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=-1.3 required=5.0 tests=BAYES_00,MAILING_LIST_MULTI, REPLYTO_WITHOUT_TO_CC autolearn=no autolearn_force=no version=3.4.4 X-Google-Language: ENGLISH,ASCII-7-bit X-Google-Thread: 103376,3885b7fd66a1db28 X-Google-Attributes: gid103376,public X-Google-ArrivalTime: 2003-01-09 22:46:03 PST Path: archiver1.google.com!news1.google.com!newsfeed.stanford.edu!logbridge.uoregon.edu!fr.usenet-edu.net!usenet-edu.net!enst.fr!not-for-mail From: "Grein, Christoph" Newsgroups: comp.lang.ada Subject: Re: Why is Ada NOT a good choice for a beginner to programming? Date: Fri, 10 Jan 2003 07:38:18 +0100 (MET) Organization: ENST, France Sender: comp.lang.ada-admin@ada.eu.org Message-ID: Reply-To: comp.lang.ada@ada.eu.org NNTP-Posting-Host: marvin.enst.fr Mime-Version: 1.0 Content-Type: TEXT/plain; charset=us-ascii X-Trace: avanie.enst.fr 1042181162 24143 137.194.161.2 (10 Jan 2003 06:46:02 GMT) X-Complaints-To: usenet@enst.fr NNTP-Posting-Date: Fri, 10 Jan 2003 06:46:02 +0000 (UTC) Return-Path: X-Authentication-Warning: mail.eurocopter.com: uucp set sender to using -f Content-MD5: 1laladlVhynpjOJROQ0MVA== X-Mailer: dtmail 1.2.1 CDE Version 1.2.1 SunOS 5.6 sun4u sparc Errors-To: comp.lang.ada-admin@ada.eu.org X-BeenThere: comp.lang.ada@ada.eu.org X-Mailman-Version: 2.0.13 Precedence: bulk X-Reply-To: "Grein, Christoph" List-Unsubscribe: , List-Id: comp.lang.ada mail<->news gateway List-Post: List-Help: List-Subscribe: , Errors-To: comp.lang.ada-admin@ada.eu.org X-BeenThere: comp.lang.ada@ada.eu.org Xref: archiver1.google.com comp.lang.ada:32863 Date: 2003-01-10T07:38:18+01:00 > > One complaint he had was that it be possible to define a Length > > using derived types and still have "*" return values of type Length, > > when it should return an area. He had a point, hadn't he? > > OTOH, with only structural equivalence of types, and no way to derive > > both an integral length type and an integral area type, that are really > > diferent, how can you build areas into your types, such that the compiler > > will prevent use of values of the wrong type? > > > > In which languages has this been fixed? > > This is relatively easy to do in C++. > See http://www.fnal.gov/docs/working-groups/fpcltf/html/SIunits-summary.html This is also easy in Ada. For a collection of methods how to deal with dimensions in Ada, see