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From: Adam Beneschan <adam@irvine.com>
Newsgroups: comp.lang.ada
Subject: Re: What would you like in Ada202X?
Date: Thu, 26 Apr 2012 08:28:33 -0700 (PDT)
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Date: 2012-04-26T08:28:33-07:00
List-Id: <comp.lang.ada>

On Thursday, April 26, 2012 12:43:00 AM UTC-7, Mart van de Wege wrote:
> Adam Beneschan writes:
>=20
> > On Wednesday, April 25, 2012 1:12:28 PM UTC-7,
> > okel...@users.sourceforge.net wrote:
> >> On Wednesday, April 25, 2012 9:15:13 PM UTC+2, Adam Beneschan wrote:
> >> >  And why would having a "continue" statement be better than the
> >> > workaround?
> >>  Conciseness, plus avoidance of gratuitous "goto" (banned by various
> >> coding guidelines)
> >
> > This is the sort of thing that makes me want to cry.  There's a reason
> > "goto" is banned from some coding guidelines, and it's not because one
> > day Dijkstra came down from a mountain with a slab that said "Thou
> > shalt not use goto".  It's banned because in most cases, using it
> > negatively impacts readability and (as Jeff said) there's almost
> > always a better way.  I've tried to argue here that using "continue"
> > is worse for readability than using a "goto" in this case--so if I'm
> > right, it would make no sense to have coding guidelines that disallow
> > "goto" and allow "continue".  Of course, if you're able to argue that
> > the "continue" is more readable in this case, please do so.  But I
> > suspect that's not possible if ...
> >
> Hmm.
>=20
> I like the Perl use of 'next' and 'last' to influence looping.
>=20
> Especially when looping over a list of values, it is nice to test for
> values you don't want to process at the start of the loop, and
> immediately go to the next iteration.
>=20
> The canonical example is processing a file with comment lines starting
> with '#':
>=20
> while (<$file>) {
>       next if /^#/; # skip comment lines
>       [...Do stuff with line ...]
> }

OK, I'll have to admit that I do stuff like this when I use Perl.  On the o=
ther hand, the mere fact that I've decided to write something in Perl indic=
ates that I don't care about readability for that particular program.  I'd =
rather not have Ada head in the same direction.  Plus, I think this is OK i=
n a small loop (maybe a dozen lines) that could be mentally "eaten in one b=
ite".

                   -- Adam