void regress_foo_sub_interface_do_baz RegressFooSubInterface* self GCallback callback gpointer user_data regress_foo_sub_interface_do_baz void regress_foo_sub_interface_do_baz (RegressFooSubInterface* self, GCallback callback, gpointer user_data); <code>self</code> <code>callback</code> <code>user_data</code> <code>Returns</code>