220 8600 <7aad44d8-6b4e-438a-b309-bd898b994b34@isocpp.org> article Path: news.gmane.org!not-for-mail From: Olaf van der Spek Newsgroups: gmane.comp.lang.c++.isocpp.proposals Subject: Re: string_view::is_null() Date: Wed, 15 Jan 2014 04:28:39 -0800 (PST) Lines: 58 Approved: news@gmane.org Message-ID: <7aad44d8-6b4e-438a-b309-bd898b994b34@isocpp.org> References: <8045a4d2-721d-4725-8bb7-7a91b6f53ec8@isocpp.org> <186E0927-C962-4E34-AED0-E7509DD1F0A0@gmail.com> Reply-To: std-proposals@isocpp.org NNTP-Posting-Host: plane.gmane.org Mime-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_Part_932_25236934.1389788919462" X-Trace: ger.gmane.org 1389788917 21451 80.91.229.3 (15 Jan 2014 12:28:37 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Wed, 15 Jan 2014 12:28:37 +0000 (UTC) To: std-proposals@isocpp.org Original-X-From: std-proposals+bncBC5NB45SSABBB6H53GLAKGQE2APRACY@isocpp.org Wed Jan 15 13:28:42 2014 Return-path: Envelope-to: gclcip-std-proposals@m.gmane.org Original-Received: from mail-vb0-f72.google.com ([209.85.212.72]) by plane.gmane.org with esmtp (Exim 4.69) (envelope-from ) id 1W3PaL-0001IL-LJ for gclcip-std-proposals@m.gmane.org; Wed, 15 Jan 2014 13:28:41 +0100 Original-Received: by mail-vb0-f72.google.com with SMTP id x8sf1526915vbf.7 for ; Wed, 15 Jan 2014 04:28:40 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=date:from:to:message-id:in-reply-to:references:subject:mime-version :x-original-sender:reply-to:precedence:mailing-list:list-id :list-post:list-help:list-archive:list-subscribe:list-unsubscribe :content-type; bh=zYsCjXOzArUpP1YQPmeWBKRsIqnNRn+1zqQPi2AL3Lc=; b=Io2SM3aH5DGo6wLQLuaRa7dOg2Vdwgd7Lq92dNjMZC/TKAEE2B1xfRf+0HQeST1vhP fz7YWDh+HonBMiZrOhHfCIoPQyU17Y2JfHMh+RJ5oNH5YwroWq+dgLEzvKJhxVxE9s9w RhgKfn07lvfydp5rHj+scjTRYOXCl/tx6wgexlzACirFV9E4qsICKyLpaiI6tsZrbaYR ohz7lQZ3JCDf5kfL2DW/vZu44yEZJWVspKoEcfKqSYI8GKx1/CkzjJKs8rVm8JRHwkal Y5/bfsgHs5ZkvwJOnQ761l68i01XomcDPSbUps7y+RbwR6ylRMAscJNSjNeiMJLLrzZS Ro/Q== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:date:from:to:message-id:in-reply-to:references :subject:mime-version:x-original-sender:reply-to:precedence :mailing-list:list-id:list-post:list-help:list-archive :list-subscribe:list-unsubscribe:content-type; bh=zYsCjXOzArUpP1YQPmeWBKRsIqnNRn+1zqQPi2AL3Lc=; b=Q+VzFAadfBHR/p1MXo423xk3h0BsReAlyxFQWQt7pbpFdokw6RLdQYyoIPC0LkNZEO EAHbuvwWNV5XL//qHwmcqWHXZSc2cGoKtKljf3QfyFkZ0lWVhz3HuMMD+QoyhdR8M0BM qdnCGdcvu18Xtis+gtPagYjbyGhL6MaojyZ8Am5vWm+XarVsWqXcLK5919AdX9N5anXy hLYJtnZwIBAJd7xcZWi4/Mj9lPmi+J4zvi4qd+rTNeeNz5UzJr8TPqH0ENG77ME6qJ0H ny72j3fAuNCQZaAk8F1UEy/5jj4T4ws9zItq1++PBDtPmhSN0gVVavYLBbJtrDtmW1WR jhrA== X-Gm-Message-State: ALoCoQmojYT8ojgsqsxCvdNRc1pcHyv3SXxQ0pkkjzBah8547PgPyq0HDRir8zYU6G8STQ/rAdqS X-Received: by 10.58.189.73 with SMTP id gg9mr841536vec.34.1389788920687; Wed, 15 Jan 2014 04:28:40 -0800 (PST) X-BeenThere: std-proposals@isocpp.org Original-Received: by 10.49.75.105 with SMTP id b9ls461499qew.33.gmail; Wed, 15 Jan 2014 04:28:40 -0800 (PST) X-Received: by 10.49.122.42 with SMTP id lp10mr33381qeb.17.1389788920198; Wed, 15 Jan 2014 04:28:40 -0800 (PST) In-Reply-To: <186E0927-C962-4E34-AED0-E7509DD1F0A0@gmail.com> X-Original-Sender: olafvdspek@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:8600 Archived-At: ------=_Part_932_25236934.1389788919462 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable On Saturday, December 28, 2013 6:01:34 AM UTC+1, Marshall wrote: > > if sv.size () =3D=3D 0 or sv.empty () [same thing], there is nothing that= you=20 > can do with sv.data() > (except compare it to null, and that doesn=E2=80=99t tell you anything us= eful). > Are you sure? IMO an empty string_view could still point into a string and I should be=20 able to use that pointer to for example construct a new string_view. --=20 ---=20 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 e= mail 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-proposa= ls/. ------=_Part_932_25236934.1389788919462 Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: quoted-printable
On Saturday, December 28, 2013 6:01:34 AM UTC+1, Marshall = wrote:
if sv.size () =3D=3D 0 or sv.empty () [same thing], there = is nothing that you can do with sv.data()
(except compare it to n= ull, and that doesn=E2=80=99t tell you anything useful).

Are you sure?
IMO an empty string_view = could still point into a string and I should be able to use that pointer to= for example construct a new string_view.

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