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=-1.9 required=5.0 tests=BAYES_00 autolearn=ham
	autolearn_force=no version=3.4.4
X-Google-Language: ENGLISH,ASCII-7-bit
X-Google-Thread: 103376,a00006d3c4735d70
X-Google-Attributes: gid103376,public
X-Google-ArrivalTime: 2004-01-27 09:24:34 PST
Path: 
 archiver1.google.com!news2.google.com!newsfeed2.dallas1.level3.net!news.level3.com!zeus.visi.com!news-out.visi.com!petbe.visi.com!newspeer.monmouth.com!newsswitch.lcs.mit.edu!nntp.TheWorld.com!not-for-mail
From: Robert A Duff <bobduff@shell01.TheWorld.com>
Newsgroups: comp.lang.ada
Subject: Re: In-Out Parameters for functions
Date: 27 Jan 2004 12:24:33 -0500
Organization: The World Public Access UNIX, Brookline, MA
Message-ID: <wccfze1z4mm.fsf@shell01.TheWorld.com>
References: <5ad0dd8a.0401240721.7682f2e1@posting.google.com>
 <mailman.14.1074976968.2270.comp.lang.ada@ada-france.org>
 <bv5an3$ocsr3$1@ID-69815.news.uni-berlin.de>
NNTP-Posting-Host: pip1-5.std.com
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
X-Trace: pcls4.std.com 1075224273 27953 192.74.137.185 (27 Jan 2004 17:24:33
 GMT)
X-Complaints-To: abuse@TheWorld.com
NNTP-Posting-Date: Tue, 27 Jan 2004 17:24:33 +0000 (UTC)
User-Agent: Gnus/5.09 (Gnus v5.9.0) Emacs/21.2
Xref: archiver1.google.com comp.lang.ada:4912
Date: 2004-01-27T12:24:33-05:00
List-Id: <comp.lang.ada>

Peter Amey <peter.amey@praxis-cs.co.uk> writes:

>... SPARK functions never have side effects, ...

SPARK is consistent.  No side effects involving globals, no side effects
involving parameters.  No side effects.  Simple.

Ada is inconsistent -- as Robert Dewar says, side effects are allowed,
so long as you don't document them on the function spec.

- Bob