Hi Hilaire,
on Wed, 23 Jan 2008 09:49:07 +0100, you wrote:
Le mardi 22 janvier 2008 à 22:16 +0000, 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
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