# JSON_HAS_THREE_WAY_COMPARISON

```
#define JSON_HAS_THREE_WAY_COMPARISON /* value */
```

This macro indicates whether the compiler and standard library support 3-way comparison. Possible values are `1` when supported or `0` when unsupported.

## Default definition

The default value is detected based on the preprocessor macros `__cpp_impl_three_way_comparison` and `__cpp_lib_three_way_comparison`.

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

## Examples

Example

The code below forces the library to use 3-way comparison:

```
#define JSON_HAS_THREE_WAY_COMPARISON 1
#include <nlohmann/json.hpp>

...
```

## Version history

- Added in version 3.11.0.