220 8674 <52D9E336.1060801@knejp.de> article Path: news.gmane.org!not-for-mail From: Miro Knejp Newsgroups: gmane.comp.lang.c++.isocpp.proposals Subject: Re: string_view::is_null() Date: Sat, 18 Jan 2014 03:13:10 +0100 Lines: 17 Approved: news@gmane.org Message-ID: <52D9E336.1060801@knejp.de> References: <8045a4d2-721d-4725-8bb7-7a91b6f53ec8@isocpp.org> <186E0927-C962-4E34-AED0-E7509DD1F0A0@gmail.com> <7aad44d8-6b4e-438a-b309-bd898b994b34@isocpp.org> <9C2C439F-7983-4224-B272-53CAD0E2E456@gmail.com> <8E74B747-7450-41E0-8D1E-48C2D6F81535@gmail.com> <104254A6-C69A-4571-8455-89D7E466D493@gmail.com> <6a95bf9c -55c9-4ae2-966f-d1b1f4df6a37@isocpp.org> Reply-To: std-proposals@isocpp.org NNTP-Posting-Host: plane.gmane.org Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8; format=flowed X-Trace: ger.gmane.org 1390011187 2910 80.91.229.3 (18 Jan 2014 02:13:07 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Sat, 18 Jan 2014 02:13:07 +0000 (UTC) To: std-proposals@isocpp.org Original-X-From: std-proposals+bncBC6ONSXJ54LBBMOG46LAKGQEIVWZM7Q@isocpp.org Sat Jan 18 03:13:12 2014 Return-path: Envelope-to: gclcip-std-proposals@m.gmane.org Original-Received: from mail-bk0-f70.google.com ([209.85.214.70]) by plane.gmane.org with esmtp (Exim 4.69) (envelope-from ) id 1W4LPG-0001XZ-UA for gclcip-std-proposals@m.gmane.org; Sat, 18 Jan 2014 03:13:06 +0100 Original-Received: by mail-bk0-f70.google.com with SMTP id u12sf8447113bkz.5 for ; Fri, 17 Jan 2014 18:13:06 -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=piW7rbbdTLcEJdOfKTpgQM4+Zx8zzIWieOO7GDYlD3o=; b=kKL87FD2haFJpXm452VIDbmKmFO/ZFkvBhpaOi5RGPuimXFh3pWaYt5GtmJEy89f7w NHT/V3sqVTAkeYJ+XMooY35cAG3DKMUStmu1nWbb+WpHzkWyJFdAwR7n+uWzIWLUccuY DHlQRiCjtXcLYmSXTmejCiYpPo8ixwutZehqBGYpdsxrSIongVRnJUXfvnkNaDuOkLqL RJEVWCc2c4udd6bLGnm6E2NJQYxK/11ijV/wH82b122MPkXZNhJEKZ4qXytmIhGaKurm 4iuPnH7rwxBfJBh7W8mv/GdNw0vsydXnC+qOSoUc46nxZe1FNH3Xo/hX6w5x+0WUoq8G Gt3Q== X-Gm-Message-State: ALoCoQnttG/XkjJZfwHw0/3qfuylb/FjsM80zZETLnBln2T5lxhuAiEgTXyIXU9+6bULbHyP8FIf X-Received: by 10.112.135.232 with SMTP id pv8mr2425148lbb.15.1390011186419; Fri, 17 Jan 2014 18:13:06 -0800 (PST) X-BeenThere: std-proposals@isocpp.org Original-Received: by 10.181.12.101 with SMTP id ep5ls200025wid.40.gmail; Fri, 17 Jan 2014 18:13:05 -0800 (PST) X-Received: by 10.14.225.195 with SMTP id z43mr5769371eep.19.1390011185199; Fri, 17 Jan 2014 18:13:05 -0800 (PST) Original-Received: from mail-out.m-online.net (mail-out.m-online.net. [212.18.0.9]) by mx.google.com with ESMTPS id p46si23792434eem.105.2014.01.17.18.13.05 for (version=TLSv1 cipher=RC4-SHA bits=128/128); Fri, 17 Jan 2014 18:13:05 -0800 (PST) Received-SPF: neutral (google.com: 212.18.0.9 is neither permitted nor denied by best guess record for domain of miro@knejp.de) client-ip=212.18.0.9; Original-Received: from frontend1.mail.m-online.net (unknown [192.168.8.180]) by mail-out.m-online.net (Postfix) with ESMTP id 3f5jNJ6KvLz4KK4F for ; Sat, 18 Jan 2014 03:13:04 +0100 (CET) Original-Received: from www.knejp.de (ppp-188-174-8-128.dynamic.mnet-online.de [188.174.8.128]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by mail.mnet-online.de (Postfix) with SMTP id 3f5jNJ4PB4zbbh2 for ; Sat, 18 Jan 2014 03:13:04 +0100 (CET) Original-Received: from [192.168.42.4] ([192.168.42.4]) by www.knejp.de ; Sat, 18 Jan 2014 03:13:01 +0100 User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:24.0) Gecko/20100101 Thunderbird/24.2.0 In-Reply-To: <6a95bf9c-55c9-4ae2-966f-d1b1f4df6a37@isocpp.org> X-Original-Sender: miro@knejp.de X-Original-Authentication-Results: mx.google.com; spf=neutral (google.com: 212.18.0.9 is neither permitted nor denied by best guess record for domain of miro@knejp.de) smtp.mail=miro@knejp.de 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:8674 Archived-At: > > - both of these methods are impossible if the presumptions stated > above "begin() should never return nullptr" and "we don't need a > special is_null()". Well, not entirely. Of course you could create > some bogus object and use its address instead of nullptr. > Why not set the string_view to "" in the default constructor? -- --- 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/. .