From: "Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de>
Subject: Re: discriminant questions
Date: Tue, 20 Sep 2011 09:38:15 +0200
Date: 2011-09-20T09:38:15+02:00 [thread overview]
Message-ID: <1b7pl1piwc3hl.7q9fyyq8h3m7.dlg@40tude.net> (raw)
In-Reply-To: j58l43$jcp$1@munin.nbi.dk
On Mon, 19 Sep 2011 19:01:05 -0500, Randy Brukardt wrote:
> "Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de> wrote in message
> news:148cxoyabima2.16mz6xwdph2hj.dlg@40tude.net...
>> On Sat, 17 Sep 2011 15:55:15 -0700 (PDT), ytomino wrote:
> ...
>>> This code is same as:
>>>
>>> type Reference_Type (Element : access Integer) is null record;
>>
>> It is not same, and I don't see the purpose of using this construct. In
>> any case it cannot serve as a good basis for smart pointers.
>
> The "good reason" for using this construct (beyond the obvious one of being
> able to use the "implicit dereference" construct is one of lifetime. The
> access discriminant of this object has the same lifetime as the enclosing
> object; if that object is returned from a function, that is very short.
That is why this cannot be used for smart pointers. For them the
relationship is exactly opposite: Element always outlive the pointer except
the last one.
--
Regards,
Dmitry A. Kazakov
http://www.dmitry-kazakov.de
next prev parent reply other threads:[~2011-09-20 7:38 UTC|newest]
Thread overview: 89+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-09-17 16:30 discriminant questions ytomino
2011-09-17 17:19 ` Dmitry A. Kazakov
2011-09-17 17:46 ` ytomino
2011-09-17 19:41 ` Dmitry A. Kazakov
2011-09-17 22:55 ` ytomino
2011-09-18 8:50 ` Dmitry A. Kazakov
2011-09-18 10:54 ` ytomino
2011-09-18 11:35 ` Dmitry A. Kazakov
2011-09-18 12:41 ` ytomino
2011-09-18 13:17 ` Dmitry A. Kazakov
2011-09-18 16:22 ` ytomino
2011-09-18 16:32 ` ytomino
2011-09-18 18:15 ` Dmitry A. Kazakov
2011-09-18 23:44 ` ytomino
2011-09-19 7:27 ` Dmitry A. Kazakov
2011-09-18 14:43 ` Dmitry A. Kazakov
2011-09-18 16:46 ` Robert A Duff
2011-09-18 18:01 ` Dmitry A. Kazakov
2011-09-18 19:20 ` Maciej Sobczak
2011-09-19 7:39 ` Dmitry A. Kazakov
2011-09-19 20:00 ` Maciej Sobczak
2011-09-20 7:33 ` Dmitry A. Kazakov
2011-09-20 15:45 ` Maciej Sobczak
2011-09-20 16:48 ` Dmitry A. Kazakov
2011-09-20 20:19 ` Maciej Sobczak
2011-09-21 7:48 ` Dmitry A. Kazakov
2011-09-21 20:51 ` Maciej Sobczak
2011-09-22 8:07 ` Dmitry A. Kazakov
2011-09-22 20:57 ` Maciej Sobczak
2011-09-23 7:59 ` Dmitry A. Kazakov
2011-09-23 10:57 ` Georg Bauhaus
2011-09-23 22:30 ` Randy Brukardt
2011-09-23 22:50 ` Randy Brukardt
2011-09-24 6:46 ` Dmitry A. Kazakov
2011-09-26 22:48 ` Randy Brukardt
2011-09-27 8:10 ` Dmitry A. Kazakov
2011-09-27 10:18 ` Georg Bauhaus
2011-09-27 12:14 ` Dmitry A. Kazakov
2011-09-27 15:11 ` Georg Bauhaus
2011-09-27 15:38 ` Dmitry A. Kazakov
2011-09-27 18:06 ` Georg Bauhaus
2011-09-27 19:06 ` Dmitry A. Kazakov
2011-09-29 0:01 ` Georg Bauhaus
2011-09-29 8:26 ` Dmitry A. Kazakov
2011-09-30 1:24 ` Randy Brukardt
2011-09-30 8:10 ` Dmitry A. Kazakov
2011-09-30 10:07 ` Georg Bauhaus
2011-09-30 12:38 ` Dmitry A. Kazakov
2011-09-30 17:40 ` Georg Bauhaus
2011-09-30 18:55 ` Dmitry A. Kazakov
2011-09-23 9:23 ` Stephen Leake
2011-09-23 9:48 ` Dmitry A. Kazakov
2011-09-23 22:42 ` Randy Brukardt
2011-09-24 6:56 ` Dmitry A. Kazakov
2011-09-26 22:43 ` Randy Brukardt
2011-09-24 10:47 ` Stephen Leake
2011-09-24 12:54 ` Simon Wright
2011-09-24 14:46 ` Dmitry A. Kazakov
2011-09-24 16:21 ` Simon Wright
2011-09-24 16:43 ` Dmitry A. Kazakov
2011-09-22 2:52 ` Randy Brukardt
2011-09-22 8:11 ` Dmitry A. Kazakov
2011-09-20 0:01 ` Randy Brukardt
2011-09-20 7:38 ` Dmitry A. Kazakov [this message]
2011-09-20 11:11 ` AdaMagica
2011-09-20 12:09 ` Dmitry A. Kazakov
2011-09-20 12:31 ` AdaMagica
2011-09-20 12:57 ` Dmitry A. Kazakov
2011-09-20 23:28 ` ytomino
2011-09-21 5:03 ` AdaMagica
2011-09-21 8:08 ` Dmitry A. Kazakov
2011-09-21 10:03 ` Georg Bauhaus
2011-09-21 10:29 ` Dmitry A. Kazakov
2011-09-22 3:21 ` Randy Brukardt
2011-09-22 3:05 ` Randy Brukardt
2011-09-19 23:35 ` Randy Brukardt
2011-09-20 21:39 ` ytomino
2011-09-22 3:32 ` Randy Brukardt
2011-09-18 16:32 ` ytomino
2011-09-19 14:46 ` ytomino
2011-09-19 15:14 ` Dmitry A. Kazakov
2011-09-19 17:49 ` ytomino
2011-09-20 7:29 ` Georg Bauhaus
2011-09-20 19:50 ` ytomino
2011-09-20 8:08 ` Dmitry A. Kazakov
2011-09-20 18:47 ` ytomino
2011-09-21 8:16 ` Dmitry A. Kazakov
2011-09-21 9:55 ` ytomino
2011-09-22 3:26 ` Randy Brukardt
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