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extern void objc_setProperty(id, SEL, ptrdiff_t, id, BOOL, signed char);
#define OF_IVAR_OFFSET(ivar) ((intptr_t)&ivar - (intptr_t)self)
#define OF_GETTER(ivar, atomic) \
return objc_getProperty(self, _cmd, OF_IVAR_OFFSET(ivar), atomic);
#define OF_SETTER(ivar, value, atomic, copy) \
objc_setProperty(self, _cmd, OF_IVAR_OFFSET(ivar), value, atomic, copy);
#if defined(__clang__) || __GCC_VERSION__ >= 405
# define OF_UNREACHABLE __builtin_unreachable();
#else
# define OF_UNREACHABLE abort();
#endif
#define OF_UNRECOGNIZED_SELECTOR \
[self doesNotRecognizeSelector: _cmd]; \
abort();
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