Singleton模式原理和实现

Singleton模式其实是对全局静态变量的一个取代策略

 

class MySingleton{public:static MySingleton* GetInstance();void DestroyInstance();protected:MySingleton();~MySingleton();private:static MySingleton* _instance;};MySingleton* MySingleton::_instance = NULL;MySingleton* MySingleton::GetInstance(){if(_instance == NULL)_instance = new MySingleton();return _instance;}void MySingleton::DestroyInstance(){if(_instance != NULL){delete _instance;_instance = NULL;}}MySingleton::MySingleton(){}MySingleton::~MySingleton(){}