220 12068 <9E8291EE-CD67-4772-A364-0929FD18E295@gmail.com> article Path: news.gmane.org!not-for-mail From: David Krauss Newsgroups: gmane.comp.lang.c++.isocpp.proposals Subject: Re: Re: Variadic catch Date: Fri, 25 Jul 2014 23:32:07 +0800 Lines: 17 Approved: news@gmane.org Message-ID: <9E8291EE-CD67-4772-A364-0929FD18E295@gmail.com> References: <53D270BF.5010906@gmx.de> <3f9efef6-04ec-47d7-807e-0d695bb2eba7@isocpp.org> Reply-To: std-proposals@isocpp.org NNTP-Posting-Host: plane.gmane.org Mime-Version: 1.0 (Mac OS X Mail 7.3 \(1878.6\)) Content-Type: text/plain; charset=ISO-8859-1 X-Trace: ger.gmane.org 1406302346 2888 80.91.229.3 (25 Jul 2014 15:32:26 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Fri, 25 Jul 2014 15:32:26 +0000 (UTC) To: std-proposals@isocpp.org Original-X-From: std-proposals+bncBCW25A7E3QCRB77QZGPAKGQE3OXI4RA@isocpp.org Fri Jul 25 17:32:20 2014 Return-path: Envelope-to: gclcip-std-proposals@m.gmane.org Original-Received: from mail-ie0-f200.google.com ([209.85.223.200]) by plane.gmane.org with esmtp (Exim 4.69) (envelope-from ) id 1XAhTk-0001Wl-Fb for gclcip-std-proposals@m.gmane.org; Fri, 25 Jul 2014 17:32:16 +0200 Original-Received: by mail-ie0-f200.google.com with SMTP id at20sf27945826iec.3 for ; Fri, 25 Jul 2014 08:32:15 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:mime-version:subject:from:in-reply-to:date :message-id:references: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=FVIQz0DahXUuR+453XWWRIXV5KjsIyjRmbC18Gl4oUM=; b=OGffbYK0UZof9NyvDRVHW16zHhhYz/asN996fh8Q2M4ayGwwg3bnKpmYGWrIwW681T B1Jb2rWbUgKJvZroS81NjlBXpC/5qlHYBkQ9bfS7/mcO+ta0LYX3dm4RS55xwfbRa9fg IXiX74VOnHGtxgBE0sqKR2bcJXn1+wktIdcASz0UK1JwixBNPAAMUkmg8rmp3QSoeBzo Xxqzta56RdoI5+vYxPc1sGSACJKRiRlkhtEGLG51M5X0XqytWg/tVNusi5Rp17zDXrzR cT8MQ8PaDG1AwNw8ihhjhZaWM/wb6j9Nq4853sjblaCbBAwtoEKFEi5q9XHY1QLpl0Wy ciRQ== X-Gm-Message-State: ALoCoQmcAMhIraJAAfb6i2Nw8kNlA96VWHipwJ16u7ElmCFgaOxklWyeFHwUm3bJ7gInSL6jsiiS X-Received: by 10.42.177.5 with SMTP id bg5mr7998827icb.27.1406302335527; Fri, 25 Jul 2014 08:32:15 -0700 (PDT) X-BeenThere: std-proposals@isocpp.org Original-Received: by 10.50.3.105 with SMTP id b9ls469298igb.20.canary; Fri, 25 Jul 2014 08:32:14 -0700 (PDT) X-Received: by 10.66.141.76 with SMTP id rm12mr4711954pab.138.1406302334763; Fri, 25 Jul 2014 08:32:14 -0700 (PDT) Original-Received: from mail-pa0-x229.google.com (mail-pa0-x229.google.com [2607:f8b0:400e:c03::229]) by mx.google.com with ESMTPS id yt2si9560436pbb.3.2014.07.25.08.32.14 for (version=TLSv1 cipher=ECDHE-RSA-RC4-SHA bits=128/128); Fri, 25 Jul 2014 08:32:14 -0700 (PDT) Received-SPF: pass (google.com: domain of potswa@gmail.com designates 2607:f8b0:400e:c03::229 as permitted sender) client-ip=2607:f8b0:400e:c03::229; Original-Received: by mail-pa0-f41.google.com with SMTP id rd3so6278846pab.14 for ; Fri, 25 Jul 2014 08:32:14 -0700 (PDT) X-Received: by 10.68.189.105 with SMTP id gh9mr19729786pbc.42.1406302334624; Fri, 25 Jul 2014 08:32:14 -0700 (PDT) Original-Received: from [172.20.10.2] ([121.54.54.152]) by mx.google.com with ESMTPSA id n2sm12124028pdo.32.2014.07.25.08.32.12 for (version=TLSv1 cipher=ECDHE-RSA-RC4-SHA bits=128/128); Fri, 25 Jul 2014 08:32:14 -0700 (PDT) In-Reply-To: <3f9efef6-04ec-47d7-807e-0d695bb2eba7@isocpp.org> X-Mailer: Apple Mail (2.1878.6) X-Original-Sender: potswa@gmail.com X-Original-Authentication-Results: mx.google.com; spf=pass (google.com: domain of potswa@gmail.com designates 2607:f8b0:400e:c03::229 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:12068 Archived-At: That's a rather different thing. Each catch block generically needs its own body. If the bodies are the same, that indicates you should actually be catching std::exception, dynamic_casting to determine compatibility, and perhaps rethrowing. Any case where a single catch block is supposed to inspect either of two classes with no common base, you simply need to add that common base. On 2014-07-25, at 11:26 PM, lorgonjortle@gmail.com wrote: > I can implement sizeof...(Ts) entirely using constexpr function templates, does that mean it shouldn't be a language feature? -- --- 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/. .