220 28539 <03b1942d-6e9d-849f-2dd9-b127bad1854e@Stroustrup.com> article Path: news.gmane.org!.POSTED!not-for-mail From: Bjarne Stroustrup Newsgroups: gmane.comp.lang.c++.isocpp.proposals Subject: Re: A plea to reconsider adding Structured Bindings to language Date: Wed, 5 Oct 2016 12:30:28 -0400 Lines: 88 Approved: news@gmane.org Message-ID: <03b1942d-6e9d-849f-2dd9-b127bad1854e@Stroustrup.com> References: <201610051238.17863.marc.mutz@kdab.com> Reply-To: std-proposals@isocpp.org NNTP-Posting-Host: blaine.gmane.org Mime-Version: 1.0 Content-Type: multipart/alternative; boundary="------------B311E0158E739889F70086AA" X-Trace: blaine.gmane.org 1475685047 1810 195.159.176.226 (5 Oct 2016 16:30:47 GMT) X-Complaints-To: usenet@blaine.gmane.org NNTP-Posting-Date: Wed, 5 Oct 2016 16:30:47 +0000 (UTC) User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:45.0) Gecko/20100101 Thunderbird/45.4.0 Cc: hsutter@microsoft.com, gdr@microsoft.com To: Nicol Bolas , ISO C++ Standard - Future Proposals Original-X-From: std-proposals+bncBDDP5YUK74KBBJOV2S7QKGQE56RANXY@isocpp.org Wed Oct 05 18:30:41 2016 Return-path: Envelope-to: gclcip-std-proposals@m.gmane.org Original-Received: from mail-qk0-f200.google.com ([209.85.220.200]) by blaine.gmane.org with esmtp (Exim 4.84_2) (envelope-from ) id 1brp5Q-0006aY-7X for gclcip-std-proposals@m.gmane.org; Wed, 05 Oct 2016 18:30:28 +0200 Original-Received: by mail-qk0-f200.google.com with SMTP id n189sf15232366qke.0 for ; Wed, 05 Oct 2016 09:30:30 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=isocpp-org.20150623.gappssmtp.com; s=20150623; h=from:subject:to:references:cc:message-id:date:user-agent :mime-version:in-reply-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=APaSOscN9Yo8yEJRpRj0n72ToHsBG15xd98+bRGB0M4=; b=et1L3yN7WA0wO7Cmy6pYJelHUqYXHNAqB0CPyCY1mfuaEaWHdhJQa/OOuTONs/uHrZ WKyNG8t8Z+ShLkpOmQN+Se2LGMMUGKXUfP0GuHQbiJxXQXOwgjogW5I1NvcQdoYtAYsO ZclxoJhJFwAYYEFv8TQoMvMuTxX31wU7HUPFgObX1r3mbVInj8NPpAMxP1/5DTgFs/RW v2+0qSrQ7Cv1aJ0we4EQUAVlOSsrXUZrKr+k8Fa26wA5hXGlY8YTZFE1/96IEHjDisEo jB8exhDvOUnpUQOBa+ZoT2Qi9Fut5uzGvBwV3ZeRECzz8nadUnDjqUMmquQBRvAwAnBS 3OSA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:from:subject:to:references:cc:message-id:date :user-agent:mime-version:in-reply-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=APaSOscN9Yo8yEJRpRj0n72ToHsBG15xd98+bRGB0M4=; b=jWPock0q5JFnmsanh4oyho5ANCkw57F0kxilXgyMyRBmA4tpIngPOx+qc/y3a9Rntm NUMiXB0/5I+j/yX+hkfUbOOmsxhJt1KXbL6ZLmtr8clx2zFEqsv7HVS1wa/H+m2DRXTI iPVK9tbiMXP3HhA6J4rYitXuuIhsGIOAU3cawRnQ5LbKbfjjcnj3rP1n1c7HPfN/2xwP 3+a8NEGy/i6+8OofXAsaX3L/iwpcuvytEi3ZSNjqciC8SBQ0s8cEpZECVZfvo6dQmKjt UlhgSxFZBg8OlTqD1y1gJ6V7aLZLZkgPrcnNefIT/Idb7XVxEWwxFWdmcmpd+WHIu1Ct 4kiw== X-Gm-Message-State: AA6/9RkqSqjtrMFM3noCBlPjORFgn5DPWFTsXDSldaTEBAPI4Yd8mYOMZjxgpmC/5vC4ZQ== X-Received: by 10.200.36.41 with SMTP id c38mr32192qtc.21.1475685030095; Wed, 05 Oct 2016 09:30:30 -0700 (PDT) X-BeenThere: std-proposals@isocpp.org Original-Received: by 10.157.32.200 with SMTP id x66ls1128725ota.40.gmail; Wed, 05 Oct 2016 09:30:29 -0700 (PDT) X-Received: by 10.233.237.145 with SMTP id c139mr9491054qkg.29.1475685029177; Wed, 05 Oct 2016 09:30:29 -0700 (PDT) Original-Received: from mail-qk0-x22c.google.com (mail-qk0-x22c.google.com. [2607:f8b0:400d:c09::22c]) by mx.google.com with ESMTPS id d12si16489817qtc.70.2016.10.05.09.30.29 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Wed, 05 Oct 2016 09:30:29 -0700 (PDT) Received-SPF: neutral (google.com: 2607:f8b0:400d:c09::22c is neither permitted nor denied by best guess record for domain of bjarne@stroustrup.com) client-ip=2607:f8b0:400d:c09::22c; Original-Received: by mail-qk0-x22c.google.com with SMTP id j129so215642075qkd.1 for ; Wed, 05 Oct 2016 09:30:29 -0700 (PDT) X-Received: by 10.55.156.22 with SMTP id f22mr11038766qke.36.1475685028885; Wed, 05 Oct 2016 09:30:28 -0700 (PDT) Original-Received: from [192.168.10.32] ([138.20.184.130]) by smtp.googlemail.com with ESMTPSA id h22sm1782918qtb.32.2016.10.05.09.30.28 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Wed, 05 Oct 2016 09:30:28 -0700 (PDT) In-Reply-To: X-Original-Sender: bjarne@stroustrup.com X-Original-Authentication-Results: mx.google.com; dkim=pass header.i=@stroustrup-com.20150623.gappssmtp.com; spf=neutral (google.com: 2607:f8b0:400d:c09::22c is neither permitted nor denied by best guess record for domain of bjarne@stroustrup.com) smtp.mailfrom=bjarne@stroustrup.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:28539 Archived-At: This is a multi-part message in MIME format. --------------B311E0158E739889F70086AA Content-Type: text/plain; charset=UTF-8; format=flowed On 10/5/2016 12:14 PM, Nicol Bolas wrote: > On Wednesday, October 5, 2016 at 6:36:35 AM UTC-4, Marc Mutz wrote: > > Hi Herb, Bjarne, Gabriel, > ... > > > Structured binding is hardly the first C++ feature that makes struct > field ordering important. Aggregate initialization did that long > before. If you "reorder fields to fill padding holes" on an interface > structure, then you've broken any code that used aggregate > initialization on that type. Good point. It has been like this since 1974 or so. .... -- 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 email to std-proposals+unsubscribe@isocpp.org. To post to this group, send email to std-proposals@isocpp.org. To view this discussion on the web visit https://groups.google.com/a/isocpp.org/d/msgid/std-proposals/03b1942d-6e9d-849f-2dd9-b127bad1854e%40Stroustrup.com. --------------B311E0158E739889F70086AA Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: quoted-printable



On 10/5/2016 12:14 PM, Nicol Bolas wrote:
On Wednesday, October 5, 2016 at 6:36:35 AM UTC-4, Marc Mutz wrote:
Hi Herb, Bjarne, Gabriel,
...

Structured binding is hardly the first C++ feature that makes struct field ordering important. Aggregate initialization did that long before. If you "reorder fields to fill padding holes" on an interface structure, then you've broken any code that used aggregate initialization on that type.
Good point. It has been like this since 1974 or so.

...

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