November 2001
Beginner
1128 pages
29h 12m
English
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Abstract Base Classes
So far you've seen simple inheritance and the more intricate polymorphic inheritance. The next step in increasing sophistication is the abstract base class, or ABC. Let's look at some programming situations that provide the background for the ABC.
Sometimes the application of the is-a rule is not as simple as it might appear. Suppose, for example, you are developing a graphics program that is supposed to represent, among other things, circles and ellipses. A circle is a special case of an ellipse; it's an ellipse whose long axis is the same as its short axis. Therefore, all circles are ellipses, and it is tempting to derive a Circle class from an Ellipse class. But once you get to the details, you may find problems.
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.