c++动态多态，父类虚函数，父类引用指向子类实现

 /*动态多态
 1：子类继承父类
 2：子类重写父类虚函数
 3：父类引用指向子类实现
 */
class Animal {
public:

	virtual void speak() {//虚函数//虚函数指针 vfptr->虚函数表vftable
		cout << "animal shout" << endl;
	}

};

class Cat :public Animal{

public:
	void speak() {//重写
		cout << "喵喵" << endl;
	}
};

class Dog :public Animal {

public:
	void speak() {//重写
		cout << "汪汪" << endl;
	}
};


void doSpeak(Animal& animal) {//父类引用指向子类实现
	animal.speak();
}



void test() {

	Cat cat;
	doSpeak(cat);
	Dog dog;
	doSpeak(dog);
}

int main() {
	test();
}

/*结果：
喵喵
汪汪
*/