C/CPP-多态的常见例子

多态最常用的例子

// 父类
class animal
{
public:
  
    virtual void eat()
    {
        cout << "animal eat" << endl;
    }
    virtual void sleep()
    {
        cout << "animal sleep" << endl;
    }
};

// 子类
class person :public animal
{
public:
    void eat()
    {
        cout << "person eat" << endl;
    }
    void sleep()
    {
        cout << "person sleep" << endl;
    }
};

// 子类
class dog :public animal
{
public:
    void eat()
    {
        cout << "dog eat" << endl;
    }
    void sleep()
    {
        cout << "dog sleep" << endl;
    }
};

void xxx_fun(animal* ptr)
{
    ptr->eat();
    ptr->sleep();
}
void test()
{
    animal a;
    person p;
    dog d;

    xxx_fun(&a);
    xxx_fun(&p);
    xxx_fun(&d);
}