How do you create a debug only function that takes a variable argument list? Like printf()

Question

I\'d like to make a debug logging function with the same parameters as printf. But one that can be removed by the pre-processor during optimized builds.

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Answer 1

Having come across the problem today, my solution is the following macro:

    static TCHAR __DEBUG_BUF[1024];
    #define DLog(fmt, ...)  swprintf(__DEBUG_BUF, fmt, ##__VA_ARGS__); OutputDebugString(__DEBUG_BUF) 
  

You can then call the function like this:

    int value = 42;
    DLog(L"The answer is: %d\n", value);