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In header files I’ve seen two main ways for defining macro to avoid including the file more than once.
1.
#ifndef SOME_CLASS
#define SOME_CLASS
//code ...
#endif
2.
#ifndef SOME_CLASS
//code...
#define SOME_CLASS
#endif
Which is more preferable and why?
I prefer the first method, because it doesn’t matter what happens after the ifndef because it will be defined straight after.