From: Georg Bauhaus <rm.dash-bauhaus@futureapps.de>
Subject: Re: Generic-Package Elaboration Question / Possible GNAT Bug.
Date: Tue, 22 Nov 2011 18:46:02 +0100
Date: 2011-11-22T18:46:03+01:00 [thread overview]
Message-ID: <4ecbdfdb$0$6629$9b4e6d93@newsspool2.arcor-online.net> (raw)
In-Reply-To: <vagow98uvk3n$.198v2ms719j4e$.dlg@40tude.net>
On 22.11.11 17:23, Dmitry A. Kazakov wrote:
>> Not sure, are you speaking about DbC (TM)?
>
> I don't care about trade marks and definitions given by reference
> manuals...
Frankly, doing so in some way will help discussing things.
DbC is ...
>> (b) A debugging ("design", "specification", bla-bla) aid leading
>> towards formally proven components where such proofs are possible.
>
> I cannot decipher this, sorry.
Meyer: "Programming is a human activity".
Programmers are led towards a solution during the process of programming.
Depending on the characteristics of the process, then,
programmers will produce different results.
DbC (TM), as a characteristic of a process, leads to products
that lend themselves to proving them correct more than others,
provided this is possible.
>> "An exception is the element's inability to fulfil its contract, for any
>> reason: a hardware failure has occurred, a called routine has failed, a
>> software bug makes it impossible to satisfy the contract."
>
> An exception is a program state. It is not an inability. The behavior in an
> exceptional state is contracted, at least in Ada it is.
OK, erroneous execution. A program's behavior according to the contract.
Yes. But lame.
>> Without those dynamic checks, we wouldn't ever notice a failure?
>
> How would you notice a failure to notice?
Really does not matter. There is no need to require forall-qualification
of every aspect of DbC(TM) when it is not meant to be in a program
if and only if the program (including hardware) is proven to be
100% such-and-such. Impractical.
> The software which behavior is unknown shall never be executed.
But this is impossible, in general!
next prev parent reply other threads:[~2011-11-22 17:46 UTC|newest]
Thread overview: 86+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-11-19 21:14 Generic-Package Elaboration Question / Possible GNAT Bug Shark8
2011-11-19 22:12 ` Robert A Duff
2011-11-19 23:36 ` Shark8
2011-11-20 9:55 ` Dmitry A. Kazakov
2011-11-21 7:25 ` AdaMagica
2011-11-21 8:43 ` Dmitry A. Kazakov
2011-11-21 10:25 ` AdaMagica
2011-11-21 13:08 ` Robert A Duff
2011-11-21 13:50 ` Dmitry A. Kazakov
2011-11-21 19:41 ` Robert A Duff
2011-11-22 8:21 ` Dmitry A. Kazakov
2011-11-21 20:40 ` J-P. Rosen
2011-11-22 8:29 ` Dmitry A. Kazakov
2011-11-22 10:25 ` Georg Bauhaus
2011-11-22 14:32 ` Dmitry A. Kazakov
2011-11-22 15:02 ` Georg Bauhaus
2011-11-22 16:23 ` Dmitry A. Kazakov
2011-11-22 17:46 ` Georg Bauhaus [this message]
2011-11-22 19:15 ` Dmitry A. Kazakov
2011-11-22 21:03 ` Randy Brukardt
2011-11-22 21:26 ` Dmitry A. Kazakov
2011-11-23 0:07 ` Georg Bauhaus
2011-11-23 8:44 ` Dmitry A. Kazakov
2011-11-23 9:32 ` Simon Wright
2011-11-23 9:56 ` Dmitry A. Kazakov
2011-11-23 11:03 ` Georg Bauhaus
2011-11-23 11:13 ` Dmitry A. Kazakov
2011-11-23 11:25 ` Georg Bauhaus
2011-11-23 13:14 ` Dmitry A. Kazakov
2011-11-23 13:59 ` Georg Bauhaus
2011-11-23 14:43 ` Dmitry A. Kazakov
2011-11-23 16:10 ` Georg Bauhaus
2011-11-23 19:51 ` Dmitry A. Kazakov
2011-11-24 0:59 ` Georg Bauhaus
2011-11-24 9:14 ` Dmitry A. Kazakov
2011-11-23 15:12 ` Simon Wright
2011-11-23 19:53 ` Dmitry A. Kazakov
2011-11-24 8:07 ` Simon Wright
2011-11-24 9:27 ` Dmitry A. Kazakov
2011-11-24 10:49 ` Georg Bauhaus
2011-11-24 13:14 ` Dmitry A. Kazakov
2011-11-24 14:31 ` Georg Bauhaus
2011-11-24 16:32 ` Dmitry A. Kazakov
2011-11-24 11:15 ` Brian Drummond
2011-11-24 18:12 ` Simon Wright
2011-11-24 23:52 ` Brian Drummond
2011-11-23 10:35 ` Brian Drummond
2011-11-23 9:54 ` Georg Bauhaus
2011-11-23 10:30 ` Dmitry A. Kazakov
2011-11-23 4:08 ` Yannick Duchêne (Hibou57)
2011-11-23 4:11 ` Yannick Duchêne (Hibou57)
2011-11-22 23:52 ` Georg Bauhaus
2011-11-23 9:04 ` Dmitry A. Kazakov
2011-11-23 11:15 ` Georg Bauhaus
2011-11-23 13:30 ` Dmitry A. Kazakov
2011-11-23 14:42 ` Georg Bauhaus
2011-11-23 19:48 ` Dmitry A. Kazakov
2011-11-24 1:36 ` Georg Bauhaus
2011-11-24 10:52 ` Dmitry A. Kazakov
2011-11-24 11:30 ` Georg Bauhaus
2011-11-24 12:52 ` Dmitry A. Kazakov
2011-11-24 14:45 ` Georg Bauhaus
2011-11-25 9:54 ` Dmitry A. Kazakov
2011-11-24 7:46 ` stefan-lucks
2011-11-24 3:07 ` Shark8
2011-11-24 6:07 ` Yannick Duchêne (Hibou57)
2011-11-24 10:10 ` Dmitry A. Kazakov
2011-11-24 11:15 ` Georg Bauhaus
2011-11-24 22:48 ` Shark8
2011-11-25 9:25 ` Yannick Duchêne (Hibou57)
2011-11-26 21:59 ` Shark8
2011-11-25 9:47 ` Dmitry A. Kazakov
2011-11-25 10:15 ` Georg Bauhaus
2011-11-25 10:51 ` Yannick Duchêne (Hibou57)
2011-11-25 15:45 ` Georg Bauhaus
2011-11-25 16:05 ` Yannick Duchêne (Hibou57)
2011-11-25 16:19 ` Yannick Duchêne (Hibou57)
2011-11-23 3:49 ` Yannick Duchêne (Hibou57)
2011-11-23 8:50 ` Georg Bauhaus
2011-11-23 9:45 ` Yannick Duchêne (Hibou57)
2011-11-23 10:55 ` Georg Bauhaus
2011-11-23 3:20 ` Yannick Duchêne (Hibou57)
2011-11-23 15:05 ` Robert A Duff
2011-11-21 17:00 ` Adam Beneschan
2011-11-23 3:13 ` Yannick Duchêne (Hibou57)
2011-11-24 3:47 ` Shark8
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