220 11835 article Path: news.gmane.org!not-for-mail From: Ville Voutilainen Newsgroups: gmane.comp.lang.c++.isocpp.proposals Subject: Re: N4078: Rvalue reference overloads for value() method returns object by value Date: Fri, 11 Jul 2014 10:53:17 +0300 Lines: 62 Approved: news@gmane.org Message-ID: References: <4DA018C3-2327-4F55-B7F8-7988EC7B789A@gmail.com> <1a858a77-310b-4591-aaf5-960c40d9f5fc@isocpp.org> <66AF41C1-CB37-4311-98EA-D47DBC6068DC@gmail.com> <66c38b61-7a95-4ace-b34f-2346bb334fb9@isocpp.org> <6F4B3C72-9962-48DC-8527-0C89EA1B9710@gmail.com> <35873CE5-ED8C-4C03-A6A1-E4132DECD91F@gmail.com> <335948E6-8140-4673-B958-930356A52070@gmail.com> <76ACA175-5A44-4BE8-B49F-BAC6DA65E6B1@gmail.com> <4D3852AD-1AEB-44BA-941C-D645BAD19405@gmail.com> <6a4b6425-1167-40c1-acd8-3945c8cd4c74@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 Content-Transfer-Encoding: quoted-printable X-Trace: ger.gmane.org 1405065205 29578 80.91.229.3 (11 Jul 2014 07:53:25 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Fri, 11 Jul 2014 07:53:25 +0000 (UTC) To: std-proposals@isocpp.org Original-X-From: std-proposals+bncBC5JHI7A7ALRB3NP72OQKGQE7ZPT7RI@isocpp.org Fri Jul 11 09:53:19 2014 Return-path: Envelope-to: gclcip-std-proposals@m.gmane.org Original-Received: from mail-ie0-f199.google.com ([209.85.223.199]) by plane.gmane.org with esmtp (Exim 4.69) (envelope-from ) id 1X5Vdv-0006bl-8T for gclcip-std-proposals@m.gmane.org; Fri, 11 Jul 2014 09:53:19 +0200 Original-Received: by mail-ie0-f199.google.com with SMTP id tr6sf3722556ieb.10 for ; Fri, 11 Jul 2014 00:53:18 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:mime-version:in-reply-to:references:date :message-id:subject:from:to: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:content-transfer-encoding; bh=73OMD9C+vDp6010ayTZ7Ui4LjEqvPfXuE0aP4bS05So=; b=UPT7L2WXXYfKchYT4NxEH7vwiy96Q0tXQXLwxm3uIP/op1ieIf9XAZxOqPrLD6AJS4 XQb0uwiGP0nGfz3ILpMo5UGiwg7960+afSV99f6j5lQROtkQlf8kYtMiwPpmZXG8rbcn b9pfPBb6kFCbaXmJyBqRjZeIMs6VIxdOcq7RHLN6ZySyyDpESViTUh0STM9vUGqypqgK bG8dynXoPd2BXAeA2yRwKkKp3g05vNCQ0ZU6xyeUV+z0ir4GP5lOL9FDgF+Q3WK7M9sF 3fEAawCHnO13V3GQ2wAuR6idanfczmVwqDlalMRT2d2MSuwwogmn7FCFHfZnW/ey9PmV 5awg== X-Gm-Message-State: ALoCoQnnCFLOmgWjQi0eMqraX86AdTvewB5P/orHIdO0o67S/YEr5zMHSho5tmkD2jCxbOCmUR0H X-Received: by 10.42.235.132 with SMTP id kg4mr1337500icb.22.1405065198389; Fri, 11 Jul 2014 00:53:18 -0700 (PDT) X-BeenThere: std-proposals@isocpp.org Original-Received: by 10.140.88.85 with SMTP id s79ls326602qgd.77.gmail; Fri, 11 Jul 2014 00:53:17 -0700 (PDT) X-Received: by 10.140.27.108 with SMTP id 99mr83966106qgw.77.1405065197805; Fri, 11 Jul 2014 00:53:17 -0700 (PDT) Original-Received: from mail-qa0-x22d.google.com (mail-qa0-x22d.google.com [2607:f8b0:400d:c00::22d]) by mx.google.com with ESMTPS id k20si2352680qgd.59.2014.07.11.00.53.17 for (version=TLSv1 cipher=ECDHE-RSA-RC4-SHA bits=128/128); Fri, 11 Jul 2014 00:53:17 -0700 (PDT) Received-SPF: pass (google.com: domain of ville.voutilainen@gmail.com designates 2607:f8b0:400d:c00::22d as permitted sender) client-ip=2607:f8b0:400d:c00::22d; Original-Received: by mail-qa0-f45.google.com with SMTP id s7so591619qap.4 for ; Fri, 11 Jul 2014 00:53:17 -0700 (PDT) X-Received: by 10.224.71.198 with SMTP id i6mr10870912qaj.76.1405065197731; Fri, 11 Jul 2014 00:53:17 -0700 (PDT) Original-Received: by 10.224.31.137 with HTTP; Fri, 11 Jul 2014 00:53:17 -0700 (PDT) In-Reply-To: <6a4b6425-1167-40c1-acd8-3945c8cd4c74@isocpp.org> X-Original-Sender: ville.voutilainen@gmail.com X-Original-Authentication-Results: mx.google.com; spf=pass (google.com: domain of ville.voutilainen@gmail.com designates 2607:f8b0:400d:c00::22d as permitted sender) smtp.mail=ville.voutilainen@gmail.com; dkim=pass header.i=@gmail.com; dmarc=pass (p=NONE dis=NONE) header.from=gmail.com 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:11835 Archived-At: On 11 July 2014 10:40, Andrzej Krzemie=C5=84ski wrote: > Guys, I just want to summarize what is being discussed here so that every= one > is on the same page. We are discussing how overloads operator*() and valu= e() > are defined in optional. > > Prior to the adoption of N4078, the Fundamentals TS had them as: > T& operator*(); > T const& operator*() const; > > > T& value(); > T const& value() const; > > With the adoption of N4078, Fundamentals TS has: > T& operator*() &; > T const& operator*() const&; > T operator*() &&; // by value > T operator*() const&&; // by value > > T& value() &; > T const& value() const&; > T value() &&; // by value > T value() const&&; // by value > > Now the change that Anna and Tomasz and Ville are considering (an I suppo= rt) > is for Fundamentals TS to have: > T& operator*() &; > T const& operator*() const&; > T&& operator*() &&; // by rvalue ref > > > T& value() &; > T const& value() const&; > > T&& value() &&; // by rvalue ref > > So we are not reverting the change. We change further. > > Am I right? Yes, although the signatures I'm aiming at are in http://open-std.org/JTC1/SC22/WG21/docs/papers/2014/n3982.html Whether we'll need separate signatures for const T&& needs to be checked wi= th LEWG. --=20 ---=20 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 e= mail 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-proposa= ls/. .