39 lines
1.0 KiB
Markdown
39 lines
1.0 KiB
Markdown
# JSON_HAS_STATIC_RTTI
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```cpp
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#define JSON_HAS_STATIC_RTTI /* value */
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```
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This macro indicates whether the standard library has any support for RTTI (run time type information).
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Possible values are `1` when supported or `0` when unsupported.
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## Default definition
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The default value is detected based on the preprocessor macro `#!cpp _HAS_STATIC_RTTI`.
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When the macro is not defined, the library will define it to its default value.
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## Examples
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??? example
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The code below forces the library to enable support for libraries with RTTI dependence:
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```cpp
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#define JSON_HAS_STATIC_RTTI 1
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#include <nlohmann/json.hpp>
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...
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```
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## See also
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- [`operator ValueType`](../basic_json/operator_ValueType.md) - get a value (implicit); on C++17, this macro
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controls whether `std::any` is excluded from its candidate types
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- [Supported Macros](../../features/macros.md) - guide to all supported macros
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- [Converting values](../../features/conversions.md) - conversions of values
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## Version history
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- Added in version 3.11.3.
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