220 8704 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: Sun, 19 Jan 2014 15:15:07 -0600 Lines: 71 Approved: news@gmane.org Message-ID: 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> <52DC3ED7.9070707@knejp.de> Reply-To: std-proposals@isocpp.org NNTP-Posting-Host: plane.gmane.org Mime-Version: 1.0 Content-Type: multipart/alternative; boundary=001a11c3841a698d5504f05947b7 X-Trace: ger.gmane.org 1390166143 3777 80.91.229.3 (19 Jan 2014 21:15:43 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Sun, 19 Jan 2014 21:15:43 +0000 (UTC) To: "std-proposals@isocpp.org" Original-X-From: std-proposals+bncBCE35H5S6IDBBBEB6GLAKGQEPWJUY7Y@isocpp.org Sun Jan 19 22:15:50 2014 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 1W4zif-0004TE-0c for gclcip-std-proposals@m.gmane.org; Sun, 19 Jan 2014 22:15:49 +0100 Original-Received: by mail-lb0-f200.google.com with SMTP id c11sf9699325lbj.11 for ; Sun, 19 Jan 2014 13:15:48 -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=H+UQqkEDQFALaRY7YFZ2t3IYInj9GIPMyoODcW1okJA=; b=ilp82nWNdhlDS+jK0huMm9PnNdHpwZ7qzxTCzPlxS/ZLVG7IqrswOpg43rA1F1sm1N jitSzqswuxHvi/GIgg+ut42n+G5f1hXBukQ2RreY9HW6gKH/1bebYMbVZcqV85L8y9Ys TIgxeWeEslWvKMM1fzkBjfYNzZp7MF0QjC+/zxidAbi+u1efdmGKbjt+PHGn6iwA3yau kVYsyDzA2/Z4N9fi1EM2lbaSe5tiTnREcccjcE+7nCYodKGHfFhbUCVyLfpk2d+jp2bI LQShUcB7ukxuwXqQRW39ajgbXS760Yr/PitDiiZFpjdto/b6Nl/GzvuMfmY3nH7InjOB +Qdg== X-Gm-Message-State: ALoCoQlq43l1AA6aZlKyr5bXG2sz5u2Rfk2p+Y615xLel3OgowYTTS/HZQ3XC45XOtILt9exiLMo X-Received: by 10.112.25.39 with SMTP id z7mr6762491lbf.4.1390166148677; Sun, 19 Jan 2014 13:15:48 -0800 (PST) X-BeenThere: std-proposals@isocpp.org Original-Received: by 10.180.76.116 with SMTP id j20ls369934wiw.10.gmail; Sun, 19 Jan 2014 13:15:48 -0800 (PST) X-Received: by 10.180.20.15 with SMTP id j15mr7334733wie.4.1390166148081; Sun, 19 Jan 2014 13:15:48 -0800 (PST) Original-Received: from mail-wg0-x22e.google.com (mail-wg0-x22e.google.com [2a00:1450:400c:c00::22e]) by mx.google.com with ESMTPS id op5si13422621wjc.80.2014.01.19.13.15.47 for (version=TLSv1 cipher=ECDHE-RSA-RC4-SHA bits=128/128); Sun, 19 Jan 2014 13:15:47 -0800 (PST) Received-SPF: pass (google.com: domain of nliber@gmail.com designates 2a00:1450:400c:c00::22e as permitted sender) client-ip=2a00:1450:400c:c00::22e; Original-Received: by mail-wg0-f46.google.com with SMTP id x12so6136698wgg.1 for ; Sun, 19 Jan 2014 13:15:47 -0800 (PST) X-Received: by 10.180.188.197 with SMTP id gc5mr7106195wic.30.1390166147695; Sun, 19 Jan 2014 13:15:47 -0800 (PST) Original-Sender: nliber@gmail.com Original-Received: by 10.194.121.163 with HTTP; Sun, 19 Jan 2014 13:15:07 -0800 (PST) In-Reply-To: <52DC3ED7.9070707@knejp.de> 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:c00::22e 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:8704 Archived-At: --001a11c3841a698d5504f05947b7 Content-Type: text/plain; charset=ISO-8859-1 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. -- 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/. --001a11c3841a698d5504f05947b7 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable
On 19 January 2014 15:08, Miro Knejp <= ;miro@knejp.de> wrote:
=20 =20 =20

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

In w= hich case it is just a Quality of Implementation issue and need not be addr= essed by the Standard.
--
=A0Nevin ":-)" Liber=A0 <ma= ilto:nevin@evil= overlord.com>=A0 (847) 691-1404

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