Re: __weak references in non-GC
Re: __weak references in non-GC
- Subject: Re: __weak references in non-GC
- From: Corbin Dunn <email@hidden>
- Date: Mon, 01 Feb 2010 08:38:57 -0800
On Feb 1, 2010, at 6:08 AM, Roland King wrote:
> I read the following passage (reproduced verbatim) in a book ..
>
> "Weak references were added in Mac OS X Leopard and effectively zero out the reference if the referenced object is released. This is primarily used when the garbage collector is turned on, but it is a helpful flag to use when doing non-GC development (such as for the iPhone) as well."
>
> This is in a paragraph explaining __weak in a piece of code.
>
> I understand that __weak references are zeroing in GC code but in memory managed code I didn't think they did anything at all. Is the text I quoted incorrect?
As Joar said, it doesn't do anything for the runtime. However, I think the statement was referring to it being a useful flag for the programmer to know it is a weak (non retained) variable.
--corbin
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