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Postings from June 2001
On Fri, Jun 29, 2001 at 08:59:59AM -0400, John Porter wrote:
> Michael G Schwern wrote:
> > Second, and perhaps more importantly, we can do this perfectly well
> > with a module. No hacks, no tricks, no filters.
> > Class::Object uses the mini-class technique (ie. auto-generated
> > classes
>
> Sorry, that sounds like a hack/trick if ever there was one.
> I would sure hope there would be a cleaner way to do it in
> perl6, if it's not part of the core language.
"Any sufficiently encapsulated hack is no longer a hack."
Besides, that's EXACTLY what you're conceptually doing! Each object
acts like its a member of its own class. So you just implement it
that way.
> It's also not without its faults. Having every instance of a
> class have different values of ref() could be obnoxious, for
> example.
Why? You shouldn't be relying on an object's reference. ref $obj eq
'Some::Class' wrecks subclassing, $obj->isa('Some::Class') is the
right way.
> > The rule of thumb has always been if you can do it in a module, don't
> > put it in the core.
>
> No, that's a lousy rule of thumb. The tradeoffs must be considered.
> Otherwise we'd have Forth. (Or Lisp, ca. 1960.)
What's the trade-off here? It works, its efficient, the hacks are
well encapsulated.
--
Michael G Schwern <schwern@pobox.com> http://www.pobox.com/~schwern/
Perl6 Quality Assurance <perl-qa@perl.org> Kwalitee Is Job One
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