220 35978 article Path: news.gmane.org!.POSTED!not-for-mail From: Jake Arkinstall Newsgroups: gmane.comp.lang.c++.isocpp.proposals Subject: Re: Re: operator[](...) Date: Mon, 18 Dec 2017 17:04:39 +0000 Lines: 65 Approved: news@gmane.org Message-ID: References: <8bbeac1f-f698-4e49-9e1f-4cb1ab389b09@isocpp.org> <0aeb1cbe-dbdf-4d66-bbe6-2a127b0c1a6c@isocpp.org> Reply-To: std-proposals@isocpp.org NNTP-Posting-Host: blaine.gmane.org Mime-Version: 1.0 Content-Type: multipart/alternative; boundary="001a113db95482b6c70560a0586f" X-Trace: blaine.gmane.org 1513616571 14854 195.159.176.226 (18 Dec 2017 17:02:51 GMT) X-Complaints-To: usenet@blaine.gmane.org NNTP-Posting-Date: Mon, 18 Dec 2017 17:02:51 +0000 (UTC) To: std-proposals@isocpp.org Original-X-From: std-proposals+bncBDCZX3WUUQFRBKHK37IQKGQE7C4X6XA@isocpp.org Mon Dec 18 18:02:42 2017 Return-path: Envelope-to: gclcip-std-proposals@m.gmane.org Original-Received: from mail-oi0-f71.google.com ([209.85.218.71]) by blaine.gmane.org with esmtp (Exim 4.84_2) (envelope-from ) id 1eQyoJ-0002sp-4n for gclcip-std-proposals@m.gmane.org; Mon, 18 Dec 2017 18:02:39 +0100 Original-Received: by mail-oi0-f71.google.com with SMTP id v63sf7313319oif.7 for ; Mon, 18 Dec 2017 09:04:41 -0800 (PST) ARC-Seal: i=2; a=rsa-sha256; t=1513616681; cv=pass; d=google.com; s=arc-20160816; b=KjLTsmFXWavJ6cVMPQ8ZaW3tTyapWA4D+hqd3GWSusZ7+RRvjlHpMAcRfINL9AZx7v CAc9MhpkBhmS1YZgAMvANRm209FkHdsqYf1WzkVIk3zc0JI6DYuVEE+J/ADkkH8f0mrQ Lr3DLpYiPEiZZP3I7mK+Wwxhkc1EEFJCJVS2gV1sZUNnznstoU+FNapbGDJjIlCQ0s/s yWn31WKqEDo8/jDB7UblDv1nDvJlrdmBUna87fPbQf26Z5sMGK6hGRI4TxO5ufLXCbK/ jNSAGASCzaSvx2Ut0G+sCM0U9aONkux0/2wYgOO7XoPqZbUl5jCbSIxK05uZ7lxgeHyw rn5g== ARC-Message-Signature: i=2; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-unsubscribe:list-subscribe:list-archive:list-help:list-post :list-id:mailing-list:precedence:reply-to:to:subject:message-id:date :from:references:in-reply-to:mime-version:arc-authentication-results :arc-message-signature:dkim-signature:arc-authentication-results; bh=nP+pMmPkvbgp0wc6ZmP02hpTPCbuIFkTdo6dIihkhlY=; b=Zhreo/9XtASGu8iisrblO+8YJhKQof1Kqqia3eHAQo43wdFOuQW1shdr+JyMjEk5ct XoOkE5QXHDoonIEs+HFUSfqfvS1HapZsVQYN4kP8RJEFz65Gf27cBP/WS4zj9Tu2EU0s TJpVHYD8V1tQeKzjMDUGgsVDjOi81EJmaxYutU1XcEYxglolFOeQmQx4fHNkxRfgck6Q pLQZ2pNeu+1zB2yK/LfWAxEbAEFiO2gu3rn1W7T+3ZP3KiHwjDHcjyhSKVmQd3dnFQ+r Vyc/wyyCpMnr8OmJRCbLedwTRzO+L4n5g3FdtLNqWLaVl/syu9VltZmfYQh8zwl8Nyis bOsA== ARC-Authentication-Results: i=2; mx.google.com; dkim=pass header.i=@gmail.com header.s=20161025 header.b=uNT3PA4p; spf=pass (google.com: domain of jake.arkinstall@gmail.com designates 209.85.220.41 as permitted sender) smtp.mailfrom=jake.arkinstall@gmail.com; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=gmail.com DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=isocpp-org.20150623.gappssmtp.com; s=20150623; h=mime-version:in-reply-to:references:from:date:message-id:subject: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; bh=nP+pMmPkvbgp0wc6ZmP02hpTPCbuIFkTdo6dIihkhlY=; b=sVOLr8O7TeqT3c1lrzioc8Bdpm6r7Bj9oTFUywbiXOFeY6on7RqX6wFWdg7A40M4GA 2dFcox+531ASFhzk3YVGZuRjql3WWzDVF5N//vU7yth53HPb5MuEc0hLkyrn+wZpdt44 rsHOp5oHzGR4iaGJIpQtiMlgqOOjbBE/5zXBV8/55/xR4fde39Z7+LIcsWwEmh6t4u6/ hdoVmYItnoHFDC1gg73MrTngo4FYn+l7wiJ+xPEQK2nAU+NXB4d9xKtPUR6DAZuPxa6r ILver7AeZZhcRzckr/9tHRrXADCqtQFtdhJe1AiDG0k9pnUL6vqVMqvorXCBRbGw6Wmn oA3Q== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:in-reply-to:references:from:date :message-id:subject: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=nP+pMmPkvbgp0wc6ZmP02hpTPCbuIFkTdo6dIihkhlY=; b=VDVoHI1mpcYD6j/LS/o9EgtQgu4svXgHL5KxyHDunnj79Vkwpwt6+Ed8CtnM+3aNho 6ScdA10fbAV69fQ9nyqwAlVpS58rHE4kCwYVszSJ+z/Nzs3IfFKbm6mr/4eOLUzWED2I Cs70phlj/KFStIyZzZQy3VRvyX+dIdBGXoAO6QLyv9l8jQ2ApDZl0NE5LZR+Avivw14e widbl97NG9loia40xNB7NTvKLt71Gp5R1GmZS9LXS0uF7rmiArKuq3E0PUmfByyd27yy pNSk2SK5Lmbv50/T20YvjgGyl0DHEQhKsa1ekhTviwh2YMvvkz9A+CeFKM2gQg8y8Bif iYGQ== X-Gm-Message-State: AKGB3mLixcTvOb0DRrIeD25SnHox6uo7Mt9fM6KvoJFFirWqwJtKbpia L4xMA9kcydwwEebrkFRzcsQGpA== X-Google-Smtp-Source: ACJfBouCLxzpmrg8elbMz1EKeC6KAnepy+IroaJIHi/V3afd3V+DuuvFjJ+U9bu9FHqUXwBl2RvvMA== X-Received: by 10.157.9.252 with SMTP id 57mr189826otz.63.1513616681213; Mon, 18 Dec 2017 09:04:41 -0800 (PST) X-BeenThere: std-proposals@isocpp.org Original-Received: by 10.157.82.173 with SMTP id f45ls210357oth.18.gmail; Mon, 18 Dec 2017 09:04:40 -0800 (PST) X-Received: by 10.202.104.218 with SMTP id o87mr344753oik.169.1513616680076; Mon, 18 Dec 2017 09:04:40 -0800 (PST) ARC-Seal: i=1; a=rsa-sha256; t=1513616680; cv=none; d=google.com; s=arc-20160816; b=poxelYg8c0LbXyUtrqM4ZbMBqRHQe14uETTFhgHLRTosEb6CDzq6hOx2dLHtgCnQqI 9/GSX436okcMenb0wArwTsyRvpj7iEHLD0fgcz7Nbosw/LTQqc+RYC/Y34LbMBJCJ/hR cSGXBDZbknOA11fWM7vgIhuHHdgxovpTJbCf1JKE4bWjtuVD/raSrlOj3JNG95sBFSha q9Zd0GJa3yrarUVrAn3mLEQnVWFocOUWt141EbMcFNFIFSLHQI31S1VjFbpzZ3czcLAO KZeITcG1Y2VDOGuSOXZwxhC56kK6uz5YJ3C33064nGcHSkfF3kRy0qYQ4Hnf/7ZPAX5z h1CQ== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=to:subject:message-id:date:from:references:in-reply-to:mime-version :dkim-signature:arc-authentication-results; bh=Dy9eFZbnW75lHU4Zh3xI7j5uyE79rlxT5aeyUZtqHus=; b=fGIC/WU2dTu+MR1iu/pjU56FKqHcCpaNr00yl9YLqSrqMHCl7xLqbfmiTcGPy+0KD8 B//jJOrXQDWdqFzK+dePZnT0zwTIwFPwqbQV5FHkvIAhSWE9ngRCvMZRHd4pGIhR0Lt9 e08o7MdggixzwGC8Gq0VWQ6ObSC+xsUVrn3f886DJsugxUPdHx02l0dzPuAQaPUF+evf BXhgth49ixgZw96v05AacwiPhEoY8yUCkBC3xcH8NYkdW+3CIhr0IXApUxLyNCSUAryM JacN6ScJM3sEoor8xA8to7x19KUqHWjUYyo8IemUUNplsMnWaRGH8cYqW/WQui1YzlMA OwLQ== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@gmail.com header.s=20161025 header.b=uNT3PA4p; spf=pass (google.com: domain of jake.arkinstall@gmail.com designates 209.85.220.41 as permitted sender) smtp.mailfrom=jake.arkinstall@gmail.com; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=gmail.com Original-Received: from mail-sor-f41.google.com (mail-sor-f41.google.com. [209.85.220.41]) by mx.google.com with SMTPS id l51sor447742otb.220.2017.12.18.09.04.40 for (Google Transport Security); Mon, 18 Dec 2017 09:04:40 -0800 (PST) Received-SPF: pass (google.com: domain of jake.arkinstall@gmail.com designates 209.85.220.41 as permitted sender) client-ip=209.85.220.41; X-Received: by 10.157.14.56 with SMTP id c53mr224244otc.81.1513616679546; Mon, 18 Dec 2017 09:04:39 -0800 (PST) Original-Received: by 10.168.69.140 with HTTP; Mon, 18 Dec 2017 09:04:39 -0800 (PST) Original-Received: by 10.168.69.140 with HTTP; Mon, 18 Dec 2017 09:04:39 -0800 (PST) In-Reply-To: <0aeb1cbe-dbdf-4d66-bbe6-2a127b0c1a6c@isocpp.org> X-Original-Sender: jake.arkinstall@gmail.com X-Original-Authentication-Results: mx.google.com; dkim=pass header.i=@gmail.com header.s=20161025 header.b=uNT3PA4p; spf=pass (google.com: domain of jake.arkinstall@gmail.com designates 209.85.220.41 as permitted sender) smtp.mailfrom=jake.arkinstall@gmail.com; dmarc=pass (p=NONE sp=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:35978 Archived-At: --001a113db95482b6c70560a0586f Content-Type: text/plain; charset="UTF-8" On 16 Dec 2017 16:45, "Nicol Bolas" wrote: It is legal code today, so changing its meaning is a breaking change. Not necessarily though. If the array access operator accepts N arguments and M > N arguments are provided, the comma operator can apply. If it accepts N arguments and N arguments are provided, it handles them accordingly. If we follow that rule, then this is not a breaking change - simply because we have no multi-dimensional array access operator. If this proposal does gain some traction, I'd like to see a rectangular array class to go along with it, both as a usage example and for the standard library. -- 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/CAC%2B0CCPh3nTKbGWHVoVXw-W8HMLC5DEhH2eSMmp_Ycv_SbUteg%40mail.gmail.com. --001a113db95482b6c70560a0586f Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable


On 16 Dec 2017 16:45, "Nicol Bolas" <jmckesson@gmail.com> wrote:
It is legal code today, so changing its meaning is a breaki= ng change.
=
Not necessarily though. If the array access ope= rator accepts N arguments and M > N arguments are provided, the comma op= erator can apply. If it accepts N arguments and N arguments are provided, i= t handles them accordingly.=C2=A0

If we follow that rule, then this is not a breaking change - simp= ly because we have no multi-dimensional array access operator.

If this proposal does gain some trac= tion, I'd like to see a rectangular array class to go along with it, bo= th as a usage example and for the standard library.

--
You received this message because you are subscribed to the Google Groups &= quot;ISO C++ Standard - Future Proposals" group.
To unsubscribe from this group and stop receiving emails from it, send an e= mail to std-proposa= ls+unsubscribe@isocpp.org.
To post to this group, send email to std-proposals@isocpp.org.
To view this discussion on the web visit h= ttps://groups.google.com/a/isocpp.org/d/msgid/std-proposals/CAC%2B0CCPh3nTK= bGWHVoVXw-W8HMLC5DEhH2eSMmp_Ycv_SbUteg%40mail.gmail.com.
--001a113db95482b6c70560a0586f-- .