Re: Swift crash in dispatch_apply
Re: Swift crash in dispatch_apply
- Subject: Re: Swift crash in dispatch_apply
- From: "Gerriet M. Denkmann" <email@hidden>
- Date: Tue, 08 Jul 2014 10:36:46 +0700
On 8 Jul 2014, at 10:03, Roland King <email@hidden> wrote:
>>> Why are you making self unowned?
>>
>> I have no idea.
>> The Swift book (in the chapter "“Resolving Strong Reference Cycles for Closures”) seems to say that this is the correct way to "resolve a strong reference cycle between a closure and a class instance”.
>
> Not quite - it says unowned if the block and self have the same lifetime, else weak.
The book says: “If the captured reference will never become nil, it should always be captured as an unowned reference, rather than a weak reference.”
And I can think of no way how "self" = instance of my Crash class could ever become nil while its function makeCrash is running.
Anyway: even without "[unowned self]" I always see a println() inside of deinit{} (if it is not crashing before).
Which might indicate that there are no evil retain-cycles taking place.
Could anybody show me some example which really needs [unowned self] or [weak self] to break a retain-cycle?
Kind regards,
Gerriet.
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