class Singleton  // 这是两种方式{private:        static Singleton single;    Singleton(){}    Singleton &operator=(Singleton & s)// 屏蔽拷贝构造函数和赋值操作符    {    }    Singleton(const Singleton &s){}public:    int m_value;    static Singleton * getInstance()    {        return &single;    }};Singleton Singleton::single;class CSingleton{private:    CSingleton()   //构造函数是私有的    {    }    CSingleton(const CSingleton &);    CSingleton & operator = (const CSingleton &);public:    static CSingleton & GetInstance()    {        static CSingleton instance;   //局部静态变量        return instance;    }};