Method empty

src/core/impl/graph/operator_node.cpp:30–32

        VarNodeMemManager* need_mem_mgr = nullptr;

        bool empty() const {
            return !need_mem_mgr && !shape_sync_hdl && !value_sync_hdl;
        }
    };
    CompNode m_comp_node;
    // VarNodes in m_items should be listed in the same order as in the