220 4866 article Path: news.gmane.org!not-for-mail From: Zhihao Yuan Newsgroups: gmane.comp.lang.c++.isocpp.proposals Subject: Re: Re: Proposal: std::sequence Date: Tue, 4 Jun 2013 19:20:51 -0400 Lines: 27 Approved: news@gmane.org Message-ID: References: <4551abbc-43aa-4520-a91a-f8eb25a90588@isocpp.org> <2c8e6079-9c87-425a-93e2-39251df57cd8@isocpp.org> <9f1cace3-0503-4a3c-a8ce-d7546564b3ef@isocpp.org> <1c991e6e-6bc3-4822-9ffd-7f2508e63974@isocpp.org> Reply-To: std-proposals@isocpp.org NNTP-Posting-Host: plane.gmane.org Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 X-Trace: ger.gmane.org 1370388055 20486 80.91.229.3 (4 Jun 2013 23:20:55 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Tue, 4 Jun 2013 23:20:55 +0000 (UTC) To: "std-proposals@isocpp.org" Original-X-From: std-proposals+bncBCUILMGRQMARBVHMXGGQKGQERQIWRTQ@isocpp.org Wed Jun 05 01:20:57 2013 Return-path: Envelope-to: gclcip-std-proposals@m.gmane.org Original-Received: from mail-lb0-f197.google.com ([209.85.217.197]) by plane.gmane.org with esmtp (Exim 4.69) (envelope-from ) id 1Uk0X7-0007UO-Fh for gclcip-std-proposals@m.gmane.org; Wed, 05 Jun 2013 01:20:53 +0200 Original-Received: by mail-lb0-f197.google.com with SMTP id 13sf1293657lba.4 for ; Tue, 04 Jun 2013 16:20:53 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=x-beenthere: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:x-google-group-id :list-post:list-help:list-archive:list-subscribe:list-unsubscribe :content-type; bh=lFmHyFWQbvN4+Mm3M9XKJX5H/ZkNMESuujJSTiHK2dk=; b=tnDcDLD3crtPSr6ybNM5NmNvHzyjq/q5Zu2OQ7thOWVYVVh4EAIAoR61skkxRsSusK RL4lmE9K6VeNpLEtZ9yoa7Ue/II1qH2WVkjjROX62quclPf8q5f5DTtWoGzN1i43GUm/ ZUsKSrm2jvyRXHzYzFHgNOUVUR3XSgMnUfo8eTuda6bbEXgN7dxVXPywDie8Kg4enaKG WNvXyRTSleB4q9LRb+AXOG4y/+1r2DCI8Qklznr+UiS8vblgy2t+CCuMnoP1fV8X4qCz te5QawAirHDUHVVBJfHiDJ9G2udipHgp7XRRVTpxkA0G6Ejfcz/KU6+8JVvo9Rir/QcJ cltg== X-Received: by 10.152.20.70 with SMTP id l6mr7047244lae.0.1370388052805; Tue, 04 Jun 2013 16:20:52 -0700 (PDT) X-BeenThere: std-proposals@isocpp.org Original-Received: by 10.152.120.136 with SMTP id lc8ls34691lab.22.gmail; Tue, 04 Jun 2013 16:20:51 -0700 (PDT) X-Received: by 10.152.21.99 with SMTP id u3mr14193848lae.27.1370388051550; Tue, 04 Jun 2013 16:20:51 -0700 (PDT) Original-Received: from mail-la0-x229.google.com (mail-la0-x229.google.com [2a00:1450:4010:c03::229]) by mx.google.com with ESMTPS id zo5si18888678lbb.219.2013.06.04.16.20.51 for (version=TLSv1 cipher=ECDHE-RSA-RC4-SHA bits=128/128); Tue, 04 Jun 2013 16:20:51 -0700 (PDT) Received-SPF: pass (google.com: domain of lichray@gmail.com designates 2a00:1450:4010:c03::229 as permitted sender) client-ip=2a00:1450:4010:c03::229; Original-Received: by mail-la0-f41.google.com with SMTP id fn20so830126lab.28 for ; Tue, 04 Jun 2013 16:20:51 -0700 (PDT) X-Received: by 10.152.29.169 with SMTP id l9mr14187271lah.31.1370388051240; Tue, 04 Jun 2013 16:20:51 -0700 (PDT) Original-Received: by 10.112.146.99 with HTTP; Tue, 4 Jun 2013 16:20:51 -0700 (PDT) In-Reply-To: X-Original-Sender: lichray@gmail.com X-Original-Authentication-Results: mx.google.com; spf=pass (google.com: domain of lichray@gmail.com designates 2a00:1450:4010:c03::229 as permitted sender) smtp.mail=lichray@gmail.com; dkim=pass header.i=@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:4866 Archived-At: On Tue, Jun 4, 2013 at 6:54 PM, Jeffrey Yasskin wrote: > Yeah, you might see a performance difference for non-const > array_ref<>s where the compiler can't assume they don't change. Just think const-correctness does not help optimizer. http://stackoverflow.com/a/6313818 Aliasing is the thing matters, const-correctness is irrelevant. -- Zhihao Yuan, ID lichray The best way to predict the future is to invent it. ___________________________________________________ 4BSD -- http://4bsd.biz/ -- --- 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/?hl=en. .