Question

Possible Duplicate:
#ifdef inside #define

How do I use the character “#” successfully inside a Macro? It screams when I do something like that:

#define DO(WHAT)        \
#ifdef DEBUG        \                           
  MyObj->WHAT()         \       
#endif              \

Answer 1

You can’t do that. You have to do something like this:

#ifdef DEBUG
#define DO(WHAT) MyObj->WHAT()
#else
#define DO(WHAT) do { } while(0)
#endif

The do { } while(0) avoids empty statements. See this question, for example.