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=-2.4 required=5.0 tests=BAYES_00,
	FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM,HEADER_FROM_DIFFERENT_DOMAINS,
	MAILING_LIST_MULTI autolearn=unavailable autolearn_force=no
	version=3.4.4
X-Google-Language: ENGLISH,ASCII-7-bit
X-Google-Thread: 103376,7009ff26a584c028
X-Google-Attributes: gid103376,public
Path: 
 g2news1.google.com!news2.google.com!news.maxwell.syr.edu!newsfeed.icl.net!proxad.net!usenet-fr.net!enst.fr!melchior!cuivre.fr.eu.org!melchior.frmug.org!not-for-mail
From: Duncan Sands <baldrick@free.fr>
Newsgroups: comp.lang.ada
Subject: Re: Dimensions and fixed point types
Date: Fri, 11 Jun 2004 21:10:56 +0200
Organization: Cuivre, Argent, Or
Message-ID: <mailman.93.1086981064.391.comp.lang.ada@ada-france.org>
References: <mailman.77.1086765132.391.comp.lang.ada@ada-france.org>
	<mailman.92.1086939983.391.comp.lang.ada@ada-france.org>
	<xemyc.11946$wi2.4321@nwrdny01.gnilink.net>
NNTP-Posting-Host: lovelace.ada-france.org
Mime-Version: 1.0
Content-Type: text/plain;
  charset="iso-8859-1"
Content-Transfer-Encoding: 7bit
X-Trace: melchior.cuivre.fr.eu.org 1086981064 44436 212.85.156.195 (11 Jun
 2004 19:11:04 GMT)
X-Complaints-To: usenet@melchior.cuivre.fr.eu.org
NNTP-Posting-Date: Fri, 11 Jun 2004 19:11:04 +0000 (UTC)
Cc: Hyman Rosen <hyrosen@mail.com>
To: comp.lang.ada@ada-france.org
Return-Path: <duncan.sands@math.u-psud.fr>
User-Agent: KMail/1.6.2
In-Reply-To: <xemyc.11946$wi2.4321@nwrdny01.gnilink.net>
Content-Disposition: inline
X-Virus-Scanned: by amavisd-new-20030616-p7 (Debian) at ada-france.org
X-BeenThere: comp.lang.ada@ada-france.org
X-Mailman-Version: 2.1.4
Precedence: list
List-Id: "Gateway to the comp.lang.ada Usenet newsgroup"
	<comp.lang.ada.ada-france.org>
List-Unsubscribe: <http://www.ada-france.org/mailman/listinfo/comp.lang.ada>,
	<mailto:comp.lang.ada-request@ada-france.org?subject=unsubscribe>
List-Post: <mailto:comp.lang.ada@ada-france.org>
List-Help: <mailto:comp.lang.ada-request@ada-france.org?subject=help>
List-Subscribe: <http://www.ada-france.org/mailman/listinfo/comp.lang.ada>,
	<mailto:comp.lang.ada-request@ada-france.org?subject=subscribe>
Xref: g2news1.google.com comp.lang.ada:1404
Date: 2004-06-11T21:10:56+02:00

On Friday 11 June 2004 19:47, Hyman Rosen wrote:
> Duncan Sands wrote:
> > On Friday 11 June 2004 09:26, Hyman Rosen wrote:
> >>You appear to imply that multiplying apples and apples
> >>to get apples, on the other hand, *is* "type safe". Why?
> > 
> > I implied no such thing.
> 
> Well, here's what you said:
>     > It seems to me that a much better approach would be
>     > to say that multiplication between different fixed
>     > point types is NOT automatically defined
> 
> This certainly implies that you believe that multiplication
> of a fixed point type with itself should be automatically
> defined. How else is one to read this?

There is no contradiction.  Not saying X is not the same
as saying not X.  However from a practical point of view,
any proposal to not have multiplication be auto-defined
between fixed point numbers of the same type would
never be accepted, since such multiplication is defined
in the case of integer and floating point types.  So I didn't
propose it.  That doesn't mean I think that auto-defining
such multiplication is a good idea.  In many contexts
multiplying two numbers of the same type makes no sense.

Ciao,

Duncan.