29 lines
961 B
Markdown
29 lines
961 B
Markdown
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# JSON_HAS_CPP_11, JSON_HAS_CPP_14, JSON_HAS_CPP_17, JSON_HAS_CPP_20
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```cpp
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#define JSON_HAS_CPP_11
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#define JSON_HAS_CPP_14
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#define JSON_HAS_CPP_17
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#define JSON_HAS_CPP_20
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```
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The library targets C++11, but also supports some features introduced in later C++ versions (e.g., `std::string_view`
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support for C++17). For these new features, the library implements some preprocessor checks to determine the C++
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standard. By defining any of these symbols, the internal check is overridden and the provided C++ version is
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unconditionally assumed. This can be helpful for compilers that only implement parts of the standard and would be
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detected incorrectly.
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## Default definition
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The default value is detected based on preprocessor macros such as `#!cpp __cplusplus`, `#!cpp _HAS_CXX17`, or
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`#!cpp _MSVC_LANG`.
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## Notes
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- `#!cpp JSON_HAS_CPP_11` is always defined.
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- All macros are undefined outside the library.
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## Version history
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- Added in version 3.10.5.
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