C++ compiling on Windows and Linux: ifdef switch

Question

I want to run some c++ code on Linux and Windows. There are some pieces of code that I want to include only for one operating system and not the other. Is there a standard #ifdef that once can use?

Something like:

  #ifdef LINUX_KEY_WORD
    ... // linux code goes here.
  #elif WINDOWS_KEY_WORD
    ... // windows code goes here.
  #else 
  #error "OS not supported!"
  #endif

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The question is indeed a duplicate but the answers here are much better, especially the accepted one.

Answer 1

use:

#ifdef __linux__ 
    //linux code goes here
#elif _WIN32
    // windows code goes here
#else

#endif