c++多态例子

导入头

#include <iostream>

using namespace std;

Animal

class Animal {
public:
    virtual void cry(){
        cout << "Animal Cry" << endl;
    }

    void name(){
        cout << "Animal Name " << endl;
    }

};

Dog

class Dog : public Animal {
public:
    virtual void cry(){
        cout << "Dog Cry" << endl;
    }

    void name(){
        cout << "Dog Name " << endl;
    }

};

main

int main(){

    Animal *animal1 = new Dog();
    animal1->cry(); //Dog::cry();
    Dog *dog1 = new Dog();
    dog1->cry(); //Dog::cry();

    animal1->name(); // Animal::name();
    dog1->name(); // Dog::name();

    return 1;
}

输出

Dog Cry
Dog Cry
Animal Name
Dog Name

从上面可以看出，没有加virtual 的函数，不是调用子类覆盖的方法

而加了virtual 的函数，都是调用子类覆盖的方法(Dog::cry())