小编Bal*_*ran的帖子

class base{
    .....
    virtual void function1();
    virtual void function2();
};

class derived::public base{
    int function1();
    int function2();
};

int main()
{
    derived d;
    base *b = &d;
    int k = b->function1() // Why use this instead of the following line?
    int k = d.function1(); // With this, the need for virtual functions is gone, right?

}

我不是CompSci工程师,我想知道这一点.如果我们可以避免基类指针,为什么要使用虚函数？