220 8342 article Path: news.gmane.org!not-for-mail From: =?UTF-8?Q?Klaim_=2D_Jo=C3=ABl_Lamotte?= Newsgroups: gmane.comp.lang.c++.isocpp.proposals Subject: Re: Proposal: Default swap operation Date: Thu, 2 Jan 2014 01:26:09 +0100 Lines: 97 Approved: news@gmane.org Message-ID: References: Reply-To: std-proposals@isocpp.org NNTP-Posting-Host: plane.gmane.org Mime-Version: 1.0 Content-Type: multipart/alternative; boundary=001a11c2903c10f1c304eef1d7f8 X-Trace: ger.gmane.org 1388622365 3601 80.91.229.3 (2 Jan 2014 00:26:05 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Thu, 2 Jan 2014 00:26:05 +0000 (UTC) To: std-proposals@isocpp.org Original-X-From: std-proposals+bncBD3NR2WQQ4IBBIXESKLAKGQEXCVY2NY@isocpp.org Thu Jan 02 01:26:13 2014 Return-path: Envelope-to: gclcip-std-proposals@m.gmane.org Original-Received: from mail-ob0-f199.google.com ([209.85.214.199]) by plane.gmane.org with esmtp (Exim 4.69) (envelope-from ) id 1VyW71-0007fc-To for gclcip-std-proposals@m.gmane.org; Thu, 02 Jan 2014 01:26:12 +0100 Original-Received: by mail-ob0-f199.google.com with SMTP id gq1sf65930250obb.6 for ; Wed, 01 Jan 2014 16:26:11 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:mime-version:in-reply-to:references:date :message-id:subject:from: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:content-type; bh=zJ5JG2w/o+IVdvvgvDw/e+fppoX07OWEbLiwz9VFp1E=; b=Z/nKtwPClKdU/sQohgct8EkhNOwwOeHilEdT4Ut0dTa028Phe/oWjWnZYVDwJI8F8W cvQ0Sy8cbpWipZC9ELp5wNKLT3JNeplGq/xh5ROhkw4m5TZWLskd+uNmWFkZ3idEmzUJ Hpo+LGherBhgeG38NYyMO6kZdUeLrjhiDX77nxu/h4+hMJECdJ64d0nrmM751pXWvA5T PcubOEPoEQsnrazns8g00fnOJyWdBCxGC/f/lOVw875Jn2Itc8OmT/I54vZK2z1QgubC EpYgs2v9FozJR0QTfMLMmMTNKJ+8EaGGBzoIMON15N1lFg5wUY0bE89vOuPE9cwAnAey kWqA== X-Gm-Message-State: ALoCoQkEvslRXCR1v52O7+UJhxmJbsgBbVZVExG3tOe8EvcR70/Iyl2p/yIsJOrST4rlJSyPW4bq X-Received: by 10.43.100.129 with SMTP id cw1mr1467191icc.30.1388622370986; Wed, 01 Jan 2014 16:26:10 -0800 (PST) X-BeenThere: std-proposals@isocpp.org Original-Received: by 10.49.59.49 with SMTP id w17ls4428385qeq.68.gmail; Wed, 01 Jan 2014 16:26:10 -0800 (PST) X-Received: by 10.229.102.4 with SMTP id e4mr131964282qco.2.1388622370070; Wed, 01 Jan 2014 16:26:10 -0800 (PST) Original-Received: from mail-ob0-x22b.google.com (mail-ob0-x22b.google.com [2607:f8b0:4003:c01::22b]) by mx.google.com with ESMTPS id r7si51157511qar.19.2014.01.01.16.26.10 for (version=TLSv1 cipher=ECDHE-RSA-RC4-SHA bits=128/128); Wed, 01 Jan 2014 16:26:10 -0800 (PST) Received-SPF: pass (google.com: domain of mjklaim@gmail.com designates 2607:f8b0:4003:c01::22b as permitted sender) client-ip=2607:f8b0:4003:c01::22b; Original-Received: by mail-ob0-f171.google.com with SMTP id wp18so13915530obc.16 for ; Wed, 01 Jan 2014 16:26:09 -0800 (PST) X-Received: by 10.182.28.134 with SMTP id b6mr53319304obh.27.1388622369581; Wed, 01 Jan 2014 16:26:09 -0800 (PST) Original-Received: by 10.76.20.142 with HTTP; Wed, 1 Jan 2014 16:26:09 -0800 (PST) In-Reply-To: X-Original-Sender: mjklaim@gmail.com X-Original-Authentication-Results: mx.google.com; spf=pass (google.com: domain of mjklaim@gmail.com designates 2607:f8b0:4003:c01::22b as permitted sender) smtp.mail=mjklaim@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-Google-Group-Id: 399137483710 List-Post: , List-Help: , List-Archive: List-Subscribe: , List-Unsubscribe: , Xref: news.gmane.org gmane.comp.lang.c++.isocpp.proposals:8342 Archived-At: --001a11c2903c10f1c304eef1d7f8 Content-Type: text/plain; charset=ISO-8859-1 On Wed, Jan 1, 2014 at 2:42 AM, wrote: > Writing swap() is one of those boilerplate kinds of things that is usually > trivial but annoying (and error prone when you change data members but > forget to update swap()). > > Why not allow this: > > class Foo { > public: > void swap(Foo& f) = default; > private: > int a; > Bar b; > float c; > Baz* d; > }; > > Which would be the equivalent of this: > > void Foo::swap(Foo& f) { > using std::swap; > swap(a, f.a); > swap(b, f.b); > swap(c, f.c); > swap(d, f.d); > } > > Any reason this wouldn't make it as a proposal? > How would this differ from the swap operator proposal? [1] I don't remember if a discussion about this paper happened around here or if someone talked about how it was received by the committee. [1] http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2013/n3746.pdf -- --- 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. Visit this group at http://groups.google.com/a/isocpp.org/group/std-proposals/. --001a11c2903c10f1c304eef1d7f8 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable



On Wed, Jan 1, 2014 at 2:42 AM, <fmatthew5876@gmail.com&= gt; wrote:
Writing swap() is one of those boilerplat= e kinds of things that is usually trivial but annoying (and error prone whe= n you change data members but forget to update swap()).

Why not allow this:

class Foo {
=A0 public:
=A0 =A0 void swap(Foo& f) =3D default;
=A0 private:
=A0 =A0 int a;
=A0 =A0 Bar b;
=
=A0 =A0 float c;
=A0 =A0 Baz* d;
};

Which would be t= he equivalent of this:

void Foo::swap(Foo& f) = {
=A0 using std::swap;
=A0 swap(a, f.a);
=A0 swap(b,= f.b);
=A0 swap(c, f.c);
=A0 swap(d, f.d);
}
Any reason this wouldn't make it as a proposal?

How would this differ from the swap opera= tor proposal? [1]
I don't remember if a discussion about this paper happened around = here or if someone talked about how it was received by the committee.
=


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