October 2018
Intermediate to advanced
370 pages
9h 15m
English
Content preview from Hands-On Object-Oriented Programming with Kotlin
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Visitor
The visitor pattern allows us to add new operations to an existing object without modifying it. This pattern is a way to extend functionality and follow the open/closed principle. It's better to try to understand this pattern using a particular example.
The following diagram represents the example that we will touch upon, as follows:
The preceding diagram contains the CarElement interface that is implemented by the Body and Engine classes. The CarElementDriverVisitor class implements the CarElementVisitor interface, which contains an instance of the CarElementVisitor type.
Let's define the CarElement interface:
interface CarElement ...
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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.