RAII封裝

在c++中可以藉助RAII來完成對對象地處理，避免到處異常釋放對應地資源。

#ifndef __ONCE_RAII_H__
#define __ONCE_RAII_H__
#include <functional>
using namespace std;
namespace toolkit {

	class onceRAII {
	public:
		typedef function<void(void)> task;
		onceRAII(const task &onConstructed, const task &onDestructed = nullptr) {
			if (onConstructed) {
				onConstructed();
			}
			_onDestructed = onDestructed;
		}
		onceRAII(const task &onConstructed, task &&onDestructed) {
			if (onConstructed) {
				onConstructed();
			}
			_onDestructed = std::move(onDestructed);
		}
		~onceRAII() {
			if (_onDestructed) {
				_onDestructed();
			}
		}
	private:
		onceRAII();
		onceRAII(const onceRAII &);
		onceRAII(onceRAII &&);
		onceRAII &operator =(const onceRAII &) = delete;
		onceRAII &operator =(onceRAII &&) = delete;
		task _onDestructed;
	};

}//namespace toolkit
#endif //__ONCE_RAII_H__

#include <iostream>
#include <thread>
#include "onceRAII.h"
using namespace std;
using namespace toolkit;
int main()
{
	bool flag = false; //測試標識
	{
		onceRAII oncetest([&]() {
			flag = true;
			cout << "測試開始" << endl;
		}, [&]() {
			flag = false;
			cout << "測試終止" << endl;
		});
		std::this_thread::sleep_for(std::chrono::seconds(2));
	}
	system("pause");
	return 0;
}