220 8327 article Path: news.gmane.org!not-for-mail From: Bo Persson Newsgroups: gmane.comp.lang.c++.isocpp.proposals Subject: Re: Proposal: Default swap operation Date: Wed, 01 Jan 2014 17:07:53 +0100 Lines: 53 Approved: news@gmane.org Message-ID: References: <68012381-8af4-4d62-a5a4-912c454fba96@isocpp.org> <52C4339B.20701@gmail.com> Reply-To: std-proposals@isocpp.org NNTP-Posting-Host: plane.gmane.org Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed X-Trace: ger.gmane.org 1388592485 11351 80.91.229.3 (1 Jan 2014 16:08:05 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Wed, 1 Jan 2014 16:08:05 +0000 (UTC) To: std-proposals@isocpp.org Original-X-From: std-proposals+bncBCZ6RLW3UIKBB2H2SCLAKGQEREMJB5I@isocpp.org Wed Jan 01 17:08:09 2014 Return-path: Envelope-to: gclcip-std-proposals@m.gmane.org Original-Received: from mail-we0-f198.google.com ([74.125.82.198]) by plane.gmane.org with esmtp (Exim 4.69) (envelope-from ) id 1VyOL2-0006fi-Uk for gclcip-std-proposals@m.gmane.org; Wed, 01 Jan 2014 17:08:09 +0100 Original-Received: by mail-we0-f198.google.com with SMTP id q58sf22055666wes.9 for ; Wed, 01 Jan 2014 08:08:08 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:to:from:subject:date:lines:message-id:references :mime-version:user-agent:in-reply-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=OwYhyNmEF/9tF7N6vBmIb0MZ4OhYB5j+baztItb7HTg=; b=LL4hX86tUnOazE3dLSA24wOb8gHpZC3klLnA8h8gYfNXUDu1iHqbsnKkGNowdLtx7p XccySANLDAMVpsfBjXCGfoQ6Q977alLs4pIcAgr5OsCm2mg8JWUwv7kYWi4lMob5+8LR 52QY+41kS13Ch2KUf2qelK59DPpS5vsLCuxy5oT003ECh5qZf1sSeAVpuvVfnKzrZFfQ QLna9HRQ2wLtddQHA3yRE+wWu+3OSLdOJ3/uljnfX3HMmAMEV9ulykrm5dtrHlectyBT mZEUL7fQ6FMSWOIp7H+I9EkMC7YPpjRkKgxZtNelZEUMtBWWyZqH4/KKOpdq1dwgDx5M QE9g== X-Gm-Message-State: ALoCoQkjRhy8NfKgsqvBIYAfUGZ6PfpwatSUUbECHiWvffc7xTnwGNuYJD1uAIIpsnsYaBqjua++ X-Received: by 10.152.9.36 with SMTP id w4mr30442410laa.0.1388592488480; Wed, 01 Jan 2014 08:08:08 -0800 (PST) X-BeenThere: std-proposals@isocpp.org Original-Received: by 10.152.37.99 with SMTP id x3ls530834laj.18.gmail; Wed, 01 Jan 2014 08:08:07 -0800 (PST) X-Received: by 10.152.120.231 with SMTP id lf7mr17247489lab.36.1388592487686; Wed, 01 Jan 2014 08:08:07 -0800 (PST) Original-Received: from plane.gmane.org (plane.gmane.org. [80.91.229.3]) by mx.google.com with ESMTPS id h4si26759723lam.116.2014.01.01.08.08.07 for (version=TLSv1 cipher=RC4-SHA bits=128/128); Wed, 01 Jan 2014 08:08:07 -0800 (PST) Received-SPF: pass (google.com: domain of gclcip-std-proposals@m.gmane.org designates 80.91.229.3 as permitted sender) client-ip=80.91.229.3; Original-Received: from list by plane.gmane.org with local (Exim 4.69) (envelope-from ) id 1VyOL1-0006aN-0U for std-proposals@isocpp.org; Wed, 01 Jan 2014 17:08:07 +0100 Original-Received: from c193-14-6-157.cust.tele2.se ([193.14.6.157]) by main.gmane.org with esmtp (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Wed, 01 Jan 2014 17:08:07 +0100 Original-Received: from bop by c193-14-6-157.cust.tele2.se with local (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Wed, 01 Jan 2014 17:08:07 +0100 X-Injected-Via-Gmane: http://gmane.org/ Original-Lines: 44 Original-X-Complaints-To: usenet@ger.gmane.org X-Gmane-NNTP-Posting-Host: c193-14-6-157.cust.tele2.se User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:24.0) Gecko/20100101 Thunderbird/24.2.0 In-Reply-To: <52C4339B.20701@gmail.com> X-Original-Sender: gclcip-std-proposals@m.gmane.org X-Original-Authentication-Results: mx.google.com; spf=pass (google.com: domain of gclcip-std-proposals@m.gmane.org designates 80.91.229.3 as permitted sender) smtp.mail=gclcip-std-proposals@m.gmane.org 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:8327 Archived-At: Matthew Woehlke skrev 2014-01-01 16:26: > On 2013-12-31 21:05, fmatthew5876@gmail.com wrote: >> On Tuesday, December 31, 2013 8:53:46 PM UTC-5, Billy O'Neal wrote: >>> The other issue here is that "using std::swap" would require including >>> ... >> >> Implementing swap yourself in this way requires the same. > > I think the problem here is that the *header* would need to include it. > > Related to that note, I wonder if we should allow e.g.: > > foo.h > ----- > class Foo > { > ... > ~Foo(); > ... > } > > foo.cpp > ------- > > Foo::~Foo() = default; > > > IOW, allow uses of '= default' after declaration, to allow the compiler > to emit the default implementation at the source level rather than the > header level. This would be great for classes where the default > implementation would require a complete declaration of a type that > otherwise could be forward declared. (Especially thinking of > 'unique_ptr', for which the dtor needs the definition of > Private, but otherwise Private could be forward declared.) > > In this case, this would solve needing in the header. > But wouldn't this instead cause trouble for , like is_trivially_destructible ? Bo Persson -- --- 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/. .