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54 lines
1.2 KiB
Markdown
54 lines
1.2 KiB
Markdown
# JSON_SKIP_LIBRARY_VERSION_CHECK
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```cpp
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#define JSON_SKIP_LIBRARY_VERSION_CHECK
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```
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When defined, the library will not create a compiler warning when a different version of the library was already
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included.
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## Default definition
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By default, the macro is not defined.
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```cpp
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#undef JSON_SKIP_LIBRARY_VERSION_CHECK
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```
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## Notes
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!!! danger "ABI compatibility"
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Mixing different library versions in the same code can be a problem as the different versions may not be ABI
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compatible.
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## Examples
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??? example "Example: switch off the version check"
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The code below switches off the warning about including a different version of the library.
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```cpp
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#define JSON_SKIP_LIBRARY_VERSION_CHECK 1
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#include <nlohmann/json.hpp>
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...
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```
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??? example "Example: warning about a different library version"
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The following warning will be shown in case a different version of the library was already included:
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```
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Already included a different version of the library!
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```
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## See also
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- [NLOHMANN_JSON_VERSION_MAJOR, NLOHMANN_JSON_VERSION_MINOR,
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NLOHMANN_JSON_VERSION_PATCH](nlohmann_json_version_major.md) - library version information
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## Version history
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- Added in version 3.11.0.
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