> From an old summary:
>
> http://www.perl.com/pub/a/2003/04/p6pdigest/20030427.html?page=2
>
> > Paul Hodges took a crack at implementing for as a subroutine and came
> up with
> > something that didn't look too insane. Luke Palmer added a refinement
> allowing
> > for n at a time looping. However, for reasons that I can't quite put
> my finger
> > on, I'm not quite sure that either method has got the sub signature
> quite
> > right, and I'm not entirely sure how you would express for's
> signature as a
> > Perl 6 signature anyway. Answers on a mailing list please.
>
> Did this ever get resolved to anyone's satisfaction? While reading
> EX6, I found myself wonder exactly what for() would look like in Perl 6
> code...
Well, I don't think it's possible, actually. There's a flattening
list context at the beginning (implying a sugary drink from 7 eleven),
followed by a code block. But, as we know, slurpy arrays can only
come at the end of positional parameters.
But, assuming that is possible, here's C<for> in its entirety:
sub for ([EMAIL PROTECTED], &block) {
while @list {
block( [EMAIL PROTECTED](0, &block.arity) );
}
}
That's not handling NEXT blocks, et al. But I think that's just a
matter of putting &block.NEXT(), &c. in the appropriate places.
Luke
> -John
