I used them in 2012 when dealing with capturing AV input from the front and 
back cameras on iDevices with ARC code.

IIRC, they were in the Apple sample code.





> On Jul 12, 2017, at 11:54 AM, Jeremy Hughes <moon.rab...@virginmedia.com> 
> wrote:
> 
>> On 12 Jul 2017, at 17:41, Jens Alfke <j...@mooseyard.com> wrote:
>> 
>> There may still be a reference in the autorelease pool. Check childReference 
>> again ‘later’, i.e. on the next user event or after a timer/delayed-perform.
> 
> Thanks.
> 
> I’d forgotten about autorelease pools - but I guess they’re still there in 
> Cocoa for backwards compatibility with pre-ARC code.
> 
> Jeremy
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