From 4365330632310200883 X-Google-Thread: f78e5,ac8f7c796c0ee2eb X-Google-Attributes: gidf78e5,public,usenet X-Google-Language: ENGLISH,ASCII Path: g2news1.google.com!news1.google.com!border1.nntp.dca.giganews.com!nntp.giganews.com!local01.nntp.dca.giganews.com!news.giganews.com.POSTED!not-for-mail NNTP-Posting-Date: Tue, 20 Nov 2007 17:30:04 -0600 Return-Path: X-Authentication-Warning: mulga.csse.unimelb.edu.au: fjh set sender to devnull@stump.algebra.com using -f X-Robomod: STUMP, ichudov@algebra.com (Igor Chudov) X-Original-To: std-c++@mailman.ucar.edu Delivered-To: std-c++@mailman.ucar.edu X-SMTP-Auth: no From: James Kanze Newsgroups: comp.std.c++ Subject: Re: std::pair istream >> operator Organization: http://groups.google.com Message-ID: References: Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 X-Complaints-To: groups-abuse@google.com Complaints-To: groups-abuse@google.com Injection-Info: b15g2000hsa.googlegroups.com; posting-host=86.70.189.110; posting-account=1W_PtwoAAAA1QoMcl2Z5P6j-DNc8HR3W User-Agent: G2/1.0 X-HTTP-UserAgent: Mozilla/5.0 (X11; U; Linux i686 (x86_64); en-US; rv:1.8.1.6) Gecko/20070725 Firefox/2.0.0.6,gzip(gfe),gzip(gfe) Content-Disposition: inline X-Virus-Scanned: amavisd-new at ucar.edu X-Virus-Scanned: amavisd-new at csse.unimelb.edu.au Content-Transfer-Encoding: 8bit X-MIME-Autoconverted: from quoted-printable to 8bit by mulga.csse.unimelb.edu.au id lAKMW6qb022416 Approved: Fergus Henderson , moderator of comp.std.c++ X-Virus-Scanned: amavisd-new at csse.unimelb.edu.au Date: Tue, 20 Nov 2007 17:27:11 CST Lines: 44 X-Usenet-Provider: http://www.giganews.com X-Trace: sv3-on1+sftOA4SgbnLbx9br/V3RzueDaNksAzFW6rJC/vukJKMfvEecAA3M1Dgk3kEb5FKEyHk4uVgvaWS!MzgNudgtauUwvatxz++CUWtAcznfWY9kU3rBa6K954md8ja9uyngwc0RYmrfhf9T7yqDitGmvsZs!BVH6vwMKVy0Bb3puutGAPcGOxHw= X-Complaints-To: abuse@giganews.com X-DMCA-Notifications: http://www.giganews.com/info/dmca.html X-Abuse-and-DMCA-Info: Please be sure to forward a copy of ALL headers X-Abuse-and-DMCA-Info: Otherwise we will be unable to process your complaint properly X-Postfilter: 1.3.36 Xref: g2news1.google.com comp.std.c++:9661 On Nov 19, 7:19 pm, "Jim Langston" wrote: > "Andrey" wrote in message > news:a7eb92bf-1ab8-438d-8bca-b6f7cfcc056c@o6g2000hsd.googlegroups.com... > > I'm wondering why there is no standard operator defined like > > the following? > > template > > istream & operator >> (istream & in, pair & p) { > > return in>>p.first>>p.second; > > } > > I always define it by hand. > Probably the same reason operator( istream& in, std::vector& p ) is not > defined. Or map. Or list. Or any of the other containers. They are > trivial to define Are they? Write a definition of std::pair that will work when invoked by the std::ostream_iterator of the type? Perhaps the biggest argument for defining them in the standard is that for built-in types, they must be defined in std::, which is something a user isn't allowed to do. Of course, the argument only holds water if you believe that they should be overloaded. Given that the types in question have no semantics, and no real "standard" format, there should probably never be an << or a >> for such types in a program, neither in the standard nor in user code. -- James Kanze (GABI Software) email:james.kanze@gmail.com Conseils en informatique orient�e objet/ Beratung in objektorientierter Datenverarbeitung 9 place S�mard, 78210 St.-Cyr-l'�cole, France, +33 (0)1 30 23 00 34 --- [ 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.comeaucomputing.com/csc/faq.html ]