单例模式_yuan1988219_新浪博客

//懒汉式：加lock，线程安全


std::mutex mt;



class Singleton
{


public:
    static Singleton* getInstance();

private:
    Singleton(){}
    

Singleton(const Singleton&) = delete;  //明确拒绝
    

Singleton& operator=(const Singleton&) = delete; //明确拒绝

    
static Singleton* m_pSingleton;
    
};


Singleton* Singleton::m_pSingleton = NULL;



Singleton* Singleton::getInstance()

 {

      if(m_pSingleton == NULL)
    

       { 

             mt.lock();
        

             m_pSingleton = new Singleton();
        

              mt.unlock();
    

        }
    

       return m_pSingleton;


}