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51 lines
1.6 KiB
Markdown
51 lines
1.6 KiB
Markdown
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# basic_json::binary
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```cpp
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// (1)
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static basic_json binary(const typename binary_t::container_type& init);
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static basic_json binary(typename binary_t::container_type&& init);
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// (2)
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static basic_json binary(const typename binary_t::container_type& init,
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std::uint8_t subtype);
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static basic_json binary(typename binary_t::container_type&& init,
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std::uint8_t subtype);
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```
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1. Creates a JSON binary array value from a given binary container.
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2. Creates a JSON binary array value from a given binary container with subtype.
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Binary values are part of various binary formats, such as CBOR, MessagePack, and BSON. This constructor is used to
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create a value for serialization to those formats.
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## Parameters
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`init` (in)
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: container containing bytes to use as binary type
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`subtype` (in)
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: subtype to use in CBOR, MessagePack, and BSON
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## Return value
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JSON binary array value
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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 `init`; constant for `typename binary_t::container_type&& init` versions.
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## Notes
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Note, this function exists because of the difficulty in correctly specifying the correct template overload in the
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standard value ctor, as both JSON arrays and JSON binary arrays are backed with some form of a `std::vector`. Because
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JSON binary arrays are a non-standard extension it was decided that it would be best to prevent automatic initialization
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of a binary array type, for backwards compatibility and so it does not happen on accident.
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## Version history
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- Added in version 3.8.0.
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