On Dec 9, 2012, at 7:24 PM, Igor Stasenko <siguc...@gmail.com> wrote:
> some years ago, its been a long discussion on squeak mailing list about that..
> imo association should compare keys. not values.
>
But it's not very clear why? Why should
(1 -> 2) = (1 -> 4)
be true? They are not the same!
If you want to compare keys, you can easily write
(1 -> 2) key = (1 -> 4) key
and the people reading the code will directly understand what your intention is.
Marcus
> But self-referencing data structures is and will be a problem. And
> there is no easy solution:
>
> a := Array new: 1.
> a at:1 put: a.
>
> a = a
>
> On 9 December 2012 17:20, Sven Van Caekenberghe <s...@stfx.eu> wrote:
>> I am not pro, see my comments in the issue tracker.
>>
>> For example,
>>
>> | a |
>> a := Association key: #foo.
>> (a value: (Array with: a)) = (a value: (Array with: a)).
>>
>> would still loop.
>>
>> Loops like that cannot be prevented locally.
>>
>> See my other mail about prevent stack overflow.
>>
>> On 09 Dec 2012, at 16:32, Stéphane Ducasse <stephane.duca...@inria.fr> wrote:
>>
>>> Hi guys
>>>
>>> what is the impact on method =?
>>> Any ideas?
>>>
>>> Stef
>>> On Dec 8, 2012, at 5:57 PM, Ciprian Teodorov wrote:
>>>
>>>> It seems that this issue can be fixed by modifying the = method in
>>>> Association.
>>>>
>>>> Association>>= anAssociation
>>>> ^ super = anAssociation
>>>> and: [
>>>> value == anAssociation value
>>>> ifTrue: [ true ]
>>>> ifFalse: [ value = anAssociation value ] ]
>>>>
>>>> Cheers...
>>>>
>>>> On Sat, Dec 8, 2012 at 5:35 PM, Benoit St-Jean <bstj...@yahoo.com> wrote:
>>>> Same behavior in Squeak 4.2 btw
>>>>
>>>> -----------------
>>>> Benoit St-Jean
>>>> Yahoo! Messenger: bstjean
>>>> A standpoint is an intellectual horizon of radius zero.
>>>> (Albert Einstein)
>>>> From: Ciprian Teodorov <ciprian.teodo...@gmail.com>
>>>> To: Pharo-project@lists.gforge.inria.fr
>>>> Sent: Saturday, December 8, 2012 11:11:44 AM
>>>> Subject: Re: [Pharo-project] strange == behavior
>>>>
>>>> by the way, we have the same thing in 1.0, 1.1, 1.3.
>>>>
>>>> On Sat, Dec 8, 2012 at 5:10 PM, Ciprian Teodorov
>>>> <ciprian.teodo...@gmail.com> wrote:
>>>> Hi guys,
>>>>
>>>> Playing with some recursive data-structure I have found some strange piece
>>>> of behavior in Pharo.
>>>>
>>>> If in an workspace we try to evaluate:
>>>>
>>>> a := Association new.
>>>> a key: 3.
>>>> a value: a.
>>>> a == a value.
>>>>
>>>> the first time we get "true", the second we get an infinite loop...
>>>>
>>>> A simple workaround is to declare "a":
>>>>
>>>> |a|
>>>> a := Association new.
>>>> a key: 3.
>>>> a value: a.
>>>> a == a value.
>>>>
>>>> My question now is: Is this a bug or a feature ?
>>>> By the way the same thing happens in 1.4 and 2.0 equally.
>>>>
>>>> By the way, in Pharo 2.0 doing cmd + . erases the lines selected in the
>>>> workspace replacing them by "."
>>>>
>>>> Cheers,
>>>> --
>>>> Dr. Ciprian TEODOROV
>>>> Ingénieur Développement CAO
>>>>
>>>> tél : 06 08 54 73 48
>>>> mail : ciprian.teodo...@gmail.com
>>>> www.teodorov.ro
>>>>
>>>>
>>>>
>>>> --
>>>> Dr. Ciprian TEODOROV
>>>> Ingénieur Développement CAO
>>>>
>>>> tél : 06 08 54 73 48
>>>> mail : ciprian.teodo...@gmail.com
>>>> www.teodorov.ro
>>>>
>>>>
>>>>
>>>>
>>>>
>>>> --
>>>> Dr. Ciprian TEODOROV
>>>> Ingénieur Développement CAO
>>>>
>>>> tél : 06 08 54 73 48
>>>> mail : ciprian.teodo...@gmail.com
>>>> www.teodorov.ro
>>>
>>>
>>
>>
>
>
>
> --
> Best regards,
> Igor Stasenko.
>
