单例模式--Singleton with C++

//Singleton
#include <memory>
#inlcude <mutex>


//懒汉（） 线程不安全 
class MySingleton{

private:
	MySingleton(){}
	static MySingleton *m_msOnlyOnce;

public:
	static MySingleton *getInstance(){
		if ( m_msOnlyOnce == NULL )
		{
			m_msOnlyOnce = new MySingleton();
		}
		return m_msOnlyOnce
	}

	void otherMethod();
};

///
//饿汉模式
class MySingleton_ehan{

private:
	MySingleton_ehan(){}
	static MySingleton_ehan *m_msOnlyOnce;

public:
	static MySingleton_ehan *getInstance(){
		return m_msOnlyOnce ;
	}

	void otherMethod();
};

static MySingleton_ehan *m_msOnlyOnce = new MySingleton_ehan();

/

//smart pointer 
//借鉴别人的代码 
class CSingleton{

public:
	virtual ~CSingleton();
	static CSingleton &GetInstance();

private:
	static std::unique_ptr<CSingleton> m_instance;
	static std::onec_flag m_onceFlag;
	CSingleton(void);
	CSingleton(const CSingleton &src);
	CSingleton& operator=(const CSingleton& rhs);
};


std::unique_ptr<CSingleton> CSingleton::m_instance;
std::onec_flag CSingleton::m_onceFlag;

CSingleton& CSingleton::GetInstance(){
	std::call_once(m_onceFlag,
		[] {
			m_instance.reset(new CSingleton);
		});
	return *m_instance.get();
}
///