I would look at how Array or OrderedCollection is defined. Some objects
only have instance variables, and some have instance variables and
indexed slots (the so-called "variable" property of classes, perhaps
better described in terms of instances being "indexable" via
basicAt:/basicAt:put:). So, from what I've read so far, the problem is
that the class ClassBasedCharacterArray is being defined as
"non-indexable", and so you can't use new:.
Now, originally, I subclassed CharacterArray because then I'd inherit
useful methods such as nice printString and what not. Strictly
speaking, however, any sort of "array" should do for what the book is
trying to show. If you want, you can also use the NC version of
VisualWorks to get the code going.
Finally, one of my to-dos is to convert my implementation to use
Assessments for its tests. I think it would be easier to release a sort
of official version in the public Store repository then. Alas, so much
to do, so little time. In the mean time, let me know if you need the
MIT license to appear somewhere.
Andres.
On 9/26/10 14:26 , Sean P. DeNigris wrote:
>
>
> Tobias Pape wrote:
>>
>> try to use
>>
>> ArrayedCollection variableSubclass: #ClassBasedCharacterArray
>> instanceVariableNames: ''
>> classVariableNames: ''
>> poolDictionaries: ''
>> category: 'Collections-Arrayed'
>>
>> (as in Array.)
>> As Alan Rodas points out, if the class isn't variable, #new: cannot be
>> used.
>>
>
> Thanks. Where can I read about what's actually happening here? I've never
> heard of this alternate subclass method, and I'm running into other
> problems.
>
> Sean
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