From -5731116759170720152 X-Google-Thread: f78e5,c4a7f0fb4ab1315a,start X-Google-Attributes: gidf78e5,public X-Google-Language: ENGLISH,ASCII-7-bit Path: g2news1.google.com!news3.google.com!border1.nntp.dca.giganews.com!nntp.giganews.com!local01.nntp.dca.giganews.com!nntp.speakeasy.net!news.speakeasy.net.POSTED!not-for-mail NNTP-Posting-Date: Thu, 22 Mar 2007 09:50:04 -0500 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 From: Sylvain Pion Newsgroups: comp.std.c++ Subject: Possible ambiguity in parsing complex depending on locale ? Organization: INRIA - Unite de Recherche Sophia Antipolis (France) Message-ID: Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit X-Complaints-To: abuse@sophia.inria.fr User-Agent: Thunderbird 1.5.0.10 (X11/20070301) X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-2.0.2 (sophia.inria.fr [138.96.64.20]); Thu, 22 Mar 2007 11:55:20 +0100 (MET) X-Virus-Scanned: by amavisd-new at sophia.inria.fr X-Virus-Scanned: amavisd-new at ucar.edu X-Virus-Scanned: amavisd-new at csse.unimelb.edu.au Approved: Fergus Henderson , moderator of comp.std.c++ X-Virus-Scanned: amavisd-new at csse.unimelb.edu.au Date: Thu, 22 Mar 2007 09:46:35 CST Lines: 37 NNTP-Posting-Host: 65.182.171.162 X-Trace: sv3-Ic6rgTTDn20pv8bG5eA8DFsrIICsSAk6c7Ge+qFUU3P4kA2HtAcCd6fVWXBA9ofgHLEdmMYW5SGfqD5!Pub/PFuzoZTxBoaJ1pSuT/7s229I4Hu4TDpIplpoVV7fyWLRYwi6ToTYWZjVklDRuPCoAX3Vk2Ds!u1b0/MWV+NjO X-Complaints-To: abuse@speakeasy.net X-DMCA-Complaints-To: abuse@speakeasy.net 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: 1.3.34 Xref: g2news1.google.com comp.std.c++:8170 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 ]