February 2015 - Pharo-dev - lists.pharo.org

[NativeBoost] Calling a function in a struct

by Max Leske

Hi. I have a situation with libgit2 where the function I need to call is a field in a struct (the field gets populated with different functions with the same signature depending on certain conditions). Iâm facing two problems now: 1. how do I define a function as the field type of an NBExternalStructure? 2. how can I call the function? Iâve tried using callbacks as field types. That works as far as I can access the functions by pointer. But how would I then call that function? Iâve looked at NBNativeFunction and NBNativeFunctionGen but I canât see how I should use either of those to make a plain call. Hereâs a more precise description of my problem: writepack := LG2GitOdbWritepackS new. â¦ âinitialize the struct externallyâ ânow call the function âcommitâ and pass the arguments (this is how I imagine it could workâ¦)" writepack commit value: writepack value: anotherStruct. Needed struct fields: backend: git_odb_backend * append: int (*)(git_odb_writepack *, const void *, size_t, git_transfer_progress *) commit: int (*)(git_odb_writepack *, git_transfer_progress *) free: void (*)(git_odb_writepack *) My current (ad hoc) struct fields: fieldsDesc ^#( LG2GitOdbO backend; LG2WritePackAppendCb append; LG2WritePackCommitCb commit; LG2WritePackFreeCb free; ) Iâd even be happy if I have to implement a method on LG2GitOdbWritepackS for every function call (e.g. âwritepack commit: arg1 and: arg2â) but how would I make the call? Any ideas? Max

Feb. 21, 2015

Re: [Pharo-dev] Why was #asLegalSelector removed?

by stepharo

Le 20/2/15 15:59, Sean P. DeNigris a Ã©crit : > As you know, I love cleaning ;) > > But... > > > stepharo wrote >> https://github.com/pharo-project/pharo-workingRoadmaps/blob/master/StringCl… > What enlightenment am I supposed to gain from "candidates for removal... > asLegalSelector", and later "Done: candidates for removal... > asLegalSelector". I still understand nothing of the rationale. Yes we are poor are documenting such decision. But if to remove a bad method it takes 5 times more energy than removing it then we will never make progress. >> This code is bogus and shitty. > And useful ;) (as evidenced by this thread). Okay, it's limited, but what's > better - having users roll their own every time? Probably and I'm not provocating. > > For now, I'll package it with my code, but I think we should add it back, > maybe with a method comment to clarify that it creates a unary selector > only... > > Bring back #asLegalSelector > https://pharo.fogbugz.com/default.asp?14969 > Fix in inbox: SLICE-Issue-14969-Bring-back-asLegalSelector-SeanDeNigris.1 > I think that this is better that you package it with your app. I do not see the point to have this method fromGarbageToUnarySelector in String. Stef

Feb. 21, 2015

Re: [Pharo-dev] Example implementation of associations with Slots in Pharo 4.0

by stepharo

Hi Jan Excellent! We know exactly whay we want slots and this is exactly for such kind of extensions. you may want to read the paper of Kasper Osterbye http://itu.dk/people/kasper/cv.htm R.11 Kasper Ãsterbye. Associations as a Language Construct. In Proceedings of TOOLS 29, Ed. Richard Michel et.al., Nancy, June 7-10 1999. Page 224-235. (pdf) I would love to have a nice package with such relationships because we used them all the time. I will blog about your nice experience. We should probably find a nicer way to declare them. Stef Le 21/2/15 21:11, Jan van de Sandt a Ã©crit : > Today I experimented a little with the new Slots feature of Pharo 4.0. > As an example I implemented support for associations/relationships. > > With it you can link two slots together so an update on one side will > also update the other side of the association/relationship. > > I used these Movie and Person classes for testing: > > Object subclass: #SlotExampleMovie > slots: { > #name. > #year. > ToOneAssociationSlot named: #director target: #SlotExamplePerson > inverse: #directedMovies. > ToManyAssociationSlot named: #actors target: #SlotExamplePerson > inverse: #actedInMovies } > classVariables: { } > category: 'SlotAssociations-Tests-Example' > Object subclass: #SlotExamplePerson > slots: { > #name. > ToManyAssociationSlot named: #directedMovies target: #SlotExampleMovie > inverse: #director. > ToManyAssociationSlot named: #actedInMovies target: #SlotExampleMovie > inverse: #actors } > classVariables: { } > category: 'SlotAssociations-Tests-Example' > > With this definition the director of a Movie must be a Persion > instance. When you set the director of a movie this movie is > automatically added to the directedMovies collection of that person. > Off course it also works the other way around. > > It took very little code to add these association slots. I think Slots > are a really nice addition to Pharo! If anyone wants to have a look at > the code: > > MCHttpRepository > location: 'http://smalltalkhub.com/mc/JanVanDeSandt/Stuff/main' > user: '' > password: '' > > Jan.

Feb. 21, 2015

Re: [Pharo-dev] If you want to flex your brain and do useful stuff for the world in Smalltalk

by Yuriy Tymchuk

I guess that the point is to implement some common things in different languages, so one can compare them or learn other language based on that one he/she knows. Uko > On 21 Feb 2015, at 19:44, Peter UhnÃ¡k <i.uhnak(a)gmail.com> wrote: > > On second thoughts I'm unsure of any practical uses of this site since they make quite arbitrary tasks. > > E.g. "CSV data manipulation: ... authors may assume that the data fields contain no commas, backslashes, or quotation marks" > That is for most practical purposes quite useless... or handwriting md5. > > But I guess as an exercise it could be still useful (for the person writing it). > > > On Sat, Feb 21, 2015 at 7:30 PM, Peter UhnÃ¡k <i.uhnak(a)gmail.com <mailto:i.uhnak@gmail.com>> wrote: > Interesting list! > > Btw. didn't Natalia made this already http://rosettacode.org/wiki/Voronoi_diagram <http://rosettacode.org/wiki/Voronoi_diagram> ? > > On Sat, Feb 21, 2015 at 6:31 PM, Yuriy Tymchuk <yuriy.tymchuk(a)me.com <mailto:yuriy.tymchuk@me.com>> wrote: > http://rosettacode.org/wiki/Reports:Tasks_not_implemented_in_Smalltalk <http://rosettacode.org/wiki/Reports:Tasks_not_implemented_in_Smalltalk> > > >

Feb. 21, 2015

Example implementation of associations with Slots in Pharo 4.0

by Jan van de Sandt

Today I experimented a little with the new Slots feature of Pharo 4.0. As an example I implemented support for associations/relationships. With it you can link two slots together so an update on one side will also update the other side of the association/relationship. I used these Movie and Person classes for testing: Object subclass: #SlotExampleMovie slots: { #name. #year. ToOneAssociationSlot named: #director target: #SlotExamplePerson inverse: #directedMovies. ToManyAssociationSlot named: #actors target: #SlotExamplePerson inverse: #actedInMovies } classVariables: { } category: 'SlotAssociations-Tests-Example' Object subclass: #SlotExamplePerson slots: { #name. ToManyAssociationSlot named: #directedMovies target: #SlotExampleMovie inverse: #director. ToManyAssociationSlot named: #actedInMovies target: #SlotExampleMovie inverse: #actors } classVariables: { } category: 'SlotAssociations-Tests-Example' With this definition the director of a Movie must be a Persion instance. When you set the director of a movie this movie is automatically added to the directedMovies collection of that person. Off course it also works the other way around. It took very little code to add these association slots. I think Slots are a really nice addition to Pharo! If anyone wants to have a look at the code: MCHttpRepository location: 'http://smalltalkhub.com/mc/JanVanDeSandt/Stuff/main' user: '' password: '' Jan.

Feb. 21, 2015

Re: [Pharo-dev] If you want to flex your brain and do useful stuff for the world in Smalltalk

by Natalia Tymchuk

)) Itâs not the same. They are finding to which point which pixel is the closest. I want to get the polygons. > On 21 Feb 2015, at 19:30, Peter UhnÃ¡k <i.uhnak(a)gmail.com> wrote: > > Interesting list! > > Btw. didn't Natalia made this already http://rosettacode.org/wiki/Voronoi_diagram <http://rosettacode.org/wiki/Voronoi_diagram> ? > > On Sat, Feb 21, 2015 at 6:31 PM, Yuriy Tymchuk <yuriy.tymchuk(a)me.com <mailto:yuriy.tymchuk@me.com>> wrote: > http://rosettacode.org/wiki/Reports:Tasks_not_implemented_in_Smalltalk <http://rosettacode.org/wiki/Reports:Tasks_not_implemented_in_Smalltalk> > >

Feb. 21, 2015

Re: [Pharo-dev] If you want to flex your brain and do useful stuff for the world in Smalltalk

by Peter UhnÃ¡k

On second thoughts I'm unsure of any practical uses of this site since they make quite arbitrary tasks. E.g. "CSV data manipulation: ... authors may assume that the data fields contain no commas, backslashes, or quotation marks" That is for most practical purposes quite useless... or handwriting md5. But I guess as an exercise it could be still useful (for the person writing it). On Sat, Feb 21, 2015 at 7:30 PM, Peter UhnÃ¡k <i.uhnak(a)gmail.com> wrote: > Interesting list! > > Btw. didn't Natalia made this already > http://rosettacode.org/wiki/Voronoi_diagram ? > > On Sat, Feb 21, 2015 at 6:31 PM, Yuriy Tymchuk <yuriy.tymchuk(a)me.com> > wrote: > >> http://rosettacode.org/wiki/Reports:Tasks_not_implemented_in_Smalltalk >> >> >

Feb. 21, 2015

Re: [Pharo-dev] If you want to flex your brain and do useful stuff for the world in Smalltalk

by Peter UhnÃ¡k

Interesting list! Btw. didn't Natalia made this already http://rosettacode.org/wiki/Voronoi_diagram ? On Sat, Feb 21, 2015 at 6:31 PM, Yuriy Tymchuk <yuriy.tymchuk(a)me.com> wrote: > http://rosettacode.org/wiki/Reports:Tasks_not_implemented_in_Smalltalk > >

Feb. 21, 2015

If you want to flex your brain and do useful stuff for the world in Smalltalk

by Yuriy Tymchuk

http://rosettacode.org/wiki/Reports:Tasks_not_implemented_in_Smalltalk

Feb. 21, 2015

Re: [Pharo-dev] Protocols, Privacy, and Extensions - NOT One Big Happy Family

by stepharo

Camille proposed and implemented a module system in which extensions are local to the packages. Now putting it in production requires some work. Stef > It will be fun to have these concepts distinguished on their own some day :) > > How do I create a form from a file? > Let's check the instance creation protocol... > Nothing there. > Hmm... I recall something about ImageMorph... > In ImageMorph's class comment: "Form fromFileNamed: 'myGraphicsFileName'..." > WHT?! > Go back to browsing Form's class-side > "Protocol": *Graphics-Files -> #fromFileNamed: > Ugh..... > > > > ----- > Cheers, > Sean > -- > View this message in context: http://forum.world.st/Protocols-Privacy-and-Extensions-NOT-One-Big-Happy-Fa… > Sent from the Pharo Smalltalk Developers mailing list archive at Nabble.com. > >

Feb. 21, 2015