Get up to 80 % extra points for free! More info:

Lesson 15 - Polymorphism in C++

In the previous lesson, A mage for the C++ arena, we created a mage. He can fight, but he's not in the arena yet. We haven't added it to the arena because it can only handle warriors so far. So in today's tutorial, we have to tell C++ that Mage is really a warrior and can be treated like one.


Don't be scared of the obscure name of this technique, it's actually very simple. Polymorphism allows us to use a unified interface to work with objects of different types. Imagine that we have, for example, many objects representing geometric shapes (circles, squares, triangles, and so on). It'd certainly be helpful if we could communicate with them in some unified way even though they're different. We can create a GeometricShape class containing a color field and a render() method. All the geometric shapes would then inherit the interface from this class. Now you may be thinking, "But the circle and square object would render differently!." Well, polymorphism allows us to override the render() method in every subclass so it will do what we want. The interface will be unified and we won't have to think about which method to call to render different objects.

Polymorphism is often explained using animals. All having a speak() method in their interface, but each animal performs it differently:


...End of the preview...
Continue further

You will gain knowledge worth hundreds of thousands for a few crowns

You've come here and that's great! We believe that the first lessons showed you something new and useful
Do you want to continue the course? Go to the premium section.

Limited offer: Learn all knowledge and save money

Buy all currently available lessons with exercise submitting and other features for an exclusive price $12.24
Current account balance $0
By buying this exclusive package, you'll have access to all 25 lessons in this course including exercise submitting while saving $2.16. This offer is limited for the first lessons only with an additional exclusive 15% discount.

This article is licensed: Premium, by buying this article, you agree with the terms of use.

What will you get from us in the next lessons?
  • Unlimited and permanent access to individual lessons.
  • High quality IT knowledge.
  • Skills to help you get your dream and well-paid job.

Article description

Requested article covers this content:

In this C++ tutorial, we'll look at one of the most difficult topics of object-oriented programming, polymorphism, and virtual methods.

You gain credits by supporting our network. This is done by sending a helpful amount of money to support the site, or by creating content for the network.

Article has been written for you by Patrik Valkovic