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Re: On Pseudohashes
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From:
Graham Barr
Date:
January 17, 2000 06:38
Subject:
Re: On Pseudohashes
Message ID:
20000117143549.S887@pobox.com
On Mon, Jan 17, 2000 at 03:28:03PM +0100, Raphael Manfredi wrote:
> Quoting tchrist@chthon.perl.com:
> :Tim, some time ago something came up about autoloading method calls
> :that bothered me in an MI scenario. Seems to me you respondedi
> :similarly then. I'm pretty sure it was the following inheritance
> :scenario:
> :
> : A
> : \
> : B C @B::ISA = ('A');
> : \ /
> : D @D::ISA = ('B', 'C');
> :
> :Suppose that each of those classes were using autoloading to generate
> :its attribute accessors. If D->m() is called, and that method m()
> :is really supposed to be handled iby C, there's no way for B's
> :autoload to "super" it over to C. Instead, B::SUPER just gets to
> :ascend to A--which doesn't help. You can never renege on an AUTOLOAD
> :so that Perl's method lookup would treat that hit as a miss and
> :then go on to inspect sibling branches of the tree.
>
> I fail to see how AUTOLOAD is connected to this problem. Even if B did
> not have an autoloaded m(), then A's m() would be used, since Perl
> looks up the tree starting with B, in a depth-first order.
If no package declared m() then a search for AUTOLOAD would be
done. AUTOLOAD would be looked up in D B A C, so if B defined AUTOLOAD
and D did not then B::AUTOLOAD would be called.
Graham.
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