Method finalize_impl

gi/wrapperutils.h:1221–1224

 protected:
    void finalize_impl(JS::GCContext*, JSObject* obj) {
        static_cast<Instance*>(this)->remove_associated_memory(obj);
        delete static_cast<Instance*>(this);
    }

    void add_associated_memory(JSObject*) { }
    void remove_associated_memory(JSObject*) { }