子类调用父类方法实现多态

class Base {
public:
    Base() {
        print();
    }
    virtual ~Base() {

    }
    void show()
    {
        print();
    }
    virtual void print() {
        std::cout << "Base::print" << std::endl;
    }
};

class Drived : public Base {
public:
    Drived() {
        print();
    }
    ~Drived() {
      
    }

    virtual void print()override
    {
        std::cout << "Drived::print" << std::endl;
    }
};

int main(int argc, char *argv[])
{
 
    Drived *b = new Drived();
    b->show();
    delete b;
    return a.exec();
}

res:

Base::print
Drived::print
Drived::print

两次Drived::print