December 2013
Beginner
576 pages
16h 4m
English
Content preview from Programming in Objective-C, Sixth Edition
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Automatic Garbage Collection
As of Objective C 2.0, a form of memory management known as garbage collection became available. With garbage collection, the system automatically determines which objects own which other objects, automatically freeing up (or garbage-collecting) objects that are no longer referenced as space is needed during the program’s execution.
The iOS runtime environment doesn’t support garbage collection, so you don’t have the option to use it when developing programs for that platform. And, as of OS X 10.8 (Mountain Lion), garbage collection is deprecated (meaning at some point in the near future it will no longer be supported). Apple therefore now discourages its use and advises you to use ARC instead.
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