How to find the name of the current function at runtime?

Question

After years of using the big ugly MFC ASSERT macro, I have finally decided to ditch it and create the ultimate ASSERT macro.

I am fine with getting the file and line num

Answer 1

You can use the __FUNCTION__ macro which at compile time will be expanded to the name of the function.

Here's an example of how to use it in an assert macro.

#define ASSERT(cond) \
    do { if (!(cond)) \
    MessageBoxFunction("Failed: %s in Function %s", #cond, __FUNCTION__);\
    } while(0)

void MessageBoxFunction(const char* const msg,  ...)
{
    char szAssertMsg[2048];

    // format args
    va_list vargs;
    va_start(vargs, msg);
    vsprintf(szAssertMsg, msg, vargs);
    va_end(vargs);

    ::MessageBoxA(NULL, szAssertMsg, "Failed Assertion", MB_ICONERROR | MB_OK);
}