DEBUG macros in C++

Question

I just encountered a DEBUG macro in C that I really like

#ifdef DEBUG_BUILD
#  define DEBUG(x) fprintf(stderr, x)
#else
#  define DEBUG(x) do {} while (0)
#e         


        

Answer 1

This is the log macro I am using currently:

#ifndef DEBUG 
#define DEBUG 1 // set debug mode
#endif

#if DEBUG
#define log(...) {\
    char str[100];\
    sprintf(str, __VA_ARGS__);\
    std::cout << "[" << __FILE__ << "][" << __FUNCTION__ << "][Line " << __LINE__ << "] " << str << std::endl;\
    }
#else
#define log(...)
#endif

Usage:

log(">>> test...");

Output:

xxxx/proj.ios_mac/Classes/IntroScene.cpp][gotoNextScene][Line 58] >>> test...