From 4856388933116655276 X-Google-Thread: f78e5,c4a7f0fb4ab1315a X-Google-Attributes: gidf78e5,public X-Google-Language: ENGLISH,ASCII-7-bit Path: g2news1.google.com!news4.google.com!news.glorb.com!news.tele.dk!feed118.news.tele.dk!news.tele.dk!small.news.tele.dk!lnewsinpeer00.lnd.ops.eu.uu.net!emea.uu.net!peer-uk.news.demon.net!kibo.news.demon.net!news.demon.co.uk!demon!stump.algebra.com!devnull From: Sylvain.Pion@sophia.inria.fr (Sylvain Pion) Newsgroups: comp.std.c++ Subject: Possible ambiguity in parsing complex depending on locale ? Date: Thu, 22 Mar 2007 15:12:47 GMT Organization: INRIA - Unite de Recherche Sophia Antipolis (France) Lines: 37 Sender: mail2news@demon.net Approved: fjh@cs.mu.oz.au (Fergus Henderson , moderator of comp.std.c++) Message-ID: NNTP-Posting-Host: news.news.demon.net Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit X-Trace: news.demon.co.uk 1174576436 25397 158.152.254.254 (22 Mar 2007 15:13:56 GMT) X-Complaints-To: abuse@demon.net NNTP-Posting-Date: Thu, 22 Mar 2007 15:13:56 +0000 (UTC) X-Original-To: std-c++@mailman.ucar.edu X-Robomod: STUMP, ichudov@algebra.com (Igor Chudov) X-User-Agent: Thunderbird 1.5.0.10 (X11/20070301) X-Virus-Scanned: amavisd-new at csse.unimelb.edu.au X-Received: (from fjh@localhost) by mulga.csse.unimelb.edu.au (8.13.8+Sun/8.13.8/Submit) id l2MFCld4014268; Fri, 23 Mar 2007 02:12:47 +1100 (EST) X-Path: comp-std-cpp-robomod!not-for-mail X-Delivered-To: std-c++@mailman.ucar.edu X-Authentication-Warning: mulga.csse.unimelb.edu.au: fjh set sender to devnull@stump.algebra.com using -f X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-2.0.2 (sophia.inria.fr [138.96.64.20]); Thu, 22 Mar 2007 11:53:22 +0100 (MET) X-Newsgroups: comp.std.c++ Xref: g2news1.google.com comp.std.c++:8173 Hi, I am wondering if there can be an ambiguity in parsing std::complex from a stream, depending on the locale. The standard says: template basic_istream& operator>>(basic_istream& is , complex& x ); Effects: Extracts a complex number x of the form: u, (u), or (u,v), where u is the real part and v is the imaginary part. Now, what happens if the decimal point is a comma, following the locale? In that case, "(1,2)" could be parsed in 2 different ways, in practice ending up with the complex number being the real number 1.2 instead of (1,2). I am not very familiar with how locales work, so I don't know if they can affect this stream operator. The context of this question is that I have the same issue for the std::interval proposal (N2137), where intervals can be read as [u] or [u,v]. Thanks for any answer and advice. -- Sylvain --- [ 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 ]