From mboxrd@z Thu Jan  1 00:00:00 1970
X-Spam-Checker-Version: SpamAssassin 3.4.4 (2020-01-24) on polar.synack.me
X-Spam-Level: 
X-Spam-Status: No, score=-0.3 required=5.0 tests=BAYES_00,
	REPLYTO_WITHOUT_TO_CC autolearn=no autolearn_force=no version=3.4.4
X-Google-Thread: 103376,b3f788f59498d3af
X-Google-Attributes: gid103376,public,usenet
X-Google-Language: ENGLISH,ASCII-7-bit
Path: 
 g2news1.google.com!news4.google.com!news.germany.com!newsfeed01.sul.t-online.de!t-online.de!newsfeed.arcor.de!newsspool1.arcor-online.net!news.arcor.de.POSTED!not-for-mail
From: "Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de>
Subject: Re: Exceptions and out procedure arguments (using GNAT GPL)
Newsgroups: comp.lang.ada
User-Agent: 40tude_Dialog/2.0.15.1
MIME-Version: 1.0
Content-Type: text/plain; charset="us-ascii"
Content-Transfer-Encoding: 7bit
Reply-To: mailbox@dmitry-kazakov.de
Organization: cbb software GmbH
References: <79c673pq5htg508nkoi935n3udqg5ps7r8@4ax.com>
Date: Sat, 16 Jun 2007 08:55:44 +0200
Message-ID: <1rtyporytkm2u.dyecl8roox43$.dlg@40tude.net>
NNTP-Posting-Date: 16 Jun 2007 08:55:37 CEST
NNTP-Posting-Host: b5c07e75.newsspool4.arcor-online.net
X-Trace: 
 DXC=6ddQF4oh]gIlU`@c^jLCbJ4IUK<Cl32<A4Fo<]lROoRA4nDHegD_]REeElOAQ@m7lHDNcfSJ;bb[EIRnRBaCd<MN3l^_ho`nTSD?JCbDAP[VCO
X-Complaints-To: usenet-abuse@arcor.de
Xref: g2news1.google.com comp.lang.ada:16207
Date: 2007-06-16T08:55:37+02:00
List-Id: <comp.lang.ada>

On Sat, 16 Jun 2007 01:05:10 GMT, Fionn Mac Cumhaill wrote:

> Consider a procedure that starts like this:
> 
> procedure My_Procedure (
>   O: out integer
> )
> is
> begin
> 
>   -- various statements follow
> 
>   O := 999;
> 
>   -- more statements follow
> 
>   raise My_Exception;

If you want to keep side effects on a parameter upon raising an exception,
then you should use access to Integer, because Integer is not a
by-reference type:

procedure My_Procedure (O: access integer) is
begin
   ...
   O.all := 999;
   ...
   raise My_Exception;

-- 
Regards,
Dmitry A. Kazakov
http://www.dmitry-kazakov.de