class Dog {
public:
    ~Dog() { cout << "Dog destroyed" << endl; }
};

class Yellowdog : public Dog {
public:
    ~Yellowdog() { cout << "Yellow dog destroyed." << endl; }
};

class DogFactory {
public:
    static Dog* createYellowDog() { return (new Yellowdog()); }
    // do others...
};

int main() {
    Dog* pd = DogFactory::createYellowDog();

    delete pd;
    // only Dog destructor Called!
    // 우리는 YellowDog destructor도 호출을 원한다.

    return 0;
}

class Dog {
public:
    virtual ~Dog() { cout << "Dog destroyed" << endl; }
};

class Yellowdog : public Dog {
public:
    ~Yellowdog() { cout << "Yellow dog destroyed." << endl; }
};

class DogFactory {
public:
    static Dog* createYellowDog() { return (new Yellowdog()); }
    // do others...
};

int main() {
    Dog* pd = DogFactory::createYellowDog();

    delete pd;
    // YellowDog and Dog destructor Called!

    return 0;
}

class Dog {
public:
    ~Dog() { cout << "Dog destroyed" << endl; }
};

class Yellowdog : public Dog {
public:
    ~Yellowdog() { cout << "Yellow dog destroyed." << endl; }
};

class DogFactory {
public:
    static shared_ptr<Dog> createYellowDog() { return shared_ptr<Yellowdog>(new Yellowdog()); }
    // do others...
};

int main() {
    shared_ptr<Dog> pd = DogFactory::createYellowDog();

    // delete pd;
    // Shared_ptr(스마트포인터)은 자동으로 소멸자 호출

    return 0;
}