单例模式

#include <iostream>using namespace std;class Singleton{public:    static Singleton *Instance()    {        if(instance == 0)        {            instance = new Singleton();        }        return instance;    }private:    static Singleton *instance;    Singleton(){ cout << "Singleton....."<< endl;}};Singleton *Singleton::instance = 0;int main(){    Singleton *single =Singleton::Instance();    return 0;}