From: Adam Beneschan <adam@irvine.com>
Subject: Re: Extending discriminant types
Date: Thu, 20 Nov 2008 16:29:00 -0800 (PST)
Date: 2008-11-20T16:29:00-08:00 [thread overview]
Message-ID: <3f77e490-2f54-4441-828e-6c6e68d245df@a17g2000prm.googlegroups.com> (raw)
In-Reply-To: NZlVk.36083$_Y1.11594@bgtnsc05-news.ops.worldnet.att.net
On Nov 20, 2:59 pm, a...@anon.org (anon) wrote:
> First, the second specification package that I use was written by
> "Pascal Leroy". another editor of the Ada 2005 RM. "Randy Brukardt"
> skip this topic.
>
> QUOTE
> Our compiler currently rejects the following code fragment because it
> complains that the overriding "=" is not subtype conformant with the
> inherited "=" (3.9.2(10)):
>
> package P is
> type T is tagged private;
> function "=" (Left, Right : T'Base) return Boolean;
> private
> type T is tagged null record;
> end P;
>
> T is a constrained subtype as per 3.2(9), so as far as I understand, T is
> different from the "T italic" used in 4.5.2(7).
>
> I hope that there is flaw in my reasoning, because if it is correct, it
> looks like we have a pretty severe problem...
>
> Pascal
> UNQUOTE
>
> And since both RM 95 and RM 2005, do not clarify that the "Base" attribute
> is for scalar types only, then you must assume that the "Base' attribute
> can apply to other types as well.
The Annotated Ada Reference Manual does clarify this, though. See
AARM 3.5(63.a). http://www.adaic.org/standards/05aarm/html/AA-3-5.html
Else either "Pascal Leroy" or may be
> "Randy Brukardt" would have correct the misunderstanding of this
> attribute, especially since, Pascal implied the understanding in the
> first place by use of his example.
Either that, or both Pascal and Randy are human and both erred by
missing the problem. It happens.
-- Adam
next prev parent reply other threads:[~2008-11-21 0:29 UTC|newest]
Thread overview: 68+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-11-15 9:16 Extending discriminant types Stefan Bellon
2008-11-15 18:50 ` Jeffrey R. Carter
2008-11-17 16:30 ` Adam Beneschan
2008-11-18 11:02 ` christoph.grein
2008-11-18 23:24 ` Adam Beneschan
2008-11-19 9:49 ` anon
2008-11-19 10:15 ` christoph.grein
2008-11-19 19:19 ` Georg Bauhaus
2008-11-19 11:38 ` Martin
2008-11-20 7:21 ` anon
2008-11-20 8:30 ` christoph.grein
2008-11-20 8:36 ` Ludovic Brenta
2008-11-20 11:45 ` Georg Bauhaus
2008-11-20 11:46 ` Georg Bauhaus
2008-11-20 23:01 ` anon
2008-11-21 11:54 ` Ludovic Brenta
2008-11-20 14:03 ` Dmitry A. Kazakov
2008-11-20 15:03 ` Robert A Duff
2008-11-20 15:57 ` Stefan Bellon
2008-11-21 0:32 ` Adam Beneschan
2008-11-20 16:11 ` Adam Beneschan
2008-11-20 22:59 ` anon
2008-11-21 0:29 ` Adam Beneschan [this message]
2008-11-21 7:25 ` anon
2008-11-21 9:19 ` Jean-Pierre Rosen
2008-11-21 10:11 ` christoph.grein
2008-11-21 12:00 ` Ludovic Brenta
2008-11-21 22:31 ` anon
2008-11-22 0:18 ` Stefan Bellon
2008-11-23 4:06 ` anon
2008-11-23 5:39 ` Georg Bauhaus
2008-11-23 8:00 ` anon
2008-11-24 10:08 ` Georg Bauhaus
2008-11-24 22:16 ` anon
2008-11-25 10:37 ` Martin
2008-11-25 11:24 ` Georg Bauhaus
2008-11-25 20:49 ` Jeffrey R. Carter
2008-11-25 21:01 ` Adam Beneschan
2008-11-25 22:09 ` Georg Bauhaus
2008-11-25 22:33 ` Jeffrey R. Carter
2008-11-26 0:58 ` Adam Beneschan
2008-11-26 1:45 ` Jeffrey R. Carter
2008-11-26 9:31 ` Martin
2008-11-26 9:38 ` Stefan Bellon
2008-11-26 9:48 ` Martin
2008-11-26 10:16 ` Stefan Bellon
2008-11-26 11:05 ` Ludovic Brenta
2008-11-26 11:33 ` Stefan Bellon
2008-11-26 15:49 ` Adam Beneschan
2008-11-26 16:15 ` Ludovic Brenta
2008-11-26 11:10 ` Niklas Holsti
2008-11-23 8:48 ` Compiler quality (was: Extending discriminant types) Ludovic Brenta
2008-11-24 23:33 ` anon
2008-11-25 6:54 ` christoph.grein
2008-11-25 10:01 ` Ludovic Brenta
2008-11-26 23:34 ` anon
2008-11-27 10:24 ` Compiler quality Georg Bauhaus
2008-11-27 14:46 ` Ludovic Brenta
2008-11-28 9:13 ` Martin
2008-11-28 10:28 ` Georg Bauhaus
2008-12-02 3:51 ` Randy Brukardt
2008-11-22 13:10 ` Extending discriminant types Gautier
2008-11-24 8:24 ` christoph.grein
2008-11-21 6:11 ` christoph.grein
2008-11-21 21:12 ` Jeffrey R. Carter
2008-11-22 16:41 ` sjw
2008-11-21 11:44 ` Martin
2008-11-20 9:55 ` Martin
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