Thread: Macro help

Originally Posted by laserlight

I can't say I've ever had reason to use the feature myself, but variadic macros were introduced in C99.

Thanks, the term variadic saved me there. It seems like they work with -std=gcc89? Is that ten years before C99? Well.

You are passing everything through a call to a function. You can make that function into a varargs function by declaring parameters with '...', and then call vfprintf instead of fprintf, passing the va_list parameter.

Thanks a lot. This time, for me, it is actually not necessary because 'fprintf' already accepts a variable number of arguments.

My result was

Code:

#define PRINT_ONCE(...) \

        do { \

            static bool fixme_written = 0;\

            if (!fixme_written) \

            {\

               fixme_written = 1; \

               fprintf(stderr, __VA_ARGS__); \

            } \
        } while (0)