220 8634 article Path: news.gmane.org!not-for-mail From: "Billy O'Neal" Newsgroups: gmane.comp.lang.c++.isocpp.proposals Subject: Re: string_view::is_null() Date: Thu, 16 Jan 2014 15:10:12 -0800 Lines: 118 Approved: news@gmane.org Message-ID: References: <52d6c23b.6f8a440a.74c7.1675@mx.google.com> <1abccd12-9b4f-49ab-8cfd-bad8878f09af@isocpp.org> Reply-To: std-proposals@isocpp.org NNTP-Posting-Host: plane.gmane.org Mime-Version: 1.0 Content-Type: multipart/alternative; boundary=001a11c204f289c7e704f01e89da X-Trace: ger.gmane.org 1389913847 32027 80.91.229.3 (16 Jan 2014 23:10:47 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Thu, 16 Jan 2014 23:10:47 +0000 (UTC) To: std-proposals Original-X-From: std-proposals+bncBDKLBLVE6ADBB7WN4GLAKGQEQLM4KZI@isocpp.org Fri Jan 17 00:10:56 2014 Return-path: Envelope-to: gclcip-std-proposals@m.gmane.org Original-Received: from mail-qa0-f70.google.com ([209.85.216.70]) by plane.gmane.org with esmtp (Exim 4.69) (envelope-from ) id 1W3w5P-0004qx-Vi for gclcip-std-proposals@m.gmane.org; Fri, 17 Jan 2014 00:10:56 +0100 Original-Received: by mail-qa0-f70.google.com with SMTP id ii20sf4810884qab.9 for ; Thu, 16 Jan 2014 15:10:55 -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: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=c86IRt9u5ZR/5pVkwrtvDfyfL+gorRX+VNuWMOYNL9g=; b=LDP0dTkcBGyJS/bt3HqfT43NpjmhyRIXvU17jqBlI5chDghz4733d5CmAI5IOCoiJU pEMyFhrHnFitvb8saumwfOduoU1cLXijW4zQStZ1pKZIhOSXyYnPf9QY6B64/PhKmozv Dktpgx5khkNy47Mf5pV61HmCFtrCtALg1+0+Tr+q7uJ9TZ6HS9J8J6gb+dLFuQ2PjbJN gu4M+mo+KS4hU0M2hgFEdJYsnsxl1mtc+MxnwvJ1DWdlVrXG7vxveyPaYe1BnWjKRP+1 W9tktj/HZS+7Gr6G94UUBtFDc+5rFi/4mOgKNK/JMo49uud4TPNCUjuDYjnFOypfrtL+ Khyg== X-Gm-Message-State: ALoCoQm26xZX2NgK9N9yU54ot9TfIcDVQoibJWNlQRMmeKmLdbu/1rgPBaLdaTkaRqf2jQyn+sWX X-Received: by 10.236.149.198 with SMTP id x46mr4164686yhj.7.1389913855176; Thu, 16 Jan 2014 15:10:55 -0800 (PST) X-BeenThere: std-proposals@isocpp.org Original-Received: by 10.140.88.227 with SMTP id t90ls363855qgd.52.gmail; Thu, 16 Jan 2014 15:10:54 -0800 (PST) X-Received: by 10.236.77.231 with SMTP id d67mr5689459yhe.113.1389913854602; Thu, 16 Jan 2014 15:10:54 -0800 (PST) Original-Received: from mail-ob0-x236.google.com (mail-ob0-x236.google.com [2607:f8b0:4003:c01::236]) by mx.google.com with ESMTPS id q66si12227215yhm.104.2014.01.16.15.10.54 for (version=TLSv1 cipher=ECDHE-RSA-RC4-SHA bits=128/128); Thu, 16 Jan 2014 15:10:54 -0800 (PST) Received-SPF: pass (google.com: domain of billy.oneal@gmail.com designates 2607:f8b0:4003:c01::236 as permitted sender) client-ip=2607:f8b0:4003:c01::236; Original-Received: by mail-ob0-f182.google.com with SMTP id wn1so3535828obc.41 for ; Thu, 16 Jan 2014 15:10:54 -0800 (PST) X-Received: by 10.182.243.161 with SMTP id wz1mr9472034obc.10.1389913854034; Thu, 16 Jan 2014 15:10:54 -0800 (PST) Original-Received: by 10.182.87.37 with HTTP; Thu, 16 Jan 2014 15:10:12 -0800 (PST) In-Reply-To: <1abccd12-9b4f-49ab-8cfd-bad8878f09af@isocpp.org> X-Original-Sender: billy.oneal@gmail.com X-Original-Authentication-Results: mx.google.com; spf=pass (google.com: domain of billy.oneal@gmail.com designates 2607:f8b0:4003:c01::236 as permitted sender) smtp.mail=billy.oneal@gmail.com; dkim=pass header.i=@gmail.com; dmarc=pass (p=NONE dis=NONE) header.from=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:8634 Archived-At: --001a11c204f289c7e704f01e89da Content-Type: text/plain; charset=UTF-8 What do you expect to_string(foo); to return if foo is a null string_view? Billy O'Neal https://github.com/BillyONeal/ http://stackoverflow.com/users/82320/billy-oneal On Thu, Jan 16, 2014 at 2:46 PM, Casey Carter wrote: > On Wednesday, January 15, 2014 11:15:36 AM UTC-6, Billy O'Neal wrote: >> >> It should be discouraged because we don't want to have to write null >> checks in every function under the sun; it is about preventing callers from >> supplying unexpected results. >> > > "Every function under the sun" must already be able to deal with an empty > string_view, given that a null string_view must also necessarily be empty, > there's no need to check for null as a special case. > > -- > > --- > 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/. > -- --- 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/. --001a11c204f289c7e704f01e89da Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: quoted-printable
What do you expect

to_string= (foo);

to return if foo is a null string_view?



On Thu, Jan 16, 2014 at 2:46 PM, Casey C= arter <cartec69@gmail.com> wrote:
On Wednesday, January 15, 2014 11:15:36 AM UTC-6, Billy O&= #39;Neal wrote:
It should= be discouraged because we don't want to have to write null checks in e= very function under the sun; it is about preventing callers from supplying = unexpected results.

"Every function under the sun&q= uot; must already be able to deal with an empty string_view, given that a n= ull string_view must also necessarily be empty, there's no need to chec= k for null as a special case.

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