C++ Macro to replace text with nothing -

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MacOS is often used for text replacement. In my case, I have to wipe certain keywords conditionally, so that The compilation is possible in those specific composers which are not specific features.

Especially I see where this snippet comes from 

  template & lt; Typename C & gt; Structure is_ size {template & lt; Typename T & gt; Static constexpr auto check (t *) - & gt; // Problem VS2013 typename std :: is_integral & lt; Decltype (std :: declval & lt; t const & gt; () size ()) & gt; :: type; // more stuff};

I am giving it as an example which was causing the question. In the above code, I 

  template & lt; Typename T & gt; Fixed #if COMPILE_WITH_GCC_NEW_ENOUGH constexpr #endif auto-check (T *) - & gt;

Because there were other parts where constexpr was to be replaced with the const so that it could be compiled.

What I am asking is a way to say like 

  define # constexpr ?????????

so that it will be replaced by constexpr in GCC coordinates and nothing from text in VS coordinators.

Definitely, just: 

  #define constexpr

nothing will expand to constexpr You can wrap this macro definition for your compiler inside the appropriate #if Does not support

Sometimes people make the "blank" detail more pronounced: 

  #define constexpr / * nothing * /
< / Div>

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