Re: How do I temporary retain self, under ARC?
Re: How do I temporary retain self, under ARC?
- Subject: Re: How do I temporary retain self, under ARC?
- From: Andy Lee <email@hidden>
- Date: Fri, 18 Jul 2014 10:10:53 -0400
And of course the second I hit Send I realized the do {} idea doesn't work. Imagine if it was some variable other than self that you might *deliberately* use to indicate when the loop should terminate.
--Andy
--Andy
> On Jul 18, 2014, at 10:07 AM, Andy Lee <email@hidden> wrote:
>
> You could even eliminate the (admittedly negligible) cost of setting keepAlive = nil by changing the if(keepAlive) to if(!keepAlive).
>
> Along the lines of avoiding a message send, I wonder if this would work:
>
> do {
> // ...
> } while (!self);
>
> --Andy
>
>> On Jul 18, 2014, at 9:41 AM, Gerd Knops <email@hidden> wrote:
>>
>> That's similar to what I have used. Initially it started out simply as
>>
>> id keepAlive=self;
>> ...
>> keepAlive=nil;
>>
>> but a few Xcode versions ago the static analyzer started complaining that it wasn't really doing anything. So that last line became
>>
>> if(keepAlive) { keepAlive=nil; }
>>
>> which shut up the analyzer. [keepAlive self]; like Andy suggests would probably work just as well, though probably a tad more expensive as a method call is involved.
>>
>> Gerd
>>
>>>> On Jul 17, 2014, at 11:23 PM, Andy Lee <email@hidden> wrote:
>>>>
>>>> On Jul 17, 2014, at 11:01 PM, Jens Alfke <email@hidden> wrote:
>>>> Once I’ve identified such a bug, the fix is easy: put a [[self retain] autorelease] at the top of the method. Except now I’m using ARC, and I can’t find a simple way of doing it. I tried adding
>>>> __unused id retainedSelf = self;
>>>> but the optimizer recognizes that retainedSelf isn’t used and strips it out, making this a no-op. The only thing I’ve found that works is
>>>> CFRetain((__bridge CFTypeRef)self);
>>>> at the top of the method, and a corresponding CFRelease at the end, but this is pretty ugly and could cause leaks if the method returns early.
>>>
>>> How about
>>>
>>> id retainedSelf = self;
>>>
>>> at the beginning and
>>>
>>> [retainedSelf self];
>>>
>>> at the end?
>>>
>>> --Andy
>>>
>>>
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