April 2011 - Pharo-users - lists.pharo.org

Re: [Pharo-users] Metacellobrowser feedback

by Dale Henrichs

Johan, Thanks for the excellent feedback ... You have touched on some issues that I am aware of and appreciate your suggestions ... you have also touched on some issues that I hadn't thought about ... I want to let your feedback marinate a bit ... you have provided enough detail that I think I understand where the improvements are needed, but I'm not sure I know the right way to address them ... yet. Please continue to let us know about your learning adventure:) Dale On 04/22/2011 02:36 PM, Johan Fabry wrote: > Hi all, > > I'd like to give a bit of feeback on the metacello browser. First > some context: I am aware of the core concepts of configuration > management, but because of lack of time I never got to learn > Metacello. So I thought this browser would be ideal for me, I gave it > a go, and I'd like to report on my experience. > > The first try did not work at all for me, because I started with a > configuration that is too complex. So lets start with the second try, > something simpler, and first get that sorted out before we do the > complex one. Here we go: I have a SqueakSource project > TraitsApplication with one package TraitsApplication which contains > TraitsApplication and TraitsApplication-Tests categories (and the > former contains a TraitsApplication class :-P ). Following the > prompts in the browser I was able to make a configuration and save it > to SqueakSource, without any real problems. So the cool thing is, I > made my first Metacello config today and it even works :-) > > One issue is how to load my creation. I am used to a big do-it that > gets the config via Gofer and contains '(Smalltalk at: > #ConfigurationOfFoo) perform: #loadDefault'. Many configs do it like > this, as a user I considered it a standard convention. But this turns > out not to work, because no loadDefault has been defined. Perchance I > remembered how I had to load MetacelloBrowser > '(ConfigurationOfMetacelloBrowser project version: #stable) load' and > adapting it to TraitsApplication (not forgetting > version:#development) made it to work. So, the question: why is there > no #loadDefault generated, nor an obvious way to specify what the > default should be? (At least for simple cases of the configuration, > like this one) > > The second issue is the UI. It is confusing at times, there are > multiple issues and I list them in random order - Why can I not click > on '+Configuration' when there is no configuration selected in the > left hand side? - What do the unit-test icons at the left of the > configs and baselines-versions-... mean? I turn them green by > double-clicking on them, which also gets me an inspector on an empty > collection. Huh? - The context menu is too big and confusing. It > should be subdivided and ordered by group. Submenus are in order I > think. - What are groups? The help menu does not enlighten me. > > Next up: making a config for AspectMaps (the first thing I tried and > that did not work). But this is for another day ... -- Johan Fabry > jfabry(a)dcc.uchile.cl - http://dcc.uchile.cl/~jfabry PLEIAD Lab - > Computer Science Department (DCC) - University of Chile > > >

April 22, 2011

Re: [Pharo-users] How to break out of endless loop using code?

by Dale Henrichs

Try something like this: | process | process := [ x := MyClass2 new. x myLoop ] fork. (Delay forSeconds: 10) wait. process terminate. With #fork, you are running the loop in a background process. #fork returns the process instance. Wait a bit using Delay and then send #terminate to the process ... If you stash `process` into a global you can let it run away while you do work in the foreground. Depending upon how tight the loop is, you may need to put in a `Processor yield` statement to give the foreground process a chance to run ... you should also look into process priorities. Dale On 04/21/2011 01:08 PM, DougEdmunds wrote: > I created a class that generates an endless loop. For this example, the loop > just prints 1-10, back and forth. I'd like to stop the loop by using code, > but when it is running, I can't type anything in a workspace. The only way > I can stop it is by a manual interrupt (on XP, using Alt-<period key>) > > Typical run: > x := MyClass2 new. > x myLoop. > > I want to type "x stopLoop" which would set the running variable to false. > > How do I do this? > > -------- > > 'From Pharo1.3a of ''18 January 2011'' [Latest update: #13144] on 21 April > 2011 at 12:59:14 pm'! > Object subclass: #MyClass2 > instanceVariableNames: 'running' > classVariableNames: '' > poolDictionaries: '' > category: 'Sandbox0419'! > > !MyClass2 methodsFor: 'as yet unclassified' stamp: 'DougEdmunds 4/21/2011 > 12:54'! > initialize > super initialize. > running := true. > Transcript clear. > Transcript show: 'try to stop the loop somehow' . > ! ! > > !MyClass2 methodsFor: 'as yet unclassified' stamp: 'DougEdmunds 4/21/2011 > 12:54'! > myLoop > > "running is an instance variable, initialized to true." > > | x up | > Transcript clear. > x := 1. > up := true. > [Transcript show: x; cr. > x>= 10 ifTrue: [up :=false]. > x<= 1 ifTrue: [up := true]. > up ifTrue: [x := x + 1] ifFalse: [x := x - 1]. > (Delay forSeconds: 1) wait. > running ifFalse: [^ x]. > ] repeat. > ! ! > > !MyClass2 methodsFor: 'as yet unclassified' stamp: 'DougEdmunds 4/21/2011 > 12:55'! > stopLoop > running := false. > ! ! > -------- > > -- > View this message in context: http://forum.world.st/How-to-break-out-of-endless-loop-using-code-tp3466747… > Sent from the Pharo Smalltalk Users mailing list archive at Nabble.com. >

April 21, 2011

Re: [Pharo-users] ++ -- again

by Ted F.A. van Gaalen

'dnanietiM izeÃ¼rG' asSchweizerString reversed, '!' O dear, I've really stirred up++ things :o) Coincidently I, was in Helvetiae today, 110 km from where I currently live (Ravensburg) near Appenzell, had an unprepared ascend++ from Wasserau to the higher Seealpsee. So beautiful. Lungs bursting, heart pumping. but now i feel good! Get away from those screens from time to time! New for me: Looked up Helvetia in a bird's eye view. thanks. Will read more there too. How far does one go? I do like the SQL extension though. Not that I am important or so, far from it, but you can read more about me on linkedIn. I am trying to switch from many other languages/systems to Smalltalk, with the goal of finding a job where I can use it sooner better than later. I did often mainframe (PL/1, Cobol, DB2) projects with the same kind of fun as someone working on old locomotives on a historic railway. I have made my CV as a Seaside Smalltalk app, could put it in a Monticello package and would like to ask you to take a look at it and tell me how I am doing? If so: but where to place the .mcz? it contains a html tree as well. The idea is to put it on a Seaside server for everyone to see.(especially those who could employ me, as i am currently without work) There will be more than just the CV, e.g. UML diagrams and a technical description. Thanks. Won't write so much off topic next time, sorry :o) On Thu, Apr 21, 2011 at 7:19 PM, Igor Stasenko <siguctua(a)gmail.com> wrote: > On 21 April 2011 18:06, Lukas Renggli <renggli(a)gmail.com> wrote: >>> So, what is your point? >> >> To prove your (quoted) sentence wrong: "And it works only for numbers >> (no pointers >> in smalltalk) and so, completely falls out of object model." >> > > Sure it is. Unless you turn it into message send with trick which you > described above. > But then it become even worse from performance point of view, because > of use of block closure for doing simple increment. > > so, people will be punished from using > > i++ > > instead of > > i := i + 1 > > which i finding amusing :) > > > -- > Best regards, > Igor Stasenko AKA sig. > >

April 21, 2011

Re: [Pharo-users] How to break out of endless loop using code?

by Mariano Martinez Peck

On Thu, Apr 21, 2011 at 10:08 PM, DougEdmunds <dougedmunds(a)gmail.com> wrote: > I created a class that generates an endless loop. For this example, the > loop > just prints 1-10, back and forth. I'd like to stop the loop by using code, > but when it is running, I can't type anything in a workspace. The only way > I can stop it is by a manual interrupt (on XP, using Alt-<period key>) > > I have no idea how to do it. But all I know is that no matter whether you use a UI or type something manually, at the end everything is an object + message send. So..what I am saying is that you can check what the interruption keys does and do it by code or take the idea and do something similar. Check UserInterruptHandler, its users, etc... Cheers Mariano BTW if you find it, let us know > Typical run: > x := MyClass2 new. > x myLoop. > > I want to type "x stopLoop" which would set the running variable to false. > > How do I do this? > > -------- > > 'From Pharo1.3a of ''18 January 2011'' [Latest update: #13144] on 21 April > 2011 at 12:59:14 pm'! > Object subclass: #MyClass2 > instanceVariableNames: 'running' > classVariableNames: '' > poolDictionaries: '' > category: 'Sandbox0419'! > > !MyClass2 methodsFor: 'as yet unclassified' stamp: 'DougEdmunds 4/21/2011 > 12:54'! > initialize > super initialize. > running := true. > Transcript clear. > Transcript show: 'try to stop the loop somehow' . > ! ! > > !MyClass2 methodsFor: 'as yet unclassified' stamp: 'DougEdmunds 4/21/2011 > 12:54'! > myLoop > > "running is an instance variable, initialized to true." > > | x up | > Transcript clear. > x := 1. > up := true. > [Transcript show: x; cr. > x >= 10 ifTrue: [up :=false]. > x <= 1 ifTrue: [up := true]. > up ifTrue: [x := x + 1] ifFalse: [x := x - 1]. > (Delay forSeconds: 1) wait. > running ifFalse: [^ x]. > ] repeat. > ! ! > > !MyClass2 methodsFor: 'as yet unclassified' stamp: 'DougEdmunds 4/21/2011 > 12:55'! > stopLoop > running := false. > ! ! > -------- > > -- > View this message in context: > http://forum.world.st/How-to-break-out-of-endless-loop-using-code-tp3466747… > Sent from the Pharo Smalltalk Users mailing list archive at Nabble.com. > > -- Mariano http://marianopeck.wordpress.com

April 21, 2011

Re: [Pharo-users] How to break out of endless loop using code?

by Alain_Rastoul

Hi Doug, If you run your code in a workspace with 'do-it' command, it runs in the UI smalltalk process and the only way to cancel it is the cancel key You shoud run your code in a separate process like: x := MyClass2 new [x myLoop ] forkAt: Processor systemBackgroundPriority. forkAt:... forks the block in another smalltalk process. like this you will be able to tell your x object to stop looping from your workspace (by setting a boolean in your object's member), or you could terminate it or debug it with the Process browser. HTH, Cheers Alain "DougEdmunds" <dougedmunds(a)gmail.com> a Ã©crit dans le message de news: 1303416534118-3466747.post(a)n4.nabble.com... >I created a class that generates an endless loop. For this example, the >loop > just prints 1-10, back and forth. I'd like to stop the loop by using code, > but when it is running, I can't type anything in a workspace. The only > way > I can stop it is by a manual interrupt (on XP, using Alt-<period key>) > > Typical run: > x := MyClass2 new. > x myLoop. > > I want to type "x stopLoop" which would set the running variable to false. > > How do I do this? > > -------- > > 'From Pharo1.3a of ''18 January 2011'' [Latest update: #13144] on 21 April > 2011 at 12:59:14 pm'! > Object subclass: #MyClass2 > instanceVariableNames: 'running' > classVariableNames: '' > poolDictionaries: '' > category: 'Sandbox0419'! > > !MyClass2 methodsFor: 'as yet unclassified' stamp: 'DougEdmunds 4/21/2011 > 12:54'! > initialize > super initialize. > running := true. > Transcript clear. > Transcript show: 'try to stop the loop somehow' . > ! ! > > !MyClass2 methodsFor: 'as yet unclassified' stamp: 'DougEdmunds 4/21/2011 > 12:54'! > myLoop > > "running is an instance variable, initialized to true." > > | x up | > Transcript clear. > x := 1. > up := true. > [Transcript show: x; cr. > x >= 10 ifTrue: [up :=false]. > x <= 1 ifTrue: [up := true]. > up ifTrue: [x := x + 1] ifFalse: [x := x - 1]. > (Delay forSeconds: 1) wait. > running ifFalse: [^ x]. > ] repeat. > ! ! > > !MyClass2 methodsFor: 'as yet unclassified' stamp: 'DougEdmunds 4/21/2011 > 12:55'! > stopLoop > running := false. > ! ! > -------- > > -- > View this message in context: > http://forum.world.st/How-to-break-out-of-endless-loop-using-code-tp3466747… > Sent from the Pharo Smalltalk Users mailing list archive at Nabble.com. > >

April 21, 2011

Re: [Pharo-users] How to break out of endless loop using code?

by StÃ©phane Ducasse

using different process and having synchronisation point to communicate with it? Stef On Apr 21, 2011, at 10:08 PM, DougEdmunds wrote: > I created a class that generates an endless loop. For this example, the loop > just prints 1-10, back and forth. I'd like to stop the loop by using code, > but when it is running, I can't type anything in a workspace. The only way > I can stop it is by a manual interrupt (on XP, using Alt-<period key>) > > Typical run: > x := MyClass2 new. > x myLoop. > > I want to type "x stopLoop" which would set the running variable to false. > > How do I do this? > > -------- > > 'From Pharo1.3a of ''18 January 2011'' [Latest update: #13144] on 21 April > 2011 at 12:59:14 pm'! > Object subclass: #MyClass2 > instanceVariableNames: 'running' > classVariableNames: '' > poolDictionaries: '' > category: 'Sandbox0419'! > > !MyClass2 methodsFor: 'as yet unclassified' stamp: 'DougEdmunds 4/21/2011 > 12:54'! > initialize > super initialize. > running := true. > Transcript clear. > Transcript show: 'try to stop the loop somehow' . > ! ! > > !MyClass2 methodsFor: 'as yet unclassified' stamp: 'DougEdmunds 4/21/2011 > 12:54'! > myLoop > > "running is an instance variable, initialized to true." > > | x up | > Transcript clear. > x := 1. > up := true. > [Transcript show: x; cr. > x >= 10 ifTrue: [up :=false]. > x <= 1 ifTrue: [up := true]. > up ifTrue: [x := x + 1] ifFalse: [x := x - 1]. > (Delay forSeconds: 1) wait. > running ifFalse: [^ x]. > ] repeat. > ! ! > > !MyClass2 methodsFor: 'as yet unclassified' stamp: 'DougEdmunds 4/21/2011 > 12:55'! > stopLoop > running := false. > ! ! > -------- > > -- > View this message in context: http://forum.world.st/How-to-break-out-of-endless-loop-using-code-tp3466747… > Sent from the Pharo Smalltalk Users mailing list archive at Nabble.com. >

April 21, 2011

How to break out of endless loop using code?

by DougEdmunds

I created a class that generates an endless loop. For this example, the loop just prints 1-10, back and forth. I'd like to stop the loop by using code, but when it is running, I can't type anything in a workspace. The only way I can stop it is by a manual interrupt (on XP, using Alt-<period key>) Typical run: x := MyClass2 new. x myLoop. I want to type "x stopLoop" which would set the running variable to false. How do I do this? -------- 'From Pharo1.3a of ''18 January 2011'' [Latest update: #13144] on 21 April 2011 at 12:59:14 pm'! Object subclass: #MyClass2 instanceVariableNames: 'running' classVariableNames: '' poolDictionaries: '' category: 'Sandbox0419'! !MyClass2 methodsFor: 'as yet unclassified' stamp: 'DougEdmunds 4/21/2011 12:54'! initialize super initialize. running := true. Transcript clear. Transcript show: 'try to stop the loop somehow' . ! ! !MyClass2 methodsFor: 'as yet unclassified' stamp: 'DougEdmunds 4/21/2011 12:54'! myLoop "running is an instance variable, initialized to true." | x up | Transcript clear. x := 1. up := true. [Transcript show: x; cr. x >= 10 ifTrue: [up :=false]. x <= 1 ifTrue: [up := true]. up ifTrue: [x := x + 1] ifFalse: [x := x - 1]. (Delay forSeconds: 1) wait. running ifFalse: [^ x]. ] repeat. ! ! !MyClass2 methodsFor: 'as yet unclassified' stamp: 'DougEdmunds 4/21/2011 12:55'! stopLoop running := false. ! ! -------- -- View this message in context: http://forum.world.st/How-to-break-out-of-endless-loop-using-code-tp3466747… Sent from the Pharo Smalltalk Users mailing list archive at Nabble.com.

April 21, 2011

[COTDC] 53 - AnimatedGIFReadWriter

by laurent laffont

Today: AnimatedGIFReadWriter Comment Of The Day Contest - One Day One Comment Rules: #1: Each day a not commented class is elected. Each day the best comment will be integrated with name of the author(s). #2: If you cannot comment it, deprecate it. Results: http://code.google.com/p/pharo/wiki/CommentOfTheDayContest Laurent Laffont - @lolgzs <http://twitter.com/#!/lolgzs> Pharo Smalltalk Screencasts: http://www.pharocasts.com/ Blog: http://magaloma.blogspot.com/ Developer group: http://cara74.seasidehosting.st

April 21, 2011

Re: [Pharo-users] [Pharo-project] [COTDC] 52 - PCXReadWriter

by laurent laffont

http://code.google.com/p/pharo/issues/detail?id=4072 Thanks Guillermo. Laurent. On Thu, Apr 21, 2011 at 10:40 AM, StÃ©phane Ducasse < stephane.ducasse(a)inria.fr> wrote: > open a bug entry and put your fix :) > > Stef > > On Apr 21, 2011, at 1:05 AM, Guillermo Polito wrote: > > > I am an Image ReadWriter supposed to be in charge of PCX file encoding > and decoding. > > > > Actually, as my instances does not implement understandsImageFormat, they > use the default ^false implementation and I cannot be used. > > I don't have uses in the image also :). > > > > But in case I am fixed, the code to open a morph with a pcx image is: > > > > PCXReadWriter formFromFileNamed: 'anImage.pcx'. > > > > > > ;) > > Guille > > > > On Wed, Apr 20, 2011 at 3:17 PM, laurent laffont < > laurent.laffont(a)gmail.com> wrote: > > Today: PCXReadWriter > > > > > > Comment Of The Day Contest - One Day One Comment > > Rules: > > #1: Each day a not commented class is elected. Each day the best comment > will be integrated with name of the author(s). > > #2: If you cannot comment it, deprecate it. > > Results: http://code.google.com/p/pharo/wiki/CommentOfTheDayContest > > > > Laurent > > > > >

April 21, 2011

Re: [Pharo-users] ++ -- again

by Igor Stasenko

On 21 April 2011 18:06, Lukas Renggli <renggli(a)gmail.com> wrote: >> So, what is your point? > > To prove your (quoted) sentence wrong: "And it works only for numbers > (no pointers > in smalltalk) and so, completely falls out of object model." > Sure it is. Unless you turn it into message send with trick which you described above. But then it become even worse from performance point of view, because of use of block closure for doing simple increment. so, people will be punished from using i++ instead of i := i + 1 which i finding amusing :) -- Best regards, Igor Stasenko AKA sig.

April 21, 2011

Re: [Pharo-users] ++ -- again

by Lukas Renggli

> So, what is your point? To prove your (quoted) sentence wrong: "And it works only for numbers (no pointers in smalltalk) and so, completely falls out of object model." Lukas -- Lukas Renggli www.lukas-renggli.ch

April 21, 2011

Re: [Pharo-users] ++ -- again

by Igor Stasenko

On 21 April 2011 17:37, Lukas Renggli <renggli(a)gmail.com> wrote: >> A ++ operator is evil, because you cannot override or redefine it >> (like any other message). > > In C++ you can. > yep.. been there >> And it works only for numbers (no pointers >> in smalltalk) >> and so, completely falls out of object model. > > It can be done and has been done in Helvetia without falling out of > the object model. > > I don't remember the details, but I was essentially rewriting > > Â Â i++ > > to something along > > Â Â i increment: [ :v | i := v ] > > where you the semantics of #increment: are implemented in the objects > as you wish. For numbers this would be something like: > > Â Â Number>>#increment: aBlock > Â Â Â Â ^ aBlock value: self + 1 > > For other objects other 'meaningful' implementations can be added, for example: > > Â Â SequenceableCollection>>#increment: aBlock > Â Â Â Â ^ aBlock value: self allButFirst , (Array with: self first) > > Â Â Stream>>#increment: aBlock > Â Â Â Â ^ aStream skip: 1 > > Â Â etc. > So, what is your point? Yes, we can extend a syntax. And with Helvetia this is piece of cake. The question - do we need it so much that want to sacrifice a syntax simplicity, consistency and clarity for that? (outside of serving as an example of extending syntax ;) Well, yeah, we can introduce weird stuff at any moment. Things like macros or quasi-quotes will eventually turn once self-explanatory smalltalk code into DSL, where only author can understand what it does... I am fine with having DSLs around with any possible extensions that people may want them to be. But making it to be default syntax? Hell no! -- Best regards, Igor Stasenko AKA sig.

April 21, 2011

Re: [Pharo-users] ++ -- again

by Lukas Renggli

> A ++ operator is evil, because you cannot override or redefine it > (like any other message). In C++ you can. > And it works only for numbers (no pointers > in smalltalk) > and so, completely falls out of object model. It can be done and has been done in Helvetia without falling out of the object model. I don't remember the details, but I was essentially rewriting i++ to something along i increment: [ :v | i := v ] where you the semantics of #increment: are implemented in the objects as you wish. For numbers this would be something like: Number>>#increment: aBlock ^ aBlock value: self + 1 For other objects other 'meaningful' implementations can be added, for example: SequenceableCollection>>#increment: aBlock ^ aBlock value: self allButFirst , (Array with: self first) Stream>>#increment: aBlock ^ aStream skip: 1 etc. Cheers, Lukas -- Lukas Renggli www.lukas-renggli.ch

April 21, 2011

Re: [Pharo-users] [COTDC] 52 - PCXReadWriter

by StÃ©phane Ducasse

open a bug entry and put your fix :) Stef On Apr 21, 2011, at 1:05 AM, Guillermo Polito wrote: > I am an Image ReadWriter supposed to be in charge of PCX file encoding and decoding. > > Actually, as my instances does not implement understandsImageFormat, they use the default ^false implementation and I cannot be used. > I don't have uses in the image also :). > > But in case I am fixed, the code to open a morph with a pcx image is: > > PCXReadWriter formFromFileNamed: 'anImage.pcx'. > > > ;) > Guille > > On Wed, Apr 20, 2011 at 3:17 PM, laurent laffont <laurent.laffont(a)gmail.com> wrote: > Today: PCXReadWriter > > > Comment Of The Day Contest - One Day One Comment > Rules: > #1: Each day a not commented class is elected. Each day the best comment will be integrated with name of the author(s). > #2: If you cannot comment it, deprecate it. > Results: http://code.google.com/p/pharo/wiki/CommentOfTheDayContest > > Laurent >

April 21, 2011

Re: [Pharo-users] ++ -- again

by Igor Stasenko

On 21 April 2011 07:58, Tobias Pape <Das.Linux(a)gmx.de> wrote: > > Am 2011-04-20 um 22:18 schrieb Ted F.A. van Gaalen: > >> Thanks Tobias and Igor for your thoughts about this increment/decrement theme. >> @Tobias: what kind of side effect(s) are you talking about? I don't >> understand, sorry. > > No problem, I wrote a bit complicated. > What I mean is that > Â Â Â Â i++ > instructs the object âiâ to change its state, ie, increment > itself. > However, the Object in âiâ is meant to be an > integer. So, how to interpret that? say, âiâ is 5. > Essentially, > Â Â Â Â i++ > says > Â Â Â Â âfive, change your state to be sixâ > But that would imply, because all integers are the respecive same > over the image, that all fives are suddenly sixes. > > The point is, > in C, variables denote memory cells, and it is a common > operation to say âmemory cell, increment your content by oneâ, > whereas in Smalltalk, a variable denotes an object and > such an increment is rather senseless on integer objects. > > In other words, each integer in a Smalltalk image is > a kind of Singleton. > ( Â Â Â as > Â Â Â Â 1 = 1 " => true" > Â Â Â Â 1 == 1 " => true" > ) > Hence, > | a b | > a := 1. > b := 1. > a = b " => true (a and b have the same content)". > a == b "=> true (ie, they are the indentical object)". > > "but" > > a ++. "hypothetical" > a = b "=> ??, probably false". > a == b " => ??, can't think of that". > yes, because variables in smalltalk are references to objects. and variables in C are memory pointers. A ++ operator is evil, because you cannot override or redefine it (like any other message). And it works only for numbers (no pointers in smalltalk) and so, completely falls out of object model. > > So Long, > Â Â Â Â -Tobias > -- Best regards, Igor Stasenko AKA sig.

April 21, 2011

Re: [Pharo-users] ++ -- again

by Tobias Pape

Am 2011-04-20 um 22:18 schrieb Ted F.A. van Gaalen: > Thanks Tobias and Igor for your thoughts about this increment/decrement theme. > @Tobias: what kind of side effect(s) are you talking about? I don't > understand, sorry. No problem, I wrote a bit complicated. What I mean is that i++ instructs the object âiâ to change its state, ie, increment itself. However, the Object in âiâ is meant to be an integer. So, how to interpret that? say, âiâ is 5. Essentially, i++ says âfive, change your state to be sixâ But that would imply, because all integers are the respecive same over the image, that all fives are suddenly sixes. The point is, in C, variables denote memory cells, and it is a common operation to say âmemory cell, increment your content by oneâ, whereas in Smalltalk, a variable denotes an object and such an increment is rather senseless on integer objects. In other words, each integer in a Smalltalk image is a kind of Singleton. ( as 1 = 1 " => true" 1 == 1 " => true" ) Hence, | a b | a := 1. b := 1. a = b " => true (a and b have the same content)". a == b "=> true (ie, they are the indentical object)". "but" a ++. "hypothetical" a = b "=> ??, probably false". a == b " => ??, can't think of that". So Long, -Tobias

April 21, 2011

Re: [Pharo-users] ++ -- again

by Igor Stasenko

On 20 April 2011 23:18, Ted F.A. van Gaalen <tedvga(a)gmail.com> wrote: > Thanks Tobias and Igor for your thoughts about this increment/decrement theme. > @Tobias: what kind of side effect(s) are you talking about? I don't > understand, sorry. > > @Igor, Yes, I completely agree with you that Smalltalk should not > transform to a C++ like dialect. Â At first, I simply would like wanted > ++ -- (monadic) and for that matter also += -= Â *= and /= Â (dyadic) as > messages for the Integer classes, possibly as primitive methods. > > But then again, If this would be implemented, I can imagine people > using ugly and hard to read statement trains like > anotherInt += anInt ++ * 1234 , > I don't find these constructs very nice either.. So, after realizing > this.. perhaps you're right: just let it be. Â (probably would have > needed here () as wel) Yes. As to me it is simply not worth to dedicate a special operator for increment or decrement. It makes no sense, considering how many other operators you could imagine, and considering how often you using value increment in smalltalk. If you do things right, you don't need to write it by yourself , because it is done once in #to:do: and/or #do: loops. So, it is really very small number of use cases where you may need to use increment or decrement. Unlike from C, where you will use ++ or -- on almost every loop , in smalltalk for loops you using collections and closures, incread of manually writing them again and again. -- Best regards, Igor Stasenko AKA sig.

April 21, 2011

Re: [Pharo-users] [COTDC] 52 - PCXReadWriter

by Guillermo Polito

I am an Image ReadWriter supposed to be in charge of PCX file encoding and decoding. Actually, as my instances does not implement understandsImageFormat, they use the default ^false implementation and I cannot be used. I don't have uses in the image also :). But in case I am fixed, the code to open a morph with a pcx image is: PCXReadWriter formFromFileNamed: 'anImage.pcx'. ;) Guille On Wed, Apr 20, 2011 at 3:17 PM, laurent laffont <laurent.laffont(a)gmail.com>wrote: > Today: PCXReadWriter > > > Comment Of The Day Contest - One Day One Comment > Rules: > #1: Each day a not commented class is elected. Each day the best comment > will be integrated with name of the author(s). > #2: If you cannot comment it, deprecate it. > Results: http://code.google.com/p/pharo/wiki/CommentOfTheDayContest > > Laurent >

April 20, 2011

Re: [Pharo-users] Pharo-users Digest, Vol 16, Issue 31

by Anthony Romo

On Tue, Apr 19, 2011 at 4:05 AM, <pharo-users-request(a)lists.gforge.inria.fr>wrote: > Send Pharo-users mailing list submissions to > pharo-users(a)lists.gforge.inria.fr > > To subscribe or unsubscribe via the World Wide Web, visit > http://lists.gforge.inria.fr/cgi-bin/mailman/listinfo/pharo-users > or, via email, send a message with subject or body 'help' to > pharo-users-request(a)lists.gforge.inria.fr > > You can reach the person managing the list at > pharo-users-owner(a)lists.gforge.inria.fr > > When replying, please edit your Subject line so it is more specific > than "Re: Contents of Pharo-users digest..." > > > Today's Topics: > > 1. Re: [ANN] new mailinglist for tracker mails (Igor Stasenko) > 2. Re: [ANN] new mailinglist for tracker mails (Marcus Denker) > 3. Request for mentor(s) within Pharos community (Anthony Romo) > 4. Re: Request for mentor(s) within Pharos community > (St?phane Ducasse) > > > ---------------------------------------------------------------------- > > Message: 1 > Date: Mon, 18 Apr 2011 13:08:22 +0200 > From: Igor Stasenko <siguctua(a)gmail.com> > Subject: Re: [Pharo-users] [ANN] new mailinglist for tracker mails > To: A friendly place where any question about pharo is welcome > <pharo-users(a)lists.gforge.inria.fr> > Message-ID: <BANLkTik+AJv4QxMX3oPMP9saJicHiBf5=A(a)mail.gmail.com> > Content-Type: text/plain; charset=UTF-8 > > On 18 April 2011 08:23, Marcus Denker <marcus.denker(a)inria.fr> wrote: > > > > The mails from the google tracker now go to this list: > > > > ? ? ? ? > http://lists.gforge.inria.fr/cgi-bin/mailman/listinfo/pharo-bugtracker > > > > in turn, this means the traffic on the pharo-project list should be a bit > more managable. > > > > Err > > Which language do you prefer to display your messages? Fran?ais > > I prefer english, but there is no option how i could change that. > :( > > > ? ? ? ?Marcus > > > > > > -- > > Marcus Denker ?-- http://www.marcusdenker.de > > INRIA Lille -- Nord Europe. Team RMoD. > > > > > > > > > > -- > Best regards, > Igor Stasenko AKA sig. > > > > ------------------------------ > > Message: 2 > Date: Mon, 18 Apr 2011 13:16:02 +0200 > From: Marcus Denker <marcus.denker(a)inria.fr> > Subject: Re: [Pharo-users] [ANN] new mailinglist for tracker mails > To: A friendly place where any question about pharo is welcome > <pharo-users(a)lists.gforge.inria.fr> > Message-ID: <C6ED0C16-1999-48C6-A2D4-8AE12B34E0B0(a)inria.fr> > Content-Type: text/plain; charset=iso-8859-1 > > > On Apr 18, 2011, at 1:08 PM, Igor Stasenko wrote: > > > On 18 April 2011 08:23, Marcus Denker <marcus.denker(a)inria.fr> wrote: > >> > >> The mails from the google tracker now go to this list: > >> > >> > http://lists.gforge.inria.fr/cgi-bin/mailman/listinfo/pharo-bugtracker > >> > >> in turn, this means the traffic on the pharo-project list should be a > bit more managable. > >> > > > > Err > > > > Which language do you prefer to display your messages? Fran?ais > > > > I prefer english, but there is no option how i could change that. > > :( > > > This is good for learning. :-) > > But I changed it. > > Marcus > > -- > Marcus Denker -- http://www.marcusdenker.de > INRIA Lille -- Nord Europe. Team RMoD. > > > > > ------------------------------ > > Message: 3 > Date: Mon, 18 Apr 2011 17:31:27 -0600 > From: Anthony Romo <romo.alromo.anthony73(a)gmail.com> > Subject: [Pharo-users] Request for mentor(s) within Pharos community > To: pharo-users(a)lists.gforge.inria.fr > Message-ID: <BANLkTinUh6XqrGz=DYw4uguNV031D1SG4Q(a)mail.gmail.com> > Content-Type: text/plain; charset="iso-8859-1" > > Today I joined the pharo-users mailing list. I am a masters degree > candidate in software design. I would appreciate an email from member(s) > of > the community that would be willing to communicate with me and give me a > quick start as to how best to participate in the community. >

April 20, 2011

++ -- again

by Ted F.A. van Gaalen

Thanks Tobias and Igor for your thoughts about this increment/decrement theme. @Tobias: what kind of side effect(s) are you talking about? I don't understand, sorry. @Igor, Yes, I completely agree with you that Smalltalk should not transform to a C++ like dialect. At first, I simply would like wanted ++ -- (monadic) and for that matter also += -= *= and /= (dyadic) as messages for the Integer classes, possibly as primitive methods. But then again, If this would be implemented, I can imagine people using ugly and hard to read statement trains like anotherInt += anInt ++ * 1234 , I don't find these constructs very nice either.. So, after realizing this.. perhaps you're right: just let it be. (probably would have needed here () as wel) Greetings from Ravensburg area TedvG

April 20, 2011

[COTDC] 52 - PCXReadWriter

by laurent laffont

Today: PCXReadWriter Comment Of The Day Contest - One Day One Comment Rules: #1: Each day a not commented class is elected. Each day the best comment will be integrated with name of the author(s). #2: If you cannot comment it, deprecate it. Results: http://code.google.com/p/pharo/wiki/CommentOfTheDayContest Laurent

April 20, 2011

Re: [Pharo-users] [ANN] Magma 1.2

by Mariano Martinez Peck

Thanks Chris for all your effort. I think Magma is a real needed product. On Wed, Apr 20, 2011 at 7:10 AM, Elliot Finley <efinley.lists(a)gmail.com>wrote: > On Tue, Apr 19, 2011 at 4:08 PM, Chris Muller <asqueaker(a)gmail.com> wrote: > > Magma 1.2 is now finally released for Squeak 4.2, Pharo 1.1 and Pharo > > 1.2. This new release offers improved performance thanks to > > minimizing the problem associated with finalization, as well as > > avoiding Squeak's slow become except once every 30 seconds. See > > Much thanks for this and especially for the improved documentation. > > Elliot > _______________________________________________ > Magma mailing list > Magma(a)lists.squeakfoundation.org > http://lists.squeakfoundation.org/mailman/listinfo/magma > -- Mariano http://marianopeck.wordpress.com

April 20, 2011

PharoCasts: Test coverage with Hapao

by laurent laffont

Vanessa and Alexandre show us Hapao, an innovative test coverage tool implemented in the Pharo Smalltalk programming language. You will see how they analyse the ProfStef interactive tutorial, increase test coverage and commit their contribution to SqueakSource. http://www.pharocasts.com/2011/04/test-coverage-with-hapao.html -- Laurent Laffont - @lolgzs Pharo Smalltalk Screencasts: http://www.pharocasts.com/ Blog: http://magaloma.blogspot.com/ Developer group: http://cara74.seasidehosting.st

April 20, 2011

Re: [Pharo-users] [COTDC] 51 - TestCaseAnnouncement

by Sven Van Caekenberghe

On 19 Apr 2011, at 21:22, laurent laffont wrote: > Today: TestCaseAnnouncement > > > Comment Of The Day Contest - One Day One Comment > Rules: > #1: Each day a not commented class is elected. Each day the best comment will be integrated with name of the author(s). > #2: If you cannot comment it, deprecate it. > Results: http://code.google.com/p/pharo/wiki/CommentOfTheDayContest > > Laurent --- I am TestCaseAnnouncement, an Announcement regarding the execution of TestCases. I know the TestCase, the test method selector and the TestResult I am announcing about. --- I am TestCaseStarted, a TestCaseAnnouncement indicating that a unit test will be run. --- I am TestCaseEnded, a TestCaseAnnouncement indicating that a unit test has run. ---

April 19, 2011

[COTDC] 51 - TestCaseAnnouncement

by laurent laffont

Today: TestCaseAnnouncement Comment Of The Day Contest - One Day One Comment Rules: #1: Each day a not commented class is elected. Each day the best comment will be integrated with name of the author(s). #2: If you cannot comment it, deprecate it. Results: http://code.google.com/p/pharo/wiki/CommentOfTheDayContest Laurent

April 19, 2011