From -1487818597341283273 X-Google-Language: ENGLISH,ASCII-7-bit X-Google-Thread: f78e5,fdf5ec91b4c47347 X-Google-Attributes: gidf78e5,public X-Google-ArrivalTime: 2003-01-28 14:17:52 PST Path: archiver1.google.com!news1.google.com!newsfeed.stanford.edu!news-spur1.maxwell.syr.edu!news.maxwell.syr.edu!newsfeed.icl.net!newsfeed.fjserv.net!kibo.news.demon.net!mutlu.news.demon.net!demon!mail2news.demon.co.uk!devnull From: john@nospam.demon.co.uk (John G Harris) Newsgroups: comp.std.c++ Subject: Re: Some features to be added to class-based OO languages Date: Tue, 28 Jan 2003 22:17:51 +0000 (UTC) Organization: None Lines: 30 Approved: fjh@cs.mu.oz.au (Fergus Henderson , moderator of comp.std.c++) Message-ID: <$LrUE6OgquN+EwOI@jgharris.demon.co.uk> References: <59143289.0301271214.4aaeeb32@posting.google.com> Mime-Version: 1.0 Content-Type: text/plain;charset=us-ascii X-Trace: mail2news.demon.co.uk 1043792271 12326 10.0.0.1 (28 Jan 2003 22:17:51 GMT) X-Complaints-To: abuse@demon.net NNTP-Posting-Date: Tue, 28 Jan 2003 22:17:51 +0000 (UTC) X-Received: from mulga.cs.mu.oz.au ([128.250.1.22]) by news.demon.co.uk with esmtp (Exim 4.05) id 18de3B-0003Cf-00 for mail2news@news.news.demon.net; Tue, 28 Jan 2003 22:17:50 +0000 X-Received: by mulga.cs.mu.OZ.AU id JAA13274; Wed, 29 Jan 2003 09:17:45 +1100 (EST) X-Authentication-Warning: mulga.cs.mu.OZ.AU: fjh set sender to devnull@stump.algebra.com using -f X-Path: comp-std-cpp-robomod!not-for-mail X-Robomod: STUMP, ichudov@algebra.com (Igor Chudov) X-Delivered-To: std-c++@ncar.ucar.edu X-Reply-To: jgharris@ic4life.net X-Newsgroups: comp.std.c++ X-User-Agent: Turnpike/6.02-S () X-Spam-Status: No, hits=-7.4 required=5.0 tests=INVALID_MSGID,NOSPAM_INC,REFERENCES,SIGNATURE_SHORT_DENSE, SPAM_PHRASE_00_01,USER_AGENT version=2.41 Xref: archiver1.google.com comp.std.c++:17602 In article <59143289.0301271214.4aaeeb32@posting.google.com>, O.V. writes >2.1. Seamless interface conversions >an object >should be possible to use as an interface if it has all the methods of >that interface. That's a very misleading assumption. Remember the BS example : do you expect void draw(); to make a picture, fire a six-gun, hand out a poker card, get money out of a bank, or what? Inheritance provides a unique and unbreakable link from an object's semantics to an interface's semantics. John -- John Harris mailto:john@jgharris.demon.co.uk --- [ comp.std.c++ is moderated. To submit articles, try just posting with ] [ your news-reader. If that fails, use mailto:std-c++@ncar.ucar.edu ] [ --- Please see the FAQ before posting. --- ] [ FAQ: http://www.jamesd.demon.co.uk/csc/faq.html ]