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,FREEMAIL_FROM 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!news4.google.com!news1.google.com!newsprint.newsread.com!newsread.com!news-xfer.newsread.com!newspeer.monmouth.com!news.tele.dk!news.tele.dk!small.news.tele.dk!news100.image.dk!news000.worldonline.dk.POSTED!not-for-mail From: "Peter Koch Larsen" 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$1@news.broadpark.no> <1110570242.82910@athnrd02> Subject: Re: [OT] Re: Teaching new tricks to an old dog (C++ -->Ada) X-Priority: 3 X-MSMail-Priority: Normal X-Newsreader: Microsoft Outlook Express 6.00.2900.2180 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2180 X-RFC2646: Format=Flowed; Original Message-ID: <%aAYd.104217$Vf.3993735@news000.worldonline.dk> Date: Sat, 12 Mar 2005 12:09:44 +0100 NNTP-Posting-Host: 62.79.147.244 X-Complaints-To: news-abuse@wol.dk X-Trace: news000.worldonline.dk 1110626107 62.79.147.244 (Sat, 12 Mar 2005 12:15:07 MET) NNTP-Posting-Date: Sat, 12 Mar 2005 12:15:07 MET Organization: Customer of Tiscali A/S Xref: g2news1.google.com comp.lang.ada:9212 comp.lang.c++:45281 comp.realtime:1347 comp.software-eng:4912 Date: 2005-03-12T12:09:44+01:00 List-Id: "REH" skrev i en meddelelse news:d0strm$ep73@cui1.lmms.lmco.com... > > "Ioannis Vranos" wrote in message > news:1110570242.82910@athnrd02... >> REH wrote: >> >> >>Named parameter association. Proper parameter modes >> >>"out" and "in out" modes >> > >> > I would love have named parameters too. That way I would not have to >> > "agonize" over the "priority" of my default parameters (i.e., if there > are >> > 10 and I have to change the 10th from its default, I have to define the >> > first 9). >> >> >> The many parameters passed by reference to be modified is an outdated C >> style. >> >> > That's not what I mean. I mean I have a function foo that takes many > parameters. I can think of nothing beyond a contrived example: > > void foo(int a= 1, int b = 2, int c = 3); > > I usually try and determine which will change most often, and make that > the > first one, and on down the line. The is because if I need to define > parameter c in a call to foo, I need to define a and b also. In Ada I can > just say: > > foo(c => 5); > > I had one instance where I had many complex objects that took a lot of > constructor parameters. I ended up putting the parameters in related > groups, and making each group a struct, each with its own set of defaults > so > I would only have to define them if I cared about a particular group. I'm > sure there is probably a better design. I hope that was clear. > > First off, I do not believe in procedures with many parameters. But if you do want to use such a feature, look at boost, which lets you say e.g. foo(c = 5) or foo(c = 4,a = 2). This is all outside the core language, relying on some (vlever) template programming.