text: ﻿/*
   * MIT License
   *
   * Copyright (c) 2016 xiongziliang <771730766@qq.com>
   *
   * Permission is hereby granted, free of charge, to any person obtaining a copy
   * of this software and associated documentation files (the "Software"), to deal
   * in the Software without restriction, including without limitation the rights
   * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
   * copies of the Software, and to permit persons to whom the Software is
   * furnished to do so, subject to the following conditions:
   *
   * The above copyright notice and this permission notice shall be included in all
   * copies or substantial portions of the Software.
   *
   * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
   * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
   * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
   * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
   * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
   * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
   * SOFTWARE.
   */
  
  #ifndef UTIL_ONCETOKEN_H_
  #define UTIL_ONCETOKEN_H_
  
  #include <functional>
  #include <type_traits>
  
  using namespace std;
  
  namespace toolkit {
  
  class onceToken {
  public:
  	typedef function<void(void)> task;
  	onceToken(const task &onConstructed, const task &onDestructed = nullptr) {
  		if (onConstructed) {
  			onConstructed();
  		}
  		_onDestructed = onDestructed;
  	}
  	onceToken(const task &onConstructed, task &&onDestructed) {
  		if (onConstructed) {
  			onConstructed();
  		}
  		_onDestructed = std::move(onDestructed);
  	}
  	~onceToken() {
  		if (_onDestructed) {
  			_onDestructed();
  		}
  	}
  private:
  	onceToken();
  	onceToken(const onceToken &);
  	onceToken(onceToken &&);
  	onceToken &operator =(const onceToken &);
  	onceToken &operator =(onceToken &&);
  	task _onDestructed;
  };
  
  } /* namespace toolkit */
  
  #endif /* UTIL_ONCETOKEN_H_ */
  