Design Patterns and Collection Classes
Helge Horch
Helge.Horch at t-online.de
Thu Aug 29 13:06:45 UTC 2002
On 29.08.2002, Richard A. O'Keefe wrote:
> "class instance creation methods"
> key: k value: v
> ^self new pvtKey: k value: v
>
>Except that this won't work; practically the only time I ever really
>need 'pvt' methods is so that a class can initialise a new instance
>without the initialisation method being exposed to another class, but
>the 'pvt' machinery will not let you do this: "private messages may
>only be sent to self". If only there were a category of private messages
>that a class could send to 'self new'. So the method _really_ has to be
>called #privateKey:value: and we just have to _hope_ that no outsider
>will use it. So much for private methods.
But we can make it allow that! It's just a small tweak in the
Compiler, find my first hack at it attached.
This hack could be extended to also allow "super new" and "super
new:", and maybe even check that it's compiling a class side method.
I'll leave that open for discussion.
HTH,
Helge
P.S. Thanks, BTW, for mentioning
>Anyone read the paper about Smalltalk collections in OOPSLA 92?
I googled that you probably meant William R. Cook's "Interfaces and
Specifications for the Smalltalk-80 Collection Classes", and CiteSeer
was able to come up with a location on the web. A *very* interesting
read indeed.
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