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Re: NSDictionary, allKeys and the NSAutoreleasePool
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Re: NSDictionary, allKeys and the NSAutoreleasePool


  • Subject: Re: NSDictionary, allKeys and the NSAutoreleasePool
  • From: Jens Alfke <email@hidden>
  • Date: Thu, 3 Sep 2009 11:47:42 -0700


On Sep 3, 2009, at 11:40 AM, Scott Andrew wrote:

I could have sworn in either the apple docs (or one of the cocoa books, maybe this board). I maybe thinking of the general rule that you don't own the object until you retain it and its only valid or the within the method that its recieved. My bad.

Here's an example of a return value that isn't autoreleased:

- (Foo*) foo {
	static Foo* sharedFoo;
	if (!sharedFoo) sharedFoo = [[Foo alloc] init];
	return _sharedFoo;
}

Another example is a simple getter that simply returns an instance variable (which is the way I still choose to write most of my getters.)

The general principle is that returned object references are not guaranteed to stick around, unless you retain them. Autoreleasing is just one way for the called method to do that.

—Jens_______________________________________________

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  • Follow-Ups:
    • Re: NSDictionary, allKeys and the NSAutoreleasePool
      • From: Greg Parker <email@hidden>
References: 
 >NSDictionary, allKeys and the NSAutoreleasePool (From: Horst Jäger <email@hidden>)
 >Re: NSDictionary, allKeys and the NSAutoreleasePool (From: Scott Andrew <email@hidden>)
 >Re: NSDictionary, allKeys and the NSAutoreleasePool (From: mmalc Crawford <email@hidden>)
 >Re: NSDictionary, allKeys and the NSAutoreleasePool (From: Scott Andrew <email@hidden>)

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