July 2019 - Pharo-users - lists.pharo.org

Re: [Pharo-users] OrderedCollection as an instance variable

by Marcus Denker

> On 24 Jul 2019, at 17:30, sergio ruiz <sergio.rrd(a)gmail.com> wrote: > > hmmâ¦ > > maybe this is cleaner.. > > tracks > tracks ifNil: [ self tracks: OrderedCollection new ]. > ^ tracks > I write these methods as tracks ^tracks ifNil: [ tracks := OrderedCollection new ]. - one line - does not mix using accusers and not using accessors. Marcus

July 24, 2019

Re: [Pharo-users] OrderedCollection as an instance variable

by Paul DeBruicker

You should change your #tracks method to tracks ^tracks ifNil:[tracks:=OrderedCollection new] or tracks tracks ifNil:[self initializeTracks] ^tracks initializeTracks tracks:=OrderedCollection new. Then you don't have to worry about the implementation of #tracks: changing in the future if you want to do something else with/in it. -- Sent from: http://forum.world.st/Pharo-Smalltalk-Users-f1310670.html

July 24, 2019

Re: [Pharo-users] OrderedCollection as an instance variable

by sergio ruiz

hmmâ¦ maybe this is cleaner.. tracks tracks ifNil: [ self tracks: OrderedCollection new ]. ^ tracks > > > because your #tracks: returns self, not the collection value ---- peace, sergio photographer, journalist, visionary Public Key: http://bit.ly/29z9fG0 #BitMessage BM-NBaswViL21xqgg9STRJjaJaUoyiNe2dV http://www.codeandmusic.com http://www.twitter.com/sergio_101 http://www.facebook.com/sergio101

July 24, 2019

Re: [Pharo-users] OrderedCollection as an instance variable

by sergio ruiz

Oh! how about this: tracks: anObject tracks := anObject. ^ tracks ? > On Jul 24, 2019, at 10:48 AM, Sven Van Caekenberghe <sven(a)stfx.eu> wrote: > > because your #tracks: returns self, not the collection value ---- peace, sergio photographer, journalist, visionary Public Key: http://bit.ly/29z9fG0 #BitMessage BM-NBaswViL21xqgg9STRJjaJaUoyiNe2dV http://www.codeandmusic.com http://www.twitter.com/sergio_101 http://www.facebook.com/sergio101

July 24, 2019

Re: [Pharo-users] P8 regression

by Sven Van Caekenberghe

Can you include the file that you are trying to load ? Also, the stack trace is very short. Are you sure XML parser is ready for Pharo 8 (i.e. are its tests green) ? > On 24 Jul 2019, at 16:59, Hilaire <hilaire(a)drgeo.eu> wrote: > > Hi, > > We have been hit in DrGeo by another regression in Pharo8 (it is not > present in DrGeo versions based on previous Pharo). > > When loading a Sketch with accentuated Latin characters (same occurs > with Chinese but I have so far not enough information to assert it is > the same error) there is a ZnInvalidUTF8 error. > > Attached Pharo8 > > See details https://bugs.launchpad.net/drgeo/+bug/1837745 > > For the record the stream passed to the XML parser (an old version but I > don't think it is the problem) is from readStream message send to > FileReference. > > Do you want a bug ticket? > > Hilaire > > -- > Dr. Geo > http://drgeo.eu > > <PharoDebug.log>

July 24, 2019

P8 regression

by Hilaire

Hi, We have been hit in DrGeo by another regression in Pharo8 (it is not present in DrGeo versions based on previous Pharo). When loading a Sketch with accentuated Latin characters (same occurs with Chinese but I have so far not enough information to assert it is the same error) there is a ZnInvalidUTF8 error. Attached Pharo8 See details https://bugs.launchpad.net/drgeo/+bug/1837745 For the record the stream passed to the XML parser (an old version but I don't think it is the problem) is from readStream message send to FileReference. Do you want a bug ticket? Hilaire -- Dr. Geo http://drgeo.eu

July 24, 2019

Re: [Pharo-users] OrderedCollection as an instance variable

by Sven Van Caekenberghe

because your #tracks: returns self, not the collection value > On 24 Jul 2019, at 16:46, sergio ruiz <sergio.rrd(a)gmail.com> wrote: > > I'm implementing an instance variable as an OrderedCollection, and am doing something idiotic. > > I have an Artist class. > > An Artist can have many tracks: > > tracks > ^ tracks ifNil: [ self tracks: OrderedCollection new ] > > tracks: anObject > tracks := anObject > > Doing something like: > > a := Artist new. > t := Track new. > a tracks add: t > > Gives me the error: > > Artist(Object)>>doesNotUnderstand: #add: > > Once I get past that error, which will evaluate `a tracks`, I can run this. > > I get why it works the second time, but I don't get why it thinks the instance of Artist is the receiver of add: on the first run. > > Thanks! > ---- > peace, > sergio > photographer, journalist, visionary > > Public Key: http://bit.ly/29z9fG0 > #BitMessage BM-NBaswViL21xqgg9STRJjaJaUoyiNe2dV > http://www.codeandmusic.com > http://www.twitter.com/sergio_101 > http://www.facebook.com/sergio101 >

July 24, 2019

OrderedCollection as an instance variable

by sergio ruiz

I'm implementing an instance variable as an OrderedCollection, and am doing something idiotic. I have an Artist class. An Artist can have many tracks: tracks ^ tracks ifNil: [ self tracks: OrderedCollection new ] tracks: anObject tracks := anObject Doing something like: a := Artist new. t := Track new. a tracks add: t Gives me the error: Artist(Object)>>doesNotUnderstand: #add: Once I get past that error, which will evaluate `a tracks`, I can run this. I get why it works the second time, but I don't get why it thinks the instance of Artist is the receiver of add: on the first run. Thanks! ---- peace, sergio photographer, journalist, visionary Public Key: http://bit.ly/29z9fG0 #BitMessage BM-NBaswViL21xqgg9STRJjaJaUoyiNe2dV http://www.codeandmusic.com http://www.twitter.com/sergio_101 http://www.facebook.com/sergio101

July 24, 2019

Re: [Pharo-users] [OrderedCollection] add a reference or a copy?

by sergio ruiz

Okay. This makes the entire universe make more sense. Thanks! > On Jul 24, 2019, at 9:30 AM, Esteban Maringolo <emaringolo(a)gmail.com> wrote: > > Yes, it is the same. Everything is passed by "reference" (*). > And if you copy the collection you'll get two collections referencing > the same object. ---- peace, sergio photographer, journalist, visionary Public Key: http://bit.ly/29z9fG0 #BitMessage BM-NBaswViL21xqgg9STRJjaJaUoyiNe2dV http://www.codeandmusic.com http://www.twitter.com/sergio_101 http://www.facebook.com/sergio101

July 24, 2019

Re: [Pharo-users] [OrderedCollection] add a reference or a copy?

by Esteban Maringolo

Yes, it is the same. Everything is passed by "reference" (*). And if you copy the collection you'll get two collections referencing the same object. E.g. | a c1 c2 | a := Object new. b := OrderedCollection with: a. b identityIncludes: a. "true" c := b copy. c identityIncludes: a. "true" (*) Some objects like SmallIntegers are "immediate" objects, and could be considered that they're passed by value. E.g. 1 copy == 1 "true" Regards, Esteban A. Maringolo On Wed, Jul 24, 2019 at 9:45 AM sergio ruiz <sergio.rrd(a)gmail.com> wrote: > > I think my understanding of OrderedCollections has been incorrect for a very long time. I have never had a situation where it mattered, but in modeling a current project, I think I have been approaching it incorrectly. > > Since I have been using Smalltalk, I assumed that a copy of an object is added to an OrderedCollection. A quick test shows that a reference to that object is added to the OrderedCollection. > > I just wanted a sanity check on this. Is this true with all collections? > > Thanks! > > > ---- > peace, > sergio > photographer, journalist, visionary > > Public Key: http://bit.ly/29z9fG0 > #BitMessage BM-NBaswViL21xqgg9STRJjaJaUoyiNe2dV > http://www.codeandmusic.com > http://www.twitter.com/sergio_101 > http://www.facebook.com/sergio101 >

July 24, 2019