继承和多态

使用继承建立类族，让多态有用武之地。

class CHuman

{

    ...

public :

    virtual void eat() const;

    ...

};

class CAmerican : public CHuman

{

    ...

public :

    void eat() const;

    ...

};

class CRussian : public CHuman

{

    ...

public :

    void eat() const;

    ...

};

void eat_food(CHuman * pHuman)

{

    pHuman->eat();

}

int main()

{

CAmerican American;

eat_food(&American)

CRussian Russian;

eat_food(&Russian);

return 0;

}