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Re: reduce metaoperator
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From:
Aaron Sherman
Date:
May 4, 2005 06:34
Subject:
Re: reduce metaoperator
Message ID:
1115213668.9630.16666.camel@pps
On Wed, 2005-05-04 at 09:06, Larry Wall wrote:
> On Wed, May 04, 2005 at 09:00:46AM -0400, Aaron Sherman wrote:
> : That said, let me try to be helpful, and not just complain:
> :
> : $sum = (+) @array;
> It's certainly one of the ones I considered, along with all the other
> brackets, and |+|, plus variants
I could see [], but the others don't have any mnemonic for
list-opification.
Hmmm...
$sum = [+] @array
Nice.
> It just seemed like it'd be a little
> visually confusing where you want to turn the list op into a function
>
> $sum = (+)(@array);
$sum = [+](1,2,3);
Not bad, not bad.
> But maybe that's not a problem. But there are other potential
> ambiguities besides visual, I suspect.
Juerd mentioned x, which is certainly one such. Any \w+ keyword is going
to be a problem, but I think you can make the case for any:
sub infix:foo($a,$b){...}
enforcing correct handling of:
sub list:[foo](*@list) {...}
Oh hey, I just made up "list:..." There's nothing for that listed in
A12, and that handy table from A12 doesn't show up in S12 or S13... is
that an oversight? Have new categories been added?
--
Aaron Sherman <ajs@ajs.com>
Senior Systems Engineer and Toolsmith
"It's the sound of a satellite saying, 'get me down!'" -Shriekback
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