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: a07f3367d7,3ef3e78eacf6f938
X-Google-Attributes: gida07f3367d7,public,usenet
X-Google-NewGroupId: yes
X-Google-Language: ENGLISH,UTF8
Path: 
 g2news2.google.com!news2.google.com!border1.nntp.dca.giganews.com!nntp.giganews.com!newsfeed00.sul.t-online.de!newsfeed01.sul.t-online.de!t-online.de!newsfeed.velia.net!noris.net!newsfeed.arcor.de!newsspool2.arcor-online.net!news.arcor.de.POSTED!not-for-mail
From: "Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de>
Subject: Re: Alternatives to C: ObjectPascal, Eiffel, Ada or Modula-3?
Newsgroups: comp.lang.eiffel,comp.lang.ada
User-Agent: 40tude_Dialog/2.0.15.1
MIME-Version: 1.0
Content-Type: text/plain; charset="utf-8"
Content-Transfer-Encoding: 8bit
Reply-To: mailbox@dmitry-kazakov.de
Organization: cbb software GmbH
References: <h3sln0$rhm$2@news.eternal-september.org>
 <h41n4c$pm0$1@news.eternal-september.org> 	<h42da2$lcr$1@aioe.org>
 <b38dab3d-77a9-4979-9ef3-6d8198501b4f@w41g2000yqb.googlegroups.com>
 <4A64C6FE.3040003@yahoo.com.br>
Date: Tue, 21 Jul 2009 09:39:30 +0200
Message-ID: <1q7swl7pyo55h$.1c0nqh26yfp8y.dlg@40tude.net>
NNTP-Posting-Date: 21 Jul 2009 09:39:30 CEST
NNTP-Posting-Host: eb8278f8.newsspool3.arcor-online.net
X-Trace: 
 DXC=;LoLA]L7EQ_@>[RYkFXOIPMcF=Q^Z^V3X4Fo<]lROoRQ^YC2XCjHcbYN8@>nj\>j@YDNcfSJ;bb[UIRnRBaCd<M^_jehlNo^^?\3\ZiKZRYTKP
X-Complaints-To: usenet-abuse@arcor.de
Xref: g2news2.google.com comp.lang.eiffel:345 comp.lang.ada:7197
Date: 2009-07-21T09:39:30+02:00
List-Id: <comp.lang.ada>

On Mon, 20 Jul 2009 16:35:26 -0300, Cesar Rabak wrote:

> Hibou57 (Yannick Duchêne) escreveu:
>> On 20 juil, 20:33, Cesar Rabak <csra...@yahoo.com.br> wrote:
>>> Here you create two "subtypes" which are only nicknames for Float in
>>> order to help the Ada compiler to discriminate the signature. BTW, why
>>> the need of two subtypes for coordinates?
>> Not “ subtype ” but “ type ”, which is not the same. Ada has both, and
>> both are differents.
> 
> They are *considered* different in Ada technology, I respect that, but 
> from a OO point of view, they are not: a new type would define a new set 
> of operations on it.

It defines a new set of values, which automatically makes the operations
different even if they are numerically equivalent or their low-level
implementations are shared.

You know, two bottles of beer are numerically equivalent to two worn socks.

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