设计模式之Singleton模式【类只有一个对象】

#include <stdio.h>

class Singleton
{
public:
    static Singleton* Intance()
    {
        if(!mSingleTon)
            mSingleTon=new Singleton();
        return mSingleTon;
    }
protected:
    Singleton()
    {
        printf("object init");
    }
private:
    static Singleton* mSingleTon;
};

Singleton* Singleton::mSingleTon=NULL;

int main()
{
    Singleton *sgn = Singleton::Intance();
    Singleton *sgn2=Singleton::Intance();
    return 0;
}