220 8366 <2779799.GqlxqVrW4X@tjmaciei-mobl2> article Path: news.gmane.org!not-for-mail From: Thiago Macieira Newsgroups: gmane.comp.lang.c++.isocpp.proposals Subject: Re: Re: Obtaining a non-const iterators from a const_iterator and a non-const reference to the container Date: Thu, 02 Jan 2014 11:40:23 -0200 Lines: 24 Approved: news@gmane.org Message-ID: <2779799.GqlxqVrW4X@tjmaciei-mobl2> References: <68deff4f-5f1d-440e-b6cd-1e5077a3ff96@isocpp.org> <52C5156C.7030601@knejp.de> Reply-To: std-proposals@isocpp.org NNTP-Posting-Host: plane.gmane.org Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 X-Trace: ger.gmane.org 1388670025 32373 80.91.229.3 (2 Jan 2014 13:40:25 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Thu, 2 Jan 2014 13:40:25 +0000 (UTC) To: std-proposals@isocpp.org Original-X-From: std-proposals+bncBCB4TK757YBRBTGYSWLAKGQEIN2HE4Y@isocpp.org Thu Jan 02 14:40:29 2014 Return-path: Envelope-to: gclcip-std-proposals@m.gmane.org Original-Received: from mail-fa0-f72.google.com ([209.85.161.72]) by plane.gmane.org with esmtp (Exim 4.69) (envelope-from ) id 1VyiVh-0002sd-7i for gclcip-std-proposals@m.gmane.org; Thu, 02 Jan 2014 14:40:29 +0100 Original-Received: by mail-fa0-f72.google.com with SMTP id k1sf24860246fak.11 for ; Thu, 02 Jan 2014 05:40:28 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:from:to:subject:date:message-id:user-agent :in-reply-to:references:mime-version:x-original-sender :x-original-authentication-results:reply-to:precedence:mailing-list :list-id:list-post:list-help:list-archive:list-subscribe :list-unsubscribe:content-type; bh=Noy8Dgvheq45fayxOgw0kYOfbqomQQqBcL96hblhSWY=; b=aimnUl9SFe1ZdsREmbbClHbwsd0o5y609QjNrAhIwNS3jPyH0N+tlh69erYCtb0X1c r75iEt1OnYf/CJlK7ZK95W7Yb1V3UsnEOgUjEX0YpoEHuk82wM3AfeLv6Z3kPpksCQsj 4mbh89r4FP+3kSM0j3EZxlZEEZSgRYJ8sJS88t272uSlUdL7AAzDe36G2n4eKSjYHl6p mz6i93y1hX0ix2yXYBQ75tqH6djroSmc06ED8sFNSaxKk0K4/1mJXnnXKKcNjaV38mZn sqTX/oUu0O35KGS1lnDc6NLPcCJY8MeGrhv6ib3WpZPa0K99cHJHTMEFqqHFlcOhnZGg cP4Q== X-Gm-Message-State: ALoCoQnawZ85lijo8UDQbdukJaUBqryVlglBC/Dv6SXLnMrRqD8BWA46gQD1XGrbrwCUjLWfhvOX X-Received: by 10.180.74.131 with SMTP id t3mr13568156wiv.0.1388670028717; Thu, 02 Jan 2014 05:40:28 -0800 (PST) X-BeenThere: std-proposals@isocpp.org Original-Received: by 10.180.79.161 with SMTP id k1ls959499wix.11.gmail; Thu, 02 Jan 2014 05:40:27 -0800 (PST) X-Received: by 10.194.104.66 with SMTP id gc2mr4814953wjb.75.1388670027790; Thu, 02 Jan 2014 05:40:27 -0800 (PST) Original-Received: from gondolin.macieira.info (gondolin.macieira.info. [2a01:4f8:d13:f81:21c:14ff:fe01:12a3]) by mx.google.com with ESMTP id q13si21568192wiv.34.2014.01.02.05.40.27 for ; Thu, 02 Jan 2014 05:40:27 -0800 (PST) Received-SPF: pass (google.com: domain of thiago@macieira.org designates 2a01:4f8:d13:f81:21c:14ff:fe01:12a3 as permitted sender) client-ip=2a01:4f8:d13:f81:21c:14ff:fe01:12a3; Original-Received: from tjmaciei-mobl2.localnet (unknown [179.209.204.181]) by gondolin.macieira.info (Postfix) with ESMTPSA id 18C3511A775 for ; Thu, 2 Jan 2014 05:40:27 -0800 (PST) User-Agent: KMail/4.12 pre (Linux/3.9.10-100+i915fix.fc17.x86_64; KDE/4.11.60; x86_64; git-8054221; 2013-08-01) In-Reply-To: <52C5156C.7030601@knejp.de> X-Original-Sender: thiago@macieira.org X-Original-Authentication-Results: mx.google.com; spf=pass (google.com: domain of thiago@macieira.org designates 2a01:4f8:d13:f81:21c:14ff:fe01:12a3 as permitted sender) smtp.mail=thiago@macieira.org Precedence: list Mailing-list: list std-proposals@isocpp.org; contact std-proposals+owners@isocpp.org List-ID: X-Google-Group-Id: 399137483710 List-Post: , List-Help: , List-Archive: List-Subscribe: , List-Unsubscribe: , Xref: news.gmane.org gmane.comp.lang.c++.isocpp.proposals:8366 Archived-At: On quinta-feira, 2 de janeiro de 2014 08:29:48, Miroslav Knejp wrote: > You could just make a temporary > container and use it for the cast. Unless the iterators track their > container (which is probably only the case in debug builds, if at all) > this works even better than the advance/distance trick (which is at > least quite inefficient for most iterator types). The iterator doesn't need to track the container for the debug code to be able to verify if the const_iterator being passed belongs to that container. -- Thiago Macieira - thiago (AT) macieira.info - thiago (AT) kde.org Software Architect - Intel Open Source Technology Center PGP/GPG: 0x6EF45358; fingerprint: E067 918B B660 DBD1 105C 966C 33F5 F005 6EF4 5358 -- --- You received this message because you are subscribed to the Google Groups "ISO C++ Standard - Future Proposals" group. To unsubscribe from this group and stop receiving emails from it, send an email to std-proposals+unsubscribe@isocpp.org. To post to this group, send email to std-proposals@isocpp.org. Visit this group at http://groups.google.com/a/isocpp.org/group/std-proposals/. .