220 22667 article Path: news.gmane.org!not-for-mail From: Jonas Persson Newsgroups: gmane.comp.lang.c++.isocpp.proposals Subject: Re: Unreachable attribute. Date: Mon, 16 Nov 2015 16:46:56 +0100 Lines: 69 Approved: news@gmane.org Message-ID: References: <305866a5-c79d-49f7-ad82-0e359039a5b4@isocpp.org> <2e5eb31c-cb31-4ad0-b901-ed0810e4ac2a@isocpp.org> <564690A9.8040004@gmail.com> Reply-To: std-proposals@isocpp.org NNTP-Posting-Host: plane.gmane.org Mime-Version: 1.0 Content-Type: multipart/alternative; boundary=001a1145aa8caa790d0524aa5155 X-Trace: ger.gmane.org 1447688831 5489 80.91.229.3 (16 Nov 2015 15:47:11 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Mon, 16 Nov 2015 15:47:11 +0000 (UTC) To: std-proposals@isocpp.org Original-X-From: std-proposals+bncBDLJBMEUU4NBB4PUU6ZAKGQEZBRAGDI@isocpp.org Mon Nov 16 16:47:02 2015 Return-path: Envelope-to: gclcip-std-proposals@m.gmane.org Original-Received: from mail-lb0-f200.google.com ([209.85.217.200]) by plane.gmane.org with esmtp (Exim 4.69) (envelope-from ) id 1ZyLzf-00039y-KX for gclcip-std-proposals@m.gmane.org; Mon, 16 Nov 2015 16:46:59 +0100 Original-Received: by lbbpy8 with SMTP id py8sf33041185lbb.0 for ; Mon, 16 Nov 2015 07:46:59 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=isocpp_org.20150623.gappssmtp.com; s=20150623; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :content-type:x-original-sender:x-original-authentication-results :reply-to:precedence:mailing-list:list-id:x-spam-checked-in-group :list-post:list-help:list-archive:list-subscribe:list-unsubscribe; bh=M74qWId4qgNKK5qxX80fVNXqZTQ79apDNuUZKbGHEuw=; b=kVHzQMtRcJaYQJfeuQVWCC9YqRrRL5qIejW2m4HV11HwL7qn/Rbko/U1voLKtnnmz6 +voJ9w9jn2Wre2iLfDnyUq4Or1xo6/0FlcRNenbEl4NmlC3kS9jz1f+zhVpydJUZbjDh hV2H1rk4ldKsmGcKHYibC9SNRH/tAs4qbSIBv0yxJwxvU8QBBqaXZZ1+LJRV8JwgpKQT CiemIlnU+lmI85bAgapIzCTQFUSvj01pVB7OioR3FV3UWrwQW5nx+WIZyp849mUHWmES 1XIDJIAnNf0wZRVx5BKqo1MHxrfjVAAkt6K/wz57KEcuKULb6BQPbvgDQYdEqbtjUGgp nMLQ== 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:content-type:x-original-sender :x-original-authentication-results:reply-to:precedence:mailing-list :list-id:x-spam-checked-in-group:list-post:list-help:list-archive :list-subscribe:list-unsubscribe; bh=M74qWId4qgNKK5qxX80fVNXqZTQ79apDNuUZKbGHEuw=; b=ioKuqNUVODp3GCqyPBCT/Sc6ndN+hp75M1PDEItdCI4U+g3vbL+iHlDZBHbOKu6l2E n60wD2eoE5rJMMnJ/GhZwmJkZIUMj+kREh3R4CR4iTyi0znikhee8lb95sgGukuZ4FHY 7vDpMgWL1LXRjUBhnN9UDauSE/CCPo0sH5AKjOPH1Bw64lWpP6FQy1M0+jc5UOtia4Hp axsnrDoXcUlw3q0N/tkMmnhKP5bAg8Zm4H9X1FOYPTUHWjardLpmn4o8brYRXpiK400d Ka92eQdJ1iIbikXxjtSSRD5zejDoVBUUxCzSg5vx8hdi8A4WBeUnJ/n7dxVAfYBpSYzx NMWg== X-Gm-Message-State: ALoCoQnNkR7nqZh5M7XAa1B19hfnX9ygtvnd+YbqUD05k+puvdwaWKpMXLWMF2pUF3XpMpmoKiJ7 X-Received: by 10.194.246.129 with SMTP id xw1mr5344328wjc.6.1447688818921; Mon, 16 Nov 2015 07:46:58 -0800 (PST) X-BeenThere: std-proposals@isocpp.org Original-Received: by 10.28.136.143 with SMTP id k137ls698290wmd.28.canary; Mon, 16 Nov 2015 07:46:57 -0800 (PST) X-Received: by 10.28.194.135 with SMTP id s129mr17554390wmf.38.1447688817141; Mon, 16 Nov 2015 07:46:57 -0800 (PST) Original-Received: from mail-wm0-x234.google.com (mail-wm0-x234.google.com. [2a00:1450:400c:c09::234]) by mx.google.com with ESMTPS id ot8si46677905wjc.163.2015.11.16.07.46.57 for (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Mon, 16 Nov 2015 07:46:57 -0800 (PST) Received-SPF: pass (google.com: domain of l.j.persson@gmail.com designates 2a00:1450:400c:c09::234 as permitted sender) client-ip=2a00:1450:400c:c09::234; Original-Received: by wmww144 with SMTP id w144so115972869wmw.1 for ; Mon, 16 Nov 2015 07:46:57 -0800 (PST) X-Received: by 10.28.93.70 with SMTP id r67mr18418262wmb.16.1447688816717; Mon, 16 Nov 2015 07:46:56 -0800 (PST) Original-Received: by 10.28.157.148 with HTTP; Mon, 16 Nov 2015 07:46:56 -0800 (PST) In-Reply-To: <564690A9.8040004@gmail.com> X-Original-Sender: l.j.persson@gmail.com X-Original-Authentication-Results: mx.google.com; spf=pass (google.com: domain of l.j.persson@gmail.com designates 2a00:1450:400c:c09::234 as permitted sender) smtp.mailfrom=l.j.persson@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-Spam-Checked-In-Group: std-proposals@isocpp.org 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:22667 Archived-At: --001a1145aa8caa790d0524aa5155 Content-Type: text/plain; charset=UTF-8 On Sat, Nov 14, 2015 at 2:38 AM, Miro Knejp wrote: > > That already happens, though it is far from "random". The compiler will > happily remove code that depends on UB at higher optimization levels. > Whether you expected it to run or not, or whether that annoys you, it does > not care. > The issue was not if UB is allowed to remove code or not. I have no problem with that. The issue was that a precondition validate should be ill-formed rather that UB. / Jonas -- --- 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/. --001a1145aa8caa790d0524aa5155 Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: quoted-printable

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