is this correct ?
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Hi! Look this peace of code:
| instance | instance := TestCase new. Transcript show: TestCase allInstances size; cr. instance become: 'aString'. Transcript show: TestCase allInstances size; cr. The size of TestCase instances is always the same. Although I used become: (and changed to an instance of another class) to one of its instances. So, my main question is, is this correct ? Or the message allInstances to TestCase should not take into account the instance I sent the message become: ? Thanks in advance. Mariano _______________________________________________ Pharo-project mailing list [hidden email] http://lists.gforge.inria.fr/cgi-bin/mailman/listinfo/pharo-project |
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On Dec 2, 2009, at 10:21 23AM, Mariano Martinez Peck wrote: > Hi! Look this peace of code: > > | instance | > instance := TestCase new. > Transcript show: TestCase allInstances size; cr. > instance become: 'aString'. > Transcript show: TestCase allInstances size; cr. > > > The size of TestCase instances is always the same. Although I used become: (and changed to an instance of another class) to one of its instances. > > So, my main question is, is this correct ? Or the message allInstances to TestCase should not take into account the instance I sent the message become: ? > > Thanks in advance. > > Mariano > > _______________________________________________ > Pharo-project mailing list > [hidden email] > http://lists.gforge.inria.fr/cgi-bin/mailman/listinfo/pharo-project I believe so, because become'd objects do not follow special rules compared to common GC. It appears that neither do becomeForward'ed objects, nor temp variables not accessible outside their scope, though they could in theory. Cheers, Henry _______________________________________________ Pharo-project mailing list [hidden email] http://lists.gforge.inria.fr/cgi-bin/mailman/listinfo/pharo-project |
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In reply to this post by Mariano Martinez Peck
become: changes the pointer pointing to the objects not the object itself.
So I'm not sure that instance should be changed. If I remember correctly what allinstances does is that it use nextObject to iterate over the object spaces. Stef On Dec 2, 2009, at 10:21 AM, Mariano Martinez Peck wrote: > Hi! Look this peace of code: > > | instance | > instance := TestCase new. > Transcript show: TestCase allInstances size; cr. > instance become: 'aString'. > Transcript show: TestCase allInstances size; cr. > > > The size of TestCase instances is always the same. Although I used become: (and changed to an instance of another class) to one of its instances. > > So, my main question is, is this correct ? Or the message allInstances to TestCase should not take into account the instance I sent the message become: ? > > Thanks in advance. > > Mariano > > _______________________________________________ > Pharo-project mailing list > [hidden email] > http://lists.gforge.inria.fr/cgi-bin/mailman/listinfo/pharo-project _______________________________________________ Pharo-project mailing list [hidden email] http://lists.gforge.inria.fr/cgi-bin/mailman/listinfo/pharo-project |
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#become: swaps the two pointers, so both objects continue to exist.
Use the asymmetric variant #becomeForward: to get rid of an object. And you probably also need a "Smalltalk garbageCollect" to make the object really disappear. Lukas 2009/12/2 Stéphane Ducasse <[hidden email]>: > become: changes the pointer pointing to the objects not the object itself. > So I'm not sure that instance should be changed. > > If I remember correctly what allinstances does is that it use nextObject to > iterate over the object spaces. > > Stef > > On Dec 2, 2009, at 10:21 AM, Mariano Martinez Peck wrote: > >> Hi! Look this peace of code: >> >> | instance | >> instance := TestCase new. >> Transcript show: TestCase allInstances size; cr. >> instance become: 'aString'. >> Transcript show: TestCase allInstances size; cr. >> >> >> The size of TestCase instances is always the same. Although I used become: (and changed to an instance of another class) to one of its instances. >> >> So, my main question is, is this correct ? Or the message allInstances to TestCase should not take into account the instance I sent the message become: ? >> >> Thanks in advance. >> >> Mariano >> >> _______________________________________________ >> Pharo-project mailing list >> [hidden email] >> http://lists.gforge.inria.fr/cgi-bin/mailman/listinfo/pharo-project > > > _______________________________________________ > Pharo-project mailing list > [hidden email] > http://lists.gforge.inria.fr/cgi-bin/mailman/listinfo/pharo-project > -- Lukas Renggli http://www.lukas-renggli.ch _______________________________________________ Pharo-project mailing list [hidden email] http://lists.gforge.inria.fr/cgi-bin/mailman/listinfo/pharo-project |
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Ok, got it. Thanks for all the explanations!
On Wed, Dec 2, 2009 at 12:27 PM, Lukas Renggli <[hidden email]> wrote: #become: swaps the two pointers, so both objects continue to exist. _______________________________________________ Pharo-project mailing list [hidden email] http://lists.gforge.inria.fr/cgi-bin/mailman/listinfo/pharo-project |
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