Function is_direct_instance

library/include/DataDefs.h:470–474

        }

        bool is_direct_instance(virtual_ptr instance_ptr) const {
            if (!instance_ptr) return false;
            auto vp = vtable_ptr();
            return vp ? (vp == get_vtable(instance_ptr)) : (this == get(instance_ptr));
        }

        template<class P> static P get_vmethod_ptr(P selector);