Question

I have the following preprocessor divective:

#ifndef NDEBUG #define TRACE printf #else #define TRACE(...) #endif 

and example of usage is:

TRACE('TRACE: some parameter = %i\n', param); 

In C all works perfectly well when I build both debug and release versions, but in C++ compiler emits the following:

warning: invalid character in macro parameter name

error: badly punctuated parameter list in `#define’

and points these warning and error to the ‘TRACE(…)’ directive.

How to write this in C++ correctly?

Answer 1

You could do:

inline void TRACE(...) {}