Thread: macro directive question

For the following directive snippet, would the contents of the if directive executive only when DBG is equal to a non-zero value?

Code:

#if DBG
#define SHOULD(b)       { if (!(b)) DEBUGMESSAGE( ("FAILURE CONDITION ENCOUNTERED") ); }
#else
#define SHOULD(b)       /* empty value */
#endif

You could always try it and find out, but yes, that's how it works.

what you are looking for is assert() in <cassert>.

Originally Posted by cyberfish

what you are looking for is assert() in <cassert>.

Although assert() only works in Debug mode (i.e. if NDEBUG isn't defined); so if that's what you want, go with assert(), otherwise creating your own is fine.
assert() also ends the program, which might not always be what you want.