On Wed, Jun 24, 2009 at 10:35 AM, John Macdonald<j...@perlwolf.com> wrote:
> On Tue, Jun 23, 2009 at 07:51:45AM +1000, Damian Conway wrote:
>> Perl 6's approach to xor is consistent with the linguistic sense of
>> 'xor' ("You may have a soup (x)or a salad (x)or a cocktail"), [ ... ]
>
> That choice tends to mean "exactly one", rather than "the first one
> the waiter hears". (A good waiter will explain the choice limitation
> at the time the order is made rather than having to deal with it
> being escalated to a complaint when the "missing" item is demanded.)
>
> Which means that short-circuiting is not right here - it must
> go through the entire list to determine whether there are zero
> true selections, find the first of exactly one true selections,
> or die if there are more than one true selections.
Which, I believe, is exactly how XOR short-circuiting currently works:
it short-circuits to false if both sides are true; otherwise, it
returns true or false as usual for XOR and continues on down the
chain.
--
Jonathan "Dataweaver" Lang
