json/docs/mkdocs/docs/api/macros/nlohmann_json_namespace.md

NLOHMANN_JSON_NAMESPACE

#define NLOHMANN_JSON_NAMESPACE

This macro evaluates to the full name of the nlohmann namespace, including the name of a versioned and ABI-tagged inline namespace. Use this macro to unambiguously refer to the nlohmann namespace.

Default definition

The default value consists of a prefix, a version string, and optional ABI tags depending on whether ABI-affecting macros are defined (e.g., JSON_DIAGNOSTICS, and JSON_USE_LEGACY_DISCARDED_VALUE_COMPARISON).

When the macro is not defined, the library will define it to its default value.

Examples

??? example

The example shows how to use `NLOHMANN_JSON_NAMESPACE` instead of just `nlohmann`, as well as how to output the value
of `NLOHMANN_JSON_NAMESPACE`.

```cpp
--8<-- "examples/nlohmann_json_namespace.cpp"
```

Output:

```json
--8<-- "examples/nlohmann_json_namespace.output"
```

See also

• NLOHMANN_JSON_NAMESPACE_BEGIN, NLOHMANN_JSON_NAMESPACE_END

Version history

• Added in version 3.11.0.