220 8727 article Path: news.gmane.org!not-for-mail From: Nevin Liber Newsgroups: gmane.comp.lang.c++.isocpp.proposals Subject: Re: string_view::is_null() Date: Mon, 20 Jan 2014 00:01:16 -0600 Lines: 70 Approved: news@gmane.org Message-ID: References: <104254A6-C69A-4571-8455-89D7E466D493@gmail.com> <6a95bf9c-55c9-4ae2-966f-d1b1f4df6a37@isocpp.org> <52D9E336.1060801@knejp.de> <1B534FD7-B385-4A7E-A718-3C73F0AB61DC@gmail.com> <11f13f8f-1270-427c-8942-94027a181ff4@isocpp.org> <20140119174431.GA16875@faust.lysator.liu.se> <20140119192238.GA19497@faust.lysator.liu.se> <60842af6-5ec4-4364-b2d5-a0be9d578bd6@isocpp.org> <6c82c4ae-c144-443a-81b2-ea1a6b645601@isocpp.org> Reply-To: std-proposals@isocpp.org NNTP-Posting-Host: plane.gmane.org Mime-Version: 1.0 Content-Type: multipart/alternative; boundary=f46d0421a6391fae4f04f060a164 X-Trace: ger.gmane.org 1390197711 11659 80.91.229.3 (20 Jan 2014 06:01:51 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Mon, 20 Jan 2014 06:01:51 +0000 (UTC) To: "std-proposals@isocpp.org" Original-X-From: std-proposals+bncBCE35H5S6IDBBVXX6KLAKGQE2J7GEYQ@isocpp.org Mon Jan 20 07:01:59 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 1W57vr-0002R4-27 for gclcip-std-proposals@m.gmane.org; Mon, 20 Jan 2014 07:01:59 +0100 Original-Received: by mail-we0-f198.google.com with SMTP id p61sf11262856wes.9 for ; Sun, 19 Jan 2014 22:01:58 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:mime-version:sender:in-reply-to:references:from :date:message-id:subject: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=ExApF5/kstaanXOVpRdJA41b6gt55A9jpQBfVV/hDwM=; b=K8QC1U73li4g+VR8usGBnZgkpdX/pKTdF8+VBHbUlTaajYvZzz0j+Emq+EFXcDL3Xt aHa27naBoASx4oyX6YjZPjQslKsAFnNMvkLQ6z1FgJFdSImUjN4oewngR8sPMlqJybKK qkmhVEQ3rf3Ns59wcKexz+vep8Erv5CeRhtmsyaJn1kl0ROg1dhh7HELcFK8ciJjeTVU GMvCLRHIOJtr04AJId0htTMSx7LLSo4qWTZUFKePpje8YrxSoqZXIHmdXWLqzsSAJgtE po+HkB216yg66iUk2KdgDLhot06HWnYj0X0tqqWTFDqDWTa95x5SwTZp4n1NUFPMNnON KL3g== X-Gm-Message-State: ALoCoQk2WcmngImmaD1G6weMFTklaDWV8UpO6US3TbveL+oXuyUWqKwNRL94M9qCoQpk/UNwvG4+ X-Received: by 10.15.51.132 with SMTP id n4mr7358177eew.3.1390197718766; Sun, 19 Jan 2014 22:01:58 -0800 (PST) X-BeenThere: std-proposals@isocpp.org Original-Received: by 10.180.77.229 with SMTP id v5ls417269wiw.23.canary; Sun, 19 Jan 2014 22:01:58 -0800 (PST) X-Received: by 10.180.80.103 with SMTP id q7mr8545884wix.14.1390197718082; Sun, 19 Jan 2014 22:01:58 -0800 (PST) Original-Received: from mail-we0-x236.google.com (mail-we0-x236.google.com [2a00:1450:400c:c03::236]) by mx.google.com with ESMTPS id j20si115704wiw.85.2014.01.19.22.01.57 for (version=TLSv1 cipher=ECDHE-RSA-RC4-SHA bits=128/128); Sun, 19 Jan 2014 22:01:57 -0800 (PST) Received-SPF: pass (google.com: domain of nliber@gmail.com designates 2a00:1450:400c:c03::236 as permitted sender) client-ip=2a00:1450:400c:c03::236; Original-Received: by mail-we0-f182.google.com with SMTP id w62so6597581wes.13 for ; Sun, 19 Jan 2014 22:01:57 -0800 (PST) X-Received: by 10.180.79.106 with SMTP id i10mr8331473wix.23.1390197717575; Sun, 19 Jan 2014 22:01:57 -0800 (PST) Original-Sender: nliber@gmail.com Original-Received: by 10.194.121.163 with HTTP; Sun, 19 Jan 2014 22:01:16 -0800 (PST) In-Reply-To: <6c82c4ae-c144-443a-81b2-ea1a6b645601@isocpp.org> X-Original-Sender: nevin@eviloverlord.com X-Original-Authentication-Results: mx.google.com; spf=pass (google.com: domain of nliber@gmail.com designates 2a00:1450:400c:c03::236 as permitted sender) smtp.mail=nliber@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:8727 Archived-At: --f46d0421a6391fae4f04f060a164 Content-Type: text/plain; charset=ISO-8859-1 On 19 January 2014 22:07, Paul Tessier wrote: > Why would ( nullptr, 3 ) be considered an empty view? > It would be undefined behavior. My personal preference for all this is that string_view(nullptr, 0) be allowed, and it is a Quality of Implementation issue whether or not sv.data() can ever return a nullptr; i.e., it would be allowed to return any legal pointer it wants for an empty string_view. > -- > Nevin ":-)" Liber (847) 691-1404 -- --- 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/. --f46d0421a6391fae4f04f060a164 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable
On 19 January 2014 22:07, Paul Tessier &= lt;phernost@gmail.c= om> wrote:
Why would ( nullptr, 3 ) be considered an empty view?

It would be undefined behavior.

My personal preference for all this is that string_view= (nullptr, 0) be allowed, and it is a Quality of Implementation issue whethe= r or not sv.data() can ever return a nullptr; i.e., it would be allowed to = return any legal pointer it wants for an empty string_view.
--=A0
<= /blockquote>
=A0Nevin ":-)" Liber=A0 <mailto:nevin@eviloverlord.com&= gt;=A0 (847) 691-1404

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