Edit Question - KnowledgeHub

Title Body

For the most part with ARC (Automatic Reference Counting), we don't need to think about memory management at all with Objective-C objects. It is not permitted to create NSAutoreleasePool s anymore, however there is a new syntax: @autoreleasepool { … } My question is, why would I ever need this when I'm not supposed to be manually releasing/autoreleasing ? EDIT: To sum up what I got out of all the anwers and comments succinctly: New Syntax: @autoreleasepool { … } is new syntax for NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init]; … [pool drain]; More importantly: ARC uses autorelease as well as release . It needs an auto release pool in place to do so. ARC doesn't create the auto release pool for you. However: The main thread of every Cocoa app already has an autorelease pool in it. There are two occasions when you might want to make use of @autoreleasepool : When you are in a secondary thread and there is no auto release pool, you must make your own to prevent leaks, such as myRunLoop(…) { @autoreleasepool { … } return success; } . When you wish to create a more local pool, as @mattjgalloway has shown in his answer.

Tags (comma-separated) Cancel