Re: names, values, boxes and microchips

From	Charles DeRykus <derykus@gmail.com>
Newsgroups	comp.lang.perl.misc
Subject	Re: names, values, boxes and microchips
Date	2013-07-21 16:29 -0700
Organization	Aioe.org NNTP Server
Message-ID	<kshqtl$u0r$1@speranza.aioe.org> (permalink)
References	<87a9lmi67s.fsf@sapphire.mobileactivedefense.com> <87r4es5idv.fsf@sapphire.mobileactivedefense.com> <fogtba-pi21.ln1@anubis.morrow.me.uk> <87r4er1yh9.fsf@sapphire.mobileactivedefense.com> <sn1uba-8851.ln1@anubis.morrow.me.uk>

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On 7/21/2013 2:51 PM, Ben Morrow wrote:
>
> Quoth Rainer Weikusat <rweikusat@mssgmbh.com>:
>> Ben Morrow <ben@morrow.me.uk> writes:
> ...
> Let's look at the main loop from your original post:
>
>      LOOP: {
> 	($rc) = $in_item->net_compare($filter_item);
>
> 	p_alloc('in %s, filter %s, rc %u',
> 		$in_item, $filter_item, $rc);
> 	
> 	given ($rc) {
> 	    when (R_AFTER) {
> 		push(@out, $in_item);
> 		&$step_in;
> 	    }
>
> 	    when ([R_BEFORE, R_SUB]) {
> 		&$step_filter;
> 	    }
>
> 	    when ([R_SAME, R_SUPER]) {
> 		p_alloc('%s: dropping %s (%s)', __func__,
> 			$in_item, $filter_item);
> 		
> 		&$step_in;
> 	    }
> 	}
>
> 	redo;
>      }
>
> When does it terminate? How does it make progress? It's not even
> immediately clear it's a *loop*: while (1) or for (;;) are the
> conventional idioms.
> ...

Even a more expressive 'do' might help a dizzy brain:


do {
      ....
}
until $in_pos == @$in or $filter_pos == @$filter;


-- 
Charles DeRykus

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Thread

names, values, boxes and microchips Rainer Weikusat <rweikusat@mssgmbh.com> - 2013-07-16 21:45 +0100
  Re: names, values, boxes and microchips Ben Morrow <ben@morrow.me.uk> - 2013-07-19 17:07 +0100
    Re: names, values, boxes and microchips Rainer Weikusat <rweikusat@mssgmbh.com> - 2013-07-19 17:38 +0100
      Re: names, values, boxes and microchips Rainer Weikusat <rweikusat@mssgmbh.com> - 2013-07-19 19:28 +0100
        Re: names, values, boxes and microchips Ben Morrow <ben@morrow.me.uk> - 2013-07-20 00:11 +0100
          Re: names, values, boxes and microchips Rainer Weikusat <rweikusat@mssgmbh.com> - 2013-07-20 15:02 +0100
            Re: names, values, boxes and microchips Ben Morrow <ben@morrow.me.uk> - 2013-07-20 16:45 +0100
            Re: names, values, boxes and microchips Rainer Weikusat <rw@sapphire.mobileactivedefense.com> - 2013-07-21 11:15 +0100
              Re: names, values, boxes and microchips gamo@telecable.es - 2013-07-21 12:47 +0000
                Re: names, values, boxes and microchips Shmuel (Seymour J.) Metz <spamtrap@library.lspace.org.invalid> - 2013-07-23 07:14 -0400
                Re: names, values, boxes and microchips gamo@telecable.es - 2013-07-23 20:43 +0000
                Re: names, values, boxes and microchips Rainer Weikusat <rweikusat@mssgmbh.com> - 2013-07-24 11:23 +0100
                Re: names, values, boxes and microchips Ben Morrow <ben@morrow.me.uk> - 2013-07-23 23:10 +0100
              Re: names, values, boxes and microchips Ben Morrow <ben@morrow.me.uk> - 2013-07-21 18:01 +0100
                Re: names, values, boxes and microchips Rainer Weikusat <rweikusat@mssgmbh.com> - 2013-07-21 20:53 +0100
                Re: names, values, boxes and microchips Ben Morrow <ben@morrow.me.uk> - 2013-07-21 22:51 +0100
                Re: names, values, boxes and microchips Charles DeRykus <derykus@gmail.com> - 2013-07-21 16:29 -0700
                Re: names, values, boxes and microchips Rainer Weikusat <rweikusat@mssgmbh.com> - 2013-07-22 01:20 +0100
                Re: names, values, boxes and microchips Rainer Weikusat <rweikusat@mssgmbh.com> - 2013-07-22 01:06 +0100
                [OT] naming conventions Rainer Weikusat <rweikusat@mssgmbh.com> - 2013-07-22 10:35 +0100

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