From 4323882091550391545 X-Google-Thread: f78e5,d50382f3e5ec6b4e,start X-Google-Thread: 109fba,d50382f3e5ec6b4e,start X-Google-Attributes: gidf78e5,gid109fba,public X-Google-Language: ENGLISH,ASCII Path: g2news1.google.com!news3.google.com!news.glorb.com!news-in.ntli.net!newsrout1-win.ntli.net!ntli.net!peer-uk.news.demon.net!kibo.news.demon.net!news.demon.co.uk!demon!stump.algebra.com!devnull From: zunino@inf.ufsc.br (=?ISO-8859-1?Q?Ney_Andr=E9_de_Mello_Zunino?=) Newsgroups: comp.std.c++,comp.lang.c++ Subject: The issue of const maps and operator[] Date: Thu, 2 Dec 2004 05:38:47 GMT Organization: Universidade Federal de Santa Catarina Lines: 32 Sender: mail2news@demon.net Approved: fjh@cs.mu.oz.au (Fergus Henderson , moderator of comp.std.c++) Message-ID: <3171vsF37jfq7U1@individual.net> NNTP-Posting-Host: news.news.demon.net Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: quoted-printable X-Trace: news.demon.co.uk 1101965942 15227 158.152.254.254 (2 Dec 2004 05:39:02 GMT) X-Complaints-To: abuse@demon.net NNTP-Posting-Date: Thu, 2 Dec 2004 05:39:02 +0000 (UTC) X-Robomod: STUMP, ichudov@algebra.com (Igor Chudov) X-User-Agent: Mozilla Thunderbird 0.9+ (Windows/20041127) X-MIME-Autoconverted: from 8bit to quoted-printable by mulga.cs.mu.OZ.AU id iB25cxBn018548 X-Orig-X-Trace: individual.net XyxE8XUdMHoDIyNxTPO4BgRUAcrE1AKcmrYhaUjqMqnEEccxLA X-Accept-Language: en-us, en X-Virus-Scanned: by amavisd-new at cs.mu.OZ.AU X-Received: (from fjh@localhost) by mulga.cs.mu.OZ.AU (8.12.10+Sun/8.12.9/Submit) id iB25clUA018318; Thu, 2 Dec 2004 16:38:47 +1100 (EST) X-Path: comp-std-cpp-robomod!not-for-mail X-Delivered-To: std-c++@ucar.edu X-Authentication-Warning: mulga.cs.mu.OZ.AU: fjh set sender to devnull@stump.algebra.com using -f X-Newsgroups: comp.std.c++,comp.lang.c++ Xref: g2news1.google.com comp.std.c++:3545 comp.lang.c++:32382 Hello. Searching around before posting this message revealed that the issue has=20 been brought up a significant number of times (here are two related=20 threads [1] [2]). So /std::map<>/ does not provide a const version of=20 its /operator[]/ member function because that function is supposed to=20 modify the map in case the passed key is not present. The question which=20 follows is: why not provide a const overload which would throw when the=20 given key would not exist? It seems like a natural and easy-to-implement=20 solution which would contribute to map's associative array role. In spite of having found several discussions on this topic, I could not=20 find mention of whether this issue is going to be addressed when C++=20 gets its next major revision. Could anyone provide some information=20 (comments, links, etc.) on this? [1] http://groups.google.com/groups?hl=3Den&lr=3D&th=3D47b92be5c9ed558c&r= num=3D1 [2] http://groups.google.com/groups?hl=3Den&lr=3D&th=3D698e93dddf8b22d0&r= num=3D5 Thank you very much, --=20 Ney Andr=E9 de Mello Zunino --- [ 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.jamesd.demon.co.uk/csc/faq.html ]