mirror of
https://github.com/nlohmann/json.git
synced 2026-07-09 03:55:09 +00:00
nlohmann
68 lines
1.8 KiB
Markdown
68 lines
1.8 KiB
Markdown
# <small>nlohmann::basic_json::</small>to_msgpack
|
|
|
|
```cpp
|
|
// (1)
|
|
static std::vector<std::uint8_t> to_msgpack(const basic_json& j);
|
|
|
|
// (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);
|
|
```
|
|
|
|
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](../../features/binary_formats/messagepack.md).
|
|
|
|
## Parameters
|
|
|
|
`j` (in)
|
|
: JSON value to serialize
|
|
|
|
`o` (in)
|
|
: output adapter to write serialization to
|
|
|
|
## Return value
|
|
|
|
1. MessagePack serialization as a byte vector
|
|
2. (none)
|
|
|
|
## Exception safety
|
|
|
|
Strong guarantee: if an exception is thrown, there are no changes in the JSON value.
|
|
|
|
## Complexity
|
|
|
|
Linear in the size of the JSON value `j`.
|
|
|
|
## Examples
|
|
|
|
??? example
|
|
|
|
The example shows the serialization of a JSON value to a byte vector in MessagePack format.
|
|
|
|
```cpp
|
|
--8<-- "examples/to_msgpack.cpp"
|
|
```
|
|
|
|
Output:
|
|
|
|
```json
|
|
--8<-- "examples/to_msgpack.output"
|
|
```
|
|
|
|
## See also
|
|
|
|
- [from_msgpack](from_msgpack.md) create a JSON value from an input in MessagePack format
|
|
- [to_cbor](to_cbor.md) create a CBOR serialization of a JSON value
|
|
- [to_bson](to_bson.md) create a BSON serialization of a JSON value
|
|
- [to_ubjson](to_ubjson.md) create a UBJSON serialization of a JSON value
|
|
- [to_bjdata](to_bjdata.md) create a BJData serialization of a JSON value
|
|
|
|
## Version history
|
|
|
|
- Added in version 2.0.9.
|