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api/basic_json/binary_t/index.md
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@@ -28,6 +28,16 @@ The default representation of this binary format is a `std::vector<std::uint8_t>
`BinaryType` : container type to store arrays
```
Although not formally expressed as a C++ concept, `BinaryType` must be default-constructible,
copy/move-constructible, and support `push_back()`, `.data()`, and `.size()`, because
[`byte_container_with_subtype`](https://json.nlohmann.me/api/byte_container_with_subtype/index.md) derives directly from it. Its
`value_type` must additionally be exactly one byte wide (e.g., `std::uint8_t`/`char`/`std::byte`): the binary
serializers (CBOR, MessagePack, BSON, UBJSON) read and write the container's raw bytes via
`reinterpret_cast`, which is only correct for byte-sized elements -- a container like
`std::vector<std::intptr_t>` will not work as `BinaryType`.
```
## Notes
#### Default type