#include <iostream>

using namespace std;

/***单例模式

* 自己的事情自己做！

* 保证线程安全

* ***/

class Father{

public:

static Father* getFather();

static void say(){

cout << "i am father" << endl;

}

private:

Father(){};

Father& operator=(const Father&);

Father(const Father&);

static Father* father;

virtual ~Father(){

delete father;

father = nullptr;

}

};

Father* Father::father = nullptr;

Father* Father::getFather(){

if(nullptr == father){

father = new Father();

}

return father;

}

int main(){

Father *iamfather = Father::getFather();

iamfather->say();

return 0;

}