From 3914906127942051639 X-Google-Thread: f78e5,ac8f7c796c0ee2eb X-Google-Attributes: gidf78e5,public,usenet X-Google-Language: ENGLISH,ASCII Path: g2news1.google.com!news3.google.com!out04b.usenetserver.com!news.usenetserver.com!in02.usenetserver.com!news.usenetserver.com!pd7cy1no!shaw.ca!news.alt.net!comp-std-cpp-robomod!not-for-mail From: James Kanze Newsgroups: comp.std.c++ Subject: Re: std::pair istream >> operator Date: Tue, 20 Nov 2007 17:27:36 CST Organization: http://groups.google.com Lines: 44 Approved: Fergus Henderson , moderator of comp.std.c++ Message-ID: <70cc8b71-e1b1-4a8c-8576-13f8d2265dc8@d50g2000hsf.googlegroups.com> References: Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 8bit X-Trace: posting.google.com 1195598058 30653 127.0.0.1 (20 Nov 2007 22:34:18 GMT) X-Complaints-To: groups-abuse@google.com NNTP-Posting-Date: Tue, 20 Nov 2007 22:34:18 +0000 (UTC) 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 Complaints-To: groups-abuse@google.com Injection-Info: d50g2000hsf.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 X-MIME-Autoconverted: from quoted-printable to 8bit by mulga.csse.unimelb.edu.au id lAKMYPQI023692 X-Virus-Scanned: amavisd-new at csse.unimelb.edu.au Xref: g2news1.google.com comp.std.c++:9660 On Nov 19, 8:08 pm, tazmas...@rocketmail.com ("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. > Consider, also, that your implemnation can be broken for > std::pair since the std::string can contain a space. In > which case it might need to be > std::getline( in, p.first ); > return in >> p.second; > or even with you probably want a > std::getline for the second parameter. That's a problem with std::string in general. I use a special class, ParsableString, when I have to do round trip IO on a string, and no other solution is readily available. The problem is that you need a separator, even with std::pair. And that separator will probably depend on what the std::pair is being used for. -- 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 ]