Thanks chris since this is the question I was aksing myself.

Stef

On 20 sept. 05, at 07:40, Chris Muller wrote:


> Sorry if my "fix" disrupted you Andreas, I guess I fixed the wrong  
> thing.
> But while Dictionary's appear able to contain nil keys afterall,  
> what about
> WeakKeyDictionarys?  As their keys are garbage-collected and  
> converted to nil
> it would be unpredictable, at best.
>
> Therefore, what do you think of my overriding #associationsDo: in
> WeakKeyDictionary, which was the real crux of my original fix back  
> in June of
> '04?  I should have just stopped with this..
>
> associationsDo: aBlock
>     "Evaluate aBlock for each of the receiver's elements (key/value
>     associations)."
>
>     super associationsDo:
>         [ : eachAssoc |  | eachKey |
>         eachKey _ eachAssoc key.  "reference to ensure no GC"
>         eachKey ifNotNil: [ aBlock value: eachAssoc ] ]
>
> I've run with this since that time without any problem, but even  
> better with
> expert feedback.
>
> Incidentally, there may be a few special side-effects to having a  
> nil key in a
> regular Dictionary which could bite at some point.  For example:
>
>   (Dictionary new at: nil put: 'nil') keys
>
> Regards,
>  Chris
>
>
>
>