Re: NSDictionary and retaining values

Subject: Re: NSDictionary and retaining values

From: "Optical Ali" <email@hidden>

Date: Fri, 18 Apr 2008 15:00:49 -0500

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On Fri, Apr 18, 2008 at 1:45 PM, j o a r <email@hidden> wrote:

On Apr 18, 2008, at 11:04 AM, Mike Manzano wrote:

It should be 1 since you didn't alloc or manually retain kArr. -arrayWithObjects autoreleases the created array. This is true across the Cocoa framework: helper object creation methods always autorelease unless otherwise annotated in the docs.

On Apr 18, 2008, at 11:06 AM, stephen joseph butler wrote:

In this case, kArr is a key in the dictionary, so NSDictionary makes a copy (because keys must be immutable). So the retain count doesn't change.

In the general case, the retain count of an object could change in response to it being copied. A common optimization for immutable classes is to implement "-copy" as a call to "[self retain]". This is obviously a private implementation detail.

In this particular case though, the objects passed as keys are mutable, and they will for that reason not end up in the dictionary at all (Just as Stephen notes above, immutable copies will take their place). This is why you will find that their retain count stays at whatever it was before that call.

j o a r

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References:
	>NSDictionary and retaining values (From: "Optical Ali" <email@hidden>)
	>Re: NSDictionary and retaining values (From: Mike Manzano <email@hidden>)
	>Re: NSDictionary and retaining values (From: j o a r <email@hidden>)