重载和覆盖方法

红莲教主

笔记：重载方法是在一个类中，覆盖发生在基类和子类之间

问题：看不懂
F:\Q\方法覆盖和方法重载\main.cpp|86|warning: deleting object of polymorphic class type 'Animal' which has non-virtual destructor might cause undefined behaviour [-Wdelete-non-virtual-dtor]|

找到解决办法了，就是把Animal类的析构函数变为virtual ~Animal();

#include <iostream>
#include <string>

using std::cout;
using std::endl;
using std::string;

class Animal
{
public:
    Animal(string name);
    ~Animal();
    void eat(); //用来测试重载
    void eat(string food); //用来测试重载
    void say(); //用来测试覆盖
    virtual void run(); //用来测试覆盖
private:
    string name ;
};

Animal::Animal(string name)
{
    this->name = name ;
}

Animal::~Animal()
{

}

void Animal::eat()
{
    cout<<"我是个吃货，我正在吃东西！"<<endl;
}

void Animal::eat(string food)
{
    cout<<"我在吃"<<food<<endl;
}
void Animal::say()
{
    cout<<"我在跟你打招呼，(*^__^*) 嘻嘻……"<<endl;
}
void Animal::run()
{
    cout<<"我在追着你跑哦，我要咬死你"<<endl;
}


class Dog : public Animal
{
public:
    Dog(string name);
    ~Dog();

    void say();
    virtual void run(); //此处virtual可以不写，virtual会继承，virtual方法不能再次变为非virtual方法
};

Dog::Dog(string name):Animal(name)
{

}
Dog::~Dog()
{

}
void Dog::say()
{
    cout<<"我在汪汪汪。。。"<<endl;
}
void Dog::run()
{
    cout<<"我跑一会儿，撒一泡尿。。"<<endl;
}

int main()
{
    Animal* dog = new Dog("小白");
    dog->say();
    dog->run();

    dog->eat();
    dog->eat("粑粑");

    delete dog ;

    return 0 ;
}