From: "Jeffrey R. Carter" <spam.jrcarter.not@acm.nospam.org>
Subject: Re: Containers - nontrivial element access
Date: Wed, 03 Oct 2007 18:49:58 GMT
Date: 2007-10-03T18:49:58+00:00 [thread overview]
Message-ID: <qvRMi.133522$Fc.79348@attbi_s21> (raw)
In-Reply-To: <10xbnt0vkcyeo.5t72qwg3umwd.dlg@40tude.net>
Dmitry A. Kazakov wrote:
>
> How so? Ada abstracts by-value/reference issue away (except for some
> special cases). Whether an in-out parameter is passed by reference or by
> value is not a question of sematic in Ada.
I'm not discussing parameter-passing mechanisms.
> This is IMO utterly wrong. The semantics of swapping element's fields is
> well-defined independently on the way of access. In question in not the
> semantics of, but the syntax sugar, namely an array-like indexing of the
> container.
Swapping was only an example. Essentially, the OP was looking for the
ability to do
People.Element (X).Salary := S;
and have it modify the value in the data structure.
C++ uses reference semantics, so that a modification of a field modifies
the value in the data structure. Ada uses value semantics, so that
modification of a field does not modify the value in the data structure.
--
Jeff Carter
"Spam! Spam! Spam! Spam! Spam! Spam! Spam! Spam!"
Monty Python's Flying Circus
53
next prev parent reply other threads:[~2007-10-03 18:49 UTC|newest]
Thread overview: 43+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-10-01 21:55 Containers - nontrivial element access Maciej Sobczak
2007-10-01 23:52 ` Alex R. Mosteo
2007-10-02 16:40 ` Matthew Heaney
2007-10-02 23:16 ` Alex R. Mosteo
2007-10-02 20:47 ` Maciej Sobczak
2007-10-02 23:23 ` Alex R. Mosteo
2007-10-02 0:39 ` Jeffrey R. Carter
2007-10-02 16:44 ` Matthew Heaney
2007-10-03 0:20 ` Jeffrey R. Carter
2007-10-03 19:40 ` Maciej Sobczak
2007-10-03 19:56 ` Matthew Heaney
2007-10-03 20:21 ` Dmitry A. Kazakov
2007-10-03 22:37 ` Matthew Heaney
2007-10-04 8:06 ` Dmitry A. Kazakov
2007-10-03 22:02 ` Jeffrey R. Carter
2007-10-04 0:16 ` Robert A Duff
2007-10-07 8:41 ` Jacob Sparre Andersen
2007-10-11 19:15 ` Robert A Duff
2007-10-14 4:59 ` Jacob Sparre Andersen
2007-10-14 7:24 ` Dmitry A. Kazakov
2007-10-14 13:49 ` Georg Bauhaus
2007-10-14 15:07 ` Dmitry A. Kazakov
2007-10-02 20:50 ` Maciej Sobczak
2007-10-03 0:22 ` Jeffrey R. Carter
2007-10-03 8:26 ` Dmitry A. Kazakov
2007-10-03 18:49 ` Jeffrey R. Carter [this message]
2007-10-03 19:09 ` Matthew Heaney
2007-10-03 19:15 ` Simon Wright
2007-10-03 19:48 ` Maciej Sobczak
2007-10-03 19:58 ` Matthew Heaney
2007-10-03 19:35 ` Dmitry A. Kazakov
2007-10-02 2:34 ` Randy Brukardt
2007-10-02 16:47 ` Matthew Heaney
2007-10-02 7:23 ` Dmitry A. Kazakov
2007-10-02 16:37 ` Matthew Heaney
2007-10-02 21:02 ` Maciej Sobczak
2007-10-02 22:20 ` Matthew Heaney
2007-10-03 19:59 ` Maciej Sobczak
2007-10-03 22:55 ` Matthew Heaney
2007-10-04 0:22 ` Robert A Duff
2007-10-04 13:01 ` Georg Bauhaus
2007-10-04 14:01 ` Matthew Heaney
2007-10-04 21:58 ` Matthew Heaney
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