Re: confused by what seems to be a recursive declaration/definition
Re: confused by what seems to be a recursive declaration/definition
- Subject: Re: confused by what seems to be a recursive declaration/definition
- From: Kyle Sluder <email@hidden>
- Date: Thu, 11 Aug 2011 21:22:06 -0700
On Thu, Aug 11, 2011 at 9:11 PM, Jens Alfke <email@hidden> wrote:
>
> On Aug 11, 2011, at 8:59 PM, Jim Correia wrote:
>
>> For KVO contexts, you don't care about the value, but you do care that it is unique.
>
> I generally use a selector for this purpose. It doesn’t require a separate definition, and it’s also easy to use it to tell the observer to delegate to the method with that name.
This might break under ARC. See:
https://llvm.org/viewvc/llvm-project/cfe/trunk/test/SemaObjC/arc-peformselector.m?diff_format=c&view=markup&sortby=date&pathrev=134449
Basically, if ARC doesn't know what the selector is that you're
passing to -performSelector:, it can't reason about retain/release and
it warns that it might leak. It explicitly refuses to call
-performSelector: with a selector that returns a +1 reference.
--Kyle Sluder
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