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Botet Escriba" Newsgroups: gmane.comp.lang.c++.isocpp.proposals Subject: Re: Default swap/hash_value Date: Thu, 14 Jan 2016 19:34:15 +0100 Lines: 31 Approved: news@gmane.org Message-ID: <5697EA27.7090603@wanadoo.fr> References: <569582E5.1040108@wanadoo.fr> <4072A7C6-B09D-4847-971B-2914643B91D7@gmail.com> <569594AD.6000505@wanadoo.fr> <2170C30C-830F-47C2-8397-29DD4ED35E97@gmail.com> <56960730.9000403@wanadoo.fr> <9160999F-C7E2-4D3F-B343-96CF587BEF61@gmail.com> <5696CC0A.5040709@wanadoo.fr> <753EF830-97D0-4653-B056-BDB2CD4B0760@gmail.com> <601027C6-EDBF-42C5-9AAB-766B31945702@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; format=flowed Content-Transfer-Encoding: quoted-printable X-Trace: ger.gmane.org 1452796471 10941 80.91.229.3 (14 Jan 2016 18:34:31 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Thu, 14 Jan 2016 18:34:31 +0000 (UTC) To: std-proposals@isocpp.org Original-X-From: std-proposals+bncBDH67CONY4PBBKWU362AKGQELZNVUOI@isocpp.org Thu Jan 14 19:34:22 2016 Return-path: Envelope-to: gclcip-std-proposals@m.gmane.org Original-Received: from mail-wm0-f72.google.com ([74.125.82.72]) by plane.gmane.org with esmtp (Exim 4.69) (envelope-from ) id 1aJmix-0007yQ-U2 for gclcip-std-proposals@m.gmane.org; Thu, 14 Jan 2016 19:34:20 +0100 Original-Received: by mail-wm0-f72.google.com with SMTP id b14sf107985384wmb.2 for ; Thu, 14 Jan 2016 10:34:19 -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=9jdNCJZOosnLG2EDDl/4fbsQbgAFFtPLj2zMhhlvJGQ=; b=PiEs6khMglyjnTLdZ+RZ/CPrHyJrL431lX3jhs/yPSSZMrRKPGuVXI2tKxGCUc6Mfc 3lFSZkn9bLyIBlDXIZMT+ZjgZod5pS0I2FpiG1ZbKHLe244o9SWKgTzyAZop00fsNsN+ 6qtWBw6uMYmH9/IgEdBEEG+Aul2SoZQjlykZxGaTjlSXOSF9SJUkGr/JXrnvb1B4Co8Z oouERy5o9liwTLMQGEAQtzYwOvgR7FGmTyQ5PohXbZuTOxQCZcQMO3EJJJSnAClB5RMO YwIX0vf7Uw+6hQ3UEZo5Yva6hU8T+eE93q0rHTPG5LYUVOfAcZ6QWwgjxRuse 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=9jdNCJZOosnLG2EDDl/4fbsQbgAFFtPLj2zMhhlvJGQ=; b=YNvXIPAd5i0q3xpjyR0OhKngRn0QCR9cnFtYjBhQK3A8Q2Qw6Tc76NE+Y7yLustcDy 4/JYo1xXELzWjfVesJFbTml2F3DyZ68ZYpHu7XdT2EI0yUbOHs/XicK9DQfdnyOn4B72 C48C3SQb3VkuC8ZNPDphNyAwwG+95sk1NIga1xeBfgM17jAsW86v8+You+1/z6pInNHq G8sx70ZJSZLIkNTpKhSPI7khmIeAgmKIhan1lzqBkSOAgD1RqmZd+rsbIJenujZlzZIm 0EoJnic3mrav0oRfBGYFS5K++/qAlklcexfYmw0oAipGzM/ X-Gm-Message-State: ALoCoQks5zRr4xIQ/vjScAbWECzh+UztMhBlM6q9/dX14l/OmPMUJ8cN7e8gSl8hi74b+j4JceGCM9731pECKzNuNUy0NJd2vQ== X-Received: by 10.112.234.225 with SMTP id uh1mr658377lbc.1.1452796459428; Thu, 14 Jan 2016 10:34:19 -0800 (PST) X-BeenThere: std-proposals@isocpp.org Original-Received: by 10.28.129.145 with SMTP id c139ls1135994wmd.52.canary; Thu, 14 Jan 2016 10:34:18 -0800 (PST) X-Received: by 10.194.58.235 with SMTP id u11mr5662535wjq.52.1452796458082; Thu, 14 Jan 2016 10:34:18 -0800 (PST) Original-Received: from smtp.smtpout.orange.fr (smtp06.smtpout.orange.fr. [80.12.242.128]) by mx.google.com with ESMTPS id w2si11314099wjf.153.2016.01.14.10.34.18 for (version=TLS1 cipher=AES128-SHA bits=128/128); Thu, 14 Jan 2016 10:34:18 -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 5uaF1s00e4oBxcU03uaGT8; Thu, 14 Jan 2016 19:34:17 +0100 X-ME-Helo: new-host.home X-ME-Auth: dmljZW50ZS5ib3RldEB3YW5hZG9vLmZy X-ME-Date: Thu, 14 Jan 2016 19:34:17 +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: 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:23720 Archived-At: Le 14/01/2016 18:47, Howard Hinnant a =C3=A9crit : > On Jan 14, 2016, at 12:43 PM, Jonathan Coe wrote= : >> How will is_uniquely_represented work with architecture dependant alignm= ent requirements and padding? > It will have to be up to the author of the type to correctly specialize i= s_uniquely_represented for all architectures of interest to them. Padding = bytes can be detected by assuring that the sum of the size of your bases an= d members is equal to the size of your type. For example: > > https://github.com/HowardHinnant/hash_append/blob/master/hash_append.h#L1= 43-L151 > > Howard. I don't see why the author should be the single one able to do=20 it correctly. Do you see a case for classes like std::pair for which the=20 specialization your showed is not a good one? 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/. .