From: Hyman Rosen <hyrosen@mail.com>
Subject: Re: What's wrong with C++?
Date: Thu, 17 Feb 2011 16:45:24 -0500
Date: 2011-02-17T16:45:24-05:00 [thread overview]
Message-ID: <4d5d96f8$0$17330$882e7ee2@usenet-news.net> (raw)
In-Reply-To: <87lj1ez6rj.fsf@ludovic-brenta.org>
On 2/17/2011 4:32 PM, Ludovic Brenta wrote:
> Hyman Rosen writes on comp.lang.ada:
>> How is that automatic? It is explicitly converted back through
>> DamageType::E( expression )
>
> Because, unless my C++ is really rusty, this is not a conversion. It is
> an explicit call to the (implicitly defined) copy constructor
>
> DamageType::E (DamageType::E&)
>
> where the parameter, of type int, is automatically converted to
> DamageType::E&.
>
> An explicit type conversion would look like:
>
> (DamageType::E) expression
Sorry, but your C++ is really rusty. The two forms are equivalent.
5.2.3/1 says
A simple-type-specifier (7.1.5) followed by a parenthesized
expression-list constructs a value of the specified type given
the expression list. If the expression list is a single
expression, the type conversion expression is equivalent (in
definedness, and if defined in meaning) to the corresponding
cast expression (5.4).
>
>>> Except that the value of what_my_dragon_can_do is not one of the
>>> values defined in the type.
>>
>> Once again, this is a design decision made by those who brought
>> enumerations into C. The value an enumeration may take is not
>> restricted to being one of the enumerators because the language wants
>> to support using enumeration literals as bitmasks. You may not like
>> it, but this use is correct C++.
>
> Agreed. That was my point: C++ is a dangerous language, by design.
>
next prev parent reply other threads:[~2011-02-17 21:45 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
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 [this message]
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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