From: "Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de>
Subject: Re: Generic-Package Elaboration Question / Possible GNAT Bug.
Date: Sun, 20 Nov 2011 10:55:54 +0100
Date: 2011-11-20T10:55:54+01:00 [thread overview]
Message-ID: <fe29npj98k5s$.1vzwcva8q22hk.dlg@40tude.net> (raw)
In-Reply-To: 4295dc09-43de-4557-a095-fc108359f27f@y42g2000yqh.googlegroups.com
On Sat, 19 Nov 2011 15:36:33 -0800 (PST), Shark8 wrote:
> On Nov 19, 4:12�pm, Robert A Duff <bobd...@shell01.TheWorld.com>
> wrote:
>> In general, the design of Ada is that if a generic body is legal,
>> then every possible instance is legal (so the compiler need not
>> check the instances). �The design of C++ templates is very different
>> in this regard!
>
> *nod* -- I understand that Ada's generics are quite different than C+
> +'s templates. Some of the reasons I've come across make a whole lot
> more sense to me for the Ada model than the C++, this "every possible
> instance" restriction is one such case. Who would want a system where
> a 'general' feature only worked for *some* instances. {Meaning the
> general feature wasn't actually .}
I don't know if Ada keeps that promise for generic bodies, but it certainly
does not for the specifications. Generic contracts are too weak for that.
Example:
generic
type T is tagged private;
package Legal is
type S is new T with null record;
not overriding procedure Foo (X : in out S);
end Legal;
This and the body would successfully compile ignoring the fact that there
might exist tagged types with a primitive operation named Foo.
--
Regards,
Dmitry A. Kazakov
http://www.dmitry-kazakov.de
next prev parent reply other threads:[~2011-11-20 9:55 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 [this message]
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
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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