@@ -99,10 +99,25 @@
 	return class_getName(self);
 #else
 	return class_get_class_name(self);
 #endif
 }
+
++ (BOOL)isSubclassOfClass: (Class)class
+{
+	Class iter;
+
+#ifdef OF_APPLE_RUNTIME
+	for (iter = self; iter != Nil; iter = class_getSuperclass(iter))
+#else
+	for (iter = self; iter != Nil; iter = class_get_super_class(iter))
+#endif
+		if (iter == class)
+			return YES;
+
+	return NO;
+}
 
 + (BOOL)instancesRespondToSelector: (SEL)selector
 {
 #ifdef OF_APPLE_RUNTIME
 	return class_respondsToSelector(self, selector);