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-Thread: 103376,703c4f68db81387d X-Google-Thread: 109fba,703c4f68db81387d X-Google-Thread: 115aec,703c4f68db81387d X-Google-Thread: f43e6,703c4f68db81387d X-Google-Attributes: gid103376,gid109fba,gid115aec,gidf43e6,public X-Google-Language: ENGLISH,ASCII-7-bit Path: g2news1.google.com!news3.google.com!news.glorb.com!feeder.enertel.nl!nntpfeed-01.ops.asmr-01.energis-idc.net!216.196.110.149.MISMATCH!border2.nntp.ams.giganews.com!border1.nntp.ams.giganews.com!nntp.giganews.com!pe2.news.blueyonder.co.uk!blueyonder!pe1.news.blueyonder.co.uk!blueyonder!news-out.ntli.net!newsrout1-gui.ntli.net!ntli.net!newspeer1-win.ntli.net!newsfe5-gui.ntli.net.POSTED!53ab2750!not-for-mail From: "Dr. Adrian Wrigley" Subject: Re: [OT] Re: Teaching new tricks to an old dog (C++ -->Ada) User-Agent: Pan/0.14.2 (This is not a psychotic episode. It's a cleansing moment of clarity.) Message-Id: Newsgroups: comp.lang.ada,comp.lang.c++,comp.realtime,comp.software-eng References: <4229bad9$0$1019$afc38c87@news.optusnet.com.au> <1110032222.447846.167060@g14g2000cwa.googlegroups.com> <871xau9nlh.fsf@insalien.org> <3SjWd.103128$Vf.3969241@news000.worldonline.dk> <87r7iu85lf.fsf@insalien.org> <1110052142.832650@athnrd02> <42309456$1@news.broadpark.no> <4232ab3a$0$26547$9b4e6d93@newsread4.arcor-online.net> <1110825790.396769@athnrd02> <1gf23j59mnsm2.wimnrcdrb09u.dlg@40tude.net> MIME-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 8bit Date: Mon, 14 Mar 2005 21:46:55 GMT NNTP-Posting-Host: 81.100.88.147 X-Complaints-To: http://www.ntlworld.com/netreport X-Trace: newsfe5-gui.ntli.net 1110836815 81.100.88.147 (Mon, 14 Mar 2005 21:46:55 GMT) NNTP-Posting-Date: Mon, 14 Mar 2005 21:46:55 GMT Organization: ntl Cablemodem News Service Xref: g2news1.google.com comp.lang.ada:9399 comp.lang.c++:45688 comp.realtime:1480 comp.software-eng:5046 Date: 2005-03-14T21:46:55+00:00 List-Id: On Mon, 14 Mar 2005 16:02:43 -0500, Robert A Duff wrote: > I agree -- that's a pain. > > The only way around it, it seems to me, is to have the compiler > automatically create a hash function (or something) for every type -- > after all, you can't expect to create these kinds of containers without > a hash function (or something, like "<"), whether the user is required > to write it or not. Lots of languages do something like that... precisely. That was my point (Friday) about needing proper language support for associative arrays in both C++ and Ada, or (as you suggest) lower-level prerequisites. In Ada, maybe it could be a 'Hash attribute. I think we can also see clearly how generics/templates are only superficially equivalent in what programmers demand of them. The contract model being a big part of the encapsulation process considered essential by Ada users, but *worse than useless* from the C++ view. Thnaks Rob for putting the points more eloquently! -- Adrian