纯虚函数在C ++中的用途是什么？ [英] What are the uses of pure virtual functions in C++?

问题描述

我现在正在学习一个类中的C ++，而且我并不熟悉纯虚函数。我理解他们后来在一个派生类中概述，但是如果你只是在派生类中定义它，你为什么要声明它等于0？

I'm learning about C++ in a class right now and I don't quite grok pure virtual functions. I understand that they are later outlined in a derived class, but why would you want to declare it as equal to 0 if you are just going to define it in the derived class?

解决方案

Briefly, it's to make the class abstract, so that it can't be instantiated, but a child class can override the pure virtual methods to form a concrete class. This is a good way to define an interface in C++.

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