From: "Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de>
Subject: Re: Why constructing functions is a mess [was Language lawyer question: task activation
Date: Mon, 2 Mar 2009 18:46:43 +0100
Date: 2009-03-02T18:46:47+01:00 [thread overview]
Message-ID: <1p6sf3ykej2ls.10jmdonrmif5h.dlg@40tude.net> (raw)
In-Reply-To: 49ac0595$0$31344$9b4e6d93@newsspool4.arcor-online.net
On Mon, 02 Mar 2009 17:13:09 +0100, Georg Bauhaus wrote:
> Dmitry A. Kazakov schrieb:
>
>> A derived type works fine:
>>
>> type My_Plant is new Power_Plant with null record;
>> function Create return My_Plant is
>> begin
>> return (Power_Plant'(Create ("my plant")) with null record);
>> end Create;
>
>> Now, the point is that this model of construction does not work with
>> abstract types because of fundamental reasons. It is not (<>) which is
>> broken, but the construction model.
>
> OK, got your point, sorry for being so dense.
No, you still have not. The problem is that the idea of constructing
functions replacing constructors is broken. The example I presented is just
one consequence of this flaw.
> Should the following work for unconstrained abstract Power_Plant?
> (some day, e.g.
> http://gcc.gnu.org/bugzilla/show_bug.cgi?id=34507 )
It is not a compiler bug. It is a language bug. Besides, I have GNAT Pro.
> Would you consider dropping a note on AI05-067 to the ARG list?
Thank you for illustrating my point. This AI perfectly illustrates were
assumptions like 2+2=5 lead:
COMING SOON: !! Mutating objects and Spider-Man !!
--
Regards,
Dmitry A. Kazakov
http://www.dmitry-kazakov.de
next prev parent reply other threads:[~2009-03-02 17:46 UTC|newest]
Thread overview: 44+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-02-19 17:37 Language lawyer question: task activation Adam Beneschan
2009-02-19 17:57 ` Dmitry A. Kazakov
2009-02-19 23:57 ` Robert A Duff
2009-02-20 13:22 ` Dmitry A. Kazakov
2009-02-23 7:36 ` Jean-Pierre Rosen
2009-02-20 5:43 ` christoph.grein
2009-02-20 10:44 ` Dmitry A. Kazakov
2009-02-20 11:14 ` christoph.grein
2009-02-20 12:07 ` mockturtle
2009-02-20 13:22 ` Dmitry A. Kazakov
2009-02-20 16:45 ` Georg Bauhaus
2009-02-20 18:41 ` Dmitry A. Kazakov
2009-02-20 22:19 ` Georg Bauhaus
2009-02-21 8:31 ` Dmitry A. Kazakov
2009-02-27 23:29 ` Randy Brukardt
2009-02-28 8:13 ` Why constructing functions is a mess [was Language lawyer question: task activation (was: Language lawyer question: task activation)) Dmitry A. Kazakov
2009-02-28 12:20 ` Why constructing functions is a mess [was Language lawyer question: task activation Georg Bauhaus
2009-02-28 13:45 ` Dmitry A. Kazakov
2009-02-28 15:36 ` Georg Bauhaus
2009-02-28 16:22 ` Dmitry A. Kazakov
2009-02-28 17:19 ` Georg Bauhaus
2009-02-28 17:48 ` Dmitry A. Kazakov
2009-02-28 18:39 ` Georg Bauhaus
2009-02-28 20:17 ` Dmitry A. Kazakov
2009-03-02 16:13 ` Georg Bauhaus
2009-03-02 17:46 ` Dmitry A. Kazakov [this message]
2009-03-02 18:50 ` Georg Bauhaus
2009-03-02 21:02 ` Dmitry A. Kazakov
2009-03-03 7:04 ` christoph.grein
2009-03-03 8:45 ` Dmitry A. Kazakov
2009-03-03 9:27 ` christoph.grein
2009-03-03 9:34 ` Dmitry A. Kazakov
2009-03-03 19:13 ` Pascal Obry
2009-03-04 5:29 ` christoph.grein
2009-03-04 8:32 ` Dmitry A. Kazakov
2009-03-04 9:05 ` christoph.grein
2009-03-04 9:47 ` Dmitry A. Kazakov
2009-02-28 23:12 ` Maciej Sobczak
2009-03-01 8:23 ` Dmitry A. Kazakov
2009-02-19 23:54 ` Robert A Duff
2009-02-20 10:18 ` Robert_Matthews
2009-02-20 10:34 ` christoph.grein
2009-02-20 14:16 ` Robert A Duff
2009-02-20 16:57 ` Robert_Matthews
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