虚析构函数的作用

#include <iostream>
using namespace std;

//虚析构函数的作用
class Animal
{
public:
Animal();
virtual ~Animal();
virtual void eat()
{
cout << "Animal eat\n ";
}
private:
int m_iage;

};

Animal::Animal()
{
cout << "Animal Constructr\n";
}

Animal::~Animal()
{
cout << "Animal Deconstructr\n";
}

class Fish : public Animal
{
public:
Fish();
~Fish();
void eat()
{
cout << "Fish eat\n";
}
private:
int m_iage;

};

Fish::Fish()
{
cout << "Fish Constructr\n";
}

Fish::~Fish()
{
cout << "Fish Deconstructr\n";
}

int main()
{
Animal*  pFish = new Fish();
pFish->eat();
delete pFish;
return 0;
}