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#if __has_feature(objc_generics)
# define OF_HAVE_GENERICS
# define OF_GENERIC(...) <__VA_ARGS__>
#else
# define OF_GENERIC(...)
#endif
#if __has_feature(objc_kindof)
# define OF_KINDOF(cls) __kindof cls
#else
# define OF_KINDOF(cls) id
#endif
#if defined(__clang__) || __GCC_VERSION__ >= 405
# define OF_UNREACHABLE __builtin_unreachable();
#else
# define OF_UNREACHABLE abort();
#endif
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