From: "Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de>
Subject: Re: Bus error
Date: Fri, 29 Jun 2007 12:17:42 +0200
Date: 2007-06-29T12:14:39+02:00 [thread overview]
Message-ID: <1w6zu5c84zxgr.1s9psi4ohqz0m$.dlg@40tude.net> (raw)
In-Reply-To: mailman.9.1183109010.1644.comp.lang.ada@ada-france.org
On Fri, 29 Jun 2007 11:23:08 +0200, Grein, Christoph (Fa. ESG) wrote:
> Was this feature, which is now lost, often used and very important?
No so oft. One example I know is immutable lists of strings [actually any
unconstrained objects]. We don't have aggregates or tuples of, so let's
emulate them using a limited types:
type List (<>) is limited private;
function "/" (L, R : String) return List;
function "/" (L : List, R : String) return List;
procedure Foo (X : List);
We could call Foo as
Foo ("A" / "B" / "C" / "D");
Let we wanted to prevent the second "/" from copying lists. In order to do
so, we would implement List as a controlled record containing a pointer to
a reference-counted implementation of the list. So "/" would actually
modify target of left argument in hope that it would vanish anyway. It
will, if there were impossible to create a variable of List.
X : List := "A" / "B";
Y : List := X / "C"; -- Surprise!
> Then
> we should consider making it again available in the next Ada version.
Have you an idea of how it could be done? It looks difficult to me.
--
Regards,
Dmitry A. Kazakov
http://www.dmitry-kazakov.de
next prev parent reply other threads:[~2007-06-29 10:17 UTC|newest]
Thread overview: 51+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-06-27 14:23 Bus error Maciej Sobczak
2007-06-27 15:45 ` Georg Bauhaus
2007-06-27 17:19 ` Maciej Sobczak
2007-06-28 1:58 ` Robert A Duff
2007-06-28 20:06 ` Maciej Sobczak
2007-06-28 21:19 ` Robert A Duff
2007-06-29 8:05 ` Maciej Sobczak
2007-06-29 9:42 ` Georg Bauhaus
2007-06-29 16:59 ` Adam Beneschan
2007-06-30 12:33 ` Georg Bauhaus
2007-06-30 2:02 ` Robert A Duff
2007-06-29 8:04 ` Dmitry A. Kazakov
2007-06-29 9:23 ` AW: " Grein, Christoph (Fa. ESG)
2007-06-29 10:17 ` Dmitry A. Kazakov [this message]
2007-06-27 20:02 ` Anh Vo
2007-06-27 20:48 ` Maciej Sobczak
2007-06-28 2:01 ` Robert A Duff
[not found] <0367891DA5DA7E408D42A860FA002F44B0CC48@sma2901.cr.eurocopter.corp>
2007-06-29 9:35 ` AW: " Duncan Sands
2007-06-29 12:55 ` Dmitry A. Kazakov
2007-06-29 15:37 ` Markus E Leypold
2007-06-29 15:44 ` Georg Bauhaus
2007-06-29 20:07 ` Dmitry A. Kazakov
2007-06-30 1:37 ` Robert A Duff
2007-06-30 8:44 ` Dmitry A. Kazakov
2007-06-30 11:52 ` Georg Bauhaus
2007-06-30 13:16 ` Georg Bauhaus
2007-06-30 14:31 ` Dmitry A. Kazakov
2007-06-30 18:07 ` Georg Bauhaus
2007-06-30 19:31 ` Robert A Duff
2007-07-01 9:07 ` Dmitry A. Kazakov
2007-06-30 15:40 ` Robert A Duff
2007-06-30 17:54 ` Georg Bauhaus
2007-07-02 8:01 ` Jean-Pierre Rosen
2007-07-02 12:00 ` Dmitry A. Kazakov
2007-07-02 12:30 ` Jean-Pierre Rosen
2007-07-02 14:22 ` Robert A Duff
2007-06-30 13:14 ` Georg Bauhaus
2007-06-30 14:31 ` Dmitry A. Kazakov
2007-06-30 15:34 ` Robert A Duff
2007-07-01 8:34 ` Dmitry A. Kazakov
2007-07-01 15:39 ` Robert A Duff
2007-07-01 19:41 ` Dmitry A. Kazakov
2007-06-30 15:29 ` Robert A Duff
2007-06-30 17:41 ` Georg Bauhaus
2007-06-30 13:31 ` Markus E Leypold
2007-07-02 0:16 ` Robert A Duff
-- strict thread matches above, loose matches on Subject: below --
1990-08-27 23:48 BUS ERROR J o s e D u a r t e ! ! !
1990-08-16 14:52 saharbaugh%roo.dnet
1990-08-13 21:11 J o s e D u a r t e !!!
1990-08-10 12:32 bus error saharbaugh%roo.dnet
1990-08-09 14:50 saharbaugh%roo.dnet
1990-08-10 21:38 ` Chuck Peterson
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