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Documentation change (#3672)
Co-authored-by: Florian Albrechtskirchinger <falbrechtskirchinger@gmail.com>
This commit is contained in:
@@ -6,8 +6,8 @@ using boolean_t = BooleanType;
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The type used to store JSON booleans.
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[RFC 8259](https://tools.ietf.org/html/rfc8259) implicitly describes a boolean as a type which differentiates the two literals
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`#!json true` and `#!json false`.
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[RFC 8259](https://tools.ietf.org/html/rfc8259) implicitly describes a boolean as a type which differentiates the two
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literals `#!json true` and `#!json false`.
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To store objects in C++, a type is defined by the template parameter `BooleanType` which chooses the type to use.
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@@ -19,6 +19,23 @@ using json_serializer = JSONSerializer<T, SFINAE>;
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The default values for `json_serializer` is [`adl_serializer`](../adl_serializer).
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## Examples
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??? example
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The example below shows how a conversion of a non-default-constructible type is implemented via a specialization of
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the `adl_serializer`.
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```cpp
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--8<-- "examples/from_json__non_default_constructible.cpp"
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```
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Output:
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```json
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--8<-- "examples/from_json__non_default_constructible.output"
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```
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## Version history
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- Since version 2.0.0.
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@@ -28,4 +28,5 @@ and [`default_object_comparator_t`](default_object_comparator_t.md) otherwise.
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## Version history
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- Added in version 3.0.0.
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- Changed to be conditionally defined as `#!cpp typename object_t::key_compare` or `default_object_comparator_t` in version 3.11.0.
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- Changed to be conditionally defined as `#!cpp typename object_t::key_compare` or `default_object_comparator_t` in
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version 3.11.0.
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@@ -90,7 +90,8 @@ Objects are stored as pointers in a `basic_json` type. That is, for any access t
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The order name/value pairs are added to the object is *not* preserved by the library. Therefore, iterating an object may
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return name/value pairs in a different order than they were originally stored. In fact, keys will be traversed in
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alphabetical order as `std::map` with `std::less` is used by default. Please note this behavior conforms to
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[RFC 8259](https://tools.ietf.org/html/rfc8259), because any order implements the specified "unordered" nature of JSON objects.
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[RFC 8259](https://tools.ietf.org/html/rfc8259), because any order implements the specified "unordered" nature of JSON
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objects.
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## Examples
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@@ -21,7 +21,8 @@ const_reference operator[](const json_pointer& ptr) const;
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```
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1. Returns a reference to the array element at specified location `idx`.
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2. Returns a reference to the object element with specified key `key`. The non-const qualified overload takes the key by value.
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2. Returns a reference to the object element with specified key `key`. The non-const qualified overload takes the key by
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value.
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3. See 2. This overload is only available if `KeyType` is comparable with `#!cpp typename object_t::key_type` and
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`#!cpp typename object_comparator_t::is_transparent` denotes a type.
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4. Returns a reference to the element with specified JSON pointer `ptr`.
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@@ -234,6 +235,7 @@ Strong exception safety: if an exception occurs, the original value stays intact
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## Version history
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1. Added in version 1.0.0.
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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.
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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)
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in version 3.11.0.
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3. Added in version 3.11.0.
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4. Added in version 2.0.0.
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@@ -20,8 +20,8 @@ class basic_json {
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```
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1. Compares two JSON values for equality according to the following rules:
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- Two JSON values are equal if (1) neither value is discarded, or (2) they are of the same
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type and their stored values are the same according to their respective `operator==`.
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- Two JSON values are equal if (1) neither value is discarded, or (2) they are of the same type and their stored
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values are the same according to their respective `operator==`.
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- Integer and floating-point numbers are automatically converted before comparison.
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2. Compares a JSON value and a scalar or a scalar and a JSON value for equality by converting the
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@@ -11,15 +11,14 @@ template<typename ScalarType>
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bool operator>=(ScalarType lhs, const const_reference rhs) noexcept; // (2)
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```
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1. Compares whether one JSON value `lhs` is greater than or equal to another JSON value `rhs`
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according to the following rules:
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- The comparison always yields `#!cpp false` if (1) either operand is discarded, or (2) either
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operand is `NaN` and the other operand is either `NaN` or any other number.
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1. Compares whether one JSON value `lhs` is greater than or equal to another JSON value `rhs` according to the following
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rules:
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- The comparison always yields `#!cpp false` if (1) either operand is discarded, or (2) either operand is `NaN` and
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the other operand is either `NaN` or any other number.
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- Otherwise, returns the result of `#!cpp !(lhs < rhs)` (see [**operator<**](operator_lt.md)).
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2. Compares wether a JSON value is greater than or equal to a scalar or a scalar is greater than or
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equal to a JSON value by converting the scalar to a JSON value and comparing both JSON values
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according to 1.
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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
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value by converting the scalar to a JSON value and comparing both JSON values according to 1.
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## Template parameters
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@@ -20,13 +20,12 @@ class basic_json {
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```
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1. Compares two JSON values for inequality according to the following rules:
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- The comparison always yields `#!cpp false` if (1) either operand is discarded, or (2) either
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operand is `NaN` and the other operand is either `NaN` or any other number.
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- Otherwise, returns the result of `#!cpp !(lhs == rhs)` (until C++20) or
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`#!cpp !(*this == rhs)` (since C++20).
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- The comparison always yields `#!cpp false` if (1) either operand is discarded, or (2) either operand is `NaN` and
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the other operand is either `NaN` or any other number.
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- Otherwise, returns the result of `#!cpp !(lhs == rhs)` (until C++20) or `#!cpp !(*this == rhs)` (since C++20).
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2. Compares a JSON value and a scalar or a scalar and a JSON value for inequality by converting the
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scalar to a JSON value and comparing both JSON values according to 1.
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2. Compares a JSON value and a scalar or a scalar and a JSON value for inequality by converting the scalar to a JSON
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value and comparing both JSON values according to 1.
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## Template parameters
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@@ -12,16 +12,16 @@ class basic_json {
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1. 3-way compares two JSON values producing a result of type `std::partial_ordering` according to the following rules:
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- Two JSON values compare with a result of `std::partial_ordering::unordered` if either value is discarded.
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- If both JSON values are of the same type, the result is produced by 3-way comparing their stored values using their
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- If both JSON values are of the same type, the result is produced by 3-way comparing their stored values using
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their respective `operator<=>`.
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- Integer and floating-point numbers are converted to their common type and then 3-way compared using their
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respective `operator<=>`.
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- Integer and floating-point numbers are converted to their common type and then 3-way compared using their respective
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`operator<=>`.
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For instance, comparing an integer and a floating-point value will 3-way compare the first value convertered to
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For instance, comparing an integer and a floating-point value will 3-way compare the first value converted to
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floating-point with the second value.
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- Otherwise, yields a result by comparing the type (see [`value_t`](value_t.md)).
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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
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comparing both JSON values (see 1).
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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
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3-way comparing both JSON values (see 1).
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## Template parameters
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@@ -13,8 +13,8 @@ static void to_bjdata(const basic_json& j, detail::output_adapter<char> o,
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const bool use_size = false, const bool use_type = false);
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```
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Serializes a given JSON value `j` to a byte vector using the BJData (Binary JData) serialization format. BJData
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aims to be more compact than JSON itself, yet more efficient to parse.
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Serializes a given JSON value `j` to a byte vector using the BJData (Binary JData) serialization format. BJData aims to
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be more compact than JSON itself, yet more efficient to parse.
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1. Returns a byte vector containing the BJData serialization.
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2. Writes the BJData serialization to an output adapter.
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@@ -52,10 +52,8 @@ functions [`is_null`](is_null.md), [`is_object`](is_object.md), [`is_array`](is_
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`operator<` and `operator<=>` (since C++20) are overloaded and compare according to the ordering described above.
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Until C++20 all other relational and equality operators yield results according to the integer value of each
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enumerator.
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Since C++20 some compilers consider the _rewritten candidates_ generated from `operator<=>` during overload
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resolution, while others do not.
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For predictable and portable behavior use:
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enumerator. Since C++20 some compilers consider the _rewritten candidates_ generated from `operator<=>` during
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overload resolution, while others do not. For predictable and portable behavior use:
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- `operator<` or `operator<=>` when wanting to compare according to the order described above
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- `operator==` or `operator!=` when wanting to compare according to each enumerators integer value
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@@ -14,6 +14,8 @@ No-throw guarantee: this member function never throws exceptions.
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Linear.
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<!-- NOLINT Examples -->
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## Version history
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- Added in version 1.0.0.
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