[Newbies] Re: block in recursion, Any cure for that kind of situation?
Le mardi 22 janvier 2008 à 22:16 +, Marcin Tustin a écrit : I'm an idiot. That doesn't work either. Why not? Because still nested, I guess. Anyway I want to use that for teacher to design programmaticaly interactige geometry figure for Drgeo. So it have to keep simple and be usable in a Workspace. The only alternative I see is to define a class with methods, but it is a bit more complex for the target audiance. Hilaire signature.asc Description: Ceci est une partie de message numériquement signée ___ Beginners mailing list Beginners@lists.squeakfoundation.org http://lists.squeakfoundation.org/mailman/listinfo/beginners
[Newbies] Re: block in recursion, Any cure for that kind of situation?
Indeed, and I am adapting from DrGeo1.1 which embede the Guile Scheme interpretor, see http://documentation.ofset.org/drgeo/fr/drgenius_93.html Hilaire Le mardi 22 janvier 2008 à 15:42 -0800, Ben Goetter a écrit : This is a maintenance nightmare waiting to happen. Use a proper method call, Squeak Smalltalk blocks are just similar enough to Scheme lambdas that I still fall into this trap, too. (letrec ((carre (lambda (s1 s2 s3 s4 n) (if ( n 0) (carre (segment s1 s2) (segment s2 s3) (segment s3 s4) (segment s1 s4) (- n 1)) 'oops-must-remember-this-is-Squeak-not-Scheme) Ben signature.asc Description: Ceci est une partie de message numériquement signée ___ Beginners mailing list Beginners@lists.squeakfoundation.org http://lists.squeakfoundation.org/mailman/listinfo/beginners
[Newbies] Re: block in recursion, Any cure for that kind of situation?
Hi Hilaire, on Wed, 23 Jan 2008 09:49:07 +0100, you wrote: Le mardi 22 janvier 2008 à 22:16 +, Marcin Tustin a écrit : I'm an idiot. That doesn't work either. Why not? Because still nested, I guess. Anyway I want to use that for teacher to design programmaticaly interactige geometry figure for Drgeo. So it have to keep simple and be usable in a Workspace. The only alternative I see is to define a class with methods, but it is a bit more complex for the target audiance. You don't have to. I use recursive blocks in Smalltalk workspace all the time. The trick is from the Self language, which always clones activation record before using them. Example: recursiveBlock := [:argV | argV 1 ifFalse: [argV + (recursiveBlock clone value: argV - 1)] ifTrue: [argV]]. recursiveBlock clone value: 17 You could send #copy instead of #clone but I prefer the latter in honor of Self. Enjoy! /Klaus P.S. beware of the #fixTemps symptom in Squeak's implementation of blocks, was discussed several times over in squeak-dev. Hilaire ___ Beginners mailing list Beginners@lists.squeakfoundation.org http://lists.squeakfoundation.org/mailman/listinfo/beginners
[Newbies] Re: block in recursion, Any cure for that kind of situation?
Hi Klaus, Thanks for the tip, I also need the fixTemps. It is not very elegant but it works. See the vidéo: http://squeak.ofset.org/drgeo/spiral.ogg Klaus D. Witzel a écrit : Hi Hilaire, ___ Beginners mailing list Beginners@lists.squeakfoundation.org http://lists.squeakfoundation.org/mailman/listinfo/beginners
