Method Get

grape/utils/concurrent_queue.h:224–234

* @brief Get an entity from this queue. * * This function won't be blocked. * * @param item Reference of an entity to hold the got data. * * @return If got data, return true. Otherwise, return false. */

   * @return If got data, return true. Otherwise, return false.
   */
  bool Get(T& item) {
    bool ret = false;
    lock_.lock();
    if (!queue_.empty()) {
      ret = true;
      item = std::move(queue_.front());
      queue_.pop_front();
    }
    lock_.unlock();
    return ret;
  }

  void Clear() {
    lock_.lock();