class Wife;
class Husband
{
public:
    void setWife(const shared_ptr<Wife>& wife)
    {
        this->myWife = wife;
        cout << "myWife's use_count" << myWife.use_count() << endl;
    }
    ~Husband()
    {
        cout << "myWife's use_count" << myWife.use_count() << endl;

        cout << "Husband is deleted" << endl;
    }

private:
    shared_ptr<Wife> myWife;
    //weak_ptr<Wife> myWife;

};
class Wife
{
public:
    void setHusband(const shared_ptr<Husband>& husband)
    {
        this->myHusband = husband;
        cout << "myHusband's use_count" << myHusband.use_count() << endl;
    }
    ~Wife()
    {
        cout << "myHusband's use_count" << myHusband.use_count() << endl;

        cout << "Wife is deleted" << endl;
    }

private:
    //shared_ptr<Husband> myHusband;
    weak_ptr<Husband> myHusband;

};

int main()
{
    shared_ptr<Husband> husband(new Husband);
    shared_ptr<Wife> wife(new Wife);
    husband->setWife(wife);
    wife->setHusband(husband);

}