Hi Peter.

2016-10-17 3:44 GMT+09:00  <h...@zytor.com>:
>
> How is __is_defined() different from defined()?



defined() can be used only in pre-processor's #if context, like

    #if defined(FOO)
          ...
    #endif



__is_defined() can be used more flexibly.




-- 
Best Regards
Masahiro Yamada

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