Re: [Rubycocoa-talk] Sporadic application failure

[Laurent S. <lsa...@ap...>]

Hi Tim(s) :-)

I suspect the ObjC-only project build is configured for a 10.4  
deployment, where the exception won't be raised for compatibility  
reasons. I didn't try it though, but I think that if you build for  
10.5 you will get the exception.

Cheers,
Laurent

On Dec 3, 2007, at 4:55 AM, Tim Burks wrote:

> 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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