虚拟指针 [英] Virtual Pointer

问题描述

什么是虚拟指针？
全部，
今天我有一个电话面试，并得到一个问题：什么是虚拟指针？
我在这一个，所以完成后，我尝试谷歌。不幸的是，它给了我一个虚拟表引用。

What is virtual pointer? Hi, ALL, Today I had an telephone interview and got a question: "What is virtual pointer?" I stumbled on this one, so after it was finished, I tried Google. Unfortunately, it gave me a virtual table references only.

那么什么是虚拟指针在简单的英语？

So what is virtual pointer in plain English? How do you define it?

推荐答案

如何定义？

面试官可能有这样的意思：

There are a few things the interviewer might have meant:

• 指向多态类的指针


• 指向多态类的vtable的指针（信用@Maxim）


• 多态类的vtable中的指针


• 一个智能指针对象，重写 operator->


• 指向虚拟成员函数的指针（信用@ Matthieu M）

• A pointer to a polymorphic class
• A pointer to the vtable of a polymorphic class (credit @Maxim)
• A pointer within the vtable of a polymorphic class
• A smart pointer object with an overridden operator->
• A pointer to a virtual member function (credit @ Matthieu M)

但是，关于，没有这样的事情。

But as far as "virtual pointer" is concerned, there's no such thing.

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