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Postings from April 2003
> -----Original Message-----
> From: Dave Whipp [mailto:dave@whipp.name]
> Sent: Saturday, April 26, 2003 10:48 PM
> To: perl6-language@perl.org
> Subject: Delayed Assignments, was Re: Fun with multi-dimension arrays
>
>
> Following up my own post, I wrote::
>
> > method update
> > {
> > locally_hypothesise @.grid; # what keyword?
> >
> > for @.grid.fully_flat_iterator -> $iter
> > {
> > .value = $self.next_state(.key)
> > }
> > }
> >
> > and next state will use the old values for @.grid:
>
> The solution is really quite simple, and needs no extra suff in the
> core. All we have to do is redefine the infix:= operator in the
> local scope:
>
> method update
> {
> my @assigs is keep { $_[0]=$_[1] for @assigns }
> my sub infix:=($lhs is rw, $rhs) { push @assigns, [$lhs, $rhs] };
>
> for @.grid.fully_flat_iterator
> {
> .value = $self.next_state(.key)
> }
> }
>
> Wrap that up in a C<delayed_assignments> module, et voila, were're done:
> transaction style updates.
And somehow you think this is SIMPLER than creating @new_grid?
=Austin
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