On 4/3/02 12:49 PM, Jonathan Scott Duff wrote:
> On Wed, Apr 03, 2002 at 12:41:13PM -0500, John Siracusa wrote:
>> Reading EX4 and seeing those "place-holder" variables made me wonder what
>> happens when someone (probably Damian ;) wants to use more than 26 of them.
>> Do the place-holder names scale up as if they're being automagically
>> incremented? (e.g. ..., y, z, aa, ab, ...)
>
> As I understand it, those place holders could be anything. So he could
> have written
>
> our %operator is private //= (
> '*' => { $^foo * $^bar },
> '/' => { $^foo / $^bar },
> '~' => { ($^foo + $^bar) / 2 },
> );
>
> and it would work just as well.
So it's the order that they appear that determines their binding? How would
something like this (Perl 5 code) be represented:
sub reverse_minus { $_[1] - $_[0] }
I would have guessed it'd be:
{ $^b - $^a }
But if the place-holder names can be anything, I'm not sure how you could
bind place-holders "out of order" with respect to the things that they
alias.
-John
