+/* tr_inheritance.h */
+#define is_subclass_of(low, high) is_SubClass_of(low, high)
+#define is_subclass_ptr_of(low, high) is_SubClass_ptr_of(low, high)
+#define is_superclass_of(high, low) is_SuperClass_of(high, low)
+#define is_superclass_ptr_of(low, high) is_SuperClass_ptr_of(low, high)