From: "Jean-Pierre Rosen" <rosen.adalog@wanadoo.fr>
Subject: Re: Parameter Modes, In In Out and Out
Date: Sat, 6 Jan 2001 17:21:03 +0100
Date: 2001-01-06T16:32:26+00:00 [thread overview]
Message-ID: <937haq$mmh$1@wanadoo.fr> (raw)
In-Reply-To: Zmt56.57012$ca6.937797@news6-win.server.ntlworld.com
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"i.a.mcleod" <i.a.mcleod@ntlworld.com> a �crit dans le message news: Zmt56.57012$ca6.937797@news6-win.server.ntlworld.com...
> What is the difference between In Out and Out parameters according to the
> way compilers handle these. I can't see any difference. An out parameter
> is still taken in. I am confused by this anyone help?
>
There is a huge difference. Consider:
procedure P (X : out Some_Type);
By looking at the specification (NOT the body), I can tell that the procedure cannot rely on the previous value of the parameter,
and therefore that it is safe to call it to initialize an unitialized variable, whose value can be invalid. I could not assume this
with an in out parameter.
--
---------------------------------------------------------
J-P. Rosen (Rosen.Adalog@wanadoo.fr)
Visit Adalog's web site at http://pro.wanadoo.fr/adalog
next prev parent reply other threads:[~2001-01-06 16:21 UTC|newest]
Thread overview: 79+ messages / expand[flat|nested] mbox.gz Atom feed top
2001-01-06 0:11 Parameter Modes, In In Out and Out i.a.mcleod
2001-01-06 4:58 ` tmoran
2001-01-06 17:06 ` Robert Dewar
2001-01-06 19:50 ` tmoran
2001-01-06 20:31 ` Robert Dewar
2001-01-07 1:59 ` John English
2001-01-07 3:51 ` Robert Dewar
2001-01-08 12:06 ` dmitry6243
2001-01-09 4:32 ` Robert Dewar
2001-01-09 10:05 ` dmitry6243
2001-01-09 4:35 ` Robert Dewar
2001-01-09 9:58 ` dmitry6243
2001-01-09 14:13 ` Robert Dewar
2001-01-09 18:29 ` dmitry6243
2001-01-09 19:55 ` Robert Dewar
2001-01-10 0:47 ` Brian Rogoff
2001-01-10 21:50 ` Robert Dewar
2001-01-10 9:23 ` dmitry6243
2001-01-10 21:46 ` Robert Dewar
2001-01-11 11:46 ` dmitry6243
2001-01-11 16:48 ` Robert Dewar
2001-01-11 19:52 ` Thierry Lelegard
2001-01-11 20:10 ` Pascal Obry
2001-01-12 8:05 ` Florian Weimer
2001-01-12 13:31 ` gasperon
2001-01-12 14:02 ` n_brunot
2001-01-12 17:26 ` charlet
2001-01-14 18:23 ` n_brunot
2001-01-14 21:05 ` Robert Dewar
2001-01-15 8:56 ` n_brunot
2001-01-12 11:05 ` dmitry6243
2001-01-12 13:55 ` Robert Dewar
2001-01-12 22:10 ` Dale Stanbrough
2001-01-13 1:13 ` Robert Dewar
2001-01-13 17:29 ` dmitry6243
2001-01-13 18:22 ` Robert Dewar
2001-01-13 22:32 ` Brian Rogoff
2001-01-14 6:02 ` Jeffrey Carter
2001-01-14 14:33 ` Robert Dewar
2001-01-14 18:14 ` Jeffrey Carter
2001-01-14 21:10 ` Robert Dewar
2001-01-14 20:45 ` Brian Rogoff
2001-01-14 14:23 ` Robert Dewar
2001-01-14 20:42 ` Brian Rogoff
2001-01-14 21:17 ` Robert Dewar
2001-01-15 20:57 ` Brian Rogoff
2001-01-15 16:25 ` dmitry6243
2001-02-02 7:06 ` Multiple dispatch (was " mark_lundquist
2001-02-02 13:49 ` dmitry6243
2001-01-16 12:22 ` Georg Bauhaus
2001-01-13 4:46 ` Larry Kilgallen
[not found] ` <93ko49$auq$1@nnrp1.deja.coOrganization: LJK Software <eiviJtYj+A7W@eisner.decus.org>
2001-01-13 6:00 ` Robert Dewar
2001-01-11 21:38 ` mark_lundquist
2001-01-12 0:20 ` John English
2001-01-12 13:57 ` Robert Dewar
2001-01-12 20:34 ` mark_lundquist
2001-01-13 18:06 ` Brian Rogoff
2001-01-11 21:28 ` mark_lundquist
2001-01-12 12:35 ` dmitry6243
2001-01-12 21:22 ` mark_lundquist
2001-01-13 1:16 ` Robert Dewar
2001-02-02 5:42 ` mark_lundquist
2001-02-02 14:55 ` Stephen Leake
2001-02-02 20:08 ` Robert Dewar
2001-02-05 15:00 ` Stephen Leake
2001-01-13 21:26 ` Jean-Pierre Rosen
2001-01-11 21:24 ` mark_lundquist
2001-01-12 12:13 ` dmitry6243
2001-01-06 16:21 ` Jean-Pierre Rosen [this message]
2001-01-09 15:15 ` Thierry Lelegard
2001-01-10 21:53 ` Robert Dewar
2001-01-07 19:15 ` DuckE
2001-01-09 20:44 ` Laurent Guerby
2001-01-09 21:46 ` Florian Weimer
2001-01-10 21:57 ` Robert Dewar
2001-01-10 23:51 ` Tucker Taft
2001-01-11 4:23 ` Robert Dewar
2001-01-11 19:28 ` Laurent Guerby
2001-01-18 18:53 ` FAROOQATIF
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