From: "Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de>
Subject: Re: procedural vs object oriented
Date: Fri, 28 Apr 2006 09:46:22 +0200
Date: 2006-04-28T09:46:22+02:00 [thread overview]
Message-ID: <6hbsa2y01esi.1hom0owrsl51u.dlg@40tude.net> (raw)
In-Reply-To: 3siq2e.3fk.ln@hunter.axlog.fr
On Thu, 27 Apr 2006 16:01:41 +0200, Jean-Pierre Rosen wrote:
> Dmitry A. Kazakov a �crit :
>> Well, no:
>>
>> if Read (File) then
>> Foo;
>> else
>> Bar;
>> end if;
>>
>> The uncertainty of a dispatching call is one of the context, exactly as in
>> the example above. Provided, that there is nothing uncertain in how
>> dispatching works or what potential targets do.
>>
> Of course, you can assume that every dispatching call is equivalent to a
> case statement over all possibly redefined primitives. That works well
> for one level.
>
> But if you consider that each called primitive may in turn redispatch
> internally, you end up with a combinatorial explosion.
Ah, but redispatch is luckily not allowed in Ada. The programmer has to
explicitly convert the type to the class. That should not slip through peer
review.
[ I would even disallow it altogether. There is your trick for such
things.]
> In theory, yes, the analysis can be performed. In practice, no.
Yes, but it is a sort of "postmortem" or C-ish approach. There is nothing
fundamentally evil in dispatching if LSP problematic is supported. It is a
question of the language and tools. Something like SPARK could change it.
--
Regards,
Dmitry A. Kazakov
http://www.dmitry-kazakov.de
next prev parent reply other threads:[~2006-04-28 7:46 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-04-26 8:16 procedural vs object oriented Ananth the Boss
2006-04-26 9:17 ` Jean-Pierre Rosen
2006-04-26 17:44 ` Jeffrey R. Carter
2006-04-26 12:52 ` Dmitry A. Kazakov
2006-04-27 1:33 ` bh
2006-04-27 5:22 ` Ludovic Brenta
2006-04-27 7:36 ` Dmitry A. Kazakov
2006-04-27 10:42 ` Ludovic Brenta
2006-04-27 11:07 ` Maciej Sobczak
2006-04-27 12:03 ` Ludovic Brenta
2006-04-27 17:19 ` Pascal Obry
2006-04-27 15:51 ` Georg Bauhaus
2006-04-27 12:45 ` Dmitry A. Kazakov
2006-04-27 13:20 ` Ludovic Brenta
2006-04-27 14:24 ` Alex R. Mosteo
2006-04-27 15:17 ` Ludovic Brenta
2006-04-27 16:11 ` Alex R. Mosteo
2006-04-27 20:19 ` Ludovic Brenta
2006-04-27 14:01 ` Jean-Pierre Rosen
2006-04-28 7:46 ` Dmitry A. Kazakov [this message]
2006-04-27 15:38 ` Peter Amey
2006-04-27 20:20 ` Ludovic Brenta
2006-04-27 6:55 ` Ananth the Boss
replies disabled
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox