(08-01-2014, 09:56 PM)benwaffle Wrote: __FUNC__ in the preprocessor expands to the function being called
__LINE__ expands to the line number of the

example:
#define ERROR fprintf(stderr, "error at line %d in function %d", __LINE__, __FUNC__)

Also can't forget __FILE__, __DATE__, __TIME__, etc. For more standard predefined macros you can check the standard. For all predefined macros in your environment (assuming you're using GCC or Clang) you can use -dM or for the end of preprocessor stage -dD.

Your ERROR has a mistake, you meant for the second specifier to be %s not %d :) Also should be noted __func__ is the actual standard one, it is the actual identifier itself (it's not a macro). Though some compilers wrap __FUNC__ around __func__ (they also often provide others like __FUNCTION__, __PRETTY_FUNCTION__).