On Thu, Oct 25, 2001 at 11:30:00AM +1000, Damian Conway wrote:
>
> Glenn wrote:
>
> > > Have I missed anything?
> >
> > Perhaps you've missed one thing.
> >
> > [snip]
> >
> > Perl 6 could provide a pragma to produce a warning on the first
> > run-time auto-numerification (compile time would be really hard to
> > do), together with a selection of different string numerification
> > methods for extracting the numeric values, for a variety of types
> > of numeric values.
>
> I believe this would be covered by the ability to lexically redefine
> C<operator:+($)>.
Hmm... this seems dangerous. In general a "numeric context" was imposed
in Perl5 by the function that needed it by calling SvNV. The overhead
that I see from externalizing that, and forcing:
$x + $y
To implicitly be:
+($x) + +($y)
is rather large (three times the stack management, type checking, etc)....
Is this really what we want?
--
Aaron Sherman
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