Re: Nil items in NSMutableSet
Re: Nil items in NSMutableSet
- Subject: Re: Nil items in NSMutableSet
- From: Clark Cox <email@hidden>
- Date: Tue, 16 Mar 2010 10:46:21 -0700
On Tue, Mar 16, 2010 at 10:28 AM, Alejandro Rodriguez
<email@hidden> wrote:
> Hello All,
>
> I am using NSMutableSet quite extensively in my app mostly just adding items to it and reading them (almost never removing). However sometimes it crashes under very interesting conditions. I can't reliable recreate the issue but sometimes I get a 'attempted to insert nil' exception when FILTERING the set using a predicate, if I breakpoint at this exception and print the set description I see that it has many valid objects but also a bunch of nil (null) objects which doesn't make any sense since I can't insert nil objects to the set in the first place!
>
> I can't think of any scenario where I can insert nil objects to the set or insert a valid object which would then point nil. My app is multi-threaded and the set is accessed in @sychronized blocks from many threads all the time.
>
> Has anyone had a similar problem? am I missing something? is it a bug with the foundation object?
What kind of objects are in the set? What do their -isEqual: and -hash
methods look like? Is there any possibility that objects in that set
are changed in a way that affects the results returned by their
-isEqual: and/or -hash methods?
--
Clark S. Cox III
email@hidden
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