singelton designpattern

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#include <iostream>
#include <string>
#include <vector>
using namespace std;
class Singelton
{
private:
	Singelton(){}
	static Singelton* singel;
public:
	static Singelton* GetInstance()
	{
		if(singel == NULL)
		{
			singel = new Singelton();
		}
		return singel;
	}
};
Singelton* Singelton::singel = NULL;//注意静态变量类外初始化
int main()
{
	Singelton* s1=Singelton::GetInstance();
	Singelton* s2=Singelton::GetInstance();
	if(s1 == s2)
		cout<<"ok"<<endl;
	else
		cout<<"no"<<endl;
	return 0;
}

c++