Cpp Singleton

//Singleton.cpp 默认构造函数
#include <iostream>

using namespace std;

class Singleton{
public:
    static Singleton* Instance();
private:
    Singleton(){}
    static Singleton * _instance;
};

Singleton* Singleton::_instance=0;
Singleton* Singleton::Instance(){
    if(_instance==0){
        _instance = new Singleton();
    }
    return _instance;
}

int main()
{
    for(int i=0;i<10;++i){
        Singleton *ps=Singleton::Instance();
        cout<< ps<<endl;
    }
    return 0;
}