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nlohmann
33 lines
744 B
Markdown
33 lines
744 B
Markdown
# JSON_HAS_THREE_WAY_COMPARISON
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```cpp
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#define JSON_HAS_THREE_WAY_COMPARISON /* value */
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```
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This macro indicates whether the compiler and standard library support 3-way comparison.
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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 macros `#!cpp __cpp_impl_three_way_comparison`
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and `#!cpp __cpp_lib_three_way_comparison`.
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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 use 3-way comparison:
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```cpp
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#define JSON_HAS_THREE_WAY_COMPARISON 1
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#include <nlohmann/json.hpp>
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...
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```
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## Version history
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- Added in version 3.11.0.
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