220 19225 <8100167.A1Y3soRlXn@tjmaciei-mobl4> article Path: news.gmane.org!not-for-mail From: Thiago Macieira Newsgroups: gmane.comp.lang.c++.isocpp.proposals Subject: Re: Re: Overloading std::begin and std::end for std::pair Date: Thu, 23 Jul 2015 15:58:18 -0700 Lines: 40 Approved: news@gmane.org Message-ID: <8100167.A1Y3soRlXn@tjmaciei-mobl4> References: <012fd35d-96fd-4775-835e-2105176c4f97@isocpp.org> <792fab39-5af7-4d95-b9ba-a5cc4aed8544@isocpp.org> Reply-To: std-proposals@isocpp.org NNTP-Posting-Host: plane.gmane.org Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8 X-Trace: ger.gmane.org 1437692311 27010 80.91.229.3 (23 Jul 2015 22:58:31 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Thu, 23 Jul 2015 22:58:31 +0000 (UTC) To: std-proposals@isocpp.org Original-X-From: std-proposals+bncBCB4TK757YBRBDPDYWWQKGQELCGD3QI@isocpp.org Fri Jul 24 00:58:23 2015 Return-path: Envelope-to: gclcip-std-proposals@m.gmane.org Original-Received: from mail-wi0-f197.google.com ([209.85.212.197]) by plane.gmane.org with esmtp (Exim 4.69) (envelope-from ) id 1ZIPRX-0003GH-3h for gclcip-std-proposals@m.gmane.org; Fri, 24 Jul 2015 00:58:23 +0200 Original-Received: by wicmv11 with SMTP id mv11sf923768wic.1 for ; Thu, 23 Jul 2015 15:58:22 -0700 (PDT) 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:content-type:x-original-sender :x-original-authentication-results:reply-to:precedence:mailing-list :list-id:x-spam-checked-in-group:list-post:list-help:list-archive :list-subscribe:list-unsubscribe; bh=I9oNpJV5hhOFYQ0zQlPvzb6yXRmu/b1j099NorJYn5c=; b=eIFTrLhVjumrO94dK+9id1vk6xYHflcmD7YS+WIlkdPa/QP0tm9iKRY/KLwUNH2z5b K/oLO/bxN0XyYLXEf6NJopUKmibV3/JjPC7d/tDIA7lITfwJQ7R8y3bOA28k5SEzG/a1 tXT/uvVaTPCsCCUqnyRnnsLZcAAlrlU/MFzf4qPhG9TSTu7nu2DDfvFSSyJRcr0n0/8z xBqiZPHNz32btLuzkX0EwdwvH6wYhWPA/gLAXPJrtgTLFC3c9xU12/WKqGV0FqzWDkBh +kBP3BStXojLSRAShiNmt22S/phb9Wly36igVCqIzp+vFO91ZNH27aaL5e9mM4oaqSRM EK1Q= X-Gm-Message-State: ALoCoQlvhR+IaWRPzmtwOxehRD9l0yj2x2yF61swLSUwo15IaQub5NXGbe+obs9fg1TItpMyQNX0 X-Received: by 10.112.181.37 with SMTP id dt5mr4856460lbc.10.1437692302341; Thu, 23 Jul 2015 15:58:22 -0700 (PDT) X-BeenThere: std-proposals@isocpp.org Original-Received: by 10.180.8.98 with SMTP id q2ls20823wia.49.canary; Thu, 23 Jul 2015 15:58:21 -0700 (PDT) X-Received: by 10.180.81.106 with SMTP id z10mr1063166wix.22.1437692301101; Thu, 23 Jul 2015 15:58:21 -0700 (PDT) Original-Received: from gondolin.macieira.info (gondolin.macieira.info. [2a01:4f8:d13:f81:21c:14ff:fe01:12a3]) by mx.google.com with ESMTP id fj6si663553wib.55.2015.07.23.15.58.21 for ; Thu, 23 Jul 2015 15:58:21 -0700 (PDT) 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-mobl4.localnet (jfdmzpr06-ext.jf.intel.com [134.134.137.75]) by gondolin.macieira.info (Postfix) with ESMTPSA id E133611A54B for ; Thu, 23 Jul 2015 15:58:19 -0700 (PDT) User-Agent: KMail/4.14.9 (Linux/4.0.5-3-desktop; KDE/4.14.9; x86_64; ; ) In-Reply-To: <792fab39-5af7-4d95-b9ba-a5cc4aed8544@isocpp.org> 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-Spam-Checked-In-Group: std-proposals@isocpp.org 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:19225 Archived-At: On Thursday 23 July 2015 12:31:59 Vlad from Moscow wrote: > Could you explain why do I need some ranges when this program looks clear > and nice without any ranges? Because you made it so that std::pair is always a range, but that isn't the case. In fact, I'd argue that most people who think of "iterating" over a pair expect it to behave as an array of two elements: the first and the second. I'd expect: template const T* begin(const pair &p) { return &p.first; } template const T *end(const pair &p) { return &p.second + 1; } Which allows me to run: int main() { for (auto i : std::make_pair(1, 2)) cout << i << ' '; cout << endl; } output: 1 2 -- 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/. .