设计模式--单件实现C++

/*********************************

*设计模式--单件实现

*C++语言

*Author：WangYong

*Blog:http://www.cnblogs.com/newwy

********************************/

#include <iostream>

using namespace std;



class Singleton

{

public:

	static Singleton * Instance()

	{

		if(_instance == 0)

			_instance = new Singleton();

		return _instance;

	}

protected :

	Singleton () {cout<<"Singleton ....";}

private:

	static Singleton * _instance;

};

Singleton* Singleton::_instance = 0;



int main()

{

	Singleton *sgn = Singleton::Instance();

	return 0;

}