220 11806 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: Thu, 10 Jul 2014 16:25:57 +0300 Lines: 39 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> 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 1404998768 12741 80.91.229.3 (10 Jul 2014 13:26:08 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Thu, 10 Jul 2014 13:26:08 +0000 (UTC) To: std-proposals@isocpp.org Original-X-From: std-proposals+bncBC5JHI7A7ALRBZVI7KOQKGQE654F2HY@isocpp.org Thu Jul 10 15:26:01 2014 Return-path: Envelope-to: gclcip-std-proposals@m.gmane.org Original-Received: from mail-pd0-f198.google.com ([209.85.192.198]) by plane.gmane.org with esmtp (Exim 4.69) (envelope-from ) id 1X5EMK-0004Aa-4f for gclcip-std-proposals@m.gmane.org; Thu, 10 Jul 2014 15:26:00 +0200 Original-Received: by mail-pd0-f198.google.com with SMTP id y10sf55151891pdj.1 for ; Thu, 10 Jul 2014 06:25:59 -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=M/QiEfdtD6MG8Kz5jK9Dr6aUbQ/ev/HpEaMgxZTEPoU=; b=XGbNtfCPJYm8o02gNM9lTm0Son2FGhj0p2cvy7/GQ4z4JlKx7PNJUnIMKUCve17ke5 vbqgNsGPOy8nSERVUP+oMfE5CcRFJdvvZ41VwKQccKtJqIXExMa6hjzPq5fvJuykDdB7 UJsTY0lNwpKyAks/mkCtjxusQ2ZFIpCUL56iqvY+0wFXST3FJ7wlufNVFgFY/jWO7hb6 fEpVn41XJfJ9B1ySYYRFJj0lCa//1K2GZkPg9dLt0sPuVu3Jok3d/6eB/xbZwM6EoUjT pPdAOFMDuTAN9GFnNoO0FEb3i40V/siuCuHmEVDsMcJER3f1TWoCLdysQs++oRDNT2us IORA== X-Gm-Message-State: ALoCoQlR+Zf0OUKc7sLxGHH+nAtkuMmPFaNkd/wQzpH3aJeCqdb/67Oo1hi5ww+51XirSdOoLQDf X-Received: by 10.66.121.2 with SMTP id lg2mr12562799pab.43.1404998759072; Thu, 10 Jul 2014 06:25:59 -0700 (PDT) X-BeenThere: std-proposals@isocpp.org Original-Received: by 10.140.48.112 with SMTP id n103ls58035qga.86.gmail; Thu, 10 Jul 2014 06:25:58 -0700 (PDT) X-Received: by 10.140.50.50 with SMTP id r47mr58866887qga.96.1404998758152; Thu, 10 Jul 2014 06:25:58 -0700 (PDT) Original-Received: from mail-qc0-x235.google.com (mail-qc0-x235.google.com [2607:f8b0:400d:c01::235]) by mx.google.com with ESMTPS id a5si43742911qge.60.2014.07.10.06.25.58 for (version=TLSv1 cipher=ECDHE-RSA-RC4-SHA bits=128/128); Thu, 10 Jul 2014 06:25:58 -0700 (PDT) Received-SPF: pass (google.com: domain of ville.voutilainen@gmail.com designates 2607:f8b0:400d:c01::235 as permitted sender) client-ip=2607:f8b0:400d:c01::235; Original-Received: by mail-qc0-f181.google.com with SMTP id x13so7864892qcv.40 for ; Thu, 10 Jul 2014 06:25:58 -0700 (PDT) X-Received: by 10.140.20.98 with SMTP id 89mr74296048qgi.33.1404998757998; Thu, 10 Jul 2014 06:25:57 -0700 (PDT) Original-Received: by 10.224.31.137 with HTTP; Thu, 10 Jul 2014 06:25:57 -0700 (PDT) In-Reply-To: <6F4B3C72-9962-48DC-8527-0C89EA1B9710@gmail.com> 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:c01::235 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:11806 Archived-At: On 10 July 2014 12:03, David Krauss wrote: > > On 2014=E2=80=9307=E2=80=9310, at 5:01 PM, Ville Voutilainen > wrote: > > On 10 July 2014 11:58, David Krauss wrote: > > Risky micro-optimization should never be the default. If > > > It's not a micro-optimization. > > > Eliminating one move is a micro-optimization. No it is not. For legacy types with user-provided copy operations or a user-provided destructor, that move is a copy. It is not a micro-optimization regardless of how many times you want to repeat your uneducated position. The rvalue-ref-qualified signatures need to return T&& instead of T. LEWG needs an NB comment to be able to make that fix for Fundamentals v1, and I'm going to provide t= hem with one. --=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/. .