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nlohmann
86 lines
2.8 KiB
Markdown
86 lines
2.8 KiB
Markdown
# <small>nlohmann::basic_json::</small>to_bjdata
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```cpp
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// (1)
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static std::vector<std::uint8_t> to_bjdata(const basic_json& j,
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const bool use_size = false,
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const bool use_type = false,
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const bjdata_version_t version = bjdata_version_t::draft2);
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// (2)
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static void to_bjdata(const basic_json& j, detail::output_adapter<std::uint8_t> o,
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const bool use_size = false, const bool use_type = false,
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const bjdata_version_t version = bjdata_version_t::draft2);
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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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const bjdata_version_t version = bjdata_version_t::draft2);
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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 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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The exact mapping and its limitations are described on a [dedicated page](../../features/binary_formats/bjdata.md).
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## Parameters
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`j` (in)
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: JSON value to serialize
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`o` (in)
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: output adapter to write serialization to
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`use_size` (in)
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: whether to add size annotations to container types; optional, `#!cpp false` by default.
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`use_type` (in)
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: whether to add type annotations to container types (must be combined with `#!cpp use_size = true`); optional,
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`#!cpp false` by default.
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`version` (in)
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: which version of BJData to use (see note on "Binary values" on [BJData](../../features/binary_formats/bjdata.md));
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optional, `#!cpp bjdata_version_t::draft2` by default.
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## Return value
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1. BJData serialization as byte vector
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2. (none)
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## Exception safety
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Strong guarantee: if an exception is thrown, there are no changes in the JSON value.
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## Complexity
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Linear in the size of the JSON value `j`.
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## Examples
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??? example
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The example shows the serialization of a JSON value to a byte vector in BJData format.
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```cpp
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--8<-- "examples/to_bjdata.cpp"
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```
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Output:
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```json
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--8<-- "examples/to_bjdata.output"
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```
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## See also
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- [from_bjdata](from_bjdata.md) create a JSON value from an input in BJData format
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- [to_cbor](to_cbor.md) create a CBOR serialization of a JSON value
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- [to_msgpack](to_msgpack.md) create a MessagePack serialization of a JSON value
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- [to_bson](to_bson.md) create a BSON serialization of a JSON value
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- [to_ubjson](to_ubjson.md) create a UBJSON serialization of a JSON value
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## Version history
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- Added in version 3.11.0.
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- BJData version parameter (for draft3 binary encoding) added in version 3.12.0. |