From: "Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de>
Subject: Re: {Pre,Post}conditions and side effects
Date: Sat, 9 May 2015 07:47:06 +0200
Date: 2015-05-09T07:47:06+02:00 [thread overview]
Message-ID: <11lbvusnpmkxa$.1wtukr2t396em$.dlg@40tude.net> (raw)
In-Reply-To: mijgjc$t45$1@loke.gir.dk
On Fri, 8 May 2015 18:24:28 -0500, Randy Brukardt wrote:
> "Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de> wrote in message
> news:12gipcoheoucz.15ckvrgi11h3a.dlg@40tude.net...
>> On Thu, 7 May 2015 14:01:34 -0500, Randy Brukardt wrote:
> ...
>> The point is that these are fundamentally different things. Correctness is
>> outside. Behavior is inside.
>
> The only thing that matters is behavior. I care about correctness of the
> behavior
Everybody does. The issues are
1. what correctness is
2. how correctness can be addressed at the language level
Effectively you say that you don't bother with #2.
> (which for Ada, mainly boils down to how and when exceptions are
> possible).
Don't you care if 2+2 gives 4 in Ada?
> There is no such thing as a correct program (or part of a program) outside
> of its behavior.
So long correctness is defined in terms of behavior, there is no problem to
have correct programs.
> It's madness to even talk about it. Programming languages
> aren't defined well enough for the concept to be remotely meaningful.
You don't need it well defined. A program can be correct even if written in
C or Basic. Proving correct /= being correct.
--
Regards,
Dmitry A. Kazakov
http://www.dmitry-kazakov.de
next prev parent reply other threads:[~2015-05-09 5:47 UTC|newest]
Thread overview: 107+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-12-22 16:22 {Pre,Post}conditions and side effects Jean François Martinez
2014-12-22 17:18 ` Brad Moore
2014-12-23 8:22 ` Jean François Martinez
2014-12-23 17:05 ` Robert A Duff
2014-12-23 21:09 ` Jean François Martinez
2014-12-23 21:35 ` Robert A Duff
2014-12-23 23:02 ` Peter Chapin
2014-12-24 1:03 ` Robert A Duff
2015-04-24 8:59 ` Jacob Sparre Andersen
2015-04-24 9:18 ` J-P. Rosen
2015-04-24 23:39 ` Randy Brukardt
2015-04-24 12:10 ` G.B.
2015-04-24 14:40 ` Jacob Sparre Andersen
2015-04-24 16:29 ` G.B.
2015-04-24 23:46 ` Randy Brukardt
2015-04-24 22:26 ` Peter Chapin
2015-04-25 0:13 ` Randy Brukardt
2015-04-25 1:01 ` Peter Chapin
2015-04-25 5:51 ` Dmitry A. Kazakov
2015-04-25 0:31 ` Bob Duff
2015-04-25 12:08 ` vincent.diemunsch
2015-04-25 16:37 ` Georg Bauhaus
2015-05-06 21:07 ` Randy Brukardt
2015-05-06 22:10 ` Paul Rubin
2015-05-07 9:01 ` Georg Bauhaus
2015-05-07 9:12 ` Dmitry A. Kazakov
2015-05-07 9:29 ` Georg Bauhaus
2015-05-07 9:31 ` Georg Bauhaus
2015-05-07 18:32 ` Randy Brukardt
2015-05-08 7:50 ` Dmitry A. Kazakov
2015-05-08 23:31 ` Randy Brukardt
2015-05-09 6:16 ` Dmitry A. Kazakov
2015-05-12 0:28 ` Randy Brukardt
2015-05-12 8:04 ` Dmitry A. Kazakov
2015-05-07 10:06 ` Stefan.Lucks
2015-05-07 12:16 ` Dmitry A. Kazakov
2015-05-07 18:00 ` Stefan.Lucks
2015-05-07 19:01 ` Randy Brukardt
2015-05-07 19:29 ` Niklas Holsti
2015-05-08 23:16 ` Randy Brukardt
2015-05-09 5:18 ` Niklas Holsti
2015-05-12 0:15 ` Randy Brukardt
2015-05-07 19:55 ` Dmitry A. Kazakov
2015-05-08 23:24 ` Randy Brukardt
2015-05-09 5:47 ` Dmitry A. Kazakov [this message]
2015-05-07 18:52 ` Randy Brukardt
2015-05-07 19:40 ` Stefan.Lucks
2015-05-08 7:28 ` Dmitry A. Kazakov
2015-05-08 22:58 ` Randy Brukardt
2015-05-08 22:52 ` Randy Brukardt
2015-05-09 0:14 ` Paul Rubin
2015-05-12 0:30 ` Randy Brukardt
2015-05-12 18:10 ` Paul Rubin
2015-05-12 22:01 ` Randy Brukardt
2015-05-13 9:35 ` Dmitry A. Kazakov
2015-05-13 11:53 ` G.B.
2015-05-13 12:47 ` Dmitry A. Kazakov
2015-05-13 14:06 ` G.B.
2015-05-13 14:21 ` Dmitry A. Kazakov
2015-05-13 16:33 ` G.B.
2015-05-13 19:15 ` Dmitry A. Kazakov
2015-05-14 1:36 ` Randy Brukardt
2015-05-14 7:10 ` Dmitry A. Kazakov
2015-05-14 1:32 ` Randy Brukardt
2015-05-14 7:19 ` Dmitry A. Kazakov
2015-05-12 0:36 ` Randy Brukardt
2015-05-11 10:35 ` Stefan.Lucks
2015-05-11 21:49 ` vincent.diemunsch
2015-05-11 22:49 ` Peter Chapin
2015-05-12 4:49 ` vincent.diemunsch
2015-05-12 23:25 ` Peter Chapin
2015-05-13 9:00 ` vincent.diemunsch
2015-05-12 4:42 ` vincent.diemunsch
2015-05-12 14:53 ` johnscpg
2015-05-13 9:14 ` vincent.diemunsch
2015-05-12 1:03 ` Randy Brukardt
2015-05-12 7:21 ` Georg Bauhaus
2015-05-12 22:08 ` Randy Brukardt
2015-05-12 8:02 ` Georg Bauhaus
2015-05-12 22:14 ` Randy Brukardt
2015-05-12 8:37 ` Stefan.Lucks
2015-05-12 11:25 ` Stefan.Lucks
2015-05-12 18:44 ` Paul Rubin
2015-05-12 20:52 ` Stefan.Lucks
2015-05-18 9:49 ` Jacob Sparre Andersen
2015-05-18 12:10 ` Stefan.Lucks
2015-05-19 7:46 ` Jacob Sparre Andersen
2015-06-09 7:55 ` Stefan.Lucks
2015-06-09 12:02 ` G.B.
2015-06-09 17:16 ` Stefan.Lucks
2015-05-12 18:39 ` Paul Rubin
2015-05-12 20:51 ` Stefan.Lucks
2015-05-12 14:21 ` Bob Duff
2015-05-12 22:37 ` Randy Brukardt
2015-05-13 6:58 ` Georg Bauhaus
2015-05-14 1:21 ` Randy Brukardt
2015-05-07 21:29 ` Georg Bauhaus
2015-05-08 23:11 ` Randy Brukardt
2015-05-08 23:19 ` tmoran
2014-12-23 21:53 ` Florian Weimer
2014-12-24 11:41 ` Brad Moore
2014-12-22 19:38 ` sbelmont700
2014-12-22 19:59 ` Brad Moore
2014-12-22 23:46 ` Randy Brukardt
2014-12-23 10:41 ` Georg Bauhaus
2014-12-22 23:32 ` Randy Brukardt
2015-04-24 17:59 ` Shark8
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