-#define register_callback_def(cb, arg) \
- _register_callback(typesafe_cb_def(void, (cb), (arg)), (arg))
-
-#define register_callback_exact(cb, arg) \
- _register_callback(typesafe_cb_exact(void, (cb), (arg)), (arg))
+#define register_callback(cb, arg) \
+ _register_callback(typesafe_cb(void, const void *, (cb), (arg)), (arg))