How do I check OS with a preprocessor directive?

Question

I need my code to do different things based on the operating system on which it gets compiled. I\'m looking for something like this:

#ifdef OSisWindows
// do         


        

Answer 1

#ifdef _WIN32
// do something for windows like include 
#elif defined __unix__
// do something for unix like include 
#elif defined __APPLE__
// do something for mac
#endif