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Merge remote-tracking branch 'origin/json-view/08-view-builder' into HEAD

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Signed-off-by: Niels Lohmann <mail@nlohmann.me>
This commit is contained in:
Niels Lohmann
2026-10-04 17:20:09 +02:00
parent ceb1cdb774 2739c0b0af
commit 3ba495ddf9
118 changed files with 10345 additions and 3274 deletions
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docs/mkdocs/docs/api/basic_json/as_base_class.md
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@@ -0,0 +1,53 @@
# <small>nlohmann::basic_json::</small>as_base_class
```cpp
json_base_class_t& as_base_class() noexcept;
const json_base_class_t& as_base_class() const noexcept;
```
Returns a reference to this object as its custom base class [`json_base_class_t`](json_base_class_t.md). No copy is
made.
Since `basic_json` derives from `json_base_class_t`, a member of `basic_json` hides any member of the custom base class
with the same name. This function makes such hidden members accessible again.
## Return value
reference to this object as [`json_base_class_t`](json_base_class_t.md)
## Exception safety
No-throw guarantee: this function never throws exceptions.
## Complexity
Constant.
## Notes
The function is equivalent to `static_cast<json_base_class_t&>(j)` (or `static_cast<const json_base_class_t&>(j)`).
## Examples
??? example
The example shows how to use `as_base_class` to access members of the custom base class that are hidden by members
of `basic_json`.
```cpp
--8<-- "examples/as_base_class.cpp"
```
Output:
```json
--8<-- "examples/as_base_class.output"
```
## See also
- [json_base_class_t](json_base_class_t.md) - type of the custom base class
## Version history
- Added in version 3.13.0.
docs/mkdocs/docs/api/basic_json/at.md
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@@ -238,5 +238,7 @@ Strong exception safety: if an exception occurs, the original value stays intact
1. Added in version 1.0.0.
2. Added in version 1.0.0.
3. Added in version 3.11.0.
3. Added in version 3.11.0. Fixed in version 3.13.0 to consistently accept `std::string_view`-convertible keys, as
already supported by [`operator[]`](operator[].md), [`value`](value.md), [`find`](find.md), and other lookup
functions.
4. Added in version 2.0.0.
docs/mkdocs/docs/api/basic_json/basic_json.md
+11 -1
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@@ -293,6 +293,15 @@ basic_json(basic_json&& other) noexcept;
When used without parentheses around an empty initializer list, `basic_json()` is called instead of this
function, yielding the JSON `#!json null` value.
- Overload 4:
!!! info "Implicit conversion"
The conversion is implicit unless [`JSON_USE_IMPLICIT_CONVERSIONS`](../macros/json_use_implicit_conversions.md)
is defined to `0` and `BasicJsonType::string_t` differs from `string_t`. In that case, the constructor is
`explicit`, so a JSON value with a different string type is no longer silently converted, for example when it is
passed to a function taking `#!cpp const json&`. Write `#!cpp json(other)` or `#!cpp other.get<json>()` instead.
- Overload 7:
!!! info "Preconditions"
@@ -466,7 +475,8 @@ basic_json(basic_json&& other) noexcept;
1. Since version 1.0.0.
2. Since version 1.0.0.
3. Since version 2.1.0.
4. Since version 3.2.0.
4. Since version 3.2.0. Explicit for different string types if `JSON_USE_IMPLICIT_CONVERSIONS` is `0` since
version 3.13.0.
5. Since version 1.0.0.
6. Since version 1.0.0.
7. Since version 1.0.0. Fixed in version 3.13.0 to also check the iterator range for binary values; before, a range
docs/mkdocs/docs/api/basic_json/contains.md
+3 -1
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@@ -131,7 +131,9 @@ Logarithmic in the size of the JSON object.
## 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.
2. Added in version 3.6.0. Extended template `KeyType` to support comparable types in version 3.11.0. Fixed in
version 3.13.0 to consistently accept `std::string_view`-convertible keys, as already supported by
[`operator[]`](operator[].md), [`at`](at.md), [`value`](value.md), and other lookup functions.
3. Added in version 3.7.0.
4. Deleted overloads for integral key types added in version 3.13.0 to reject such calls at compile time instead of
causing undefined behavior at runtime.
docs/mkdocs/docs/api/basic_json/count.md
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@@ -84,6 +84,8 @@ Logarithmic in the size of the JSON object.
## 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.
2. Added in version 1.0.0. Changed parameter `key` type to `KeyType&&` in version 3.11.0. Fixed in version 3.13.0 to
consistently accept `std::string_view`-convertible keys, as already supported by [`operator[]`](operator[].md),
[`at`](at.md), [`value`](value.md), and other lookup functions.
3. Deleted overload for integral key types added in version 3.13.0 to reject such calls at compile time instead of
causing undefined behavior at runtime.
docs/mkdocs/docs/api/basic_json/dump.md
+6 -3
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@@ -25,10 +25,12 @@ and `ensure_ascii` parameters.
result consists of ASCII characters only.
`error_handler` (in)
: how to react on decoding errors; there are three possible values (see [`error_handler_t`](error_handler_t.md):
: how to react on decoding errors; there are four possible values (see [`error_handler_t`](error_handler_t.md):
`strict` (throws an 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 valid bytes are copied to the
output unchanged, and invalid bytes are dropped)).
with U+FFFD), `ignore` (ignore invalid UTF-8 sequences during serialization; all valid bytes are copied to the
output unchanged, and invalid bytes are dropped), and `keep` (write the ill-formed bytes to the output as is,
without escaping them, even if `ensure_ascii` is `#!cpp true`; the result is then not valid UTF-8, but equals the
input bytes exactly, and well-formed characters around the ill-formed bytes are still escaped as usual)).
## Return value
@@ -94,3 +96,4 @@ Binary values are serialized as an object containing two keys:
- 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.
- Error handler `keep` added in version 3.13.0.
docs/mkdocs/docs/api/basic_json/emplace.md
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@@ -70,3 +70,5 @@ Logarithmic in the size of the container, O(log(`size()`)).
## Version history
- Since version 2.0.8.
- Fixed in version 3.13.0: for [`ordered_json`](../ordered_json.md), the value could previously only be passed as an
rvalue; it can now also be passed as an lvalue or a `#!cpp const` lvalue, matching the behavior of `json`.
docs/mkdocs/docs/api/basic_json/erase.md
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@@ -213,5 +213,7 @@ Strong exception safety: if an exception occurs, the original value stays intact
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.
4. Added in version 3.11.0. Fixed in version 3.13.0 to consistently accept `std::string_view`-convertible keys, as
already supported by [`operator[]`](operator[].md), [`at`](at.md), [`value`](value.md), and other lookup
functions.
5. Added in version 1.0.0.
docs/mkdocs/docs/api/basic_json/error_handler_t.md
+28 -4
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@@ -4,15 +4,31 @@
enum class error_handler_t {
strict,
replace,
ignore
ignore,
keep
};
```
This enumeration is used in the [`dump`](dump.md) function to choose how to treat decoding errors while serializing a
`basic_json` value. Three values are differentiated:
This enumeration is used to choose how to treat ill-formed UTF-8 in a string value or object key:
- [`dump`](dump.md) uses it while serializing a `basic_json` value to text.
- [`to_cbor`](to_cbor.md), [`to_msgpack`](to_msgpack.md), [`to_ubjson`](to_ubjson.md), [`to_bjdata`](to_bjdata.md),
and [`to_bson`](to_bson.md) use it while serializing a `basic_json` value to that binary format. Their default is
`keep`, as no binary writer checked before this parameter was added. CBOR, UBJSON, BJData, and BSON require valid
UTF-8, so for these four the default is `strict` if [`JSON_STRICT_BINARY_UTF8`](../macros/json_strict_binary_utf8.md)
is enabled; MessagePack's specification explicitly allows a string to contain ill-formed UTF-8, so `to_msgpack`
stays at `keep`. `to_bon8` does not take this parameter: BON8 always validates, since UTF-8 lead bytes are
structural to that format.
- [`from_cbor`](from_cbor.md), [`from_msgpack`](from_msgpack.md), [`from_ubjson`](from_ubjson.md),
[`from_bjdata`](from_bjdata.md), and [`from_bson`](from_bson.md) use it while parsing that binary format, to decide
whether to check a string value or object key for well-formed UTF-8 at all; by default (`keep`) they do not, as no
binary reader did before this parameter was added. `from_bon8` does not take this parameter, for the same reason
`to_bon8` does not.
Four values are differentiated:
strict
: throw a `type_error` exception in case of invalid UTF-8
: throw a `type_error`/`parse_error` exception in case of invalid UTF-8
replace
: replace invalid UTF-8 sequences with U+FFFD (� REPLACEMENT CHARACTER)
@@ -20,6 +36,12 @@ replace
ignore
: ignore invalid UTF-8 sequences; all valid bytes are copied to the output unchanged, and invalid bytes are dropped
keep
: keep invalid UTF-8 sequences unchanged; only meaningful for the binary formats mentioned above, since [`dump`]
(dump.md) itself must produce text, and `keep` there writes the ill-formed bytes to the output as is, so the
result is then not valid UTF-8 (but still equals the input bytes exactly, including around any well-formed
characters, which are still escaped as usual)
## Examples
??? example
@@ -45,3 +67,5 @@ ignore
## Version history
- Added in version 3.4.0.
- Added `keep`, and made this enumeration apply to the binary readers and writers in addition to `dump`, in version
3.13.0.
docs/mkdocs/docs/api/basic_json/find.md
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@@ -88,6 +88,8 @@ Logarithmic in the size of the JSON object.
## 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.
2. Added in version 1.0.0. Changed to support comparable types in version 3.11.0. Fixed in version 3.13.0 to
consistently accept `std::string_view`-convertible keys, as already supported by [`operator[]`](operator[].md),
[`at`](at.md), [`value`](value.md), and other lookup functions.
3. Deleted overloads for integral key types added in version 3.13.0 to reject such calls at compile time instead of
causing undefined behavior at runtime.
docs/mkdocs/docs/api/basic_json/from_bjdata.md
+12 -3
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@@ -5,12 +5,14 @@
template<typename InputType>
static basic_json from_bjdata(InputType&& i,
const bool strict = true,
const bool allow_exceptions = true);
const bool allow_exceptions = true,
const error_handler_t error_handler = error_handler_t::keep);
// (2)
template<typename IteratorType, typename SentinelType = IteratorType>
static basic_json from_bjdata(IteratorType first, SentinelType last,
const bool strict = true,
const bool allow_exceptions = true);
const bool allow_exceptions = true,
const error_handler_t error_handler = error_handler_t::keep);
```
Deserializes a given input to a JSON value using the BJData (Binary JData) serialization format.
@@ -58,6 +60,12 @@ The exact mapping and its limitations are described on a [dedicated page](../../
`allow_exceptions` (in)
: whether to throw exceptions in case of a parse error (optional, `#!cpp true` by default)
`error_handler` (in)
: how to treat a string value or object key that is not valid UTF-8; see [`error_handler_t`](error_handler_t.md).
BJData does not require a decoder to reject ill-formed UTF-8, so checking is opt-in: the default, `keep`, does not
check at all, as every binary reader did before this parameter was added; `strict` checks and throws;
`replace`/`ignore` sanitize the string the same way [`dump`](dump.md) would
## Return value
deserialized JSON value; in case of a parse error and `allow_exceptions` set to `#!cpp false`, the return value will be
@@ -73,7 +81,7 @@ Strong guarantee: if an exception is thrown, there are no changes in the JSON va
the end of the file was not reached when `strict` was set to true
- Throws [parse_error.112](../../home/exceptions.md#jsonexceptionparse_error112) if a parse error occurs
- Throws [parse_error.113](../../home/exceptions.md#jsonexceptionparse_error113) if a string could not be parsed
successfully
successfully, or if a string value or object key is not valid UTF-8 and `error_handler` is `strict`
- Throws [out_of_range.408](../../home/exceptions.md#jsonexceptionout_of_range408) if the size of an optimized container
or n-dimensional array cannot be represented by `std::size_t`
@@ -111,3 +119,4 @@ Linear in the size of the input.
- Added in version 3.11.0.
- Extended container support (1) to include types with lvalue-only ADL `begin`/`end` (matching `std::begin`/`std::end` semantics) in version 3.13.0.
- Extended overload (2) to accept heterogeneous iterator+sentinel pairs (C++20 ranges support) in version 3.13.0.
- Added `error_handler` parameter in version 3.13.0.
docs/mkdocs/docs/api/basic_json/from_bson.md
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@@ -5,12 +5,14 @@
template<typename InputType>
static basic_json from_bson(InputType&& i,
const bool strict = true,
const bool allow_exceptions = true);
const bool allow_exceptions = true,
const error_handler_t error_handler = error_handler_t::keep);
// (2)
template<typename IteratorType, typename SentinelType = IteratorType>
static basic_json from_bson(IteratorType first, SentinelType last,
const bool strict = true,
const bool allow_exceptions = true);
const bool allow_exceptions = true,
const error_handler_t error_handler = error_handler_t::keep);
```
Deserializes a given input to a JSON value using the BSON (Binary JSON) serialization format.
@@ -58,6 +60,12 @@ The exact mapping and its limitations are described on a [dedicated page](../../
`allow_exceptions` (in)
: whether to throw exceptions in case of a parse error (optional, `#!cpp true` by default)
`error_handler` (in)
: how to treat a string value or object key that is not valid UTF-8; see [`error_handler_t`](error_handler_t.md).
BSON does not require a decoder to reject ill-formed UTF-8, so checking is opt-in: the default, `keep`, does not
check at all, as every binary reader did before this parameter was added; `strict` checks and throws;
`replace`/`ignore` sanitize the string the same way [`dump`](dump.md) would
## Return value
deserialized JSON value; in case of a parse error and `allow_exceptions` set to `#!cpp false`, the return value will be
@@ -75,6 +83,8 @@ Strong guarantee: if an exception is thrown, there are no changes in the JSON va
invalid string or byte array length)
- Throws [`parse_error.114`](../../home/exceptions.md#jsonexceptionparse_error114) if an unsupported BSON record type is
encountered
- Throws [`parse_error.113`](../../home/exceptions.md#jsonexceptionparse_error113) if a string value or object key is
not valid UTF-8 and `error_handler` is `strict`
## Complexity
@@ -111,6 +121,7 @@ Linear in the size of the input.
- Added in version 3.4.0.
- Extended container support (1) to include types with lvalue-only ADL `begin`/`end` (matching `std::begin`/`std::end` semantics) in version 3.13.0.
- Extended overload (2) to accept heterogeneous iterator+sentinel pairs (C++20 ranges support) in version 3.13.0.
- Added `error_handler` parameter in version 3.13.0.
!!! warning "Deprecation"
docs/mkdocs/docs/api/basic_json/from_cbor.md
+14 -4
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@@ -6,14 +6,16 @@ template<typename InputType>
static basic_json from_cbor(InputType&& i,
const bool strict = true,
const bool allow_exceptions = true,
const cbor_tag_handler_t tag_handler = cbor_tag_handler_t::error);
const cbor_tag_handler_t tag_handler = cbor_tag_handler_t::error,
const error_handler_t error_handler = error_handler_t::keep);
// (2)
template<typename IteratorType, typename SentinelType = IteratorType>
static basic_json from_cbor(IteratorType first, SentinelType last,
const bool strict = true,
const bool allow_exceptions = true,
const cbor_tag_handler_t tag_handler = cbor_tag_handler_t::error);
const cbor_tag_handler_t tag_handler = cbor_tag_handler_t::error,
const error_handler_t error_handler = error_handler_t::keep);
```
Deserializes a given input to a JSON value using the CBOR (Concise Binary Object Representation) serialization format.
@@ -65,6 +67,12 @@ The exact mapping and its limitations are described on a [dedicated page](../../
: how to treat CBOR tags (optional, `error` by default); see [`cbor_tag_handler_t`](cbor_tag_handler_t.md) for more
information
`error_handler` (in)
: how to treat a string value or object key that is not valid UTF-8; see [`error_handler_t`](error_handler_t.md).
CBOR does not require a decoder to reject ill-formed UTF-8, so checking is opt-in: the default, `keep`, does not
check at all, as every binary reader did before this parameter was added; `strict` checks and throws;
`replace`/`ignore` sanitize the string the same way [`dump`](dump.md) would
## Return value
deserialized JSON value; in case of a parse error and `allow_exceptions` set to `#!cpp false`, the return value will be
@@ -80,8 +88,9 @@ Strong guarantee: if an exception is thrown, there are no changes in the JSON va
the end of the file was not reached when `strict` was set to true
- Throws [parse_error.112](../../home/exceptions.md#jsonexceptionparse_error112) if unsupported features from CBOR were
used in the given input or if the input is not valid CBOR
- Throws [parse_error.113](../../home/exceptions.md#jsonexceptionparse_error113) if a map key is not a string (keys of other
types are not supported, as JSON object keys are always strings) or a string is malformed
- Throws [parse_error.113](../../home/exceptions.md#jsonexceptionparse_error113) if a map key is not a string (keys of
other types are not supported, as JSON object keys are always strings), or if a string value or object key is not
valid UTF-8 and `error_handler` is `strict`
## Complexity
@@ -121,6 +130,7 @@ Linear in the size of the input.
- Added `tag_handler` parameter in version 3.9.0.
- Extended container support (1) to include types with lvalue-only ADL `begin`/`end` (matching `std::begin`/`std::end` semantics) in version 3.13.0.
- Extended overload (2) to accept heterogeneous iterator+sentinel pairs (C++20 ranges support) in version 3.13.0.
- Added `error_handler` parameter in version 3.13.0.
!!! warning "Deprecation"
docs/mkdocs/docs/api/basic_json/from_msgpack.md
+14 -4
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@@ -5,12 +5,14 @@
template<typename InputType>
static basic_json from_msgpack(InputType&& i,
const bool strict = true,
const bool allow_exceptions = true);
const bool allow_exceptions = true,
const error_handler_t error_handler = error_handler_t::keep);
// (2)
template<typename IteratorType, typename SentinelType = IteratorType>
static basic_json from_msgpack(IteratorType first, SentinelType last,
const bool strict = true,
const bool allow_exceptions = true);
const bool allow_exceptions = true,
const error_handler_t error_handler = error_handler_t::keep);
```
Deserializes a given input to a JSON value using the MessagePack serialization format.
@@ -58,6 +60,12 @@ The exact mapping and its limitations are described on a [dedicated page](../../
`allow_exceptions` (in)
: whether to throw exceptions in case of a parse error (optional, `#!cpp true` by default)
`error_handler` (in)
: how to treat a string value or object key that is not valid UTF-8; see [`error_handler_t`](error_handler_t.md).
MessagePack's specification explicitly allows ill-formed UTF-8, so checking is opt-in: the default, `keep`, does
not check at all, as every binary reader did before this parameter was added; `strict` checks and throws;
`replace`/`ignore` sanitize the string the same way [`dump`](dump.md) would
## Return value
deserialized JSON value; in case of a parse error and `allow_exceptions` set to `#!cpp false`, the return value will be
@@ -73,8 +81,9 @@ Strong guarantee: if an exception is thrown, there are no changes in the JSON va
the end of the file was not reached when `strict` was set to true
- Throws [parse_error.112](../../home/exceptions.md#jsonexceptionparse_error112) if unsupported features from
MessagePack were used in the given input or if the input is not valid MessagePack
- Throws [parse_error.113](../../home/exceptions.md#jsonexceptionparse_error113) if a map key is not a string (keys of other
types are not supported, as JSON object keys are always strings) or a string is malformed
- Throws [parse_error.113](../../home/exceptions.md#jsonexceptionparse_error113) if a map key is not a string (keys of
other types are not supported, as JSON object keys are always strings), or if a string value or object key is not
valid UTF-8 and `error_handler` is `strict`
## Complexity
@@ -113,6 +122,7 @@ Linear in the size of the input.
- Added `allow_exceptions` parameter in version 3.2.0.
- Extended container support (1) to include types with lvalue-only ADL `begin`/`end` (matching `std::begin`/`std::end` semantics) in version 3.13.0.
- Extended overload (2) to accept heterogeneous iterator+sentinel pairs (C++20 ranges support) in version 3.13.0.
- Added `error_handler` parameter in version 3.13.0.
!!! warning "Deprecation"
docs/mkdocs/docs/api/basic_json/from_ubjson.md
+12 -3
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@@ -5,12 +5,14 @@
template<typename InputType>
static basic_json from_ubjson(InputType&& i,
const bool strict = true,
const bool allow_exceptions = true);
const bool allow_exceptions = true,
const error_handler_t error_handler = error_handler_t::keep);
// (2)
template<typename IteratorType, typename SentinelType = IteratorType>
static basic_json from_ubjson(IteratorType first, SentinelType last,
const bool strict = true,
const bool allow_exceptions = true);
const bool allow_exceptions = true,
const error_handler_t error_handler = error_handler_t::keep);
```
Deserializes a given input to a JSON value using the UBJSON (Universal Binary JSON) serialization format.
@@ -58,6 +60,12 @@ The exact mapping and its limitations are described on a [dedicated page](../../
`allow_exceptions` (in)
: whether to throw exceptions in case of a parse error (optional, `#!cpp true` by default)
`error_handler` (in)
: how to treat a string value or object key that is not valid UTF-8; see [`error_handler_t`](error_handler_t.md).
UBJSON does not require a decoder to reject ill-formed UTF-8, so checking is opt-in: the default, `keep`, does not
check at all, as every binary reader did before this parameter was added; `strict` checks and throws;
`replace`/`ignore` sanitize the string the same way [`dump`](dump.md) would
## Return value
deserialized JSON value; in case of a parse error and `allow_exceptions` set to `#!cpp false`, the return value will be
@@ -73,7 +81,7 @@ Strong guarantee: if an exception is thrown, there are no changes in the JSON va
the end of the file was not reached when `strict` was set to true
- Throws [parse_error.112](../../home/exceptions.md#jsonexceptionparse_error112) if a parse error occurs
- Throws [parse_error.113](../../home/exceptions.md#jsonexceptionparse_error113) if a string could not be parsed
successfully
successfully, or if a string value or object key is not valid UTF-8 and `error_handler` is `strict`
- Throws [out_of_range.408](../../home/exceptions.md#jsonexceptionout_of_range408) if the size of an optimized container
or n-dimensional array cannot be represented by `std::size_t`
@@ -112,6 +120,7 @@ Linear in the size of the input.
- Added `allow_exceptions` parameter in version 3.2.0.
- Extended container support (1) to include types with lvalue-only ADL `begin`/`end` (matching `std::begin`/`std::end` semantics) in version 3.13.0.
- Extended overload (2) to accept heterogeneous iterator+sentinel pairs (C++20 ranges support) in version 3.13.0.
- Added `error_handler` parameter in version 3.13.0.
!!! warning "Deprecation"
docs/mkdocs/docs/api/basic_json/index.md
+1
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@@ -200,6 +200,7 @@ Direct access to the stored value of a JSON value.
- [**get_ref**](get_ref.md) - get a reference value
- [**operator ValueType**](operator_ValueType.md) - get a value
- [**get_binary**](get_binary.md) - get a binary value
- [**as_base_class**](as_base_class.md) - access the custom base class
### Element access
docs/mkdocs/docs/api/basic_json/json_base_class_t.md
+14
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@@ -27,6 +27,18 @@ A `CustomBaseClass` with non-static data members forfeits `basic_json`'s
[standard layout](https://en.cppreference.com/w/cpp/named_req/StandardLayoutType) guarantee. See
[Template Parameter Requirements](../../features/types/template_parameters.md#custombaseclass).
#### Name conflicts
Since `basic_json` derives from `CustomBaseClass`, members of `basic_json` hide members of `CustomBaseClass` with the
same name. Hidden members remain accessible via [`as_base_class`](as_base_class.md) or by casting the value to
`json_base_class_t`.
!!! warning "Avoid generic member names"
Future versions of the library may add members to `basic_json` that hide members of `CustomBaseClass` that are
accessible today. To reduce the risk of such conflicts, avoid generic names for the members of `CustomBaseClass`,
for instance by using a distinctive prefix.
## Examples
??? example
@@ -45,8 +57,10 @@ A `CustomBaseClass` with non-static data members forfeits `basic_json`'s
## See also
- [as_base_class](as_base_class.md) - access the custom base class
- [Template Parameter Requirements](../../features/types/template_parameters.md#custombaseclass) - the requirements for `CustomBaseClass`
## Version history
- Added in version 3.12.0.
- Made a public member type in version 3.13.0; it was private before, so it could not be named outside the class.
docs/mkdocs/docs/api/basic_json/meta.md
+1 -1
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@@ -13,7 +13,7 @@ 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). On HP aCC compilers, `compiler` is instead the plain string `hp`. |
| `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`, `hp`, `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`. |
docs/mkdocs/docs/api/basic_json/operator[].md
+11 -3
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@@ -89,6 +89,9 @@ Strong exception safety: if an exception occurs, the original value stays intact
- Throws [`out_of_range.410`](../../home/exceptions.md#jsonexceptionout_of_range410) if an array index in the passed
JSON pointer `ptr` exceeds the range of `size_type` (e.g., on 32-bit platforms).
For the **const** version, an object key or array index in `ptr` that does not exist is not reported by an
exception, but is undefined behavior (see the notes below). Use [`at`](at.md) for checked access.
## Complexity
1. Constant if `idx` is in the range of the array. Otherwise, linear in `idx - size()`.
@@ -103,9 +106,12 @@ Strong exception safety: if an exception occurs, the original value stays intact
The following cases apply to the **const** overloads; the non-const overloads instead insert the missing element
(see the notes below).
1. If the element at index `idx` does not exist, the behavior is undefined.
1. If the element at index `idx` does not exist, the behavior is undefined and is **guarded by a
[runtime assertion](../../features/assertions.md)**!
2. If the element with key `key` does not exist, the behavior is undefined and is **guarded by a
[runtime assertion](../../features/assertions.md)**!
3. If the JSON pointer `ptr` refers to an object key or an array index that does not exist, the behavior is
undefined and is **guarded by a [runtime assertion](../../features/assertions.md)**!
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 `#!json null` values to make `idx` a valid reference to the last stored element. In
@@ -273,9 +279,11 @@ Strong exception safety: if an exception occurs, the original value stays intact
## Version history
1. Added in version 1.0.0. Fixed in version 3.13.0 to throw `#!cpp std::length_error` instead of emptying the array and
accessing it out of bounds when `idx` equals the maximum value of `size_type`.
accessing it out of bounds when `idx` equals the maximum value of `size_type`. A missing index in the const version
is guarded by a runtime assertion since version 3.13.0.
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. Fixed in version 3.13.0 to consistently accept `std::string_view`-convertible keys, as
already supported by [`at`](at.md), [`value`](value.md), [`find`](find.md), and other lookup functions.
4. Added in version 2.0.0.
4. Added in version 2.0.0. A missing array index in the const version is guarded by a runtime assertion since
version 3.13.0.
docs/mkdocs/docs/api/basic_json/operator_eq.md
+10 -4
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@@ -5,17 +5,17 @@
bool operator==(const_reference lhs, const_reference rhs) noexcept; // (1)
template<typename ScalarType>
bool operator==(const_reference lhs, const ScalarType rhs) noexcept; // (2)
bool operator==(const_reference lhs, const ScalarType rhs) noexcept(/* see below */); // (2)
template<typename ScalarType>
bool operator==(ScalarType lhs, const const_reference rhs) noexcept; // (2)
bool operator==(ScalarType lhs, const const_reference rhs) noexcept(/* see below */); // (2)
// since C++20
class basic_json {
bool operator==(const_reference rhs) const noexcept; // (1)
template<typename ScalarType>
bool operator==(ScalarType rhs) const noexcept; // (2)
bool operator==(ScalarType rhs) const noexcept(/* see below */); // (2)
};
```
@@ -46,7 +46,12 @@ whether the values `lhs`/`*this` and `rhs` are equal
## Exception safety
No-throw guarantee: this function never throws exceptions.
1. No-throw guarantee: this function never throws exceptions.
2. No-throw guarantee if converting the scalar to a JSON value cannot throw, as for numbers, Booleans, and
`#!cpp nullptr`; the function is `#!cpp noexcept` exactly in that case. Otherwise, it throws what the conversion
throws, for example `std::bad_alloc` when converting a string, or
[`out_of_range.410`](../../home/exceptions.md#jsonexceptionout_of_range410) for an enum value not mapped by
[`NLOHMANN_JSON_SERIALIZE_ENUM_STRICT`](../macros/nlohmann_json_serialize_enum_strict.md).
## Complexity
@@ -171,3 +176,4 @@ Linear.
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.
Made conditionally `#!cpp noexcept` in version 3.13.0; before, a throwing conversion called `std::terminate`.
docs/mkdocs/docs/api/basic_json/operator_ge.md
+9 -3
View File
@@ -5,10 +5,10 @@
bool operator>=(const_reference lhs, const_reference rhs) noexcept; // (1)
template<typename ScalarType>
bool operator>=(const_reference lhs, const ScalarType rhs) noexcept; // (2)
bool operator>=(const_reference lhs, const ScalarType rhs) noexcept(/* see below */); // (2)
template<typename ScalarType>
bool operator>=(ScalarType lhs, const const_reference rhs) noexcept; // (2)
bool operator>=(ScalarType lhs, const const_reference rhs) noexcept(/* see below */); // (2)
```
1. Compares whether one JSON value `lhs` is greater than or equal to another JSON value `rhs` according to the following
@@ -39,7 +39,12 @@ whether `lhs` is greater than or equal to `rhs`
## Exception safety
No-throw guarantee: this function never throws exceptions.
1. No-throw guarantee: this function never throws exceptions.
2. No-throw guarantee if converting the scalar to a JSON value cannot throw, as for numbers, Booleans, and
`#!cpp nullptr`; the function is `#!cpp noexcept` exactly in that case. Otherwise, it throws what the conversion
throws, for example `std::bad_alloc` when converting a string, or
[`out_of_range.410`](../../home/exceptions.md#jsonexceptionout_of_range410) for an enum value not mapped by
[`NLOHMANN_JSON_SERIALIZE_ENUM_STRICT`](../macros/nlohmann_json_serialize_enum_strict.md).
## Complexity
@@ -94,3 +99,4 @@ Linear.
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.
Made conditionally `#!cpp noexcept` in version 3.13.0; before, a throwing conversion called `std::terminate`.
docs/mkdocs/docs/api/basic_json/operator_gt.md
+9 -3
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@@ -5,10 +5,10 @@
bool operator>(const_reference lhs, const_reference rhs) noexcept; // (1)
template<typename ScalarType>
bool operator>(const_reference lhs, const ScalarType rhs) noexcept; // (2)
bool operator>(const_reference lhs, const ScalarType rhs) noexcept(/* see below */); // (2)
template<typename ScalarType>
bool operator>(ScalarType lhs, const const_reference rhs) noexcept; // (2)
bool operator>(ScalarType lhs, const const_reference rhs) noexcept(/* see below */); // (2)
```
1. Compares whether one JSON value `lhs` is greater than another JSON value `rhs` according to the
@@ -39,7 +39,12 @@ whether `lhs` is greater than `rhs`
## Exception safety
No-throw guarantee: this function never throws exceptions.
1. No-throw guarantee: this function never throws exceptions.
2. No-throw guarantee if converting the scalar to a JSON value cannot throw, as for numbers, Booleans, and
`#!cpp nullptr`; the function is `#!cpp noexcept` exactly in that case. Otherwise, it throws what the conversion
throws, for example `std::bad_alloc` when converting a string, or
[`out_of_range.410`](../../home/exceptions.md#jsonexceptionout_of_range410) for an enum value not mapped by
[`NLOHMANN_JSON_SERIALIZE_ENUM_STRICT`](../macros/nlohmann_json_serialize_enum_strict.md).
## Complexity
@@ -84,3 +89,4 @@ Linear.
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.
Made conditionally `#!cpp noexcept` in version 3.13.0; before, a throwing conversion called `std::terminate`.
docs/mkdocs/docs/api/basic_json/operator_le.md
+9 -3
View File
@@ -5,10 +5,10 @@
bool operator<=(const_reference lhs, const_reference rhs) noexcept; // (1)
template<typename ScalarType>
bool operator<=(const_reference lhs, const ScalarType rhs) noexcept; // (2)
bool operator<=(const_reference lhs, const ScalarType rhs) noexcept(/* see below */); // (2)
template<typename ScalarType>
bool operator<=(ScalarType lhs, const const_reference rhs) noexcept; // (2)
bool operator<=(ScalarType lhs, const const_reference rhs) noexcept(/* see below */); // (2)
```
1. Compares whether one JSON value `lhs` is less than or equal to another JSON value `rhs`
@@ -40,7 +40,12 @@ whether `lhs` is less than or equal to `rhs`
## Exception safety
No-throw guarantee: this function never throws exceptions.
1. No-throw guarantee: this function never throws exceptions.
2. No-throw guarantee if converting the scalar to a JSON value cannot throw, as for numbers, Booleans, and
`#!cpp nullptr`; the function is `#!cpp noexcept` exactly in that case. Otherwise, it throws what the conversion
throws, for example `std::bad_alloc` when converting a string, or
[`out_of_range.410`](../../home/exceptions.md#jsonexceptionout_of_range410) for an enum value not mapped by
[`NLOHMANN_JSON_SERIALIZE_ENUM_STRICT`](../macros/nlohmann_json_serialize_enum_strict.md).
## Complexity
@@ -95,3 +100,4 @@ Linear.
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.
Made conditionally `#!cpp noexcept` in version 3.13.0; before, a throwing conversion called `std::terminate`.
docs/mkdocs/docs/api/basic_json/operator_lt.md
+9 -3
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@@ -5,10 +5,10 @@
bool operator<(const_reference lhs, const_reference rhs) noexcept; // (1)
template<typename ScalarType>
bool operator<(const_reference lhs, const ScalarType rhs) noexcept; // (2)
bool operator<(const_reference lhs, const ScalarType rhs) noexcept(/* see below */); // (2)
template<typename ScalarType>
bool operator<(ScalarType lhs, const const_reference rhs) noexcept; // (2)
bool operator<(ScalarType lhs, const const_reference rhs) noexcept(/* see below */); // (2)
```
1. Compares whether one JSON value `lhs` is less than another JSON value `rhs` according to the
@@ -49,7 +49,12 @@ whether `lhs` is less than `rhs`
## Exception safety
No-throw guarantee: this function never throws exceptions.
1. No-throw guarantee: this function never throws exceptions.
2. No-throw guarantee if converting the scalar to a JSON value cannot throw, as for numbers, Booleans, and
`#!cpp nullptr`; the function is `#!cpp noexcept` exactly in that case. Otherwise, it throws what the conversion
throws, for example `std::bad_alloc` when converting a string, or
[`out_of_range.410`](../../home/exceptions.md#jsonexceptionout_of_range410) for an enum value not mapped by
[`NLOHMANN_JSON_SERIALIZE_ENUM_STRICT`](../macros/nlohmann_json_serialize_enum_strict.md).
## Complexity
@@ -94,3 +99,4 @@ Linear.
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.
Made conditionally `#!cpp noexcept` in version 3.13.0; before, a throwing conversion called `std::terminate`.
docs/mkdocs/docs/api/basic_json/operator_ne.md
+9 -3
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@@ -5,10 +5,10 @@
bool operator!=(const_reference lhs, const_reference rhs) noexcept; // (1)
template<typename ScalarType>
bool operator!=(const_reference lhs, const ScalarType rhs) noexcept; // (2)
bool operator!=(const_reference lhs, const ScalarType rhs) noexcept(/* see below */); // (2)
template<typename ScalarType>
bool operator!=(ScalarType lhs, const const_reference rhs) noexcept; // (2)
bool operator!=(ScalarType lhs, const const_reference rhs) noexcept(/* see below */); // (2)
```
1. Compares two JSON values for inequality. Returns `#!cpp !(lhs == rhs)`.
@@ -36,7 +36,12 @@ whether the values `lhs`/`*this` and `rhs` are not equal
## Exception safety
No-throw guarantee: this function never throws exceptions.
1. No-throw guarantee: this function never throws exceptions.
2. No-throw guarantee if converting the scalar to a JSON value cannot throw, as for numbers, Booleans, and
`#!cpp nullptr`; the function is `#!cpp noexcept` exactly in that case. Otherwise, it throws what the conversion
throws, for example `std::bad_alloc` when converting a string, or
[`out_of_range.410`](../../home/exceptions.md#jsonexceptionout_of_range410) for an enum value not mapped by
[`NLOHMANN_JSON_SERIALIZE_ENUM_STRICT`](../macros/nlohmann_json_serialize_enum_strict.md).
## Complexity
@@ -98,3 +103,4 @@ Linear.
member function in version 3.13.0; since C++20, the compiler rewrites `a != b` using `operator==`.
2. Added in version 1.0.0. Changed in version 3.13.0 to remove special-casing for `NaN` and `discarded` values;
`operator!=` now consistently means `!(a == b)`. Since C++20, the compiler rewrites `a != b` using `operator==`.
Made conditionally `#!cpp noexcept` in version 3.13.0; before, a throwing conversion called `std::terminate`.
docs/mkdocs/docs/api/basic_json/operator_spaceship.md
+8 -2
View File
@@ -6,7 +6,7 @@ class basic_json {
std::partial_ordering operator<=>(const_reference rhs) const noexcept; // (1)
template<typename ScalarType>
std::partial_ordering operator<=>(const ScalarType rhs) const noexcept; // (2)
std::partial_ordering operator<=>(const ScalarType rhs) const noexcept(/* see below */); // (2)
};
```
@@ -39,7 +39,12 @@ the `std::partial_ordering` of the 3-way comparison of `*this` and `rhs`
## Exception safety
No-throw guarantee: this function never throws exceptions.
1. No-throw guarantee: this function never throws exceptions.
2. No-throw guarantee if converting the scalar to a JSON value cannot throw, as for numbers, Booleans, and
`#!cpp nullptr`; the function is `#!cpp noexcept` exactly in that case. Otherwise, it throws what the conversion
throws, for example `std::bad_alloc` when converting a string, or
[`out_of_range.410`](../../home/exceptions.md#jsonexceptionout_of_range410) for an enum value not mapped by
[`NLOHMANN_JSON_SERIALIZE_ENUM_STRICT`](../macros/nlohmann_json_serialize_enum_strict.md).
## Complexity
@@ -98,3 +103,4 @@ Linear.
1. Added in version 3.11.0.
2. Added in version 3.11.0.
Made conditionally `#!cpp noexcept` in version 3.13.0; before, a throwing conversion called `std::terminate`.
docs/mkdocs/docs/api/basic_json/to_bjdata.md
+19 -4
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@@ -5,15 +5,18 @@
static std::vector<std::uint8_t> to_bjdata(const basic_json& j,
const bool use_size = false,
const bool use_type = false,
const bjdata_version_t version = bjdata_version_t::draft2);
const bjdata_version_t version = bjdata_version_t::draft2,
const error_handler_t error_handler = error_handler_t::keep);
// (2)
static void to_bjdata(const basic_json& j, detail::output_adapter<std::uint8_t> o,
const bool use_size = false, const bool use_type = false,
const bjdata_version_t version = bjdata_version_t::draft2);
const bjdata_version_t version = bjdata_version_t::draft2,
const error_handler_t error_handler = error_handler_t::keep);
static void to_bjdata(const basic_json& j, detail::output_adapter<char> o,
const bool use_size = false, const bool use_type = false,
const bjdata_version_t version = bjdata_version_t::draft2);
const bjdata_version_t version = bjdata_version_t::draft2,
const error_handler_t error_handler = error_handler_t::keep);
```
Serializes a given JSON value `j` to a byte vector using the BJData (Binary JData) serialization format. BJData aims to
@@ -43,6 +46,12 @@ The exact mapping and its limitations are described on a [dedicated page](../../
: which version of BJData to use (see note on "Binary values" on [BJData](../../features/binary_formats/bjdata.md));
optional, `#!cpp bjdata_version_t::draft2` by default.
`error_handler` (in)
: how to treat a string or object key in `j` that is not valid UTF-8; see [`error_handler_t`](error_handler_t.md).
The default, `keep`, writes the ill-formed bytes to the output as is, as every version of `to_bjdata` did before
this parameter was added; `strict` throws; `replace`/`ignore` sanitize it the same way [`dump`](dump.md) would.
If [`JSON_STRICT_BINARY_UTF8`](../macros/json_strict_binary_utf8.md) is enabled, the default is `strict` instead.
## Return value
1. BJData serialization as byte vector
@@ -56,6 +65,9 @@ Strong guarantee: if an exception is thrown, there are no changes in the JSON va
- Throws [`other_error.502`](../../home/exceptions.md#jsonexceptionother_error502) if `use_type` is true and `use_size`
is false, and `j` contains a non-empty array, object, or binary value.
- Throws [type_error.316](../../home/exceptions.md#jsonexceptiontype_error316) if a string or object key in `j` is
not valid UTF-8 and `error_handler` is `strict` (the default only if
[`JSON_STRICT_BINARY_UTF8`](../macros/json_strict_binary_utf8.md) is enabled)
## Complexity
@@ -104,4 +116,7 @@ Linear in the size of the JSON value `j`.
## Version history
- Added in version 3.11.0.
- BJData version parameter (for draft3 binary encoding) added in version 3.12.0.
- BJData version parameter (for draft3 binary encoding) added in version 3.12.0.
- Added `error_handler` parameter in version 3.13.0. Its default, `keep`, writes the bytes of a string or object key
that is not valid UTF-8 unchanged, as before; `strict` (the default if
[`JSON_STRICT_BINARY_UTF8`](../macros/json_strict_binary_utf8.md) is enabled) throws `type_error.316`.
docs/mkdocs/docs/api/basic_json/to_bson.md
+19 -3
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@@ -2,11 +2,14 @@
```cpp
// (1)
static std::vector<std::uint8_t> to_bson(const basic_json& j);
static std::vector<std::uint8_t> to_bson(const basic_json& j,
const error_handler_t error_handler = error_handler_t::keep);
// (2)
static void to_bson(const basic_json& j, detail::output_adapter<std::uint8_t> o);
static void to_bson(const basic_json& j, detail::output_adapter<char> o);
static void to_bson(const basic_json& j, detail::output_adapter<std::uint8_t> o,
const error_handler_t error_handler = error_handler_t::keep);
static void to_bson(const basic_json& j, detail::output_adapter<char> o,
const error_handler_t error_handler = error_handler_t::keep);
```
BSON (Binary JSON) is a binary format in which zero or more ordered key/value pairs are stored as a single entity (a
@@ -25,6 +28,12 @@ The exact mapping and its limitations are described on a [dedicated page](../../
`o` (in)
: output adapter to write serialization to
`error_handler` (in)
: how to treat a string or object key in `j` that is not valid UTF-8; see [`error_handler_t`](error_handler_t.md).
The default, `keep`, writes the ill-formed bytes to the output as is, as every version of `to_bson` did before
this parameter was added; `strict` throws; `replace`/`ignore` sanitize it the same way [`dump`](dump.md) would.
If [`JSON_STRICT_BINARY_UTF8`](../macros/json_strict_binary_utf8.md) is enabled, the default is `strict` instead.
## Return value
1. BSON serialization as a byte vector
@@ -46,6 +55,9 @@ Strong guarantee: if an exception is thrown, there are no changes in the JSON va
- Throws [`out_of_range.415`](../../home/exceptions.md#jsonexceptionout_of_range415) if the subtype of a binary value
exceeds 255, the maximum of the BSON binary subtype; example:
`"subtype 70000 is too large for the BSON binary subtype (max 255)"`
- Throws [type_error.316](../../home/exceptions.md#jsonexceptiontype_error316) if a string or object key is
not valid UTF-8 and `error_handler` is `strict` (the default only if
[`JSON_STRICT_BINARY_UTF8`](../macros/json_strict_binary_utf8.md) is enabled)
## Complexity
@@ -98,3 +110,7 @@ pass before anything is written.
- Throws `out_of_range.412` and `out_of_range.415` since version 3.13.0.
- Linear in the size of `j`, and no longer limited by the call stack for deeply nested values, since version 3.13.0.
- `out_of_range.415` is now detected before anything is written, like the other exceptions above, since version 3.13.0.
- Added `error_handler` parameter in version 3.13.0. Its default, `keep`, writes the bytes of a string or object key
that is not valid UTF-8 unchanged, as before; `strict` (the default if
[`JSON_STRICT_BINARY_UTF8`](../macros/json_strict_binary_utf8.md) is enabled) throws `type_error.316` before anything
is written.
docs/mkdocs/docs/api/basic_json/to_cbor.md
+21 -3
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@@ -2,11 +2,14 @@
```cpp
// (1)
static std::vector<std::uint8_t> to_cbor(const basic_json& j);
static std::vector<std::uint8_t> to_cbor(const basic_json& j,
const error_handler_t error_handler = error_handler_t::keep);
// (2)
static void to_cbor(const basic_json& j, detail::output_adapter<std::uint8_t> o);
static void to_cbor(const basic_json& j, detail::output_adapter<char> o);
static void to_cbor(const basic_json& j, detail::output_adapter<std::uint8_t> o,
const error_handler_t error_handler = error_handler_t::keep);
static void to_cbor(const basic_json& j, detail::output_adapter<char> o,
const error_handler_t error_handler = error_handler_t::keep);
```
Serializes a given JSON value `j` to a byte vector using the CBOR (Concise Binary Object Representation) serialization
@@ -26,6 +29,12 @@ The exact mapping and its limitations are described on a [dedicated page](../../
`o` (in)
: output adapter to write serialization to
`error_handler` (in)
: how to treat a string or object key in `j` that is not valid UTF-8; see [`error_handler_t`](error_handler_t.md).
The default, `keep`, writes the ill-formed bytes to the output as is, as every version of `to_cbor` did before
this parameter was added; `strict` throws; `replace`/`ignore` sanitize it the same way [`dump`](dump.md) would.
If [`JSON_STRICT_BINARY_UTF8`](../macros/json_strict_binary_utf8.md) is enabled, the default is `strict` instead.
## Return value
1. CBOR serialization as a byte vector
@@ -35,6 +44,12 @@ The exact mapping and its limitations are described on a [dedicated page](../../
Strong guarantee: if an exception is thrown, there are no changes in the JSON value.
## Exceptions
- Throws [type_error.316](../../home/exceptions.md#jsonexceptiontype_error316) if a string or object key in `j` is
not valid UTF-8 and `error_handler` is `strict` (the default only if
[`JSON_STRICT_BINARY_UTF8`](../macros/json_strict_binary_utf8.md) is enabled)
## Complexity
Linear in the size of the JSON value `j`.
@@ -68,3 +83,6 @@ Linear in the size of the JSON value `j`.
- Added in version 2.0.9.
- Compact representation of floating-point numbers added in version 3.8.0.
- Added `error_handler` parameter in version 3.13.0. Its default, `keep`, writes the bytes of a string or object key
that is not valid UTF-8 unchanged, as before; `strict` (the default if
[`JSON_STRICT_BINARY_UTF8`](../macros/json_strict_binary_utf8.md) is enabled) throws `type_error.316`.
docs/mkdocs/docs/api/basic_json/to_msgpack.md
+17 -3
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@@ -2,11 +2,14 @@
```cpp
// (1)
static std::vector<std::uint8_t> to_msgpack(const basic_json& j);
static std::vector<std::uint8_t> to_msgpack(const basic_json& j,
const error_handler_t error_handler = error_handler_t::keep);
// (2)
static void to_msgpack(const basic_json& j, detail::output_adapter<std::uint8_t> o);
static void to_msgpack(const basic_json& j, detail::output_adapter<char> o);
static void to_msgpack(const basic_json& j, detail::output_adapter<std::uint8_t> o,
const error_handler_t error_handler = error_handler_t::keep);
static void to_msgpack(const basic_json& j, detail::output_adapter<char> o,
const error_handler_t error_handler = error_handler_t::keep);
```
Serializes a given JSON value `j` to a byte vector using the MessagePack serialization format. MessagePack is a binary
@@ -25,6 +28,13 @@ The exact mapping and its limitations are described on a [dedicated page](../../
`o` (in)
: output adapter to write serialization to
`error_handler` (in)
: how to treat a string or object key in `j` that is not valid UTF-8; see [`error_handler_t`](error_handler_t.md).
The default, `keep`, writes the ill-formed bytes to the output as is, as every version of `to_msgpack` did before
this parameter was added and as the MessagePack specification allows; `strict` throws; `replace`/`ignore` sanitize
it the same way [`dump`](dump.md) would. Unlike the other binary writers, the default stays `keep` even if
[`JSON_STRICT_BINARY_UTF8`](../macros/json_strict_binary_utf8.md) is enabled.
## Return value
1. MessagePack serialization as a byte vector
@@ -42,6 +52,8 @@ Strong guarantee: if an exception is thrown, there are no changes in the JSON va
- Throws [`out_of_range.415`](../../home/exceptions.md#jsonexceptionout_of_range415) if the subtype of a binary value
exceeds 255, the maximum of the MessagePack ext type; example:
`"subtype 70000 is too large for the MessagePack ext type (max 255)"`
- Throws [type_error.316](../../home/exceptions.md#jsonexceptiontype_error316) if a string or object key in `j` is
not valid UTF-8 and `error_handler` is `strict`
## Complexity
@@ -91,6 +103,8 @@ Linear in the size of the JSON value `j`.
- Added in version 2.0.9.
- Throws `out_of_range.412` and `out_of_range.415` since version 3.13.0.
- Added `error_handler` parameter in version 3.13.0. Its default, `keep`, writes the bytes of a string or object key
that is not valid UTF-8 unchanged, as before.
- Fixed in version 3.13.0 to serialize `number_integer_t`/`number_unsigned_t` pairs of different width correctly;
before, integers could be serialized with the wrong value if `number_integer_t` was narrower than
`number_unsigned_t`.
docs/mkdocs/docs/api/basic_json/to_ubjson.md
+18 -3
View File
@@ -4,13 +4,16 @@
// (1)
static std::vector<std::uint8_t> to_ubjson(const basic_json& j,
const bool use_size = false,
const bool use_type = false);
const bool use_type = false,
const error_handler_t error_handler = error_handler_t::keep);
// (2)
static void to_ubjson(const basic_json& j, detail::output_adapter<std::uint8_t> o,
const bool use_size = false, const bool use_type = false);
const bool use_size = false, const bool use_type = false,
const error_handler_t error_handler = error_handler_t::keep);
static void to_ubjson(const basic_json& j, detail::output_adapter<char> o,
const bool use_size = false, const bool use_type = false);
const bool use_size = false, const bool use_type = false,
const error_handler_t error_handler = error_handler_t::keep);
```
Serializes a given JSON value `j` to a byte vector using the UBJSON (Universal Binary JSON) serialization format. UBJSON
@@ -36,6 +39,12 @@ The exact mapping and its limitations are described on a [dedicated page](../../
: whether to add type annotations to container types (must be combined with `#!cpp use_size = true`); optional,
`#!cpp false` by default.
`error_handler` (in)
: how to treat a string or object key in `j` that is not valid UTF-8; see [`error_handler_t`](error_handler_t.md).
The default, `keep`, writes the ill-formed bytes to the output as is, as every version of `to_ubjson` did before
this parameter was added; `strict` throws; `replace`/`ignore` sanitize it the same way [`dump`](dump.md) would.
If [`JSON_STRICT_BINARY_UTF8`](../macros/json_strict_binary_utf8.md) is enabled, the default is `strict` instead.
## Return value
1. UBJSON serialization as a byte vector
@@ -49,6 +58,9 @@ Strong guarantee: if an exception is thrown, there are no changes in the JSON va
- Throws [`other_error.502`](../../home/exceptions.md#jsonexceptionother_error502) if `use_type` is true and `use_size`
is false, and `j` contains a non-empty array, object, or binary value.
- Throws [type_error.316](../../home/exceptions.md#jsonexceptiontype_error316) if a string or object key in `j` is
not valid UTF-8 and `error_handler` is `strict` (the default only if
[`JSON_STRICT_BINARY_UTF8`](../macros/json_strict_binary_utf8.md) is enabled)
## Complexity
@@ -97,3 +109,6 @@ Linear in the size of the JSON value `j`.
## Version history
- Added in version 3.1.0.
- Added `error_handler` parameter in version 3.13.0. Its default, `keep`, writes the bytes of a string or object key
that is not valid UTF-8 unchanged, as before; `strict` (the default if
[`JSON_STRICT_BINARY_UTF8`](../macros/json_strict_binary_utf8.md) is enabled) throws `type_error.316`.
docs/mkdocs/docs/api/basic_json/value.md
+3 -1
View File
@@ -222,7 +222,9 @@ changes to any JSON value.
1. Added in version 1.0.0. Changed parameter `default_value` type from `const ValueType&` to `ValueType&&` in version
3.11.0. Deleted overload for integral key types added in version 3.13.0 to reject such calls at compile time
instead of causing undefined behavior at runtime.
2. Added in version 3.11.0. Made `ValueType` the first template parameter in version 3.11.2.
2. Added in version 3.11.0. Made `ValueType` the first template parameter in version 3.11.2. Fixed in version 3.13.0
to consistently accept `std::string_view`-convertible keys, as already supported by
[`operator[]`](operator[].md), [`at`](at.md), [`find`](find.md), and other lookup functions.
3. Added in version 2.0.2. Extended to work with arrays in version 3.13.0, including fixing an issue where resolving
`ptr` through an array unexpectedly threw `out_of_range` instead of returning the resolved element (or
`default_value`, as documented).