December 2014
Beginner
300 pages
8h 9m
English
Content preview from Learning Swift™ ProgrammingBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Automatic Reference Counting
Now is a good time to talk about Automatic Reference Counting, otherwise known as ARC. If you are an Objective-C programmer, then you know all about ARC. If you were one of the first iPhone programmers, you know that you used to have to do your own reference counting. You will be happy to know that for the most part, you can let Swift worry about the management of memory.
When you create instances of classes, those classes exist by reference. When those instances are no longer needed, Swift cleans them up for you.
ARC works by keeping track of the instances of classes that you create and where those instances are referenced. Every time you create a new instance of a class, ARC finds some free memory available where ...
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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.
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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.