220 8236 <52B8D5AE.5050109@gmail.com> article Path: news.gmane.org!not-for-mail From: David Krauss Newsgroups: gmane.comp.lang.c++.isocpp.proposals Subject: Re: Continuing with "auto" and destructors Date: Tue, 24 Dec 2013 08:30:38 +0800 Lines: 37 Approved: news@gmane.org Message-ID: <52B8D5AE.5050109@gmail.com> References: 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 1387845041 11843 80.91.229.3 (24 Dec 2013 00:30:41 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Tue, 24 Dec 2013 00:30:41 +0000 (UTC) To: std-proposals@isocpp.org Original-X-From: std-proposals+bncBCW25A7E3QCRBM5L4OKQKGQETRUCUMQ@isocpp.org Tue Dec 24 01:30:47 2013 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 1VvFtV-0005b9-I7 for gclcip-std-proposals@m.gmane.org; Tue, 24 Dec 2013 01:30:45 +0100 Original-Received: by mail-ob0-f199.google.com with SMTP id gq1sf25701098obb.2 for ; Mon, 23 Dec 2013 16:30:44 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:message-id:date:from:user-agent:mime-version:to :subject:references: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=Yo9QvMpRMdcnOz0mCYmc75OPrlOC/EHKiL47j1X1BcI=; b=nAfHFo2Vg5Uqkcl7QtfJfiSOkOSNCaJ3IcCPhNzHJc9oFhlmSZNbpahksWMJn6KE4B +BXcv50A3dWuFHdFLdMX2oAm5gH9mGacdF0E/Sw35vGkdarqeWRocS3ucIk29pCHLiJQ /yHGy3+cP5VTE8W//ydW/L4P+KSqVTDbOfxpQnKxJaR2YelIuYVjF2MqYxbGDI7rU+CQ ue/3CWuCNwNn5z+xhhFoToK8m7mOx8czBv89INjk9JrhKW5jPojnCmLvC2bBB/D7W3pl top6zTiUoEdCjUaXff6kepznPz9pkXKZrETlx9Clil0hrfi4A3X62RkSwzvAQoN/Pi+P sXgQ== X-Gm-Message-State: ALoCoQkWBc+gy6zCDoXnCBmSobGikCuPDZHkItxZ3jXQOKZVIHFzMVfD1JFxmCLWdt5bj20KaCE9 X-Received: by 10.182.74.226 with SMTP id x2mr11333883obv.1.1387845044320; Mon, 23 Dec 2013 16:30:44 -0800 (PST) X-BeenThere: std-proposals@isocpp.org Original-Received: by 10.49.37.195 with SMTP id a3ls1787565qek.88.gmail; Mon, 23 Dec 2013 16:30:43 -0800 (PST) X-Received: by 10.236.77.231 with SMTP id d67mr34632yhe.113.1387845043844; Mon, 23 Dec 2013 16:30:43 -0800 (PST) Original-Received: from mail-ob0-x22a.google.com (mail-ob0-x22a.google.com [2607:f8b0:4003:c01::22a]) by mx.google.com with ESMTPS id v1si19349253yhg.226.2013.12.23.16.30.43 for (version=TLSv1 cipher=ECDHE-RSA-RC4-SHA bits=128/128); Mon, 23 Dec 2013 16:30:43 -0800 (PST) Received-SPF: pass (google.com: domain of potswa@gmail.com designates 2607:f8b0:4003:c01::22a as permitted sender) client-ip=2607:f8b0:4003:c01::22a; Original-Received: by mail-ob0-f170.google.com with SMTP id wp18so6076084obc.15 for ; Mon, 23 Dec 2013 16:30:43 -0800 (PST) X-Received: by 10.60.84.138 with SMTP id z10mr19680785oey.4.1387845043491; Mon, 23 Dec 2013 16:30:43 -0800 (PST) Original-Received: from Davids-MacBook-Pro.local ([121.54.54.60]) by mx.google.com with ESMTPSA id g4sm25802360obe.5.2013.12.23.16.30.41 for (version=TLSv1 cipher=ECDHE-RSA-RC4-SHA bits=128/128); Mon, 23 Dec 2013 16:30:42 -0800 (PST) User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.8; rv:24.0) Gecko/20100101 Thunderbird/24.2.0 In-Reply-To: X-Original-Sender: potswa@gmail.com X-Original-Authentication-Results: mx.google.com; spf=pass (google.com: domain of potswa@gmail.com designates 2607:f8b0:4003:c01::22a as permitted sender) smtp.mail=potswa@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:8236 Archived-At: On 12/24/13 8:11 AM, Johannes Schaub wrote: > Now that in C++14 we will have > > x -> ~auto() News to me. How is this allowed? Referring to N3797, I don't see any provision in the grammar of 5.2 [expr.post], or in 5.2.5 [expr.pseudo] or 7.1.6.4 [dcl.spec.auto] which explicitly limits usage of auto. > Why not allow that notion when declaring the destructor aswell? And > why not also for the constructor? > > struct A { > auto() { } > ~auto() { } > }; > Because it looks like nonsense. It would be more expressive to allow such for decltype(*this), but alas it would be a breaking change because that refers to the enclosing class in a local class within a nonstatic member function. Also, constructors and destructors cannot be declared using typedef names or other type-ids; this is already explicitly forbidden. It would be nice to otherwise provide universal syntax for "the enclosing class." -- --- You received this message because you are subscribed to the Google Groups "ISO C++ Standard - Future Proposals" group. 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