On Wed, 10 Oct 2001 15:42:29 +1000 (EST), Damian Conway wrote:
>Brent asked:
>
> > If we have 'and', 'or' and 'xor', can we have 'dor' (defined or) to be a
> > low-precedence version of this?
>
>I actually suggested exactly that to Larry a few weeks back.
>
>He likes the idea, but is having trouble finding an acceptable name for the
>operator.
I'm not convinced it's that useful... The precedence of "dor" would be
lower than that of assignment. And it's precisely in assignment where
the "//" operator will come in very handy.
If you don't need to assign the value of the expression, you can just as
wel use defined():
defined($x = foo()) or die "Got an undefined value!";
Plus there's the matter of the name...
Do we really need low and high precedence equivalents of every boolean
operator? Next, you'll want a low precedence "?:" (or "??::"). We have
one already: if/else, but except in do blocks, you can't really use them
for expressions.
--
Bart.
