c++随手笔记（七）单例设计模式

#include 
class MyCAS
{
private:
	MyCAS() {}  //构造函数是私有的
private:
	static MyCAS* m_instance;
public:
	static MyCAS* GetInstance()
	{
		if (m_instance == nullptr)
		{
			std::unique_lock mymutex(resource_mutex);
			if (m_instance == nullptr)
			{
				m_instance = new MyCAS();
				static CGarhuishou c1;
			}
			return m_instance;
		}
	}

	class CGarhuishou
	{
	public:
		~CGarhuishou()
		{
			if (MyCAS::m_instance)
			{
				delete MyCAS::m_instance;
				MyCAS::m_instance = nullptr;
			}
		}
	};

private:
	static std::mutex resource_mutex;

};