220 23721 <5697EAD8.8080104@wanadoo.fr> article Path: news.gmane.org!not-for-mail From: "Vicente J. Botet Escriba" Newsgroups: gmane.comp.lang.c++.isocpp.proposals Subject: Re: Re: Default swap/hash_value Date: Thu, 14 Jan 2016 19:37:12 +0100 Lines: 34 Approved: news@gmane.org Message-ID: <5697EAD8.8080104@wanadoo.fr> References: <569582E5.1040108@wanadoo.fr> <2ca0a385-6399-4ac3-ba0d-609628ea4ec6@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; format=flowed Content-Transfer-Encoding: quoted-printable X-Trace: ger.gmane.org 1452796643 13841 80.91.229.3 (14 Jan 2016 18:37:23 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Thu, 14 Jan 2016 18:37:23 +0000 (UTC) To: std-proposals@isocpp.org Original-X-From: std-proposals+bncBDH67CONY4PBBWOV362AKGQEUPGTUYQ@isocpp.org Thu Jan 14 19:37:15 2016 Return-path: Envelope-to: gclcip-std-proposals@m.gmane.org Original-Received: from mail-wm0-f69.google.com ([74.125.82.69]) by plane.gmane.org with esmtp (Exim 4.69) (envelope-from ) id 1aJmlm-0001o1-9w for gclcip-std-proposals@m.gmane.org; Thu, 14 Jan 2016 19:37:14 +0100 Original-Received: by mail-wm0-f69.google.com with SMTP id r131sf107844809wma.1 for ; Thu, 14 Jan 2016 10:37:14 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=isocpp-org.20150623.gappssmtp.com; s=20150623; h=subject:to:references:from:message-id:date:user-agent:mime-version :in-reply-to:content-type:content-transfer-encoding :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=SneCpillc/JfZeL4dagUaN75zsjnNiJEzahK+bXJqg0=; b=MnQ80ixe3qfT5+MuERY4udnd2Je+Ah+ffcTGO6dDE7oi1eYVGxLpihgr3quAnXGRXn Aurrrk70mQj0QpmOU/F6p9s18MAUqXu2UEW1gLJL5FkB2QE+nlGb33+eihaNmEDCqb4E 9R5FGPAUC3PO9fcPJ+fDKkNpbvqZu6AI8XuTlcNfQU3SZYOjtwC6mGWZlwzqICyOxur1 KNRRg2Ln7dgkj55IbC+o4Lzcz1Aoz3uvdEOICwsqvgSOPp8TaU+JPrhNG132krJP18mR jrjVrryEKaliBWs43WPXnpTUyAD5mNuDBNIppwnDN/XabRdrC14MPeYpBuQ0D X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:subject:to:references:from:message-id:date :user-agent:mime-version:in-reply-to:content-type :content-transfer-encoding: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=SneCpillc/JfZeL4dagUaN75zsjnNiJEzahK+bXJqg0=; b=k2KvNW1kKHoRK6oMSo7YlMQ24Yd/kxc7XTm+Coq/EQsNLWwkjwJDYBVxxStX8GO4cs EfCCm1xeZ3Exh0ReKobQUElXhHpQ+cO0O4KRCB8P7HqJWcfW7K2fvh0PR8jm+hRbAHVU nCwS7HJuLTGCBOHV2dqG5L7MlFtHlCRuiuNfmcyTqctoJy4A5ilZW9z+2Y6Vd3DxyxYT plR6oNHZPhEyp1clEqJyecVe8fvORIlgoKE2E9Ddmz4FrDsVga/fxb1+gW4WSCor/aSm gbhVI+tkKvNnM0sQ3PTVyor3b/HyDInp18kFwCo3sqiGkJN X-Gm-Message-State: ALoCoQmle1LzVzNwZiHMf9251dC4MdgQ207E/11wu0S3yACMqmqE+Jeoo3s6WbWT27dyKQrRkGRDHVpdKLnuZWASQCsFvh2+hw== X-Received: by 10.28.172.194 with SMTP id v185mr4350621wme.5.1452796633776; Thu, 14 Jan 2016 10:37:13 -0800 (PST) X-BeenThere: std-proposals@isocpp.org Original-Received: by 10.28.54.17 with SMTP id d17ls1152695wma.0.canary; Thu, 14 Jan 2016 10:37:12 -0800 (PST) X-Received: by 10.28.153.3 with SMTP id b3mr6809779wme.7.1452796632867; Thu, 14 Jan 2016 10:37:12 -0800 (PST) Original-Received: from smtp.smtpout.orange.fr (smtp06.smtpout.orange.fr. [80.12.242.128]) by mx.google.com with ESMTPS id m2si11403453wje.1.2016.01.14.10.37.12 for (version=TLS1 cipher=AES128-SHA bits=128/128); Thu, 14 Jan 2016 10:37:12 -0800 (PST) Received-SPF: neutral (google.com: 80.12.242.128 is neither permitted nor denied by best guess record for domain of vicente.botet@wanadoo.fr) client-ip=80.12.242.128; Original-Received: from new-host.home ([92.139.160.222]) by mwinf5d64 with ME id 5udC1s00B4oBxcU03udCvb; Thu, 14 Jan 2016 19:37:12 +0100 X-ME-Helo: new-host.home X-ME-Auth: dmljZW50ZS5ib3RldEB3YW5hZG9vLmZy X-ME-Date: Thu, 14 Jan 2016 19:37:12 +0100 X-ME-IP: 92.139.160.222 User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.11; rv:38.0) Gecko/20100101 Thunderbird/38.4.0 In-Reply-To: <2ca0a385-6399-4ac3-ba0d-609628ea4ec6@isocpp.org> X-Original-Sender: vicente.botet@wanadoo.fr X-Original-Authentication-Results: mx.google.com; spf=neutral (google.com: 80.12.242.128 is neither permitted nor denied by best guess record for domain of vicente.botet@wanadoo.fr) smtp.mailfrom=vicente.botet@wanadoo.fr 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:23721 Archived-At: Le 14/01/2016 16:59, Tomasz a =C3=A9crit : > I have a comment regarding a restricting generation of swap only in=20 > situation when it would be noexcept: > If I the memberwise swap would not be generated, then I assume normal=20 > std::swap (3xmove) would be used instead. And if the member has=20 > throwing swap, then it would also have throwing move, so std::swap=20 > would also throw in this situation. > However, the std::swap will invoke move for other members of given=20 > class, that may be noexcept swapable but not noexcept moveable (same=20 > implementation of std::list), so the only outcome of avoiding=20 > generation of possibly throwing swap, would be use of swap that is=20 > less efficient and can throw in more cases. Ok, I see. I'll remove the restriction. > > Also language embraced throwing swap, by introduction of=20 > is_noexcept_swappable, so I think swap should be generated regardless=20 > of noexcept of member swap function, but have automatic noexcept=20 > specification (like other generated member functions). and add the noexcept expression. Vicente --=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 https://groups.google.com/a/isocpp.org/group/std-propos= als/. .