Re: Zeroing out instance variables
Re: Zeroing out instance variables
- Subject: Re: Zeroing out instance variables
- From: Ken Thomases <email@hidden>
- Date: Sat, 17 Apr 2010 09:16:08 -0500
On Apr 17, 2010, at 8:53 AM, Paul Sanders wrote:
> Something I've never been clear about though is
> where an object's retain count is stored. This obviously
> requires an iVar somewhere (in addition to isA), so there might
> be a trap for the unwary there [...]
My understanding, which is vague and for which I have no references, is that it's handled in a manner similar to what was recently exposed via the associated references API (i.e. objc_setAssociatedObject and friends).
That is, retain counts are stored outside of the instance.
Having just looked up the source for CFRelease, I can't say my understanding has increased. ;) Although, there is confirmation there that the retain count is at least sometimes held externally.
Would be an interesting subject for Mr. Bumgarner to expound upon on his blog.
Cheers,
Ken
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