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json/api/macros/json_has_static_rtti.md
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2026-07-08 18:19:46 +00:00

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# JSON_HAS_STATIC_RTTI
```cpp
#define JSON_HAS_STATIC_RTTI /* value */
```
This macro indicates whether the standard library has any support for RTTI (run time type information).
Possible values are `1` when supported or `0` when unsupported.
## Default definition
The default value is detected based on the preprocessor macro `#!cpp _HAS_STATIC_RTTI`.
When the macro is not defined, the library will define it to its default value.
## Examples
??? example
The code below forces the library to enable support for libraries with RTTI dependence:
```cpp
#define JSON_HAS_STATIC_RTTI 1
#include <nlohmann/json.hpp>
...
```
## Version history
- Added in version 3.11.3.