220 3010 article Path: news.gmane.org!not-for-mail From: "Andrew C. Morrow" Newsgroups: gmane.comp.lang.c++.isocpp.proposals Subject: Re: Re: A proposal to add swap traits to the standard library Date: Wed, 6 Mar 2013 10:36:00 -0500 Lines: 145 Approved: news@gmane.org Message-ID: References: <713d1419-a642-408c-b3ba-44d1a17c2bb8@isocpp.org> <511227BD.9010306@gmail.com> <536643f8-e7bd-447c-8515-6829c42f8425@isocpp.org> <51127060.7010505@gmail.com> <8AB4D2A8-9E07-47C9-9F72-E5DD6D11B1FA@gmail.com> <5115987B.5000507@gmail.com> <778ABE6B-77D6-4349-BAC4-0AECA1F62CA0@gmail.com> <51346F80.9030700@gmail.com> Reply-To: std-proposals@isocpp.org NNTP-Posting-Host: plane.gmane.org Mime-Version: 1.0 Content-Type: multipart/alternative; boundary=bcaec54eea70dba85004d7435858 X-Trace: ger.gmane.org 1362584162 26684 80.91.229.3 (6 Mar 2013 15:36:02 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Wed, 6 Mar 2013 15:36:02 +0000 (UTC) Cc: std-proposals@isocpp.org To: =?ISO-8859-1?Q?Mikael_Kilpel=E4inen?= Original-X-From: std-proposals+bncBDDP5Z6JXQHBBYOE3WEQKGQE2ZP3AWA@isocpp.org Wed Mar 06 16:36:25 2013 Return-path: Envelope-to: gclcip-std-proposals@m.gmane.org Original-Received: from mail-ee0-f70.google.com ([74.125.83.70]) by plane.gmane.org with esmtp (Exim 4.69) (envelope-from ) id 1UDGOG-0002kx-7y for gclcip-std-proposals@m.gmane.org; Wed, 06 Mar 2013 16:36:24 +0100 Original-Received: by mail-ee0-f70.google.com with SMTP id l10sf11396447eei.9 for ; Wed, 06 Mar 2013 07:36:02 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=x-received:x-beenthere:x-received:received-spf:mime-version :x-received:in-reply-to:references:date:message-id:subject:from:to :cc:x-original-sender:x-original-authentication-results:reply-to :precedence:mailing-list:list-id:x-google-group-id:list-post :list-help:list-archive:list-subscribe:list-unsubscribe:content-type; bh=8w0B5ubtps3MdCc63XWUgjcgvjY5rgz0u253lunS1Nk=; b=YESCRObv879UHPmmKptZLqZyo7K5DDZBzDujqrBGqfeeSvoBHYeAGwcto+k397Kex4 R5owkUvXkJ7aweIGiYpKgv8KxOlEv4VSdPAAxgr2BOHJ6On88JrHkA4AClAXaGkkruEj Mct0y/g7D+dXs1hK71Jn7ft2xiXjLUuRWK25qlGtOk6qKzD50U23Xq3X0MHCtkvgVKeZ jlfKlyPK1eMbeLOT5WQI84HoUluFmNP8qNnUZCFHKf/w5gYlrpCQ/wjO+wGgTWK6wICn To6wse6gwgvHxAbv4ccUB9FWb6UFNMm8D50hOHUsuhV604m6XhI/FgxSdYjBHlTeETS X-Received: by 10.112.10.36 with SMTP id f4mr386054lbb.7.1362584162294; Wed, 06 Mar 2013 07:36:02 -0800 (PST) X-BeenThere: std-proposals@isocpp.org Original-Received: by 10.152.122.43 with SMTP id lp11ls207712lab.4.gmail; Wed, 06 Mar 2013 07:36:01 -0800 (PST) X-Received: by 10.112.40.167 with SMTP id y7mr7815336lbk.12.1362584160850; Wed, 06 Mar 2013 07:36:00 -0800 (PST) Original-Received: from mail-lb0-f174.google.com (mail-lb0-f174.google.com [209.85.217.174]) by mx.google.com with ESMTPS id l3si11935204lbb.105.2013.03.06.07.36.00 (version=TLSv1 cipher=ECDHE-RSA-RC4-SHA bits=128/128); Wed, 06 Mar 2013 07:36:00 -0800 (PST) Received-SPF: pass (google.com: domain of andrew.c.morrow@gmail.com designates 209.85.217.174 as permitted sender) client-ip=209.85.217.174; Original-Received: by mail-lb0-f174.google.com with SMTP id l12so5799380lbo.33 for ; Wed, 06 Mar 2013 07:36:00 -0800 (PST) X-Received: by 10.152.109.112 with SMTP id hr16mr25561222lab.38.1362584160412; Wed, 06 Mar 2013 07:36:00 -0800 (PST) Original-Received: by 10.112.80.67 with HTTP; Wed, 6 Mar 2013 07:36:00 -0800 (PST) In-Reply-To: <51346F80.9030700@gmail.com> X-Original-Sender: andrew.c.morrow@gmail.com X-Original-Authentication-Results: mx.google.com; spf=pass (google.com: domain of andrew.c.morrow@gmail.com designates 209.85.217.174 as permitted sender) smtp.mail=andrew.c.morrow@gmail.com; dkim=pass header.i=@gmail.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:3010 Archived-At: --bcaec54eea70dba85004d7435858 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable On Mon, Mar 4, 2013 at 4:55 AM, Mikael Kilpel=E4inen < mikael.kilpelainen@gmail.com> wrote: > > Looking good, I will take closer look when I have time but small > remark now.. > > > "The context in which the aforementioned expressions are considered shall > ensure that a candidate set for swap consists of the two swap function > templates defined in (20.2) and the lookup set produced by > argument-dependent lookup (3.4.2)." > > I assume this means one has to explicitly include when ever > these traits are used. > Then the wording seems bit vague though, how do I ensure those swap > functions will be candidates if I don't know how it is implemented? > I would rather see something like "if the header is not include= d > prior to a use of these traits the program is ill-formed". > > Another option would be to specify that the new header includes > which i think is fine, in which case that needs to be added to the synops= is. > > > Mikael > > Thanks Mikael. Your suggestion to just specify that is included by the new header seems better to me. The alternative just introduces yet another way to write an ill-formed program. I've updated the synopsis accordingly. While doing so I realized that some of the section references, names, and titles were made incorrect after changing from Table 51 to Table 49, so I've fixed those up too. http://acmorrow.github.com/swap_traits/nXXXX.html Andrew --=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 http://groups.google.com/a/isocpp.org/group/std-proposa= ls/?hl=3Den. --bcaec54eea70dba85004d7435858 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable



On Mon, Mar 4, 2013 at 4:55 AM, Mikael Kilpel=E4inen <m= ikael.kilpelainen@gmail.com> wrote:
=20 =20 =20

=20
Looking good, I will take closer look when I have time but small remark now..


"The context in which the aforementioned expressions are considere= d shall ensure that a candidate set for swap consists of the two swap function templates defined in <utility> (20.2) and the lookup set produced by argument-dependent lookup (3.4.2)."

I assume this means one has to explicitly include <utility> when ever these traits are used.
Then the wording seems bit=A0 vague though, how do I ensure those swap functions will be candidates if I don't know how it is implemented?=
I would rather see something like "if the header <utility> i= s not included prior to a use of these traits the program is ill-formed".

Another option would be to specify that the new header includes <utility> which i think is fine, in which case that needs to be added to the synopsis.


Mikael


Thanks Mikael.

Your suggestion to just specify that <utility> is in= cluded by the new header seems better to me. The alternative just introduce= s yet another way to write an ill-formed program. I've updated the <= swap_traits> synopsis accordingly.

While doing= so I realized that some of the section references, names, and titles were = made incorrect after changing from Table 51 to Table 49, so I've fixed = those up too.

http://acmorrow.github.c= om/swap_traits/nXXXX.html

Andrew

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