary serialization/deserialization formats. It further contains some small fixes and improvements. The fixes are backwards compatible.

    "},{"location":"home/releases/#changes_4","title":"Changes","text":"
    • The library can now read and write the binary formats CBOR (Concise Binary Object Representation) and MessagePack. Both formats are aimed to produce a very compact representation of JSON which can be parsed very efficiently. See the README file for more information and examples.
    • simplified the iteration implementation allowing to remove dozens of lines of code
    • fixed an integer overflow error detected by Google's OSS-Fuzz
    • suppressed documentation warnings inside the library to facilitate compilation with -Wdocumentation
    • fixed an overflow detection error in the number parser
    • updated contribution guidelines to a list of frequentely asked features that will most likely be never added to the library
    • added a table of contents to the README file to add some structure
    • mentioned the many examples and the documentation in the README file
    • split unit tests into individual independent binaries to speed up compilation and testing
    • the test suite now contains 11201886 tests
    "},{"location":"home/releases/#v208","title":"v2.0.8","text":"

    Files

    • json.hpp (360 KB)
    • json.hpp.asc (1 KB)
    • Release date: 2016-12-02
    • SHA-256: b70db0ad34f8e0e61dc3f0cbab88099336c9674c193d8a3439d93d6aca2d7120
    "},{"location":"home/releases/#summary_19","title":"Summary","text":"

    This release combines a lot of small fixes and improvements. The fixes are backwards compatible.

    "},{"location":"home/releases/#changes_5","title":"Changes","text":"
    • fixed a bug that froze the parser if a passed file was not found (now, std::invalid_argument is thrown)
    • fixed a bug that lead to an error of a file at EOF was parsed again (now, std::invalid_argument is thrown)
    • the well known functions emplace and emplace_back have been added to JSON values and work as expected
    • improved the performance of the serialization (dump function)
    • improved the performance of the deserialization (parser)
    • some continuous integration images at Travis were added and retired; see here for the current continuous integration setup
    • the Coverity scan works again
    • the benchmarking code has been improved to produce more stable results
    • the README file has been extended and includes more frequently asked examples
    • the test suite now contains 8905518 tests
    • updated Catch to version 1.5.8
    "},{"location":"home/releases/#v207","title":"v2.0.7","text":"

    Files

    • json.hpp (355 KB)
    • json.hpp.asc (1 KB)
    • Release date: 2016-11-02
    • SHA-256: 5545c323670f8165bae90b9dc6078825e86ec310d96cc4e5b47233ea43715bbf
    "},{"location":"home/releases/#summary_20","title":"Summary","text":"

    This release fixes a few bugs in the JSON parser found in the Parsing JSON is a Minefield \ud83d\udca3 article. The fixes are backwards compatible.

    "},{"location":"home/releases/#changes_6","title":"Changes","text":"
    • The article Parsing JSON is a Minefield \ud83d\udca3 discusses a lot of pitfalls of the JSON specification. When investigating the published test cases, a few bugs in the library were found and fixed:
    • Files with less than 5 bytes can now be parsed without error.
    • The library now properly rejects any file encoding other than UTF-8. Furthermore, incorrect surrogate pairs are properly detected and rejected.
    • The library now accepts all but one \"yes\" test (y_string_utf16.json): UTF-16 is not supported.
    • The library rejects all but one \"no\" test (n_number_then_00.json): Null bytes are treated as end of file instead of an error. This allows to parse input from null-terminated strings.
    • The string length passed to a user-defined string literal is now exploited to choose a more efficient constructor.
    • A few grammar mistakes in the README file have been fixed.
    "},{"location":"home/releases/#v206","title":"v2.0.6","text":"

    Files

    • json.hpp (349 KB)
    • json.hpp.asc (1 KB)
    • Release date: 2016-10-15
    • SHA256: 459cc93d5e2f503e50c6d5876eb86bfea7daf405f5a567c5a2c9abc2383756ae
    "},{"location":"home/releases/#summary_21","title":"Summary","text":"

    This release fixes the semantics of operator[] for JSON Pointers (see below). This fix is backwards compatible.

    "},{"location":"home/releases/#changes_7","title":"Changes","text":"
    • operator[] for JSON Pointers now behaves like the other versions of operator[] and transforms null values into objects or arrays if required. This allows to created nested structures like j[\"/foo/bar/2\"] = 17 (yielding {\"foo\": \"bar\": [null, null, 17]}) without problems.
    • overworked a helper SFINAE function
    • fixed some documentation issues
    • fixed the CMake files to allow to run the test suite outside the main project directory
    • restored test coverage to 100%.
    "},{"location":"home/releases/#v205","title":"v2.0.5","text":"

    Files

    • json.hpp (347 KB)
    • json.hpp.asc (1 KB)
    • Release date: 2016-09-14
    • SHA-256: 8b7565263a44e2b7d3b89808bc73d2d639037ff0c1f379e3d56dbd77e00b98d9
    "},{"location":"home/releases/#summary_22","title":"Summary","text":"

    This release fixes a regression bug in the stream parser (function parse() and the <</>> operators). This fix is backwards compatible.

    "},{"location":"home/releases/#changes_8","title":"Changes","text":"
    • Bug fix: The end of a file stream was not detected properly which led to parse errors. This bug should have been fixed with 2.0.4, but there was still a flaw in the code.
    "},{"location":"home/releases/#v204","title":"v2.0.4","text":"

    Files

    • json.hpp (347 KB)
    • json.hpp.asc (1 KB)
    • Release date: 2016-09-11
    • SHA-256: 632ceec4c25c4e2153f71470d3a2b992c8355f6d8b4d627d05dd16095cd3aeda
    "},{"location":"home/releases/#summary_23","title":"Summary","text":"

    This release fixes a bug in the stream parser (function parse() and the <</>> operators). This fix is backwards compatible.

    "},{"location":"home/releases/#changes_9","title":"Changes","text":"
    • Bug fix: The end of a file stream was not detected properly which led to parse errors.
    • Fixed a compiler warning about an unused variable.
    "},{"location":"home/releases/#v203","title":"v2.0.3","text":"

    Files

    • json.hpp (347 KB)
    • json.hpp.asc (1 KB)
    • Release date: 2016-08-31
    • SHA-256: 535b73efe5546fde9e763c14aeadfc7b58183c0b3cd43c29741025aba6cf6bd3
    "},{"location":"home/releases/#summary_24","title":"Summary","text":"

    This release combines a lot of small fixes and improvements. The release is backwards compatible.

    "},{"location":"home/releases/#changes_10","title":"Changes","text":"
    • The parser/deserialization functions have been generalized to process any contiguous sequence of 1-byte elements (e.g., char, unsigned char, uint8_t). This includes all kind of string representations (string literals, char arrays, std::string, const char*), contiguous containers (C-style arrays, std::vector, std::array, std::valarray, std::initializer_list). User-defined containers providing random-access iterator access via std::begin and std::end can be used as well. See the documentation (1, 2, 3, 4) for more information. Note that contiguous storage cannot be checked at compile time; if any of the parse functions are called with a noncompliant container, the behavior is undefined and will most likely yield segmentation violation. The preconditions are enforced by an assertion unless the library is compiled with preprocessor symbol NDEBUG.
    • As a general remark on assertions: The library uses assertions to preclude undefined behavior. A prominent example for this is the operator[] for const JSON objects. The behavior of this const version of the operator is undefined if the given key does not exist in the JSON object, because unlike the non-const version, it cannot add a null value at the given key. Assertions can be switched of by defining the preprocessor symbol NDEBUG. See the documentation of assert for more information.
    • In the course of cleaning up the parser/deserialization functions, the constructor basic_json(std::istream&, const parser_callback_t) has been deprecated and will be deleted with the next major release 3.0.0 to unify the interface of the library. Deserialization will be done by stream operators or by calling one of the parse functions. That is, calls like json j(i); for an input stream i need to be replaced by json j = json::parse(i);. Compilers will produce a deprecation warning if client code uses this function.
    • Minor improvements:
    • Improved the performance of the serialization by avoiding the re-creation of a locale object.
    • Fixed two MSVC warnings. Compiling the test suite with /Wall now only warns about non-inlined functions (C4710) and the deprecation of the constructor from input-stream (C4996).
    • Some project internals:
    • The project has qualified for the Core Infrastructure Initiative Best Practices Badge. While most requirements where already satisfied, some led to more explicit documentation of quality-ensuring procedures. For instance, static analysis is now executed with every commit on the build server. Furthermore, the contribution guidelines document how to communicate security issues privately.
    • The test suite has been overworked and split into several files to allow for faster compilation and analysis. The execute the test suite, simply execute make check.
    • The continuous integration with Travis was extended with Clang versions 3.6.0 to 3.8.1 and now includes 18 different compiler/OS combinations.
    • An 11-day run of American fuzzy lop checked 962 million inputs on the parser and found no issue.
    "},{"location":"home/releases/#v202","title":"v2.0.2","text":"

    Files

    • json.hpp (338 KB)
    • json.hpp.asc (1 KB)
    • Release date: 2016-07-31
    • SHA-256: 8e97b7965b4594b00998d6704465412360e1a0ed927badb51ded8b82291a8f3d
    "},{"location":"home/releases/#summary_25","title":"Summary","text":"

    This release combines a lot of small fixes and improvements. The release is backwards compatible.

    "},{"location":"home/releases/#changes_11","title":"Changes","text":"
    • The parser has been overworked, and a lot of small issues have been fixed:
    • Improved parser performance by avoiding recursion and using move semantics for the return value.
    • Unescaped control characters \\x10-\\x1f are not accepted any more.
    • Fixed a bug in the parser when reading from an input stream.
    • Improved test case coverage for UTF-8 parsing: now, all valid Unicode code points are tested both escaped and unescaped.
    • The precision of output streams is now preserved by the parser.
    • Started to check the code correctness by proving termination of important loops. Furthermore, individual assertions have been replaced by a more systematic function which checks the class invariants. Note that assertions should be switched off in production by defining the preprocessor macro NDEBUG, see the documentation of assert.
    • A lot of code cleanup: removed unused headers, fixed some compiler warnings, and fixed a build error for Windows-based Clang builds.
    • Added some compile-time checks:
    • Unsupported compilers are rejected during compilation with an #error command.
    • Static assertion prohibits code with incompatible pointer types used in get_ptr().
    • Improved the documentation, and adjusted the documentation script to choose the correct version of sed.
    • Replaced a lot of \"raw loops\" by STL functions like std::all_of, std::for_each, or std::accumulate. This facilitates reasoning about termination of loops and sometimes allowed to simplify functions to a single return statement.
    • Implemented a value() function for JSON pointers (similar to at function).
    • The Homebrew formula (see Integration) is now tested for all Xcode builds (6.1 - 8.x) with Travis.
    • Avoided output to std::cout in the test cases.
    "},{"location":"home/releases/#v201","title":"v2.0.1","text":"

    Files

    • json.hpp (321 KB)
    • json.hpp.asc (1 KB)
    • Release date: 2016-06-28
    • SHA-256: ef550fcd7df572555bf068e9ec4e9d3b9e4cdd441cecb0dcea9ea7fd313f72dd
    "},{"location":"home/releases/#summary_26","title":"Summary","text":"

    This release fixes a performance regression in the JSON serialization (function dump()). This fix is backwards compatible.

    "},{"location":"home/releases/#changes_12","title":"Changes","text":"
    • The locale of the output stream (or the internal string stream if a JSON value is serialized to a string) is now adjusted once for the whole serialization instead of for each floating-point number.
    • The locale of an output stream is now correctly reset to the previous value by the JSON library.
    "},{"location":"home/releases/#v200","title":"v2.0.0","text":"

    Files

    • json.hpp (321 KB)
    • json.hpp.asc (1 KB)
    • Release date: 2016-06-24
    • SHA-256: ac9e1fb25c2ac9ca5fc501fcd2fe3281fe04f07018a1b48820e7b1b11491bb6c
    "},{"location":"home/releases/#summary_27","title":"Summary","text":"

    This release adds several features such as JSON Pointers, JSON Patch, or support for 64 bit unsigned integers. Furthermore, several (subtle) bugs have been fixed.

    As noexcept and constexpr specifier have been added to several functions, the public API has effectively been changed in a (potential) non-backwards compatible manner. As we adhere to Semantic Versioning, this calls for a new major version, so say hello to 2\ufe0f\u20e3.0\ufe0f\u20e3.0\ufe0f\u20e3.

    "},{"location":"home/releases/#changes_13","title":"Changes","text":"
    • \ud83d\udd1f A JSON value now uses uint64_t (default value for template parameter NumberUnsignedType) as data type for unsigned integer values. This type is used automatically when an unsigned number is parsed. Furthermore, constructors, conversion operators and an is_number_unsigned() test have been added.
    • \ud83d\udc49 JSON Pointer (RFC 6901) support: A JSON Pointer is a string (similar to an XPath expression) to address a value inside a structured JSON value. JSON Pointers can be used in at() and operator[] functions. Furthermore, JSON values can be \u201cflattened\u201d to key/value pairs using flatten() where each key is a JSON Pointer. The original value can be restored by \u201cunflattening\u201d the flattened value using unflatten().
    • \ud83c\udfe5 JSON Patch (RFC 6902) support. A JSON Patch is a JSON value that describes the required edit operations (add, change, remove, \u2026) to transform a JSON value into another one. A JSON Patch can be created with function diff(const basic_json&) and applied with patch(const basic_json&). Note the created patches use a rather primitive algorithm so far and leave room for improvement.
    • \ud83c\uddea\ud83c\uddfa The code is now locale-independent: Floating-point numbers are always serialized with a period (.) as decimal separator and ignores different settings from the locale.
    • \ud83c\udf7a Homebrew support: Install the library with brew tap nlohmann/json && brew install nlohmann_json.
    • Added constructor to create a JSON value by parsing a std::istream (e.g., std::stringstream or std::ifstream).
    • Added noexcept specifier to basic_json(boolean_t), basic_json(const number_integer_t), basic_json(const int), basic_json(const number_float_t), iterator functions (begin(), end(), etc.)
    • When parsing numbers, the sign of 0.0 (vs. -0.0) is preserved.
    • Improved MSVC 2015, Android, and MinGW support. See README for more information.
    • Improved test coverage (added 2,225,386 tests).
    • Removed some misuses of std::move.
    • Fixed several compiler warnings.
    • Improved error messages from JSON parser.
    • Updated to re2c to version 0.16 to use a minimal DFAs for the lexer.
    • Updated test suite to use Catch version 1.5.6.
    • Made type getters (is_number, etc.) and const value access constexpr.
    • Functions push_back and operator+= now work with key/value pairs passed as initializer list, e.g. j_object += {\"key\", 1}.
    • Overworked CMakeLists.txt to make it easier to integrate the library into other projects.
    "},{"location":"home/releases/#notes","title":"Notes","text":"
    • Parser error messages are still very vague and contain no information on the error location.
    • The implemented diff function is rather primitive and does not create minimal diffs.
    • The name of function iteration_wrapper may change in the future and the function will be deprecated in the next release.
    • Roundtripping (i.e., parsing a JSON value from a string, serializing it, and comparing the strings) of floating-point numbers is not 100% accurate. Note that RFC 8259 defines no format to internally represent numbers and states not requirement for roundtripping. Nevertheless, benchmarks like Native JSON Benchmark treat roundtripping deviations as conformance errors.
    "},{"location":"home/releases/#v110","title":"v1.1.0","text":"

    Files

    • json.hpp (257 KB)
    • json.hpp.asc (1 KB)
    • Release date: 2016-01-24
    • SHA-256: c0cf0e3017798ca6bb18e757ebc570d21a3bdac877845e2b9e9573d183ed2f05
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    This release fixes several small bugs and adds functionality in a backwards-compatible manner. Compared to the last version (1.0.0), the following changes have been made:

    "},{"location":"home/releases/#changes_14","title":"Changes","text":"
    • Fixed: Floating-point numbers are now serialized and deserialized properly such that rountripping works in more cases. [#185, #186, #190, #191, #194]
    • Added: The code now contains assertions to detect undefined behavior during development. As the standard function assert is used, the assertions can be switched off by defining the preprocessor symbol NDEBUG during compilation. [#168]
    • Added: It is now possible to get a reference to the stored values via the newly added function get_ref(). [#128, #184]
    • Fixed: Access to object values via keys (operator[]) now works with all kind of string representations. [#171, #189]
    • Fixed: The code now compiles again with Microsoft Visual Studio 2015. [#144, #167, #188]
    • Fixed: All required headers are now included.
    • Fixed: Typos and other small issues. [#162, #166, #175, #177, #179, #180]
    "},{"location":"home/releases/#notes_1","title":"Notes","text":"

    There are still known open issues (#178, #187) which will be fixed in version 2.0.0. However, these fixes will require a small API change and will not be entirely backwards-compatible.

    "},{"location":"home/releases/#v100","title":"v1.0.0","text":"

    Files

    • json.hpp (243 KB)
    • json.hpp.asc (1 KB)
    • Release date: 2015-12-28
    • SHA-256: 767dc2fab1819d7b9e19b6e456d61e38d21ef7182606ecf01516e3f5230446de
    "},{"location":"home/releases/#summary_29","title":"Summary","text":"

    This is the first official release. Compared to the prerelease version 1.0.0-rc1, only a few minor improvements have been made:

    "},{"location":"home/releases/#changes_15","title":"Changes","text":"
    • Changed: A UTF-8 byte order mark is silently ignored.
    • Changed: sprintf is no longer used.
    • Changed: iterator_wrapper also works for const objects; note: the name may change!
    • Changed: Error messages during deserialization have been improved.
    • Added: The parse function now also works with type std::istream&&.
    • Added: Function value(key, default_value) returns either a copy of an object's element at the specified key or a given default value if no element with the key exists.
    • Added: Public functions are tagged with the version they were introduced. This shall allow for better versioning in the future.
    • Added: All public functions and types are documented (see http://nlohmann.github.io/json/doxygen/) including executable examples.
    • Added: Allocation of all types (in particular arrays, strings, and objects) is now exception-safe.
    • Added: They descriptions of thrown exceptions have been overworked and are part of the tests suite and documentation.
    "},{"location":"home/sponsors/","title":"Sponsors","text":"

    You can sponsor this library at GitHub Sponsors.

    "},{"location":"home/sponsors/#priority-sponsor","title":"Priority Sponsor","text":"
    • Martti Laine
    • Paul Harrington
    "},{"location":"home/sponsors/#named-sponsors","title":"Named Sponsors","text":"
    • Michael Hartmann
    • Stefan Hagen
    • Steve Sperandeo
    • Robert Jefe Lindst\u00e4dt
    • Steve Wagner
    • Lion Yang

    Thanks everyone!

    "},{"location":"integration/","title":"Header only","text":"

    json.hpp is the single required file in single_include/nlohmann or released here. You need to add

    #include <nlohmann/json.hpp>\n\n// for convenience\nusing json = nlohmann::json;\n

    to the files you want to process JSON and set the necessary switches to enable C++11 (e.g., -std=c++11 for GCC and Clang).

    You can further use file single_include/nlohmann/json_fwd.hpp for forward declarations.

    "},{"location":"integration/cmake/","title":"CMake","text":""},{"location":"integration/cmake/#integration","title":"Integration","text":"

    You can use the nlohmann_json::nlohmann_json interface target in CMake. This target populates the appropriate usage requirements for INTERFACE_INCLUDE_DIRECTORIES to point to the appropriate include directories and INTERFACE_COMPILE_FEATURES for the necessary C++11 flags.

    "},{"location":"integration/cmake/#external","title":"External","text":"

    To use this library from a CMake project, you can locate it directly with find_package() and use the namespaced imported target from the generated package configuration:

    Example

    CMakeLists.txt
    cmake_minimum_required(VERSION 3.5)\nproject(ExampleProject LANGUAGES CXX)\n\nfind_package(nlohmann_json 3.12.0 REQUIRED)\n\nadd_executable(example example.cpp)\ntarget_link_libraries(example PRIVATE nlohmann_json::nlohmann_json)\n

    The package configuration file, nlohmann_jsonConfig.cmake, can be used either from an install tree or directly out of the build tree.

    "},{"location":"integration/cmake/#embedded","title":"Embedded","text":"

    To embed the library directly into an existing CMake project, place the entire source tree in a subdirectory and call add_subdirectory() in your CMakeLists.txt file.

    Example

    CMakeLists.txt
    cmake_minimum_required(VERSION 3.5)\nproject(ExampleProject LANGUAGES CXX)\n\n# If you only include this third party in PRIVATE source files, you do not need to install it\n# when your main project gets installed.\nset(JSON_Install OFF CACHE INTERNAL \"\")\n\nadd_subdirectory(nlohmann_json)\n\nadd_executable(example example.cpp)\ntarget_link_libraries(example PRIVATE nlohmann_json::nlohmann_json)\n

    Note

    Do not use include(nlohmann_json/CMakeLists.txt), since that carries with it unintended consequences that will break the build. It is generally discouraged (although not necessarily well documented as such) to use include(...) for pulling in other CMake projects anyways.

    "},{"location":"integration/cmake/#supporting-both","title":"Supporting Both","text":"

    To allow your project to support either an externally supplied or an embedded JSON library, you can use a pattern akin to the following.

    Example

    CMakeLists.txt
    project(ExampleProject LANGUAGES CXX)\n\noption(EXAMPLE_USE_EXTERNAL_JSON \"Use an external JSON library\" OFF)\n\nadd_subdirectory(thirdparty)\n\nadd_executable(example example.cpp)\n\n# Note that the namespaced target will always be available regardless of the import method\ntarget_link_libraries(example PRIVATE nlohmann_json::nlohmann_json)\n
    thirdparty/CMakeLists.txt
    if(EXAMPLE_USE_EXTERNAL_JSON)\n    find_package(nlohmann_json 3.12.0 REQUIRED)\nelse()\n    set(JSON_BuildTests OFF CACHE INTERNAL \"\")\n    add_subdirectory(nlohmann_json)\nendif()\n

    thirdparty/nlohmann_json is then a complete copy of this source tree.

    "},{"location":"integration/cmake/#fetchcontent","title":"FetchContent","text":"

    Since CMake v3.11, FetchContent can be used to automatically download a release as a dependency at configure time.

    Example

    CMakeLists.txt
    cmake_minimum_required(VERSION 3.11)\nproject(ExampleProject LANGUAGES CXX)\n\ninclude(FetchContent)\n\nFetchContent_Declare(json URL https://github.com/nlohmann/json/releases/download/v3.12.0/json.tar.xz)\nFetchContent_MakeAvailable(json)\n\nadd_executable(example example.cpp)\ntarget_link_libraries(example PRIVATE nlohmann_json::nlohmann_json)\n

    Note

    It is recommended to use the URL approach described above which is supported as of version 3.10.0. It is also possible to pass the Git repository like

    FetchContent_Declare(json\n    GIT_REPOSITORY https://github.com/nlohmann/json\n    GIT_TAG v3.12.0\n)\n

    However, the repository https://github.com/nlohmann/json download size is quite large.

    "},{"location":"integration/cmake/#cmake-options","title":"CMake Options","text":""},{"location":"integration/cmake/#json_buildtests","title":"JSON_BuildTests","text":"

    Build the unit tests when BUILD_TESTING is enabled. This option is ON by default if the library's CMake project is the top project. That is, when integrating the library as described above, the test suite is not built unless explicitly switched on with this option.

    "},{"location":"integration/cmake/#json_ci","title":"JSON_CI","text":"

    Enable CI build targets. The exact targets are used during the several CI steps and are subject to change without notice. This option is OFF by default.

    "},{"location":"integration/cmake/#json_diagnostics","title":"JSON_Diagnostics","text":"

    Enable extended diagnostic messages by defining macro JSON_DIAGNOSTICS. This option is OFF by default.

    "},{"location":"integration/cmake/#json_diagnostic_positions","title":"JSON_Diagnostic_Positions","text":"

    Enable position diagnostics by defining macro JSON_DIAGNOSTIC_POSITIONS. This option is OFF by default.

    "},{"location":"integration/cmake/#json_disableenumserialization","title":"JSON_DisableEnumSerialization","text":"

    Disable default enum serialization by defining the macro JSON_DISABLE_ENUM_SERIALIZATION. This option is OFF by default.

    "},{"location":"integration/cmake/#json_fasttests","title":"JSON_FastTests","text":"

    Skip expensive/slow test suites. This option is OFF by default. Depends on JSON_BuildTests.

    "},{"location":"integration/cmake/#json_globaludls","title":"JSON_GlobalUDLs","text":"

    Place user-defined string literals in the global namespace by defining the macro JSON_USE_GLOBAL_UDLS. This option is OFF by default.

    "},{"location":"integration/cmake/#json_implicitconversions","title":"JSON_ImplicitConversions","text":"

    Enable implicit conversions by defining macro JSON_USE_IMPLICIT_CONVERSIONS. This option is ON by default.

    "},{"location":"integration/cmake/#json_install","title":"JSON_Install","text":"

    Install CMake targets during install step. This option is ON by default if the library's CMake project is the top project.

    "},{"location":"integration/cmake/#json_legacydiscardedvaluecomparison","title":"JSON_LegacyDiscardedValueComparison","text":"

    Enable the (incorrect) legacy comparison behavior of discarded JSON values by defining macro JSON_USE_LEGACY_DISCARDED_VALUE_COMPARISON. This option is OFF by default.

    "},{"location":"integration/cmake/#json_multipleheaders","title":"JSON_MultipleHeaders","text":"

    Use the non-amalgamated version of the library. This option is OFF by default.

    "},{"location":"integration/cmake/#json_systeminclude","title":"JSON_SystemInclude","text":"

    Treat the library headers like system headers (i.e., adding SYSTEM to the target_include_directories call) to check for this library by tools like Clang-Tidy. This option is OFF by default.

    "},{"location":"integration/cmake/#json_valgrind","title":"JSON_Valgrind","text":"

    Execute the test suite with Valgrind. This option is OFF by default. Depends on JSON_BuildTests.

    "},{"location":"integration/migration_guide/","title":"Migration Guide","text":"

    This page collects some guidelines on how to future-proof your code for future versions of this library.

    "},{"location":"integration/migration_guide/#replace-deprecated-functions","title":"Replace deprecated functions","text":"

    The following functions have been deprecated and will be removed in the next major version (i.e., 4.0.0). All deprecations are annotated with HEDLEY_DEPRECATED_FOR to report which function to use instead.

    "},{"location":"integration/migration_guide/#parsing","title":"Parsing","text":"

    • Function friend std::istream& operator<<(basic_json&, std::istream&) is deprecated since 3.0.0. Please use friend std::istream& operator>>(std::istream&, basic_json&) instead.

      DeprecatedFuture-proof 
      nlohmann::json j;\nstd::stringstream ss(\"[1,2,3]\");\nj << ss;\n
      nlohmann::json j;\nstd::stringstream ss(\"[1,2,3]\");\nss >> j;\n

    • Passing iterator pairs or pointer/length pairs to parsing functions (parse, accept, sax_parse, from_cbor, from_msgpack, from_ubjson, and from_bson via initializer lists is deprecated since 3.8.0. Instead, pass two iterators; for instance, call from_cbor(ptr, ptr+len) instead of from_cbor({ptr, len}).

      DeprecatedFuture-proof 
      const char* s = \"[1,2,3]\";\nbool ok = nlohmann::json::accept({s, s + std::strlen(s)});\n
      const char* s = \"[1,2,3]\";\nbool ok = nlohmann::json::accept(s, s + std::strlen(s));\n
    "},{"location":"integration/migration_guide/#json-pointers","title":"JSON Pointers","text":"

    • Comparing JSON Pointers with strings via operator== and operator!= is deprecated since 3.11.2. To compare a json_pointer p with a string s, convert s to a json_pointer first and use json_pointer::operator== or json_pointer::operator!=.

      DeprecatedFuture-proof 
      nlohmann::json::json_pointer lhs(\"/foo/bar/1\");\nassert(lhs == \"/foo/bar/1\");\n
      nlohmann::json::json_pointer lhs(\"/foo/bar/1\");\nassert(lhs == nlohmann::json::json_pointer(\"/foo/bar/1\"));\n

    • The implicit conversion from JSON Pointers to string (json_pointer::operator string_t) is deprecated since 3.11.0. Use json_pointer::to_string instead.

      DeprecatedFuture-proof 
      nlohmann::json::json_pointer ptr(\"/foo/bar/1\");\nstd::string s = ptr;\n
      nlohmann::json::json_pointer ptr(\"/foo/bar/1\");\nstd::string s = ptr.to_string();\n

    • Passing a basic_json specialization as template parameter RefStringType to json_pointer is deprecated since 3.11.0. The string type can now be directly provided.

      DeprecatedFuture-proof 
      using my_json = nlohmann::basic_json<std::map, std::vector, my_string_type>;\nnlohmann::json_pointer<my_json> ptr(\"/foo/bar/1\");\n
      nlohmann::json_pointer<my_string_type> ptr(\"/foo/bar/1\");\n

      Thereby, nlohmann::my_json::json_pointer is an alias for nlohmann::json_pointer<my_string_type> and is always an alias to the json_pointer with the appropriate string type for all specializations of basic_json.

    "},{"location":"integration/migration_guide/#miscellaneous-functions","title":"Miscellaneous functions","text":"

    • The function iterator_wrapper is deprecated since 3.1.0. Please use the member function items instead.

      DeprecatedFuture-proof 
      for (auto &x : nlohmann::json::iterator_wrapper(j))\n{\n    std::cout << x.key() << \":\" << x.value() << std::endl;\n}\n
      for (auto &x : j.items())\n{\n    std::cout << x.key() << \":\" << x.value() << std::endl;\n}\n

    • Function friend std::ostream& operator>>(const basic_json&, std::ostream&) is deprecated since 3.0.0. Please use friend operator<<(std::ostream&, const basic_json&) instead.

      DeprecatedFuture-proof 
      j >> std::cout;\n
      std::cout << j;\n

    • The legacy comparison behavior for discarded values is deprecated since 3.11.0. It is already disabled by default and can still be enabled by defining JSON_USE_LEGACY_DISCARDED_VALUE_COMPARISON to 1.

      DeprecatedFuture-proof 
      #define JSON_USE_LEGACY_DISCARDED_VALUE_COMPARISON 1\n#include <nlohmann/json.hpp>\n
      #include <nlohmann/json.hpp>\n
    "},{"location":"integration/migration_guide/#replace-implicit-conversions","title":"Replace implicit conversions","text":"

    Implicit conversions via operator ValueType will be switched off by default in the next major release of the library.

    You can prepare existing code by already defining JSON_USE_IMPLICIT_CONVERSIONS to 0 and replace any implicit conversions with calls to get, get_to, get_ref, or get_ptr.

    DeprecatedFuture-proofFuture-proof (alternative) 
    nlohmann::json j = \"Hello, world!\";\nstd::string s = j;\n
    nlohmann::json j = \"Hello, world!\";\nauto s = j.template get<std::string>();\n
    nlohmann::json j = \"Hello, world!\";\nstd::string s;\nj.get_to(s);\n

    You can prepare existing code by already defining JSON_USE_IMPLICIT_CONVERSIONS to 0 and replace any implicit conversions with calls to get.

    "},{"location":"integration/migration_guide/#import-namespace-literals-for-udls","title":"Import namespace literals for UDLs","text":"

    The user-defined string literals operator\"\"_json and operator\"\"_json_pointer will be removed from the global namespace in the next major release of the library.

    DeprecatedFuture-proof 
    nlohmann::json j = \"[1,2,3]\"_json;\n
    using namespace nlohmann::literals;\nnlohmann::json j = \"[1,2,3]\"_json;\n

    To prepare existing code, define JSON_USE_GLOBAL_UDLS to 0 and bring the string literals into scope where needed.

    "},{"location":"integration/migration_guide/#do-not-hard-code-the-complete-library-namespace","title":"Do not hard-code the complete library namespace","text":"

    The nlohmann namespace contains a sub-namespace to avoid problems when different versions or configurations of the library are used in the same project. Always use nlohmann as namespace or, when the exact version and configuration is relevant, use macro NLOHMANN_JSON_NAMESPACE to denote the namespace.

    DangerousFuture-proofFuture-proof (alternative) 
    void to_json(nlohmann::json_abi_v3_11_2::json& j, const person& p)\n{\n    j[\"age\"] = p.age;\n}\n
    void to_json(nlohmann::json& j, const person& p)\n{\n    j[\"age\"] = p.age;\n}\n
    void to_json(NLOHMANN_JSON_NAMESPACE::json& j, const person& p)\n{\n    j[\"age\"] = p.age;\n}\n
    "},{"location":"integration/migration_guide/#do-not-use-the-details-namespace","title":"Do not use the details namespace","text":"

    The details namespace is not part of the public API of the library and can change in any version without an announcement. Do not rely on any function or type in the details namespace.

    "},{"location":"integration/package_managers/","title":"Package Managers","text":"![Homebrew](../images/package_managers/homebrew.svg){: style=\"height:1em\"}\u00a0[**Homebrew**](#homebrew) `nlohmann-json` \u2003 ![Meson](../images/package_managers/meson.svg){: style=\"height:1em\"}\u00a0[**Meson**](#meson) `nlohmann_json` \u2003 ![Bazel](../images/package_managers/bazel.svg){: style=\"height:1em\"}\u00a0[**Bazel**](#bazel) `nlohmann_json` ![Conan](../images/package_managers/conan.svg){: style=\"height:1em\"}\u00a0[**Conan**](#conan) `nlohmann_json` \u2003 ![Spack](../images/package_managers/spack.svg){: style=\"height:1em\"}\u00a0[**Spack**](#spack) `nlohmann-json` \u2003 [**Hunter**](#hunter) `nlohmann_json` ![vcpkg](../images/package_managers/vcpkg.png){: style=\"height:1em\"}\u00a0[**vcpkg**](#vcpkg) `nlohmann-json` \u2003 [**cget**](#cget) `nlohmann/json` \u2003 ![Swift Package Manager](../images/package_managers/swift.svg){: style=\"height:1em\"}\u00a0[**Swift Package Manager**](#swift-package-manager) `nlohmann/json` ![Nuget](../images/package_managers/nuget.svg){: style=\"height:1em\"}\u00a0[**NuGet**](#nuget) `nlohmann.json` \u2003 ![Conda](../images/package_managers/conda.svg){: style=\"height:1em\"}\u00a0[**Conda**](#conda) `nlohmann_json` \u2003 ![MacPorts](../images/package_managers/macports.svg){: style=\"height:1em\"}\u00a0[**MacPorts**](#macports) `nlohmann-json` ![cpm.cmake](../images/package_managers/CPM.png){: style=\"height:1em\"}\u00a0[**CPM.cmake**](#cpmcmake) `gh:nlohmann/json` ![xmake](../images/package_managers/xmake.svg){: style=\"height:1em\"}\u00a0[**xmake**](#xmake) `nlohmann_json`"},{"location":"integration/package_managers/#running-example","title":"Running example","text":"

    Throughout this page, we will describe how to compile the example file example.cpp below.

    #include <nlohmann/json.hpp>\n#include <iostream>\n#include <iomanip>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    std::cout << std::setw(4) << json::meta() << std::endl;\n}\n

    When executed, this program should create output similar to

    {\n    \"compiler\": {\n        \"c++\": \"201103\",\n        \"family\": \"gcc\",\n        \"version\": \"12.4.0\"\n    },\n    \"copyright\": \"(C) 2013-2025 Niels Lohmann\",\n    \"name\": \"JSON for Modern C++\",\n    \"platform\": \"apple\",\n    \"url\": \"https://github.com/nlohmann/json\",\n    \"version\": {\n        \"major\": 3,\n        \"minor\": 12,\n        \"patch\": 0,\n        \"string\": \"3.12.0\"\n    }\n}\n
    "},{"location":"integration/package_managers/#homebrew","title":"Homebrew","text":"

    Summary

    formula: nlohmann-json

    • Availalbe versions: current version and development version (with --HEAD parameter)
    • The formula is updated with every release.
    • Maintainer: Niels Lohmann
    • File issues at the Homebrew issue tracker
    • Homebrew website

    If you are using Homebrew, you can install the library with

    brew install nlohmann-json\n

    The header can be used directly in your code or via CMake.

    Example: Raw compilation

    1. Create the following file:

      example.cpp
      #include <nlohmann/json.hpp>\n#include <iostream>\n#include <iomanip>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    std::cout << std::setw(4) << json::meta() << std::endl;\n}\n

    2. Install the package:

      brew install nlohmann-json\n

    3. Compile the code and pass the Homebrew prefix to the include path such that the library can be found:

      c++ example.cpp -I$(brew --prefix nlohmann-json)/include -std=c++11 -o example\n
    Example: CMake

    1. Create the following files:

      example.cpp
      #include <nlohmann/json.hpp>\n#include <iostream>\n#include <iomanip>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    std::cout << std::setw(4) << json::meta() << std::endl;\n}\n
      CMakeLists.txt
      cmake_minimum_required(VERSION 3.15)\nproject(json_example)\n\nfind_package(nlohmann_json CONFIG REQUIRED)\n\nadd_executable(json_example example.cpp)\ntarget_link_libraries(json_example PRIVATE nlohmann_json::nlohmann_json)\n

    2. Install the package:

      brew install nlohmann-json\n

    3. Compile the code and pass the Homebrew prefix to CMake to find installed packages via find_package:

      CMAKE_PREFIX_PATH=$(brew --prefix) cmake -S . -B build\ncmake --build build\n
    "},{"location":"integration/package_managers/#meson","title":"Meson","text":"

    Summary

    wrap: nlohmann_json

    • Availalbe versions: current version and select older versions (see WrapDB)
    • The package is update automatically from file meson.build.
    • File issues at the library issue tracker
    • Meson website

    If you are using the Meson Build System, add this source tree as a meson subproject. You may also use the include.zip published in this project's Releases to reduce the size of the vendored source tree. Alternatively, you can get a wrap file by downloading it from Meson WrapDB, or use

    meson wrap install nlohmann_json\n

    Please see the Meson project for any issues regarding the packaging.

    The provided meson.build can also be used as an alternative to CMake for installing nlohmann_json system-wide in which case a pkg-config file is installed. To use it, have your build system require the nlohmann_json pkg-config dependency. In Meson, it is preferred to use the dependency() object with a subproject fallback, rather than using the subproject directly.

    Example: Wrap

    1. Create the following files:

      meson.build
      project('json_example', 'cpp',\n  version: '1.0',\n  default_options: ['cpp_std=c++11']\n)\n\ndependency_json = dependency('nlohmann_json', required: true)\n\nexecutable('json_example',\n  sources: ['example.cpp'],\n  dependencies: [dependency_json],\n  install: true\n)\n
      example.cpp
      #include <nlohmann/json.hpp>\n#include <iostream>\n#include <iomanip>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    std::cout << std::setw(4) << json::meta() << std::endl;\n}\n

    2. Use the Meson WrapDB to fetch the nlohmann/json wrap:

      mkdir subprojects\nmeson wrap install nlohmann_json\n

    3. Build:

      meson setup build\nmeson compile -C build\n
    "},{"location":"integration/package_managers/#bazel","title":"Bazel","text":"

    Summary

    use bazel_dep, git_override, or local_path_override

    • Any version, that is available via Bazel Central Registry
    • File issues at the library issue tracker
    • Bazel website

    This repository provides a Bazel MODULE.bazel and a corresponding BUILD.bazel file. Therefore, this repository can be referenced within a MODULE.bazel by rules such as archive_override, git_override, or local_path_override. To use the library, you need to depend on the target @nlohmann_json//:json (i.e., via deps attribute).

    Example

    1. Create the following files:

      BUILD
      cc_binary(\n    name = \"main\",\n    srcs = [\"example.cpp\"],\n    deps = [\"@nlohmann_json//:json\"],\n)\n
      WORKSPACE
      bazel_dep(name = \"nlohmann_json\", version = \"3.11.3.bcr.1\")\n
      example.cpp
      #include <nlohmann/json.hpp>\n#include <iostream>\n#include <iomanip>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    std::cout << std::setw(4) << json::meta() << std::endl;\n}\n

    2. Build and run:

      bazel build //:main\nbazel run //:main\n
    "},{"location":"integration/package_managers/#conan","title":"Conan","text":"

    Summary

    recipe: nlohmann_json

    • Availalbe versions: current version and older versions (see Conan Center)
    • The package is update automatically via this recipe.
    • File issues at the Conan Center issue tracker
    • Conan website

    If you are using Conan to manage your dependencies, merely add nlohmann_json/x.y.z to your conanfile's requires, where x.y.z is the release version you want to use.

    Example

    1. Create the following files:

      Conanfile.txt
      [requires]\nnlohmann_json/3.12.0\n\n[generators]\nCMakeToolchain\nCMakeDeps\n
      CMakeLists.txt
      cmake_minimum_required(VERSION 3.15)\nproject(json_example)\n\nfind_package(nlohmann_json REQUIRED)\n\nadd_executable(json_example example.cpp)\ntarget_link_libraries(json_example PRIVATE nlohmann_json::nlohmann_json)\n
      example.cpp
      #include <nlohmann/json.hpp>\n#include <iostream>\n#include <iomanip>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    std::cout << std::setw(4) << json::meta() << std::endl;\n}\n

    2. Call Conan:

      conan install . --output-folder=build --build=missing\n

    3. Build:

      cmake -S . -B build -DCMAKE_TOOLCHAIN_FILE=\"conan_toolchain.cmake\" -DCMAKE_BUILD_TYPE=Release\ncmake --build build\n
    "},{"location":"integration/package_managers/#spack","title":"Spack","text":"

    Summary

    package: nlohmann-json

    • Availalbe versions: current version and older versions (see Spack package)
    • The package is updated with every release.
    • Maintainer: Axel Huebl
    • File issues at the Spack issue tracker
    • Spack website

    If you are using Spack to manage your dependencies, you can use the nlohmann-json package via

    spack install nlohmann-json\n

    Please see the Spack project for any issues regarding the packaging.

    Example

    1. Create the following files:

      CMakeLists.txt
      cmake_minimum_required(VERSION 3.15)\nproject(json_example)\n\nfind_package(nlohmann_json REQUIRED)\n\nadd_executable(json_example example.cpp)\ntarget_link_libraries(json_example PRIVATE nlohmann_json::nlohmann_json)\n
      example.cpp
      #include <nlohmann/json.hpp>\n#include <iostream>\n#include <iomanip>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    std::cout << std::setw(4) << json::meta() << std::endl;\n}\n

    2. Install the library:

      spack install nlohmann-json\n

    3. Load the environment for your Spack-installed packages:

      spack load nlohmann-json\n

    4. Build the project with CMake:

      cmake -S . -B build -DCMAKE_PREFIX_PATH=$(spack location -i nlohmann-json)\ncmake --build build\n
    "},{"location":"integration/package_managers/#hunter","title":"Hunter","text":"

    Summary

    package: nlohmann_json

    • Availalbe versions: current version and older versions (see Hunter package)
    • The package is updated with every release.
    • File issues at the Hunter issue tracker
    • Hunter website

    If you are using Hunter on your project for external dependencies, then you can use the nlohmann_json package via

    hunter_add_package(nlohmann_json)\n

    Please see the Hunter project for any issues regarding the packaging.

    Example

    1. Create the following files:

      CMakeLists.txt
      cmake_minimum_required(VERSION 3.15)\n\ninclude(\"cmake/HunterGate.cmake\")\nHunterGate(\n    URL \"https://github.com/cpp-pm/hunter/archive/v0.23.297.tar.gz\"\n    SHA1 \"3319fe6a3b08090df7df98dee75134d68e2ef5a3\"\n)\n\nproject(json_example)\n\nhunter_add_package(nlohmann_json)\nfind_package(nlohmann_json CONFIG REQUIRED)\n\nadd_executable(json_example example.cpp)\ntarget_link_libraries(json_example PRIVATE nlohmann_json::nlohmann_json)\n
      example.cpp
      #include <nlohmann/json.hpp>\n#include <iostream>\n#include <iomanip>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    std::cout << std::setw(4) << json::meta() << std::endl;\n}\n

    2. Download required files

      mkdir cmake\nwget https://raw.githubusercontent.com/cpp-pm/gate/master/cmake/HunterGate.cmake -O cmake/HunterGate.cmake\n

    3. Build the project with CMake:

      cmake -S . -B build\ncmake --build build\n
    "},{"location":"integration/package_managers/#vcpkg","title":"vcpkg","text":"

    Summary

    package: nlohmann-json

    • Availalbe versions: current version
    • The package is updated with every release.
    • File issues at the vcpkg issue tracker
    • vcpkg website

    If you are using vcpkg on your project for external dependencies, then you can install the nlohmann-json package with

    vcpkg install nlohmann-json\n

    and follow the then displayed descriptions. Please see the vcpkg project for any issues regarding the packaging.

    Example

    1. Create the following files:

      CMakeLists.txt
      cmake_minimum_required(VERSION 3.15)\nproject(json_example)\n\nfind_package(nlohmann_json CONFIG REQUIRED)\n\nadd_executable(json_example example.cpp)\ntarget_link_libraries(json_example PRIVATE nlohmann_json::nlohmann_json)\n
      example.cpp
      #include <nlohmann/json.hpp>\n#include <iostream>\n#include <iomanip>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    std::cout << std::setw(4) << json::meta() << std::endl;\n}\n

    2. Install package:

      vcpkg install nlohmann-json\n

    3. Build:

      cmake -S . -B build -DCMAKE_TOOLCHAIN_FILE=$VCPKG_ROOT/scripts/buildsystems/vcpkg.cmake\ncmake --build build\n
    "},{"location":"integration/package_managers/#cget","title":"cget","text":"

    Summary

    package: nlohmann/json

    • Availalbe versions: current version and older versions
    • The package is updated with every release.
    • File issues at the cget issue tracker
    • cget website

    If you are using cget, you can install the latest master version with

    cget install nlohmann/json\n

    A specific version can be installed with cget install nlohmann/json@v3.12.0. Also, the multiple header version can be installed by adding the -DJSON_MultipleHeaders=ON flag (i.e., cget install nlohmann/json -DJSON_MultipleHeaders=ON).

    Example

    1. Create the following files:

      CMakeLists.txt
      cmake_minimum_required(VERSION 3.15)\nproject(json_example)\n\nfind_package(nlohmann_json CONFIG REQUIRED)\n\nadd_executable(json_example example.cpp)\ntarget_link_libraries(json_example PRIVATE nlohmann_json::nlohmann_json)\n
      example.cpp
      #include <nlohmann/json.hpp>\n#include <iostream>\n#include <iomanip>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    std::cout << std::setw(4) << json::meta() << std::endl;\n}\n

    2. Initialize cget

      cget init\n

    3. Install the library

      cget install nlohmann/json\n

    4. Build

      cmake -S . -B build -DCMAKE_TOOLCHAIN_FILE=cget/cget/cget.cmake\ncmake --build build\n
    "},{"location":"integration/package_managers/#swift-package-manager","title":"Swift Package Manager","text":"

    Summary

    package: nlohmann/json

    • Availalbe versions: current version and older versions
    • The package is updated with every release.
    • File issues at the library issue tracker
    • Xcode documentation
    "},{"location":"integration/package_managers/#nuget","title":"NuGet","text":"

    Summary

    package: nlohmann.json

    • Availalbe versions: current and previous versions
    • The package is updated with every release.
    • Maintainer: Hani Kaabi
    • File issues at the maintainer's issue tracker
    • NuGet website

    If you are using NuGet, you can use the package nlohmann.json with

    dotnet add package nlohmann.json\n
    Example

    Probably the easiest way to use NuGet packages is through Visual Studio graphical interface. Just right-click on a project (any C++ project would do) in \u201cSolution Explorer\u201d and select \u201cManage NuGet Packages\u2026\u201d

    Now you can click on \u201cBrowse\u201d tab and find the package you like to install.

    Most of the packages in NuGet gallery are .NET packages and would not be useful in a C++ project. Microsoft recommends adding \u201cnative\u201d and \u201cnativepackage\u201d tags to C++ NuGet packages to distinguish them, but even adding \u201cnative\u201d to search query would still show many .NET-only packages in the list.

    Nevertheless, after finding the package you want, click on \u201cInstall\u201d button and accept confirmation dialogs. After the package is successfully added to the projects, you should be able to build and execute the project without the need for making any more changes to build settings.

    Note

    A few notes:

    • NuGet packages are installed per project and not system-wide. The header and binaries for the package are only available to the project it is added to, and not other projects (obviously unless we add the package to those projects as well)
    • One of the many great things about your elegant work is that it is a header-only library, which makes deployment very straightforward. In case of libraries which need binary deployment (.lib, .dll and .pdb for debug info) the different binaries for each supported compiler version must be added to the NuGet package. Some library creators cram binary versions for all supported Visual C++ compiler versions in the same package, so a single package will support all compilers. Some others create a different package for each compiler version (and you usually see things like \u201cv140\u201d or \u201cvc141\u201d in package name to clarify which VC++ compiler this package supports).
    • Packages can have dependency to other packages, and in this case, NuGet will install all dependencies as well as the requested package recursively.

    What happens behind the scenes

    After you add a NuGet package, three changes occur in the project source directory. Of course, we could make these changes manually instead of using GUI:

    1. A packages.config file will be created (or updated to include the package name if one such file already exists). This file contains a list of the packages required by this project (name and minimum version) and must be added to the project source code repository, so if you move the source code to a new machine, MSBuild/NuGet knows which packages it has to restore (which it does automatically before each build).

      <?xml version=\"1.0\" encoding=\"utf-8\"?>\n<packages>\n  <package id=\"nlohmann.json\" version=\"3.5.0\" targetFramework=\"native\" />\n</packages>\n

    2. A packages folder which contains actual files in the packages (these are header and binary files required for a successful build, plus a few metadata files). In case of this library for example, it contains json.hpp:

      Note

      This directory should not be added to the project source code repository, as it will be restored before each build by MSBuild/NuGet. If you go ahead and delete this folder, then build the project again, it will magically re-appear!

    3. Project MSBuild makefile (which for Visual C++ projects has a .vcxproj extension) will be updated to include settings from the package.

      The important bit for us here is line 170, which tells MSBuild to import settings from packages\\nlohmann.json.3.5.0\\build\\native\\nlohmann.json.targets file. This is a file the package creator created and added to the package (you can see it is one of the two files I created in this repository, the other just contains package attributes like name and version number). What does it contain?

      For our header-only repository, the only setting we need is to add our include directory to the list of AdditionalIncludeDirectories:

      <?xml version=\"1.0\" encoding=\"utf-8\"?>\n<Project ToolsVersion=\"4.0\" xmlns=\"http://schemas.microsoft.com/developer/msbuild/2003\">\n    <ItemDefinitionGroup>\n        <ClCompile>\n            <AdditionalIncludeDirectories>$(MSBuildThisFileDirectory)include;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>\n        </ClCompile>\n    </ItemDefinitionGroup>\n</Project>\n

      For libraries with binary files, we will need to add .lib files to linker inputs and add settings to copy .dll and other redistributable files to output directory, if needed.

      There are other changes to the makefile as well:

      • Lines 165-167 add the packages.config as one of project files (so it is shown in Solution Explorer tree view). It is added as None (no build action) and removing it wouldn\u2019t affect build.

      • Lines 172-177 check to ensure the required packages are present. This will display a build error if package directory is empty (for example when NuGet cannot restore packages because Internet connection is down). Again, if you omit this section, the only change in build would be a more cryptic error message if build fails.

      Note

      Changes to .vcxproj makefile should also be added to project source code repository.

    As you can see, the mechanism NuGet uses to modify project settings is through MSBuild makefiles, so using NuGet with other build systems and compilers (like CMake) as a dependency manager is either impossible or more problematic than useful.

    Please refer to this extensive description for more information.

    "},{"location":"integration/package_managers/#conda","title":"Conda","text":"

    Summary

    package: nlohmann_json

    • Availalbe versions: current and previous versions
    • The package is updated with every release.
    • File issues at the feedstock's issue tracker
    • Conda documentation

    If you are using conda, you can use the package nlohmann_json from conda-forge executing

    conda install -c conda-forge nlohmann_json\n
    Example

    1. Create the following file:

      example.cpp
      #include <nlohmann/json.hpp>\n#include <iostream>\n#include <iomanip>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    std::cout << std::setw(4) << json::meta() << std::endl;\n}\n

    2. Create and activate an anvironment \"json`:

      conda create -n json\nconda activate json\n

    3. Install the package:

      conda install -c conda-forge nlohmann_json\n

    4. Build the code:

      g++ -std=c++11 -I$(conda info --base)/envs/json/include example.cpp -o example\n
    "},{"location":"integration/package_managers/#msys2","title":"MSYS2","text":"

    If you are using MSYS2, you can use the mingw-w64-nlohmann-json package, type pacman -S mingw-w64-i686-nlohmann-json or pacman -S mingw-w64-x86_64-nlohmann-json for installation. Please file issues here if you experience problems with the packages.

    The package is updated automatically.

    "},{"location":"integration/package_managers/#macports","title":"MacPorts","text":"

    Summary

    port: nlohmann-json

    • Availalbe versions: current version
    • The port is updated with every release.
    • File issues at the MacPorts issue tracker
    • MacPorts website

    If you are using MacPorts, execute 

    sudo port install nlohmann-json\n

    to install the nlohmann-json package.

    Example: Raw compilation

    1. Create the following file:

      example.cpp
      #include <nlohmann/json.hpp>\n#include <iostream>\n#include <iomanip>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    std::cout << std::setw(4) << json::meta() << std::endl;\n}\n

    2. Install the package:

      sudo port install nlohmann-json\n

    3. Compile the code and pass the Homebrew prefix to the include path such that the library can be found:

      c++ example.cpp -I/opt/local/include -std=c++11 -o example\n
    Example: CMake

    1. Create the following files:

      example.cpp
      #include <nlohmann/json.hpp>\n#include <iostream>\n#include <iomanip>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    std::cout << std::setw(4) << json::meta() << std::endl;\n}\n
      CMakeLists.txt
      cmake_minimum_required(VERSION 3.15)\nproject(json_example)\n\nfind_package(nlohmann_json CONFIG REQUIRED)\n\nadd_executable(json_example example.cpp)\ntarget_link_libraries(json_example PRIVATE nlohmann_json::nlohmann_json)\n

    2. Install the package:

      sudo port install nlohmann-json\n

    3. Compile the code:

      cmake -S . -B build\ncmake --build build\n
    "},{"location":"integration/package_managers/#build2","title":"build2","text":"

    If you are using build2, you can use the nlohmann-json package from the public repository http://cppget.org or directly from the package's sources repository. In your project's manifest file, add depends: nlohmann-json (probably with some version constraints). If you are not familiar with using dependencies in build2, please read this introduction. Please file issues here if you experience problems with the packages.

    The package is updated automatically.

    bdep new -t exe -l c++\n
    "},{"location":"integration/package_managers/#cpmcmake","title":"CPM.cmake","text":"

    Summary

    package: gh:nlohmann/json

    • Availalbe versions: current and previous versions
    • The package is updated with every release.
    • File issues at the CPM.cmake issue tracker
    • CPM.cmake website

    If you are using CPM.cmake, add the CPM.cmake script and the following snippet to your CMake project:

    CPMAddPackage(\"gh:nlohmann/json@3.12.0\")\n
    Example

    1. Create the following files:

      example.cpp
      #include <nlohmann/json.hpp>\n#include <iostream>\n#include <iomanip>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    std::cout << std::setw(4) << json::meta() << std::endl;\n}\n
      CMakeLists.txt
      cmake_minimum_required(VERSION 3.15)\nproject(json_example)\n\ninclude(${CMAKE_SOURCE_DIR}/cmake/CPM.cmake)\n\nCPMAddPackage(\"gh:nlohmann/json@3.12.0\")\n\nadd_executable(json_example example.cpp)\ntarget_link_libraries(json_example PRIVATE nlohmann_json::nlohmann_json)\n

    2. Download CPM.cmake

      mkdir -p cmake\nwget -O cmake/CPM.cmake https://github.com/cpm-cmake/CPM.cmake/releases/latest/download/get_cpm.cmake\n

    3. Build

      cmake -S . -B build\ncmake --build build\n
    "},{"location":"integration/package_managers/#xmake","title":"xmake","text":"

    Summary

    package: nlohmann_json

    • Availalbe versions: current and previous versions
    • The package is updated with every release.
    • File issues at the xmake issue tracker
    • xmake website
    Example

    1. Create the following files:

      example.cpp
      #include <nlohmann/json.hpp>\n#include <iostream>\n#include <iomanip>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    std::cout << std::setw(4) << json::meta() << std::endl;\n}\n
      xmake.lua
      add_requires(\"nlohmann_json\")\n\nadd_rules(\"mode.debug\", \"mode.release\")\ntarget(\"xm\")\n    set_kind(\"binary\")\n    add_files(\"example.cpp\")\n    add_packages(\"nlohmann_json\")\n    set_languages(\"cxx11\")\n

    2. Build

      xmake\n

    3. Run

      xmake run\n
    "},{"location":"integration/package_managers/#other-package-managers","title":"Other package managers","text":"

    The library is also contained in many other package repositories:

    Package version overview

    "},{"location":"integration/package_managers/#buckaroo","title":"Buckaroo","text":"

    If you are using Buckaroo, you can install this library's module with buckaroo add github.com/buckaroo-pm/nlohmann-json. There is a demo repo here.

    Warning

    The module is outdated as the respective repository has not been updated in years.

    "},{"location":"integration/package_managers/#cocoapods","title":"CocoaPods","text":"

    If you are using CocoaPods, you can use the library by adding pod \"nlohmann_json\", '~>3.1.2' to your podfile (see an example). Please file issues here.

    Warning

    The module is outdated as the respective pod has not been updated in years.

    "},{"location":"integration/pkg-config/","title":"Pkg-config","text":"

    If you are using bare Makefiles, you can use pkg-config to generate the include flags that point to where the library is installed:

    pkg-config nlohmann_json --cflags\n

    Users of the Meson build system will also be able to use a system-wide library, which will be found by pkg-config:

    json = dependency('nlohmann_json', required: true)\n
    "}]} \ No newline at end of file +{"config":{"lang":["en"],"separator":"[\\s\\-\\.]","pipeline":["stopWordFilter"]},"docs":[{"location":"","title":"JSON for Modern C++","text":""},{"location":"api/json/","title":"nlohmann::json","text":"
    using json = basic_json<>;\n

    This type is the default specialization of the basic_json class which uses the standard template types.

    "},{"location":"api/json/#examples","title":"Examples","text":"Example

    The example below demonstrates how to use the type nlohmann::json.

    #include <iostream>\n#include <iomanip>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // create a JSON object\n    json j =\n    {\n        {\"pi\", 3.141},\n        {\"happy\", true},\n        {\"name\", \"Niels\"},\n        {\"nothing\", nullptr},\n        {\n            \"answer\", {\n                {\"everything\", 42}\n            }\n        },\n        {\"list\", {1, 0, 2}},\n        {\n            \"object\", {\n                {\"currency\", \"USD\"},\n                {\"value\", 42.99}\n            }\n        }\n    };\n\n    // add new values\n    j[\"new\"][\"key\"][\"value\"] = {\"another\", \"list\"};\n\n    // count elements\n    auto s = j.size();\n    j[\"size\"] = s;\n\n    // pretty print with indent of 4 spaces\n    std::cout << std::setw(4) << j << '\\n';\n}\n

    Output:

    {\n    \"answer\": {\n        \"everything\": 42\n    },\n    \"happy\": true,\n    \"list\": [\n        1,\n        0,\n        2\n    ],\n    \"name\": \"Niels\",\n    \"new\": {\n        \"key\": {\n            \"value\": [\n                \"another\",\n                \"list\"\n            ]\n        }\n    },\n    \"nothing\": null,\n    \"object\": {\n        \"currency\": \"USD\",\n        \"value\": 42.99\n    },\n    \"pi\": 3.141,\n    \"size\": 8\n}\n
    "},{"location":"api/json/#version-history","title":"Version history","text":"

    Since version 1.0.0.

    "},{"location":"api/operator_gtgt/","title":"nlohmann::operator>>(basic_json)","text":"
    std::istream& operator>>(std::istream& i, basic_json& j);\n

    Deserializes an input stream to a JSON value.

    "},{"location":"api/operator_gtgt/#parameters","title":"Parameters","text":"i (in, out) input stream to read a serialized JSON value from j (in, out) JSON value to write the deserialized input to"},{"location":"api/operator_gtgt/#return-value","title":"Return value","text":"

    the stream i

    "},{"location":"api/operator_gtgt/#exceptions","title":"Exceptions","text":"
    • Throws parse_error.101 in case of an unexpected token.
    • Throws parse_error.102 if to_unicode fails or surrogate error.
    • Throws parse_error.103 if to_unicode fails.
    "},{"location":"api/operator_gtgt/#complexity","title":"Complexity","text":"

    Linear in the length of the input. The parser is a predictive LL(1) parser.

    "},{"location":"api/operator_gtgt/#notes","title":"Notes","text":"

    A UTF-8 byte order mark is silently ignored.

    Deprecation

    This function replaces function std::istream& operator<<(basic_json& j, std::istream& i) which has been deprecated in version 3.0.0. It will be removed in version 4.0.0. Please replace calls like j << i; with i >> j;.

    "},{"location":"api/operator_gtgt/#examples","title":"Examples","text":"Example

    The example below shows how a JSON value is constructed by reading a serialization from a stream.

    #include <iostream>\n#include <iomanip>\n#include <sstream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // create stream with serialized JSON\n    std::stringstream ss;\n    ss << R\"({\n        \"number\": 23,\n        \"string\": \"Hello, world!\",\n        \"array\": [1, 2, 3, 4, 5],\n        \"boolean\": false,\n        \"null\": null\n    })\";\n\n    // create JSON value and read the serialization from the stream\n    json j;\n    ss >> j;\n\n    // serialize JSON\n    std::cout << std::setw(2) << j << '\\n';\n}\n

    Output:

    {\n  \"array\": [\n    1,\n    2,\n    3,\n    4,\n    5\n  ],\n  \"boolean\": false,\n  \"null\": null,\n  \"number\": 23,\n  \"string\": \"Hello, world!\"\n}\n
    "},{"location":"api/operator_gtgt/#see-also","title":"See also","text":"
    • accept - check if the input is valid JSON
    • parse - deserialize from a compatible input
    "},{"location":"api/operator_gtgt/#version-history","title":"Version history","text":"
    • Added in version 1.0.0. Deprecated in version 3.0.0.
    "},{"location":"api/operator_literal_json/","title":"nlohmann::operator\"\"_json","text":"
    json operator \"\"_json(const char* s, std::size_t n);\n

    This operator implements a user-defined string literal for JSON objects. It can be used by adding _json to a string literal and returns a json object if no parse error occurred.

    It is recommended to bring the operator into scope using any of the following lines: 

    using nlohmann::literals::operator \"\"_json;\nusing namespace nlohmann::literals;\nusing namespace nlohmann::json_literals;\nusing namespace nlohmann::literals::json_literals;\nusing namespace nlohmann;\n

    This is suggested to ease migration to the next major version release of the library. See JSON_USE_GLOBAL_UDLS for details.

    "},{"location":"api/operator_literal_json/#parameters","title":"Parameters","text":"s (in) a string representation of a JSON object n (in) length of string s"},{"location":"api/operator_literal_json/#return-value","title":"Return value","text":"

    json value parsed from s

    "},{"location":"api/operator_literal_json/#exceptions","title":"Exceptions","text":"

    The function can throw anything that parse(s, s+n) would throw.

    "},{"location":"api/operator_literal_json/#complexity","title":"Complexity","text":"

    Linear.

    "},{"location":"api/operator_literal_json/#examples","title":"Examples","text":"Example

    The following code shows how to create JSON values from string literals.

    #include <iostream>\n#include <iomanip>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\nusing namespace nlohmann::literals;\n\nint main()\n{\n    json j = R\"( {\"hello\": \"world\", \"answer\": 42} )\"_json;\n\n    std::cout << std::setw(2) << j << '\\n';\n}\n

    Output:

    {\n  \"answer\": 42,\n  \"hello\": \"world\"\n}\n
    "},{"location":"api/operator_literal_json/#version-history","title":"Version history","text":"
    • Added in version 1.0.0.
    • Moved to namespace nlohmann::literals::json_literals in 3.11.0.
    "},{"location":"api/operator_literal_json_pointer/","title":"nlohmann::operator\"\"_json_pointer","text":"
    json_pointer operator \"\"_json_pointer(const char* s, std::size_t n);\n

    This operator implements a user-defined string literal for JSON Pointers. It can be used by adding _json_pointer to a string literal and returns a json_pointer object if no parse error occurred.

    It is recommended to bring the operator into scope using any of the following lines: 

    using nlohmann::literals::operator \"\"_json_pointer;\nusing namespace nlohmann::literals;\nusing namespace nlohmann::json_literals;\nusing namespace nlohmann::literals::json_literals;\nusing namespace nlohmann;\n
    This is suggested to ease migration to the next major version release of the library. See JSON_USE_GLOBAL_UDLS for details.

    "},{"location":"api/operator_literal_json_pointer/#parameters","title":"Parameters","text":"s (in) a string representation of a JSON Pointer n (in) length of string s"},{"location":"api/operator_literal_json_pointer/#return-value","title":"Return value","text":"

    json_pointer value parsed from s

    "},{"location":"api/operator_literal_json_pointer/#exceptions","title":"Exceptions","text":"

    The function can throw anything that json_pointer::json_pointer would throw.

    "},{"location":"api/operator_literal_json_pointer/#complexity","title":"Complexity","text":"

    Linear.

    "},{"location":"api/operator_literal_json_pointer/#examples","title":"Examples","text":"Example

    The following code shows how to create JSON Pointers from string literals.

    #include <iostream>\n#include <iomanip>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\nusing namespace nlohmann::literals;\n\nint main()\n{\n    json j = R\"( {\"hello\": \"world\", \"answer\": 42} )\"_json;\n    auto val = j[\"/hello\"_json_pointer];\n\n    std::cout << std::setw(2) << val << '\\n';\n}\n

    Output:

    \"world\"\n
    "},{"location":"api/operator_literal_json_pointer/#see-also","title":"See also","text":"
    • json_pointer - type to represent JSON Pointers
    "},{"location":"api/operator_literal_json_pointer/#version-history","title":"Version history","text":"
    • Added in version 2.0.0.
    • Moved to namespace nlohmann::literals::json_literals in 3.11.0.
    "},{"location":"api/operator_ltlt/","title":"nlohmann::operator<<(basic_json), nlohmann::operator<<(json_pointer)","text":"
    std::ostream& operator<<(std::ostream& o, const basic_json& j);      // (1)\n\nstd::ostream& operator<<(std::ostream& o, const json_pointer& ptr);  // (2)\n
    1. Serialize the given JSON value j to the output stream o. The JSON value will be serialized using the dump member function.
      • The indentation of the output can be controlled with the member variable width of the output stream o. For instance, using the manipulator std::setw(4) on o sets the indentation level to 4 and the serialization result is the same as calling dump(4).
      • The indentation character can be controlled with the member variable fill of the output stream o. For instance, the manipulator std::setfill('\\\\t') sets indentation to use a tab character rather than the default space character.
    2. Write a string representation of the given JSON pointer ptr to the output stream o. The string representation is obtained using the to_string member function.
    "},{"location":"api/operator_ltlt/#parameters","title":"Parameters","text":"o (in, out) stream to write to j (in) JSON value to serialize ptr (in) JSON pointer to write"},{"location":"api/operator_ltlt/#return-value","title":"Return value","text":"

    the stream o

    "},{"location":"api/operator_ltlt/#exceptions","title":"Exceptions","text":"
    1. Throws type_error.316 if a string stored inside the JSON value is not UTF-8 encoded. Note that unlike the dump member functions, no error_handler can be set.
    2. None.
    "},{"location":"api/operator_ltlt/#complexity","title":"Complexity","text":"

    Linear.

    "},{"location":"api/operator_ltlt/#notes","title":"Notes","text":"

    Deprecation

    Function std::ostream& operator<<(std::ostream& o, const basic_json& j) replaces function std::ostream& operator>>(const basic_json& j, std::ostream& o) which has been deprecated in version 3.0.0. It will be removed in version 4.0.0. Please replace calls like j >> o; with o << j;.

    "},{"location":"api/operator_ltlt/#examples","title":"Examples","text":"Example: (1) serialize JSON value to stream

    The example below shows the serialization with different parameters to width to adjust the indentation level.

    #include <iostream>\n#include <iomanip>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // create JSON values\n    json j_object = {{\"one\", 1}, {\"two\", 2}};\n    json j_array = {1, 2, 4, 8, 16};\n\n    // serialize without indentation\n    std::cout << j_object << \"\\n\\n\";\n    std::cout << j_array << \"\\n\\n\";\n\n    // serialize with indentation\n    std::cout << std::setw(4) << j_object << \"\\n\\n\";\n    std::cout << std::setw(2) << j_array << \"\\n\\n\";\n    std::cout << std::setw(1) << std::setfill('\\t') << j_object << \"\\n\\n\";\n}\n

    Output:

    {\"one\":1,\"two\":2}\n\n[1,2,4,8,16]\n\n{\n    \"one\": 1,\n    \"two\": 2\n}\n\n[\n  1,\n  2,\n  4,\n  8,\n  16\n]\n\n{\n    \"one\": 1,\n    \"two\": 2\n}\n
    Example: (2) write JSON pointer to stream

    The example below shows how to write a JSON pointer to a stream.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // create JSON poiner\n    json::json_pointer ptr(\"/foo/bar/baz\");\n\n    // write string representation to stream\n    std::cout << ptr << std::endl;\n}\n

    Output:

    /foo/bar/baz\n
    "},{"location":"api/operator_ltlt/#version-history","title":"Version history","text":"
    1. Added in version 1.0.0. Added support for indentation character and deprecated std::ostream& operator>>(const basic_json& j, std::ostream& o) in version 3.0.0.
    2. Added in version 3.11.0.
    "},{"location":"api/ordered_json/","title":"nlohmann::ordered_json","text":"
    using ordered_json = basic_json<ordered_map>;\n

    This type preserves the insertion order of object keys.

    "},{"location":"api/ordered_json/#iterator-invalidation","title":"Iterator invalidation","text":"

    The type is based on ordered_map which in turn uses a std::vector to store object elements. Therefore, adding object elements can yield a reallocation in which case all iterators (including the end() iterator) and all references to the elements are invalidated. Also, any iterator or reference after the insertion point will point to the same index, which is now a different value.

    "},{"location":"api/ordered_json/#examples","title":"Examples","text":"Example

    The example below demonstrates how ordered_json preserves the insertion order of object keys.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing ordered_json = nlohmann::ordered_json;\n\nint main()\n{\n    ordered_json j;\n    j[\"one\"] = 1;\n    j[\"two\"] = 2;\n    j[\"three\"] = 3;\n\n    std::cout << j.dump(2) << '\\n';\n}\n

    Output:

    {\n  \"one\": 1,\n  \"two\": 2,\n  \"three\": 3\n}\n
    "},{"location":"api/ordered_json/#see-also","title":"See also","text":"
    • ordered_map
    • Object Order
    "},{"location":"api/ordered_json/#version-history","title":"Version history","text":"

    Since version 3.9.0.

    "},{"location":"api/ordered_map/","title":"nlohmann::ordered_map","text":"
    template<class Key, class T, class IgnoredLess = std::less<Key>,\n         class Allocator = std::allocator<std::pair<const Key, T>>>\nstruct ordered_map : std::vector<std::pair<const Key, T>, Allocator>;\n

    A minimal map-like container that preserves insertion order for use within nlohmann::ordered_json (nlohmann::basic_json<ordered_map>).

    "},{"location":"api/ordered_map/#template-parameters","title":"Template parameters","text":"Key key type T mapped type IgnoredLess comparison function (ignored and only added to ensure compatibility with std::map) Allocator allocator type"},{"location":"api/ordered_map/#iterator-invalidation","title":"Iterator invalidation","text":"

    The type uses a std::vector to store object elements. Therefore, adding elements can yield a reallocation in which case all iterators (including the end() iterator) and all references to the elements are invalidated.

    "},{"location":"api/ordered_map/#member-types","title":"Member types","text":"
    • key_type - key type (Key)
    • mapped_type - mapped type (T)
    • Container - base container type (std::vector<std::pair<const Key, T>, Allocator>)
    • iterator
    • const_iterator
    • size_type
    • value_type
    • key_compare - key comparison function 
      std::equal_to<Key>  // until C++14\n\nstd::equal_to<>     // since C++14\n
    "},{"location":"api/ordered_map/#member-functions","title":"Member functions","text":"
    • (constructor)
    • (destructor)
    • emplace
    • operator[]
    • at
    • erase
    • count
    • find
    • insert
    "},{"location":"api/ordered_map/#examples","title":"Examples","text":"Example

    The example shows the different behavior of std::map and nlohmann::ordered_map.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\n// simple output function\ntemplate<typename Map>\nvoid output(const char* prefix, const Map& m)\n{\n    std::cout << prefix << \" = { \";\n    for (auto& element : m)\n    {\n        std::cout << element.first << \":\" << element.second << ' ';\n    }\n    std::cout << \"}\" << std::endl;\n}\n\nint main()\n{\n    // create and fill two maps\n    nlohmann::ordered_map<std::string, std::string> m_ordered;\n    m_ordered[\"one\"] = \"eins\";\n    m_ordered[\"two\"] = \"zwei\";\n    m_ordered[\"three\"] = \"drei\";\n\n    std::map<std::string, std::string> m_std;\n    m_std[\"one\"] = \"eins\";\n    m_std[\"two\"] = \"zwei\";\n    m_std[\"three\"] = \"drei\";\n\n    // output: m_ordered is ordered by insertion order, m_std is ordered by key\n    output(\"m_ordered\", m_ordered);\n    output(\"m_std\", m_std);\n\n    // erase and re-add \"one\" key\n    m_ordered.erase(\"one\");\n    m_ordered[\"one\"] = \"eins\";\n\n    m_std.erase(\"one\");\n    m_std[\"one\"] = \"eins\";\n\n    // output: m_ordered shows newly added key at the end; m_std is again ordered by key\n    output(\"m_ordered\", m_ordered);\n    output(\"m_std\", m_std);\n}\n

    Output:

    m_ordered = { one:eins two:zwei three:drei }\nm_std = { one:eins three:drei two:zwei }\nm_ordered = { two:zwei three:drei one:eins }\nm_std = { one:eins three:drei two:zwei }\n
    "},{"location":"api/ordered_map/#see-also","title":"See also","text":"
    • ordered_json
    "},{"location":"api/ordered_map/#version-history","title":"Version history","text":"
    • Added in version 3.9.0 to implement nlohmann::ordered_json.
    • Added key_compare member in version 3.11.0.
    "},{"location":"api/adl_serializer/","title":"nlohmann::adl_serializer","text":"
    template<typename, typename>\nstruct adl_serializer;\n

    Serializer that uses ADL (Argument-Dependent Lookup) to choose to_json/from_json functions from the types' namespaces.

    It is implemented similarly to

    template<typename ValueType>\nstruct adl_serializer {\n    template<typename BasicJsonType>\n    static void to_json(BasicJsonType& j, const T& value) {\n        // calls the \"to_json\" method in T's namespace\n    }\n\n    template<typename BasicJsonType>\n    static void from_json(const BasicJsonType& j, T& value) {\n        // same thing, but with the \"from_json\" method\n    }\n};\n
    "},{"location":"api/adl_serializer/#member-functions","title":"Member functions","text":"
    • from_json - convert a JSON value to any value type
    • to_json - convert any value type to a JSON value
    "},{"location":"api/adl_serializer/#version-history","title":"Version history","text":"
    • Added in version 2.1.0.
    "},{"location":"api/adl_serializer/from_json/","title":"nlohmann::adl_serializer::from_json","text":"
    // (1)\ntemplate<typename BasicJsonType, typename TargetType = ValueType>\nstatic auto from_json(BasicJsonType && j, TargetType& val) noexcept(\n    noexcept(::nlohmann::from_json(std::forward<BasicJsonType>(j), val)))\n-> decltype(::nlohmann::from_json(std::forward<BasicJsonType>(j), val), void())\n\n// (2)\ntemplate<typename BasicJsonType, typename TargetType = ValueType>\nstatic auto from_json(BasicJsonType && j) noexcept(\nnoexcept(::nlohmann::from_json(std::forward<BasicJsonType>(j), detail::identity_tag<TargetType> {})))\n-> decltype(::nlohmann::from_json(std::forward<BasicJsonType>(j), detail::identity_tag<TargetType> {}))\n

    This function is usually called by the get() function of the basic_json class (either explicitly or via the conversion operators).

    1. This function is chosen for default-constructible value types.
    2. This function is chosen for value types which are not default-constructible.
    "},{"location":"api/adl_serializer/from_json/#parameters","title":"Parameters","text":"j (in) JSON value to read from val (out) value to write to"},{"location":"api/adl_serializer/from_json/#return-value","title":"Return value","text":"

    Copy of the JSON value, converted to ValueType

    "},{"location":"api/adl_serializer/from_json/#examples","title":"Examples","text":"Example: (1) Default-constructible type

    The example below shows how a from_json function can be implemented for a user-defined type. This function is called by the adl_serializer when template get<ns::person>() is called.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nnamespace ns\n{\n// a simple struct to model a person\nstruct person\n{\n    std::string name;\n    std::string address;\n    int age;\n};\n} // namespace ns\n\nnamespace ns\n{\nvoid from_json(const json& j, person& p)\n{\n    j.at(\"name\").get_to(p.name);\n    j.at(\"address\").get_to(p.address);\n    j.at(\"age\").get_to(p.age);\n}\n} // namespace ns\n\nint main()\n{\n    json j;\n    j[\"name\"] = \"Ned Flanders\";\n    j[\"address\"] = \"744 Evergreen Terrace\";\n    j[\"age\"] = 60;\n\n    auto p = j.template get<ns::person>();\n\n    std::cout << p.name << \" (\" << p.age << \") lives in \" << p.address << std::endl;\n}\n

    Output:

    Ned Flanders (60) lives in 744 Evergreen Terrace\n
    Example: (2) Non-default-constructible type

    The example below shows how a from_json is implemented as part of a specialization of the adl_serializer to realize the conversion of a non-default-constructible type.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nnamespace ns\n{\n// a simple struct to model a person (not default constructible)\nstruct person\n{\n    person(std::string n, std::string a, int aa)\n        : name(std::move(n)), address(std::move(a)), age(aa)\n    {}\n\n    std::string name;\n    std::string address;\n    int age;\n};\n} // namespace ns\n\nnamespace nlohmann\n{\ntemplate <>\nstruct adl_serializer<ns::person>\n{\n    static ns::person from_json(const json& j)\n    {\n        return {j.at(\"name\"), j.at(\"address\"), j.at(\"age\")};\n    }\n\n    // Here's the catch! You must provide a to_json method! Otherwise, you\n    // will not be able to convert person to json, since you fully\n    // specialized adl_serializer on that type\n    static void to_json(json& j, ns::person p)\n    {\n        j[\"name\"] = p.name;\n        j[\"address\"] = p.address;\n        j[\"age\"] = p.age;\n    }\n};\n} // namespace nlohmann\n\nint main()\n{\n    json j;\n    j[\"name\"] = \"Ned Flanders\";\n    j[\"address\"] = \"744 Evergreen Terrace\";\n    j[\"age\"] = 60;\n\n    auto p = j.template get<ns::person>();\n\n    std::cout << p.name << \" (\" << p.age << \") lives in \" << p.address << std::endl;\n}\n

    Output:

    Ned Flanders (60) lives in 744 Evergreen Terrace\n
    "},{"location":"api/adl_serializer/from_json/#see-also","title":"See also","text":"
    • to_json
    "},{"location":"api/adl_serializer/from_json/#version-history","title":"Version history","text":"
    • Added in version 2.1.0.
    "},{"location":"api/adl_serializer/to_json/","title":"nlohmann::adl_serializer::to_json","text":"
    template<typename BasicJsonType, typename TargetType = ValueType>\nstatic auto to_json(BasicJsonType& j, TargetType && val) noexcept(\n    noexcept(::nlohmann::to_json(j, std::forward<TargetType>(val))))\n-> decltype(::nlohmann::to_json(j, std::forward<TargetType>(val)), void())\n

    This function is usually called by the constructors of the basic_json class.

    "},{"location":"api/adl_serializer/to_json/#parameters","title":"Parameters","text":"j (out) JSON value to write to val (in) value to read from"},{"location":"api/adl_serializer/to_json/#examples","title":"Examples","text":"Example

    The example below shows how a to_json function can be implemented for a user-defined type. This function is called by the adl_serializer when the constructor basic_json(ns::person) is called.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nnamespace ns\n{\n// a simple struct to model a person\nstruct person\n{\n    std::string name;\n    std::string address;\n    int age;\n};\n} // namespace ns\n\nnamespace ns\n{\nvoid to_json(json& j, const person& p)\n{\n    j = json{ {\"name\", p.name}, {\"address\", p.address}, {\"age\", p.age} };\n}\n} // namespace ns\n\nint main()\n{\n    ns::person p = {\"Ned Flanders\", \"744 Evergreen Terrace\", 60};\n\n    json j = p;\n\n    std::cout << j << std::endl;\n}\n

    Output:

    {\"address\":\"744 Evergreen Terrace\",\"age\":60,\"name\":\"Ned Flanders\"}\n
    "},{"location":"api/adl_serializer/to_json/#see-also","title":"See also","text":"
    • from_json
    "},{"location":"api/adl_serializer/to_json/#version-history","title":"Version history","text":"
    • Added in version 2.1.0.
    "},{"location":"api/basic_json/","title":"nlohmann::basic_json","text":"

    Defined in header <nlohmann/json.hpp>

    template<\n    template<typename U, typename V, typename... Args> class ObjectType = std::map,\n    template<typename U, typename... Args> class ArrayType = std::vector,\n    class StringType = std::string,\n    class BooleanType = bool,\n    class NumberIntegerType = std::int64_t,\n    class NumberUnsignedType = std::uint64_t,\n    class NumberFloatType = double,\n    template<typename U> class AllocatorType = std::allocator,\n    template<typename T, typename SFINAE = void> class JSONSerializer = adl_serializer,\n    class BinaryType = std::vector<std::uint8_t>,\n    class CustomBaseClass = void\n>\nclass basic_json;\n
    "},{"location":"api/basic_json/#template-parameters","title":"Template parameters","text":"Template parameter Description Derived type ObjectType type for JSON objects object_t ArrayType type for JSON arrays array_t StringType type for JSON strings and object keys string_t BooleanType type for JSON booleans boolean_t NumberIntegerType type for JSON integer numbers number_integer_t NumberUnsignedType type for JSON unsigned integer numbers number_unsigned_t NumberFloatType type for JSON floating-point numbers number_float_t AllocatorType type of the allocator to use JSONSerializer the serializer to resolve internal calls to to_json() and from_json() json_serializer BinaryType type for binary arrays binary_t CustomBaseClass extension point for user code json_base_class_t"},{"location":"api/basic_json/#specializations","title":"Specializations","text":"
    • json - default specialization
    • ordered_json - a specialization that maintains the insertion order of object keys
    "},{"location":"api/basic_json/#iterator-invalidation","title":"Iterator invalidation","text":"

    All operations that add values to an array (push_back , operator+=, emplace_back, insert, and operator[] for a non-existing index) can yield a reallocation, in which case all iterators (including the end() iterator) and all references to the elements are invalidated.

    For ordered_json, also all operations that add a value to an object (push_back, operator+=, emplace, insert, update, and operator[] for a non-existing key) can yield a reallocation, in which case all iterators (including the end() iterator) and all references to the elements are invalidated.

    "},{"location":"api/basic_json/#requirements","title":"Requirements","text":"

    The class satisfies the following concept requirements:

    "},{"location":"api/basic_json/#basic","title":"Basic","text":"
    • DefaultConstructible: JSON values can be default-constructed. The result will be a JSON null value.
    • MoveConstructible: A JSON value can be constructed from an rvalue argument.
    • CopyConstructible: A JSON value can be copy-constructed from an lvalue expression.
    • MoveAssignable: A JSON value can be assigned from an rvalue argument.
    • CopyAssignable: A JSON value can be copy-assigned from an lvalue expression.
    • Destructible: JSON values can be destructed.
    "},{"location":"api/basic_json/#layout","title":"Layout","text":"
    • StandardLayoutType: JSON values have standard layout: All non-static data members are private and standard layout types, the class has no virtual functions or (virtual) base classes.
    "},{"location":"api/basic_json/#library-wide","title":"Library-wide","text":"
    • EqualityComparable: JSON values can be compared with ==, see operator==.
    • LessThanComparable: JSON values can be compared with <, see operator<.
    • Swappable: Any JSON lvalue or rvalue of can be swapped with any lvalue or rvalue of other compatible types, using unqualified function swap.
    • NullablePointer: JSON values can be compared against std::nullptr_t objects which are used to model the null value.
    "},{"location":"api/basic_json/#container","title":"Container","text":"
    • Container: JSON values can be used like STL containers and provide iterator access.
    • ReversibleContainer: JSON values can be used like STL containers and provide reverse iterator access.
    "},{"location":"api/basic_json/#member-types","title":"Member types","text":"
    • adl_serializer - the default serializer
    • value_t - the JSON type enumeration
    • json_pointer - JSON Pointer implementation
    • json_serializer - type of the serializer to for conversions from/to JSON
    • error_handler_t - type to choose behavior on decoding errors
    • cbor_tag_handler_t - type to choose how to handle CBOR tags
    • initializer_list_t - type for initializer lists of basic_json values
    • input_format_t - type to choose the format to parse
    • json_sax_t - type for SAX events
    "},{"location":"api/basic_json/#exceptions","title":"Exceptions","text":"
    • exception - general exception of the basic_json class
      • parse_error - exception indicating a parse error
      • invalid_iterator - exception indicating errors with iterators
      • type_error - exception indicating executing a member function with a wrong type
      • out_of_range - exception indicating access out of the defined range
      • other_error - exception indicating other library errors
    "},{"location":"api/basic_json/#container-types","title":"Container types","text":"Type Definition value_type basic_json reference value_type& const_reference const value_type& difference_type std::ptrdiff_t size_type std::size_t allocator_type AllocatorType<basic_json> pointer std::allocator_traits<allocator_type>::pointer const_pointer std::allocator_traits<allocator_type>::const_pointer iterator LegacyBidirectionalIterator const_iterator constant LegacyBidirectionalIterator reverse_iterator reverse iterator, derived from iterator const_reverse_iterator reverse iterator, derived from const_iterator iteration_proxy helper type for items function"},{"location":"api/basic_json/#json-value-data-types","title":"JSON value data types","text":"
    • array_t - type for arrays
    • binary_t - type for binary arrays
    • boolean_t - type for booleans
    • default_object_comparator_t - default comparator for objects
    • number_float_t - type for numbers (floating-point)
    • number_integer_t - type for numbers (integer)
    • number_unsigned_t - type for numbers (unsigned)
    • object_comparator_t - comparator for objects
    • object_t - type for objects
    • string_t - type for strings
    "},{"location":"api/basic_json/#parser-callback","title":"Parser callback","text":"
    • parse_event_t - parser event types
    • parser_callback_t - per-element parser callback type
    "},{"location":"api/basic_json/#member-functions","title":"Member functions","text":"
    • (constructor)
    • (destructor)
    • operator= - copy assignment
    • array (static) - explicitly create an array
    • binary (static) - explicitly create a binary array
    • object (static) - explicitly create an object
    "},{"location":"api/basic_json/#object-inspection","title":"Object inspection","text":"

    Functions to inspect the type of a JSON value.

    • type - return the type of the JSON value
    • operator value_t - return the type of the JSON value
    • type_name - return the type as string
    • is_primitive - return whether the type is primitive
    • is_structured - return whether the type is structured
    • is_null - return whether the value is null
    • is_boolean - return whether the value is a boolean
    • is_number - return whether the value is a number
    • is_number_integer - return whether the value is an integer number
    • is_number_unsigned - return whether the value is an unsigned integer number
    • is_number_float - return whether the value is a floating-point number
    • is_object - return whether the value is an object
    • is_array - return whether the value is an array
    • is_string - return whether the value is a string
    • is_binary - return whether the value is a binary array
    • is_discarded - return whether the value is discarded

    Optional functions to access the diagnostic positions.

    • start_pos - return the start position of the value
    • end_pos - return the one past the end position of the value
    "},{"location":"api/basic_json/#value-access","title":"Value access","text":"

    Direct access to the stored value of a JSON value.

    • get - get a value
    • get_to - get a value and write it to a destination
    • get_ptr - get a pointer value
    • get_ref - get a reference value
    • operator ValueType - get a value
    • get_binary - get a binary value
    "},{"location":"api/basic_json/#element-access","title":"Element access","text":"

    Access to the JSON value

    • at - access specified element with bounds checking
    • operator[] - access specified element
    • value - access specified object element with default value
    • front - access the first element
    • back - access the last element
    "},{"location":"api/basic_json/#lookup","title":"Lookup","text":"
    • find - find an element in a JSON object
    • count - returns the number of occurrences of a key in a JSON object
    • contains - check the existence of an element in a JSON object
    "},{"location":"api/basic_json/#iterators","title":"Iterators","text":"
    • begin - returns an iterator to the first element
    • cbegin - returns a const iterator to the first element
    • end - returns an iterator to one past the last element
    • cend - returns a const iterator to one past the last element
    • rbegin - returns an iterator to the reverse-beginning
    • rend - returns an iterator to the reverse-end
    • crbegin - returns a const iterator to the reverse-beginning
    • crend - returns a const iterator to the reverse-end
    • items - wrapper to access iterator member functions in range-based for
    "},{"location":"api/basic_json/#capacity","title":"Capacity","text":"
    • empty - checks whether the container is empty
    • size - returns the number of elements
    • max_size - returns the maximum possible number of elements
    "},{"location":"api/basic_json/#modifiers","title":"Modifiers","text":"
    • clear - clears the contents
    • push_back - add a value to an array/object
    • operator+= - add a value to an array/object
    • emplace_back - add a value to an array
    • emplace - add a value to an object if a key does not exist
    • erase - remove elements
    • insert - inserts elements
    • update - updates a JSON object from another object, overwriting existing keys
    • swap - exchanges the values
    "},{"location":"api/basic_json/#lexicographical-comparison-operators","title":"Lexicographical comparison operators","text":"
    • operator== - comparison: equal
    • operator!= - comparison: not equal
    • operator< - comparison: less than
    • operator> - comparison: greater than
    • operator<= - comparison: less than or equal
    • operator>= - comparison: greater than or equal
    • operator<=> - comparison: 3-way
    "},{"location":"api/basic_json/#serialization-dumping","title":"Serialization / Dumping","text":"
    • dump - serialization
    "},{"location":"api/basic_json/#deserialization-parsing","title":"Deserialization / Parsing","text":"
    • parse (static) - deserialize from a compatible input
    • accept (static) - check if the input is valid JSON
    • sax_parse (static) - generate SAX events
    "},{"location":"api/basic_json/#json-pointer-functions","title":"JSON Pointer functions","text":"
    • flatten - return flattened JSON value
    • unflatten - unflatten a previously flattened JSON value
    "},{"location":"api/basic_json/#json-patch-functions","title":"JSON Patch functions","text":"
    • patch - applies a JSON patch
    • patch_inplace - applies a JSON patch in place
    • diff (static) - creates a diff as a JSON patch
    "},{"location":"api/basic_json/#json-merge-patch-functions","title":"JSON Merge Patch functions","text":"
    • merge_patch - applies a JSON Merge Patch
    "},{"location":"api/basic_json/#static-functions","title":"Static functions","text":"
    • meta - returns version information on the library
    • get_allocator - returns the allocator associated with the container
    "},{"location":"api/basic_json/#binary-formats","title":"Binary formats","text":"
    • from_bjdata (static) - create a JSON value from an input in BJData format
    • from_bson (static) - create a JSON value from an input in BSON format
    • from_cbor (static) - create a JSON value from an input in CBOR format
    • from_msgpack (static) - create a JSON value from an input in MessagePack format
    • from_ubjson (static) - create a JSON value from an input in UBJSON format
    • to_bjdata (static) - create a BJData serialization of a given JSON value
    • to_bson (static) - create a BSON serialization of a given JSON value
    • to_cbor (static) - create a CBOR serialization of a given JSON value
    • to_msgpack (static) - create a MessagePack serialization of a given JSON value
    • to_ubjson (static) - create a UBJSON serialization of a given JSON value
    "},{"location":"api/basic_json/#non-member-functions","title":"Non-member functions","text":"
    • operator<<(std::ostream&) - serialize to stream
    • operator>>(std::istream&) - deserialize from stream
    • to_string - user-defined to_string function for JSON values
    "},{"location":"api/basic_json/#literals","title":"Literals","text":"
    • operator\"\"_json - user-defined string literal for JSON values
    "},{"location":"api/basic_json/#helper-classes","title":"Helper classes","text":"
    • std::hash<basic_json> - return a hash value for a JSON object
    • std::swap<basic_json> - exchanges the values of two JSON objects
    "},{"location":"api/basic_json/#examples","title":"Examples","text":"Example

    The example shows how the library is used.

    #include <iostream>\n#include <iomanip>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // create a JSON object\n    json j =\n    {\n        {\"pi\", 3.141},\n        {\"happy\", true},\n        {\"name\", \"Niels\"},\n        {\"nothing\", nullptr},\n        {\n            \"answer\", {\n                {\"everything\", 42}\n            }\n        },\n        {\"list\", {1, 0, 2}},\n        {\n            \"object\", {\n                {\"currency\", \"USD\"},\n                {\"value\", 42.99}\n            }\n        }\n    };\n\n    // add new values\n    j[\"new\"][\"key\"][\"value\"] = {\"another\", \"list\"};\n\n    // count elements\n    auto s = j.size();\n    j[\"size\"] = s;\n\n    // pretty print with indent of 4 spaces\n    std::cout << std::setw(4) << j << '\\n';\n}\n

    Output:

    {\n    \"answer\": {\n        \"everything\": 42\n    },\n    \"happy\": true,\n    \"list\": [\n        1,\n        0,\n        2\n    ],\n    \"name\": \"Niels\",\n    \"new\": {\n        \"key\": {\n            \"value\": [\n                \"another\",\n                \"list\"\n            ]\n        }\n    },\n    \"nothing\": null,\n    \"object\": {\n        \"currency\": \"USD\",\n        \"value\": 42.99\n    },\n    \"pi\": 3.141,\n    \"size\": 8\n}\n
    "},{"location":"api/basic_json/#see-also","title":"See also","text":"
    • RFC 8259: The JavaScript Object Notation (JSON) Data Interchange Format
    "},{"location":"api/basic_json/#version-history","title":"Version history","text":"
    • Added in version 1.0.0.
    "},{"location":"api/basic_json/accept/","title":"nlohmann::basic_json::accept","text":"
    // (1)\ntemplate<typename InputType>\nstatic bool accept(InputType&& i,\n                   const bool ignore_comments = false,\n                   const bool ignore_trailing_commas = false);\n\n// (2)\ntemplate<typename IteratorType>\nstatic bool accept(IteratorType first, IteratorType last,\n                   const bool ignore_comments = false,\n                   const bool ignore_trailing_commas = false);\n

    Checks whether the input is valid JSON.

    1. Reads from a compatible input.

    2. Reads from a pair of character iterators

      The value_type of the iterator must be an integral type with a size of 1, 2, or 4 bytes, which will be interpreted respectively as UTF-8, UTF-16, and UTF-32.

    Unlike the parse() function, this function neither throws an exception in case of invalid JSON input (i.e., a parse error) nor creates diagnostic information.

    "},{"location":"api/basic_json/accept/#template-parameters","title":"Template parameters","text":"InputType

    A compatible input, for instance:

    • an std::istream object
    • a FILE pointer (throws if null)
    • a C-style array of characters
    • a pointer to a null-terminated string of single byte characters (throws if null)
    • a std::string
    • an object obj for which begin(obj) and end(obj) produces a valid pair of iterators.
    IteratorType

    a compatible iterator type, for instance.

    • a pair of std::string::iterator or std::vector<std::uint8_t>::iterator
    • a pair of pointers such as ptr and ptr + len
    "},{"location":"api/basic_json/accept/#parameters","title":"Parameters","text":"i (in) Input to parse from. ignore_comments (in) whether comments should be ignored and treated like whitespace (true) or yield a parse error (false); (optional, false by default) ignore_trailing_commas (in) whether trailing commas in arrays or objects should be ignored and treated like whitespace (true) or yield a parse error (false); (optional, false by default) first (in) iterator to the start of the character range last (in) iterator to the end of the character range"},{"location":"api/basic_json/accept/#return-value","title":"Return value","text":"

    Whether the input is valid JSON.

    "},{"location":"api/basic_json/accept/#exception-safety","title":"Exception safety","text":"

    Strong guarantee: if an exception is thrown, there are no changes in the JSON value.

    "},{"location":"api/basic_json/accept/#exceptions","title":"Exceptions","text":"

    Throws parse_error.101 in case of an empty input like a null FILE* or char* pointer.

    "},{"location":"api/basic_json/accept/#complexity","title":"Complexity","text":"

    Linear in the length of the input. The parser is a predictive LL(1) parser.

    "},{"location":"api/basic_json/accept/#notes","title":"Notes","text":"

    A UTF-8 byte order mark is silently ignored.

    "},{"location":"api/basic_json/accept/#examples","title":"Examples","text":"Example

    The example below demonstrates the accept() function reading from a string.

    #include <iostream>\n#include <iomanip>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // a valid JSON text\n    auto valid_text = R\"(\n    {\n        \"numbers\": [1, 2, 3]\n    }\n    )\";\n\n    // an invalid JSON text\n    auto invalid_text = R\"(\n    {\n        \"strings\": [\"extra\", \"comma\", ]\n    }\n    )\";\n\n    std::cout << std::boolalpha\n              << json::accept(valid_text) << ' '\n              << json::accept(invalid_text) << '\\n';\n}\n

    Output:

    true false\n
    "},{"location":"api/basic_json/accept/#see-also","title":"See also","text":"
    • parse - deserialize from a compatible input
    • operator>> - deserialize from stream
    "},{"location":"api/basic_json/accept/#version-history","title":"Version history","text":"
    • Added in version 3.0.0.
    • Ignoring comments via ignore_comments added in version 3.9.0.
    • Changed runtime assertion in case of FILE* null pointers to exception in version 3.12.0.
    • Added ignore_trailing_commas in version 3.12.1.

    Deprecation

    Overload (2) replaces calls to accept with a pair of iterators as their first parameter which has been deprecated in version 3.8.0. This overload will be removed in version 4.0.0. Please replace all calls like accept({ptr, ptr+len}, ...); with accept(ptr, ptr+len, ...);.

    You should be warned by your compiler with a -Wdeprecated-declarations warning if you are using a deprecated function.

    "},{"location":"api/basic_json/array/","title":"nlohmann::basic_json::array","text":"
    static basic_json array(initializer_list_t init = {});\n

    Creates a JSON array value from a given initializer list. That is, given a list of values a, b, c, creates the JSON value [a, b, c]. If the initializer list is empty, the empty array [] is created.

    "},{"location":"api/basic_json/array/#parameters","title":"Parameters","text":"init (in) initializer list with JSON values to create an array from (optional)"},{"location":"api/basic_json/array/#return-value","title":"Return value","text":"

    JSON array value

    "},{"location":"api/basic_json/array/#exception-safety","title":"Exception safety","text":"

    Strong guarantee: if an exception is thrown, there are no changes in the JSON value.

    "},{"location":"api/basic_json/array/#complexity","title":"Complexity","text":"

    Linear in the size of init.

    "},{"location":"api/basic_json/array/#notes","title":"Notes","text":"

    This function is only needed to express two edge cases that cannot be realized with the initializer list constructor (basic_json(initializer_list_t, bool, value_t)). These cases are:

    1. creating an array whose elements are all pairs whose first element is a string -- in this case, the initializer list constructor would create an object, taking the first elements as keys
    2. creating an empty array -- passing the empty initializer list to the initializer list constructor yields an empty object
    "},{"location":"api/basic_json/array/#examples","title":"Examples","text":"Example

    The following code shows an example for the array function.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // create JSON arrays\n    json j_no_init_list = json::array();\n    json j_empty_init_list = json::array({});\n    json j_nonempty_init_list = json::array({1, 2, 3, 4});\n    json j_list_of_pairs = json::array({ {\"one\", 1}, {\"two\", 2} });\n\n    // serialize the JSON arrays\n    std::cout << j_no_init_list << '\\n';\n    std::cout << j_empty_init_list << '\\n';\n    std::cout << j_nonempty_init_list << '\\n';\n    std::cout << j_list_of_pairs << '\\n';\n}\n

    Output:

    []\n[]\n[1,2,3,4]\n[[\"one\",1],[\"two\",2]]\n
    "},{"location":"api/basic_json/array/#see-also","title":"See also","text":"
    • basic_json(initializer_list_t) - create a JSON value from an initializer list
    • object - create a JSON object value from an initializer list
    "},{"location":"api/basic_json/array/#version-history","title":"Version history","text":"
    • Added in version 1.0.0.
    "},{"location":"api/basic_json/array_t/","title":"nlohmann::basic_json::array_t","text":"
    using array_t = ArrayType<basic_json, AllocatorType<basic_json>>;\n

    The type used to store JSON arrays.

    RFC 8259 describes JSON arrays as follows:

    An array is an ordered sequence of zero or more values.

    To store objects in C++, a type is defined by the template parameters explained below.

    "},{"location":"api/basic_json/array_t/#template-parameters","title":"Template parameters","text":"ArrayType container type to store arrays (e.g., std::vector or std::list) AllocatorType the allocator to use for objects (e.g., std::allocator)"},{"location":"api/basic_json/array_t/#notes","title":"Notes","text":""},{"location":"api/basic_json/array_t/#default-type","title":"Default type","text":"

    With the default values for ArrayType (std::vector) and AllocatorType (std::allocator), the default value for array_t is:

    std::vector<\n  basic_json, // value_type\n  std::allocator<basic_json> // allocator_type\n>\n
    "},{"location":"api/basic_json/array_t/#limits","title":"Limits","text":"

    RFC 8259 specifies:

    An implementation may set limits on the maximum depth of nesting.

    In this class, the array's limit of nesting is not explicitly constrained. However, a maximum depth of nesting may be introduced by the compiler or runtime environment. A theoretical limit can be queried by calling the max_size function of a JSON array.

    "},{"location":"api/basic_json/array_t/#storage","title":"Storage","text":"

    Arrays are stored as pointers in a basic_json type. That is, for any access to array values, a pointer of type array_t* must be dereferenced.

    "},{"location":"api/basic_json/array_t/#examples","title":"Examples","text":"Example

    The following code shows that array_t is by default, a typedef to std::vector<nlohmann::json>.

    #include <iostream>\n#include <iomanip>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    std::cout << std::boolalpha << std::is_same<std::vector<json>, json::array_t>::value << std::endl;\n}\n

    Output:

    true\n
    "},{"location":"api/basic_json/array_t/#version-history","title":"Version history","text":"
    • Added in version 1.0.0.
    "},{"location":"api/basic_json/at/","title":"nlohmann::basic_json::at","text":"
    // (1)\nreference at(size_type idx);\nconst_reference at(size_type idx) const;\n\n// (2)\nreference at(const typename object_t::key_type& key);\nconst_reference at(const typename object_t::key_type& key) const;\n\n// (3)\ntemplate<typename KeyType>\nreference at(KeyType&& key);\ntemplate<typename KeyType>\nconst_reference at(KeyType&& key) const;\n\n// (4)\nreference at(const json_pointer& ptr);\nconst_reference at(const json_pointer& ptr) const;\n
    1. Returns a reference to the array element at specified location idx, with bounds checking.
    2. Returns a reference to the object element with specified key key, with bounds checking.
    3. See 2. This overload is only available if KeyType is comparable with typename object_t::key_type and typename object_comparator_t::is_transparent denotes a type.
    4. Returns a reference to the element at specified JSON pointer ptr, with bounds checking.
    "},{"location":"api/basic_json/at/#template-parameters","title":"Template parameters","text":"KeyType A type for an object key other than json_pointer that is comparable with string_t using object_comparator_t. This can also be a string view (C++17)."},{"location":"api/basic_json/at/#parameters","title":"Parameters","text":"idx (in) index of the element to access key (in) object key of the elements to access ptr (in) JSON pointer to the desired element"},{"location":"api/basic_json/at/#return-value","title":"Return value","text":"
    1. reference to the element at index idx
    2. reference to the element at key key
    3. reference to the element at key key
    4. reference to the element pointed to by ptr
    "},{"location":"api/basic_json/at/#exception-safety","title":"Exception safety","text":"

    Strong exception safety: if an exception occurs, the original value stays intact.

    "},{"location":"api/basic_json/at/#exceptions","title":"Exceptions","text":"
    1. The function can throw the following exceptions:
      • Throws type_error.304 if the JSON value is not an array; in this case, calling at with an index makes no sense. See the example below.
      • Throws out_of_range.401 if the index idx is out of range of the array; that is, idx >= size(). See the example below.
    2. The function can throw the following exceptions:
      • Throws type_error.304 if the JSON value is not an object; in this case, calling at with a key makes no sense. See the example below.
      • Throws out_of_range.403 if the key key is not stored in the object; that is, find(key) == end(). See the example below.
    3. See 2.
    4. The function can throw the following exceptions:
      • Throws parse_error.106 if an array index in the passed JSON pointer ptr begins with '0'. See the example below.
      • Throws parse_error.109 if an array index in the passed JSON pointer ptr is not a number. See the example below.
      • Throws out_of_range.401 if an array index in the passed JSON pointer ptr is out of range. See the example below.
      • Throws out_of_range.402 if the array index '-' is used in the passed JSON pointer ptr. As at provides checked access (and no elements are implicitly inserted), the index '-' is always invalid. See the example below.
      • Throws out_of_range.403 if the JSON pointer describes a key of an object which cannot be found. See the example below.
      • Throws out_of_range.404 if the JSON pointer ptr can not be resolved. See the example below.
    "},{"location":"api/basic_json/at/#complexity","title":"Complexity","text":"
    1. Constant.
    2. Logarithmic in the size of the container.
    3. Logarithmic in the size of the container.
    4. Logarithmic in the size of the container.
    "},{"location":"api/basic_json/at/#examples","title":"Examples","text":"Example: (1) access specified array element with bounds checking

    The example below shows how array elements can be read and written using at(). It also demonstrates the different exceptions that can be thrown.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // create JSON array\n    json array = {\"first\", \"2nd\", \"third\", \"fourth\"};\n\n    // output element at index 2 (third element)\n    std::cout << array.at(2) << '\\n';\n\n    // change element at index 1 (second element) to \"second\"\n    array.at(1) = \"second\";\n\n    // output changed array\n    std::cout << array << '\\n';\n\n    // exception type_error.304\n    try\n    {\n        // use at() on a non-array type\n        json str = \"I am a string\";\n        str.at(0) = \"Another string\";\n    }\n    catch (const json::type_error& e)\n    {\n        std::cout << e.what() << '\\n';\n    }\n\n    // exception out_of_range.401\n    try\n    {\n        // try to write beyond the array limit\n        array.at(5) = \"sixth\";\n    }\n    catch (const json::out_of_range& e)\n    {\n        std::cout << e.what() << '\\n';\n    }\n}\n

    Output:

    \"third\"\n[\"first\",\"second\",\"third\",\"fourth\"]\n[json.exception.type_error.304] cannot use at() with string\n[json.exception.out_of_range.401] array index 5 is out of range\n
    Example: (1) access specified array element with bounds checking

    The example below shows how array elements can be read using at(). It also demonstrates the different exceptions that can be thrown.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // create JSON array\n    const json array = {\"first\", \"2nd\", \"third\", \"fourth\"};\n\n    // output element at index 2 (third element)\n    std::cout << array.at(2) << '\\n';\n\n    // exception type_error.304\n    try\n    {\n        // use at() on a non-array type\n        const json str = \"I am a string\";\n        std::cout << str.at(0) << '\\n';\n    }\n    catch (const json::type_error& e)\n    {\n        std::cout << e.what() << '\\n';\n    }\n\n    // exception out_of_range.401\n    try\n    {\n        // try to read beyond the array limit\n        std::cout << array.at(5) << '\\n';\n    }\n    catch (const json::out_of_range& e)\n    {\n        std::cout << e.what() << '\\n';\n    }\n}\n

    Output:

    \"third\"\n[json.exception.type_error.304] cannot use at() with string\n[json.exception.out_of_range.401] array index 5 is out of range\n
    Example: (2) access specified object element with bounds checking

    The example below shows how object elements can be read and written using at(). It also demonstrates the different exceptions that can be thrown.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // create JSON object\n    json object =\n    {\n        {\"the good\", \"il buono\"},\n        {\"the bad\", \"il cattivo\"},\n        {\"the ugly\", \"il brutto\"}\n    };\n\n    // output element with key \"the ugly\"\n    std::cout << object.at(\"the ugly\") << '\\n';\n\n    // change element with key \"the bad\"\n    object.at(\"the bad\") = \"il cattivo\";\n\n    // output changed array\n    std::cout << object << '\\n';\n\n    // exception type_error.304\n    try\n    {\n        // use at() on a non-object type\n        json str = \"I am a string\";\n        str.at(\"the good\") = \"Another string\";\n    }\n    catch (const json::type_error& e)\n    {\n        std::cout << e.what() << '\\n';\n    }\n\n    // exception out_of_range.401\n    try\n    {\n        // try to write at a nonexisting key\n        object.at(\"the fast\") = \"il rapido\";\n    }\n    catch (const json::out_of_range& e)\n    {\n        std::cout << e.what() << '\\n';\n    }\n}\n

    Output:

    \"il brutto\"\n{\"the bad\":\"il cattivo\",\"the good\":\"il buono\",\"the ugly\":\"il brutto\"}\n[json.exception.type_error.304] cannot use at() with string\n[json.exception.out_of_range.403] key 'the fast' not found\n
    Example: (2) access specified object element with bounds checking

    The example below shows how object elements can be read using at(). It also demonstrates the different exceptions that can be thrown.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // create JSON object\n    const json object =\n    {\n        {\"the good\", \"il buono\"},\n        {\"the bad\", \"il cattivo\"},\n        {\"the ugly\", \"il brutto\"}\n    };\n\n    // output element with key \"the ugly\"\n    std::cout << object.at(\"the ugly\") << '\\n';\n\n    // exception type_error.304\n    try\n    {\n        // use at() on a non-object type\n        const json str = \"I am a string\";\n        std::cout << str.at(\"the good\") << '\\n';\n    }\n    catch (const json::type_error& e)\n    {\n        std::cout << e.what() << '\\n';\n    }\n\n    // exception out_of_range.401\n    try\n    {\n        // try to read from a nonexisting key\n        std::cout << object.at(\"the fast\") << '\\n';\n    }\n    catch (const json::out_of_range)\n    {\n        std::cout << \"out of range\" << '\\n';\n    }\n}\n

    Output:

    \"il brutto\"\n[json.exception.type_error.304] cannot use at() with string\nout of range\n
    Example: (3) access specified object element using string_view with bounds checking

    The example below shows how object elements can be read and written using at(). It also demonstrates the different exceptions that can be thrown.

    #include <iostream>\n#include <string_view>\n#include <nlohmann/json.hpp>\n\nusing namespace std::string_view_literals;\nusing json = nlohmann::json;\n\nint main()\n{\n    // create JSON object\n    json object =\n    {\n        {\"the good\", \"il buono\"},\n        {\"the bad\", \"il cattivo\"},\n        {\"the ugly\", \"il brutto\"}\n    };\n\n    // output element with key \"the ugly\" using string_view\n    std::cout << object.at(\"the ugly\"sv) << '\\n';\n\n    // change element with key \"the bad\" using string_view\n    object.at(\"the bad\"sv) = \"il cattivo\";\n\n    // output changed array\n    std::cout << object << '\\n';\n\n    // exception type_error.304\n    try\n    {\n        // use at() with string_view on a non-object type\n        json str = \"I am a string\";\n        str.at(\"the good\"sv) = \"Another string\";\n    }\n    catch (const json::type_error& e)\n    {\n        std::cout << e.what() << '\\n';\n    }\n\n    // exception out_of_range.401\n    try\n    {\n        // try to write at a nonexisting key using string_view\n        object.at(\"the fast\"sv) = \"il rapido\";\n    }\n    catch (const json::out_of_range& e)\n    {\n        std::cout << e.what() << '\\n';\n    }\n}\n

    Output:

    \"il brutto\"\n{\"the bad\":\"il cattivo\",\"the good\":\"il buono\",\"the ugly\":\"il brutto\"}\n[json.exception.type_error.304] cannot use at() with string\n[json.exception.out_of_range.403] key 'the fast' not found\n
    Example: (3) access specified object element using string_view with bounds checking

    The example below shows how object elements can be read using at(). It also demonstrates the different exceptions that can be thrown.

    #include <iostream>\n#include <string_view>\n#include <nlohmann/json.hpp>\n\nusing namespace std::string_view_literals;\nusing json = nlohmann::json;\n\nint main()\n{\n    // create JSON object\n    const json object =\n    {\n        {\"the good\", \"il buono\"},\n        {\"the bad\", \"il cattivo\"},\n        {\"the ugly\", \"il brutto\"}\n    };\n\n    // output element with key \"the ugly\" using string_view\n    std::cout << object.at(\"the ugly\"sv) << '\\n';\n\n    // exception type_error.304\n    try\n    {\n        // use at() with string_view on a non-object type\n        const json str = \"I am a string\";\n        std::cout << str.at(\"the good\"sv) << '\\n';\n    }\n    catch (const json::type_error& e)\n    {\n        std::cout << e.what() << '\\n';\n    }\n\n    // exception out_of_range.401\n    try\n    {\n        // try to read from a nonexisting key using string_view\n        std::cout << object.at(\"the fast\"sv) << '\\n';\n    }\n    catch (const json::out_of_range& e)\n    {\n        std::cout << \"out of range\" << '\\n';\n    }\n}\n

    Output:

    \"il brutto\"\n[json.exception.type_error.304] cannot use at() with string\nout of range\n
    Example: (4) access specified element via JSON Pointer

    The example below shows how object elements can be read and written using at(). It also demonstrates the different exceptions that can be thrown.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\nusing namespace nlohmann::literals;\n\nint main()\n{\n    // create a JSON value\n    json j =\n    {\n        {\"number\", 1}, {\"string\", \"foo\"}, {\"array\", {1, 2}}\n    };\n\n    // read-only access\n\n    // output element with JSON pointer \"/number\"\n    std::cout << j.at(\"/number\"_json_pointer) << '\\n';\n    // output element with JSON pointer \"/string\"\n    std::cout << j.at(\"/string\"_json_pointer) << '\\n';\n    // output element with JSON pointer \"/array\"\n    std::cout << j.at(\"/array\"_json_pointer) << '\\n';\n    // output element with JSON pointer \"/array/1\"\n    std::cout << j.at(\"/array/1\"_json_pointer) << '\\n';\n\n    // writing access\n\n    // change the string\n    j.at(\"/string\"_json_pointer) = \"bar\";\n    // output the changed string\n    std::cout << j[\"string\"] << '\\n';\n\n    // change an array element\n    j.at(\"/array/1\"_json_pointer) = 21;\n    // output the changed array\n    std::cout << j[\"array\"] << '\\n';\n\n    // out_of_range.106\n    try\n    {\n        // try to use an array index with leading '0'\n        json::reference ref = j.at(\"/array/01\"_json_pointer);\n    }\n    catch (const json::parse_error& e)\n    {\n        std::cout << e.what() << '\\n';\n    }\n\n    // out_of_range.109\n    try\n    {\n        // try to use an array index that is not a number\n        json::reference ref = j.at(\"/array/one\"_json_pointer);\n    }\n    catch (const json::parse_error& e)\n    {\n        std::cout << e.what() << '\\n';\n    }\n\n    // out_of_range.401\n    try\n    {\n        // try to use an invalid array index\n        json::reference ref = j.at(\"/array/4\"_json_pointer);\n    }\n    catch (const json::out_of_range& e)\n    {\n        std::cout << e.what() << '\\n';\n    }\n\n    // out_of_range.402\n    try\n    {\n        // try to use the array index '-'\n        json::reference ref = j.at(\"/array/-\"_json_pointer);\n    }\n    catch (const json::out_of_range& e)\n    {\n        std::cout << e.what() << '\\n';\n    }\n\n    // out_of_range.403\n    try\n    {\n        // try to use a JSON pointer to a nonexistent object key\n        json::const_reference ref = j.at(\"/foo\"_json_pointer);\n    }\n    catch (const json::out_of_range& e)\n    {\n        std::cout << e.what() << '\\n';\n    }\n\n    // out_of_range.404\n    try\n    {\n        // try to use a JSON pointer that cannot be resolved\n        json::reference ref = j.at(\"/number/foo\"_json_pointer);\n    }\n    catch (const json::out_of_range& e)\n    {\n        std::cout << e.what() << '\\n';\n    }\n}\n

    Output:

    1\n\"foo\"\n[1,2]\n2\n\"bar\"\n[1,21]\n[json.exception.parse_error.106] parse error: array index '01' must not begin with '0'\n[json.exception.parse_error.109] parse error: array index 'one' is not a number\n[json.exception.out_of_range.401] array index 4 is out of range\n[json.exception.out_of_range.402] array index '-' (2) is out of range\n[json.exception.out_of_range.403] key 'foo' not found\n[json.exception.out_of_range.404] unresolved reference token 'foo'\n
    Example: (4) access specified element via JSON Pointer

    The example below shows how object elements can be read using at(). It also demonstrates the different exceptions that can be thrown.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\nusing namespace nlohmann::literals;\n\nint main()\n{\n    // create a JSON value\n    const json j =\n    {\n        {\"number\", 1}, {\"string\", \"foo\"}, {\"array\", {1, 2}}\n    };\n\n    // read-only access\n\n    // output element with JSON pointer \"/number\"\n    std::cout << j.at(\"/number\"_json_pointer) << '\\n';\n    // output element with JSON pointer \"/string\"\n    std::cout << j.at(\"/string\"_json_pointer) << '\\n';\n    // output element with JSON pointer \"/array\"\n    std::cout << j.at(\"/array\"_json_pointer) << '\\n';\n    // output element with JSON pointer \"/array/1\"\n    std::cout << j.at(\"/array/1\"_json_pointer) << '\\n';\n\n    // out_of_range.109\n    try\n    {\n        // try to use an array index that is not a number\n        json::const_reference ref = j.at(\"/array/one\"_json_pointer);\n    }\n    catch (const json::parse_error& e)\n    {\n        std::cout << e.what() << '\\n';\n    }\n\n    // out_of_range.401\n    try\n    {\n        // try to use an invalid array index\n        json::const_reference ref = j.at(\"/array/4\"_json_pointer);\n    }\n    catch (const json::out_of_range& e)\n    {\n        std::cout << e.what() << '\\n';\n    }\n\n    // out_of_range.402\n    try\n    {\n        // try to use the array index '-'\n        json::const_reference ref = j.at(\"/array/-\"_json_pointer);\n    }\n    catch (const json::out_of_range& e)\n    {\n        std::cout << e.what() << '\\n';\n    }\n\n    // out_of_range.403\n    try\n    {\n        // try to use a JSON pointer to a nonexistent object key\n        json::const_reference ref = j.at(\"/foo\"_json_pointer);\n    }\n    catch (const json::out_of_range& e)\n    {\n        std::cout << e.what() << '\\n';\n    }\n\n    // out_of_range.404\n    try\n    {\n        // try to use a JSON pointer that cannot be resolved\n        json::const_reference ref = j.at(\"/number/foo\"_json_pointer);\n    }\n    catch (const json::out_of_range& e)\n    {\n        std::cout << e.what() << '\\n';\n    }\n}\n

    Output:

    1\n\"foo\"\n[1,2]\n2\n[json.exception.parse_error.109] parse error: array index 'one' is not a number\n[json.exception.out_of_range.401] array index 4 is out of range\n[json.exception.out_of_range.402] array index '-' (2) is out of range\n[json.exception.out_of_range.403] key 'foo' not found\n[json.exception.out_of_range.404] unresolved reference token 'foo'\n
    "},{"location":"api/basic_json/at/#see-also","title":"See also","text":"
    • documentation on checked access
    • operator[] for unchecked access by reference
    • value for access with default value
    "},{"location":"api/basic_json/at/#version-history","title":"Version history","text":"
    1. Added in version 1.0.0.
    2. Added in version 1.0.0.
    3. Added in version 3.11.0.
    4. Added in version 2.0.0.
    "},{"location":"api/basic_json/back/","title":"nlohmann::basic_json::back","text":"
    reference back();\n\nconst_reference back() const;\n

    Returns a reference to the last element in the container. For a JSON container c, the expression c.back() is equivalent to

    auto tmp = c.end();\n--tmp;\nreturn *tmp;\n
    "},{"location":"api/basic_json/back/#return-value","title":"Return value","text":"

    In the case of a structured type (array or object), a reference to the last element is returned. In the case of number, string, boolean, or binary values, a reference to the value is returned.

    "},{"location":"api/basic_json/back/#exception-safety","title":"Exception safety","text":"

    Strong guarantee: if an exception is thrown, there are no changes in the JSON value.

    "},{"location":"api/basic_json/back/#exceptions","title":"Exceptions","text":"

    If the JSON value is null, exception invalid_iterator.214 is thrown.

    "},{"location":"api/basic_json/back/#complexity","title":"Complexity","text":"

    Constant.

    "},{"location":"api/basic_json/back/#notes","title":"Notes","text":"

    Precondition

    The array or object must not be empty. Calling back on an empty array or object yields undefined behavior.

    "},{"location":"api/basic_json/back/#examples","title":"Examples","text":"Example

    The following code shows an example for back().

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // create JSON values\n    json j_boolean = true;\n    json j_number_integer = 17;\n    json j_number_float = 23.42;\n    json j_object = {{\"one\", 1}, {\"two\", 2}};\n    json j_object_empty(json::value_t::object);\n    json j_array = {1, 2, 4, 8, 16};\n    json j_array_empty(json::value_t::array);\n    json j_string = \"Hello, world\";\n\n    // call back()\n    std::cout << j_boolean.back() << '\\n';\n    std::cout << j_number_integer.back() << '\\n';\n    std::cout << j_number_float.back() << '\\n';\n    std::cout << j_object.back() << '\\n';\n    //std::cout << j_object_empty.back() << '\\n';  // undefined behavior\n    std::cout << j_array.back() << '\\n';\n    //std::cout << j_array_empty.back() << '\\n';   // undefined behavior\n    std::cout << j_string.back() << '\\n';\n\n    // back() called on a null value\n    try\n    {\n        json j_null;\n        j_null.back();\n    }\n    catch (const json::invalid_iterator& e)\n    {\n        std::cout << e.what() << '\\n';\n    }\n}\n

    Output:

    true\n17\n23.42\n2\n16\n\"Hello, world\"\n[json.exception.invalid_iterator.214] cannot get value\n
    "},{"location":"api/basic_json/back/#see-also","title":"See also","text":"
    • front to access the first element
    "},{"location":"api/basic_json/back/#version-history","title":"Version history","text":"
    • Added in version 1.0.0.
    • Adjusted code to return reference to binary values in version 3.8.0.
    "},{"location":"api/basic_json/basic_json/","title":"nlohmann::basic_json::basic_json","text":"
    // (1)\nbasic_json(const value_t v);\n\n// (2)\nbasic_json(std::nullptr_t = nullptr) noexcept;\n\n// (3)\ntemplate<typename CompatibleType>\nbasic_json(CompatibleType&& val) noexcept(noexcept(\n           JSONSerializer<U>::to_json(std::declval<basic_json_t&>(),\n                                      std::forward<CompatibleType>(val))));\n\n// (4)\ntemplate<typename BasicJsonType>\nbasic_json(const BasicJsonType& val);\n\n// (5)\nbasic_json(initializer_list_t init,\n           bool type_deduction = true,\n           value_t manual_type = value_t::array);\n\n// (6)\nbasic_json(size_type cnt, const basic_json& val);\n\n// (7)\nbasic_json(iterator first, iterator last);\nbasic_json(const_iterator first, const_iterator last);\n\n// (8)\nbasic_json(const basic_json& other);\n\n// (9)\nbasic_json(basic_json&& other) noexcept;\n

    1. Create an empty JSON value with a given type. The value will be default initialized with an empty value which depends on the type:

      Value type initial value null null boolean false string \"\" number 0 object {} array [] binary empty array

      The postcondition of this constructor can be restored by calling clear().

    2. Create a null JSON value. It either takes a null pointer as parameter (explicitly creating null) or no parameter (implicitly creating null). The passed null pointer itself is not read -- it is only used to choose the right constructor.

    3. This is a \"catch all\" constructor for all compatible JSON types; that is, types for which a to_json() method exists. The constructor forwards the parameter val to that method (to json_serializer<U>::to_json method with U = uncvref_t<CompatibleType>, to be exact).

      Template type CompatibleType includes, but is not limited to, the following types:

      • arrays: array_t and all kinds of compatible containers such as std::vector, std::deque, std::list, std::forward_list, std::array, std::valarray, std::set, std::unordered_set, std::multiset, and std::unordered_multiset with a value_type from which a basic_json value can be constructed.
      • objects: object_t and all kinds of compatible associative containers such as std::map, std::unordered_map, std::multimap, and std::unordered_multimap with a key_type compatible to string_t and a value_type from which a basic_json value can be constructed.
      • strings: string_t, string literals, and all compatible string containers can be used.
      • numbers: number_integer_t, number_unsigned_t, number_float_t, and all convertible number types such as int, size_t, int64_t, float or double can be used.
      • boolean: boolean_t / bool can be used.
      • binary: binary_t / std::vector<uint8_t> may be used; unfortunately because string literals cannot be distinguished from binary character arrays by the C++ type system, all types compatible with const char* will be directed to the string constructor instead. This is both for backwards compatibility and due to the fact that a binary type is not a standard JSON type.

      See the examples below.

    4. This is a constructor for existing basic_json types. It does not hijack copy/move constructors, since the parameter has different template arguments than the current ones.

      The constructor tries to convert the internal m_value of the parameter.

    5. Creates a JSON value of type array or object from the passed initializer list init. In case type_deduction is true (default), the type of the JSON value to be created is deducted from the initializer list init according to the following rules:

      1. If the list is empty, an empty JSON object value {} is created.
      2. If the list consists of pairs whose first element is a string, a JSON object value is created where the first elements of the pairs are treated as keys and the second elements are as values.
      3. In all other cases, an array is created.

      The rules aim to create the best fit between a C++ initializer list and JSON values. The rationale is as follows:

      1. The empty initializer list is written as {} which is exactly an empty JSON object.
      2. C++ has no way of describing mapped types other than to list a list of pairs. As JSON requires that keys must be of type string, rule 2 is the weakest constraint one can pose on initializer lists to interpret them as an object.
      3. In all other cases, the initializer list could not be interpreted as a JSON object type, so interpreting it as a JSON array type is safe.

      With the rules described above, the following JSON values cannot be expressed by an initializer list:

      • the empty array ([]): use array(initializer_list_t) with an empty initializer list in this case
      • arrays whose elements satisfy rule 2: use array(initializer_list_t) with the same initializer list in this case

      Function array() and object() force array and object creation from initializer lists, respectively.

    6. Constructs a JSON array value by creating cnt copies of a passed value. In case cnt is 0, an empty array is created.

    7. Constructs the JSON value with the contents of the range [first, last). The semantics depend on the different types a JSON value can have:

      • In case of a null type, invalid_iterator.206 is thrown.
      • In case of other primitive types (number, boolean, or string), first must be begin() and last must be end(). In this case, the value is copied. Otherwise, invalid_iterator.204 is thrown.
      • In case of structured types (array, object), the constructor behaves as similar versions for std::vector or std::map; that is, a JSON array or object is constructed from the values in the range.

    8. Creates a copy of a given JSON value.

    9. Move constructor. Constructs a JSON value with the contents of the given value other using move semantics. It \"steals\" the resources from other and leaves it as JSON null value.

    "},{"location":"api/basic_json/basic_json/#template-parameters","title":"Template parameters","text":"CompatibleType

    a type such that:

    • CompatibleType is not derived from std::istream,
    • CompatibleType is not basic_json (to avoid hijacking copy/move constructors),
    • CompatibleType is not a different basic_json type (i.e. with different template arguments)
    • CompatibleType is not a basic_json nested type (e.g., json_pointer, iterator, etc.)
    • json_serializer<U> (with U = uncvref_t<CompatibleType>) has a to_json(basic_json_t&, CompatibleType&&) method
    BasicJsonType:

    a type such that:

    • BasicJsonType is a basic_json type.
    • BasicJsonType has different template arguments than basic_json_t.
    U: uncvref_t<CompatibleType>"},{"location":"api/basic_json/basic_json/#parameters","title":"Parameters","text":"v (in) the type of the value to create val (in) the value to be forwarded to the respective constructor init (in) initializer list with JSON values type_deduction (in) internal parameter; when set to true, the type of the JSON value is deducted from the initializer list init; when set to false, the type provided via manual_type is forced. This mode is used by the functions array(initializer_list_t) and object(initializer_list_t). manual_type (in) internal parameter; when type_deduction is set to false, the created JSON value will use the provided type (only value_t::array and value_t::object are valid); when type_deduction is set to true, this parameter has no effect cnt (in) the number of JSON copies of val to create first (in) the beginning of the range to copy from (included) last (in) the end of the range to copy from (excluded) other (in) the JSON value to copy/move"},{"location":"api/basic_json/basic_json/#exception-safety","title":"Exception safety","text":"
    1. Strong guarantee: if an exception is thrown, there are no changes to any JSON value.
    2. No-throw guarantee: this constructor never throws exceptions.
    3. Depends on the called constructor. For types directly supported by the library (i.e., all types for which no to_json() function was provided), a strong guarantee holds: if an exception is thrown, there are no changes to any JSON value.
    4. Depends on the called constructor. For types directly supported by the library (i.e., all types for which no to_json() function was provided), a strong guarantee holds: if an exception is thrown, there are no changes to any JSON value.
    5. Strong guarantee: if an exception is thrown, there are no changes to any JSON value.
    6. Strong guarantee: if an exception is thrown, there are no changes to any JSON value.
    7. Strong guarantee: if an exception is thrown, there are no changes to any JSON value.
    8. Strong guarantee: if an exception is thrown, there are no changes to any JSON value.
    9. No-throw guarantee: this constructor never throws exceptions.
    "},{"location":"api/basic_json/basic_json/#exceptions","title":"Exceptions","text":"
    1. (none)
    2. The function does not throw exceptions.
    3. (none)
    4. (none)
    5. The function can throw the following exceptions:
      • Throws type_error.301 if type_deduction is false, manual_type is value_t::object, but init contains an element which is not a pair whose first element is a string. In this case, the constructor could not create an object. If type_deduction would have been true, an array would have been created. See object(initializer_list_t) for an example.
    6. (none)
    7. The function can throw the following exceptions:
      • Throws invalid_iterator.201 if iterators first and last are not compatible (i.e., do not belong to the same JSON value). In this case, the range [first, last) is undefined.
      • Throws invalid_iterator.204 if iterators first and last belong to a primitive type (number, boolean, or string), but first does not point to the first element anymore. In this case, the range [first, last) is undefined. See the example code below.
      • Throws invalid_iterator.206 if iterators first and last belong to a null value. In this case, the range [first, last) is undefined.
    8. (none)
    9. The function does not throw exceptions.
    "},{"location":"api/basic_json/basic_json/#complexity","title":"Complexity","text":"
    1. Constant.
    2. Constant.
    3. Usually linear in the size of the passed val, also depending on the implementation of the called to_json() method.
    4. Usually linear in the size of the passed val, also depending on the implementation of the called to_json() method.
    5. Linear in the size of the initializer list init.
    6. Linear in cnt.
    7. Linear in distance between first and last.
    8. Linear in the size of other.
    9. Constant.
    "},{"location":"api/basic_json/basic_json/#notes","title":"Notes","text":"

    • Overload 5:

      Empty initializer list

      When used without parentheses around an empty initializer list, basic_json() is called instead of this function, yielding the JSON null value.

    • Overload 7:

      Preconditions

      • Iterators first and last must be initialized. **This precondition is enforced with a runtime assertion.
      • Range [first, last) is valid. Usually, this precondition cannot be checked efficiently. Only certain edge cases are detected; see the description of the exceptions above. A violation of this precondition yields undefined behavior.

      Runtime assertion

      A precondition is enforced with a runtime assertion.

    • Overload 8:

      Postcondition

      *this == other

    • Overload 9:

      Postconditions

      • `*this has the same value as other before the call.
      • other is a JSON null value
    "},{"location":"api/basic_json/basic_json/#examples","title":"Examples","text":"Example: (1) create an empty value with a given type

    The following code shows the constructor for different value_t values.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // create the different JSON values with default values\n    json j_null(json::value_t::null);\n    json j_boolean(json::value_t::boolean);\n    json j_number_integer(json::value_t::number_integer);\n    json j_number_float(json::value_t::number_float);\n    json j_object(json::value_t::object);\n    json j_array(json::value_t::array);\n    json j_string(json::value_t::string);\n\n    // serialize the JSON values\n    std::cout << j_null << '\\n';\n    std::cout << j_boolean << '\\n';\n    std::cout << j_number_integer << '\\n';\n    std::cout << j_number_float << '\\n';\n    std::cout << j_object << '\\n';\n    std::cout << j_array << '\\n';\n    std::cout << j_string << '\\n';\n}\n

    Output:

    null\nfalse\n0\n0.0\n{}\n[]\n\"\"\n
    Example: (2) create a null object

    The following code shows the constructor with and without a null pointer parameter.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // implicitly create a JSON null value\n    json j1;\n\n    // explicitly create a JSON null value\n    json j2(nullptr);\n\n    // serialize the JSON null value\n    std::cout << j1 << '\\n' << j2 << '\\n';\n}\n

    Output:

    null\nnull\n
    Example: (3) create a JSON value from compatible types

    The following code shows the constructor with several compatible types.

    #include <iostream>\n#include <deque>\n#include <list>\n#include <forward_list>\n#include <set>\n#include <unordered_map>\n#include <unordered_set>\n#include <valarray>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // ============\n    // object types\n    // ============\n\n    // create an object from an object_t value\n    json::object_t object_value = { {\"one\", 1}, {\"two\", 2} };\n    json j_object_t(object_value);\n\n    // create an object from std::map\n    std::map<std::string, int> c_map\n    {\n        {\"one\", 1}, {\"two\", 2}, {\"three\", 3}\n    };\n    json j_map(c_map);\n\n    // create an object from std::unordered_map\n    std::unordered_map<const char*, double> c_umap\n    {\n        {\"one\", 1.2}, {\"two\", 2.3}, {\"three\", 3.4}\n    };\n    json j_umap(c_umap);\n\n    // create an object from std::multimap\n    std::multimap<std::string, bool> c_mmap\n    {\n        {\"one\", true}, {\"two\", true}, {\"three\", false}, {\"three\", true}\n    };\n    json j_mmap(c_mmap); // only one entry for key \"three\" is used\n\n    // create an object from std::unordered_multimap\n    std::unordered_multimap<std::string, bool> c_ummap\n    {\n        {\"one\", true}, {\"two\", true}, {\"three\", false}, {\"three\", true}\n    };\n    json j_ummap(c_ummap); // only one entry for key \"three\" is used\n\n    // serialize the JSON objects\n    std::cout << j_object_t << '\\n';\n    std::cout << j_map << '\\n';\n    std::cout << j_umap << '\\n';\n    std::cout << j_mmap << '\\n';\n    std::cout << j_ummap << \"\\n\\n\";\n\n    // ===========\n    // array types\n    // ===========\n\n    // create an array from an array_t value\n    json::array_t array_value = {\"one\", \"two\", 3, 4.5, false};\n    json j_array_t(array_value);\n\n    // create an array from std::vector\n    std::vector<int> c_vector {1, 2, 3, 4};\n    json j_vec(c_vector);\n\n    // create an array from std::valarray\n    std::valarray<short> c_valarray {10, 9, 8, 7};\n    json j_valarray(c_valarray);\n\n    // create an array from std::deque\n    std::deque<double> c_deque {1.2, 2.3, 3.4, 5.6};\n    json j_deque(c_deque);\n\n    // create an array from std::list\n    std::list<bool> c_list {true, true, false, true};\n    json j_list(c_list);\n\n    // create an array from std::forward_list\n    std::forward_list<std::int64_t> c_flist {12345678909876, 23456789098765, 34567890987654, 45678909876543};\n    json j_flist(c_flist);\n\n    // create an array from std::array\n    std::array<unsigned long, 4> c_array {{1, 2, 3, 4}};\n    json j_array(c_array);\n\n    // create an array from std::set\n    std::set<std::string> c_set {\"one\", \"two\", \"three\", \"four\", \"one\"};\n    json j_set(c_set); // only one entry for \"one\" is used\n\n    // create an array from std::unordered_set\n    std::unordered_set<std::string> c_uset {\"one\", \"two\", \"three\", \"four\", \"one\"};\n    json j_uset(c_uset); // only one entry for \"one\" is used\n\n    // create an array from std::multiset\n    std::multiset<std::string> c_mset {\"one\", \"two\", \"one\", \"four\"};\n    json j_mset(c_mset); // both entries for \"one\" are used\n\n    // create an array from std::unordered_multiset\n    std::unordered_multiset<std::string> c_umset {\"one\", \"two\", \"one\", \"four\"};\n    json j_umset(c_umset); // both entries for \"one\" are used\n\n    // serialize the JSON arrays\n    std::cout << j_array_t << '\\n';\n    std::cout << j_vec << '\\n';\n    std::cout << j_valarray << '\\n';\n    std::cout << j_deque << '\\n';\n    std::cout << j_list << '\\n';\n    std::cout << j_flist << '\\n';\n    std::cout << j_array << '\\n';\n    std::cout << j_set << '\\n';\n    std::cout << j_uset << '\\n';\n    std::cout << j_mset << '\\n';\n    std::cout << j_umset << \"\\n\\n\";\n\n    // ============\n    // string types\n    // ============\n\n    // create string from a string_t value\n    json::string_t string_value = \"The quick brown fox jumps over the lazy dog.\";\n    json j_string_t(string_value);\n\n    // create a JSON string directly from a string literal\n    json j_string_literal(\"The quick brown fox jumps over the lazy dog.\");\n\n    // create string from std::string\n    std::string s_stdstring = \"The quick brown fox jumps over the lazy dog.\";\n    json j_stdstring(s_stdstring);\n\n    // serialize the JSON strings\n    std::cout << j_string_t << '\\n';\n    std::cout << j_string_literal << '\\n';\n    std::cout << j_stdstring << \"\\n\\n\";\n\n    // ============\n    // number types\n    // ============\n\n    // create a JSON number from number_integer_t\n    json::number_integer_t value_integer_t = -42;\n    json j_integer_t(value_integer_t);\n\n    // create a JSON number from number_unsigned_t\n    json::number_integer_t value_unsigned_t = 17;\n    json j_unsigned_t(value_unsigned_t);\n\n    // create a JSON number from an anonymous enum\n    enum { enum_value = 17 };\n    json j_enum(enum_value);\n\n    // create values of different integer types\n    short n_short = 42;\n    int n_int = -23;\n    long n_long = 1024;\n    int_least32_t n_int_least32_t = -17;\n    uint8_t n_uint8_t = 8;\n\n    // create (integer) JSON numbers\n    json j_short(n_short);\n    json j_int(n_int);\n    json j_long(n_long);\n    json j_int_least32_t(n_int_least32_t);\n    json j_uint8_t(n_uint8_t);\n\n    // create values of different floating-point types\n    json::number_float_t v_ok = 3.141592653589793;\n    json::number_float_t v_nan = NAN;\n    json::number_float_t v_infinity = INFINITY;\n\n    // create values of different floating-point types\n    float n_float = 42.23;\n    float n_float_nan = 1.0f / 0.0f;\n    double n_double = 23.42;\n\n    // create (floating point) JSON numbers\n    json j_ok(v_ok);\n    json j_nan(v_nan);\n    json j_infinity(v_infinity);\n    json j_float(n_float);\n    json j_float_nan(n_float_nan);\n    json j_double(n_double);\n\n    // serialize the JSON numbers\n    std::cout << j_integer_t << '\\n';\n    std::cout << j_unsigned_t << '\\n';\n    std::cout << j_enum << '\\n';\n    std::cout << j_short << '\\n';\n    std::cout << j_int << '\\n';\n    std::cout << j_long << '\\n';\n    std::cout << j_int_least32_t << '\\n';\n    std::cout << j_uint8_t << '\\n';\n    std::cout << j_ok << '\\n';\n    std::cout << j_nan << '\\n';\n    std::cout << j_infinity << '\\n';\n    std::cout << j_float << '\\n';\n    std::cout << j_float_nan << '\\n';\n    std::cout << j_double << \"\\n\\n\";\n\n    // =============\n    // boolean types\n    // =============\n\n    // create boolean values\n    json j_truth = true;\n    json j_falsity = false;\n\n    // serialize the JSON booleans\n    std::cout << j_truth << '\\n';\n    std::cout << j_falsity << '\\n';\n}\n

    Output:

    {\"one\":1,\"two\":2}\n{\"one\":1,\"three\":3,\"two\":2}\n{\"one\":1.2,\"three\":3.4,\"two\":2.3}\n{\"one\":true,\"three\":false,\"two\":true}\n{\"one\":true,\"three\":false,\"two\":true}\n\n[\"one\",\"two\",3,4.5,false]\n[1,2,3,4]\n[10,9,8,7]\n[1.2,2.3,3.4,5.6]\n[true,true,false,true]\n[12345678909876,23456789098765,34567890987654,45678909876543]\n[1,2,3,4]\n[\"four\",\"one\",\"three\",\"two\"]\n[\"four\",\"three\",\"two\",\"one\"]\n[\"four\",\"one\",\"one\",\"two\"]\n[\"four\",\"two\",\"one\",\"one\"]\n\n\"The quick brown fox jumps over the lazy dog.\"\n\"The quick brown fox jumps over the lazy dog.\"\n\"The quick brown fox jumps over the lazy dog.\"\n\n-42\n17\n17\n42\n-23\n1024\n-17\n8\n3.141592653589793\nnull\nnull\n42.22999954223633\nnull\n23.42\n\ntrue\nfalse\n

    Note the output is platform-dependent.

    Example: (5) create a container (array or object) from an initializer list

    The example below shows how JSON values are created from initializer lists.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // create JSON values\n    json j_empty_init_list = json({});\n    json j_object = { {\"one\", 1}, {\"two\", 2} };\n    json j_array = {1, 2, 3, 4};\n    json j_nested_object = { {\"one\", {1}}, {\"two\", {1, 2}} };\n    json j_nested_array = { {{1}, \"one\"}, {{1, 2}, \"two\"} };\n\n    // serialize the JSON value\n    std::cout << j_empty_init_list << '\\n';\n    std::cout << j_object << '\\n';\n    std::cout << j_array << '\\n';\n    std::cout << j_nested_object << '\\n';\n    std::cout << j_nested_array << '\\n';\n}\n

    Output:

    {}\n{\"one\":1,\"two\":2}\n[1,2,3,4]\n{\"one\":[1],\"two\":[1,2]}\n[[[1],\"one\"],[[1,2],\"two\"]]\n
    Example: (6) construct an array with count copies of a given value

    The following code shows examples for creating arrays with several copies of a given value.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // create an array by creating copies of a JSON value\n    json value = \"Hello\";\n    json array_0 = json(0, value);\n    json array_1 = json(1, value);\n    json array_5 = json(5, value);\n\n    // serialize the JSON arrays\n    std::cout << array_0 << '\\n';\n    std::cout << array_1 << '\\n';\n    std::cout << array_5 << '\\n';\n}\n

    Output:

    []\n[\"Hello\"]\n[\"Hello\",\"Hello\",\"Hello\",\"Hello\",\"Hello\"]\n
    Example: (7) construct a JSON container given an iterator range

    The example below shows several ways to create JSON values by specifying a subrange with iterators.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // create JSON values\n    json j_array = {\"alpha\", \"bravo\", \"charly\", \"delta\", \"easy\"};\n    json j_number = 42;\n    json j_object = {{\"one\", \"eins\"}, {\"two\", \"zwei\"}};\n\n    // create copies using iterators\n    json j_array_range(j_array.begin() + 1, j_array.end() - 2);\n    json j_number_range(j_number.begin(), j_number.end());\n    json j_object_range(j_object.begin(), j_object.find(\"two\"));\n\n    // serialize the values\n    std::cout << j_array_range << '\\n';\n    std::cout << j_number_range << '\\n';\n    std::cout << j_object_range << '\\n';\n\n    // example for an exception\n    try\n    {\n        json j_invalid(j_number.begin() + 1, j_number.end());\n    }\n    catch (const json::invalid_iterator& e)\n    {\n        std::cout << e.what() << '\\n';\n    }\n}\n

    Output:

    [\"bravo\",\"charly\"]\n42\n{\"one\":\"eins\"}\n[json.exception.invalid_iterator.204] iterators out of range\n
    Example: (8) copy constructor

    The following code shows an example for the copy constructor.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // create a JSON array\n    json j1 = {\"one\", \"two\", 3, 4.5, false};\n\n    // create a copy\n    json j2(j1);\n\n    // serialize the JSON array\n    std::cout << j1 << \" = \" << j2 << '\\n';\n    std::cout << std::boolalpha << (j1 == j2) << '\\n';\n}\n

    Output:

    [\"one\",\"two\",3,4.5,false] = [\"one\",\"two\",3,4.5,false]\ntrue\n
    Example: (9) move constructor

    The code below shows the move constructor explicitly called via std::move.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // create a JSON value\n    json a = 23;\n\n    // move contents of a to b\n    json b(std::move(a));\n\n    // serialize the JSON arrays\n    std::cout << a << '\\n';\n    std::cout << b << '\\n';\n}\n

    Output:

    null\n23\n
    "},{"location":"api/basic_json/basic_json/#version-history","title":"Version history","text":"
    1. Since version 1.0.0.
    2. Since version 1.0.0.
    3. Since version 2.1.0.
    4. Since version 3.2.0.
    5. Since version 1.0.0.
    6. Since version 1.0.0.
    7. Since version 1.0.0.
    8. Since version 1.0.0.
    9. Since version 1.0.0.
    "},{"location":"api/basic_json/begin/","title":"nlohmann::basic_json::begin","text":"
    iterator begin() noexcept;\nconst_iterator begin() const noexcept;\n

    Returns an iterator to the first element.

    "},{"location":"api/basic_json/begin/#return-value","title":"Return value","text":"

    iterator to the first element

    "},{"location":"api/basic_json/begin/#exception-safety","title":"Exception safety","text":"

    No-throw guarantee: this member function never throws exceptions.

    "},{"location":"api/basic_json/begin/#complexity","title":"Complexity","text":"

    Constant.

    "},{"location":"api/basic_json/begin/#examples","title":"Examples","text":"Example

    The following code shows an example for begin().

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // create an array value\n    json array = {1, 2, 3, 4, 5};\n\n    // get an iterator to the first element\n    json::iterator it = array.begin();\n\n    // serialize the element that the iterator points to\n    std::cout << *it << '\\n';\n}\n

    Output:

    1\n
    "},{"location":"api/basic_json/begin/#version-history","title":"Version history","text":"
    • Added in version 1.0.0.
    "},{"location":"api/basic_json/binary/","title":"nlohmann::basic_json::binary","text":"
    // (1)\nstatic basic_json binary(const typename binary_t::container_type& init);\nstatic basic_json binary(typename binary_t::container_type&& init);\n\n// (2)\nstatic basic_json binary(const typename binary_t::container_type& init,\n                         std::uint8_t subtype);\nstatic basic_json binary(typename binary_t::container_type&& init,\n                         std::uint8_t subtype);\n
    1. Creates a JSON binary array value from a given binary container.
    2. Creates a JSON binary array value from a given binary container with subtype.

    Binary values are part of various binary formats, such as CBOR, MessagePack, and BSON. This constructor is used to create a value for serialization to those formats.

    "},{"location":"api/basic_json/binary/#parameters","title":"Parameters","text":"init (in) container containing bytes to use as a binary type subtype (in) subtype to use in CBOR, MessagePack, and BSON"},{"location":"api/basic_json/binary/#return-value","title":"Return value","text":"

    JSON binary array value

    "},{"location":"api/basic_json/binary/#exception-safety","title":"Exception safety","text":"

    Strong guarantee: if an exception is thrown, there are no changes in the JSON value.

    "},{"location":"api/basic_json/binary/#complexity","title":"Complexity","text":"

    Linear in the size of init; constant for typename binary_t::container_type&& init versions.

    "},{"location":"api/basic_json/binary/#notes","title":"Notes","text":"

    Note, this function exists because of the difficulty in correctly specifying the correct template overload in the standard value ctor, as both JSON arrays and JSON binary arrays are backed with some form of a std::vector. Because JSON binary arrays are a non-standard extension, it was decided that it would be best to prevent automatic initialization of a binary array type, for backwards compatibility and so it does not happen on accident.

    "},{"location":"api/basic_json/binary/#examples","title":"Examples","text":"Example

    The following code shows how to create a binary value.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // create a binary vector\n    std::vector<std::uint8_t> vec = {0xCA, 0xFE, 0xBA, 0xBE};\n\n    // create a binary JSON value with subtype 42\n    json j = json::binary(vec, 42);\n\n    // output type and subtype\n    std::cout << \"type: \" << j.type_name() << \", subtype: \" << j.get_binary().subtype() << std::endl;\n}\n

    Output:

    type: binary, subtype: 42\n
    "},{"location":"api/basic_json/binary/#version-history","title":"Version history","text":"
    • Added in version 3.8.0.
    "},{"location":"api/basic_json/binary_t/","title":"nlohmann::basic_json::binary_t","text":"
    using binary_t = byte_container_with_subtype<BinaryType>;\n

    This type is a type designed to carry binary data that appears in various serialized formats, such as CBOR's Major Type 2, MessagePack's bin, and BSON's generic binary subtype. This type is NOT a part of standard JSON and exists solely for compatibility with these binary types. As such, it is simply defined as an ordered sequence of zero or more byte values.

    Additionally, as an implementation detail, the subtype of the binary data is carried around as a std::uint64_t, which is compatible with both of the binary data formats that use binary subtyping, (though the specific numbering is incompatible with each other, and it is up to the user to translate between them). The subtype is added to BinaryType via the helper type byte_container_with_subtype.

    CBOR's RFC 7049 describes this type as:

    Major type 2: a byte string. The string's length in bytes is represented following the rules for positive integers (major type 0).

    MessagePack's documentation on the bin type family describes this type as:

    Bin format family stores a byte array in 2, 3, or 5 bytes of extra bytes in addition to the size of the byte array.

    BSON's specifications describe several binary types; however, this type is intended to represent the generic binary type which has the description:

    Generic binary subtype - This is the most commonly used binary subtype and should be the 'default' for drivers and tools.

    None of these impose any limitations on the internal representation other than the basic unit of storage be some type of array whose parts are decomposable into bytes.

    The default representation of this binary format is a std::vector<std::uint8_t>, which is a very common way to represent a byte array in modern C++.

    "},{"location":"api/basic_json/binary_t/#template-parameters","title":"Template parameters","text":"BinaryType container type to store arrays"},{"location":"api/basic_json/binary_t/#notes","title":"Notes","text":""},{"location":"api/basic_json/binary_t/#default-type","title":"Default type","text":"

    The default values for BinaryType is std::vector<std::uint8_t>.

    "},{"location":"api/basic_json/binary_t/#storage","title":"Storage","text":"

    Binary Arrays are stored as pointers in a basic_json type. That is, for any access to array values, a pointer of the type binary_t* must be dereferenced.

    "},{"location":"api/basic_json/binary_t/#notes-on-subtypes","title":"Notes on subtypes","text":"

    • CBOR

      • Binary values are represented as byte strings. Subtypes are written as tags.

    • MessagePack

      • If a subtype is given and the binary array contains exactly 1, 2, 4, 8, or 16 elements, the fixext family (fixext1, fixext2, fixext4, fixext8) is used. For other sizes, the ext family (ext8, ext16, ext32) is used. The subtype is then added as a signed 8-bit integer.
      • If no subtype is given, the bin family (bin8, bin16, bin32) is used.

    • BSON

      • If a subtype is given, it is used and added as an unsigned 8-bit integer.
      • If no subtype is given, the generic binary subtype 0x00 is used.
    "},{"location":"api/basic_json/binary_t/#examples","title":"Examples","text":"Example

    The following code shows that binary_t is by default, a typedef to nlohmann::byte_container_with_subtype<std::vector<std::uint8_t>>.

    #include <iostream>\n#include <iomanip>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    std::cout << std::boolalpha << std::is_same<nlohmann::byte_container_with_subtype<std::vector<std::uint8_t>>, json::binary_t>::value << std::endl;\n}\n

    Output:

    true\n
    "},{"location":"api/basic_json/binary_t/#see-also","title":"See also","text":"
    • byte_container_with_subtype
    "},{"location":"api/basic_json/binary_t/#version-history","title":"Version history","text":"
    • Added in version 3.8.0. Changed the type of subtype to std::uint64_t in version 3.10.0.
    "},{"location":"api/basic_json/boolean_t/","title":"nlohmann::basic_json::boolean_t","text":"
    using boolean_t = BooleanType;\n

    The type used to store JSON booleans.

    RFC 8259 implicitly describes a boolean as a type which differentiates the two literals true and false.

    To store objects in C++, a type is defined by the template parameter BooleanType which chooses the type to use.

    "},{"location":"api/basic_json/boolean_t/#notes","title":"Notes","text":""},{"location":"api/basic_json/boolean_t/#default-type","title":"Default type","text":"

    With the default values for BooleanType (bool), the default value for boolean_t is bool.

    "},{"location":"api/basic_json/boolean_t/#storage","title":"Storage","text":"

    Boolean values are stored directly inside a basic_json type.

    "},{"location":"api/basic_json/boolean_t/#examples","title":"Examples","text":"Example

    The following code shows that boolean_t is by default, a typedef to bool.

    #include <iostream>\n#include <iomanip>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    std::cout << std::boolalpha << std::is_same<bool, json::boolean_t>::value << std::endl;\n}\n

    Output:

    true\n
    "},{"location":"api/basic_json/boolean_t/#version-history","title":"Version history","text":"
    • Added in version 1.0.0.
    "},{"location":"api/basic_json/cbegin/","title":"nlohmann::basic_json::cbegin","text":"
    const_iterator cbegin() const noexcept;\n

    Returns an iterator to the first element.

    "},{"location":"api/basic_json/cbegin/#return-value","title":"Return value","text":"

    iterator to the first element

    "},{"location":"api/basic_json/cbegin/#exception-safety","title":"Exception safety","text":"

    No-throw guarantee: this member function never throws exceptions.

    "},{"location":"api/basic_json/cbegin/#complexity","title":"Complexity","text":"

    Constant.

    "},{"location":"api/basic_json/cbegin/#examples","title":"Examples","text":"Example

    The following code shows an example for cbegin().

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // create an array value\n    const json array = {1, 2, 3, 4, 5};\n\n    // get an iterator to the first element\n    json::const_iterator it = array.cbegin();\n\n    // serialize the element that the iterator points to\n    std::cout << *it << '\\n';\n}\n

    Output:

    1\n
    "},{"location":"api/basic_json/cbegin/#version-history","title":"Version history","text":"
    • Added in version 1.0.0.
    "},{"location":"api/basic_json/cbor_tag_handler_t/","title":"nlohmann::basic_json::cbor_tag_handler_t","text":"
    enum class cbor_tag_handler_t\n{\n    error,\n    ignore,\n    store\n};\n

    This enumeration is used in the from_cbor function to choose how to treat tags:

    error throw a parse_error exception in case of a tag ignore ignore tags store store tagged values as binary container with subtype (for bytes 0xd8..0xdb)"},{"location":"api/basic_json/cbor_tag_handler_t/#examples","title":"Examples","text":"Example

    The example below shows how the different values of the cbor_tag_handler_t influence the behavior of from_cbor when reading a tagged byte string.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // tagged byte string\n    std::vector<std::uint8_t> vec = {{0xd8, 0x42, 0x44, 0xcA, 0xfe, 0xba, 0xbe}};\n\n    // cbor_tag_handler_t::error throws\n    try\n    {\n        auto b_throw_on_tag = json::from_cbor(vec, true, true, json::cbor_tag_handler_t::error);\n    }\n    catch (const json::parse_error& e)\n    {\n        std::cout << e.what() << std::endl;\n    }\n\n    // cbor_tag_handler_t::ignore ignores the tag\n    auto b_ignore_tag = json::from_cbor(vec, true, true, json::cbor_tag_handler_t::ignore);\n    std::cout << b_ignore_tag << std::endl;\n\n    // cbor_tag_handler_t::store stores the tag as binary subtype\n    auto b_store_tag = json::from_cbor(vec, true, true, json::cbor_tag_handler_t::store);\n    std::cout << b_store_tag << std::endl;\n}\n

    Output:

    [json.exception.parse_error.112] parse error at byte 1: syntax error while parsing CBOR value: invalid byte: 0xD8\n{\"bytes\":[202,254,186,190],\"subtype\":null}\n{\"bytes\":[202,254,186,190],\"subtype\":66}\n
    "},{"location":"api/basic_json/cbor_tag_handler_t/#version-history","title":"Version history","text":"
    • Added in version 3.9.0. Added value store in 3.10.0.
    "},{"location":"api/basic_json/cend/","title":"nlohmann::basic_json::cend","text":"
    const_iterator cend() const noexcept;\n

    Returns an iterator to one past the last element.

    "},{"location":"api/basic_json/cend/#return-value","title":"Return value","text":"

    iterator one past the last element

    "},{"location":"api/basic_json/cend/#exception-safety","title":"Exception safety","text":"

    No-throw guarantee: this member function never throws exceptions.

    "},{"location":"api/basic_json/cend/#complexity","title":"Complexity","text":"

    Constant.

    "},{"location":"api/basic_json/cend/#examples","title":"Examples","text":"Example

    The following code shows an example for cend().

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // create an array value\n    json array = {1, 2, 3, 4, 5};\n\n    // get an iterator to one past the last element\n    json::const_iterator it = array.cend();\n\n    // decrement the iterator to point to the last element\n    --it;\n\n    // serialize the element that the iterator points to\n    std::cout << *it << '\\n';\n}\n

    Output:

    5\n
    "},{"location":"api/basic_json/cend/#version-history","title":"Version history","text":"
    • Added in version 1.0.0.
    "},{"location":"api/basic_json/clear/","title":"nlohmann::basic_json::clear","text":"
    void clear() noexcept;\n

    Clears the content of a JSON value and resets it to the default value as if basic_json(value_t) would have been called with the current value type from type():

    Value type initial value null null boolean false string \"\" number 0 binary An empty byte vector object {} array []

    Has the same effect as calling

    *this = basic_json(type());\n
    "},{"location":"api/basic_json/clear/#exception-safety","title":"Exception safety","text":"

    No-throw guarantee: this function never throws exceptions.

    "},{"location":"api/basic_json/clear/#complexity","title":"Complexity","text":"

    Linear in the size of the JSON value.

    "},{"location":"api/basic_json/clear/#notes","title":"Notes","text":"

    All iterators, pointers, and references related to this container are invalidated.

    "},{"location":"api/basic_json/clear/#examples","title":"Examples","text":"Example

    The example below shows the effect of clear() to different JSON types.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // create JSON values\n    json j_null;\n    json j_boolean = true;\n    json j_number_integer = 17;\n    json j_number_float = 23.42;\n    json j_object = {{\"one\", 1}, {\"two\", 2}};\n    json j_array = {1, 2, 4, 8, 16};\n    json j_string = \"Hello, world\";\n\n    // call clear()\n    j_null.clear();\n    j_boolean.clear();\n    j_number_integer.clear();\n    j_number_float.clear();\n    j_object.clear();\n    j_array.clear();\n    j_string.clear();\n\n    // serialize the cleared values()\n    std::cout << j_null << '\\n';\n    std::cout << j_boolean << '\\n';\n    std::cout << j_number_integer << '\\n';\n    std::cout << j_number_float << '\\n';\n    std::cout << j_object << '\\n';\n    std::cout << j_array << '\\n';\n    std::cout << j_string << '\\n';\n}\n

    Output:

    null\nfalse\n0\n0.0\n{}\n[]\n\"\"\n
    "},{"location":"api/basic_json/clear/#version-history","title":"Version history","text":"
    • Added in version 1.0.0.
    • Added support for binary types in version 3.8.0.
    "},{"location":"api/basic_json/contains/","title":"nlohmann::basic_json::contains","text":"
    // (1)\nbool contains(const typename object_t::key_type& key) const;\n\n// (2)\ntemplate<typename KeyType>\nbool contains(KeyType&& key) const;\n\n// (3)\nbool contains(const json_pointer& ptr) const;\n
    1. Check whether an element exists in a JSON object with a key equivalent to key. If the element is not found or the JSON value is not an object, false is returned.
    2. See 1. This overload is only available if KeyType is comparable with typename object_t::key_type and typename object_comparator_t::is_transparent denotes a type.
    3. Check whether the given JSON pointer ptr can be resolved in the current JSON value.
    "},{"location":"api/basic_json/contains/#template-parameters","title":"Template parameters","text":"KeyType A type for an object key other than json_pointer that is comparable with string_t using object_comparator_t. This can also be a string view (C++17)."},{"location":"api/basic_json/contains/#parameters","title":"Parameters","text":"key (in) key value to check its existence. ptr (in) JSON pointer to check its existence."},{"location":"api/basic_json/contains/#return-value","title":"Return value","text":"
    1. true if an element with specified key exists. If no such element with such a key is found or the JSON value is not an object, false is returned.
    2. See 1.
    3. true if the JSON pointer can be resolved to a stored value, false otherwise.
    "},{"location":"api/basic_json/contains/#exception-safety","title":"Exception safety","text":"

    Strong exception safety: if an exception occurs, the original value stays intact.

    "},{"location":"api/basic_json/contains/#exceptions","title":"Exceptions","text":"
    1. The function does not throw exceptions.
    2. The function does not throw exceptions.
    3. The function can throw the following exceptions:
      • Throws parse_error.106 if an array index begins with 0.
      • Throws parse_error.109 if an array index was not a number.
    "},{"location":"api/basic_json/contains/#complexity","title":"Complexity","text":"

    Logarithmic in the size of the JSON object.

    "},{"location":"api/basic_json/contains/#notes","title":"Notes","text":"
    • This method always returns false when executed on a JSON type that is not an object.
    • This method can be executed on any JSON value type.

    Postconditions

    If j.contains(x) returns true for a key or JSON pointer x, then it is safe to call j[x].

    "},{"location":"api/basic_json/contains/#examples","title":"Examples","text":"Example: (1) check with key

    The example shows how contains() is used.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\nusing namespace nlohmann::literals;\n\nint main()\n{\n    // create some JSON values\n    json j_object = R\"( {\"key\": \"value\"} )\"_json;\n    json j_array = R\"( [1, 2, 3] )\"_json;\n\n    // call contains\n    std::cout << std::boolalpha <<\n              \"j_object contains 'key': \" << j_object.contains(\"key\") << '\\n' <<\n              \"j_object contains 'another': \" << j_object.contains(\"another\") << '\\n' <<\n              \"j_array contains 'key': \" << j_array.contains(\"key\") << std::endl;\n}\n

    Output:

    j_object contains 'key': true\nj_object contains 'another': false\nj_array contains 'key': false\n
    Example: (2) check with key using string_view

    The example shows how contains() is used.

    #include <iostream>\n#include <string_view>\n#include <nlohmann/json.hpp>\n\nusing namespace std::string_view_literals;\nusing json = nlohmann::json;\nusing namespace nlohmann::literals;\n\nint main()\n{\n    // create some JSON values\n    json j_object = R\"( {\"key\": \"value\"} )\"_json;\n    json j_array = R\"( [1, 2, 3] )\"_json;\n\n    // call contains\n    std::cout << std::boolalpha <<\n              \"j_object contains 'key': \" << j_object.contains(\"key\"sv) << '\\n' <<\n              \"j_object contains 'another': \" << j_object.contains(\"another\"sv) << '\\n' <<\n              \"j_array contains 'key': \" << j_array.contains(\"key\"sv) << std::endl;\n}\n

    Output:

    j_object contains 'key': true\nj_object contains 'another': false\nj_array contains 'key': false\n
    Example: (3) check with JSON pointer

    The example shows how contains() is used.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\nusing namespace nlohmann::literals;\n\nint main()\n{\n    // create a JSON value\n    json j =\n    {\n        {\"number\", 1}, {\"string\", \"foo\"}, {\"array\", {1, 2}}\n    };\n\n    std::cout << std::boolalpha\n              << j.contains(\"/number\"_json_pointer) << '\\n'\n              << j.contains(\"/string\"_json_pointer) << '\\n'\n              << j.contains(\"/array\"_json_pointer) << '\\n'\n              << j.contains(\"/array/1\"_json_pointer) << '\\n'\n              << j.contains(\"/array/-\"_json_pointer) << '\\n'\n              << j.contains(\"/array/4\"_json_pointer) << '\\n'\n              << j.contains(\"/baz\"_json_pointer) << std::endl;\n\n    try\n    {\n        // try to use an array index with leading '0'\n        j.contains(\"/array/01\"_json_pointer);\n    }\n    catch (const json::parse_error& e)\n    {\n        std::cout << e.what() << '\\n';\n    }\n\n    try\n    {\n        // try to use an array index that is not a number\n        j.contains(\"/array/one\"_json_pointer);\n    }\n    catch (const json::parse_error& e)\n    {\n        std::cout << e.what() << '\\n';\n    }\n}\n

    Output:

    true\ntrue\ntrue\ntrue\nfalse\nfalse\nfalse\n
    "},{"location":"api/basic_json/contains/#version-history","title":"Version history","text":"
    1. Added in version 3.11.0.
    2. Added in version 3.6.0. Extended template KeyType to support comparable types in version 3.11.0.
    3. Added in version 3.7.0.
    "},{"location":"api/basic_json/count/","title":"nlohmann::basic_json::count","text":"
    // (1)\nsize_type count(const typename object_t::key_type& key) const;\n\n// (2)\ntemplate<typename KeyType>\nsize_type count(KeyType&& key) const;\n
    1. Returns the number of elements with key key. If ObjectType is the default std::map type, the return value will always be 0 (key was not found) or 1 (key was found).
    2. See 1. This overload is only available if KeyType is comparable with typename object_t::key_type and typename object_comparator_t::is_transparent denotes a type.
    "},{"location":"api/basic_json/count/#template-parameters","title":"Template parameters","text":"KeyType A type for an object key other than json_pointer that is comparable with string_t using object_comparator_t. This can also be a string view (C++17)."},{"location":"api/basic_json/count/#parameters","title":"Parameters","text":"key (in) key value of the element to count."},{"location":"api/basic_json/count/#return-value","title":"Return value","text":"

    Number of elements with key key. If the JSON value is not an object, the return value will be 0.

    "},{"location":"api/basic_json/count/#exception-safety","title":"Exception safety","text":"

    Strong exception safety: if an exception occurs, the original value stays intact.

    "},{"location":"api/basic_json/count/#complexity","title":"Complexity","text":"

    Logarithmic in the size of the JSON object.

    "},{"location":"api/basic_json/count/#notes","title":"Notes","text":"

    This method always returns 0 when executed on a JSON type that is not an object.

    "},{"location":"api/basic_json/count/#examples","title":"Examples","text":"Example: (1) count number of elements

    The example shows how count() is used.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // create a JSON object\n    json j_object = {{\"one\", 1}, {\"two\", 2}};\n\n    // call count()\n    auto count_two = j_object.count(\"two\");\n    auto count_three = j_object.count(\"three\");\n\n    // print values\n    std::cout << \"number of elements with key \\\"two\\\": \" << count_two << '\\n';\n    std::cout << \"number of elements with key \\\"three\\\": \" << count_three << '\\n';\n}\n

    Output:

    number of elements with key \"two\": 1\nnumber of elements with key \"three\": 0\n
    Example: (2) count number of elements using string_view

    The example shows how count() is used.

    #include <iostream>\n#include <string_view>\n#include <nlohmann/json.hpp>\n\nusing namespace std::string_view_literals;\nusing json = nlohmann::json;\n\nint main()\n{\n    // create a JSON object\n    json j_object = {{\"one\", 1}, {\"two\", 2}};\n\n    // call count()\n    auto count_two = j_object.count(\"two\"sv);\n    auto count_three = j_object.count(\"three\"sv);\n\n    // print values\n    std::cout << \"number of elements with key \\\"two\\\": \" << count_two << '\\n';\n    std::cout << \"number of elements with key \\\"three\\\": \" << count_three << '\\n';\n}\n

    Output:

    number of elements with key \"two\": 1\nnumber of elements with key \"three\": 0\n
    "},{"location":"api/basic_json/count/#version-history","title":"Version history","text":"
    1. Added in version 3.11.0.
    2. Added in version 1.0.0. Changed parameter key type to KeyType&& in version 3.11.0.
    "},{"location":"api/basic_json/crbegin/","title":"nlohmann::basic_json::crbegin","text":"
    const_reverse_iterator crbegin() const noexcept;\n

    Returns an iterator to the reverse-beginning; that is, the last element.

    "},{"location":"api/basic_json/crbegin/#return-value","title":"Return value","text":"

    reverse iterator to the first element

    "},{"location":"api/basic_json/crbegin/#exception-safety","title":"Exception safety","text":"

    No-throw guarantee: this member function never throws exceptions.

    "},{"location":"api/basic_json/crbegin/#complexity","title":"Complexity","text":"

    Constant.

    "},{"location":"api/basic_json/crbegin/#examples","title":"Examples","text":"Example

    The following code shows an example for crbegin().

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // create an array value\n    json array = {1, 2, 3, 4, 5};\n\n    // get an iterator to the reverse-beginning\n    json::const_reverse_iterator it = array.crbegin();\n\n    // serialize the element that the iterator points to\n    std::cout << *it << '\\n';\n}\n

    Output:

    5\n
    "},{"location":"api/basic_json/crbegin/#version-history","title":"Version history","text":"
    • Added in version 1.0.0.
    "},{"location":"api/basic_json/crend/","title":"nlohmann::basic_json::crend","text":"
    const_reverse_iterator crend() const noexcept;\n

    Returns an iterator to the reverse-end; that is, one before the first element. This element acts as a placeholder, attempting to access it results in undefined behavior.

    "},{"location":"api/basic_json/crend/#return-value","title":"Return value","text":"

    reverse iterator to the element following the last element

    "},{"location":"api/basic_json/crend/#exception-safety","title":"Exception safety","text":"

    No-throw guarantee: this member function never throws exceptions.

    "},{"location":"api/basic_json/crend/#complexity","title":"Complexity","text":"

    Constant.

    "},{"location":"api/basic_json/crend/#examples","title":"Examples","text":"Example

    The following code shows an example for eend().

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // create an array value\n    json array = {1, 2, 3, 4, 5};\n\n    // get an iterator to the reverse-end\n    json::const_reverse_iterator it = array.crend();\n\n    // increment the iterator to point to the first element\n    --it;\n\n    // serialize the element that the iterator points to\n    std::cout << *it << '\\n';\n}\n

    Output:

    1\n
    "},{"location":"api/basic_json/crend/#version-history","title":"Version history","text":"
    • Added in version 1.0.0.
    "},{"location":"api/basic_json/default_object_comparator_t/","title":"nlohmann::basic_json::default_object_comparator_t","text":"
    using default_object_comparator_t = std::less<StringType>;  // until C++14\n\nusing default_object_comparator_t = std::less<>;            // since C++14\n

    The default comparator used by object_t.

    Since C++14 a transparent comparator is used which prevents unnecessary string construction when looking up a key in an object.

    The actual comparator used depends on object_t and can be obtained via object_comparator_t.

    "},{"location":"api/basic_json/default_object_comparator_t/#examples","title":"Examples","text":"Example

    The example below demonstrates the default comparator.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    std::cout << std::boolalpha\n              << \"one < two : \" << json::default_object_comparator_t{}(\"one\", \"two\") << \"\\n\"\n              << \"three < four : \" << json::default_object_comparator_t{}(\"three\", \"four\") << std::endl;\n}\n

    Output:

    one < two : true\nthree < four : false\n
    "},{"location":"api/basic_json/default_object_comparator_t/#version-history","title":"Version history","text":"
    • Added in version 3.11.0.
    "},{"location":"api/basic_json/diff/","title":"nlohmann::basic_json::diff","text":"
    static basic_json diff(const basic_json& source,\n                       const basic_json& target);\n

    Creates a JSON Patch so that value source can be changed into the value target by calling patch function.

    For two JSON values source and target, the following code yields always true: 

    source.patch(diff(source, target)) == target;\n

    "},{"location":"api/basic_json/diff/#parameters","title":"Parameters","text":"source (in) JSON value to compare from target (in) JSON value to compare against"},{"location":"api/basic_json/diff/#return-value","title":"Return value","text":"

    a JSON patch to convert the source to target

    "},{"location":"api/basic_json/diff/#exception-safety","title":"Exception safety","text":"

    Strong guarantee: if an exception is thrown, there are no changes in the JSON value.

    "},{"location":"api/basic_json/diff/#complexity","title":"Complexity","text":"

    Linear in the lengths of source and target.

    "},{"location":"api/basic_json/diff/#notes","title":"Notes","text":"

    Currently, only remove, add, and replace operations are generated.

    "},{"location":"api/basic_json/diff/#examples","title":"Examples","text":"Example

    The following code shows how a JSON patch is created as a diff for two JSON values.

    #include <iostream>\n#include <iomanip>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\nusing namespace nlohmann::literals;\n\nint main()\n{\n    // the source document\n    json source = R\"(\n        {\n            \"baz\": \"qux\",\n            \"foo\": \"bar\"\n        }\n    )\"_json;\n\n    // the target document\n    json target = R\"(\n        {\n            \"baz\": \"boo\",\n            \"hello\": [\n                \"world\"\n            ]\n        }\n    )\"_json;\n\n    // create the patch\n    json patch = json::diff(source, target);\n\n    // roundtrip\n    json patched_source = source.patch(patch);\n\n    // output patch and roundtrip result\n    std::cout << std::setw(4) << patch << \"\\n\\n\"\n              << std::setw(4) << patched_source << std::endl;\n}\n

    Output:

    [\n    {\n        \"op\": \"replace\",\n        \"path\": \"/baz\",\n        \"value\": \"boo\"\n    },\n    {\n        \"op\": \"remove\",\n        \"path\": \"/foo\"\n    },\n    {\n        \"op\": \"add\",\n        \"path\": \"/hello\",\n        \"value\": [\n            \"world\"\n        ]\n    }\n]\n\n{\n    \"baz\": \"boo\",\n    \"hello\": [\n        \"world\"\n    ]\n}\n
    "},{"location":"api/basic_json/diff/#see-also","title":"See also","text":"
    • RFC 6902 (JSON Patch)
    "},{"location":"api/basic_json/diff/#version-history","title":"Version history","text":"
    • Added in version 2.0.0.
    "},{"location":"api/basic_json/dump/","title":"nlohmann::basic_json::dump","text":"
    string_t dump(const int indent = -1,\n              const char indent_char = ' ',\n              const bool ensure_ascii = false,\n              const error_handler_t error_handler = error_handler_t::strict) const;\n

    Serialization function for JSON values. The function tries to mimic Python's json.dumps() function, and currently supports its indent and ensure_ascii parameters.

    "},{"location":"api/basic_json/dump/#parameters","title":"Parameters","text":"indent (in) If indent is nonnegative, then array elements and object members will be pretty-printed with that indent level. An indent level of 0 will only insert newlines. -1 (the default) selects the most compact representation. indent_char (in) The character to use for indentation if indent is greater than 0. The default is (space). ensure_ascii (in) If ensure_ascii is true, all non-ASCII characters in the output are escaped with \\uXXXX sequences, and the result consists of ASCII characters only. error_handler (in) how to react on decoding errors; there are three possible values (see error_handler_t: strict (throws and exception in case a decoding error occurs; default), replace (replace invalid UTF-8 sequences with U+FFFD), and ignore (ignore invalid UTF-8 sequences during serialization; all bytes are copied to the output unchanged))."},{"location":"api/basic_json/dump/#return-value","title":"Return value","text":"

    string containing the serialization of the JSON value

    "},{"location":"api/basic_json/dump/#exception-safety","title":"Exception safety","text":"

    Strong guarantee: if an exception is thrown, there are no changes to any JSON value.

    "},{"location":"api/basic_json/dump/#exceptions","title":"Exceptions","text":"

    Throws type_error.316 if a string stored inside the JSON value is not UTF-8 encoded and error_handler is set to strict

    "},{"location":"api/basic_json/dump/#complexity","title":"Complexity","text":"

    Linear.

    "},{"location":"api/basic_json/dump/#notes","title":"Notes","text":"

    Binary values are serialized as an object containing two keys:

    • \"bytes\": an array of bytes as integers
    • \"subtype\": the subtype as integer or null if the binary has no subtype
    "},{"location":"api/basic_json/dump/#examples","title":"Examples","text":"Example

    The following example shows the effect of different indent, indent_char, and ensure_ascii parameters to the result of the serialization.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // create JSON values\n    json j_object = {{\"one\", 1}, {\"two\", 2}};\n    json j_array = {1, 2, 4, 8, 16};\n    json j_string = \"Hell\u00f6 \ud83d\ude00!\";\n\n    // call dump()\n    std::cout << \"objects:\" << '\\n'\n              << j_object.dump() << \"\\n\\n\"\n              << j_object.dump(-1) << \"\\n\\n\"\n              << j_object.dump(0) << \"\\n\\n\"\n              << j_object.dump(4) << \"\\n\\n\"\n              << j_object.dump(1, '\\t') << \"\\n\\n\";\n\n    std::cout << \"arrays:\" << '\\n'\n              << j_array.dump() << \"\\n\\n\"\n              << j_array.dump(-1) << \"\\n\\n\"\n              << j_array.dump(0) << \"\\n\\n\"\n              << j_array.dump(4) << \"\\n\\n\"\n              << j_array.dump(1, '\\t') << \"\\n\\n\";\n\n    std::cout << \"strings:\" << '\\n'\n              << j_string.dump() << '\\n'\n              << j_string.dump(-1, ' ', true) << '\\n';\n\n    // create JSON value with invalid UTF-8 byte sequence\n    json j_invalid = \"\u00e4\\xA9\u00fc\";\n    try\n    {\n        std::cout << j_invalid.dump() << std::endl;\n    }\n    catch (const json::type_error& e)\n    {\n        std::cout << e.what() << std::endl;\n    }\n\n    std::cout << \"string with replaced invalid characters: \"\n              << j_invalid.dump(-1, ' ', false, json::error_handler_t::replace)\n              << \"\\nstring with ignored invalid characters: \"\n              << j_invalid.dump(-1, ' ', false, json::error_handler_t::ignore)\n              << '\\n';\n}\n

    Output:

    objects:\n{\"one\":1,\"two\":2}\n\n{\"one\":1,\"two\":2}\n\n{\n\"one\": 1,\n\"two\": 2\n}\n\n{\n    \"one\": 1,\n    \"two\": 2\n}\n\n{\n    \"one\": 1,\n    \"two\": 2\n}\n\narrays:\n[1,2,4,8,16]\n\n[1,2,4,8,16]\n\n[\n1,\n2,\n4,\n8,\n16\n]\n\n[\n    1,\n    2,\n    4,\n    8,\n    16\n]\n\n[\n    1,\n    2,\n    4,\n    8,\n    16\n]\n\nstrings:\n\"Hell\u00f6 \ud83d\ude00!\"\n\"Hell\\u00f6 \\ud83d\\ude00!\"\n[json.exception.type_error.316] invalid UTF-8 byte at index 2: 0xA9\nstring with replaced invalid characters: \"\u00e4\ufffd\u00fc\"\nstring with ignored invalid characters: \"\u00e4\u00fc\"\n
    "},{"location":"api/basic_json/dump/#version-history","title":"Version history","text":"
    • Added in version 1.0.0.
    • Indentation character indent_char, option ensure_ascii and exceptions added in version 3.0.0.
    • Error handlers added in version 3.4.0.
    • Serialization of binary values added in version 3.8.0.
    "},{"location":"api/basic_json/emplace/","title":"nlohmann::basic_json::emplace","text":"
    template<class... Args>\nstd::pair<iterator, bool> emplace(Args&& ... args);\n

    Inserts a new element into a JSON object constructed in-place with the given args if there is no element with the key in the container. If the function is called on a JSON null value, an empty object is created before appending the value created from args.

    "},{"location":"api/basic_json/emplace/#template-parameters","title":"Template parameters","text":"Args compatible types to create a basic_json object"},{"location":"api/basic_json/emplace/#iterator-invalidation","title":"Iterator invalidation","text":"

    For ordered_json, adding a value to an object can yield a reallocation, in which case all iterators (including the end() iterator) and all references to the elements are invalidated.

    "},{"location":"api/basic_json/emplace/#parameters","title":"Parameters","text":"args (in) arguments to forward to a constructor of basic_json"},{"location":"api/basic_json/emplace/#return-value","title":"Return value","text":"

    a pair consisting of an iterator to the inserted element, or the already-existing element if no insertion happened, and a bool denoting whether the insertion took place.

    "},{"location":"api/basic_json/emplace/#exceptions","title":"Exceptions","text":"

    Throws type_error.311 when called on a type other than JSON object or null; example: \"cannot use emplace() with number\"

    "},{"location":"api/basic_json/emplace/#complexity","title":"Complexity","text":"

    Logarithmic in the size of the container, O(log(size())).

    "},{"location":"api/basic_json/emplace/#examples","title":"Examples","text":"Example

    The example shows how emplace() can be used to add elements to a JSON object. Note how the null value was silently converted to a JSON object. Further note how no value is added if there was already one value stored with the same key.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // create JSON values\n    json object = {{\"one\", 1}, {\"two\", 2}};\n    json null;\n\n    // print values\n    std::cout << object << '\\n';\n    std::cout << null << '\\n';\n\n    // add values\n    auto res1 = object.emplace(\"three\", 3);\n    null.emplace(\"A\", \"a\");\n    null.emplace(\"B\", \"b\");\n\n    // the following call will not add an object, because there is already\n    // a value stored at key \"B\"\n    auto res2 = null.emplace(\"B\", \"c\");\n\n    // print values\n    std::cout << object << '\\n';\n    std::cout << *res1.first << \" \" << std::boolalpha << res1.second << '\\n';\n\n    std::cout << null << '\\n';\n    std::cout << *res2.first << \" \" << std::boolalpha << res2.second << '\\n';\n}\n

    Output:

    {\"one\":1,\"two\":2}\nnull\n{\"one\":1,\"three\":3,\"two\":2}\n3 true\n{\"A\":\"a\",\"B\":\"b\"}\n\"b\" false\n
    "},{"location":"api/basic_json/emplace/#version-history","title":"Version history","text":"
    • Since version 2.0.8.
    "},{"location":"api/basic_json/emplace_back/","title":"nlohmann::basic_json::emplace_back","text":"
    template<class... Args>\nreference emplace_back(Args&& ... args);\n

    Creates a JSON value from the passed parameters args to the end of the JSON value. If the function is called on a JSON null value, an empty array is created before appending the value created from args.

    "},{"location":"api/basic_json/emplace_back/#template-parameters","title":"Template parameters","text":"Args compatible types to create a basic_json object"},{"location":"api/basic_json/emplace_back/#iterator-invalidation","title":"Iterator invalidation","text":"

    By adding an element to the end of the array, a reallocation can happen, in which case all iterators (including the end() iterator) and all references to the elements are invalidated. Otherwise, only the end() iterator is invalidated.

    "},{"location":"api/basic_json/emplace_back/#parameters","title":"Parameters","text":"args (in) arguments to forward to a constructor of basic_json"},{"location":"api/basic_json/emplace_back/#return-value","title":"Return value","text":"

    reference to the inserted element

    "},{"location":"api/basic_json/emplace_back/#exceptions","title":"Exceptions","text":"

    Throws type_error.311 when called on a type other than JSON array or null; example: \"cannot use emplace_back() with number\"

    "},{"location":"api/basic_json/emplace_back/#complexity","title":"Complexity","text":"

    Amortized constant.

    "},{"location":"api/basic_json/emplace_back/#examples","title":"Examples","text":"Example

    The example shows how emplace_back() can be used to add elements to a JSON array. Note how the null value was silently converted to a JSON array.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // create JSON values\n    json array = {1, 2, 3, 4, 5};\n    json null;\n\n    // print values\n    std::cout << array << '\\n';\n    std::cout << null << '\\n';\n\n    // add values\n    array.emplace_back(6);\n    null.emplace_back(\"first\");\n    null.emplace_back(3, \"second\");\n\n    // print values\n    std::cout << array << '\\n';\n    std::cout << null << '\\n';\n}\n

    Output:

    [1,2,3,4,5]\nnull\n[1,2,3,4,5,6]\n[\"first\",[\"second\",\"second\",\"second\"]]\n
    "},{"location":"api/basic_json/emplace_back/#see-also","title":"See also","text":"
    • operator+= add a value to an array/object
    • push_back add a value to an array/object
    "},{"location":"api/basic_json/emplace_back/#version-history","title":"Version history","text":"
    • Since version 2.0.8.
    • Returns reference since 3.7.0.
    "},{"location":"api/basic_json/empty/","title":"nlohmann::basic_json::empty","text":"
    bool empty() const noexcept;\n

    Checks if a JSON value has no elements (i.e., whether its size() is 0).

    "},{"location":"api/basic_json/empty/#return-value","title":"Return value","text":"

    The return value depends on the different types and is defined as follows:

    Value type return value null true boolean false string false number false binary false object result of function object_t::empty() array result of function array_t::empty()"},{"location":"api/basic_json/empty/#exception-safety","title":"Exception safety","text":"

    No-throw guarantee: this function never throws exceptions.

    "},{"location":"api/basic_json/empty/#complexity","title":"Complexity","text":"

    Constant, as long as array_t and object_t satisfy the Container concept; that is, their empty() functions have constant complexity.

    "},{"location":"api/basic_json/empty/#possible-implementation","title":"Possible implementation","text":"
    bool empty() const noexcept\n{\n    return size() == 0;\n}\n
    "},{"location":"api/basic_json/empty/#notes","title":"Notes","text":"

    This function does not return whether a string stored as JSON value is empty -- it returns whether the JSON container itself is empty which is false in the case of a string.

    "},{"location":"api/basic_json/empty/#examples","title":"Examples","text":"Example

    The following code uses empty() to check if a JSON object contains any elements.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // create JSON values\n    json j_null;\n    json j_boolean = true;\n    json j_number_integer = 17;\n    json j_number_float = 23.42;\n    json j_object = {{\"one\", 1}, {\"two\", 2}};\n    json j_object_empty(json::value_t::object);\n    json j_array = {1, 2, 4, 8, 16};\n    json j_array_empty(json::value_t::array);\n    json j_string = \"Hello, world\";\n\n    // call empty()\n    std::cout << std::boolalpha;\n    std::cout << j_null.empty() << '\\n';\n    std::cout << j_boolean.empty() << '\\n';\n    std::cout << j_number_integer.empty() << '\\n';\n    std::cout << j_number_float.empty() << '\\n';\n    std::cout << j_object.empty() << '\\n';\n    std::cout << j_object_empty.empty() << '\\n';\n    std::cout << j_array.empty() << '\\n';\n    std::cout << j_array_empty.empty() << '\\n';\n    std::cout << j_string.empty() << '\\n';\n}\n

    Output:

    true\nfalse\nfalse\nfalse\nfalse\ntrue\nfalse\ntrue\nfalse\n
    "},{"location":"api/basic_json/empty/#version-history","title":"Version history","text":"
    • Added in version 1.0.0.
    • Extended to return false for binary types in version 3.8.0.
    "},{"location":"api/basic_json/end/","title":"nlohmann::basic_json::end","text":"
    iterator end() noexcept;\nconst_iterator end() const noexcept;\n

    Returns an iterator to one past the last element.

    "},{"location":"api/basic_json/end/#return-value","title":"Return value","text":"

    iterator one past the last element

    "},{"location":"api/basic_json/end/#exception-safety","title":"Exception safety","text":"

    No-throw guarantee: this member function never throws exceptions.

    "},{"location":"api/basic_json/end/#complexity","title":"Complexity","text":"

    Constant.

    "},{"location":"api/basic_json/end/#examples","title":"Examples","text":"Example

    The following code shows an example for end().

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // create an array value\n    json array = {1, 2, 3, 4, 5};\n\n    // get an iterator to one past the last element\n    json::iterator it = array.end();\n\n    // decrement the iterator to point to the last element\n    --it;\n\n    // serialize the element that the iterator points to\n    std::cout << *it << '\\n';\n}\n

    Output:

    5\n
    "},{"location":"api/basic_json/end/#version-history","title":"Version history","text":"
    • Added in version 1.0.0.
    "},{"location":"api/basic_json/end_pos/","title":"nlohmann::basic_json::end_pos","text":"
    #if JSON_DIAGNOSTIC_POSITIONS\nconstexpr std::size_t end_pos() const noexcept;\n#endif\n

    Returns the position immediately following the last character of the JSON string from which the value was parsed from.

    JSON type return value object position after the closing } array position after the closing ] string position after the closing \" number position after the last character boolean position after e null position after l"},{"location":"api/basic_json/end_pos/#return-value","title":"Return value","text":"

    the position of the character following the last character of the given value in the parsed JSON string, if the value was created by the parse function, or std::string::npos if the value was constructed otherwise

    "},{"location":"api/basic_json/end_pos/#exception-safety","title":"Exception safety","text":"

    No-throw guarantee: this member function never throws exceptions.

    "},{"location":"api/basic_json/end_pos/#complexity","title":"Complexity","text":"

    Constant.

    "},{"location":"api/basic_json/end_pos/#notes","title":"Notes","text":"

    Note

    The function is only available if macro JSON_DIAGNOSTIC_POSITIONS has been defined to 1 before including the library header.

    Invalidation

    The returned positions are only valid as long as the JSON value is not changed. The positions are not updated when the JSON value is changed.

    "},{"location":"api/basic_json/end_pos/#examples","title":"Examples","text":"Example 
    #include <iostream>\n\n#define JSON_DIAGNOSTIC_POSITIONS 1\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    std::string json_string = R\"(\n    {\n        \"address\": {\n            \"street\": \"Fake Street\",\n            \"housenumber\": 1\n        }\n    }\n    )\";\n    json j = json::parse(json_string);\n\n    std::cout << \"Root diagnostic positions: \\n\";\n    std::cout << \"\\tstart_pos: \" << j.start_pos() << '\\n';\n    std::cout << \"\\tend_pos:\" << j.end_pos() << \"\\n\";\n    std::cout << \"Original string: \\n\";\n    std::cout << \"{\\n        \\\"address\\\": {\\n            \\\"street\\\": \\\"Fake Street\\\",\\n            \\\"housenumber\\\": 1\\n        }\\n    }\" << \"\\n\";\n    std::cout << \"Parsed string: \\n\";\n    std::cout << json_string.substr(j.start_pos(), j.end_pos() - j.start_pos()) << \"\\n\\n\";\n\n    std::cout << \"address diagnostic positions: \\n\";\n    std::cout << \"\\tstart_pos:\" << j[\"address\"].start_pos() << '\\n';\n    std::cout << \"\\tend_pos:\" << j[\"address\"].end_pos() << \"\\n\\n\";\n    std::cout << \"Original string: \\n\";\n    std::cout << \"{            \\\"street\\\": \\\"Fake Street\\\",\\n            \\\"housenumber\\\": 1\\n        }\" << \"\\n\";\n    std::cout << \"Parsed string: \\n\";\n    std::cout << json_string.substr(j[\"address\"].start_pos(), j[\"address\"].end_pos() - j[\"address\"].start_pos()) << \"\\n\\n\";\n\n    std::cout << \"street diagnostic positions: \\n\";\n    std::cout << \"\\tstart_pos:\" << j[\"address\"][\"street\"].start_pos() << '\\n';\n    std::cout << \"\\tend_pos:\" << j[\"address\"][\"street\"].end_pos() << \"\\n\\n\";\n    std::cout << \"Original string: \\n\";\n    std::cout << \"\\\"Fake Street\\\"\" << \"\\n\";\n    std::cout << \"Parsed string: \\n\";\n    std::cout << json_string.substr(j[\"address\"][\"street\"].start_pos(), j[\"address\"][\"street\"].end_pos() - j[\"address\"][\"street\"].start_pos()) << \"\\n\\n\";\n\n    std::cout << \"housenumber diagnostic positions: \\n\";\n    std::cout << \"\\tstart_pos:\" << j[\"address\"][\"housenumber\"].start_pos() << '\\n';\n    std::cout << \"\\tend_pos:\" << j[\"address\"][\"housenumber\"].end_pos() << \"\\n\\n\";\n    std::cout << \"Original string: \\n\";\n    std::cout << \"1\" << \"\\n\";\n    std::cout << \"Parsed string: \\n\";\n    std::cout << json_string.substr(j[\"address\"][\"housenumber\"].start_pos(), j[\"address\"][\"housenumber\"].end_pos() - j[\"address\"][\"housenumber\"].start_pos()) << \"\\n\\n\";\n}\n

    Output:

    Root diagnostic positions: \n    start_pos: 5\n    end_pos:109\nOriginal string: \n{\n        \"address\": {\n            \"street\": \"Fake Street\",\n            \"housenumber\": 1\n        }\n    }\nParsed string: \n{\n        \"address\": {\n            \"street\": \"Fake Street\",\n            \"housenumber\": 1\n        }\n    }\n\naddress diagnostic positions: \n    start_pos:26\n    end_pos:103\n\nOriginal string: \n{            \"street\": \"Fake Street\",\n            \"housenumber\": 1\n        }\nParsed string: \n{\n            \"street\": \"Fake Street\",\n            \"housenumber\": 1\n        }\n\nstreet diagnostic positions: \n    start_pos:50\n    end_pos:63\n\nOriginal string: \n\"Fake Street\"\nParsed string: \n\"Fake Street\"\n\nhousenumber diagnostic positions: \n    start_pos:92\n    end_pos:93\n\nOriginal string: \n1\nParsed string: \n1\n

    The output shows the start/end positions of all the objects and fields in the JSON string.

    "},{"location":"api/basic_json/end_pos/#see-also","title":"See also","text":"
    • start_pos to access the start position
    • JSON_DIAGNOSTIC_POSITIONS for an overview of the diagnostic positions
    "},{"location":"api/basic_json/end_pos/#version-history","title":"Version history","text":"
    • Added in version 3.12.0.
    "},{"location":"api/basic_json/erase/","title":"nlohmann::basic_json::erase","text":"
    // (1)\niterator erase(iterator pos);\nconst_iterator erase(const_iterator pos);\n\n// (2)\niterator erase(iterator first, iterator last);\nconst_iterator erase(const_iterator first, const_iterator last);\n\n// (3)\nsize_type erase(const typename object_t::key_type& key);\n\n// (4)\ntemplate<typename KeyType>\nsize_type erase(KeyType&& key);\n\n// (5)\nvoid erase(const size_type idx);\n

    1. Removes an element from a JSON value specified by iterator pos. The iterator pos must be valid and dereferenceable. Thus, the end() iterator (which is valid, but is not dereferenceable) cannot be used as a value for pos.

      If called on a primitive type other than null, the resulting JSON value will be null.

    2. Remove an element range specified by [first; last) from a JSON value. The iterator first does not need to be dereferenceable if first == last: erasing an empty range is a no-op.

      If called on a primitive type other than null, the resulting JSON value will be null.

    3. Removes an element from a JSON object by key.

    4. See 3. This overload is only available if KeyType is comparable with typename object_t::key_type and typename object_comparator_t::is_transparent denotes a type.

    5. Removes an element from a JSON array by index.

    "},{"location":"api/basic_json/erase/#template-parameters","title":"Template parameters","text":"KeyType A type for an object key other than json_pointer that is comparable with string_t using object_comparator_t. This can also be a string view (C++17)."},{"location":"api/basic_json/erase/#parameters","title":"Parameters","text":"pos (in) iterator to the element to remove first (in) iterator to the beginning of the range to remove last (in) iterator past the end of the range to remove key (in) object key of the elements to remove idx (in) array index of the element to remove"},{"location":"api/basic_json/erase/#return-value","title":"Return value","text":"
    1. Iterator following the last removed element. If the iterator pos refers to the last element, the end() iterator is returned.
    2. Iterator following the last removed element. If the iterator last refers to the last element, the end() iterator is returned.
    3. Number of elements removed. If ObjectType is the default std::map type, the return value will always be 0 (key was not found) or 1 (key was found).
    4. See 3.
    5. (none)
    "},{"location":"api/basic_json/erase/#exception-safety","title":"Exception safety","text":"

    Strong exception safety: if an exception occurs, the original value stays intact.

    "},{"location":"api/basic_json/erase/#exceptions","title":"Exceptions","text":"
    1. The function can throw the following exceptions:
      • Throws type_error.307 if called on a null value; example: \"cannot use erase() with null\"
      • Throws invalid_iterator.202 if called on an iterator which does not belong to the current JSON value; example: \"iterator does not fit current value\"
      • Throws invalid_iterator.205 if called on a primitive type with invalid iterator (i.e., any iterator which is not begin()); example: \"iterator out of range\"
    2. The function can throw the following exceptions:
      • Throws type_error.307 if called on a null value; example: \"cannot use erase() with null\"
      • Throws invalid_iterator.203 if called on iterators which does not belong to the current JSON value; example: \"iterators do not fit current value\"
      • Throws invalid_iterator.204 if called on a primitive type with invalid iterators (i.e., if first != begin() and last != end()); example: \"iterators out of range\"
    3. The function can throw the following exceptions:
      • Throws type_error.307 when called on a type other than JSON object; example: \"cannot use erase() with null\"
    4. See 3.
    5. The function can throw the following exceptions:
      • Throws type_error.307 when called on a type other than JSON object; example: \"cannot use erase() with null\"
      • Throws out_of_range.401 when idx >= size(); example: \"array index 17 is out of range\"
    "},{"location":"api/basic_json/erase/#complexity","title":"Complexity","text":"
    1. The complexity depends on the type:
      • objects: amortized constant
      • arrays: linear in distance between pos and the end of the container
      • strings and binary: linear in the length of the member
      • other types: constant
    2. The complexity depends on the type:
      • objects: log(size()) + std::distance(first, last)
      • arrays: linear in the distance between first and last, plus linear in the distance between last and end of the container
      • strings and binary: linear in the length of the member
      • other types: constant
    3. log(size()) + count(key)
    4. log(size()) + count(key)
    5. Linear in distance between idx and the end of the container.
    "},{"location":"api/basic_json/erase/#notes","title":"Notes","text":"
    1. Invalidates iterators and references at or after the point of the erase, including the end() iterator.
    2. (none)
    3. References and iterators to the erased elements are invalidated. Other references and iterators are not affected.
    4. See 3.
    5. (none)
    "},{"location":"api/basic_json/erase/#examples","title":"Examples","text":"Example: (1) remove element given an iterator

    The example shows the effect of erase() for different JSON types using an iterator.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // create JSON values\n    json j_boolean = true;\n    json j_number_integer = 17;\n    json j_number_float = 23.42;\n    json j_object = {{\"one\", 1}, {\"two\", 2}};\n    json j_array = {1, 2, 4, 8, 16};\n    json j_string = \"Hello, world\";\n\n    // call erase()\n    j_boolean.erase(j_boolean.begin());\n    j_number_integer.erase(j_number_integer.begin());\n    j_number_float.erase(j_number_float.begin());\n    j_object.erase(j_object.find(\"two\"));\n    j_array.erase(j_array.begin() + 2);\n    j_string.erase(j_string.begin());\n\n    // print values\n    std::cout << j_boolean << '\\n';\n    std::cout << j_number_integer << '\\n';\n    std::cout << j_number_float << '\\n';\n    std::cout << j_object << '\\n';\n    std::cout << j_array << '\\n';\n    std::cout << j_string << '\\n';\n}\n

    Output:

    null\nnull\nnull\n{\"one\":1}\n[1,2,8,16]\nnull\n
    Example: (2) remove elements given an iterator range

    The example shows the effect of erase() for different JSON types using an iterator range.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // create JSON values\n    json j_boolean = true;\n    json j_number_integer = 17;\n    json j_number_float = 23.42;\n    json j_object = {{\"one\", 1}, {\"two\", 2}};\n    json j_array = {1, 2, 4, 8, 16};\n    json j_string = \"Hello, world\";\n\n    // call erase()\n    j_boolean.erase(j_boolean.begin(), j_boolean.end());\n    j_number_integer.erase(j_number_integer.begin(), j_number_integer.end());\n    j_number_float.erase(j_number_float.begin(), j_number_float.end());\n    j_object.erase(j_object.find(\"two\"), j_object.end());\n    j_array.erase(j_array.begin() + 1, j_array.begin() + 3);\n    j_string.erase(j_string.begin(), j_string.end());\n\n    // print values\n    std::cout << j_boolean << '\\n';\n    std::cout << j_number_integer << '\\n';\n    std::cout << j_number_float << '\\n';\n    std::cout << j_object << '\\n';\n    std::cout << j_array << '\\n';\n    std::cout << j_string << '\\n';\n}\n

    Output:

    null\nnull\nnull\n{\"one\":1}\n[1,8,16]\nnull\n
    Example: (3) remove element from a JSON object given a key

    The example shows the effect of erase() for different JSON types using an object key.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // create a JSON object\n    json j_object = {{\"one\", 1}, {\"two\", 2}};\n\n    // call erase()\n    auto count_one = j_object.erase(\"one\");\n    auto count_three = j_object.erase(\"three\");\n\n    // print values\n    std::cout << j_object << '\\n';\n    std::cout << count_one << \" \" << count_three << '\\n';\n}\n

    Output:

    {\"two\":2}\n1 0\n
    Example: (4) remove element from a JSON object given a key using string_view

    The example shows the effect of erase() for different JSON types using an object key.

    #include <iostream>\n#include <string_view>\n#include <nlohmann/json.hpp>\n\nusing namespace std::string_view_literals;\nusing json = nlohmann::json;\n\nint main()\n{\n    // create a JSON object\n    json j_object = {{\"one\", 1}, {\"two\", 2}};\n\n    // call erase()\n    auto count_one = j_object.erase(\"one\"sv);\n    auto count_three = j_object.erase(\"three\"sv);\n\n    // print values\n    std::cout << j_object << '\\n';\n    std::cout << count_one << \" \" << count_three << '\\n';\n}\n

    Output:

    {\"two\":2}\n1 0\n
    Example: (5) remove element from a JSON array given an index

    The example shows the effect of erase() using an array index.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // create a JSON array\n    json j_array = {0, 1, 2, 3, 4, 5};\n\n    // call erase()\n    j_array.erase(2);\n\n    // print values\n    std::cout << j_array << '\\n';\n}\n

    Output:

    [0,1,3,4,5]\n
    "},{"location":"api/basic_json/erase/#version-history","title":"Version history","text":"
    1. Added in version 1.0.0. Added support for binary types in version 3.8.0.
    2. Added in version 1.0.0. Added support for binary types in version 3.8.0.
    3. Added in version 1.0.0.
    4. Added in version 3.11.0.
    5. Added in version 1.0.0.
    "},{"location":"api/basic_json/error_handler_t/","title":"nlohmann::basic_json::error_handler_t","text":"
    enum class error_handler_t {\n    strict,\n    replace,\n    ignore\n};\n

    This enumeration is used in the dump function to choose how to treat decoding errors while serializing a basic_json value. Three values are differentiated:

    strict throw a type_error exception in case of invalid UTF-8 replace replace invalid UTF-8 sequences with U+FFFD (\ufffd REPLACEMENT CHARACTER) ignore ignore invalid UTF-8 sequences; all bytes are copied to the output unchanged"},{"location":"api/basic_json/error_handler_t/#examples","title":"Examples","text":"Example

    The example below shows how the different values of the error_handler_t influence the behavior of dump when reading serializing an invalid UTF-8 sequence.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // create JSON value with invalid UTF-8 byte sequence\n    json j_invalid = \"\u00e4\\xA9\u00fc\";\n    try\n    {\n        std::cout << j_invalid.dump() << std::endl;\n    }\n    catch (const json::type_error& e)\n    {\n        std::cout << e.what() << std::endl;\n    }\n\n    std::cout << \"string with replaced invalid characters: \"\n              << j_invalid.dump(-1, ' ', false, json::error_handler_t::replace)\n              << \"\\nstring with ignored invalid characters: \"\n              << j_invalid.dump(-1, ' ', false, json::error_handler_t::ignore)\n              << '\\n';\n}\n

    Output:

    [json.exception.type_error.316] invalid UTF-8 byte at index 2: 0xA9\nstring with replaced invalid characters: \"\u00e4\ufffd\u00fc\"\nstring with ignored invalid characters: \"\u00e4\u00fc\"\n
    "},{"location":"api/basic_json/error_handler_t/#version-history","title":"Version history","text":"
    • Added in version 3.4.0.
    "},{"location":"api/basic_json/exception/","title":"nlohmann::basic_json::exception","text":"
    class exception : public std::exception;\n

    This class is an extension of std::exception objects with a member id for exception ids. It is used as the base class for all exceptions thrown by the basic_json class. This class can hence be used as \"wildcard\" to catch exceptions, see example below.

    classDiagram\n  direction LR\n\n    class std_exception [\"std::exception\"] {\n        <<interface>>\n    }\n\n    class json_exception [\"basic_json::exception\"] {\n        +const int id\n        +const char* what() const\n    }\n\n    class json_parse_error [\"basic_json::parse_error\"] {\n        +const std::size_t byte\n    }\n\n    class json_invalid_iterator [\"basic_json::invalid_iterator\"]\n    class json_type_error [\"basic_json::type_error\"]\n    class json_out_of_range [\"basic_json::out_of_range\"]\n    class json_other_error [\"basic_json::other_error\"]\n\n    std_exception <|-- json_exception\n    json_exception <|-- json_parse_error\n    json_exception <|-- json_invalid_iterator\n    json_exception <|-- json_type_error\n    json_exception <|-- json_out_of_range\n    json_exception <|-- json_other_error\n\n    style json_exception fill:#CCCCFF

    Subclasses:

    • parse_error for exceptions indicating a parse error
    • invalid_iterator for exceptions indicating errors with iterators
    • type_error for exceptions indicating executing a member function with a wrong type
    • out_of_range for exceptions indicating access out of the defined range
    • other_error for exceptions indicating other library errors
    "},{"location":"api/basic_json/exception/#member-functions","title":"Member functions","text":"
    • what - returns explanatory string
    "},{"location":"api/basic_json/exception/#member-variables","title":"Member variables","text":"
    • id - the id of the exception
    "},{"location":"api/basic_json/exception/#notes","title":"Notes","text":"

    To have nothrow-copy-constructible exceptions, we internally use std::runtime_error which can cope with arbitrary-length error messages. Intermediate strings are built with static functions and then passed to the actual constructor.

    "},{"location":"api/basic_json/exception/#examples","title":"Examples","text":"Example

    The following code shows how arbitrary library exceptions can be caught.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    try\n    {\n        // calling at() for a non-existing key\n        json j = {{\"foo\", \"bar\"}};\n        json k = j.at(\"non-existing\");\n    }\n    catch (const json::exception& e)\n    {\n        // output exception information\n        std::cout << \"message: \" << e.what() << '\\n'\n                  << \"exception id: \" << e.id << std::endl;\n    }\n}\n

    Output:

    message: [json.exception.out_of_range.403] key 'non-existing' not found\nexception id: 403\n
    "},{"location":"api/basic_json/exception/#see-also","title":"See also","text":"

    List of exceptions

    "},{"location":"api/basic_json/exception/#version-history","title":"Version history","text":"
    • Since version 3.0.0.
    "},{"location":"api/basic_json/find/","title":"nlohmann::basic_json::find","text":"
    // (1)\niterator find(const typename object_t::key_type& key);\nconst_iterator find(const typename object_t::key_type& key) const;\n\n// (2)\ntemplate<typename KeyType>\niterator find(KeyType&& key);\ntemplate<typename KeyType>\nconst_iterator find(KeyType&& key) const;\n
    1. Finds an element in a JSON object with a key equivalent to key. If the element is not found or the JSON value is not an object, end() is returned.
    2. See 1. This overload is only available if KeyType is comparable with typename object_t::key_type and typename object_comparator_t::is_transparent denotes a type.
    "},{"location":"api/basic_json/find/#template-parameters","title":"Template parameters","text":"KeyType A type for an object key other than json_pointer that is comparable with string_t using object_comparator_t. This can also be a string view (C++17)."},{"location":"api/basic_json/find/#parameters","title":"Parameters","text":"key (in) key value of the element to search for."},{"location":"api/basic_json/find/#return-value","title":"Return value","text":"

    Iterator to an element with a key equivalent to key. If no such element is found or the JSON value is not an object, a past-the-end iterator (see end()) is returned.

    "},{"location":"api/basic_json/find/#exception-safety","title":"Exception safety","text":"

    Strong exception safety: if an exception occurs, the original value stays intact.

    "},{"location":"api/basic_json/find/#complexity","title":"Complexity","text":"

    Logarithmic in the size of the JSON object.

    "},{"location":"api/basic_json/find/#notes","title":"Notes","text":"

    This method always returns end() when executed on a JSON type that is not an object.

    "},{"location":"api/basic_json/find/#examples","title":"Examples","text":"Example: (1) find object element by key

    The example shows how find() is used.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // create a JSON object\n    json j_object = {{\"one\", 1}, {\"two\", 2}};\n\n    // call find\n    auto it_two = j_object.find(\"two\");\n    auto it_three = j_object.find(\"three\");\n\n    // print values\n    std::cout << std::boolalpha;\n    std::cout << \"\\\"two\\\" was found: \" << (it_two != j_object.end()) << '\\n';\n    std::cout << \"value at key \\\"two\\\": \" << *it_two << '\\n';\n    std::cout << \"\\\"three\\\" was found: \" << (it_three != j_object.end()) << '\\n';\n}\n

    Output:

    \"two\" was found: true\nvalue at key \"two\": 2\n\"three\" was found: false\n
    Example: (2) find object element by key using string_view

    The example shows how find() is used.

    #include <iostream>\n#include <string_view>\n#include <nlohmann/json.hpp>\n\nusing namespace std::string_view_literals;\nusing json = nlohmann::json;\n\nint main()\n{\n    // create a JSON object\n    json j_object = {{\"one\", 1}, {\"two\", 2}};\n\n    // call find\n    auto it_two = j_object.find(\"two\"sv);\n    auto it_three = j_object.find(\"three\"sv);\n\n    // print values\n    std::cout << std::boolalpha;\n    std::cout << \"\\\"two\\\" was found: \" << (it_two != j_object.end()) << '\\n';\n    std::cout << \"value at key \\\"two\\\": \" << *it_two << '\\n';\n    std::cout << \"\\\"three\\\" was found: \" << (it_three != j_object.end()) << '\\n';\n}\n

    Output:

    \"two\" was found: true\nvalue at key \"two\": 2\n\"three\" was found: false\n
    "},{"location":"api/basic_json/find/#see-also","title":"See also","text":"
    • contains checks whether a key exists
    "},{"location":"api/basic_json/find/#version-history","title":"Version history","text":"
    1. Added in version 3.11.0.
    2. Added in version 1.0.0. Changed to support comparable types in version 3.11.0.
    "},{"location":"api/basic_json/flatten/","title":"nlohmann::basic_json::flatten","text":"
    basic_json flatten() const;\n

    The function creates a JSON object whose keys are JSON pointers (see RFC 6901) and whose values are all primitive (see is_primitive() for more information). The original JSON value can be restored using the unflatten() function.

    "},{"location":"api/basic_json/flatten/#return-value","title":"Return value","text":"

    an object that maps JSON pointers to primitive values

    "},{"location":"api/basic_json/flatten/#exception-safety","title":"Exception safety","text":"

    Strong exception safety: if an exception occurs, the original value stays intact.

    "},{"location":"api/basic_json/flatten/#complexity","title":"Complexity","text":"

    Linear in the size of the JSON value.

    "},{"location":"api/basic_json/flatten/#notes","title":"Notes","text":"

    Empty objects and arrays are flattened to null and will not be reconstructed correctly by the unflatten() function.

    "},{"location":"api/basic_json/flatten/#examples","title":"Examples","text":"Example

    The following code shows how a JSON object is flattened to an object whose keys consist of JSON pointers.

    #include <iostream>\n#include <iomanip>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // create JSON value\n    json j =\n    {\n        {\"pi\", 3.141},\n        {\"happy\", true},\n        {\"name\", \"Niels\"},\n        {\"nothing\", nullptr},\n        {\n            \"answer\", {\n                {\"everything\", 42}\n            }\n        },\n        {\"list\", {1, 0, 2}},\n        {\n            \"object\", {\n                {\"currency\", \"USD\"},\n                {\"value\", 42.99}\n            }\n        }\n    };\n\n    // call flatten()\n    std::cout << std::setw(4) << j.flatten() << '\\n';\n}\n

    Output:

    {\n    \"/answer/everything\": 42,\n    \"/happy\": true,\n    \"/list/0\": 1,\n    \"/list/1\": 0,\n    \"/list/2\": 2,\n    \"/name\": \"Niels\",\n    \"/nothing\": null,\n    \"/object/currency\": \"USD\",\n    \"/object/value\": 42.99,\n    \"/pi\": 3.141\n}\n
    "},{"location":"api/basic_json/flatten/#see-also","title":"See also","text":"
    • unflatten the reverse function
    "},{"location":"api/basic_json/flatten/#version-history","title":"Version history","text":"
    • Added in version 2.0.0.
    "},{"location":"api/basic_json/from_bjdata/","title":"nlohmann::basic_json::from_bjdata","text":"
    // (1)\ntemplate<typename InputType>\nstatic basic_json from_bjdata(InputType&& i,\n                              const bool strict = true,\n                              const bool allow_exceptions = true);\n// (2)\ntemplate<typename IteratorType>\nstatic basic_json from_bjdata(IteratorType first, IteratorType last,\n                              const bool strict = true,\n                              const bool allow_exceptions = true);\n

    Deserializes a given input to a JSON value using the BJData (Binary JData) serialization format.

    1. Reads from a compatible input.
    2. Reads from an iterator range.

    The exact mapping and its limitations are described on a dedicated page.

    "},{"location":"api/basic_json/from_bjdata/#template-parameters","title":"Template parameters","text":"InputType

    A compatible input, for instance:

    • an std::istream object
    • a FILE pointer
    • a C-style array of characters
    • a pointer to a null-terminated string of single byte characters
    • an object obj for which begin(obj) and end(obj) produces a valid pair of iterators.
    IteratorType a compatible iterator type"},{"location":"api/basic_json/from_bjdata/#parameters","title":"Parameters","text":"i (in) an input in BJData format convertible to an input adapter first (in) iterator to the start of the input last (in) iterator to the end of the input strict (in) whether to expect the input to be consumed until EOF (true by default) allow_exceptions (in) whether to throw exceptions in case of a parse error (optional, true by default)"},{"location":"api/basic_json/from_bjdata/#return-value","title":"Return value","text":"

    deserialized JSON value; in case of a parse error and allow_exceptions set to false, the return value will be value_t::discarded. The latter can be checked with is_discarded.

    "},{"location":"api/basic_json/from_bjdata/#exception-safety","title":"Exception safety","text":"

    Strong guarantee: if an exception is thrown, there are no changes in the JSON value.

    "},{"location":"api/basic_json/from_bjdata/#exceptions","title":"Exceptions","text":"
    • Throws parse_error.110 if the given input ends prematurely or the end of the file was not reached when strict was set to true
    • Throws parse_error.112 if a parse error occurs
    • Throws parse_error.113 if a string could not be parsed successfully
    "},{"location":"api/basic_json/from_bjdata/#complexity","title":"Complexity","text":"

    Linear in the size of the input.

    "},{"location":"api/basic_json/from_bjdata/#examples","title":"Examples","text":"Example

    The example shows the deserialization of a byte vector in BJData format to a JSON value.

    #include <iostream>\n#include <iomanip>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // create byte vector\n    std::vector<std::uint8_t> v = {0x7B, 0x69, 0x07, 0x63, 0x6F, 0x6D, 0x70, 0x61,\n                                   0x63, 0x74, 0x54, 0x69, 0x06, 0x73, 0x63, 0x68,\n                                   0x65, 0x6D, 0x61, 0x69, 0x00, 0x7D\n                                  };\n\n    // deserialize it with BJData\n    json j = json::from_bjdata(v);\n\n    // print the deserialized JSON value\n    std::cout << std::setw(2) << j << std::endl;\n}\n

    Output:

    {\n  \"compact\": true,\n  \"schema\": 0\n}\n
    "},{"location":"api/basic_json/from_bjdata/#version-history","title":"Version history","text":"
    • Added in version 3.11.0.
    "},{"location":"api/basic_json/from_bson/","title":"nlohmann::basic_json::from_bson","text":"
    // (1)\ntemplate<typename InputType>\nstatic basic_json from_bson(InputType&& i,\n                            const bool strict = true,\n                            const bool allow_exceptions = true);\n// (2)\ntemplate<typename IteratorType>\nstatic basic_json from_bson(IteratorType first, IteratorType last,\n                            const bool strict = true,\n                            const bool allow_exceptions = true);\n

    Deserializes a given input to a JSON value using the BSON (Binary JSON) serialization format.

    1. Reads from a compatible input.
    2. Reads from an iterator range.

    The exact mapping and its limitations are described on a dedicated page.

    "},{"location":"api/basic_json/from_bson/#template-parameters","title":"Template parameters","text":"InputType

    A compatible input, for instance:

    • an std::istream object
    • a FILE pointer
    • a C-style array of characters
    • a pointer to a null-terminated string of single byte characters
    • an object obj for which begin(obj) and end(obj) produces a valid pair of iterators.
    IteratorType a compatible iterator type"},{"location":"api/basic_json/from_bson/#parameters","title":"Parameters","text":"i (in) an input in BSON format convertible to an input adapter first (in) iterator to the start of the input last (in) iterator to the end of the input strict (in) whether to expect the input to be consumed until EOF (true by default) allow_exceptions (in) whether to throw exceptions in case of a parse error (optional, true by default)"},{"location":"api/basic_json/from_bson/#return-value","title":"Return value","text":"

    deserialized JSON value; in case of a parse error and allow_exceptions set to false, the return value will be value_t::discarded. The latter can be checked with is_discarded.

    "},{"location":"api/basic_json/from_bson/#exception-safety","title":"Exception safety","text":"

    Strong guarantee: if an exception is thrown, there are no changes in the JSON value.

    "},{"location":"api/basic_json/from_bson/#exceptions","title":"Exceptions","text":"

    Throws parse_error.114 if an unsupported BSON record type is encountered.

    "},{"location":"api/basic_json/from_bson/#complexity","title":"Complexity","text":"

    Linear in the size of the input.

    "},{"location":"api/basic_json/from_bson/#examples","title":"Examples","text":"Example

    The example shows the deserialization of a byte vector in BSON format to a JSON value.

    #include <iostream>\n#include <iomanip>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // create byte vector\n    std::vector<std::uint8_t> v = {0x1b, 0x00, 0x00, 0x00, 0x08, 0x63, 0x6f, 0x6d,\n                                   0x70, 0x61, 0x63, 0x74, 0x00, 0x01, 0x10, 0x73,\n                                   0x63, 0x68, 0x65, 0x6d, 0x61, 0x00, 0x00, 0x00,\n                                   0x00, 0x00, 0x00\n                                  };\n\n    // deserialize it with BSON\n    json j = json::from_bson(v);\n\n    // print the deserialized JSON value\n    std::cout << std::setw(2) << j << std::endl;\n}\n

    Output:

    {\n  \"compact\": true,\n  \"schema\": 0\n}\n
    "},{"location":"api/basic_json/from_bson/#see-also","title":"See also","text":"
    • BSON specification
    • to_bson for the analogous serialization
    • from_cbor for the related CBOR format
    • from_msgpack for the related MessagePack format
    • from_ubjson for the related UBJSON format
    "},{"location":"api/basic_json/from_bson/#version-history","title":"Version history","text":"
    • Added in version 3.4.0.

    Deprecation

    • Overload (2) replaces calls to from_bson with a pointer and a length as first two parameters, which has been deprecated in version 3.8.0. This overload will be removed in version 4.0.0. Please replace all calls like from_bson(ptr, len, ...); with from_bson(ptr, ptr+len, ...);.
    • Overload (2) replaces calls to from_bson with a pair of iterators as their first parameter, which has been deprecated in version 3.8.0. This overload will be removed in version 4.0.0. Please replace all calls like from_bson({ptr, ptr+len}, ...); with from_bson(ptr, ptr+len, ...);.

    You should be warned by your compiler with a -Wdeprecated-declarations warning if you are using a deprecated function.

    "},{"location":"api/basic_json/from_cbor/","title":"nlohmann::basic_json::from_cbor","text":"
    // (1)\ntemplate<typename InputType>\nstatic basic_json from_cbor(InputType&& i,\n                            const bool strict = true,\n                            const bool allow_exceptions = true,\n                            const cbor_tag_handler_t tag_handler = cbor_tag_handler_t::error);\n\n// (2)\ntemplate<typename IteratorType>\nstatic basic_json from_cbor(IteratorType first, IteratorType last,\n                            const bool strict = true,\n                            const bool allow_exceptions = true,\n                            const cbor_tag_handler_t tag_handler = cbor_tag_handler_t::error);\n

    Deserializes a given input to a JSON value using the CBOR (Concise Binary Object Representation) serialization format.

    1. Reads from a compatible input.
    2. Reads from an iterator range.

    The exact mapping and its limitations are described on a dedicated page.

    "},{"location":"api/basic_json/from_cbor/#template-parameters","title":"Template parameters","text":"InputType

    A compatible input, for instance:

    • an std::istream object
    • a FILE pointer
    • a C-style array of characters
    • a pointer to a null-terminated string of single byte characters
    • an object obj for which begin(obj) and end(obj) produces a valid pair of iterators.
    IteratorType a compatible iterator type"},{"location":"api/basic_json/from_cbor/#parameters","title":"Parameters","text":"i (in) an input in CBOR format convertible to an input adapter first (in) iterator to the start of the input last (in) iterator to the end of the input strict (in) whether to expect the input to be consumed until EOF (true by default) allow_exceptions (in) whether to throw exceptions in case of a parse error (optional, true by default) tag_handler (in) how to treat CBOR tags (optional, error by default); see cbor_tag_handler_t for more information"},{"location":"api/basic_json/from_cbor/#return-value","title":"Return value","text":"

    deserialized JSON value; in case of a parse error and allow_exceptions set to false, the return value will be value_t::discarded. The latter can be checked with is_discarded.

    "},{"location":"api/basic_json/from_cbor/#exception-safety","title":"Exception safety","text":"

    Strong guarantee: if an exception is thrown, there are no changes in the JSON value.

    "},{"location":"api/basic_json/from_cbor/#exceptions","title":"Exceptions","text":"
    • Throws parse_error.110 if the given input ends prematurely or the end of the file was not reached when strict was set to true
    • Throws parse_error.112 if unsupported features from CBOR were used in the given input or if the input is not valid CBOR
    • Throws parse_error.113 if a string was expected as a map key, but not found
    "},{"location":"api/basic_json/from_cbor/#complexity","title":"Complexity","text":"

    Linear in the size of the input.

    "},{"location":"api/basic_json/from_cbor/#examples","title":"Examples","text":"Example

    The example shows the deserialization of a byte vector in CBOR format to a JSON value.

    #include <iostream>\n#include <iomanip>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // create byte vector\n    std::vector<std::uint8_t> v = {0xa2, 0x67, 0x63, 0x6f, 0x6d, 0x70, 0x61, 0x63,\n                                   0x74, 0xf5, 0x66, 0x73, 0x63, 0x68, 0x65, 0x6d,\n                                   0x61, 0x00\n                                  };\n\n    // deserialize it with CBOR\n    json j = json::from_cbor(v);\n\n    // print the deserialized JSON value\n    std::cout << std::setw(2) << j << std::endl;\n}\n

    Output:

    {\n  \"compact\": true,\n  \"schema\": 0\n}\n
    "},{"location":"api/basic_json/from_cbor/#version-history","title":"Version history","text":"
    • Added in version 2.0.9.
    • Parameter start_index since version 2.1.1.
    • Changed to consume input adapters, removed start_index parameter, and added strict parameter in version 3.0.0.
    • Added allow_exceptions parameter in version 3.2.0.
    • Added tag_handler parameter in version 3.9.0.

    Deprecation

    • Overload (2) replaces calls to from_cbor with a pointer and a length as first two parameters, which has been deprecated in version 3.8.0. This overload will be removed in version 4.0.0. Please replace all calls like from_cbor(ptr, len, ...); with from_cbor(ptr, ptr+len, ...);.
    • Overload (2) replaces calls to from_cbor with a pair of iterators as their first parameter, which has been deprecated in version 3.8.0. This overload will be removed in version 4.0.0. Please replace all calls like from_cbor({ptr, ptr+len}, ...); with from_cbor(ptr, ptr+len, ...);.

    You should be warned by your compiler with a -Wdeprecated-declarations warning if you are using a deprecated function.

    "},{"location":"api/basic_json/from_msgpack/","title":"nlohmann::basic_json::from_msgpack","text":"
    // (1)\ntemplate<typename InputType>\nstatic basic_json from_msgpack(InputType&& i,\n                               const bool strict = true,\n                               const bool allow_exceptions = true);\n// (2)\ntemplate<typename IteratorType>\nstatic basic_json from_msgpack(IteratorType first, IteratorType last,\n                               const bool strict = true,\n                               const bool allow_exceptions = true);\n

    Deserializes a given input to a JSON value using the MessagePack serialization format.

    1. Reads from a compatible input.
    2. Reads from an iterator range.

    The exact mapping and its limitations are described on a dedicated page.

    "},{"location":"api/basic_json/from_msgpack/#template-parameters","title":"Template parameters","text":"InputType

    A compatible input, for instance:

    • an std::istream object
    • a FILE pointer
    • a C-style array of characters
    • a pointer to a null-terminated string of single byte characters
    • an object obj for which begin(obj) and end(obj) produces a valid pair of iterators.
    IteratorType a compatible iterator type"},{"location":"api/basic_json/from_msgpack/#parameters","title":"Parameters","text":"i (in) an input in MessagePack format convertible to an input adapter first (in) iterator to the start of the input last (in) iterator to the end of the input strict (in) whether to expect the input to be consumed until EOF (true by default) allow_exceptions (in) whether to throw exceptions in case of a parse error (optional, true by default)"},{"location":"api/basic_json/from_msgpack/#return-value","title":"Return value","text":"

    deserialized JSON value; in case of a parse error and allow_exceptions set to false, the return value will be value_t::discarded. The latter can be checked with is_discarded.

    "},{"location":"api/basic_json/from_msgpack/#exception-safety","title":"Exception safety","text":"

    Strong guarantee: if an exception is thrown, there are no changes in the JSON value.

    "},{"location":"api/basic_json/from_msgpack/#exceptions","title":"Exceptions","text":"
    • Throws parse_error.110 if the given input ends prematurely or the end of the file was not reached when strict was set to true
    • Throws parse_error.112 if unsupported features from MessagePack were used in the given input or if the input is not valid MessagePack
    • Throws parse_error.113 if a string was expected as a map key, but not found
    "},{"location":"api/basic_json/from_msgpack/#complexity","title":"Complexity","text":"

    Linear in the size of the input.

    "},{"location":"api/basic_json/from_msgpack/#examples","title":"Examples","text":"Example

    The example shows the deserialization of a byte vector in MessagePack format to a JSON value.

    #include <iostream>\n#include <iomanip>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // create byte vector\n    std::vector<std::uint8_t> v = {0x82, 0xa7, 0x63, 0x6f, 0x6d, 0x70, 0x61, 0x63,\n                                   0x74, 0xc3, 0xa6, 0x73, 0x63, 0x68, 0x65, 0x6d,\n                                   0x61, 0x00\n                                  };\n\n    // deserialize it with MessagePack\n    json j = json::from_msgpack(v);\n\n    // print the deserialized JSON value\n    std::cout << std::setw(2) << j << std::endl;\n}\n

    Output:

    {\n  \"compact\": true,\n  \"schema\": 0\n}\n
    "},{"location":"api/basic_json/from_msgpack/#version-history","title":"Version history","text":"
    • Added in version 2.0.9.
    • Parameter start_index since version 2.1.1.
    • Changed to consume input adapters, removed start_index parameter, and added strict parameter in version 3.0.0.
    • Added allow_exceptions parameter in version 3.2.0.

    Deprecation

    • Overload (2) replaces calls to from_msgpack with a pointer and a length as first two parameters, which has been deprecated in version 3.8.0. This overload will be removed in version 4.0.0. Please replace all calls like from_msgpack(ptr, len, ...); with from_msgpack(ptr, ptr+len, ...);.
    • Overload (2) replaces calls to from_cbor with a pair of iterators as their first parameter, which has been deprecated in version 3.8.0. This overload will be removed in version 4.0.0. Please replace all calls like from_msgpack({ptr, ptr+len}, ...); with from_msgpack(ptr, ptr+len, ...);.

    You should be warned by your compiler with a -Wdeprecated-declarations warning if you are using a deprecated function.

    "},{"location":"api/basic_json/from_ubjson/","title":"nlohmann::basic_json::from_ubjson","text":"
    // (1)\ntemplate<typename InputType>\nstatic basic_json from_ubjson(InputType&& i,\n                              const bool strict = true,\n                              const bool allow_exceptions = true);\n// (2)\ntemplate<typename IteratorType>\nstatic basic_json from_ubjson(IteratorType first, IteratorType last,\n                              const bool strict = true,\n                              const bool allow_exceptions = true);\n

    Deserializes a given input to a JSON value using the UBJSON (Universal Binary JSON) serialization format.

    1. Reads from a compatible input.
    2. Reads from an iterator range.

    The exact mapping and its limitations are described on a dedicated page.

    "},{"location":"api/basic_json/from_ubjson/#template-parameters","title":"Template parameters","text":"InputType

    A compatible input, for instance:

    • an std::istream object
    • a FILE pointer
    • a C-style array of characters
    • a pointer to a null-terminated string of single byte characters
    • an object obj for which begin(obj) and end(obj) produces a valid pair of iterators.
    IteratorType a compatible iterator type"},{"location":"api/basic_json/from_ubjson/#parameters","title":"Parameters","text":"i (in) an input in UBJSON format convertible to an input adapter first (in) iterator to the start of the input last (in) iterator to the end of the input strict (in) whether to expect the input to be consumed until EOF (true by default) allow_exceptions (in) whether to throw exceptions in case of a parse error (optional, true by default)"},{"location":"api/basic_json/from_ubjson/#return-value","title":"Return value","text":"

    deserialized JSON value; in case of a parse error and allow_exceptions set to false, the return value will be value_t::discarded. The latter can be checked with is_discarded.

    "},{"location":"api/basic_json/from_ubjson/#exception-safety","title":"Exception safety","text":"

    Strong guarantee: if an exception is thrown, there are no changes in the JSON value.

    "},{"location":"api/basic_json/from_ubjson/#exceptions","title":"Exceptions","text":"
    • Throws parse_error.110 if the given input ends prematurely or the end of the file was not reached when strict was set to true
    • Throws parse_error.112 if a parse error occurs
    • Throws parse_error.113 if a string could not be parsed successfully
    "},{"location":"api/basic_json/from_ubjson/#complexity","title":"Complexity","text":"

    Linear in the size of the input.

    "},{"location":"api/basic_json/from_ubjson/#examples","title":"Examples","text":"Example

    The example shows the deserialization of a byte vector in UBJSON format to a JSON value.

    #include <iostream>\n#include <iomanip>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // create byte vector\n    std::vector<std::uint8_t> v = {0x7B, 0x69, 0x07, 0x63, 0x6F, 0x6D, 0x70, 0x61,\n                                   0x63, 0x74, 0x54, 0x69, 0x06, 0x73, 0x63, 0x68,\n                                   0x65, 0x6D, 0x61, 0x69, 0x00, 0x7D\n                                  };\n\n    // deserialize it with UBJSON\n    json j = json::from_ubjson(v);\n\n    // print the deserialized JSON value\n    std::cout << std::setw(2) << j << std::endl;\n}\n

    Output:

    {\n  \"compact\": true,\n  \"schema\": 0\n}\n
    "},{"location":"api/basic_json/from_ubjson/#version-history","title":"Version history","text":"
    • Added in version 3.1.0.
    • Added allow_exceptions parameter in version 3.2.0.

    Deprecation

    • Overload (2) replaces calls to from_ubjson with a pointer and a length as first two parameters, which has been deprecated in version 3.8.0. This overload will be removed in version 4.0.0. Please replace all calls like from_ubjson(ptr, len, ...); with from_ubjson(ptr, ptr+len, ...);.
    • Overload (2) replaces calls to from_ubjson with a pair of iterators as their first parameter, which has been deprecated in version 3.8.0. This overload will be removed in version 4.0.0. Please replace all calls like from_ubjson({ptr, ptr+len}, ...); with from_ubjson(ptr, ptr+len, ...);.

    You should be warned by your compiler with a -Wdeprecated-declarations warning if you are using a deprecated function.

    "},{"location":"api/basic_json/front/","title":"nlohmann::basic_json::front","text":"
    reference front();\nconst_reference front() const;\n

    Returns a reference to the first element in the container. For a JSON container c, the expression c.front() is equivalent to *c.begin().

    "},{"location":"api/basic_json/front/#return-value","title":"Return value","text":"

    In the case of a structured type (array or object), a reference to the first element is returned. In the case of number, string, boolean, or binary values, a reference to the value is returned.

    "},{"location":"api/basic_json/front/#exception-safety","title":"Exception safety","text":"

    Strong guarantee: if an exception is thrown, there are no changes in the JSON value.

    "},{"location":"api/basic_json/front/#exceptions","title":"Exceptions","text":"

    If the JSON value is null, exception invalid_iterator.214 is thrown.

    "},{"location":"api/basic_json/front/#complexity","title":"Complexity","text":"

    Constant.

    "},{"location":"api/basic_json/front/#notes","title":"Notes","text":"

    Precondition

    The array or object must not be empty. Calling front on an empty array or object yields undefined behavior.

    "},{"location":"api/basic_json/front/#examples","title":"Examples","text":"Example

    The following code shows an example for front().

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // create JSON values\n    json j_null;\n    json j_boolean = true;\n    json j_number_integer = 17;\n    json j_number_float = 23.42;\n    json j_object = {{\"one\", 1}, {\"two\", 2}};\n    json j_object_empty(json::value_t::object);\n    json j_array = {1, 2, 4, 8, 16};\n    json j_array_empty(json::value_t::array);\n    json j_string = \"Hello, world\";\n\n    // call front()\n    //std::cout << j_null.front() << '\\n';          // would throw\n    std::cout << j_boolean.front() << '\\n';\n    std::cout << j_number_integer.front() << '\\n';\n    std::cout << j_number_float.front() << '\\n';\n    std::cout << j_object.front() << '\\n';\n    //std::cout << j_object_empty.front() << '\\n';  // undefined behavior\n    std::cout << j_array.front() << '\\n';\n    //std::cout << j_array_empty.front() << '\\n';   // undefined behavior\n    std::cout << j_string.front() << '\\n';\n}\n

    Output:

    true\n17\n23.42\n1\n1\n\"Hello, world\"\n
    "},{"location":"api/basic_json/front/#see-also","title":"See also","text":"
    • back to access the last element
    "},{"location":"api/basic_json/front/#version-history","title":"Version history","text":"
    • Added in version 1.0.0.
    • Adjusted code to return reference to binary values in version 3.8.0.
    "},{"location":"api/basic_json/get/","title":"nlohmann::basic_json::get","text":"
    // (1)\ntemplate<typename ValueType>\nValueType get() const noexcept(\n    noexcept(JSONSerializer<ValueType>::from_json(\n        std::declval<const basic_json_t&>(), std::declval<ValueType&>())));\n\n// (2)\ntemplate<typename BasicJsonType>\nBasicJsonType get() const;\n\n// (3)\ntemplate<typename PointerType>\nPointerType get_ptr();\n\ntemplate<typename PointerType>\nconstexpr const PointerType get_ptr() const noexcept;\n

    1. Explicit type conversion between the JSON value and a compatible value which is CopyConstructible and DefaultConstructible. The value is converted by calling the json_serializer<ValueType> from_json() method.

      The function is equivalent to executing 

      ValueType ret;\nJSONSerializer<ValueType>::from_json(*this, ret);\nreturn ret;\n

      This overload is chosen if:

      • ValueType is not basic_json,
      • json_serializer<ValueType> has a from_json() method of the form void from_json(const basic_json&, ValueType&), and
      • json_serializer<ValueType> does not have a from_json() method of the form ValueType from_json(const basic_json&)

      If the type is not CopyConstructible and not DefaultConstructible, the value is converted by calling the json_serializer<ValueType> from_json() method.

      The function is then equivalent to executing 

      return JSONSerializer<ValueTypeCV>::from_json(*this);\n

      This overload is chosen if:

      • ValueType is not basic_json and
      • json_serializer<ValueType> has a from_json() method of the form ValueType from_json(const basic_json&)

      If json_serializer<ValueType> has both overloads of from_json(), the latter one is chosen.

    2. Overload for basic_json specializations. The function is equivalent to executing 

      return *this;\n

    3. Explicit pointer access to the internally stored JSON value. No copies are made.

    "},{"location":"api/basic_json/get/#template-parameters","title":"Template parameters","text":"ValueType the value type to return BasicJsonType a specialization of basic_json PointerType pointer type; must be a pointer to array_t, object_t, string_t, boolean_t, number_integer_t, or number_unsigned_t, number_float_t, or binary_t. Other types will not compile."},{"location":"api/basic_json/get/#return-value","title":"Return value","text":"
    1. copy of the JSON value, converted to ValueType
    2. a copy of *this, converted into BasicJsonType
    3. pointer to the internally stored JSON value if the requested pointer type fits to the JSON value; nullptr otherwise
    "},{"location":"api/basic_json/get/#exceptions","title":"Exceptions","text":"

    Depends on what json_serializer<ValueType> from_json() method throws

    "},{"location":"api/basic_json/get/#notes","title":"Notes","text":"

    Undefined behavior

    Writing data to the pointee (overload 3) of the result yields an undefined state.

    "},{"location":"api/basic_json/get/#examples","title":"Examples","text":"Example

    The example below shows several conversions from JSON values to other types. There a few things to note: (1) Floating-point numbers can be converted to integers, (2) A JSON array can be converted to a standard std::vector<short>, (3) A JSON object can be converted to C++ associative containers such as std::unordered_map<std::string, json>.

    #include <iostream>\n#include <unordered_map>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // create a JSON value with different types\n    json json_types =\n    {\n        {\"boolean\", true},\n        {\n            \"number\", {\n                {\"integer\", 42},\n                {\"floating-point\", 17.23}\n            }\n        },\n        {\"string\", \"Hello, world!\"},\n        {\"array\", {1, 2, 3, 4, 5}},\n        {\"null\", nullptr}\n    };\n\n    // use explicit conversions\n    auto v1 = json_types[\"boolean\"].template get<bool>();\n    auto v2 = json_types[\"number\"][\"integer\"].template get<int>();\n    auto v3 = json_types[\"number\"][\"integer\"].template get<short>();\n    auto v4 = json_types[\"number\"][\"floating-point\"].template get<float>();\n    auto v5 = json_types[\"number\"][\"floating-point\"].template get<int>();\n    auto v6 = json_types[\"string\"].template get<std::string>();\n    auto v7 = json_types[\"array\"].template get<std::vector<short>>();\n    auto v8 = json_types.template get<std::unordered_map<std::string, json>>();\n\n    // print the conversion results\n    std::cout << v1 << '\\n';\n    std::cout << v2 << ' ' << v3 << '\\n';\n    std::cout << v4 << ' ' << v5 << '\\n';\n    std::cout << v6 << '\\n';\n\n    for (auto i : v7)\n    {\n        std::cout << i << ' ';\n    }\n    std::cout << \"\\n\\n\";\n\n    for (auto i : v8)\n    {\n        std::cout << i.first << \": \" << i.second << '\\n';\n    }\n}\n

    Output:

    1\n42 42\n17.23 17\nHello, world!\n1 2 3 4 5 \n\nstring: \"Hello, world!\"\nnumber: {\"floating-point\":17.23,\"integer\":42}\nnull: null\nboolean: true\narray: [1,2,3,4,5]\n
    Example

    The example below shows how pointers to internal values of a JSON value can be requested. Note that no type conversions are made and a #cpp nullptr is returned if the value and the requested pointer type does not match.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // create a JSON number\n    json value = 17;\n\n    // explicitly getting pointers\n    auto p1 = value.template get<const json::number_integer_t*>();\n    auto p2 = value.template get<json::number_integer_t*>();\n    auto p3 = value.template get<json::number_integer_t* const>();\n    auto p4 = value.template get<const json::number_integer_t* const>();\n    auto p5 = value.template get<json::number_float_t*>();\n\n    // print the pointees\n    std::cout << *p1 << ' ' << *p2 << ' ' << *p3 << ' ' << *p4 << '\\n';\n    std::cout << std::boolalpha << (p5 == nullptr) << '\\n';\n}\n

    Output:

    17 17 17 17\ntrue\n
    "},{"location":"api/basic_json/get/#version-history","title":"Version history","text":"
    1. Since version 2.1.0.
    2. Since version 2.1.0. Extended to work with other specializations of basic_json in version 3.2.0.
    3. Since version 1.0.0.
    "},{"location":"api/basic_json/get_allocator/","title":"nlohmann::basic_json::get_allocator","text":"
    static allocator_type get_allocator();\n

    Returns the allocator associated with the container.

    "},{"location":"api/basic_json/get_allocator/#return-value","title":"Return value","text":"

    associated allocator

    "},{"location":"api/basic_json/get_allocator/#examples","title":"Examples","text":"Example

    The example shows how get_allocator() is used to created json values.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    auto alloc = json::get_allocator();\n    using traits_t = std::allocator_traits<decltype(alloc)>;\n\n    json* j = traits_t::allocate(alloc, 1);\n    traits_t::construct(alloc, j, \"Hello, world!\");\n\n    std::cout << *j << std::endl;\n\n    traits_t::destroy(alloc, j);\n    traits_t::deallocate(alloc, j, 1);\n}\n

    Output:

    \"Hello, world!\"\n
    "},{"location":"api/basic_json/get_allocator/#version-history","title":"Version history","text":"
    • Added in version 1.0.0.
    "},{"location":"api/basic_json/get_binary/","title":"nlohmann::basic_json::get_binary","text":"
    binary_t& get_binary();\n\nconst binary_t& get_binary() const;\n

    Returns a reference to the stored binary value.

    "},{"location":"api/basic_json/get_binary/#return-value","title":"Return value","text":"

    Reference to binary value.

    "},{"location":"api/basic_json/get_binary/#exception-safety","title":"Exception safety","text":"

    Strong exception safety: if an exception occurs, the original value stays intact.

    "},{"location":"api/basic_json/get_binary/#exceptions","title":"Exceptions","text":"

    Throws type_error.302 if the value is not binary

    "},{"location":"api/basic_json/get_binary/#complexity","title":"Complexity","text":"

    Constant.

    "},{"location":"api/basic_json/get_binary/#examples","title":"Examples","text":"Example

    The following code shows how to query a binary value.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // create a binary vector\n    std::vector<std::uint8_t> vec = {0xCA, 0xFE, 0xBA, 0xBE};\n\n    // create a binary JSON value with subtype 42\n    json j = json::binary(vec, 42);\n\n    // output type and subtype\n    std::cout << \"type: \" << j.type_name() << \", subtype: \" << j.get_binary().subtype() << std::endl;\n}\n

    Output:

    type: binary, subtype: 42\n
    "},{"location":"api/basic_json/get_binary/#version-history","title":"Version history","text":"
    • Added in version 3.8.0.
    "},{"location":"api/basic_json/get_ptr/","title":"nlohmann::basic_json::get_ptr","text":"
    template<typename PointerType>\nPointerType get_ptr() noexcept;\n\ntemplate<typename PointerType>\nconstexpr const PointerType get_ptr() const noexcept;\n

    Implicit pointer access to the internally stored JSON value. No copies are made.

    "},{"location":"api/basic_json/get_ptr/#template-parameters","title":"Template parameters","text":"PointerType pointer type; must be a pointer to array_t, object_t, string_t, boolean_t, number_integer_t, or number_unsigned_t, number_float_t, or binary_t. Other types will not compile."},{"location":"api/basic_json/get_ptr/#return-value","title":"Return value","text":"

    pointer to the internally stored JSON value if the requested pointer type fits to the JSON value; nullptr otherwise

    "},{"location":"api/basic_json/get_ptr/#exception-safety","title":"Exception safety","text":"

    No-throw guarantee: this function never throws exceptions.

    "},{"location":"api/basic_json/get_ptr/#complexity","title":"Complexity","text":"

    Constant.

    "},{"location":"api/basic_json/get_ptr/#notes","title":"Notes","text":"

    Undefined behavior

    The pointer becomes invalid if the underlying JSON object changes.

    Consider the following example code where the pointer ptr changes after the array is resized. As a result, reading or writing to ptr after the array change would be undefined behavior. The address of the first array element changes, because the underlying std::vector is resized after adding a fifth element.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    json j = {1, 2, 3, 4};\n    auto* ptr = j[0].get_ptr<std::int64_t*>();\n    std::cout << \"value at \" << ptr << \" is \" << *ptr << std::endl;\n\n    j.push_back(5);\n\n    ptr = j[0].get_ptr<std::int64_t*>();\n    std::cout << \"value at \" << ptr << \" is \" << *ptr << std::endl;\n}\n

    Output:

    value at 0x6000012fc1c8 is 1\nvalue at 0x6000029fc088 is 1\n
    "},{"location":"api/basic_json/get_ptr/#examples","title":"Examples","text":"Example

    The example below shows how pointers to internal values of a JSON value can be requested. Note that no type conversions are made and a nullptr is returned if the value and the requested pointer type does not match.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // create a JSON number\n    json value = 17;\n\n    // explicitly getting pointers\n    auto p1 = value.get_ptr<const json::number_integer_t*>();\n    auto p2 = value.get_ptr<json::number_integer_t*>();\n    auto p3 = value.get_ptr<json::number_integer_t* const>();\n    auto p4 = value.get_ptr<const json::number_integer_t* const>();\n    auto p5 = value.get_ptr<json::number_float_t*>();\n\n    // print the pointees\n    std::cout << *p1 << ' ' << *p2 << ' ' << *p3 << ' ' << *p4 << '\\n';\n    std::cout << std::boolalpha << (p5 == nullptr) << '\\n';\n}\n

    Output:

    17 17 17 17\ntrue\n
    "},{"location":"api/basic_json/get_ptr/#see-also","title":"See also","text":"
    • get_ref() get a reference value
    "},{"location":"api/basic_json/get_ptr/#version-history","title":"Version history","text":"
    • Added in version 1.0.0.
    • Extended to binary types in version 3.8.0.
    "},{"location":"api/basic_json/get_ref/","title":"nlohmann::basic_json::get_ref","text":"
    template<typename ReferenceType>\nReferenceType get_ref();\n\ntemplate<typename ReferenceType>\nconst ReferenceType get_ref() const;\n

    Implicit reference access to the internally stored JSON value. No copies are made.

    "},{"location":"api/basic_json/get_ref/#template-parameters","title":"Template parameters","text":"ReferenceType reference type; must be a reference to array_t, object_t, string_t, boolean_t, number_integer_t, or number_unsigned_t, number_float_t, or binary_t. Enforced by a static assertion."},{"location":"api/basic_json/get_ref/#return-value","title":"Return value","text":"

    reference to the internally stored JSON value if the requested reference type fits to the JSON value; throws type_error.303 otherwise

    "},{"location":"api/basic_json/get_ref/#exception-safety","title":"Exception safety","text":"

    Strong exception safety: if an exception occurs, the original value stays intact.

    "},{"location":"api/basic_json/get_ref/#exceptions","title":"Exceptions","text":"

    Throws type_error.303 if the requested reference type does not match the stored JSON value type; example: \"incompatible ReferenceType for get_ref, actual type is binary\".

    "},{"location":"api/basic_json/get_ref/#complexity","title":"Complexity","text":"

    Constant.

    "},{"location":"api/basic_json/get_ref/#notes","title":"Notes","text":"

    Undefined behavior

    The reference becomes invalid if the underlying JSON object changes.

    "},{"location":"api/basic_json/get_ref/#examples","title":"Examples","text":"Example

    The example shows several calls to get_ref().

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // create a JSON number\n    json value = 17;\n\n    // explicitly getting references\n    auto r1 = value.get_ref<const json::number_integer_t&>();\n    auto r2 = value.get_ref<json::number_integer_t&>();\n\n    // print the values\n    std::cout << r1 << ' ' << r2 << '\\n';\n\n    // incompatible type throws exception\n    try\n    {\n        auto r3 = value.get_ref<json::number_float_t&>();\n    }\n    catch (const json::type_error& ex)\n    {\n        std::cout << ex.what() << '\\n';\n    }\n}\n

    Output:

    17 17\n[json.exception.type_error.303] incompatible ReferenceType for get_ref, actual type is number\n
    "},{"location":"api/basic_json/get_ref/#see-also","title":"See also","text":"
    • get_ptr() get a pointer value
    "},{"location":"api/basic_json/get_ref/#version-history","title":"Version history","text":"
    • Added in version 1.1.0.
    • Extended to binary types in version 3.8.0.
    "},{"location":"api/basic_json/get_to/","title":"nlohmann::basic_json::get_to","text":"
    template<typename ValueType>\nValueType& get_to(ValueType& v) const noexcept(\n    noexcept(JSONSerializer<ValueType>::from_json(\n        std::declval<const basic_json_t&>(), v)));\n

    Explicit type conversion between the JSON value and a compatible value. The value is filled into the input parameter by calling the json_serializer<ValueType> from_json() method.

    The function is equivalent to executing 

    ValueType v;\nJSONSerializer<ValueType>::from_json(*this, v);\n

    This overload is chosen if:

    • ValueType is not basic_json,
    • json_serializer<ValueType> has a from_json() method of the form void from_json(const basic_json&, ValueType&)
    "},{"location":"api/basic_json/get_to/#template-parameters","title":"Template parameters","text":"ValueType the value type to return"},{"location":"api/basic_json/get_to/#return-value","title":"Return value","text":"

    the input parameter, allowing chaining calls

    "},{"location":"api/basic_json/get_to/#exceptions","title":"Exceptions","text":"

    Depends on what json_serializer<ValueType> from_json() method throws

    "},{"location":"api/basic_json/get_to/#examples","title":"Examples","text":"Example

    The example below shows several conversions from JSON values to other types. There a few things to note: (1) Floating-point numbers can be converted to integers, (2) A JSON array can be converted to a standard std::vector<short>, (3) A JSON object can be converted to C++ associative containers such as #cpp std::unordered_map<std::string, json>.

    #include <iostream>\n#include <unordered_map>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // create a JSON value with different types\n    json json_types =\n    {\n        {\"boolean\", true},\n        {\n            \"number\", {\n                {\"integer\", 42},\n                {\"floating-point\", 17.23}\n            }\n        },\n        {\"string\", \"Hello, world!\"},\n        {\"array\", {1, 2, 3, 4, 5}},\n        {\"null\", nullptr}\n    };\n\n    bool v1;\n    int v2;\n    short v3;\n    float v4;\n    int v5;\n    std::string v6;\n    std::vector<short> v7;\n    std::unordered_map<std::string, json> v8;\n\n    // use explicit conversions\n    json_types[\"boolean\"].get_to(v1);\n    json_types[\"number\"][\"integer\"].get_to(v2);\n    json_types[\"number\"][\"integer\"].get_to(v3);\n    json_types[\"number\"][\"floating-point\"].get_to(v4);\n    json_types[\"number\"][\"floating-point\"].get_to(v5);\n    json_types[\"string\"].get_to(v6);\n    json_types[\"array\"].get_to(v7);\n    json_types.get_to(v8);\n\n    // print the conversion results\n    std::cout << v1 << '\\n';\n    std::cout << v2 << ' ' << v3 << '\\n';\n    std::cout << v4 << ' ' << v5 << '\\n';\n    std::cout << v6 << '\\n';\n\n    for (auto i : v7)\n    {\n        std::cout << i << ' ';\n    }\n    std::cout << \"\\n\\n\";\n\n    for (auto i : v8)\n    {\n        std::cout << i.first << \": \" << i.second << '\\n';\n    }\n}\n

    Output:

    1\n42 42\n17.23 17\nHello, world!\n1 2 3 4 5 \n\nstring: \"Hello, world!\"\nnumber: {\"floating-point\":17.23,\"integer\":42}\nnull: null\nboolean: true\narray: [1,2,3,4,5]\n
    "},{"location":"api/basic_json/get_to/#version-history","title":"Version history","text":"
    • Since version 3.3.0.
    "},{"location":"api/basic_json/input_format_t/","title":"nlohmann::basic_json::input_format_t","text":"
    enum class input_format_t {\n    json,\n    cbor,\n    msgpack,\n    ubjson,\n    bson,\n    bjdata\n};\n

    This enumeration is used in the sax_parse function to choose the input format to parse:

    json JSON (JavaScript Object Notation) cbor CBOR (Concise Binary Object Representation) msgpack MessagePack ubjson UBJSON (Universal Binary JSON) bson BSON (Binary JSON) bjdata BJData (Binary JData)"},{"location":"api/basic_json/input_format_t/#examples","title":"Examples","text":"Example

    The example below shows how an input_format_t enum value is passed to sax_parse to set the input format to CBOR.

    #include <iostream>\n#include <iomanip>\n#include <sstream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\n// a simple event consumer that collects string representations of the passed\n// values; note inheriting from json::json_sax_t is not required, but can\n// help not to forget a required function\nclass sax_event_consumer : public json::json_sax_t\n{\n  public:\n    std::vector<std::string> events;\n\n    bool null() override\n    {\n        events.push_back(\"null()\");\n        return true;\n    }\n\n    bool boolean(bool val) override\n    {\n        events.push_back(\"boolean(val=\" + std::string(val ? \"true\" : \"false\") + \")\");\n        return true;\n    }\n\n    bool number_integer(number_integer_t val) override\n    {\n        events.push_back(\"number_integer(val=\" + std::to_string(val) + \")\");\n        return true;\n    }\n\n    bool number_unsigned(number_unsigned_t val) override\n    {\n        events.push_back(\"number_unsigned(val=\" + std::to_string(val) + \")\");\n        return true;\n    }\n\n    bool number_float(number_float_t val, const string_t& s) override\n    {\n        events.push_back(\"number_float(val=\" + std::to_string(val) + \", s=\" + s + \")\");\n        return true;\n    }\n\n    bool string(string_t& val) override\n    {\n        events.push_back(\"string(val=\" + val + \")\");\n        return true;\n    }\n\n    bool start_object(std::size_t elements) override\n    {\n        events.push_back(\"start_object(elements=\" + std::to_string(elements) + \")\");\n        return true;\n    }\n\n    bool end_object() override\n    {\n        events.push_back(\"end_object()\");\n        return true;\n    }\n\n    bool start_array(std::size_t elements) override\n    {\n        events.push_back(\"start_array(elements=\" + std::to_string(elements) + \")\");\n        return true;\n    }\n\n    bool end_array() override\n    {\n        events.push_back(\"end_array()\");\n        return true;\n    }\n\n    bool key(string_t& val) override\n    {\n        events.push_back(\"key(val=\" + val + \")\");\n        return true;\n    }\n\n    bool binary(json::binary_t& val) override\n    {\n        events.push_back(\"binary(val=[...])\");\n        return true;\n    }\n\n    bool parse_error(std::size_t position, const std::string& last_token, const json::exception& ex) override\n    {\n        events.push_back(\"parse_error(position=\" + std::to_string(position) + \", last_token=\" + last_token + \",\\n            ex=\" + std::string(ex.what()) + \")\");\n        return false;\n    }\n};\n\nint main()\n{\n    // CBOR byte string\n    std::vector<std::uint8_t> vec = {{0x44, 0xcA, 0xfe, 0xba, 0xbe}};\n\n    // create a SAX event consumer object\n    sax_event_consumer sec;\n\n    // parse CBOR\n    bool result = json::sax_parse(vec, &sec, json::input_format_t::cbor);\n\n    // output the recorded events\n    for (auto& event : sec.events)\n    {\n        std::cout << event << \"\\n\";\n    }\n\n    // output the result of sax_parse\n    std::cout << \"\\nresult: \" << std::boolalpha << result << std::endl;\n}\n

    Output:

    binary(val=[...])\n\nresult: true\n
    "},{"location":"api/basic_json/input_format_t/#version-history","title":"Version history","text":"
    • Added in version 3.2.0.
    "},{"location":"api/basic_json/insert/","title":"nlohmann::basic_json::insert","text":"
    // (1)\niterator insert(const_iterator pos, const basic_json& val);\niterator insert(const_iterator pos, basic_json&& val);\n\n// (2)\niterator insert(const_iterator pos, size_type cnt, const basic_json& val);\n\n// (3)\niterator insert(const_iterator pos, const_iterator first, const_iterator last);\n\n// (4)\niterator insert(const_iterator pos, initializer_list_t ilist);\n\n// (5)\nvoid insert(const_iterator first, const_iterator last);\n
    1. Inserts element val into an array before iterator pos.
    2. Inserts cnt copies of val into an array before iterator pos.
    3. Inserts elements from range [first, last) into an array before iterator pos.
    4. Inserts elements from initializer list ilist into an array before iterator pos.
    5. Inserts elements from range [first, last) into an object.
    "},{"location":"api/basic_json/insert/#iterator-invalidation","title":"Iterator invalidation","text":"

    For all cases where an element is added to an array, a reallocation can happen, in which case all iterators (including the end() iterator) and all references to the elements are invalidated. Otherwise, only the end() iterator is invalidated. Also, any iterator or reference after the insertion point will point to the same index, which is now a different value.

    For ordered_json, also adding an element to an object can yield a reallocation which again invalidates all iterators and all references. Also, any iterator or reference after the insertion point will point to the same index, which is now a different value.

    "},{"location":"api/basic_json/insert/#parameters","title":"Parameters","text":"pos (in) iterator before which the content will be inserted; may be the end() iterator val (in) value to insert cnt (in) number of copies of val to insert first (in) the start of the range of elements to insert last (in) the end of the range of elements to insert ilist (in) initializer list to insert the values from"},{"location":"api/basic_json/insert/#return-value","title":"Return value","text":"
    1. iterator pointing to the inserted val.
    2. iterator pointing to the first element inserted, or pos if cnt==0
    3. iterator pointing to the first element inserted, or pos if first==last
    4. iterator pointing to the first element inserted, or pos if ilist is empty
    5. (none)
    "},{"location":"api/basic_json/insert/#exception-safety","title":"Exception safety","text":"

    Strong exception safety: if an exception occurs, the original value stays intact.

    "},{"location":"api/basic_json/insert/#exceptions","title":"Exceptions","text":"
    1. The function can throw the following exceptions:
      • Throws type_error.309 if called on JSON values other than arrays; example: \"cannot use insert() with string\"
      • Throws invalid_iterator.202 if called on an iterator which does not belong to the current JSON value; example: \"iterator does not fit current value\"
    2. The function can throw the following exceptions:
      • Throws type_error.309 if called on JSON values other than arrays; example: \"cannot use insert() with string\"
      • Throws invalid_iterator.202 if called on an iterator which does not belong to the current JSON value; example: \"iterator does not fit current value\"
    3. The function can throw the following exceptions:
      • Throws type_error.309 if called on JSON values other than arrays; example: \"cannot use insert() with string\"
      • Throws invalid_iterator.202 if called on an iterator which does not belong to the current JSON value; example: \"iterator does not fit current value\"
      • Throws invalid_iterator.210 if first and last do not belong to the same JSON value; example: \"iterators do not fit\"
      • Throws invalid_iterator.211 if first or last are iterators into container for which insert is called; example: \"passed iterators may not belong to container\"
    4. The function can throw the following exceptions:
      • Throws type_error.309 if called on JSON values other than arrays; example: \"cannot use insert() with string\"
      • Throws invalid_iterator.202 if called on an iterator which does not belong to the current JSON value; example: \"iterator does not fit current value\"
    5. The function can throw the following exceptions:
      • Throws type_error.309 if called on JSON values other than objects; example: \"cannot use insert() with string\"
      • Throws invalid_iterator.202 if called on an iterator which does not belong to the current JSON value; example: \"iterator does not fit current value\"
      • Throws invalid_iterator.210 if first and last do not belong to the same JSON value; example: \"iterators do not fit\"
    "},{"location":"api/basic_json/insert/#complexity","title":"Complexity","text":"
    1. Constant plus linear in the distance between pos and end of the container.
    2. Linear in cnt plus linear in the distance between pos and end of the container.
    3. Linear in std::distance(first, last) plus linear in the distance between pos and end of the container.
    4. Linear in ilist.size() plus linear in the distance between pos and end of the container.
    5. Logarithmic: O(N*log(size() + N)), where N is the number of elements to insert.
    "},{"location":"api/basic_json/insert/#examples","title":"Examples","text":"Example (1): insert element into array

    The example shows how insert() is used.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // create a JSON array\n    json v = {1, 2, 3, 4};\n\n    // insert number 10 before number 3\n    auto new_pos = v.insert(v.begin() + 2, 10);\n\n    // output new array and result of insert call\n    std::cout << *new_pos << '\\n';\n    std::cout << v << '\\n';\n}\n

    Output:

    10\n[1,2,10,3,4]\n
    Example (2): insert copies of element into array

    The example shows how insert() is used.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // create a JSON array\n    json v = {1, 2, 3, 4};\n\n    // insert number 7 copies of number 7 before number 3\n    auto new_pos = v.insert(v.begin() + 2, 7, 7);\n\n    // output new array and result of insert call\n    std::cout << *new_pos << '\\n';\n    std::cout << v << '\\n';\n}\n

    Output:

    7\n[1,2,7,7,7,7,7,7,7,3,4]\n
    Example (3): insert a range of elements into an array

    The example shows how insert() is used.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // create a JSON array\n    json v = {1, 2, 3, 4};\n\n    // create a JSON array to copy values from\n    json v2 = {\"one\", \"two\", \"three\", \"four\"};\n\n    // insert range from v2 before the end of array v\n    auto new_pos = v.insert(v.end(), v2.begin(), v2.end());\n\n    // output new array and result of insert call\n    std::cout << *new_pos << '\\n';\n    std::cout << v << '\\n';\n}\n

    Output:

    \"one\"\n[1,2,3,4,\"one\",\"two\",\"three\",\"four\"]\n
    Example (4): insert elements from an initializer list into an array

    The example shows how insert() is used.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // create a JSON array\n    json v = {1, 2, 3, 4};\n\n    // insert range from v2 before the end of array v\n    auto new_pos = v.insert(v.end(), {7, 8, 9});\n\n    // output new array and result of insert call\n    std::cout << *new_pos << '\\n';\n    std::cout << v << '\\n';\n}\n

    Output:

    7\n[1,2,3,4,7,8,9]\n
    Example (5): insert a range of elements into an object

    The example shows how insert() is used.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // create two JSON objects\n    json j1 = {{\"one\", \"eins\"}, {\"two\", \"zwei\"}};\n    json j2 = {{\"eleven\", \"elf\"}, {\"seventeen\", \"siebzehn\"}};\n\n    // output objects\n    std::cout << j1 << '\\n';\n    std::cout << j2 << '\\n';\n\n    // insert range from j2 to j1\n    j1.insert(j2.begin(), j2.end());\n\n    // output result of insert call\n    std::cout << j1 << '\\n';\n}\n

    Output:

    {\"one\":\"eins\",\"two\":\"zwei\"}\n{\"eleven\":\"elf\",\"seventeen\":\"siebzehn\"}\n{\"eleven\":\"elf\",\"one\":\"eins\",\"seventeen\":\"siebzehn\",\"two\":\"zwei\"}\n
    "},{"location":"api/basic_json/insert/#version-history","title":"Version history","text":"
    1. Added in version 1.0.0.
    2. Added in version 1.0.0.
    3. Added in version 1.0.0.
    4. Added in version 1.0.0.
    5. Added in version 3.0.0.
    "},{"location":"api/basic_json/invalid_iterator/","title":"nlohmann::basic_json::invalid_iterator","text":"
    class invalid_iterator : public exception;\n

    This exception is thrown if iterators passed to a library function do not match the expected semantics.

    Exceptions have ids 2xx (see list of iterator errors).

    classDiagram\n  direction LR\n\n    class std_exception [\"std::exception\"] {\n        <<interface>>\n    }\n\n    class json_exception [\"basic_json::exception\"] {\n        +const int id\n        +const char* what() const\n    }\n\n    class json_parse_error [\"basic_json::parse_error\"] {\n        +const std::size_t byte\n    }\n\n    class json_invalid_iterator [\"basic_json::invalid_iterator\"]\n    class json_type_error [\"basic_json::type_error\"]\n    class json_out_of_range [\"basic_json::out_of_range\"]\n    class json_other_error [\"basic_json::other_error\"]\n\n    std_exception <|-- json_exception\n    json_exception <|-- json_parse_error\n    json_exception <|-- json_invalid_iterator\n    json_exception <|-- json_type_error\n    json_exception <|-- json_out_of_range\n    json_exception <|-- json_other_error\n\n    style json_invalid_iterator fill:#CCCCFF
    "},{"location":"api/basic_json/invalid_iterator/#member-functions","title":"Member functions","text":"
    • what - returns explanatory string
    "},{"location":"api/basic_json/invalid_iterator/#member-variables","title":"Member variables","text":"
    • id - the id of the exception
    "},{"location":"api/basic_json/invalid_iterator/#examples","title":"Examples","text":"Example

    The following code shows how a invalid_iterator exception can be caught.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    try\n    {\n        // calling iterator::key() on non-object iterator\n        json j = \"string\";\n        json::iterator it = j.begin();\n        auto k = it.key();\n    }\n    catch (const json::invalid_iterator& e)\n    {\n        // output exception information\n        std::cout << \"message: \" << e.what() << '\\n'\n                  << \"exception id: \" << e.id << std::endl;\n    }\n}\n

    Output:

    message: [json.exception.invalid_iterator.207] cannot use key() for non-object iterators\nexception id: 207\n
    "},{"location":"api/basic_json/invalid_iterator/#see-also","title":"See also","text":"
    • List of iterator errors
    • parse_error for exceptions indicating a parse error
    • type_error for exceptions indicating executing a member function with a wrong type
    • out_of_range for exceptions indicating access out of the defined range
    • other_error for exceptions indicating other library errors
    "},{"location":"api/basic_json/invalid_iterator/#version-history","title":"Version history","text":"
    • Since version 3.0.0.
    "},{"location":"api/basic_json/is_array/","title":"nlohmann::basic_json::is_array","text":"
    constexpr bool is_array() const noexcept;\n

    This function returns true if and only if the JSON value is an array.

    "},{"location":"api/basic_json/is_array/#return-value","title":"Return value","text":"

    true if type is an array, false otherwise.

    "},{"location":"api/basic_json/is_array/#exception-safety","title":"Exception safety","text":"

    No-throw guarantee: this member function never throws exceptions.

    "},{"location":"api/basic_json/is_array/#complexity","title":"Complexity","text":"

    Constant.

    "},{"location":"api/basic_json/is_array/#examples","title":"Examples","text":"Example

    The following code exemplifies is_array() for all JSON types.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // create JSON values\n    json j_null;\n    json j_boolean = true;\n    json j_number_integer = 17;\n    json j_number_unsigned_integer = 12345678987654321u;\n    json j_number_float = 23.42;\n    json j_object = {{\"one\", 1}, {\"two\", 2}};\n    json j_array = {1, 2, 4, 8, 16};\n    json j_string = \"Hello, world\";\n    json j_binary = json::binary({1, 2, 3});\n\n    // call is_array()\n    std::cout << std::boolalpha;\n    std::cout << j_null.is_array() << '\\n';\n    std::cout << j_boolean.is_array() << '\\n';\n    std::cout << j_number_integer.is_array() << '\\n';\n    std::cout << j_number_unsigned_integer.is_array() << '\\n';\n    std::cout << j_number_float.is_array() << '\\n';\n    std::cout << j_object.is_array() << '\\n';\n    std::cout << j_array.is_array() << '\\n';\n    std::cout << j_string.is_array() << '\\n';\n    std::cout << j_binary.is_array() << '\\n';\n}\n

    Output:

    false\nfalse\nfalse\nfalse\nfalse\nfalse\ntrue\nfalse\nfalse\n
    "},{"location":"api/basic_json/is_array/#version-history","title":"Version history","text":"
    • Added in version 1.0.0.
    "},{"location":"api/basic_json/is_binary/","title":"nlohmann::basic_json::is_binary","text":"
    constexpr bool is_binary() const noexcept;\n

    This function returns true if and only if the JSON value is a binary array.

    "},{"location":"api/basic_json/is_binary/#return-value","title":"Return value","text":"

    true if type is binary, false otherwise.

    "},{"location":"api/basic_json/is_binary/#exception-safety","title":"Exception safety","text":"

    No-throw guarantee: this member function never throws exceptions.

    "},{"location":"api/basic_json/is_binary/#complexity","title":"Complexity","text":"

    Constant.

    "},{"location":"api/basic_json/is_binary/#examples","title":"Examples","text":"Example

    The following code exemplifies is_binary() for all JSON types.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // create JSON values\n    json j_null;\n    json j_boolean = true;\n    json j_number_integer = 17;\n    json j_number_unsigned_integer = 12345678987654321u;\n    json j_number_float = 23.42;\n    json j_object = {{\"one\", 1}, {\"two\", 2}};\n    json j_array = {1, 2, 4, 8, 16};\n    json j_string = \"Hello, world\";\n    json j_binary = json::binary({1, 2, 3});\n\n    // call is_binary()\n    std::cout << std::boolalpha;\n    std::cout << j_null.is_binary() << '\\n';\n    std::cout << j_boolean.is_binary() << '\\n';\n    std::cout << j_number_integer.is_binary() << '\\n';\n    std::cout << j_number_unsigned_integer.is_binary() << '\\n';\n    std::cout << j_number_float.is_binary() << '\\n';\n    std::cout << j_object.is_binary() << '\\n';\n    std::cout << j_array.is_binary() << '\\n';\n    std::cout << j_string.is_binary() << '\\n';\n    std::cout << j_binary.is_binary() << '\\n';\n}\n

    Output:

    false\nfalse\nfalse\nfalse\nfalse\nfalse\nfalse\nfalse\ntrue\n
    "},{"location":"api/basic_json/is_binary/#version-history","title":"Version history","text":"
    • Added in version 3.8.0.
    "},{"location":"api/basic_json/is_boolean/","title":"nlohmann::basic_json::is_boolean","text":"
    constexpr bool is_boolean() const noexcept;\n

    This function returns true if and only if the JSON value is true or false.

    "},{"location":"api/basic_json/is_boolean/#return-value","title":"Return value","text":"

    true if type is boolean, false otherwise.

    "},{"location":"api/basic_json/is_boolean/#exception-safety","title":"Exception safety","text":"

    No-throw guarantee: this member function never throws exceptions.

    "},{"location":"api/basic_json/is_boolean/#complexity","title":"Complexity","text":"

    Constant.

    "},{"location":"api/basic_json/is_boolean/#examples","title":"Examples","text":"Example

    The following code exemplifies is_boolean() for all JSON types.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // create JSON values\n    json j_null;\n    json j_boolean = true;\n    json j_number_integer = 17;\n    json j_number_unsigned_integer = 12345678987654321u;\n    json j_number_float = 23.42;\n    json j_object = {{\"one\", 1}, {\"two\", 2}};\n    json j_array = {1, 2, 4, 8, 16};\n    json j_string = \"Hello, world\";\n    json j_binary = json::binary({1, 2, 3});\n\n    // call is_boolean()\n    std::cout << std::boolalpha;\n    std::cout << j_null.is_boolean() << '\\n';\n    std::cout << j_boolean.is_boolean() << '\\n';\n    std::cout << j_number_integer.is_boolean() << '\\n';\n    std::cout << j_number_unsigned_integer.is_boolean() << '\\n';\n    std::cout << j_number_float.is_boolean() << '\\n';\n    std::cout << j_object.is_boolean() << '\\n';\n    std::cout << j_array.is_boolean() << '\\n';\n    std::cout << j_string.is_boolean() << '\\n';\n    std::cout << j_binary.is_boolean() << '\\n';\n}\n

    Output:

    false\ntrue\nfalse\nfalse\nfalse\nfalse\nfalse\nfalse\nfalse\n
    "},{"location":"api/basic_json/is_boolean/#version-history","title":"Version history","text":"
    • Added in version 1.0.0.
    "},{"location":"api/basic_json/is_discarded/","title":"nlohmann::basic_json::is_discarded","text":"
    constexpr bool is_discarded() const noexcept;\n

    This function returns true for a JSON value if either:

    • the value was discarded during parsing with a callback function (see parser_callback_t), or
    • the value is the result of parsing invalid JSON with parameter allow_exceptions set to false; see parse for more information.
    "},{"location":"api/basic_json/is_discarded/#return-value","title":"Return value","text":"

    true if type is discarded, false otherwise.

    "},{"location":"api/basic_json/is_discarded/#exception-safety","title":"Exception safety","text":"

    No-throw guarantee: this member function never throws exceptions.

    "},{"location":"api/basic_json/is_discarded/#complexity","title":"Complexity","text":"

    Constant.

    "},{"location":"api/basic_json/is_discarded/#notes","title":"Notes","text":"

    Comparisons

    Discarded values are never compared equal with operator==. That is, checking whether a JSON value j is discarded will only work via:

    j.is_discarded()\n

    because

    j == json::value_t::discarded\n

    will always be false.

    Removal during parsing with callback functions

    When a value is discarded by a callback function (see parser_callback_t) during parsing, then it is removed when it is part of a structured value. For instance, if the second value of an array is discarded, instead of [null, discarded, false], the array [null, false] is returned. Only if the top-level value is discarded, the return value of the parse call is discarded.

    This function will always be false for JSON values after parsing. That is, discarded values can only occur during parsing, but will be removed when inside a structured value or replaced by null in other cases.

    "},{"location":"api/basic_json/is_discarded/#examples","title":"Examples","text":"Example

    The following code exemplifies is_discarded() for all JSON types.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // create JSON values\n    json j_null;\n    json j_boolean = true;\n    json j_number_integer = 17;\n    json j_number_unsigned_integer = 12345678987654321u;\n    json j_number_float = 23.42;\n    json j_object = {{\"one\", 1}, {\"two\", 2}};\n    json j_array = {1, 2, 4, 8, 16};\n    json j_string = \"Hello, world\";\n    json j_binary = json::binary({1, 2, 3});\n\n    // call is_discarded()\n    std::cout << std::boolalpha;\n    std::cout << j_null.is_discarded() << '\\n';\n    std::cout << j_boolean.is_discarded() << '\\n';\n    std::cout << j_number_integer.is_discarded() << '\\n';\n    std::cout << j_number_unsigned_integer.is_discarded() << '\\n';\n    std::cout << j_number_float.is_discarded() << '\\n';\n    std::cout << j_object.is_discarded() << '\\n';\n    std::cout << j_array.is_discarded() << '\\n';\n    std::cout << j_string.is_discarded() << '\\n';\n    std::cout << j_binary.is_discarded() << '\\n';\n}\n

    Output:

    false\nfalse\nfalse\nfalse\nfalse\nfalse\nfalse\nfalse\nfalse\n
    "},{"location":"api/basic_json/is_discarded/#version-history","title":"Version history","text":"
    • Added in version 1.0.0.
    "},{"location":"api/basic_json/is_null/","title":"nlohmann::basic_json::is_null","text":"
    constexpr bool is_null() const noexcept;\n

    This function returns true if and only if the JSON value is null.

    "},{"location":"api/basic_json/is_null/#return-value","title":"Return value","text":"

    true if type is null, false otherwise.

    "},{"location":"api/basic_json/is_null/#exception-safety","title":"Exception safety","text":"

    No-throw guarantee: this member function never throws exceptions.

    "},{"location":"api/basic_json/is_null/#complexity","title":"Complexity","text":"

    Constant.

    "},{"location":"api/basic_json/is_null/#examples","title":"Examples","text":"Example

    The following code exemplifies is_null() for all JSON types.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // create JSON values\n    json j_null;\n    json j_boolean = true;\n    json j_number_integer = 17;\n    json j_number_unsigned_integer = 12345678987654321u;\n    json j_number_float = 23.42;\n    json j_object = {{\"one\", 1}, {\"two\", 2}};\n    json j_array = {1, 2, 4, 8, 16};\n    json j_string = \"Hello, world\";\n    json j_binary = json::binary({1, 2, 3});\n\n    // call is_null()\n    std::cout << std::boolalpha;\n    std::cout << j_null.is_null() << '\\n';\n    std::cout << j_boolean.is_null() << '\\n';\n    std::cout << j_number_integer.is_null() << '\\n';\n    std::cout << j_number_unsigned_integer.is_null() << '\\n';\n    std::cout << j_number_float.is_null() << '\\n';\n    std::cout << j_object.is_null() << '\\n';\n    std::cout << j_array.is_null() << '\\n';\n    std::cout << j_string.is_null() << '\\n';\n    std::cout << j_binary.is_null() << '\\n';\n}\n

    Output:

    true\nfalse\nfalse\nfalse\nfalse\nfalse\nfalse\nfalse\nfalse\n
    "},{"location":"api/basic_json/is_null/#version-history","title":"Version history","text":"
    • Added in version 1.0.0.
    "},{"location":"api/basic_json/is_number/","title":"nlohmann::basic_json::is_number","text":"
    constexpr bool is_number() const noexcept;\n

    This function returns true if and only if the JSON value is a number. This includes both integer (signed and unsigned) and floating-point values.

    "},{"location":"api/basic_json/is_number/#return-value","title":"Return value","text":"

    true if type is number (regardless whether integer, unsigned integer, or floating-type), false otherwise.

    "},{"location":"api/basic_json/is_number/#exception-safety","title":"Exception safety","text":"

    No-throw guarantee: this member function never throws exceptions.

    "},{"location":"api/basic_json/is_number/#complexity","title":"Complexity","text":"

    Constant.

    "},{"location":"api/basic_json/is_number/#possible-implementation","title":"Possible implementation","text":"
    constexpr bool is_number() const noexcept\n{\n    return is_number_integer() || is_number_float();\n}\n
    "},{"location":"api/basic_json/is_number/#examples","title":"Examples","text":"Example

    The following code exemplifies is_number() for all JSON types.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // create JSON values\n    json j_null;\n    json j_boolean = true;\n    json j_number_integer = 17;\n    json j_number_unsigned_integer = 12345678987654321u;\n    json j_number_float = 23.42;\n    json j_object = {{\"one\", 1}, {\"two\", 2}};\n    json j_array = {1, 2, 4, 8, 16};\n    json j_string = \"Hello, world\";\n    json j_binary = json::binary({1, 2, 3});\n\n    // call is_number()\n    std::cout << std::boolalpha;\n    std::cout << j_null.is_number() << '\\n';\n    std::cout << j_boolean.is_number() << '\\n';\n    std::cout << j_number_integer.is_number() << '\\n';\n    std::cout << j_number_unsigned_integer.is_number() << '\\n';\n    std::cout << j_number_float.is_number() << '\\n';\n    std::cout << j_object.is_number() << '\\n';\n    std::cout << j_array.is_number() << '\\n';\n    std::cout << j_string.is_number() << '\\n';\n    std::cout << j_binary.is_number() << '\\n';\n}\n

    Output:

    false\nfalse\ntrue\ntrue\ntrue\nfalse\nfalse\nfalse\nfalse\n
    "},{"location":"api/basic_json/is_number/#see-also","title":"See also","text":"
    • is_number_integer() check if the value is an integer or unsigned integer number
    • is_number_unsigned() check if the value is an unsigned integer number
    • is_number_float() check if the value is a floating-point number
    "},{"location":"api/basic_json/is_number/#version-history","title":"Version history","text":"
    • Added in version 1.0.0.
    • Extended to also return true for unsigned integers in 2.0.0.
    "},{"location":"api/basic_json/is_number_float/","title":"nlohmann::basic_json::is_number_float","text":"
    constexpr bool is_number_float() const noexcept;\n

    This function returns true if and only if the JSON value is a floating-point number. This excludes signed and unsigned integer values.

    "},{"location":"api/basic_json/is_number_float/#return-value","title":"Return value","text":"

    true if type is a floating-point number, false otherwise.

    "},{"location":"api/basic_json/is_number_float/#exception-safety","title":"Exception safety","text":"

    No-throw guarantee: this member function never throws exceptions.

    "},{"location":"api/basic_json/is_number_float/#complexity","title":"Complexity","text":"

    Constant.

    "},{"location":"api/basic_json/is_number_float/#examples","title":"Examples","text":"Example

    The following code exemplifies is_number_float() for all JSON types.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // create JSON values\n    json j_null;\n    json j_boolean = true;\n    json j_number_integer = 17;\n    json j_number_unsigned_integer = 12345678987654321u;\n    json j_number_float = 23.42;\n    json j_object = {{\"one\", 1}, {\"two\", 2}};\n    json j_array = {1, 2, 4, 8, 16};\n    json j_string = \"Hello, world\";\n    json j_binary = json::binary({1, 2, 3});\n\n    // call is_number_float()\n    std::cout << std::boolalpha;\n    std::cout << j_null.is_number_float() << '\\n';\n    std::cout << j_boolean.is_number_float() << '\\n';\n    std::cout << j_number_integer.is_number_float() << '\\n';\n    std::cout << j_number_unsigned_integer.is_number_float() << '\\n';\n    std::cout << j_number_float.is_number_float() << '\\n';\n    std::cout << j_object.is_number_float() << '\\n';\n    std::cout << j_array.is_number_float() << '\\n';\n    std::cout << j_string.is_number_float() << '\\n';\n    std::cout << j_binary.is_number_float() << '\\n';\n}\n

    Output:

    false\nfalse\nfalse\nfalse\ntrue\nfalse\nfalse\nfalse\nfalse\n
    "},{"location":"api/basic_json/is_number_float/#see-also","title":"See also","text":"
    • is_number() check if the value is a number
    • is_number_integer() check if the value is an integer or unsigned integer number
    • is_number_unsigned() check if the value is an unsigned integer number
    "},{"location":"api/basic_json/is_number_float/#version-history","title":"Version history","text":"
    • Added in version 1.0.0.
    "},{"location":"api/basic_json/is_number_integer/","title":"nlohmann::basic_json::is_number_integer","text":"
    constexpr bool is_number_integer() const noexcept;\n

    This function returns true if and only if the JSON value is a signed or unsigned integer number. This excludes floating-point values.

    "},{"location":"api/basic_json/is_number_integer/#return-value","title":"Return value","text":"

    true if type is an integer or unsigned integer number, false otherwise.

    "},{"location":"api/basic_json/is_number_integer/#exception-safety","title":"Exception safety","text":"

    No-throw guarantee: this member function never throws exceptions.

    "},{"location":"api/basic_json/is_number_integer/#complexity","title":"Complexity","text":"

    Constant.

    "},{"location":"api/basic_json/is_number_integer/#examples","title":"Examples","text":"Example

    The following code exemplifies is_number_integer() for all JSON types.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // create JSON values\n    json j_null;\n    json j_boolean = true;\n    json j_number_integer = 17;\n    json j_number_unsigned_integer = 12345678987654321u;\n    json j_number_float = 23.42;\n    json j_object = {{\"one\", 1}, {\"two\", 2}};\n    json j_array = {1, 2, 4, 8, 16};\n    json j_string = \"Hello, world\";\n    json j_binary = json::binary({1, 2, 3});\n\n    // call is_number_integer()\n    std::cout << std::boolalpha;\n    std::cout << j_null.is_number_integer() << '\\n';\n    std::cout << j_boolean.is_number_integer() << '\\n';\n    std::cout << j_number_integer.is_number_integer() << '\\n';\n    std::cout << j_number_unsigned_integer.is_number_integer() << '\\n';\n    std::cout << j_number_float.is_number_integer() << '\\n';\n    std::cout << j_object.is_number_integer() << '\\n';\n    std::cout << j_array.is_number_integer() << '\\n';\n    std::cout << j_string.is_number_integer() << '\\n';\n    std::cout << j_binary.is_number_integer() << '\\n';\n}\n

    Output:

    false\nfalse\ntrue\ntrue\nfalse\nfalse\nfalse\nfalse\nfalse\n
    "},{"location":"api/basic_json/is_number_integer/#see-also","title":"See also","text":"
    • is_number() check if the value is a number
    • is_number_unsigned() check if the value is an unsigned integer number
    • is_number_float() check if the value is a floating-point number
    "},{"location":"api/basic_json/is_number_integer/#version-history","title":"Version history","text":"
    • Added in version 1.0.0.
    • Extended to also return true for unsigned integers in 2.0.0.
    "},{"location":"api/basic_json/is_number_unsigned/","title":"nlohmann::basic_json::is_number_unsigned","text":"
    constexpr bool is_number_unsigned() const noexcept;\n

    This function returns true if and only if the JSON value is an unsigned integer number. This excludes floating-point and signed integer values.

    "},{"location":"api/basic_json/is_number_unsigned/#return-value","title":"Return value","text":"

    true if type is an unsigned integer number, false otherwise.

    "},{"location":"api/basic_json/is_number_unsigned/#exception-safety","title":"Exception safety","text":"

    No-throw guarantee: this member function never throws exceptions.

    "},{"location":"api/basic_json/is_number_unsigned/#complexity","title":"Complexity","text":"

    Constant.

    "},{"location":"api/basic_json/is_number_unsigned/#examples","title":"Examples","text":"Example

    The following code exemplifies is_number_unsigned() for all JSON types.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // create JSON values\n    json j_null;\n    json j_boolean = true;\n    json j_number_integer = 17;\n    json j_number_unsigned_integer = 12345678987654321u;\n    json j_number_float = 23.42;\n    json j_object = {{\"one\", 1}, {\"two\", 2}};\n    json j_array = {1, 2, 4, 8, 16};\n    json j_string = \"Hello, world\";\n    json j_binary = json::binary({1, 2, 3});\n\n    // call is_number_unsigned()\n    std::cout << std::boolalpha;\n    std::cout << j_null.is_number_unsigned() << '\\n';\n    std::cout << j_boolean.is_number_unsigned() << '\\n';\n    std::cout << j_number_integer.is_number_unsigned() << '\\n';\n    std::cout << j_number_unsigned_integer.is_number_unsigned() << '\\n';\n    std::cout << j_number_float.is_number_unsigned() << '\\n';\n    std::cout << j_object.is_number_unsigned() << '\\n';\n    std::cout << j_array.is_number_unsigned() << '\\n';\n    std::cout << j_string.is_number_unsigned() << '\\n';\n    std::cout << j_binary.is_number_unsigned() << '\\n';\n}\n

    Output:

    false\nfalse\nfalse\ntrue\nfalse\nfalse\nfalse\nfalse\nfalse\n
    "},{"location":"api/basic_json/is_number_unsigned/#see-also","title":"See also","text":"
    • is_number() check if the value is a number
    • is_number_integer() check if the value is an integer or unsigned integer number
    • is_number_float() check if the value is a floating-point number
    "},{"location":"api/basic_json/is_number_unsigned/#version-history","title":"Version history","text":"
    • Added in version 2.0.0.
    "},{"location":"api/basic_json/is_object/","title":"nlohmann::basic_json::is_object","text":"
    constexpr bool is_object() const noexcept;\n

    This function returns true if and only if the JSON value is an object.

    "},{"location":"api/basic_json/is_object/#return-value","title":"Return value","text":"

    true if type is an object, false otherwise.

    "},{"location":"api/basic_json/is_object/#exception-safety","title":"Exception safety","text":"

    No-throw guarantee: this member function never throws exceptions.

    "},{"location":"api/basic_json/is_object/#complexity","title":"Complexity","text":"

    Constant.

    "},{"location":"api/basic_json/is_object/#examples","title":"Examples","text":"Example

    The following code exemplifies is_object() for all JSON types.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // create JSON values\n    json j_null;\n    json j_boolean = true;\n    json j_number_integer = 17;\n    json j_number_float = 23.42;\n    json j_number_unsigned_integer = 12345678987654321u;\n    json j_object = {{\"one\", 1}, {\"two\", 2}};\n    json j_array = {1, 2, 4, 8, 16};\n    json j_string = \"Hello, world\";\n    json j_binary = json::binary({1, 2, 3});\n\n    // call is_object()\n    std::cout << std::boolalpha;\n    std::cout << j_null.is_object() << '\\n';\n    std::cout << j_boolean.is_object() << '\\n';\n    std::cout << j_number_integer.is_object() << '\\n';\n    std::cout << j_number_unsigned_integer.is_object() << '\\n';\n    std::cout << j_number_float.is_object() << '\\n';\n    std::cout << j_object.is_object() << '\\n';\n    std::cout << j_array.is_object() << '\\n';\n    std::cout << j_string.is_object() << '\\n';\n    std::cout << j_binary.is_object() << '\\n';\n}\n

    Output:

    false\nfalse\nfalse\nfalse\nfalse\ntrue\nfalse\nfalse\nfalse\n
    "},{"location":"api/basic_json/is_object/#version-history","title":"Version history","text":"
    • Added in version 1.0.0.
    "},{"location":"api/basic_json/is_primitive/","title":"nlohmann::basic_json::is_primitive","text":"
    constexpr bool is_primitive() const noexcept;\n

    This function returns true if and only if the JSON type is primitive (string, number, boolean, null, binary).

    "},{"location":"api/basic_json/is_primitive/#return-value","title":"Return value","text":"

    true if type is primitive (string, number, boolean, null, or binary), false otherwise.

    "},{"location":"api/basic_json/is_primitive/#exception-safety","title":"Exception safety","text":"

    No-throw guarantee: this member function never throws exceptions.

    "},{"location":"api/basic_json/is_primitive/#complexity","title":"Complexity","text":"

    Constant.

    "},{"location":"api/basic_json/is_primitive/#possible-implementation","title":"Possible implementation","text":"
    constexpr bool is_primitive() const noexcept\n{\n    return is_null() || is_string() || is_boolean() || is_number() || is_binary();\n}\n
    "},{"location":"api/basic_json/is_primitive/#notes","title":"Notes","text":"

    The term primitive stems from RFC 8259:

    JSON can represent four primitive types (strings, numbers, booleans, and null) and two structured types (objects and arrays).

    This library extends primitive types to binary types, because binary types are roughly comparable to strings. Hence, is_primitive() returns true for binary values.

    "},{"location":"api/basic_json/is_primitive/#examples","title":"Examples","text":"Example

    The following code exemplifies is_primitive() for all JSON types.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // create JSON values\n    json j_null;\n    json j_boolean = true;\n    json j_number_integer = 17;\n    json j_number_float = 23.42;\n    json j_number_unsigned_integer = 12345678987654321u;\n    json j_object = {{\"one\", 1}, {\"two\", 2}};\n    json j_array = {1, 2, 4, 8, 16};\n    json j_string = \"Hello, world\";\n    json j_binary = json::binary({1, 2, 3});\n\n    // call is_primitive()\n    std::cout << std::boolalpha;\n    std::cout << j_null.is_primitive() << '\\n';\n    std::cout << j_boolean.is_primitive() << '\\n';\n    std::cout << j_number_integer.is_primitive() << '\\n';\n    std::cout << j_number_unsigned_integer.is_primitive() << '\\n';\n    std::cout << j_number_float.is_primitive() << '\\n';\n    std::cout << j_object.is_primitive() << '\\n';\n    std::cout << j_array.is_primitive() << '\\n';\n    std::cout << j_string.is_primitive() << '\\n';\n    std::cout << j_binary.is_primitive() << '\\n';\n}\n

    Output:

    true\ntrue\ntrue\ntrue\ntrue\nfalse\nfalse\ntrue\ntrue\n
    "},{"location":"api/basic_json/is_primitive/#see-also","title":"See also","text":"
    • is_structured() returns whether the JSON value is structured
    • is_null() returns whether the JSON value is null
    • is_string() returns whether the JSON value is a string
    • is_boolean() returns whether the JSON value is a boolean
    • is_number() returns whether the JSON value is a number
    • is_binary() returns whether the JSON value is a binary array
    "},{"location":"api/basic_json/is_primitive/#version-history","title":"Version history","text":"
    • Added in version 1.0.0.
    • Extended to return true for binary types in version 3.8.0.
    "},{"location":"api/basic_json/is_string/","title":"nlohmann::basic_json::is_string","text":"
    constexpr bool is_string() const noexcept;\n

    This function returns true if and only if the JSON value is a string.

    "},{"location":"api/basic_json/is_string/#return-value","title":"Return value","text":"

    true if type is a string, false otherwise.

    "},{"location":"api/basic_json/is_string/#exception-safety","title":"Exception safety","text":"

    No-throw guarantee: this member function never throws exceptions.

    "},{"location":"api/basic_json/is_string/#complexity","title":"Complexity","text":"

    Constant.

    "},{"location":"api/basic_json/is_string/#examples","title":"Examples","text":"Example

    The following code exemplifies is_string() for all JSON types.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // create JSON values\n    json j_null;\n    json j_boolean = true;\n    json j_number_integer = 17;\n    json j_number_float = 23.42;\n    json j_number_unsigned_integer = 12345678987654321u;\n    json j_object = {{\"one\", 1}, {\"two\", 2}};\n    json j_array = {1, 2, 4, 8, 16};\n    json j_string = \"Hello, world\";\n    json j_binary = json::binary({1, 2, 3});\n\n    // call is_string()\n    std::cout << std::boolalpha;\n    std::cout << j_null.is_string() << '\\n';\n    std::cout << j_boolean.is_string() << '\\n';\n    std::cout << j_number_integer.is_string() << '\\n';\n    std::cout << j_number_unsigned_integer.is_string() << '\\n';\n    std::cout << j_number_float.is_string() << '\\n';\n    std::cout << j_object.is_string() << '\\n';\n    std::cout << j_array.is_string() << '\\n';\n    std::cout << j_string.is_string() << '\\n';\n    std::cout << j_binary.is_string() << '\\n';\n}\n

    Output:

    false\nfalse\nfalse\nfalse\nfalse\nfalse\nfalse\ntrue\nfalse\n
    "},{"location":"api/basic_json/is_string/#version-history","title":"Version history","text":"
    • Added in version 1.0.0.
    "},{"location":"api/basic_json/is_structured/","title":"nlohmann::basic_json::is_structured","text":"
    constexpr bool is_structured() const noexcept;\n

    This function returns true if and only if the JSON type is structured (array or object).

    "},{"location":"api/basic_json/is_structured/#return-value","title":"Return value","text":"

    true if type is structured (array or object), false otherwise.

    "},{"location":"api/basic_json/is_structured/#exception-safety","title":"Exception safety","text":"

    No-throw guarantee: this member function never throws exceptions.

    "},{"location":"api/basic_json/is_structured/#complexity","title":"Complexity","text":"

    Constant.

    "},{"location":"api/basic_json/is_structured/#possible-implementation","title":"Possible implementation","text":"
    constexpr bool is_structured() const noexcept\n{\n    return is_array() || is_object();\n}\n
    "},{"location":"api/basic_json/is_structured/#notes","title":"Notes","text":"

    The term structured stems from RFC 8259:

    JSON can represent four primitive types (strings, numbers, booleans, and null) and two structured types (objects and arrays).

    Note that though strings are containers in C++, they are treated as primitive values in JSON.

    "},{"location":"api/basic_json/is_structured/#examples","title":"Examples","text":"Example

    The following code exemplifies is_structured() for all JSON types.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // create JSON values\n    json j_null;\n    json j_boolean = true;\n    json j_number_integer = 17;\n    json j_number_float = 23.42;\n    json j_number_unsigned_integer = 12345678987654321u;\n    json j_object = {{\"one\", 1}, {\"two\", 2}};\n    json j_array = {1, 2, 4, 8, 16};\n    json j_string = \"Hello, world\";\n    json j_binary = json::binary({1, 2, 3});\n\n    // call is_structured()\n    std::cout << std::boolalpha;\n    std::cout << j_null.is_structured() << '\\n';\n    std::cout << j_boolean.is_structured() << '\\n';\n    std::cout << j_number_integer.is_structured() << '\\n';\n    std::cout << j_number_unsigned_integer.is_structured() << '\\n';\n    std::cout << j_number_float.is_structured() << '\\n';\n    std::cout << j_object.is_structured() << '\\n';\n    std::cout << j_array.is_structured() << '\\n';\n    std::cout << j_string.is_structured() << '\\n';\n    std::cout << j_binary.is_structured() << '\\n';\n}\n

    Output:

    false\nfalse\nfalse\nfalse\nfalse\ntrue\ntrue\nfalse\nfalse\n
    "},{"location":"api/basic_json/is_structured/#see-also","title":"See also","text":"
    • is_primitive() returns whether JSON value is primitive
    • is_array() returns whether the value is an array
    • is_object() returns whether the value is an object
    "},{"location":"api/basic_json/is_structured/#version-history","title":"Version history","text":"
    • Added in version 1.0.0.
    "},{"location":"api/basic_json/items/","title":"nlohmann::basic_json::items","text":"
    iteration_proxy<iterator> items() noexcept;\niteration_proxy<const_iterator> items() const noexcept;\n

    This function allows accessing iterator::key() and iterator::value() during range-based for loops. In these loops, a reference to the JSON values is returned, so there is no access to the underlying iterator.

    For loop without items() function:

    for (auto it = j_object.begin(); it != j_object.end(); ++it)\n{\n    std::cout << \"key: \" << it.key() << \", value:\" << it.value() << '\\n';\n}\n

    Range-based for loop without items() function:

    for (auto it : j_object)\n{\n    // \"it\" is of type json::reference and has no key() member\n    std::cout << \"value: \" << it << '\\n';\n}\n

    Range-based for loop with items() function:

    for (auto& el : j_object.items())\n{\n    std::cout << \"key: \" << el.key() << \", value:\" << el.value() << '\\n';\n}\n

    The items() function also allows using structured bindings (C++17):

    for (auto& [key, val] : j_object.items())\n{\n    std::cout << \"key: \" << key << \", value:\" << val << '\\n';\n}\n
    "},{"location":"api/basic_json/items/#return-value","title":"Return value","text":"

    iteration proxy object wrapping the current value with an interface to use in range-based for loops

    "},{"location":"api/basic_json/items/#exception-safety","title":"Exception safety","text":"

    Strong guarantee: if an exception is thrown, there are no changes in the JSON value.

    "},{"location":"api/basic_json/items/#complexity","title":"Complexity","text":"

    Constant.

    "},{"location":"api/basic_json/items/#notes","title":"Notes","text":"

    When iterating over an array, key() will return the index of the element as string (see example). For primitive types (e.g., numbers), key() returns an empty string.

    Lifetime issues

    Using items() on temporary objects is dangerous. Make sure the object's lifetime exceeds the iteration. See #2040 for more information.

    "},{"location":"api/basic_json/items/#examples","title":"Examples","text":"Example

    The following code shows an example for items().

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // create JSON values\n    json j_object = {{\"one\", 1}, {\"two\", 2}};\n    json j_array = {1, 2, 4, 8, 16};\n\n    // example for an object\n    for (auto& x : j_object.items())\n    {\n        std::cout << \"key: \" << x.key() << \", value: \" << x.value() << '\\n';\n    }\n\n    // example for an array\n    for (auto& x : j_array.items())\n    {\n        std::cout << \"key: \" << x.key() << \", value: \" << x.value() << '\\n';\n    }\n}\n

    Output:

    key: one, value: 1\nkey: two, value: 2\nkey: 0, value: 1\nkey: 1, value: 2\nkey: 2, value: 4\nkey: 3, value: 8\nkey: 4, value: 16\n
    "},{"location":"api/basic_json/items/#version-history","title":"Version history","text":"
    • Added iterator_wrapper in version 3.0.0.
    • Added items and deprecated iterator_wrapper in version 3.1.0.
    • Added structured binding support in version 3.5.0.

    Deprecation

    This function replaces the static function iterator_wrapper which was introduced in version 1.0.0, but has been deprecated in version 3.1.0. Function iterator_wrapper will be removed in version 4.0.0. Please replace all occurrences of iterator_wrapper(j) with j.items().

    You should be warned by your compiler with a -Wdeprecated-declarations warning if you are using a deprecated function.

    "},{"location":"api/basic_json/json_base_class_t/","title":"nlohmann::basic_json::json_base_class_t","text":"
    using json_base_class_t = detail::json_base_class<CustomBaseClass>;\n

    The base class used to inject custom functionality into each instance of basic_json. Examples of such functionality might be metadata, additional member functions (e.g., visitors), or other application-specific code.

    "},{"location":"api/basic_json/json_base_class_t/#template-parameters","title":"Template parameters","text":"CustomBaseClass the base class to be added to basic_json"},{"location":"api/basic_json/json_base_class_t/#notes","title":"Notes","text":""},{"location":"api/basic_json/json_base_class_t/#default-type","title":"Default type","text":"

    The default value for CustomBaseClass is void. In this case, an empty base class is used and no additional functionality is injected.

    "},{"location":"api/basic_json/json_base_class_t/#limitations","title":"Limitations","text":"

    The type CustomBaseClass has to be a default-constructible class. basic_json only supports copy/move construction/assignment if CustomBaseClass does so as well.

    "},{"location":"api/basic_json/json_base_class_t/#examples","title":"Examples","text":"Example

    The following code shows how to inject custom data and methods for each node.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nclass visitor_adaptor_with_metadata\n{\n  public:\n    template <class Fnc>\n    void visit(const Fnc& fnc) const;\n\n    int metadata = 42;\n  private:\n    template <class Ptr, class Fnc>\n    void do_visit(const Ptr& ptr, const Fnc& fnc) const;\n};\n\nusing json = nlohmann::basic_json <\n             std::map,\n             std::vector,\n             std::string,\n             bool,\n             std::int64_t,\n             std::uint64_t,\n             double,\n             std::allocator,\n             nlohmann::adl_serializer,\n             std::vector<std::uint8_t>,\n             visitor_adaptor_with_metadata\n             >;\n\ntemplate <class Fnc>\nvoid visitor_adaptor_with_metadata::visit(const Fnc& fnc) const\n{\n    do_visit(json::json_pointer{}, fnc);\n}\n\ntemplate <class Ptr, class Fnc>\nvoid visitor_adaptor_with_metadata::do_visit(const Ptr& ptr, const Fnc& fnc) const\n{\n    using value_t = nlohmann::detail::value_t;\n    const json& j = *static_cast<const json*>(this);\n    switch (j.type())\n    {\n        case value_t::object:\n            fnc(ptr, j);\n            for (const auto& entry : j.items())\n            {\n                entry.value().do_visit(ptr / entry.key(), fnc);\n            }\n            break;\n        case value_t::array:\n            fnc(ptr, j);\n            for (std::size_t i = 0; i < j.size(); ++i)\n            {\n                j.at(i).do_visit(ptr / std::to_string(i), fnc);\n            }\n            break;\n        case value_t::null:\n        case value_t::string:\n        case value_t::boolean:\n        case value_t::number_integer:\n        case value_t::number_unsigned:\n        case value_t::number_float:\n        case value_t::binary:\n            fnc(ptr, j);\n            break;\n        case value_t::discarded:\n        default:\n            break;\n    }\n}\n\nint main()\n{\n    // create a json object\n    json j;\n    j[\"null\"];\n    j[\"object\"][\"uint\"] = 1U;\n    j[\"object\"].metadata = 21;\n\n    // visit and output\n    j.visit(\n         [&](const json::json_pointer & p,\n             const json & j)\n    {\n        std::cout << (p.empty() ? std::string{\"/\"} : p.to_string())\n                  << \" - metadata = \" << j.metadata << \" -> \" << j.dump() << '\\n';\n    });\n}\n

    Output:

    / - metadata = 42 -> {\"null\":null,\"object\":{\"uint\":1}}\n/null - metadata = 42 -> null\n/object - metadata = 21 -> {\"uint\":1}\n/object/uint - metadata = 42 -> 1\n
    "},{"location":"api/basic_json/json_base_class_t/#version-history","title":"Version history","text":"
    • Added in version 3.12.0.
    "},{"location":"api/basic_json/json_serializer/","title":"nlohmann::basic_json::json_serializer","text":"
    template<typename T, typename SFINAE>\nusing json_serializer = JSONSerializer<T, SFINAE>;\n
    "},{"location":"api/basic_json/json_serializer/#template-parameters","title":"Template parameters","text":"T type to convert; will be used in the to_json/from_json functions SFINAE type to add compile type checks via SFINAE; usually void"},{"location":"api/basic_json/json_serializer/#notes","title":"Notes","text":""},{"location":"api/basic_json/json_serializer/#default-type","title":"Default type","text":"

    The default values for json_serializer is adl_serializer.

    "},{"location":"api/basic_json/json_serializer/#examples","title":"Examples","text":"Example

    The example below shows how a conversion of a non-default-constructible type is implemented via a specialization of the adl_serializer.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nnamespace ns\n{\n// a simple struct to model a person (not default constructible)\nstruct person\n{\n    person(std::string n, std::string a, int aa)\n        : name(std::move(n)), address(std::move(a)), age(aa)\n    {}\n\n    std::string name;\n    std::string address;\n    int age;\n};\n} // namespace ns\n\nnamespace nlohmann\n{\ntemplate <>\nstruct adl_serializer<ns::person>\n{\n    static ns::person from_json(const json& j)\n    {\n        return {j.at(\"name\"), j.at(\"address\"), j.at(\"age\")};\n    }\n\n    // Here's the catch! You must provide a to_json method! Otherwise, you\n    // will not be able to convert person to json, since you fully\n    // specialized adl_serializer on that type\n    static void to_json(json& j, ns::person p)\n    {\n        j[\"name\"] = p.name;\n        j[\"address\"] = p.address;\n        j[\"age\"] = p.age;\n    }\n};\n} // namespace nlohmann\n\nint main()\n{\n    json j;\n    j[\"name\"] = \"Ned Flanders\";\n    j[\"address\"] = \"744 Evergreen Terrace\";\n    j[\"age\"] = 60;\n\n    auto p = j.template get<ns::person>();\n\n    std::cout << p.name << \" (\" << p.age << \") lives in \" << p.address << std::endl;\n}\n

    Output:

    Ned Flanders (60) lives in 744 Evergreen Terrace\n
    "},{"location":"api/basic_json/json_serializer/#version-history","title":"Version history","text":"
    • Since version 2.0.0.
    "},{"location":"api/basic_json/max_size/","title":"nlohmann::basic_json::max_size","text":"
    size_type max_size() const noexcept;\n

    Returns the maximum number of elements a JSON value is able to hold due to system or library implementation limitations, i.e. std::distance(begin(), end()) for the JSON value.

    "},{"location":"api/basic_json/max_size/#return-value","title":"Return value","text":"

    The return value depends on the different types and is defined as follows:

    Value type return value null 0 (same as size()) boolean 1 (same as size()) string 1 (same as size()) number 1 (same as size()) binary 1 (same as size()) object result of function object_t::max_size() array result of function array_t::max_size()"},{"location":"api/basic_json/max_size/#exception-safety","title":"Exception safety","text":"

    No-throw guarantee: this function never throws exceptions.

    "},{"location":"api/basic_json/max_size/#complexity","title":"Complexity","text":"

    Constant, as long as array_t and object_t satisfy the Container concept; that is, their max_size() functions have constant complexity.

    "},{"location":"api/basic_json/max_size/#notes","title":"Notes","text":"

    This function does not return the maximal length of a string stored as JSON value -- it returns the maximal number of string elements the JSON value can store which is 1.

    "},{"location":"api/basic_json/max_size/#examples","title":"Examples","text":"Example

    The following code calls max_size() on the different value types.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // create JSON values\n    json j_null;\n    json j_boolean = true;\n    json j_number_integer = 17;\n    json j_number_float = 23.42;\n    json j_object = {{\"one\", 1}, {\"two\", 2}};\n    json j_array = {1, 2, 4, 8, 16};\n    json j_string = \"Hello, world\";\n\n    // call max_size()\n    std::cout << j_null.max_size() << '\\n';\n    std::cout << j_boolean.max_size() << '\\n';\n    std::cout << j_number_integer.max_size() << '\\n';\n    std::cout << j_number_float.max_size() << '\\n';\n    std::cout << j_object.max_size() << '\\n';\n    std::cout << j_array.max_size() << '\\n';\n    std::cout << j_string.max_size() << '\\n';\n}\n

    Output:

    0\n1\n1\n1\n115292150460684697\n576460752303423487\n1\n

    Note the output is platform-dependent.

    "},{"location":"api/basic_json/max_size/#version-history","title":"Version history","text":"
    • Added in version 1.0.0.
    • Extended to return 1 for binary types in version 3.8.0.
    "},{"location":"api/basic_json/merge_patch/","title":"nlohmann::basic_json::merge_patch","text":"
    void merge_patch(const basic_json& apply_patch);\n

    The merge patch format is primarily intended for use with the HTTP PATCH method as a means of describing a set of modifications to a target resource's content. This function applies a merge patch to the current JSON value.

    The function implements the following algorithm from Section 2 of RFC 7396 (JSON Merge Patch):

    define MergePatch(Target, Patch):\n  if Patch is an Object:\n    if Target is not an Object:\n      Target = {} // Ignore the contents and set it to an empty Object\n    for each Name/Value pair in Patch:\n      if Value is null:\n        if Name exists in Target:\n          remove the Name/Value pair from Target\n      else:\n        Target[Name] = MergePatch(Target[Name], Value)\n    return Target\n  else:\n    return Patch\n

    Thereby, Target is the current object; that is, the patch is applied to the current value.

    "},{"location":"api/basic_json/merge_patch/#parameters","title":"Parameters","text":"apply_patch (in) the patch to apply"},{"location":"api/basic_json/merge_patch/#complexity","title":"Complexity","text":"

    Linear in the lengths of apply_patch.

    "},{"location":"api/basic_json/merge_patch/#examples","title":"Examples","text":"Example

    The following code shows how a JSON Merge Patch is applied to a JSON document.

    #include <iostream>\n#include <nlohmann/json.hpp>\n#include <iomanip> // for std::setw\n\nusing json = nlohmann::json;\nusing namespace nlohmann::literals;\n\nint main()\n{\n    // the original document\n    json document = R\"({\n                \"title\": \"Goodbye!\",\n                \"author\": {\n                    \"givenName\": \"John\",\n                    \"familyName\": \"Doe\"\n                },\n                \"tags\": [\n                    \"example\",\n                    \"sample\"\n                ],\n                \"content\": \"This will be unchanged\"\n            })\"_json;\n\n    // the patch\n    json patch = R\"({\n                \"title\": \"Hello!\",\n                \"phoneNumber\": \"+01-123-456-7890\",\n                \"author\": {\n                    \"familyName\": null\n                },\n                \"tags\": [\n                    \"example\"\n                ]\n            })\"_json;\n\n    // apply the patch\n    document.merge_patch(patch);\n\n    // output original and patched document\n    std::cout << std::setw(4) << document << std::endl;\n}\n

    Output:

    {\n    \"author\": {\n        \"givenName\": \"John\"\n    },\n    \"content\": \"This will be unchanged\",\n    \"phoneNumber\": \"+01-123-456-7890\",\n    \"tags\": [\n        \"example\"\n    ],\n    \"title\": \"Hello!\"\n}\n
    "},{"location":"api/basic_json/merge_patch/#see-also","title":"See also","text":"
    • RFC 7396 (JSON Merge Patch)
    • patch apply a JSON patch
    "},{"location":"api/basic_json/merge_patch/#version-history","title":"Version history","text":"
    • Added in version 3.0.0.
    "},{"location":"api/basic_json/meta/","title":"nlohmann::basic_json::meta","text":"
    static basic_json meta();\n

    This function returns a JSON object with information about the library, including the version number and information on the platform and compiler.

    "},{"location":"api/basic_json/meta/#return-value","title":"Return value","text":"

    JSON object holding version information

    key description compiler Information on the used compiler. It is an object with the following keys: c++ (the used C++ standard), family (the compiler family; possible values are clang, icc, gcc, ilecpp, msvc, pgcpp, sunpro, and unknown), and version (the compiler version). copyright The copyright line for the library as string. name The name of the library as string. platform The used platform as string. Possible values are win32, linux, apple, unix, and unknown. url The URL of the project as string. version The version of the library. It is an object with the following keys: major, minor, and patch as defined by Semantic Versioning, and string (the version string)."},{"location":"api/basic_json/meta/#exception-safety","title":"Exception safety","text":"

    Strong guarantee: if an exception is thrown, there are no changes to any JSON value.

    "},{"location":"api/basic_json/meta/#complexity","title":"Complexity","text":"

    Constant.

    "},{"location":"api/basic_json/meta/#examples","title":"Examples","text":"Example

    The following code shows an example output of the meta() function.

    #include <iostream>\n#include <iomanip>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // call meta()\n    std::cout << std::setw(4) << json::meta() << '\\n';\n}\n

    Output:

    {\n    \"compiler\": {\n        \"c++\": \"201103\",\n        \"family\": \"gcc\",\n        \"version\": \"12.4.0\"\n    },\n    \"copyright\": \"(C) 2013-2025 Niels Lohmann\",\n    \"name\": \"JSON for Modern C++\",\n    \"platform\": \"apple\",\n    \"url\": \"https://github.com/nlohmann/json\",\n    \"version\": {\n        \"major\": 3,\n        \"minor\": 12,\n        \"patch\": 0,\n        \"string\": \"3.12.0\"\n    }\n}\n

    Note the output is platform-dependent.

    "},{"location":"api/basic_json/meta/#see-also","title":"See also","text":"
    • NLOHMANN_JSON_VERSION_MAJOR/NLOHMANN_JSON_VERSION_MINOR/NLOHMANN_JSON_VERSION_PATCH - library version information
    "},{"location":"api/basic_json/meta/#version-history","title":"Version history","text":"
    • Added in version 2.1.0.
    "},{"location":"api/basic_json/number_float_t/","title":"nlohmann::basic_json::number_float_t","text":"
    using number_float_t = NumberFloatType;\n

    The type used to store JSON numbers (floating-point).

    RFC 8259 describes numbers as follows:

    The representation of numbers is similar to that used in most programming languages. A number is represented in base 10 using decimal digits. It contains an integer component that may be prefixed with an optional minus sign, which may be followed by a fraction part and/or an exponent part. Leading zeros are not allowed. (...) Numeric values that cannot be represented in the grammar below (such as Infinity and NaN) are not permitted.

    This description includes both integer and floating-point numbers. However, C++ allows more precise storage if it is known whether the number is a signed integer, an unsigned integer, or a floating-point number. Therefore, three different types, number_integer_t, number_unsigned_t and number_float_t are used.

    To store floating-point numbers in C++, a type is defined by the template parameter NumberFloatType which chooses the type to use.

    "},{"location":"api/basic_json/number_float_t/#notes","title":"Notes","text":""},{"location":"api/basic_json/number_float_t/#default-type","title":"Default type","text":"

    With the default values for NumberFloatType (double), the default value for number_float_t is double.

    "},{"location":"api/basic_json/number_float_t/#default-behavior","title":"Default behavior","text":"
    • The restrictions about leading zeros are not enforced in C++. Instead, leading zeros in floating-point literals will be ignored. Internally, the value will be stored as a decimal number. For instance, the C++ floating-point literal 01.2 will be serialized to 1.2. During deserialization, leading zeros yield an error.
    • Not-a-number (NaN) values will be serialized to null.
    "},{"location":"api/basic_json/number_float_t/#limits","title":"Limits","text":"

    RFC 8259 states:

    This specification allows implementations to set limits on the range and precision of numbers accepted. Since software that implements IEEE 754-2008 binary64 (double precision) numbers is generally available and widely used, good interoperability can be achieved by implementations that expect no more precision or range than these provide, in the sense that implementations will approximate JSON numbers within the expected precision.

    This implementation does exactly follow this approach, as it uses double precision floating-point numbers. Note values smaller than -1.79769313486232e+308 and values greater than 1.79769313486232e+308 will be stored as NaN internally and be serialized to null.

    "},{"location":"api/basic_json/number_float_t/#storage","title":"Storage","text":"

    Floating-point number values are stored directly inside a basic_json type.

    "},{"location":"api/basic_json/number_float_t/#examples","title":"Examples","text":"Example

    The following code shows that number_float_t is by default, a typedef to double.

    #include <iostream>\n#include <iomanip>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    std::cout << std::boolalpha << std::is_same<double, json::number_float_t>::value << std::endl;\n}\n

    Output:

    true\n
    "},{"location":"api/basic_json/number_float_t/#version-history","title":"Version history","text":"
    • Added in version 1.0.0.
    "},{"location":"api/basic_json/number_integer_t/","title":"nlohmann::basic_json::number_integer_t","text":"
    using number_integer_t = NumberIntegerType;\n

    The type used to store JSON numbers (integers).

    RFC 8259 describes numbers as follows:

    The representation of numbers is similar to that used in most programming languages. A number is represented in base 10 using decimal digits. It contains an integer component that may be prefixed with an optional minus sign, which may be followed by a fraction part and/or an exponent part. Leading zeros are not allowed. (...) Numeric values that cannot be represented in the grammar below (such as Infinity and NaN) are not permitted.

    This description includes both integer and floating-point numbers. However, C++ allows more precise storage if it is known whether the number is a signed integer, an unsigned integer, or a floating-point number. Therefore, three different types, number_integer_t, number_unsigned_t and number_float_t are used.

    To store integer numbers in C++, a type is defined by the template parameter NumberIntegerType which chooses the type to use.

    "},{"location":"api/basic_json/number_integer_t/#notes","title":"Notes","text":""},{"location":"api/basic_json/number_integer_t/#default-type","title":"Default type","text":"

    With the default values for NumberIntegerType (std::int64_t), the default value for number_integer_t is std::int64_t.

    "},{"location":"api/basic_json/number_integer_t/#default-behavior","title":"Default behavior","text":"
    • The restrictions about leading zeros are not enforced in C++. Instead, leading zeros in integer literals lead to an interpretation as an octal number. Internally, the value will be stored as a decimal number. For instance, the C++ integer literal 010 will be serialized to 8. During deserialization, leading zeros yield an error.
    • Not-a-number (NaN) values will be serialized to null.
    "},{"location":"api/basic_json/number_integer_t/#limits","title":"Limits","text":"

    RFC 8259 specifies:

    An implementation may set limits on the range and precision of numbers.

    When the default type is used, the maximal integer number that can be stored is 9223372036854775807 (INT64_MAX) and the minimal integer number that can be stored is -9223372036854775808 (INT64_MIN). Integer numbers that are out of range will yield over/underflow when used in a constructor. During deserialization, too large or small integer numbers will automatically be stored as number_unsigned_t or number_float_t.

    RFC 8259 further states:

    Note that when such software is used, numbers that are integers and are in the range [-2^{53}+1, 2^{53}-1] are interoperable in the sense that implementations will agree exactly on their numeric values.

    As this range is a subrange of the exactly supported range [INT64_MIN, INT64_MAX], this class's integer type is interoperable.

    "},{"location":"api/basic_json/number_integer_t/#storage","title":"Storage","text":"

    Integer number values are stored directly inside a basic_json type.

    "},{"location":"api/basic_json/number_integer_t/#examples","title":"Examples","text":"Example

    The following code shows that number_integer_t is by default, a typedef to std::int64_t.

    #include <iostream>\n#include <iomanip>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    std::cout << std::boolalpha << std::is_same<std::int64_t, json::number_integer_t>::value << std::endl;\n}\n

    Output:

    true\n
    "},{"location":"api/basic_json/number_integer_t/#version-history","title":"Version history","text":"
    • Added in version 1.0.0.
    "},{"location":"api/basic_json/number_unsigned_t/","title":"nlohmann::basic_json::number_unsigned_t","text":"
    using number_unsigned_t = NumberUnsignedType;\n

    The type used to store JSON numbers (unsigned).

    RFC 8259 describes numbers as follows:

    The representation of numbers is similar to that used in most programming languages. A number is represented in base 10 using decimal digits. It contains an integer component that may be prefixed with an optional minus sign, which may be followed by a fraction part and/or an exponent part. Leading zeros are not allowed. (...) Numeric values that cannot be represented in the grammar below (such as Infinity and NaN) are not permitted.

    This description includes both integer and floating-point numbers. However, C++ allows more precise storage if it is known whether the number is a signed integer, an unsigned integer, or a floating-point number. Therefore, three different types, number_integer_t, number_unsigned_t and number_float_t are used.

    To store unsigned integer numbers in C++, a type is defined by the template parameter NumberUnsignedType which chooses the type to use.

    "},{"location":"api/basic_json/number_unsigned_t/#notes","title":"Notes","text":""},{"location":"api/basic_json/number_unsigned_t/#default-type","title":"Default type","text":"

    With the default values for NumberUnsignedType (std::uint64_t), the default value for number_unsigned_t is std::uint64_t.

    "},{"location":"api/basic_json/number_unsigned_t/#default-behavior","title":"Default behavior","text":"
    • The restrictions about leading zeros are not enforced in C++. Instead, leading zeros in integer literals lead to an interpretation as an octal number. Internally, the value will be stored as a decimal number. For instance, the C++ integer literal 010 will be serialized to 8. During deserialization, leading zeros yield an error.
    • Not-a-number (NaN) values will be serialized to null.
    "},{"location":"api/basic_json/number_unsigned_t/#limits","title":"Limits","text":"

    RFC 8259 specifies:

    An implementation may set limits on the range and precision of numbers.

    When the default type is used, the maximal integer number that can be stored is 18446744073709551615 (UINT64_MAX) and the minimal integer number that can be stored is 0. Integer numbers that are out of range will yield over/underflow when used in a constructor. During deserialization, too large or small integer numbers will automatically be stored as number_integer_t or number_float_t.

    RFC 8259 further states:

    Note that when such software is used, numbers that are integers and are in the range \\f[-2^{53}+1, 2^{53}-1]\\f are interoperable in the sense that implementations will agree exactly on their numeric values.

    As this range is a subrange (when considered in conjunction with the number_integer_t type) of the exactly supported range [0, UINT64_MAX], this class's integer type is interoperable.

    "},{"location":"api/basic_json/number_unsigned_t/#storage","title":"Storage","text":"

    Integer number values are stored directly inside a basic_json type.

    "},{"location":"api/basic_json/number_unsigned_t/#examples","title":"Examples","text":"Example

    The following code shows that number_unsigned_t is by default, a typedef to std::uint64_t.

    #include <iostream>\n#include <iomanip>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    std::cout << std::boolalpha << std::is_same<std::uint64_t, json::number_unsigned_t>::value << std::endl;\n}\n

    Output:

    true\n
    "},{"location":"api/basic_json/number_unsigned_t/#version-history","title":"Version history","text":"
    • Added in version 2.0.0.
    "},{"location":"api/basic_json/object/","title":"nlohmann::basic_json::object","text":"
    static basic_json object(initializer_list_t init = {});\n

    Creates a JSON object value from a given initializer list. The initializer lists elements must be pairs, and their first elements must be strings. If the initializer list is empty, the empty object {} is created.

    "},{"location":"api/basic_json/object/#parameters","title":"Parameters","text":"init (in) initializer list with JSON values to create an object from (optional)"},{"location":"api/basic_json/object/#return-value","title":"Return value","text":"

    JSON object value

    "},{"location":"api/basic_json/object/#exception-safety","title":"Exception safety","text":"

    Strong guarantee: if an exception is thrown, there are no changes in the JSON value.

    "},{"location":"api/basic_json/object/#exceptions","title":"Exceptions","text":"

    Throws type_error.301 if init is not a list of pairs whose first elements are strings. In this case, no object can be created. When such a value is passed to basic_json(initializer_list_t, bool, value_t), an array would have been created from the passed initializer list init. See the example below.

    "},{"location":"api/basic_json/object/#complexity","title":"Complexity","text":"

    Linear in the size of init.

    "},{"location":"api/basic_json/object/#notes","title":"Notes","text":"

    This function is only added for symmetry reasons. In contrast to the related function array(initializer_list_t), there are no cases that can only be expressed by this function. That is, any initializer list init can also be passed to the initializer list constructor basic_json(initializer_list_t, bool, value_t).

    "},{"location":"api/basic_json/object/#examples","title":"Examples","text":"Example

    The following code shows an example for the object function.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // create JSON objects\n    json j_no_init_list = json::object();\n    json j_empty_init_list = json::object({});\n    json j_list_of_pairs = json::object({ {\"one\", 1}, {\"two\", 2} });\n\n    // serialize the JSON objects\n    std::cout << j_no_init_list << '\\n';\n    std::cout << j_empty_init_list << '\\n';\n    std::cout << j_list_of_pairs << '\\n';\n\n    // example for an exception\n    try\n    {\n        // can only create an object from a list of pairs\n        json j_invalid_object = json::object({{ \"one\", 1, 2 }});\n    }\n    catch (const json::type_error& e)\n    {\n        std::cout << e.what() << '\\n';\n    }\n}\n

    Output:

    {}\n{}\n{\"one\":1,\"two\":2}\n[json.exception.type_error.301] cannot create object from initializer list\n
    "},{"location":"api/basic_json/object/#see-also","title":"See also","text":"
    • basic_json(initializer_list_t) - create a JSON value from an initializer list
    • array - create a JSON array value from an initializer list
    "},{"location":"api/basic_json/object/#version-history","title":"Version history","text":"
    • Added in version 1.0.0.
    "},{"location":"api/basic_json/object_comparator_t/","title":"nlohmann::basic_json::object_comparator_t","text":"
    using object_comparator_t = typename object_t::key_compare;\n// or\nusing object_comparator_t = default_object_comparator_t;\n

    The comparator used by object_t. Defined as typename object_t::key_compare if available, and default_object_comparator_t otherwise.

    "},{"location":"api/basic_json/object_comparator_t/#examples","title":"Examples","text":"Example

    The example below demonstrates the used object comparator.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    std::cout << std::boolalpha\n              << \"json::object_comparator_t(\\\"one\\\", \\\"two\\\") = \" << json::object_comparator_t{}(\"one\", \"two\") << \"\\n\"\n              << \"json::object_comparator_t(\\\"three\\\", \\\"four\\\") = \" << json::object_comparator_t{}(\"three\", \"four\") << std::endl;\n}\n

    Output:

    json::object_comparator_t(\"one\", \"two\") = true\njson::object_comparator_t(\"three\", \"four\") = false\n
    "},{"location":"api/basic_json/object_comparator_t/#version-history","title":"Version history","text":"
    • Added in version 3.0.0.
    • Changed to be conditionally defined as typename object_t::key_compare or default_object_comparator_t in version 3.11.0.
    "},{"location":"api/basic_json/object_t/","title":"nlohmann::basic_json::object_t","text":"
    using object_t = ObjectType<StringType,\n                            basic_json,\n                            default_object_comparator_t,\n                            AllocatorType<std::pair<const StringType, basic_json>>>;\n

    The type used to store JSON objects.

    RFC 8259 describes JSON objects as follows:

    An object is an unordered collection of zero or more name/value pairs, where a name is a string and a value is a string, number, boolean, null, object, or array.

    To store objects in C++, a type is defined by the template parameters described below.

    "},{"location":"api/basic_json/object_t/#template-parameters","title":"Template parameters","text":"ObjectType the container to store objects (e.g., std::map or std::unordered_map) StringType the type of the keys or names (e.g., std::string). The comparison function std::less<StringType> is used to order elements inside the container. AllocatorType the allocator to use for objects (e.g., std::allocator)"},{"location":"api/basic_json/object_t/#notes","title":"Notes","text":""},{"location":"api/basic_json/object_t/#default-type","title":"Default type","text":"

    With the default values for ObjectType (std::map), StringType (std::string), and AllocatorType (std::allocator), the default value for object_t is:

    // until C++14\nstd::map<\n  std::string, // key_type\n  basic_json, // value_type\n  std::less<std::string>, // key_compare\n  std::allocator<std::pair<const std::string, basic_json>> // allocator_type\n>\n\n// since C++14\nstd::map<\n  std::string, // key_type\n  basic_json, // value_type\n  std::less<>, // key_compare\n  std::allocator<std::pair<const std::string, basic_json>> // allocator_type\n>\n

    See default_object_comparator_t for more information.

    "},{"location":"api/basic_json/object_t/#behavior","title":"Behavior","text":"

    The choice of object_t influences the behavior of the JSON class. With the default type, objects have the following behavior:

    • When all names are unique, objects will be interoperable in the sense that all software implementations receiving that object will agree on the name-value mappings.
    • When the names within an object are not unique, it is unspecified which one of the values for a given key will be chosen. For instance, {\"key\": 2, \"key\": 1} could be equal to either {\"key\": 1} or {\"key\": 2}.
    • Internally, name/value pairs are stored in lexicographical order of the names. Objects will also be serialized (see dump) in this order. For instance, {\"b\": 1, \"a\": 2} and {\"a\": 2, \"b\": 1} will be stored and serialized as {\"a\": 2, \"b\": 1}.
    • When comparing objects, the order of the name/value pairs is irrelevant. This makes objects interoperable in the sense that they will not be affected by these differences. For instance, {\"b\": 1, \"a\": 2} and {\"a\": 2, \"b\": 1} will be treated as equal.
    "},{"location":"api/basic_json/object_t/#limits","title":"Limits","text":"

    RFC 8259 specifies:

    An implementation may set limits on the maximum depth of nesting.

    In this class, the object's limit of nesting is not explicitly constrained. However, a maximum depth of nesting may be introduced by the compiler or runtime environment. A theoretical limit can be queried by calling the max_size function of a JSON object.

    "},{"location":"api/basic_json/object_t/#storage","title":"Storage","text":"

    Objects are stored as pointers in a basic_json type. That is, for any access to object values, a pointer of type object_t* must be dereferenced.

    "},{"location":"api/basic_json/object_t/#object-key-order","title":"Object key order","text":"

    The order name/value pairs are added to the object are not preserved by the library. Therefore, iterating an object may return name/value pairs in a different order than they were originally stored. In fact, keys will be traversed in alphabetical order as std::map with std::less is used by default. Please note this behavior conforms to RFC 8259, because any order implements the specified \"unordered\" nature of JSON objects.

    "},{"location":"api/basic_json/object_t/#examples","title":"Examples","text":"Example

    The following code shows that object_t is by default, a typedef to std::map<json::string_t, json>.

    #include <iostream>\n#include <iomanip>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    std::cout << std::boolalpha << std::is_same<std::map<json::string_t, json>, json::object_t>::value << std::endl;\n}\n

    Output:

    true\n
    "},{"location":"api/basic_json/object_t/#version-history","title":"Version history","text":"
    • Added in version 1.0.0.
    "},{"location":"api/basic_json/operator%2B%3D/","title":"nlohmann::basic_json::operator+=","text":"
    // (1)\nreference operator+=(basic_json&& val);\nreference operator+=(const basic_json& val);\n\n// (2)\nreference operator+=(const typename object_t::value_type& val);\n\n// (3)\nreference operator+=(initializer_list_t init);\n

    1. Appends the given element val to the end of the JSON array. If the function is called on a JSON null value, an empty array is created before appending val.

    2. Inserts the given element val to the JSON object. If the function is called on a JSON null value, an empty object is created before inserting val.

    3. This function allows using operator+= with an initializer list. In case

      1. the current value is an object,
      2. the initializer list init contains only two elements, and
      3. the first element of init is a string,

      init is converted into an object element and added using operator+=(const typename object_t::value_type&). Otherwise, init is converted to a JSON value and added using operator+=(basic_json&&).

    "},{"location":"api/basic_json/operator%2B%3D/#iterator-invalidation","title":"Iterator invalidation","text":"

    For all cases where an element is added to an array, a reallocation can happen, in which case all iterators (including the end() iterator) and all references to the elements are invalidated. Otherwise, only the end() iterator is invalidated.

    For ordered_json, also adding an element to an object can yield a reallocation which again invalidates all iterators and all references.

    "},{"location":"api/basic_json/operator%2B%3D/#parameters","title":"Parameters","text":"val (in) the value to add to the JSON array/object init (in) an initializer list"},{"location":"api/basic_json/operator%2B%3D/#return-value","title":"Return value","text":"

    *this

    "},{"location":"api/basic_json/operator%2B%3D/#exceptions","title":"Exceptions","text":"

    All functions can throw the following exception: - Throws type_error.308 when called on a type other than JSON array or null; example: \"cannot use operator+=() with number\"

    "},{"location":"api/basic_json/operator%2B%3D/#complexity","title":"Complexity","text":"
    1. Amortized constant.
    2. Logarithmic in the size of the container, O(log(size())).
    3. Linear in the size of the initializer list init.
    "},{"location":"api/basic_json/operator%2B%3D/#notes","title":"Notes","text":"

    (3) This function is required to resolve an ambiguous overload error, because pairs like {\"key\", \"value\"} can be both interpreted as object_t::value_type or std::initializer_list<basic_json>, see #235 for more information.

    "},{"location":"api/basic_json/operator%2B%3D/#examples","title":"Examples","text":"Example: (1) add element to array

    The example shows how push_back() and += can be used to add elements to a JSON array. Note how the null value was silently converted to a JSON array.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // create JSON values\n    json array = {1, 2, 3, 4, 5};\n    json null;\n\n    // print values\n    std::cout << array << '\\n';\n    std::cout << null << '\\n';\n\n    // add values\n    array.push_back(6);\n    array += 7;\n    null += \"first\";\n    null += \"second\";\n\n    // print values\n    std::cout << array << '\\n';\n    std::cout << null << '\\n';\n}\n

    Output:

    [1,2,3,4,5]\nnull\n[1,2,3,4,5,6,7]\n[\"first\",\"second\"]\n
    Example: (2) add element to object

    The example shows how push_back() and += can be used to add elements to a JSON object. Note how the null value was silently converted to a JSON object.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // create JSON values\n    json object = {{\"one\", 1}, {\"two\", 2}};\n    json null;\n\n    // print values\n    std::cout << object << '\\n';\n    std::cout << null << '\\n';\n\n    // add values\n    object.push_back(json::object_t::value_type(\"three\", 3));\n    object += json::object_t::value_type(\"four\", 4);\n    null += json::object_t::value_type(\"A\", \"a\");\n    null += json::object_t::value_type(\"B\", \"b\");\n\n    // print values\n    std::cout << object << '\\n';\n    std::cout << null << '\\n';\n}\n

    Output:

    {\"one\":1,\"two\":2}\nnull\n{\"four\":4,\"one\":1,\"three\":3,\"two\":2}\n{\"A\":\"a\",\"B\":\"b\"}\n
    Example: (3) add to object from initializer list

    The example shows how initializer lists are treated as objects when possible.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // create JSON values\n    json object = {{\"one\", 1}, {\"two\", 2}};\n    json null;\n\n    // print values\n    std::cout << object << '\\n';\n    std::cout << null << '\\n';\n\n    // add values:\n    object.push_back({\"three\", 3});  // object is extended\n    object += {\"four\", 4};           // object is extended\n    null.push_back({\"five\", 5});     // null is converted to array\n\n    // print values\n    std::cout << object << '\\n';\n    std::cout << null << '\\n';\n\n    // would throw:\n    //object.push_back({1, 2, 3});\n}\n

    Output:

    {\"one\":1,\"two\":2}\nnull\n{\"four\":4,\"one\":1,\"three\":3,\"two\":2}\n[[\"five\",5]]\n
    "},{"location":"api/basic_json/operator%2B%3D/#see-also","title":"See also","text":"
    • emplace_back add a value to an array
    • push_back add a value to an array/object
    "},{"location":"api/basic_json/operator%2B%3D/#version-history","title":"Version history","text":"
    1. Since version 1.0.0.
    2. Since version 1.0.0.
    3. Since version 2.0.0.
    "},{"location":"api/basic_json/operator%3D/","title":"nlohmann::basic_json::operator=","text":"
    basic_json& operator=(basic_json other) noexcept (\n    std::is_nothrow_move_constructible<value_t>::value &&\n    std::is_nothrow_move_assignable<value_t>::value &&\n    std::is_nothrow_move_constructible<json_value>::value &&\n    std::is_nothrow_move_assignable<json_value>::value\n);\n

    Copy assignment operator. Copies a JSON value via the \"copy and swap\" strategy: It is expressed in terms of the copy constructor, destructor, and the swap() member function.

    "},{"location":"api/basic_json/operator%3D/#parameters","title":"Parameters","text":"other (in) value to copy from"},{"location":"api/basic_json/operator%3D/#complexity","title":"Complexity","text":"

    Linear.

    "},{"location":"api/basic_json/operator%3D/#examples","title":"Examples","text":"Example

    The code below shows and example for the copy assignment. It creates a copy of value a which is then swapped with b. Finally, the copy of a (which is the null value after the swap) is destroyed.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // create JSON values\n    json a = 23;\n    json b = 42;\n\n    // copy-assign a to b\n    b = a;\n\n    // serialize the JSON arrays\n    std::cout << a << '\\n';\n    std::cout << b << '\\n';\n}\n

    Output:

    23\n23\n
    "},{"location":"api/basic_json/operator%3D/#version-history","title":"Version history","text":"
    • Added in version 1.0.0.
    "},{"location":"api/basic_json/operator%5B%5D/","title":"nlohmann::basic_json::operator[]","text":"
    // (1)\nreference operator[](size_type idx);\nconst_reference operator[](size_type idx) const;\n\n// (2)\nreference operator[](typename object_t::key_type key);\nconst_reference operator[](const typename object_t::key_type& key) const;\n\n// (3)\ntemplate<typename KeyType>\nreference operator[](KeyType&& key);\ntemplate<typename KeyType>\nconst_reference operator[](KeyType&& key) const;\n\n// (4)\nreference operator[](const json_pointer& ptr);\nconst_reference operator[](const json_pointer& ptr) const;\n
    1. Returns a reference to the array element at specified location idx.
    2. Returns a reference to the object element with specified key key. The non-const qualified overload takes the key by value.
    3. See 2. This overload is only available if KeyType is comparable with typename object_t::key_type and typename object_comparator_t::is_transparent denotes a type.
    4. Returns a reference to the element with specified JSON pointer ptr.
    "},{"location":"api/basic_json/operator%5B%5D/#template-parameters","title":"Template parameters","text":"KeyType A type for an object key other than json_pointer that is comparable with string_t using object_comparator_t. This can also be a string view (C++17)."},{"location":"api/basic_json/operator%5B%5D/#iterator-invalidation","title":"Iterator invalidation","text":"

    For the non-const versions 1. and 4., when passing an array index that does not exist, it is created and filled with a null value before a reference to it is returned. For this, a reallocation can happen, in which case all iterators (including the end() iterator) and all references to the elements are invalidated.

    For ordered_json, also passing an object key to the non-const versions 2., 3., and 4., a reallocation can happen which again invalidates all iterators and all references.

    "},{"location":"api/basic_json/operator%5B%5D/#parameters","title":"Parameters","text":"idx (in) index of the element to access key (in) object key of the element to access ptr (in) JSON pointer to the desired element"},{"location":"api/basic_json/operator%5B%5D/#return-value","title":"Return value","text":"
    1. (const) reference to the element at index idx
    2. (const) reference to the element at key key
    3. (const) reference to the element at key key
    4. (const) reference to the element pointed to by ptr
    "},{"location":"api/basic_json/operator%5B%5D/#exception-safety","title":"Exception safety","text":"

    Strong exception safety: if an exception occurs, the original value stays intact.

    "},{"location":"api/basic_json/operator%5B%5D/#exceptions","title":"Exceptions","text":"
    1. The function can throw the following exceptions:
      • Throws type_error.305 if the JSON value is not an array or null; in that case, using the [] operator with an index makes no sense.
    2. The function can throw the following exceptions:
      • Throws type_error.305 if the JSON value is not an object or null; in that case, using the [] operator with a key makes no sense.
    3. See 2.
    4. The function can throw the following exceptions:
      • Throws parse_error.106 if an array index in the passed JSON pointer ptr begins with '0'.
      • Throws parse_error.109 if an array index in the passed JSON pointer ptr is not a number.
      • Throws out_of_range.402 if the array index '-' is used in the passed JSON pointer ptr for the const version.
      • Throws out_of_range.404 if the JSON pointer ptr can not be resolved.
    "},{"location":"api/basic_json/operator%5B%5D/#complexity","title":"Complexity","text":"
    1. Constant if idx is in the range of the array. Otherwise, linear in idx - size().
    2. Logarithmic in the size of the container.
    3. Logarithmic in the size of the container.
    4. Logarithmic in the size of the container.
    "},{"location":"api/basic_json/operator%5B%5D/#notes","title":"Notes","text":"

    Undefined behavior and runtime assertions

    1. If the element with key idx does not exist, the behavior is undefined.
    2. If the element with key key does not exist, the behavior is undefined and is guarded by a runtime assertion!

    1. The non-const version may add values: If idx is beyond the range of the array (i.e., idx >= size()), then the array is silently filled up with null values to make idx a valid reference to the last stored element. In case the value was null before, it is converted to an array.

    2. If key is not found in the object, then it is silently added to the object and filled with a null value to make key a valid reference. In case the value was null before, it is converted to an object.

    3. See 2.

    4. null values are created in arrays and objects if necessary.

      In particular:

      • If the JSON pointer points to an object key that does not exist, it is created and filled with a null value before a reference to it is returned.
      • If the JSON pointer points to an array index that does not exist, it is created and filled with a null value before a reference to it is returned. All indices between the current maximum and the given index are also filled with null.
      • The special value - is treated as a synonym for the index past the end.
    "},{"location":"api/basic_json/operator%5B%5D/#examples","title":"Examples","text":"Example: (1) access specified array element

    The example below shows how array elements can be read and written using [] operator. Note the addition of null values.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // create a JSON array\n    json array = {1, 2, 3, 4, 5};\n\n    // output element at index 3 (fourth element)\n    std::cout << array[3] << '\\n';\n\n    // change last element to 6\n    array[array.size() - 1] = 6;\n\n    // output changed array\n    std::cout << array << '\\n';\n\n    // write beyond array limit\n    array[10] = 11;\n\n    // output changed array\n    std::cout << array << '\\n';\n}\n

    Output:

    4\n[1,2,3,4,6]\n[1,2,3,4,6,null,null,null,null,null,11]\n
    Example: (1) access specified array element (const)

    The example below shows how array elements can be read using the [] operator.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // create JSON array\n    const json array = {\"first\", \"2nd\", \"third\", \"fourth\"};\n\n    // output element at index 2 (third element)\n    std::cout << array.at(2) << '\\n';\n}\n

    Output:

    \"third\"\n
    Example: (2) access specified object element

    The example below shows how object elements can be read and written using the [] operator.

    #include <iostream>\n#include <iomanip>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // create a JSON object\n    json object =\n    {\n        {\"one\", 1}, {\"two\", 2}, {\"three\", 2.9}\n    };\n\n    // output element with key \"two\"\n    std::cout << object[\"two\"] << \"\\n\\n\";\n\n    // change element with key \"three\"\n    object[\"three\"] = 3;\n\n    // output changed array\n    std::cout << std::setw(4) << object << \"\\n\\n\";\n\n    // mention nonexisting key\n    object[\"four\"];\n\n    // write to nonexisting key\n    object[\"five\"][\"really\"][\"nested\"] = true;\n\n    // output changed object\n    std::cout << std::setw(4) << object << '\\n';\n}\n

    Output:

    2\n\n{\n    \"one\": 1,\n    \"three\": 3,\n    \"two\": 2\n}\n\n{\n    \"five\": {\n        \"really\": {\n            \"nested\": true\n        }\n    },\n    \"four\": null,\n    \"one\": 1,\n    \"three\": 3,\n    \"two\": 2\n}\n
    Example: (2) access specified object element (const)

    The example below shows how object elements can be read using the [] operator.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // create a JSON object\n    const json object =\n    {\n        {\"one\", 1}, {\"two\", 2}, {\"three\", 2.9}\n    };\n\n    // output element with key \"two\"\n    std::cout << object[\"two\"] << '\\n';\n}\n

    Output:

    2\n
    Example: (3) access specified object element using string_view

    The example below shows how object elements can be read using the [] operator.

    #include <iostream>\n#include <iomanip>\n#include <string_view>\n#include <nlohmann/json.hpp>\n\nusing namespace std::string_view_literals;\nusing json = nlohmann::json;\n\nint main()\n{\n    // create a JSON object\n    json object =\n    {\n        {\"one\", 1}, {\"two\", 2}, {\"three\", 2.9}\n    };\n\n    // output element with key \"two\"\n    std::cout << object[\"two\"sv] << \"\\n\\n\";\n\n    // change element with key \"three\"\n    object[\"three\"sv] = 3;\n\n    // output changed array\n    std::cout << std::setw(4) << object << \"\\n\\n\";\n\n    // mention nonexisting key\n    object[\"four\"sv];\n\n    // write to nonexisting key\n    object[\"five\"sv][\"really\"sv][\"nested\"sv] = true;\n\n    // output changed object\n    std::cout << std::setw(4) << object << '\\n';\n}\n

    Output:

    2\n\n{\n    \"one\": 1,\n    \"three\": 3,\n    \"two\": 2\n}\n\n{\n    \"five\": {\n        \"really\": {\n            \"nested\": true\n        }\n    },\n    \"four\": null,\n    \"one\": 1,\n    \"three\": 3,\n    \"two\": 2\n}\n
    Example: (3) access specified object element using string_view (const)

    The example below shows how object elements can be read using the [] operator.

    #include <iostream>\n#include <string_view>\n#include <nlohmann/json.hpp>\n\nusing namespace std::string_view_literals;\nusing json = nlohmann::json;\n\nint main()\n{\n    // create a JSON object\n    const json object =\n    {\n        {\"one\", 1}, {\"two\", 2}, {\"three\", 2.9}\n    };\n\n    // output element with key \"two\"\n    std::cout << object[\"two\"sv] << '\\n';\n}\n

    Output:

    2\n
    Example: (4) access specified element via JSON Pointer

    The example below shows how values can be read and written using JSON Pointers.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\nusing namespace nlohmann::literals;\n\nint main()\n{\n    // create a JSON value\n    json j =\n    {\n        {\"number\", 1}, {\"string\", \"foo\"}, {\"array\", {1, 2}}\n    };\n\n    // read-only access\n\n    // output element with JSON pointer \"/number\"\n    std::cout << j[\"/number\"_json_pointer] << '\\n';\n    // output element with JSON pointer \"/string\"\n    std::cout << j[\"/string\"_json_pointer] << '\\n';\n    // output element with JSON pointer \"/array\"\n    std::cout << j[\"/array\"_json_pointer] << '\\n';\n    // output element with JSON pointer \"/array/1\"\n    std::cout << j[\"/array/1\"_json_pointer] << '\\n';\n\n    // writing access\n\n    // change the string\n    j[\"/string\"_json_pointer] = \"bar\";\n    // output the changed string\n    std::cout << j[\"string\"] << '\\n';\n\n    // \"change\" a nonexisting object entry\n    j[\"/boolean\"_json_pointer] = true;\n    // output the changed object\n    std::cout << j << '\\n';\n\n    // change an array element\n    j[\"/array/1\"_json_pointer] = 21;\n    // \"change\" an array element with nonexisting index\n    j[\"/array/4\"_json_pointer] = 44;\n    // output the changed array\n    std::cout << j[\"array\"] << '\\n';\n\n    // \"change\" the array element past the end\n    j[\"/array/-\"_json_pointer] = 55;\n    // output the changed array\n    std::cout << j[\"array\"] << '\\n';\n}\n

    Output:

    1\n\"foo\"\n[1,2]\n2\n\"bar\"\n{\"array\":[1,2],\"boolean\":true,\"number\":1,\"string\":\"bar\"}\n[1,21,null,null,44]\n[1,21,null,null,44,55]\n
    Example: (4) access specified element via JSON Pointer (const)

    The example below shows how values can be read using JSON Pointers.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\nusing namespace nlohmann::literals;\n\nint main()\n{\n    // create a JSON value\n    const json j =\n    {\n        {\"number\", 1}, {\"string\", \"foo\"}, {\"array\", {1, 2}}\n    };\n\n    // read-only access\n\n    // output element with JSON pointer \"/number\"\n    std::cout << j[\"/number\"_json_pointer] << '\\n';\n    // output element with JSON pointer \"/string\"\n    std::cout << j[\"/string\"_json_pointer] << '\\n';\n    // output element with JSON pointer \"/array\"\n    std::cout << j[\"/array\"_json_pointer] << '\\n';\n    // output element with JSON pointer \"/array/1\"\n    std::cout << j[\"/array/1\"_json_pointer] << '\\n';\n}\n

    Output:

    1\n\"foo\"\n[1,2]\n2\n
    "},{"location":"api/basic_json/operator%5B%5D/#see-also","title":"See also","text":"
    • documentation on unchecked access
    • documentation on runtime assertions
    • see at for access by reference with range checking
    • see value for access with default value
    "},{"location":"api/basic_json/operator%5B%5D/#version-history","title":"Version history","text":"
    1. Added in version 1.0.0.
    2. Added in version 1.0.0. Added overloads for T* key in version 1.1.0. Removed overloads for T* key (replaced by 3) in version 3.11.0.
    3. Added in version 3.11.0.
    4. Added in version 2.0.0.
    "},{"location":"api/basic_json/operator_ValueType/","title":"nlohmann::basic_json::operator ValueType","text":"
    template<typename ValueType>\nJSON_EXPLICIT operator ValueType() const;\n

    Implicit type conversion between the JSON value and a compatible value. The call is realized by calling get(). See Notes for the meaning of JSON_EXPLICIT.

    "},{"location":"api/basic_json/operator_ValueType/#template-parameters","title":"Template parameters","text":"ValueType the value type to return"},{"location":"api/basic_json/operator_ValueType/#return-value","title":"Return value","text":"

    copy of the JSON value, converted to ValueType

    "},{"location":"api/basic_json/operator_ValueType/#exceptions","title":"Exceptions","text":"

    Depends on what json_serializer<ValueType> from_json() method throws

    "},{"location":"api/basic_json/operator_ValueType/#complexity","title":"Complexity","text":"

    Linear in the size of the JSON value.

    "},{"location":"api/basic_json/operator_ValueType/#notes","title":"Notes","text":"

    Definition of JSON_EXPLICIT

    By default JSON_EXPLICIT is defined to the empty string, so the signature is:

    template<typename ValueType>\noperator ValueType() const;\n

    If JSON_USE_IMPLICIT_CONVERSIONS is set to 0, JSON_EXPLICIT is defined to explicit:

    template<typename ValueType>\nexplicit operator ValueType() const;\n

    That is, implicit conversions can be switched off by defining JSON_USE_IMPLICIT_CONVERSIONS to 0.

    Future behavior change

    Implicit conversions will be switched off by default in the next major release of the library. That is, JSON_EXPLICIT will be set to explicit by default.

    You can prepare existing code by already defining JSON_USE_IMPLICIT_CONVERSIONS to 0 and replace any implicit conversions with calls to get.

    "},{"location":"api/basic_json/operator_ValueType/#examples","title":"Examples","text":"Example

    The example below shows several conversions from JSON values to other types. There are a few things to note: (1) Floating-point numbers can be converted to integers, (2) A JSON array can be converted to a standard std::vector<short>, (3) A JSON object can be converted to C++ associative containers such as std::unordered_map<std::string, json>.

    #include <iostream>\n#include <unordered_map>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // create a JSON value with different types\n    json json_types =\n    {\n        {\"boolean\", true},\n        {\n            \"number\", {\n                {\"integer\", 42},\n                {\"floating-point\", 17.23}\n            }\n        },\n        {\"string\", \"Hello, world!\"},\n        {\"array\", {1, 2, 3, 4, 5}},\n        {\"null\", nullptr}\n    };\n\n    // use implicit conversions\n    bool v1 = json_types[\"boolean\"];\n    int v2 = json_types[\"number\"][\"integer\"];\n    short v3 = json_types[\"number\"][\"integer\"];\n    float v4 = json_types[\"number\"][\"floating-point\"];\n    int v5 = json_types[\"number\"][\"floating-point\"];\n    std::string v6 = json_types[\"string\"];\n    std::vector<short> v7 = json_types[\"array\"];\n    std::unordered_map<std::string, json> v8 = json_types;\n\n    // print the conversion results\n    std::cout << v1 << '\\n';\n    std::cout << v2 << ' ' << v3 << '\\n';\n    std::cout << v4 << ' ' << v5 << '\\n';\n    std::cout << v6 << '\\n';\n\n    for (auto i : v7)\n    {\n        std::cout << i << ' ';\n    }\n    std::cout << \"\\n\\n\";\n\n    for (auto i : v8)\n    {\n        std::cout << i.first << \": \" << i.second << '\\n';\n    }\n\n    // example for an exception\n    try\n    {\n        bool v1 = json_types[\"string\"];\n    }\n    catch (const json::type_error& e)\n    {\n        std::cout << e.what() << '\\n';\n    }\n}\n

    Output:

    1\n42 42\n17.23 17\nHello, world!\n1 2 3 4 5 \n\nstring: \"Hello, world!\"\nnumber: {\"floating-point\":17.23,\"integer\":42}\nnull: null\nboolean: true\narray: [1,2,3,4,5]\n[json.exception.type_error.302] type must be boolean, but is string\n
    "},{"location":"api/basic_json/operator_ValueType/#version-history","title":"Version history","text":"
    • Since version 1.0.0.
    • Macros JSON_EXPLICIT/JSON_USE_IMPLICIT_CONVERSIONS added in version 3.9.0.
    "},{"location":"api/basic_json/operator_eq/","title":"nlohmann::basic_json::operator==","text":"
    // until C++20\nbool operator==(const_reference lhs, const_reference rhs) noexcept;   // (1)\n\ntemplate<typename ScalarType>\nbool operator==(const_reference lhs, const ScalarType rhs) noexcept;  // (2)\n\ntemplate<typename ScalarType>\nbool operator==(ScalarType lhs, const const_reference rhs) noexcept;  // (2)\n\n// since C++20\nclass basic_json {\n    bool operator==(const_reference rhs) const noexcept;              // (1)\n\n    template<typename ScalarType>\n    bool operator==(ScalarType rhs) const noexcept;                   // (2)\n};\n

    1. Compares two JSON values for equality according to the following rules:

      • Two JSON values are equal if (1) neither value is discarded, or (2) they are of the same type and their stored values are the same according to their respective operator==.
      • Integer and floating-point numbers are automatically converted before comparison.

    2. Compares a JSON value and a scalar or a scalar and a JSON value for equality by converting the scalar to a JSON value and comparing both JSON values according to 1.

    "},{"location":"api/basic_json/operator_eq/#template-parameters","title":"Template parameters","text":"ScalarType a scalar type according to std::is_scalar<ScalarType>::value"},{"location":"api/basic_json/operator_eq/#parameters","title":"Parameters","text":"lhs (in) first value to consider rhs (in) second value to consider"},{"location":"api/basic_json/operator_eq/#return-value","title":"Return value","text":"

    whether the values lhs/*this and rhs are equal

    "},{"location":"api/basic_json/operator_eq/#exception-safety","title":"Exception safety","text":"

    No-throw guarantee: this function never throws exceptions.

    "},{"location":"api/basic_json/operator_eq/#complexity","title":"Complexity","text":"

    Linear.

    "},{"location":"api/basic_json/operator_eq/#notes","title":"Notes","text":"

    Comparing special values

    • NaN values are unordered within the domain of numbers. The following comparisons all yield false:
      1. Comparing a NaN with itself.
      2. Comparing a NaN with another NaN.
      3. Comparing a NaN and any other number.
    • JSON null values are all equal.
    • Discarded values never compare equal to themselves.

    Comparing floating-point numbers

    Floating-point numbers inside JSON values numbers are compared with json::number_float_t::operator== which is double::operator== by default. To compare floating-point while respecting an epsilon, an alternative comparison function could be used, for instance

    template<typename T, typename = typename std::enable_if<std::is_floating_point<T>::value, T>::type>\ninline bool is_same(T a, T b, T epsilon = std::numeric_limits<T>::epsilon()) noexcept\n{\n    return std::abs(a - b) <= epsilon;\n}\n

    Or you can self-defined operator equal function like this:

    bool my_equal(const_reference lhs, const_reference rhs)\n{\n    const auto lhs_type lhs.type();\n    const auto rhs_type rhs.type();\n    if (lhs_type == rhs_type)\n    {\n        switch(lhs_type)\n            // self_defined case\n            case value_t::number_float:\n                return std::abs(lhs - rhs) <= std::numeric_limits<float>::epsilon();\n            // other cases remain the same with the original\n            ...\n    }\n...\n}\n

    Comparing different basic_json specializations

    Comparing different basic_json specializations can have surprising effects. For instance, the result of comparing the JSON objects

    {\n   \"version\": 1,\n   \"type\": \"integer\"\n}\n

    and

    {\n   \"type\": \"integer\",\n   \"version\": 1\n}\n

    depends on whether nlohmann::json or nlohmann::ordered_json is used:

    #include <iostream>\n#include <iomanip>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    nlohmann::json uj1 = {{\"version\", 1}, {\"type\", \"integer\"}};\n    nlohmann::json uj2 = {{\"type\", \"integer\"}, {\"version\", 1}};\n\n    nlohmann::ordered_json oj1 = {{\"version\", 1}, {\"type\", \"integer\"}};\n    nlohmann::ordered_json oj2 = {{\"type\", \"integer\"}, {\"version\", 1}};\n\n    std::cout << std::boolalpha << (uj1 == uj2) << '\\n' << (oj1 == oj2) << std::endl;\n}\n

    Output:

    true\nfalse\n
    "},{"location":"api/basic_json/operator_eq/#examples","title":"Examples","text":"Example

    The example demonstrates comparing several JSON types.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // create several JSON values\n    json array_1 = {1, 2, 3};\n    json array_2 = {1, 2, 4};\n    json object_1 = {{\"A\", \"a\"}, {\"B\", \"b\"}};\n    json object_2 = {{\"B\", \"b\"}, {\"A\", \"a\"}};\n    json number_1 = 17;\n    json number_2 = 17.000000000000001L;\n    json string_1 = \"foo\";\n    json string_2 = \"bar\";\n\n    // output values and comparisons\n    std::cout << std::boolalpha;\n    std::cout << array_1 << \" == \" << array_2 << \" \" << (array_1 == array_2) << '\\n';\n    std::cout << object_1 << \" == \" << object_2 << \" \" << (object_1 == object_2) << '\\n';\n    std::cout << number_1 << \" == \" << number_2 << \" \" << (number_1 == number_2) << '\\n';\n    std::cout << string_1 << \" == \" << string_2 << \" \" << (string_1 == string_2) << '\\n';\n}\n

    Output:

    [1,2,3] == [1,2,4] false\n{\"A\":\"a\",\"B\":\"b\"} == {\"A\":\"a\",\"B\":\"b\"} true\n17 == 17.0 true\n\"foo\" == \"bar\" false\n
    Example

    The example demonstrates comparing several JSON types against the null pointer (JSON null).

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // create several JSON values\n    json array = {1, 2, 3};\n    json object = {{\"A\", \"a\"}, {\"B\", \"b\"}};\n    json number = 17;\n    json string = \"foo\";\n    json null;\n\n    // output values and comparisons\n    std::cout << std::boolalpha;\n    std::cout << array << \" == nullptr \" << (array == nullptr) << '\\n';\n    std::cout << object << \" == nullptr \" << (object == nullptr) << '\\n';\n    std::cout << number << \" == nullptr \" << (number == nullptr) << '\\n';\n    std::cout << string << \" == nullptr \" << (string == nullptr) << '\\n';\n    std::cout << null << \" == nullptr \" << (null == nullptr) << '\\n';\n}\n

    Output:

    [1,2,3] == nullptr false\n{\"A\":\"a\",\"B\":\"b\"} == nullptr false\n17 == nullptr false\n\"foo\" == nullptr false\nnull == nullptr true\n
    "},{"location":"api/basic_json/operator_eq/#version-history","title":"Version history","text":"
    1. Added in version 1.0.0. Added C++20 member functions in version 3.11.0.
    2. Added in version 1.0.0. Added C++20 member functions in version 3.11.0.
    "},{"location":"api/basic_json/operator_ge/","title":"nlohmann::basic_json::operator>=","text":"
    // until C++20\nbool operator>=(const_reference lhs, const_reference rhs) noexcept;   // (1)\n\ntemplate<typename ScalarType>\nbool operator>=(const_reference lhs, const ScalarType rhs) noexcept;  // (2)\n\ntemplate<typename ScalarType>\nbool operator>=(ScalarType lhs, const const_reference rhs) noexcept;  // (2)\n

    1. Compares whether one JSON value lhs is greater than or equal to another JSON value rhs according to the following rules:

      • The comparison always yields false if (1) either operand is discarded, or (2) either operand is NaN and the other operand is either NaN or any other number.
      • Otherwise, returns the result of !(lhs < rhs) (see operator<).

    2. Compares whether a JSON value is greater than or equal to a scalar or a scalar is greater than or equal to a JSON value by converting the scalar to a JSON value and comparing both JSON values according to 1.

    "},{"location":"api/basic_json/operator_ge/#template-parameters","title":"Template parameters","text":"ScalarType a scalar type according to std::is_scalar<ScalarType>::value"},{"location":"api/basic_json/operator_ge/#parameters","title":"Parameters","text":"lhs (in) first value to consider rhs (in) second value to consider"},{"location":"api/basic_json/operator_ge/#return-value","title":"Return value","text":"

    whether lhs is less than or equal to rhs

    "},{"location":"api/basic_json/operator_ge/#exception-safety","title":"Exception safety","text":"

    No-throw guarantee: this function never throws exceptions.

    "},{"location":"api/basic_json/operator_ge/#complexity","title":"Complexity","text":"

    Linear.

    "},{"location":"api/basic_json/operator_ge/#notes","title":"Notes","text":"

    Comparing NaN

    NaN values are unordered within the domain of numbers. The following comparisons all yield false: 1. Comparing a NaN with itself. 2. Comparing a NaN with another NaN. 3. Comparing a NaN and any other number.

    Operator overload resolution

    Since C++20 overload resolution will consider the rewritten candidate generated from operator<=>.

    "},{"location":"api/basic_json/operator_ge/#examples","title":"Examples","text":"Example

    The example demonstrates comparing several JSON types.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // create several JSON values\n    json array_1 = {1, 2, 3};\n    json array_2 = {1, 2, 4};\n    json object_1 = {{\"A\", \"a\"}, {\"B\", \"b\"}};\n    json object_2 = {{\"B\", \"b\"}, {\"A\", \"a\"}};\n    json number_1 = 17;\n    json number_2 = 17.0000000000001L;\n    json string_1 = \"foo\";\n    json string_2 = \"bar\";\n\n    // output values and comparisons\n    std::cout << std::boolalpha;\n    std::cout << array_1 << \" >= \" << array_2 << \" \" << (array_1 >= array_2) << '\\n';\n    std::cout << object_1 << \" >= \" << object_2 << \" \" << (object_1 >= object_2) << '\\n';\n    std::cout << number_1 << \" >= \" << number_2 << \" \" << (number_1 >= number_2) << '\\n';\n    std::cout << string_1 << \" >= \" << string_2 << \" \" << (string_1 >= string_2) << '\\n';\n}\n

    Output:

    [1,2,3] >= [1,2,4] false\n{\"A\":\"a\",\"B\":\"b\"} >= {\"A\":\"a\",\"B\":\"b\"} true\n17 >= 17.0000000000001 false\n\"foo\" >= \"bar\" true\n
    "},{"location":"api/basic_json/operator_ge/#see-also","title":"See also","text":"
    • operator<=> comparison: 3-way
    "},{"location":"api/basic_json/operator_ge/#version-history","title":"Version history","text":"
    1. Added in version 1.0.0. Conditionally removed since C++20 in version 3.11.0.
    2. Added in version 1.0.0. Conditionally removed since C++20 in version 3.11.0.
    "},{"location":"api/basic_json/operator_gt/","title":"nlohmann::basic_json::operator>","text":"
    // until C++20\nbool operator>(const_reference lhs, const_reference rhs) noexcept;   // (1)\n\ntemplate<typename ScalarType>\nbool operator>(const_reference lhs, const ScalarType rhs) noexcept;  // (2)\n\ntemplate<typename ScalarType>\nbool operator>(ScalarType lhs, const const_reference rhs) noexcept;  // (2)\n

    1. Compares whether one JSON value lhs is greater than another JSON value rhs according to the following rules:

      • The comparison always yields false if (1) either operand is discarded, or (2) either operand is NaN and the other operand is either NaN or any other number.
      • Otherwise, returns the result of !(lhs <= rhs) (see operator<=).

    2. Compares whether a JSON value is greater than a scalar or a scalar is greater than a JSON value by converting the scalar to a JSON value and comparing both JSON values according to 1.

    "},{"location":"api/basic_json/operator_gt/#template-parameters","title":"Template parameters","text":"ScalarType a scalar type according to std::is_scalar<ScalarType>::value"},{"location":"api/basic_json/operator_gt/#parameters","title":"Parameters","text":"lhs (in) first value to consider rhs (in) second value to consider"},{"location":"api/basic_json/operator_gt/#return-value","title":"Return value","text":"

    whether lhs is greater than rhs

    "},{"location":"api/basic_json/operator_gt/#exception-safety","title":"Exception safety","text":"

    No-throw guarantee: this function never throws exceptions.

    "},{"location":"api/basic_json/operator_gt/#complexity","title":"Complexity","text":"

    Linear.

    "},{"location":"api/basic_json/operator_gt/#notes","title":"Notes","text":"

    Comparing NaN

    NaN values are unordered within the domain of numbers. The following comparisons all yield false: 1. Comparing a NaN with itself. 2. Comparing a NaN with another NaN. 3. Comparing a NaN and any other number.

    Operator overload resolution

    Since C++20 overload resolution will consider the rewritten candidate generated from operator<=>.

    "},{"location":"api/basic_json/operator_gt/#examples","title":"Examples","text":"Example

    The example demonstrates comparing several JSON types.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // create several JSON values\n    json array_1 = {1, 2, 3};\n    json array_2 = {1, 2, 4};\n    json object_1 = {{\"A\", \"a\"}, {\"B\", \"b\"}};\n    json object_2 = {{\"B\", \"b\"}, {\"A\", \"a\"}};\n    json number_1 = 17;\n    json number_2 = 17.0000000000001L;\n    json string_1 = \"foo\";\n    json string_2 = \"bar\";\n\n    // output values and comparisons\n    std::cout << std::boolalpha;\n    std::cout << array_1 << \" > \" << array_2 << \" \" << (array_1 > array_2) << '\\n';\n    std::cout << object_1 << \" > \" << object_2 << \" \" << (object_1 > object_2) << '\\n';\n    std::cout << number_1 << \" > \" << number_2 << \" \" << (number_1 > number_2) << '\\n';\n    std::cout << string_1 << \" > \" << string_2 << \" \" << (string_1 > string_2) << '\\n';\n}\n

    Output:

    [1,2,3] > [1,2,4] false\n{\"A\":\"a\",\"B\":\"b\"} > {\"A\":\"a\",\"B\":\"b\"} false\n17 > 17.0000000000001 false\n\"foo\" > \"bar\" true\n
    "},{"location":"api/basic_json/operator_gt/#see-also","title":"See also","text":"
    • operator<=> comparison: 3-way
    "},{"location":"api/basic_json/operator_gt/#version-history","title":"Version history","text":"
    1. Added in version 1.0.0. Conditionally removed since C++20 in version 3.11.0.
    2. Added in version 1.0.0. Conditionally removed since C++20 in version 3.11.0.
    "},{"location":"api/basic_json/operator_le/","title":"nlohmann::basic_json::operator<=","text":"
    // until C++20\nbool operator<=(const_reference lhs, const_reference rhs) noexcept;   // (1)\n\ntemplate<typename ScalarType>\nbool operator<=(const_reference lhs, const ScalarType rhs) noexcept;  // (2)\n\ntemplate<typename ScalarType>\nbool operator<=(ScalarType lhs, const const_reference rhs) noexcept;  // (2)\n

    1. Compares whether one JSON value lhs is less than or equal to another JSON value rhs according to the following rules:

      • The comparison always yields false if (1) either operand is discarded, or (2) either operand is NaN and the other operand is either NaN or any other number.
      • Otherwise, returns the result of !(rhs < lhs) (see operator<).

    2. Compares whether a JSON value is less than or equal to a scalar or a scalar is less than or equal to a JSON value by converting the scalar to a JSON value and comparing both JSON values according to 1.

    "},{"location":"api/basic_json/operator_le/#template-parameters","title":"Template parameters","text":"ScalarType a scalar type according to std::is_scalar<ScalarType>::value"},{"location":"api/basic_json/operator_le/#parameters","title":"Parameters","text":"lhs (in) first value to consider rhs (in) second value to consider"},{"location":"api/basic_json/operator_le/#return-value","title":"Return value","text":"

    whether lhs is less than or equal to rhs

    "},{"location":"api/basic_json/operator_le/#exception-safety","title":"Exception safety","text":"

    No-throw guarantee: this function never throws exceptions.

    "},{"location":"api/basic_json/operator_le/#complexity","title":"Complexity","text":"

    Linear.

    "},{"location":"api/basic_json/operator_le/#notes","title":"Notes","text":"

    Comparing NaN

    NaN values are unordered within the domain of numbers. The following comparisons all yield false: 1. Comparing a NaN with itself. 2. Comparing a NaN with another NaN. 3. Comparing a NaN and any other number.

    Operator overload resolution

    Since C++20 overload resolution will consider the rewritten candidate generated from operator<=>.

    "},{"location":"api/basic_json/operator_le/#examples","title":"Examples","text":"Example

    The example demonstrates comparing several JSON types.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // create several JSON values\n    json array_1 = {1, 2, 3};\n    json array_2 = {1, 2, 4};\n    json object_1 = {{\"A\", \"a\"}, {\"B\", \"b\"}};\n    json object_2 = {{\"B\", \"b\"}, {\"A\", \"a\"}};\n    json number_1 = 17;\n    json number_2 = 17.0000000000001L;\n    json string_1 = \"foo\";\n    json string_2 = \"bar\";\n\n    // output values and comparisons\n    std::cout << std::boolalpha;\n    std::cout << array_1 << \" <= \" << array_2 << \" \" << (array_1 <= array_2) << '\\n';\n    std::cout << object_1 << \" <= \" << object_2 << \" \" << (object_1 <= object_2) << '\\n';\n    std::cout << number_1 << \" <= \" << number_2 << \" \" << (number_1 <= number_2) << '\\n';\n    std::cout << string_1 << \" <= \" << string_2 << \" \" << (string_1 <= string_2) << '\\n';\n}\n

    Output:

    [1,2,3] <= [1,2,4] true\n{\"A\":\"a\",\"B\":\"b\"} <= {\"A\":\"a\",\"B\":\"b\"} true\n17 <= 17.0000000000001 true\n\"foo\" <= \"bar\" false\n
    "},{"location":"api/basic_json/operator_le/#see-also","title":"See also","text":"
    • operator<=> comparison: 3-way
    "},{"location":"api/basic_json/operator_le/#version-history","title":"Version history","text":"
    1. Added in version 1.0.0. Conditionally removed since C++20 in version 3.11.0.
    2. Added in version 1.0.0. Conditionally removed since C++20 in version 3.11.0.
    "},{"location":"api/basic_json/operator_lt/","title":"nlohmann::basic_json::operator<","text":"
    // until C++20\nbool operator<(const_reference lhs, const_reference rhs) noexcept;   // (1)\n\ntemplate<typename ScalarType>\nbool operator<(const_reference lhs, const ScalarType rhs) noexcept;  // (2)\n\ntemplate<typename ScalarType>\nbool operator<(ScalarType lhs, const const_reference rhs) noexcept;  // (2)\n

    1. Compares whether one JSON value lhs is less than another JSON value rhs according to the following rules:

      • If either operand is discarded, the comparison yields false.
      • If both operands have the same type, the values are compared using their respective operator<.
      • Integer and floating-point numbers are automatically converted before comparison.
      • In case lhs and rhs have different types, the values are ignored and the order of the types is considered, which is:
        1. null
        2. boolean
        3. number (all types)
        4. object
        5. array
        6. string
        7. binary For instance, any boolean value is considered less than any string.

    2. Compares whether a JSON value is less than a scalar or a scalar is less than a JSON value by converting the scalar to a JSON value and comparing both JSON values according to 1.

    "},{"location":"api/basic_json/operator_lt/#template-parameters","title":"Template parameters","text":"ScalarType a scalar type according to std::is_scalar<ScalarType>::value"},{"location":"api/basic_json/operator_lt/#parameters","title":"Parameters","text":"lhs (in) first value to consider rhs (in) second value to consider"},{"location":"api/basic_json/operator_lt/#return-value","title":"Return value","text":"

    whether lhs is less than rhs

    "},{"location":"api/basic_json/operator_lt/#exception-safety","title":"Exception safety","text":"

    No-throw guarantee: this function never throws exceptions.

    "},{"location":"api/basic_json/operator_lt/#complexity","title":"Complexity","text":"

    Linear.

    "},{"location":"api/basic_json/operator_lt/#notes","title":"Notes","text":"

    Comparing NaN

    NaN values are unordered within the domain of numbers. The following comparisons all yield false: 1. Comparing a NaN with itself. 2. Comparing a NaN with another NaN. 3. Comparing a NaN and any other number.

    Operator overload resolution

    Since C++20 overload resolution will consider the rewritten candidate generated from operator<=>.

    "},{"location":"api/basic_json/operator_lt/#examples","title":"Examples","text":"Example

    The example demonstrates comparing several JSON types.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // create several JSON values\n    json array_1 = {1, 2, 3};\n    json array_2 = {1, 2, 4};\n    json object_1 = {{\"A\", \"a\"}, {\"B\", \"b\"}};\n    json object_2 = {{\"B\", \"b\"}, {\"A\", \"a\"}};\n    json number_1 = 17;\n    json number_2 = 17.0000000000001L;\n    json string_1 = \"foo\";\n    json string_2 = \"bar\";\n\n    // output values and comparisons\n    std::cout << std::boolalpha;\n    std::cout << array_1 << \" == \" << array_2 << \" \" << (array_1 < array_2) << '\\n';\n    std::cout << object_1 << \" == \" << object_2 << \" \" << (object_1 < object_2) << '\\n';\n    std::cout << number_1 << \" == \" << number_2 << \" \" << (number_1 < number_2) << '\\n';\n    std::cout << string_1 << \" == \" << string_2 << \" \" << (string_1 < string_2) << '\\n';\n}\n

    Output:

    [1,2,3] == [1,2,4] true\n{\"A\":\"a\",\"B\":\"b\"} == {\"A\":\"a\",\"B\":\"b\"} false\n17 == 17.0000000000001 true\n\"foo\" == \"bar\" false\n
    "},{"location":"api/basic_json/operator_lt/#see-also","title":"See also","text":"
    • operator<=> comparison: 3-way
    "},{"location":"api/basic_json/operator_lt/#version-history","title":"Version history","text":"
    1. Added in version 1.0.0. Conditionally removed since C++20 in version 3.11.0.
    2. Added in version 1.0.0. Conditionally removed since C++20 in version 3.11.0.
    "},{"location":"api/basic_json/operator_ne/","title":"nlohmann::basic_json::operator!=","text":"
    // until C++20\nbool operator!=(const_reference lhs, const_reference rhs) noexcept;   // (1)\n\ntemplate<typename ScalarType>\nbool operator!=(const_reference lhs, const ScalarType rhs) noexcept;  // (2)\n\ntemplate<typename ScalarType>\nbool operator!=(ScalarType lhs, const const_reference rhs) noexcept;  // (2)\n\n// since C++20\nclass basic_json {\n    bool operator!=(const_reference rhs) const noexcept;              // (1)\n\n    template<typename ScalarType>\n    bool operator!=(ScalarType rhs) const noexcept;                   // (2)\n};\n

    1. Compares two JSON values for inequality according to the following rules:

      • The comparison always yields false if (1) either operand is discarded, or (2) either operand is NaN and the other operand is either NaN or any other number.
      • Otherwise, returns the result of !(lhs == rhs) (until C++20) or !(*this == rhs) (since C++20).

    2. Compares a JSON value and a scalar or a scalar and a JSON value for inequality by converting the scalar to a JSON value and comparing both JSON values according to 1.

    "},{"location":"api/basic_json/operator_ne/#template-parameters","title":"Template parameters","text":"ScalarType a scalar type according to std::is_scalar<ScalarType>::value"},{"location":"api/basic_json/operator_ne/#parameters","title":"Parameters","text":"lhs (in) first value to consider rhs (in) second value to consider"},{"location":"api/basic_json/operator_ne/#return-value","title":"Return value","text":"

    whether the values lhs/*this and rhs are not equal

    "},{"location":"api/basic_json/operator_ne/#exception-safety","title":"Exception safety","text":"

    No-throw guarantee: this function never throws exceptions.

    "},{"location":"api/basic_json/operator_ne/#complexity","title":"Complexity","text":"

    Linear.

    "},{"location":"api/basic_json/operator_ne/#notes","title":"Notes","text":"

    Comparing NaN

    NaN values are unordered within the domain of numbers. The following comparisons all yield false: 1. Comparing a NaN with itself. 2. Comparing a NaN with another NaN. 3. Comparing a NaN and any other number.

    "},{"location":"api/basic_json/operator_ne/#examples","title":"Examples","text":"Example

    The example demonstrates comparing several JSON types.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // create several JSON values\n    json array_1 = {1, 2, 3};\n    json array_2 = {1, 2, 4};\n    json object_1 = {{\"A\", \"a\"}, {\"B\", \"b\"}};\n    json object_2 = {{\"B\", \"b\"}, {\"A\", \"a\"}};\n    json number_1 = 17;\n    json number_2 = 17.000000000000001L;\n    json string_1 = \"foo\";\n    json string_2 = \"bar\";\n\n    // output values and comparisons\n    std::cout << std::boolalpha;\n    std::cout << array_1 << \" != \" << array_2 << \" \" << (array_1 != array_2) << '\\n';\n    std::cout << object_1 << \" != \" << object_2 << \" \" << (object_1 != object_2) << '\\n';\n    std::cout << number_1 << \" != \" << number_2 << \" \" << (number_1 != number_2) << '\\n';\n    std::cout << string_1 << \" != \" << string_2 << \" \" << (string_1 != string_2) << '\\n';\n}\n

    Output:

    [1,2,3] != [1,2,4] true\n{\"A\":\"a\",\"B\":\"b\"} != {\"A\":\"a\",\"B\":\"b\"} false\n17 != 17.0 false\n\"foo\" != \"bar\" true\n
    Example

    The example demonstrates comparing several JSON types against the null pointer (JSON null).

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // create several JSON values\n    json array = {1, 2, 3};\n    json object = {{\"A\", \"a\"}, {\"B\", \"b\"}};\n    json number = 17;\n    json string = \"foo\";\n    json null;\n\n    // output values and comparisons\n    std::cout << std::boolalpha;\n    std::cout << array << \" != nullptr \" << (array != nullptr) << '\\n';\n    std::cout << object << \" != nullptr \" << (object != nullptr) << '\\n';\n    std::cout << number << \" != nullptr \" << (number != nullptr) << '\\n';\n    std::cout << string << \" != nullptr \" << (string != nullptr) << '\\n';\n    std::cout << null << \" != nullptr \" << (null != nullptr) << '\\n';\n}\n

    Output:

    [1,2,3] != nullptr true\n{\"A\":\"a\",\"B\":\"b\"} != nullptr true\n17 != nullptr true\n\"foo\" != nullptr true\nnull != nullptr false\n
    "},{"location":"api/basic_json/operator_ne/#version-history","title":"Version history","text":"
    1. Added in version 1.0.0. Added C++20 member functions in version 3.11.0.
    2. Added in version 1.0.0. Added C++20 member functions in version 3.11.0.
    "},{"location":"api/basic_json/operator_spaceship/","title":"nlohmann::basic_json::operator<=>","text":"
    // since C++20\nclass basic_json {\n    std::partial_ordering operator<=>(const_reference rhs) const noexcept;  // (1)\n\n    template<typename ScalarType>\n    std::partial_ordering operator<=>(const ScalarType rhs) const noexcept; // (2)\n};\n

    1. 3-way compares two JSON values producing a result of type std::partial_ordering according to the following rules:

      • Two JSON values compare with a result of std::partial_ordering::unordered if either value is discarded.
      • If both JSON values are of the same type, the result is produced by 3-way comparing their stored values using their respective operator<=>.
      • Integer and floating-point numbers are converted to their common type and then 3-way compared using their respective operator<=>. For instance, comparing an integer and a floating-point value will 3-way compare the first value converted to floating-point with the second value.
      • Otherwise, yields a result by comparing the type (see value_t).

    2. 3-way compares a JSON value and a scalar or a scalar and a JSON value by converting the scalar to a JSON value and 3-way comparing both JSON values (see 1).

    "},{"location":"api/basic_json/operator_spaceship/#template-parameters","title":"Template parameters","text":"ScalarType a scalar type according to std::is_scalar<ScalarType>::value"},{"location":"api/basic_json/operator_spaceship/#parameters","title":"Parameters","text":"rhs (in) second value to consider"},{"location":"api/basic_json/operator_spaceship/#return-value","title":"Return value","text":"

    the std::partial_ordering of the 3-way comparison of *this and rhs

    "},{"location":"api/basic_json/operator_spaceship/#exception-safety","title":"Exception safety","text":"

    No-throw guarantee: this function never throws exceptions.

    "},{"location":"api/basic_json/operator_spaceship/#complexity","title":"Complexity","text":"

    Linear.

    "},{"location":"api/basic_json/operator_spaceship/#notes","title":"Notes","text":"

    Comparing NaN

    • NaN values are unordered within the domain of numbers. The following comparisons all yield std::partial_ordering::unordered:
      1. Comparing a NaN with itself.
      2. Comparing a NaN with another NaN.
      3. Comparing a NaN and any other number.
    "},{"location":"api/basic_json/operator_spaceship/#examples","title":"Examples","text":"Example: (1) comparing JSON values

    The example demonstrates comparing several JSON values.

    #include <compare>\n#include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nconst char* to_string(const std::partial_ordering& po)\n{\n    if (std::is_lt(po))\n    {\n        return \"less\";\n    }\n    else if (std::is_gt(po))\n    {\n        return \"greater\";\n    }\n    else if (std::is_eq(po))\n    {\n        return \"equivalent\";\n    }\n    return \"unordered\";\n}\n\nint main()\n{\n    // create several JSON values\n    json array_1 = {1, 2, 3};\n    json array_2 = {1, 2, 4};\n    json object_1 = {{\"A\", \"a\"}, {\"B\", \"b\"}};\n    json object_2 = {{\"B\", \"b\"}, {\"A\", \"a\"}};\n    json number = 17;\n    json string = \"foo\";\n    json discarded = json(json::value_t::discarded);\n\n    // output values and comparisons\n    std::cout << array_1 << \" <=> \" << array_2 << \" := \" << to_string(array_1 <=> array_2) << '\\n'; // *NOPAD*\n    std::cout << object_1 << \" <=> \" << object_2 << \" := \" << to_string(object_1 <=> object_2) << '\\n'; // *NOPAD*\n    std::cout << string << \" <=> \" << number << \" := \" << to_string(string <=> number) << '\\n'; // *NOPAD*\n    std::cout << string << \" <=> \" << discarded << \" := \" << to_string(string <=> discarded) << '\\n'; // *NOPAD*\n}\n

    Output:

    [1,2,3] <=> [1,2,4] := less\n{\"A\":\"a\",\"B\":\"b\"} <=> {\"A\":\"a\",\"B\":\"b\"} := equivalent\n\"foo\" <=> 17 := greater\n\"foo\" <=> <discarded> := unordered\n
    Example: (2) comparing JSON values and scalars

    The example demonstrates comparing several JSON values and scalars.

    #include <compare>\n#include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nconst char* to_string(const std::partial_ordering& po)\n{\n    if (std::is_lt(po))\n    {\n        return \"less\";\n    }\n    else if (std::is_gt(po))\n    {\n        return \"greater\";\n    }\n    else if (std::is_eq(po))\n    {\n        return \"equivalent\";\n    }\n    return \"unordered\";\n}\n\nint main()\n{\n    using float_limits = std::numeric_limits<json::number_float_t>;\n    constexpr auto nan = float_limits::quiet_NaN();\n\n    // create several JSON values\n    json boolean = false;\n    json number = 17;\n    json string = \"17\";\n\n    // output values and comparisons\n    std::cout << std::boolalpha << std::fixed;\n    std::cout << boolean << \" <=> \" << true << \" := \" << to_string(boolean <=> true) << '\\n'; // *NOPAD*\n    std::cout << number << \" <=> \" << 17.0 << \" := \" << to_string(number <=> 17.0) << '\\n'; // *NOPAD*\n    std::cout << number << \" <=> \" << nan << \" := \" << to_string(number <=> nan) << '\\n'; // *NOPAD*\n    std::cout << string << \" <=> \" << 17 << \" := \" << to_string(string <=> 17) << '\\n'; // *NOPAD*\n}\n

    Output:

    false <=> true := less\n17 <=> 17.000000 := equivalent\n17 <=> nan := unordered\n\"17\" <=> 17 := greater\n
    "},{"location":"api/basic_json/operator_spaceship/#see-also","title":"See also","text":"
    • operator== - comparison: equal
    • operator!= - comparison: not equal
    • operator< - comparison: less than
    • operator<= - comparison: less than or equal
    • operator> - comparison: greater than
    • operator>= - comparison: greater than or equal
    "},{"location":"api/basic_json/operator_spaceship/#version-history","title":"Version history","text":"
    1. Added in version 3.11.0.
    2. Added in version 3.11.0.
    "},{"location":"api/basic_json/operator_value_t/","title":"nlohmann::basic_json::operator value_t","text":"
    constexpr operator value_t() const noexcept;\n

    Return the type of the JSON value as a value from the value_t enumeration.

    "},{"location":"api/basic_json/operator_value_t/#return-value","title":"Return value","text":"

    the type of the JSON value

    Value type return value null value_t::null boolean value_t::boolean string value_t::string number (integer) value_t::number_integer number (unsigned integer) value_t::number_unsigned number (floating-point) value_t::number_float object value_t::object array value_t::array binary value_t::binary discarded value_t::discarded"},{"location":"api/basic_json/operator_value_t/#exception-safety","title":"Exception safety","text":"

    No-throw guarantee: this member function never throws exceptions.

    "},{"location":"api/basic_json/operator_value_t/#complexity","title":"Complexity","text":"

    Constant.

    "},{"location":"api/basic_json/operator_value_t/#examples","title":"Examples","text":"Example

    The following code exemplifies operator value_t() for all JSON types.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // create JSON values\n    json j_null;\n    json j_boolean = true;\n    json j_number_integer = -17;\n    json j_number_unsigned = 42u;\n    json j_number_float = 23.42;\n    json j_object = {{\"one\", 1}, {\"two\", 2}};\n    json j_array = {1, 2, 4, 8, 16};\n    json j_string = \"Hello, world\";\n\n    // call operator value_t()\n    json::value_t t_null = j_null;\n    json::value_t t_boolean = j_boolean;\n    json::value_t t_number_integer = j_number_integer;\n    json::value_t t_number_unsigned = j_number_unsigned;\n    json::value_t t_number_float = j_number_float;\n    json::value_t t_object = j_object;\n    json::value_t t_array = j_array;\n    json::value_t t_string = j_string;\n\n    // print types\n    std::cout << std::boolalpha;\n    std::cout << (t_null == json::value_t::null) << '\\n';\n    std::cout << (t_boolean == json::value_t::boolean) << '\\n';\n    std::cout << (t_number_integer == json::value_t::number_integer) << '\\n';\n    std::cout << (t_number_unsigned == json::value_t::number_unsigned) << '\\n';\n    std::cout << (t_number_float == json::value_t::number_float) << '\\n';\n    std::cout << (t_object == json::value_t::object) << '\\n';\n    std::cout << (t_array == json::value_t::array) << '\\n';\n    std::cout << (t_string == json::value_t::string) << '\\n';\n}\n

    Output:

    true\ntrue\ntrue\ntrue\ntrue\ntrue\ntrue\ntrue\n
    "},{"location":"api/basic_json/operator_value_t/#version-history","title":"Version history","text":"
    • Added in version 1.0.0.
    • Added unsigned integer type in version 2.0.0.
    • Added binary type in version 3.8.0.
    "},{"location":"api/basic_json/other_error/","title":"nlohmann::basic_json::other_error","text":"
    class other_error : public exception;\n

    This exception is thrown in case of errors that cannot be classified with the other exception types.

    Exceptions have ids 5xx (see list of other errors).

    classDiagram\n  direction LR\n\n    class std_exception [\"std::exception\"] {\n        <<interface>>\n    }\n\n    class json_exception [\"basic_json::exception\"] {\n        +const int id\n        +const char* what() const\n    }\n\n    class json_parse_error [\"basic_json::parse_error\"] {\n        +const std::size_t byte\n    }\n\n    class json_invalid_iterator [\"basic_json::invalid_iterator\"]\n    class json_type_error [\"basic_json::type_error\"]\n    class json_out_of_range [\"basic_json::out_of_range\"]\n    class json_other_error [\"basic_json::other_error\"]\n\n    std_exception <|-- json_exception\n    json_exception <|-- json_parse_error\n    json_exception <|-- json_invalid_iterator\n    json_exception <|-- json_type_error\n    json_exception <|-- json_out_of_range\n    json_exception <|-- json_other_error\n\n    style json_other_error fill:#CCCCFF
    "},{"location":"api/basic_json/other_error/#member-functions","title":"Member functions","text":"
    • what - returns explanatory string
    "},{"location":"api/basic_json/other_error/#member-variables","title":"Member variables","text":"
    • id - the id of the exception
    "},{"location":"api/basic_json/other_error/#examples","title":"Examples","text":"Example

    The following code shows how a other_error exception can be caught.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\nusing namespace nlohmann::literals;\n\nint main()\n{\n    try\n    {\n        // executing a failing JSON Patch operation\n        json value = R\"({\n            \"best_biscuit\": {\n                \"name\": \"Oreo\"\n            }\n        })\"_json;\n        json patch = R\"([{\n            \"op\": \"test\",\n            \"path\": \"/best_biscuit/name\",\n            \"value\": \"Choco Leibniz\"\n        }])\"_json;\n        value.patch(patch);\n    }\n    catch (const json::other_error& e)\n    {\n        // output exception information\n        std::cout << \"message: \" << e.what() << '\\n'\n                  << \"exception id: \" << e.id << std::endl;\n    }\n}\n

    Output:

    message: [json.exception.other_error.501] unsuccessful: {\"op\":\"test\",\"path\":\"/best_biscuit/name\",\"value\":\"Choco Leibniz\"}\nexception id: 501\n
    "},{"location":"api/basic_json/other_error/#see-also","title":"See also","text":"
    • List of other errors
    • parse_error for exceptions indicating a parse error
    • invalid_iterator for exceptions indicating errors with iterators
    • type_error for exceptions indicating executing a member function with a wrong type
    • out_of_range for exceptions indicating access out of the defined range
    "},{"location":"api/basic_json/other_error/#version-history","title":"Version history","text":"
    • Since version 3.0.0.
    "},{"location":"api/basic_json/out_of_range/","title":"nlohmann::basic_json::out_of_range","text":"
    class out_of_range : public exception;\n

    This exception is thrown in case a library function is called on an input parameter that exceeds the expected range, for instance, in the case of array indices or nonexisting object keys.

    Exceptions have ids 4xx (see list of out-of-range errors).

    classDiagram\n  direction LR\n\n    class std_exception [\"std::exception\"] {\n        <<interface>>\n    }\n\n    class json_exception [\"basic_json::exception\"] {\n        +const int id\n        +const char* what() const\n    }\n\n    class json_parse_error [\"basic_json::parse_error\"] {\n        +const std::size_t byte\n    }\n\n    class json_invalid_iterator [\"basic_json::invalid_iterator\"]\n    class json_type_error [\"basic_json::type_error\"]\n    class json_out_of_range [\"basic_json::out_of_range\"]\n    class json_other_error [\"basic_json::other_error\"]\n\n    std_exception <|-- json_exception\n    json_exception <|-- json_parse_error\n    json_exception <|-- json_invalid_iterator\n    json_exception <|-- json_type_error\n    json_exception <|-- json_out_of_range\n    json_exception <|-- json_other_error\n\n    style json_out_of_range fill:#CCCCFF
    "},{"location":"api/basic_json/out_of_range/#member-functions","title":"Member functions","text":"
    • what - returns explanatory string
    "},{"location":"api/basic_json/out_of_range/#member-variables","title":"Member variables","text":"
    • id - the id of the exception
    "},{"location":"api/basic_json/out_of_range/#examples","title":"Examples","text":"Example

    The following code shows how a out_of_range exception can be caught.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    try\n    {\n        // calling at() for an invalid index\n        json j = {1, 2, 3, 4};\n        j.at(4) = 10;\n    }\n    catch (const json::out_of_range& e)\n    {\n        // output exception information\n        std::cout << \"message: \" << e.what() << '\\n'\n                  << \"exception id: \" << e.id << std::endl;\n    }\n}\n

    Output:

    message: [json.exception.out_of_range.401] array index 4 is out of range\nexception id: 401\n
    "},{"location":"api/basic_json/out_of_range/#see-also","title":"See also","text":"
    • List of out-of-range errors
    • parse_error for exceptions indicating a parse error
    • invalid_iterator for exceptions indicating errors with iterators
    • type_error for exceptions indicating executing a member function with a wrong type
    • other_error for exceptions indicating other library errors
    "},{"location":"api/basic_json/out_of_range/#version-history","title":"Version history","text":"
    • Since version 3.0.0.
    "},{"location":"api/basic_json/parse/","title":"nlohmann::basic_json::parse","text":"
    // (1)\ntemplate<typename InputType>\nstatic basic_json parse(InputType&& i,\n                        const parser_callback_t cb = nullptr,\n                        const bool allow_exceptions = true,\n                        const bool ignore_comments = false,\n                        const bool ignore_trailing_commas = false);\n\n// (2)\ntemplate<typename IteratorType>\nstatic basic_json parse(IteratorType first, IteratorType last,\n                        const parser_callback_t cb = nullptr,\n                        const bool allow_exceptions = true,\n                        const bool ignore_comments = false,\n                        const bool ignore_trailing_commas = false);\n
    1. Deserialize from a compatible input.

    2. Deserialize from a pair of character iterators

      The value_type of the iterator must be an integral type with size of 1, 2, or 4 bytes, which will be interpreted respectively as UTF-8, UTF-16, and UTF-32.

    "},{"location":"api/basic_json/parse/#template-parameters","title":"Template parameters","text":"InputType

    A compatible input, for instance:

    • an std::istream object
    • a FILE pointer (throws if null)
    • a C-style array of characters
    • a pointer to a null-terminated string of single byte characters (throws if null)
    • a std::string
    • an object obj for which begin(obj) and end(obj) produces a valid pair of iterators.
    IteratorType

    a compatible iterator type, for instance.

    • a pair of std::string::iterator or std::vector<std::uint8_t>::iterator
    • a pair of pointers such as ptr and ptr + len
    "},{"location":"api/basic_json/parse/#parameters","title":"Parameters","text":"i (in) Input to parse from. cb (in) a parser callback function of type parser_callback_t which is used to control the deserialization by filtering unwanted values (optional) allow_exceptions (in) whether to throw exceptions in case of a parse error (optional, true by default) ignore_comments (in) whether comments should be ignored and treated like whitespace (true) or yield a parse error (false); (optional, false by default) ignore_trailing_commas (in) whether trailing commas in arrays or objects should be ignored and treated like whitespace (true) or yield a parse error (false); (optional, false by default) first (in) iterator to the start of a character range last (in) iterator to the end of a character range"},{"location":"api/basic_json/parse/#return-value","title":"Return value","text":"

    Deserialized JSON value; in case of a parse error and allow_exceptions set to false, the return value will be value_t::discarded. The latter can be checked with is_discarded.

    "},{"location":"api/basic_json/parse/#exception-safety","title":"Exception safety","text":"

    Strong guarantee: if an exception is thrown, there are no changes in the JSON value.

    "},{"location":"api/basic_json/parse/#exceptions","title":"Exceptions","text":"
    • Throws parse_error.101 in case of an unexpected token, or empty input like a null FILE* or char* pointer.
    • Throws parse_error.102 if to_unicode fails or surrogate error.
    • Throws parse_error.103 if to_unicode fails.
    "},{"location":"api/basic_json/parse/#complexity","title":"Complexity","text":"

    Linear in the length of the input. The parser is a predictive LL(1) parser. The complexity can be higher if the parser callback function cb or reading from (1) the input i or (2) the iterator range [first, last] has a super-linear complexity.

    "},{"location":"api/basic_json/parse/#notes","title":"Notes","text":"

    A UTF-8 byte order mark is silently ignored.

    "},{"location":"api/basic_json/parse/#examples","title":"Examples","text":"Parsing from a character array

    The example below demonstrates the parse() function reading from an array.

    #include <iostream>\n#include <iomanip>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // a JSON text\n    char text[] = R\"(\n    {\n        \"Image\": {\n            \"Width\":  800,\n            \"Height\": 600,\n            \"Title\":  \"View from 15th Floor\",\n            \"Thumbnail\": {\n                \"Url\":    \"http://www.example.com/image/481989943\",\n                \"Height\": 125,\n                \"Width\":  100\n            },\n            \"Animated\" : false,\n            \"IDs\": [116, 943, 234, 38793]\n        }\n    }\n    )\";\n\n    // parse and serialize JSON\n    json j_complete = json::parse(text);\n    std::cout << std::setw(4) << j_complete << \"\\n\\n\";\n}\n

    Output:

    {\n    \"Image\": {\n        \"Animated\": false,\n        \"Height\": 600,\n        \"IDs\": [\n            116,\n            943,\n            234,\n            38793\n        ],\n        \"Thumbnail\": {\n            \"Height\": 125,\n            \"Url\": \"http://www.example.com/image/481989943\",\n            \"Width\": 100\n        },\n        \"Title\": \"View from 15th Floor\",\n        \"Width\": 800\n    }\n}\n
    Parsing from a string

    The example below demonstrates the parse() function with and without callback function.

    #include <iostream>\n#include <iomanip>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // a JSON text\n    auto text = R\"(\n    {\n        \"Image\": {\n            \"Width\":  800,\n            \"Height\": 600,\n            \"Title\":  \"View from 15th Floor\",\n            \"Thumbnail\": {\n                \"Url\":    \"http://www.example.com/image/481989943\",\n                \"Height\": 125,\n                \"Width\":  100\n            },\n            \"Animated\" : false,\n            \"IDs\": [116, 943, 234, 38793]\n        }\n    }\n    )\";\n\n    // parse and serialize JSON\n    json j_complete = json::parse(text);\n    std::cout << std::setw(4) << j_complete << \"\\n\\n\";\n\n    // define parser callback\n    json::parser_callback_t cb = [](int depth, json::parse_event_t event, json & parsed)\n    {\n        // skip object elements with key \"Thumbnail\"\n        if (event == json::parse_event_t::key and parsed == json(\"Thumbnail\"))\n        {\n            return false;\n        }\n        else\n        {\n            return true;\n        }\n    };\n\n    // parse (with callback) and serialize JSON\n    json j_filtered = json::parse(text, cb);\n    std::cout << std::setw(4) << j_filtered << '\\n';\n}\n

    Output:

    {\n    \"Image\": {\n        \"Animated\": false,\n        \"Height\": 600,\n        \"IDs\": [\n            116,\n            943,\n            234,\n            38793\n        ],\n        \"Thumbnail\": {\n            \"Height\": 125,\n            \"Url\": \"http://www.example.com/image/481989943\",\n            \"Width\": 100\n        },\n        \"Title\": \"View from 15th Floor\",\n        \"Width\": 800\n    }\n}\n\n{\n    \"Image\": {\n        \"Animated\": false,\n        \"Height\": 600,\n        \"IDs\": [\n            116,\n            943,\n            234,\n            38793\n        ],\n        \"Title\": \"View from 15th Floor\",\n        \"Width\": 800\n    }\n}\n
    Parsing from an input stream

    The example below demonstrates the parse() function with and without callback function.

    #include <iostream>\n#include <iomanip>\n#include <sstream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // a JSON text\n    auto text = R\"(\n    {\n        \"Image\": {\n            \"Width\":  800,\n            \"Height\": 600,\n            \"Title\":  \"View from 15th Floor\",\n            \"Thumbnail\": {\n                \"Url\":    \"http://www.example.com/image/481989943\",\n                \"Height\": 125,\n                \"Width\":  100\n            },\n            \"Animated\" : false,\n            \"IDs\": [116, 943, 234, 38793]\n        }\n    }\n    )\";\n\n    // fill a stream with JSON text\n    std::stringstream ss;\n    ss << text;\n\n    // parse and serialize JSON\n    json j_complete = json::parse(ss);\n    std::cout << std::setw(4) << j_complete << \"\\n\\n\";\n\n    // define parser callback\n    json::parser_callback_t cb = [](int depth, json::parse_event_t event, json & parsed)\n    {\n        // skip object elements with key \"Thumbnail\"\n        if (event == json::parse_event_t::key and parsed == json(\"Thumbnail\"))\n        {\n            return false;\n        }\n        else\n        {\n            return true;\n        }\n    };\n\n    // fill a stream with JSON text\n    ss.clear();\n    ss << text;\n\n    // parse (with callback) and serialize JSON\n    json j_filtered = json::parse(ss, cb);\n    std::cout << std::setw(4) << j_filtered << '\\n';\n}\n

    Output:

    {\n    \"Image\": {\n        \"Animated\": false,\n        \"Height\": 600,\n        \"IDs\": [\n            116,\n            943,\n            234,\n            38793\n        ],\n        \"Thumbnail\": {\n            \"Height\": 125,\n            \"Url\": \"http://www.example.com/image/481989943\",\n            \"Width\": 100\n        },\n        \"Title\": \"View from 15th Floor\",\n        \"Width\": 800\n    }\n}\n\n{\n    \"Image\": {\n        \"Animated\": false,\n        \"Height\": 600,\n        \"IDs\": [\n            116,\n            943,\n            234,\n            38793\n        ],\n        \"Title\": \"View from 15th Floor\",\n        \"Width\": 800\n    }\n}\n
    Parsing from a contiguous container

    The example below demonstrates the parse() function reading from a contiguous container.

    #include <iostream>\n#include <iomanip>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // a JSON text given as std::vector\n    std::vector<std::uint8_t> text = {'[', '1', ',', '2', ',', '3', ']', '\\0'};\n\n    // parse and serialize JSON\n    json j_complete = json::parse(text);\n    std::cout << std::setw(4) << j_complete << \"\\n\\n\";\n}\n

    Output:

    [\n    1,\n    2,\n    3\n]\n
    Parsing from a non-null-terminated string

    The example below demonstrates the parse() function reading from a string that is not null-terminated.

    #include <iostream>\n#include <iomanip>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // a JSON text given as string that is not null-terminated\n    const char* ptr = \"[1,2,3]another value\";\n\n    // parse and serialize JSON\n    json j_complete = json::parse(ptr, ptr + 7);\n    std::cout << std::setw(4) << j_complete << \"\\n\\n\";\n}\n

    Output:

    [\n    1,\n    2,\n    3\n]\n
    Parsing from an iterator pair

    The example below demonstrates the parse() function reading from an iterator pair.

    #include <iostream>\n#include <iomanip>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // a JSON text given an input with other values\n    std::vector<std::uint8_t> input = {'[', '1', ',', '2', ',', '3', ']', 'o', 't', 'h', 'e', 'r'};\n\n    // parse and serialize JSON\n    json j_complete = json::parse(input.begin(), input.begin() + 7);\n    std::cout << std::setw(4) << j_complete << \"\\n\\n\";\n}\n

    Output:

    [\n    1,\n    2,\n    3\n]\n
    Effect of allow_exceptions parameter

    The example below demonstrates the effect of the allow_exceptions parameter in the \u00b4parse()` function.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // an invalid JSON text\n    std::string text = R\"(\n    {\n        \"key\": \"value without closing quotes\n    }\n    )\";\n\n    // parse with exceptions\n    try\n    {\n        json j = json::parse(text);\n    }\n    catch (const json::parse_error& e)\n    {\n        std::cout << e.what() << std::endl;\n    }\n\n    // parse without exceptions\n    json j = json::parse(text, nullptr, false);\n\n    if (j.is_discarded())\n    {\n        std::cout << \"the input is invalid JSON\" << std::endl;\n    }\n    else\n    {\n        std::cout << \"the input is valid JSON: \" << j << std::endl;\n    }\n}\n

    Output:

    [json.exception.parse_error.101] parse error at line 4, column 0: syntax error while parsing value - invalid string: control character U+000A (LF) must be escaped to \\u000A or \\n; last read: '\"value without closing quotes<U+000A>'\nthe input is invalid JSON\n
    Effect of ignore_comments parameter

    The example below demonstrates the effect of the ignore_comments parameter in the parse() function.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    std::string s = R\"(\n    {\n        // update in 2006: removed Pluto\n        \"planets\": [\"Mercury\", \"Venus\", \"Earth\", \"Mars\",\n                    \"Jupiter\", \"Uranus\", \"Neptune\" /*, \"Pluto\" */]\n    }\n    )\";\n\n    try\n    {\n        json j = json::parse(s);\n    }\n    catch (json::exception& e)\n    {\n        std::cout << e.what() << std::endl;\n    }\n\n    json j = json::parse(s,\n                         /* callback */ nullptr,\n                         /* allow exceptions */ true,\n                         /* ignore_comments */ true);\n    std::cout << j.dump(2) << '\\n';\n}\n

    Output:

    [json.exception.parse_error.101] parse error at line 3, column 9: syntax error while parsing object key - invalid literal; last read: '<U+000A>    {<U+000A>        /'; expected string literal\n{\n  \"planets\": [\n    \"Mercury\",\n    \"Venus\",\n    \"Earth\",\n    \"Mars\",\n    \"Jupiter\",\n    \"Uranus\",\n    \"Neptune\"\n  ]\n}\n
    Effect of ignore_trailing_commas parameter

    The example below demonstrates the effect of the ignore_trailing_commas parameter in the parse() function.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    std::string s = R\"(\n    {\n        \"planets\": [\n            \"Mercury\",\n            \"Venus\",\n            \"Earth\",\n            \"Mars\",\n            \"Jupiter\",\n            \"Uranus\",\n            \"Neptune\",\n        ]\n    }\n    )\";\n\n    try\n    {\n        json j = json::parse(s);\n    }\n    catch (json::exception& e)\n    {\n        std::cout << e.what() << std::endl;\n    }\n\n    json j = json::parse(s,\n                         /* callback */ nullptr,\n                         /* allow exceptions */ true,\n                         /* ignore_comments */ false,\n                         /* ignore_trailing_commas */ true);\n    std::cout << j.dump(2) << '\\n';\n}\n

    Output:

    [json.exception.parse_error.101] parse error at line 11, column 9: syntax error while parsing value - unexpected ']'; expected '[', '{', or a literal\n{\n  \"planets\": [\n    \"Mercury\",\n    \"Venus\",\n    \"Earth\",\n    \"Mars\",\n    \"Jupiter\",\n    \"Uranus\",\n    \"Neptune\"\n  ]\n}\n
    "},{"location":"api/basic_json/parse/#see-also","title":"See also","text":"
    • accept - check if the input is valid JSON
    • operator>> - deserialize from stream
    "},{"location":"api/basic_json/parse/#version-history","title":"Version history","text":"
    • Added in version 1.0.0.
    • Overload for contiguous containers (1) added in version 2.0.3.
    • Ignoring comments via ignore_comments added in version 3.9.0.
    • Changed runtime assertion in case of FILE* null pointers to exception in version 3.12.0.
    • Added ignore_trailing_commas in version 3.12.1.

    Deprecation

    Overload (2) replaces calls to parse with a pair of iterators as their first parameter which has been deprecated in version 3.8.0. This overload will be removed in version 4.0.0. Please replace all calls like parse({ptr, ptr+len}, ...); with parse(ptr, ptr+len, ...);.

    You should be warned by your compiler with a -Wdeprecated-declarations warning if you are using a deprecated function.

    "},{"location":"api/basic_json/parse_error/","title":"nlohmann::basic_json::parse_error","text":"
    class parse_error : public exception;\n

    The library throws this exception when a parse error occurs. Parse errors can occur during the deserialization of JSON text, BSON, CBOR, MessagePack, UBJSON, as well as when using JSON Patch.

    Member byte holds the byte index of the last read character in the input file (see note below).

    Exceptions have ids 1xx (see list of parse errors).

    classDiagram\n  direction LR\n\n    class std_exception [\"std::exception\"] {\n        <<interface>>\n    }\n\n    class json_exception [\"basic_json::exception\"] {\n        +const int id\n        +const char* what() const\n    }\n\n    class json_parse_error [\"basic_json::parse_error\"] {\n        +const std::size_t byte\n    }\n\n    class json_invalid_iterator [\"basic_json::invalid_iterator\"]\n    class json_type_error [\"basic_json::type_error\"]\n    class json_out_of_range [\"basic_json::out_of_range\"]\n    class json_other_error [\"basic_json::other_error\"]\n\n    std_exception <|-- json_exception\n    json_exception <|-- json_parse_error\n    json_exception <|-- json_invalid_iterator\n    json_exception <|-- json_type_error\n    json_exception <|-- json_out_of_range\n    json_exception <|-- json_other_error\n\n    style json_parse_error fill:#CCCCFF
    "},{"location":"api/basic_json/parse_error/#member-functions","title":"Member functions","text":"
    • what - returns explanatory string
    "},{"location":"api/basic_json/parse_error/#member-variables","title":"Member variables","text":"
    • id - the id of the exception
    • byte - byte index of the parse error
    "},{"location":"api/basic_json/parse_error/#notes","title":"Notes","text":"

    For an input with n bytes, 1 is the index of the first character and n+1 is the index of the terminating null byte or the end of file. This also holds true when reading a byte vector for binary formats.

    "},{"location":"api/basic_json/parse_error/#examples","title":"Examples","text":"Example

    The following code shows how a parse_error exception can be caught.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    try\n    {\n        // parsing input with a syntax error\n        json::parse(\"[1,2,3,]\");\n    }\n    catch (const json::parse_error& e)\n    {\n        // output exception information\n        std::cout << \"message: \" << e.what() << '\\n'\n                  << \"exception id: \" << e.id << '\\n'\n                  << \"byte position of error: \" << e.byte << std::endl;\n    }\n}\n

    Output:

    message: [json.exception.parse_error.101] parse error at line 1, column 8: syntax error while parsing value - unexpected ']'; expected '[', '{', or a literal\nexception id: 101\nbyte position of error: 8\n
    "},{"location":"api/basic_json/parse_error/#see-also","title":"See also","text":"
    • List of parse errors
    • invalid_iterator for exceptions indicating errors with iterators
    • type_error for exceptions indicating executing a member function with a wrong type
    • out_of_range for exceptions indicating access out of the defined range
    • other_error for exceptions indicating other library errors
    "},{"location":"api/basic_json/parse_error/#version-history","title":"Version history","text":"
    • Since version 3.0.0.
    "},{"location":"api/basic_json/parse_event_t/","title":"nlohmann::basic_json::parse_event_t","text":"
    enum class parse_event_t : std::uint8_t {\n    object_start,\n    object_end,\n    array_start,\n    array_end,\n    key,\n    value\n};\n

    The parser callback distinguishes the following events:

    • object_start: the parser read { and started to process a JSON object
    • key: the parser read a key of a value in an object
    • object_end: the parser read } and finished processing a JSON object
    • array_start: the parser read [ and started to process a JSON array
    • array_end: the parser read ] and finished processing a JSON array
    • value: the parser finished reading a JSON value
    "},{"location":"api/basic_json/parse_event_t/#examples","title":"Examples","text":""},{"location":"api/basic_json/parse_event_t/#version-history","title":"Version history","text":"
    • Added in version 1.0.0.
    "},{"location":"api/basic_json/parser_callback_t/","title":"nlohmann::basic_json::parser_callback_t","text":"
    template<typename BasicJsonType>\nusing parser_callback_t =\n    std::function<bool(int depth, parse_event_t event, BasicJsonType& parsed)>;\n

    With a parser callback function, the result of parsing a JSON text can be influenced. When passed to parse, it is called on certain events (passed as parse_event_t via parameter event) with a set recursion depth depth and context JSON value parsed. The return value of the callback function is a boolean indicating whether the element that emitted the callback shall be kept or not.

    We distinguish six scenarios (determined by the event type) in which the callback function can be called. The following table describes the values of the parameters depth, event, and parsed.

    parameter event description parameter depth parameter parsed parse_event_t::object_start the parser read { and started to process a JSON object depth of the parent of the JSON object a JSON value with type discarded parse_event_t::key the parser read a key of a value in an object depth of the currently parsed JSON object a JSON string containing the key parse_event_t::object_end the parser read } and finished processing a JSON object depth of the parent of the JSON object the parsed JSON object parse_event_t::array_start the parser read [ and started to process a JSON array depth of the parent of the JSON array a JSON value with type discarded parse_event_t::array_end the parser read ] and finished processing a JSON array depth of the parent of the JSON array the parsed JSON array parse_event_t::value the parser finished reading a JSON value depth of the value the parsed JSON value

    Discarding a value (i.e., returning false) has different effects depending on the context in which function was called:

    • Discarded values in structured types are skipped. That is, the parser will behave as if the discarded value was never read.
    • In case a value outside a structured type is skipped, it is replaced with null. This case happens if the top-level element is skipped.
    "},{"location":"api/basic_json/parser_callback_t/#parameters","title":"Parameters","text":"depth (in) the depth of the recursion during parsing event (in) an event of type parse_event_t indicating the context in the callback function has been called parsed (in, out) the current intermediate parse result; note that writing to this value has no effect for parse_event_t::key events"},{"location":"api/basic_json/parser_callback_t/#return-value","title":"Return value","text":"

    Whether the JSON value which called the function during parsing should be kept (true) or not (false). In the latter case, it is either skipped completely or replaced by an empty discarded object.

    "},{"location":"api/basic_json/parser_callback_t/#examples","title":"Examples","text":"Example

    The example below demonstrates the parse() function with and without callback function.

    #include <iostream>\n#include <iomanip>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // a JSON text\n    auto text = R\"(\n    {\n        \"Image\": {\n            \"Width\":  800,\n            \"Height\": 600,\n            \"Title\":  \"View from 15th Floor\",\n            \"Thumbnail\": {\n                \"Url\":    \"http://www.example.com/image/481989943\",\n                \"Height\": 125,\n                \"Width\":  100\n            },\n            \"Animated\" : false,\n            \"IDs\": [116, 943, 234, 38793]\n        }\n    }\n    )\";\n\n    // parse and serialize JSON\n    json j_complete = json::parse(text);\n    std::cout << std::setw(4) << j_complete << \"\\n\\n\";\n\n    // define parser callback\n    json::parser_callback_t cb = [](int depth, json::parse_event_t event, json & parsed)\n    {\n        // skip object elements with key \"Thumbnail\"\n        if (event == json::parse_event_t::key and parsed == json(\"Thumbnail\"))\n        {\n            return false;\n        }\n        else\n        {\n            return true;\n        }\n    };\n\n    // parse (with callback) and serialize JSON\n    json j_filtered = json::parse(text, cb);\n    std::cout << std::setw(4) << j_filtered << '\\n';\n}\n

    Output:

    {\n    \"Image\": {\n        \"Animated\": false,\n        \"Height\": 600,\n        \"IDs\": [\n            116,\n            943,\n            234,\n            38793\n        ],\n        \"Thumbnail\": {\n            \"Height\": 125,\n            \"Url\": \"http://www.example.com/image/481989943\",\n            \"Width\": 100\n        },\n        \"Title\": \"View from 15th Floor\",\n        \"Width\": 800\n    }\n}\n\n{\n    \"Image\": {\n        \"Animated\": false,\n        \"Height\": 600,\n        \"IDs\": [\n            116,\n            943,\n            234,\n            38793\n        ],\n        \"Title\": \"View from 15th Floor\",\n        \"Width\": 800\n    }\n}\n
    "},{"location":"api/basic_json/parser_callback_t/#version-history","title":"Version history","text":"
    • Added in version 1.0.0.
    "},{"location":"api/basic_json/patch/","title":"nlohmann::basic_json::patch","text":"
    basic_json patch(const basic_json& json_patch) const;\n

    JSON Patch defines a JSON document structure for expressing a sequence of operations to apply to a JSON document. With this function, a JSON Patch is applied to the current JSON value by executing all operations from the patch.

    "},{"location":"api/basic_json/patch/#parameters","title":"Parameters","text":"json_patch (in) JSON patch document"},{"location":"api/basic_json/patch/#return-value","title":"Return value","text":"

    patched document

    "},{"location":"api/basic_json/patch/#exception-safety","title":"Exception safety","text":"

    Strong guarantee: if an exception is thrown, there are no changes in the JSON value.

    "},{"location":"api/basic_json/patch/#exceptions","title":"Exceptions","text":"
    • Throws parse_error.104 if the JSON patch does not consist of an array of objects.
    • Throws parse_error.105 if the JSON patch is malformed (e.g., mandatory attributes are missing); example: \"operation add must have member path\".
    • Throws out_of_range.401 if an array index is out of range.
    • Throws out_of_range.403 if a JSON pointer inside the patch could not be resolved successfully in the current JSON value; example: \"key baz not found\".
    • Throws out_of_range.405 if JSON pointer has no parent (\"add\", \"remove\", \"move\")
    • Throws out_of_range.501 if \"test\" operation was unsuccessful.
    "},{"location":"api/basic_json/patch/#complexity","title":"Complexity","text":"

    Linear in the size of the JSON value and the length of the JSON patch. As usually the patch affects only a fraction of the JSON value, the complexity can usually be neglected.

    "},{"location":"api/basic_json/patch/#notes","title":"Notes","text":"

    The application of a patch is atomic: Either all operations succeed and the patched document is returned or an exception is thrown. In any case, the original value is not changed: the patch is applied to a copy of the value.

    "},{"location":"api/basic_json/patch/#examples","title":"Examples","text":"Example

    The following code shows how a JSON patch is applied to a value.

    #include <iostream>\n#include <iomanip>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\nusing namespace nlohmann::literals;\n\nint main()\n{\n    // the original document\n    json doc = R\"(\n        {\n          \"baz\": \"qux\",\n          \"foo\": \"bar\"\n        }\n    )\"_json;\n\n    // the patch\n    json patch = R\"(\n        [\n          { \"op\": \"replace\", \"path\": \"/baz\", \"value\": \"boo\" },\n          { \"op\": \"add\", \"path\": \"/hello\", \"value\": [\"world\"] },\n          { \"op\": \"remove\", \"path\": \"/foo\"}\n        ]\n    )\"_json;\n\n    // apply the patch\n    json patched_doc = doc.patch(patch);\n\n    // output original and patched document\n    std::cout << std::setw(4) << doc << \"\\n\\n\"\n              << std::setw(4) << patched_doc << std::endl;\n}\n

    Output:

    {\n    \"baz\": \"qux\",\n    \"foo\": \"bar\"\n}\n\n{\n    \"baz\": \"boo\",\n    \"hello\": [\n        \"world\"\n    ]\n}\n
    "},{"location":"api/basic_json/patch/#see-also","title":"See also","text":"
    • RFC 6902 (JSON Patch)
    • RFC 6901 (JSON Pointer)
    • patch_inplace applies a JSON Patch without creating a copy of the document
    • merge_patch applies a JSON Merge Patch
    "},{"location":"api/basic_json/patch/#version-history","title":"Version history","text":"
    • Added in version 2.0.0.
    "},{"location":"api/basic_json/patch_inplace/","title":"nlohmann::basic_json::patch_inplace","text":"
    void patch_inplace(const basic_json& json_patch) const;\n

    JSON Patch defines a JSON document structure for expressing a sequence of operations to apply to a JSON document. With this function, a JSON Patch is applied to the current JSON value by executing all operations from the patch. This function applies a JSON patch in place and returns void.

    "},{"location":"api/basic_json/patch_inplace/#parameters","title":"Parameters","text":"json_patch (in) JSON patch document"},{"location":"api/basic_json/patch_inplace/#exception-safety","title":"Exception safety","text":"

    No guarantees, value may be corrupted by an unsuccessful patch operation.

    "},{"location":"api/basic_json/patch_inplace/#exceptions","title":"Exceptions","text":"
    • Throws parse_error.104 if the JSON patch does not consist of an array of objects.
    • Throws parse_error.105 if the JSON patch is malformed (e.g., mandatory attributes are missing); example: \"operation add must have member path\".
    • Throws out_of_range.401 if an array index is out of range.
    • Throws out_of_range.403 if a JSON pointer inside the patch could not be resolved successfully in the current JSON value; example: \"key baz not found\".
    • Throws out_of_range.405 if JSON pointer has no parent (\"add\", \"remove\", \"move\")
    • Throws out_of_range.501 if \"test\" operation was unsuccessful.
    "},{"location":"api/basic_json/patch_inplace/#complexity","title":"Complexity","text":"

    Linear in the size of the JSON value and the length of the JSON patch. As usually the patch affects only a fraction of the JSON value, the complexity can usually be neglected.

    "},{"location":"api/basic_json/patch_inplace/#notes","title":"Notes","text":"

    Unlike patch, patch_inplace applies the operation \"in place\" and no copy of the JSON value is created. That makes it faster for large documents by avoiding the copy. However, the JSON value might be corrupted if the function throws an exception.

    "},{"location":"api/basic_json/patch_inplace/#examples","title":"Examples","text":"Example

    The following code shows how a JSON patch is applied to a value.

    #include <iostream>\n#include <iomanip>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\nusing namespace nlohmann::literals;\n\nint main()\n{\n    // the original document\n    json doc = R\"(\n        {\n          \"baz\": \"qux\",\n          \"foo\": \"bar\"\n        }\n    )\"_json;\n\n    // the patch\n    json patch = R\"(\n        [\n          { \"op\": \"replace\", \"path\": \"/baz\", \"value\": \"boo\" },\n          { \"op\": \"add\", \"path\": \"/hello\", \"value\": [\"world\"] },\n          { \"op\": \"remove\", \"path\": \"/foo\"}\n        ]\n    )\"_json;\n\n    // output original document\n    std::cout << \"Before\\n\" << std::setw(4) << doc << std::endl;\n\n    // apply the patch\n    doc.patch_inplace(patch);\n\n    // output patched document\n    std::cout << \"\\nAfter\\n\" << std::setw(4) << doc << std::endl;\n}\n

    Output:

    Before\n{\n    \"baz\": \"qux\",\n    \"foo\": \"bar\"\n}\n\nAfter\n{\n    \"baz\": \"boo\",\n    \"hello\": [\n        \"world\"\n    ]\n}\n
    "},{"location":"api/basic_json/patch_inplace/#see-also","title":"See also","text":"
    • RFC 6902 (JSON Patch)
    • RFC 6901 (JSON Pointer)
    • patch applies a JSON Merge Patch
    • merge_patch applies a JSON Merge Patch
    "},{"location":"api/basic_json/patch_inplace/#version-history","title":"Version history","text":"
    • Added in version 3.11.0.
    "},{"location":"api/basic_json/push_back/","title":"nlohmann::basic_json::push_back","text":"
    // (1)\nvoid push_back(basic_json&& val);\nvoid push_back(const basic_json& val);\n\n// (2)\nvoid push_back(const typename object_t::value_type& val);\n\n// (3)\nvoid push_back(initializer_list_t init);\n

    1. Appends the given element val to the end of the JSON array. If the function is called on a JSON null value, an empty array is created before appending val.

    2. Inserts the given element val to the JSON object. If the function is called on a JSON null value, an empty object is created before inserting val.

    3. This function allows using push_back with an initializer list. In case

      1. the current value is an object,
      2. the initializer list init contains only two elements, and
      3. the first element of init is a string,

      init is converted into an object element and added using push_back(const typename object_t::value_type&). Otherwise, init is converted to a JSON value and added using push_back(basic_json&&).

    "},{"location":"api/basic_json/push_back/#iterator-invalidation","title":"Iterator invalidation","text":"

    For all cases where an element is added to an array, a reallocation can happen, in which case all iterators (including the end() iterator) and all references to the elements are invalidated. Otherwise, only the end() iterator is invalidated.

    For ordered_json, also adding an element to an object can yield a reallocation which again invalidates all iterators and all references.

    "},{"location":"api/basic_json/push_back/#parameters","title":"Parameters","text":"val (in) the value to add to the JSON array/object init (in) an initializer list"},{"location":"api/basic_json/push_back/#exceptions","title":"Exceptions","text":"

    All functions can throw the following exception: - Throws type_error.308 when called on a type other than JSON array or null; example: \"cannot use push_back() with number\"

    "},{"location":"api/basic_json/push_back/#complexity","title":"Complexity","text":"
    1. Amortized constant.
    2. Logarithmic in the size of the container, O(log(size())).
    3. Linear in the size of the initializer list init.
    "},{"location":"api/basic_json/push_back/#notes","title":"Notes","text":"

    (3) This function is required to resolve an ambiguous overload error, because pairs like {\"key\", \"value\"} can be both interpreted as object_t::value_type or std::initializer_list<basic_json>, see #235 for more information.

    "},{"location":"api/basic_json/push_back/#examples","title":"Examples","text":"Example: (1) add element to array

    The example shows how push_back() and += can be used to add elements to a JSON array. Note how the null value was silently converted to a JSON array.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // create JSON values\n    json array = {1, 2, 3, 4, 5};\n    json null;\n\n    // print values\n    std::cout << array << '\\n';\n    std::cout << null << '\\n';\n\n    // add values\n    array.push_back(6);\n    array += 7;\n    null += \"first\";\n    null += \"second\";\n\n    // print values\n    std::cout << array << '\\n';\n    std::cout << null << '\\n';\n}\n

    Output:

    [1,2,3,4,5]\nnull\n[1,2,3,4,5,6,7]\n[\"first\",\"second\"]\n
    Example: (2) add element to object

    The example shows how push_back() and += can be used to add elements to a JSON object. Note how the null value was silently converted to a JSON object.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // create JSON values\n    json object = {{\"one\", 1}, {\"two\", 2}};\n    json null;\n\n    // print values\n    std::cout << object << '\\n';\n    std::cout << null << '\\n';\n\n    // add values\n    object.push_back(json::object_t::value_type(\"three\", 3));\n    object += json::object_t::value_type(\"four\", 4);\n    null += json::object_t::value_type(\"A\", \"a\");\n    null += json::object_t::value_type(\"B\", \"b\");\n\n    // print values\n    std::cout << object << '\\n';\n    std::cout << null << '\\n';\n}\n

    Output:

    {\"one\":1,\"two\":2}\nnull\n{\"four\":4,\"one\":1,\"three\":3,\"two\":2}\n{\"A\":\"a\",\"B\":\"b\"}\n
    Example: (3) add to object from initializer list

    The example shows how initializer lists are treated as objects when possible.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // create JSON values\n    json object = {{\"one\", 1}, {\"two\", 2}};\n    json null;\n\n    // print values\n    std::cout << object << '\\n';\n    std::cout << null << '\\n';\n\n    // add values:\n    object.push_back({\"three\", 3});  // object is extended\n    object += {\"four\", 4};           // object is extended\n    null.push_back({\"five\", 5});     // null is converted to array\n\n    // print values\n    std::cout << object << '\\n';\n    std::cout << null << '\\n';\n\n    // would throw:\n    //object.push_back({1, 2, 3});\n}\n

    Output:

    {\"one\":1,\"two\":2}\nnull\n{\"four\":4,\"one\":1,\"three\":3,\"two\":2}\n[[\"five\",5]]\n
    "},{"location":"api/basic_json/push_back/#see-also","title":"See also","text":"
    • emplace_back add a value to an array
    • operator+= add a value to an array/object
    "},{"location":"api/basic_json/push_back/#version-history","title":"Version history","text":"
    1. Since version 1.0.0.
    2. Since version 1.0.0.
    3. Since version 2.0.0.
    "},{"location":"api/basic_json/rbegin/","title":"nlohmann::basic_json::rbegin","text":"
    reverse_iterator rbegin() noexcept;\nconst_reverse_iterator rbegin() const noexcept;\n

    Returns an iterator to the reverse-beginning; that is, the last element.

    "},{"location":"api/basic_json/rbegin/#return-value","title":"Return value","text":"

    reverse iterator to the first element

    "},{"location":"api/basic_json/rbegin/#exception-safety","title":"Exception safety","text":"

    No-throw guarantee: this member function never throws exceptions.

    "},{"location":"api/basic_json/rbegin/#complexity","title":"Complexity","text":"

    Constant.

    "},{"location":"api/basic_json/rbegin/#examples","title":"Examples","text":"Example

    The following code shows an example for rbegin().

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // create an array value\n    json array = {1, 2, 3, 4, 5};\n\n    // get an iterator to the reverse-beginning\n    json::reverse_iterator it = array.rbegin();\n\n    // serialize the element that the iterator points to\n    std::cout << *it << '\\n';\n}\n

    Output:

    5\n
    "},{"location":"api/basic_json/rbegin/#version-history","title":"Version history","text":"
    • Added in version 1.0.0.
    "},{"location":"api/basic_json/rend/","title":"nlohmann::basic_json::rend","text":"
    reverse_iterator rend() noexcept;\nconst_reverse_iterator rend() const noexcept;\n

    Returns an iterator to the reverse-end; that is, one before the first element. This element acts as a placeholder, attempting to access it results in undefined behavior.

    "},{"location":"api/basic_json/rend/#return-value","title":"Return value","text":"

    reverse iterator to the element following the last element

    "},{"location":"api/basic_json/rend/#exception-safety","title":"Exception safety","text":"

    No-throw guarantee: this member function never throws exceptions.

    "},{"location":"api/basic_json/rend/#complexity","title":"Complexity","text":"

    Constant.

    "},{"location":"api/basic_json/rend/#examples","title":"Examples","text":"Example

    The following code shows an example for eend().

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // create an array value\n    json array = {1, 2, 3, 4, 5};\n\n    // get an iterator to the reverse-end\n    json::reverse_iterator it = array.rend();\n\n    // increment the iterator to point to the first element\n    --it;\n\n    // serialize the element that the iterator points to\n    std::cout << *it << '\\n';\n}\n

    Output:

    1\n
    "},{"location":"api/basic_json/rend/#version-history","title":"Version history","text":"
    • Added in version 1.0.0.
    "},{"location":"api/basic_json/sax_parse/","title":"nlohmann::basic_json::sax_parse","text":"
    // (1)\ntemplate <typename InputType, typename SAX>\nstatic bool sax_parse(InputType&& i,\n                      SAX* sax,\n                      input_format_t format = input_format_t::json,\n                      const bool strict = true,\n                      const bool ignore_comments = false,\n                      const bool ignore_trailing_commas = false);\n\n// (2)\ntemplate<class IteratorType, class SAX>\nstatic bool sax_parse(IteratorType first, IteratorType last,\n                      SAX* sax,\n                      input_format_t format = input_format_t::json,\n                      const bool strict = true,\n                      const bool ignore_comments = false,\n                      const bool ignore_trailing_commas = false);\n

    Read from input and generate SAX events

    1. Read from a compatible input.

    2. Read from a pair of character iterators

      The value_type of the iterator must be an integral type with a size of 1, 2, or 4 bytes, which will be interpreted respectively as UTF-8, UTF-16, and UTF-32.

    The SAX event lister must follow the interface of json_sax.

    "},{"location":"api/basic_json/sax_parse/#template-parameters","title":"Template parameters","text":"InputType

    A compatible input, for instance:

    • an std::istream object
    • a FILE pointer
    • a C-style array of characters
    • a pointer to a null-terminated string of single byte characters
    • an object obj for which begin(obj) and end(obj) produces a valid pair of iterators.
    IteratorType Description SAX Description"},{"location":"api/basic_json/sax_parse/#parameters","title":"Parameters","text":"i (in) Input to parse from. sax (in) SAX event listener format (in) the format to parse (JSON, CBOR, MessagePack, or UBJSON) (optional, input_format_t::json by default), see input_format_t for more information strict (in) whether the input has to be consumed completely (optional, true by default) ignore_comments (in) whether comments should be ignored and treated like whitespace (true) or yield a parse error (false); (optional, false by default) ignore_trailing_commas (in) whether trailing commas in arrays or objects should be ignored and treated like whitespace (true) or yield a parse error (false); (optional, false by default) first (in) iterator to the start of a character range last (in) iterator to the end of a character range"},{"location":"api/basic_json/sax_parse/#return-value","title":"Return value","text":"

    return value of the last processed SAX event

    "},{"location":"api/basic_json/sax_parse/#exception-safety","title":"Exception safety","text":""},{"location":"api/basic_json/sax_parse/#complexity","title":"Complexity","text":"

    Linear in the length of the input. The parser is a predictive LL(1) parser. The complexity can be higher if the SAX consumer sax has a super-linear complexity.

    "},{"location":"api/basic_json/sax_parse/#notes","title":"Notes","text":"

    A UTF-8 byte order mark is silently ignored.

    "},{"location":"api/basic_json/sax_parse/#examples","title":"Examples","text":"Example

    The example below demonstrates the sax_parse() function reading from string and processing the events with a user-defined SAX event consumer.

    #include <iostream>\n#include <iomanip>\n#include <sstream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\n// a simple event consumer that collects string representations of the passed\n// values; note inheriting from json::json_sax_t is not required, but can\n// help not to forget a required function\nclass sax_event_consumer : public json::json_sax_t\n{\n  public:\n    std::vector<std::string> events;\n\n    bool null() override\n    {\n        events.push_back(\"null()\");\n        return true;\n    }\n\n    bool boolean(bool val) override\n    {\n        events.push_back(\"boolean(val=\" + std::string(val ? \"true\" : \"false\") + \")\");\n        return true;\n    }\n\n    bool number_integer(number_integer_t val) override\n    {\n        events.push_back(\"number_integer(val=\" + std::to_string(val) + \")\");\n        return true;\n    }\n\n    bool number_unsigned(number_unsigned_t val) override\n    {\n        events.push_back(\"number_unsigned(val=\" + std::to_string(val) + \")\");\n        return true;\n    }\n\n    bool number_float(number_float_t val, const string_t& s) override\n    {\n        events.push_back(\"number_float(val=\" + std::to_string(val) + \", s=\" + s + \")\");\n        return true;\n    }\n\n    bool string(string_t& val) override\n    {\n        events.push_back(\"string(val=\" + val + \")\");\n        return true;\n    }\n\n    bool start_object(std::size_t elements) override\n    {\n        events.push_back(\"start_object(elements=\" + std::to_string(elements) + \")\");\n        return true;\n    }\n\n    bool end_object() override\n    {\n        events.push_back(\"end_object()\");\n        return true;\n    }\n\n    bool start_array(std::size_t elements) override\n    {\n        events.push_back(\"start_array(elements=\" + std::to_string(elements) + \")\");\n        return true;\n    }\n\n    bool end_array() override\n    {\n        events.push_back(\"end_array()\");\n        return true;\n    }\n\n    bool key(string_t& val) override\n    {\n        events.push_back(\"key(val=\" + val + \")\");\n        return true;\n    }\n\n    bool binary(json::binary_t& val) override\n    {\n        events.push_back(\"binary(val=[...])\");\n        return true;\n    }\n\n    bool parse_error(std::size_t position, const std::string& last_token, const json::exception& ex) override\n    {\n        events.push_back(\"parse_error(position=\" + std::to_string(position) + \", last_token=\" + last_token + \",\\n            ex=\" + std::string(ex.what()) + \")\");\n        return false;\n    }\n};\n\nint main()\n{\n    // a JSON text\n    auto text = R\"(\n    {\n        \"Image\": {\n            \"Width\":  800,\n            \"Height\": 600,\n            \"Title\":  \"View from 15th Floor\",\n            \"Thumbnail\": {\n                \"Url\":    \"http://www.example.com/image/481989943\",\n                \"Height\": 125,\n                \"Width\":  100\n            },\n            \"Animated\" : false,\n            \"IDs\": [116, 943, 234, -38793],\n            \"DeletionDate\": null,\n            \"Distance\": 12.723374634\n        }\n    }]\n    )\";\n\n    // create a SAX event consumer object\n    sax_event_consumer sec;\n\n    // parse JSON\n    bool result = json::sax_parse(text, &sec);\n\n    // output the recorded events\n    for (auto& event : sec.events)\n    {\n        std::cout << event << \"\\n\";\n    }\n\n    // output the result of sax_parse\n    std::cout << \"\\nresult: \" << std::boolalpha << result << std::endl;\n}\n

    Output:

    start_object(elements=18446744073709551615)\nkey(val=Image)\nstart_object(elements=18446744073709551615)\nkey(val=Width)\nnumber_unsigned(val=800)\nkey(val=Height)\nnumber_unsigned(val=600)\nkey(val=Title)\nstring(val=View from 15th Floor)\nkey(val=Thumbnail)\nstart_object(elements=18446744073709551615)\nkey(val=Url)\nstring(val=http://www.example.com/image/481989943)\nkey(val=Height)\nnumber_unsigned(val=125)\nkey(val=Width)\nnumber_unsigned(val=100)\nend_object()\nkey(val=Animated)\nboolean(val=false)\nkey(val=IDs)\nstart_array(elements=18446744073709551615)\nnumber_unsigned(val=116)\nnumber_unsigned(val=943)\nnumber_unsigned(val=234)\nnumber_integer(val=-38793)\nend_array()\nkey(val=DeletionDate)\nnull()\nkey(val=Distance)\nnumber_float(val=12.723375, s=12.723374634)\nend_object()\nend_object()\nparse_error(position=460, last_token=12.723374634<U+000A>        }<U+000A>    }],\n            ex=[json.exception.parse_error.101] parse error at line 17, column 6: syntax error while parsing value - unexpected ']'; expected end of input)\n\nresult: false\n
    "},{"location":"api/basic_json/sax_parse/#version-history","title":"Version history","text":"
    • Added in version 3.2.0.
    • Ignoring comments via ignore_comments added in version 3.9.0.
    • Added ignore_trailing_commas in version 3.12.1.

    Deprecation

    Overload (2) replaces calls to sax_parse with a pair of iterators as their first parameter which has been deprecated in version 3.8.0. This overload will be removed in version 4.0.0. Please replace all calls like sax_parse({ptr, ptr+len}); with sax_parse(ptr, ptr+len);.

    "},{"location":"api/basic_json/size/","title":"nlohmann::basic_json::size","text":"
    size_type size() const noexcept;\n

    Returns the number of elements in a JSON value.

    "},{"location":"api/basic_json/size/#return-value","title":"Return value","text":"

    The return value depends on the different types and is defined as follows:

    Value type return value null 0 boolean 1 string 1 number 1 binary 1 object result of function object_t::size() array result of function array_t::size()"},{"location":"api/basic_json/size/#exception-safety","title":"Exception safety","text":"

    No-throw guarantee: this function never throws exceptions.

    "},{"location":"api/basic_json/size/#complexity","title":"Complexity","text":"

    Constant, as long as array_t and object_t satisfy the Container concept; that is, their size() functions have constant complexity.

    "},{"location":"api/basic_json/size/#notes","title":"Notes","text":"

    This function does not return the length of a string stored as JSON value -- it returns the number of elements in the JSON value which is 1 in the case of a string.

    "},{"location":"api/basic_json/size/#examples","title":"Examples","text":"Example

    The following code calls size() on the different value types.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // create JSON values\n    json j_null;\n    json j_boolean = true;\n    json j_number_integer = 17;\n    json j_number_float = 23.42;\n    json j_object = {{\"one\", 1}, {\"two\", 2}};\n    json j_object_empty(json::value_t::object);\n    json j_array = {1, 2, 4, 8, 16};\n    json j_array_empty(json::value_t::array);\n    json j_string = \"Hello, world\";\n\n    // call size()\n    std::cout << j_null.size() << '\\n';\n    std::cout << j_boolean.size() << '\\n';\n    std::cout << j_number_integer.size() << '\\n';\n    std::cout << j_number_float.size() << '\\n';\n    std::cout << j_object.size() << '\\n';\n    std::cout << j_object_empty.size() << '\\n';\n    std::cout << j_array.size() << '\\n';\n    std::cout << j_array_empty.size() << '\\n';\n    std::cout << j_string.size() << '\\n';\n}\n

    Output:

    0\n1\n1\n1\n2\n0\n5\n0\n1\n
    "},{"location":"api/basic_json/size/#version-history","title":"Version history","text":"
    • Added in version 1.0.0.
    • Extended to return 1 for binary types in version 3.8.0.
    "},{"location":"api/basic_json/start_pos/","title":"nlohmann::basic_json::start_pos","text":"
    #if JSON_DIAGNOSTIC_POSITIONS\nconstexpr std::size_t start_pos() const noexcept;\n#endif\n

    Returns the position of the first character in the JSON string from which the value was parsed from.

    JSON type return value object position of the opening { array position of the opening [ string position of the opening \" number position of the first character boolean position of t for true and f for false null position of n"},{"location":"api/basic_json/start_pos/#return-value","title":"Return value","text":"

    the position of the first character of the value in the parsed JSON string, if the value was created by the parse function, or std::string::npos if the value was constructed otherwise

    "},{"location":"api/basic_json/start_pos/#exception-safety","title":"Exception safety","text":"

    No-throw guarantee: this member function never throws exceptions.

    "},{"location":"api/basic_json/start_pos/#complexity","title":"Complexity","text":"

    Constant.

    "},{"location":"api/basic_json/start_pos/#notes","title":"Notes","text":"

    Note

    The function is only available if macro JSON_DIAGNOSTIC_POSITIONS has been defined to 1 before including the library header.

    Invalidation

    The returned positions are only valid as long as the JSON value is not changed. The positions are not updated when the JSON value is changed.

    "},{"location":"api/basic_json/start_pos/#examples","title":"Examples","text":"Example 
    #include <iostream>\n\n#define JSON_DIAGNOSTIC_POSITIONS 1\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    std::string json_string = R\"(\n    {\n        \"address\": {\n            \"street\": \"Fake Street\",\n            \"housenumber\": 1\n        }\n    }\n    )\";\n    json j = json::parse(json_string);\n\n    std::cout << \"Root diagnostic positions: \\n\";\n    std::cout << \"\\tstart_pos: \" << j.start_pos() << '\\n';\n    std::cout << \"\\tend_pos:\" << j.end_pos() << \"\\n\";\n    std::cout << \"Original string: \\n\";\n    std::cout << \"{\\n        \\\"address\\\": {\\n            \\\"street\\\": \\\"Fake Street\\\",\\n            \\\"housenumber\\\": 1\\n        }\\n    }\" << \"\\n\";\n    std::cout << \"Parsed string: \\n\";\n    std::cout << json_string.substr(j.start_pos(), j.end_pos() - j.start_pos()) << \"\\n\\n\";\n\n    std::cout << \"address diagnostic positions: \\n\";\n    std::cout << \"\\tstart_pos:\" << j[\"address\"].start_pos() << '\\n';\n    std::cout << \"\\tend_pos:\" << j[\"address\"].end_pos() << \"\\n\\n\";\n    std::cout << \"Original string: \\n\";\n    std::cout << \"{            \\\"street\\\": \\\"Fake Street\\\",\\n            \\\"housenumber\\\": 1\\n        }\" << \"\\n\";\n    std::cout << \"Parsed string: \\n\";\n    std::cout << json_string.substr(j[\"address\"].start_pos(), j[\"address\"].end_pos() - j[\"address\"].start_pos()) << \"\\n\\n\";\n\n    std::cout << \"street diagnostic positions: \\n\";\n    std::cout << \"\\tstart_pos:\" << j[\"address\"][\"street\"].start_pos() << '\\n';\n    std::cout << \"\\tend_pos:\" << j[\"address\"][\"street\"].end_pos() << \"\\n\\n\";\n    std::cout << \"Original string: \\n\";\n    std::cout << \"\\\"Fake Street\\\"\" << \"\\n\";\n    std::cout << \"Parsed string: \\n\";\n    std::cout << json_string.substr(j[\"address\"][\"street\"].start_pos(), j[\"address\"][\"street\"].end_pos() - j[\"address\"][\"street\"].start_pos()) << \"\\n\\n\";\n\n    std::cout << \"housenumber diagnostic positions: \\n\";\n    std::cout << \"\\tstart_pos:\" << j[\"address\"][\"housenumber\"].start_pos() << '\\n';\n    std::cout << \"\\tend_pos:\" << j[\"address\"][\"housenumber\"].end_pos() << \"\\n\\n\";\n    std::cout << \"Original string: \\n\";\n    std::cout << \"1\" << \"\\n\";\n    std::cout << \"Parsed string: \\n\";\n    std::cout << json_string.substr(j[\"address\"][\"housenumber\"].start_pos(), j[\"address\"][\"housenumber\"].end_pos() - j[\"address\"][\"housenumber\"].start_pos()) << \"\\n\\n\";\n}\n

    Output:

    Root diagnostic positions: \n    start_pos: 5\n    end_pos:109\nOriginal string: \n{\n        \"address\": {\n            \"street\": \"Fake Street\",\n            \"housenumber\": 1\n        }\n    }\nParsed string: \n{\n        \"address\": {\n            \"street\": \"Fake Street\",\n            \"housenumber\": 1\n        }\n    }\n\naddress diagnostic positions: \n    start_pos:26\n    end_pos:103\n\nOriginal string: \n{            \"street\": \"Fake Street\",\n            \"housenumber\": 1\n        }\nParsed string: \n{\n            \"street\": \"Fake Street\",\n            \"housenumber\": 1\n        }\n\nstreet diagnostic positions: \n    start_pos:50\n    end_pos:63\n\nOriginal string: \n\"Fake Street\"\nParsed string: \n\"Fake Street\"\n\nhousenumber diagnostic positions: \n    start_pos:92\n    end_pos:93\n\nOriginal string: \n1\nParsed string: \n1\n

    The output shows the start/end positions of all the objects and fields in the JSON string.

    "},{"location":"api/basic_json/start_pos/#see-also","title":"See also","text":"
    • end_pos to access the end position
    • JSON_DIAGNOSTIC_POSITIONS for an overview of the diagnostic positions
    "},{"location":"api/basic_json/start_pos/#version-history","title":"Version history","text":"
    • Added in version 3.12.0.
    "},{"location":"api/basic_json/std_hash/","title":"std::hash<nlohmann::basic_json>","text":"
    namespace std {\n    struct hash<nlohmann::basic_json>;\n}\n

    Return a hash value for a JSON object. The hash function tries to rely on std::hash where possible. Furthermore, the type of the JSON value is taken into account to have different hash values for null, 0, 0U, and false, etc.

    "},{"location":"api/basic_json/std_hash/#examples","title":"Examples","text":"Example

    The example shows how to calculate hash values for different JSON values.

    #include <iostream>\n#include <iomanip>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\nusing namespace nlohmann::literals;\n\nint main()\n{\n    std::cout << \"hash(null) = \" << std::hash<json> {}(json(nullptr)) << '\\n'\n              << \"hash(false) = \" << std::hash<json> {}(json(false)) << '\\n'\n              << \"hash(0) = \" << std::hash<json> {}(json(0)) << '\\n'\n              << \"hash(0U) = \" << std::hash<json> {}(json(0U)) << '\\n'\n              << \"hash(\\\"\\\") = \" << std::hash<json> {}(json(\"\")) << '\\n'\n              << \"hash({}) = \" << std::hash<json> {}(json::object()) << '\\n'\n              << \"hash([]) = \" << std::hash<json> {}(json::array()) << '\\n'\n              << \"hash({\\\"hello\\\": \\\"world\\\"}) = \" << std::hash<json> {}(\"{\\\"hello\\\": \\\"world\\\"}\"_json)\n              << std::endl;\n}\n

    Output:

    hash(null) = 2654435769\nhash(false) = 2654436030\nhash(0) = 2654436095\nhash(0U) = 2654436156\nhash(\"\") = 6142509191626859748\nhash({}) = 2654435832\nhash([]) = 2654435899\nhash({\"hello\": \"world\"}) = 4469488738203676328\n

    Note the output is platform-dependent.

    "},{"location":"api/basic_json/std_hash/#version-history","title":"Version history","text":"
    • Added in version 1.0.0.
    • Extended for arbitrary basic_json types in version 3.10.5.
    "},{"location":"api/basic_json/std_swap/","title":"std::swap<basic_json>","text":"
    namespace std {\n    void swap(nlohmann::basic_json& j1, nlohmann::basic_json& j2);\n}\n

    Exchanges the values of two JSON objects.

    "},{"location":"api/basic_json/std_swap/#parameters","title":"Parameters","text":"j1 (in, out) value to be replaced by j2 j2 (in, out) value to be replaced by j1"},{"location":"api/basic_json/std_swap/#possible-implementation","title":"Possible implementation","text":"
    void swap(nlohmann::basic_json& j1, nlohmann::basic_json& j2)\n{\n    j1.swap(j2);\n}\n
    "},{"location":"api/basic_json/std_swap/#examples","title":"Examples","text":"Example

    The following code shows how two values are swapped with std::swap.

    #include <iostream>\n#include <iomanip>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // create JSON values\n    json j1 = {{\"one\", 1}, {\"two\", 2}};\n    json j2 = {1, 2, 4, 8, 16};\n\n    std::cout << \"j1 = \" << j1 << \" | j2 = \" << j2 << '\\n';\n\n    // swap values\n    std::swap(j1, j2);\n\n    std::cout << \"j1 = \" << j1 << \" | j2 = \" << j2 << std::endl;\n}\n

    Output:

    j1 = {\"one\":1,\"two\":2} | j2 = [1,2,4,8,16]\nj1 = [1,2,4,8,16] | j2 = {\"one\":1,\"two\":2}\n
    "},{"location":"api/basic_json/std_swap/#see-also","title":"See also","text":"
    • swap
    "},{"location":"api/basic_json/std_swap/#version-history","title":"Version history","text":"
    • Added in version 1.0.0.
    • Extended for arbitrary basic_json types in version 3.10.5.
    "},{"location":"api/basic_json/string_t/","title":"nlohmann::basic_json::string_t","text":"
    using string_t = StringType;\n

    The type used to store JSON strings.

    RFC 8259 describes JSON strings as follows:

    A string is a sequence of zero or more Unicode characters.

    To store objects in C++, a type is defined by the template parameter described below. Unicode values are split by the JSON class into byte-sized characters during deserialization.

    "},{"location":"api/basic_json/string_t/#template-parameters","title":"Template parameters","text":"StringType the container to store strings (e.g., std::string). Note this container is used for keys/names in objects, see object_t."},{"location":"api/basic_json/string_t/#notes","title":"Notes","text":""},{"location":"api/basic_json/string_t/#default-type","title":"Default type","text":"

    With the default values for StringType (std::string), the default value for string_t is std::string.

    "},{"location":"api/basic_json/string_t/#encoding","title":"Encoding","text":"

    Strings are stored in UTF-8 encoding. Therefore, functions like std::string::size() or std::string::length() return the number of bytes in the string rather than the number of characters or glyphs.

    "},{"location":"api/basic_json/string_t/#string-comparison","title":"String comparison","text":"

    RFC 8259 states:

    Software implementations are typically required to test names of object members for equality. Implementations that transform the textual representation into sequences of Unicode code units and then perform the comparison numerically, code unit by code unit, are interoperable in the sense that implementations will agree in all cases on equality or inequality of two strings. For example, implementations that compare strings with escaped characters unconverted may incorrectly find that \"a\\\\b\" and \"a\\u005Cb\" are not equal.

    This implementation is interoperable as it does compare strings code unit by code unit.

    "},{"location":"api/basic_json/string_t/#storage","title":"Storage","text":"

    String values are stored as pointers in a basic_json type. That is, for any access to string values, a pointer of type string_t* must be dereferenced.

    "},{"location":"api/basic_json/string_t/#examples","title":"Examples","text":"Example

    The following code shows that string_t is by default, a typedef to std::string.

    #include <iostream>\n#include <iomanip>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    std::cout << std::boolalpha << std::is_same<std::string, json::string_t>::value << std::endl;\n}\n

    Output:

    true\n
    "},{"location":"api/basic_json/string_t/#version-history","title":"Version history","text":"
    • Added in version 1.0.0.
    "},{"location":"api/basic_json/swap/","title":"nlohmann::basic_json::swap","text":"
    // (1)\nvoid swap(reference other) noexcept;\n\n// (2)\nvoid swap(reference left, reference right) noexcept;\n\n// (3)\nvoid swap(array_t& other);\n\n// (4)\nvoid swap(object_t& other);\n\n// (5)\nvoid swap(string_t& other);\n\n// (6)\nvoid swap(binary_t& other);\n\n// (7)\nvoid swap(typename binary_t::container_type& other);\n
    1. Exchanges the contents of the JSON value with those of other. Does not invoke any move, copy, or swap operations on individual elements. All iterators and references remain valid. The past-the-end iterator is invalidated.
    2. Exchanges the contents of the JSON value from left with those of right. Does not invoke any move, copy, or swap operations on individual elements. All iterators and references remain valid. The past-the-end iterator is invalidated. Implemented as a friend function callable via ADL.
    3. Exchanges the contents of a JSON array with those of other. Does not invoke any move, copy, or swap operations on individual elements. All iterators and references remain valid. The past-the-end iterator is invalidated.
    4. Exchanges the contents of a JSON object with those of other. Does not invoke any move, copy, or swap operations on individual elements. All iterators and references remain valid. The past-the-end iterator is invalidated.
    5. Exchanges the contents of a JSON string with those of other. Does not invoke any move, copy, or swap operations on individual elements. All iterators and references remain valid. The past-the-end iterator is invalidated.
    6. Exchanges the contents of a binary value with those of other. Does not invoke any move, copy, or swap operations on individual elements. All iterators and references remain valid. The past-the-end iterator is invalidated.
    7. Exchanges the contents of a binary value with those of other. Does not invoke any move, copy, or swap operations on individual elements. All iterators and references remain valid. The past-the-end iterator is invalidated. Unlike version (6), no binary subtype is involved.
    "},{"location":"api/basic_json/swap/#parameters","title":"Parameters","text":"other (in, out) value to exchange the contents with left (in, out) value to exchange the contents with right (in, out) value to exchange the contents with"},{"location":"api/basic_json/swap/#exceptions","title":"Exceptions","text":"
    1. No-throw guarantee: this function never throws exceptions.
    2. No-throw guarantee: this function never throws exceptions.
    3. Throws type_error.310 if called on JSON values other than arrays; example: \"cannot use swap() with boolean\"
    4. Throws type_error.310 if called on JSON values other than objects; example: \"cannot use swap() with boolean\"
    5. Throws type_error.310 if called on JSON values other than strings; example: \"cannot use swap() with boolean\"
    6. Throws type_error.310 if called on JSON values other than binaries; example: \"cannot use swap() with boolean\"
    7. Throws type_error.310 if called on JSON values other than binaries; example: \"cannot use swap() with boolean\"
    "},{"location":"api/basic_json/swap/#complexity","title":"Complexity","text":"

    Constant.

    "},{"location":"api/basic_json/swap/#examples","title":"Examples","text":"Example: Swap JSON value (1, 2)

    The example below shows how JSON values can be swapped with swap().

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // create two JSON values\n    json j1 = {1, 2, 3, 4, 5};\n    json j2 = {{\"pi\", 3.141592653589793}, {\"e\", 2.718281828459045}};\n\n    // swap the values\n    j1.swap(j2);\n\n    // output the values\n    std::cout << \"j1 = \" << j1 << '\\n';\n    std::cout << \"j2 = \" << j2 << '\\n';\n}\n

    Output:

    j1 = {\"e\":2.718281828459045,\"pi\":3.141592653589793}\nj2 = [1,2,3,4,5]\n
    Example: Swap array (3)

    The example below shows how arrays can be swapped with swap().

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // create a JSON value\n    json value = {{\"array\", {1, 2, 3, 4}}};\n\n    // create an array_t\n    json::array_t array = {\"Snap\", \"Crackle\", \"Pop\"};\n\n    // swap the array stored in the JSON value\n    value[\"array\"].swap(array);\n\n    // output the values\n    std::cout << \"value = \" << value << '\\n';\n    std::cout << \"array = \" << array << '\\n';\n}\n

    Output:

    value = {\"array\":[\"Snap\",\"Crackle\",\"Pop\"]}\narray = [1,2,3,4]\n
    Example: Swap object (4)

    The example below shows how objects can be swapped with swap().

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // create a JSON value\n    json value = { {\"translation\", {{\"one\", \"eins\"}, {\"two\", \"zwei\"}}} };\n\n    // create an object_t\n    json::object_t object = {{\"cow\", \"Kuh\"}, {\"dog\", \"Hund\"}};\n\n    // swap the object stored in the JSON value\n    value[\"translation\"].swap(object);\n\n    // output the values\n    std::cout << \"value = \" << value << '\\n';\n    std::cout << \"object = \" << object << '\\n';\n}\n

    Output:

    value = {\"translation\":{\"cow\":\"Kuh\",\"dog\":\"Hund\"}}\nobject = {\"one\":\"eins\",\"two\":\"zwei\"}\n
    Example: Swap string (5)

    The example below shows how strings can be swapped with swap().

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // create a JSON value\n    json value = { \"the good\", \"the bad\", \"the ugly\" };\n\n    // create string_t\n    json::string_t string = \"the fast\";\n\n    // swap the object stored in the JSON value\n    value[1].swap(string);\n\n    // output the values\n    std::cout << \"value = \" << value << '\\n';\n    std::cout << \"string = \" << string << '\\n';\n}\n

    Output:

    value = [\"the good\",\"the fast\",\"the ugly\"]\nstring = the bad\n
    Example: Swap string (6)

    The example below shows how binary values can be swapped with swap().

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // create a binary value\n    json value = json::binary({1, 2, 3});\n\n    // create a binary_t\n    json::binary_t binary = {{4, 5, 6}};\n\n    // swap the object stored in the JSON value\n    value.swap(binary);\n\n    // output the values\n    std::cout << \"value = \" << value << '\\n';\n    std::cout << \"binary = \" << json(binary) << '\\n';\n}\n

    Output:

    value = {\"bytes\":[4,5,6],\"subtype\":null}\nbinary = {\"bytes\":[1,2,3],\"subtype\":null}\n
    "},{"location":"api/basic_json/swap/#see-also","title":"See also","text":"
    • std::swap<basic_json>
    "},{"location":"api/basic_json/swap/#version-history","title":"Version history","text":"
    1. Since version 1.0.0.
    2. Since version 1.0.0.
    3. Since version 1.0.0.
    4. Since version 1.0.0.
    5. Since version 1.0.0.
    6. Since version 3.8.0.
    7. Since version 3.8.0.
    "},{"location":"api/basic_json/to_bjdata/","title":"nlohmann::basic_json::to_bjdata","text":"
    // (1)\nstatic std::vector<std::uint8_t> to_bjdata(const basic_json& j,\n                                           const bool use_size = false,\n                                           const bool use_type = false,\n                                           const bjdata_version_t version = bjdata_version_t::draft2);\n\n// (2)\nstatic void to_bjdata(const basic_json& j, detail::output_adapter<std::uint8_t> o,\n                      const bool use_size = false, const bool use_type = false,\n                      const bjdata_version_t version = bjdata_version_t::draft2);\nstatic void to_bjdata(const basic_json& j, detail::output_adapter<char> o,\n                      const bool use_size = false, const bool use_type = false,\n                      const bjdata_version_t version = bjdata_version_t::draft2);\n

    Serializes a given JSON value j to a byte vector using the BJData (Binary JData) serialization format. BJData aims to be more compact than JSON itself, yet more efficient to parse.

    1. Returns a byte vector containing the BJData serialization.
    2. Writes the BJData serialization to an output adapter.

    The exact mapping and its limitations are described on a dedicated page.

    "},{"location":"api/basic_json/to_bjdata/#parameters","title":"Parameters","text":"j (in) JSON value to serialize o (in) output adapter to write serialization to use_size (in) whether to add size annotations to container types; optional, false by default. use_type (in) whether to add type annotations to container types (must be combined with use_size = true); optional, false by default. version (in) which version of BJData to use (see note on \"Binary values\" on BJData); optional, bjdata_version_t::draft2 by default."},{"location":"api/basic_json/to_bjdata/#return-value","title":"Return value","text":"
    1. BJData serialization as byte vector
    2. (none)
    "},{"location":"api/basic_json/to_bjdata/#exception-safety","title":"Exception safety","text":"

    Strong guarantee: if an exception is thrown, there are no changes in the JSON value.

    "},{"location":"api/basic_json/to_bjdata/#complexity","title":"Complexity","text":"

    Linear in the size of the JSON value j.

    "},{"location":"api/basic_json/to_bjdata/#examples","title":"Examples","text":"Example

    The example shows the serialization of a JSON value to a byte vector in BJData format.

    #include <iostream>\n#include <iomanip>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\nusing namespace nlohmann::literals;\n\n// function to print BJData's diagnostic format\nvoid print_byte(uint8_t byte)\n{\n    if (32 < byte and byte < 128)\n    {\n        std::cout << (char)byte;\n    }\n    else\n    {\n        std::cout << (int)byte;\n    }\n}\n\nint main()\n{\n    // create a JSON value\n    json j = R\"({\"compact\": true, \"schema\": false})\"_json;\n\n    // serialize it to BJData\n    std::vector<std::uint8_t> v = json::to_bjdata(j);\n\n    // print the vector content\n    for (auto& byte : v)\n    {\n        print_byte(byte);\n    }\n    std::cout << std::endl;\n\n    // create an array of numbers\n    json array = {1, 2, 3, 4, 5, 6, 7, 8};\n\n    // serialize it to BJData using default representation\n    std::vector<std::uint8_t> v_array = json::to_bjdata(array);\n    // serialize it to BJData using size optimization\n    std::vector<std::uint8_t> v_array_size = json::to_bjdata(array, true);\n    // serialize it to BJData using type optimization\n    std::vector<std::uint8_t> v_array_size_and_type = json::to_bjdata(array, true, true);\n\n    // print the vector contents\n    for (auto& byte : v_array)\n    {\n        print_byte(byte);\n    }\n    std::cout << std::endl;\n\n    for (auto& byte : v_array_size)\n    {\n        print_byte(byte);\n    }\n    std::cout << std::endl;\n\n    for (auto& byte : v_array_size_and_type)\n    {\n        print_byte(byte);\n    }\n    std::cout << std::endl;\n}\n

    Output:

    {i7compactTi6schemaF}\n[i1i2i3i4i5i6i7i8]\n[#i8i1i2i3i4i5i6i7i8\n[$i#i812345678\n
    "},{"location":"api/basic_json/to_bjdata/#version-history","title":"Version history","text":"
    • Added in version 3.11.0.
    • BJData version parameter (for draft3 binary encoding) added in version 3.12.0.
    "},{"location":"api/basic_json/to_bson/","title":"nlohmann::basic_json::to_bson","text":"
    // (1)\nstatic std::vector<std::uint8_t> to_bson(const basic_json& j);\n\n// (2)\nstatic void to_bson(const basic_json& j, detail::output_adapter<std::uint8_t> o);\nstatic void to_bson(const basic_json& j, detail::output_adapter<char> o);\n

    BSON (Binary JSON) is a binary format in which zero or more ordered key/value pairs are stored as a single entity (a so-called document).

    1. Returns a byte vector containing the BSON serialization.
    2. Writes the BSON serialization to an output adapter.

    The exact mapping and its limitations are described on a dedicated page.

    "},{"location":"api/basic_json/to_bson/#parameters","title":"Parameters","text":"j (in) JSON value to serialize o (in) output adapter to write serialization to"},{"location":"api/basic_json/to_bson/#return-value","title":"Return value","text":"
    1. BSON serialization as a byte vector
    2. (none)
    "},{"location":"api/basic_json/to_bson/#exception-safety","title":"Exception safety","text":"

    Strong guarantee: if an exception is thrown, there are no changes in the JSON value.

    "},{"location":"api/basic_json/to_bson/#complexity","title":"Complexity","text":"

    Linear in the size of the JSON value j.

    "},{"location":"api/basic_json/to_bson/#examples","title":"Examples","text":"Example

    The example shows the serialization of a JSON value to a byte vector in BSON format.

    #include <iostream>\n#include <iomanip>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\nusing namespace nlohmann::literals;\n\nint main()\n{\n    // create a JSON value\n    json j = R\"({\"compact\": true, \"schema\": 0})\"_json;\n\n    // serialize it to BSON\n    std::vector<std::uint8_t> v = json::to_bson(j);\n\n    // print the vector content\n    for (auto& byte : v)\n    {\n        std::cout << \"0x\" << std::hex << std::setw(2) << std::setfill('0') << (int)byte << \" \";\n    }\n    std::cout << std::endl;\n}\n

    Output:

    0x1b 0x00 0x00 0x00 0x08 0x63 0x6f 0x6d 0x70 0x61 0x63 0x74 0x00 0x01 0x10 0x73 0x63 0x68 0x65 0x6d 0x61 0x00 0x00 0x00 0x00 0x00 0x00 \n
    "},{"location":"api/basic_json/to_bson/#version-history","title":"Version history","text":"
    • Added in version 3.4.0.
    "},{"location":"api/basic_json/to_cbor/","title":"nlohmann::basic_json::to_cbor","text":"
    // (1)\nstatic std::vector<std::uint8_t> to_cbor(const basic_json& j);\n\n// (2)\nstatic void to_cbor(const basic_json& j, detail::output_adapter<std::uint8_t> o);\nstatic void to_cbor(const basic_json& j, detail::output_adapter<char> o);\n

    Serializes a given JSON value j to a byte vector using the CBOR (Concise Binary Object Representation) serialization format. CBOR is a binary serialization format that aims to be more compact than JSON itself, yet more efficient to parse.

    1. Returns a byte vector containing the CBOR serialization.
    2. Writes the CBOR serialization to an output adapter.

    The exact mapping and its limitations are described on a dedicated page.

    "},{"location":"api/basic_json/to_cbor/#parameters","title":"Parameters","text":"j (in) JSON value to serialize o (in) output adapter to write serialization to"},{"location":"api/basic_json/to_cbor/#return-value","title":"Return value","text":"
    1. CBOR serialization as a byte vector
    2. (none)
    "},{"location":"api/basic_json/to_cbor/#exception-safety","title":"Exception safety","text":"

    Strong guarantee: if an exception is thrown, there are no changes in the JSON value.

    "},{"location":"api/basic_json/to_cbor/#complexity","title":"Complexity","text":"

    Linear in the size of the JSON value j.

    "},{"location":"api/basic_json/to_cbor/#examples","title":"Examples","text":"Example

    The example shows the serialization of a JSON value to a byte vector in CBOR format.

    #include <iostream>\n#include <iomanip>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\nusing namespace nlohmann::literals;\n\nint main()\n{\n    // create a JSON value\n    json j = R\"({\"compact\": true, \"schema\": 0})\"_json;\n\n    // serialize it to CBOR\n    std::vector<std::uint8_t> v = json::to_cbor(j);\n\n    // print the vector content\n    for (auto& byte : v)\n    {\n        std::cout << \"0x\" << std::hex << std::setw(2) << std::setfill('0') << (int)byte << \" \";\n    }\n    std::cout << std::endl;\n}\n

    Output:

    0xa2 0x67 0x63 0x6f 0x6d 0x70 0x61 0x63 0x74 0xf5 0x66 0x73 0x63 0x68 0x65 0x6d 0x61 0x00 \n
    "},{"location":"api/basic_json/to_cbor/#version-history","title":"Version history","text":"
    • Added in version 2.0.9.
    • Compact representation of floating-point numbers added in version 3.8.0.
    "},{"location":"api/basic_json/to_msgpack/","title":"nlohmann::basic_json::to_msgpack","text":"
    // (1)\nstatic std::vector<std::uint8_t> to_msgpack(const basic_json& j);\n\n// (2)\nstatic void to_msgpack(const basic_json& j, detail::output_adapter<std::uint8_t> o);\nstatic void to_msgpack(const basic_json& j, detail::output_adapter<char> o);\n

    Serializes a given JSON value j to a byte vector using the MessagePack serialization format. MessagePack is a binary serialization format that aims to be more compact than JSON itself, yet more efficient to parse.

    1. Returns a byte vector containing the MessagePack serialization.
    2. Writes the MessagePack serialization to an output adapter.

    The exact mapping and its limitations are described on a dedicated page.

    "},{"location":"api/basic_json/to_msgpack/#parameters","title":"Parameters","text":"j (in) JSON value to serialize o (in) output adapter to write serialization to"},{"location":"api/basic_json/to_msgpack/#return-value","title":"Return value","text":"
    1. MessagePack serialization as a byte vector
    2. (none)
    "},{"location":"api/basic_json/to_msgpack/#exception-safety","title":"Exception safety","text":"

    Strong guarantee: if an exception is thrown, there are no changes in the JSON value.

    "},{"location":"api/basic_json/to_msgpack/#complexity","title":"Complexity","text":"

    Linear in the size of the JSON value j.

    "},{"location":"api/basic_json/to_msgpack/#examples","title":"Examples","text":"Example

    The example shows the serialization of a JSON value to a byte vector in MessagePack format.

    #include <iostream>\n#include <iomanip>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\nusing namespace nlohmann::literals;\n\nint main()\n{\n    // create a JSON value\n    json j = R\"({\"compact\": true, \"schema\": 0})\"_json;\n\n    // serialize it to MessagePack\n    std::vector<std::uint8_t> v = json::to_msgpack(j);\n\n    // print the vector content\n    for (auto& byte : v)\n    {\n        std::cout << \"0x\" << std::hex << std::setw(2) << std::setfill('0') << (int)byte << \" \";\n    }\n    std::cout << std::endl;\n}\n

    Output:

    0x82 0xa7 0x63 0x6f 0x6d 0x70 0x61 0x63 0x74 0xc3 0xa6 0x73 0x63 0x68 0x65 0x6d 0x61 0x00 \n
    "},{"location":"api/basic_json/to_msgpack/#version-history","title":"Version history","text":"
    • Added in version 2.0.9.
    "},{"location":"api/basic_json/to_string/","title":"to_string(basic_json)","text":"
    template <typename BasicJsonType>\nstd::string to_string(const BasicJsonType& j);\n

    This function implements a user-defined to_string for JSON objects.

    "},{"location":"api/basic_json/to_string/#template-parameters","title":"Template parameters","text":"BasicJsonType a specialization of basic_json"},{"location":"api/basic_json/to_string/#return-value","title":"Return value","text":"

    string containing the serialization of the JSON value

    "},{"location":"api/basic_json/to_string/#exception-safety","title":"Exception safety","text":"

    Strong guarantee: if an exception is thrown, there are no changes to any JSON value.

    "},{"location":"api/basic_json/to_string/#exceptions","title":"Exceptions","text":"

    Throws type_error.316 if a string stored inside the JSON value is not UTF-8 encoded

    "},{"location":"api/basic_json/to_string/#complexity","title":"Complexity","text":"

    Linear.

    "},{"location":"api/basic_json/to_string/#possible-implementation","title":"Possible implementation","text":"
    template <typename BasicJsonType>\nstd::string to_string(const BasicJsonType& j)\n{\n    return j.dump();\n}\n
    "},{"location":"api/basic_json/to_string/#examples","title":"Examples","text":"Example

    The following code shows how the library's to_string() function integrates with others, allowing argument-dependent lookup.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\nusing std::to_string;\n\nint main()\n{\n    // create values\n    json j = {{\"one\", 1}, {\"two\", 2}};\n    int i = 42;\n\n    // use ADL to select best to_string function\n    auto j_str = to_string(j);  // calling nlohmann::to_string\n    auto i_str = to_string(i);  // calling std::to_string\n\n    // serialize without indentation\n    std::cout << j_str << \"\\n\\n\"\n              << i_str << std::endl;\n}\n

    Output:

    {\"one\":1,\"two\":2}\n\n42\n
    "},{"location":"api/basic_json/to_string/#see-also","title":"See also","text":"
    • dump
    "},{"location":"api/basic_json/to_string/#version-history","title":"Version history","text":"

    Added in version 3.7.0.

    "},{"location":"api/basic_json/to_ubjson/","title":"nlohmann::basic_json::to_ubjson","text":"
    // (1)\nstatic std::vector<std::uint8_t> to_ubjson(const basic_json& j,\n                                           const bool use_size = false,\n                                           const bool use_type = false);\n\n// (2)\nstatic void to_ubjson(const basic_json& j, detail::output_adapter<std::uint8_t> o,\n                      const bool use_size = false, const bool use_type = false);\nstatic void to_ubjson(const basic_json& j, detail::output_adapter<char> o,\n                      const bool use_size = false, const bool use_type = false);\n

    Serializes a given JSON value j to a byte vector using the UBJSON (Universal Binary JSON) serialization format. UBJSON aims to be more compact than JSON itself, yet more efficient to parse.

    1. Returns a byte vector containing the UBJSON serialization.
    2. Writes the UBJSON serialization to an output adapter.

    The exact mapping and its limitations are described on a dedicated page.

    "},{"location":"api/basic_json/to_ubjson/#parameters","title":"Parameters","text":"j (in) JSON value to serialize o (in) output adapter to write serialization to use_size (in) whether to add size annotations to container types; optional, false by default. use_type (in) whether to add type annotations to container types (must be combined with use_size = true); optional, false by default."},{"location":"api/basic_json/to_ubjson/#return-value","title":"Return value","text":"
    1. UBJSON serialization as a byte vector
    2. (none)
    "},{"location":"api/basic_json/to_ubjson/#exception-safety","title":"Exception safety","text":"

    Strong guarantee: if an exception is thrown, there are no changes in the JSON value.

    "},{"location":"api/basic_json/to_ubjson/#complexity","title":"Complexity","text":"

    Linear in the size of the JSON value j.

    "},{"location":"api/basic_json/to_ubjson/#examples","title":"Examples","text":"Example

    The example shows the serialization of a JSON value to a byte vector in UBJSON format.

    #include <iostream>\n#include <iomanip>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\nusing namespace nlohmann::literals;\n\n// function to print UBJSON's diagnostic format\nvoid print_byte(uint8_t byte)\n{\n    if (32 < byte and byte < 128)\n    {\n        std::cout << (char)byte;\n    }\n    else\n    {\n        std::cout << (int)byte;\n    }\n}\n\nint main()\n{\n    // create a JSON value\n    json j = R\"({\"compact\": true, \"schema\": false})\"_json;\n\n    // serialize it to UBJSON\n    std::vector<std::uint8_t> v = json::to_ubjson(j);\n\n    // print the vector content\n    for (auto& byte : v)\n    {\n        print_byte(byte);\n    }\n    std::cout << std::endl;\n\n    // create an array of numbers\n    json array = {1, 2, 3, 4, 5, 6, 7, 8};\n\n    // serialize it to UBJSON using default representation\n    std::vector<std::uint8_t> v_array = json::to_ubjson(array);\n    // serialize it to UBJSON using size optimization\n    std::vector<std::uint8_t> v_array_size = json::to_ubjson(array, true);\n    // serialize it to UBJSON using type optimization\n    std::vector<std::uint8_t> v_array_size_and_type = json::to_ubjson(array, true, true);\n\n    // print the vector contents\n    for (auto& byte : v_array)\n    {\n        print_byte(byte);\n    }\n    std::cout << std::endl;\n\n    for (auto& byte : v_array_size)\n    {\n        print_byte(byte);\n    }\n    std::cout << std::endl;\n\n    for (auto& byte : v_array_size_and_type)\n    {\n        print_byte(byte);\n    }\n    std::cout << std::endl;\n}\n

    Output:

    {i7compactTi6schemaF}\n[i1i2i3i4i5i6i7i8]\n[#i8i1i2i3i4i5i6i7i8\n[$i#i812345678\n
    "},{"location":"api/basic_json/to_ubjson/#version-history","title":"Version history","text":"
    • Added in version 3.1.0.
    "},{"location":"api/basic_json/type/","title":"nlohmann::basic_json::type","text":"
    constexpr value_t type() const noexcept;\n

    Return the type of the JSON value as a value from the value_t enumeration.

    "},{"location":"api/basic_json/type/#return-value","title":"Return value","text":"

    the type of the JSON value

    Value type return value null value_t::null boolean value_t::boolean string value_t::string number (integer) value_t::number_integer number (unsigned integer) value_t::number_unsigned number (floating-point) value_t::number_float object value_t::object array value_t::array binary value_t::binary discarded value_t::discarded"},{"location":"api/basic_json/type/#exception-safety","title":"Exception safety","text":"

    No-throw guarantee: this member function never throws exceptions.

    "},{"location":"api/basic_json/type/#complexity","title":"Complexity","text":"

    Constant.

    "},{"location":"api/basic_json/type/#examples","title":"Examples","text":"Example

    The following code exemplifies type() for all JSON types.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // create JSON values\n    json j_null;\n    json j_boolean = true;\n    json j_number_integer = -17;\n    json j_number_unsigned = 42u;\n    json j_number_float = 23.42;\n    json j_object = {{\"one\", 1}, {\"two\", 2}};\n    json j_array = {1, 2, 4, 8, 16};\n    json j_string = \"Hello, world\";\n\n    // call type()\n    std::cout << std::boolalpha;\n    std::cout << (j_null.type() == json::value_t::null) << '\\n';\n    std::cout << (j_boolean.type() == json::value_t::boolean) << '\\n';\n    std::cout << (j_number_integer.type() == json::value_t::number_integer) << '\\n';\n    std::cout << (j_number_unsigned.type() == json::value_t::number_unsigned) << '\\n';\n    std::cout << (j_number_float.type() == json::value_t::number_float) << '\\n';\n    std::cout << (j_object.type() == json::value_t::object) << '\\n';\n    std::cout << (j_array.type() == json::value_t::array) << '\\n';\n    std::cout << (j_string.type() == json::value_t::string) << '\\n';\n}\n

    Output:

    true\ntrue\ntrue\ntrue\ntrue\ntrue\ntrue\ntrue\n
    "},{"location":"api/basic_json/type/#version-history","title":"Version history","text":"
    • Added in version 1.0.0.
    • Added unsigned integer type in version 2.0.0.
    • Added binary type in version 3.8.0.
    "},{"location":"api/basic_json/type_error/","title":"nlohmann::basic_json::type_error","text":"
    class type_error : public exception;\n

    This exception is thrown in case of a type error; that is, a library function is executed on a JSON value whose type does not match the expected semantics.

    Exceptions have ids 3xx (see list of type errors).

    classDiagram\n  direction LR\n\n    class std_exception [\"std::exception\"] {\n        <<interface>>\n    }\n\n    class json_exception [\"basic_json::exception\"] {\n        +const int id\n        +const char* what() const\n    }\n\n    class json_parse_error [\"basic_json::parse_error\"] {\n        +const std::size_t byte\n    }\n\n    class json_invalid_iterator [\"basic_json::invalid_iterator\"]\n    class json_type_error [\"basic_json::type_error\"]\n    class json_out_of_range [\"basic_json::out_of_range\"]\n    class json_other_error [\"basic_json::other_error\"]\n\n    std_exception <|-- json_exception\n    json_exception <|-- json_parse_error\n    json_exception <|-- json_invalid_iterator\n    json_exception <|-- json_type_error\n    json_exception <|-- json_out_of_range\n    json_exception <|-- json_other_error\n\n    style json_type_error fill:#CCCCFF
    "},{"location":"api/basic_json/type_error/#member-functions","title":"Member functions","text":"
    • what - returns explanatory string
    "},{"location":"api/basic_json/type_error/#member-variables","title":"Member variables","text":"
    • id - the id of the exception
    "},{"location":"api/basic_json/type_error/#examples","title":"Examples","text":"Example

    The following code shows how a type_error exception can be caught.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    try\n    {\n        // calling push_back() on a string value\n        json j = \"string\";\n        j.push_back(\"another string\");\n    }\n    catch (const json::type_error& e)\n    {\n        // output exception information\n        std::cout << \"message: \" << e.what() << '\\n'\n                  << \"exception id: \" << e.id << std::endl;\n    }\n}\n

    Output:

    message: [json.exception.type_error.308] cannot use push_back() with string\nexception id: 308\n
    "},{"location":"api/basic_json/type_error/#see-also","title":"See also","text":"
    • List of type errors
    • parse_error for exceptions indicating a parse error
    • invalid_iterator for exceptions indicating errors with iterators
    • out_of_range for exceptions indicating access out of the defined range
    • other_error for exceptions indicating other library errors
    "},{"location":"api/basic_json/type_error/#version-history","title":"Version history","text":"
    • Since version 3.0.0.
    "},{"location":"api/basic_json/type_name/","title":"nlohmann::basic_json::type_name","text":"
    const char* type_name() const noexcept;\n

    Returns the type name as string to be used in error messages -- usually to indicate that a function was called on a wrong JSON type.

    "},{"location":"api/basic_json/type_name/#return-value","title":"Return value","text":"

    a string representation of the type (value_t):

    Value type return value null \"null\" boolean \"boolean\" string \"string\" number (integer, unsigned integer, floating-point) \"number\" object \"object\" array \"array\" binary \"binary\" discarded \"discarded\""},{"location":"api/basic_json/type_name/#exception-safety","title":"Exception safety","text":"

    No-throw guarantee: this member function never throws exceptions.

    "},{"location":"api/basic_json/type_name/#complexity","title":"Complexity","text":"

    Constant.

    "},{"location":"api/basic_json/type_name/#examples","title":"Examples","text":"Example

    The following code exemplifies type_name() for all JSON types.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // create JSON values\n    json j_null;\n    json j_boolean = true;\n    json j_number_integer = -17;\n    json j_number_unsigned = 42u;\n    json j_number_float = 23.42;\n    json j_object = {{\"one\", 1}, {\"two\", 2}};\n    json j_array = {1, 2, 4, 8, 16};\n    json j_string = \"Hello, world\";\n\n    // call type_name()\n    std::cout << j_null << \" is a \" << j_null.type_name() << '\\n';\n    std::cout << j_boolean << \" is a \" << j_boolean.type_name() << '\\n';\n    std::cout << j_number_integer << \" is a \" << j_number_integer.type_name() << '\\n';\n    std::cout << j_number_unsigned << \" is a \" << j_number_unsigned.type_name() << '\\n';\n    std::cout << j_number_float << \" is a \" << j_number_float.type_name() << '\\n';\n    std::cout << j_object << \" is an \" << j_object.type_name() << '\\n';\n    std::cout << j_array << \" is an \" << j_array.type_name() << '\\n';\n    std::cout << j_string << \" is a \" << j_string.type_name() << '\\n';\n}\n

    Output:

    null is a null\ntrue is a boolean\n-17 is a number\n42 is a number\n23.42 is a number\n{\"one\":1,\"two\":2} is an object\n[1,2,4,8,16] is an array\n\"Hello, world\" is a string\n
    "},{"location":"api/basic_json/type_name/#version-history","title":"Version history","text":"
    • Added in version 1.0.0.
    • Part of the public API version since 2.1.0.
    • Changed return value to const char* and added noexcept in version 3.0.0.
    • Added support for binary type in version 3.8.0.
    "},{"location":"api/basic_json/unflatten/","title":"nlohmann::basic_json::unflatten","text":"
    basic_json unflatten() const;\n

    The function restores the arbitrary nesting of a JSON value that has been flattened before using the flatten() function. The JSON value must meet certain constraints:

    1. The value must be an object.
    2. The keys must be JSON pointers (see RFC 6901)
    3. The mapped values must be primitive JSON types.
    "},{"location":"api/basic_json/unflatten/#return-value","title":"Return value","text":"

    the original JSON from a flattened version

    "},{"location":"api/basic_json/unflatten/#exception-safety","title":"Exception safety","text":"

    Strong exception safety: if an exception occurs, the original value stays intact.

    "},{"location":"api/basic_json/unflatten/#exceptions","title":"Exceptions","text":"

    The function can throw the following exceptions:

    • Throws type_error.314 if value is not an object
    • Throws type_error.315 if object values are not primitive
    "},{"location":"api/basic_json/unflatten/#complexity","title":"Complexity","text":"

    Linear in the size of the JSON value.

    "},{"location":"api/basic_json/unflatten/#notes","title":"Notes","text":"

    Empty objects and arrays are flattened by flatten() to null values and cannot unflattened to their original type. Apart from this example, for a JSON value j, the following is always true: j == j.flatten().unflatten().

    "},{"location":"api/basic_json/unflatten/#examples","title":"Examples","text":"Example

    The following code shows how a flattened JSON object is unflattened into the original nested JSON object.

    #include <iostream>\n#include <iomanip>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // create JSON value\n    json j_flattened =\n    {\n        {\"/answer/everything\", 42},\n        {\"/happy\", true},\n        {\"/list/0\", 1},\n        {\"/list/1\", 0},\n        {\"/list/2\", 2},\n        {\"/name\", \"Niels\"},\n        {\"/nothing\", nullptr},\n        {\"/object/currency\", \"USD\"},\n        {\"/object/value\", 42.99},\n        {\"/pi\", 3.141}\n    };\n\n    // call unflatten()\n    std::cout << std::setw(4) << j_flattened.unflatten() << '\\n';\n}\n

    Output:

    {\n    \"answer\": {\n        \"everything\": 42\n    },\n    \"happy\": true,\n    \"list\": [\n        1,\n        0,\n        2\n    ],\n    \"name\": \"Niels\",\n    \"nothing\": null,\n    \"object\": {\n        \"currency\": \"USD\",\n        \"value\": 42.99\n    },\n    \"pi\": 3.141\n}\n
    "},{"location":"api/basic_json/unflatten/#see-also","title":"See also","text":"
    • flatten the reverse function
    "},{"location":"api/basic_json/unflatten/#version-history","title":"Version history","text":"
    • Added in version 2.0.0.
    "},{"location":"api/basic_json/update/","title":"nlohmann::basic_json::update","text":"
    // (1)\nvoid update(const_reference j, bool merge_objects = false);\n\n// (2)\nvoid update(const_iterator first, const_iterator last, bool merge_objects = false);\n
    1. Inserts all values from JSON object j.
    2. Inserts all values from range [first, last)

    When merge_objects is false (default), existing keys are overwritten. When merge_objects is true, recursively merges objects with common keys.

    The function is motivated by Python's dict.update function.

    "},{"location":"api/basic_json/update/#iterator-invalidation","title":"Iterator invalidation","text":"

    For ordered_json, adding a value to an object can yield a reallocation, in which case all iterators (including the end() iterator) and all references to the elements are invalidated.

    "},{"location":"api/basic_json/update/#parameters","title":"Parameters","text":"j (in) JSON object to read values from merge_objects (in) when true, existing keys are not overwritten, but contents of objects are merged recursively (default: false) first (in) the beginning of the range of elements to insert last (in) the end of the range of elements to insert"},{"location":"api/basic_json/update/#exceptions","title":"Exceptions","text":"
    1. The function can throw the following exceptions:
      • Throws type_error.312 if called on JSON values other than objects; example: \"cannot use update() with string\"
    2. The function can throw the following exceptions:
      • Throws type_error.312 if called on JSON values other than objects; example: \"cannot use update() with string\"
      • Throws invalid_iterator.202 if called on an iterator which does not belong to the current JSON value; example: \"iterator does not fit current value\"
      • Throws invalid_iterator.210 if first and last do not belong to the same JSON value; example: \"iterators do not fit\"
    "},{"location":"api/basic_json/update/#complexity","title":"Complexity","text":"
    1. O(N*log(size() + N)), where N is the number of elements to insert.
    2. O(N*log(size() + N)), where N is the number of elements to insert.
    "},{"location":"api/basic_json/update/#examples","title":"Examples","text":"Example

    The example shows how update() is used.

    #include <iostream>\n#include <iomanip>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\nusing namespace nlohmann::literals;\n\nint main()\n{\n    // create two JSON objects\n    json o1 = R\"( {\"color\": \"red\", \"price\": 17.99, \"names\": {\"de\": \"Flugzeug\"}} )\"_json;\n    json o2 = R\"( {\"color\": \"blue\", \"speed\": 100, \"names\": {\"en\": \"plane\"}} )\"_json;\n    json o3 = o1;\n\n    // add all keys from o2 to o1 (updating \"color\", replacing \"names\")\n    o1.update(o2);\n\n    // add all keys from o2 to o1 (updating \"color\", merging \"names\")\n    o3.update(o2, true);\n\n    // output updated object o1 and o3\n    std::cout << std::setw(2) << o1 << '\\n';\n    std::cout << std::setw(2) << o3 << '\\n';\n}\n

    Output:

    {\n  \"color\": \"blue\",\n  \"names\": {\n    \"en\": \"plane\"\n  },\n  \"price\": 17.99,\n  \"speed\": 100\n}\n{\n  \"color\": \"blue\",\n  \"names\": {\n    \"de\": \"Flugzeug\",\n    \"en\": \"plane\"\n  },\n  \"price\": 17.99,\n  \"speed\": 100\n}\n
    Example

    The example shows how update() is used.

    #include <iostream>\n#include <iomanip>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\nusing namespace nlohmann::literals;\n\nint main()\n{\n    // create two JSON objects\n    json o1 = R\"( {\"color\": \"red\", \"price\": 17.99, \"names\": {\"de\": \"Flugzeug\"}} )\"_json;\n    json o2 = R\"( {\"color\": \"blue\", \"speed\": 100, \"names\": {\"en\": \"plane\"}} )\"_json;\n    json o3 = o1;\n\n    // add all keys from o2 to o1 (updating \"color\", replacing \"names\")\n    o1.update(o2.begin(), o2.end());\n\n    // add all keys from o2 to o1 (updating \"color\", merging \"names\")\n    o3.update(o2.begin(), o2.end(), true);\n\n    // output updated object o1 and o3\n    std::cout << std::setw(2) << o1 << '\\n';\n    std::cout << std::setw(2) << o3 << '\\n';\n}\n

    Output:

    {\n  \"color\": \"blue\",\n  \"names\": {\n    \"en\": \"plane\"\n  },\n  \"price\": 17.99,\n  \"speed\": 100\n}\n{\n  \"color\": \"blue\",\n  \"names\": {\n    \"de\": \"Flugzeug\",\n    \"en\": \"plane\"\n  },\n  \"price\": 17.99,\n  \"speed\": 100\n}\n
    Example

    One common use case for this function is the handling of user settings. Assume your application can be configured in some aspects:

    {\n    \"color\": \"red\",\n    \"active\": true,\n    \"name\": {\"de\": \"Maus\", \"en\": \"mouse\"}\n}\n

    The user may override the default settings selectively:

    {\n    \"color\": \"blue\",\n    \"name\": {\"es\": \"rat\u00f3n\"},\n}\n

    Then update manages the merging of default settings and user settings:

    auto user_settings = json::parse(\"config.json\");\nauto effective_settings = get_default_settings();\neffective_settings.update(user_settings);\n

    Now effective_settings contains the default settings, but those keys set by the user are overwritten:

    {\n    \"color\": \"blue\",\n    \"active\": true,\n    \"name\": {\"es\": \"rat\u00f3n\"}\n}\n

    Note existing keys were just overwritten. To merge objects, merge_objects setting should be set to true:

    auto user_settings = json::parse(\"config.json\");\nauto effective_settings = get_default_settings();\neffective_settings.update(user_settings, true);\n
    {\n    \"color\": \"blue\",\n    \"active\": true,\n    \"name\": {\"de\": \"Maus\", \"en\": \"mouse\", \"es\": \"rat\u00f3n\"}\n}\n
    "},{"location":"api/basic_json/update/#version-history","title":"Version history","text":"
    • Added in version 3.0.0.
    • Added merge_objects parameter in 3.10.5.
    "},{"location":"api/basic_json/value/","title":"nlohmann::basic_json::value","text":"
    // (1)\ntemplate<class ValueType>\nValueType value(const typename object_t::key_type& key,\n                ValueType&& default_value) const;\n\n// (2)\ntemplate<class ValueType, class KeyType>\nValueType value(KeyType&& key,\n                ValueType&& default_value) const;\n\n// (3)\ntemplate<class ValueType>\nValueType value(const json_pointer& ptr,\n                const ValueType& default_value) const;\n

    1. Returns either a copy of an object's element at the specified key key or a given default value if no element with key key exists.

      The function is basically equivalent to executing 

      try {\n   return at(key);\n} catch(out_of_range) {\n   return default_value;\n}\n

    2. See 1. This overload is only available if KeyType is comparable with typename object_t::key_type and typename object_comparator_t::is_transparent denotes a type.

    3. Returns either a copy of an object's element at the specified JSON pointer ptr or a given default value if no value at ptr exists.

      The function is basically equivalent to executing 

      try {\n   return at(ptr);\n} catch(out_of_range) {\n   return default_value;\n}\n

    Differences to at and operator[]

    • Unlike at, this function does not throw if the given key/ptr was not found.
    • Unlike operator[], this function does not implicitly add an element to the position defined by key/ptr key. This function is furthermore also applicable to const objects.
    "},{"location":"api/basic_json/value/#template-parameters","title":"Template parameters","text":"KeyType A type for an object key other than json_pointer that is comparable with string_t using object_comparator_t. This can also be a string view (C++17). ValueType type compatible to JSON values, for instance int for JSON integer numbers, bool for JSON booleans, or std::vector types for JSON arrays. Note the type of the expected value at key/ptr and the default value default_value must be compatible."},{"location":"api/basic_json/value/#parameters","title":"Parameters","text":"key (in) key of the element to access default_value (in) the value to return if key/ptr found no value ptr (in) a JSON pointer to the element to access"},{"location":"api/basic_json/value/#return-value","title":"Return value","text":"
    1. copy of the element at key key or default_value if key is not found
    2. copy of the element at key key or default_value if key is not found
    3. copy of the element at JSON Pointer ptr or default_value if no value for ptr is found
    "},{"location":"api/basic_json/value/#exception-safety","title":"Exception safety","text":"

    Strong guarantee: if an exception is thrown, there are no changes to any JSON value.

    "},{"location":"api/basic_json/value/#exceptions","title":"Exceptions","text":"
    1. The function can throw the following exceptions:
      • Throws type_error.302 if default_value does not match the type of the value at key
      • Throws type_error.306 if the JSON value is not an object; in that case, using value() with a key makes no sense.
    2. See 1.
    3. The function can throw the following exceptions:
      • Throws type_error.302 if default_value does not match the type of the value at ptr
      • Throws type_error.306 if the JSON value is not an object; in that case, using value() with a key makes no sense.
    "},{"location":"api/basic_json/value/#complexity","title":"Complexity","text":"
    1. Logarithmic in the size of the container.
    2. Logarithmic in the size of the container.
    3. Logarithmic in the size of the container.
    "},{"location":"api/basic_json/value/#notes","title":"Notes","text":"

    Return type

    The value function is a template, and the return type of the function is determined by the type of the provided default value unless otherwise specified. This can have unexpected effects. In the example below, we store a 64-bit unsigned integer. We get exactly that value when using operator[]. However, when we call value and provide 0 as default value, then -1 is returned. The occurs, because 0 has type int which overflows when handling the value 18446744073709551615.

    To address this issue, either provide a correctly typed default value or use the template parameter to specify the desired return type. Note that this issue occurs even when a value is stored at the provided key, and the default value is not used as the return value.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    json j = json::parse(R\"({\"uint64\": 18446744073709551615})\");\n\n    std::cout << \"operator[]:                \" << j[\"uint64\"] << '\\n'\n              << \"default value (int):       \" << j.value(\"uint64\", 0) << '\\n'\n              << \"default value (uint64_t):  \" << j.value(\"uint64\", std::uint64_t(0)) << '\\n'\n              << \"explict return value type: \" << j.value<std::uint64_t>(\"uint64\", 0) << '\\n';\n}\n

    Output:

    operator[]:                18446744073709551615\ndefault value (int):       -1\ndefault value (uint64_t):  18446744073709551615\nexplict return value type: 18446744073709551615\n
    "},{"location":"api/basic_json/value/#examples","title":"Examples","text":"Example: (1) access specified object element with default value

    The example below shows how object elements can be queried with a default value.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // create a JSON object with different entry types\n    json j =\n    {\n        {\"integer\", 1},\n        {\"floating\", 42.23},\n        {\"string\", \"hello world\"},\n        {\"boolean\", true},\n        {\"object\", {{\"key1\", 1}, {\"key2\", 2}}},\n        {\"array\", {1, 2, 3}}\n    };\n\n    // access existing values\n    int v_integer = j.value(\"integer\", 0);\n    double v_floating = j.value(\"floating\", 47.11);\n\n    // access nonexisting values and rely on default value\n    std::string v_string = j.value(\"nonexisting\", \"oops\");\n    bool v_boolean = j.value(\"nonexisting\", false);\n\n    // output values\n    std::cout << std::boolalpha << v_integer << \" \" << v_floating\n              << \" \" << v_string << \" \" << v_boolean << \"\\n\";\n}\n

    Output:

    1 42.23 oops false\n
    Example: (2) access specified object element using string_view with default value

    The example below shows how object elements can be queried with a default value.

    #include <iostream>\n#include <string_view>\n#include <nlohmann/json.hpp>\n\nusing namespace std::string_view_literals;\nusing json = nlohmann::json;\n\nint main()\n{\n    // create a JSON object with different entry types\n    json j =\n    {\n        {\"integer\", 1},\n        {\"floating\", 42.23},\n        {\"string\", \"hello world\"},\n        {\"boolean\", true},\n        {\"object\", {{\"key1\", 1}, {\"key2\", 2}}},\n        {\"array\", {1, 2, 3}}\n    };\n\n    // access existing values\n    int v_integer = j.value(\"integer\"sv, 0);\n    double v_floating = j.value(\"floating\"sv, 47.11);\n\n    // access nonexisting values and rely on default value\n    std::string v_string = j.value(\"nonexisting\"sv, \"oops\");\n    bool v_boolean = j.value(\"nonexisting\"sv, false);\n\n    // output values\n    std::cout << std::boolalpha << v_integer << \" \" << v_floating\n              << \" \" << v_string << \" \" << v_boolean << \"\\n\";\n}\n

    Output:

    1 42.23 oops false\n
    Example: (3) access specified object element via JSON Pointer with default value

    The example below shows how object elements can be queried with a default value.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\nusing namespace nlohmann::literals;\n\nint main()\n{\n    // create a JSON object with different entry types\n    json j =\n    {\n        {\"integer\", 1},\n        {\"floating\", 42.23},\n        {\"string\", \"hello world\"},\n        {\"boolean\", true},\n        {\"object\", {{\"key1\", 1}, {\"key2\", 2}}},\n        {\"array\", {1, 2, 3}}\n    };\n\n    // access existing values\n    int v_integer = j.value(\"/integer\"_json_pointer, 0);\n    double v_floating = j.value(\"/floating\"_json_pointer, 47.11);\n\n    // access nonexisting values and rely on default value\n    std::string v_string = j.value(\"/nonexisting\"_json_pointer, \"oops\");\n    bool v_boolean = j.value(\"/nonexisting\"_json_pointer, false);\n\n    // output values\n    std::cout << std::boolalpha << v_integer << \" \" << v_floating\n              << \" \" << v_string << \" \" << v_boolean << \"\\n\";\n}\n

    Output:

    1 42.23 oops false\n
    "},{"location":"api/basic_json/value/#see-also","title":"See also","text":"
    • see at for access by reference with range checking
    • see operator[] for unchecked access by reference
    "},{"location":"api/basic_json/value/#version-history","title":"Version history","text":"
    1. Added in version 1.0.0. Changed parameter default_value type from const ValueType& to ValueType&& in version 3.11.0.
    2. Added in version 3.11.0. Made ValueType the first template parameter in version 3.11.2.
    3. Added in version 2.0.2.
    "},{"location":"api/basic_json/value_t/","title":"nlohmann::basic_json::value_t","text":"
    enum class value_t : std::uint8_t {\n    null,\n    object,\n    array,\n    string,\n    boolean,\n    number_integer,\n    number_unsigned,\n    number_float,\n    binary,\n    discarded\n};\n

    This enumeration collects the different JSON types. It is internally used to distinguish the stored values, and the functions is_null, is_object, is_array, is_string, is_boolean, is_number (with is_number_integer, is_number_unsigned, and is_number_float), is_discarded, is_binary, is_primitive, and is_structured rely on it.

    "},{"location":"api/basic_json/value_t/#notes","title":"Notes","text":"

    Ordering

    The order of types is as follows:

    1. null
    2. boolean
    3. number_integer, number_unsigned, number_float
    4. object
    5. array
    6. string
    7. binary

    discarded is unordered.

    Types of numbers

    There are three enumerators for numbers (number_integer, number_unsigned, and number_float) to distinguish between different types of numbers:

    • number_unsigned_t for unsigned integers
    • number_integer_t for signed integers
    • number_float_t for floating-point numbers or to approximate integers which do not fit into the limits of their respective type

    Comparison operators

    operator< and operator<=> (since C++20) are overloaded and compare according to the ordering described above. Until C++20 all other relational and equality operators yield results according to the integer value of each enumerator. Since C++20 some compilers consider the rewritten candidates generated from operator<=> during overload resolution, while others do not. For predictable and portable behavior use:

    • operator< or operator<=> when wanting to compare according to the order described above
    • operator== or operator!= when wanting to compare according to each enumerators integer value
    "},{"location":"api/basic_json/value_t/#examples","title":"Examples","text":"Example

    The following code how type() queries the value_t for all JSON types.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // create JSON values\n    json j_null;\n    json j_boolean = true;\n    json j_number_integer = -17;\n    json j_number_unsigned = 42u;\n    json j_number_float = 23.42;\n    json j_object = {{\"one\", 1}, {\"two\", 2}};\n    json j_array = {1, 2, 4, 8, 16};\n    json j_string = \"Hello, world\";\n\n    // call type()\n    std::cout << std::boolalpha;\n    std::cout << (j_null.type() == json::value_t::null) << '\\n';\n    std::cout << (j_boolean.type() == json::value_t::boolean) << '\\n';\n    std::cout << (j_number_integer.type() == json::value_t::number_integer) << '\\n';\n    std::cout << (j_number_unsigned.type() == json::value_t::number_unsigned) << '\\n';\n    std::cout << (j_number_float.type() == json::value_t::number_float) << '\\n';\n    std::cout << (j_object.type() == json::value_t::object) << '\\n';\n    std::cout << (j_array.type() == json::value_t::array) << '\\n';\n    std::cout << (j_string.type() == json::value_t::string) << '\\n';\n}\n

    Output:

    true\ntrue\ntrue\ntrue\ntrue\ntrue\ntrue\ntrue\n
    "},{"location":"api/basic_json/value_t/#version-history","title":"Version history","text":"
    • Added in version 1.0.0.
    • Added unsigned integer type in version 2.0.0.
    • Added binary type in version 3.8.0.
    "},{"location":"api/basic_json/~basic_json/","title":"nlohmann::basic_json::~basic_json","text":"
    ~basic_json() noexcept;\n

    Destroys the JSON value and frees all allocated memory.

    "},{"location":"api/basic_json/~basic_json/#exception-safety","title":"Exception safety","text":"

    No-throw guarantee: this member function never throws exceptions.

    "},{"location":"api/basic_json/~basic_json/#complexity","title":"Complexity","text":"

    Linear.

    "},{"location":"api/basic_json/~basic_json/#version-history","title":"Version history","text":"
    • Added in version 1.0.0.
    "},{"location":"api/byte_container_with_subtype/","title":"nlohmann::byte_container_with_subtype","text":"
    template<typename BinaryType>\nclass byte_container_with_subtype : public BinaryType;\n

    This type extends the template parameter BinaryType provided to basic_json with a subtype used by BSON and MessagePack. This type exists so that the user does not have to specify a type themselves with a specific naming scheme in order to override the binary type.

    "},{"location":"api/byte_container_with_subtype/#template-parameters","title":"Template parameters","text":"BinaryType container to store bytes (std::vector<std::uint8_t> by default)"},{"location":"api/byte_container_with_subtype/#member-types","title":"Member types","text":"
    • container_type - the type of the underlying container (BinaryType)
    • subtype_type - the type of the subtype (std::uint64_t)
    "},{"location":"api/byte_container_with_subtype/#member-functions","title":"Member functions","text":"
    • (constructor)
    • operator== - comparison: equal
    • operator!= - comparison: not equal
    • set_subtype - sets the binary subtype
    • subtype - return the binary subtype
    • has_subtype - return whether the value has a subtype
    • clear_subtype - clears the binary subtype
    "},{"location":"api/byte_container_with_subtype/#version-history","title":"Version history","text":"
    • Added in version 3.8.0.
    • Changed the type of subtypes to std::uint64_t in 3.10.0.
    "},{"location":"api/byte_container_with_subtype/byte_container_with_subtype/","title":"nlohmann::byte_container_with_subtype::byte_container_with_subtype","text":"
    // (1)\nbyte_container_with_subtype();\n\n// (2)\nbyte_container_with_subtype(const container_type& container);\nbyte_container_with_subtype(container_type&& container);\n\n// (3)\nbyte_container_with_subtype(const container_type& container, subtype_type subtype);\nbyte_container_with_subtype(container_type&& container, subtype_type subtype);\n
    1. Create an empty binary container without a subtype.
    2. Create a binary container without a subtype.
    3. Create a binary container with a subtype.
    "},{"location":"api/byte_container_with_subtype/byte_container_with_subtype/#parameters","title":"Parameters","text":"container (in) binary container subtype (in) subtype"},{"location":"api/byte_container_with_subtype/byte_container_with_subtype/#examples","title":"Examples","text":"Example

    The example below demonstrates how byte containers can be created.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\n// define a byte container based on std::vector\nusing byte_container_with_subtype = nlohmann::byte_container_with_subtype<std::vector<std::uint8_t>>;\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // (1) create empty container\n    auto c1 = byte_container_with_subtype();\n\n    std::vector<std::uint8_t> bytes = {{0xca, 0xfe, 0xba, 0xbe}};\n\n    // (2) create container\n    auto c2 = byte_container_with_subtype(bytes);\n\n    // (3) create container with subtype\n    auto c3 = byte_container_with_subtype(bytes, 42);\n\n    std::cout << json(c1) << \"\\n\" << json(c2) << \"\\n\" << json(c3) << std::endl;\n}\n

    Output:

    {\"bytes\":[],\"subtype\":null}\n{\"bytes\":[202,254,186,190],\"subtype\":null}\n{\"bytes\":[202,254,186,190],\"subtype\":42}\n
    "},{"location":"api/byte_container_with_subtype/byte_container_with_subtype/#version-history","title":"Version history","text":"

    Since version 3.8.0.

    "},{"location":"api/byte_container_with_subtype/clear_subtype/","title":"nlohmann::byte_container_with_subtype::clear_subtype","text":"
    void clear_subtype() noexcept;\n

    Clears the binary subtype and flags the value as not having a subtype, which has implications for serialization; for instance, MessagePack will prefer the bin family over the ext family.

    "},{"location":"api/byte_container_with_subtype/clear_subtype/#exception-safety","title":"Exception safety","text":"

    No-throw guarantee: this function never throws exceptions.

    "},{"location":"api/byte_container_with_subtype/clear_subtype/#complexity","title":"Complexity","text":"

    Constant.

    "},{"location":"api/byte_container_with_subtype/clear_subtype/#examples","title":"Examples","text":"Example

    The example below demonstrates how clear_subtype can remove subtypes.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\n// define a byte container based on std::vector\nusing byte_container_with_subtype = nlohmann::byte_container_with_subtype<std::vector<std::uint8_t>>;\n\nusing json = nlohmann::json;\n\nint main()\n{\n    std::vector<std::uint8_t> bytes = {{0xca, 0xfe, 0xba, 0xbe}};\n\n    // create container with subtype\n    auto c1 = byte_container_with_subtype(bytes, 42);\n\n    std::cout << \"before calling clear_subtype(): \" << json(c1) << '\\n';\n\n    c1.clear_subtype();\n\n    std::cout << \"after calling clear_subtype(): \" << json(c1) << '\\n';\n}\n

    Output:

    before calling clear_subtype(): {\"bytes\":[202,254,186,190],\"subtype\":42}\nafter calling clear_subtype(): {\"bytes\":[202,254,186,190],\"subtype\":null}\n
    "},{"location":"api/byte_container_with_subtype/clear_subtype/#version-history","title":"Version history","text":"

    Since version 3.8.0.

    "},{"location":"api/byte_container_with_subtype/has_subtype/","title":"nlohmann::byte_container_with_subtype::has_subtype","text":"
    constexpr bool has_subtype() const noexcept;\n

    Returns whether the value has a subtype.

    "},{"location":"api/byte_container_with_subtype/has_subtype/#return-value","title":"Return value","text":"

    whether the value has a subtype

    "},{"location":"api/byte_container_with_subtype/has_subtype/#exception-safety","title":"Exception safety","text":"

    No-throw guarantee: this function never throws exceptions.

    "},{"location":"api/byte_container_with_subtype/has_subtype/#complexity","title":"Complexity","text":"

    Constant.

    "},{"location":"api/byte_container_with_subtype/has_subtype/#examples","title":"Examples","text":"Example

    The example below demonstrates how has_subtype can check whether a subtype was set.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\n// define a byte container based on std::vector\nusing byte_container_with_subtype = nlohmann::byte_container_with_subtype<std::vector<std::uint8_t>>;\n\nint main()\n{\n    std::vector<std::uint8_t> bytes = {{0xca, 0xfe, 0xba, 0xbe}};\n\n    // create container\n    auto c1 = byte_container_with_subtype(bytes);\n\n    // create container with subtype\n    auto c2 = byte_container_with_subtype(bytes, 42);\n\n    std::cout << std::boolalpha << \"c1.has_subtype() = \" << c1.has_subtype()\n              << \"\\nc2.has_subtype() = \" << c2.has_subtype() << std::endl;\n}\n

    Output:

    c1.has_subtype() = false\nc2.has_subtype() = true\n
    "},{"location":"api/byte_container_with_subtype/has_subtype/#version-history","title":"Version history","text":"

    Since version 3.8.0.

    "},{"location":"api/byte_container_with_subtype/set_subtype/","title":"nlohmann::byte_container_with_subtype::set_subtype","text":"
    void set_subtype(subtype_type subtype) noexcept;\n

    Sets the binary subtype of the value, also flags a binary JSON value as having a subtype, which has implications for serialization.

    "},{"location":"api/byte_container_with_subtype/set_subtype/#parameters","title":"Parameters","text":"subtype (in) subtype to set"},{"location":"api/byte_container_with_subtype/set_subtype/#exception-safety","title":"Exception safety","text":"

    No-throw guarantee: this function never throws exceptions.

    "},{"location":"api/byte_container_with_subtype/set_subtype/#complexity","title":"Complexity","text":"

    Constant.

    "},{"location":"api/byte_container_with_subtype/set_subtype/#examples","title":"Examples","text":"Example

    The example below demonstrates how a subtype can be set with set_subtype.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\n// define a byte container based on std::vector\nusing byte_container_with_subtype = nlohmann::byte_container_with_subtype<std::vector<std::uint8_t>>;\n\nusing json = nlohmann::json;\n\nint main()\n{\n    std::vector<std::uint8_t> bytes = {{0xca, 0xfe, 0xba, 0xbe}};\n\n    // create container without subtype\n    auto c = byte_container_with_subtype(bytes);\n\n    std::cout << \"before calling set_subtype(42): \" << json(c) << '\\n';\n\n    // set the subtype\n    c.set_subtype(42);\n\n    std::cout << \"after calling set_subtype(42): \" << json(c) << '\\n';\n}\n

    Output:

    before calling set_subtype(42): {\"bytes\":[202,254,186,190],\"subtype\":null}\nafter calling set_subtype(42): {\"bytes\":[202,254,186,190],\"subtype\":42}\n
    "},{"location":"api/byte_container_with_subtype/set_subtype/#version-history","title":"Version history","text":"

    Since version 3.8.0.

    "},{"location":"api/byte_container_with_subtype/subtype/","title":"nlohmann::byte_container_with_subtype::subtype","text":"
    constexpr subtype_type subtype() const noexcept;\n

    Returns the numerical subtype of the value if it has a subtype. If it does not have a subtype, this function will return subtype_type(-1) as a sentinel value.

    "},{"location":"api/byte_container_with_subtype/subtype/#return-value","title":"Return value","text":"

    the numerical subtype of the binary value, or subtype_type(-1) if no subtype is set

    "},{"location":"api/byte_container_with_subtype/subtype/#exception-safety","title":"Exception safety","text":"

    No-throw guarantee: this function never throws exceptions.

    "},{"location":"api/byte_container_with_subtype/subtype/#complexity","title":"Complexity","text":"

    Constant.

    "},{"location":"api/byte_container_with_subtype/subtype/#examples","title":"Examples","text":"Example

    The example below demonstrates how the subtype can be retrieved with subtype. Note how subtype_type(-1) is returned for container c1.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\n// define a byte container based on std::vector\nusing byte_container_with_subtype = nlohmann::byte_container_with_subtype<std::vector<std::uint8_t>>;\n\nint main()\n{\n    std::vector<std::uint8_t> bytes = {{0xca, 0xfe, 0xba, 0xbe}};\n\n    // create container\n    auto c1 = byte_container_with_subtype(bytes);\n\n    // create container with subtype\n    auto c2 = byte_container_with_subtype(bytes, 42);\n\n    std::cout << \"c1.subtype() = \" << c1.subtype()\n              << \"\\nc2.subtype() = \" << c2.subtype() << std::endl;\n\n    // in case no subtype is set, return special value\n    assert(c1.subtype() == static_cast<byte_container_with_subtype::subtype_type>(-1));\n}\n

    Output:

    c1.subtype() = 18446744073709551615\nc2.subtype() = 42\n
    "},{"location":"api/byte_container_with_subtype/subtype/#version-history","title":"Version history","text":"
    • Added in version 3.8.0
    • Fixed return value to properly return subtype_type(-1) as documented in version 3.10.0.
    "},{"location":"api/json_pointer/","title":"nlohmann::json_pointer","text":"
    template<typename RefStringType>\nclass json_pointer;\n

    A JSON pointer defines a string syntax for identifying a specific value within a JSON document. It can be used with functions at and operator[]. Furthermore, JSON pointers are the base for JSON patches.

    "},{"location":"api/json_pointer/#template-parameters","title":"Template parameters","text":"RefStringType the string type used for the reference tokens making up the JSON pointer

    Deprecation

    For backwards compatibility RefStringType may also be a specialization of basic_json in which case string_t will be deduced as basic_json::string_t. This feature is deprecated and may be removed in a future major version.

    "},{"location":"api/json_pointer/#member-types","title":"Member types","text":"
    • string_t - the string type used for the reference tokens
    "},{"location":"api/json_pointer/#member-functions","title":"Member functions","text":"
    • (constructor)
    • to_string - return a string representation of the JSON pointer
    • operator string_t - return a string representation of the JSON pointer
    • operator== - compare: equal
    • operator!= - compare: not equal
    • operator/= - append to the end of the JSON pointer
    • operator/ - create JSON Pointer by appending
    • parent_pointer - returns the parent of this JSON pointer
    • pop_back - remove the last reference token
    • back - return last reference token
    • push_back - append an unescaped token at the end of the pointer
    • empty - return whether the pointer points to the root document
    "},{"location":"api/json_pointer/#literals","title":"Literals","text":"
    • operator\"\"_json_pointer - user-defined string literal for JSON pointers
    "},{"location":"api/json_pointer/#see-also","title":"See also","text":"
    • RFC 6901
    "},{"location":"api/json_pointer/#version-history","title":"Version history","text":"
    • Added in version 2.0.0.
    • Changed template parameter from basic_json to string type in version 3.11.0.
    "},{"location":"api/json_pointer/back/","title":"nlohmann::json_pointer::back","text":"
    const string_t& back() const;\n

    Return the last reference token.

    "},{"location":"api/json_pointer/back/#return-value","title":"Return value","text":"

    Last reference token.

    "},{"location":"api/json_pointer/back/#exceptions","title":"Exceptions","text":"

    Throws out_of_range.405 if the JSON pointer has no parent.

    "},{"location":"api/json_pointer/back/#complexity","title":"Complexity","text":"

    Constant.

    "},{"location":"api/json_pointer/back/#examples","title":"Examples","text":"Example

    The example shows the usage of back.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // different JSON Pointers\n    json::json_pointer ptr1(\"/foo\");\n    json::json_pointer ptr2(\"/foo/0\");\n\n    // call empty()\n    std::cout << \"last reference token of \\\"\" << ptr1 << \"\\\" is \\\"\" << ptr1.back() << \"\\\"\\n\"\n              << \"last reference token of \\\"\" << ptr2 << \"\\\" is \\\"\" << ptr2.back() << \"\\\"\" << std::endl;\n}\n

    Output:

    last reference token of \"/foo\" is \"foo\"\nlast reference token of \"/foo/0\" is \"0\"\n
    "},{"location":"api/json_pointer/back/#version-history","title":"Version history","text":"
    • Added in version 3.6.0.
    • Changed return type to string_t in version 3.11.0.
    "},{"location":"api/json_pointer/empty/","title":"nlohmann::json_pointer::empty","text":"
    bool empty() const noexcept;\n

    Return whether the pointer points to the root document.

    "},{"location":"api/json_pointer/empty/#return-value","title":"Return value","text":"

    true iff the JSON pointer points to the root document.

    "},{"location":"api/json_pointer/empty/#exception-safety","title":"Exception safety","text":"

    No-throw guarantee: this function never throws exceptions.

    "},{"location":"api/json_pointer/empty/#complexity","title":"Complexity","text":"

    Constant.

    "},{"location":"api/json_pointer/empty/#examples","title":"Examples","text":"Example

    The example shows the result of empty for different JSON Pointers.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // different JSON Pointers\n    json::json_pointer ptr0;\n    json::json_pointer ptr1(\"\");\n    json::json_pointer ptr2(\"/foo\");\n    json::json_pointer ptr3(\"/foo/0\");\n\n    // call empty()\n    std::cout << std::boolalpha\n              << \"\\\"\" << ptr0 << \"\\\": \" << ptr0.empty() << '\\n'\n              << \"\\\"\" << ptr1 << \"\\\": \" << ptr1.empty() << '\\n'\n              << \"\\\"\" << ptr2 << \"\\\": \" << ptr2.empty() << '\\n'\n              << \"\\\"\" << ptr3 << \"\\\": \" << ptr3.empty() << std::endl;\n}\n

    Output:

    \"\": true\n\"\": true\n\"/foo\": false\n\"/foo/0\": false\n
    "},{"location":"api/json_pointer/empty/#version-history","title":"Version history","text":"

    Added in version 3.6.0.

    "},{"location":"api/json_pointer/json_pointer/","title":"nlohmann::json_pointer::json_pointer","text":"
    explicit json_pointer(const string_t& s = \"\");\n

    Create a JSON pointer according to the syntax described in Section 3 of RFC6901.

    "},{"location":"api/json_pointer/json_pointer/#parameters","title":"Parameters","text":"s (in) string representing the JSON pointer; if omitted, the empty string is assumed which references the whole JSON value"},{"location":"api/json_pointer/json_pointer/#exceptions","title":"Exceptions","text":"
    • Throws parse_error.107 if the given JSON pointer s is nonempty and does not begin with a slash (/); see example below.
    • Throws parse_error.108 if a tilde (~) in the given JSON pointer s is not followed by 0 (representing ~) or 1 (representing /); see example below.
    "},{"location":"api/json_pointer/json_pointer/#examples","title":"Examples","text":"Example

    The example shows the construction several valid JSON pointers as well as the exceptional behavior.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // correct JSON pointers\n    json::json_pointer p1;\n    json::json_pointer p2(\"\");\n    json::json_pointer p3(\"/\");\n    json::json_pointer p4(\"//\");\n    json::json_pointer p5(\"/foo/bar\");\n    json::json_pointer p6(\"/foo/bar/-\");\n    json::json_pointer p7(\"/foo/~0\");\n    json::json_pointer p8(\"/foo/~1\");\n\n    // error: JSON pointer does not begin with a slash\n    try\n    {\n        json::json_pointer p9(\"foo\");\n    }\n    catch (const json::parse_error& e)\n    {\n        std::cout << e.what() << '\\n';\n    }\n\n    // error: JSON pointer uses escape symbol ~ not followed by 0 or 1\n    try\n    {\n        json::json_pointer p10(\"/foo/~\");\n    }\n    catch (const json::parse_error& e)\n    {\n        std::cout << e.what() << '\\n';\n    }\n\n    // error: JSON pointer uses escape symbol ~ not followed by 0 or 1\n    try\n    {\n        json::json_pointer p11(\"/foo/~3\");\n    }\n    catch (const json::parse_error& e)\n    {\n        std::cout << e.what() << '\\n';\n    }\n}\n

    Output:

    [json.exception.parse_error.107] parse error at byte 1: JSON pointer must be empty or begin with '/' - was: 'foo'\n[json.exception.parse_error.108] parse error: escape character '~' must be followed with '0' or '1'\n[json.exception.parse_error.108] parse error: escape character '~' must be followed with '0' or '1'\n
    "},{"location":"api/json_pointer/json_pointer/#version-history","title":"Version history","text":"
    • Added in version 2.0.0.
    • Changed type of s to string_t in version 3.11.0.
    "},{"location":"api/json_pointer/operator_eq/","title":"nlohmann::json_pointer::operator==","text":"
    // until C++20\ntemplate<typename RefStringTypeLhs, typename RefStringTypeRhs>\nbool operator==(\n    const json_pointer<RefStringTypeLhs>& lhs,\n    const json_pointer<RefStringTypeRhs>& rhs) noexcept;            // (1)\n\ntemplate<typename RefStringTypeLhs, typename StringType>\nbool operator==(\n    const json_pointer<RefStringTypeLhs>& lhs,\n    const StringType& rhs);                                         // (2)\n\ntemplate<typename RefStringTypeRhs, typename StringType>\nbool operator==(\n    const StringType& lhs,\n    const json_pointer<RefStringTypeRhs>& rhs);                     // (2)\n\n// since C++20\nclass json_pointer {\n    template<typename RefStringTypeRhs>\n    bool operator==(\n        const json_pointer<RefStringTypeRhs>& rhs) const noexcept;  // (1)\n\n    bool operator==(const string_t& rhs) const;                     // (2)\n};\n

    1. Compares two JSON pointers for equality by comparing their reference tokens.

    2. Compares a JSON pointer and a string or a string and a JSON pointer for equality by converting the string to a JSON pointer and comparing the JSON pointers according to 1.

    "},{"location":"api/json_pointer/operator_eq/#template-parameters","title":"Template parameters","text":"RefStringTypeLhs, RefStringTypeRhs the string type of the left-hand side or right-hand side JSON pointer, respectively StringType the string type derived from the json_pointer operand (json_pointer::string_t)"},{"location":"api/json_pointer/operator_eq/#parameters","title":"Parameters","text":"lhs (in) first value to consider rhs (in) second value to consider"},{"location":"api/json_pointer/operator_eq/#return-value","title":"Return value","text":"

    whether the values lhs/*this and rhs are equal

    "},{"location":"api/json_pointer/operator_eq/#exception-safety","title":"Exception safety","text":"
    1. No-throw guarantee: this function never throws exceptions.
    2. Strong exception safety: if an exception occurs, the original value stays intact.
    "},{"location":"api/json_pointer/operator_eq/#exceptions","title":"Exceptions","text":"
    1. (none)
    2. The function can throw the following exceptions:
    3. Throws parse_error.107 if the given JSON pointer s is nonempty and does not begin with a slash (/); see example below.
    4. Throws parse_error.108 if a tilde (~) in the given JSON pointer s is not followed by 0 (representing ~) or 1 (representing /); see example below.
    "},{"location":"api/json_pointer/operator_eq/#complexity","title":"Complexity","text":"

    Constant if lhs and rhs differ in the number of reference tokens, otherwise linear in the number of reference tokens.

    "},{"location":"api/json_pointer/operator_eq/#notes","title":"Notes","text":"

    Deprecation

    Overload 2 is deprecated and will be removed in a future major version release.

    "},{"location":"api/json_pointer/operator_eq/#examples","title":"Examples","text":"Example: (1) Comparing JSON pointers

    The example demonstrates comparing JSON pointers.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // different JSON pointers\n    json::json_pointer ptr0;\n    json::json_pointer ptr1(\"\");\n    json::json_pointer ptr2(\"/foo\");\n\n    // compare JSON pointers\n    std::cout << std::boolalpha\n              << \"\\\"\" << ptr0 << \"\\\" == \\\"\" << ptr0 << \"\\\": \" << (ptr0 == ptr0) << '\\n'\n              << \"\\\"\" << ptr0 << \"\\\" == \\\"\" << ptr1 << \"\\\": \" << (ptr0 == ptr1) << '\\n'\n              << \"\\\"\" << ptr1 << \"\\\" == \\\"\" << ptr2 << \"\\\": \" << (ptr1 == ptr2) << '\\n'\n              << \"\\\"\" << ptr2 << \"\\\" == \\\"\" << ptr2 << \"\\\": \" << (ptr2 == ptr2) << std::endl;\n}\n

    Output:

    \"\" == \"\": true\n\"\" == \"\": true\n\"\" == \"/foo\": false\n\"/foo\" == \"/foo\": true\n
    Example: (2) Comparing JSON pointers and strings

    The example demonstrates comparing JSON pointers and strings, and when doing so may raise an exception.

    #include <exception>\n#include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // different JSON pointers\n    json::json_pointer ptr0;\n    json::json_pointer ptr1(\"\");\n    json::json_pointer ptr2(\"/foo\");\n\n    // different strings\n    std::string str0(\"\");\n    std::string str1(\"/foo\");\n    std::string str2(\"bar\");\n\n    // compare JSON pointers and strings\n    std::cout << std::boolalpha\n              << \"\\\"\" << ptr0 << \"\\\" == \\\"\" << str0 << \"\\\": \" << (ptr0 == str0) << '\\n'\n              << \"\\\"\" << str0 << \"\\\" == \\\"\" << ptr1 << \"\\\": \" << (str0 == ptr1) << '\\n'\n              << \"\\\"\" << ptr2 << \"\\\" == \\\"\" << str1 << \"\\\": \" << (ptr2 == str1) << std::endl;\n\n    try\n    {\n        std::cout << \"\\\"\" << str2 << \"\\\" == \\\"\" << ptr2 << \"\\\": \" << (str2 == ptr2) << std::endl;\n    }\n    catch (const json::parse_error& ex)\n    {\n        std::cout << ex.what() << std::endl;\n    }\n}\n

    Output:

    \"\" == \"\": true\n\"\" == \"\": true\n\"/foo\" == \"/foo\": true\n\"bar\" == \"/foo\": [json.exception.parse_error.107] parse error at byte 1: JSON pointer must be empty or begin with '/' - was: 'bar'\n
    "},{"location":"api/json_pointer/operator_eq/#version-history","title":"Version history","text":"
    1. Added in version 2.1.0. Added C++20 member functions in version 3.11.2.
    2. Added for backward compatibility and deprecated in version 3.11.2.
    "},{"location":"api/json_pointer/operator_ne/","title":"nlohmann::json_pointer::operator!=","text":"
    // until C++20\ntemplate<typename RefStringTypeLhs, typename RefStringTypeRhs>\nbool operator!=(\n    const json_pointer<RefStringTypeLhs>& lhs,\n    const json_pointer<RefStringTypeRhs>& rhs) noexcept;  // (1)\n\ntemplate<typename RefStringTypeLhs, typename StringType>\nbool operator!=(\n    const json_pointer<RefStringTypeLhs>& lhs,\n    const StringType& rhs);                               // (2)\n\ntemplate<typename RefStringTypeRhs, typename StringType>\nbool operator!=(\n    const StringType& lhs,\n    const json_pointer<RefStringTypeRhs>& rhs);           // (2)\n

    1. Compares two JSON pointers for inequality by comparing their reference tokens.

    2. Compares a JSON pointer and a string or a string and a JSON pointer for inequality by converting the string to a JSON pointer and comparing the JSON pointers according to 1.

    "},{"location":"api/json_pointer/operator_ne/#template-parameters","title":"Template parameters","text":"RefStringTypeLhs, RefStringTypeRhs the string type of the left-hand side or right-hand side JSON pointer, respectively StringType the string type derived from the json_pointer operand (json_pointer::string_t)"},{"location":"api/json_pointer/operator_ne/#parameters","title":"Parameters","text":"lhs (in) first value to consider rhs (in) second value to consider"},{"location":"api/json_pointer/operator_ne/#return-value","title":"Return value","text":"

    whether the values lhs/*this and rhs are not equal

    "},{"location":"api/json_pointer/operator_ne/#exception-safety","title":"Exception safety","text":"
    1. No-throw guarantee: this function never throws exceptions.
    2. Strong exception safety: if an exception occurs, the original value stays intact.
    "},{"location":"api/json_pointer/operator_ne/#exceptions","title":"Exceptions","text":"
    1. (none)
    2. The function can throw the following exceptions:
    3. Throws parse_error.107 if the given JSON pointer s is nonempty and does not begin with a slash (/); see example below.
    4. Throws parse_error.108 if a tilde (~) in the given JSON pointer s is not followed by 0 (representing ~) or 1 (representing /); see example below.
    "},{"location":"api/json_pointer/operator_ne/#complexity","title":"Complexity","text":"

    Constant if lhs and rhs differ in the number of reference tokens, otherwise linear in the number of reference tokens.

    "},{"location":"api/json_pointer/operator_ne/#notes","title":"Notes","text":"

    Operator overload resolution

    Since C++20 overload resolution will consider the rewritten candidate generated from operator==.

    Deprecation

    Overload 2 is deprecated and will be removed in a future major version release.

    "},{"location":"api/json_pointer/operator_ne/#examples","title":"Examples","text":"Example: (1) Comparing JSON pointers

    The example demonstrates comparing JSON pointers.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // different JSON pointers\n    json::json_pointer ptr0;\n    json::json_pointer ptr1(\"\");\n    json::json_pointer ptr2(\"/foo\");\n\n    // compare JSON pointers\n    std::cout << std::boolalpha\n              << \"\\\"\" << ptr0 << \"\\\" != \\\"\" << ptr0 << \"\\\": \" << (ptr0 != ptr0) << '\\n'\n              << \"\\\"\" << ptr0 << \"\\\" != \\\"\" << ptr1 << \"\\\": \" << (ptr0 != ptr1) << '\\n'\n              << \"\\\"\" << ptr1 << \"\\\" != \\\"\" << ptr2 << \"\\\": \" << (ptr1 != ptr2) << '\\n'\n              << \"\\\"\" << ptr2 << \"\\\" != \\\"\" << ptr2 << \"\\\": \" << (ptr2 != ptr2) << std::endl;\n}\n

    Output:

    \"\" != \"\": false\n\"\" != \"\": false\n\"\" != \"/foo\": true\n\"/foo\" != \"/foo\": false\n
    Example: (2) Comparing JSON pointers and strings

    The example demonstrates comparing JSON pointers and strings, and when doing so may raise an exception.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // different JSON pointers\n    json::json_pointer ptr0;\n    json::json_pointer ptr1(\"\");\n    json::json_pointer ptr2(\"/foo\");\n\n    // different strings\n    std::string str0(\"\");\n    std::string str1(\"/foo\");\n    std::string str2(\"bar\");\n\n    // compare JSON pointers and strings\n    std::cout << std::boolalpha\n              << \"\\\"\" << ptr0 << \"\\\" != \\\"\" << str0 << \"\\\": \" << (ptr0 != str0) << '\\n'\n              << \"\\\"\" << str0 << \"\\\" != \\\"\" << ptr1 << \"\\\": \" << (str0 != ptr1) << '\\n'\n              << \"\\\"\" << ptr2 << \"\\\" != \\\"\" << str1 << \"\\\": \" << (ptr2 != str1) << std::endl;\n\n    try\n    {\n        std::cout << \"\\\"\" << str2 << \"\\\" != \\\"\" << ptr2 << \"\\\": \" << (str2 != ptr2) << std::endl;\n    }\n    catch (const json::parse_error& ex)\n    {\n        std::cout << ex.what() << std::endl;\n    }\n}\n

    Output:

    \"\" != \"\": false\n\"\" != \"\": false\n\"/foo\" != \"/foo\": false\n\"bar\" != \"/foo\": [json.exception.parse_error.107] parse error at byte 1: JSON pointer must be empty or begin with '/' - was: 'bar'\n
    "},{"location":"api/json_pointer/operator_ne/#version-history","title":"Version history","text":"
    1. Added in version 2.1.0.
    2. Added for backward compatibility and deprecated in version 3.11.2.
    "},{"location":"api/json_pointer/operator_slash/","title":"nlohmann::json_pointer::operator/","text":"
    // (1)\njson_pointer operator/(const json_pointer& lhs, const json_pointer& rhs);\n\n// (2)\njson_pointer operator/(const json_pointer& lhs, string_t token);\n\n// (3)\njson_pointer operator/(const json_pointer& lhs, std::size_t array_idx);\n
    1. create a new JSON pointer by appending the right JSON pointer at the end of the left JSON pointer
    2. create a new JSON pointer by appending the unescaped token at the end of the JSON pointer
    3. create a new JSON pointer by appending the array-index-token at the end of the JSON pointer
    "},{"location":"api/json_pointer/operator_slash/#parameters","title":"Parameters","text":"lhs (in) JSON pointer rhs (in) JSON pointer to append token (in) reference token to append array_idx (in) array index to append"},{"location":"api/json_pointer/operator_slash/#return-value","title":"Return value","text":"
    1. a new JSON pointer with rhs appended to lhs
    2. a new JSON pointer with unescaped token appended to lhs
    3. a new JSON pointer with array_idx appended to lhs
    "},{"location":"api/json_pointer/operator_slash/#complexity","title":"Complexity","text":"
    1. Linear in the length of lhs and rhs.
    2. Linear in the length of lhs.
    3. Linear in the length of lhs.
    "},{"location":"api/json_pointer/operator_slash/#examples","title":"Examples","text":"Example

    The example shows the usage of operator/.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // create a JSON pointer\n    json::json_pointer ptr(\"/foo\");\n\n    // append a JSON Pointer\n    std::cout << \"\\\"\" << ptr / json::json_pointer(\"/bar/baz\") << \"\\\"\\n\";\n\n    // append a string\n    std::cout << \"\\\"\" << ptr / \"fob\" << \"\\\"\\n\";\n\n    // append an array index\n    std::cout << \"\\\"\" << ptr / 42 << \"\\\"\" << std::endl;\n}\n

    Output:

    \"/foo/bar/baz\"\n\"/foo/fob\"\n\"/foo/42\"\n
    "},{"location":"api/json_pointer/operator_slash/#version-history","title":"Version history","text":"
    1. Added in version 3.6.0.
    2. Added in version 3.6.0. Changed type of token to string_t in version 3.11.0.
    3. Added in version 3.6.0.
    "},{"location":"api/json_pointer/operator_slasheq/","title":"nlohmann::json_pointer::operator/=","text":"
    // (1)\njson_pointer& operator/=(const json_pointer& ptr);\n\n// (2)\njson_pointer& operator/=(string_t token);\n\n// (3)\njson_pointer& operator/=(std::size_t array_idx)\n
    1. append another JSON pointer at the end of this JSON pointer
    2. append an unescaped reference token at the end of this JSON pointer
    3. append an array index at the end of this JSON pointer
    "},{"location":"api/json_pointer/operator_slasheq/#parameters","title":"Parameters","text":"ptr (in) JSON pointer to append token (in) reference token to append array_idx (in) array index to append"},{"location":"api/json_pointer/operator_slasheq/#return-value","title":"Return value","text":"
    1. JSON pointer with ptr appended
    2. JSON pointer with token appended without escaping token
    3. JSON pointer with array_idx appended
    "},{"location":"api/json_pointer/operator_slasheq/#complexity","title":"Complexity","text":"
    1. Linear in the length of ptr.
    2. Amortized constant.
    3. Amortized constant.
    "},{"location":"api/json_pointer/operator_slasheq/#examples","title":"Examples","text":"Example

    The example shows the usage of operator/=.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // create a JSON pointer\n    json::json_pointer ptr(\"/foo\");\n    std::cout << \"\\\"\" << ptr << \"\\\"\\n\";\n\n    // append a JSON Pointer\n    ptr /= json::json_pointer(\"/bar/baz\");\n    std::cout << \"\\\"\" << ptr << \"\\\"\\n\";\n\n    // append a string\n    ptr /= \"fob\";\n    std::cout << \"\\\"\" << ptr << \"\\\"\\n\";\n\n    // append an array index\n    ptr /= 42;\n    std::cout << \"\\\"\" << ptr << \"\\\"\" << std::endl;\n}\n

    Output:

    \"/foo\"\n\"/foo/bar/baz\"\n\"/foo/bar/baz/fob\"\n\"/foo/bar/baz/fob/42\"\n
    "},{"location":"api/json_pointer/operator_slasheq/#version-history","title":"Version history","text":"
    1. Added in version 3.6.0.
    2. Added in version 3.6.0. Changed type of token to string_t in version 3.11.0.
    3. Added in version 3.6.0.
    "},{"location":"api/json_pointer/operator_string_t/","title":"nlohmann::json_pointer::operator string_t","text":"
    operator string_t() const\n

    Return a string representation of the JSON pointer.

    "},{"location":"api/json_pointer/operator_string_t/#return-value","title":"Return value","text":"

    A string representation of the JSON pointer

    "},{"location":"api/json_pointer/operator_string_t/#possible-implementation","title":"Possible implementation","text":"
    operator string_t() const\n{\n    return to_string();\n}\n
    "},{"location":"api/json_pointer/operator_string_t/#notes","title":"Notes","text":"

    Deprecation

    This function is deprecated in favor of to_string and will be removed in a future major version release.

    "},{"location":"api/json_pointer/operator_string_t/#examples","title":"Examples","text":"Example

    The example shows how JSON Pointers can be implicitly converted to strings.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // different JSON Pointers\n    json::json_pointer ptr1(\"/foo/0\");\n    json::json_pointer ptr2(\"/a~1b\");\n\n    // implicit conversion to string\n    std::string s;\n    s += ptr1;\n    s += \"\\n\";\n    s += ptr2;\n\n    std::cout << s << std::endl;\n}\n

    Output:

    /foo/0\n/a~1b\n
    "},{"location":"api/json_pointer/operator_string_t/#see-also","title":"See also","text":"
    • string_t- type for strings
    "},{"location":"api/json_pointer/operator_string_t/#version-history","title":"Version history","text":"
    • Since version 2.0.0.
    • Changed type to string_t and deprecated in version 3.11.0.
    "},{"location":"api/json_pointer/parent_pointer/","title":"nlohmann::json_pointer::parent_pointer","text":"
    json_pointer parent_pointer() const;\n

    Returns the parent of this JSON pointer.

    "},{"location":"api/json_pointer/parent_pointer/#return-value","title":"Return value","text":"

    Parent of this JSON pointer; in case this JSON pointer is the root, the root itself is returned.

    "},{"location":"api/json_pointer/parent_pointer/#complexity","title":"Complexity","text":"

    Linear in the length of the JSON pointer.

    "},{"location":"api/json_pointer/parent_pointer/#examples","title":"Examples","text":"Example

    The example shows the result of parent_pointer for different JSON Pointers.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // different JSON Pointers\n    json::json_pointer ptr1(\"\");\n    json::json_pointer ptr2(\"/foo\");\n    json::json_pointer ptr3(\"/foo/0\");\n\n    // call parent_pointer()\n    std::cout << std::boolalpha\n              << \"parent of \\\"\" << ptr1 << \"\\\" is \\\"\" << ptr1.parent_pointer() << \"\\\"\\n\"\n              << \"parent of \\\"\" << ptr2 << \"\\\" is \\\"\" << ptr2.parent_pointer() << \"\\\"\\n\"\n              << \"parent of \\\"\" << ptr3 << \"\\\" is \\\"\" << ptr3.parent_pointer() << \"\\\"\" << std::endl;\n}\n

    Output:

    parent of \"\" is \"\"\nparent of \"/foo\" is \"\"\nparent of \"/foo/0\" is \"/foo\"\n
    "},{"location":"api/json_pointer/parent_pointer/#version-history","title":"Version history","text":"

    Added in version 3.6.0.

    "},{"location":"api/json_pointer/pop_back/","title":"nlohmann::json_pointer::pop_back","text":"
    void pop_back();\n

    Remove the last reference token.

    "},{"location":"api/json_pointer/pop_back/#exceptions","title":"Exceptions","text":"

    Throws out_of_range.405 if the JSON pointer has no parent.

    "},{"location":"api/json_pointer/pop_back/#complexity","title":"Complexity","text":"

    Constant.

    "},{"location":"api/json_pointer/pop_back/#examples","title":"Examples","text":"Example

    The example shows the usage of pop_back.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // create empty JSON Pointer\n    json::json_pointer ptr(\"/foo/bar/baz\");\n    std::cout << \"\\\"\" << ptr << \"\\\"\\n\";\n\n    // call pop_back()\n    ptr.pop_back();\n    std::cout << \"\\\"\" << ptr << \"\\\"\\n\";\n\n    ptr.pop_back();\n    std::cout << \"\\\"\" << ptr << \"\\\"\\n\";\n\n    ptr.pop_back();\n    std::cout << \"\\\"\" << ptr << \"\\\"\\n\";\n}\n

    Output:

    \"/foo/bar/baz\"\n\"/foo/bar\"\n\"/foo\"\n\"\"\n
    "},{"location":"api/json_pointer/pop_back/#version-history","title":"Version history","text":"

    Added in version 3.6.0.

    "},{"location":"api/json_pointer/push_back/","title":"nlohmann::json_pointer::push_back","text":"
    void push_back(const string_t& token);\n\nvoid push_back(string_t&& token);\n

    Append an unescaped token at the end of the reference pointer.

    "},{"location":"api/json_pointer/push_back/#parameters","title":"Parameters","text":"token (in) token to add"},{"location":"api/json_pointer/push_back/#complexity","title":"Complexity","text":"

    Amortized constant.

    "},{"location":"api/json_pointer/push_back/#examples","title":"Examples","text":"Example

    The example shows the result of push_back for different JSON Pointers.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // create empty JSON Pointer\n    json::json_pointer ptr;\n    std::cout << \"\\\"\" << ptr << \"\\\"\\n\";\n\n    // call push_back()\n    ptr.push_back(\"foo\");\n    std::cout << \"\\\"\" << ptr << \"\\\"\\n\";\n\n    ptr.push_back(\"0\");\n    std::cout << \"\\\"\" << ptr << \"\\\"\\n\";\n\n    ptr.push_back(\"bar\");\n    std::cout << \"\\\"\" << ptr << \"\\\"\\n\";\n}\n

    Output:

    \"\"\n\"/foo\"\n\"/foo/0\"\n\"/foo/0/bar\"\n
    "},{"location":"api/json_pointer/push_back/#version-history","title":"Version history","text":"
    • Added in version 3.6.0.
    • Changed type of token to string_t in version 3.11.0.
    "},{"location":"api/json_pointer/string_t/","title":"nlohmann::json_pointer::string_t","text":"
    using string_t = RefStringType;\n

    The string type used for the reference tokens making up the JSON pointer.

    See basic_json::string_t for more information.

    "},{"location":"api/json_pointer/string_t/#examples","title":"Examples","text":"Example

    The example shows the type string_t and its relation to basic_json::string_t.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    json::json_pointer::string_t s = \"This is a string.\";\n\n    std::cout << s << std::endl;\n\n    std::cout << std::boolalpha << std::is_same<json::json_pointer::string_t, json::string_t>::value << std::endl;\n}\n

    Output:

    This is a string.\ntrue\n
    "},{"location":"api/json_pointer/string_t/#version-history","title":"Version history","text":"
    • Added in version 3.11.0.
    "},{"location":"api/json_pointer/to_string/","title":"nlohmann::json_pointer::to_string","text":"
    string_t to_string() const;\n

    Return a string representation of the JSON pointer.

    "},{"location":"api/json_pointer/to_string/#return-value","title":"Return value","text":"

    A string representation of the JSON pointer

    "},{"location":"api/json_pointer/to_string/#notes","title":"Notes","text":"

    For each JSON pointer ptr, it holds:

    ptr == json_pointer(ptr.to_string());\n
    "},{"location":"api/json_pointer/to_string/#examples","title":"Examples","text":"Example

    The example shows the result of to_string.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // different JSON Pointers\n    json::json_pointer ptr1(\"\");\n    json::json_pointer ptr2(\"/foo\");\n    json::json_pointer ptr3(\"/foo/0\");\n    json::json_pointer ptr4(\"/\");\n    json::json_pointer ptr5(\"/a~1b\");\n    json::json_pointer ptr6(\"/c%d\");\n    json::json_pointer ptr7(\"/e^f\");\n    json::json_pointer ptr8(\"/g|h\");\n    json::json_pointer ptr9(\"/i\\\\j\");\n    json::json_pointer ptr10(\"/k\\\"l\");\n    json::json_pointer ptr11(\"/ \");\n    json::json_pointer ptr12(\"/m~0n\");\n\n    std::cout << \"\\\"\" << ptr1.to_string() << \"\\\"\\n\"\n              << \"\\\"\" << ptr2.to_string() << \"\\\"\\n\"\n              << \"\\\"\" << ptr3.to_string() << \"\\\"\\n\"\n              << \"\\\"\" << ptr4.to_string() << \"\\\"\\n\"\n              << \"\\\"\" << ptr5.to_string() << \"\\\"\\n\"\n              << \"\\\"\" << ptr6.to_string() << \"\\\"\\n\"\n              << \"\\\"\" << ptr7.to_string() << \"\\\"\\n\"\n              << \"\\\"\" << ptr8.to_string() << \"\\\"\\n\"\n              << \"\\\"\" << ptr9.to_string() << \"\\\"\\n\"\n              << \"\\\"\" << ptr10.to_string() << \"\\\"\\n\"\n              << \"\\\"\" << ptr11.to_string() << \"\\\"\\n\"\n              << \"\\\"\" << ptr12.to_string() << \"\\\"\" << std::endl;\n}\n

    Output:

    \"\"\n\"/foo\"\n\"/foo/0\"\n\"/\"\n\"/a~1b\"\n\"/c%d\"\n\"/e^f\"\n\"/g|h\"\n\"/i\\j\"\n\"/k\"l\"\n\"/ \"\n\"/m~0n\"\n
    "},{"location":"api/json_pointer/to_string/#version-history","title":"Version history","text":"
    • Since version 2.0.0.
    • Changed return type to string_t in version 3.11.0.
    "},{"location":"api/json_sax/","title":"nlohmann::json_sax","text":"
    template<typename BasicJsonType>\nstruct json_sax;\n

    This class describes the SAX interface used by sax_parse. Each function is called in different situations while the input is parsed. The boolean return value informs the parser whether to continue processing the input.

    "},{"location":"api/json_sax/#template-parameters","title":"Template parameters","text":"BasicJsonType a specialization of basic_json"},{"location":"api/json_sax/#member-types","title":"Member types","text":"
    • number_integer_t - BasicJsonType's type for numbers (integer)
    • number_unsigned_t - BasicJsonType's type for numbers (unsigned)
    • number_float_t - BasicJsonType's type for numbers (floating-point)
    • string_t - BasicJsonType's type for strings
    • binary_t - BasicJsonType's type for binary arrays
    "},{"location":"api/json_sax/#member-functions","title":"Member functions","text":"
    • binary (virtual) - a binary value was read
    • boolean (virtual) - a boolean value was read
    • end_array (virtual) - the end of an array was read
    • end_object (virtual) - the end of an object was read
    • key (virtual) - an object key was read
    • null (virtual) - a null value was read
    • number_float (virtual) - a floating-point number was read
    • number_integer (virtual) - an integer number was read
    • number_unsigned (virtual) - an unsigned integer number was read
    • parse_error (virtual) - a parse error occurred
    • start_array (virtual) - the beginning of an array was read
    • start_object (virtual) - the beginning of an object was read
    • string (virtual) - a string value was read
    "},{"location":"api/json_sax/#version-history","title":"Version history","text":"
    • Added in version 3.2.0.
    • Support for binary values (binary_t, binary) added in version 3.8.0.
    "},{"location":"api/json_sax/binary/","title":"nlohmann::json_sax::binary","text":"
    virtual bool binary(binary_t& val) = 0;\n

    A binary value was read.

    "},{"location":"api/json_sax/binary/#parameters","title":"Parameters","text":"val (in) binary value"},{"location":"api/json_sax/binary/#return-value","title":"Return value","text":"

    Whether parsing should proceed.

    "},{"location":"api/json_sax/binary/#notes","title":"Notes","text":"

    It is safe to move the passed binary value.

    "},{"location":"api/json_sax/binary/#examples","title":"Examples","text":"Example

    The example below shows how the SAX interface is used.

    #include <iostream>\n#include <iomanip>\n#include <sstream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\n// a simple event consumer that collects string representations of the passed\n// values; note inheriting from json::json_sax_t is not required, but can\n// help not to forget a required function\nclass sax_event_consumer : public json::json_sax_t\n{\n  public:\n    std::vector<std::string> events;\n\n    bool null() override\n    {\n        events.push_back(\"null()\");\n        return true;\n    }\n\n    bool boolean(bool val) override\n    {\n        events.push_back(\"boolean(val=\" + std::string(val ? \"true\" : \"false\") + \")\");\n        return true;\n    }\n\n    bool number_integer(number_integer_t val) override\n    {\n        events.push_back(\"number_integer(val=\" + std::to_string(val) + \")\");\n        return true;\n    }\n\n    bool number_unsigned(number_unsigned_t val) override\n    {\n        events.push_back(\"number_unsigned(val=\" + std::to_string(val) + \")\");\n        return true;\n    }\n\n    bool number_float(number_float_t val, const string_t& s) override\n    {\n        events.push_back(\"number_float(val=\" + std::to_string(val) + \", s=\" + s + \")\");\n        return true;\n    }\n\n    bool string(string_t& val) override\n    {\n        events.push_back(\"string(val=\" + val + \")\");\n        return true;\n    }\n\n    bool start_object(std::size_t elements) override\n    {\n        events.push_back(\"start_object(elements=\" + std::to_string(elements) + \")\");\n        return true;\n    }\n\n    bool end_object() override\n    {\n        events.push_back(\"end_object()\");\n        return true;\n    }\n\n    bool start_array(std::size_t elements) override\n    {\n        events.push_back(\"start_array(elements=\" + std::to_string(elements) + \")\");\n        return true;\n    }\n\n    bool end_array() override\n    {\n        events.push_back(\"end_array()\");\n        return true;\n    }\n\n    bool key(string_t& val) override\n    {\n        events.push_back(\"key(val=\" + val + \")\");\n        return true;\n    }\n\n    bool binary(json::binary_t& val) override\n    {\n        events.push_back(\"binary(val=[...])\");\n        return true;\n    }\n\n    bool parse_error(std::size_t position, const std::string& last_token, const json::exception& ex) override\n    {\n        events.push_back(\"parse_error(position=\" + std::to_string(position) + \", last_token=\" + last_token + \",\\n            ex=\" + std::string(ex.what()) + \")\");\n        return false;\n    }\n};\n\nint main()\n{\n    // CBOR byte string\n    std::vector<std::uint8_t> vec = {{0x44, 0xcA, 0xfe, 0xba, 0xbe}};\n\n    // create a SAX event consumer object\n    sax_event_consumer sec;\n\n    // parse CBOR\n    bool result = json::sax_parse(vec, &sec, json::input_format_t::cbor);\n\n    // output the recorded events\n    for (auto& event : sec.events)\n    {\n        std::cout << event << \"\\n\";\n    }\n\n    // output the result of sax_parse\n    std::cout << \"\\nresult: \" << std::boolalpha << result << std::endl;\n}\n

    Output:

    binary(val=[...])\n\nresult: true\n
    "},{"location":"api/json_sax/binary/#version-history","title":"Version history","text":"
    • Added in version 3.8.0.
    "},{"location":"api/json_sax/boolean/","title":"nlohmann::json_sax::boolean","text":"
    virtual bool boolean(bool val) = 0;\n

    A boolean value was read.

    "},{"location":"api/json_sax/boolean/#parameters","title":"Parameters","text":"val (in) boolean value"},{"location":"api/json_sax/boolean/#return-value","title":"Return value","text":"

    Whether parsing should proceed.

    "},{"location":"api/json_sax/boolean/#examples","title":"Examples","text":"Example

    The example below shows how the SAX interface is used.

    #include <iostream>\n#include <iomanip>\n#include <sstream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\n// a simple event consumer that collects string representations of the passed\n// values; note inheriting from json::json_sax_t is not required, but can\n// help not to forget a required function\nclass sax_event_consumer : public json::json_sax_t\n{\n  public:\n    std::vector<std::string> events;\n\n    bool null() override\n    {\n        events.push_back(\"null()\");\n        return true;\n    }\n\n    bool boolean(bool val) override\n    {\n        events.push_back(\"boolean(val=\" + std::string(val ? \"true\" : \"false\") + \")\");\n        return true;\n    }\n\n    bool number_integer(number_integer_t val) override\n    {\n        events.push_back(\"number_integer(val=\" + std::to_string(val) + \")\");\n        return true;\n    }\n\n    bool number_unsigned(number_unsigned_t val) override\n    {\n        events.push_back(\"number_unsigned(val=\" + std::to_string(val) + \")\");\n        return true;\n    }\n\n    bool number_float(number_float_t val, const string_t& s) override\n    {\n        events.push_back(\"number_float(val=\" + std::to_string(val) + \", s=\" + s + \")\");\n        return true;\n    }\n\n    bool string(string_t& val) override\n    {\n        events.push_back(\"string(val=\" + val + \")\");\n        return true;\n    }\n\n    bool start_object(std::size_t elements) override\n    {\n        events.push_back(\"start_object(elements=\" + std::to_string(elements) + \")\");\n        return true;\n    }\n\n    bool end_object() override\n    {\n        events.push_back(\"end_object()\");\n        return true;\n    }\n\n    bool start_array(std::size_t elements) override\n    {\n        events.push_back(\"start_array(elements=\" + std::to_string(elements) + \")\");\n        return true;\n    }\n\n    bool end_array() override\n    {\n        events.push_back(\"end_array()\");\n        return true;\n    }\n\n    bool key(string_t& val) override\n    {\n        events.push_back(\"key(val=\" + val + \")\");\n        return true;\n    }\n\n    bool binary(json::binary_t& val) override\n    {\n        events.push_back(\"binary(val=[...])\");\n        return true;\n    }\n\n    bool parse_error(std::size_t position, const std::string& last_token, const json::exception& ex) override\n    {\n        events.push_back(\"parse_error(position=\" + std::to_string(position) + \", last_token=\" + last_token + \",\\n            ex=\" + std::string(ex.what()) + \")\");\n        return false;\n    }\n};\n\nint main()\n{\n    // a JSON text\n    auto text = R\"(\n    {\n        \"Image\": {\n            \"Width\":  800,\n            \"Height\": 600,\n            \"Title\":  \"View from 15th Floor\",\n            \"Thumbnail\": {\n                \"Url\":    \"http://www.example.com/image/481989943\",\n                \"Height\": 125,\n                \"Width\":  100\n            },\n            \"Animated\" : false,\n            \"IDs\": [116, 943, 234, -38793],\n            \"DeletionDate\": null,\n            \"Distance\": 12.723374634\n        }\n    }]\n    )\";\n\n    // create a SAX event consumer object\n    sax_event_consumer sec;\n\n    // parse JSON\n    bool result = json::sax_parse(text, &sec);\n\n    // output the recorded events\n    for (auto& event : sec.events)\n    {\n        std::cout << event << \"\\n\";\n    }\n\n    // output the result of sax_parse\n    std::cout << \"\\nresult: \" << std::boolalpha << result << std::endl;\n}\n

    Output:

    start_object(elements=18446744073709551615)\nkey(val=Image)\nstart_object(elements=18446744073709551615)\nkey(val=Width)\nnumber_unsigned(val=800)\nkey(val=Height)\nnumber_unsigned(val=600)\nkey(val=Title)\nstring(val=View from 15th Floor)\nkey(val=Thumbnail)\nstart_object(elements=18446744073709551615)\nkey(val=Url)\nstring(val=http://www.example.com/image/481989943)\nkey(val=Height)\nnumber_unsigned(val=125)\nkey(val=Width)\nnumber_unsigned(val=100)\nend_object()\nkey(val=Animated)\nboolean(val=false)\nkey(val=IDs)\nstart_array(elements=18446744073709551615)\nnumber_unsigned(val=116)\nnumber_unsigned(val=943)\nnumber_unsigned(val=234)\nnumber_integer(val=-38793)\nend_array()\nkey(val=DeletionDate)\nnull()\nkey(val=Distance)\nnumber_float(val=12.723375, s=12.723374634)\nend_object()\nend_object()\nparse_error(position=460, last_token=12.723374634<U+000A>        }<U+000A>    }],\n            ex=[json.exception.parse_error.101] parse error at line 17, column 6: syntax error while parsing value - unexpected ']'; expected end of input)\n\nresult: false\n
    "},{"location":"api/json_sax/boolean/#version-history","title":"Version history","text":"
    • Added in version 3.2.0.
    "},{"location":"api/json_sax/end_array/","title":"nlohmann::json_sax::end_array","text":"
    virtual bool end_array() = 0;\n

    The end of an array was read.

    "},{"location":"api/json_sax/end_array/#return-value","title":"Return value","text":"

    Whether parsing should proceed.

    "},{"location":"api/json_sax/end_array/#examples","title":"Examples","text":"Example

    The example below shows how the SAX interface is used.

    #include <iostream>\n#include <iomanip>\n#include <sstream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\n// a simple event consumer that collects string representations of the passed\n// values; note inheriting from json::json_sax_t is not required, but can\n// help not to forget a required function\nclass sax_event_consumer : public json::json_sax_t\n{\n  public:\n    std::vector<std::string> events;\n\n    bool null() override\n    {\n        events.push_back(\"null()\");\n        return true;\n    }\n\n    bool boolean(bool val) override\n    {\n        events.push_back(\"boolean(val=\" + std::string(val ? \"true\" : \"false\") + \")\");\n        return true;\n    }\n\n    bool number_integer(number_integer_t val) override\n    {\n        events.push_back(\"number_integer(val=\" + std::to_string(val) + \")\");\n        return true;\n    }\n\n    bool number_unsigned(number_unsigned_t val) override\n    {\n        events.push_back(\"number_unsigned(val=\" + std::to_string(val) + \")\");\n        return true;\n    }\n\n    bool number_float(number_float_t val, const string_t& s) override\n    {\n        events.push_back(\"number_float(val=\" + std::to_string(val) + \", s=\" + s + \")\");\n        return true;\n    }\n\n    bool string(string_t& val) override\n    {\n        events.push_back(\"string(val=\" + val + \")\");\n        return true;\n    }\n\n    bool start_object(std::size_t elements) override\n    {\n        events.push_back(\"start_object(elements=\" + std::to_string(elements) + \")\");\n        return true;\n    }\n\n    bool end_object() override\n    {\n        events.push_back(\"end_object()\");\n        return true;\n    }\n\n    bool start_array(std::size_t elements) override\n    {\n        events.push_back(\"start_array(elements=\" + std::to_string(elements) + \")\");\n        return true;\n    }\n\n    bool end_array() override\n    {\n        events.push_back(\"end_array()\");\n        return true;\n    }\n\n    bool key(string_t& val) override\n    {\n        events.push_back(\"key(val=\" + val + \")\");\n        return true;\n    }\n\n    bool binary(json::binary_t& val) override\n    {\n        events.push_back(\"binary(val=[...])\");\n        return true;\n    }\n\n    bool parse_error(std::size_t position, const std::string& last_token, const json::exception& ex) override\n    {\n        events.push_back(\"parse_error(position=\" + std::to_string(position) + \", last_token=\" + last_token + \",\\n            ex=\" + std::string(ex.what()) + \")\");\n        return false;\n    }\n};\n\nint main()\n{\n    // a JSON text\n    auto text = R\"(\n    {\n        \"Image\": {\n            \"Width\":  800,\n            \"Height\": 600,\n            \"Title\":  \"View from 15th Floor\",\n            \"Thumbnail\": {\n                \"Url\":    \"http://www.example.com/image/481989943\",\n                \"Height\": 125,\n                \"Width\":  100\n            },\n            \"Animated\" : false,\n            \"IDs\": [116, 943, 234, -38793],\n            \"DeletionDate\": null,\n            \"Distance\": 12.723374634\n        }\n    }]\n    )\";\n\n    // create a SAX event consumer object\n    sax_event_consumer sec;\n\n    // parse JSON\n    bool result = json::sax_parse(text, &sec);\n\n    // output the recorded events\n    for (auto& event : sec.events)\n    {\n        std::cout << event << \"\\n\";\n    }\n\n    // output the result of sax_parse\n    std::cout << \"\\nresult: \" << std::boolalpha << result << std::endl;\n}\n

    Output:

    start_object(elements=18446744073709551615)\nkey(val=Image)\nstart_object(elements=18446744073709551615)\nkey(val=Width)\nnumber_unsigned(val=800)\nkey(val=Height)\nnumber_unsigned(val=600)\nkey(val=Title)\nstring(val=View from 15th Floor)\nkey(val=Thumbnail)\nstart_object(elements=18446744073709551615)\nkey(val=Url)\nstring(val=http://www.example.com/image/481989943)\nkey(val=Height)\nnumber_unsigned(val=125)\nkey(val=Width)\nnumber_unsigned(val=100)\nend_object()\nkey(val=Animated)\nboolean(val=false)\nkey(val=IDs)\nstart_array(elements=18446744073709551615)\nnumber_unsigned(val=116)\nnumber_unsigned(val=943)\nnumber_unsigned(val=234)\nnumber_integer(val=-38793)\nend_array()\nkey(val=DeletionDate)\nnull()\nkey(val=Distance)\nnumber_float(val=12.723375, s=12.723374634)\nend_object()\nend_object()\nparse_error(position=460, last_token=12.723374634<U+000A>        }<U+000A>    }],\n            ex=[json.exception.parse_error.101] parse error at line 17, column 6: syntax error while parsing value - unexpected ']'; expected end of input)\n\nresult: false\n
    "},{"location":"api/json_sax/end_array/#version-history","title":"Version history","text":"
    • Added in version 3.2.0.
    "},{"location":"api/json_sax/end_object/","title":"nlohmann::json_sax::end_object","text":"
    virtual bool end_object() = 0;\n

    The end of an object was read.

    "},{"location":"api/json_sax/end_object/#return-value","title":"Return value","text":"

    Whether parsing should proceed.

    "},{"location":"api/json_sax/end_object/#examples","title":"Examples","text":"Example

    The example below shows how the SAX interface is used.

    #include <iostream>\n#include <iomanip>\n#include <sstream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\n// a simple event consumer that collects string representations of the passed\n// values; note inheriting from json::json_sax_t is not required, but can\n// help not to forget a required function\nclass sax_event_consumer : public json::json_sax_t\n{\n  public:\n    std::vector<std::string> events;\n\n    bool null() override\n    {\n        events.push_back(\"null()\");\n        return true;\n    }\n\n    bool boolean(bool val) override\n    {\n        events.push_back(\"boolean(val=\" + std::string(val ? \"true\" : \"false\") + \")\");\n        return true;\n    }\n\n    bool number_integer(number_integer_t val) override\n    {\n        events.push_back(\"number_integer(val=\" + std::to_string(val) + \")\");\n        return true;\n    }\n\n    bool number_unsigned(number_unsigned_t val) override\n    {\n        events.push_back(\"number_unsigned(val=\" + std::to_string(val) + \")\");\n        return true;\n    }\n\n    bool number_float(number_float_t val, const string_t& s) override\n    {\n        events.push_back(\"number_float(val=\" + std::to_string(val) + \", s=\" + s + \")\");\n        return true;\n    }\n\n    bool string(string_t& val) override\n    {\n        events.push_back(\"string(val=\" + val + \")\");\n        return true;\n    }\n\n    bool start_object(std::size_t elements) override\n    {\n        events.push_back(\"start_object(elements=\" + std::to_string(elements) + \")\");\n        return true;\n    }\n\n    bool end_object() override\n    {\n        events.push_back(\"end_object()\");\n        return true;\n    }\n\n    bool start_array(std::size_t elements) override\n    {\n        events.push_back(\"start_array(elements=\" + std::to_string(elements) + \")\");\n        return true;\n    }\n\n    bool end_array() override\n    {\n        events.push_back(\"end_array()\");\n        return true;\n    }\n\n    bool key(string_t& val) override\n    {\n        events.push_back(\"key(val=\" + val + \")\");\n        return true;\n    }\n\n    bool binary(json::binary_t& val) override\n    {\n        events.push_back(\"binary(val=[...])\");\n        return true;\n    }\n\n    bool parse_error(std::size_t position, const std::string& last_token, const json::exception& ex) override\n    {\n        events.push_back(\"parse_error(position=\" + std::to_string(position) + \", last_token=\" + last_token + \",\\n            ex=\" + std::string(ex.what()) + \")\");\n        return false;\n    }\n};\n\nint main()\n{\n    // a JSON text\n    auto text = R\"(\n    {\n        \"Image\": {\n            \"Width\":  800,\n            \"Height\": 600,\n            \"Title\":  \"View from 15th Floor\",\n            \"Thumbnail\": {\n                \"Url\":    \"http://www.example.com/image/481989943\",\n                \"Height\": 125,\n                \"Width\":  100\n            },\n            \"Animated\" : false,\n            \"IDs\": [116, 943, 234, -38793],\n            \"DeletionDate\": null,\n            \"Distance\": 12.723374634\n        }\n    }]\n    )\";\n\n    // create a SAX event consumer object\n    sax_event_consumer sec;\n\n    // parse JSON\n    bool result = json::sax_parse(text, &sec);\n\n    // output the recorded events\n    for (auto& event : sec.events)\n    {\n        std::cout << event << \"\\n\";\n    }\n\n    // output the result of sax_parse\n    std::cout << \"\\nresult: \" << std::boolalpha << result << std::endl;\n}\n

    Output:

    start_object(elements=18446744073709551615)\nkey(val=Image)\nstart_object(elements=18446744073709551615)\nkey(val=Width)\nnumber_unsigned(val=800)\nkey(val=Height)\nnumber_unsigned(val=600)\nkey(val=Title)\nstring(val=View from 15th Floor)\nkey(val=Thumbnail)\nstart_object(elements=18446744073709551615)\nkey(val=Url)\nstring(val=http://www.example.com/image/481989943)\nkey(val=Height)\nnumber_unsigned(val=125)\nkey(val=Width)\nnumber_unsigned(val=100)\nend_object()\nkey(val=Animated)\nboolean(val=false)\nkey(val=IDs)\nstart_array(elements=18446744073709551615)\nnumber_unsigned(val=116)\nnumber_unsigned(val=943)\nnumber_unsigned(val=234)\nnumber_integer(val=-38793)\nend_array()\nkey(val=DeletionDate)\nnull()\nkey(val=Distance)\nnumber_float(val=12.723375, s=12.723374634)\nend_object()\nend_object()\nparse_error(position=460, last_token=12.723374634<U+000A>        }<U+000A>    }],\n            ex=[json.exception.parse_error.101] parse error at line 17, column 6: syntax error while parsing value - unexpected ']'; expected end of input)\n\nresult: false\n
    "},{"location":"api/json_sax/end_object/#version-history","title":"Version history","text":"
    • Added in version 3.2.0.
    "},{"location":"api/json_sax/key/","title":"nlohmann::json_sax::key","text":"
    virtual bool key(string_t& val) = 0;\n

    An object key was read.

    "},{"location":"api/json_sax/key/#parameters","title":"Parameters","text":"val (in) object key"},{"location":"api/json_sax/key/#return-value","title":"Return value","text":"

    Whether parsing should proceed.

    "},{"location":"api/json_sax/key/#notes","title":"Notes","text":"

    It is safe to move the passed object key value.

    "},{"location":"api/json_sax/key/#examples","title":"Examples","text":"Example

    The example below shows how the SAX interface is used.

    #include <iostream>\n#include <iomanip>\n#include <sstream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\n// a simple event consumer that collects string representations of the passed\n// values; note inheriting from json::json_sax_t is not required, but can\n// help not to forget a required function\nclass sax_event_consumer : public json::json_sax_t\n{\n  public:\n    std::vector<std::string> events;\n\n    bool null() override\n    {\n        events.push_back(\"null()\");\n        return true;\n    }\n\n    bool boolean(bool val) override\n    {\n        events.push_back(\"boolean(val=\" + std::string(val ? \"true\" : \"false\") + \")\");\n        return true;\n    }\n\n    bool number_integer(number_integer_t val) override\n    {\n        events.push_back(\"number_integer(val=\" + std::to_string(val) + \")\");\n        return true;\n    }\n\n    bool number_unsigned(number_unsigned_t val) override\n    {\n        events.push_back(\"number_unsigned(val=\" + std::to_string(val) + \")\");\n        return true;\n    }\n\n    bool number_float(number_float_t val, const string_t& s) override\n    {\n        events.push_back(\"number_float(val=\" + std::to_string(val) + \", s=\" + s + \")\");\n        return true;\n    }\n\n    bool string(string_t& val) override\n    {\n        events.push_back(\"string(val=\" + val + \")\");\n        return true;\n    }\n\n    bool start_object(std::size_t elements) override\n    {\n        events.push_back(\"start_object(elements=\" + std::to_string(elements) + \")\");\n        return true;\n    }\n\n    bool end_object() override\n    {\n        events.push_back(\"end_object()\");\n        return true;\n    }\n\n    bool start_array(std::size_t elements) override\n    {\n        events.push_back(\"start_array(elements=\" + std::to_string(elements) + \")\");\n        return true;\n    }\n\n    bool end_array() override\n    {\n        events.push_back(\"end_array()\");\n        return true;\n    }\n\n    bool key(string_t& val) override\n    {\n        events.push_back(\"key(val=\" + val + \")\");\n        return true;\n    }\n\n    bool binary(json::binary_t& val) override\n    {\n        events.push_back(\"binary(val=[...])\");\n        return true;\n    }\n\n    bool parse_error(std::size_t position, const std::string& last_token, const json::exception& ex) override\n    {\n        events.push_back(\"parse_error(position=\" + std::to_string(position) + \", last_token=\" + last_token + \",\\n            ex=\" + std::string(ex.what()) + \")\");\n        return false;\n    }\n};\n\nint main()\n{\n    // a JSON text\n    auto text = R\"(\n    {\n        \"Image\": {\n            \"Width\":  800,\n            \"Height\": 600,\n            \"Title\":  \"View from 15th Floor\",\n            \"Thumbnail\": {\n                \"Url\":    \"http://www.example.com/image/481989943\",\n                \"Height\": 125,\n                \"Width\":  100\n            },\n            \"Animated\" : false,\n            \"IDs\": [116, 943, 234, -38793],\n            \"DeletionDate\": null,\n            \"Distance\": 12.723374634\n        }\n    }]\n    )\";\n\n    // create a SAX event consumer object\n    sax_event_consumer sec;\n\n    // parse JSON\n    bool result = json::sax_parse(text, &sec);\n\n    // output the recorded events\n    for (auto& event : sec.events)\n    {\n        std::cout << event << \"\\n\";\n    }\n\n    // output the result of sax_parse\n    std::cout << \"\\nresult: \" << std::boolalpha << result << std::endl;\n}\n

    Output:

    start_object(elements=18446744073709551615)\nkey(val=Image)\nstart_object(elements=18446744073709551615)\nkey(val=Width)\nnumber_unsigned(val=800)\nkey(val=Height)\nnumber_unsigned(val=600)\nkey(val=Title)\nstring(val=View from 15th Floor)\nkey(val=Thumbnail)\nstart_object(elements=18446744073709551615)\nkey(val=Url)\nstring(val=http://www.example.com/image/481989943)\nkey(val=Height)\nnumber_unsigned(val=125)\nkey(val=Width)\nnumber_unsigned(val=100)\nend_object()\nkey(val=Animated)\nboolean(val=false)\nkey(val=IDs)\nstart_array(elements=18446744073709551615)\nnumber_unsigned(val=116)\nnumber_unsigned(val=943)\nnumber_unsigned(val=234)\nnumber_integer(val=-38793)\nend_array()\nkey(val=DeletionDate)\nnull()\nkey(val=Distance)\nnumber_float(val=12.723375, s=12.723374634)\nend_object()\nend_object()\nparse_error(position=460, last_token=12.723374634<U+000A>        }<U+000A>    }],\n            ex=[json.exception.parse_error.101] parse error at line 17, column 6: syntax error while parsing value - unexpected ']'; expected end of input)\n\nresult: false\n
    "},{"location":"api/json_sax/key/#version-history","title":"Version history","text":"
    • Added in version 3.2.0.
    "},{"location":"api/json_sax/null/","title":"nlohmann::json_sax::null","text":"
    virtual bool null() = 0;\n

    A null value was read.

    "},{"location":"api/json_sax/null/#return-value","title":"Return value","text":"

    Whether parsing should proceed.

    "},{"location":"api/json_sax/null/#examples","title":"Examples","text":"Example

    The example below shows how the SAX interface is used.

    #include <iostream>\n#include <iomanip>\n#include <sstream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\n// a simple event consumer that collects string representations of the passed\n// values; note inheriting from json::json_sax_t is not required, but can\n// help not to forget a required function\nclass sax_event_consumer : public json::json_sax_t\n{\n  public:\n    std::vector<std::string> events;\n\n    bool null() override\n    {\n        events.push_back(\"null()\");\n        return true;\n    }\n\n    bool boolean(bool val) override\n    {\n        events.push_back(\"boolean(val=\" + std::string(val ? \"true\" : \"false\") + \")\");\n        return true;\n    }\n\n    bool number_integer(number_integer_t val) override\n    {\n        events.push_back(\"number_integer(val=\" + std::to_string(val) + \")\");\n        return true;\n    }\n\n    bool number_unsigned(number_unsigned_t val) override\n    {\n        events.push_back(\"number_unsigned(val=\" + std::to_string(val) + \")\");\n        return true;\n    }\n\n    bool number_float(number_float_t val, const string_t& s) override\n    {\n        events.push_back(\"number_float(val=\" + std::to_string(val) + \", s=\" + s + \")\");\n        return true;\n    }\n\n    bool string(string_t& val) override\n    {\n        events.push_back(\"string(val=\" + val + \")\");\n        return true;\n    }\n\n    bool start_object(std::size_t elements) override\n    {\n        events.push_back(\"start_object(elements=\" + std::to_string(elements) + \")\");\n        return true;\n    }\n\n    bool end_object() override\n    {\n        events.push_back(\"end_object()\");\n        return true;\n    }\n\n    bool start_array(std::size_t elements) override\n    {\n        events.push_back(\"start_array(elements=\" + std::to_string(elements) + \")\");\n        return true;\n    }\n\n    bool end_array() override\n    {\n        events.push_back(\"end_array()\");\n        return true;\n    }\n\n    bool key(string_t& val) override\n    {\n        events.push_back(\"key(val=\" + val + \")\");\n        return true;\n    }\n\n    bool binary(json::binary_t& val) override\n    {\n        events.push_back(\"binary(val=[...])\");\n        return true;\n    }\n\n    bool parse_error(std::size_t position, const std::string& last_token, const json::exception& ex) override\n    {\n        events.push_back(\"parse_error(position=\" + std::to_string(position) + \", last_token=\" + last_token + \",\\n            ex=\" + std::string(ex.what()) + \")\");\n        return false;\n    }\n};\n\nint main()\n{\n    // a JSON text\n    auto text = R\"(\n    {\n        \"Image\": {\n            \"Width\":  800,\n            \"Height\": 600,\n            \"Title\":  \"View from 15th Floor\",\n            \"Thumbnail\": {\n                \"Url\":    \"http://www.example.com/image/481989943\",\n                \"Height\": 125,\n                \"Width\":  100\n            },\n            \"Animated\" : false,\n            \"IDs\": [116, 943, 234, -38793],\n            \"DeletionDate\": null,\n            \"Distance\": 12.723374634\n        }\n    }]\n    )\";\n\n    // create a SAX event consumer object\n    sax_event_consumer sec;\n\n    // parse JSON\n    bool result = json::sax_parse(text, &sec);\n\n    // output the recorded events\n    for (auto& event : sec.events)\n    {\n        std::cout << event << \"\\n\";\n    }\n\n    // output the result of sax_parse\n    std::cout << \"\\nresult: \" << std::boolalpha << result << std::endl;\n}\n

    Output:

    start_object(elements=18446744073709551615)\nkey(val=Image)\nstart_object(elements=18446744073709551615)\nkey(val=Width)\nnumber_unsigned(val=800)\nkey(val=Height)\nnumber_unsigned(val=600)\nkey(val=Title)\nstring(val=View from 15th Floor)\nkey(val=Thumbnail)\nstart_object(elements=18446744073709551615)\nkey(val=Url)\nstring(val=http://www.example.com/image/481989943)\nkey(val=Height)\nnumber_unsigned(val=125)\nkey(val=Width)\nnumber_unsigned(val=100)\nend_object()\nkey(val=Animated)\nboolean(val=false)\nkey(val=IDs)\nstart_array(elements=18446744073709551615)\nnumber_unsigned(val=116)\nnumber_unsigned(val=943)\nnumber_unsigned(val=234)\nnumber_integer(val=-38793)\nend_array()\nkey(val=DeletionDate)\nnull()\nkey(val=Distance)\nnumber_float(val=12.723375, s=12.723374634)\nend_object()\nend_object()\nparse_error(position=460, last_token=12.723374634<U+000A>        }<U+000A>    }],\n            ex=[json.exception.parse_error.101] parse error at line 17, column 6: syntax error while parsing value - unexpected ']'; expected end of input)\n\nresult: false\n
    "},{"location":"api/json_sax/null/#version-history","title":"Version history","text":"
    • Added in version 3.2.0.
    "},{"location":"api/json_sax/number_float/","title":"nlohmann::json_sax::number_float","text":"
    virtual bool number_float(number_float_t val, const string_t& s) = 0;\n

    A floating-point number was read.

    "},{"location":"api/json_sax/number_float/#parameters","title":"Parameters","text":"val (in) floating-point value s (in) string representation of the original input"},{"location":"api/json_sax/number_float/#return-value","title":"Return value","text":"

    Whether parsing should proceed.

    "},{"location":"api/json_sax/number_float/#examples","title":"Examples","text":"Example

    The example below shows how the SAX interface is used.

    #include <iostream>\n#include <iomanip>\n#include <sstream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\n// a simple event consumer that collects string representations of the passed\n// values; note inheriting from json::json_sax_t is not required, but can\n// help not to forget a required function\nclass sax_event_consumer : public json::json_sax_t\n{\n  public:\n    std::vector<std::string> events;\n\n    bool null() override\n    {\n        events.push_back(\"null()\");\n        return true;\n    }\n\n    bool boolean(bool val) override\n    {\n        events.push_back(\"boolean(val=\" + std::string(val ? \"true\" : \"false\") + \")\");\n        return true;\n    }\n\n    bool number_integer(number_integer_t val) override\n    {\n        events.push_back(\"number_integer(val=\" + std::to_string(val) + \")\");\n        return true;\n    }\n\n    bool number_unsigned(number_unsigned_t val) override\n    {\n        events.push_back(\"number_unsigned(val=\" + std::to_string(val) + \")\");\n        return true;\n    }\n\n    bool number_float(number_float_t val, const string_t& s) override\n    {\n        events.push_back(\"number_float(val=\" + std::to_string(val) + \", s=\" + s + \")\");\n        return true;\n    }\n\n    bool string(string_t& val) override\n    {\n        events.push_back(\"string(val=\" + val + \")\");\n        return true;\n    }\n\n    bool start_object(std::size_t elements) override\n    {\n        events.push_back(\"start_object(elements=\" + std::to_string(elements) + \")\");\n        return true;\n    }\n\n    bool end_object() override\n    {\n        events.push_back(\"end_object()\");\n        return true;\n    }\n\n    bool start_array(std::size_t elements) override\n    {\n        events.push_back(\"start_array(elements=\" + std::to_string(elements) + \")\");\n        return true;\n    }\n\n    bool end_array() override\n    {\n        events.push_back(\"end_array()\");\n        return true;\n    }\n\n    bool key(string_t& val) override\n    {\n        events.push_back(\"key(val=\" + val + \")\");\n        return true;\n    }\n\n    bool binary(json::binary_t& val) override\n    {\n        events.push_back(\"binary(val=[...])\");\n        return true;\n    }\n\n    bool parse_error(std::size_t position, const std::string& last_token, const json::exception& ex) override\n    {\n        events.push_back(\"parse_error(position=\" + std::to_string(position) + \", last_token=\" + last_token + \",\\n            ex=\" + std::string(ex.what()) + \")\");\n        return false;\n    }\n};\n\nint main()\n{\n    // a JSON text\n    auto text = R\"(\n    {\n        \"Image\": {\n            \"Width\":  800,\n            \"Height\": 600,\n            \"Title\":  \"View from 15th Floor\",\n            \"Thumbnail\": {\n                \"Url\":    \"http://www.example.com/image/481989943\",\n                \"Height\": 125,\n                \"Width\":  100\n            },\n            \"Animated\" : false,\n            \"IDs\": [116, 943, 234, -38793],\n            \"DeletionDate\": null,\n            \"Distance\": 12.723374634\n        }\n    }]\n    )\";\n\n    // create a SAX event consumer object\n    sax_event_consumer sec;\n\n    // parse JSON\n    bool result = json::sax_parse(text, &sec);\n\n    // output the recorded events\n    for (auto& event : sec.events)\n    {\n        std::cout << event << \"\\n\";\n    }\n\n    // output the result of sax_parse\n    std::cout << \"\\nresult: \" << std::boolalpha << result << std::endl;\n}\n

    Output:

    start_object(elements=18446744073709551615)\nkey(val=Image)\nstart_object(elements=18446744073709551615)\nkey(val=Width)\nnumber_unsigned(val=800)\nkey(val=Height)\nnumber_unsigned(val=600)\nkey(val=Title)\nstring(val=View from 15th Floor)\nkey(val=Thumbnail)\nstart_object(elements=18446744073709551615)\nkey(val=Url)\nstring(val=http://www.example.com/image/481989943)\nkey(val=Height)\nnumber_unsigned(val=125)\nkey(val=Width)\nnumber_unsigned(val=100)\nend_object()\nkey(val=Animated)\nboolean(val=false)\nkey(val=IDs)\nstart_array(elements=18446744073709551615)\nnumber_unsigned(val=116)\nnumber_unsigned(val=943)\nnumber_unsigned(val=234)\nnumber_integer(val=-38793)\nend_array()\nkey(val=DeletionDate)\nnull()\nkey(val=Distance)\nnumber_float(val=12.723375, s=12.723374634)\nend_object()\nend_object()\nparse_error(position=460, last_token=12.723374634<U+000A>        }<U+000A>    }],\n            ex=[json.exception.parse_error.101] parse error at line 17, column 6: syntax error while parsing value - unexpected ']'; expected end of input)\n\nresult: false\n
    "},{"location":"api/json_sax/number_float/#version-history","title":"Version history","text":"
    • Added in version 3.2.0.
    "},{"location":"api/json_sax/number_integer/","title":"nlohmann::json_sax::number_integer","text":"
    virtual bool number_integer(number_integer_t val) = 0;\n

    An integer number was read.

    "},{"location":"api/json_sax/number_integer/#parameters","title":"Parameters","text":"val (in) integer value"},{"location":"api/json_sax/number_integer/#return-value","title":"Return value","text":"

    Whether parsing should proceed.

    "},{"location":"api/json_sax/number_integer/#examples","title":"Examples","text":"Example

    The example below shows how the SAX interface is used.

    #include <iostream>\n#include <iomanip>\n#include <sstream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\n// a simple event consumer that collects string representations of the passed\n// values; note inheriting from json::json_sax_t is not required, but can\n// help not to forget a required function\nclass sax_event_consumer : public json::json_sax_t\n{\n  public:\n    std::vector<std::string> events;\n\n    bool null() override\n    {\n        events.push_back(\"null()\");\n        return true;\n    }\n\n    bool boolean(bool val) override\n    {\n        events.push_back(\"boolean(val=\" + std::string(val ? \"true\" : \"false\") + \")\");\n        return true;\n    }\n\n    bool number_integer(number_integer_t val) override\n    {\n        events.push_back(\"number_integer(val=\" + std::to_string(val) + \")\");\n        return true;\n    }\n\n    bool number_unsigned(number_unsigned_t val) override\n    {\n        events.push_back(\"number_unsigned(val=\" + std::to_string(val) + \")\");\n        return true;\n    }\n\n    bool number_float(number_float_t val, const string_t& s) override\n    {\n        events.push_back(\"number_float(val=\" + std::to_string(val) + \", s=\" + s + \")\");\n        return true;\n    }\n\n    bool string(string_t& val) override\n    {\n        events.push_back(\"string(val=\" + val + \")\");\n        return true;\n    }\n\n    bool start_object(std::size_t elements) override\n    {\n        events.push_back(\"start_object(elements=\" + std::to_string(elements) + \")\");\n        return true;\n    }\n\n    bool end_object() override\n    {\n        events.push_back(\"end_object()\");\n        return true;\n    }\n\n    bool start_array(std::size_t elements) override\n    {\n        events.push_back(\"start_array(elements=\" + std::to_string(elements) + \")\");\n        return true;\n    }\n\n    bool end_array() override\n    {\n        events.push_back(\"end_array()\");\n        return true;\n    }\n\n    bool key(string_t& val) override\n    {\n        events.push_back(\"key(val=\" + val + \")\");\n        return true;\n    }\n\n    bool binary(json::binary_t& val) override\n    {\n        events.push_back(\"binary(val=[...])\");\n        return true;\n    }\n\n    bool parse_error(std::size_t position, const std::string& last_token, const json::exception& ex) override\n    {\n        events.push_back(\"parse_error(position=\" + std::to_string(position) + \", last_token=\" + last_token + \",\\n            ex=\" + std::string(ex.what()) + \")\");\n        return false;\n    }\n};\n\nint main()\n{\n    // a JSON text\n    auto text = R\"(\n    {\n        \"Image\": {\n            \"Width\":  800,\n            \"Height\": 600,\n            \"Title\":  \"View from 15th Floor\",\n            \"Thumbnail\": {\n                \"Url\":    \"http://www.example.com/image/481989943\",\n                \"Height\": 125,\n                \"Width\":  100\n            },\n            \"Animated\" : false,\n            \"IDs\": [116, 943, 234, -38793],\n            \"DeletionDate\": null,\n            \"Distance\": 12.723374634\n        }\n    }]\n    )\";\n\n    // create a SAX event consumer object\n    sax_event_consumer sec;\n\n    // parse JSON\n    bool result = json::sax_parse(text, &sec);\n\n    // output the recorded events\n    for (auto& event : sec.events)\n    {\n        std::cout << event << \"\\n\";\n    }\n\n    // output the result of sax_parse\n    std::cout << \"\\nresult: \" << std::boolalpha << result << std::endl;\n}\n

    Output:

    start_object(elements=18446744073709551615)\nkey(val=Image)\nstart_object(elements=18446744073709551615)\nkey(val=Width)\nnumber_unsigned(val=800)\nkey(val=Height)\nnumber_unsigned(val=600)\nkey(val=Title)\nstring(val=View from 15th Floor)\nkey(val=Thumbnail)\nstart_object(elements=18446744073709551615)\nkey(val=Url)\nstring(val=http://www.example.com/image/481989943)\nkey(val=Height)\nnumber_unsigned(val=125)\nkey(val=Width)\nnumber_unsigned(val=100)\nend_object()\nkey(val=Animated)\nboolean(val=false)\nkey(val=IDs)\nstart_array(elements=18446744073709551615)\nnumber_unsigned(val=116)\nnumber_unsigned(val=943)\nnumber_unsigned(val=234)\nnumber_integer(val=-38793)\nend_array()\nkey(val=DeletionDate)\nnull()\nkey(val=Distance)\nnumber_float(val=12.723375, s=12.723374634)\nend_object()\nend_object()\nparse_error(position=460, last_token=12.723374634<U+000A>        }<U+000A>    }],\n            ex=[json.exception.parse_error.101] parse error at line 17, column 6: syntax error while parsing value - unexpected ']'; expected end of input)\n\nresult: false\n
    "},{"location":"api/json_sax/number_integer/#version-history","title":"Version history","text":"
    • Added in version 3.2.0.
    "},{"location":"api/json_sax/number_unsigned/","title":"nlohmann::json_sax::number_unsigned","text":"
    virtual bool number_unsigned(number_unsigned_t val) = 0;\n

    An unsigned integer number was read.

    "},{"location":"api/json_sax/number_unsigned/#parameters","title":"Parameters","text":"val (in) unsigned integer value"},{"location":"api/json_sax/number_unsigned/#return-value","title":"Return value","text":"

    Whether parsing should proceed.

    "},{"location":"api/json_sax/number_unsigned/#examples","title":"Examples","text":"Example

    The example below shows how the SAX interface is used.

    #include <iostream>\n#include <iomanip>\n#include <sstream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\n// a simple event consumer that collects string representations of the passed\n// values; note inheriting from json::json_sax_t is not required, but can\n// help not to forget a required function\nclass sax_event_consumer : public json::json_sax_t\n{\n  public:\n    std::vector<std::string> events;\n\n    bool null() override\n    {\n        events.push_back(\"null()\");\n        return true;\n    }\n\n    bool boolean(bool val) override\n    {\n        events.push_back(\"boolean(val=\" + std::string(val ? \"true\" : \"false\") + \")\");\n        return true;\n    }\n\n    bool number_integer(number_integer_t val) override\n    {\n        events.push_back(\"number_integer(val=\" + std::to_string(val) + \")\");\n        return true;\n    }\n\n    bool number_unsigned(number_unsigned_t val) override\n    {\n        events.push_back(\"number_unsigned(val=\" + std::to_string(val) + \")\");\n        return true;\n    }\n\n    bool number_float(number_float_t val, const string_t& s) override\n    {\n        events.push_back(\"number_float(val=\" + std::to_string(val) + \", s=\" + s + \")\");\n        return true;\n    }\n\n    bool string(string_t& val) override\n    {\n        events.push_back(\"string(val=\" + val + \")\");\n        return true;\n    }\n\n    bool start_object(std::size_t elements) override\n    {\n        events.push_back(\"start_object(elements=\" + std::to_string(elements) + \")\");\n        return true;\n    }\n\n    bool end_object() override\n    {\n        events.push_back(\"end_object()\");\n        return true;\n    }\n\n    bool start_array(std::size_t elements) override\n    {\n        events.push_back(\"start_array(elements=\" + std::to_string(elements) + \")\");\n        return true;\n    }\n\n    bool end_array() override\n    {\n        events.push_back(\"end_array()\");\n        return true;\n    }\n\n    bool key(string_t& val) override\n    {\n        events.push_back(\"key(val=\" + val + \")\");\n        return true;\n    }\n\n    bool binary(json::binary_t& val) override\n    {\n        events.push_back(\"binary(val=[...])\");\n        return true;\n    }\n\n    bool parse_error(std::size_t position, const std::string& last_token, const json::exception& ex) override\n    {\n        events.push_back(\"parse_error(position=\" + std::to_string(position) + \", last_token=\" + last_token + \",\\n            ex=\" + std::string(ex.what()) + \")\");\n        return false;\n    }\n};\n\nint main()\n{\n    // a JSON text\n    auto text = R\"(\n    {\n        \"Image\": {\n            \"Width\":  800,\n            \"Height\": 600,\n            \"Title\":  \"View from 15th Floor\",\n            \"Thumbnail\": {\n                \"Url\":    \"http://www.example.com/image/481989943\",\n                \"Height\": 125,\n                \"Width\":  100\n            },\n            \"Animated\" : false,\n            \"IDs\": [116, 943, 234, -38793],\n            \"DeletionDate\": null,\n            \"Distance\": 12.723374634\n        }\n    }]\n    )\";\n\n    // create a SAX event consumer object\n    sax_event_consumer sec;\n\n    // parse JSON\n    bool result = json::sax_parse(text, &sec);\n\n    // output the recorded events\n    for (auto& event : sec.events)\n    {\n        std::cout << event << \"\\n\";\n    }\n\n    // output the result of sax_parse\n    std::cout << \"\\nresult: \" << std::boolalpha << result << std::endl;\n}\n

    Output:

    start_object(elements=18446744073709551615)\nkey(val=Image)\nstart_object(elements=18446744073709551615)\nkey(val=Width)\nnumber_unsigned(val=800)\nkey(val=Height)\nnumber_unsigned(val=600)\nkey(val=Title)\nstring(val=View from 15th Floor)\nkey(val=Thumbnail)\nstart_object(elements=18446744073709551615)\nkey(val=Url)\nstring(val=http://www.example.com/image/481989943)\nkey(val=Height)\nnumber_unsigned(val=125)\nkey(val=Width)\nnumber_unsigned(val=100)\nend_object()\nkey(val=Animated)\nboolean(val=false)\nkey(val=IDs)\nstart_array(elements=18446744073709551615)\nnumber_unsigned(val=116)\nnumber_unsigned(val=943)\nnumber_unsigned(val=234)\nnumber_integer(val=-38793)\nend_array()\nkey(val=DeletionDate)\nnull()\nkey(val=Distance)\nnumber_float(val=12.723375, s=12.723374634)\nend_object()\nend_object()\nparse_error(position=460, last_token=12.723374634<U+000A>        }<U+000A>    }],\n            ex=[json.exception.parse_error.101] parse error at line 17, column 6: syntax error while parsing value - unexpected ']'; expected end of input)\n\nresult: false\n
    "},{"location":"api/json_sax/number_unsigned/#version-history","title":"Version history","text":"
    • Added in version 3.2.0.
    "},{"location":"api/json_sax/parse_error/","title":"nlohmann::json_sax::parse_error","text":"
    virtual bool parse_error(std::size_t position,\n                         const std::string& last_token,\n                         const detail::exception& ex) = 0;\n

    A parse error occurred.

    "},{"location":"api/json_sax/parse_error/#parameters","title":"Parameters","text":"position (in) the position in the input where the error occurs last_token (in) the last read token ex (in) an exception object describing the error"},{"location":"api/json_sax/parse_error/#return-value","title":"Return value","text":"

    Whether parsing should proceed (must return false).

    "},{"location":"api/json_sax/parse_error/#examples","title":"Examples","text":"Example

    The example below shows how the SAX interface is used.

    #include <iostream>\n#include <iomanip>\n#include <sstream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\n// a simple event consumer that collects string representations of the passed\n// values; note inheriting from json::json_sax_t is not required, but can\n// help not to forget a required function\nclass sax_event_consumer : public json::json_sax_t\n{\n  public:\n    std::vector<std::string> events;\n\n    bool null() override\n    {\n        events.push_back(\"null()\");\n        return true;\n    }\n\n    bool boolean(bool val) override\n    {\n        events.push_back(\"boolean(val=\" + std::string(val ? \"true\" : \"false\") + \")\");\n        return true;\n    }\n\n    bool number_integer(number_integer_t val) override\n    {\n        events.push_back(\"number_integer(val=\" + std::to_string(val) + \")\");\n        return true;\n    }\n\n    bool number_unsigned(number_unsigned_t val) override\n    {\n        events.push_back(\"number_unsigned(val=\" + std::to_string(val) + \")\");\n        return true;\n    }\n\n    bool number_float(number_float_t val, const string_t& s) override\n    {\n        events.push_back(\"number_float(val=\" + std::to_string(val) + \", s=\" + s + \")\");\n        return true;\n    }\n\n    bool string(string_t& val) override\n    {\n        events.push_back(\"string(val=\" + val + \")\");\n        return true;\n    }\n\n    bool start_object(std::size_t elements) override\n    {\n        events.push_back(\"start_object(elements=\" + std::to_string(elements) + \")\");\n        return true;\n    }\n\n    bool end_object() override\n    {\n        events.push_back(\"end_object()\");\n        return true;\n    }\n\n    bool start_array(std::size_t elements) override\n    {\n        events.push_back(\"start_array(elements=\" + std::to_string(elements) + \")\");\n        return true;\n    }\n\n    bool end_array() override\n    {\n        events.push_back(\"end_array()\");\n        return true;\n    }\n\n    bool key(string_t& val) override\n    {\n        events.push_back(\"key(val=\" + val + \")\");\n        return true;\n    }\n\n    bool binary(json::binary_t& val) override\n    {\n        events.push_back(\"binary(val=[...])\");\n        return true;\n    }\n\n    bool parse_error(std::size_t position, const std::string& last_token, const json::exception& ex) override\n    {\n        events.push_back(\"parse_error(position=\" + std::to_string(position) + \", last_token=\" + last_token + \",\\n            ex=\" + std::string(ex.what()) + \")\");\n        return false;\n    }\n};\n\nint main()\n{\n    // a JSON text\n    auto text = R\"(\n    {\n        \"Image\": {\n            \"Width\":  800,\n            \"Height\": 600,\n            \"Title\":  \"View from 15th Floor\",\n            \"Thumbnail\": {\n                \"Url\":    \"http://www.example.com/image/481989943\",\n                \"Height\": 125,\n                \"Width\":  100\n            },\n            \"Animated\" : false,\n            \"IDs\": [116, 943, 234, -38793],\n            \"DeletionDate\": null,\n            \"Distance\": 12.723374634\n        }\n    }]\n    )\";\n\n    // create a SAX event consumer object\n    sax_event_consumer sec;\n\n    // parse JSON\n    bool result = json::sax_parse(text, &sec);\n\n    // output the recorded events\n    for (auto& event : sec.events)\n    {\n        std::cout << event << \"\\n\";\n    }\n\n    // output the result of sax_parse\n    std::cout << \"\\nresult: \" << std::boolalpha << result << std::endl;\n}\n

    Output:

    start_object(elements=18446744073709551615)\nkey(val=Image)\nstart_object(elements=18446744073709551615)\nkey(val=Width)\nnumber_unsigned(val=800)\nkey(val=Height)\nnumber_unsigned(val=600)\nkey(val=Title)\nstring(val=View from 15th Floor)\nkey(val=Thumbnail)\nstart_object(elements=18446744073709551615)\nkey(val=Url)\nstring(val=http://www.example.com/image/481989943)\nkey(val=Height)\nnumber_unsigned(val=125)\nkey(val=Width)\nnumber_unsigned(val=100)\nend_object()\nkey(val=Animated)\nboolean(val=false)\nkey(val=IDs)\nstart_array(elements=18446744073709551615)\nnumber_unsigned(val=116)\nnumber_unsigned(val=943)\nnumber_unsigned(val=234)\nnumber_integer(val=-38793)\nend_array()\nkey(val=DeletionDate)\nnull()\nkey(val=Distance)\nnumber_float(val=12.723375, s=12.723374634)\nend_object()\nend_object()\nparse_error(position=460, last_token=12.723374634<U+000A>        }<U+000A>    }],\n            ex=[json.exception.parse_error.101] parse error at line 17, column 6: syntax error while parsing value - unexpected ']'; expected end of input)\n\nresult: false\n
    "},{"location":"api/json_sax/parse_error/#version-history","title":"Version history","text":"
    • Added in version 3.2.0.
    "},{"location":"api/json_sax/start_array/","title":"nlohmann::json_sax::start_array","text":"
    virtual bool start_array(std::size_t elements) = 0;\n

    The beginning of an array was read.

    "},{"location":"api/json_sax/start_array/#parameters","title":"Parameters","text":"elements (in) number of object elements or -1 if unknown"},{"location":"api/json_sax/start_array/#return-value","title":"Return value","text":"

    Whether parsing should proceed.

    "},{"location":"api/json_sax/start_array/#notes","title":"Notes","text":"

    Binary formats may report the number of elements.

    "},{"location":"api/json_sax/start_array/#examples","title":"Examples","text":"Example

    The example below shows how the SAX interface is used.

    #include <iostream>\n#include <iomanip>\n#include <sstream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\n// a simple event consumer that collects string representations of the passed\n// values; note inheriting from json::json_sax_t is not required, but can\n// help not to forget a required function\nclass sax_event_consumer : public json::json_sax_t\n{\n  public:\n    std::vector<std::string> events;\n\n    bool null() override\n    {\n        events.push_back(\"null()\");\n        return true;\n    }\n\n    bool boolean(bool val) override\n    {\n        events.push_back(\"boolean(val=\" + std::string(val ? \"true\" : \"false\") + \")\");\n        return true;\n    }\n\n    bool number_integer(number_integer_t val) override\n    {\n        events.push_back(\"number_integer(val=\" + std::to_string(val) + \")\");\n        return true;\n    }\n\n    bool number_unsigned(number_unsigned_t val) override\n    {\n        events.push_back(\"number_unsigned(val=\" + std::to_string(val) + \")\");\n        return true;\n    }\n\n    bool number_float(number_float_t val, const string_t& s) override\n    {\n        events.push_back(\"number_float(val=\" + std::to_string(val) + \", s=\" + s + \")\");\n        return true;\n    }\n\n    bool string(string_t& val) override\n    {\n        events.push_back(\"string(val=\" + val + \")\");\n        return true;\n    }\n\n    bool start_object(std::size_t elements) override\n    {\n        events.push_back(\"start_object(elements=\" + std::to_string(elements) + \")\");\n        return true;\n    }\n\n    bool end_object() override\n    {\n        events.push_back(\"end_object()\");\n        return true;\n    }\n\n    bool start_array(std::size_t elements) override\n    {\n        events.push_back(\"start_array(elements=\" + std::to_string(elements) + \")\");\n        return true;\n    }\n\n    bool end_array() override\n    {\n        events.push_back(\"end_array()\");\n        return true;\n    }\n\n    bool key(string_t& val) override\n    {\n        events.push_back(\"key(val=\" + val + \")\");\n        return true;\n    }\n\n    bool binary(json::binary_t& val) override\n    {\n        events.push_back(\"binary(val=[...])\");\n        return true;\n    }\n\n    bool parse_error(std::size_t position, const std::string& last_token, const json::exception& ex) override\n    {\n        events.push_back(\"parse_error(position=\" + std::to_string(position) + \", last_token=\" + last_token + \",\\n            ex=\" + std::string(ex.what()) + \")\");\n        return false;\n    }\n};\n\nint main()\n{\n    // a JSON text\n    auto text = R\"(\n    {\n        \"Image\": {\n            \"Width\":  800,\n            \"Height\": 600,\n            \"Title\":  \"View from 15th Floor\",\n            \"Thumbnail\": {\n                \"Url\":    \"http://www.example.com/image/481989943\",\n                \"Height\": 125,\n                \"Width\":  100\n            },\n            \"Animated\" : false,\n            \"IDs\": [116, 943, 234, -38793],\n            \"DeletionDate\": null,\n            \"Distance\": 12.723374634\n        }\n    }]\n    )\";\n\n    // create a SAX event consumer object\n    sax_event_consumer sec;\n\n    // parse JSON\n    bool result = json::sax_parse(text, &sec);\n\n    // output the recorded events\n    for (auto& event : sec.events)\n    {\n        std::cout << event << \"\\n\";\n    }\n\n    // output the result of sax_parse\n    std::cout << \"\\nresult: \" << std::boolalpha << result << std::endl;\n}\n

    Output:

    start_object(elements=18446744073709551615)\nkey(val=Image)\nstart_object(elements=18446744073709551615)\nkey(val=Width)\nnumber_unsigned(val=800)\nkey(val=Height)\nnumber_unsigned(val=600)\nkey(val=Title)\nstring(val=View from 15th Floor)\nkey(val=Thumbnail)\nstart_object(elements=18446744073709551615)\nkey(val=Url)\nstring(val=http://www.example.com/image/481989943)\nkey(val=Height)\nnumber_unsigned(val=125)\nkey(val=Width)\nnumber_unsigned(val=100)\nend_object()\nkey(val=Animated)\nboolean(val=false)\nkey(val=IDs)\nstart_array(elements=18446744073709551615)\nnumber_unsigned(val=116)\nnumber_unsigned(val=943)\nnumber_unsigned(val=234)\nnumber_integer(val=-38793)\nend_array()\nkey(val=DeletionDate)\nnull()\nkey(val=Distance)\nnumber_float(val=12.723375, s=12.723374634)\nend_object()\nend_object()\nparse_error(position=460, last_token=12.723374634<U+000A>        }<U+000A>    }],\n            ex=[json.exception.parse_error.101] parse error at line 17, column 6: syntax error while parsing value - unexpected ']'; expected end of input)\n\nresult: false\n
    "},{"location":"api/json_sax/start_array/#version-history","title":"Version history","text":"
    • Added in version 3.2.0.
    "},{"location":"api/json_sax/start_object/","title":"nlohmann::json_sax::start_object","text":"
    virtual bool start_object(std::size_t elements) = 0;\n

    The beginning of an object was read.

    "},{"location":"api/json_sax/start_object/#parameters","title":"Parameters","text":"elements (in) number of object elements or -1 if unknown"},{"location":"api/json_sax/start_object/#return-value","title":"Return value","text":"

    Whether parsing should proceed.

    "},{"location":"api/json_sax/start_object/#notes","title":"Notes","text":"

    Binary formats may report the number of elements.

    "},{"location":"api/json_sax/start_object/#examples","title":"Examples","text":"Example

    The example below shows how the SAX interface is used.

    #include <iostream>\n#include <iomanip>\n#include <sstream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\n// a simple event consumer that collects string representations of the passed\n// values; note inheriting from json::json_sax_t is not required, but can\n// help not to forget a required function\nclass sax_event_consumer : public json::json_sax_t\n{\n  public:\n    std::vector<std::string> events;\n\n    bool null() override\n    {\n        events.push_back(\"null()\");\n        return true;\n    }\n\n    bool boolean(bool val) override\n    {\n        events.push_back(\"boolean(val=\" + std::string(val ? \"true\" : \"false\") + \")\");\n        return true;\n    }\n\n    bool number_integer(number_integer_t val) override\n    {\n        events.push_back(\"number_integer(val=\" + std::to_string(val) + \")\");\n        return true;\n    }\n\n    bool number_unsigned(number_unsigned_t val) override\n    {\n        events.push_back(\"number_unsigned(val=\" + std::to_string(val) + \")\");\n        return true;\n    }\n\n    bool number_float(number_float_t val, const string_t& s) override\n    {\n        events.push_back(\"number_float(val=\" + std::to_string(val) + \", s=\" + s + \")\");\n        return true;\n    }\n\n    bool string(string_t& val) override\n    {\n        events.push_back(\"string(val=\" + val + \")\");\n        return true;\n    }\n\n    bool start_object(std::size_t elements) override\n    {\n        events.push_back(\"start_object(elements=\" + std::to_string(elements) + \")\");\n        return true;\n    }\n\n    bool end_object() override\n    {\n        events.push_back(\"end_object()\");\n        return true;\n    }\n\n    bool start_array(std::size_t elements) override\n    {\n        events.push_back(\"start_array(elements=\" + std::to_string(elements) + \")\");\n        return true;\n    }\n\n    bool end_array() override\n    {\n        events.push_back(\"end_array()\");\n        return true;\n    }\n\n    bool key(string_t& val) override\n    {\n        events.push_back(\"key(val=\" + val + \")\");\n        return true;\n    }\n\n    bool binary(json::binary_t& val) override\n    {\n        events.push_back(\"binary(val=[...])\");\n        return true;\n    }\n\n    bool parse_error(std::size_t position, const std::string& last_token, const json::exception& ex) override\n    {\n        events.push_back(\"parse_error(position=\" + std::to_string(position) + \", last_token=\" + last_token + \",\\n            ex=\" + std::string(ex.what()) + \")\");\n        return false;\n    }\n};\n\nint main()\n{\n    // a JSON text\n    auto text = R\"(\n    {\n        \"Image\": {\n            \"Width\":  800,\n            \"Height\": 600,\n            \"Title\":  \"View from 15th Floor\",\n            \"Thumbnail\": {\n                \"Url\":    \"http://www.example.com/image/481989943\",\n                \"Height\": 125,\n                \"Width\":  100\n            },\n            \"Animated\" : false,\n            \"IDs\": [116, 943, 234, -38793],\n            \"DeletionDate\": null,\n            \"Distance\": 12.723374634\n        }\n    }]\n    )\";\n\n    // create a SAX event consumer object\n    sax_event_consumer sec;\n\n    // parse JSON\n    bool result = json::sax_parse(text, &sec);\n\n    // output the recorded events\n    for (auto& event : sec.events)\n    {\n        std::cout << event << \"\\n\";\n    }\n\n    // output the result of sax_parse\n    std::cout << \"\\nresult: \" << std::boolalpha << result << std::endl;\n}\n

    Output:

    start_object(elements=18446744073709551615)\nkey(val=Image)\nstart_object(elements=18446744073709551615)\nkey(val=Width)\nnumber_unsigned(val=800)\nkey(val=Height)\nnumber_unsigned(val=600)\nkey(val=Title)\nstring(val=View from 15th Floor)\nkey(val=Thumbnail)\nstart_object(elements=18446744073709551615)\nkey(val=Url)\nstring(val=http://www.example.com/image/481989943)\nkey(val=Height)\nnumber_unsigned(val=125)\nkey(val=Width)\nnumber_unsigned(val=100)\nend_object()\nkey(val=Animated)\nboolean(val=false)\nkey(val=IDs)\nstart_array(elements=18446744073709551615)\nnumber_unsigned(val=116)\nnumber_unsigned(val=943)\nnumber_unsigned(val=234)\nnumber_integer(val=-38793)\nend_array()\nkey(val=DeletionDate)\nnull()\nkey(val=Distance)\nnumber_float(val=12.723375, s=12.723374634)\nend_object()\nend_object()\nparse_error(position=460, last_token=12.723374634<U+000A>        }<U+000A>    }],\n            ex=[json.exception.parse_error.101] parse error at line 17, column 6: syntax error while parsing value - unexpected ']'; expected end of input)\n\nresult: false\n
    "},{"location":"api/json_sax/start_object/#version-history","title":"Version history","text":"
    • Added in version 3.2.0.
    "},{"location":"api/json_sax/string/","title":"nlohmann::json_sax::string","text":"
    virtual bool string(string_t& val) = 0;\n

    A string value was read.

    "},{"location":"api/json_sax/string/#parameters","title":"Parameters","text":"val (in) string value"},{"location":"api/json_sax/string/#return-value","title":"Return value","text":"

    Whether parsing should proceed.

    "},{"location":"api/json_sax/string/#notes","title":"Notes","text":"

    It is safe to move the passed string value.

    "},{"location":"api/json_sax/string/#examples","title":"Examples","text":"Example

    The example below shows how the SAX interface is used.

    #include <iostream>\n#include <iomanip>\n#include <sstream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\n// a simple event consumer that collects string representations of the passed\n// values; note inheriting from json::json_sax_t is not required, but can\n// help not to forget a required function\nclass sax_event_consumer : public json::json_sax_t\n{\n  public:\n    std::vector<std::string> events;\n\n    bool null() override\n    {\n        events.push_back(\"null()\");\n        return true;\n    }\n\n    bool boolean(bool val) override\n    {\n        events.push_back(\"boolean(val=\" + std::string(val ? \"true\" : \"false\") + \")\");\n        return true;\n    }\n\n    bool number_integer(number_integer_t val) override\n    {\n        events.push_back(\"number_integer(val=\" + std::to_string(val) + \")\");\n        return true;\n    }\n\n    bool number_unsigned(number_unsigned_t val) override\n    {\n        events.push_back(\"number_unsigned(val=\" + std::to_string(val) + \")\");\n        return true;\n    }\n\n    bool number_float(number_float_t val, const string_t& s) override\n    {\n        events.push_back(\"number_float(val=\" + std::to_string(val) + \", s=\" + s + \")\");\n        return true;\n    }\n\n    bool string(string_t& val) override\n    {\n        events.push_back(\"string(val=\" + val + \")\");\n        return true;\n    }\n\n    bool start_object(std::size_t elements) override\n    {\n        events.push_back(\"start_object(elements=\" + std::to_string(elements) + \")\");\n        return true;\n    }\n\n    bool end_object() override\n    {\n        events.push_back(\"end_object()\");\n        return true;\n    }\n\n    bool start_array(std::size_t elements) override\n    {\n        events.push_back(\"start_array(elements=\" + std::to_string(elements) + \")\");\n        return true;\n    }\n\n    bool end_array() override\n    {\n        events.push_back(\"end_array()\");\n        return true;\n    }\n\n    bool key(string_t& val) override\n    {\n        events.push_back(\"key(val=\" + val + \")\");\n        return true;\n    }\n\n    bool binary(json::binary_t& val) override\n    {\n        events.push_back(\"binary(val=[...])\");\n        return true;\n    }\n\n    bool parse_error(std::size_t position, const std::string& last_token, const json::exception& ex) override\n    {\n        events.push_back(\"parse_error(position=\" + std::to_string(position) + \", last_token=\" + last_token + \",\\n            ex=\" + std::string(ex.what()) + \")\");\n        return false;\n    }\n};\n\nint main()\n{\n    // a JSON text\n    auto text = R\"(\n    {\n        \"Image\": {\n            \"Width\":  800,\n            \"Height\": 600,\n            \"Title\":  \"View from 15th Floor\",\n            \"Thumbnail\": {\n                \"Url\":    \"http://www.example.com/image/481989943\",\n                \"Height\": 125,\n                \"Width\":  100\n            },\n            \"Animated\" : false,\n            \"IDs\": [116, 943, 234, -38793],\n            \"DeletionDate\": null,\n            \"Distance\": 12.723374634\n        }\n    }]\n    )\";\n\n    // create a SAX event consumer object\n    sax_event_consumer sec;\n\n    // parse JSON\n    bool result = json::sax_parse(text, &sec);\n\n    // output the recorded events\n    for (auto& event : sec.events)\n    {\n        std::cout << event << \"\\n\";\n    }\n\n    // output the result of sax_parse\n    std::cout << \"\\nresult: \" << std::boolalpha << result << std::endl;\n}\n

    Output:

    start_object(elements=18446744073709551615)\nkey(val=Image)\nstart_object(elements=18446744073709551615)\nkey(val=Width)\nnumber_unsigned(val=800)\nkey(val=Height)\nnumber_unsigned(val=600)\nkey(val=Title)\nstring(val=View from 15th Floor)\nkey(val=Thumbnail)\nstart_object(elements=18446744073709551615)\nkey(val=Url)\nstring(val=http://www.example.com/image/481989943)\nkey(val=Height)\nnumber_unsigned(val=125)\nkey(val=Width)\nnumber_unsigned(val=100)\nend_object()\nkey(val=Animated)\nboolean(val=false)\nkey(val=IDs)\nstart_array(elements=18446744073709551615)\nnumber_unsigned(val=116)\nnumber_unsigned(val=943)\nnumber_unsigned(val=234)\nnumber_integer(val=-38793)\nend_array()\nkey(val=DeletionDate)\nnull()\nkey(val=Distance)\nnumber_float(val=12.723375, s=12.723374634)\nend_object()\nend_object()\nparse_error(position=460, last_token=12.723374634<U+000A>        }<U+000A>    }],\n            ex=[json.exception.parse_error.101] parse error at line 17, column 6: syntax error while parsing value - unexpected ']'; expected end of input)\n\nresult: false\n
    "},{"location":"api/json_sax/string/#version-history","title":"Version history","text":"
    • Added in version 3.2.0.
    "},{"location":"api/macros/","title":"Macros","text":"

    Some aspects of the library can be configured by defining preprocessor macros before including the json.hpp header. See also the macro overview page.

    "},{"location":"api/macros/#runtime-assertions","title":"Runtime assertions","text":"
    • JSON_ASSERT(x) - control behavior of runtime assertions
    "},{"location":"api/macros/#exceptions","title":"Exceptions","text":"
    • JSON_CATCH_USER(exception)JSON_THROW_USER(exception)JSON_TRY_USER - control exceptions
    • JSON_DIAGNOSTICS - control extended diagnostics
    • JSON_DIAGNOSTIC_POSITIONS - access positions of elements
    • JSON_NOEXCEPTION - switch off exceptions
    "},{"location":"api/macros/#language-support","title":"Language support","text":"
    • JSON_HAS_CPP_11JSON_HAS_CPP_14JSON_HAS_CPP_17JSON_HAS_CPP_20 - set supported C++ standard
    • JSON_HAS_FILESYSTEMJSON_HAS_EXPERIMENTAL_FILESYSTEM - control std::filesystem support
    • JSON_HAS_RANGES - control std::ranges support
    • JSON_HAS_THREE_WAY_COMPARISON - control 3-way comparison support
    • JSON_NO_IO - switch off functions relying on certain C++ I/O headers
    • JSON_SKIP_UNSUPPORTED_COMPILER_CHECK - do not warn about unsupported compilers
    • JSON_USE_GLOBAL_UDLS - place user-defined string literals (UDLs) into the global namespace
    "},{"location":"api/macros/#library-version","title":"Library version","text":"
    • JSON_SKIP_LIBRARY_VERSION_CHECK - skip library version check
    • NLOHMANN_JSON_VERSION_MAJORNLOHMANN_JSON_VERSION_MINORNLOHMANN_JSON_VERSION_PATCH - library version information
    "},{"location":"api/macros/#library-namespace","title":"Library namespace","text":"
    • NLOHMANN_JSON_NAMESPACE - full name of the nlohmann namespace
    • NLOHMANN_JSON_NAMESPACE_BEGINNLOHMANN_JSON_NAMESPACE_END - open and close the library namespace
    • NLOHMANN_JSON_NAMESPACE_NO_VERSION - disable the version component of the inline namespace
    "},{"location":"api/macros/#type-conversions","title":"Type conversions","text":"
    • JSON_DISABLE_ENUM_SERIALIZATION - switch off default serialization/deserialization functions for enums
    • JSON_USE_IMPLICIT_CONVERSIONS - control implicit conversions
    "},{"location":"api/macros/#comparison-behavior","title":"Comparison behavior","text":"
    • JSON_USE_LEGACY_DISCARDED_VALUE_COMPARISON - control comparison of discarded values
    "},{"location":"api/macros/#serializationdeserialization-macros","title":"Serialization/deserialization macros","text":""},{"location":"api/macros/#enums","title":"Enums","text":"
    • NLOHMANN_JSON_SERIALIZE_ENUM - serialize/deserialize an enum
    "},{"location":"api/macros/#classes-and-structs","title":"Classes and structs","text":"
    • NLOHMANN_DEFINE_TYPE_INTRUSIVE - serialize/deserialize a non-derived class with private members
    • NLOHMANN_DEFINE_TYPE_INTRUSIVE_WITH_DEFAULT - serialize/deserialize a non-derived class with private members; uses default values
    • NLOHMANN_DEFINE_TYPE_INTRUSIVE_ONLY_SERIALIZE - serialize a non-derived class with private members
    • NLOHMANN_DEFINE_TYPE_NON_INTRUSIVE - serialize/deserialize a non-derived class
    • NLOHMANN_DEFINE_TYPE_NON_INTRUSIVE_WITH_DEFAULT - serialize/deserialize a non-derived class; uses default values

    • NLOHMANN_DEFINE_TYPE_NON_INTRUSIVE_ONLY_SERIALIZE - serialize a non-derived class

    • NLOHMANN_DEFINE_DERIVED_TYPE_INTRUSIVE - serialize/deserialize a derived class with private members

    • NLOHMANN_DEFINE_DERIVED_TYPE_INTRUSIVE_WITH_DEFAULT - serialize/deserialize a derived class with private members; uses default values
    • NLOHMANN_DEFINE_DERIVED_TYPE_INTRUSIVE_ONLY_SERIALIZE - serialize a derived class with private members
    • NLOHMANN_DEFINE_DERIVED_TYPE_NON_INTRUSIVE - serialize/deserialize a derived class
    • NLOHMANN_DEFINE_DERIVED_TYPE_NON_INTRUSIVE_WITH_DEFAULT - serialize/deserialize a derived class; uses default values
    • NLOHMANN_DEFINE_DERIVED_TYPE_NON_INTRUSIVE_ONLY_SERIALIZE - serialize a derived class
    "},{"location":"api/macros/json_assert/","title":"JSON_ASSERT","text":"
    #define JSON_ASSERT(x) /* value */\n

    This macro controls which code is executed for runtime assertions of the library.

    "},{"location":"api/macros/json_assert/#parameters","title":"Parameters","text":"x (in) expression of a scalar type"},{"location":"api/macros/json_assert/#default-definition","title":"Default definition","text":"

    The default value is assert(x).

    #define JSON_ASSERT(x) assert(x)\n

    Therefore, assertions can be switched off by defining NDEBUG.

    "},{"location":"api/macros/json_assert/#notes","title":"Notes","text":"
    • The library uses numerous assertions to guarantee invariants and to abort in case of otherwise undefined behavior (e.g., when calling operator[] with a missing object key on a const object). See page runtime assertions for more information.
    • Defining the macro to code that does not call std::abort may leave the library in an undefined state.
    • The macro is undefined outside the library.
    "},{"location":"api/macros/json_assert/#examples","title":"Examples","text":"Example 1: default behavior

    The following code will trigger an assertion at runtime:

    #include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    const json j = {{\"key\", \"value\"}};\n    auto v = j[\"missing\"];\n}\n

    Output:

    Assertion failed: (m_value.object->find(key) != m_value.object->end()), function operator[], file json.hpp, line 2144.\n
    Example 2: user-defined behavior

    The assertion reporting can be changed by defining JSON_ASSERT(x) differently.

    #include <cstdio>\n#include <cstdlib>\n#define JSON_ASSERT(x) if(!(x)){fprintf(stderr, \"assertion error in %s\\n\", __FUNCTION__); std::abort();}\n\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    const json j = {{\"key\", \"value\"}};\n    auto v = j[\"missing\"];\n}\n

    Output:

    assertion error in operator[]\n
    "},{"location":"api/macros/json_assert/#see-also","title":"See also","text":"
    • Runtime Assertions - overview documentation
    "},{"location":"api/macros/json_assert/#version-history","title":"Version history","text":"
    • Added in version 3.9.0.
    "},{"location":"api/macros/json_diagnostic_positions/","title":"JSON_DIAGNOSTIC_POSITIONS","text":"
    #define JSON_DIAGNOSTIC_POSITIONS /* value */\n

    This macro enables position diagnostics for generated JSON objects.

    When enabled, two new member functions start_pos() and end_pos() are added to basic_json values. If the value was created by calling theparse function, then these functions allow querying the byte positions of the value in the input it was parsed from. In case the value was constructed by other means, std::string::npos is returned.

    start_pos() returns the position of the first character of a given value in the original JSON string, while end_pos() returns the position of the character following the last character. For objects and arrays, the first and last characters correspond to the opening or closing braces/brackets, respectively. For primitive values, the first and last character represents the opening and closing quotes (strings) or the first and last character of the field's numerical or predefined value (true, false, null), respectively.

    JSON type return value start_pos() return value end_pos() object position of the opening { position after the closing } array position of the opening [ position after the closing ] string position of the opening \" position after the closing \" number position of the first character position after the last character boolean position of t for true and f for false position after e null position of n position after l

    Given the above, end_pos()-start_pos() for a JSON value provides the length of the parsed JSON string for that value, including the opening or closing braces, brackets, or quotes.

    Note that enabling this macro increases the size of every JSON value by two std::size_t fields and adds slight runtime overhead to parsing, copying JSON value objects, and the generation of error messages for exceptions. It also causes these values to be reported in those error messages.

    "},{"location":"api/macros/json_diagnostic_positions/#default-definition","title":"Default definition","text":"

    The default value is 0 (position diagnostics are switched off).

    #define JSON_DIAGNOSTIC_POSITIONS 0\n

    When the macro is not defined, the library will define it to its default value.

    "},{"location":"api/macros/json_diagnostic_positions/#notes","title":"Notes","text":"

    CMake option

    Diagnostic positions can also be controlled with the CMake option JSON_Diagnostic_Positions (OFF by default) which defines JSON_DIAGNOSTIC_POSITIONS accordingly.

    Availability

    Diagnostic positions are only available if the value was created by the parse function. The sax_parse function or all other means to create a JSON value do not set the diagnostic positions and start_pos() and end_pos() will only return std::string::npos for these values.

    Invalidation

    The returned positions are only valid as long as the JSON value is not changed. The positions are not updated when the JSON value is changed.

    "},{"location":"api/macros/json_diagnostic_positions/#examples","title":"Examples","text":"Example: retrieving positions 
    #include <iostream>\n\n#define JSON_DIAGNOSTIC_POSITIONS 1\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    std::string json_string = R\"(\n    {\n        \"address\": {\n            \"street\": \"Fake Street\",\n            \"housenumber\": 1\n        }\n    }\n    )\";\n    json j = json::parse(json_string);\n\n    std::cout << \"Root diagnostic positions: \\n\";\n    std::cout << \"\\tstart_pos: \" << j.start_pos() << '\\n';\n    std::cout << \"\\tend_pos:\" << j.end_pos() << \"\\n\";\n    std::cout << \"Original string: \\n\";\n    std::cout << \"{\\n        \\\"address\\\": {\\n            \\\"street\\\": \\\"Fake Street\\\",\\n            \\\"housenumber\\\": 1\\n        }\\n    }\" << \"\\n\";\n    std::cout << \"Parsed string: \\n\";\n    std::cout << json_string.substr(j.start_pos(), j.end_pos() - j.start_pos()) << \"\\n\\n\";\n\n    std::cout << \"address diagnostic positions: \\n\";\n    std::cout << \"\\tstart_pos:\" << j[\"address\"].start_pos() << '\\n';\n    std::cout << \"\\tend_pos:\" << j[\"address\"].end_pos() << \"\\n\\n\";\n    std::cout << \"Original string: \\n\";\n    std::cout << \"{            \\\"street\\\": \\\"Fake Street\\\",\\n            \\\"housenumber\\\": 1\\n        }\" << \"\\n\";\n    std::cout << \"Parsed string: \\n\";\n    std::cout << json_string.substr(j[\"address\"].start_pos(), j[\"address\"].end_pos() - j[\"address\"].start_pos()) << \"\\n\\n\";\n\n    std::cout << \"street diagnostic positions: \\n\";\n    std::cout << \"\\tstart_pos:\" << j[\"address\"][\"street\"].start_pos() << '\\n';\n    std::cout << \"\\tend_pos:\" << j[\"address\"][\"street\"].end_pos() << \"\\n\\n\";\n    std::cout << \"Original string: \\n\";\n    std::cout << \"\\\"Fake Street\\\"\" << \"\\n\";\n    std::cout << \"Parsed string: \\n\";\n    std::cout << json_string.substr(j[\"address\"][\"street\"].start_pos(), j[\"address\"][\"street\"].end_pos() - j[\"address\"][\"street\"].start_pos()) << \"\\n\\n\";\n\n    std::cout << \"housenumber diagnostic positions: \\n\";\n    std::cout << \"\\tstart_pos:\" << j[\"address\"][\"housenumber\"].start_pos() << '\\n';\n    std::cout << \"\\tend_pos:\" << j[\"address\"][\"housenumber\"].end_pos() << \"\\n\\n\";\n    std::cout << \"Original string: \\n\";\n    std::cout << \"1\" << \"\\n\";\n    std::cout << \"Parsed string: \\n\";\n    std::cout << json_string.substr(j[\"address\"][\"housenumber\"].start_pos(), j[\"address\"][\"housenumber\"].end_pos() - j[\"address\"][\"housenumber\"].start_pos()) << \"\\n\\n\";\n}\n

    Output:

    Root diagnostic positions: \n    start_pos: 5\n    end_pos:109\nOriginal string: \n{\n        \"address\": {\n            \"street\": \"Fake Street\",\n            \"housenumber\": 1\n        }\n    }\nParsed string: \n{\n        \"address\": {\n            \"street\": \"Fake Street\",\n            \"housenumber\": 1\n        }\n    }\n\naddress diagnostic positions: \n    start_pos:26\n    end_pos:103\n\nOriginal string: \n{            \"street\": \"Fake Street\",\n            \"housenumber\": 1\n        }\nParsed string: \n{\n            \"street\": \"Fake Street\",\n            \"housenumber\": 1\n        }\n\nstreet diagnostic positions: \n    start_pos:50\n    end_pos:63\n\nOriginal string: \n\"Fake Street\"\nParsed string: \n\"Fake Street\"\n\nhousenumber diagnostic positions: \n    start_pos:92\n    end_pos:93\n\nOriginal string: \n1\nParsed string: \n1\n

    The output shows the start/end positions of all the objects and fields in the JSON string.

    Example 2: using only diagnostic positions in exceptions 
    #include <iostream>\n\n#define JSON_DIAGNOSTIC_POSITIONS 1\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\n/* Demonstration of type error exception with diagnostic postions support enabled */\nint main()\n{\n    //Invalid json string - housenumber type must be int instead of string\n    const std::string json_invalid_string = R\"(\n    {\n        \"address\": {\n            \"street\": \"Fake Street\",\n            \"housenumber\": \"1\"\n        }\n    }\n    )\";\n    json j = json::parse(json_invalid_string);\n    try\n    {\n        int housenumber = j[\"address\"][\"housenumber\"];\n        std::cout << housenumber;\n    }\n    catch (const json::exception& e)\n    {\n        std::cout << e.what() << '\\n';\n    }\n}\n

    Output:

    [json.exception.type_error.302] (bytes 92-95) type must be number, but is string\n
    The output shows the exception with start/end positions only.\n
    Example 3: using extended diagnostics with positions enabled in exceptions 
    #include <iostream>\n\n#define JSON_DIAGNOSTICS 1\n#define JSON_DIAGNOSTIC_POSITIONS 1\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\n/* Demonstration of type error exception with diagnostic postions support enabled */\nint main()\n{\n    //Invalid json string - housenumber type must be int instead of string\n    const std::string json_invalid_string = R\"(\n    {\n        \"address\": {\n            \"street\": \"Fake Street\",\n            \"housenumber\": \"1\"\n        }\n    }\n    )\";\n    json j = json::parse(json_invalid_string);\n    try\n    {\n        int housenumber = j[\"address\"][\"housenumber\"];\n        std::cout << housenumber;\n    }\n    catch (const json::exception& e)\n    {\n        std::cout << e.what() << '\\n';\n    }\n}\n

    Output:

    [json.exception.type_error.302] (/address/housenumber) (bytes 92-95) type must be number, but is string\n
    The output shows the exception with diagnostic path info and start/end positions.\n
    "},{"location":"api/macros/json_diagnostic_positions/#see-also","title":"See also","text":"
    • JSON_Diagnostic_Positions - CMake option to control the macro
    • JSON_DIAGNOSTICS - macro to control extended diagnostics
    "},{"location":"api/macros/json_diagnostic_positions/#version-history","title":"Version history","text":"
    • Added in version 3.12.0.
    "},{"location":"api/macros/json_diagnostics/","title":"JSON_DIAGNOSTICS","text":"
    #define JSON_DIAGNOSTICS /* value */\n

    This macro enables extended diagnostics for exception messages. Possible values are 1 to enable or 0 to disable (default).

    When enabled, exception messages contain a JSON Pointer to the JSON value that triggered the exception. Note that enabling this macro increases the size of every JSON value by one pointer and adds some runtime overhead.

    "},{"location":"api/macros/json_diagnostics/#default-definition","title":"Default definition","text":"

    The default value is 0 (extended diagnostics are switched off).

    #define JSON_DIAGNOSTICS 0\n

    When the macro is not defined, the library will define it to its default value.

    "},{"location":"api/macros/json_diagnostics/#notes","title":"Notes","text":"

    ABI compatibility

    As of version 3.11.0, this macro is no longer required to be defined consistently throughout a codebase to avoid One Definition Rule (ODR) violations, as the value of this macro is encoded in the namespace, resulting in distinct symbol names.

    This allows different parts of a codebase to use different versions or configurations of this library without causing improper behavior.

    Where possible, it is still recommended that all code define this the same way for maximum interoperability.

    CMake option

    Diagnostic messages can also be controlled with the CMake option JSON_Diagnostics (OFF by default) which defines JSON_DIAGNOSTICS accordingly.

    "},{"location":"api/macros/json_diagnostics/#examples","title":"Examples","text":"Example 1: default behavior 
    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    json j;\n    j[\"address\"][\"street\"] = \"Fake Street\";\n    j[\"address\"][\"housenumber\"] = \"12\";\n\n    try\n    {\n        int housenumber = j[\"address\"][\"housenumber\"];\n    }\n    catch (const json::exception& e)\n    {\n        std::cout << e.what() << '\\n';\n    }\n}\n

    Output:

    [json.exception.type_error.302] type must be number, but is string\n

    This exception can be hard to debug if storing the value \"12\" and accessing it is further apart.

    Example 2: extended diagnostic messages 
    #include <iostream>\n\n# define JSON_DIAGNOSTICS 1\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    json j;\n    j[\"address\"][\"street\"] = \"Fake Street\";\n    j[\"address\"][\"housenumber\"] = \"12\";\n\n    try\n    {\n        int housenumber = j[\"address\"][\"housenumber\"];\n    }\n    catch (const json::exception& e)\n    {\n        std::cout << e.what() << '\\n';\n    }\n}\n

    Output:

    [json.exception.type_error.302] (/address/housenumber) type must be number, but is string\n

    Now the exception message contains a JSON Pointer /address/housenumber that indicates which value has the wrong type.

    Example 3: using only diagnostic positions in exceptions 
    #include <iostream>\n\n#define JSON_DIAGNOSTIC_POSITIONS 1\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\n/* Demonstration of type error exception with diagnostic postions support enabled */\nint main()\n{\n    //Invalid json string - housenumber type must be int instead of string\n    const std::string json_invalid_string = R\"(\n    {\n        \"address\": {\n            \"street\": \"Fake Street\",\n            \"housenumber\": \"1\"\n        }\n    }\n    )\";\n    json j = json::parse(json_invalid_string);\n    try\n    {\n        int housenumber = j[\"address\"][\"housenumber\"];\n        std::cout << housenumber;\n    }\n    catch (const json::exception& e)\n    {\n        std::cout << e.what() << '\\n';\n    }\n}\n

    Output:

    [json.exception.type_error.302] (bytes 92-95) type must be number, but is string\n
    The output shows the exception with start/end positions only.

    "},{"location":"api/macros/json_diagnostics/#see-also","title":"See also","text":"
    • JSON_Diagnostics - CMake option to control the macro
    • JSON_DIAGNOSTIC_POSITIONS - macro to access positions of elements
    "},{"location":"api/macros/json_diagnostics/#version-history","title":"Version history","text":"
    • Added in version 3.10.0.
    • As of version 3.11.0, the definition is allowed to vary between translation units.
    "},{"location":"api/macros/json_disable_enum_serialization/","title":"JSON_DISABLE_ENUM_SERIALIZATION","text":"
    #define JSON_DISABLE_ENUM_SERIALIZATION /* value */\n

    When defined to 1, default serialization and deserialization functions for enums are excluded and have to be provided by the user, for example, using NLOHMANN_JSON_SERIALIZE_ENUM (see arbitrary type conversions for more details).

    Parsing or serializing an enum will result in a compiler error.

    This works for both unscoped and scoped enums.

    "},{"location":"api/macros/json_disable_enum_serialization/#default-definition","title":"Default definition","text":"

    The default value is 0.

    #define JSON_DISABLE_ENUM_SERIALIZATION 0\n
    "},{"location":"api/macros/json_disable_enum_serialization/#notes","title":"Notes","text":"

    CMake option

    Enum serialization can also be controlled with the CMake option JSON_DisableEnumSerialization (OFF by default) which defines JSON_DISABLE_ENUM_SERIALIZATION accordingly.

    "},{"location":"api/macros/json_disable_enum_serialization/#examples","title":"Examples","text":"Example 1: Disabled behavior

    The code below forces the library not to create default serialization/deserialization functions from_json and to_json, meaning the code below does not compile.

    #define JSON_DISABLE_ENUM_SERIALIZATION 1\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nenum class Choice\n{\n    first,\n    second,\n};\n\nint main()\n{\n    // normally invokes to_json serialization function but with JSON_DISABLE_ENUM_SERIALIZATION defined, it does not\n    const json j = Choice::first; \n\n    // normally invokes from_json parse function but with JSON_DISABLE_ENUM_SERIALIZATION defined, it does not\n    Choice ch = j.template get<Choice>();\n}\n
    Example 2: Serialize enum macro

    The code below forces the library not to create default serialization/deserialization functions from_json and to_json, but uses NLOHMANN_JSON_SERIALIZE_ENUM to parse and serialize the enum.

    #define JSON_DISABLE_ENUM_SERIALIZATION 1\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nenum class Choice\n{\n    first,\n    second,\n};\n\nNLOHMANN_JSON_SERIALIZE_ENUM(Choice,\n{\n    { Choice::first, \"first\" },\n    { Choice::second, \"second\" },\n})\n\nint main()\n{\n    // uses user-defined to_json function defined by macro\n    const json j = Choice::first; \n\n    // uses user-defined from_json function defined by macro\n    Choice ch = j.template get<Choice>();\n}\n
    Example 3: User-defined serialization/deserialization functions

    The code below forces the library not to create default serialization/deserialization functions from_json and to_json, but uses user-defined functions to parse and serialize the enum.

    #define JSON_DISABLE_ENUM_SERIALIZATION 1\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nenum class Choice\n{\n    first,\n    second,\n};\n\nvoid from_json(const json& j, Choice& ch)\n{\n    auto value = j.template get<std::string>();\n    if (value == \"first\")\n    {\n        ch = Choice::first;\n    }\n    else if (value == \"second\")\n    {\n        ch = Choice::second;\n    }\n}\n\nvoid to_json(json& j, const Choice& ch)\n{\n    auto value = j.template get<std::string>();\n    if (value == \"first\")\n    {\n        ch = Choice::first;\n    }\n    else if (value == \"second\")\n    {\n        ch = Choice::second;\n    }\n}\n\nint main()\n{\n    // uses user-defined to_json function\n    const json j = Choice::first; \n\n    // uses user-defined from_json function\n    Choice ch = j.template get<Choice>();\n}\n
    "},{"location":"api/macros/json_disable_enum_serialization/#see-also","title":"See also","text":"
    • JSON_DisableEnumSerialization - CMake option to control the macro
    • NLOHMANN_JSON_SERIALIZE_ENUM - serialize/deserialize an enum
    "},{"location":"api/macros/json_disable_enum_serialization/#version-history","title":"Version history","text":"
    • Added in version 3.11.0.
    "},{"location":"api/macros/json_has_cpp_11/","title":"JSON_HAS_CPP_11, JSON_HAS_CPP_14, JSON_HAS_CPP_17, JSON_HAS_CPP_20","text":"
    #define JSON_HAS_CPP_11\n#define JSON_HAS_CPP_14\n#define JSON_HAS_CPP_17\n#define JSON_HAS_CPP_20\n

    The library targets C++11, but also supports some features introduced in later C++ versions (e.g., std::string_view support for C++17). For these new features, the library implements some preprocessor checks to determine the C++ standard. By defining any of these symbols, the internal check is overridden and the provided C++ version is unconditionally assumed. This can be helpful for compilers that only implement parts of the standard and would be detected incorrectly.

    "},{"location":"api/macros/json_has_cpp_11/#default-definition","title":"Default definition","text":"

    The default value is detected based on preprocessor macros such as __cplusplus, _HAS_CXX17, or _MSVC_LANG.

    "},{"location":"api/macros/json_has_cpp_11/#notes","title":"Notes","text":"
    • JSON_HAS_CPP_11 is always defined.
    • All macros are undefined outside the library.
    "},{"location":"api/macros/json_has_cpp_11/#examples","title":"Examples","text":"Example

    The code below forces the library to use the C++14 standard:

    #define JSON_HAS_CPP_14 1\n#include <nlohmann/json.hpp>\n\n...\n
    "},{"location":"api/macros/json_has_cpp_11/#version-history","title":"Version history","text":"
    • Added in version 3.10.5.
    "},{"location":"api/macros/json_has_filesystem/","title":"JSON_HAS_FILESYSTEM / JSON_HAS_EXPERIMENTAL_FILESYSTEM","text":"
    #define JSON_HAS_FILESYSTEM /* value */\n#define JSON_HAS_EXPERIMENTAL_FILESYSTEM /* value */\n

    When compiling with C++17, the library provides conversions from and to std::filesystem::path. As compiler support for filesystem is limited, the library tries to detect whether <filesystem>/std::filesystem (JSON_HAS_FILESYSTEM) or <experimental/filesystem>/std::experimental::filesystem (JSON_HAS_EXPERIMENTAL_FILESYSTEM) should be used. To override the built-in check, define JSON_HAS_FILESYSTEM or JSON_HAS_EXPERIMENTAL_FILESYSTEM to 1.

    "},{"location":"api/macros/json_has_filesystem/#default-definition","title":"Default definition","text":"

    The default value is detected based on the preprocessor macros __cpp_lib_filesystem, __cpp_lib_experimental_filesystem, __has_include(<filesystem>), or __has_include(<experimental/filesystem>).

    "},{"location":"api/macros/json_has_filesystem/#notes","title":"Notes","text":"
    • Note that older compilers or older versions of libstd++ also require the library stdc++fs to be linked to for filesystem support.
    • Both macros are undefined outside the library.
    "},{"location":"api/macros/json_has_filesystem/#examples","title":"Examples","text":"Example

    The code below forces the library to use the header <experimental/filesystem>.

    #define JSON_HAS_EXPERIMENTAL_FILESYSTEM 1\n#include <nlohmann/json.hpp>\n\n...\n
    "},{"location":"api/macros/json_has_filesystem/#version-history","title":"Version history","text":"
    • Added in version 3.10.5.
    "},{"location":"api/macros/json_has_ranges/","title":"JSON_HAS_RANGES","text":"
    #define JSON_HAS_RANGES /* value */\n

    This macro indicates whether the standard library has any support for ranges. Implies support for concepts. Possible values are 1 when supported or 0 when unsupported.

    "},{"location":"api/macros/json_has_ranges/#default-definition","title":"Default definition","text":"

    The default value is detected based on the preprocessor macro __cpp_lib_ranges.

    When the macro is not defined, the library will define it to its default value.

    "},{"location":"api/macros/json_has_ranges/#examples","title":"Examples","text":"Example

    The code below forces the library to enable support for ranges:

    #define JSON_HAS_RANGES 1\n#include <nlohmann/json.hpp>\n\n...\n
    "},{"location":"api/macros/json_has_ranges/#version-history","title":"Version history","text":"
    • Added in version 3.11.0.
    "},{"location":"api/macros/json_has_static_rtti/","title":"JSON_HAS_STATIC_RTTI","text":"
    #define JSON_HAS_STATIC_RTTI /* value */\n

    This macro indicates whether the standard library has any support for RTTI (run time type information). Possible values are 1 when supported or 0 when unsupported.

    "},{"location":"api/macros/json_has_static_rtti/#default-definition","title":"Default definition","text":"

    The default value is detected based on the preprocessor macro _HAS_STATIC_RTTI.

    When the macro is not defined, the library will define it to its default value.

    "},{"location":"api/macros/json_has_static_rtti/#examples","title":"Examples","text":"Example

    The code below forces the library to enable support for libraries with RTTI dependence:

    #define JSON_HAS_STATIC_RTTI 1\n#include <nlohmann/json.hpp>\n\n...\n
    "},{"location":"api/macros/json_has_static_rtti/#version-history","title":"Version history","text":"
    • Added in version 3.11.3.
    "},{"location":"api/macros/json_has_three_way_comparison/","title":"JSON_HAS_THREE_WAY_COMPARISON","text":"
    #define JSON_HAS_THREE_WAY_COMPARISON /* value */\n

    This macro indicates whether the compiler and standard library support 3-way comparison. Possible values are 1 when supported or 0 when unsupported.

    "},{"location":"api/macros/json_has_three_way_comparison/#default-definition","title":"Default definition","text":"

    The default value is detected based on the preprocessor macros __cpp_impl_three_way_comparison and __cpp_lib_three_way_comparison.

    When the macro is not defined, the library will define it to its default value.

    "},{"location":"api/macros/json_has_three_way_comparison/#examples","title":"Examples","text":"Example

    The code below forces the library to use 3-way comparison:

    #define JSON_HAS_THREE_WAY_COMPARISON 1\n#include <nlohmann/json.hpp>\n\n...\n
    "},{"location":"api/macros/json_has_three_way_comparison/#version-history","title":"Version history","text":"
    • Added in version 3.11.0.
    "},{"location":"api/macros/json_no_io/","title":"JSON_NO_IO","text":"
    #define JSON_NO_IO\n

    When defined, headers <cstdio>, <ios>, <iosfwd>, <istream>, and <ostream> are not included and parse functions relying on these headers are excluded. This is relevant for environments where these I/O functions are disallowed for security reasons (e.g., Intel Software Guard Extensions (SGX)).

    "},{"location":"api/macros/json_no_io/#default-definition","title":"Default definition","text":"

    By default, JSON_NO_IO is not defined.

    #undef JSON_NO_IO\n
    "},{"location":"api/macros/json_no_io/#examples","title":"Examples","text":"Example

    The code below forces the library not to use the headers <cstdio>, <ios>, <iosfwd>, <istream>, and <ostream>.

    #define JSON_NO_IO 1\n#include <nlohmann/json.hpp>\n\n...\n
    "},{"location":"api/macros/json_no_io/#version-history","title":"Version history","text":"
    • Added in version 3.10.0.
    "},{"location":"api/macros/json_noexception/","title":"JSON_NOEXCEPTION","text":"
    #define JSON_NOEXCEPTION\n

    Exceptions can be switched off by defining the symbol JSON_NOEXCEPTION. When defining JSON_NOEXCEPTION, try is replaced by if (true), catch is replaced by if (false), and throw is replaced by std::abort().

    The same effect is achieved by setting the compiler flag -fno-exceptions.

    "},{"location":"api/macros/json_noexception/#default-definition","title":"Default definition","text":"

    By default, the macro is not defined.

    #undef JSON_NOEXCEPTION\n
    "},{"location":"api/macros/json_noexception/#notes","title":"Notes","text":"

    The explanatory what() string of exceptions is not available for MSVC if exceptions are disabled, see #2824.

    "},{"location":"api/macros/json_noexception/#examples","title":"Examples","text":"Example

    The code below switches off exceptions in the library.

    #define JSON_NOEXCEPTION 1\n#include <nlohmann/json.hpp>\n\n...\n
    "},{"location":"api/macros/json_noexception/#see-also","title":"See also","text":"
    • Switch off exceptions for more information how to switch off exceptions
    "},{"location":"api/macros/json_noexception/#version-history","title":"Version history","text":"

    Added in version 2.1.0.

    "},{"location":"api/macros/json_skip_library_version_check/","title":"JSON_SKIP_LIBRARY_VERSION_CHECK","text":"
    #define JSON_SKIP_LIBRARY_VERSION_CHECK\n

    When defined, the library will not create a compiler warning when a different version of the library was already included.

    "},{"location":"api/macros/json_skip_library_version_check/#default-definition","title":"Default definition","text":"

    By default, the macro is not defined.

    #undef JSON_SKIP_LIBRARY_VERSION_CHECK\n
    "},{"location":"api/macros/json_skip_library_version_check/#notes","title":"Notes","text":"

    ABI compatibility

    Mixing different library versions in the same code can be a problem as the different versions may not be ABI compatible.

    "},{"location":"api/macros/json_skip_library_version_check/#examples","title":"Examples","text":"

    Example

    The following warning will be shown in case a different version of the library was already included:

    Already included a different version of the library!\n
    "},{"location":"api/macros/json_skip_library_version_check/#version-history","title":"Version history","text":"

    Added in version 3.11.0.

    "},{"location":"api/macros/json_skip_unsupported_compiler_check/","title":"JSON_SKIP_UNSUPPORTED_COMPILER_CHECK","text":"
    #define JSON_SKIP_UNSUPPORTED_COMPILER_CHECK\n

    When defined, the library will not create a compile error when a known unsupported compiler is detected. This allows using the library with compilers that do not fully support C++11 and may only work if unsupported features are not used.

    "},{"location":"api/macros/json_skip_unsupported_compiler_check/#default-definition","title":"Default definition","text":"

    By default, the macro is not defined.

    #undef JSON_SKIP_UNSUPPORTED_COMPILER_CHECK\n
    "},{"location":"api/macros/json_skip_unsupported_compiler_check/#examples","title":"Examples","text":"Example

    The code below switches off the check whether the compiler is supported.

    #define JSON_SKIP_UNSUPPORTED_COMPILER_CHECK 1\n#include <nlohmann/json.hpp>\n\n...\n
    "},{"location":"api/macros/json_skip_unsupported_compiler_check/#version-history","title":"Version history","text":"

    Added in version 3.2.0.

    "},{"location":"api/macros/json_throw_user/","title":"JSON_CATCH_USER, JSON_THROW_USER, JSON_TRY_USER","text":"
    // (1)\n#define JSON_CATCH_USER(exception) /* value */\n// (2)\n#define JSON_THROW_USER(exception) /* value */\n// (3)\n#define JSON_TRY_USER /* value */\n

    Controls how exceptions are handled by the library.

    1. This macro overrides catch calls inside the library. The argument is the type of the exception to catch. As of version 3.8.0, the library only catches std::out_of_range exceptions internally to rethrow them as json::out_of_range exceptions. The macro is always followed by a scope.
    2. This macro overrides throw calls inside the library. The argument is the exception to be thrown. Note that JSON_THROW_USER should leave the current scope (e.g., by throwing or aborting), as continuing after it may yield undefined behavior.
    3. This macro overrides try calls inside the library. It has no arguments and is always followed by a scope.
    "},{"location":"api/macros/json_throw_user/#parameters","title":"Parameters","text":"exception (in) an exception type"},{"location":"api/macros/json_throw_user/#default-definition","title":"Default definition","text":"

    By default, the macros map to their respective C++ keywords:

    #define JSON_CATCH_USER(exception) catch(exception)\n#define JSON_THROW_USER(exception) throw exception\n#define JSON_TRY_USER              try\n

    When exceptions are switched off, the try block is executed unconditionally, and throwing exceptions is replaced by calling std::abort to make reaching the throw branch abort the process.

    #define JSON_THROW_USER(exception) std::abort()\n#define JSON_TRY_USER              if (true)\n#define JSON_CATCH_USER(exception) if (false)\n
    "},{"location":"api/macros/json_throw_user/#examples","title":"Examples","text":"Example

    The code below switches off exceptions and creates a log entry with a detailed error message in case of errors.

    #include <iostream>\n\n#define JSON_TRY_USER if(true)\n#define JSON_CATCH_USER(exception) if(false)\n#define JSON_THROW_USER(exception)                           \\\n    {std::clog << \"Error in \" << __FILE__ << \":\" << __LINE__ \\\n               << \" (function \" << __FUNCTION__ << \") - \"    \\\n               << (exception).what() << std::endl;           \\\n     std::abort();}\n\n#include <nlohmann/json.hpp>\n
    "},{"location":"api/macros/json_throw_user/#see-also","title":"See also","text":"
    • Switch off exceptions for more information how to switch off exceptions
    • JSON_NOEXCEPTION - switch off exceptions
    "},{"location":"api/macros/json_throw_user/#version-history","title":"Version history","text":"
    • Added in version 3.1.0.
    "},{"location":"api/macros/json_use_global_udls/","title":"JSON_USE_GLOBAL_UDLS","text":"
    #define JSON_USE_GLOBAL_UDLS /* value */\n

    When defined to 1, the user-defined string literals (UDLs) are placed into the global namespace instead of nlohmann::literals::json_literals.

    "},{"location":"api/macros/json_use_global_udls/#default-definition","title":"Default definition","text":"

    The default value is 1.

    #define JSON_USE_GLOBAL_UDLS 1\n

    When the macro is not defined, the library will define it to its default value.

    "},{"location":"api/macros/json_use_global_udls/#notes","title":"Notes","text":"

    Future behavior change

    The user-defined string literals will be removed from the global namespace in the next major release of the library.

    To prepare existing code, define JSON_USE_GLOBAL_UDLS to 0 and bring the string literals into scope where needed. Refer to any of the string literals for details.

    CMake option

    The placement of user-defined string literals can also be controlled with the CMake option JSON_GlobalUDLs (ON by default) which defines JSON_USE_GLOBAL_UDLS accordingly.

    "},{"location":"api/macros/json_use_global_udls/#examples","title":"Examples","text":"Example 1: Default behavior

    The code below shows the default behavior using the _json UDL.

    #include <nlohmann/json.hpp>\n\n#include <iostream>\n\nint main()\n{\n    auto j = \"42\"_json;\n\n    std::cout << j << std::endl;\n}\n

    Output:

    42\n
    Example 2: Namespaced UDLs

    The code below shows how UDLs need to be brought into scope before using _json when JSON_USE_GLOBAL_UDLS is defined to 0.

    #define JSON_USE_GLOBAL_UDLS 0\n#include <nlohmann/json.hpp>\n\n#include <iostream>\n\nint main()\n{\n    // auto j = \"42\"_json; // This line would fail to compile,\n                           // because the UDLs are not in the global namespace\n\n    // Bring the UDLs into scope\n    using namespace nlohmann::json_literals;\n\n    auto j = \"42\"_json;\n\n    std::cout << j << std::endl;\n}\n

    Output:

    42\n
    "},{"location":"api/macros/json_use_global_udls/#see-also","title":"See also","text":"
    • operator\"\"_json
    • operator\"\"_json_pointer
    • JSON_GlobalUDLs - CMake option to control the macro
    "},{"location":"api/macros/json_use_global_udls/#version-history","title":"Version history","text":"
    • Added in version 3.11.0.
    "},{"location":"api/macros/json_use_implicit_conversions/","title":"JSON_USE_IMPLICIT_CONVERSIONS","text":"
    #define JSON_USE_IMPLICIT_CONVERSIONS /* value */\n

    When defined to 0, implicit conversions are switched off. By default, implicit conversions are switched on. The value directly affects operator ValueType.

    "},{"location":"api/macros/json_use_implicit_conversions/#default-definition","title":"Default definition","text":"

    By default, implicit conversions are enabled.

    #define JSON_USE_IMPLICIT_CONVERSIONS 1\n
    "},{"location":"api/macros/json_use_implicit_conversions/#notes","title":"Notes","text":"

    Future behavior change

    Implicit conversions will be switched off by default in the next major release of the library.

    You can prepare existing code by already defining JSON_USE_IMPLICIT_CONVERSIONS to 0 and replace any implicit conversions with calls to get.

    CMake option

    Implicit conversions can also be controlled with the CMake option JSON_ImplicitConversions (ON by default) which defines JSON_USE_IMPLICIT_CONVERSIONS accordingly.

    "},{"location":"api/macros/json_use_implicit_conversions/#examples","title":"Examples","text":"Example

    This is an example for an implicit conversion:

    json j = \"Hello, world!\";\nstd::string s = j;\n

    When JSON_USE_IMPLICIT_CONVERSIONS is defined to 0, the code above does no longer compile. Instead, it must be written like this:

    json j = \"Hello, world!\";\nauto s = j.template get<std::string>();\n
    "},{"location":"api/macros/json_use_implicit_conversions/#see-also","title":"See also","text":"
    • operator ValueType - get a value (implicit)
    • get - get a value (explicit)
    • JSON_ImplicitConversions - CMake option to control the macro
    "},{"location":"api/macros/json_use_implicit_conversions/#version-history","title":"Version history","text":"
    • Added in version 3.9.0.
    "},{"location":"api/macros/json_use_legacy_discarded_value_comparison/","title":"JSON_USE_LEGACY_DISCARDED_VALUE_COMPARISON","text":"
    #define JSON_USE_LEGACY_DISCARDED_VALUE_COMPARISON /* value */\n

    This macro enables the (incorrect) legacy comparison behavior of discarded JSON values. Possible values are 1 to enable or 0 to disable (default).

    When enabled, comparisons involving at least one discarded JSON value yield results as follows:

    Operator Result == false != true < false <= true >= true > false

    Otherwise, comparisons involving at least one discarded JSON value always yield false.

    "},{"location":"api/macros/json_use_legacy_discarded_value_comparison/#default-definition","title":"Default definition","text":"

    The default value is 0.

    #define JSON_USE_LEGACY_DISCARDED_VALUE_COMPARISON 0\n

    When the macro is not defined, the library will define it to its default value.

    "},{"location":"api/macros/json_use_legacy_discarded_value_comparison/#notes","title":"Notes","text":"

    Inconsistent behavior in C++20 and beyond

    When targeting C++20 or above, enabling the legacy comparison behavior is strongly discouraged.

    • The 3-way comparison operator (<=>) will always give the correct result (std::partial_ordering::unordered) regardless of the value of JSON_USE_LEGACY_DISCARDED_VALUE_COMPARISON.
    • Overloads for the equality and relational operators emulate the legacy behavior.

    Code outside your control may use either 3-way comparison or the equality and relational operators, resulting in inconsistent and unpredictable behavior.

    See operator<=> for more information on 3-way comparison.

    Deprecation

    The legacy comparison behavior is deprecated and may be removed in a future major version release.

    New code should not depend on it and existing code should try to remove or rewrite expressions relying on it.

    CMake option

    Legacy comparison can also be controlled with the CMake option JSON_LegacyDiscardedValueComparison (OFF by default) which defines JSON_USE_LEGACY_DISCARDED_VALUE_COMPARISON accordingly.

    "},{"location":"api/macros/json_use_legacy_discarded_value_comparison/#examples","title":"Examples","text":"Example

    The code below switches on the legacy discarded value comparison behavior in the library.

    #define JSON_USE_LEGACY_DISCARDED_VALUE_COMPARISON 1\n#include <nlohmann/json.hpp>\n\n...\n
    "},{"location":"api/macros/json_use_legacy_discarded_value_comparison/#see-also","title":"See also","text":"
    • JSON_LegacyDiscardedValueComparison - CMake option to control the macro
    "},{"location":"api/macros/json_use_legacy_discarded_value_comparison/#version-history","title":"Version history","text":"
    • Added in version 3.11.0.
    "},{"location":"api/macros/nlohmann_define_derived_type/","title":"NLOHMANN_DEFINE_DERIVED_TYPE_INTRUSIVE, NLOHMANN_DEFINE_DERIVED_TYPE_INTRUSIVE_WITH_DEFAULT, NLOHMANN_DEFINE_DERIVED_TYPE_INTRUSIVE_ONLY_SERIALIZE, NLOHMANN_DEFINE_DERIVED_TYPE_NON_INTRUSIVE, NLOHMANN_DEFINE_DERIVED_TYPE_NON_INTRUSIVE_WITH_DEFAULT, NLOHMANN_DEFINE_DERIVED_TYPE_NON_INTRUSIVE_ONLY_SERIALIZE","text":"NLOHMANN_DEFINE_DERIVED_TYPE_INTRUSIVE, NLOHMANN_DEFINE_DERIVED_TYPE_INTRUSIVE_WITH_DEFAULT, NLOHMANN_DEFINE_DERIVED_TYPE_INTRUSIVE_ONLY_SERIALIZE, NLOHMANN_DEFINE_DERIVED_TYPE_NON_INTRUSIVE, NLOHMANN_DEFINE_DERIVED_TYPE_NON_INTRUSIVE_WITH_DEFAULT, NLOHMANN_DEFINE_DERIVED_TYPE_NON_INTRUSIVE_ONLY_SERIALIZE 
    // (1)\n#define NLOHMANN_DEFINE_DERIVED_TYPE_INTRUSIVE(type, base_type, member...)\n// (2)\n#define NLOHMANN_DEFINE_DERIVED_TYPE_INTRUSIVE_WITH_DEFAULT(type, base_type, member...)\n// (3)\n#define NLOHMANN_DEFINE_DERIVED_TYPE_INTRUSIVE_ONLY_SERIALIZE(type, base_type, member...)\n\n// (4)\n#define NLOHMANN_DEFINE_DERIVED_TYPE_NON_INTRUSIVE(type, base_type, member...)\n// (5)\n#define NLOHMANN_DEFINE_DERIVED_TYPE_NON_INTRUSIVE_WITH_DEFAULT(type, base_type, member...)\n// (6)\n#define NLOHMANN_DEFINE_DERIVED_TYPE_NON_INTRUSIVE_ONLY_SERIALIZE(type, base_type, member...)\n

    These macros can be used to simplify the serialization/deserialization of derived types if you want to use a JSON object as serialization and want to use the member variable names as object keys in that object.

    • Macros 1, 2, and 3 are to be defined inside the class/struct to create code for. Like NLOHMANN_DEFINE_TYPE_INTRUSIVE, they can access private members.
    • Macros 4, 5, and 6 are to be defined outside the class/struct to create code for, but inside its namespace. Like NLOHMANN_DEFINE_TYPE_NON_INTRUSIVE, they cannot access private members.

    The first parameter is the name of the derived class/struct, the second parameter is the name of the base class/struct and all remaining parameters name the members. The base type must be already serializable/deserializable.

    • Macros 1 and 4 will use at during deserialization and will throw out_of_range.403 if a key is missing in the JSON object.
    • Macros 2 and 5 will use value during deserialization and fall back to the default value for the respective type of the member variable if a key in the JSON object is missing. The generated from_json() function default constructs an object and uses its values as the defaults when calling the value function.

    Summary:

    Need access to private members Need only de-serialization Allow missing values when de-serializing macro NLOHMANN_DEFINE_DERIVED_TYPE_INTRUSIVE NLOHMANN_DEFINE_DERIVED_TYPE_INTRUSIVE_WITH_DEFAULT NLOHMANN_DEFINE_DERIVED_TYPE_INTRUSIVE_ONLY_SERIALIZE NLOHMANN_DEFINE_DERIVED_TYPE_NON_INTRUSIVE NLOHMANN_DEFINE_DERIVED_TYPE_NON_INTRUSIVE_WITH_DEFAULT NLOHMANN_DEFINE_DERIVED_TYPE_NON_INTRUSIVE_ONLY_SERIALIZE"},{"location":"api/macros/nlohmann_define_derived_type/#parameters","title":"Parameters","text":"type (in) name of the type (class, struct) to serialize/deserialize base_type (in) name of the base type (class, struct) type is derived from member (in) name of the member variable to serialize/deserialize; up to 64 members can be given as a comma-separated list"},{"location":"api/macros/nlohmann_define_derived_type/#default-definition","title":"Default definition","text":"

    Macros 1 and 2 add two friend functions to the class which take care of the serialization and deserialization:

    template<typename BasicJsonType>\nfriend void to_json(BasicJsonType&, const type&);\ntemplate<typename BasicJsonType>\nfriend void from_json(const BasicJsonType&, type&);\n

    Macros 4 and 5 add two functions to the namespace which take care of the serialization and deserialization:

    template<typename BasicJsonType>\nvoid to_json(BasicJsonType&, const type&);\ntemplate<typename BasicJsonType>\nvoid from_json(const BasicJsonType&, type&);\n

    Macros 3 and 6 add one function to the namespace, which takes care of the serialization only:

    template<typename BasicJsonType>\nvoid to_json(BasicJsonType&, const type&);\n

    In first two cases, they call the to_json/from_json functions of the base type before serializing/deserializing the members of the derived type:

    class A { /* ... */ };\nclass B : public A { /* ... */ };\n\ntemplate<typename BasicJsonType>\nvoid to_json(BasicJsonType& j, const B& b) {\n    nlohmann::to_json(j, static_cast<const A&>(b));\n    // ...\n}\n\ntemplate<typename BasicJsonType>\nvoid from_json(const BasicJsonType& j, B& b) {\n    nlohmann::from_json(j, static_cast<A&>(b));\n    // ...\n}\n

    In the third case, only to_json will be called:

    class A { /* ... */ };\nclass B : public A { /* ... */ };\n\ntemplate<typename BasicJsonType>\nvoid to_json(BasicJsonType& j, const B& b) {\n    nlohmann::to_json(j, static_cast<const A&>(b));\n    // ...\n}\n
    "},{"location":"api/macros/nlohmann_define_derived_type/#notes","title":"Notes","text":"

    Prerequisites

    • Macros 1, 2, and 3 have the same prerequisites of NLOHMANN_DEFINE_TYPE_INTRUSIVE.
    • Macros 4, 5, and 6 have the same prerequisites of NLOHMANN_DEFINE_TYPE_NON_INTRUSIVE.
    • Serialization/deserialization of base types must be defined.

    Implementation limits

    See Implementation limits for NLOHMANN_DEFINE_TYPE_INTRUSIVE and NLOHMANN_DEFINE_TYPE_NON_INTRUSIVE, respectively.

    "},{"location":"api/macros/nlohmann_define_derived_type/#examples","title":"Examples","text":"NLOHMANN_DEFINE_DERIVED_TYPE_INTRUSIVE

    Consider the following complete example:

    #include <iostream>\n#include <iomanip>\n#include <nlohmann/json.hpp>\n\nusing nlohmann::json;\n\nclass A\n{\n  private:\n    double Aa = 0.0;\n    double Ab = 0.0;\n\n  public:\n    A() = default;\n    A(double a, double b) : Aa(a), Ab(b) {}\n    NLOHMANN_DEFINE_TYPE_INTRUSIVE(A, Aa, Ab)\n};\n\nclass B : public A\n{\n  private:\n    int Ba = 0;\n    int Bb = 0;\n\n  public:\n    B() = default;\n    B(int a, int b, double aa, double ab) : A(aa, ab), Ba(a), Bb(b) {}\n    NLOHMANN_DEFINE_DERIVED_TYPE_INTRUSIVE(B, A, Ba, Bb)\n};\n\nint main()\n{\n    B example(23, 42, 3.142, 1.777);\n    json example_json = example;\n\n    std::cout << std::setw(4) << example_json << std::endl;\n}\n

    Output:

    {\n    \"Aa\": 3.142,\n    \"Ab\": 1.777,\n    \"Ba\": 23,\n    \"Bb\": 42\n}\n

    Notes:

    • A and B are default-constructible. This is a requirement for using the macro.
    • A has private members and is not a derived class. Hence, macro NLOHMANN_DEFINE_TYPE_INTRUSIVE is used.
    • As B is a derived class, NLOHMANN_DEFINE_TYPE_INTRUSIVE is not applicable, but NLOHMANN_DEFINE_DERIVED_TYPE_INTRUSIVE must be used.
    • The macro NLOHMANN_DEFINE_DERIVED_TYPE_INTRUSIVE is used inside the class use as NLOHMANN_DEFINE_TYPE_INTRUSIVE.
    "},{"location":"api/macros/nlohmann_define_derived_type/#see-also","title":"See also","text":"
    • NLOHMANN_DEFINE_TYPE_INTRUSIVE / NLOHMANN_DEFINE_TYPE_INTRUSIVE_WITH_DEFAULT / NLOHMANN_DEFINE_DERIVED_TYPE_INTRUSIVE_ONLY_SERIALIZE for similar macros that can be defined inside a non-derived type.
    • NLOHMANN_DEFINE_TYPE_NON_INTRUSIVE / NLOHMANN_DEFINE_TYPE_NON_INTRUSIVE_WITH_DEFAULT / NLOHMANN_DEFINE_DERIVED_TYPE_NON_INTRUSIVE_ONLY_SERIALIZE for similar macros that can be defined outside a non-derived type.
    • Arbitrary Type Conversions for an overview.
    "},{"location":"api/macros/nlohmann_define_derived_type/#version-history","title":"Version history","text":"
    1. Added in version 3.12.0.
    2. Added in version 3.12.0.
    3. Added in version 3.12.0.
    4. Added in version 3.12.0.
    5. Added in version 3.12.0.
    6. Added in version 3.12.0.
    "},{"location":"api/macros/nlohmann_define_type_intrusive/","title":"NLOHMANN_DEFINE_TYPE_INTRUSIVE, NLOHMANN_DEFINE_TYPE_INTRUSIVE_WITH_DEFAULT, NLOHMANN_DEFINE_TYPE_INTRUSIVE_ONLY_SERIALIZE","text":"
    #define NLOHMANN_DEFINE_TYPE_INTRUSIVE(type, member...)              // (1)\n#define NLOHMANN_DEFINE_TYPE_INTRUSIVE_WITH_DEFAULT(type, member...) // (2)\n#define NLOHMANN_DEFINE_TYPE_INTRUSIVE_ONLY_SERIALIZE(type, member...) // (3)\n

    These macros can be used to simplify the serialization/deserialization of types if you want to use a JSON object as serialization and want to use the member variable names as object keys in that object. The macro is to be defined inside the class/struct to create code for. Unlike NLOHMANN_DEFINE_TYPE_NON_INTRUSIVE, it can access private members. The first parameter is the name of the class/struct, and all remaining parameters name the members.

    1. Will use at during deserialization and will throw out_of_range.403 if a key is missing in the JSON object.
    2. Will use value during deserialization and fall back to the default value for the respective type of the member variable if a key in the JSON object is missing. The generated from_json() function default constructs an object and uses its values as the defaults when calling the value function.
    3. Only defines the serialization. Useful in cases when the type does not have a default constructor and only serialization is required.

    Summary:

    Need access to private members Need only de-serialization Allow missing values when de-serializing macro NLOHMANN_DEFINE_TYPE_INTRUSIVE NLOHMANN_DEFINE_TYPE_INTRUSIVE_WITH_DEFAULT NLOHMANN_DEFINE_TYPE_INTRUSIVE_ONLY_SERIALIZE"},{"location":"api/macros/nlohmann_define_type_intrusive/#parameters","title":"Parameters","text":"type (in) name of the type (class, struct) to serialize/deserialize member (in) name of the member variable to serialize/deserialize; up to 64 members can be given as a comma-separated list"},{"location":"api/macros/nlohmann_define_type_intrusive/#default-definition","title":"Default definition","text":"

    The macros add two friend functions to the class which take care of the serialization and deserialization:

    template<typename BasicJsonType>\nfriend void to_json(BasicJsonType&, const type&);\ntemplate<typename BasicJsonType>\nfriend void from_json(const BasicJsonType&, type&); // except (3)\n

    See the examples below for the concrete generated code.

    "},{"location":"api/macros/nlohmann_define_type_intrusive/#notes","title":"Notes","text":"

    Prerequisites

    1. The type type must be default constructible (except (3)). See How can I use get() for non-default constructible/non-copyable types? for how to overcome this limitation.
    2. The macro must be used inside the type (class/struct).

    Implementation limits

    • The current implementation is limited to at most 64 member variables. If you want to serialize/deserialize types with more than 64 member variables, you need to define the to_json/from_json functions manually.
    "},{"location":"api/macros/nlohmann_define_type_intrusive/#examples","title":"Examples","text":"Example (1): NLOHMANN_DEFINE_TYPE_INTRUSIVE

    Consider the following complete example:

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\nusing namespace nlohmann::literals;\n\nnamespace ns\n{\nclass person\n{\n  private:\n    std::string name = \"John Doe\";\n    std::string address = \"123 Fake St\";\n    int age = -1;\n\n  public:\n    person() = default;\n    person(std::string name_, std::string address_, int age_)\n        : name(std::move(name_)), address(std::move(address_)), age(age_)\n    {}\n\n    NLOHMANN_DEFINE_TYPE_INTRUSIVE(person, name, address, age)\n};\n} // namespace ns\n\nint main()\n{\n    ns::person p = {\"Ned Flanders\", \"744 Evergreen Terrace\", 60};\n\n    // serialization: person -> json\n    json j = p;\n    std::cout << \"serialization: \" << j << std::endl;\n\n    // deserialization: json -> person\n    json j2 = R\"({\"address\": \"742 Evergreen Terrace\", \"age\": 40, \"name\": \"Homer Simpson\"})\"_json;\n    auto p2 = j2.template get<ns::person>();\n\n    // incomplete deserialization:\n    json j3 = R\"({\"address\": \"742 Evergreen Terrace\", \"name\": \"Maggie Simpson\"})\"_json;\n    try\n    {\n        auto p3 = j3.template get<ns::person>();\n    }\n    catch (const json::exception& e)\n    {\n        std::cout << \"deserialization failed: \" << e.what() << std::endl;\n    }\n}\n

    Output:

    serialization: {\"address\":\"744 Evergreen Terrace\",\"age\":60,\"name\":\"Ned Flanders\"}\ndeserialization failed: [json.exception.out_of_range.403] key 'age' not found\n

    Notes:

    • ns::person is default-constructible. This is a requirement for using the macro.
    • ns::person has private member variables. This makes NLOHMANN_DEFINE_TYPE_INTRUSIVE applicable, but not NLOHMANN_DEFINE_TYPE_NON_INTRUSIVE.
    • The macro NLOHMANN_DEFINE_TYPE_INTRUSIVE is used inside the class.
    • A missing key \"age\" in the deserialization yields an exception. To fall back to the default value, NLOHMANN_DEFINE_TYPE_INTRUSIVE_WITH_DEFAULT can be used.

    The macro is equivalent to:

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\nusing namespace nlohmann::literals;\n\nnamespace ns\n{\nclass person\n{\n  private:\n    std::string name = \"John Doe\";\n    std::string address = \"123 Fake St\";\n    int age = -1;\n\n  public:\n    person() = default;\n    person(std::string name_, std::string address_, int age_)\n        : name(std::move(name_)), address(std::move(address_)), age(age_)\n    {}\n\n    template<typename BasicJsonType>\n    friend void to_json(BasicJsonType& nlohmann_json_j, const person& nlohmann_json_t)\n    {\n        nlohmann_json_j[\"name\"] = nlohmann_json_t.name;\n        nlohmann_json_j[\"address\"] = nlohmann_json_t.address;\n        nlohmann_json_j[\"age\"] = nlohmann_json_t.age;\n    }\n\n    template<typename BasicJsonType>\n    friend void from_json(const BasicJsonType& nlohmann_json_j, person& nlohmann_json_t)\n    {\n        nlohmann_json_t.name = nlohmann_json_j.at(\"name\");\n        nlohmann_json_t.address = nlohmann_json_j.at(\"address\");\n        nlohmann_json_t.age = nlohmann_json_j.at(\"age\");\n    }\n};\n} // namespace ns\n\nint main()\n{\n    ns::person p = {\"Ned Flanders\", \"744 Evergreen Terrace\", 60};\n\n    // serialization: person -> json\n    json j = p;\n    std::cout << \"serialization: \" << j << std::endl;\n\n    // deserialization: json -> person\n    json j2 = R\"({\"address\": \"742 Evergreen Terrace\", \"age\": 40, \"name\": \"Homer Simpson\"})\"_json;\n    auto p2 = j2.template get<ns::person>();\n\n    // incomplete deserialization:\n    json j3 = R\"({\"address\": \"742 Evergreen Terrace\", \"name\": \"Maggie Simpson\"})\"_json;\n    try\n    {\n        auto p3 = j3.template get<ns::person>();\n    }\n    catch (const json::exception& e)\n    {\n        std::cout << \"deserialization failed: \" << e.what() << std::endl;\n    }\n}\n
    Example (2): NLOHMANN_DEFINE_TYPE_INTRUSIVE_WITH_DEFAULT

    Consider the following complete example:

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\nusing namespace nlohmann::literals;\n\nnamespace ns\n{\nclass person\n{\n  private:\n    std::string name = \"John Doe\";\n    std::string address = \"123 Fake St\";\n    int age = -1;\n\n  public:\n    person() = default;\n    person(std::string name_, std::string address_, int age_)\n        : name(std::move(name_)), address(std::move(address_)), age(age_)\n    {}\n\n    NLOHMANN_DEFINE_TYPE_INTRUSIVE_WITH_DEFAULT(person, name, address, age)\n};\n} // namespace ns\n\nint main()\n{\n    ns::person p = {\"Ned Flanders\", \"744 Evergreen Terrace\", 60};\n\n    // serialization: person -> json\n    json j = p;\n    std::cout << \"serialization: \" << j << std::endl;\n\n    // deserialization: json -> person\n    json j2 = R\"({\"address\": \"742 Evergreen Terrace\", \"age\": 40, \"name\": \"Homer Simpson\"})\"_json;\n    auto p2 = j2.template get<ns::person>();\n\n    // incomplete deserialization:\n    json j3 = R\"({\"address\": \"742 Evergreen Terrace\", \"name\": \"Maggie Simpson\"})\"_json;\n    auto p3 = j3.template get<ns::person>();\n    std::cout << \"roundtrip: \" << json(p3) << std::endl;\n}\n

    Output:

    serialization: {\"address\":\"744 Evergreen Terrace\",\"age\":60,\"name\":\"Ned Flanders\"}\nroundtrip: {\"address\":\"742 Evergreen Terrace\",\"age\":-1,\"name\":\"Maggie Simpson\"}\n

    Notes:

    • ns::person is default-constructible. This is a requirement for using the macro.
    • ns::person has private member variables. This makes NLOHMANN_DEFINE_TYPE_INTRUSIVE_WITH_DEFAULT applicable, but not NLOHMANN_DEFINE_TYPE_NON_INTRUSIVE_WITH_DEFAULT.
    • The macro NLOHMANN_DEFINE_TYPE_INTRUSIVE_WITH_DEFAULT is used inside the class.
    • A missing key \"age\" in the deserialization does not yield an exception. Instead, the default value -1 is used.

    The macro is equivalent to:

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\nusing namespace nlohmann::literals;\n\nnamespace ns\n{\nclass person\n{\n  private:\n    std::string name = \"John Doe\";\n    std::string address = \"123 Fake St\";\n    int age = -1;\n\n  public:\n    person() = default;\n    person(std::string name_, std::string address_, int age_)\n        : name(std::move(name_)), address(std::move(address_)), age(age_)\n    {}\n\n    template<typename BasicJsonType>\n    friend void to_json(BasicJsonType& nlohmann_json_j, const person& nlohmann_json_t)\n    {\n        nlohmann_json_j[\"name\"] = nlohmann_json_t.name;\n        nlohmann_json_j[\"address\"] = nlohmann_json_t.address;\n        nlohmann_json_j[\"age\"] = nlohmann_json_t.age;\n    }\n\n    template<typename BasicJsonType>\n    friend void from_json(const BasicJsonType& nlohmann_json_j, person& nlohmann_json_t)\n    {\n        person nlohmann_json_default_obj;\n        nlohmann_json_t.name = nlohmann_json_j.value(\"name\", nlohmann_json_default_obj.name);\n        nlohmann_json_t.address = nlohmann_json_j.value(\"address\", nlohmann_json_default_obj.address);\n        nlohmann_json_t.age = nlohmann_json_j.value(\"age\", nlohmann_json_default_obj.age);\n    }\n};\n} // namespace ns\n\nint main()\n{\n    ns::person p = {\"Ned Flanders\", \"744 Evergreen Terrace\", 60};\n\n    // serialization: person -> json\n    json j = p;\n    std::cout << \"serialization: \" << j << std::endl;\n\n    // deserialization: json -> person\n    json j2 = R\"({\"address\": \"742 Evergreen Terrace\", \"age\": 40, \"name\": \"Homer Simpson\"})\"_json;\n    auto p2 = j2.template get<ns::person>();\n\n    // incomplete deserialization:\n    json j3 = R\"({\"address\": \"742 Evergreen Terrace\", \"name\": \"Maggie Simpson\"})\"_json;\n    auto p3 = j3.template get<ns::person>();\n    std::cout << \"roundtrip: \" << json(p3) << std::endl;\n}\n

    Note how a default-initialized person object is used in the from_json to fill missing values.

    Example (3): NLOHMANN_DEFINE_TYPE_INTRUSIVE_ONLY_SERIALIZE

    Consider the following complete example:

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\nusing namespace nlohmann::literals;\n\nnamespace ns\n{\nclass person\n{\n  private:\n    std::string name = \"John Doe\";\n    std::string address = \"123 Fake St\";\n    int age = -1;\n\n  public:\n    // No default constructor\n    person(std::string name_, std::string address_, int age_)\n        : name(std::move(name_)), address(std::move(address_)), age(age_)\n    {}\n\n    NLOHMANN_DEFINE_TYPE_INTRUSIVE(person, name, address, age)\n};\n} // namespace ns\n\nint main()\n{\n    ns::person p = {\"Ned Flanders\", \"744 Evergreen Terrace\", 60};\n\n    // serialization: person -> json\n    json j = p;\n    std::cout << \"serialization: \" << j << std::endl;\n}\n

    Output:

    serialization: {\"address\":\"744 Evergreen Terrace\",\"age\":60,\"name\":\"Ned Flanders\"}\n

    Notes:

    • ns::person is non-default-constructible. This allows this macro to be used instead of NLOHMANN_DEFINE_TYPE_INTRUSIVE and NLOHMANN_DEFINE_TYPE_INTRUSIVE_WITH_DEFAULT.
    • ns::person has private member variables. This makes NLOHMANN_DEFINE_TYPE_INTRUSIVE_ONLY_SERIALIZE applicable, but not NLOHMANN_DEFINE_TYPE_NON_INTRUSIVE_ONLY_SERIALIZE.
    • The macro NLOHMANN_DEFINE_TYPE_INTRUSIVE_ONLY_SERIALIZE is used inside the class.

    The macro is equivalent to:

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\nusing namespace nlohmann::literals;\n\nnamespace ns\n{\nclass person\n{\n  private:\n    std::string name = \"John Doe\";\n    std::string address = \"123 Fake St\";\n    int age = -1;\n\n  public:\n    // No default constructor\n    person(std::string name_, std::string address_, int age_)\n        : name(std::move(name_)), address(std::move(address_)), age(age_)\n    {}\n\n    template<typename BasicJsonType>\n    friend void to_json(BasicJsonType& nlohmann_json_j, const person& nlohmann_json_t)\n    {\n        nlohmann_json_j[\"name\"] = nlohmann_json_t.name;\n        nlohmann_json_j[\"address\"] = nlohmann_json_t.address;\n        nlohmann_json_j[\"age\"] = nlohmann_json_t.age;\n    }\n};\n} // namespace ns\n\nint main()\n{\n    ns::person p = {\"Ned Flanders\", \"744 Evergreen Terrace\", 60};\n\n    // serialization: person -> json\n    json j = p;\n    std::cout << \"serialization: \" << j << std::endl;\n}\n
    "},{"location":"api/macros/nlohmann_define_type_intrusive/#see-also","title":"See also","text":"
    • NLOHMANN_DEFINE_TYPE_NON_INTRUSIVE, NLOHMANN_DEFINE_TYPE_NON_INTRUSIVE_WITH_DEFAULT, NLOHMANN_DEFINE_TYPE_NON_INTRUSIVE_ONLY_SERIALIZE for a similar macro that can be defined outside the type.
    • NLOHMANN_DEFINE_DERIVED_TYPE_INTRUSIVE, NLOHMANN_DEFINE_DERIVED_TYPE_INTRUSIVE_WITH_DEFAULT, NLOHMANN_DEFINE_DERIVED_TYPE_INTRUSIVE_ONLY_SERIALIZE, NLOHMANN_DEFINE_DERIVED_TYPE_NON_INTRUSIVE, NLOHMANN_DEFINE_DERIVED_TYPE_NON_INTRUSIVE_WITH_DEFAULT, NLOHMANN_DEFINE_DERIVED_TYPE_NON_INTRUSIVE_ONLY_SERIALIZE for similar macros for derived types
    • Arbitrary Type Conversions for an overview.
    "},{"location":"api/macros/nlohmann_define_type_intrusive/#version-history","title":"Version history","text":"
    1. Added in version 3.9.0.
    2. Added in version 3.11.0.
    3. Added in version 3.11.3.
    "},{"location":"api/macros/nlohmann_define_type_non_intrusive/","title":"NLOHMANN_DEFINE_TYPE_NON_INTRUSIVE, NLOHMANN_DEFINE_TYPE_NON_INTRUSIVE_WITH_DEFAULT, NLOHMANN_DEFINE_TYPE_NON_INTRUSIVE_ONLY_SERIALIZE","text":"
    #define NLOHMANN_DEFINE_TYPE_NON_INTRUSIVE(type, member...)              // (1)\n#define NLOHMANN_DEFINE_TYPE_NON_INTRUSIVE_WITH_DEFAULT(type, member...) // (2)\n#define NLOHMANN_DEFINE_TYPE_NON_INTRUSIVE_ONLY_SERIALIZE(type, member...) // (3)\n

    These macros can be used to simplify the serialization/deserialization of types if you want to use a JSON object as serialization and want to use the member variable names as object keys in that object. The macro is to be defined outside the class/struct to create code for, but inside its namespace. Unlike NLOHMANN_DEFINE_TYPE_INTRUSIVE, it cannot access private members. The first parameter is the name of the class/struct, and all remaining parameters name the members.

    1. Will use at during deserialization and will throw out_of_range.403 if a key is missing in the JSON object.
    2. Will use value during deserialization and fall back to the default value for the respective type of the member variable if a key in the JSON object is missing. The generated from_json() function default constructs an object and uses its values as the defaults when calling the value function.
    3. Only defines the serialization. Useful in cases when the type does not have a default constructor and only serialization is required.

    Summary:

    Need access to private members Need only de-serialization Allow missing values when de-serializing macro NLOHMANN_DEFINE_TYPE_NON_INTRUSIVE NLOHMANN_DEFINE_TYPE_NON_INTRUSIVE_WITH_DEFAULT NLOHMANN_DEFINE_TYPE_NON_INTRUSIVE_ONLY_SERIALIZE"},{"location":"api/macros/nlohmann_define_type_non_intrusive/#parameters","title":"Parameters","text":"type (in) name of the type (class, struct) to serialize/deserialize member (in) name of the (public) member variable to serialize/deserialize; up to 64 members can be given as a comma-separated list"},{"location":"api/macros/nlohmann_define_type_non_intrusive/#default-definition","title":"Default definition","text":"

    The macros add two functions to the namespace which take care of the serialization and deserialization:

    template<typename BasicJsonType>\nvoid to_json(BasicJsonType&, const type&);\ntemplate<typename BasicJsonType>\nvoid from_json(const BasicJsonType&, type&); // except (3)\n

    See the examples below for the concrete generated code.

    "},{"location":"api/macros/nlohmann_define_type_non_intrusive/#notes","title":"Notes","text":"

    Prerequisites

    1. The type type must be default constructible (except (3). See How can I use get() for non-default constructible/non-copyable types? for how to overcome this limitation.
    2. The macro must be used outside the type (class/struct).
    3. The passed members must be public.

    Implementation limits

    • The current implementation is limited to at most 64 member variables. If you want to serialize/deserialize types with more than 64 member variables, you need to define the to_json/from_json functions manually.
    "},{"location":"api/macros/nlohmann_define_type_non_intrusive/#examples","title":"Examples","text":"Example (1): NLOHMANN_DEFINE_TYPE_NON_INTRUSIVE

    Consider the following complete example:

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\nusing namespace nlohmann::literals;\n\nnamespace ns\n{\nstruct person\n{\n    std::string name;\n    std::string address;\n    int age;\n};\n\nNLOHMANN_DEFINE_TYPE_NON_INTRUSIVE(person, name, address, age)\n} // namespace ns\n\nint main()\n{\n    ns::person p = {\"Ned Flanders\", \"744 Evergreen Terrace\", 60};\n\n    // serialization: person -> json\n    json j = p;\n    std::cout << \"serialization: \" << j << std::endl;\n\n    // deserialization: json -> person\n    json j2 = R\"({\"address\": \"742 Evergreen Terrace\", \"age\": 40, \"name\": \"Homer Simpson\"})\"_json;\n    auto p2 = j2.template get<ns::person>();\n\n    // incomplete deserialization:\n    json j3 = R\"({\"address\": \"742 Evergreen Terrace\", \"name\": \"Maggie Simpson\"})\"_json;\n    try\n    {\n        auto p3 = j3.template get<ns::person>();\n    }\n    catch (const json::exception& e)\n    {\n        std::cout << \"deserialization failed: \" << e.what() << std::endl;\n    }\n}\n

    Output:

    serialization: {\"address\":\"744 Evergreen Terrace\",\"age\":60,\"name\":\"Ned Flanders\"}\ndeserialization failed: [json.exception.out_of_range.403] key 'age' not found\n

    Notes:

    • ns::person is default-constructible. This is a requirement for using the macro.
    • ns::person has only public member variables. This makes NLOHMANN_DEFINE_TYPE_NON_INTRUSIVE applicable.
    • The macro NLOHMANN_DEFINE_TYPE_NON_INTRUSIVE is used outside the class, but inside its namespace ns.
    • A missing key \"age\" in the deserialization yields an exception. To fall back to the default value, NLOHMANN_DEFINE_TYPE_NON_INTRUSIVE_WITH_DEFAULT can be used.

    The macro is equivalent to:

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\nusing namespace nlohmann::literals;\n\nnamespace ns\n{\nstruct person\n{\n    std::string name;\n    std::string address;\n    int age;\n};\n\ntemplate<typename BasicJsonType>\nvoid to_json(BasicJsonType& nlohmann_json_j, const person& nlohmann_json_t)\n{\n    nlohmann_json_j[\"name\"] = nlohmann_json_t.name;\n    nlohmann_json_j[\"address\"] = nlohmann_json_t.address;\n    nlohmann_json_j[\"age\"] = nlohmann_json_t.age;\n}\n\ntemplate<typename BasicJsonType>\nvoid from_json(const BasicJsonType& nlohmann_json_j, person& nlohmann_json_t)\n{\n    nlohmann_json_t.name = nlohmann_json_j.at(\"name\");\n    nlohmann_json_t.address = nlohmann_json_j.at(\"address\");\n    nlohmann_json_t.age = nlohmann_json_j.at(\"age\");\n}\n} // namespace ns\n\nint main()\n{\n    ns::person p = {\"Ned Flanders\", \"744 Evergreen Terrace\", 60};\n\n    // serialization: person -> json\n    json j = p;\n    std::cout << \"serialization: \" << j << std::endl;\n\n    // deserialization: json -> person\n    json j2 = R\"({\"address\": \"742 Evergreen Terrace\", \"age\": 40, \"name\": \"Homer Simpson\"})\"_json;\n    auto p2 = j2.template get<ns::person>();\n\n    // incomplete deserialization:\n    json j3 = R\"({\"address\": \"742 Evergreen Terrace\", \"name\": \"Maggie Simpson\"})\"_json;\n    try\n    {\n        auto p3 = j3.template get<ns::person>();\n    }\n    catch (const json::exception& e)\n    {\n        std::cout << \"deserialization failed: \" << e.what() << std::endl;\n    }\n}\n
    Example (2): NLOHMANN_DEFINE_TYPE_NON_INTRUSIVE_WITH_DEFAULT

    Consider the following complete example:

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\nusing namespace nlohmann::literals;\n\nnamespace ns\n{\nstruct person\n{\n    std::string name = \"John Doe\";\n    std::string address = \"123 Fake St\";\n    int age = -1;\n\n    person() = default;\n    person(std::string name_, std::string address_, int age_)\n        : name(std::move(name_)), address(std::move(address_)), age(age_)\n    {}\n};\n\nNLOHMANN_DEFINE_TYPE_NON_INTRUSIVE_WITH_DEFAULT(person, name, address, age)\n} // namespace ns\n\nint main()\n{\n    ns::person p = {\"Ned Flanders\", \"744 Evergreen Terrace\", 60};\n\n    // serialization: person -> json\n    json j = p;\n    std::cout << \"serialization: \" << j << std::endl;\n\n    // deserialization: json -> person\n    json j2 = R\"({\"address\": \"742 Evergreen Terrace\", \"age\": 40, \"name\": \"Homer Simpson\"})\"_json;\n    auto p2 = j2.template get<ns::person>();\n\n    // incomplete deserialization:\n    json j3 = R\"({\"address\": \"742 Evergreen Terrace\", \"name\": \"Maggie Simpson\"})\"_json;\n    auto p3 = j3.template get<ns::person>();\n    std::cout << \"roundtrip: \" << json(p3) << std::endl;\n}\n

    Output:

    serialization: {\"address\":\"744 Evergreen Terrace\",\"age\":60,\"name\":\"Ned Flanders\"}\nroundtrip: {\"address\":\"742 Evergreen Terrace\",\"age\":-1,\"name\":\"Maggie Simpson\"}\n

    Notes:

    • ns::person is default-constructible. This is a requirement for using the macro.
    • ns::person has only public member variables. This makes NLOHMANN_DEFINE_TYPE_NON_INTRUSIVE_WITH_DEFAULT applicable.
    • The macro NLOHMANN_DEFINE_TYPE_NON_INTRUSIVE_WITH_DEFAULT is used outside the class, but inside its namespace ns.
    • A missing key \"age\" in the deserialization does not yield an exception. Instead, the default value -1 is used.

    The macro is equivalent to:

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\nusing namespace nlohmann::literals;\n\nnamespace ns\n{\nstruct person\n{\n    std::string name = \"John Doe\";\n    std::string address = \"123 Fake St\";\n    int age = -1;\n\n    person() = default;\n    person(std::string name_, std::string address_, int age_)\n        : name(std::move(name_)), address(std::move(address_)), age(age_)\n    {}\n};\n\ntemplate<typename BasicJsonType>\nvoid to_json(BasicJsonType& nlohmann_json_j, const person& nlohmann_json_t)\n{\n    nlohmann_json_j[\"name\"] = nlohmann_json_t.name;\n    nlohmann_json_j[\"address\"] = nlohmann_json_t.address;\n    nlohmann_json_j[\"age\"] = nlohmann_json_t.age;\n}\n\ntemplate<typename BasicJsonType>\nvoid from_json(const BasicJsonType& nlohmann_json_j, person& nlohmann_json_t)\n{\n    person nlohmann_json_default_obj;\n    nlohmann_json_t.name = nlohmann_json_j.value(\"name\", nlohmann_json_default_obj.name);\n    nlohmann_json_t.address = nlohmann_json_j.value(\"address\", nlohmann_json_default_obj.address);\n    nlohmann_json_t.age = nlohmann_json_j.value(\"age\", nlohmann_json_default_obj.age);\n}\n} // namespace ns\n\nint main()\n{\n    ns::person p = {\"Ned Flanders\", \"744 Evergreen Terrace\", 60};\n\n    // serialization: person -> json\n    json j = p;\n    std::cout << \"serialization: \" << j << std::endl;\n\n    // deserialization: json -> person\n    json j2 = R\"({\"address\": \"742 Evergreen Terrace\", \"age\": 40, \"name\": \"Homer Simpson\"})\"_json;\n    auto p2 = j2.template get<ns::person>();\n\n    // incomplete deserialization:\n    json j3 = R\"({\"address\": \"742 Evergreen Terrace\", \"name\": \"Maggie Simpson\"})\"_json;\n    auto p3 = j3.template get<ns::person>();\n    std::cout << \"roundtrip: \" << json(p3) << std::endl;\n}\n

    Note how a default-initialized person object is used in the from_json to fill missing values.

    Example (3): NLOHMANN_DEFINE_TYPE_NON_INTRUSIVE_ONLY_SERIALIZE

    Consider the following complete example:

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\nusing namespace nlohmann::literals;\n\nnamespace ns\n{\nstruct person\n{\n    std::string name;\n    std::string address;\n    int age;\n};\n\nNLOHMANN_DEFINE_TYPE_NON_INTRUSIVE_ONLY_SERIALIZE(person, name, address, age)\n} // namespace ns\n\nint main()\n{\n    ns::person p = {\"Ned Flanders\", \"744 Evergreen Terrace\", 60};\n\n    // serialization: person -> json\n    json j = p;\n    std::cout << \"serialization: \" << j << std::endl;\n}\n

    Output:

    serialization: {\"address\":\"744 Evergreen Terrace\",\"age\":60,\"name\":\"Ned Flanders\"}\n

    Notes:

    • ns::person is non-default-constructible. This allows this macro to be used instead of NLOHMANN_DEFINE_TYPE_NON_INTRUSIVE and NLOHMANN_DEFINE_TYPE_NON_INTRUSIVE_WITH_DEFAULT.
    • ns::person has only public member variables. This makes NLOHMANN_DEFINE_TYPE_NON_INTRUSIVE_ONLY_SERIALIZE applicable.
    • The macro NLOHMANN_DEFINE_TYPE_NON_INTRUSIVE_ONLY_SERIALIZE is used outside the class, but inside its namespace ns.

    The macro is equivalent to:

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\nusing namespace nlohmann::literals;\n\nnamespace ns\n{\nstruct person\n{\n    std::string name;\n    std::string address;\n    int age;\n};\n\ntemplate<typename BasicJsonType>\nvoid to_json(BasicJsonType& nlohmann_json_j, const person& nlohmann_json_t)\n{\n    nlohmann_json_j[\"name\"] = nlohmann_json_t.name;\n    nlohmann_json_j[\"address\"] = nlohmann_json_t.address;\n    nlohmann_json_j[\"age\"] = nlohmann_json_t.age;\n}\n} // namespace ns\n\nint main()\n{\n    ns::person p = {\"Ned Flanders\", \"744 Evergreen Terrace\", 60};\n\n    // serialization: person -> json\n    json j = p;\n    std::cout << \"serialization: \" << j << std::endl;\n}\n
    "},{"location":"api/macros/nlohmann_define_type_non_intrusive/#see-also","title":"See also","text":"
    • NLOHMANN_DEFINE_TYPE_INTRUSIVE, NLOHMANN_DEFINE_TYPE_INTRUSIVE_WITH_DEFAULT, NLOHMANN_DEFINE_TYPE_INTRUSIVE_ONLY_SERIALIZE for a similar macro that can be defined inside the type.
    • NLOHMANN_DEFINE_DERIVED_TYPE_INTRUSIVE, NLOHMANN_DEFINE_DERIVED_TYPE_INTRUSIVE_WITH_DEFAULT, NLOHMANN_DEFINE_DERIVED_TYPE_INTRUSIVE_ONLY_SERIALIZE, NLOHMANN_DEFINE_DERIVED_TYPE_NON_INTRUSIVE, NLOHMANN_DEFINE_DERIVED_TYPE_NON_INTRUSIVE_WITH_DEFAULT, NLOHMANN_DEFINE_DERIVED_TYPE_NON_INTRUSIVE_ONLY_SERIALIZE for similar macros for derived types
    • Arbitrary Type Conversions for an overview.
    "},{"location":"api/macros/nlohmann_define_type_non_intrusive/#version-history","title":"Version history","text":"
    1. Added in version 3.9.0.
    2. Added in version 3.11.0.
    3. Added in version 3.11.3.
    "},{"location":"api/macros/nlohmann_json_namespace/","title":"NLOHMANN_JSON_NAMESPACE","text":"
    #define NLOHMANN_JSON_NAMESPACE /* value */\n

    This macro evaluates to the full name of the nlohmann namespace.

    "},{"location":"api/macros/nlohmann_json_namespace/#default-definition","title":"Default definition","text":"

    The default value consists of the root namespace (nlohmann) and an inline ABI namespace. See nlohmann Namespace for details.

    When the macro is not defined, the library will define it to its default value. Overriding this value has no effect on the library.

    "},{"location":"api/macros/nlohmann_json_namespace/#examples","title":"Examples","text":"Example

    The example shows how to use NLOHMANN_JSON_NAMESPACE instead of just nlohmann, as well as how to output the value of NLOHMANN_JSON_NAMESPACE.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\n// possible use case: use NLOHMANN_JSON_NAMESPACE instead of nlohmann\nusing json = NLOHMANN_JSON_NAMESPACE::json;\n\n// macro needed to output the NLOHMANN_JSON_NAMESPACE as string literal\n#define Q(x) #x\n#define QUOTE(x) Q(x)\n\nint main()\n{\n    std::cout << QUOTE(NLOHMANN_JSON_NAMESPACE) << std::endl;\n}\n

    Output:

    nlohmann::json_abi_v3_12_0\n
    "},{"location":"api/macros/nlohmann_json_namespace/#see-also","title":"See also","text":"
    • NLOHMANN_JSON_NAMESPACE_BEGIN, NLOHMANN_JSON_NAMESPACE_END
    • NLOHMANN_JSON_NAMESPACE_NO_VERSION
    "},{"location":"api/macros/nlohmann_json_namespace/#version-history","title":"Version history","text":"
    • Added in version 3.11.0. Changed inline namespace name in version 3.11.2.
    "},{"location":"api/macros/nlohmann_json_namespace_begin/","title":"NLOHMANN_JSON_NAMESPACE_BEGIN, NLOHMANN_JSON_NAMESPACE_END","text":"
    #define NLOHMANN_JSON_NAMESPACE_BEGIN /* value */  // (1)\n#define NLOHMANN_JSON_NAMESPACE_END   /* value */  // (2)\n

    These macros can be used to open and close the nlohmann namespace. See nlohmann Namespace for details.

    1. Opens the namespace.
    2. Closes the namespace.
    "},{"location":"api/macros/nlohmann_json_namespace_begin/#default-definition","title":"Default definition","text":"

    The default definitions open and close the nlohmann namespace. The precise definition of [NLOHMANN_JSON_NAMESPACE_BEGIN] varies as described here.

    1. Default definition of NLOHMANN_JSON_NAMESPACE_BEGIN:

      namespace nlohmann\n{\ninline namespace json_abi_v3_11_2\n{\n

    2. Default definition of NLOHMANN_JSON_NAMESPACE_END: 

      }  // namespace json_abi_v3_11_2\n}  // namespace nlohmann\n

    When these macros are not defined, the library will define them to their default definitions.

    "},{"location":"api/macros/nlohmann_json_namespace_begin/#examples","title":"Examples","text":"Example

    The example shows how to use NLOHMANN_JSON_NAMESPACE_BEGIN/NLOHMANN_JSON_NAMESPACE_END from the How do I convert third-party types? page.

    #include <iostream>\n#include <optional>\n#include <nlohmann/json.hpp>\n\n// partial specialization (see https://json.nlohmann.me/features/arbitrary_types/)\nNLOHMANN_JSON_NAMESPACE_BEGIN\ntemplate <typename T>\nstruct adl_serializer<std::optional<T>>\n{\n    static void to_json(json& j, const std::optional<T>& opt)\n    {\n        if (opt == std::nullopt)\n        {\n            j = nullptr;\n        }\n        else\n        {\n            j = *opt;\n        }\n    }\n};\nNLOHMANN_JSON_NAMESPACE_END\n\nint main()\n{\n    std::optional<int> o1 = 1;\n    std::optional<int> o2 = std::nullopt;\n\n    NLOHMANN_JSON_NAMESPACE::json j;\n    j.push_back(o1);\n    j.push_back(o2);\n    std::cout << j << std::endl;\n}\n

    Output:

    [1,null]\n
    "},{"location":"api/macros/nlohmann_json_namespace_begin/#see-also","title":"See also","text":"
    • nlohmann Namespace
    • NLOHMANN_JSON_NAMESPACE
    • NLOHMANN_JSON_NAMESPACE_NO_VERSION
    "},{"location":"api/macros/nlohmann_json_namespace_begin/#version-history","title":"Version history","text":"
    • Added in version 3.11.0. Changed inline namespace name in version 3.11.2.
    "},{"location":"api/macros/nlohmann_json_namespace_no_version/","title":"NLOHMANN_JSON_NAMESPACE_NO_VERSION","text":"
    #define NLOHMANN_JSON_NAMESPACE_NO_VERSION /* value */\n

    If defined to 1, the version component is omitted from the inline namespace. See nlohmann Namespace for details.

    "},{"location":"api/macros/nlohmann_json_namespace_no_version/#default-definition","title":"Default definition","text":"

    The default value is 0.

    #define NLOHMANN_JSON_NAMESPACE_NO_VERSION 0\n

    When the macro is not defined, the library will define it to its default value.

    "},{"location":"api/macros/nlohmann_json_namespace_no_version/#examples","title":"Examples","text":"Example

    The example shows how to use NLOHMANN_JSON_NAMESPACE_NO_VERSION to disable the version component of the inline namespace.

    #include <iostream>\n\n#define NLOHMANN_JSON_NAMESPACE_NO_VERSION 1\n#include <nlohmann/json.hpp>\n\n// macro needed to output the NLOHMANN_JSON_NAMESPACE as string literal\n#define Q(x) #x\n#define QUOTE(x) Q(x)\n\nint main()\n{\n    std::cout << QUOTE(NLOHMANN_JSON_NAMESPACE) << std::endl;\n}\n

    Output:

    nlohmann::json_abi\n
    "},{"location":"api/macros/nlohmann_json_namespace_no_version/#see-also","title":"See also","text":"
    • nlohmann Namespace
    • NLOHMANN_JSON_NAMESPACE
    • NLOHMANN_JSON_NAMESPACE_BEGIN, NLOHMANN_JSON_NAMESPACE_END
    "},{"location":"api/macros/nlohmann_json_namespace_no_version/#version-history","title":"Version history","text":"
    • Added in version 3.11.2.
    "},{"location":"api/macros/nlohmann_json_serialize_enum/","title":"NLOHMANN_JSON_SERIALIZE_ENUM","text":"
    #define NLOHMANN_JSON_SERIALIZE_ENUM(type, conversion...)\n

    By default, enum values are serialized to JSON as integers. In some cases, this could result in undesired behavior. If an enum is modified or re-ordered after data has been serialized to JSON, the later deserialized JSON data may be undefined or a different enum value than was originally intended.

    The NLOHMANN_JSON_SERIALIZE_ENUM allows to define a user-defined serialization for every enumerator.

    "},{"location":"api/macros/nlohmann_json_serialize_enum/#parameters","title":"Parameters","text":"type (in) name of the enum to serialize/deserialize conversion (in) a pair of an enumerator and a JSON serialization; arbitrary pairs can be given as a comma-separated list"},{"location":"api/macros/nlohmann_json_serialize_enum/#default-definition","title":"Default definition","text":"

    The macro adds two functions to the namespace which take care of the serialization and deserialization:

    template<typename BasicJsonType>\ninline void to_json(BasicJsonType& j, const type& e);\ntemplate<typename BasicJsonType>\ninline void from_json(const BasicJsonType& j, type& e);\n
    "},{"location":"api/macros/nlohmann_json_serialize_enum/#notes","title":"Notes","text":"

    Prerequisites

    The macro must be used inside the namespace of the enum.

    Important notes

    • When using template get<ENUM_TYPE>(), undefined JSON values will default to the first specified conversion. Select this default pair carefully. See example 1 below.
    • If an enum or JSON value is specified in multiple conversions, the first matching conversion from the top of the list will be returned when converting to or from JSON. See example 2 below.
    "},{"location":"api/macros/nlohmann_json_serialize_enum/#examples","title":"Examples","text":"Example 1: Basic usage

    The example shows how NLOHMANN_JSON_SERIALIZE_ENUM can be used to serialize/deserialize both classical enums and C++11 enum classes:

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nnamespace ns\n{\nenum TaskState\n{\n    TS_STOPPED,\n    TS_RUNNING,\n    TS_COMPLETED,\n    TS_INVALID = -1\n};\n\nNLOHMANN_JSON_SERIALIZE_ENUM(TaskState,\n{\n    { TS_INVALID, nullptr },\n    { TS_STOPPED, \"stopped\" },\n    { TS_RUNNING, \"running\" },\n    { TS_COMPLETED, \"completed\" }\n})\n\nenum class Color\n{\n    red, green, blue, unknown\n};\n\nNLOHMANN_JSON_SERIALIZE_ENUM(Color,\n{\n    { Color::unknown, \"unknown\" }, { Color::red, \"red\" },\n    { Color::green, \"green\" }, { Color::blue, \"blue\" }\n})\n} // namespace ns\n\nint main()\n{\n    // serialization\n    json j_stopped = ns::TS_STOPPED;\n    json j_red = ns::Color::red;\n    std::cout << \"ns::TS_STOPPED -> \" << j_stopped\n              << \", ns::Color::red -> \" << j_red << std::endl;\n\n    // deserialization\n    json j_running = \"running\";\n    json j_blue = \"blue\";\n    auto running = j_running.template get<ns::TaskState>();\n    auto blue = j_blue.template get<ns::Color>();\n    std::cout << j_running << \" -> \" << running\n              << \", \" << j_blue << \" -> \" << static_cast<int>(blue) << std::endl;\n\n    // deserializing undefined JSON value to enum\n    // (where the first map entry above is the default)\n    json j_pi = 3.14;\n    auto invalid = j_pi.template get<ns::TaskState>();\n    auto unknown = j_pi.template get<ns::Color>();\n    std::cout << j_pi << \" -> \" << invalid << \", \"\n              << j_pi << \" -> \" << static_cast<int>(unknown) << std::endl;\n}\n

    Output:

    ns::TS_STOPPED -> \"stopped\", ns::Color::red -> \"red\"\n\"running\" -> 1, \"blue\" -> 2\n3.14 -> -1, 3.14 -> 3\n
    Example 2: Multiple conversions for one enumerator

    The example shows how to use multiple conversions for a single enumerator. In the example, Color::red will always be serialized to \"red\", because the first occurring conversion. The second conversion, however, offers an alternative deserialization from \"rot\" to Color::red.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nnamespace ns\n{\nenum class Color\n{\n    red, green, blue, unknown\n};\n\nNLOHMANN_JSON_SERIALIZE_ENUM(Color,\n{\n    { Color::unknown, \"unknown\" }, { Color::red, \"red\" },\n    { Color::green, \"green\" }, { Color::blue, \"blue\" },\n    { Color::red, \"rot\" } // a second conversion for Color::red\n})\n}\n\nint main()\n{\n    // serialization\n    json j_red = ns::Color::red;\n    std::cout << static_cast<int>(ns::Color::red) << \" -> \" << j_red << std::endl;\n\n    // deserialization\n    json j_rot = \"rot\";\n    auto rot = j_rot.template get<ns::Color>();\n    auto red = j_red.template get<ns::Color>();\n    std::cout << j_rot << \" -> \" << static_cast<int>(rot) << std::endl;\n    std::cout << j_red << \" -> \" << static_cast<int>(red) << std::endl;\n}\n

    Output:

    0 -> \"red\"\n\"rot\" -> 0\n\"red\" -> 0\n
    "},{"location":"api/macros/nlohmann_json_serialize_enum/#see-also","title":"See also","text":"
    • Specializing enum conversion
    • JSON_DISABLE_ENUM_SERIALIZATION
    "},{"location":"api/macros/nlohmann_json_serialize_enum/#version-history","title":"Version history","text":"

    Added in version 3.4.0.

    "},{"location":"api/macros/nlohmann_json_version_major/","title":"NLOHMANN_JSON_VERSION_MAJOR, NLOHMANN_JSON_VERSION_MINOR, NLOHMANN_JSON_VERSION_PATCH","text":"
    #define NLOHMANN_JSON_VERSION_MAJOR /* value */\n#define NLOHMANN_JSON_VERSION_MINOR /* value */\n#define NLOHMANN_JSON_VERSION_PATCH /* value */\n

    These macros are defined by the library and contain the version numbers according to Semantic Versioning 2.0.0.

    "},{"location":"api/macros/nlohmann_json_version_major/#default-definition","title":"Default definition","text":"

    The macros are defined according to the current library version.

    "},{"location":"api/macros/nlohmann_json_version_major/#examples","title":"Examples","text":"Example

    The example below shows how NLOHMANN_JSON_VERSION_MAJOR, NLOHMANN_JSON_VERSION_MINOR, and NLOHMANN_JSON_VERSION_PATCH are defined by the library.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    std::cout << \"JSON for Modern C++ version \"\n              << NLOHMANN_JSON_VERSION_MAJOR << \".\"\n              << NLOHMANN_JSON_VERSION_MINOR << \".\"\n              << NLOHMANN_JSON_VERSION_PATCH << std::endl;\n}\n

    Output:

    JSON for Modern C++ version 3.12.0\n
    "},{"location":"api/macros/nlohmann_json_version_major/#see-also","title":"See also","text":"
    • meta - returns version information on the library
    • JSON_SKIP_LIBRARY_VERSION_CHECK - skip library version check
    "},{"location":"api/macros/nlohmann_json_version_major/#version-history","title":"Version history","text":"
    • Added in version 3.1.0.
    "},{"location":"community/","title":"Community","text":"
    • Code of Conduct - the rules and norms of this project
    • Contribution Guidelines - guidelines how to contribute to this project
    • Governance - the governance model of this project
    • Quality Assurance - how the quality of this project is assured
    • Security Policy - the security policy of the project
    "},{"location":"community/code_of_conduct/","title":"Contributor Covenant Code of Conduct","text":""},{"location":"community/code_of_conduct/#our-pledge","title":"Our Pledge","text":"

    We as members, contributors, and leaders pledge to make participation in our community a harassment-free experience for everyone, regardless of age, body size, visible or invisible disability, ethnicity, sex characteristics, gender identity and expression, level of experience, education, socio-economic status, nationality, personal appearance, race, caste, color, religion, or sexual identity and orientation.

    We pledge to act and interact in ways that contribute to an open, welcoming, diverse, inclusive, and healthy community.

    "},{"location":"community/code_of_conduct/#our-standards","title":"Our Standards","text":"

    Examples of behavior that contributes to a positive environment for our community include:

    • Demonstrating empathy and kindness toward other people
    • Being respectful of differing opinions, viewpoints, and experiences
    • Giving and gracefully accepting constructive feedback
    • Accepting responsibility and apologizing to those affected by our mistakes, and learning from the experience
    • Focusing on what is best not just for us as individuals, but for the overall community

    Examples of unacceptable behavior include:

    • The use of sexualized language or imagery, and sexual attention or advances of any kind
    • Trolling, insulting or derogatory comments, and personal or political attacks
    • Public or private harassment
    • Publishing others' private information, such as a physical or email address, without their explicit permission
    • Other conduct which could reasonably be considered inappropriate in a professional setting
    "},{"location":"community/code_of_conduct/#enforcement-responsibilities","title":"Enforcement Responsibilities","text":"

    Community leaders are responsible for clarifying and enforcing our standards of acceptable behavior and will take appropriate and fair corrective action in response to any behavior that they deem inappropriate, threatening, offensive, or harmful.

    Community leaders have the right and responsibility to remove, edit, or reject comments, commits, code, wiki edits, issues, and other contributions that are not aligned to this Code of Conduct, and will communicate reasons for moderation decisions when appropriate.

    "},{"location":"community/code_of_conduct/#scope","title":"Scope","text":"

    This Code of Conduct applies within all community spaces, and also applies when an individual is officially representing the community in public spaces. Examples of representing our community include using an official email address, posting via an official social media account, or acting as an appointed representative at an online or offline event.

    "},{"location":"community/code_of_conduct/#enforcement","title":"Enforcement","text":"

    Instances of abusive, harassing, or otherwise unacceptable behavior may be reported to the community leaders responsible for enforcement at mail@nlohmann.me. All complaints will be reviewed and investigated promptly and fairly.

    All community leaders are obligated to respect the privacy and security of the reporter of any incident.

    "},{"location":"community/code_of_conduct/#enforcement-guidelines","title":"Enforcement Guidelines","text":"

    Community leaders will follow these Community Impact Guidelines in determining the consequences for any action they deem in violation of this Code of Conduct:

    "},{"location":"community/code_of_conduct/#1-correction","title":"1. Correction","text":"

    Community Impact: Use of inappropriate language or other behavior deemed unprofessional or unwelcome in the community.

    Consequence: A private, written warning from community leaders, providing clarity around the nature of the violation and an explanation of why the behavior was inappropriate. A public apology may be requested.

    "},{"location":"community/code_of_conduct/#2-warning","title":"2. Warning","text":"

    Community Impact: A violation through a single incident or series of actions.

    Consequence: A warning with consequences for continued behavior. No interaction with the people involved, including unsolicited interaction with those enforcing the Code of Conduct, for a specified period of time. This includes avoiding interactions in community spaces as well as external channels like social media. Violating these terms may lead to a temporary or permanent ban.

    "},{"location":"community/code_of_conduct/#3-temporary-ban","title":"3. Temporary Ban","text":"

    Community Impact: A serious violation of community standards, including sustained inappropriate behavior.

    Consequence: A temporary ban from any sort of interaction or public communication with the community for a specified period of time. No public or private interaction with the people involved, including unsolicited interaction with those enforcing the Code of Conduct, is allowed during this period. Violating these terms may lead to a permanent ban.

    "},{"location":"community/code_of_conduct/#4-permanent-ban","title":"4. Permanent Ban","text":"

    Community Impact: Demonstrating a pattern of violation of community standards, including sustained inappropriate behavior, harassment of an individual, or aggression toward or disparagement of classes of individuals.

    Consequence: A permanent ban from any sort of public interaction within the community.

    "},{"location":"community/code_of_conduct/#attribution","title":"Attribution","text":"

    This Code of Conduct is adapted from the Contributor Covenant, version 2.1, available at https://www.contributor-covenant.org/version/2/1/code_of_conduct.html.

    Community Impact Guidelines were inspired by Mozilla's code of conduct enforcement ladder.

    For answers to common questions about this code of conduct, see the FAQ at https://www.contributor-covenant.org/faq. Translations are available at https://www.contributor-covenant.org/translations.

    "},{"location":"community/contribution_guidelines/","title":"Contribution Guidelines","text":"

    Thank you for your interest in contributing to this project! What began as an exercise to explore the exciting features of C++11 has evolved into a widely used JSON library. I truly appreciate all the contributions from the community, whether it's proposing features, identifying bugs, or fixing mistakes! To ensure that our collaboration is efficient and effective, please follow these guidelines.

    Feel free to discuss or suggest improvements to this document by submitting a pull request.

    "},{"location":"community/contribution_guidelines/#ways-to-contribute","title":"Ways to Contribute","text":"

    There are multiple ways to contribute.

    "},{"location":"community/contribution_guidelines/#reporting-an-issue","title":"Reporting an issue","text":"

    Please create an issue, assuming one does not already exist, and describe your concern. Note you need a GitHub account for this.

    Clearly describe the issue:

    • If it is a bug, please describe how to reproduce it. If possible, attach a complete example which demonstrates the error. Please also state what you expected to happen instead of the error.
    • If you propose a change or addition, try to give an example what the improved code could look like or how to use it.
    • If you found a compilation error, please tell us which compiler (version and operating system) you used and paste the (relevant part of) the error messages to the ticket.

    Please stick to the provided issue template bug report if possible.

    "},{"location":"community/contribution_guidelines/#reporting-a-security-vulnerability","title":"Reporting a security vulnerability","text":"

    You can report a security vulnerability according to our security policy.

    "},{"location":"community/contribution_guidelines/#discussing-a-new-feature","title":"Discussing a new feature","text":"

    For questions, feature or support requests, please open a discussion. If you find a proposed answer satisfactory, please use the \"Mark as answer\" button to make it easier for readers to see what helped and for the community to filter for open questions.

    "},{"location":"community/contribution_guidelines/#proposing-a-fix-or-an-improvement","title":"Proposing a fix or an improvement","text":"

    Join an ongoing discussion or comment on an existing issue before starting to code. This can help to avoid duplicate efforts or other frustration during the later review.

    Create a pull request against the develop branch and follow the pull request template. In particular,

    • describe the changes in detail, both the what and why,
    • reference existing issues where applicable,
    • add tests to maintain 100% test coverage,
    • update the documentation as needed, and
    • ensure the source code is amalgamated.

    We describe all points in detail below.

    All contributions (including pull requests) must agree to the Developer Certificate of Origin (DCO) version 1.1. This is exactly the same one created and used by the Linux kernel developers and posted on http://developercertificate.org/. This is a developer's certification that he or she has the right to submit the patch for inclusion into the project.

    "},{"location":"community/contribution_guidelines/#how-to","title":"How to...","text":""},{"location":"community/contribution_guidelines/#describe-your-changes","title":"Describe your changes","text":"

    This library is primarily maintained as a spare-time project. As such, I cannot make any guarantee how quickly changes are merged and released. Therefore, it is very important to make the review as smooth as possible by explaining not only what you changed, but why. This rationale can be very valuable down the road when improvements or bugs are discussed years later.

    "},{"location":"community/contribution_guidelines/#reference-an-existing-issue","title":"Reference an existing issue","text":"

    Link a pull request to an issue to clarify that a fix is forthcoming and which issue can be closed after merging. Only a few cases (e.g., fixing typos) do not require prior discussions.

    "},{"location":"community/contribution_guidelines/#write-tests","title":"Write tests","text":"

    The library has an extensive test suite that currently covers 100 % of the library's code. These tests are crucial to maintain API stability and give future contributors confidence that they do not accidentally break things. As Titus Winters aptly put it:

    If you liked it, you should have put a test on it.

    "},{"location":"community/contribution_guidelines/#run-the-tests","title":"Run the tests","text":"

    First, ensure the test suite runs before making any changes:

    $ cmake -S. -B build\n$ cmake --build build -j 10\n$ ctest --test-dir build -j 10\n

    The test suite should report:

    100% tests passed, 0 tests failed out of 98\n
    "},{"location":"community/contribution_guidelines/#add-tests","title":"Add tests","text":"

    The tests are located in tests/src/unit-*.cpp and contain doctest assertions like CHECK. The tests are structured along the features of the library or the nature of the tests. Usually, it should be clear from the context which existing file needs to be extended, and only very few cases require creating new test files.

    When fixing a bug, edit unit-regression2.cpp and add a section referencing the fixed issue.

    "},{"location":"community/contribution_guidelines/#exceptions","title":"Exceptions","text":"

    When you test exceptions, please use CHECK_THROWS_WITH_AS which also takes the what() argument of the thrown exception into account.

    "},{"location":"community/contribution_guidelines/#coverage","title":"Coverage","text":"

    If test coverage decreases, an automatic warning comment will be posted on the pull request. You can access a code coverage report as an artifact to the \u201cUbuntu\u201d workflow.

    "},{"location":"community/contribution_guidelines/#update-the-documentation","title":"Update the documentation","text":"

    The main documentation of the library is generated from the files docs/mkdocs/docs. This folder contains dedicated pages for certain features, a list of all exceptions, and extensive API documentation with details on every public API function.

    Build the documentation locally using:

    make install_venv -C docs/mkdocs\nmake serve -C docs/mkdocs\n

    The documentation will then be available at http://127.0.0.1:8000/. See the documentation of mkdocs and Material for MkDocs for more information.

    "},{"location":"community/contribution_guidelines/#amalgamate-the-source-code","title":"Amalgamate the source code","text":"

    The single-header files single_include/nlohmann/json.hpp and single_include/nlohmann/json_fwd.hpp are generated from the source files in the include/nlohmann directory. Do not edit the files directly; instead, modify the include/nlohmann sources and regenerate the files by executing:

    make amalgamate\n
    "},{"location":"community/contribution_guidelines/#recommended-documentation","title":"Recommended documentation","text":"
    • The library\u2019s README file is an excellent starting point to understand its functionality.
    • The documentation page is the reference documentation of the library.
    • RFC 8259 is the reference for the JavaScript Object Notation (JSON) Data Interchange Format.
    "},{"location":"community/contribution_guidelines/#please-dont","title":"Please don't...","text":"

    Certain contributions are not helpful.

    "},{"location":"community/contribution_guidelines/#break-the-public-api","title":"Break the public API","text":"

    We take pride in the library being used by numerous customers across various industries. They all rely on the guarantees provided by semantic versioning. Please do not change the library such that the public API of the 3.x.y version is broken. This includes:

    • Changing function signatures (altering parameter types, return types, number of parameters) or changing the const-ness of member functions.
    • Removing functions.
    • Renaming functions or classes.
    • Changing exception handling.
    • Changing exception ids.
    • Changing access specifiers.
    • Changing default arguments.

    Although these guidelines may seem restrictive, they are essential for maintaining the library\u2019s utility.

    Breaking changes may be introduced when they are guarded with a feature macro such as JSON_USE_IMPLICIT_CONVERSIONS which allows selectively changing the behavior of the library. In next steps, the current behavior can then be deprecated. Using feature macros then allows users to test their code against the library in the next major release.

    "},{"location":"community/contribution_guidelines/#break-c11-language-conformance","title":"Break C++11 language conformance","text":"

    This library is designed to work with C++11 and later. This means that any supported C++11 compiler should compile the library without problems. Some compilers like GCC 4.7 (and earlier), Clang 3.3 (and earlier), or Microsoft Visual Studio 13.0 and earlier are known not to work due to missing or incomplete C++11 support.

    Please do not add features that do not work with the mentioned supported compilers. Please guard features from C++14 and later against the respective JSON_HAS_CPP_14 macros.

    "},{"location":"community/contribution_guidelines/#break-json-conformance","title":"Break JSON conformance","text":"

    Please refrain from proposing changes that would break JSON conformance. If you propose a conformant extension of JSON to be supported by the library, please motivate this extension.

    "},{"location":"community/contribution_guidelines/#wanted","title":"Wanted","text":"

    The following areas really need contribution and are always welcomed:

    • Extending the continuous integration toward more exotic compilers such as Android NDK, Intel's Compiler, or the bleeding-edge versions Clang.
    • Improving the efficiency of the JSON parser. The current parser is implemented as a naive recursive descent parser with hand-coded string handling. More sophisticated approaches like LALR parsers would be really appreciated. That said, parser generators like Bison or ANTLR do not play nice with single-header files -- I really would like to keep the parser inside the json.hpp header, and I am not aware of approaches similar to re2c for parsing.
    • Extending and updating existing benchmarks to include (the most recent version of) this library. Though efficiency is not everything, speed and memory consumption are very important characteristics for C++ developers, so having proper comparisons would be interesting.

    We look forward to your contributions and collaboration to enhance the library!

    "},{"location":"community/governance/","title":"Governance","text":"

    The governance model for the JSON for Modern C++ project is a Benevolent Dictator for Life (BDFL) structure. As the sole maintainer, Niels Lohmann is responsible for all key aspects of the project. The project governance may evolve as the project grows, but any changes will be documented here and communicated to contributors.

    "},{"location":"community/governance/#overview","title":"Overview","text":"

    This project is led by a benevolent dictator, Niels Lohmann, and managed by the community. That is, the community actively contributes to the day-to-day maintenance of the project, but the general strategic line is drawn by the benevolent dictator. In case of disagreement, they have the last word. It is the benevolent dictator\u2019s job to resolve disputes within the community and to ensure that the project is able to progress in a coordinated way. In turn, it is the community\u2019s job to guide the decisions of the benevolent dictator through active engagement and contribution.

    "},{"location":"community/governance/#roles-and-responsibilities","title":"Roles and responsibilities","text":""},{"location":"community/governance/#benevolent-dictator-project-lead","title":"Benevolent dictator (project lead)","text":"

    Typically, the benevolent dictator, or project lead, is self-appointed. However, because the community always has the ability to fork, this person is fully answerable to the community. The project lead\u2019s role is a difficult one: they set the strategic objectives of the project and communicate these clearly to the community. They also have to understand the community as a whole and strive to satisfy as many conflicting needs as possible, while ensuring that the project survives in the long term.

    In many ways, the role of the benevolent dictator is less about dictatorship and more about diplomacy. The key is to ensure that, as the project expands, the right people are given influence over it and the community rallies behind the vision of the project lead. The lead\u2019s job is then to ensure that the committers (see below) make the right decisions on behalf of the project. Generally speaking, as long as the committers are aligned with the project\u2019s strategy, the project lead will allow them to proceed as they desire.

    "},{"location":"community/governance/#committers","title":"Committers","text":"

    Committers are contributors who have made several valuable contributions to the project and are now relied upon to both write code directly to the repository and screen the contributions of others. In many cases they are programmers but it is also possible that they contribute in a different role. Typically, a committer will focus on a specific aspect of the project, and will bring a level of expertise and understanding that earns them the respect of the community and the project lead. The role of committer is not an official one, it is simply a position that influential members of the community will find themselves in as the project lead looks to them for guidance and support.

    Committers have no authority over the overall direction of the project. However, they do have the ear of the project lead. It is a committer\u2019s job to ensure that the lead is aware of the community\u2019s needs and collective objectives, and to help develop or elicit appropriate contributions to the project. Often, committers are given informal control over their specific areas of responsibility, and are assigned rights to directly modify certain areas of the source code. That is, although committers do not have explicit decision-making authority, they will often find that their actions are synonymous with the decisions made by the lead.

    "},{"location":"community/governance/#contributors","title":"Contributors","text":"

    Contributors are community members who either have no desire to become committers, or have not yet been given the opportunity by the benevolent dictator. They make valuable contributions, such as those outlined in the list below, but generally do not have the authority to make direct changes to the project code. Contributors engage with the project through communication tools, such as email lists, and via reports and patches attached to issues in the issue tracker, as detailed in our community tools document.

    Anyone can become a contributor. There is no expectation of commitment to the project, no specific skill requirements and no selection process. To become a contributor, a community member simply has to perform one or more actions that are beneficial to the project.

    Some contributors will already be engaging with the project as users, but will also find themselves doing one or more of the following:

    • supporting new users (current users often provide the most effective new user support)
    • reporting bugs
    • identifying requirements
    • supplying graphics and web design
    • programming
    • assisting with project infrastructure
    • writing documentation
    • fixing bugs
    • adding features

    As contributors gain experience and familiarity with the project, they may find that the project lead starts relying on them more and more. When this begins to happen, they gradually adopt the role of committer, as described above.

    "},{"location":"community/governance/#users","title":"Users","text":"

    Users are community members who have a need for the project. They are the most important members of the community: without them, the project would have no purpose. Anyone can be a user; there are no specific requirements.

    Users should be encouraged to participate in the life of the project and the community as much as possible. User contributions enable the project team to ensure that they are satisfying the needs of those users. Common user activities include (but are not limited to):

    • evangelising about the project
    • informing developers of project strengths and weaknesses from a new user\u2019s perspective
    • providing moral support (a \u2018thank you\u2019 goes a long way)
    • providing financial support

    Users who continue to engage with the project and its community will often find themselves becoming more and more involved. Such users may then go on to become contributors, as described above.

    "},{"location":"community/governance/#support","title":"Support","text":"

    All participants in the community are encouraged to provide support for new users within the project management infrastructure. This support is provided as a way of growing the community. Those seeking support should recognise that all support activity within the project is voluntary and is therefore provided as and when time allows. A user requiring guaranteed response times or results should therefore seek to purchase a support contract from a vendor. (Of course, that vendor should be an active member of the community.) However, for those willing to engage with the project on its own terms, and willing to help support other users, the community support channels are ideal.

    "},{"location":"community/governance/#contribution-process","title":"Contribution Process","text":"

    Anyone can contribute to the project, regardless of their skills, as there are many ways to contribute. For instance, a contributor might be active on the project mailing list and issue tracker, or might supply patches. The various ways of contributing are described in more detail in our roles in open source document.

    The developer mailing list is the most appropriate place for a contributor to ask for help when making their first contribution.

    "},{"location":"community/governance/#decision-making-process","title":"Decision-Making Process","text":"

    The benevolent dictatorship model does not need a formal conflict resolution process, since the project lead\u2019s word is final. If the community chooses to question the wisdom of the actions of a committer, the project lead can review their decisions by checking the email archives, and either uphold or reverse them.

    Source

    The text was taken from http://oss-watch.ac.uk/resources/benevolentdictatorgovernancemodel.

    "},{"location":"community/quality_assurance/","title":"Quality assurance","text":"

    Ensuring quality is paramount for this project, particularly because numerous other projects depend on it. Each commit to the library undergoes rigorous checks against the following requirements, and any violations will result in a failed build.

    "},{"location":"community/quality_assurance/#c-language-compliance-and-compiler-compatibility","title":"C++ language compliance and compiler compatibility","text":"

    Requirement: Compiler support

    Any compiler with complete C++11 support can compile the library without warnings.

    • The library is compiled with 50+ different C++ compilers with different operating systems and platforms, including the oldest versions known to compile the library.

      Compilers used in continuous integration Compiler Architecture Operating System CI AppleClang 14.0.0.14000029; Xcode 14.1 x86_64 macOS 13.7.2 (Ventura) GitHub AppleClang 14.0.0.14000029; Xcode 14.2 x86_64 macOS 13.7.2 (Ventura) GitHub AppleClang 14.0.3.14030022; Xcode 14.3.1 x86_64 macOS 13.7.2 (Ventura) GitHub AppleClang 15.0.0.15000040; Xcode 15.0.1 x86_64 macOS 13.7.2 (Ventura) GitHub AppleClang 15.0.0.15000100; Xcode 15.1 x86_64 macOS 13.7.2 (Ventura) GitHub AppleClang 15.0.0.15000100; Xcode 15.2 x86_64 macOS 13.7.2 (Ventura) GitHub AppleClang 15.0.0.15000309; Xcode 15.3 arm64 macOS 14.7.2 (Sonoma) GitHub AppleClang 15.0.0.15000309; Xcode 15.4 arm64 macOS 14.7.2 (Sonoma) GitHub AppleClang 16.0.0.16000026; Xcode 16 arm64 macOS 15.2 (Sequoia) GitHub AppleClang 16.0.0.16000026; Xcode 16.1 arm64 macOS 15.2 (Sequoia) GitHub AppleClang 16.0.0.16000026; Xcode 16.2 arm64 macOS 15.2 (Sequoia) GitHub AppleClang 17.0.0.17000013; Xcode 16.3 arm64 macOS 15.5 (Sequoia) GitHub Clang 3.5.2 x86_64 Ubuntu 22.04.1 LTS GitHub Clang 3.6.2 x86_64 Ubuntu 22.04.1 LTS GitHub Clang 3.7.1 x86_64 Ubuntu 22.04.1 LTS GitHub Clang 3.8.1 x86_64 Ubuntu 22.04.1 LTS GitHub Clang 3.9.1 x86_64 Ubuntu 22.04.1 LTS GitHub Clang 4.0.1 x86_64 Ubuntu 22.04.1 LTS GitHub Clang 5.0.2 x86_64 Ubuntu 22.04.1 LTS GitHub Clang 6.0.1 x86_64 Ubuntu 22.04.1 LTS GitHub Clang 7.1.0 x86_64 Ubuntu 22.04.1 LTS GitHub Clang 8.0.1 x86_64 Ubuntu 22.04.1 LTS GitHub Clang 9.0.1 x86_64 Ubuntu 22.04.1 LTS GitHub Clang 10.0.1 x86_64 Ubuntu 22.04.1 LTS GitHub Clang 11.0.0 with GNU-like command-line x86_64 Windows 10 (Build 17763) GitHub Clang 11.1.0 x86_64 Ubuntu 22.04.1 LTS GitHub Clang 12.0.0 with GNU-like command-line x86_64 Windows 10 (Build 17763) GitHub Clang 12.0.0 with MSVC-like command-line x86_64 Windows 10 (Build 17763) GitHub Clang 12.0.1 x86_64 Ubuntu 22.04.1 LTS GitHub Clang 13.0.0 with GNU-like command-line x86_64 Windows 10 (Build 17763) GitHub Clang 13.0.1 x86_64 Ubuntu 22.04.1 LTS GitHub Clang 14.0.0 with GNU-like command-line x86_64 Windows 10 (Build 17763) GitHub Clang 14.0.6 x86_64 Ubuntu 22.04.1 LTS GitHub Clang 15.0.0 with GNU-like command-line x86_64 Windows 10 (Build 17763) GitHub Clang 15.0.7 x86_64 Ubuntu 22.04.1 LTS GitHub Clang 16.0.6 x86_64 Ubuntu 22.04.1 LTS GitHub Clang 17.0.6 x86_64 Ubuntu 22.04.1 LTS GitHub Clang 18.1.8 x86_64 Ubuntu 22.04.1 LTS GitHub Clang 19.1.7 x86_64 Ubuntu 22.04.1 LTS GitHub Clang 20.1.1 x86_64 Ubuntu 22.04.1 LTS GitHub Clang 21.0.0 x86_64 Ubuntu 22.04.1 LTS GitHub Emscripten 4.0.6 x86_64 Ubuntu 22.04.1 LTS GitHub GNU 4.8.5 x86_64 Ubuntu 22.04.1 LTS GitHub GNU 4.9.3 x86_64 Ubuntu 22.04.1 LTS GitHub GNU 5.5.0 x86_64 Ubuntu 22.04.1 LTS GitHub GNU 6.4.0 x86_64 Ubuntu 22.04.1 LTS GitHub GNU 7.5.0 x86_64 Ubuntu 22.04.1 LTS GitHub GNU 8.5.0 x86_64 Ubuntu 22.04.1 LTS GitHub GNU 9.3.0 x86_64 Ubuntu 22.04.1 LTS GitHub GNU 9.4.0 x86_64 Ubuntu 22.04.1 LTS GitHub GNU 9.5.0 x86_64 Ubuntu 22.04.1 LTS GitHub GNU 10.5.0 x86_64 Ubuntu 22.04.1 LTS GitHub GNU 11.4.0 x86_64 Ubuntu 22.04.1 LTS GitHub GNU 11.5.0 x86_64 Ubuntu 22.04.1 LTS GitHub GNU 12.2.0 (MinGW-W64 i686-ucrt-posix-dwarf) x86_64 Windows 10 (Build 17763) GitHub GNU 12.2.0 (MinGW-W64 x86_64-ucrt-posix-seh) x86_64 Windows 10 (Build 17763) GitHub GNU 12.4.0 x86_64 Ubuntu 22.04.1 LTS GitHub GNU 13.3.0 x86_64 Ubuntu 22.04.1 LTS GitHub GNU 14.2.0 x86_64 Ubuntu 22.04.1 LTS GitHub GNU 14.2.0 arm64 Linux 6.1.100 Cirrus CI GNU 15.1.0 x86_64 Ubuntu 22.04.1 LTS GitHub icpc (ICC) 2021.5.0 20211109 x86_64 Ubuntu 20.04.3 LTS GitHub MSVC 19.0.24241.7 x86 Windows 8.1 AppVeyor MSVC 19.16.27035.0 x86 Windows-10 (Build 14393) AppVeyor MSVC 19.29.30157.0 x86 Windows 10 (Build 17763) GitHub MSVC 19.29.30157.0 x86_64 Windows 10 (Build 17763) GitHub MSVC 19.29.30157.0 x86 Windows-10 (Build 17763) AppVeyor MSVC 19.42.34435.0 x86 Windows 10 (Build 20348) GitHub MSVC 19.42.34435.0 x86_64 Windows 10 (Build 20348) GitHub

    • The library is compiled with all C++ language revisions (C++11, C++14, C++17, C++20, C++23, and C++26) to detect and fix language deprecations early.

    • The library is checked for compiler warnings:

    • On Clang, -Weverything is used with 7 exceptions.

      Clang warnings 
      # Ignored Clang warnings:\n# -Wno-c++98-compat               The library targets C++11.\n# -Wno-c++98-compat-pedantic      The library targets C++11.\n# -Wno-deprecated-declarations    The library contains annotations for deprecated functions.\n# -Wno-extra-semi-stmt            The library uses assert which triggers this warning.\n# -Wno-padded                     We do not care about padding warnings.\n# -Wno-covered-switch-default     All switches list all cases and a default case.\n# -Wno-unsafe-buffer-usage        Otherwise Doctest would not compile.\n\nset(CLANG_CXXFLAGS\n    -Werror\n    -Weverything\n    -Wno-c++98-compat\n    -Wno-c++98-compat-pedantic\n    -Wno-deprecated-declarations\n    -Wno-extra-semi-stmt\n    -Wno-padded\n    -Wno-covered-switch-default\n    -Wno-unsafe-buffer-usage\n)\n

    • On GCC, 300+ warnings are enabled with 8 exceptions.

      GCC warnings 
      # Warning flags determined for GCC 15.1.0 with https://github.com/nlohmann/gcc_flags:\n# Ignored GCC warnings:\n# -Wno-abi-tag           We do not care about ABI tags.\n# -Wno-aggregate-return  The library uses aggregate returns.\n# -Wno-long-long         The library uses the long long type to interface with system functions.\n# -Wno-namespaces        The library uses namespaces.\n# -Wno-nrvo              Doctest triggers this warning.\n# -Wno-padded            We do not care about padding warnings.\n# -Wno-system-headers    We do not care about warnings in system headers.\n# -Wno-templates         The library uses templates.\n\nset(GCC_CXXFLAGS\n    -pedantic\n    -Werror\n    --all-warnings\n    --extra-warnings\n    -W\n    -WNSObject-attribute\n    -Wno-abi-tag\n    -Waddress\n    -Waddress-of-packed-member\n    -Wno-aggregate-return\n    -Waggressive-loop-optimizations\n    -Waligned-new=all\n    -Wall\n    -Walloc-size\n    -Walloc-zero\n    -Walloca\n    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-Wunused\n    -Wunused-but-set-parameter\n    -Wunused-but-set-variable\n    -Wunused-const-variable=2\n    -Wunused-function\n    -Wunused-label\n    -Wunused-local-typedefs\n    -Wunused-macros\n    -Wunused-parameter\n    -Wunused-result\n    -Wunused-value\n    -Wunused-variable\n    -Wuse-after-free=3\n    -Wuseless-cast\n    -Wvarargs\n    -Wvariadic-macros\n    -Wvector-operation-performance\n    -Wvexing-parse\n    -Wvirtual-inheritance\n    -Wvirtual-move-assign\n    -Wvla\n    -Wvla-parameter\n    -Wvolatile\n    -Wvolatile-register-var\n    -Wwrite-strings\n    -Wxor-used-as-pow\n    -Wzero-as-null-pointer-constant\n    -Wzero-length-bounds\n)\n
    "},{"location":"community/quality_assurance/#c-standard-library-compliance","title":"C++ standard library compliance","text":"

    Requirement: No prerequisites

    The library has no prerequisites other than the Standard Template Library (STL).

    • The library is compiled and tested with both libc++ and libstdc++ to detect subtle differences or incompatibilities.
    • The code checked with Include What You Use (IWYU) that all required standard headers are included.
    • On Windows, the library is compiled with <Windows.h> being included to detect and avoid common bugs.
    • The library is compiled with exceptions disabled to support alternative means of error handling.
    "},{"location":"community/quality_assurance/#stable-public-api","title":"Stable public API","text":"

    Requirement: Stable public API

    Any change to the library does not break the public API.

    • All public API functions are tested with a variety of arguments.
    • The library is compiled and tested with different template arguments for number, string, array, and object types.
    • Unit tests cover all lines of the code base.
    • Every exception of the library is thrown in the test suite, and the error messages and exception ids are checked.

    Requirement: Complete documentation

    The public API is extensively documented.

    • Every public API function has a dedicated page in the API reference documentation with a self-contained code example.
    • All examples in the documentation are tested, and changes in their output are treated as an error.
    "},{"location":"community/quality_assurance/#robust-input-processing","title":"Robust input processing","text":"

    Requirement: Standards compliance

    The library is compliant to JSON as defined in RFC 8259.

    • The lexer is tested with all valid Unicode code points and all prefixes of all invalid Unicode code points.
    • The parser is tested against extensive correctness suites for JSON compliance.
    • In addition, the library is continuously fuzz-tested at OSS-Fuzz where the library is checked against billions of inputs.
    "},{"location":"community/quality_assurance/#static-analysis","title":"Static analysis","text":"

    Requirement: State-of-the-art code analysis

    The code is checked with state-of-the-art static code analysis tools.

    • The code is checked with the latest Clang-Tidy.

      Clang-Tidy configuration (.clang-tidy) 
      # TODO: The first three checks are only removed to get the CI going. They have to be addressed at some point.\n# TODO: portability-avoid-pragma-once: should be fixed eventually\n\nChecks: '*,\n\n         -portability-template-virtual-member-function,\n         -bugprone-use-after-move,\n         -hicpp-invalid-access-moved,\n\n         -altera-id-dependent-backward-branch,\n         -altera-struct-pack-align,\n         -altera-unroll-loops,\n         -android-cloexec-fopen,\n         -boost-use-ranges,\n         -bugprone-easily-swappable-parameters,\n         -cert-err58-cpp,\n         -clang-analyzer-webkit.NoUncountedMemberChecker,\n         -concurrency-mt-unsafe,\n         -cppcoreguidelines-avoid-const-or-ref-data-members,\n         -cppcoreguidelines-avoid-do-while,\n         -cppcoreguidelines-avoid-goto,\n         -cppcoreguidelines-avoid-magic-numbers,\n         -cppcoreguidelines-avoid-non-const-global-variables,\n         -cppcoreguidelines-macro-usage,\n         -cppcoreguidelines-pro-bounds-array-to-pointer-decay,\n         -cppcoreguidelines-pro-bounds-constant-array-index,\n         -cppcoreguidelines-pro-bounds-pointer-arithmetic,\n         -cppcoreguidelines-pro-type-reinterpret-cast,\n         -cppcoreguidelines-pro-type-union-access,\n         -cppcoreguidelines-rvalue-reference-param-not-moved,\n         -cppcoreguidelines-virtual-class-destructor,\n         -fuchsia-default-arguments-calls,\n         -fuchsia-default-arguments-declarations,\n         -fuchsia-overloaded-operator,\n         -google-explicit-constructor,\n         -google-readability-function-size,\n         -google-runtime-int,\n         -google-runtime-references,\n         -hicpp-avoid-goto,\n         -hicpp-explicit-conversions,\n         -hicpp-function-size,\n         -hicpp-no-array-decay,\n         -hicpp-no-assembler,\n         -hicpp-signed-bitwise,\n         -hicpp-uppercase-literal-suffix,\n         -llvm-header-guard,\n         -llvm-include-order,\n         -llvmlibc-*,\n         -misc-use-anonymous-namespace,\n         -misc-confusable-identifiers,\n         -misc-include-cleaner,\n         -misc-no-recursion,\n         -misc-non-private-member-variables-in-classes,\n         -modernize-concat-nested-namespaces,\n         -modernize-type-traits,\n         -modernize-use-constraints,\n         -modernize-use-designated-initializers,\n         -modernize-use-nodiscard,\n         -modernize-use-ranges,\n         -modernize-use-std-numbers,\n         -modernize-use-trailing-return-type,\n         -performance-enum-size,\n         -portability-avoid-pragma-once,\n         -readability-function-cognitive-complexity,\n         -readability-function-size,\n         -readability-identifier-length,\n         -readability-magic-numbers,\n         -readability-redundant-access-specifiers,\n         -readability-simplify-boolean-expr,\n         -readability-uppercase-literal-suffix'\n\nCheckOptions:\n  - key: hicpp-special-member-functions.AllowSoleDefaultDtor\n    value: 1\n\nWarningsAsErrors: '*'\n\n#HeaderFilterRegex: '.*nlohmann.*'\nHeaderFilterRegex: '.*hpp$'\n

    • The code is checked with the latest Cppcheck with all warnings enabled.

    • The code is checked with the latest Clang Static Analyzer with 89 enabled rules.
    • The code is checked with Infer.
    • The code is checked with Codacy.
    "},{"location":"community/quality_assurance/#dynamic-analysis","title":"Dynamic analysis","text":"

    Requirement: Correctness

    The library is checked for memory correctness and absence of undefined behavior.

    • The test suite is executed with enabled runtime assertions to check invariants and preconditions of functions to detect undefined behavior.
    • The test suite is executed with Valgrind (Memcheck) to detect memory leaks.
    • The test suite is executed with Sanitizers (address sanitizer, undefined behavior sanitizer, integer overflow detection, nullability violations).
    "},{"location":"community/quality_assurance/#style-check","title":"Style check","text":"

    Requirement: Common code style

    A common code style is used throughout all code files of the library.

    • The code is formatted with Artistic Style (astyle) against a style configuration that is also enforced in the CI.

      Astyle configuration (tools/astyle/.astylerc) 
      # Configuration for Artistic Style\n# see https://astyle.sourceforge.net/astyle.html\n\n#######################\n# Brace Style Options #\n#######################\n\n# use Allman style for braces\n--style=allman\n\n###############\n# Tab Options #\n###############\n\n# indent using 4 spaces\n--indent=spaces=4\n\n#######################\n# Indentation Options #\n#######################\n\n# indent access modifiers one half indent\n--indent-modifiers\n\n# indent switch cases to the switch block\n--indent-switches\n\n# indent preprocessor blocks\n--indent-preproc-block\n\n# indent preprocessor defines\n--indent-preproc-define\n\n# indent C++ comments\n--indent-col1-comments\n\n###################\n# Padding Options #\n###################\n\n# insert space padding around operators\n--pad-oper\n\n# insert space between if/for/while... and the following parentheses\n--pad-header\n\n# attach the pointer to the variable type (left)\n--align-pointer=type\n\n# attach the reference to the variable type (left)\n--align-reference=type\n\n######################\n# Formatting Options #\n######################\n\n# add braces to unbraced one line conditional statements\n--add-braces\n\n# convert tabs to spaces\n--convert-tabs\n\n# closes whitespace between the ending angle brackets of template definitions\n--close-templates\n\n#################\n# Other Options #\n#################\n\n# do not create backup files\n--suffix=none\n\n# preserve the original file date\n--preserve-date\n\n# display only the files that have been formatted\n--formatted\n\n# for the linux (LF) line end style\n--lineend=linux\n

    • The code style is checked with cpplint with 61 enabled rules.

    "},{"location":"community/quality_assurance/#simple-integration","title":"Simple integration","text":"

    Requirement: Single header

    The library can be used by adding a single header to a C++ project.

    • An amalgamation script is used to check if the source code is exposed as a self-contained single-header file.
    • The test suite is checked against the amalgamated source file as well as the individual source file.

    Requirement: CMake as primary development tool

    All library functions are exposed and usable by CMake.

    • All library options are exposed as CMake options and tested.
    • The library is tested against relevant CMake versions:
    • CMake 3.5 (the earliest supported)
    • CMake 3.31.6 (the latest 3.x release)
    • CMake 4.0.0 (a very recent release)
    "},{"location":"community/security_policy/","title":"Security Policy","text":""},{"location":"community/security_policy/#reporting-a-vulnerability","title":"Reporting a Vulnerability","text":"

    We value the security of our users and appreciate your efforts to responsibly disclose vulnerabilities. If you have identified a security vulnerability in this repository, please use the GitHub Security Advisory \"Report a Vulnerability\" tab.

    Until it is published, this draft security advisory will only be visible to the maintainers of this project. Other users and teams may be added once the advisory is created.

    We will send a response indicating the next steps in handling your report. After the initial reply to your report, we will keep you informed of the progress towards a fix and full announcement and may ask for additional information or guidance.

    For vulnerabilities in third-party dependencies or modules, please report them directly to the respective maintainers.

    "},{"location":"community/security_policy/#additional-resources","title":"Additional Resources","text":"
    • Explore security-related topics and contribute to tools and projects through GitHub Security Lab.
    • Learn more about responsible disclosure and reporting vulnerabilities in GitHub at About coordinated disclosure of security vulnerabilities.

    We sincerely thank you for contributing to the security and integrity of this project!

    "},{"location":"features/arbitrary_types/","title":"Arbitrary Type Conversions","text":"

    Every type can be serialized in JSON, not just STL containers and scalar types. Usually, you would do something along those lines:

    namespace ns {\n    // a simple struct to model a person\n    struct person {\n        std::string name;\n        std::string address;\n        int age;\n    };\n} // namespace ns\n\nns::person p = {\"Ned Flanders\", \"744 Evergreen Terrace\", 60};\n\n// convert to JSON: copy each value into the JSON object\njson j;\nj[\"name\"] = p.name;\nj[\"address\"] = p.address;\nj[\"age\"] = p.age;\n\n// ...\n\n// convert from JSON: copy each value from the JSON object\nns::person p {\n    j[\"name\"].template get<std::string>(),\n    j[\"address\"].template get<std::string>(),\n    j[\"age\"].template get<int>()\n};\n

    It works, but that's quite a lot of boilerplate... Fortunately, there's a better way:

    // create a person\nns::person p {\"Ned Flanders\", \"744 Evergreen Terrace\", 60};\n\n// conversion: person -> json\njson j = p;\n\nstd::cout << j << std::endl;\n// {\"address\":\"744 Evergreen Terrace\",\"age\":60,\"name\":\"Ned Flanders\"}\n\n// conversion: json -> person\nauto p2 = j.template get<ns::person>();\n\n// that's it\nassert(p == p2);\n
    "},{"location":"features/arbitrary_types/#basic-usage","title":"Basic usage","text":"

    To make this work with one of your types, you only need to provide two functions:

    using json = nlohmann::json;\n\nnamespace ns {\n    void to_json(json& j, const person& p) {\n        j = json{ {\"name\", p.name}, {\"address\", p.address}, {\"age\", p.age} };\n    }\n\n    void from_json(const json& j, person& p) {\n        j.at(\"name\").get_to(p.name);\n        j.at(\"address\").get_to(p.address);\n        j.at(\"age\").get_to(p.age);\n    }\n} // namespace ns\n

    That's all! When calling the json constructor with your type, your custom to_json method will be automatically called. Likewise, when calling template get<your_type>() or get_to(your_type&), the from_json method will be called.

    Some important things:

    • Those methods MUST be in your type's namespace (which can be the global namespace), or the library will not be able to locate them (in this example, they are in namespace ns, where person is defined).
    • Those methods MUST be available (e.g., proper headers must be included) everywhere you use these conversions. Look at #1108 for errors that may occur otherwise.
    • When using template get<your_type>(), your_type MUST be DefaultConstructible. (There is a way to bypass this requirement described later.)
    • In function from_json, use function at() to access the object values rather than operator[]. In case a key does not exist, at throws an exception that you can handle, whereas operator[] exhibits undefined behavior.
    • You do not need to add serializers or deserializers for STL types like std::vector: the library already implements these.
    "},{"location":"features/arbitrary_types/#simplify-your-life-with-macros","title":"Simplify your life with macros","text":"

    If you just want to serialize/deserialize some structs, the to_json/from_json functions can be a lot of boilerplate.

    There are six macros to make your life easier as long as you (1) want to use a JSON object as serialization and (2) want to use the member variable names as object keys in that object:

    • NLOHMANN_DEFINE_TYPE_NON_INTRUSIVE(name, member1, member2, ...) is to be defined inside the namespace of the class/struct to create code for. It will throw an exception in from_json() due to a missing value in the JSON object.
    • NLOHMANN_DEFINE_TYPE_NON_INTRUSIVE_WITH_DEFAULT(name, member1, member2, ...) is to be defined inside the namespace of the class/struct to create code for. It will not throw an exception in from_json() due to a missing value in the JSON object, but fills in values from an object which is default-constructed by the type.
    • NLOHMANN_DEFINE_TYPE_NON_INTRUSIVE_ONLY_SERIALIZE(name, member1, member2, ...) is to be defined inside the namespace of the class/struct to create code for. It does not define a from_json() function which is needed in case the type does not have a default constructor.
    • NLOHMANN_DEFINE_TYPE_INTRUSIVE(name, member1, member2, ...) is to be defined inside the class/struct to create code for. This macro can also access private members. It will throw an exception in from_json() due to a missing value in the JSON object.
    • NLOHMANN_DEFINE_TYPE_INTRUSIVE_WITH_DEFAULT(name, member1, member2, ...) is to be defined inside the class/struct to create code for. This macro can also access private members. It will not throw an exception in from_json() due to a missing value in the JSON object, but fills in values from an object which is default-constructed by the type.
    • NLOHMANN_DEFINE_TYPE_INTRUSIVE_ONLY_SERIALIZE(name, member1, member2, ...) is to be defined inside the class/struct to create code for. This macro can also access private members. It does not define a from_json() function which is needed in case the type does not have a default constructor.

    Furthermore, there exist versions to use in the case of derived classes:

    Need access to private members Need only de-serialization Allow missing values when de-serializing macro NLOHMANN_DEFINE_TYPE_INTRUSIVE NLOHMANN_DEFINE_TYPE_INTRUSIVE_WITH_DEFAULT NLOHMANN_DEFINE_TYPE_INTRUSIVE_ONLY_SERIALIZE NLOHMANN_DEFINE_TYPE_NON_INTRUSIVE NLOHMANN_DEFINE_TYPE_NON_INTRUSIVE_WITH_DEFAULT NLOHMANN_DEFINE_TYPE_NON_INTRUSIVE_ONLY_SERIALIZE

    For derived classes and structs, use the following macros

    Need access to private members Need only de-serialization Allow missing values when de-serializing macro NLOHMANN_DEFINE_DERIVED_TYPE_INTRUSIVE NLOHMANN_DEFINE_DERIVED_TYPE_INTRUSIVE_WITH_DEFAULT NLOHMANN_DEFINE_DERIVED_TYPE_INTRUSIVE_ONLY_SERIALIZE NLOHMANN_DEFINE_DERIVED_TYPE_NON_INTRUSIVE NLOHMANN_DEFINE_DERIVED_TYPE_NON_INTRUSIVE_WITH_DEFAULT NLOHMANN_DEFINE_DERIVED_TYPE_NON_INTRUSIVE_ONLY_SERIALIZE

    Implementation limits

    • The current macro implementations are limited to at most 64 member variables. If you want to serialize/deserialize types with more than 64 member variables, you need to define the to_json/from_json functions manually.
    Example

    The to_json/from_json functions for the person struct above can be created with:

    namespace ns {\n    NLOHMANN_DEFINE_TYPE_NON_INTRUSIVE(person, name, address, age)\n}\n

    Here is an example with private members, where NLOHMANN_DEFINE_TYPE_INTRUSIVE is needed:

    namespace ns {\n    class address {\n      private:\n        std::string street;\n        int housenumber;\n        int postcode;\n\n      public:\n        NLOHMANN_DEFINE_TYPE_INTRUSIVE(address, street, housenumber, postcode)\n    };\n}\n
    "},{"location":"features/arbitrary_types/#how-do-i-convert-third-party-types","title":"How do I convert third-party types?","text":"

    This requires a bit more advanced technique. But first, let us see how this conversion mechanism works:

    The library uses JSON Serializers to convert types to JSON. The default serializer for nlohmann::json is nlohmann::adl_serializer (ADL means Argument-Dependent Lookup).

    It is implemented like this (simplified):

    template <typename T>\nstruct adl_serializer {\n    static void to_json(json& j, const T& value) {\n        // calls the \"to_json\" method in T's namespace\n    }\n\n    static void from_json(const json& j, T& value) {\n        // same thing, but with the \"from_json\" method\n    }\n};\n

    This serializer works fine when you have control over the type's namespace. However, what about boost::optional or std::filesystem::path (C++17)? Hijacking the boost namespace is pretty bad, and it's illegal to add something other than template specializations to std...

    To solve this, you need to add a specialization of adl_serializer to the nlohmann namespace, here's an example:

    // partial specialization (full specialization works too)\nNLOHMANN_JSON_NAMESPACE_BEGIN\ntemplate <typename T>\nstruct adl_serializer<boost::optional<T>> {\n    static void to_json(json& j, const boost::optional<T>& opt) {\n        if (opt == boost::none) {\n            j = nullptr;\n        } else {\n            j = *opt; // this will call adl_serializer<T>::to_json which will\n                      // find the free function to_json in T's namespace!\n        }\n    }\n\n    static void from_json(const json& j, boost::optional<T>& opt) {\n        if (j.is_null()) {\n            opt = boost::none;\n        } else {\n            opt = j.template get<T>(); // same as above, but with\n                              // adl_serializer<T>::from_json\n        }\n    }\n};\nNLOHMANN_JSON_NAMESPACE_END\n

    ABI compatibility

    Use NLOHMANN_JSON_NAMESPACE_BEGIN and NLOHMANN_JSON_NAMESPACE_END instead of namespace nlohmann { } in code which may be linked with different versions of this library.

    "},{"location":"features/arbitrary_types/#how-can-i-use-get-for-non-default-constructiblenon-copyable-types","title":"How can I use get() for non-default constructible/non-copyable types?","text":"

    There is a way if your type is MoveConstructible. You will need to specialize the adl_serializer as well, but with a special from_json overload:

    struct move_only_type {\n    move_only_type() = delete;\n    move_only_type(int ii): i(ii) {}\n    move_only_type(const move_only_type&) = delete;\n    move_only_type(move_only_type&&) = default;\n\n    int i;\n};\n\nnamespace nlohmann {\n    template <>\n    struct adl_serializer<move_only_type> {\n        // note: the return type is no longer 'void', and the method only takes\n        // one argument\n        static move_only_type from_json(const json& j) {\n            return {j.template get<int>()};\n        }\n\n        // Here's the catch! You must provide a to_json method! Otherwise, you\n        // will not be able to convert move_only_type to json, since you fully\n        // specialized adl_serializer on that type\n        static void to_json(json& j, move_only_type t) {\n            j = t.i;\n        }\n    };\n}\n
    "},{"location":"features/arbitrary_types/#can-i-write-my-own-serializer-advanced-use","title":"Can I write my own serializer? (Advanced use)","text":"

    Yes. You might want to take a look at unit-udt.cpp in the test suite, to see a few examples.

    If you write your own serializer, you will need to do a few things:

    • use a different basic_json alias than nlohmann::json (the last template parameter of basic_json is the JSONSerializer)
    • use your basic_json alias (or a template parameter) in all your to_json/from_json methods
    • use nlohmann::to_json and nlohmann::from_json when you need ADL

    Here is an example, without simplifications, that only accepts types with a size <= 32, and uses ADL.

    // You should use void as a second template argument\n// if you don't need compile-time checks on T\ntemplate<typename T, typename SFINAE = typename std::enable_if<sizeof(T) <= 32>::type>\nstruct less_than_32_serializer {\n    template <typename BasicJsonType>\n    static void to_json(BasicJsonType& j, T value) {\n        // we want to use ADL, and call the correct to_json overload\n        using nlohmann::to_json; // this method is called by adl_serializer,\n                                 // this is where the magic happens\n        to_json(j, value);\n    }\n\n    template <typename BasicJsonType>\n    static void from_json(const BasicJsonType& j, T& value) {\n        // same thing here\n        using nlohmann::from_json;\n        from_json(j, value);\n    }\n};\n

    Be very careful when reimplementing your serializer, you can stack overflow if you don't pay attention:

    template <typename T, void>\nstruct bad_serializer\n{\n    template <typename BasicJsonType>\n    static void to_json(BasicJsonType& j, const T& value) {\n      // this calls BasicJsonType::json_serializer<T>::to_json(j, value);\n      // if BasicJsonType::json_serializer == bad_serializer ... oops!\n      j = value;\n    }\n\n    template <typename BasicJsonType>\n    static void from_json(const BasicJsonType& j, T& value) {\n      // this calls BasicJsonType::json_serializer<T>::from_json(j, value);\n      // if BasicJsonType::json_serializer == bad_serializer ... oops!\n      value = j.template template get<T>(); // oops!\n    }\n};\n
    "},{"location":"features/assertions/","title":"Runtime Assertions","text":"

    The code contains numerous debug assertions to ensure class invariants are valid or to detect undefined behavior. Whereas the former class invariants are nothing to be concerned with, the latter checks for undefined behavior are to detect bugs in client code.

    "},{"location":"features/assertions/#switch-off-runtime-assertions","title":"Switch off runtime assertions","text":"

    Runtime assertions can be switched off by defining the preprocessor macro NDEBUG (see the documentation of assert) which is the default for release builds.

    "},{"location":"features/assertions/#change-assertion-behavior","title":"Change assertion behavior","text":"

    The behavior of runtime assertions can be changes by defining macro JSON_ASSERT(x) before including the json.hpp header.

    "},{"location":"features/assertions/#function-with-runtime-assertions","title":"Function with runtime assertions","text":""},{"location":"features/assertions/#unchecked-object-access-to-a-const-value","title":"Unchecked object access to a const value","text":"

    Function operator[] implements unchecked access for objects. Whereas a missing key is added in the case of non-const objects, accessing a const object with a missing key is undefined behavior (think of a dereferenced null pointer) and yields a runtime assertion.

    If you are not sure whether an element in an object exists, use checked access with the at function or call the contains function before.

    See also the documentation on element access.

    Example 1: Missing object key

    The following code will trigger an assertion at runtime:

    #include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    const json j = {{\"key\", \"value\"}};\n    auto v = j[\"missing\"];\n}\n

    Output:

    Assertion failed: (m_value.object->find(key) != m_value.object->end()), function operator[], file json.hpp, line 2144.\n
    "},{"location":"features/assertions/#constructing-from-an-uninitialized-iterator-range","title":"Constructing from an uninitialized iterator range","text":"

    Constructing a JSON value from an iterator range (see constructor) with an uninitialized iterator is undefined behavior and yields a runtime assertion.

    Example 2: Uninitialized iterator range

    The following code will trigger an assertion at runtime:

    #include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    json::iterator it1, it2;\n    json j(it1, it2);\n}\n

    Output:

    Assertion failed: (m_object != nullptr), function operator++, file iter_impl.hpp, line 368.\n
    "},{"location":"features/assertions/#operations-on-uninitialized-iterators","title":"Operations on uninitialized iterators","text":"

    Any operation on uninitialized iterators (i.e., iterators that are not associated with any JSON value) is undefined behavior and yields a runtime assertion.

    Example 3: Uninitialized iterator

    The following code will trigger an assertion at runtime:

    #include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n  json::iterator it;\n  ++it;\n}\n

    Output:

    Assertion failed: (m_object != nullptr), function operator++, file iter_impl.hpp, line 368.\n
    "},{"location":"features/assertions/#changes","title":"Changes","text":""},{"location":"features/assertions/#reading-from-a-null-file-or-char-pointer","title":"Reading from a null FILE or char pointer","text":"

    Reading from a null FILE or char pointer in C++ is undefined behavior. Until version 3.12.0, this library asserted that the pointer was not nullptr using a runtime assertion. If assertions were disabled, this would result in undefined behavior. Since version 3.12.0, this library checks for nullptr and throws a parse_error.101 to prevent the undefined behavior.

    Example 4: Reading from null pointer

    The following code will trigger an assertion at runtime:

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    std::FILE* f = std::fopen(\"nonexistent_file.json\", \"r\");\n    try {\n        json j = json::parse(f);\n    } catch (std::exception& e) {\n        std::cerr << e.what() << std::endl;\n    }\n}\n

    Output:

    [json.exception.parse_error.101] parse error: attempting to parse an empty input; check that your input string or stream contains the expected JSON\n
    "},{"location":"features/assertions/#see-also","title":"See also","text":"
    • JSON_ASSERT - control behavior of runtime assertions
    "},{"location":"features/binary_values/","title":"Binary Values","text":"

    The library implements several binary formats that encode JSON in an efficient way. Most of these formats support binary values; that is, values that have semantics defined outside the library and only define a sequence of bytes to be stored.

    JSON itself does not have a binary value. As such, binary values are an extension that this library implements to store values received by a binary format. Binary values are never created by the JSON parser and are only part of a serialized JSON text if they have been created manually or via a binary format.

    "},{"location":"features/binary_values/#api-for-binary-values","title":"API for binary values","text":"
    classDiagram\n\nclass binary_t [\"json::binary_t\"] {\n    +void set_subtype(std::uint64_t subtype)\n    +void clear_subtype()\n    +std::uint64_t subtype() const\n    +bool has_subtype() const\n}\n\nclass vector [\"std::vector<uint8_t>\"]\n\nvector <|-- binary_t

    By default, binary values are stored as std::vector<std::uint8_t>. This type can be changed by providing a template parameter to the basic_json type. To store binary subtypes, the storage type is extended and exposed as json::binary_t:

    auto binary = json::binary_t({0xCA, 0xFE, 0xBA, 0xBE});\nauto binary_with_subtype = json::binary_t({0xCA, 0xFE, 0xBA, 0xBE}, 42);\n

    There are several convenience functions to check and set the subtype:

    binary.has_subtype();                   // returns false\nbinary_with_subtype.has_subtype();      // returns true\n\nbinary_with_subtype.clear_subtype();\nbinary_with_subtype.has_subtype();      // returns true\n\nbinary_with_subtype.set_subtype(42);\nbinary.set_subtype(23);\n\nbinary.subtype();                       // returns 23\n

    As json::binary_t is subclassing std::vector<std::uint8_t>, all member functions are available:

    binary.size();  // returns 4\nbinary[1];      // returns 0xFE\n

    JSON values can be constructed from json::binary_t:

    json j = binary;\n

    Binary values are primitive values just like numbers or strings:

    j.is_binary();    // returns true\nj.is_primitive(); // returns true\n

    Given a binary JSON value, the binary_t can be accessed by reference as via get_binary():

    j.get_binary().has_subtype();  // returns true\nj.get_binary().size();         // returns 4\n

    For convenience, binary JSON values can be constructed via json::binary:

    auto j2 = json::binary({0xCA, 0xFE, 0xBA, 0xBE}, 23);\nauto j3 = json::binary({0xCA, 0xFE, 0xBA, 0xBE});\n\nj2 == j;                        // returns true\nj3.get_binary().has_subtype();  // returns false\nj3.get_binary().subtype();      // returns std::uint64_t(-1) as j3 has no subtype\n
    "},{"location":"features/binary_values/#serialization","title":"Serialization","text":"

    Binary values are serialized differently according to the formats.

    "},{"location":"features/binary_values/#json","title":"JSON","text":"

    JSON does not have a binary type, and this library does not introduce a new type as this would break conformance. Instead, binary values are serialized as an object with two keys: bytes holds an array of integers, and subtype is an integer or null.

    Example

    Code:

    // create a binary value of subtype 42\njson j;\nj[\"binary\"] = json::binary({0xCA, 0xFE, 0xBA, 0xBE}, 42);\n\n// serialize to standard output\nstd::cout << j.dump(2) << std::endl;\n

    Output:

    {\n  \"binary\": {\n    \"bytes\": [202, 254, 186, 190],\n    \"subtype\": 42\n  }\n}\n

    No roundtrip for binary values

    The JSON parser will not parse the objects generated by binary values back to binary values. This is by design to remain standards compliant. Serializing binary values to JSON is only implemented for debugging purposes.

    "},{"location":"features/binary_values/#bjdata","title":"BJData","text":"

    BJData neither supports binary values nor subtypes and proposes to serialize binary values as an array of uint8 values. The library implements this translation.

    Example

    Code:

    // create a binary value of subtype 42 (will be ignored in BJData)\njson j;\nj[\"binary\"] = json::binary({0xCA, 0xFE, 0xBA, 0xBE}, 42);\n\n// convert to BJData\nauto v = json::to_bjdata(j);      \n

    v is a std::vector<std::uint8t> with the following 20 elements:

    0x7B                                             // '{'\n    0x69 0x06                                    // i 6 (length of the key)\n    0x62 0x69 0x6E 0x61 0x72 0x79                // \"binary\"\n    0x5B                                         // '['\n        0x55 0xCA 0x55 0xFE 0x55 0xBA 0x55 0xBE  // content (each byte prefixed with 'U')\n    0x5D                                         // ']'\n0x7D                                             // '}'\n

    The following code uses the type and size optimization for UBJSON:

    // convert to UBJSON using the size and type optimization\nauto v = json::to_bjdata(j, true, true);\n

    The resulting vector has 22 elements; the optimization is not effective for examples with few values:

    0x7B                                // '{'\n    0x23 0x69 0x01                  // '#' 'i' type of the array elements: unsigned integers\n    0x69 0x06                       // i 6 (length of the key)\n    0x62 0x69 0x6E 0x61 0x72 0x79   // \"binary\"\n    0x5B                            // '[' array\n        0x24 0x55                   // '$' 'U' type of the array elements: unsigned integers\n        0x23 0x69 0x04              // '#' i 4 number of array elements\n        0xCA 0xFE 0xBA 0xBE         // content\n

    Note that subtype (42) is not serialized and that UBJSON has no binary type, and deserializing v would yield the following value:

    {\n  \"binary\": [202, 254, 186, 190]\n}\n
    "},{"location":"features/binary_values/#bson","title":"BSON","text":"

    BSON supports binary values and subtypes. If a subtype is given, it is used and added as an unsigned 8-bit integer. If no subtype is given, the generic binary subtype 0x00 is used.

    Example

    Code:

    // create a binary value of subtype 42\njson j;\nj[\"binary\"] = json::binary({0xCA, 0xFE, 0xBA, 0xBE}, 42);\n\n// convert to BSON\nauto v = json::to_bson(j);      \n

    v is a std::vector<std::uint8t> with the following 22 elements:

    0x16 0x00 0x00 0x00                         // number of bytes in the document\n    0x05                                    // binary value\n        0x62 0x69 0x6E 0x61 0x72 0x79 0x00  // key \"binary\" + null byte\n        0x04 0x00 0x00 0x00                 // number of bytes\n        0x2a                                // subtype\n        0xCA 0xFE 0xBA 0xBE                 // content\n0x00                                        // end of the document\n

    Note that the serialization preserves the subtype, and deserializing v would yield the following value:

    {\n  \"binary\": {\n    \"bytes\": [202, 254, 186, 190],\n    \"subtype\": 42\n  }\n}\n
    "},{"location":"features/binary_values/#cbor","title":"CBOR","text":"

    CBOR supports binary values, but no subtypes. Subtypes will be serialized as tags. Any binary value will be serialized as byte strings. The library will choose the smallest representation using the length of the byte array.

    Example

    Code:

    // create a binary value of subtype 42\njson j;\nj[\"binary\"] = json::binary({0xCA, 0xFE, 0xBA, 0xBE}, 42);\n\n// convert to CBOR\nauto v = json::to_cbor(j);      \n

    v is a std::vector<std::uint8t> with the following 15 elements:

    0xA1                                   // map(1)\n    0x66                               // text(6)\n        0x62 0x69 0x6E 0x61 0x72 0x79  // \"binary\"\n    0xD8 0x2A                          // tag(42)\n    0x44                               // bytes(4)\n        0xCA 0xFE 0xBA 0xBE            // content\n

    Note that the subtype is serialized as tag. However, parsing tagged values yield a parse error unless json::cbor_tag_handler_t::ignore or json::cbor_tag_handler_t::store is passed to json::from_cbor.

    {\n  \"binary\": {\n    \"bytes\": [202, 254, 186, 190],\n    \"subtype\": null\n  }\n}\n
    "},{"location":"features/binary_values/#messagepack","title":"MessagePack","text":"

    MessagePack supports binary values and subtypes. If a subtype is given, the ext family is used. The library will choose the smallest representation among fixext1, fixext2, fixext4, fixext8, ext8, ext16, and ext32. The subtype is then added as a signed 8-bit integer.

    If no subtype is given, the bin family (bin8, bin16, bin32) is used.

    Example

    Code:

    // create a binary value of subtype 42\njson j;\nj[\"binary\"] = json::binary({0xCA, 0xFE, 0xBA, 0xBE}, 42);\n\n// convert to MessagePack\nauto v = json::to_msgpack(j);      \n

    v is a std::vector<std::uint8t> with the following 14 elements:

    0x81                                   // fixmap1\n    0xA6                               // fixstr6\n        0x62 0x69 0x6E 0x61 0x72 0x79  // \"binary\"\n    0xD6                               // fixext4\n        0x2A                           // subtype\n        0xCA 0xFE 0xBA 0xBE            // content\n

    Note that the serialization preserves the subtype, and deserializing v would yield the following value:

    {\n  \"binary\": {\n    \"bytes\": [202, 254, 186, 190],\n    \"subtype\": 42\n  }\n}\n
    "},{"location":"features/binary_values/#ubjson","title":"UBJSON","text":"

    UBJSON neither supports binary values nor subtypes and proposes to serialize binary values as an array of uint8 values. The library implements this translation.

    Example

    Code:

    // create a binary value of subtype 42 (will be ignored in UBJSON)\njson j;\nj[\"binary\"] = json::binary({0xCA, 0xFE, 0xBA, 0xBE}, 42);\n\n// convert to UBJSON\nauto v = json::to_ubjson(j);      \n

    v is a std::vector<std::uint8t> with the following 20 elements:

    0x7B                                             // '{'\n    0x69 0x06                                    // i 6 (length of the key)\n    0x62 0x69 0x6E 0x61 0x72 0x79                // \"binary\"\n    0x5B                                         // '['\n        0x55 0xCA 0x55 0xFE 0x55 0xBA 0x55 0xBE  // content (each byte prefixed with 'U')\n    0x5D                                         // ']'\n0x7D                                             // '}'\n

    The following code uses the type and size optimization for UBJSON:

    // convert to UBJSON using the size and type optimization\nauto v = json::to_ubjson(j, true, true);\n

    The resulting vector has 23 elements; the optimization is not effective for examples with few values:

    0x7B                                // '{'\n    0x24                            // '$' type of the object elements\n    0x5B                            // '[' array\n    0x23 0x69 0x01                  // '#' i 1 number of object elements\n    0x69 0x06                       // i 6 (length of the key)\n    0x62 0x69 0x6E 0x61 0x72 0x79   // \"binary\"\n        0x24 0x55                   // '$' 'U' type of the array elements: unsigned integers\n        0x23 0x69 0x04              // '#' i 4 number of array elements\n        0xCA 0xFE 0xBA 0xBE         // content\n

    Note that subtype (42) is not serialized and that UBJSON has no binary type, and deserializing v would yield the following value:

    {\n  \"binary\": [202, 254, 186, 190]\n}\n
    "},{"location":"features/comments/","title":"Comments","text":"

    This library does not support comments by default. It does so for three reasons:

    1. Comments are not part of the JSON specification. You may argue that // or /* */ are allowed in JavaScript, but JSON is not JavaScript.

    2. This was not an oversight: Douglas Crockford wrote on this in May 2012:

      I removed comments from JSON because I saw people were using them to hold parsing directives, a practice which would have destroyed interoperability. I know that the lack of comments makes some people sad, but it shouldn't.

      Suppose you are using JSON to keep configuration files, which you would like to annotate. Go ahead and insert all the comments you like. Then pipe it through JSMin before handing it to your JSON parser.

    3. It is dangerous for interoperability if some libraries add comment support while others do not. Please check The Harmful Consequences of the Robustness Principle on this.

    However, you can set parameter ignore_comments to true in the parse function to ignore // or /* */ comments. Comments will then be treated as whitespace.

    For more information, see JSON With Commas and Comments (JWCC).

    Example

    Consider the following JSON with comments.

    {\n    // update in 2006: removed Pluto\n    \"planets\": [\"Mercury\", \"Venus\", \"Earth\", \"Mars\",\n                \"Jupiter\", \"Uranus\", \"Neptune\" /*, \"Pluto\" */]\n}\n

    When calling parse without additional argument, a parse error exception is thrown. If ignore_comments is set to true, the comments are ignored during parsing:

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    std::string s = R\"(\n    {\n        // update in 2006: removed Pluto\n        \"planets\": [\"Mercury\", \"Venus\", \"Earth\", \"Mars\",\n                    \"Jupiter\", \"Uranus\", \"Neptune\" /*, \"Pluto\" */]\n    }\n    )\";\n\n    try\n    {\n        json j = json::parse(s);\n    }\n    catch (json::exception& e)\n    {\n        std::cout << e.what() << std::endl;\n    }\n\n    json j = json::parse(s,\n                         /* callback */ nullptr,\n                         /* allow exceptions */ true,\n                         /* ignore_comments */ true);\n    std::cout << j.dump(2) << '\\n';\n}\n

    Output:

    [json.exception.parse_error.101] parse error at line 3, column 9: syntax error while parsing object key - invalid literal; last read: '<U+000A>    {<U+000A>        /'; expected string literal\n{\n  \"planets\": [\n    \"Mercury\",\n    \"Venus\",\n    \"Earth\",\n    \"Mars\",\n    \"Jupiter\",\n    \"Uranus\",\n    \"Neptune\"\n  ]\n}\n
    "},{"location":"features/enum_conversion/","title":"Specializing enum conversion","text":"

    By default, enum values are serialized to JSON as integers. In some cases, this could result in undesired behavior. If the integer values of any enum values are changed after data using those enum values has been serialized to JSON, then deserializing that JSON would result in a different enum value being restored, or the value not being found at all.

    It is possible to more precisely specify how a given enum is mapped to and from JSON as shown below:

    // example enum type declaration\nenum TaskState {\n    TS_STOPPED,\n    TS_RUNNING,\n    TS_COMPLETED,\n    TS_INVALID=-1,\n};\n\n// map TaskState values to JSON as strings\nNLOHMANN_JSON_SERIALIZE_ENUM( TaskState, {\n    {TS_INVALID, nullptr},\n    {TS_STOPPED, \"stopped\"},\n    {TS_RUNNING, \"running\"},\n    {TS_COMPLETED, \"completed\"},\n})\n

    The NLOHMANN_JSON_SERIALIZE_ENUM() macro declares a set of to_json() / from_json() functions for type TaskState while avoiding repetition and boilerplate serialization code.

    "},{"location":"features/enum_conversion/#usage","title":"Usage","text":"
    // enum to JSON as string\njson j = TS_STOPPED;\nassert(j == \"stopped\");\n\n// json string to enum\njson j3 = \"running\";\nassert(j3.template get<TaskState>() == TS_RUNNING);\n\n// undefined json value to enum (where the first map entry above is the default)\njson jPi = 3.14;\nassert(jPi.template get<TaskState>() == TS_INVALID );\n
    "},{"location":"features/enum_conversion/#notes","title":"Notes","text":"

    Just as in Arbitrary Type Conversions above,

    • NLOHMANN_JSON_SERIALIZE_ENUM() MUST be declared in your enum type's namespace (which can be the global namespace), or the library will not be able to locate it, and it will default to integer serialization.
    • It MUST be available (e.g., proper headers must be included) everywhere you use the conversions.

    Other Important points:

    • When using template get<ENUM_TYPE>(), undefined JSON values will default to the first pair specified in your map. Select this default pair carefully.
    • If an enum or JSON value is specified more than once in your map, the first matching occurrence from the top of the map will be returned when converting to or from JSON.
    • To disable the default serialization of enumerators as integers and force a compiler error instead, see JSON_DISABLE_ENUM_SERIALIZATION.
    "},{"location":"features/iterators/","title":"Iterators","text":""},{"location":"features/iterators/#overview","title":"Overview","text":"

    A basic_json value is a container and allows access via iterators. Depending on the value type, basic_json stores zero or more values.

    As for other containers, begin() returns an iterator to the first value and end() returns an iterator to the value following the last value. The latter iterator is a placeholder and cannot be dereferenced. In case of null values, empty arrays, or empty objects, begin() will return end().

    "},{"location":"features/iterators/#iteration-order-for-objects","title":"Iteration order for objects","text":"

    When iterating over objects, values are ordered with respect to the object_comparator_t type which defaults to std::less. See the types documentation for more information.

    Example 
    // create JSON object {\"one\": 1, \"two\": 2, \"three\": 3}\njson j;\nj[\"one\"] = 1;\nj[\"two\"] = 2;\nj[\"three\"] = 3;\n\nfor (auto it = j.begin(); it != j.end(); ++it)\n{\n    std::cout << *it << std::endl;\n}\n

    Output:

    1\n3\n2\n

    The reason for the order is the lexicographic ordering of the object keys \"one\", \"three\", \"two\".

    "},{"location":"features/iterators/#access-object-keys-during-iteration","title":"Access object keys during iteration","text":"

    The JSON iterators have two member functions, key() and value() to access the object key and stored value, respectively. When calling key() on a non-object iterator, an invalid_iterator.207 exception is thrown.

    Example 
    // create JSON object {\"one\": 1, \"two\": 2, \"three\": 3}\njson j;\nj[\"one\"] = 1;\nj[\"two\"] = 2;\nj[\"three\"] = 3;\n\nfor (auto it = j.begin(); it != j.end(); ++it)\n{\n    std::cout << it.key() << \" : \" << it.value() << std::endl;\n}\n

    Output:

    one : 1\nthree : 3\ntwo : 2\n
    "},{"location":"features/iterators/#range-based-for-loops","title":"Range-based for loops","text":"

    C++11 allows using range-based for loops to iterate over a container.

    for (auto it : j_object)\n{\n    // \"it\" is of type json::reference and has no key() member\n    std::cout << \"value: \" << it << '\\n';\n}\n

    For this reason, the items() function allows accessing iterator::key() and iterator::value() during range-based for loops. In these loops, a reference to the JSON values is returned, so there is no access to the underlying iterator.

    for (auto& el : j_object.items())\n{\n    std::cout << \"key: \" << el.key() << \", value:\" << el.value() << '\\n';\n}\n

    The items() function also allows using structured bindings (C++17):

    for (auto& [key, val] : j_object.items())\n{\n    std::cout << \"key: \" << key << \", value:\" << val << '\\n';\n}\n

    Note

    When iterating over an array, key() will return the index of the element as string. For primitive types (e.g., numbers), key() returns an empty string.

    Warning

    Using items() on temporary objects is dangerous. Make sure the object's lifetime exceeds the iteration. See #2040 for more information.

    "},{"location":"features/iterators/#reverse-iteration-order","title":"Reverse iteration order","text":"

    rbegin() and rend() return iterators in the reverse sequence.

    Example 
    json j = {1, 2, 3, 4};\n\nfor (auto it = j.rbegin(); it != j.rend(); ++it)\n{\n    std::cout << *it << std::endl;\n}\n

    Output:

    4\n3\n2\n1\n
    "},{"location":"features/iterators/#iterating-strings-and-binary-values","title":"Iterating strings and binary values","text":"

    Note that \"value\" means a JSON value in this setting, not values stored in the underlying containers. That is, *begin() returns the complete string or binary array and is also safe the underlying string or binary array is empty.

    Example 
    json j = \"Hello, world\";\nfor (auto it = j.begin(); it != j.end(); ++it)\n{\n    std::cout << *it << std::endl;\n}\n

    Output:

    \"Hello, world\"\n
    "},{"location":"features/iterators/#iterator-invalidation","title":"Iterator invalidation","text":"Operations invalidated iterators clear all"},{"location":"features/json_patch/","title":"JSON Patch and Diff","text":""},{"location":"features/json_patch/#patches","title":"Patches","text":"

    JSON Patch (RFC 6902) defines a JSON document structure for expressing a sequence of operations to apply to a JSON document. With the patch function, a JSON Patch is applied to the current JSON value by executing all operations from the patch.

    Example

    The following code shows how a JSON patch is applied to a value.

    #include <iostream>\n#include <iomanip>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\nusing namespace nlohmann::literals;\n\nint main()\n{\n    // the original document\n    json doc = R\"(\n        {\n          \"baz\": \"qux\",\n          \"foo\": \"bar\"\n        }\n    )\"_json;\n\n    // the patch\n    json patch = R\"(\n        [\n          { \"op\": \"replace\", \"path\": \"/baz\", \"value\": \"boo\" },\n          { \"op\": \"add\", \"path\": \"/hello\", \"value\": [\"world\"] },\n          { \"op\": \"remove\", \"path\": \"/foo\"}\n        ]\n    )\"_json;\n\n    // apply the patch\n    json patched_doc = doc.patch(patch);\n\n    // output original and patched document\n    std::cout << std::setw(4) << doc << \"\\n\\n\"\n              << std::setw(4) << patched_doc << std::endl;\n}\n

    Output:

    {\n    \"baz\": \"qux\",\n    \"foo\": \"bar\"\n}\n\n{\n    \"baz\": \"boo\",\n    \"hello\": [\n        \"world\"\n    ]\n}\n
    "},{"location":"features/json_patch/#diff","title":"Diff","text":"

    The library can also calculate a JSON patch (i.e., a diff) given two JSON values.

    Invariant

    For two JSON values source and target, the following code yields always true:

    source.patch(diff(source, target)) == target;\n
    Example

    The following code shows how a JSON patch is created as a diff for two JSON values.

    #include <iostream>\n#include <iomanip>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\nusing namespace nlohmann::literals;\n\nint main()\n{\n    // the source document\n    json source = R\"(\n        {\n            \"baz\": \"qux\",\n            \"foo\": \"bar\"\n        }\n    )\"_json;\n\n    // the target document\n    json target = R\"(\n        {\n            \"baz\": \"boo\",\n            \"hello\": [\n                \"world\"\n            ]\n        }\n    )\"_json;\n\n    // create the patch\n    json patch = json::diff(source, target);\n\n    // roundtrip\n    json patched_source = source.patch(patch);\n\n    // output patch and roundtrip result\n    std::cout << std::setw(4) << patch << \"\\n\\n\"\n              << std::setw(4) << patched_source << std::endl;\n}\n

    Output:

    [\n    {\n        \"op\": \"replace\",\n        \"path\": \"/baz\",\n        \"value\": \"boo\"\n    },\n    {\n        \"op\": \"remove\",\n        \"path\": \"/foo\"\n    },\n    {\n        \"op\": \"add\",\n        \"path\": \"/hello\",\n        \"value\": [\n            \"world\"\n        ]\n    }\n]\n\n{\n    \"baz\": \"boo\",\n    \"hello\": [\n        \"world\"\n    ]\n}\n
    "},{"location":"features/json_pointer/","title":"JSON Pointer","text":""},{"location":"features/json_pointer/#introduction","title":"Introduction","text":"

    The library supports JSON Pointer (RFC 6901) as an alternative means to address structured values. A JSON Pointer is a string that identifies a specific value within a JSON document.

    Consider the following JSON document

    {\n    \"array\": [\"A\", \"B\", \"C\"],\n    \"nested\": {\n        \"one\": 1,\n        \"two\": 2,\n        \"three\": [true, false]\n    }\n}\n

    Then every value inside the JSON document can be identified as follows:

    JSON Pointer JSON value `` {\"array\":[\"A\",\"B\",\"C\"],\"nested\":{\"one\":1,\"two\":2,\"three\":[true,false]}} /array [\"A\",\"B\",\"C\"] /array/0 A /array/1 B /array/2 C /nested {\"one\":1,\"two\":2,\"three\":[true,false]} /nested/one 1 /nested/two 2 /nested/three [true,false] /nested/three/0 true /nested/three/1 false

    Note / does not identify the root (i.e., the whole document), but an object entry with empty key \"\". See RFC 6901 for more information.

    "},{"location":"features/json_pointer/#json-pointer-creation","title":"JSON Pointer creation","text":"

    JSON Pointers can be created from a string:

    json::json_pointer p(\"/nested/one\");\n

    Furthermore, a user-defined string literal can be used to achieve the same result:

    auto p = \"/nested/one\"_json_pointer;\n

    The escaping rules of RFC 6901 are implemented. See the constructor documentation for more information.

    "},{"location":"features/json_pointer/#value-access","title":"Value access","text":"

    JSON Pointers can be used in the at, operator[], and value functions just like object keys or array indices.

    // the JSON value from above\nauto j = json::parse(R\"({\n    \"array\": [\"A\", \"B\", \"C\"],\n    \"nested\": {\n        \"one\": 1,\n        \"two\": 2,\n        \"three\": [true, false]\n    }\n})\");\n\n// access values\nauto val = j[\"\"_json_pointer];                              // {\"array\":[\"A\",\"B\",\"C\"],...}\nauto val1 = j[\"/nested/one\"_json_pointer];                  // 1\nauto val2 = j.at(json::json_pointer(\"/nested/three/1\"));    // false\nauto val3 = j.value(json::json_pointer(\"/nested/four\"), 0); // 0\n
    "},{"location":"features/json_pointer/#flatten-unflatten","title":"Flatten / unflatten","text":"

    The library implements a function flatten to convert any JSON document into a JSON object where each key is a JSON Pointer and each value is a primitive JSON value (i.e., a string, boolean, number, or null).

    // the JSON value from above\nauto j = json::parse(R\"({\n    \"array\": [\"A\", \"B\", \"C\"],\n    \"nested\": {\n        \"one\": 1,\n        \"two\": 2,\n        \"three\": [true, false]\n    }\n})\");\n\n// create flattened value\nauto j_flat = j.flatten();\n

    The resulting value j_flat is:

    {\n  \"/array/0\": \"A\",\n  \"/array/1\": \"B\",\n  \"/array/2\": \"C\",\n  \"/nested/one\": 1,\n  \"/nested/two\": 2,\n  \"/nested/three/0\": true,\n  \"/nested/three/1\": false\n}\n

    The reverse function, unflatten recreates the original value.

    auto j_original = j_flat.unflatten();\n
    "},{"location":"features/json_pointer/#see-also","title":"See also","text":"
    • Class json_pointer
    • Function flatten
    • Function unflatten
    • JSON Patch
    "},{"location":"features/macros/","title":"Supported Macros","text":"

    Some aspects of the library can be configured by defining preprocessor macros before including the json.hpp header. See also the API documentation for macros for examples and more information.

    "},{"location":"features/macros/#json_assertx","title":"JSON_ASSERT(x)","text":"

    This macro controls which code is executed for runtime assertions of the library.

    See full documentation of JSON_ASSERT(x).

    "},{"location":"features/macros/#json_catch_userexception","title":"JSON_CATCH_USER(exception)","text":"

    This macro overrides catch calls inside the library.

    See full documentation of JSON_CATCH_USER(exception).

    "},{"location":"features/macros/#json_diagnostics","title":"JSON_DIAGNOSTICS","text":"

    This macro enables extended diagnostics for exception messages. Possible values are 1 to enable or 0 to disable (default).

    When enabled, exception messages contain a JSON Pointer to the JSON value that triggered the exception, see Extended diagnostic messages for an example. Note that enabling this macro increases the size of every JSON value by one pointer and adds some runtime overhead.

    The diagnostics messages can also be controlled with the CMake option JSON_Diagnostics (OFF by default) which sets JSON_DIAGNOSTICS accordingly.

    See full documentation of JSON_DIAGNOSTICS.

    "},{"location":"features/macros/#json_diagnostic_positions","title":"JSON_DIAGNOSTIC_POSITIONS","text":"

    When enabled, two new member functions start_pos() and end_pos() are added to basic_json values. If the value was created by calling theparse function, then these functions allow querying the byte positions of the value in the input it was parsed from. The byte positions are also used in exceptions to help locate errors.

    The diagnostics positions can also be controlled with the CMake option JSON_Diagnostic_Positions (OFF by default) which sets JSON_DIAGNOSTIC_POSITIONS accordingly.

    See full documentation of JSON_DIAGNOSTIC_POSITIONS

    "},{"location":"features/macros/#json_has_cpp_11-json_has_cpp_14-json_has_cpp_17-json_has_cpp_20","title":"JSON_HAS_CPP_11, JSON_HAS_CPP_14, JSON_HAS_CPP_17, JSON_HAS_CPP_20","text":"

    The library targets C++11, but also supports some features introduced in later C++ versions (e.g., std::string_view support for C++17). For these new features, the library implements some preprocessor checks to determine the C++ standard. By defining any of these symbols, the internal check is overridden and the provided C++ version is unconditionally assumed. This can be helpful for compilers that only implement parts of the standard and would be detected incorrectly.

    See full documentation of JSON_HAS_CPP_11, JSON_HAS_CPP_14, JSON_HAS_CPP_17, and JSON_HAS_CPP_20.

    "},{"location":"features/macros/#json_has_filesystem-json_has_experimental_filesystem","title":"JSON_HAS_FILESYSTEM, JSON_HAS_EXPERIMENTAL_FILESYSTEM","text":"

    When compiling with C++17, the library provides conversions from and to std::filesystem::path. As compiler support for filesystem is limited, the library tries to detect whether <filesystem>/std::filesystem (JSON_HAS_FILESYSTEM) or <experimental/filesystem>/std::experimental::filesystem (JSON_HAS_EXPERIMENTAL_FILESYSTEM) should be used. To override the built-in check, define JSON_HAS_FILESYSTEM or JSON_HAS_EXPERIMENTAL_FILESYSTEM to 1.

    See full documentation of JSON_HAS_FILESYSTEM and JSON_HAS_EXPERIMENTAL_FILESYSTEM.

    "},{"location":"features/macros/#json_noexception","title":"JSON_NOEXCEPTION","text":"

    Exceptions can be switched off by defining the symbol JSON_NOEXCEPTION.

    See full documentation of JSON_NOEXCEPTION.

    "},{"location":"features/macros/#json_disable_enum_serialization","title":"JSON_DISABLE_ENUM_SERIALIZATION","text":"

    When defined, default parse and serialize functions for enums are excluded and have to be provided by the user, for example, using NLOHMANN_JSON_SERIALIZE_ENUM.

    See full documentation of JSON_DISABLE_ENUM_SERIALIZATION.

    "},{"location":"features/macros/#json_no_io","title":"JSON_NO_IO","text":"

    When defined, headers <cstdio>, <ios>, <iosfwd>, <istream>, and <ostream> are not included and parse functions relying on these headers are excluded. This is relevant for environment where these I/O functions are disallowed for security reasons (e.g., Intel Software Guard Extensions (SGX)).

    See full documentation of JSON_NO_IO.

    "},{"location":"features/macros/#json_skip_library_version_check","title":"JSON_SKIP_LIBRARY_VERSION_CHECK","text":"

    When defined, the library will not create a compiler warning when a different version of the library was already included.

    See full documentation of JSON_SKIP_LIBRARY_VERSION_CHECK.

    "},{"location":"features/macros/#json_skip_unsupported_compiler_check","title":"JSON_SKIP_UNSUPPORTED_COMPILER_CHECK","text":"

    When defined, the library will not create a compile error when a known unsupported compiler is detected. This allows using the library with compilers that do not fully support C++11 and may only work if unsupported features are not used.

    See full documentation of JSON_SKIP_UNSUPPORTED_COMPILER_CHECK.

    "},{"location":"features/macros/#json_throw_userexception","title":"JSON_THROW_USER(exception)","text":"

    This macro overrides throw calls inside the library. The argument is the exception to be thrown.

    See full documentation of JSON_THROW_USER(exception).

    "},{"location":"features/macros/#json_try_user","title":"JSON_TRY_USER","text":"

    This macro overrides try calls inside the library.

    See full documentation of JSON_TRY_USER.

    "},{"location":"features/macros/#json_use_implicit_conversions","title":"JSON_USE_IMPLICIT_CONVERSIONS","text":"

    When defined to 0, implicit conversions are switched off. By default, implicit conversions are switched on.

    See full documentation of JSON_USE_IMPLICIT_CONVERSIONS.

    "},{"location":"features/macros/#nlohmann_define_type_-nlohmann_define_derived_type_","title":"NLOHMANN_DEFINE_TYPE_*(...), NLOHMANN_DEFINE_DERIVED_TYPE_*(...)","text":"

    The library defines 12 macros to simplify the serialization/deserialization of types. See the page on arbitrary type conversion for a detailed discussion.

    "},{"location":"features/macros/#nlohmann_json_serialize_enumtype","title":"NLOHMANN_JSON_SERIALIZE_ENUM(type, ...)","text":"

    This macro simplifies the serialization/deserialization of enum types. See Specializing enum conversion for more information.

    See full documentation of NLOHMANN_JSON_SERIALIZE_ENUM.

    "},{"location":"features/macros/#nlohmann_json_version_major-nlohmann_json_version_minor-nlohmann_json_version_patch","title":"NLOHMANN_JSON_VERSION_MAJOR, NLOHMANN_JSON_VERSION_MINOR, NLOHMANN_JSON_VERSION_PATCH","text":"

    These macros are defined by the library and contain the version numbers according to Semantic Versioning 2.0.0.

    See full documentation of NLOHMANN_JSON_VERSION_MAJOR, NLOHMANN_JSON_VERSION_MINOR, and NLOHMANN_JSON_VERSION_PATCH.

    "},{"location":"features/merge_patch/","title":"JSON Merge Patch","text":"

    The library supports JSON Merge Patch (RFC 7386) as a patch format. The merge patch format is primarily intended for use with the HTTP PATCH method as a means of describing a set of modifications to a target resource's content. This function applies a merge patch to the current JSON value.

    Instead of using JSON Pointer to specify values to be manipulated, it describes the changes using a syntax that closely mimics the document being modified.

    Example

    The following code shows how a JSON Merge Patch is applied to a JSON document.

    #include <iostream>\n#include <nlohmann/json.hpp>\n#include <iomanip> // for std::setw\n\nusing json = nlohmann::json;\nusing namespace nlohmann::literals;\n\nint main()\n{\n    // the original document\n    json document = R\"({\n                \"title\": \"Goodbye!\",\n                \"author\": {\n                    \"givenName\": \"John\",\n                    \"familyName\": \"Doe\"\n                },\n                \"tags\": [\n                    \"example\",\n                    \"sample\"\n                ],\n                \"content\": \"This will be unchanged\"\n            })\"_json;\n\n    // the patch\n    json patch = R\"({\n                \"title\": \"Hello!\",\n                \"phoneNumber\": \"+01-123-456-7890\",\n                \"author\": {\n                    \"familyName\": null\n                },\n                \"tags\": [\n                    \"example\"\n                ]\n            })\"_json;\n\n    // apply the patch\n    document.merge_patch(patch);\n\n    // output original and patched document\n    std::cout << std::setw(4) << document << std::endl;\n}\n

    Output:

    {\n    \"author\": {\n        \"givenName\": \"John\"\n    },\n    \"content\": \"This will be unchanged\",\n    \"phoneNumber\": \"+01-123-456-7890\",\n    \"tags\": [\n        \"example\"\n    ],\n    \"title\": \"Hello!\"\n}\n
    "},{"location":"features/modules/","title":"Modules","text":"

    This library has experimental support for C++ modules, introduced in C++20. The library can be imported by writing import nlohmann.json; instead of #include <nlohmann/json.hpp>.

    Please be aware that the module is experimental and a full test is outstanding, and the exported symbols are subject to change.

    "},{"location":"features/modules/#requirements","title":"Requirements","text":"

    The nlohmann.json module requires that the build system is configured to build and resolve modules when imported. Obviously, as modules were introduced in C++20, this feature can only be used in C++20 and subsequent versions.

    To enable building the nlohmann.json module (which is not done by default), the macro NLOHMANN_JSON_BUILD_MODULES must be passed to the build system.

    "},{"location":"features/modules/#example","title":"Example","text":"

    When using modules rather than headers, the previous example for creating a json object through a JSON file, would instead be: 

    import std;\nimport nlohmann.json;\n\nusing json = nlohmann::json;\n\n// ...\n\nstd::ifstream f(\"example.json\");\njson data = json::parse(f);\n

    "},{"location":"features/modules/#modules-do-not-export-macros","title":"Modules do not export macros","text":"

    It should be noted that as modules do not export macros, the nlohmann.json module will not export any macros, but rather only the following symbols: - nlohmann::adl_serializer - nlohmann::basic_json - nlohmann::json - nlohmann::json_pointer - nlohmann::ordered_map - nlohmann::ordered_json

    "},{"location":"features/namespace/","title":"nlohmann Namespace","text":"

    The 3.11.0 release introduced an inline namespace to allow different parts of a codebase to safely use different versions of the JSON library as long as they never exchange instances of library types.

    "},{"location":"features/namespace/#structure","title":"Structure","text":"

    The complete default namespace name is derived as follows:

    • The root namespace is always nlohmann.
    • The inline namespace starts with json_abi and is followed by serveral optional ABI tags according to the value of these ABI-affecting macros, in order:
      • JSON_DIAGNOSTICS defined non-zero appends _diag.
      • JSON_USE_LEGACY_DISCARDED_VALUE_COMPARISON defined non-zero appends _ldvcmp.
    • The inline namespace ends with the suffix _v followed by the 3 components of the version number separated by underscores. To omit the version component, see Disabling the version component below.

    For example, the namespace name for version 3.11.2 with JSON_DIAGNOSTICS defined to 1 is:

    nlohmann::json_abi_diag_v3_11_2\n
    "},{"location":"features/namespace/#purpose","title":"Purpose","text":"

    Several incompatibilities have been observed. Amongst the most common ones is linking code compiled with different definitions of JSON_DIAGNOSTICS. This is illustrated in the diagram below.

    graph\n    json[\"<strong>nlohmann_json (v3.10.5)</strong><br>JSON_DIAGNOSTICS=0\"]\n    json_diag[\"<strong>nlohmann_json (v3.10.5)</strong><br>JSON_DIAGNOSTICS=1\"]\n    library[\"<strong>some library</strong>\"]\n    app[\"<strong>application</strong>\"]\n\n    library --> json\n    app --> json_diag\n    app --> library

    In releases prior to 3.11.0, mixing any version of the JSON library with different JSON_DIAGNOSTICS settings would result in a crashing application. If some_library never passes instances of JSON library types to the application, this scenario became safe in version 3.11.0 and above due to the inline namespace yielding distinct symbol names.

    "},{"location":"features/namespace/#limitations","title":"Limitations","text":"

    Neither the compiler nor the linker will issue as much as a warning when translation units \u2013 intended to be linked together and that include different versions and/or configurations of the JSON library \u2013 exchange and use library types.

    There is an exception when forward declarations are used (i.e., when including json_fwd.hpp) in which case the linker may complain about undefined references.

    "},{"location":"features/namespace/#disabling-the-version-component","title":"Disabling the version component","text":"

    Different versions are not necessarily ABI-incompatible, but the project does not actively track changes in the ABI and recommends that all parts of a codebase exchanging library types be built with the same version. Users can, at their own risk, disable the version component of the linline namespace, allowing different versions \u2013 but not configurations \u2013 to be used in cases where the linker would otherwise output undefined reference errors.

    To do so, define NLOHMANN_JSON_NAMESPACE_NO_VERSION to 1.

    This applies to version 3.11.2 and above only; versions 3.11.0 and 3.11.1 can apply the technique described in the next section to emulate the effect of the NLOHMANN_JSON_NAMESPACE_NO_VERSION macro.

    Use at your own risk

    Disabling the namespace version component and mixing ABI-incompatible versions will result in crashes or incorrect behavior. You have been warned!

    "},{"location":"features/namespace/#disabling-the-inline-namespace-completely","title":"Disabling the inline namespace completely","text":"

    When interoperability with code using a pre-3.11.0 version of the library is required, users can, at their own risk restore the old namespace layout by redefining NLOHMANN_JSON_NAMESPACE_BEGIN, NLOHMANN_JSON_NAMESPACE_END as follows:

    #define NLOHMANN_JSON_NAMESPACE_BEGIN  namespace nlohmann {\n#define NLOHMANN_JSON_NAMESPACE_END    }\n

    Use at your own risk

    Overriding the namespace and mixing ABI-incompatible versions will result in crashes or incorrect behavior. You have been warned!

    "},{"location":"features/namespace/#version-history","title":"Version history","text":"
    • Introduced inline namespace (json_v3_11_0[_abi-tag]*) in version 3.11.0.
    • Changed structure of inline namespace in version 3.11.2.
    "},{"location":"features/object_order/","title":"Object Order","text":"

    The JSON standard defines objects as \"an unordered collection of zero or more name/value pairs\". As such, an implementation does not need to preserve any specific order of object keys.

    "},{"location":"features/object_order/#default-behavior-sort-keys","title":"Default behavior: sort keys","text":"

    The default type nlohmann::json uses a std::map to store JSON objects, and thus stores object keys sorted alphabetically.

    Example 
    #include <iostream>\n#include \"json.hpp\"\n\nusing json = nlohmann::json;\n\nint main()\n{\n    json j;\n    j[\"one\"] = 1;\n    j[\"two\"] = 2;\n    j[\"three\"] = 3;\n\n    std::cout << j.dump(2) << '\\n';\n}\n

    Output:

    {\n  \"one\": 1,\n  \"three\": 3,\n  \"two\": 2\n}\n
    "},{"location":"features/object_order/#alternative-behavior-preserve-insertion-order","title":"Alternative behavior: preserve insertion order","text":"

    If you do want to preserve the insertion order, you can try the type nlohmann::ordered_json.

    Example 
    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing ordered_json = nlohmann::ordered_json;\n\nint main()\n{\n    ordered_json j;\n    j[\"one\"] = 1;\n    j[\"two\"] = 2;\n    j[\"three\"] = 3;\n\n    std::cout << j.dump(2) << '\\n';\n}\n

    Output:

    {\n  \"one\": 1,\n  \"two\": 2,\n  \"three\": 3\n}\n

    Alternatively, you can use a more sophisticated ordered map like tsl::ordered_map (integration) or nlohmann::fifo_map (integration).

    "},{"location":"features/object_order/#notes-on-parsing","title":"Notes on parsing","text":"

    Note that you also need to call the right parse function when reading from a file. Assume file input.json contains the JSON object above:

    {\n  \"one\": 1,\n  \"two\": 2,\n  \"three\": 3\n}\n

    Right way

    The following code correctly calls the parse function from nlohmann::ordered_json:

    std::ifstream i(\"input.json\");\nauto j = nlohmann::ordered_json::parse(i);\nstd::cout << j.dump(2) << std::endl;\n

    The output will be:

    {\n  \"one\": 1,\n  \"two\": 2,\n  \"three\": 3\n}\n
    Wrong way

    The following code incorrectly calls the parse function from nlohmann::json which does not preserve the insertion order, but sorts object keys. Assigning the result to nlohmann::ordered_json compiles, but does not restore the order from the input file.

    std::ifstream i(\"input.json\");\nnlohmann::ordered_json j = nlohmann::json::parse(i);\nstd::cout << j.dump(2) << std::endl;\n

    The output will be:

    {\n  \"one\": 1,\n  \"three\": 3\n  \"two\": 2,\n}\n
    "},{"location":"features/trailing_commas/","title":"Trailing Commas","text":"

    Like comments, this library does not support trailing commas in arrays and objects by default.

    You can set parameter ignore_trailing_commas to true in the parse function to allow trailing commas in arrays and objects. Note that a single comma as the only content of the array or object ([,] or {,}) is not allowed, and multiple trailing commas ([1,,]) are not allowed either.

    This library does not add trailing commas when serializing JSON data.

    For more information, see JSON With Commas and Comments (JWCC).

    Example

    Consider the following JSON with trailing commas.

    {\n    \"planets\": [\n        \"Mercury\",\n        \"Venus\",\n        \"Earth\",\n        \"Mars\",\n        \"Jupiter\",\n        \"Uranus\",\n        \"Neptune\",\n    ]\n}\n

    When calling parse without additional argument, a parse error exception is thrown. If ignore_trailing_commas is set to true, the trailing commas are ignored during parsing:

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    std::string s = R\"(\n    {\n        \"planets\": [\n            \"Mercury\",\n            \"Venus\",\n            \"Earth\",\n            \"Mars\",\n            \"Jupiter\",\n            \"Uranus\",\n            \"Neptune\",\n        ]\n    }\n    )\";\n\n    try\n    {\n        json j = json::parse(s);\n    }\n    catch (json::exception& e)\n    {\n        std::cout << e.what() << std::endl;\n    }\n\n    json j = json::parse(s,\n                         /* callback */ nullptr,\n                         /* allow exceptions */ true,\n                         /* ignore_comments */ false,\n                         /* ignore_trailing_commas */ true);\n    std::cout << j.dump(2) << '\\n';\n}\n

    Output:

    [json.exception.parse_error.101] parse error at line 11, column 9: syntax error while parsing value - unexpected ']'; expected '[', '{', or a literal\n{\n  \"planets\": [\n    \"Mercury\",\n    \"Venus\",\n    \"Earth\",\n    \"Mars\",\n    \"Jupiter\",\n    \"Uranus\",\n    \"Neptune\"\n  ]\n}\n
    "},{"location":"features/binary_formats/","title":"Binary Formats","text":"

    Though JSON is a ubiquitous data format, it is not a very compact format suitable for data exchange, for instance, over a network. Hence, the library supports

    • BJData (Binary JData),
    • BSON (Binary JSON),
    • CBOR (Concise Binary Object Representation),
    • MessagePack, and
    • UBJSON (Universal Binary JSON)

    to efficiently encode JSON values to byte vectors and to decode such vectors.

    "},{"location":"features/binary_formats/#comparison","title":"Comparison","text":""},{"location":"features/binary_formats/#completeness","title":"Completeness","text":"Format Serialization Deserialization BJData complete complete BSON incomplete: top-level value must be an object incomplete, but all JSON types are supported CBOR complete incomplete, but all JSON types are supported MessagePack complete complete UBJSON complete complete"},{"location":"features/binary_formats/#binary-values","title":"Binary values","text":"Format Binary values Binary subtypes BJData not supported not supported BSON supported supported CBOR supported supported MessagePack supported supported UBJSON not supported not supported

    See binary values for more information.

    "},{"location":"features/binary_formats/#sizes","title":"Sizes","text":"Format canada.json twitter.json citm_catalog.json jeopardy.json BJData 53.2 % 91.1 % 78.1 % 96.6 % BJData (size) 58.6 % 92.1 % 86.7 % 97.4 % BJData (size+tyoe) 58.6 % 92.1 % 86.5 % 97.4 % BSON 85.8 % 95.2 % 95.8 % 106.7 % CBOR 50.5 % 86.3 % 68.4 % 88.0 % MessagePack 50.5 % 86.0 % 68.5 % 87.9 % UBJSON 53.2 % 91.3 % 78.2 % 96.6 % UBJSON (size) 58.6 % 92.3 % 86.8 % 97.4 % UBJSON (size+type) 55.9 % 92.3 % 85.0 % 95.0 %

    Sizes compared to minified JSON value.

    "},{"location":"features/binary_formats/bjdata/","title":"BJData","text":"

    The BJData format was derived from and improved upon Universal Binary JSON(UBJSON) specification (Draft 12). Specifically, it introduces an optimized array container for efficient storage of N-dimensional packed arrays (ND-arrays); it also adds 5 new type markers - [u] - uint16, [m] - uint32, [M] - uint64, [h] - float16 and [B] - byte - to unambiguously map common binary numeric types; furthermore, it uses little-endian (LE) to store all numerics instead of big-endian (BE) as in UBJSON to avoid unnecessary conversions on commonly available platforms.

    Compared to other binary JSON-like formats such as MessagePack and CBOR, both BJData and UBJSON demonstrate a rare combination of being both binary and quasi-human-readable. This is because all semantic elements in BJData and UBJSON, including the data-type markers and name/string types, are directly human-readable. Data stored in the BJData/UBJSON format is not only compact in size, fast to read/write, but also can be directly searched or read using simple processing.

    References

    • BJData Specification
    "},{"location":"features/binary_formats/bjdata/#serialization","title":"Serialization","text":"

    The library uses the following mapping from JSON values types to BJData types according to the BJData specification:

    JSON value type value/range BJData type marker null null null Z boolean true true T boolean false false F number_integer -9223372036854775808..-2147483649 int64 L number_integer -2147483648..-32769 int32 l number_integer -32768..-129 int16 I number_integer -128..127 int8 i number_integer 128..255 uint8 U number_integer 256..32767 int16 I number_integer 32768..65535 uint16 u number_integer 65536..2147483647 int32 l number_integer 2147483648..4294967295 uint32 m number_integer 4294967296..9223372036854775807 int64 L number_integer 9223372036854775808..18446744073709551615 uint64 M number_unsigned 0..127 int8 i number_unsigned 128..255 uint8 U number_unsigned 256..32767 int16 I number_unsigned 32768..65535 uint16 u number_unsigned 65536..2147483647 int32 l number_unsigned 2147483648..4294967295 uint32 m number_unsigned 4294967296..9223372036854775807 int64 L number_unsigned 9223372036854775808..18446744073709551615 uint64 M number_float any value float64 D string with shortest length indicator string S array see notes on optimized format/ND-array array [ object see notes on optimized format map { binary see notes on binary values array [$B

    Complete mapping

    The mapping is complete in the sense that any JSON value type can be converted to a BJData value.

    Any BJData output created by to_bjdata can be successfully parsed by from_bjdata.

    Size constraints

    The following values can not be converted to a BJData value:

    • strings with more than 18446744073709551615 bytes, i.e., 2^{64}-1 bytes (theoretical)

    Unused BJData markers

    The following markers are not used in the conversion:

    • Z: no-op values are not created.
    • C: single-byte strings are serialized with S markers.

    NaN/infinity handling

    If NaN or Infinity are stored inside a JSON number, they are serialized properly. This behavior differs from the dump() function which serializes NaN or Infinity to null.

    Endianness

    A breaking difference between BJData and UBJSON is the endianness of numerical values. In BJData, all numerical data types (integers UiuImlML and floating-point values hdD) are stored in the little-endian (LE) byte order as opposed to big-endian as used by UBJSON. Adopting LE to store numeric records avoids unnecessary byte swapping on most modern computers where LE is used as the default byte order.

    Optimized formats

    Optimized formats for containers are supported via two parameters of to_bjdata:

    • Parameter use_size adds size information to the beginning of a container and removes the closing marker.
    • Parameter use_type further checks whether all elements of a container have the same type and adds the type marker to the beginning of the container. The use_type parameter must only be used together with use_size = true.

    Note that use_size = true alone may result in larger representations - the benefit of this parameter is that the receiving side is immediately informed of the number of elements in the container.

    ND-array optimized format

    BJData extends UBJSON's optimized array size marker to support ND-arrays of uniform numerical data types (referred to as packed arrays). For example, the 2-D uint8 integer array [[1,2],[3,4],[5,6]], stored as nested optimized array in UBJSON [ [$U#i2 1 2 [$U#i2 3 4 [$U#i2 5 6 ], can be further compressed in BJData to [$U#[$i#i2 2 3 1 2 3 4 5 6 or [$U#[i2 i3] 1 2 3 4 5 6.

    To maintain type and size information, ND-arrays are converted to JSON objects following the annotated array format (defined in the JData specification (Draft 3)), when parsed using from_bjdata. For example, the above 2-D uint8 array can be parsed and accessed as

    {\n    \"_ArrayType_\": \"uint8\",\n    \"_ArraySize_\": [2,3],\n    \"_ArrayData_\": [1,2,3,4,5,6]\n}\n

    Likewise, when a JSON object in the above form is serialzed using to_bjdata, it is automatically converted into a compact BJData ND-array. The only exception is, that when the 1-dimensional vector stored in \"_ArraySize_\" contains a single integer or two integers with one being 1, a regular 1-D optimized array is generated.

    The current version of this library does not yet support automatic detection of and conversion from a nested JSON array input to a BJData ND-array.

    Restrictions in optimized data types for arrays and objects

    Due to diminished space saving, hampered readability, and increased security risks, in BJData, the allowed data types following the $ marker in an optimized array and object container are restricted to non-zero-fixed-length data types. Therefore, the valid optimized type markers can only be one of UiuImlMLhdDCB. This also means other variable ([{SH) or zero-length types (TFN) can not be used in an optimized array or object in BJData.

    Binary values

    BJData provides a dedicated B marker (defined in the BJData specification (Draft 3)) that is used in optimized arrays to designate binary data. This means that, unlike UBJSON, binary data can be both serialized and deserialized.

    To preserve compatibility with BJData Draft 2, the Draft 3 optimized binary array must be explicitly enabled using the version parameter of to_bjdata.

    In Draft2 mode (default), if the JSON data contains the binary type, the value stored as a list of integers, as suggested by the BJData documentation. In particular, this means that the serialization and the deserialization of JSON containing binary values into BJData and back will result in a different JSON object.

    Example 
    #include <iostream>\n#include <iomanip>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\nusing namespace nlohmann::literals;\n\n// function to print BJData's diagnostic format\nvoid print_byte(uint8_t byte)\n{\n    if (32 < byte and byte < 128)\n    {\n        std::cout << (char)byte;\n    }\n    else\n    {\n        std::cout << (int)byte;\n    }\n}\n\nint main()\n{\n    // create a JSON value\n    json j = R\"({\"compact\": true, \"schema\": false})\"_json;\n\n    // serialize it to BJData\n    std::vector<std::uint8_t> v = json::to_bjdata(j);\n\n    // print the vector content\n    for (auto& byte : v)\n    {\n        print_byte(byte);\n    }\n    std::cout << std::endl;\n\n    // create an array of numbers\n    json array = {1, 2, 3, 4, 5, 6, 7, 8};\n\n    // serialize it to BJData using default representation\n    std::vector<std::uint8_t> v_array = json::to_bjdata(array);\n    // serialize it to BJData using size optimization\n    std::vector<std::uint8_t> v_array_size = json::to_bjdata(array, true);\n    // serialize it to BJData using type optimization\n    std::vector<std::uint8_t> v_array_size_and_type = json::to_bjdata(array, true, true);\n\n    // print the vector contents\n    for (auto& byte : v_array)\n    {\n        print_byte(byte);\n    }\n    std::cout << std::endl;\n\n    for (auto& byte : v_array_size)\n    {\n        print_byte(byte);\n    }\n    std::cout << std::endl;\n\n    for (auto& byte : v_array_size_and_type)\n    {\n        print_byte(byte);\n    }\n    std::cout << std::endl;\n}\n

    Output:

    {i7compactTi6schemaF}\n[i1i2i3i4i5i6i7i8]\n[#i8i1i2i3i4i5i6i7i8\n[$i#i812345678\n
    "},{"location":"features/binary_formats/bjdata/#deserialization","title":"Deserialization","text":"

    The library maps BJData types to JSON value types as follows:

    BJData type JSON value type marker no-op no value, next value is read N null null Z false false F true true T float16 number_float h float32 number_float d float64 number_float D uint8 number_unsigned U int8 number_integer i uint16 number_unsigned u int16 number_integer I uint32 number_unsigned m int32 number_integer l uint64 number_unsigned M int64 number_integer L byte number_unsigned B string string S char string C array array (optimized values are supported) [ ND-array object (in JData annotated array format) [$.#[. object object (optimized values are supported) { binary binary (strongly-typed byte array) [$B

    Complete mapping

    The mapping is complete in the sense that any BJData value can be converted to a JSON value.

    Example 
    #include <iostream>\n#include <iomanip>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // create byte vector\n    std::vector<std::uint8_t> v = {0x7B, 0x69, 0x07, 0x63, 0x6F, 0x6D, 0x70, 0x61,\n                                   0x63, 0x74, 0x54, 0x69, 0x06, 0x73, 0x63, 0x68,\n                                   0x65, 0x6D, 0x61, 0x69, 0x00, 0x7D\n                                  };\n\n    // deserialize it with BJData\n    json j = json::from_bjdata(v);\n\n    // print the deserialized JSON value\n    std::cout << std::setw(2) << j << std::endl;\n}\n

    Output:

    {\n  \"compact\": true,\n  \"schema\": 0\n}\n
    "},{"location":"features/binary_formats/bson/","title":"BSON","text":"

    BSON, short for Binary JSON, is a binary-encoded serialization of JSON-like documents. Like JSON, BSON supports the embedding of documents and arrays within other documents and arrays. BSON also contains extensions that allow representation of data types that are not part of the JSON spec. For example, BSON has a Date type and a BinData type.

    References

    • BSON Website - the main source on BSON
    • BSON Specification - the specification
    "},{"location":"features/binary_formats/bson/#serialization","title":"Serialization","text":"

    The library uses the following mapping from JSON values types to BSON types:

    JSON value type value/range BSON type marker null null null 0x0A boolean true, false boolean 0x08 number_integer -9223372036854775808..-2147483649 int64 0x12 number_integer -2147483648..2147483647 int32 0x10 number_integer 2147483648..9223372036854775807 int64 0x12 number_unsigned 0..2147483647 int32 0x10 number_unsigned 2147483648..9223372036854775807 int64 0x12 number_unsigned 9223372036854775808..18446744073709551615 uint64 0x11 number_float any value double 0x01 string any value string 0x02 array any value document 0x04 object any value document 0x03 binary any value binary 0x05

    Incomplete mapping

    The mapping is incomplete, since only JSON-objects (and things contained therein) can be serialized to BSON. Also, keys may not contain U+0000, since they are serialized a zero-terminated c-strings.

    Example 
    #include <iostream>\n#include <iomanip>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\nusing namespace nlohmann::literals;\n\nint main()\n{\n    // create a JSON value\n    json j = R\"({\"compact\": true, \"schema\": 0})\"_json;\n\n    // serialize it to BSON\n    std::vector<std::uint8_t> v = json::to_bson(j);\n\n    // print the vector content\n    for (auto& byte : v)\n    {\n        std::cout << \"0x\" << std::hex << std::setw(2) << std::setfill('0') << (int)byte << \" \";\n    }\n    std::cout << std::endl;\n}\n

    Output:

    0x1b 0x00 0x00 0x00 0x08 0x63 0x6f 0x6d 0x70 0x61 0x63 0x74 0x00 0x01 0x10 0x73 0x63 0x68 0x65 0x6d 0x61 0x00 0x00 0x00 0x00 0x00 0x00 \n
    "},{"location":"features/binary_formats/bson/#deserialization","title":"Deserialization","text":"

    The library maps BSON record types to JSON value types as follows:

    BSON type BSON marker byte JSON value type double 0x01 number_float string 0x02 string document 0x03 object array 0x04 array binary 0x05 binary undefined 0x06 unsupported ObjectId 0x07 unsupported boolean 0x08 boolean UTC Date-Time 0x09 unsupported null 0x0A null Regular Expr. 0x0B unsupported DB Pointer 0x0C unsupported JavaScript Code 0x0D unsupported Symbol 0x0E unsupported JavaScript Code 0x0F unsupported int32 0x10 number_integer uint64(Timestamp) 0x11 number_unsigned 128-bit decimal float 0x13 unsupported Max Key 0x7F unsupported Min Key 0xFF unsupported

    Incomplete mapping

    The mapping is incomplete. The unsupported mappings are indicated in the table above.

    Handling of BSON type 0x11

    BSON type 0x11 is used to represent uint64 numbers. This library treats these values purely as uint64 numbers and does not parse them into date-related formats.

    Example 
    #include <iostream>\n#include <iomanip>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // create byte vector\n    std::vector<std::uint8_t> v = {0x1b, 0x00, 0x00, 0x00, 0x08, 0x63, 0x6f, 0x6d,\n                                   0x70, 0x61, 0x63, 0x74, 0x00, 0x01, 0x10, 0x73,\n                                   0x63, 0x68, 0x65, 0x6d, 0x61, 0x00, 0x00, 0x00,\n                                   0x00, 0x00, 0x00\n                                  };\n\n    // deserialize it with BSON\n    json j = json::from_bson(v);\n\n    // print the deserialized JSON value\n    std::cout << std::setw(2) << j << std::endl;\n}\n

    Output:

    {\n  \"compact\": true,\n  \"schema\": 0\n}\n
    "},{"location":"features/binary_formats/cbor/","title":"CBOR","text":"

    The Concise Binary Object Representation (CBOR) is a data format whose design goals include the possibility of extremely small code sizes, fairly small message size, and extensibility without the need for version negotiation.

    References

    • CBOR Website - the main source on CBOR
    • CBOR Playground - an interactive webpage to translate between JSON and CBOR
    • RFC 7049 - the CBOR specification
    "},{"location":"features/binary_formats/cbor/#serialization","title":"Serialization","text":"

    The library uses the following mapping from JSON values types to CBOR types according to the CBOR specification (RFC 7049):

    JSON value type value/range CBOR type first byte null null Null 0xF6 boolean true True 0xF5 boolean false False 0xF4 number_integer -9223372036854775808..-2147483649 Negative integer (8 bytes follow) 0x3B number_integer -2147483648..-32769 Negative integer (4 bytes follow) 0x3A number_integer -32768..-129 Negative integer (2 bytes follow) 0x39 number_integer -128..-25 Negative integer (1 byte follow) 0x38 number_integer -24..-1 Negative integer 0x20..0x37 number_integer 0..23 Integer 0x00..0x17 number_integer 24..255 Unsigned integer (1 byte follow) 0x18 number_integer 256..65535 Unsigned integer (2 bytes follow) 0x19 number_integer 65536..4294967295 Unsigned integer (4 bytes follow) 0x1A number_integer 4294967296..18446744073709551615 Unsigned integer (8 bytes follow) 0x1B number_unsigned 0..23 Integer 0x00..0x17 number_unsigned 24..255 Unsigned integer (1 byte follow) 0x18 number_unsigned 256..65535 Unsigned integer (2 bytes follow) 0x19 number_unsigned 65536..4294967295 Unsigned integer (4 bytes follow) 0x1A number_unsigned 4294967296..18446744073709551615 Unsigned integer (8 bytes follow) 0x1B number_float any value representable by a float Single-Precision Float 0xFA number_float any value NOT representable by a float Double-Precision Float 0xFB string length: 0..23 UTF-8 string 0x60..0x77 string length: 23..255 UTF-8 string (1 byte follow) 0x78 string length: 256..65535 UTF-8 string (2 bytes follow) 0x79 string length: 65536..4294967295 UTF-8 string (4 bytes follow) 0x7A string length: 4294967296..18446744073709551615 UTF-8 string (8 bytes follow) 0x7B array size: 0..23 array 0x80..0x97 array size: 23..255 array (1 byte follow) 0x98 array size: 256..65535 array (2 bytes follow) 0x99 array size: 65536..4294967295 array (4 bytes follow) 0x9A array size: 4294967296..18446744073709551615 array (8 bytes follow) 0x9B object size: 0..23 map 0xA0..0xB7 object size: 23..255 map (1 byte follow) 0xB8 object size: 256..65535 map (2 bytes follow) 0xB9 object size: 65536..4294967295 map (4 bytes follow) 0xBA object size: 4294967296..18446744073709551615 map (8 bytes follow) 0xBB binary size: 0..23 byte string 0x40..0x57 binary size: 23..255 byte string (1 byte follow) 0x58 binary size: 256..65535 byte string (2 bytes follow) 0x59 binary size: 65536..4294967295 byte string (4 bytes follow) 0x5A binary size: 4294967296..18446744073709551615 byte string (8 bytes follow) 0x5B

    Binary values with subtype are mapped to tagged values (0xD8..0xDB) depending on the subtype, followed by a byte string, see \"binary\" cells in the table above.

    Complete mapping

    The mapping is complete in the sense that any JSON value type can be converted to a CBOR value.

    NaN/infinity handling

    If NaN or Infinity are stored inside a JSON number, they are serialized properly. This behavior differs from the normal JSON serialization which serializes NaN or Infinity to null.

    Unused CBOR types

    The following CBOR types are not used in the conversion:

    • UTF-8 strings terminated by \"break\" (0x7F)
    • arrays terminated by \"break\" (0x9F)
    • maps terminated by \"break\" (0xBF)
    • byte strings terminated by \"break\" (0x5F)
    • date/time (0xC0..0xC1)
    • bignum (0xC2..0xC3)
    • decimal fraction (0xC4)
    • bigfloat (0xC5)
    • expected conversions (0xD5..0xD7)
    • simple values (0xE0..0xF3, 0xF8)
    • undefined (0xF7)
    • half-precision floats (0xF9)
    • break (0xFF)

    Tagged items

    Binary subtypes will be serialized as tagged items. See binary values for an example.

    Example 
    #include <iostream>\n#include <iomanip>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\nusing namespace nlohmann::literals;\n\nint main()\n{\n    // create a JSON value\n    json j = R\"({\"compact\": true, \"schema\": 0})\"_json;\n\n    // serialize it to CBOR\n    std::vector<std::uint8_t> v = json::to_cbor(j);\n\n    // print the vector content\n    for (auto& byte : v)\n    {\n        std::cout << \"0x\" << std::hex << std::setw(2) << std::setfill('0') << (int)byte << \" \";\n    }\n    std::cout << std::endl;\n}\n

    Output:

    0xa2 0x67 0x63 0x6f 0x6d 0x70 0x61 0x63 0x74 0xf5 0x66 0x73 0x63 0x68 0x65 0x6d 0x61 0x00 \n
    "},{"location":"features/binary_formats/cbor/#deserialization","title":"Deserialization","text":"

    The library maps CBOR types to JSON value types as follows:

    CBOR type JSON value type first byte Integer number_unsigned 0x00..0x17 Unsigned integer number_unsigned 0x18 Unsigned integer number_unsigned 0x19 Unsigned integer number_unsigned 0x1A Unsigned integer number_unsigned 0x1B Negative integer number_integer 0x20..0x37 Negative integer number_integer 0x38 Negative integer number_integer 0x39 Negative integer number_integer 0x3A Negative integer number_integer 0x3B Byte string binary 0x40..0x57 Byte string binary 0x58 Byte string binary 0x59 Byte string binary 0x5A Byte string binary 0x5B UTF-8 string string 0x60..0x77 UTF-8 string string 0x78 UTF-8 string string 0x79 UTF-8 string string 0x7A UTF-8 string string 0x7B UTF-8 string string 0x7F array array 0x80..0x97 array array 0x98 array array 0x99 array array 0x9A array array 0x9B array array 0x9F map object 0xA0..0xB7 map object 0xB8 map object 0xB9 map object 0xBA map object 0xBB map object 0xBF False false 0xF4 True true 0xF5 Null null 0xF6 Half-Precision Float number_float 0xF9 Single-Precision Float number_float 0xFA Double-Precision Float number_float 0xFB

    Incomplete mapping

    The mapping is incomplete in the sense that not all CBOR types can be converted to a JSON value. The following CBOR types are not supported and will yield parse errors:

    • date/time (0xC0..0xC1)
    • bignum (0xC2..0xC3)
    • decimal fraction (0xC4)
    • bigfloat (0xC5)
    • expected conversions (0xD5..0xD7)
    • simple values (0xE0..0xF3, 0xF8)
    • undefined (0xF7)

    Object keys

    CBOR allows map keys of any type, whereas JSON only allows strings as keys in object values. Therefore, CBOR maps with keys other than UTF-8 strings are rejected.

    Tagged items

    Tagged items will throw a parse error by default. They can be ignored by passing cbor_tag_handler_t::ignore to function from_cbor. They can be stored by passing cbor_tag_handler_t::store to function from_cbor.

    Example 
    #include <iostream>\n#include <iomanip>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // create byte vector\n    std::vector<std::uint8_t> v = {0xa2, 0x67, 0x63, 0x6f, 0x6d, 0x70, 0x61, 0x63,\n                                   0x74, 0xf5, 0x66, 0x73, 0x63, 0x68, 0x65, 0x6d,\n                                   0x61, 0x00\n                                  };\n\n    // deserialize it with CBOR\n    json j = json::from_cbor(v);\n\n    // print the deserialized JSON value\n    std::cout << std::setw(2) << j << std::endl;\n}\n

    Output:

    {\n  \"compact\": true,\n  \"schema\": 0\n}\n
    "},{"location":"features/binary_formats/messagepack/","title":"MessagePack","text":"

    MessagePack is an efficient binary serialization format. It lets you exchange data among multiple languages like JSON. But it's faster and smaller. Small integers are encoded into a single byte, and typical short strings require only one extra byte in addition to the strings themselves.

    References

    • MessagePack website
    • MessagePack specification
    "},{"location":"features/binary_formats/messagepack/#serialization","title":"Serialization","text":"

    The library uses the following mapping from JSON values types to MessagePack types according to the MessagePack specification:

    JSON value type value/range MessagePack type first byte null null nil 0xC0 boolean true true 0xC3 boolean false false 0xC2 number_integer -9223372036854775808..-2147483649 int64 0xD3 number_integer -2147483648..-32769 int32 0xD2 number_integer -32768..-129 int16 0xD1 number_integer -128..-33 int8 0xD0 number_integer -32..-1 negative fixint 0xE0..0xFF number_integer 0..127 positive fixint 0x00..0x7F number_integer 128..255 uint 8 0xCC number_integer 256..65535 uint 16 0xCD number_integer 65536..4294967295 uint 32 0xCE number_integer 4294967296..18446744073709551615 uint 64 0xCF number_unsigned 0..127 positive fixint 0x00..0x7F number_unsigned 128..255 uint 8 0xCC number_unsigned 256..65535 uint 16 0xCD number_unsigned 65536..4294967295 uint 32 0xCE number_unsigned 4294967296..18446744073709551615 uint 64 0xCF number_float any value representable by a float float 32 0xCA number_float any value NOT representable by a float float 64 0xCB string length: 0..31 fixstr 0xA0..0xBF string length: 32..255 str 8 0xD9 string length: 256..65535 str 16 0xDA string length: 65536..4294967295 str 32 0xDB array size: 0..15 fixarray 0x90..0x9F array size: 16..65535 array 16 0xDC array size: 65536..4294967295 array 32 0xDD object size: 0..15 fix map 0x80..0x8F object size: 16..65535 map 16 0xDE object size: 65536..4294967295 map 32 0xDF binary size: 0..255 bin 8 0xC4 binary size: 256..65535 bin 16 0xC5 binary size: 65536..4294967295 bin 32 0xC6

    Complete mapping

    The mapping is complete in the sense that any JSON value type can be converted to a MessagePack value.

    Any MessagePack output created by to_msgpack can be successfully parsed by from_msgpack.

    Size constraints

    The following values can not be converted to a MessagePack value:

    • strings with more than 4294967295 bytes
    • byte strings with more than 4294967295 bytes
    • arrays with more than 4294967295 elements
    • objects with more than 4294967295 elements

    NaN/infinity handling

    If NaN or Infinity are stored inside a JSON number, they are serialized properly in contrast to the dump function which serializes NaN or Infinity to null.

    Example 
    #include <iostream>\n#include <iomanip>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\nusing namespace nlohmann::literals;\n\nint main()\n{\n    // create a JSON value\n    json j = R\"({\"compact\": true, \"schema\": 0})\"_json;\n\n    // serialize it to MessagePack\n    std::vector<std::uint8_t> v = json::to_msgpack(j);\n\n    // print the vector content\n    for (auto& byte : v)\n    {\n        std::cout << \"0x\" << std::hex << std::setw(2) << std::setfill('0') << (int)byte << \" \";\n    }\n    std::cout << std::endl;\n}\n

    Output:

    0x82 0xa7 0x63 0x6f 0x6d 0x70 0x61 0x63 0x74 0xc3 0xa6 0x73 0x63 0x68 0x65 0x6d 0x61 0x00 \n
    "},{"location":"features/binary_formats/messagepack/#deserialization","title":"Deserialization","text":"

    The library maps MessagePack types to JSON value types as follows:

    MessagePack type JSON value type first byte positive fixint number_unsigned 0x00..0x7F fixmap object 0x80..0x8F fixarray array 0x90..0x9F fixstr string 0xA0..0xBF nil null 0xC0 false false 0xC2 true true 0xC3 float 32 number_float 0xCA float 64 number_float 0xCB uint 8 number_unsigned 0xCC uint 16 number_unsigned 0xCD uint 32 number_unsigned 0xCE uint 64 number_unsigned 0xCF int 8 number_integer 0xD0 int 16 number_integer 0xD1 int 32 number_integer 0xD2 int 64 number_integer 0xD3 str 8 string 0xD9 str 16 string 0xDA str 32 string 0xDB array 16 array 0xDC array 32 array 0xDD map 16 object 0xDE map 32 object 0xDF bin 8 binary 0xC4 bin 16 binary 0xC5 bin 32 binary 0xC6 ext 8 binary 0xC7 ext 16 binary 0xC8 ext 32 binary 0xC9 fixext 1 binary 0xD4 fixext 2 binary 0xD5 fixext 4 binary 0xD6 fixext 8 binary 0xD7 fixext 16 binary 0xD8 negative fixint number_integer 0xE0-0xFF

    Info

    Any MessagePack output created by to_msgpack can be successfully parsed by from_msgpack.

    Example 
    #include <iostream>\n#include <iomanip>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // create byte vector\n    std::vector<std::uint8_t> v = {0x82, 0xa7, 0x63, 0x6f, 0x6d, 0x70, 0x61, 0x63,\n                                   0x74, 0xc3, 0xa6, 0x73, 0x63, 0x68, 0x65, 0x6d,\n                                   0x61, 0x00\n                                  };\n\n    // deserialize it with MessagePack\n    json j = json::from_msgpack(v);\n\n    // print the deserialized JSON value\n    std::cout << std::setw(2) << j << std::endl;\n}\n

    Output:

    {\n  \"compact\": true,\n  \"schema\": 0\n}\n
    "},{"location":"features/binary_formats/ubjson/","title":"UBJSON","text":"

    Universal Binary JSON (UBJSON) is a binary form directly imitating JSON, but requiring fewer bytes of data. It aims to achieve the generality of JSON, combined with being much easier to process than JSON.

    References

    • UBJSON Website
    "},{"location":"features/binary_formats/ubjson/#serialization","title":"Serialization","text":"

    The library uses the following mapping from JSON values types to UBJSON types according to the UBJSON specification:

    JSON value type value/range UBJSON type marker null null null Z boolean true true T boolean false false F number_integer -9223372036854775808..-2147483649 int64 L number_integer -2147483648..-32769 int32 l number_integer -32768..-129 int16 I number_integer -128..127 int8 i number_integer 128..255 uint8 U number_integer 256..32767 int16 I number_integer 32768..2147483647 int32 l number_integer 2147483648..9223372036854775807 int64 L number_unsigned 0..127 int8 i number_unsigned 128..255 uint8 U number_unsigned 256..32767 int16 I number_unsigned 32768..2147483647 int32 l number_unsigned 2147483648..9223372036854775807 int64 L number_unsigned 2147483649..18446744073709551615 high-precision H number_float any value float64 D string with shortest length indicator string S array see notes on optimized format array [ object see notes on optimized format map {

    Complete mapping

    The mapping is complete in the sense that any JSON value type can be converted to a UBJSON value.

    Any UBJSON output created by to_ubjson can be successfully parsed by from_ubjson.

    Size constraints

    The following values can not be converted to a UBJSON value:

    • strings with more than 9223372036854775807 bytes (theoretical)

    Unused UBJSON markers

    The following markers are not used in the conversion:

    • Z: no-op values are not created.
    • C: single-byte strings are serialized with S markers.

    NaN/infinity handling

    If NaN or Infinity are stored inside a JSON number, they are serialized properly. This behavior differs from the dump() function which serializes NaN or Infinity to null.

    Optimized formats

    The optimized formats for containers are supported: Parameter use_size adds size information to the beginning of a container and removes the closing marker. Parameter use_type further checks whether all elements of a container have the same type and adds the type marker to the beginning of the container. The use_type parameter must only be used together with use_size = true.

    Note that use_size = true alone may result in larger representations - the benefit of this parameter is that the receiving side is immediately informed on the number of elements of the container.

    Binary values

    If the JSON data contains the binary type, the value stored is a list of integers, as suggested by the UBJSON documentation. In particular, this means that serialization and the deserialization of a JSON containing binary values into UBJSON and back will result in a different JSON object.

    Example 
    #include <iostream>\n#include <iomanip>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\nusing namespace nlohmann::literals;\n\n// function to print UBJSON's diagnostic format\nvoid print_byte(uint8_t byte)\n{\n    if (32 < byte and byte < 128)\n    {\n        std::cout << (char)byte;\n    }\n    else\n    {\n        std::cout << (int)byte;\n    }\n}\n\nint main()\n{\n    // create a JSON value\n    json j = R\"({\"compact\": true, \"schema\": false})\"_json;\n\n    // serialize it to UBJSON\n    std::vector<std::uint8_t> v = json::to_ubjson(j);\n\n    // print the vector content\n    for (auto& byte : v)\n    {\n        print_byte(byte);\n    }\n    std::cout << std::endl;\n\n    // create an array of numbers\n    json array = {1, 2, 3, 4, 5, 6, 7, 8};\n\n    // serialize it to UBJSON using default representation\n    std::vector<std::uint8_t> v_array = json::to_ubjson(array);\n    // serialize it to UBJSON using size optimization\n    std::vector<std::uint8_t> v_array_size = json::to_ubjson(array, true);\n    // serialize it to UBJSON using type optimization\n    std::vector<std::uint8_t> v_array_size_and_type = json::to_ubjson(array, true, true);\n\n    // print the vector contents\n    for (auto& byte : v_array)\n    {\n        print_byte(byte);\n    }\n    std::cout << std::endl;\n\n    for (auto& byte : v_array_size)\n    {\n        print_byte(byte);\n    }\n    std::cout << std::endl;\n\n    for (auto& byte : v_array_size_and_type)\n    {\n        print_byte(byte);\n    }\n    std::cout << std::endl;\n}\n

    Output:

    {i7compactTi6schemaF}\n[i1i2i3i4i5i6i7i8]\n[#i8i1i2i3i4i5i6i7i8\n[$i#i812345678\n
    "},{"location":"features/binary_formats/ubjson/#deserialization","title":"Deserialization","text":"

    The library maps UBJSON types to JSON value types as follows:

    UBJSON type JSON value type marker no-op no value, next value is read N null null Z false false F true true T float32 number_float d float64 number_float D uint8 number_unsigned U int8 number_integer i int16 number_integer I int32 number_integer l int64 number_integer L string string S char string C array array (optimized values are supported) [ object object (optimized values are supported) {

    Complete mapping

    The mapping is complete in the sense that any UBJSON value can be converted to a JSON value.

    Example 
    #include <iostream>\n#include <iomanip>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // create byte vector\n    std::vector<std::uint8_t> v = {0x7B, 0x69, 0x07, 0x63, 0x6F, 0x6D, 0x70, 0x61,\n                                   0x63, 0x74, 0x54, 0x69, 0x06, 0x73, 0x63, 0x68,\n                                   0x65, 0x6D, 0x61, 0x69, 0x00, 0x7D\n                                  };\n\n    // deserialize it with UBJSON\n    json j = json::from_ubjson(v);\n\n    // print the deserialized JSON value\n    std::cout << std::setw(2) << j << std::endl;\n}\n

    Output:

    {\n  \"compact\": true,\n  \"schema\": 0\n}\n
    "},{"location":"features/element_access/","title":"Element Access","text":"

    There are many ways elements in a JSON value can be accessed:

    • unchecked access via operator[]
    • checked access via at
    • access with default value via value
    • iterators
    • JSON pointers
    "},{"location":"features/element_access/checked_access/","title":"Checked access: at","text":""},{"location":"features/element_access/checked_access/#overview","title":"Overview","text":"

    The at member function performs checked access; that is, it returns a reference to the desired value if it exists and throws a basic_json::out_of_range exception otherwise.

    Read access

    Consider the following JSON value:

    {\n    \"name\": \"Mary Smith\",\n    \"age\": 42,\n    \"hobbies\": [\"hiking\", \"reading\"]\n}\n

    Assume the value is parsed to a json variable j.

    expression value j {\"name\": \"Mary Smith\", \"age\": 42, \"hobbies\": [\"hiking\", \"reading\"]} j.at(\"name\") \"Mary Smith\" j.at(\"age\") 42 j.at(\"hobbies\") [\"hiking\", \"reading\"] j.at(\"hobbies\").at(0) \"hiking\" j.at(\"hobbies\").at(1) \"reading\"

    The return value is a reference, so it can be modified by the original value.

    Write access 
    j.at(\"name\") = \"John Smith\";\n

    This code produces the following JSON value:

    {\n    \"name\": \"John Smith\",\n    \"age\": 42,\n    \"hobbies\": [\"hiking\", \"reading\"]\n}\n

    When accessing an invalid index (i.e., an index greater than or equal to the array size) or the passed object key is non-existing, an exception is thrown.

    Accessing via invalid index or missing key 
    j.at(\"hobbies\").at(3) = \"cooking\";\n

    This code produces the following exception:

    [json.exception.out_of_range.401] array index 3 is out of range\n

    When you extended diagnostic messages are enabled by defining JSON_DIAGNOSTICS, the exception further gives information where the key or index is missing or out of range.

    [json.exception.out_of_range.401] (/hobbies) array index 3 is out of range\n
    "},{"location":"features/element_access/checked_access/#notes","title":"Notes","text":"

    Exceptions

    • at can only be used with objects (with a string argument) or with arrays (with a numeric argument). For other types, a basic_json::type_error is thrown.
    • basic_json::out_of_range exception exceptions are thrown if the provided key is not found in an object or the provided index is invalid.
    "},{"location":"features/element_access/checked_access/#summary","title":"Summary","text":"scenario non-const value const value access to existing object key reference to existing value is returned const reference to existing value is returned access to valid array index reference to existing value is returned const reference to existing value is returned access to non-existing object key basic_json::out_of_range exception is thrown basic_json::out_of_range exception is thrown access to invalid array index basic_json::out_of_range exception is thrown basic_json::out_of_range exception is thrown"},{"location":"features/element_access/default_value/","title":"Access with default value: value","text":""},{"location":"features/element_access/default_value/#overview","title":"Overview","text":"

    In many situations, such as configuration files, missing values are not exceptional, but may be treated as if a default value was present. For this case, use value(key, default_value) which takes the key you want to access and a default value in case there is no value stored with that key.

    "},{"location":"features/element_access/default_value/#example","title":"Example","text":"Example

    Consider the following JSON value:

    {\n    \"logOutput\": \"result.log\",\n    \"append\": true\n}\n

    Assume the value is parsed to a json variable j.

    expression value j {\"logOutput\": \"result.log\", \"append\": true} j.value(\"logOutput\", \"logfile.log\") \"result.log\" j.value(\"append\", true) true j.value(\"append\", false) true j.value(\"logLevel\", \"verbose\") \"verbose\""},{"location":"features/element_access/default_value/#notes","title":"Notes","text":"

    Exceptions

    • value can only be used with objects. For other types, a basic_json::type_error is thrown.

    Return type

    The value function is a template, and the return type of the function is determined by the type of the provided default value unless otherwise specified. This can have unexpected effects. In the example below, we store a 64-bit unsigned integer. We get exactly that value when using operator[]. However, when we call value and provide 0 as default value, then -1 is returned. The occurs, because 0 has type int which overflows when handling the value 18446744073709551615.

    To address this issue, either provide a correctly typed default value or use the template parameter to specify the desired return type. Note that this issue occurs even when a value is stored at the provided key, and the default value is not used as the return value.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    json j = json::parse(R\"({\"uint64\": 18446744073709551615})\");\n\n    std::cout << \"operator[]:                \" << j[\"uint64\"] << '\\n'\n              << \"default value (int):       \" << j.value(\"uint64\", 0) << '\\n'\n              << \"default value (uint64_t):  \" << j.value(\"uint64\", std::uint64_t(0)) << '\\n'\n              << \"explict return value type: \" << j.value<std::uint64_t>(\"uint64\", 0) << '\\n';\n}\n

    Output:

    operator[]:                18446744073709551615\ndefault value (int):       -1\ndefault value (uint64_t):  18446744073709551615\nexplict return value type: 18446744073709551615\n
    "},{"location":"features/element_access/default_value/#see-also","title":"See also","text":"
    • value for access with default value
    • documentation on checked access
    "},{"location":"features/element_access/unchecked_access/","title":"Unchecked access: operator[]","text":""},{"location":"features/element_access/unchecked_access/#overview","title":"Overview","text":"

    Elements in a JSON object and a JSON array can be accessed via operator[] similar to a std::map and a std::vector, respectively.

    Read access

    Consider the following JSON value:

    {\n    \"name\": \"Mary Smith\",\n    \"age\": 42,\n    \"hobbies\": [\"hiking\", \"reading\"]\n}\n

    Assume the value is parsed to a json variable j.

    expression value j {\"name\": \"Mary Smith\", \"age\": 42, \"hobbies\": [\"hiking\", \"reading\"]} j[\"name\"] \"Mary Smith\" j[\"age\"] 42 j[\"hobbies\"] [\"hiking\", \"reading\"] j[\"hobbies\"][0] \"hiking\" j[\"hobbies\"][1] \"reading\"

    The return value is a reference, so it can modify the original value. In case the passed object key is non-existing, a null value is inserted which can immediately be overwritten.

    Write access 
    j[\"name\"] = \"John Smith\";\nj[\"maidenName\"] = \"Jones\";\n

    This code produces the following JSON value:

    {\n    \"name\": \"John Smith\",\n    \"maidenName\": \"Jones\",\n    \"age\": 42,\n    \"hobbies\": [\"hiking\", \"reading\"]\n}\n

    When accessing an invalid index (i.e., an index greater than or equal to the array size), the JSON array is resized such that the passed index is the new maximal index. Intermediate values are filled with null.

    Filling up arrays with null values 
    j[\"hobbies\"][0] = \"running\";\nj[\"hobbies\"][3] = \"cooking\";\n

    This code produces the following JSON value:

    {\n    \"name\": \"John Smith\",\n    \"maidenName\": \"Jones\",\n    \"age\": 42,\n    \"hobbies\": [\"running\", \"reading\", null, \"cooking\"]\n}\n
    "},{"location":"features/element_access/unchecked_access/#notes","title":"Notes","text":"

    Design rationale

    The library behaves differently to std::vector and std::map:

    • std::vector::operator[] never inserts a new element.
    • std::map::operator[] is not available for const values.

    The type json wraps all JSON value types. It would be impossible to remove operator[] for const objects. At the same time, inserting elements for non-const objects is really convenient as it avoids awkward insert calls. To this end, we decided to have an inserting non-const behavior for both arrays and objects.

    Info

    The access is unchecked. In case the passed object key does not exist or the passed array index is invalid, no exception is thrown.

    Danger

    • It is undefined behavior to access a const object with a non-existing key.
    • It is undefined behavior to access a const array with an invalid index.
    • In debug mode, an assertion will fire in both cases. You can disable assertions by defining the preprocessor symbol NDEBUG or redefine the macro JSON_ASSERT(x). See the documentation on runtime assertions for more information.

    Exceptions

    operator[] can only be used with objects (with a string argument) or with arrays (with a numeric argument). For other types, a basic_json::type_error is thrown.

    "},{"location":"features/element_access/unchecked_access/#summary","title":"Summary","text":"scenario non-const value const value access to existing object key reference to existing value is returned const reference to existing value is returned access to valid array index reference to existing value is returned const reference to existing value is returned access to non-existing object key reference to newly inserted null value is returned undefined behavior; runtime assertion in debug mode access to invalid array index reference to newly inserted null value is returned; any index between previous maximal index and passed index are filled with null undefined behavior; runtime assertion in debug mode"},{"location":"features/parsing/","title":"Parsing","text":"

    Note

    This page is under construction.

    "},{"location":"features/parsing/#input","title":"Input","text":""},{"location":"features/parsing/#sax-vs-dom-parsing","title":"SAX vs. DOM parsing","text":""},{"location":"features/parsing/#exceptions","title":"Exceptions","text":"

    See parsing and exceptions.

    "},{"location":"features/parsing/json_lines/","title":"JSON Lines","text":"

    The JSON Lines format is a text format of newline-delimited JSON. In particular:

    1. The input must be UTF-8 encoded.
    2. Every line must be a valid JSON value.
    3. The line separator must be \\n. As \\r is silently ignored, \\r\\n is also supported.
    4. The final character may be \\n, but is not required to be one.

    JSON Text example

    {\"name\": \"Gilbert\", \"wins\": [[\"straight\", \"7\u2663\"], [\"one pair\", \"10\u2665\"]]}\n{\"name\": \"Alexa\", \"wins\": [[\"two pair\", \"4\u2660\"], [\"two pair\", \"9\u2660\"]]}\n{\"name\": \"May\", \"wins\": []}\n{\"name\": \"Deloise\", \"wins\": [[\"three of a kind\", \"5\u2663\"]]}\n

    JSON Lines input with more than one value is treated as invalid JSON by the parse or accept functions. To process it line by line, functions like std::getline can be used:

    Example: Parse JSON Text input line by line

    The example below demonstrates how JSON Lines can be processed.

    #include <sstream>\n#include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // JSON Lines (see https://jsonlines.org)\n    std::stringstream input;\n    input << R\"({\"name\": \"Gilbert\", \"wins\": [[\"straight\", \"7\u2663\"], [\"one pair\", \"10\u2665\"]]}\n{\"name\": \"Alexa\", \"wins\": [[\"two pair\", \"4\u2660\"], [\"two pair\", \"9\u2660\"]]}\n{\"name\": \"May\", \"wins\": []}\n{\"name\": \"Deloise\", \"wins\": [[\"three of a kind\", \"5\u2663\"]]}\n)\";\n\n    std::string line;\n    while (std::getline(input, line))\n    {\n        std::cout << json::parse(line) << std::endl;\n    }\n}\n

    Output:

    {\"name\":\"Gilbert\",\"wins\":[[\"straight\",\"7\u2663\"],[\"one pair\",\"10\u2665\"]]}\n{\"name\":\"Alexa\",\"wins\":[[\"two pair\",\"4\u2660\"],[\"two pair\",\"9\u2660\"]]}\n{\"name\":\"May\",\"wins\":[]}\n{\"name\":\"Deloise\",\"wins\":[[\"three of a kind\",\"5\u2663\"]]}\n

    Note

    Using operator>> like

    json j;\nwhile (input >> j)\n{\n    std::cout << j << std::endl;\n}\n

    with a JSON Lines input does not work, because the parser will try to parse one value after the last one.

    "},{"location":"features/parsing/parse_exceptions/","title":"Parsing and Exceptions","text":"

    When the input is not valid JSON, an exception of type parse_error is thrown. This exception contains the position in the input where the error occurred, together with a diagnostic message and the last read input token. The exceptions page contains a list of examples for parse error exceptions. In case you process untrusted input, always enclose your code with a try/catch block, like

    json j;\ntry\n{\n    j = json::parse(my_input);\n}\ncatch (json::parse_error& ex)\n{\n    std::cerr << \"parse error at byte \" << ex.byte << std::endl;\n}\n

    In case exceptions are undesired or not supported by the environment, there are different ways to proceed:

    "},{"location":"features/parsing/parse_exceptions/#switch-off-exceptions","title":"Switch off exceptions","text":"

    The parse() function accepts a bool parameter allow_exceptions which controls whether an exception is thrown when a parse error occurs (true, default) or whether a discarded value should be returned (false).

    json j = json::parse(my_input, nullptr, false);\nif (j.is_discarded())\n{\n    std::cerr << \"parse error\" << std::endl;\n}\n

    Note there is no diagnostic information available in this scenario.

    "},{"location":"features/parsing/parse_exceptions/#use-accept-function","title":"Use accept() function","text":"

    Alternatively, function accept() can be used which does not return a json value, but a bool indicating whether the input is valid JSON.

    if (!json::accept(my_input))\n{\n    std::cerr << \"parse error\" << std::endl;\n}\n

    Again, there is no diagnostic information available.

    "},{"location":"features/parsing/parse_exceptions/#user-defined-sax-interface","title":"User-defined SAX interface","text":"

    Finally, you can implement the SAX interface and decide what should happen in case of a parse error.

    This function has the following interface:

    bool parse_error(std::size_t position,\n                 const std::string& last_token,\n                 const json::exception& ex);\n

    The return value indicates whether the parsing should continue, so the function should usually return false.

    Example 
    #include <iostream>\n#include \"json.hpp\"\n\nusing json = nlohmann::json;\n\nclass sax_no_exception : public nlohmann::detail::json_sax_dom_parser<json>\n{\n  public:\n    sax_no_exception(json& j)\n      : nlohmann::detail::json_sax_dom_parser<json>(j, false)\n    {}\n\n    bool parse_error(std::size_t position,\n                     const std::string& last_token,\n                     const json::exception& ex)\n    {\n        std::cerr << \"parse error at input byte \" << position << \"\\n\"\n                  << ex.what() << \"\\n\"\n                  << \"last read: \\\"\" << last_token << \"\\\"\"\n                  << std::endl;\n        return false;\n    }\n};\n\nint main()\n{\n    std::string myinput = \"[1,2,3,]\";\n\n    json result;\n    sax_no_exception sax(result);\n\n    bool parse_result = json::sax_parse(myinput, &sax);\n    if (!parse_result)\n    {\n        std::cerr << \"parsing unsuccessful!\" << std::endl;\n    }\n\n    std::cout << \"parsed value: \" << result << std::endl;\n}\n

    Output:

    parse error at input byte 8\n[json.exception.parse_error.101] parse error at line 1, column 8: syntax error while parsing value - unexpected ']'; expected '[', '{', or a literal\nlast read: \"3,]\"\nparsing unsuccessful!\nparsed value: [1,2,3]\n
    "},{"location":"features/parsing/parser_callbacks/","title":"Parser Callbacks","text":""},{"location":"features/parsing/parser_callbacks/#overview","title":"Overview","text":"

    With a parser callback function, the result of parsing a JSON text can be influenced. When passed to parse, it is called on certain events (passed as parse_event_t via parameter event) with a set recursion depth depth and context JSON value parsed. The return value of the callback function is a boolean indicating whether the element that emitted the callback shall be kept or not.

    The type of the callback function is:

    template<typename BasicJsonType>\nusing parser_callback_t =\n    std::function<bool(int depth, parse_event_t event, BasicJsonType& parsed)>;\n
    "},{"location":"features/parsing/parser_callbacks/#callback-event-types","title":"Callback event types","text":"

    We distinguish six scenarios (determined by the event type) in which the callback function can be called. The following table describes the values of the parameters depth, event, and parsed.

    parameter event description parameter depth parameter parsed parse_event_t::object_start the parser read { and started to process a JSON object depth of the parent of the JSON object a JSON value with type discarded parse_event_t::key the parser read a key of a value in an object depth of the currently parsed JSON object a JSON string containing the key parse_event_t::object_end the parser read } and finished processing a JSON object depth of the parent of the JSON object the parsed JSON object parse_event_t::array_start the parser read [ and started to process a JSON array depth of the parent of the JSON array a JSON value with type discarded parse_event_t::array_end the parser read ] and finished processing a JSON array depth of the parent of the JSON array the parsed JSON array parse_event_t::value the parser finished reading a JSON value depth of the value the parsed JSON value Example

    When parsing the following JSON text,

    {\n    \"name\": \"Berlin\",\n    \"location\": [\n        52.519444,\n        13.406667\n    ]\n}\n

    these calls are made to the callback function:

    event depth parsed object_start 0 discarded key 1 \"name\" value 1 \"Berlin\" key 1 \"location\" array_start 1 discarded value 2 52.519444 value 2 13.406667 array_end 1 [52.519444,13.406667] object_end 0 {\"location\":[52.519444,13.406667],\"name\":\"Berlin\"}"},{"location":"features/parsing/parser_callbacks/#return-value","title":"Return value","text":"

    Discarding a value (i.e., returning false) has different effects depending on the context in which the function was called:

    • Discarded values in structured types are skipped. That is, the parser will behave as if the discarded value was never read.
    • In case a value outside a structured type is skipped, it is replaced with null. This case happens if the top-level element is skipped.
    Example

    The example below demonstrates the parse() function with and without callback function.

    #include <iostream>\n#include <iomanip>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    // a JSON text\n    auto text = R\"(\n    {\n        \"Image\": {\n            \"Width\":  800,\n            \"Height\": 600,\n            \"Title\":  \"View from 15th Floor\",\n            \"Thumbnail\": {\n                \"Url\":    \"http://www.example.com/image/481989943\",\n                \"Height\": 125,\n                \"Width\":  100\n            },\n            \"Animated\" : false,\n            \"IDs\": [116, 943, 234, 38793]\n        }\n    }\n    )\";\n\n    // parse and serialize JSON\n    json j_complete = json::parse(text);\n    std::cout << std::setw(4) << j_complete << \"\\n\\n\";\n\n    // define parser callback\n    json::parser_callback_t cb = [](int depth, json::parse_event_t event, json & parsed)\n    {\n        // skip object elements with key \"Thumbnail\"\n        if (event == json::parse_event_t::key and parsed == json(\"Thumbnail\"))\n        {\n            return false;\n        }\n        else\n        {\n            return true;\n        }\n    };\n\n    // parse (with callback) and serialize JSON\n    json j_filtered = json::parse(text, cb);\n    std::cout << std::setw(4) << j_filtered << '\\n';\n}\n

    Output:

    {\n    \"Image\": {\n        \"Animated\": false,\n        \"Height\": 600,\n        \"IDs\": [\n            116,\n            943,\n            234,\n            38793\n        ],\n        \"Thumbnail\": {\n            \"Height\": 125,\n            \"Url\": \"http://www.example.com/image/481989943\",\n            \"Width\": 100\n        },\n        \"Title\": \"View from 15th Floor\",\n        \"Width\": 800\n    }\n}\n\n{\n    \"Image\": {\n        \"Animated\": false,\n        \"Height\": 600,\n        \"IDs\": [\n            116,\n            943,\n            234,\n            38793\n        ],\n        \"Title\": \"View from 15th Floor\",\n        \"Width\": 800\n    }\n}\n
    "},{"location":"features/parsing/sax_interface/","title":"SAX Interface","text":"

    The library uses a SAX-like interface with the following functions:

    classDiagram\n\nclass sax_t [\"json::sax_t\"] {\n    <<interface>>\n    +bool null()*\n\n    +bool boolean(bool val)*\n\n    +bool number_integer(number_integer_t val)*\n    +bool number_unsigned(number_unsigned_t val)*\n\n    +bool number_float(number_float_t val, const string_t& s)*\n\n    +bool string(string_t& val)*\n    +bool binary(binary_t& val)*\n\n    +bool start_object(std::size_t elements)*\n    +bool end_object()*\n    +bool start_array(std::size_t elements)*\n    +bool end_array()*\n    +bool key(string_t& val)*\n\n    +bool parse_error(std::size_t position, const std::string& last_token, const json::exception& ex)*\n}
    // called when null is parsed\nbool null();\n\n// called when a boolean is parsed; value is passed\nbool boolean(bool val);\n\n// called when a signed or unsigned integer number is parsed; value is passed\nbool number_integer(number_integer_t val);\nbool number_unsigned(number_unsigned_t val);\n\n// called when a floating-point number is parsed; value and original string is passed\nbool number_float(number_float_t val, const string_t& s);\n\n// called when a string is parsed; value is passed and can be safely moved away\nbool string(string_t& val);\n// called when a binary value is parsed; value is passed and can be safely moved away\nbool binary(binary_t& val);\n\n// called when an object or array begins or ends, resp. The number of elements is passed (or -1 if not known)\nbool start_object(std::size_t elements);\nbool end_object();\nbool start_array(std::size_t elements);\nbool end_array();\n// called when an object key is parsed; value is passed and can be safely moved away\nbool key(string_t& val);\n\n// called when a parse error occurs; byte position, the last token, and an exception is passed\nbool parse_error(std::size_t position, const std::string& last_token, const json::exception& ex);\n

    The return value of each function determines whether parsing should proceed.

    To implement your own SAX handler, proceed as follows:

    1. Implement the SAX interface in a class. You can use class nlohmann::json_sax<json> as base class, but you can also use any class where the functions described above are implemented and public.
    2. Create an object of your SAX interface class, e.g. my_sax.
    3. Call bool json::sax_parse(input, &my_sax); where the first parameter can be any input like a string or an input stream and the second parameter is a pointer to your SAX interface.

    Note the sax_parse function only returns a bool indicating the result of the last executed SAX event. It does not return json value - it is up to you to decide what to do with the SAX events. Furthermore, no exceptions are thrown in case of a parse error - it is up to you what to do with the exception object passed to your parse_error implementation. Internally, the SAX interface is used for the DOM parser (class json_sax_dom_parser) as well as the acceptor (json_sax_acceptor), see file json_sax.hpp.

    "},{"location":"features/parsing/sax_interface/#see-also","title":"See also","text":"
    • json_sax - documentation of the SAX interface
    • sax_parse - SAX parser
    "},{"location":"features/types/","title":"Types","text":"

    This page gives an overview of how JSON values are stored and how this can be configured.

    "},{"location":"features/types/#overview","title":"Overview","text":"

    By default, JSON values are stored as follows:

    JSON type C++ type object std::map<std::string, basic_json> array std::vector<basic_json> null std::nullptr_t string std::string boolean bool number std::int64_t, std::uint64_t, and double

    Note there are three different types for numbers - when parsing JSON text, the best fitting type is chosen.

    "},{"location":"features/types/#storage","title":"Storage","text":"
    classDiagram\n\nclass value_t {\n    <<enumeration>>\n    null\n    object\n    array\n    string\n    boolean\n    number_integer\n    number_unsigned\n    number_float\n    binary\n    discarded\n}\n\nclass json_value {\n    <<union>>\n    object_t* object\n    array_t* array\n    string_t* string\n    binary_t* binary\n    boolean_t boolean\n    number_integer_t number_integer\n    number_unsigned_t number_unsigned\n    number_float_t number_float\n}\n\nclass basic_json {\n    -value_t m_type\n    -json_value m_value\n    +typedef object_t\n    +typedef array_t\n    +typedef binary_t\n    +typedef boolean_t\n    +typedef number_integer_t\n    +typedef number_unsigned_t\n    +typedef number_float_t\n}\n\nbasic_json .. json_value\nbasic_json .. value_t
    "},{"location":"features/types/#template-arguments","title":"Template arguments","text":"

    The data types to store a JSON value are derived from the template arguments passed to class basic_json:

    template<\n    template<typename U, typename V, typename... Args> class ObjectType = std::map,\n    template<typename U, typename... Args> class ArrayType = std::vector,\n    class StringType = std::string,\n    class BooleanType = bool,\n    class NumberIntegerType = std::int64_t,\n    class NumberUnsignedType = std::uint64_t,\n    class NumberFloatType = double,\n    template<typename U> class AllocatorType = std::allocator,\n    template<typename T, typename SFINAE = void> class JSONSerializer = adl_serializer,\n    class BinaryType = std::vector<std::uint8_t>\n>\nclass basic_json;\n

    Type json is an alias for basic_json<> and uses the default types.

    From the template arguments, the following types are derived:

    using object_comparator_t = std::less<>;\nusing object_t = ObjectType<StringType, basic_json, object_comparator_t,\n                   AllocatorType<std::pair<const StringType, basic_json>>>;\n\nusing array_t = ArrayType<basic_json, AllocatorType<basic_json>>;\n\nusing string_t = StringType;\n\nusing boolean_t = BooleanType;\n\nusing number_integer_t = NumberIntegerType;\nusing number_unsigned_t = NumberUnsignedType;\nusing number_float_t = NumberFloatType;\n\nusing binary_t = nlohmann::byte_container_with_subtype<BinaryType>;\n
    "},{"location":"features/types/#objects","title":"Objects","text":"

    RFC 8259 describes JSON objects as follows:

    An object is an unordered collection of zero or more name/value pairs, where a name is a string and a value is a string, number, boolean, null, object, or array.

    "},{"location":"features/types/#default-type","title":"Default type","text":"

    With the default values for ObjectType (std::map), StringType (std::string), and AllocatorType (std::allocator), the default value for object_t is:

    std::map<\n  std::string, // key_type\n  basic_json, // value_type\n  std::less<>, // key_compare\n  std::allocator<std::pair<const std::string, basic_json>> // allocator_type\n>\n
    "},{"location":"features/types/#behavior","title":"Behavior","text":"

    The choice of object_t influences the behavior of the JSON class. With the default type, objects have the following behavior:

    • When all names are unique, objects will be interoperable in the sense that all software implementations receiving that object will agree on the name-value mappings.
    • When the names within an object are not unique, it is unspecified which one of the values for a given key will be chosen. For instance, {\"key\": 2, \"key\": 1} could be equal to either {\"key\": 1} or {\"key\": 2}.
    • Internally, name/value pairs are stored in lexicographical order of the names. Objects will also be serialized (see dump) in this order. For instance, both {\"b\": 1, \"a\": 2} and {\"a\": 2, \"b\": 1} will be stored and serialized as {\"a\": 2, \"b\": 1}.
    • When comparing objects, the order of the name/value pairs is irrelevant. This makes objects interoperable in the sense that they will not be affected by these differences. For instance, {\"b\": 1, \"a\": 2} and {\"a\": 2, \"b\": 1} will be treated as equal.
    "},{"location":"features/types/#key-order","title":"Key order","text":"

    The order name/value pairs are added to the object are not preserved by the library. Therefore, iterating an object may return name/value pairs in a different order than they were originally stored. In fact, keys will be traversed in alphabetical order as std::map with std::less is used by default. Please note this behavior conforms to RFC 8259, because any order implements the specified \"unordered\" nature of JSON objects.

    "},{"location":"features/types/#limits","title":"Limits","text":"

    RFC 8259 specifies:

    An implementation may set limits on the maximum depth of nesting.

    In this class, the object's limit of nesting is not explicitly constrained. However, a maximum depth of nesting may be introduced by the compiler or runtime environment. A theoretical limit can be queried by calling the max_size function of a JSON object.

    "},{"location":"features/types/#storage_1","title":"Storage","text":"

    Objects are stored as pointers in a basic_json type. That is, for any access to object values, a pointer of type object_t* must be dereferenced.

    "},{"location":"features/types/#arrays","title":"Arrays","text":"

    RFC 8259 describes JSON arrays as follows:

    An array is an ordered sequence of zero or more values.

    "},{"location":"features/types/#default-type_1","title":"Default type","text":"

    With the default values for ArrayType (std::vector) and AllocatorType (std::allocator), the default value for array_t is:

    std::vector<\n  basic_json, // value_type\n  std::allocator<basic_json> // allocator_type\n>\n
    "},{"location":"features/types/#limits_1","title":"Limits","text":"

    RFC 8259 specifies:

    An implementation may set limits on the maximum depth of nesting.

    In this class, the array's limit of nesting is not explicitly constrained. However, a maximum depth of nesting may be introduced by the compiler or runtime environment. A theoretical limit can be queried by calling the max_size function of a JSON array.

    "},{"location":"features/types/#storage_2","title":"Storage","text":"

    Arrays are stored as pointers in a basic_json type. That is, for any access to array values, a pointer of type array_t* must be dereferenced.

    "},{"location":"features/types/#strings","title":"Strings","text":"

    RFC 8259 describes JSON strings as follows:

    A string is a sequence of zero or more Unicode characters.

    Unicode values are split by the JSON class into byte-sized characters during deserialization.

    "},{"location":"features/types/#default-type_2","title":"Default type","text":"

    With the default values for StringType (std::string), the default value for string_t is std::string.

    "},{"location":"features/types/#encoding","title":"Encoding","text":"

    Strings are stored in UTF-8 encoding. Therefore, functions like std::string::size() or std::string::length() return the number of bytes in the string rather than the number of characters or glyphs.

    "},{"location":"features/types/#string-comparison","title":"String comparison","text":"

    RFC 8259 states:

    Software implementations are typically required to test names of object members for equality. Implementations that transform the textual representation into sequences of Unicode code units and then perform the comparison numerically, code unit by code unit are interoperable in the sense that implementations will agree in all cases on equality or inequality of two strings. For example, implementations that compare strings with escaped characters unconverted may incorrectly find that \"a\\\\b\" and \"a\\u005Cb\" are not equal.

    This implementation is interoperable as it does compare strings code unit by code unit.

    "},{"location":"features/types/#storage_3","title":"Storage","text":"

    String values are stored as pointers in a basic_json type. That is, for any access to string values, a pointer of type string_t* must be dereferenced.

    "},{"location":"features/types/#booleans","title":"Booleans","text":"

    RFC 8259 implicitly describes a boolean as a type which differentiates the two literals true and false.

    "},{"location":"features/types/#default-type_3","title":"Default type","text":"

    With the default values for BooleanType (bool), the default value for boolean_t is bool.

    "},{"location":"features/types/#storage_4","title":"Storage","text":"

    Boolean values are stored directly inside a basic_json type.

    "},{"location":"features/types/#numbers","title":"Numbers","text":"

    See the number handling article for a detailed discussion on how numbers are handled by this library.

    RFC 8259 describes numbers as follows:

    The representation of numbers is similar to that used in most programming languages. A number is represented in base 10 using decimal digits. It contains an integer component that may be prefixed with an optional minus sign, which may be followed by a fraction part and/or an exponent part. Leading zeros are not allowed. (...) Numeric values that cannot be represented in the grammar below (such as Infinity and NaN) are not permitted.

    This description includes both integer and floating-point numbers. However, C++ allows more precise storage if it is known whether the number is a signed integer, an unsigned integer, or a floating-point number. Therefore, three different types, number_integer_t, number_unsigned_t, and number_float_t are used.

    "},{"location":"features/types/#default-types","title":"Default types","text":"

    With the default values for NumberIntegerType (std::int64_t), the default value for number_integer_t is std::int64_t. With the default values for NumberUnsignedType (std::uint64_t), the default value for number_unsigned_t is std::uint64_t. With the default values for NumberFloatType (double), the default value for number_float_t is double.

    "},{"location":"features/types/#default-behavior","title":"Default behavior","text":"
    • The restrictions about leading zeros are not enforced in C++. Instead, leading zeros in integer literals lead to an interpretation as an octal number. Internally, the value will be stored as a decimal number. For instance, the C++ integer literal 010 will be serialized to 8. During deserialization, leading zeros yield an error.
    • Not-a-number (NaN) values will be serialized to null.
    "},{"location":"features/types/#limits_2","title":"Limits","text":"

    RFC 8259 specifies:

    An implementation may set limits on the range and precision of numbers.

    When the default type is used, the maximal integer number that can be stored is 9223372036854775807 (INT64_MAX) and the minimal integer number that can be stored is -9223372036854775808 (INT64_MIN). Integer numbers that are out of range will yield over/underflow when used in a constructor. During deserialization, too large or small integer numbers will automatically be stored as number_unsigned_t or number_float_t.

    When the default type is used, the maximal unsigned integer number that can be stored is 18446744073709551615 (UINT64_MAX) and the minimal integer number that can be stored is 0. Integer numbers that are out of range will yield over/underflow when used in a constructor. During deserialization, too large or small integer numbers will automatically be stored as number_integer_t or number_float_t.

    RFC 8259 further states:

    Note that when such software is used, numbers that are integers and are in the range [-2^{53}+1, 2^{53}-1] are interoperable in the sense that implementations will agree exactly on their numeric values.

    As this range is a subrange of the exactly supported range [INT64_MIN, INT64_MAX], this class's integer type is interoperable.

    RFC 8259 states:

    This specification allows implementations to set limits on the range and precision of numbers accepted. Since software that implements IEEE 754-2008 binary64 (double precision) numbers is generally available and widely used, good interoperability can be achieved by implementations that expect no more precision or range than these provide, in the sense that implementations will approximate JSON numbers within the expected precision.

    This implementation does exactly follow this approach, as it uses double precision floating-point numbers. Note values smaller than -1.79769313486232e+308 and values greater than 1.79769313486232e+308 will be stored as NaN internally and be serialized to null.

    "},{"location":"features/types/#storage_5","title":"Storage","text":"

    Integer number values, unsigned integer number values, and floating-point number values are stored directly inside a basic_json type.

    "},{"location":"features/types/number_handling/","title":"Number Handling","text":"

    This document describes how the library is handling numbers.

    "},{"location":"features/types/number_handling/#background","title":"Background","text":"

    This section briefly summarizes how the JSON specification describes how numbers should be handled.

    "},{"location":"features/types/number_handling/#json-number-syntax","title":"JSON number syntax","text":"

    JSON defines the syntax of numbers as follows:

    RFC 8259, Section 6

    The representation of numbers is similar to that used in most programming languages. A number is represented in base 10 using decimal digits. It contains an integer component that may be prefixed with an optional minus sign, which may be followed by a fraction part and/or an exponent part. Leading zeros are not allowed.

    A fraction part is a decimal point followed by one or more digits.

    An exponent part begins with the letter E in uppercase or lowercase, which may be followed by a plus or minus sign. The E and optional sign are followed by one or more digits.

    The following railroad diagram from json.org visualizes the number syntax:

    "},{"location":"features/types/number_handling/#number-interoperability","title":"Number interoperability","text":"

    On number interoperability, the following remarks are made:

    RFC 8259, Section 6

    This specification allows implementations to set limits on the range and precision of numbers accepted. Since software that implements IEEE 754 binary64 (double precision) numbers [IEEE754] is generally available and widely used, good interoperability can be achieved by implementations that expect no more precision or range than these provide, in the sense that implementations will approximate JSON numbers within the expected precision. A JSON number such as 1E400 or 3.141592653589793238462643383279 may indicate potential interoperability problems, since it suggests that the software that created it expects receiving software to have greater capabilities for numeric magnitude and precision than is widely available.

    Note that when such software is used, numbers that are integers and are in the range [-2^{53}+1, 2^{53}-1] are interoperable in the sense that implementations will agree exactly on their numeric values.

    "},{"location":"features/types/number_handling/#library-implementation","title":"Library implementation","text":"

    This section describes how this library implements the above number specification.

    "},{"location":"features/types/number_handling/#number-storage","title":"Number storage","text":"

    In the default json type, numbers are stored as std::uint64_t, std::int64_t, and double, respectively. Thereby, std::uint64_t and std::int64_t are used only if they can store the number without loss of precision. If this is impossible (e.g., if the number is too large), the number is stored as double.

    Notes

    • Numbers with a decimal digit or scientific notation are always stored as double.
    • The number types can be changed, see Template number types.
    • As of version 3.9.1, the conversion is realized by std::strtoull, std::strtoll, and std::strtod, respectively.

    Examples

    • Integer -12345678912345789123456789 is smaller than INT64_MIN and will be stored as floating-point number -1.2345678912345788e+25.
    • Integer 1E3 will be stored as floating-point number 1000.0.
    "},{"location":"features/types/number_handling/#number-limits","title":"Number limits","text":"
    • Any 64-bit signed or unsigned integer can be stored without loss of precision.
    • Numbers exceeding the limits of double (i.e., numbers that after conversion via std::strtod are not satisfying std::isfinite such as 1E400) will throw exception json.exception.out_of_range.406 during parsing.
    • Floating-point numbers are rounded to the next number representable as double. For instance 3.141592653589793238462643383279 is stored as 0x400921fb54442d18. This is the same behavior as the code double x = 3.141592653589793238462643383279;.

    Interoperability

    • The library interoperable with respect to the specification, because its supported range [-2^{63}, 2^{64}-1] is larger than the described range [-2^{53}+1, 2^{53}-1].
    • All integers outside the range [-2^{63}, 2^{64}-1], as well as floating-point numbers are stored as double. This also concurs with the specification above.
    "},{"location":"features/types/number_handling/#zeros","title":"Zeros","text":"

    The JSON number grammar allows for different ways to express zero, and this library will store zeros differently:

    Literal Stored value and type Serialization 0 std::uint64_t(0) 0 -0 std::int64_t(0) 0 0.0 double(0.0) 0.0 -0.0 double(-0.0) -0.0 0E0 double(0.0) 0.0 -0E0 double(-0.0) -0.0

    That is, -0 is stored as a signed integer, but the serialization does not reproduce the -.

    "},{"location":"features/types/number_handling/#number-serialization","title":"Number serialization","text":"
    • Integer numbers are serialized as is; that is, no scientific notation is used.
    • Floating-point numbers are serialized as specified by the %g printf modifier with std::numeric_limits<double>::max_digits10 significant digits. The rationale is to use the shortest representation while still allowing round-tripping.

    Notes regarding precision of floating-point numbers

    As described above, floating-point numbers are rounded to the nearest double and serialized with the shortest representation to allow round-tripping. This can yield confusing examples:

    • The serialization can have fewer decimal places than the input: 2555.5599999999999 will be serialized as 2555.56. The reverse can also be true.
    • The serialization can be in scientific notation even if the input is not: 0.0000972439793401814 will be serialized as 9.72439793401814e-05. The reverse can also be true: 12345E-5 will be serialized as 0.12345.
    • Conversions from float to double can also introduce rounding errors: 
      float f = 0.3;\njson j = f;\nstd::cout << j << '\\n';\n
      yields 0.30000001192092896.

    All examples here can be reproduced by passing the original double value to

    std::printf(\"%.*g\\n\", std::numeric_limits<double>::max_digits10, double_value);\n
    "},{"location":"features/types/number_handling/#nan-handling","title":"NaN handling","text":"

    NaN (not-a-number) cannot be expressed with the number syntax described above and are in fact explicitly excluded:

    RFC 8259, Section 6

    Numeric values that cannot be represented in the grammar below (such as Infinity and NaN) are not permitted.

    That is, there is no way to parse a NaN value. However, assignments can store NaN values in a JSON value.

    This library serializes NaN values as null. This corresponds to the behavior of JavaScript's JSON.stringify function.

    Example

    The following example shows how a NaN value is stored in a json value.

    int main()\n{\n    double val = std::numeric_limits<double>::quiet_NaN();\n    std::cout << \"val=\" << val << std::endl;\n    json j = val;\n    std::cout << \"j=\" << j.dump() << std::endl;\n    val = j;\n    std::cout << \"val=\" << val << std::endl;\n}\n

    output:

    val=nan\nj=null\nval=nan\n
    "},{"location":"features/types/number_handling/#number-comparison","title":"Number comparison","text":"

    Floating-point inside JSON values numbers are compared with json::number_float_t::operator== which is double::operator== by default.

    Alternative comparison functions

    To compare floating-point while respecting an epsilon, an alternative comparison function could be used, for instance

    template<typename T, typename = typename std::enable_if<std::is_floating_point<T>::value, T>::type>\ninline bool is_same(T a, T b, T epsilon = std::numeric_limits<T>::epsilon()) noexcept\n{\n    return std::abs(a - b) <= epsilon;\n}\n
    Or you can self-define an operator equal function like this:

    bool my_equal(const_reference lhs, const_reference rhs)\n{\n    const auto lhs_type lhs.type();\n    const auto rhs_type rhs.type();\n    if (lhs_type == rhs_type)\n    {\n        switch(lhs_type)\n        {\n            // self_defined case\n            case value_t::number_float:\n                return std::abs(lhs - rhs) <= std::numeric_limits<float>::epsilon();\n\n            // other cases remain the same with the original\n            ...\n        }\n    }\n    ...\n}\n

    (see #703 for more information.)

    Note

    NaN values never compare equal to themselves or to other NaN values. See #514.

    "},{"location":"features/types/number_handling/#number-conversion","title":"Number conversion","text":"

    Just like the C++ language itself, the get family of functions allows conversions between unsigned and signed integers, and between integers and floating-point values to integers. This behavior may be surprising.

    Unconditional number conversions

    double d = 42.3;                                   // non-integer double value 42.3\njson jd = d;                                       // stores double value 42.3\nstd::int64_t i = jd.template get<std::int64_t>();  // now i==42; no warning or error is produced\n

    Note the last line with throw a json.exception.type_error.302 exception if jd is not a numerical type, for instance a string.

    The rationale is twofold:

    1. JSON does not define a number type or precision (see above).
    2. C++ also allows silently converting between number types.

    Conditional number conversion

    The code above can be solved by explicitly checking the nature of the value with members such as is_number_integer() or is_number_unsigned():

    // check if jd is really integer-valued\nif (jd.is_number_integer())\n{\n    // if so, do the conversion and use i\n    std::int64_t i = jd.template get<std::int64_t>();\n    // ...\n}\nelse\n{\n    // otherwise, take appropriate action\n    // ...\n}\n

    Note this approach also has the advantage that it can react on non-numerical JSON value types such as strings.

    (Example taken from #777.)

    "},{"location":"features/types/number_handling/#determine-number-types","title":"Determine number types","text":"

    As the example in Number conversion shows, there are different functions to determine the type of the stored number:

    • is_number() returns true for any number type
    • is_number_integer() returns true for signed and unsigned integers
    • is_number_unsigned() returns true for unsigned integers only
    • is_number_float() returns true for floating-point numbers
    • type_name() returns \"number\" for any number type
    • type() returns a different enumerator of value_t for all number types
    function unsigned integer signed integer floating-point string is_number() true true true false is_number_integer() true true false false is_number_unsigned() true false false false is_number_float() false false true false type_name() \"number\" \"number\" \"number\" \"string\" type() number_unsigned number_integer number_float string"},{"location":"features/types/number_handling/#template-number-types","title":"Template number types","text":"

    The number types can be changed with template parameters.

    position number type default type possible values 5 signed integers std::int64_t std::int32_t, std::int16_t, etc. 6 unsigned integers std::uint64_t std::uint32_t, std::uint16_t, etc. 7 floating-point double float, long double

    Constraints on number types

    • The type for signed integers must be convertible from long long. The type for floating-point numbers is used in case of overflow.
    • The type for unsigned integers must be convertible from unsigned long long. The type for floating-point numbers is used in case of overflow.
    • The types for signed and unsigned integers must be distinct, see #2573.
    • Only double, float, and long double are supported for floating-point numbers.

    Example

    A basic_json type that uses long double as floating-point type.

    using json_ld = nlohmann::basic_json<std::map, std::vector, std::string, bool,\n                                     std::int64_t, std::uint64_t, long double>;\n

    Note values should then be parsed with json_ld::parse rather than json::parse as the latter would parse floating-point values to double before then converting them to long double.

    "},{"location":"home/architecture/","title":"Architecture","text":"

    Info

    This page is still under construction. Its goal is to provide a high-level overview of the library's architecture. This should help new contributors to get an idea of the used concepts and where to make changes.

    "},{"location":"home/architecture/#overview","title":"Overview","text":"

    The main structure is class nlohmann::basic_json.

    • public API
    • container interface
    • iterators
    "},{"location":"home/architecture/#template-specializations","title":"Template specializations","text":"
    • describe template parameters of basic_json
    • json
    • ordered_json via ordered_map
    "},{"location":"home/architecture/#value-storage","title":"Value storage","text":"

    Values are stored as a tagged union of value_t and json_value.

    /// the type of the current element\nvalue_t m_type = value_t::null;\n\n/// the value of the current element\njson_value m_value = {};\n

    with

    enum class value_t : std::uint8_t\n{\n    null,             ///< null value\n    object,           ///< object (unordered set of name/value pairs)\n    array,            ///< array (ordered collection of values)\n    string,           ///< string value\n    boolean,          ///< boolean value\n    number_integer,   ///< number value (signed integer)\n    number_unsigned,  ///< number value (unsigned integer)\n    number_float,     ///< number value (floating-point)\n    binary,           ///< binary array (ordered collection of bytes)\n    discarded         ///< discarded by the parser callback function\n};\n\nunion json_value {\n  /// object (stored with pointer to save storage)\n  object_t *object;\n  /// array (stored with pointer to save storage)\n  array_t *array;\n  /// string (stored with pointer to save storage)\n  string_t *string;\n  /// binary (stored with pointer to save storage)\n  binary_t *binary;\n  /// boolean\n  boolean_t boolean;\n  /// number (integer)\n  number_integer_t number_integer;\n  /// number (unsigned integer)\n  number_unsigned_t number_unsigned;\n  /// number (floating-point)\n  number_float_t number_float;\n};\n
    "},{"location":"home/architecture/#parsing-inputs-deserialization","title":"Parsing inputs (deserialization)","text":"

    Input is read via input adapters that abstract a source with a common interface:

    /// read a single character\nstd::char_traits<char>::int_type get_character() noexcept;\n\n/// read multiple characters to a destination buffer and\n/// returns the number of characters successfully read\ntemplate<class T>\nstd::size_t get_elements(T* dest, std::size_t count = 1);\n

    List examples of input adapters.

    "},{"location":"home/architecture/#sax-interface","title":"SAX Interface","text":"

    TODO

    "},{"location":"home/architecture/#writing-outputs-serialization","title":"Writing outputs (serialization)","text":"

    Output is written via output adapters:

    template<typename T>\nvoid write_character(CharType c);\n\ntemplate<typename CharType>\nvoid write_characters(const CharType* s, std::size_t length);\n

    List examples of output adapters.

    "},{"location":"home/architecture/#value-conversion","title":"Value conversion","text":"
    template<class T>\nvoid to_json(basic_json& j, const T& t);\n\ntemplate<class T>\nvoid from_json(const basic_json& j, T& t);\n
    "},{"location":"home/architecture/#additional-features","title":"Additional features","text":"
    • JSON Pointers
    • Binary formats
    • Custom base class
    • Conversion macros
    "},{"location":"home/architecture/#details-namespace","title":"Details namespace","text":"
    • C++ feature backports
    "},{"location":"home/customers/","title":"Customers","text":"

    The library is used in multiple projects, applications, operating systems, etc. The list below is not exhaustive, but the result of an internet search. If you know further customers of the library, please let me know.

    "},{"location":"home/customers/#space-exploration","title":"Space Exploration","text":"
    • Peregrine Lunar Lander Flight 01 - The library was used for payload management in the Peregrine Moon Lander, developed by Astrobotic Technology and launched as part of NASA's Commercial Lunar Payload Services (CLPS) program. After six days in orbit, the spacecraft was intentionally redirected into Earth's atmosphere, where it burned up over the Pacific Ocean on January 18, 2024.
    "},{"location":"home/customers/#automotive","title":"Automotive","text":"
    • Alexa Auto SDK, a software development kit enabling the integration of Alexa into automotive systems
    • Apollo, a framework for building autonomous driving systems
    • Automotive Grade Linux (AGL), a collaborative open-source platform for automotive software development
    • Genesis Motor (infotainment), a luxury automotive brand
    • Hyundai (infotainment), a global automotive brand
    • Kia (infotainment), a global automotive brand
    • Mercedes-Benz Operating System (MB.OS), a core component of the vehicle software ecosystem from Mercedes-Benz
    • Rivian (infotainment), an electric vehicle manufacturer
    • Suzuki (infotainment), a global automotive and motorcycle manufacturer
    "},{"location":"home/customers/#gaming-and-entertainment","title":"Gaming and Entertainment","text":"
    • Assassin's Creed: Mirage, a stealth-action game set in the Middle East, focusing on the journey of a young assassin with classic parkour and stealth mechanics
    • Chasm: The Rift, a first-person shooter blending horror and adventure, where players navigate dark realms and battle monsters
    • College Football 25, a college football simulation game featuring gameplay that mimics real-life college teams and competitions
    • Concepts, a digital sketching app designed for creative professionals, offering flexible drawing tools for illustration, design, and brainstorming
    • Depthkit, a tool for creating and capturing volumetric video, enabling immersive 3D experiences and interactive content
    • IMG.LY, a platform offering creative tools and SDKs for integrating advanced image and video editing in applications
    • LOOT, a tool for optimizing the load order of game plugins, commonly used in The Elder Scrolls and Fallout series
    • Madden NFL 25, a sports simulation game capturing the excitement of American football with realistic gameplay and team management features
    • Marne, an unofficial private server platform for hosting custom Battlefield 1 game experiences
    • Minecraft, a popular sandbox video game
    • NHL 22, a hockey simulation game offering realistic gameplay, team management, and various modes to enhance the hockey experience
    • Pixelpart, a 2D animation and video compositing software that allows users to create animated graphics and visual effects with a focus on simplicity and ease of use
    • Razer Cortex, a gaming performance optimizer and system booster designed to enhance the gaming experience
    • Red Dead Redemption II, an open-world action-adventure game following an outlaw's story in the late 1800s, emphasizing deep storytelling and immersive gameplay
    • Snapchat, a multimedia messaging and augmented reality app for communication and entertainment
    • Tactics Ogre: Reborn, a tactical role-playing game featuring strategic battles and deep storytelling elements
    • Throne and Liberty, an MMORPG that offers an expansive fantasy world with dynamic gameplay and immersive storytelling
    • Unity Vivox, a communication service that enables voice and text chat functionality in multiplayer games developed with Unity
    • Zool: Redimensioned, a modern reimagining of the classic platformer featuring fast-paced gameplay and vibrant environments
    • immersivetech, a technology company focused on immersive experiences, providing tools and solutions for virtual and augmented reality applications
    "},{"location":"home/customers/#consumer-electronics","title":"Consumer Electronics","text":"
    • Audinate, a provider of networked audio solutions specializing in Dante technology, which facilitates high-quality digital audio transport over IP networks
    • Canon CanoScan LIDE, a series of flatbed scanners offering high-resolution image scanning for home and office use
    • Canon PIXMA Printers, a line of all-in-one inkjet printers known for high-quality printing and wireless connectivity
    • Cisco Webex Desk Camera, a video camera designed for professional-quality video conferencing and remote collaboration
    • Philips Hue Personal Wireless Lighting, a smart lighting system for customizable and wireless home illumination
    • Ray-Ban Meta Smart glasses, a pair of smart glasses designed for capturing photos and videos with integrated connectivity and social features
    • Razer Synapse, a unified configuration software enabling hardware customization for Razer devices
    • Siemens SINEMA Remote Connect, a remote connectivity solution for monitoring and managing industrial networks and devices securely
    • Sony PlayStation 4, a gaming console developed by Sony that offers a wide range of games and multimedia entertainment features
    • Sony Virtual Webcam Driver for Remote Camera, a software driver that enables the use of Sony cameras as virtual webcams for video conferencing and streaming
    "},{"location":"home/customers/#operating-systems","title":"Operating Systems","text":"
    • Apple iOS and macOS, a family of operating systems developed by Apple, including iOS for mobile devices and macOS for desktop computers
    • Google Fuchsia, an open-source operating system developed by Google, designed to be secure, updatable, and adaptable across various devices
    • SerenityOS, an open-source operating system that aims to provide a simple and beautiful user experience with a focus on simplicity and elegance
    • Yocto, a Linux-based build system for creating custom operating systems and software distributions, tailored for embedded devices and IoT applications
    "},{"location":"home/customers/#development-tools-and-ides","title":"Development Tools and IDEs","text":"
    • Accentize SpectralBalance, an adaptive speech analysis tool designed to enhance audio quality by optimizing frequency balance in recordings
    • Arm Compiler for Linux, a software development toolchain for compiling and optimizing applications on Arm-based Linux systems
    • BBEdit, a professional text and code editor for macOS
    • CoderPad, a collaborative coding platform that enables real-time code interviews and assessments for developers; the library is included in every CoderPad instance and can be accessed with a simple #include \"json.hpp\"
    • Compiler Explorer, a web-based tool that allows users to write, compile, and visualize the assembly output of code in various programming languages; the library is readily available and accessible with the directive #include <nlohmann/json.hpp>.
    • GitHub CodeQL, a code analysis tool used for identifying security vulnerabilities and bugs in software through semantic queries
    • Hex-Rays, a reverse engineering toolset for analyzing and decompiling binaries, primarily used for security research and vulnerability analysis
    • ImHex, a hex editor designed for reverse engineering, providing advanced features for data analysis and manipulation
    • Intel GPA Framework, a suite of cross-platform tools for capturing, analyzing, and optimizing graphics applications across different APIs
    • Intopix, a provider of advanced image processing and compression solutions used in software development and AV workflows
    • MKVToolNix, a set of tools for creating, editing, and inspecting MKV (Matroska) multimedia container files
    • Meta Yoga, a layout engine that facilitates flexible and efficient user interface design across multiple platforms
    • NVIDIA Nsight Compute, a performance analysis tool for CUDA applications that provides detailed insights into GPU performance metrics
    • Notepad++, a free source code editor that supports various programming languages
    • OpenRGB, an open source RGB lighting control that doesn't depend on manufacturer software
    • OpenTelemetry C++, a library for collecting and exporting observability data in C++, enabling developers to implement distributed tracing and metrics in their application
    • Qt Creator, an IDE for developing applications using the Qt application framework
    • Scanbot SDK, a software development kit (SDK) that provides tools for integrating advanced document scanning and barcode scanning capabilities into applications
    "},{"location":"home/customers/#machine-learning-and-ai","title":"Machine Learning and AI","text":"
    • Apple Core ML Tools, a set of tools for converting and configuring machine learning models for deployment in Apple's Core ML framework
    • Avular Mobile Robotics, a platform for developing and deploying mobile robotics solutions
    • Google gemma.cpp, a lightweight C++ inference engine designed for running AI models from the Gemma family
    • llama.cpp, a C++ library designed for efficient inference of large language models (LLMs), enabling streamlined integration into applications
    • MLX, an array framework for machine learning on Apple Silicon
    • Mozilla llamafile, a tool designed for distributing and executing large language models (LLMs) efficiently using a single file format
    • NVIDIA ACE, a suite of real-time AI solutions designed for the development of interactive avatars and digital human applications, enabling scalable and sophisticated user interactions
    • Peer, a platform offering personalized AI assistants for interactive learning and creative collaboration
    • stable-diffusion.cpp, a C++ implementation of the Stable Diffusion image generation model
    • TanvasTouch, a software development kit (SDK) that enables developers to create tactile experiences on touchscreens, allowing users to feel textures and physical sensations in a digital environment
    • TensorFlow, a machine learning framework that facilitates the development and training of models, supporting data serialization and efficient data exchange between components
    "},{"location":"home/customers/#scientific-research-and-analysis","title":"Scientific Research and Analysis","text":"
    • BLACK, a bounded linear temporal logic (LTL) satisfiability checker
    • CERN Atlas Athena, a software framework used in the ATLAS experiment at the Large Hadron Collider (LHC) for performance monitoring
    • ICU, the International Components for Unicode, a mature library for software globalization and multilingual support
    • KAMERA, a platform for synchronized data collection and real-time deep learning to map marine species like polar bears and seals, aiding Arctic ecosystem research
    • KiCad, a free and open-source software suite for electronic design automation
    • Maple, a symbolic and numeric computing environment for advanced mathematical modeling and analysis
    • MeVisLab, a software framework for medical image processing and visualization.
    • OpenPMD API, a versatile programming interface for accessing and managing scientific data, designed to facilitate the efficient storage, retrieval, and sharing of simulation data across various applications and platforms
    • ParaView, an open-source tool for large-scale data visualization and analysis across various scientific domains
    • QGIS, a free and open-source geographic information system (GIS) application that allows users to create, edit, visualize, and analyze geospatial data across a variety of formats
    • VTK, a software library for 3D computer graphics, image processing, and visualization
    • VolView, a lightweight application for interactive visualization and analysis of 3D medical imaging data.
    "},{"location":"home/customers/#business-and-productivity-software","title":"Business and Productivity Software","text":"
    • ArcGIS PRO, a desktop geographic information system (GIS) application developed by Esri for mapping and spatial analysis
    • Autodesk Desktop, a software platform developed by Autodesk for creating and managing desktop applications and services
    • Check Point, a cybersecurity company specializing in threat prevention and network security solutions, offering a range of products designed to protect enterprises from cyber threats and ensure data integrity
    • Microsoft Office for Mac, a suite of productivity applications developed by Microsoft for macOS, including tools for word processing, spreadsheets, and presentations
    • Microsoft Teams, a team collaboration application offering workspace chat and video conferencing, file storage, and integration of proprietary and third-party applications and services
    • Nexthink Infinity, a digital employee experience management platform for monitoring and improving IT performance
    • Sophos Connect Client, a secure VPN client from Sophos that allows remote users to connect to their corporate network, ensuring secure access to resources and data
    • Stonebranch, a cloud-based cybersecurity solution that integrates backup, disaster recovery, and cybersecurity features to protect data and ensure business continuity for organizations
    • Tablecruncher, a data analysis tool that allows users to import, analyze, and visualize spreadsheet data, offering interactive features for better insights and decision-making
    • magicplan, a mobile application for creating floor plans and interior designs using augmented reality
    "},{"location":"home/customers/#databases-and-big-data","title":"Databases and Big Data","text":"
    • ADIOS2, a data management framework designed for high-performance input and output operations
    • Cribl Stream, a real-time data processing platform that enables organizations to collect, route, and transform observability data, enhancing visibility and insights into their systems
    • DB Browser for SQLite, a visual open-source tool for creating, designing, and editing SQLite database files
    • MySQL Connector/C++, a C++ library for connecting and interacting with MySQL databases
    • MySQL NDB Cluster, a distributed database system that provides high availability and scalability for MySQL databases
    • MySQL Shell, an advanced client and code editor for interacting with MySQL servers, supporting SQL, Python, and JavaScript
    • PrestoDB, a distributed SQL query engine designed for large-scale data analytics, originally developed by Facebook
    • ROOT Data Analysis Framework, an open-source data analysis framework widely used in high-energy physics and other fields for data processing and visualization
    • WiredTiger, a high-performance storage engine for databases, offering support for compression, concurrency, and checkpointing
    "},{"location":"home/customers/#simulation-and-modeling","title":"Simulation and Modeling","text":"
    • Arcturus HoloSuite, a software toolset for capturing, editing, and streaming volumetric video, featuring advanced compression technologies for high-quality 3D content creation
    • azul, a fast and efficient 3D city model viewer designed for visualizing urban environments and spatial data
    • Blender, a free and open-source 3D creation suite for modeling, animation, rendering, and more
    • cpplot, a library for creating interactive graphs and charts in C++, which can be viewed in web browsers
    • Foundry Nuke, a powerful node-based digital compositing and visual effects application used in film and television post-production
    • GAMS, a high-performance mathematical modeling system for optimization and decision support
    • Kitware SMTK, a software toolkit for managing simulation models and workflows in scientific and engineering applications
    • M-Star, a computational fluid dynamics software for simulating and analyzing fluid flow
    • MapleSim CAD Toolbox, a software extension for MapleSim that integrates CAD models, allowing users to import, manipulate, and analyze 3D CAD data within the MapleSim environment for enhanced modeling and simulation
    • NVIDIA Omniverse, a platform for 3D content creation and collaboration that enables real-time simulations and interactive experiences across various industries
    • Pixar Renderman, a photorealistic 3D rendering software developed by Pixar, widely used in the film industry for creating high-quality visual effects and animations
    • ROS - Robot Operating System, a set of software libraries and tools that assist in developing robot applications
    • UBS, a multinational financial services and banking company
    "},{"location":"home/customers/#enterprise-and-cloud-applications","title":"Enterprise and Cloud Applications","text":"
    • Acronis Cyber Protect Cloud, an all-in-one data protection solution that combines backup, disaster recovery, and cybersecurity to safeguard business data from threats like ransomware
    • Baereos, a backup solution that provides data protection and recovery options for various environments, including physical and virtual systems
    • Bitdefender Home Scanner, a tool from Bitdefender that scans devices for malware and security threats, providing a safeguard against potential online dangers
    • Citrix Provisioning, a solution that streamlines the delivery of virtual desktops and applications by allowing administrators to manage and provision resources efficiently across multiple environments
    • Citrix Virtual Apps and Desktops, a solution from Citrix that delivers virtual apps and desktops
    • Cyberarc, a security solution that specializes in privileged access management, enabling organizations to control and monitor access to critical systems and data, thereby enhancing overall cybersecurity posture
    • Egnyte Desktop, a secure cloud storage solution designed for businesses, enabling file sharing, collaboration, and data management across teams while ensuring compliance and data protection
    • Elster, a digital platform developed by German tax authorities for secure and efficient electronic tax filing and management using secunet protect4use
    • Ethereum Solidity, a high-level, object-oriented programming language designed for implementing smart contracts on the Ethereum platform
    • Inciga, a monitoring tool for IT infrastructure, designed to provide insights into system performance and availability through customizable dashboards and alerts
    • Intel Accelerator Management Daemon for VMware ESXi, a management tool designed for monitoring and controlling Intel hardware accelerators within VMware ESXi environments, optimizing performance and resource allocation
    • Juniper Identity Management Service
    • Microsoft Azure IoT SDK, a collection of tools and libraries to help developers connect, build, and deploy Internet of Things (IoT) solutions on the Azure cloud platform
    • Microsoft WinGet, a command-line utility included in the Windows Package Manager
    • plexusAV, a high-performance AV-over-IP transceiver device capable of video encoding and decoding using the IPMX standard
    • Pointr, a platform for indoor positioning and navigation solutions, offering tools and SDKs for developers to create location-based applications
    • secunet protect4use, a secure, passwordless multifactor authentication solution that transforms smartphones into digital keyrings, ensuring high security for online services and digital identities
    • Sencore MRD 7000, a professional multi-channel receiver and decoder supporting UHD and HD stream decoding
    "},{"location":"home/design_goals/","title":"Design goals","text":"

    There are myriads of JSON libraries out there, and each may even have its reason to exist. Our class had these design goals:

    • Intuitive syntax. In languages such as Python, JSON feels like a first-class data type. We used all the operator magic of modern C++ to achieve the same feeling in your code.

    • Trivial integration. Our whole code consists of a single header file json.hpp. That's it. No library, no subproject, no dependencies, no complex build system. The class is written in vanilla C++11. All in all, everything should require no adjustment of your compiler flags or project settings.

    • Serious testing. Our class is heavily unit-tested and covers 100% of the code, including all exceptional behavior. Furthermore, we checked with Valgrind and the Clang Sanitizers that there are no memory leaks. Google OSS-Fuzz additionally runs fuzz tests against all parsers 24/7, effectively executing billions of tests so far. To maintain high quality, the project is following the Core Infrastructure Initiative (CII) best practices.

    Other aspects were not so important to us:

    • Memory efficiency. Each JSON object has an overhead of one pointer (the maximal size of a union) and one enumeration element (1 byte). The default generalization uses the following C++ data types: std::string for strings, int64_t, uint64_t or double for numbers, std::map for objects, std::vector for arrays, and bool for Booleans. However, you can template the generalized class basic_json to your needs.

    • Speed. There are certainly faster JSON libraries out there. However, if your goal is to speed up your development by adding JSON support with a single header, then this library is the way to go. If you know how to use a std::vector or std::map, you are already set.

    See the contribution guidelines for more information.

    "},{"location":"home/exceptions/","title":"Exceptions","text":""},{"location":"home/exceptions/#overview","title":"Overview","text":""},{"location":"home/exceptions/#base-type","title":"Base type","text":"

    All exceptions inherit from class json::exception (which in turn inherits from std::exception). It is used as the base class for all exceptions thrown by the basic_json class. This class can hence be used as \"wildcard\" to catch exceptions.

    classDiagram\n  direction LR\n    class `std::exception` {\n        <<interface>>\n    }\n\n    class `json::exception` {\n        +const int id\n        +const char* what() const\n    }\n\n    class `json::parse_error` {\n        +const std::size_t byte\n    }\n\n    class `json::invalid_iterator`\n    class `json::type_error`\n    class `json::out_of_range`\n    class `json::other_error`\n\n    `std::exception` <|-- `json::exception`\n    `json::exception` <|-- `json::parse_error`\n    `json::exception` <|-- `json::invalid_iterator`\n    `json::exception` <|-- `json::type_error`\n    `json::exception` <|-- `json::out_of_range`\n    `json::exception` <|-- `json::other_error`
    "},{"location":"home/exceptions/#switch-off-exceptions","title":"Switch off exceptions","text":"

    Exceptions are used widely within the library. They can, however, be switched off with either using the compiler flag -fno-exceptions or by defining the symbol JSON_NOEXCEPTION. In this case, exceptions are replaced by abort() calls. You can further control this behavior by defining JSON_THROW_USER (overriding throw), JSON_TRY_USER (overriding try), and JSON_CATCH_USER (overriding catch).

    Note that JSON_THROW_USER should leave the current scope (e.g., by throwing or aborting), as continuing after it may yield undefined behavior.

    Example

    The code below switches off exceptions and creates a log entry with a detailed error message in case of errors.

    #include <iostream>\n\n#define JSON_TRY_USER if(true)\n#define JSON_CATCH_USER(exception) if(false)\n#define JSON_THROW_USER(exception)                           \\\n    {std::clog << \"Error in \" << __FILE__ << \":\" << __LINE__ \\\n               << \" (function \" << __FUNCTION__ << \") - \"    \\\n               << (exception).what() << std::endl;           \\\n     std::abort();}\n\n#include <nlohmann/json.hpp>\n

    Note the explanatory what() string of exceptions is not available for MSVC if exceptions are disabled, see #2824.

    See documentation of JSON_TRY_USER, JSON_CATCH_USER and JSON_THROW_USER for more information.

    "},{"location":"home/exceptions/#extended-diagnostic-messages","title":"Extended diagnostic messages","text":"

    Exceptions in the library are thrown in the local context of the JSON value they are detected. This makes detailed diagnostics messages, and hence debugging, difficult.

    Example 
    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    json j;\n    j[\"address\"][\"street\"] = \"Fake Street\";\n    j[\"address\"][\"housenumber\"] = \"12\";\n\n    try\n    {\n        int housenumber = j[\"address\"][\"housenumber\"];\n    }\n    catch (const json::exception& e)\n    {\n        std::cout << e.what() << '\\n';\n    }\n}\n

    Output:

    [json.exception.type_error.302] type must be number, but is string\n

    This exception can be hard to debug if storing the value \"12\" and accessing it is further apart.

    To create better diagnostics messages, each JSON value needs a pointer to its parent value such that a global context (i.e., a path from the root value to the value that led to the exception) can be created. That global context is provided as JSON Pointer.

    As this global context comes at the price of storing one additional pointer per JSON value and runtime overhead to maintain the parent relation, extended diagnostics are disabled by default. They can, however, be enabled by defining the preprocessor symbol JSON_DIAGNOSTICS to 1 before including json.hpp.

    Example 
    #include <iostream>\n\n# define JSON_DIAGNOSTICS 1\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    json j;\n    j[\"address\"][\"street\"] = \"Fake Street\";\n    j[\"address\"][\"housenumber\"] = \"12\";\n\n    try\n    {\n        int housenumber = j[\"address\"][\"housenumber\"];\n    }\n    catch (const json::exception& e)\n    {\n        std::cout << e.what() << '\\n';\n    }\n}\n

    Output:

    [json.exception.type_error.302] (/address/housenumber) type must be number, but is string\n

    Now the exception message contains a JSON Pointer /address/housenumber that indicates which value has the wrong type.

    See documentation of JSON_DIAGNOSTICS for more information.

    "},{"location":"home/exceptions/#parse-errors","title":"Parse errors","text":"

    The library throws this exception when a parse error occurs. Parse errors can occur during the deserialization of JSON text, CBOR, MessagePack, as well as when using JSON Patch.

    Exceptions have ids 1xx.

    Byte index

    Member byte holds the byte index of the last read character in the input file.

    For an input with n bytes, 1 is the index of the first character and n+1 is the index of the terminating null byte or the end of file. This also holds true when reading a byte vector (CBOR or MessagePack).

    Example

    The following code shows how a parse_error exception can be caught.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    try\n    {\n        // parsing input with a syntax error\n        json::parse(\"[1,2,3,]\");\n    }\n    catch (const json::parse_error& e)\n    {\n        // output exception information\n        std::cout << \"message: \" << e.what() << '\\n'\n                  << \"exception id: \" << e.id << '\\n'\n                  << \"byte position of error: \" << e.byte << std::endl;\n    }\n}\n

    Output:

    message: [json.exception.parse_error.101] parse error at line 1, column 8: syntax error while parsing value - unexpected ']'; expected '[', '{', or a literal\nexception id: 101\nbyte position of error: 8\n
    "},{"location":"home/exceptions/#jsonexceptionparse_error101","title":"json.exception.parse_error.101","text":"

    This error indicates a syntax error while deserializing a JSON text. The error message describes that an unexpected token (character) was encountered, and the member byte indicates the error position.

    Example message

    Input ended prematurely:

    [json.exception.parse_error.101] parse error at 2: unexpected end of input; expected string literal\n

    No input:

    [json.exception.parse_error.101] parse error at line 1, column 1: attempting to parse an empty input; check that your input string or stream contains the expected JSON\n

    Control character was not escaped:

    [json.exception.parse_error.101] parse error at line 1, column 2: syntax error while parsing value - invalid string: control character U+0009 (HT) must be escaped to \\u0009 or \\\\; last read: '\"<U+0009>'\"\n

    String was not closed:

    [json.exception.parse_error.101] parse error at line 1, column 2: syntax error while parsing value - invalid string: missing closing quote; last read: '\"'\n

    Invalid number format:

    [json.exception.parse_error.101] parse error at line 1, column 3: syntax error while parsing value - invalid number; expected '+', '-', or digit after exponent; last read: '1E'\n

    \\u was not be followed by four hex digits:

    [json.exception.parse_error.101] parse error at line 1, column 6: syntax error while parsing value - invalid string: '\\u' must be followed by 4 hex digits; last read: '\"\\u01\"'\n

    Invalid UTF-8 surrogate pair:

    [json.exception.parse_error.101] parse error at line 1, column 13: syntax error while parsing value - invalid string: surrogate U+DC00..U+DFFF must follow U+D800..U+DBFF; last read: '\"\\uD7FF\\uDC00'\"\n

    Invalid UTF-8 byte:

    [json.exception.parse_error.101] parse error at line 3, column 24: syntax error while parsing value - invalid string: ill-formed UTF-8 byte; last read: '\"vous \\352t'\n

    Tip

    • Make sure the input is correctly read. Try to write the input to standard output to check if, for instance, the input file was successfully opened.
    • Paste the input to a JSON validator like http://jsonlint.com or a tool like jq.
    "},{"location":"home/exceptions/#jsonexceptionparse_error102","title":"json.exception.parse_error.102","text":"

    JSON uses the \\uxxxx format to describe Unicode characters. Code points above 0xFFFF are split into two \\uxxxx entries (\"surrogate pairs\"). This error indicates that the surrogate pair is incomplete or contains an invalid code point.

    Example message

    parse error at 14: missing or wrong low surrogate\n

    Note

    This exception is not used any more. Instead json.exception.parse_error.101 with a more detailed description is used.

    "},{"location":"home/exceptions/#jsonexceptionparse_error103","title":"json.exception.parse_error.103","text":"

    Unicode supports code points up to 0x10FFFF. Code points above 0x10FFFF are invalid.

    Example message

    parse error: code points above 0x10FFFF are invalid\n

    Note

    This exception is not used any more. Instead json.exception.parse_error.101 with a more detailed description is used.

    "},{"location":"home/exceptions/#jsonexceptionparse_error104","title":"json.exception.parse_error.104","text":"

    RFC 6902 requires a JSON Patch document to be a JSON document that represents an array of objects.

    Example message

    [json.exception.parse_error.104] parse error: JSON patch must be an array of objects\n
    "},{"location":"home/exceptions/#jsonexceptionparse_error105","title":"json.exception.parse_error.105","text":"

    An operation of a JSON Patch document must contain exactly one \"op\" member, whose value indicates the operation to perform. Its value must be one of \"add\", \"remove\", \"replace\", \"move\", \"copy\", or \"test\"; other values are errors.

    Example message

    [json.exception.parse_error.105] parse error: operation 'add' must have member 'value'\n
    [json.exception.parse_error.105] parse error: operation 'copy' must have string member 'from'\n
    [json.exception.parse_error.105] parse error: operation value 'foo' is invalid\n

    "},{"location":"home/exceptions/#jsonexceptionparse_error106","title":"json.exception.parse_error.106","text":"

    An array index in a JSON Pointer (RFC 6901) may be 0 or any number without a leading 0.

    Example message

    [json.exception.parse_error.106] parse error: array index '01' must not begin with '0'\n
    "},{"location":"home/exceptions/#jsonexceptionparse_error107","title":"json.exception.parse_error.107","text":"

    A JSON Pointer must be a Unicode string containing a sequence of zero or more reference tokens, each prefixed by a / character.

    Example message

    [json.exception.parse_error.107] parse error at byte 1: JSON pointer must be empty or begin with '/' - was: 'foo'\n
    "},{"location":"home/exceptions/#jsonexceptionparse_error108","title":"json.exception.parse_error.108","text":"

    In a JSON Pointer, only ~0 and ~1 are valid escape sequences.

    Example message

    [json.exception.parse_error.108] parse error: escape character '~' must be followed with '0' or '1'\n
    "},{"location":"home/exceptions/#jsonexceptionparse_error109","title":"json.exception.parse_error.109","text":"

    A JSON Pointer array index must be a number.

    Example messages

    [json.exception.parse_error.109] parse error: array index 'one' is not a number\n
    [json.exception.parse_error.109] parse error: array index '+1' is not a number\n

    "},{"location":"home/exceptions/#jsonexceptionparse_error110","title":"json.exception.parse_error.110","text":"

    When parsing CBOR or MessagePack, the byte vector ends before the complete value has been read.

    Example message

    [json.exception.parse_error.110] parse error at byte 5: syntax error while parsing CBOR string: unexpected end of input\n
    [json.exception.parse_error.110] parse error at byte 2: syntax error while parsing UBJSON value: expected end of input; last byte: 0x5A\n

    "},{"location":"home/exceptions/#jsonexceptionparse_error112","title":"json.exception.parse_error.112","text":"

    An unexpected byte was read in a binary format or length information is invalid (BSON).

    Example messages

    [json.exception.parse_error.112] parse error at byte 1: syntax error while parsing CBOR value: invalid byte: 0x1C\n
    [json.exception.parse_error.112] parse error at byte 1: syntax error while parsing MessagePack value: invalid byte: 0xC1\n
    [json.exception.parse_error.112] parse error at byte 4: syntax error while parsing BJData size: expected '#' after type information; last byte: 0x02\n
    [json.exception.parse_error.112] parse error at byte 4: syntax error while parsing UBJSON size: expected '#' after type information; last byte: 0x02\n
    [json.exception.parse_error.112] parse error at byte 10: syntax error while parsing BSON string: string length must be at least 1, is -2147483648\n
    [json.exception.parse_error.112] parse error at byte 15: syntax error while parsing BSON binary: byte array length cannot be negative, is -1\n

    "},{"location":"home/exceptions/#jsonexceptionparse_error113","title":"json.exception.parse_error.113","text":"

    While parsing a map key, a value that is not a string has been read.

    Example messages

    [json.exception.parse_error.113] parse error at byte 2: syntax error while parsing CBOR string: expected length specification (0x60-0x7B) or indefinite string type (0x7F); last byte: 0xFF\n
    [json.exception.parse_error.113] parse error at byte 2: syntax error while parsing MessagePack string: expected length specification (0xA0-0xBF, 0xD9-0xDB); last byte: 0xFF\n
    [json.exception.parse_error.113] parse error at byte 2: syntax error while parsing UBJSON char: byte after 'C' must be in range 0x00..0x7F; last byte: 0x82\n

    "},{"location":"home/exceptions/#jsonexceptionparse_error114","title":"json.exception.parse_error.114","text":"

    The parsing of the corresponding BSON record type is not implemented (yet).

    Example message

    [json.exception.parse_error.114] parse error at byte 5: Unsupported BSON record type 0xFF\n
    "},{"location":"home/exceptions/#jsonexceptionparse_error115","title":"json.exception.parse_error.115","text":"

    A UBJSON high-precision number could not be parsed.

    Example message

    [json.exception.parse_error.115] parse error at byte 5: syntax error while parsing UBJSON high-precision number: invalid number text: 1A\n
    "},{"location":"home/exceptions/#iterator-errors","title":"Iterator errors","text":"

    This exception is thrown if iterators passed to a library function do not match the expected semantics.

    Exceptions have ids 2xx.

    Example

    The following code shows how an invalid_iterator exception can be caught.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    try\n    {\n        // calling iterator::key() on non-object iterator\n        json j = \"string\";\n        json::iterator it = j.begin();\n        auto k = it.key();\n    }\n    catch (const json::invalid_iterator& e)\n    {\n        // output exception information\n        std::cout << \"message: \" << e.what() << '\\n'\n                  << \"exception id: \" << e.id << std::endl;\n    }\n}\n

    Output:

    message: [json.exception.invalid_iterator.207] cannot use key() for non-object iterators\nexception id: 207\n
    "},{"location":"home/exceptions/#jsonexceptioninvalid_iterator201","title":"json.exception.invalid_iterator.201","text":"

    The iterators passed to constructor basic_json(InputIT first, InputIT last) are not compatible, meaning they do not belong to the same container. Therefore, the range (first, last) is invalid.

    Example message

    [json.exception.invalid_iterator.201] iterators are not compatible\n
    "},{"location":"home/exceptions/#jsonexceptioninvalid_iterator202","title":"json.exception.invalid_iterator.202","text":"

    In the erase or insert function, the passed iterator pos does not belong to the JSON value for which the function was called. It hence does not define a valid position for the deletion/insertion.

    Example messages

    [json.exception.invalid_iterator.202] iterator does not fit current value\n
    [json.exception.invalid_iterator.202] iterators first and last must point to objects\n

    "},{"location":"home/exceptions/#jsonexceptioninvalid_iterator203","title":"json.exception.invalid_iterator.203","text":"

    Either iterator passed to function erase(IteratorType first, IteratorType last) does not belong to the JSON value from which values shall be erased. It hence does not define a valid range to delete values from.

    Example message

    [json.exception.invalid_iterator.203] iterators do not fit current value\n
    "},{"location":"home/exceptions/#jsonexceptioninvalid_iterator204","title":"json.exception.invalid_iterator.204","text":"

    When an iterator range for a primitive type (number, boolean, or string) is passed to a constructor or an erase function, this range has to be exactly (begin(), end()), because this is the only way the single stored value is expressed. All other ranges are invalid.

    Example message

    [json.exception.invalid_iterator.204] iterators out of range\n
    "},{"location":"home/exceptions/#jsonexceptioninvalid_iterator205","title":"json.exception.invalid_iterator.205","text":"

    When an iterator for a primitive type (number, boolean, or string) is passed to an erase function, the iterator has to be the begin() iterator, because it is the only way to address the stored value. All other iterators are invalid.

    Example message

    [json.exception.invalid_iterator.205] iterator out of range\n
    "},{"location":"home/exceptions/#jsonexceptioninvalid_iterator206","title":"json.exception.invalid_iterator.206","text":"

    The iterators passed to constructor basic_json(InputIT first, InputIT last) belong to a JSON null value and hence to not define a valid range.

    Example message

    [json.exception.invalid_iterator.206] cannot construct with iterators from null\n
    "},{"location":"home/exceptions/#jsonexceptioninvalid_iterator207","title":"json.exception.invalid_iterator.207","text":"

    The key() member function can only be used on iterators belonging to a JSON object, because other types do not have a concept of a key.

    Example message

    [json.exception.invalid_iterator.207] cannot use key() for non-object iterators\n
    "},{"location":"home/exceptions/#jsonexceptioninvalid_iterator208","title":"json.exception.invalid_iterator.208","text":"

    The operator[] to specify a concrete offset cannot be used on iterators belonging to a JSON object, because JSON objects are unordered.

    Example message

    [json.exception.invalid_iterator.208] cannot use operator[] for object iterators\n
    "},{"location":"home/exceptions/#jsonexceptioninvalid_iterator209","title":"json.exception.invalid_iterator.209","text":"

    The offset operators (+, -, +=, -=) cannot be used on iterators belonging to a JSON object, because JSON objects are unordered.

    Example message

    [json.exception.invalid_iterator.209] cannot use offsets with object iterators\n
    "},{"location":"home/exceptions/#jsonexceptioninvalid_iterator210","title":"json.exception.invalid_iterator.210","text":"

    The iterator range passed to the insert function is not compatible, meaning they do not belong to the same container. Therefore, the range (first, last) is invalid.

    Example message

    [json.exception.invalid_iterator.210] iterators do not fit\n
    "},{"location":"home/exceptions/#jsonexceptioninvalid_iterator211","title":"json.exception.invalid_iterator.211","text":"

    The iterator range passed to the insert function must not be a subrange of the container to insert to.

    Example message

    [json.exception.invalid_iterator.211] passed iterators may not belong to container\n
    "},{"location":"home/exceptions/#jsonexceptioninvalid_iterator212","title":"json.exception.invalid_iterator.212","text":"

    When two iterators are compared, they must belong to the same container.

    Example message

    [json.exception.invalid_iterator.212] cannot compare iterators of different containers\n
    "},{"location":"home/exceptions/#jsonexceptioninvalid_iterator213","title":"json.exception.invalid_iterator.213","text":"

    The order of object iterators cannot be compared, because JSON objects are unordered.

    Example message

    [json.exception.invalid_iterator.213] cannot compare order of object iterators\n
    "},{"location":"home/exceptions/#jsonexceptioninvalid_iterator214","title":"json.exception.invalid_iterator.214","text":"

    Cannot retrieve value from iterator: The iterator either refers to a null value, or it refers to a primitive type (number, boolean, or string), but does not match the iterator returned by begin().

    Example message

    [json.exception.invalid_iterator.214] cannot get value\n
    "},{"location":"home/exceptions/#type-errors","title":"Type errors","text":"

    This exception is thrown in case of a type error; that is, a library function is executed on a JSON value whose type does not match the expected semantics.

    Exceptions have ids 3xx.

    Example

    The following code shows how a type_error exception can be caught.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    try\n    {\n        // calling push_back() on a string value\n        json j = \"string\";\n        j.push_back(\"another string\");\n    }\n    catch (const json::type_error& e)\n    {\n        // output exception information\n        std::cout << \"message: \" << e.what() << '\\n'\n                  << \"exception id: \" << e.id << std::endl;\n    }\n}\n

    Output:

    message: [json.exception.type_error.308] cannot use push_back() with string\nexception id: 308\n
    "},{"location":"home/exceptions/#jsonexceptiontype_error301","title":"json.exception.type_error.301","text":"

    To create an object from an initializer list, the initializer list must consist only of a list of pairs whose first element is a string. When this constraint is violated, an array is created instead.

    Example message

    [json.exception.type_error.301] cannot create object from initializer list\n
    "},{"location":"home/exceptions/#jsonexceptiontype_error302","title":"json.exception.type_error.302","text":"

    During implicit or explicit value conversion, the JSON type must be compatible with the target type. For instance, a JSON string can only be converted into string types, but not into numbers or boolean types.

    Example messages

    [json.exception.type_error.302] type must be object, but is null\n
    [json.exception.type_error.302] type must be string, but is object\n

    "},{"location":"home/exceptions/#jsonexceptiontype_error303","title":"json.exception.type_error.303","text":"

    To retrieve a reference to a value stored in a basic_json object with get_ref, the type of the reference must match the value type. For instance, for a JSON array, the ReferenceType must be array_t &.

    Example messages

    [json.exception.type_error.303] incompatible ReferenceType for get_ref, actual type is object\n
    [json.exception.type_error.303] incompatible ReferenceType for get_ref, actual type is number\"\n

    "},{"location":"home/exceptions/#jsonexceptiontype_error304","title":"json.exception.type_error.304","text":"

    The at() member functions can only be executed for certain JSON types.

    Example messages

    [json.exception.type_error.304] cannot use at() with string\n
    [json.exception.type_error.304] cannot use at() with number\n

    "},{"location":"home/exceptions/#jsonexceptiontype_error305","title":"json.exception.type_error.305","text":"

    The operator[] member functions can only be executed for certain JSON types.

    Example messages

    [json.exception.type_error.305] cannot use operator[] with a string argument with array\n
    [json.exception.type_error.305] cannot use operator[] with a numeric argument with object\n

    "},{"location":"home/exceptions/#jsonexceptiontype_error306","title":"json.exception.type_error.306","text":"

    The value() member functions can only be executed for certain JSON types.

    Example message

    [json.exception.type_error.306] cannot use value() with number\n
    "},{"location":"home/exceptions/#jsonexceptiontype_error307","title":"json.exception.type_error.307","text":"

    The erase() member functions can only be executed for certain JSON types.

    Example message

    [json.exception.type_error.307] cannot use erase() with string\n
    "},{"location":"home/exceptions/#jsonexceptiontype_error308","title":"json.exception.type_error.308","text":"

    The push_back() and operator+= member functions can only be executed for certain JSON types.

    Example message

    [json.exception.type_error.308] cannot use push_back() with string\n
    "},{"location":"home/exceptions/#jsonexceptiontype_error309","title":"json.exception.type_error.309","text":"

    The insert() member functions can only be executed for certain JSON types.

    Example messages

    [json.exception.type_error.309] cannot use insert() with array\n
    [json.exception.type_error.309] cannot use insert() with number\n

    "},{"location":"home/exceptions/#jsonexceptiontype_error310","title":"json.exception.type_error.310","text":"

    The swap() member functions can only be executed for certain JSON types.

    Example message

    [json.exception.type_error.310] cannot use swap() with number\n
    "},{"location":"home/exceptions/#jsonexceptiontype_error311","title":"json.exception.type_error.311","text":"

    The emplace() and emplace_back() member functions can only be executed for certain JSON types.

    Example messages

    [json.exception.type_error.311] cannot use emplace() with number\n
    [json.exception.type_error.311] cannot use emplace_back() with number\n

    "},{"location":"home/exceptions/#jsonexceptiontype_error312","title":"json.exception.type_error.312","text":"

    The update() member functions can only be executed for certain JSON types.

    Example message

    [json.exception.type_error.312] cannot use update() with array\n
    "},{"location":"home/exceptions/#jsonexceptiontype_error313","title":"json.exception.type_error.313","text":"

    The unflatten function converts an object whose keys are JSON Pointers back into an arbitrary nested JSON value. The JSON Pointers must not overlap, because then the resulting value would not be well-defined.

    Example message

    [json.exception.type_error.313] invalid value to unflatten\n
    "},{"location":"home/exceptions/#jsonexceptiontype_error314","title":"json.exception.type_error.314","text":"

    The unflatten function only works for an object whose keys are JSON Pointers.

    Example message

    Calling unflatten() on an array [1,2,3]:

    [json.exception.type_error.314] only objects can be unflattened\n
    "},{"location":"home/exceptions/#jsonexceptiontype_error315","title":"json.exception.type_error.315","text":"

    The unflatten() function only works for an object whose keys are JSON Pointers and whose values are primitive.

    Example message

    Calling unflatten() on an object {\"/1\", [1,2,3]}:

    [json.exception.type_error.315] values in object must be primitive\n
    "},{"location":"home/exceptions/#jsonexceptiontype_error316","title":"json.exception.type_error.316","text":"

    The dump() function only works with UTF-8 encoded strings; that is, if you assign a std::string to a JSON value, make sure it is UTF-8 encoded.

    Example message

    Calling dump() on a JSON value containing an ISO 8859-1 encoded string: 

    [json.exception.type_error.316] invalid UTF-8 byte at index 15: 0x6F\n

    Tip

    • Store the source file with UTF-8 encoding.
    • Pass an error handler as last parameter to the dump() function to avoid this exception:
      • json::error_handler_t::replace will replace invalid bytes sequences with U+FFFD
      • json::error_handler_t::ignore will silently ignore invalid byte sequences
    "},{"location":"home/exceptions/#jsonexceptiontype_error317","title":"json.exception.type_error.317","text":"

    The dynamic type of the object cannot be represented in the requested serialization format (e.g., a raw true or null JSON object cannot be serialized to BSON)

    Example messages

    Serializing null to BSON: 

    [json.exception.type_error.317] to serialize to BSON, top-level type must be object, but is null\n
    Serializing [1,2,3] to BSON: 
    [json.exception.type_error.317] to serialize to BSON, top-level type must be object, but is array\n

    Tip

    Encapsulate the JSON value in an object. That is, instead of serializing true, serialize {\"value\": true}

    "},{"location":"home/exceptions/#out-of-range","title":"Out of range","text":"

    This exception is thrown in case a library function is called on an input parameter that exceeds the expected range, for instance, in the case of array indices or nonexisting object keys.

    Exceptions have ids 4xx.

    Example

    The following code shows how an out_of_range exception can be caught.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    try\n    {\n        // calling at() for an invalid index\n        json j = {1, 2, 3, 4};\n        j.at(4) = 10;\n    }\n    catch (const json::out_of_range& e)\n    {\n        // output exception information\n        std::cout << \"message: \" << e.what() << '\\n'\n                  << \"exception id: \" << e.id << std::endl;\n    }\n}\n

    Output:

    message: [json.exception.out_of_range.401] array index 4 is out of range\nexception id: 401\n
    "},{"location":"home/exceptions/#jsonexceptionout_of_range401","title":"json.exception.out_of_range.401","text":"

    The provided array index i is larger than size-1.

    Example message

    array index 3 is out of range\n
    "},{"location":"home/exceptions/#jsonexceptionout_of_range402","title":"json.exception.out_of_range.402","text":"

    The special array index - in a JSON Pointer never describes a valid element of the array, but the index past the end. That is, it can only be used to add elements at this position, but not to read it.

    Example message

    array index '-' (3) is out of range\n
    "},{"location":"home/exceptions/#jsonexceptionout_of_range403","title":"json.exception.out_of_range.403","text":"

    The provided key was not found in the JSON object.

    Example message

    key 'foo' not found\n
    "},{"location":"home/exceptions/#jsonexceptionout_of_range404","title":"json.exception.out_of_range.404","text":"

    A reference token in a JSON Pointer could not be resolved.

    Example message

    unresolved reference token 'foo'\n
    "},{"location":"home/exceptions/#jsonexceptionout_of_range405","title":"json.exception.out_of_range.405","text":"

    The JSON Patch operations 'remove' and 'add' cannot be applied to the root element of the JSON value.

    Example message

    JSON pointer has no parent\n
    "},{"location":"home/exceptions/#jsonexceptionout_of_range406","title":"json.exception.out_of_range.406","text":"

    A parsed number could not be stored as without changing it to NaN or INF.

    Example message

    number overflow parsing '10E1000'\n
    "},{"location":"home/exceptions/#jsonexceptionout_of_range407","title":"json.exception.out_of_range.407","text":"

    This exception previously indicated that the UBJSON and BSON binary formats did not support integer numbers greater than 9223372036854775807 due to limitations in the implemented mapping. However, these limitations have since been resolved, and this exception no longer occurs.

    Exception cannot occur any more

    • Since version 3.9.0, integer numbers beyond int64 are serialized as high-precision UBJSON numbers.
    • Since version 3.12.0, integer numbers beyond int64 are serialized as uint64 BSON numbers.
    "},{"location":"home/exceptions/#jsonexceptionout_of_range408","title":"json.exception.out_of_range.408","text":"

    The size (following #) of an UBJSON array or object exceeds the maximal capacity.

    Example message

    excessive array size: 8658170730974374167\n
    "},{"location":"home/exceptions/#jsonexceptionout_of_range409","title":"json.exception.out_of_range.409","text":"

    Key identifiers to be serialized to BSON cannot contain code point U+0000, since the key is stored as zero-terminated c-string.

    Example message

    BSON key cannot contain code point U+0000 (at byte 2)\n
    "},{"location":"home/exceptions/#further-exceptions","title":"Further exceptions","text":"

    This exception is thrown in case of errors that cannot be classified with the other exception types.

    Exceptions have ids 5xx.

    Example

    The following code shows how an other_error exception can be caught.

    #include <iostream>\n#include <nlohmann/json.hpp>\n\nusing json = nlohmann::json;\nusing namespace nlohmann::literals;\n\nint main()\n{\n    try\n    {\n        // executing a failing JSON Patch operation\n        json value = R\"({\n            \"best_biscuit\": {\n                \"name\": \"Oreo\"\n            }\n        })\"_json;\n        json patch = R\"([{\n            \"op\": \"test\",\n            \"path\": \"/best_biscuit/name\",\n            \"value\": \"Choco Leibniz\"\n        }])\"_json;\n        value.patch(patch);\n    }\n    catch (const json::other_error& e)\n    {\n        // output exception information\n        std::cout << \"message: \" << e.what() << '\\n'\n                  << \"exception id: \" << e.id << std::endl;\n    }\n}\n

    Output:

    message: [json.exception.other_error.501] unsuccessful: {\"op\":\"test\",\"path\":\"/best_biscuit/name\",\"value\":\"Choco Leibniz\"}\nexception id: 501\n
    "},{"location":"home/exceptions/#jsonexceptionother_error501","title":"json.exception.other_error.501","text":"

    A JSON Patch operation 'test' failed. The unsuccessful operation is also printed.

    Example message

    Executing {\"op\":\"test\", \"path\":\"/baz\", \"value\":\"bar\"} on {\"baz\": \"qux\"}:

    [json.exception.other_error.501] unsuccessful: {\"op\":\"test\",\"path\":\"/baz\",\"value\":\"bar\"}\n
    "},{"location":"home/faq/","title":"Frequently Asked Questions (FAQ)","text":""},{"location":"home/faq/#known-bugs","title":"Known bugs","text":""},{"location":"home/faq/#brace-initialization-yields-arrays","title":"Brace initialization yields arrays","text":"

    Question

    Why does

    json j{true};\n

    and

    json j(true);\n

    yield different results ([true] vs. true)?

    This is a known issue, and -- even worse -- the behavior differs between GCC and Clang. The \"culprit\" for this is the library's constructor overloads for initializer lists to allow syntax like

    json array = {1, 2, 3, 4};\n

    for arrays and

    json object = {{\"one\", 1}, {\"two\", 2}}; \n

    for objects.

    Tip

    To avoid any confusion and ensure portable code, do not use brace initialization with the types basic_json, json, or ordered_json unless you want to create an object or array as shown in the examples above.

    "},{"location":"home/faq/#limitations","title":"Limitations","text":""},{"location":"home/faq/#relaxed-parsing","title":"Relaxed parsing","text":"

    Question

    Can you add an option to ignore trailing commas?

    This library does not support any feature that would jeopardize interoperability.

    "},{"location":"home/faq/#parse-errors-reading-non-ascii-characters","title":"Parse errors reading non-ASCII characters","text":"

    Questions

    • Why is the parser complaining about a Chinese character?
    • Does the library support Unicode?
    • I get an exception [json.exception.parse_error.101] parse error at line 1, column 53: syntax error while parsing value - invalid string: ill-formed UTF-8 byte; last read: '\"Test\u00e9$')\"

    The library supports Unicode input as follows:

    • Only UTF-8 encoded input is supported, which is the default encoding for JSON, according to RFC 8259.
    • std::u16string and std::u32string can be parsed, assuming UTF-16 and UTF-32 encoding, respectively. These encodings are not supported when reading from files or other input containers.
    • Other encodings such as Latin-1 or ISO 8859-1 are not supported and will yield parse or serialization errors.
    • The library will not replace Unicode noncharacters.
    • Invalid surrogates (e.g., incomplete pairs such as \\uDEAD) will yield parse errors.
    • The strings stored in the library are UTF-8 encoded. When using the default string type (std::string), note that its length/size functions return the number of stored bytes rather than the number of characters or glyphs.
    • When you store strings with different encodings in the library, calling dump() may throw an exception unless json::error_handler_t::replace or json::error_handler_t::ignore are used as error handlers.

    In most cases, the parser is right to complain, because the input is not UTF-8 encoded. This is especially true for Microsoft Windows, where Latin-1 or ISO 8859-1 is often the standard encoding.

    "},{"location":"home/faq/#wide-string-handling","title":"Wide string handling","text":"

    Question

    Why are wide strings (e.g., std::wstring) dumped as arrays of numbers?

    As described above, the library assumes UTF-8 as encoding. To store a wide string, you need to change the encoding.

    Example

    #include <codecvt> // codecvt_utf8\n#include <locale>  // wstring_convert\n\n// encoding function\nstd::string to_utf8(std::wstring& wide_string)\n{\n    static std::wstring_convert<std::codecvt_utf8<wchar_t>> utf8_conv;\n    return utf8_conv.to_bytes(wide_string);\n}\n\njson j;\nstd::wstring ws = L\"\u8ecaB1234 \u3053\u3093\u306b\u3061\u306f\";\n\nj[\"original\"] = ws;\nj[\"encoded\"] = to_utf8(ws);\n\nstd::cout << j << std::endl;\n

    The result is:

    {\n  \"encoded\": \"\u8ecaB1234 \u3053\u3093\u306b\u3061\u306f\",\n  \"original\": [36554, 66, 49, 50, 51, 52, 32, 12371, 12435, 12395, 12385, 12399]\n}\n
    "},{"location":"home/faq/#exceptions","title":"Exceptions","text":""},{"location":"home/faq/#parsing-without-exceptions","title":"Parsing without exceptions","text":"

    Question

    Is it possible to indicate a parse error without throwing an exception?

    Yes, see Parsing and exceptions.

    "},{"location":"home/faq/#key-name-in-exceptions","title":"Key name in exceptions","text":"

    Question

    Can I get the key of the object item that caused an exception?

    Yes, you can. Please define the symbol JSON_DIAGNOSTICS to get extended diagnostics messages.

    "},{"location":"home/faq/#serialization-issues","title":"Serialization issues","text":""},{"location":"home/faq/#number-precision","title":"Number precision","text":"

    Question

    • It seems that precision is lost when serializing a double.
    • Can I change the precision for floating-point serialization?

    The library uses std::numeric_limits<number_float_t>::digits10 (15 for IEEE doubles) digits for serialization. This value is sufficient to guarantee roundtripping. If one uses more than this number of digits of precision, then string -> value -> string is not guaranteed to round-trip.

    cppreference.com

    The value of std::numeric_limits<T>::digits10 is the number of base-10 digits that can be represented by the type T without change, that is, any number with this many significant decimal digits can be converted to a value of type T and back to decimal form, without change due to rounding or overflow.

    Tip

    The website https://float.exposed gives a good insight into the internal storage of floating-point numbers.

    See this section on the library's number handling for more information.

    "},{"location":"home/faq/#compilation-issues","title":"Compilation issues","text":""},{"location":"home/faq/#android-sdk","title":"Android SDK","text":"

    Question

    Why does the code not compile with Android SDK?

    Android defaults to using very old compilers and C++ libraries. To fix this, add the following to your Application.mk. This will switch to the LLVM C++ library, the Clang compiler, and enable C++11 and other features disabled by default.

    APP_STL := c++_shared\nNDK_TOOLCHAIN_VERSION := clang3.6\nAPP_CPPFLAGS += -frtti -fexceptions\n

    The code compiles successfully with Android NDK, Revision 9 - 11 (and possibly later) and CrystaX's Android NDK version 10.

    "},{"location":"home/faq/#missing-stl-function","title":"Missing STL function","text":"

    Questions

    • Why do I get a compilation error 'to_string' is not a member of 'std' (or similarly, for strtod or strtof)?
    • Why does the code not compile with MinGW or Android SDK?

    This is not an issue with the code, but rather with the compiler itself. On Android, see above to build with a newer environment. For MinGW, please refer to this site and this discussion for information on how to fix this bug. For Android NDK using APP_STL := gnustl_static, please refer to this discussion.

    "},{"location":"home/license/","title":"License","text":"

    The class is licensed under the MIT License:

    Copyright \u00a9 2013-2025 Niels Lohmann

    Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the \u201cSoftware\u201d), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

    The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

    THE SOFTWARE IS PROVIDED \u201cAS IS\u201d, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

    The class contains the UTF-8 Decoder from Bjoern Hoehrmann which is licensed under the MIT License (see above). Copyright \u00a9 2008-2009 Bj\u00f6rn Hoehrmann bjoern@hoehrmann.de

    The class contains a slightly modified version of the Grisu2 algorithm from Florian Loitsch which is licensed under the MIT License (see above). Copyright \u00a9 2009 Florian Loitsch

    The class contains a copy of Hedley from Evan Nemerson which is licensed as CC0-1.0.

    "},{"location":"home/releases/","title":"Releases","text":""},{"location":"home/releases/#v373","title":"v3.7.3","text":"

    Files

    • include.zip (274 KB)
    • include.zip.asc (1 KB)
    • json.hpp (791 KB)
    • json.hpp.asc (1 KB)

    Release date: 2019-11-17 SHA-256: 3b5d2b8f8282b80557091514d8ab97e27f9574336c804ee666fda673a9b59926 (json.hpp), 87b5884741427220d3a33df1363ae0e8b898099fbc59f1c451113f6732891014 (include.zip)

    "},{"location":"home/releases/#summary","title":"Summary","text":"

    This release fixes a bug introduced in release 3.7.2 which could yield quadratic complexity in destructor calls. All changes are backward-compatible.

    "},{"location":"home/releases/#bug-fixes","title":"Bug Fixes","text":"
    • Removed reserve() calls from the destructor which could lead to quadratic complexity. #1837 #1838
    "},{"location":"home/releases/#deprecated-functions","title":"Deprecated functions","text":"

    This release does not deprecate any functions. As an overview, the following functions have been deprecated in earlier versions and will be removed in the next major version (i.e., 4.0.0):

    • Function iterator_wrapper are deprecated. Please use the member function items() instead.
    • Functions friend std::istream& operator<<(basic_json&, std::istream&) and friend std::ostream& operator>>(const basic_json&, std::ostream&) are deprecated. Please use friend std::istream& operator>>(std::istream&, basic_json&) and friend operator<<(std::ostream&, const basic_json&) instead.
    "},{"location":"home/releases/#v372","title":"v3.7.2","text":"

    Files

    • include.zip (274 KB)
    • include.zip.asc (1 KB)
    • json.hpp (791 KB)
    • json.hpp.asc (1 KB)

    Release date: 2019-11-10 SHA-256: 0a65fcbbe1b334d3f45c9498e5ee28c3f3b2428aea98557da4a3ff12f0f14ad6 (json.hpp), 67f69c9a93b7fa0612dc1b6273119d2c560317333581845f358aaa68bff8f087 (include.zip)

    "},{"location":"home/releases/#summary_1","title":"Summary","text":"

    Project bad_json_parsers tested how JSON parser libraries react on deeply nested inputs. It turns out that this library segfaulted at a certain nesting depth. This bug was fixed with this release. Now the parsing is only bounded by the available memory. All changes are backward-compatible.

    "},{"location":"home/releases/#bug-fixes_1","title":"Bug Fixes","text":"
    • Fixed a bug that lead to stack overflow for deeply nested JSON values (objects, array) by changing the implementation of the destructor from a recursive to an iterative approach. #832, #1419, #1835
    "},{"location":"home/releases/#further-changes","title":"Further Changes","text":"
    • Added WhiteStone Bolt. #1830
    "},{"location":"home/releases/#deprecated-functions_1","title":"Deprecated functions","text":"

    This release does not deprecate any functions. As an overview, the following functions have been deprecated in earlier versions and will be removed in the next major version (i.e., 4.0.0):

    • Function iterator_wrapper are deprecated. Please use the member function items() instead.
    • Functions friend std::istream& operator<<(basic_json&, std::istream&) and friend std::ostream& operator>>(const basic_json&, std::ostream&) are deprecated. Please use friend std::istream& operator>>(std::istream&, basic_json&) and friend operator<<(std::ostream&, const basic_json&) instead.
    "},{"location":"home/releases/#v371","title":"v3.7.1","text":"

    Files

    • include.zip (273 KB)
    • include.zip.asc (1 KB)
    • json.hpp (789 KB)
    • json.hpp.asc (1 KB)

    Release date: 2019-11-06 SHA-256: b5ba7228f3c22a882d379e93d08eab4349458ee16fbf45291347994eac7dc7ce (json.hpp), 77b9f54b34e7989e6f402afb516f7ff2830df551c3a36973085e2c7a6b1045fe (include.zip)

    "},{"location":"home/releases/#summary_2","title":"Summary","text":"

    This release fixes several small bugs in the library. All changes are backward-compatible.

    "},{"location":"home/releases/#bug-fixes_2","title":"Bug Fixes","text":"
    • Fixed a segmentation fault when serializing std::int64_t minimum value. #1708 #1722
    • Fixed the contains() function for JSON Pointers. #1727 #1741
    • Fixed too lax SFINAE guard for conversion from std::pair and std::tuple to json. #1805 #1806 #1825 #1826
    • Fixed some regressions detected by UBSAN. Updated CI to use Clang-Tidy 7.1.0. #1716 #1728
    • Fixed integer truncation in iteration_proxy. #1797
    • Updated Hedley to v11 to fix a E2512 error in MSVC. #1799
    • Fixed a compile error in enum deserialization of non non-default-constructible types. #1647 #1821
    • Fixed the conversion from json to std::valarray.
    "},{"location":"home/releases/#improvements","title":"Improvements","text":"
    • The items() function can now be used with a custom string type. #1765
    • Made json_pointer::back const. #1764 #1769
    • Meson is part of the release archive. #1672 #1694
    • Improved documentation on the Meson and Spack package manager. #1694 #1720
    "},{"location":"home/releases/#further-changes_1","title":"Further Changes","text":"
    • Added GitHub Workflow with ubuntu-latest/GCC 7.4.0 as CI step.
    • Added GCC 9 to Travis CI to compile with C++20 support. #1724
    • Added MSVC 2019 to the AppVeyor CI. #1780
    • Added badge to fuzzing status.
    • Fixed some cppcheck warnings. #1760
    • Fixed several typos in the documentation. #1720 #1767 #1803
    • Added documentation on the JSON_THROW_USER, JSON_TRY_USER, and JSON_CATCH_USER macros to control user-defined exception handling.
    • Used GitHub's CODEOWNERS and SECURITY feature.
    • Removed GLOB from CMake files. #1779
    • Updated to Doctest 2.3.5.
    "},{"location":"home/releases/#deprecated-functions_2","title":"Deprecated functions","text":"

    This release does not deprecate any functions. As an overview, the following functions have been deprecated in earlier versions and will be removed in the next major version (i.e., 4.0.0):

    • Function iterator_wrapper are deprecated. Please use the member function items() instead.
    • Functions friend std::istream& operator<<(basic_json&, std::istream&) and friend std::ostream& operator>>(const basic_json&, std::ostream&) are deprecated. Please use friend std::istream& operator>>(std::istream&, basic_json&) and friend operator<<(std::ostream&, const basic_json&) instead.
    "},{"location":"home/releases/#v370","title":"v3.7.0","text":"

    Files

    • include.zip (143 KB)
    • include.zip.asc (1 KB)
    • json.hpp (782 KB)
    • json.hpp.asc (1 KB)

    Release date: 2019-07-28 SHA-256: a503214947952b69f0062f572cb74c17582a495767446347ce2e452963fc2ca4 (json.hpp), 541c34438fd54182e9cdc68dd20c898d766713ad6d901fb2c6e28ff1f1e7c10d (include.zip)

    "},{"location":"home/releases/#summary_3","title":"Summary","text":"

    This release introduces a few convenience functions and performs a lot of house keeping (bug fixes and small improvements). All changes are backward-compatible.

    "},{"location":"home/releases/#new-features","title":"New Features","text":"
    • Add overload of the contains function to check if a JSON pointer is valid without throwing exceptions, just like its counterpart for object keys. #1600
    • Add a function to_string to allow for generic conversion to strings. #916 #1585
    • Add return value for the emplace_back function, returning a reference to the added element just like C++17 is introducing this for std::vector. #1609
    • Add info how to use the library with the pacman package manager on MSYS2. #1670
    "},{"location":"home/releases/#bug-fixes_3","title":"Bug Fixes","text":"
    • Fix an issue where typedefs with certain names yielded a compilation error. #1642 #1643
    • Fix a conversion to std::string_view in the unit tests. #1634 #1639
    • Fix MSVC Debug build. #1536 #1570 #1608
    • Fix get_to method to clear existing content before writing. #1511 #1555
    • Fix a -Wc++17-extensions warning. nodiscard attributes are now only used with Clang when -std=c++17 is used. #1535 #1551
    "},{"location":"home/releases/#improvements_1","title":"Improvements","text":"
    • Switch from Catch to doctest for the unit tests which speeds up compilation and runtime of the 112,112,308 tests.
    • Add an explicit section to the README about the frequently addressed topics character encoding, comments in JSON, and the order of object keys.
    "},{"location":"home/releases/#further-changes_2","title":"Further Changes","text":"
    • Use GNUInstallDirs to set library install directories. #1673
    • Fix links in the README. #1620 #1621 #1622 #1623 #1625
    • Mention json type on the documentation start page. #1616
    • Complete documentation of value() function with respect to type_error.302 exception. #1601
    • Fix links in the documentation. #1598
    • Add regression tests for MSVC. #1543 #1570
    • Use CircleCI for continuous integration.
    • Use Doozer for continuous integration on Linux (CentOS, Raspbian, Fedora)
    • Add tests to check each CMake flag (JSON_BuildTests, JSON_Install, JSON_MultipleHeaders, JSON_Sanitizer, JSON_Valgrind, JSON_NoExceptions, JSON_Coverage).
    • Use Hedley to avoid re-inventing several compiler-agnostic feature macros like JSON_DEPRECATED, JSON_NODISCARD, JSON_LIKELY, JSON_UNLIKELY, JSON_HAS_CPP_14, or JSON_HAS_CPP_17. Functions taking or returning pointers are annotated accordingly when a pointer will not be null.
    • Build and run tests on AppVeyor in DEBUG and RELEASE mode.
    "},{"location":"home/releases/#deprecated-functions_3","title":"Deprecated functions","text":"

    This release does not deprecate any functions. As an overview, the following functions have been deprecated in earlier versions and will be removed in the next major version (i.e., 4.0.0):

    • Function iterator_wrapper are deprecated. Please use the member function items() instead.
    • Functions friend std::istream& operator<<(basic_json&, std::istream&) and friend std::ostream& operator>>(const basic_json&, std::ostream&) are deprecated. Please use friend std::istream& operator>>(std::istream&, basic_json&) and friend operator<<(std::ostream&, const basic_json&) instead.
    "},{"location":"home/releases/#v361","title":"v3.6.1","text":"

    Files

    • include.zip (136 KB)
    • include.zip.asc (1 KB)
    • json.hpp (711 KB)
    • json.hpp.asc (1 KB)

    Release date: 2019-03-20 SHA-256: d2eeb25d2e95bffeb08ebb7704cdffd2e8fca7113eba9a0b38d60a5c391ea09a (json.hpp), 69cc88207ce91347ea530b227ff0776db82dcb8de6704e1a3d74f4841bc651cf (include.zip)

    "},{"location":"home/releases/#summary_4","title":"Summary","text":"

    This release fixes a regression and a bug introduced by the earlier 3.6.0 release. All changes are backward-compatible.

    "},{"location":"home/releases/#bug-fixes_4","title":"Bug Fixes","text":"
    • Fixed regression of #590 which could lead to compilation errors with GCC 7 and GCC 8. #1530
    • Fixed a compilation error when <Windows.h> was included. #1531
    "},{"location":"home/releases/#further-changes_3","title":"Further Changes","text":"
    • Fixed a warning for missing field initializers. #1527
    "},{"location":"home/releases/#deprecated-functions_4","title":"Deprecated functions","text":"

    This release does not deprecate any functions. As an overview, the following functions have been deprecated in earlier versions and will be removed in the next major version (i.e., 4.0.0):

    • Function iterator_wrapper are deprecated. Please use the member function items() instead.
    • Functions friend std::istream& operator<<(basic_json&, std::istream&) and friend std::ostream& operator>>(const basic_json&, std::ostream&) are deprecated. Please use friend std::istream& operator>>(std::istream&, basic_json&) and friend operator<<(std::ostream&, const basic_json&) instead.
    "},{"location":"home/releases/#v360","title":"v3.6.0","text":"

    Files

    • include.zip (136 KB)
    • include.zip.asc (1 KB)
    • json.hpp (711 KB)
    • json.hpp.asc (1 KB)

    Release date: 2019-03-20 SHA-256: ce9839370f28094c71107c405affb3b08c4a098154988014cbb0800b1c44a831 (json.hpp), 237c5e66e7f8186a02804ce9dbd5f69ce89fe7424ef84adf6142e973bd9532f4 (include.zip)

    \u2139\ufe0f This release introduced a regression. Please update to version 3.6.1!

    "},{"location":"home/releases/#summary_5","title":"Summary","text":"

    This release adds some convenience functions for JSON Pointers, introduces a contains function to check if a key is present in an object, and improves the performance of integer serialization. Furthermore, a lot of small bug fixes and improvements have been made. All changes are backward-compatible.

    "},{"location":"home/releases/#new-features_1","title":"New Features","text":"
    • Overworked the public interface for JSON Pointers. The creation of JSON Pointers is simplified with operator/ and operator/=. JSON Pointers can be inspected with empty, back, and parent_pointer, and manipulated with push_back and pop_back. #1434
    • Added a boolean method contains to check whether an element exists in a JSON object with a given key. Returns false when called on non-object types. #1471 #1474
    "},{"location":"home/releases/#bug-fixes_5","title":"Bug Fixes","text":"
    • Fixed a compilation issues with libc 2.12. #1483 #1514
    • Fixed endian conversion on PPC64. #1489
    • Fixed library to compile with GCC 9. #1472 #1492
    • Fixed a compilation issue with GCC 7 on CentOS. #1496
    • Fixed an integer overflow. #1447
    • Fixed buffer flushing in serializer. #1445 #1446
    "},{"location":"home/releases/#improvements_2","title":"Improvements","text":"
    • The performance of dumping integers has been greatly improved. #1411
    • Added CMake parameter JSON_Install to control whether the library should be installed (default: on). #1330
    • Fixed a lot of compiler and linter warnings. #1400 #1435 #1502
    • Reduced required CMake version from 3.8 to 3.1. #1409 #1428 #1441 #1498
    • Added nodiscard attribute to meta(), array(), object(), from_cbor, from_msgpack, from_ubjson, from_bson, and parse. #1433
    "},{"location":"home/releases/#further-changes_4","title":"Further Changes","text":"
    • Added missing headers. #1500
    • Fixed typos and broken links in README. #1417 #1423 #1425 #1451 #1455 #1491
    • Fixed documentation of parse function. #1473
    • Suppressed warning that cannot be fixed inside the library. #1401 #1468
    • Imroved package manager suppert:
      • Updated Buckaroo instructions. #1495
      • Improved Meson support. #1463
      • Added Conda package manager documentation. #1430
      • Added NuGet package manager documentation. #1132
    • Continuous Integration
      • Removed unstable or deprecated Travis builders (Xcode 6.4 - 8.2) and added Xcode 10.1 builder.
      • Added Clang 7 to Travis CI.
      • Fixed AppVeyor x64 builds. #1374 #1414
    • Updated thirdparty libraries:
      • Catch 1.12.0 -> 1.12.2
      • Google Benchmark 1.3.0 -> 1.4.1
      • Doxygen 1.8.15 -> 1.8.16
    "},{"location":"home/releases/#deprecated-functions_5","title":"Deprecated functions","text":"

    This release does not deprecate any functions. As an overview, the following functions have been deprecated in earlier versions and will be removed in the next major version (i.e., 4.0.0):

    • Function iterator_wrapper are deprecated. Please use the member function items() instead.
    • Functions friend std::istream& operator<<(basic_json&, std::istream&) and friend std::ostream& operator>>(const basic_json&, std::ostream&) are deprecated. Please use friend std::istream& operator>>(std::istream&, basic_json&) and friend operator<<(std::ostream&, const basic_json&) instead.
    "},{"location":"home/releases/#v350","title":"v3.5.0","text":"

    Files

    • include.zip (133 KB)
    • include.zip.asc (1 KB)
    • json.hpp (693 KB)
    • json.hpp.asc (1 KB)

    Release date: 2018-12-22 SHA-256: 8a6dbf3bf01156f438d0ca7e78c2971bca50eec4ca6f0cf59adf3464c43bb9d5 (json.hpp), 3564da9c5b0cf2e032f97c69baedf10ddbc98030c337d0327a215ea72259ea21 (include.zip)

    "},{"location":"home/releases/#summary_6","title":"Summary","text":"

    This release introduces the support for structured bindings and reading from FILE*. Besides, a few bugs have been fixed. All changes are backward-compatible.

    "},{"location":"home/releases/#new-features_2","title":"New Features","text":"

    • Structured bindings are now supported for JSON objects and arrays via the items() member function, so finally this code is possible: 

      for (auto& [key, val] : j.items()) {\n    std::cout << key << ':' << val << '\\n';\n}\n
      #1388 #1391

    • Added support for reading from FILE* to support situations in which streams are nit available or would require too much RAM. #1370 #1392

    "},{"location":"home/releases/#bug-fixes_6","title":"Bug Fixes","text":"
    • The eofbit was not set for input streams when the end of a stream was reached while parsing. #1340 #1343
    • Fixed a bug in the SAX parser for BSON arrays.
    "},{"location":"home/releases/#improvements_3","title":"Improvements","text":"
    • Added support for Clang 5.0.1 (PS4 version). #1341 #1342
    "},{"location":"home/releases/#further-changes_5","title":"Further Changes","text":"
    • Added a warning for implicit conversions to the documentation: It is not recommended to use implicit conversions when reading from a JSON value. Details about this recommendation can be found here. #1363
    • Fixed typos in the documentation. #1329 #1380 #1382
    • Fixed a C4800 warning. #1364
    • Fixed a -Wshadow warning #1346
    • Wrapped std::snprintf calls to avoid error in MSVC. #1337
    • Added code to allow installation via Meson. #1345
    "},{"location":"home/releases/#deprecated-functions_6","title":"Deprecated functions","text":"

    This release does not deprecate any functions. As an overview, the following functions have been deprecated in earlier versions and will be removed in the next major version (i.e., 4.0.0):

    • Function iterator_wrapper are deprecated. Please use the member function items() instead.
    • Functions friend std::istream& operator<<(basic_json&, std::istream&) and friend std::ostream& operator>>(const basic_json&, std::ostream&) are deprecated. Please use friend std::istream& operator>>(std::istream&, basic_json&) and friend operator<<(std::ostream&, const basic_json&) instead.
    "},{"location":"home/releases/#v340","title":"v3.4.0","text":"

    Files

    • include.zip (132 KB)
    • include.zip.asc (1 KB)
    • json.hpp (689 KB)
    • json.hpp.asc (1 KB)

    Release date: 2018-10-30 SHA-256: 63da6d1f22b2a7bb9e4ff7d6b255cf691a161ff49532dcc45d398a53e295835f (json.hpp), bfec46fc0cee01c509cf064d2254517e7fa80d1e7647fea37cf81d97c5682bdc (include.zip)

    "},{"location":"home/releases/#summary_7","title":"Summary","text":"

    This release introduces three new features:

    • BSON (Binary JSON) is next to CBOR, MessagePack, and UBJSON the fourth binary (de)serialization format supported by the library.
    • Adjustable error handlers for invalid Unicode allows to specify the behavior when invalid byte sequences are serialized.
    • Simplified enum/JSON mapping with a macro in case the default mapping to integers is not desired.

    Furthermore, some effort has been invested in improving the parse error messages. Besides, a few bugs have been fixed. All changes are backward-compatible.

    "},{"location":"home/releases/#new-features_3","title":"New Features","text":"
    • The library can read and write a subset of BSON (Binary JSON). All data types known from JSON are supported, whereas other types more tied to MongoDB such as timestamps, object ids, or binary data are currently not implemented. See the README for examples. #1244 #1320
    • The behavior when the library encounters an invalid Unicode sequence during serialization can now be controlled by defining one of three Unicode error handlers: (1) throw an exception (default behavior), (2) replace invalid sequences by the Unicode replacement character (U+FFFD), or (3) ignore/filter invalid sequences. See the documentation of the dump function for examples. #1198 #1314
    • To easily specify a user-defined enum/JSON mapping, a macro NLOHMANN_JSON_SERIALIZE_ENUM has been introduced. See the README section for more information. #1208 #1323
    "},{"location":"home/releases/#bug-fixes_7","title":"Bug Fixes","text":"
    • fixed truncation #1286 #1315
    • fixed an issue with std::pair #1299 #1301
    • fixed an issue with std::variant #1292 #1294
    • fixed a bug in the JSON Pointer parser
    "},{"location":"home/releases/#improvements_4","title":"Improvements","text":"
    • The diagnosis messages for parse errors have been improved: error messages now indicated line/column positions where possible (in addition to a byte count) and also the context in which the error occurred (e.g., \"while parsing a JSON string\"). Example: error parse error at 2: syntax error - invalid string: control character must be escaped; last read: '<U+0009>' is now reported as parse error at line 1, column 2: syntax error while parsing value - invalid string: control character U+0009 (HT) must be escaped to \\u0009 or \\t; last read: '<U+0009>'. #1280 #1288 #1303
    "},{"location":"home/releases/#further-changes_6","title":"Further Changes","text":"
    • improved Meson documentation #1305
    • fixed some more linter warnings #1280
    • fixed Clang detection for third-party Google Benchmark library #1277
    "},{"location":"home/releases/#deprecated-functions_7","title":"Deprecated functions","text":"

    This release does not deprecate any functions. As an overview, the following functions have been deprecated in earlier versions and will be removed in the next major version (i.e., 4.0.0):

    • Function iterator_wrapper are deprecated. Please use the member function items() instead.
    • Functions friend std::istream& operator<<(basic_json&, std::istream&) and friend std::ostream& operator>>(const basic_json&, std::ostream&) are deprecated. Please use friend std::istream& operator>>(std::istream&, basic_json&) and friend operator<<(std::ostream&, const basic_json&) instead.
    "},{"location":"home/releases/#v330","title":"v3.3.0","text":"

    Files

    • include.zip (123 KB)
    • include.zip.asc (1 KB)
    • json.hpp (635 KB)
    • json.hpp.asc (1 KB)

    Release date: 2018-10-05 SHA-256: f1327bb60c58757a3dd2b0c9c45d49503d571337681d950ec621f8374bcc14d4 (json.hpp), 9588d63557333aaa485e92221ec38014a85a6134e7486fe3441e0541a5a89576 (include.zip)

    "},{"location":"home/releases/#summary_8","title":"Summary","text":"

    This release adds support for GCC 4.8. Furthermore, it adds a function get_to to write a JSON value to a passed reference. Another topic of this release was the CMake support which has been overworked and documented.

    Besides, a lot of bugs have been fixed and slight improvements have been made. All changes are backward-compatible.

    "},{"location":"home/releases/#new-features_4","title":"New Features","text":"
    • The library can now also built with GCC 4.8. Though this compiler does not fully support C++11, it can successfully compile and run the test suite. Note that bug 57824 in GCC 4.8 still forbids to use multiline raw strings in arguments to macros. #1257
    • Added new function get_to to write a JSON value to a passed reference. The destination type is automatically derived which allows more succinct code compared to the get function. #1227 #1231
    "},{"location":"home/releases/#bug-fixes_8","title":"Bug Fixes","text":"
    • Fixed a bug in the CMake file that made target_link_libraries to not properly include nlohmann_json. #1243 #1245 #1260
    • Fixed a warning in MSVC 2017 complaining about a constexpr if. #1204 #1268 #1272
    • Fixed a bug that prevented compilation with ICPC. #755 #1222
    • Improved the SFINAE correctness to fix a bug in the conversion operator. #1237 #1238
    • Fixed a -Wctor-dtor-privacy warning. #1224
    • Fixed a warning on a lambda in unevaluated context. #1225 #1230
    • Fixed a bug introduced in version 3.2.0 where defining JSON_CATCH_USER led to duplicate macro definition of JSON_INTERNAL_CATCH. #1213 #1214
    • Fixed a bug that prevented compilation with Clang 3.4.2 in RHEL 7. #1179 #1249
    "},{"location":"home/releases/#improvements_5","title":"Improvements","text":"
    • Added documentation on CMake integration of the library. #1270
    • Changed the CMake file to use find_package(nlohmann_json) without installing the library. #1202
    • Improved error messages in case operator[] is used with the wrong combination (json.exception.type_error.305) of JSON container type and argument type. Example: \"cannot use operator[] with a string argument\". #1220 #1221
    • Added a license and version information to the Meson build file. #1252
    • Removed static assertions to indicated missing to_json or from_json functions as such assertions do not play well with SFINAE. These assertions also led to problems with GMock. #960 #1212 #1228
    • The test suite now does not wait forever if run in a wrong directory and input files are not found. #1262
    • The test suite does not show deprecation warnings for deprecated functions which frequently led to confusion. #1271
    "},{"location":"home/releases/#further-changes_7","title":"Further Changes","text":"
    • GCC 4.8 and Xcode 10 were added to the continuous integration suite at Travis.
    • Added lgtm checks to pull requests.
    • Added tests for CMake integration. #1260
    "},{"location":"home/releases/#deprecated-functions_8","title":"Deprecated functions","text":"

    This release does not deprecate any functions. As an overview, the following functions have been deprecated in earlier versions and will be removed in the next major version (i.e., 4.0.0):

    • Function iterator_wrapper are deprecated. Please use the member function items() instead.
    • Functions friend std::istream& operator<<(basic_json&, std::istream&) and friend std::ostream& operator>>(const basic_json&, std::ostream&) are deprecated. Please use friend std::istream& operator>>(std::istream&, basic_json&) and friend operator<<(std::ostream&, const basic_json&) instead.
    "},{"location":"home/releases/#v320","title":"v3.2.0","text":"

    Files

    • include.zip (124 KB)
    • include.zip.asc (1 KB)
    • json.hpp (636 KB)
    • json.hpp.asc (1 KB)

    Release date: 2018-08-20 SHA-256: ce6b5610a051ec6795fa11c33854abebb086f0fd67c311f5921c3c07f9531b44 (json.hpp), 35ee642558b90e2f9bc758995c4788c4b4d4dec54eef95fb8f38cb4d49c8fc7c (include.zip)

    "},{"location":"home/releases/#summary_9","title":"Summary","text":"

    This release introduces a SAX interface to the library. While this may be a very special feature used by only few people, it allowed to unify all functions that consumed input and created some kind of JSON value. Internally, now all existing functions like parse, accept, from_cbor, from_msgpack, and from_ubjson use the SAX interface with different event processors. This allowed to separate the input processing from the value generation. Furthermore, throwing an exception in case of a parse error is now optional and up to the event processor. Finally, the JSON parser is now non-recursive (meaning it does not use the call stack, but std::vector<bool> to track the hierarchy of structured values) which allows to process nested input more efficiently.

    Furthermore, the library finally is able to parse from wide string types. This is the first step toward opening the library from UTF-8 to UTF-16 and UTF-32.

    This release further fixes several bugs in the library. All changes are backward-compatible.

    "},{"location":"home/releases/#new-features_5","title":"New Features","text":"
    • added a parser with a SAX interface (#971, #1153)
    • support to parse from wide string types std::wstring, std::u16string, and std::u32string; the input will be converted to UTF-8 (#1031)
    • added support for std::string_view when using C++17 (#1028)
    • allow to roundtrip std::map and std::unordered_map from JSON if key type is not convertible to string; in these cases, values are serialized to arrays of pairs (#1079, #1089, #1133, #1138)
    "},{"location":"home/releases/#bug-fixes_9","title":"Bug Fixes","text":"
    • allow to create nullptr_t from JSON allowing to properly roundtrip null values (#1169)
    • allow compare user-defined string types (#1130)
    • better support for algorithms using iterators from items() (#1045, #1134)
    • added parameter to avoid compilation error with MSVC 2015 debug builds (#1114)
    • re-added accidentally skipped unit tests (#1176)
    • fixed MSVC issue with std::swap (#1168)
    "},{"location":"home/releases/#improvements_6","title":"Improvements","text":"
    • key() function for iterators returns a const reference rather than a string copy (#1098)
    • binary formats CBOR, MessagePack, and UBJSON now supports float as type for floating-point numbers (#1021)
    "},{"location":"home/releases/#further-changes_8","title":"Further Changes","text":"
    • changed issue templates
    • improved continuous integration: added builders for Xcode 9.3 and 9.4, added builders for GCC 8 and Clang 6, added builder for MinGW, added builders for MSVC targeting x86
    • required CMake version is now at least 3.8 (#1040)
    • overworked CMake file wrt. packaging (#1048)
    • added package managers: Spack (#1041) and CocoaPods (#1148)
    • fixed Meson include directory (#1142)
    • preprocessor macro JSON_SKIP_UNSUPPORTED_COMPILER_CHECK can skip the rejection of unsupported compilers - use at your own risk! (#1128)
    • preprocessor macro JSON_INTERNAL_CATCH/JSON_INTERNAL_CATCH_USER allows to control the behavior of exception handling inside the library (#1187)
    • added note on char to JSON conversion
    • added note how to send security-related issue via encrypted email
    • removed dependency to std::stringstream (#1117)
    • added SPDX-License-Identifier
    • added updated JSON Parsing Test Suite, described in Parsing JSON is a Minefield \ud83d\udca3
    • updated to Catch 1.12.0
    "},{"location":"home/releases/#deprecated-functions_9","title":"Deprecated functions","text":"

    This release does not deprecate any functions. As an overview, the following functions have been deprecated in earlier versions and will be removed in the next major version (i.e., 4.0.0):

    • Function iterator_wrapper are deprecated. Please use the member function items() instead.
    • Functions friend std::istream& operator<<(basic_json&, std::istream&) and friend std::ostream& operator>>(const basic_json&, std::ostream&) are deprecated. Please use friend std::istream& operator>>(std::istream&, basic_json&) and friend operator<<(std::ostream&, const basic_json&) instead.
    "},{"location":"home/releases/#v312","title":"v3.1.2","text":"

    Files

    • include.zip (115 KB)
    • include.zip.asc (1 KB)
    • json.hpp (582 KB)
    • json.hpp.asc (1 KB)

    Release date: 2018-03-14 SHA-256: fbdfec4b4cf63b3b565d09f87e6c3c183bdd45c5be1864d3fcb338f6f02c1733 (json.hpp), 495362ee1b9d03d9526ba9ccf1b4a9c37691abe3a642ddbced13e5778c16660c (include.zip)

    "},{"location":"home/releases/#summary_10","title":"Summary","text":"

    This release fixes several bugs in the library. All changes are backward-compatible.

    "},{"location":"home/releases/#bug-fixes_10","title":"Bug Fixes","text":"
    • Fixed a memory leak occurring in the parser callback (#1001).
    • Different specializations of basic_json (e.g., using different template arguments for strings or objects) can now be used in assignments (#972, #977, #986).
    • Fixed a logical error in an iterator range check (#992).
    "},{"location":"home/releases/#improvements_7","title":"Improvements","text":"
    • The parser and the serialization now support user-defined string types (#1006, #1009).
    "},{"location":"home/releases/#further-changes_9","title":"Further Changes","text":"
    • Clang Analyzer is now used as additional static analyzer; see make clang_analyze.
    • Overworked README by adding links to the documentation (#981).
    "},{"location":"home/releases/#deprecated-functions_10","title":"Deprecated functions","text":"

    This release does not deprecate any functions. As an overview, the following functions have been deprecated in earlier versions and will be removed in the next major version (i.e., 4.0.0):

    • Function iterator_wrapper are deprecated. Please use the member function items() instead.
    • Functions friend std::istream& operator<<(basic_json&, std::istream&) and friend std::ostream& operator>>(const basic_json&, std::ostream&) are deprecated. Please use friend std::istream& operator>>(std::istream&, basic_json&) and friend operator<<(std::ostream&, const basic_json&) instead.
    "},{"location":"home/releases/#v311","title":"v3.1.1","text":"

    Files

    • include.zip (114 KB)
    • include.zip.asc (1 KB)
    • json.hpp (577 KB)
    • json.hpp.asc (1 KB)

    Release date: 2018-02-13 SHA-256: e14ce5e33d6a2daf748026bd4947f3d9686ca4cfd53d10c3da46a0a9aceb7f2e (json.hpp), fde771d4b9e4f222965c00758a2bdd627d04fb7b59e09b7f3d1965abdc848505 (include.zip)

    "},{"location":"home/releases/#summary_11","title":"Summary","text":"

    This release fixes several bugs in the library. All changes are backward-compatible.

    "},{"location":"home/releases/#bug-fixes_11","title":"Bug Fixes","text":"
    • Fixed parsing of CBOR strings with indefinite length (#961). Earlier versions of this library misinterpreted the CBOR standard and rejected input with the 0x7F start byte.
    • Fixed user-defined conversion to vector type (#924, #969). A wrong SFINAE check rejected code though a user-defined conversion was provided.
    • Fixed documentation of the parser behavior for objects with duplicate keys (#963). The exact behavior is not specified by RFC 8259 and the library now also provides no guarantee which object key is stored.
    • Added check to detect memory overflow when parsing UBJSON containers (#962). The optimized UBJSON format allowed for specifying an array with billions of null elements with a few bytes and the library did not check whether this size exceeded max_size().
    "},{"location":"home/releases/#further-changes_10","title":"Further Changes","text":"
    • Code coverage is now calculated for the individual header files, allowing to find uncovered lines more quickly than by browsing through the single header version (#953, #957).
    • A Makefile target run_benchmarks was added to quickly build and run the benchmark suite.
    • The documentation was harmonized with respect to the header inclusion (#955). Now all examples and the README use #include <nlohmann/json.hpp> to allow for selecting single_include or include or whatever installation folder as include directory.
    • Added note on how to use the library with the cget package manager (#954).
    "},{"location":"home/releases/#deprecated-functions_11","title":"Deprecated functions","text":"

    This release does not deprecate any functions. As an overview, the following functions have been deprecated in earlier versions and will be removed in the next major version (i.e., 4.0.0):

    • Function iterator_wrapper are deprecated. Please use the member function items() instead.
    • Functions friend std::istream& operator<<(basic_json&, std::istream&) and friend std::ostream& operator>>(const basic_json&, std::ostream&) are deprecated. Please use friend std::istream& operator>>(std::istream&, basic_json&) and friend operator<<(std::ostream&, const basic_json&) instead.
    "},{"location":"home/releases/#v310","title":"v3.1.0","text":"

    Files

    • include.zip (114 KB)
    • include.zip.asc (1 KB)
    • json.hpp (577 KB)
    • json.hpp.asc (1 KB)

    Release date: 2018-02-01 SHA-256: d40f614d10a6e4e4e80dca9463da905285f20e93116c36d97d4dc1aa63d10ba4 (json.hpp), 2b7234fca394d1e27b7e017117ed80b7518fafbb4f4c13a7c069624f6f924673 (include.zip)

    "},{"location":"home/releases/#summary_12","title":"Summary","text":"

    This release adds support for the UBJSON format and JSON Merge Patch. It also contains some minor changes and bug fixes. All changes are backward-compatible.

    "},{"location":"home/releases/#new-features_6","title":"New features","text":"
    • The library now supports UBJSON (Universal Binary JSON Specification) as binary format to read and write JSON values space-efficiently. See the documentation overview for a comparison of the different formats CBOR, MessagePack, and UBJSON.
    • JSON Merge Patch (RFC 7386) offers an intuitive means to describe patches between JSON values (#876, #877). See the documentation of merge_patch for more information.
    "},{"location":"home/releases/#improvements_8","title":"Improvements","text":"
    • The library now uses the Grisu2 algorithm for printing floating-point numbers (based on the reference implementation by Florian Loitsch) which produces a short representation which is guaranteed to round-trip (#360, #935, #936).
    • The UTF-8 handling was further simplified by using the decoder of Bj\u00f6rn Hoehrmann in more scenarios.
    "},{"location":"home/releases/#reorganization","title":"Reorganization","text":"
    • Though the library is released as a single header, its development got more and more complicated. With this release, the header is split into several files and the single-header file json.hpp can be generated from these development sources. In the repository, folder include contains the development sources and single_include contains the single json.hpp header (#700, #906, #907, #910, #911, #915, #920, #924, #925, #928, #944).
    • The split further allowed for a forward declaration header include/nlohmann/json_fwd.hpp to speed up compilation times (#314).
    "},{"location":"home/releases/#further-changes_11","title":"Further changes","text":"
    • Google Benchmark is now used for micro benchmarks (see benchmarks folder, #921).
    • The serialization (JSON and binary formats) now properly work with the libraries string template parameter, allowing for optimized string implementations to be used in constraint environments such as embedded software (#941, #950).
    • The exceptional behavior can now be overridden by defining macros JSON_THROW_USER, JSON_TRY_USER, and JSON_CATCH_USER, defining the behavior of throw, try and catch, respectively. This allows to switch off C++'s exception mechanism yet still execute user-defined code in case an error condition occurs (#938).
    • To facilitate the interplay with flex and Bison, the library does not use the variable name yytext any more as it could clash with macro definitions (#933).
    • The library now defines NLOHMANN_JSON_VERSION_MAJOR, NLOHMANN_JSON_VERSION_MINOR, and NLOHMANN_JSON_VERSION_PATCH to allow for conditional compilation based on the included library version (#943, #948).
    • A compilation error with ICC has been fixed (#947).
    • Typos and links in the documentation have been fixed (#900, #930).
    • A compiler error related to incomplete types has been fixed (#919).
    • The tests form the UTF-8 decoder stress test have been added to the test suite.
    "},{"location":"home/releases/#deprecated-functions_12","title":"Deprecated functions","text":"
    • Function iterator_wrapper has been deprecated (#874). Since its introduction, the name was up for discussion, as it was too technical. We now introduced the member function items() with the same semantics. iterator_wrapper will be removed in the next major version (i.e., 4.0.0).

    Furthermore, the following functions are deprecated since version 3.0.0 and will be removed in the next major version (i.e., 4.0.0):

    • friend std::istream& operator<<(basic_json&, std::istream&)
    • friend std::ostream& operator>>(const basic_json&, std::ostream&)

    Please use friend std::istream& operator>>(std::istream&, basic_json&) and friend operator<<(std::ostream&, const basic_json&) instead.

    "},{"location":"home/releases/#v301","title":"v3.0.1","text":"

    Files

    • json.hpp (502 KB)
    • json.hpp.asc (1 KB)

    Release date: 2017-12-29 SHA-256: c9b3591f1bb94e723a0cd7be861733a3a555b234ef132be1e9027a0364118c4c

    "},{"location":"home/releases/#summary_13","title":"Summary","text":"

    This release fixes small issues in the implementation of JSON Pointer and JSON Patch. All changes are backward-compatible.

    "},{"location":"home/releases/#changes","title":"Changes","text":"
    • The \"copy\" operation of JSON Patch (RFC 6902) requests that it is an error if the target path points into a non-existing array or object (see #894 for a detailed description). This release fixes the implementation to detect such invalid target paths and throw an exception.
    • An array index in a JSON Pointer (RFC 6901) must be an integer. This release fixes the implementation to throw an exception in case invalid array indices such as 10e2 are used.
    • Added the JSON Patch tests from Byron Ruth and Mike McCabe.
    • Fixed the documentation of the at(ptr) function with JSON Pointers to list all possible exceptions (see #888).
    • Updated the container overview documentation (see #883).
    • The CMake files now respect the BUILD_TESTING option (see #846, #885)
    • Fixed some compiler warnings (see #858, #882).
    "},{"location":"home/releases/#deprecated-functions_13","title":"Deprecated functions","text":"

    To unify the interfaces and to improve similarity with the STL, the following functions are deprecated since version 3.0.0 and will be removed in the next major version (i.e., 4.0.0):

    • friend std::istream& operator<<(basic_json&, std::istream&)
    • friend std::ostream& operator>>(const basic_json&, std::ostream&)

    Please use friend std::istream& operator>>(std::istream&, basic_json&) and friend operator<<(std::ostream&, const basic_json&) instead.

    "},{"location":"home/releases/#v300","title":"v3.0.0","text":"

    Files

    • json.hpp (501 KB)
    • json.hpp.asc (1 KB)

    Release date: 2017-12-17 SHA-256: 076d4a0cb890a3c3d389c68421a11c3d77c64bd788e85d50f1b77ed252f2a462

    "},{"location":"home/releases/#summary_14","title":"Summary","text":"

    After almost a year, here is finally a new release of JSON for Modern C++, and it is a major one! As we adhere to semantic versioning, this means the release includes some breaking changes, so please read the next section carefully before you update. But don't worry, we also added a few new features and put a lot of effort into fixing a lot of bugs and straighten out a few inconsistencies.

    "},{"location":"home/releases/#breaking-changes","title":"Breaking changes","text":"

    This section describes changes that change the public API of the library and may require changes in code using a previous version of the library. In section \"Moving from 2.x.x to 3.0.0\" at the end of the release notes, we describe in detail how existing code needs to be changed.

    • The library now uses user-defined exceptions instead of re-using those defined in <stdexcept> (#244). This not only allows to add more information to the exceptions (every exception now has an identifier, and parse errors contain the position of the error), but also to easily catch all library exceptions with a single catch(json::exception).
    • When strings with a different encoding as UTF-8 were stored in JSON values, their serialization could not be parsed by the library itself, as only UTF-8 is supported. To enforce this library limitation and improve consistency, non-UTF-8 encoded strings now yield a json::type_error exception during serialization (#838). The check for valid UTF-8 is realized with code from Bj\u00f6rn Hoehrmann.
    • NaN and infinity values can now be stored inside the JSON value without throwing an exception. They are, however, still serialized as null (#388).
    • The library's iterator tag was changed from RandomAccessIterator to BidirectionalIterator (#593). Supporting RandomAccessIterator was incorrect as it assumed an ordering of values in a JSON objects which are unordered by definition.
    • The library does not include the standard headers <iostream>, <ctype>, and <stdexcept> any more. You may need to add these headers to code relying on them.
    • Removed constructor explicit basic_json(std::istream& i, const parser_callback_t cb = nullptr) which was deprecated in version 2.0.0 (#480).
    "},{"location":"home/releases/#deprecated-functions_14","title":"Deprecated functions","text":"

    To unify the interfaces and to improve similarity with the STL, the following functions are now deprecated and will be removed in the next major version (i.e., 4.0.0):

    • friend std::istream& operator<<(basic_json&, std::istream&)
    • friend std::ostream& operator>>(const basic_json&, std::ostream&)

    Please use friend std::istream& operator>>(std::istream&, basic_json&) and friend operator<<(std::ostream&, const basic_json&) instead.

    "},{"location":"home/releases/#new-features_7","title":"New features","text":"

    With all this breaking and deprecation out of the way, let's talk about features!

    • We improved the diagnostic information for syntax errors (#301). Now, an exception json::parse_error is thrown which contains a detailed message on the error, but also a member byte to indicate the byte offset in the input where the error occurred.
    • We added a non-throwing syntax check (#458): The new accept function returns a Boolean indicating whether the input is proper JSON. We also added a Boolean parameter allow_exceptions to the existing parse functions to return a discarded value in case a syntax error occurs instead of throwing an exception.
    • An update function was added to merge two JSON objects (#428). In case you are wondering: the name was inspired by Python.
    • The insert function now also supports an iterator range to add elements to an object.
    • The binary exchange formats CBOR and MessagePack can now be parsed from input streams and written to output streams (#477).
    • Input streams are now only read until the end of a JSON value instead of the end of the input (#367).
    • The serialization function dump now has two optional parameters ensure_ascii to escape all non-ASCII characters with \\uxxxx and an indent_char parameter to choose whether to indent with spaces or tabs (#654).
    • Added built-in type support for C arrays (#502), std::pair and std::tuple (#563, #614), enum and enum class (#545), std::vector<bool> (#494). Fixed support for std::valarray (#702), std::array (#553), and std::map<std::string, std::string> (#600, #607).
    "},{"location":"home/releases/#further-changes_12","title":"Further changes","text":"

    Furthermore, there have been a lot of changes under the hood:

    • Replaced the re2c generated scanner by a self-coded version which allows for a better modularization of the parser and better diagnostics. To test the new scanner, we added millions (8,860,608 to be exact) of unit tests to check all valid and invalid byte sequences of the Unicode standard.
    • Google's OSS-Fuzz is still constantly fuzz-testing the library and found several issues that were fixed in this release (#497, #504, #514, #516, #518, #519, #575).
    • We now also ignore UTF-8 byte order marks when parsing from an iterator range (#602).
    • Values can be now moved from initializer lists (#663).
    • Updated to Catch 1.9.7. Unfortunately, Catch2 currently has some performance issues.
    • The non-exceptional paths of the library are now annotated with __builtin_expect to optimize branch prediction as long as no error occurs.
    • MSVC now produces a stack trace in MSVC if a from_json or to_json function was not found for a user-defined type. We also added a debug visualizer nlohmann_json.natvis for better debugging in MSVC (#844).
    • Overworked the documentation and added even more examples.
    • The build workflow now relies on CMake and CTest. Special flags can be chosen with CMake, including coverage (JSON_Coverage), compilation without exceptions (JSON_NoExceptions), LLVM sanitizers (JSON_Sanitizer), or execution with Valgrind (JSON_Valgrind).
    • Added support for package managers Meson (#576), Conan (#566), Hunter (#671, #829), and vcpkg (#753).
    • Added CI builders: Xcode 8.3, 9.0, 9.1, and 9.2; GCC 7.2; Clang 3.8, 3.9, 4.0, and 5.0; Visual Studio 2017. The library is further built with C++17 settings on the latest Clang, GCC, and MSVC version to quickly detect new issues.
    "},{"location":"home/releases/#moving-from-2xx-to-300","title":"Moving from 2.x.x to 3.0.0","text":""},{"location":"home/releases/#user-defined-exceptions","title":"User-defined Exceptions","text":"

    There are five different exceptions inheriting from json::exception:

    • json::parse_error for syntax errors (including the binary formats),
    • json::invalid_iterator for errors related to iterators,
    • json::type_error for errors where functions were called with the wrong JSON type,
    • json::out_of_range for range errors, and
    • json::other_error for miscellaneous errors.

    To support these exception, the try/catch blocks of your code need to be adjusted:

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    • If an overflow occurs during parsing a number from a JSON text, an exception json::out_of_range is thrown so that the overflow is detected early and roundtripping is guaranteed.

    • NaN and INF floating-point values can be stored in a JSON value and are not replaced by null. That is, the basic_json class behaves like double in this regard (no exception occurs). However, NaN and INF are serialized to null.

    "},{"location":"home/releases/#removal-of-deprecated-functions","title":"Removal of deprecated functions","text":"

    Function explicit basic_json(std::istream& i, const parser_callback_t cb = nullptr) should be replaced by the parse function: Let ss be a stream and cb be a parse callback function.

    Old code:

    json j(ss, cb);\n

    New code:

    json j = json::parse(ss, cb);\n

    If no callback function is used, also the following code works:

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    "},{"location":"home/releases/#v211","title":"v2.1.1","text":"

    Files

    • json.hpp (437 KB)
    • json.hpp.asc (1 KB)

    Release date: 2017-02-25 SHA-256: faa2321beb1aa7416d035e7417fcfa59692ac3d8c202728f9bcc302e2d558f57

    "},{"location":"home/releases/#summary_15","title":"Summary","text":"

    This release fixes a locale-related bug in the parser. To do so, the whole number handling (lexer, parser, and also the serialization) have been overworked. Furthermore, a lot of small changes added up that were added to this release. All changes are backward-compatible.

    "},{"location":"home/releases/#changes_1","title":"Changes","text":"
    • Locales that have a different character than . as decimal separator (e.g., the Norwegian locale nb_NO.UTF-8) led to truncated number parsing or parse errors. The library now has been fixed to work with any locale. Note that . is still the only valid decimal separator for JSON input.
    • Numbers like 1.0 were correctly parsed as floating-point number, but serialized as integer (1). Now, floating-point numbers correctly round trip.
    • Parsing incorrect JSON numbers with leading 0 (0123) could yield a buffer overflow. This is fixed now by detecting such errors directly by the lexer.
    • Constructing a JSON value from a pointer was incorrectly interpreted as a Boolean; such code will now yield a compiler error.
    • Comparing a JSON number with 0 led to a comparison with null. This is fixed now.
    • All throw calls are now wrapped in macros.
    • Starting during the preparation of this release (since 8 February 2017), commits and released files are cryptographically signed with this GPG key. Previous releases have also been signed.
    • The parser for MessagePack and CBOR now supports an optional start index parameter to define a byte offset for the parser.
    • Some more warnings have been fixed. With Clang, the code compiles without warnings with -Weverything (well, it needs -Wno-documentation-unknown-command and -Wno-deprecated-declarations, but you get the point).
    • The code can be compiled easier with many Android NDKs by avoiding macros like UINT8_MAX which previously required defining a preprocessor macro for compilation.
    • The unit tests now compile two times faster.
    • Cotire is used to speed up the build.
    • Fixed a lot of typos in the documentation.
    • Added a section to the README file that lists all used third-party code/tools.
    • Added a note on constructing a string value vs. parsing.
    • The test suite now contains 11202597 unit tests.
    • Improved the Doxygen documentation by shortening the template parameters of class basic_json.
    • Removed Doozer.
    • Added Codacity.
    • Upgraded Catch to version 1.7.2.
    "},{"location":"home/releases/#v210","title":"v2.1.0","text":"

    Files

    • json.hpp (426 KB)
    • json.hpp.asc (1 KB)
    • Release date: 2017-01-28
    • SHA-256: a571dee92515b685784fd527e38405cf3f5e13e96edbfe3f03d6df2e363a767b
    "},{"location":"home/releases/#summary_16","title":"Summary","text":"

    This release introduces a means to convert from/to user-defined types. The release is backwards compatible.

    "},{"location":"home/releases/#changes_2","title":"Changes","text":"
    • The library now offers an elegant way to convert from and to arbitrary value types. All you need to do is to implement two functions: to_json and from_json. Then, a conversion is as simple as putting a = between variables. See the README for more information and examples.
    • Exceptions can now be switched off. This can be done by defining the preprocessor symbol JSON_NOEXCEPTION or by passing -fno-exceptions to your compiler. In case the code would usually thrown an exception, abort() is now called.
    • Information on the library can be queried with the new (static) function meta() which returns a JSON object with information on the version, compiler, and platform. See the documentation for an example.
    • A bug in the CBOR parser was fixed which led to a buffer overflow.
    • The function type_name() is now public. It allows to query the type of a JSON value as string.
    • Added the Big List of Naughty Strings as test case.
    • Updated to Catch v1.6.0.
    • Some typos in the documentation have been fixed.
    "},{"location":"home/releases/#v2010","title":"v2.0.10","text":"

    Files

    • json.hpp (409 KB)
    • json.hpp.asc (1 KB)
    • Release date: 2017-01-02
    • SHA-256: ec27d4e74e9ce0f78066389a70724afd07f10761009322dc020656704ad5296d
    "},{"location":"home/releases/#summary_17","title":"Summary","text":"

    This release fixes several security-relevant bugs in the MessagePack and CBOR parsers. The fixes are backwards compatible.

    "},{"location":"home/releases/#changes_3","title":"Changes","text":"
    • Fixed a lot of bugs in the CBOR and MesssagePack parsers. These bugs occurred if invalid input was parsed and then could lead in buffer overflows. These bugs were found with Google's OSS-Fuzz, see #405, #407, #408, #409, #411, and #412 for more information.
    • We now also use the Doozer continuous integration platform.
    • The complete test suite is now also run with Clang's address sanitizer and undefined-behavior sanitizer.
    • Overworked fuzz testing; CBOR and MessagePack implementations are now fuzz-tested. Furthermore, all fuzz tests now include a round trip which ensures created output can again be properly parsed and yields the same JSON value.
    • Clarified documentation of find() function to always return end() when called on non-object value types.
    • Moved thirdparty test code to test/thirdparty directory.
    "},{"location":"home/releases/#v209","title":"v2.0.9","text":"

    Files

    • json.hpp (406 KB)
    • json.hpp.asc (1 KB)
    • Release date: 2016-12-16
    • SHA-256: fbf3396f13e187d6c214c297bddc742d918ea9b55e10bfb3d9f458b9bfdc22e5
    "},{"location":"home/releases/#summary_18","title":"Summary","text":"

    This release implements with CBOR and MessagePack two binary serialization/deserialization formats. It further contains some small fixes and improvements. The fixes are backwards compatible.

    "},{"location":"home/releases/#changes_4","title":"Changes","text":"
    • The library can now read and write the binary formats CBOR (Concise Binary Object Representation) and MessagePack. Both formats are aimed to produce a very compact representation of JSON which can be parsed very efficiently. See the README file for more information and examples.
    • simplified the iteration implementation allowing to remove dozens of lines of code
    • fixed an integer overflow error detected by Google's OSS-Fuzz
    • suppressed documentation warnings inside the library to facilitate compilation with -Wdocumentation
    • fixed an overflow detection error in the number parser
    • updated contribution guidelines to a list of frequentely asked features that will most likely be never added to the library
    • added a table of contents to the README file to add some structure
    • mentioned the many examples and the documentation in the README file
    • split unit tests into individual independent binaries to speed up compilation and testing
    • the test suite now contains 11201886 tests
    "},{"location":"home/releases/#v208","title":"v2.0.8","text":"

    Files

    • json.hpp (360 KB)
    • json.hpp.asc (1 KB)
    • Release date: 2016-12-02
    • SHA-256: b70db0ad34f8e0e61dc3f0cbab88099336c9674c193d8a3439d93d6aca2d7120
    "},{"location":"home/releases/#summary_19","title":"Summary","text":"

    This release combines a lot of small fixes and improvements. The fixes are backwards compatible.

    "},{"location":"home/releases/#changes_5","title":"Changes","text":"
    • fixed a bug that froze the parser if a passed file was not found (now, std::invalid_argument is thrown)
    • fixed a bug that lead to an error of a file at EOF was parsed again (now, std::invalid_argument is thrown)
    • the well known functions emplace and emplace_back have been added to JSON values and work as expected
    • improved the performance of the serialization (dump function)
    • improved the performance of the deserialization (parser)
    • some continuous integration images at Travis were added and retired; see here for the current continuous integration setup
    • the Coverity scan works again
    • the benchmarking code has been improved to produce more stable results
    • the README file has been extended and includes more frequently asked examples
    • the test suite now contains 8905518 tests
    • updated Catch to version 1.5.8
    "},{"location":"home/releases/#v207","title":"v2.0.7","text":"

    Files

    • json.hpp (355 KB)
    • json.hpp.asc (1 KB)
    • Release date: 2016-11-02
    • SHA-256: 5545c323670f8165bae90b9dc6078825e86ec310d96cc4e5b47233ea43715bbf
    "},{"location":"home/releases/#summary_20","title":"Summary","text":"

    This release fixes a few bugs in the JSON parser found in the Parsing JSON is a Minefield \ud83d\udca3 article. The fixes are backwards compatible.

    "},{"location":"home/releases/#changes_6","title":"Changes","text":"
    • The article Parsing JSON is a Minefield \ud83d\udca3 discusses a lot of pitfalls of the JSON specification. When investigating the published test cases, a few bugs in the library were found and fixed:
    • Files with less than 5 bytes can now be parsed without error.
    • The library now properly rejects any file encoding other than UTF-8. Furthermore, incorrect surrogate pairs are properly detected and rejected.
    • The library now accepts all but one \"yes\" test (y_string_utf16.json): UTF-16 is not supported.
    • The library rejects all but one \"no\" test (n_number_then_00.json): Null bytes are treated as end of file instead of an error. This allows to parse input from null-terminated strings.
    • The string length passed to a user-defined string literal is now exploited to choose a more efficient constructor.
    • A few grammar mistakes in the README file have been fixed.
    "},{"location":"home/releases/#v206","title":"v2.0.6","text":"

    Files

    • json.hpp (349 KB)
    • json.hpp.asc (1 KB)
    • Release date: 2016-10-15
    • SHA256: 459cc93d5e2f503e50c6d5876eb86bfea7daf405f5a567c5a2c9abc2383756ae
    "},{"location":"home/releases/#summary_21","title":"Summary","text":"

    This release fixes the semantics of operator[] for JSON Pointers (see below). This fix is backwards compatible.

    "},{"location":"home/releases/#changes_7","title":"Changes","text":"
    • operator[] for JSON Pointers now behaves like the other versions of operator[] and transforms null values into objects or arrays if required. This allows to created nested structures like j[\"/foo/bar/2\"] = 17 (yielding {\"foo\": \"bar\": [null, null, 17]}) without problems.
    • overworked a helper SFINAE function
    • fixed some documentation issues
    • fixed the CMake files to allow to run the test suite outside the main project directory
    • restored test coverage to 100%.
    "},{"location":"home/releases/#v205","title":"v2.0.5","text":"

    Files

    • json.hpp (347 KB)
    • json.hpp.asc (1 KB)
    • Release date: 2016-09-14
    • SHA-256: 8b7565263a44e2b7d3b89808bc73d2d639037ff0c1f379e3d56dbd77e00b98d9
    "},{"location":"home/releases/#summary_22","title":"Summary","text":"

    This release fixes a regression bug in the stream parser (function parse() and the <</>> operators). This fix is backwards compatible.

    "},{"location":"home/releases/#changes_8","title":"Changes","text":"
    • Bug fix: The end of a file stream was not detected properly which led to parse errors. This bug should have been fixed with 2.0.4, but there was still a flaw in the code.
    "},{"location":"home/releases/#v204","title":"v2.0.4","text":"

    Files

    • json.hpp (347 KB)
    • json.hpp.asc (1 KB)
    • Release date: 2016-09-11
    • SHA-256: 632ceec4c25c4e2153f71470d3a2b992c8355f6d8b4d627d05dd16095cd3aeda
    "},{"location":"home/releases/#summary_23","title":"Summary","text":"

    This release fixes a bug in the stream parser (function parse() and the <</>> operators). This fix is backwards compatible.

    "},{"location":"home/releases/#changes_9","title":"Changes","text":"
    • Bug fix: The end of a file stream was not detected properly which led to parse errors.
    • Fixed a compiler warning about an unused variable.
    "},{"location":"home/releases/#v203","title":"v2.0.3","text":"

    Files

    • json.hpp (347 KB)
    • json.hpp.asc (1 KB)
    • Release date: 2016-08-31
    • SHA-256: 535b73efe5546fde9e763c14aeadfc7b58183c0b3cd43c29741025aba6cf6bd3
    "},{"location":"home/releases/#summary_24","title":"Summary","text":"

    This release combines a lot of small fixes and improvements. The release is backwards compatible.

    "},{"location":"home/releases/#changes_10","title":"Changes","text":"
    • The parser/deserialization functions have been generalized to process any contiguous sequence of 1-byte elements (e.g., char, unsigned char, uint8_t). This includes all kind of string representations (string literals, char arrays, std::string, const char*), contiguous containers (C-style arrays, std::vector, std::array, std::valarray, std::initializer_list). User-defined containers providing random-access iterator access via std::begin and std::end can be used as well. See the documentation (1, 2, 3, 4) for more information. Note that contiguous storage cannot be checked at compile time; if any of the parse functions are called with a noncompliant container, the behavior is undefined and will most likely yield segmentation violation. The preconditions are enforced by an assertion unless the library is compiled with preprocessor symbol NDEBUG.
    • As a general remark on assertions: The library uses assertions to preclude undefined behavior. A prominent example for this is the operator[] for const JSON objects. The behavior of this const version of the operator is undefined if the given key does not exist in the JSON object, because unlike the non-const version, it cannot add a null value at the given key. Assertions can be switched of by defining the preprocessor symbol NDEBUG. See the documentation of assert for more information.
    • In the course of cleaning up the parser/deserialization functions, the constructor basic_json(std::istream&, const parser_callback_t) has been deprecated and will be deleted with the next major release 3.0.0 to unify the interface of the library. Deserialization will be done by stream operators or by calling one of the parse functions. That is, calls like json j(i); for an input stream i need to be replaced by json j = json::parse(i);. Compilers will produce a deprecation warning if client code uses this function.
    • Minor improvements:
    • Improved the performance of the serialization by avoiding the re-creation of a locale object.
    • Fixed two MSVC warnings. Compiling the test suite with /Wall now only warns about non-inlined functions (C4710) and the deprecation of the constructor from input-stream (C4996).
    • Some project internals:
    • The project has qualified for the Core Infrastructure Initiative Best Practices Badge. While most requirements where already satisfied, some led to more explicit documentation of quality-ensuring procedures. For instance, static analysis is now executed with every commit on the build server. Furthermore, the contribution guidelines document how to communicate security issues privately.
    • The test suite has been overworked and split into several files to allow for faster compilation and analysis. The execute the test suite, simply execute make check.
    • The continuous integration with Travis was extended with Clang versions 3.6.0 to 3.8.1 and now includes 18 different compiler/OS combinations.
    • An 11-day run of American fuzzy lop checked 962 million inputs on the parser and found no issue.
    "},{"location":"home/releases/#v202","title":"v2.0.2","text":"

    Files

    • json.hpp (338 KB)
    • json.hpp.asc (1 KB)
    • Release date: 2016-07-31
    • SHA-256: 8e97b7965b4594b00998d6704465412360e1a0ed927badb51ded8b82291a8f3d
    "},{"location":"home/releases/#summary_25","title":"Summary","text":"

    This release combines a lot of small fixes and improvements. The release is backwards compatible.

    "},{"location":"home/releases/#changes_11","title":"Changes","text":"
    • The parser has been overworked, and a lot of small issues have been fixed:
    • Improved parser performance by avoiding recursion and using move semantics for the return value.
    • Unescaped control characters \\x10-\\x1f are not accepted any more.
    • Fixed a bug in the parser when reading from an input stream.
    • Improved test case coverage for UTF-8 parsing: now, all valid Unicode code points are tested both escaped and unescaped.
    • The precision of output streams is now preserved by the parser.
    • Started to check the code correctness by proving termination of important loops. Furthermore, individual assertions have been replaced by a more systematic function which checks the class invariants. Note that assertions should be switched off in production by defining the preprocessor macro NDEBUG, see the documentation of assert.
    • A lot of code cleanup: removed unused headers, fixed some compiler warnings, and fixed a build error for Windows-based Clang builds.
    • Added some compile-time checks:
    • Unsupported compilers are rejected during compilation with an #error command.
    • Static assertion prohibits code with incompatible pointer types used in get_ptr().
    • Improved the documentation, and adjusted the documentation script to choose the correct version of sed.
    • Replaced a lot of \"raw loops\" by STL functions like std::all_of, std::for_each, or std::accumulate. This facilitates reasoning about termination of loops and sometimes allowed to simplify functions to a single return statement.
    • Implemented a value() function for JSON pointers (similar to at function).
    • The Homebrew formula (see Integration) is now tested for all Xcode builds (6.1 - 8.x) with Travis.
    • Avoided output to std::cout in the test cases.
    "},{"location":"home/releases/#v201","title":"v2.0.1","text":"

    Files

    • json.hpp (321 KB)
    • json.hpp.asc (1 KB)
    • Release date: 2016-06-28
    • SHA-256: ef550fcd7df572555bf068e9ec4e9d3b9e4cdd441cecb0dcea9ea7fd313f72dd
    "},{"location":"home/releases/#summary_26","title":"Summary","text":"

    This release fixes a performance regression in the JSON serialization (function dump()). This fix is backwards compatible.

    "},{"location":"home/releases/#changes_12","title":"Changes","text":"
    • The locale of the output stream (or the internal string stream if a JSON value is serialized to a string) is now adjusted once for the whole serialization instead of for each floating-point number.
    • The locale of an output stream is now correctly reset to the previous value by the JSON library.
    "},{"location":"home/releases/#v200","title":"v2.0.0","text":"

    Files

    • json.hpp (321 KB)
    • json.hpp.asc (1 KB)
    • Release date: 2016-06-24
    • SHA-256: ac9e1fb25c2ac9ca5fc501fcd2fe3281fe04f07018a1b48820e7b1b11491bb6c
    "},{"location":"home/releases/#summary_27","title":"Summary","text":"

    This release adds several features such as JSON Pointers, JSON Patch, or support for 64 bit unsigned integers. Furthermore, several (subtle) bugs have been fixed.

    As noexcept and constexpr specifier have been added to several functions, the public API has effectively been changed in a (potential) non-backwards compatible manner. As we adhere to Semantic Versioning, this calls for a new major version, so say hello to 2\ufe0f\u20e3.0\ufe0f\u20e3.0\ufe0f\u20e3.

    "},{"location":"home/releases/#changes_13","title":"Changes","text":"
    • \ud83d\udd1f A JSON value now uses uint64_t (default value for template parameter NumberUnsignedType) as data type for unsigned integer values. This type is used automatically when an unsigned number is parsed. Furthermore, constructors, conversion operators and an is_number_unsigned() test have been added.
    • \ud83d\udc49 JSON Pointer (RFC 6901) support: A JSON Pointer is a string (similar to an XPath expression) to address a value inside a structured JSON value. JSON Pointers can be used in at() and operator[] functions. Furthermore, JSON values can be \u201cflattened\u201d to key/value pairs using flatten() where each key is a JSON Pointer. The original value can be restored by \u201cunflattening\u201d the flattened value using unflatten().
    • \ud83c\udfe5 JSON Patch (RFC 6902) support. A JSON Patch is a JSON value that describes the required edit operations (add, change, remove, \u2026) to transform a JSON value into another one. A JSON Patch can be created with function diff(const basic_json&) and applied with patch(const basic_json&). Note the created patches use a rather primitive algorithm so far and leave room for improvement.
    • \ud83c\uddea\ud83c\uddfa The code is now locale-independent: Floating-point numbers are always serialized with a period (.) as decimal separator and ignores different settings from the locale.
    • \ud83c\udf7a Homebrew support: Install the library with brew tap nlohmann/json && brew install nlohmann_json.
    • Added constructor to create a JSON value by parsing a std::istream (e.g., std::stringstream or std::ifstream).
    • Added noexcept specifier to basic_json(boolean_t), basic_json(const number_integer_t), basic_json(const int), basic_json(const number_float_t), iterator functions (begin(), end(), etc.)
    • When parsing numbers, the sign of 0.0 (vs. -0.0) is preserved.
    • Improved MSVC 2015, Android, and MinGW support. See README for more information.
    • Improved test coverage (added 2,225,386 tests).
    • Removed some misuses of std::move.
    • Fixed several compiler warnings.
    • Improved error messages from JSON parser.
    • Updated to re2c to version 0.16 to use a minimal DFAs for the lexer.
    • Updated test suite to use Catch version 1.5.6.
    • Made type getters (is_number, etc.) and const value access constexpr.
    • Functions push_back and operator+= now work with key/value pairs passed as initializer list, e.g. j_object += {\"key\", 1}.
    • Overworked CMakeLists.txt to make it easier to integrate the library into other projects.
    "},{"location":"home/releases/#notes","title":"Notes","text":"
    • Parser error messages are still very vague and contain no information on the error location.
    • The implemented diff function is rather primitive and does not create minimal diffs.
    • The name of function iteration_wrapper may change in the future and the function will be deprecated in the next release.
    • Roundtripping (i.e., parsing a JSON value from a string, serializing it, and comparing the strings) of floating-point numbers is not 100% accurate. Note that RFC 8259 defines no format to internally represent numbers and states not requirement for roundtripping. Nevertheless, benchmarks like Native JSON Benchmark treat roundtripping deviations as conformance errors.
    "},{"location":"home/releases/#v110","title":"v1.1.0","text":"

    Files

    • json.hpp (257 KB)
    • json.hpp.asc (1 KB)
    • Release date: 2016-01-24
    • SHA-256: c0cf0e3017798ca6bb18e757ebc570d21a3bdac877845e2b9e9573d183ed2f05
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    This release fixes several small bugs and adds functionality in a backwards-compatible manner. Compared to the last version (1.0.0), the following changes have been made:

    "},{"location":"home/releases/#changes_14","title":"Changes","text":"
    • Fixed: Floating-point numbers are now serialized and deserialized properly such that rountripping works in more cases. [#185, #186, #190, #191, #194]
    • Added: The code now contains assertions to detect undefined behavior during development. As the standard function assert is used, the assertions can be switched off by defining the preprocessor symbol NDEBUG during compilation. [#168]
    • Added: It is now possible to get a reference to the stored values via the newly added function get_ref(). [#128, #184]
    • Fixed: Access to object values via keys (operator[]) now works with all kind of string representations. [#171, #189]
    • Fixed: The code now compiles again with Microsoft Visual Studio 2015. [#144, #167, #188]
    • Fixed: All required headers are now included.
    • Fixed: Typos and other small issues. [#162, #166, #175, #177, #179, #180]
    "},{"location":"home/releases/#notes_1","title":"Notes","text":"

    There are still known open issues (#178, #187) which will be fixed in version 2.0.0. However, these fixes will require a small API change and will not be entirely backwards-compatible.

    "},{"location":"home/releases/#v100","title":"v1.0.0","text":"

    Files

    • json.hpp (243 KB)
    • json.hpp.asc (1 KB)
    • Release date: 2015-12-28
    • SHA-256: 767dc2fab1819d7b9e19b6e456d61e38d21ef7182606ecf01516e3f5230446de
    "},{"location":"home/releases/#summary_29","title":"Summary","text":"

    This is the first official release. Compared to the prerelease version 1.0.0-rc1, only a few minor improvements have been made:

    "},{"location":"home/releases/#changes_15","title":"Changes","text":"
    • Changed: A UTF-8 byte order mark is silently ignored.
    • Changed: sprintf is no longer used.
    • Changed: iterator_wrapper also works for const objects; note: the name may change!
    • Changed: Error messages during deserialization have been improved.
    • Added: The parse function now also works with type std::istream&&.
    • Added: Function value(key, default_value) returns either a copy of an object's element at the specified key or a given default value if no element with the key exists.
    • Added: Public functions are tagged with the version they were introduced. This shall allow for better versioning in the future.
    • Added: All public functions and types are documented (see http://nlohmann.github.io/json/doxygen/) including executable examples.
    • Added: Allocation of all types (in particular arrays, strings, and objects) is now exception-safe.
    • Added: They descriptions of thrown exceptions have been overworked and are part of the tests suite and documentation.
    "},{"location":"home/sponsors/","title":"Sponsors","text":"

    You can sponsor this library at GitHub Sponsors.

    "},{"location":"home/sponsors/#priority-sponsor","title":"Priority Sponsor","text":"
    • Martti Laine
    • Paul Harrington
    "},{"location":"home/sponsors/#named-sponsors","title":"Named Sponsors","text":"
    • Michael Hartmann
    • Stefan Hagen
    • Steve Sperandeo
    • Robert Jefe Lindst\u00e4dt
    • Steve Wagner
    • Lion Yang

    Thanks everyone!

    "},{"location":"integration/","title":"Header only","text":"

    json.hpp is the single required file in single_include/nlohmann or released here. You need to add

    #include <nlohmann/json.hpp>\n\n// for convenience\nusing json = nlohmann::json;\n

    to the files you want to process JSON and set the necessary switches to enable C++11 (e.g., -std=c++11 for GCC and Clang).

    You can further use file single_include/nlohmann/json_fwd.hpp for forward declarations.

    "},{"location":"integration/cmake/","title":"CMake","text":""},{"location":"integration/cmake/#integration","title":"Integration","text":"

    You can use the nlohmann_json::nlohmann_json interface target in CMake. This target populates the appropriate usage requirements for INTERFACE_INCLUDE_DIRECTORIES to point to the appropriate include directories and INTERFACE_COMPILE_FEATURES for the necessary C++11 flags.

    "},{"location":"integration/cmake/#external","title":"External","text":"

    To use this library from a CMake project, you can locate it directly with find_package() and use the namespaced imported target from the generated package configuration:

    Example

    CMakeLists.txt
    cmake_minimum_required(VERSION 3.5)\nproject(ExampleProject LANGUAGES CXX)\n\nfind_package(nlohmann_json 3.12.0 REQUIRED)\n\nadd_executable(example example.cpp)\ntarget_link_libraries(example PRIVATE nlohmann_json::nlohmann_json)\n

    The package configuration file, nlohmann_jsonConfig.cmake, can be used either from an install tree or directly out of the build tree.

    "},{"location":"integration/cmake/#embedded","title":"Embedded","text":"

    To embed the library directly into an existing CMake project, place the entire source tree in a subdirectory and call add_subdirectory() in your CMakeLists.txt file.

    Example

    CMakeLists.txt
    cmake_minimum_required(VERSION 3.5)\nproject(ExampleProject LANGUAGES CXX)\n\n# If you only include this third party in PRIVATE source files, you do not need to install it\n# when your main project gets installed.\nset(JSON_Install OFF CACHE INTERNAL \"\")\n\nadd_subdirectory(nlohmann_json)\n\nadd_executable(example example.cpp)\ntarget_link_libraries(example PRIVATE nlohmann_json::nlohmann_json)\n

    Note

    Do not use include(nlohmann_json/CMakeLists.txt), since that carries with it unintended consequences that will break the build. It is generally discouraged (although not necessarily well documented as such) to use include(...) for pulling in other CMake projects anyways.

    "},{"location":"integration/cmake/#supporting-both","title":"Supporting Both","text":"

    To allow your project to support either an externally supplied or an embedded JSON library, you can use a pattern akin to the following.

    Example

    CMakeLists.txt
    project(ExampleProject LANGUAGES CXX)\n\noption(EXAMPLE_USE_EXTERNAL_JSON \"Use an external JSON library\" OFF)\n\nadd_subdirectory(thirdparty)\n\nadd_executable(example example.cpp)\n\n# Note that the namespaced target will always be available regardless of the import method\ntarget_link_libraries(example PRIVATE nlohmann_json::nlohmann_json)\n
    thirdparty/CMakeLists.txt
    if(EXAMPLE_USE_EXTERNAL_JSON)\n    find_package(nlohmann_json 3.12.0 REQUIRED)\nelse()\n    set(JSON_BuildTests OFF CACHE INTERNAL \"\")\n    add_subdirectory(nlohmann_json)\nendif()\n

    thirdparty/nlohmann_json is then a complete copy of this source tree.

    "},{"location":"integration/cmake/#fetchcontent","title":"FetchContent","text":"

    Since CMake v3.11, FetchContent can be used to automatically download a release as a dependency at configure time.

    Example

    CMakeLists.txt
    cmake_minimum_required(VERSION 3.11)\nproject(ExampleProject LANGUAGES CXX)\n\ninclude(FetchContent)\n\nFetchContent_Declare(json URL https://github.com/nlohmann/json/releases/download/v3.12.0/json.tar.xz)\nFetchContent_MakeAvailable(json)\n\nadd_executable(example example.cpp)\ntarget_link_libraries(example PRIVATE nlohmann_json::nlohmann_json)\n

    Note

    It is recommended to use the URL approach described above which is supported as of version 3.10.0. It is also possible to pass the Git repository like

    FetchContent_Declare(json\n    GIT_REPOSITORY https://github.com/nlohmann/json\n    GIT_TAG v3.12.0\n)\n

    However, the repository https://github.com/nlohmann/json download size is quite large.

    "},{"location":"integration/cmake/#cmake-options","title":"CMake Options","text":""},{"location":"integration/cmake/#json_buildtests","title":"JSON_BuildTests","text":"

    Build the unit tests when BUILD_TESTING is enabled. This option is ON by default if the library's CMake project is the top project. That is, when integrating the library as described above, the test suite is not built unless explicitly switched on with this option.

    "},{"location":"integration/cmake/#json_ci","title":"JSON_CI","text":"

    Enable CI build targets. The exact targets are used during the several CI steps and are subject to change without notice. This option is OFF by default.

    "},{"location":"integration/cmake/#json_diagnostics","title":"JSON_Diagnostics","text":"

    Enable extended diagnostic messages by defining macro JSON_DIAGNOSTICS. This option is OFF by default.

    "},{"location":"integration/cmake/#json_diagnostic_positions","title":"JSON_Diagnostic_Positions","text":"

    Enable position diagnostics by defining macro JSON_DIAGNOSTIC_POSITIONS. This option is OFF by default.

    "},{"location":"integration/cmake/#json_disableenumserialization","title":"JSON_DisableEnumSerialization","text":"

    Disable default enum serialization by defining the macro JSON_DISABLE_ENUM_SERIALIZATION. This option is OFF by default.

    "},{"location":"integration/cmake/#json_fasttests","title":"JSON_FastTests","text":"

    Skip expensive/slow test suites. This option is OFF by default. Depends on JSON_BuildTests.

    "},{"location":"integration/cmake/#json_globaludls","title":"JSON_GlobalUDLs","text":"

    Place user-defined string literals in the global namespace by defining the macro JSON_USE_GLOBAL_UDLS. This option is OFF by default.

    "},{"location":"integration/cmake/#json_implicitconversions","title":"JSON_ImplicitConversions","text":"

    Enable implicit conversions by defining macro JSON_USE_IMPLICIT_CONVERSIONS. This option is ON by default.

    "},{"location":"integration/cmake/#json_install","title":"JSON_Install","text":"

    Install CMake targets during install step. This option is ON by default if the library's CMake project is the top project.

    "},{"location":"integration/cmake/#json_legacydiscardedvaluecomparison","title":"JSON_LegacyDiscardedValueComparison","text":"

    Enable the (incorrect) legacy comparison behavior of discarded JSON values by defining macro JSON_USE_LEGACY_DISCARDED_VALUE_COMPARISON. This option is OFF by default.

    "},{"location":"integration/cmake/#json_multipleheaders","title":"JSON_MultipleHeaders","text":"

    Use the non-amalgamated version of the library. This option is OFF by default.

    "},{"location":"integration/cmake/#json_systeminclude","title":"JSON_SystemInclude","text":"

    Treat the library headers like system headers (i.e., adding SYSTEM to the target_include_directories call) to check for this library by tools like Clang-Tidy. This option is OFF by default.

    "},{"location":"integration/cmake/#json_valgrind","title":"JSON_Valgrind","text":"

    Execute the test suite with Valgrind. This option is OFF by default. Depends on JSON_BuildTests.

    "},{"location":"integration/migration_guide/","title":"Migration Guide","text":"

    This page collects some guidelines on how to future-proof your code for future versions of this library.

    "},{"location":"integration/migration_guide/#replace-deprecated-functions","title":"Replace deprecated functions","text":"

    The following functions have been deprecated and will be removed in the next major version (i.e., 4.0.0). All deprecations are annotated with HEDLEY_DEPRECATED_FOR to report which function to use instead.

    "},{"location":"integration/migration_guide/#parsing","title":"Parsing","text":"

    • Function friend std::istream& operator<<(basic_json&, std::istream&) is deprecated since 3.0.0. Please use friend std::istream& operator>>(std::istream&, basic_json&) instead.

      DeprecatedFuture-proof 
      nlohmann::json j;\nstd::stringstream ss(\"[1,2,3]\");\nj << ss;\n
      nlohmann::json j;\nstd::stringstream ss(\"[1,2,3]\");\nss >> j;\n

    • Passing iterator pairs or pointer/length pairs to parsing functions (parse, accept, sax_parse, from_cbor, from_msgpack, from_ubjson, and from_bson via initializer lists is deprecated since 3.8.0. Instead, pass two iterators; for instance, call from_cbor(ptr, ptr+len) instead of from_cbor({ptr, len}).

      DeprecatedFuture-proof 
      const char* s = \"[1,2,3]\";\nbool ok = nlohmann::json::accept({s, s + std::strlen(s)});\n
      const char* s = \"[1,2,3]\";\nbool ok = nlohmann::json::accept(s, s + std::strlen(s));\n
    "},{"location":"integration/migration_guide/#json-pointers","title":"JSON Pointers","text":"

    • Comparing JSON Pointers with strings via operator== and operator!= is deprecated since 3.11.2. To compare a json_pointer p with a string s, convert s to a json_pointer first and use json_pointer::operator== or json_pointer::operator!=.

      DeprecatedFuture-proof 
      nlohmann::json::json_pointer lhs(\"/foo/bar/1\");\nassert(lhs == \"/foo/bar/1\");\n
      nlohmann::json::json_pointer lhs(\"/foo/bar/1\");\nassert(lhs == nlohmann::json::json_pointer(\"/foo/bar/1\"));\n

    • The implicit conversion from JSON Pointers to string (json_pointer::operator string_t) is deprecated since 3.11.0. Use json_pointer::to_string instead.

      DeprecatedFuture-proof 
      nlohmann::json::json_pointer ptr(\"/foo/bar/1\");\nstd::string s = ptr;\n
      nlohmann::json::json_pointer ptr(\"/foo/bar/1\");\nstd::string s = ptr.to_string();\n

    • Passing a basic_json specialization as template parameter RefStringType to json_pointer is deprecated since 3.11.0. The string type can now be directly provided.

      DeprecatedFuture-proof 
      using my_json = nlohmann::basic_json<std::map, std::vector, my_string_type>;\nnlohmann::json_pointer<my_json> ptr(\"/foo/bar/1\");\n
      nlohmann::json_pointer<my_string_type> ptr(\"/foo/bar/1\");\n

      Thereby, nlohmann::my_json::json_pointer is an alias for nlohmann::json_pointer<my_string_type> and is always an alias to the json_pointer with the appropriate string type for all specializations of basic_json.

    "},{"location":"integration/migration_guide/#miscellaneous-functions","title":"Miscellaneous functions","text":"

    • The function iterator_wrapper is deprecated since 3.1.0. Please use the member function items instead.

      DeprecatedFuture-proof 
      for (auto &x : nlohmann::json::iterator_wrapper(j))\n{\n    std::cout << x.key() << \":\" << x.value() << std::endl;\n}\n
      for (auto &x : j.items())\n{\n    std::cout << x.key() << \":\" << x.value() << std::endl;\n}\n

    • Function friend std::ostream& operator>>(const basic_json&, std::ostream&) is deprecated since 3.0.0. Please use friend operator<<(std::ostream&, const basic_json&) instead.

      DeprecatedFuture-proof 
      j >> std::cout;\n
      std::cout << j;\n

    • The legacy comparison behavior for discarded values is deprecated since 3.11.0. It is already disabled by default and can still be enabled by defining JSON_USE_LEGACY_DISCARDED_VALUE_COMPARISON to 1.

      DeprecatedFuture-proof 
      #define JSON_USE_LEGACY_DISCARDED_VALUE_COMPARISON 1\n#include <nlohmann/json.hpp>\n
      #include <nlohmann/json.hpp>\n
    "},{"location":"integration/migration_guide/#replace-implicit-conversions","title":"Replace implicit conversions","text":"

    Implicit conversions via operator ValueType will be switched off by default in the next major release of the library.

    You can prepare existing code by already defining JSON_USE_IMPLICIT_CONVERSIONS to 0 and replace any implicit conversions with calls to get, get_to, get_ref, or get_ptr.

    DeprecatedFuture-proofFuture-proof (alternative) 
    nlohmann::json j = \"Hello, world!\";\nstd::string s = j;\n
    nlohmann::json j = \"Hello, world!\";\nauto s = j.template get<std::string>();\n
    nlohmann::json j = \"Hello, world!\";\nstd::string s;\nj.get_to(s);\n

    You can prepare existing code by already defining JSON_USE_IMPLICIT_CONVERSIONS to 0 and replace any implicit conversions with calls to get.

    "},{"location":"integration/migration_guide/#import-namespace-literals-for-udls","title":"Import namespace literals for UDLs","text":"

    The user-defined string literals operator\"\"_json and operator\"\"_json_pointer will be removed from the global namespace in the next major release of the library.

    DeprecatedFuture-proof 
    nlohmann::json j = \"[1,2,3]\"_json;\n
    using namespace nlohmann::literals;\nnlohmann::json j = \"[1,2,3]\"_json;\n

    To prepare existing code, define JSON_USE_GLOBAL_UDLS to 0 and bring the string literals into scope where needed.

    "},{"location":"integration/migration_guide/#do-not-hard-code-the-complete-library-namespace","title":"Do not hard-code the complete library namespace","text":"

    The nlohmann namespace contains a sub-namespace to avoid problems when different versions or configurations of the library are used in the same project. Always use nlohmann as namespace or, when the exact version and configuration is relevant, use macro NLOHMANN_JSON_NAMESPACE to denote the namespace.

    DangerousFuture-proofFuture-proof (alternative) 
    void to_json(nlohmann::json_abi_v3_11_2::json& j, const person& p)\n{\n    j[\"age\"] = p.age;\n}\n
    void to_json(nlohmann::json& j, const person& p)\n{\n    j[\"age\"] = p.age;\n}\n
    void to_json(NLOHMANN_JSON_NAMESPACE::json& j, const person& p)\n{\n    j[\"age\"] = p.age;\n}\n
    "},{"location":"integration/migration_guide/#do-not-use-the-details-namespace","title":"Do not use the details namespace","text":"

    The details namespace is not part of the public API of the library and can change in any version without an announcement. Do not rely on any function or type in the details namespace.

    "},{"location":"integration/package_managers/","title":"Package Managers","text":"![Homebrew](../images/package_managers/homebrew.svg){: style=\"height:1em\"}\u00a0[**Homebrew**](#homebrew) `nlohmann-json` \u2003 ![Meson](../images/package_managers/meson.svg){: style=\"height:1em\"}\u00a0[**Meson**](#meson) `nlohmann_json` \u2003 ![Bazel](../images/package_managers/bazel.svg){: style=\"height:1em\"}\u00a0[**Bazel**](#bazel) `nlohmann_json` ![Conan](../images/package_managers/conan.svg){: style=\"height:1em\"}\u00a0[**Conan**](#conan) `nlohmann_json` \u2003 ![Spack](../images/package_managers/spack.svg){: style=\"height:1em\"}\u00a0[**Spack**](#spack) `nlohmann-json` \u2003 [**Hunter**](#hunter) `nlohmann_json` ![vcpkg](../images/package_managers/vcpkg.png){: style=\"height:1em\"}\u00a0[**vcpkg**](#vcpkg) `nlohmann-json` \u2003 [**cget**](#cget) `nlohmann/json` \u2003 ![Swift Package Manager](../images/package_managers/swift.svg){: style=\"height:1em\"}\u00a0[**Swift Package Manager**](#swift-package-manager) `nlohmann/json` ![Nuget](../images/package_managers/nuget.svg){: style=\"height:1em\"}\u00a0[**NuGet**](#nuget) `nlohmann.json` \u2003 ![Conda](../images/package_managers/conda.svg){: style=\"height:1em\"}\u00a0[**Conda**](#conda) `nlohmann_json` \u2003 ![MacPorts](../images/package_managers/macports.svg){: style=\"height:1em\"}\u00a0[**MacPorts**](#macports) `nlohmann-json` ![cpm.cmake](../images/package_managers/CPM.png){: style=\"height:1em\"}\u00a0[**CPM.cmake**](#cpmcmake) `gh:nlohmann/json` ![xmake](../images/package_managers/xmake.svg){: style=\"height:1em\"}\u00a0[**xmake**](#xmake) `nlohmann_json`"},{"location":"integration/package_managers/#running-example","title":"Running example","text":"

    Throughout this page, we will describe how to compile the example file example.cpp below.

    #include <nlohmann/json.hpp>\n#include <iostream>\n#include <iomanip>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    std::cout << std::setw(4) << json::meta() << std::endl;\n}\n

    When executed, this program should create output similar to

    {\n    \"compiler\": {\n        \"c++\": \"201103\",\n        \"family\": \"gcc\",\n        \"version\": \"12.4.0\"\n    },\n    \"copyright\": \"(C) 2013-2025 Niels Lohmann\",\n    \"name\": \"JSON for Modern C++\",\n    \"platform\": \"apple\",\n    \"url\": \"https://github.com/nlohmann/json\",\n    \"version\": {\n        \"major\": 3,\n        \"minor\": 12,\n        \"patch\": 0,\n        \"string\": \"3.12.0\"\n    }\n}\n
    "},{"location":"integration/package_managers/#homebrew","title":"Homebrew","text":"

    Summary

    formula: nlohmann-json

    • Availalbe versions: current version and development version (with --HEAD parameter)
    • The formula is updated with every release.
    • Maintainer: Niels Lohmann
    • File issues at the Homebrew issue tracker
    • Homebrew website

    If you are using Homebrew, you can install the library with

    brew install nlohmann-json\n

    The header can be used directly in your code or via CMake.

    Example: Raw compilation

    1. Create the following file:

      example.cpp
      #include <nlohmann/json.hpp>\n#include <iostream>\n#include <iomanip>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    std::cout << std::setw(4) << json::meta() << std::endl;\n}\n

    2. Install the package:

      brew install nlohmann-json\n

    3. Compile the code and pass the Homebrew prefix to the include path such that the library can be found:

      c++ example.cpp -I$(brew --prefix nlohmann-json)/include -std=c++11 -o example\n
    Example: CMake

    1. Create the following files:

      example.cpp
      #include <nlohmann/json.hpp>\n#include <iostream>\n#include <iomanip>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    std::cout << std::setw(4) << json::meta() << std::endl;\n}\n
      CMakeLists.txt
      cmake_minimum_required(VERSION 3.15)\nproject(json_example)\n\nfind_package(nlohmann_json CONFIG REQUIRED)\n\nadd_executable(json_example example.cpp)\ntarget_link_libraries(json_example PRIVATE nlohmann_json::nlohmann_json)\n

    2. Install the package:

      brew install nlohmann-json\n

    3. Compile the code and pass the Homebrew prefix to CMake to find installed packages via find_package:

      CMAKE_PREFIX_PATH=$(brew --prefix) cmake -S . -B build\ncmake --build build\n
    "},{"location":"integration/package_managers/#meson","title":"Meson","text":"

    Summary

    wrap: nlohmann_json

    • Availalbe versions: current version and select older versions (see WrapDB)
    • The package is update automatically from file meson.build.
    • File issues at the library issue tracker
    • Meson website

    If you are using the Meson Build System, add this source tree as a meson subproject. You may also use the include.zip published in this project's Releases to reduce the size of the vendored source tree. Alternatively, you can get a wrap file by downloading it from Meson WrapDB, or use

    meson wrap install nlohmann_json\n

    Please see the Meson project for any issues regarding the packaging.

    The provided meson.build can also be used as an alternative to CMake for installing nlohmann_json system-wide in which case a pkg-config file is installed. To use it, have your build system require the nlohmann_json pkg-config dependency. In Meson, it is preferred to use the dependency() object with a subproject fallback, rather than using the subproject directly.

    Example: Wrap

    1. Create the following files:

      meson.build
      project('json_example', 'cpp',\n  version: '1.0',\n  default_options: ['cpp_std=c++11']\n)\n\ndependency_json = dependency('nlohmann_json', required: true)\n\nexecutable('json_example',\n  sources: ['example.cpp'],\n  dependencies: [dependency_json],\n  install: true\n)\n
      example.cpp
      #include <nlohmann/json.hpp>\n#include <iostream>\n#include <iomanip>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    std::cout << std::setw(4) << json::meta() << std::endl;\n}\n

    2. Use the Meson WrapDB to fetch the nlohmann/json wrap:

      mkdir subprojects\nmeson wrap install nlohmann_json\n

    3. Build:

      meson setup build\nmeson compile -C build\n
    "},{"location":"integration/package_managers/#bazel","title":"Bazel","text":"

    Summary

    use bazel_dep, git_override, or local_path_override

    • Any version, that is available via Bazel Central Registry
    • File issues at the library issue tracker
    • Bazel website

    This repository provides a Bazel MODULE.bazel and a corresponding BUILD.bazel file. Therefore, this repository can be referenced within a MODULE.bazel by rules such as archive_override, git_override, or local_path_override. To use the library, you need to depend on the target @nlohmann_json//:json (i.e., via deps attribute).

    Example

    1. Create the following files:

      BUILD
      cc_binary(\n    name = \"main\",\n    srcs = [\"example.cpp\"],\n    deps = [\"@nlohmann_json//:json\"],\n)\n
      WORKSPACE
      bazel_dep(name = \"nlohmann_json\", version = \"3.11.3.bcr.1\")\n
      example.cpp
      #include <nlohmann/json.hpp>\n#include <iostream>\n#include <iomanip>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    std::cout << std::setw(4) << json::meta() << std::endl;\n}\n

    2. Build and run:

      bazel build //:main\nbazel run //:main\n
    "},{"location":"integration/package_managers/#conan","title":"Conan","text":"

    Summary

    recipe: nlohmann_json

    • Availalbe versions: current version and older versions (see Conan Center)
    • The package is update automatically via this recipe.
    • File issues at the Conan Center issue tracker
    • Conan website

    If you are using Conan to manage your dependencies, merely add nlohmann_json/x.y.z to your conanfile's requires, where x.y.z is the release version you want to use.

    Example

    1. Create the following files:

      Conanfile.txt
      [requires]\nnlohmann_json/3.12.0\n\n[generators]\nCMakeToolchain\nCMakeDeps\n
      CMakeLists.txt
      cmake_minimum_required(VERSION 3.15)\nproject(json_example)\n\nfind_package(nlohmann_json REQUIRED)\n\nadd_executable(json_example example.cpp)\ntarget_link_libraries(json_example PRIVATE nlohmann_json::nlohmann_json)\n
      example.cpp
      #include <nlohmann/json.hpp>\n#include <iostream>\n#include <iomanip>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    std::cout << std::setw(4) << json::meta() << std::endl;\n}\n

    2. Call Conan:

      conan install . --output-folder=build --build=missing\n

    3. Build:

      cmake -S . -B build -DCMAKE_TOOLCHAIN_FILE=\"conan_toolchain.cmake\" -DCMAKE_BUILD_TYPE=Release\ncmake --build build\n
    "},{"location":"integration/package_managers/#spack","title":"Spack","text":"

    Summary

    package: nlohmann-json

    • Availalbe versions: current version and older versions (see Spack package)
    • The package is updated with every release.
    • Maintainer: Axel Huebl
    • File issues at the Spack issue tracker
    • Spack website

    If you are using Spack to manage your dependencies, you can use the nlohmann-json package via

    spack install nlohmann-json\n

    Please see the Spack project for any issues regarding the packaging.

    Example

    1. Create the following files:

      CMakeLists.txt
      cmake_minimum_required(VERSION 3.15)\nproject(json_example)\n\nfind_package(nlohmann_json REQUIRED)\n\nadd_executable(json_example example.cpp)\ntarget_link_libraries(json_example PRIVATE nlohmann_json::nlohmann_json)\n
      example.cpp
      #include <nlohmann/json.hpp>\n#include <iostream>\n#include <iomanip>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    std::cout << std::setw(4) << json::meta() << std::endl;\n}\n

    2. Install the library:

      spack install nlohmann-json\n

    3. Load the environment for your Spack-installed packages:

      spack load nlohmann-json\n

    4. Build the project with CMake:

      cmake -S . -B build -DCMAKE_PREFIX_PATH=$(spack location -i nlohmann-json)\ncmake --build build\n
    "},{"location":"integration/package_managers/#hunter","title":"Hunter","text":"

    Summary

    package: nlohmann_json

    • Availalbe versions: current version and older versions (see Hunter package)
    • The package is updated with every release.
    • File issues at the Hunter issue tracker
    • Hunter website

    If you are using Hunter on your project for external dependencies, then you can use the nlohmann_json package via

    hunter_add_package(nlohmann_json)\n

    Please see the Hunter project for any issues regarding the packaging.

    Example

    1. Create the following files:

      CMakeLists.txt
      cmake_minimum_required(VERSION 3.15)\n\ninclude(\"cmake/HunterGate.cmake\")\nHunterGate(\n    URL \"https://github.com/cpp-pm/hunter/archive/v0.23.297.tar.gz\"\n    SHA1 \"3319fe6a3b08090df7df98dee75134d68e2ef5a3\"\n)\n\nproject(json_example)\n\nhunter_add_package(nlohmann_json)\nfind_package(nlohmann_json CONFIG REQUIRED)\n\nadd_executable(json_example example.cpp)\ntarget_link_libraries(json_example PRIVATE nlohmann_json::nlohmann_json)\n
      example.cpp
      #include <nlohmann/json.hpp>\n#include <iostream>\n#include <iomanip>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    std::cout << std::setw(4) << json::meta() << std::endl;\n}\n

    2. Download required files

      mkdir cmake\nwget https://raw.githubusercontent.com/cpp-pm/gate/master/cmake/HunterGate.cmake -O cmake/HunterGate.cmake\n

    3. Build the project with CMake:

      cmake -S . -B build\ncmake --build build\n
    "},{"location":"integration/package_managers/#vcpkg","title":"vcpkg","text":"

    Summary

    package: nlohmann-json

    • Availalbe versions: current version
    • The package is updated with every release.
    • File issues at the vcpkg issue tracker
    • vcpkg website

    If you are using vcpkg on your project for external dependencies, then you can install the nlohmann-json package with

    vcpkg install nlohmann-json\n

    and follow the then displayed descriptions. Please see the vcpkg project for any issues regarding the packaging.

    Example

    1. Create the following files:

      CMakeLists.txt
      cmake_minimum_required(VERSION 3.15)\nproject(json_example)\n\nfind_package(nlohmann_json CONFIG REQUIRED)\n\nadd_executable(json_example example.cpp)\ntarget_link_libraries(json_example PRIVATE nlohmann_json::nlohmann_json)\n
      example.cpp
      #include <nlohmann/json.hpp>\n#include <iostream>\n#include <iomanip>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    std::cout << std::setw(4) << json::meta() << std::endl;\n}\n

    2. Install package:

      vcpkg install nlohmann-json\n

    3. Build:

      cmake -S . -B build -DCMAKE_TOOLCHAIN_FILE=$VCPKG_ROOT/scripts/buildsystems/vcpkg.cmake\ncmake --build build\n
    "},{"location":"integration/package_managers/#cget","title":"cget","text":"

    Summary

    package: nlohmann/json

    • Availalbe versions: current version and older versions
    • The package is updated with every release.
    • File issues at the cget issue tracker
    • cget website

    If you are using cget, you can install the latest master version with

    cget install nlohmann/json\n

    A specific version can be installed with cget install nlohmann/json@v3.12.0. Also, the multiple header version can be installed by adding the -DJSON_MultipleHeaders=ON flag (i.e., cget install nlohmann/json -DJSON_MultipleHeaders=ON).

    Example

    1. Create the following files:

      CMakeLists.txt
      cmake_minimum_required(VERSION 3.15)\nproject(json_example)\n\nfind_package(nlohmann_json CONFIG REQUIRED)\n\nadd_executable(json_example example.cpp)\ntarget_link_libraries(json_example PRIVATE nlohmann_json::nlohmann_json)\n
      example.cpp
      #include <nlohmann/json.hpp>\n#include <iostream>\n#include <iomanip>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    std::cout << std::setw(4) << json::meta() << std::endl;\n}\n

    2. Initialize cget

      cget init\n

    3. Install the library

      cget install nlohmann/json\n

    4. Build

      cmake -S . -B build -DCMAKE_TOOLCHAIN_FILE=cget/cget/cget.cmake\ncmake --build build\n
    "},{"location":"integration/package_managers/#swift-package-manager","title":"Swift Package Manager","text":"

    Summary

    package: nlohmann/json

    • Availalbe versions: current version and older versions
    • The package is updated with every release.
    • File issues at the library issue tracker
    • Xcode documentation
    "},{"location":"integration/package_managers/#nuget","title":"NuGet","text":"

    Summary

    package: nlohmann.json

    • Availalbe versions: current and previous versions
    • The package is updated with every release.
    • Maintainer: Hani Kaabi
    • File issues at the maintainer's issue tracker
    • NuGet website

    If you are using NuGet, you can use the package nlohmann.json with

    dotnet add package nlohmann.json\n
    Example

    Probably the easiest way to use NuGet packages is through Visual Studio graphical interface. Just right-click on a project (any C++ project would do) in \u201cSolution Explorer\u201d and select \u201cManage NuGet Packages\u2026\u201d

    Now you can click on \u201cBrowse\u201d tab and find the package you like to install.

    Most of the packages in NuGet gallery are .NET packages and would not be useful in a C++ project. Microsoft recommends adding \u201cnative\u201d and \u201cnativepackage\u201d tags to C++ NuGet packages to distinguish them, but even adding \u201cnative\u201d to search query would still show many .NET-only packages in the list.

    Nevertheless, after finding the package you want, click on \u201cInstall\u201d button and accept confirmation dialogs. After the package is successfully added to the projects, you should be able to build and execute the project without the need for making any more changes to build settings.

    Note

    A few notes:

    • NuGet packages are installed per project and not system-wide. The header and binaries for the package are only available to the project it is added to, and not other projects (obviously unless we add the package to those projects as well)
    • One of the many great things about your elegant work is that it is a header-only library, which makes deployment very straightforward. In case of libraries which need binary deployment (.lib, .dll and .pdb for debug info) the different binaries for each supported compiler version must be added to the NuGet package. Some library creators cram binary versions for all supported Visual C++ compiler versions in the same package, so a single package will support all compilers. Some others create a different package for each compiler version (and you usually see things like \u201cv140\u201d or \u201cvc141\u201d in package name to clarify which VC++ compiler this package supports).
    • Packages can have dependency to other packages, and in this case, NuGet will install all dependencies as well as the requested package recursively.

    What happens behind the scenes

    After you add a NuGet package, three changes occur in the project source directory. Of course, we could make these changes manually instead of using GUI:

    1. A packages.config file will be created (or updated to include the package name if one such file already exists). This file contains a list of the packages required by this project (name and minimum version) and must be added to the project source code repository, so if you move the source code to a new machine, MSBuild/NuGet knows which packages it has to restore (which it does automatically before each build).

      <?xml version=\"1.0\" encoding=\"utf-8\"?>\n<packages>\n  <package id=\"nlohmann.json\" version=\"3.5.0\" targetFramework=\"native\" />\n</packages>\n

    2. A packages folder which contains actual files in the packages (these are header and binary files required for a successful build, plus a few metadata files). In case of this library for example, it contains json.hpp:

      Note

      This directory should not be added to the project source code repository, as it will be restored before each build by MSBuild/NuGet. If you go ahead and delete this folder, then build the project again, it will magically re-appear!

    3. Project MSBuild makefile (which for Visual C++ projects has a .vcxproj extension) will be updated to include settings from the package.

      The important bit for us here is line 170, which tells MSBuild to import settings from packages\\nlohmann.json.3.5.0\\build\\native\\nlohmann.json.targets file. This is a file the package creator created and added to the package (you can see it is one of the two files I created in this repository, the other just contains package attributes like name and version number). What does it contain?

      For our header-only repository, the only setting we need is to add our include directory to the list of AdditionalIncludeDirectories:

      <?xml version=\"1.0\" encoding=\"utf-8\"?>\n<Project ToolsVersion=\"4.0\" xmlns=\"http://schemas.microsoft.com/developer/msbuild/2003\">\n    <ItemDefinitionGroup>\n        <ClCompile>\n            <AdditionalIncludeDirectories>$(MSBuildThisFileDirectory)include;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>\n        </ClCompile>\n    </ItemDefinitionGroup>\n</Project>\n

      For libraries with binary files, we will need to add .lib files to linker inputs and add settings to copy .dll and other redistributable files to output directory, if needed.

      There are other changes to the makefile as well:

      • Lines 165-167 add the packages.config as one of project files (so it is shown in Solution Explorer tree view). It is added as None (no build action) and removing it wouldn\u2019t affect build.

      • Lines 172-177 check to ensure the required packages are present. This will display a build error if package directory is empty (for example when NuGet cannot restore packages because Internet connection is down). Again, if you omit this section, the only change in build would be a more cryptic error message if build fails.

      Note

      Changes to .vcxproj makefile should also be added to project source code repository.

    As you can see, the mechanism NuGet uses to modify project settings is through MSBuild makefiles, so using NuGet with other build systems and compilers (like CMake) as a dependency manager is either impossible or more problematic than useful.

    Please refer to this extensive description for more information.

    "},{"location":"integration/package_managers/#conda","title":"Conda","text":"

    Summary

    package: nlohmann_json

    • Availalbe versions: current and previous versions
    • The package is updated with every release.
    • File issues at the feedstock's issue tracker
    • Conda documentation

    If you are using conda, you can use the package nlohmann_json from conda-forge executing

    conda install -c conda-forge nlohmann_json\n
    Example

    1. Create the following file:

      example.cpp
      #include <nlohmann/json.hpp>\n#include <iostream>\n#include <iomanip>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    std::cout << std::setw(4) << json::meta() << std::endl;\n}\n

    2. Create and activate an anvironment \"json`:

      conda create -n json\nconda activate json\n

    3. Install the package:

      conda install -c conda-forge nlohmann_json\n

    4. Build the code:

      g++ -std=c++11 -I$(conda info --base)/envs/json/include example.cpp -o example\n
    "},{"location":"integration/package_managers/#msys2","title":"MSYS2","text":"

    If you are using MSYS2, you can use the mingw-w64-nlohmann-json package, type pacman -S mingw-w64-i686-nlohmann-json or pacman -S mingw-w64-x86_64-nlohmann-json for installation. Please file issues here if you experience problems with the packages.

    The package is updated automatically.

    "},{"location":"integration/package_managers/#macports","title":"MacPorts","text":"

    Summary

    port: nlohmann-json

    • Availalbe versions: current version
    • The port is updated with every release.
    • File issues at the MacPorts issue tracker
    • MacPorts website

    If you are using MacPorts, execute 

    sudo port install nlohmann-json\n

    to install the nlohmann-json package.

    Example: Raw compilation

    1. Create the following file:

      example.cpp
      #include <nlohmann/json.hpp>\n#include <iostream>\n#include <iomanip>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    std::cout << std::setw(4) << json::meta() << std::endl;\n}\n

    2. Install the package:

      sudo port install nlohmann-json\n

    3. Compile the code and pass the Homebrew prefix to the include path such that the library can be found:

      c++ example.cpp -I/opt/local/include -std=c++11 -o example\n
    Example: CMake

    1. Create the following files:

      example.cpp
      #include <nlohmann/json.hpp>\n#include <iostream>\n#include <iomanip>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    std::cout << std::setw(4) << json::meta() << std::endl;\n}\n
      CMakeLists.txt
      cmake_minimum_required(VERSION 3.15)\nproject(json_example)\n\nfind_package(nlohmann_json CONFIG REQUIRED)\n\nadd_executable(json_example example.cpp)\ntarget_link_libraries(json_example PRIVATE nlohmann_json::nlohmann_json)\n

    2. Install the package:

      sudo port install nlohmann-json\n

    3. Compile the code:

      cmake -S . -B build\ncmake --build build\n
    "},{"location":"integration/package_managers/#build2","title":"build2","text":"

    If you are using build2, you can use the nlohmann-json package from the public repository http://cppget.org or directly from the package's sources repository. In your project's manifest file, add depends: nlohmann-json (probably with some version constraints). If you are not familiar with using dependencies in build2, please read this introduction. Please file issues here if you experience problems with the packages.

    The package is updated automatically.

    bdep new -t exe -l c++\n
    "},{"location":"integration/package_managers/#cpmcmake","title":"CPM.cmake","text":"

    Summary

    package: gh:nlohmann/json

    • Availalbe versions: current and previous versions
    • The package is updated with every release.
    • File issues at the CPM.cmake issue tracker
    • CPM.cmake website

    If you are using CPM.cmake, add the CPM.cmake script and the following snippet to your CMake project:

    CPMAddPackage(\"gh:nlohmann/json@3.12.0\")\n
    Example

    1. Create the following files:

      example.cpp
      #include <nlohmann/json.hpp>\n#include <iostream>\n#include <iomanip>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    std::cout << std::setw(4) << json::meta() << std::endl;\n}\n
      CMakeLists.txt
      cmake_minimum_required(VERSION 3.15)\nproject(json_example)\n\ninclude(${CMAKE_SOURCE_DIR}/cmake/CPM.cmake)\n\nCPMAddPackage(\"gh:nlohmann/json@3.12.0\")\n\nadd_executable(json_example example.cpp)\ntarget_link_libraries(json_example PRIVATE nlohmann_json::nlohmann_json)\n

    2. Download CPM.cmake

      mkdir -p cmake\nwget -O cmake/CPM.cmake https://github.com/cpm-cmake/CPM.cmake/releases/latest/download/get_cpm.cmake\n

    3. Build

      cmake -S . -B build\ncmake --build build\n
    "},{"location":"integration/package_managers/#xmake","title":"xmake","text":"

    Summary

    package: nlohmann_json

    • Availalbe versions: current and previous versions
    • The package is updated with every release.
    • File issues at the xmake issue tracker
    • xmake website
    Example

    1. Create the following files:

      example.cpp
      #include <nlohmann/json.hpp>\n#include <iostream>\n#include <iomanip>\n\nusing json = nlohmann::json;\n\nint main()\n{\n    std::cout << std::setw(4) << json::meta() << std::endl;\n}\n
      xmake.lua
      add_requires(\"nlohmann_json\")\n\nadd_rules(\"mode.debug\", \"mode.release\")\ntarget(\"xm\")\n    set_kind(\"binary\")\n    add_files(\"example.cpp\")\n    add_packages(\"nlohmann_json\")\n    set_languages(\"cxx11\")\n

    2. Build

      xmake\n

    3. Run

      xmake run\n
    "},{"location":"integration/package_managers/#other-package-managers","title":"Other package managers","text":"

    The library is also contained in many other package repositories:

    Package version overview

    "},{"location":"integration/package_managers/#buckaroo","title":"Buckaroo","text":"

    If you are using Buckaroo, you can install this library's module with buckaroo add github.com/buckaroo-pm/nlohmann-json. There is a demo repo here.

    Warning

    The module is outdated as the respective repository has not been updated in years.

    "},{"location":"integration/package_managers/#cocoapods","title":"CocoaPods","text":"

    If you are using CocoaPods, you can use the library by adding pod \"nlohmann_json\", '~>3.1.2' to your podfile (see an example). Please file issues here.

    Warning

    The module is outdated as the respective pod has not been updated in years.

    "},{"location":"integration/pkg-config/","title":"Pkg-config","text":"

    If you are using bare Makefiles, you can use pkg-config to generate the include flags that point to where the library is installed:

    pkg-config nlohmann_json --cflags\n

    Users of the Meson build system will also be able to use a system-wide library, which will be found by pkg-config:

    json = dependency('nlohmann_json', required: true)\n
    "}]} \ No newline at end of file diff --git a/sitemap.xml b/sitemap.xml index 61c20b344..590e585c5 100644 --- a/sitemap.xml +++ b/sitemap.xml @@ -2,946 +2,950 @@ https://json.nlohmann.me/ - 2025-06-01 + 2025-06-29 https://json.nlohmann.me/api/json/ - 2025-06-01 + 2025-06-29 https://json.nlohmann.me/api/operator_gtgt/ - 2025-06-01 + 2025-06-29 https://json.nlohmann.me/api/operator_literal_json/ - 2025-06-01 + 2025-06-29 https://json.nlohmann.me/api/operator_literal_json_pointer/ - 2025-06-01 + 2025-06-29 https://json.nlohmann.me/api/operator_ltlt/ - 2025-06-01 + 2025-06-29 https://json.nlohmann.me/api/ordered_json/ - 2025-06-01 + 2025-06-29 https://json.nlohmann.me/api/ordered_map/ - 2025-06-01 + 2025-06-29 https://json.nlohmann.me/api/adl_serializer/ - 2025-06-01 + 2025-06-29 https://json.nlohmann.me/api/adl_serializer/from_json/ - 2025-06-01 + 2025-06-29 https://json.nlohmann.me/api/adl_serializer/to_json/ - 2025-06-01 + 2025-06-29 https://json.nlohmann.me/api/basic_json/ - 2025-06-01 + 2025-06-29 https://json.nlohmann.me/api/basic_json/accept/ - 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