countof.h

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#ifndef COUNTOF_H
#define COUNTOF_H
 
// todo replace with <stdcountof.h> when gcc16 is released
 
// internal, do not use this
#define _COUNTOF_IS_ARRAY(x) (!__builtin_types_compatible_p(typeof(x), typeof(&(x)[0])))
 
#define countof(array) \
    ({ \
        static_assert(_COUNTOF_IS_ARRAY(array), \
        "countof() argument must be an array"); \
        (sizeof(array) / sizeof((array)[0])); \
    }) \
 
#endif // COUNTOF_H