Function empty

src/UtilsCtrl/ThreadPool/Queue/UAtomicQueue.h:118–121

* 判定队列是否为空 * @return */

     * @return
     */
    [[nodiscard]] CBool empty() {
        CGRAPH_LOCK_GUARD lk(mutex_);
        return queue_.empty();
    }

    CGRAPH_NO_ALLOWED_COPY(UAtomicQueue)