Are there any good uses of macros? [closed]

Answer 1

Extending on the answer from @Matthieu, I've used macros to add file and line logging to a legacy codebase. So this:

void MovePlayer(Vector3 position)
{ 
    ...
}

became something like:

#define MovePlayer(pos) MovePlayer_(pos, __FILE__, __LINE__)

void MovePlayer_(Vector3 position, const char* file, int line)
{
    LogFunctionCall("MovePlayer", file, line);
    ...
}

By only changing one place in the codebase, I was able to log everywhere that the function got called during a complex test. If you do this to enough functions, it's very useful for tracing existing behaviour in old codebases.