220 23715 article Path: news.gmane.org!not-for-mail From: Howard Hinnant Newsgroups: gmane.comp.lang.c++.isocpp.proposals Subject: Re: Default swap/hash_value Date: Thu, 14 Jan 2016 12:47:56 -0500 Lines: 26 Approved: news@gmane.org Message-ID: 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 (Mac OS X Mail 9.2 \(3112\)) Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable X-Trace: ger.gmane.org 1452793698 22796 80.91.229.3 (14 Jan 2016 17:48:18 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Thu, 14 Jan 2016 17:48:18 +0000 (UTC) To: std-proposals@isocpp.org Original-X-From: std-proposals+bncBCK2HM4L6YERBTN6362AKGQERYRXEAQ@isocpp.org Thu Jan 14 18:48:00 2016 Return-path: Envelope-to: gclcip-std-proposals@m.gmane.org Original-Received: from mail-pf0-f197.google.com ([209.85.192.197]) by plane.gmane.org with esmtp (Exim 4.69) (envelope-from ) id 1aJm07-0005ik-RR for gclcip-std-proposals@m.gmane.org; Thu, 14 Jan 2016 18:48:00 +0100 Original-Received: by mail-pf0-f197.google.com with SMTP id n128sf439392181pfn.2 for ; Thu, 14 Jan 2016 09:47:59 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=isocpp-org.20150623.gappssmtp.com; s=20150623; h=content-type:mime-version:subject:from:in-reply-to:date :content-transfer-encoding:message-id:references:to :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=xfCIhe2oXgoafqAofkmji+tRP5jvEBMc4/Ch5HACam0=; b=eCtV8IykxOl4ezkkbV+z4iq5+/jfwJ0fhSaMc3f1xCQ5xw1+ToVjVX+IjExqvqa/Zh XASJTeIZxTc0ovLD9eblxq1uPFiHOR3NtL8LfLZjRsLloCTNho+16JeD13Zl77jU9TrU syLI/ld2uda/6HZbRJ7izrSF9auPzBqQQcDSvxoNBznN0yTqrrIhfV3+4zX/LqE48wih LbLfjJnhWxbPSFFombko46rZgWCheqCXFfr9lEOVhg1RtzOfMFCha/PP3dYKpfupKE0h bOrgpFhHbkYtAUrPpusDUSOo+Mjm3RsHn3oZmYwoxLOejzcJefSskclUGeFkAbwqNYi9 X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:content-type:mime-version:subject:from :in-reply-to:date:content-transfer-encoding:message-id:references:to :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=xfCIhe2oXgoafqAofkmji+tRP5jvEBMc4/Ch5HACam0=; b=J/6gFT1Z62Ba4NfHLhNSyUgfPIBTpy1HeuAGlgpqXTRMhpWD5i39YrXv620mGRfL4X w8iCJX+jlPha9pdcrJRGpUZfYfmq9OHfa0pC8fr0o4C+uxHfYmKhcEyepNZi1MlqT9GN yZQq/bNNkSZM3GuIUzFqYY1+FST+XdjH1RXOwvz7wPAZpJiSR38fdPT0Ej6v93hpBhRj bV8sSTsukUmtb6+/XFULSf++KF4mHIvsdSaTFjOzvi4pNWWao56ahFjWxWZ++DuBN7kr 2IRaZQG9HagtIMtDPjzDcXpzbiQIzp5ivuOAkn3cehg13RkyVbYBfx16LF+2DLRwrNux X-Gm-Message-State: ALoCoQkPtg4Aj6omBPUVbFdc1LM5sQ+YX+BjC7+wJNSNyyAP8mVeSkRyIXvyWOuUvbghaxnU3Jcgh5nTB19jHboRq+nS81YCGA== X-Received: by 10.66.154.132 with SMTP id vo4mr4803495pab.14.1452793678713; Thu, 14 Jan 2016 09:47:58 -0800 (PST) X-BeenThere: std-proposals@isocpp.org Original-Received: by 10.140.87.66 with SMTP id q60ls712834qgd.62.gmail; Thu, 14 Jan 2016 09:47:56 -0800 (PST) X-Received: by 10.55.77.2 with SMTP id a2mr7256951qkb.108.1452793676929; Thu, 14 Jan 2016 09:47:56 -0800 (PST) Original-Received: from mail-qg0-x234.google.com (mail-qg0-x234.google.com. [2607:f8b0:400d:c04::234]) by mx.google.com with ESMTPS id v7si8339523qhb.113.2016.01.14.09.47.56 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Thu, 14 Jan 2016 09:47:56 -0800 (PST) Received-SPF: pass (google.com: domain of howard.hinnant@gmail.com designates 2607:f8b0:400d:c04::234 as permitted sender) client-ip=2607:f8b0:400d:c04::234; Original-Received: by mail-qg0-x234.google.com with SMTP id b35so358549139qge.0 for ; Thu, 14 Jan 2016 09:47:56 -0800 (PST) X-Received: by 10.140.252.212 with SMTP id x203mr7534183qhc.48.1452793676790; Thu, 14 Jan 2016 09:47:56 -0800 (PST) Original-Received: from [10.0.1.2] (cpe-104-229-168-124.twcny.res.rr.com. [104.229.168.124]) by smtp.gmail.com with ESMTPSA id 75sm2907529qkw.19.2016.01.14.09.47.55 for (version=TLS1 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Thu, 14 Jan 2016 09:47:56 -0800 (PST) In-Reply-To: <601027C6-EDBF-42C5-9AAB-766B31945702@gmail.com> X-Mailer: Apple Mail (2.3112) X-Original-Sender: howard.hinnant@gmail.com X-Original-Authentication-Results: mx.google.com; spf=pass (google.com: domain of howard.hinnant@gmail.com designates 2607:f8b0:400d:c04::234 as permitted sender) smtp.mailfrom=howard.hinnant@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-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:23715 Archived-At: On Jan 14, 2016, at 12:43 PM, Jonathan Coe wrote: >=20 > How will is_uniquely_represented work with architecture dependant alignme= nt requirements and padding? It will have to be up to the author of the type to correctly specialize is_= uniquely_represented for all architectures of interest to them. Padding by= tes can be detected by assuring that the sum of the size of your bases and = members is equal to the size of your type. For example: https://github.com/HowardHinnant/hash_append/blob/master/hash_append.h#L143= -L151 Howard --=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/. .