After some better testing, It doesn't work :S It seems that the initialize of the constants class isn't running... (the normal classVariableNames are working...) I have to use the poolDictionary because there are some codes that return in a lot of classes..
Mispunt On 2/27/07, Mispunt <[EMAIL PROTECTED]> wrote:
Thanks Bert, it works. When I am using the poolDictionary it isn't possible to use the constants in the Workspace right? or do I have to write methods for them when I want to use them? (well I don't want to, because it is just for testing purpose). Mispunt. On 2/27/07, Bert Freudenberg <[EMAIL PROTECTED]> wrote: > On Feb 27, 2007, at 10:08 , Mispunt wrote: > > > Hi all, > > > > For programming my Lego Mindstorms NXT I have to use codes like 16r1F. > > But I actually want to be able to use "readable" codes. In a language > > like Java I will do that with a static const, but as far as I know I > > have to do it with symbols in Smalltalk. > > No, there is a better way. > > If you are inside one class (or its subclasses), you would use "class > variables", one per constant. You add them in the class template: > > Object subclass: #Bla > instanceVariableNames: '' > classVariableNames: 'Const1 Const2' > poolDictionaries: '' > category: 'Bert-Bla' > > and the initialization code is in a class-side #initialize method: > > initialize > "self initialize" > Const1 := 16r1F. > Const2 := 12345. > > You need to execute the "self initialize" in the browser to do the > initialization. It will be executed automatically when loaded into > another image. > > Class variables are capitalized because they are sort-of "global", > they can be used in the defining class, its metaclass, and all their > subclasses. If you need to give access to these variables across the > class hierarchies, then you would do the same, but as a subclass of > SharedPool: > > SharedPool subclass: #BlaConstants > instanceVariableNames: '' > classVariableNames: 'Const1 Const2' > poolDictionaries: '' > category: 'Bert-Bla'. > > To use this "pool" of variables in another class, list it as a "pool > dictionary": > > Object subclass: #Bla > instanceVariableNames: '' > classVariableNames: '' > poolDictionaries: 'BlaConstants' > category: 'Bert-Bla' > > This makes all class variables of BlaConstants available to Bla as if > they were class variables. > > There are quite a few other ways to allow "global" variables in > Smalltalk, but this one is the "clean" way to do it which works > nicely with tools like Monticello. > > - Bert - > > > > _______________________________________________ > Beginners mailing list > Beginners@lists.squeakfoundation.org > http://lists.squeakfoundation.org/mailman/listinfo/beginners >
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