基类的技巧:非拷贝类对象 & 单例

（1）non-copyable class

 

class CJack {

private:
	CJack(const CJack& rhs);
	CJack& operator=(const CJack& rhs);

public:
	CJack();
	~CJack();

};

(2)singleton class

 

class CJean {

	static CJean* ms_instance;

public:
	static CJean* Instance();
	static void Release();

private:
	CJean();
	~CJean();

};

 

CJean* CJean::ms_instance = 0;

CJean::CJean()
{
}

CJean::~CJean()
{
}

CJean* CJean::Instance()
{
	if(ms_instance == 0){
		ms_instance = new CJean();
	}
	return ms_instance;
}

void CJean::Release()
{
	if(ms_instance){
		delete ms_instance;
	}
	ms_instance = 0;
}