220 8705 <52DC4245.9010308@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: Sun, 19 Jan 2014 22:23:17 +0100 Lines: 91 Approved: news@gmane.org Message-ID: <52DC4245.9010308@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> <3a3d55c0-20cb-40ff-ae46-84663d21f44d@isocpp.org> <53d0e0c3-7eee-4853-886d-624bf4b22fb4@isocpp.org> <52DC3ED7.90707 07@knejp.de> Reply-To: std-proposals@isocpp.org NNTP-Posting-Host: plane.gmane.org Mime-Version: 1.0 Content-Type: multipart/alternative; boundary="------------050305000202030103060604" X-Trace: ger.gmane.org 1390166590 9430 80.91.229.3 (19 Jan 2014 21:23:10 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Sun, 19 Jan 2014 21:23:10 +0000 (UTC) To: std-proposals@isocpp.org Original-X-From: std-proposals+bncBC6ONSXJ54LBBQME6GLAKGQEWZNHNXQ@isocpp.org Sun Jan 19 22:23:16 2014 Return-path: Envelope-to: gclcip-std-proposals@m.gmane.org Original-Received: from mail-fa0-f70.google.com ([209.85.161.70]) by plane.gmane.org with esmtp (Exim 4.69) (envelope-from ) id 1W4zpq-0006gD-AO for gclcip-std-proposals@m.gmane.org; Sun, 19 Jan 2014 22:23:14 +0100 Original-Received: by mail-fa0-f70.google.com with SMTP id x10sf7352191fax.5 for ; Sun, 19 Jan 2014 13:23:13 -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=W7GwqNzOZZD1aly6pB1fMF+IP8KrGND0xsDLZET82wY=; b=FO6RNZjMruoIFCvfVjE0WU0pSTk/Bl5Zkorl7lRnnY8ugHR0j1Gqh/GybFNUP4xpM3 uWlm2tPG6Iwas17mdi1zzDFHw/iSfEJjq3BG8tK6fTzHIKzUiq3ql+akrnCqOr9lau2I m088585X2W62RAt57EkCoLkHcFoxfMJ9aKstHWf24eeWVHvsgGdGZoj2o2Iik66WJlMV 3X5YBfUY80WH/+N9XT+JQdK2vNY6beKBMBl2TQcCZ/qxnjCTmkCyp0OSwMmL60eQ+AgY /zUqoyVnwqGWPBmdc/C6d22qcKAmfoWl6Jksm+XvFyNBXK9SDdvgIUJyaVjtISeGBTWv Ll4g== X-Gm-Message-State: ALoCoQlqac/dxyD7b9ydkh+7JKi5HfVShusIN3eRCzqXykITO5/8rWXWwpJoP5aDs5jK+hPvldab X-Received: by 10.180.19.66 with SMTP id c2mr4962624wie.7.1390166593749; Sun, 19 Jan 2014 13:23:13 -0800 (PST) X-BeenThere: std-proposals@isocpp.org Original-Received: by 10.180.101.202 with SMTP id fi10ls385604wib.39.canary; Sun, 19 Jan 2014 13:23:13 -0800 (PST) X-Received: by 10.14.182.199 with SMTP id o47mr14180403eem.7.1390166593015; Sun, 19 Jan 2014 13:23:13 -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 v2si10762671eef.5.2014.01.19.13.23.12 for (version=TLSv1 cipher=RC4-SHA bits=128/128); Sun, 19 Jan 2014 13:23:12 -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 3f6prw48gYz4KK2Z for ; Sun, 19 Jan 2014 22:23:12 +0100 (CET) Original-Received: from www.knejp.de (ppp-188-174-14-30.dynamic.mnet-online.de [188.174.14.30]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by mail.mnet-online.de (Postfix) with SMTP id 3f6prw2q4pzbbgj for ; Sun, 19 Jan 2014 22:23:12 +0100 (CET) Original-Received: from [192.168.42.4] ([192.168.42.4]) by www.knejp.de ; Sun, 19 Jan 2014 22:23:07 +0100 User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:24.0) Gecko/20100101 Thunderbird/24.2.0 In-Reply-To: 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:8705 Archived-At: This is a multi-part message in MIME format. --------------050305000202030103060604 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Am 19.01.2014 22:15, schrieb Nevin Liber: > On 19 January 2014 15:08, Miro Knejp > wrote: > > > I don't see why there should be a difference between specialized > and unspecialized optional. I also don't see how it > is different from a "null string_view". As far as I can see the > semantics are equivalent. As long as string_view does not accept > nullptr the specialization is nothing but a sizeof() optimizing > implementation detail. > > > In which case it is just a Quality of Implementation issue and need > not be addressed by the Standard. Yes, that was basically my point. -- --- 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/. --------------050305000202030103060604 Content-Type: text/html; charset=ISO-8859-1
Am 19.01.2014 22:15, schrieb Nevin Liber:
On 19 January 2014 15:08, Miro Knejp <miro@knejp.de> wrote:

I don't see why there should be a difference between specialized and unspecialized optional<string_view>. I also don't see how it is different from a "null string_view". As far as I can see the semantics are equivalent. As long as string_view does not accept nullptr the specialization is nothing but a sizeof() optimizing implementation detail.

In which case it is just a Quality of Implementation issue and need not be addressed by the Standard.
Yes, that was basically my point.

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