220 8616 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: Wed, 15 Jan 2014 13:52:17 -0600 Lines: 69 Approved: news@gmane.org Message-ID: References: <8045a4d2-721d-4725-8bb7-7a91b6f53ec8@isocpp.org> <2875722.TjfBuHt6Pp@tjmaciei-mobl2> <2685690.E3vksNc10o@tjmaciei-mobl2> Reply-To: std-proposals@isocpp.org NNTP-Posting-Host: plane.gmane.org Mime-Version: 1.0 Content-Type: multipart/alternative; boundary=001a1134d2dacd940c04f007a7f4 X-Trace: ger.gmane.org 1389815573 7571 80.91.229.3 (15 Jan 2014 19:52:53 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Wed, 15 Jan 2014 19:52:53 +0000 (UTC) To: "std-proposals@isocpp.org" Original-X-From: std-proposals+bncBCE35H5S6IDBBGWO3OLAKGQE3AXKK5A@isocpp.org Wed Jan 15 20:53:01 2014 Return-path: Envelope-to: gclcip-std-proposals@m.gmane.org Original-Received: from mail-ee0-f70.google.com ([74.125.83.70]) by plane.gmane.org with esmtp (Exim 4.69) (envelope-from ) id 1W3WWJ-0006RB-Ur for gclcip-std-proposals@m.gmane.org; Wed, 15 Jan 2014 20:53:00 +0100 Original-Received: by mail-ee0-f70.google.com with SMTP id d17sf3727066eek.1 for ; Wed, 15 Jan 2014 11:52:58 -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=0UGkQI0AkSiI/q3ffLlJTrs/Il7s2MiK+5jNPOgKBwg=; b=Tsn89joZ+3vksgjXx7qkuHohDNx7Uru5mu2XAguWX+6cbefGHze5stjqPd2+eMzUGQ xkX2+ssX8w3mqzczXSEIGOK7J1qWD6orSiUz1/ikGV9+MwlUo5TWEqk0k5LF1Ljk6bD2 GP2/vARKy0p8AKE6BpyNBBSqOWI3c0eH7zdFmetCMNHrGxbuNXJqq/2gsCy6lbpMSyPV 2r9gfZt1gksvDFls9zX8xc6TCqd1nm1B23Mk8wGpYkXtMWogmMsBR7s7gnBBTM9QFOba sgjzSJH9kW3RG0F18Ejlk0X63ztMLzjLln30+j+dKlCvhURmLuiTVIe6RsGsgMP9F/uQ 2jwQ== X-Gm-Message-State: ALoCoQn+yTX+QdYrOwb+dPy/HTwmQB/1y+8TQLa+wXXZsoSF0Curl/GGPQaF4A+rFzC5xb2ctcbk X-Received: by 10.152.245.169 with SMTP id xp9mr1937381lac.2.1389815578916; Wed, 15 Jan 2014 11:52:58 -0800 (PST) X-BeenThere: std-proposals@isocpp.org Original-Received: by 10.180.21.148 with SMTP id v20ls590610wie.34.canary; Wed, 15 Jan 2014 11:52:58 -0800 (PST) X-Received: by 10.194.82.105 with SMTP id h9mr4289561wjy.52.1389815577995; Wed, 15 Jan 2014 11:52:57 -0800 (PST) Original-Received: from mail-we0-x22a.google.com (mail-we0-x22a.google.com [2a00:1450:400c:c03::22a]) by mx.google.com with ESMTPS id dj2si3948090wjc.7.2014.01.15.11.52.57 for (version=TLSv1 cipher=ECDHE-RSA-RC4-SHA bits=128/128); Wed, 15 Jan 2014 11:52:57 -0800 (PST) Received-SPF: pass (google.com: domain of nliber@gmail.com designates 2a00:1450:400c:c03::22a as permitted sender) client-ip=2a00:1450:400c:c03::22a; Original-Received: by mail-we0-f170.google.com with SMTP id u57so2290357wes.29 for ; Wed, 15 Jan 2014 11:52:57 -0800 (PST) X-Received: by 10.180.221.38 with SMTP id qb6mr4133732wic.26.1389815577545; Wed, 15 Jan 2014 11:52:57 -0800 (PST) Original-Sender: nliber@gmail.com Original-Received: by 10.194.121.163 with HTTP; Wed, 15 Jan 2014 11:52:17 -0800 (PST) In-Reply-To: <2685690.E3vksNc10o@tjmaciei-mobl2> 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::22a 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:8616 Archived-At: --001a1134d2dacd940c04f007a7f4 Content-Type: text/plain; charset=ISO-8859-1 On 15 January 2014 13:45, Thiago Macieira wrote: > > The null option comes in handy when you need to distinguish a field that > might > be present but empty from a field that isn't present. QUrl makes use of > that > and the equivalent std::networking::uri proposal just uses > std::optional (String is a template). That looks like a better solution to me. null and empty are different conceptually and should not be merged together. -- 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/. --001a1134d2dacd940c04f007a7f4 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable
On 15 January 2014 13:45, Thiago Macieira <thiago@macie= ira.org> wrote:

The null option comes in handy when you need to distinguish a field that mi= ght
be present but empty from a field that isn't present. QUrl makes use of= that
and the equivalent std::networking::uri proposal just uses
std::optional<String> (String is a template).

That looks like a better solution to me.=A0 null and empty are dif= ferent conceptually and should not be merged together.
-- =A0Nevin ":-)" Liber=A0 <mailto:nevin@eviloverlord.com>=A0 (847) 69= 1-1404

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