Re: [Rubycocoa-talk] Sporadic application failure

[Tim B. <tim...@gm...>]

Hi Laurent,

Thanks, but that doesn't seem to explain why Tim's ObjC-only example  
didn't suffer the exception.  I've seen the same thing with ObjC-only  
applications.  You're the only one of us who can see the code in  
question -- what's going on?

best regards (and congratulations, btw!),

Tim

On Dec 2, 2007, at 4:32 PM, Laurent Sansonetti wrote:

> On Dec 3, 2007, at 1:20 AM, Tim Burks wrote:
>
>>
>> Hi Tim,
>>
>> Your post reminded me of a problem that I recently had while working
>> with Nu.  So I ported your example to Nu and saw the same message.
>> I think the problem is in the PSMTabBarControl framework.  If you
>> look at PSMTabBarControl.m, you'll see this method:
>>
>> - (void)tabViewDidChangeNumberOfTabViewItems:(NSTabView *)aTabView
>> {
>>    NSArray *tabItems = [tabView tabViewItems];
>>    // go through cells, remove any whose representedObjects are not
>> in [tabView tabViewItems]
>>    NSEnumerator *e = [_cells objectEnumerator];
>>    PSMTabBarCell *cell;
>>    while(cell = [e nextObject]){
>>        if(![tabItems containsObject:[cell representedObject]]){
>>            [self removeTabForCell:cell];
>>        }
>>    }
>>   ...
>>
>> This method is, in fact, mutating the _cells collection while it is
>> enumerating it.  I've heard that Leopard treats this more strictly,
>> so that might explain the exception.  I modified this method,
>> replacing the call that creates the object enumerator with this:
>> [...]
>
> Definitely, good catch!
>
> FYI, the rationale behind this new exception is explained in http://developer.apple.com/releasenotes/Cocoa/Foundation.html
>  in the "Warning about mutations during enumerations" section.
>
> Laurent
>
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