From: "Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de>
Subject: Re: Safety of unprotected concurrent operations on constant objects
Date: Thu, 15 May 2014 16:27:30 +0200
Date: 2014-05-15T16:27:30+02:00 [thread overview]
Message-ID: <oiqjtov5sngt$.2785yqcvqig5$.dlg@40tude.net> (raw)
In-Reply-To: wcck39n6uut.fsf@shell01.TheWorld.com
On Thu, 15 May 2014 09:21:14 -0400, Robert A Duff wrote:
> "Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de> writes:
>
>> You *cannot* increase the power of prover later on, as you and others seem
>> to suggest.
>
> Why not?
Because inability to prove that contract X is fulfilled by a party P makes
P illegal. [*]
Unless you accept making illegal programs legal, you must not allow the
prover's power to change.
Example from existing Ada:
function Foo return Integer is
begin
raise Constraint_Error;
end Foo;
This program is illegal, though GNAT posses the power to prove Foo's
"contract" fulfilled (vaguely: no junk result returned). Yet the language
requires this power constrained. The mandated power is that it is
non-provable that the code following raise were unreachable.
--------------
* If we talk about contracts proper. Per definition, a contract violation
makes the program illegal
--
Regards,
Dmitry A. Kazakov
http://www.dmitry-kazakov.de
next prev parent reply other threads:[~2014-05-15 14:27 UTC|newest]
Thread overview: 94+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-05-02 8:42 Safety of unprotected concurrent operations on constant objects Natasha Kerensikova
2014-05-03 13:43 ` sbelmont700
2014-05-03 20:54 ` Natasha Kerensikova
2014-05-03 21:40 ` Simon Wright
2014-05-04 0:28 ` Jeffrey Carter
2014-05-04 7:46 ` Natasha Kerensikova
2014-05-04 8:06 ` Dmitry A. Kazakov
2014-05-04 15:18 ` sbelmont700
2014-05-04 15:57 ` Natasha Kerensikova
2014-05-04 18:30 ` sbelmont700
2014-05-04 19:34 ` Dmitry A. Kazakov
2014-05-05 19:04 ` Brad Moore
2014-05-05 21:23 ` Brad Moore
2014-05-04 21:44 ` Shark8
2014-05-05 8:39 ` Simon Wright
2014-05-05 15:11 ` Brad Moore
2014-05-05 16:36 ` Dmitry A. Kazakov
2014-05-06 6:00 ` Brad Moore
2014-05-06 8:11 ` Dmitry A. Kazakov
2014-05-06 8:48 ` Alejandro R. Mosteo
2014-05-06 9:49 ` G.B.
2014-05-06 12:19 ` Dmitry A. Kazakov
2014-05-06 12:58 ` G.B.
2014-05-06 15:00 ` Dmitry A. Kazakov
2014-05-06 16:24 ` G.B.
2014-05-06 19:14 ` Dmitry A. Kazakov
2014-05-07 6:49 ` Georg Bauhaus
2014-05-07 7:40 ` Dmitry A. Kazakov
2014-05-07 11:25 ` G.B.
2014-05-07 12:14 ` Dmitry A. Kazakov
2014-05-07 13:45 ` G.B.
2014-05-07 14:08 ` Dmitry A. Kazakov
2014-05-07 17:45 ` Simon Wright
2014-05-07 18:28 ` Georg Bauhaus
2014-05-07 4:59 ` J-P. Rosen
2014-05-07 7:30 ` Dmitry A. Kazakov
2014-05-07 8:26 ` J-P. Rosen
2014-05-07 9:09 ` Dmitry A. Kazakov
2014-05-07 11:29 ` J-P. Rosen
2014-05-07 12:36 ` Safety of unprotected concurrent operations on constant objects (was: Safety of unprotected concurrent operations on constant objects) Dmitry A. Kazakov
2014-05-07 14:04 ` Safety of unprotected concurrent operations on constant objects G.B.
2014-05-08 4:12 ` Brad Moore
2014-05-08 8:20 ` Dmitry A. Kazakov
2014-05-08 10:30 ` G.B.
2014-05-09 13:14 ` Brad Moore
2014-05-09 19:00 ` Dmitry A. Kazakov
2014-05-10 12:30 ` Brad Moore
2014-05-10 20:27 ` Dmitry A. Kazakov
2014-05-11 6:56 ` Brad Moore
2014-05-11 18:01 ` Brad Moore
2014-05-12 8:13 ` Dmitry A. Kazakov
2014-05-13 4:50 ` Brad Moore
2014-05-13 8:56 ` Dmitry A. Kazakov
2014-05-13 15:01 ` Brad Moore
2014-05-13 15:38 ` Brad Moore
2014-05-13 16:46 ` Simon Wright
2014-05-13 19:15 ` Dmitry A. Kazakov
2014-05-13 16:08 ` Dmitry A. Kazakov
2014-05-13 20:27 ` Randy Brukardt
2014-05-14 4:30 ` Shark8
2014-05-14 21:37 ` Randy Brukardt
2014-05-14 21:56 ` Robert A Duff
2014-05-15 1:21 ` Shark8
2014-05-14 14:30 ` Brad Moore
2014-05-15 8:03 ` Dmitry A. Kazakov
2014-05-15 13:21 ` Robert A Duff
2014-05-15 14:27 ` Dmitry A. Kazakov [this message]
2014-05-15 15:53 ` Robert A Duff
2014-05-15 16:30 ` Dmitry A. Kazakov
2014-10-26 17:11 ` Jacob Sparre Andersen
2014-05-08 19:52 ` Randy Brukardt
2014-05-06 16:22 ` Robert A Duff
2014-05-06 19:07 ` Dmitry A. Kazakov
2014-05-08 5:03 ` Brad Moore
2014-05-08 12:03 ` Brad Moore
2014-05-08 19:57 ` Randy Brukardt
2014-05-09 2:58 ` Brad Moore
2014-05-05 20:29 ` Natasha Kerensikova
2014-05-08 3:41 ` Randy Brukardt
2014-05-08 9:07 ` Natasha Kerensikova
2014-05-08 19:35 ` Randy Brukardt
2014-05-08 3:12 ` Randy Brukardt
2014-05-05 22:30 ` Brad Moore
2014-05-04 16:04 ` Peter Chapin
2014-05-04 18:07 ` Natasha Kerensikova
2014-05-04 18:55 ` Jeffrey Carter
2014-05-04 19:36 ` Simon Wright
2014-05-04 20:29 ` Jeffrey Carter
2014-05-05 22:46 ` Brad Moore
2014-05-04 20:25 ` Shark8
2014-05-04 23:33 ` sbelmont700
2014-05-05 7:38 ` Dmitry A. Kazakov
2014-05-08 3:45 ` Randy Brukardt
2014-05-08 3:19 ` Randy Brukardt
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