From: Ludovic Brenta <ludovic@ludovic-brenta.org>
Subject: Re: What's wrong with C++?
Date: Thu, 17 Feb 2011 20:55:18 +0100
Date: 2011-02-17T20:55:18+01:00 [thread overview]
Message-ID: <87vd0izba1.fsf@ludovic-brenta.org> (raw)
In-Reply-To: 4d5d791f$0$17330$882e7ee2@usenet-news.net
Hyman Rosen <hyrosen@mail.com> writes:
> On 2/17/2011 1:53 PM, Ludovic Brenta wrote:
>> No, it only means that enumerations in C++ really are integers
>> and not enumerations.
>
> This was a choice made by the people who incorporated enumerations
> into C. They felt it important that enumerations should be usable
> in the style of bitmasks. And what does it mean for something to be
> "really an integer"?
Simple: integers have arithmetic, enumeration values don't.
> Ada 'Pos and 'Val attributes certainly give the illusion that Ada
> enumerators are integers too!
If you mean to say that Ada provides features for unsafe programming,
then if course we all knew that. Ada also has overlays and machine code
insertions that allow the programmer to do anything they please.
Now try this and see your "illusion" shattered by reality:
type E is (A, B, C);
B : E := E'Val (E'Pos (A) + E'Pos (C)); -- Constraint_Error
In this respect like in many others, Ada is safe by default and unsafe
if the programmer really wants that.
--
Ludovic Brenta.
next prev parent reply other threads:[~2011-02-17 19:55 UTC|newest]
Thread overview: 155+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-02-16 17:37 What's wrong with C++? KK6GM
2011-02-16 17:58 ` Hyman Rosen
2011-02-16 18:18 ` KK6GM
2011-02-16 20:25 ` Chris Moore
2011-02-20 4:47 ` Chuck
2011-02-20 4:45 ` Chuck
2011-02-16 19:35 ` Robert A Duff
2011-02-16 20:32 ` Hyman Rosen
2011-02-16 23:31 ` Georg Bauhaus
2011-02-16 20:03 ` Fritz Wuehler
2011-02-16 20:09 ` Hyman Rosen
2011-02-17 17:39 ` Paul Colin Gloster
2011-03-01 15:52 ` Martin Krischik
2011-02-16 23:27 ` Peter C. Chapin
2011-02-16 18:32 ` Pascal Obry
2011-02-16 19:09 ` Hyman Rosen
2011-02-16 19:36 ` KK6GM
2011-02-16 20:07 ` Hyman Rosen
2011-02-17 18:48 ` Yannick Duchêne (Hibou57)
2011-02-17 18:53 ` Ludovic Brenta
2011-02-17 19:14 ` Yannick Duchêne (Hibou57)
2011-02-17 19:38 ` Hyman Rosen
2011-02-17 19:55 ` Ludovic Brenta [this message]
2011-02-17 20:11 ` Hyman Rosen
2011-02-17 20:51 ` Ludovic Brenta
2011-02-17 21:03 ` Hyman Rosen
2011-02-17 21:32 ` Ludovic Brenta
2011-02-17 21:45 ` Hyman Rosen
2011-02-17 21:07 ` Jeffrey Carter
2011-02-17 20:32 ` Yannick Duchêne (Hibou57)
2011-02-17 20:37 ` Hyman Rosen
2011-02-17 22:54 ` J-P. Rosen
2011-02-17 23:02 ` Hyman Rosen
2011-02-17 23:03 ` Hyman Rosen
2011-02-17 23:17 ` J-P. Rosen
2011-02-17 23:27 ` Hyman Rosen
2011-02-18 6:56 ` J-P. Rosen
2011-02-18 19:58 ` Edward Fish
2011-02-18 20:04 ` Hyman Rosen
2011-02-18 20:10 ` Edward Fish
2011-02-18 20:27 ` Hyman Rosen
2011-02-18 22:00 ` Edward Fish
2011-02-17 19:34 ` Hyman Rosen
2011-02-16 20:49 ` Nasser M. Abbasi
2011-02-16 21:12 ` Hyman Rosen
2011-02-16 23:07 ` J-P. Rosen
2011-02-16 23:23 ` Hyman Rosen
2011-02-17 20:51 ` Yannick Duchêne (Hibou57)
2011-02-17 20:57 ` Hyman Rosen
2011-02-16 23:35 ` Peter C. Chapin
2011-02-17 3:35 ` Shark8
2011-02-17 20:54 ` Yannick Duchêne (Hibou57)
2011-02-17 22:19 ` Shark8
2011-02-17 11:04 ` J-P. Rosen
2011-02-17 11:52 ` Georg Bauhaus
2011-02-17 14:30 ` J-P. Rosen
2011-02-17 16:29 ` Hyman Rosen
2011-02-17 17:32 ` Peter C. Chapin
2011-02-18 6:54 ` Chuck
2011-02-17 21:04 ` Yannick Duchêne (Hibou57)
2011-02-18 7:02 ` Chuck
2011-02-17 22:50 ` J-P. Rosen
2011-02-17 23:00 ` Hyman Rosen
2011-02-17 23:08 ` J-P. Rosen
2011-02-19 15:24 ` Marco
2011-02-19 16:39 ` Frank J. Lhota
2011-02-19 19:51 ` Nasser M. Abbasi
2011-02-19 22:36 ` Anonymous
2011-02-19 22:45 ` Nasser M. Abbasi
2011-02-20 0:55 ` Nomen Nescio
2011-02-20 1:51 ` Nasser M. Abbasi
2011-02-20 9:49 ` Vinzent Hoefler
2011-02-18 7:07 ` Chuck
2011-02-17 21:00 ` Yannick Duchêne (Hibou57)
2011-02-17 22:55 ` Georg Bauhaus
2011-02-18 3:09 ` Yannick Duchêne (Hibou57)
2011-02-18 9:37 ` Georg Bauhaus
2011-02-18 11:34 ` richard
2011-02-18 11:56 ` Georg Bauhaus
2011-02-18 13:26 ` richard
2011-02-18 14:15 ` Georg Bauhaus
2011-02-17 20:58 ` Yannick Duchêne (Hibou57)
2011-02-18 7:11 ` Chuck
2011-02-18 17:17 ` Paul Colin Gloster
2011-02-20 4:35 ` Chuck
2011-02-18 7:16 ` Chuck
2011-02-18 7:27 ` Chuck
2011-02-18 7:28 ` Chuck
2011-02-17 3:41 ` Mike Sieweke
2011-02-17 13:31 ` Peter C. Chapin
2011-02-18 5:15 ` Mike Sieweke
2011-02-18 6:41 ` Chuck
2011-02-18 6:39 ` Chuck
2011-02-17 15:30 ` Hyman Rosen
2011-02-17 17:31 ` Martin
2011-02-17 19:12 ` Yannick Duchêne (Hibou57)
2011-02-17 18:51 ` Yannick Duchêne (Hibou57)
2011-02-18 6:45 ` Chuck
2011-02-18 6:38 ` Chuck
2011-02-17 8:31 ` Ludovic Brenta
2011-02-17 9:02 ` Dmitry A. Kazakov
2011-02-17 13:38 ` Peter C. Chapin
2011-02-17 16:12 ` Dmitry A. Kazakov
2011-02-17 16:25 ` Hyman Rosen
2011-02-17 17:46 ` Georg Bauhaus
2011-02-17 18:09 ` Hyman Rosen
2011-02-18 5:59 ` Chuck
2011-02-17 18:22 ` Dmitry A. Kazakov
2011-02-18 6:23 ` Chuck
2011-02-17 17:27 ` Peter C. Chapin
2011-02-17 18:46 ` Dmitry A. Kazakov
2011-02-18 6:15 ` Chuck
2011-02-18 13:37 ` Peter C. Chapin
2011-02-20 4:33 ` Chuck
2011-02-17 19:29 ` Yannick Duchêne (Hibou57)
2011-02-18 9:17 ` Dmitry A. Kazakov
2011-02-17 19:34 ` Yannick Duchêne (Hibou57)
2011-02-18 9:41 ` Dmitry A. Kazakov
2011-02-17 19:25 ` Yannick Duchêne (Hibou57)
2011-02-18 6:20 ` Chuck
2011-02-17 19:19 ` Yannick Duchêne (Hibou57)
2011-02-17 20:50 ` Georg Bauhaus
2011-02-17 21:08 ` Yannick Duchêne (Hibou57)
2011-02-18 0:13 ` Georg Bauhaus
2011-02-18 6:12 ` Chuck
2011-02-18 7:47 ` Yannick Duchêne (Hibou57)
2011-02-18 6:07 ` Chuck
2011-02-18 17:38 ` Paul Colin Gloster
2011-02-17 11:51 ` Ludovic Brenta
2011-02-17 20:47 ` Yannick Duchêne (Hibou57)
2011-02-20 4:41 ` Chuck
2011-02-20 10:28 ` Brian Drummond
2011-02-20 14:48 ` Britt Snodgrass
2011-10-04 20:51 ` Yannick Duchêne (Hibou57)
2011-10-04 21:00 ` Yannick Duchêne (Hibou57)
2011-10-05 1:53 ` Peter C. Chapin
2011-10-05 2:13 ` Yannick Duchêne (Hibou57)
2011-10-05 4:48 ` Jeffrey Carter
2011-10-05 6:21 ` Yannick Duchêne (Hibou57)
2011-10-05 6:39 ` Jeffrey Carter
2011-10-05 5:13 ` Niklas Holsti
2011-10-05 6:33 ` Yannick Duchêne (Hibou57)
2011-10-05 6:45 ` Jeffrey Carter
2011-10-08 1:36 ` Randy Brukardt
2011-10-08 8:39 ` Niklas Holsti
2011-10-08 23:11 ` Yannick Duchêne (Hibou57)
2011-10-06 13:19 ` Peter C. Chapin
2011-10-06 14:01 ` Hyman Rosen
2011-10-08 1:24 ` Randy Brukardt
2011-10-08 13:14 ` Peter C. Chapin
2011-10-08 17:49 ` Jeffrey Carter
2011-10-08 23:55 ` Yannick Duchêne (Hibou57)
2011-10-10 13:31 ` Paul Colin Gloster
2011-10-11 7:45 ` Yannick Duchêne (Hibou57)
2011-10-11 9:40 ` SPARK and other provers (Was: Re: What's wrong with C++?) Phil Thornley
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