在C++98基础上学习C++11新特性(5)

class father {
public:
    father() {
        cout << "father !" << endl;
    }
    ~father() {
        cout << "~~~~~father !" << endl;
    }
    void setSon(shared_ptr<son> s) {
        son = s;
    }
private:
    //shared_ptr<son> son;
    weak_ptr<son> son; // 用weak_ptr来替换
};

class son {
public:
    son() {
        cout << "son !" << endl;
    }
    ~son() {
        cout << "~~~~~~son !" << endl;
    }
    void setFather(shared_ptr<father> f) {
        father = f;
    }
private:
    shared_ptr<father> father;
};

void test() {
    shared_ptr<father> f(new father());
    shared_ptr<son> s(new son());
    f->setSon(s);
    s->setFather(f);
}

int main()
{
    test();
    return 0;
}

输出：
father !
son !
~~~~~~son !
~~~~~father !