macro_magic.h

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#ifndef XTF_MACRO_MAGIC_H
#define XTF_MACRO_MAGIC_H
 
#define _STR(x) #x
#define STR(x) _STR(x)
 
#define VA_NARGS_(_1, _2, _3, _4, _5, _6, _7, _8, _9, _10, _11, _12, N, ...) N
#define VA_NARGS(...) \
    VA_NARGS_(X,##__VA_ARGS__, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0)
 
#define VAR_MACRO_C1__(macro, c1, count, ...) macro##count(c1, ##__VA_ARGS__)
#define VAR_MACRO_C1_(macro, c1, count, ...)        \
    VAR_MACRO_C1__(macro, c1, count, ##__VA_ARGS__)
#define VAR_MACRO_C1(macro, c1, ...)                                \
    VAR_MACRO_C1_(macro, c1, VA_NARGS(__VA_ARGS__), ##__VA_ARGS__)
 
#define IS_DEFINED(x) _IS_DEFINED(x)
#define _IS_DEFINED_PARTIAL_1 0,
#define _IS_DEFINED(x) __IS_DEFINED(_IS_DEFINED_PARTIAL_ ## x)
#define __IS_DEFINED(y) ___IS_DEFINED(y 1, 0)
#define ___IS_DEFINED(maybe, val, ...) val
#endif /* XTF_MACRO_MAGIC_H */
 
/*
 * Local variables:
 * mode: C
 * c-file-style: "BSD"
 * c-basic-offset: 4
 * tab-width: 4
 * indent-tabs-mode: nil
 * End:
 */