ObjFW  Diff

	if (oldimp == (IMP)0 || newimp == (IMP)0)
		@throw [OFInvalidArgumentException newWithClass: self
						    andSelector: _cmd];

	method->method_imp = newimp;
	return oldimp;
#else
	Method m;
	IMP imp;
	Method method = class_getInstanceMethod(self, selector);
	IMP imp = class_getMethodImplementation(class, selector);

	if ((m = class_getInstanceMethod(self, selector)) == NULL ||
	if (method == NULL || imp == NULL)
	    (imp = method_getImplementation(m)) == NULL)
		@throw [OFInvalidArgumentException newWithClass: self
						    andSelector: _cmd];

	return method_setImplementation(m, imp);
	return method_setImplementation(method, imp);
#endif
}

- init
{
	return self;
}