Yeah the usual way in C would be to use statement expression (which is a GCC extension but is supported by at least clang and msvc) #define all_bits_set(va

Yeah the usual way in C would be to use statement expression (which is a GCC extension but is supported by at least clang and msvc) #define all_bits_set(value, mask) ({__typeof__(value) v = (value), m = (mask); (v & m) == m; }) I personally would go for the extension aboveor a single 64 bit function, but here's the _Generic version: static bool all_bits_set32(i32 value, i32 mask) { return (value & mask) == mask; } static bool all_bits_set64(i64 value, i64 mask) { return (value & mask) == mask; } #define all_bits_set(value, mask) _Generic((value), int32_t: all_bits_set32, int64_t: all_bits_set64)(value, mask)