220 8713 <942afc35-d655-4a32-a482-1c7cbf299d1c@isocpp.org> article Path: news.gmane.org!not-for-mail From: gornishanov@gmail.com Newsgroups: gmane.comp.lang.c++.isocpp.proposals Subject: Re: string_view::is_null() Date: Sun, 19 Jan 2014 14:55:24 -0800 (PST) Lines: 75 Approved: news@gmane.org Message-ID: <942afc35-d655-4a32-a482-1c7cbf299d1c@isocpp.org> 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="----=_Part_837_23178409.1390172124703" X-Trace: ger.gmane.org 1390172120 32614 80.91.229.3 (19 Jan 2014 22:55:20 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Sun, 19 Jan 2014 22:55:20 +0000 (UTC) To: std-proposals@isocpp.org Original-X-From: std-proposals+bncBC47RF4IW4GRBXVP6GLAKGQEX4RTWKQ@isocpp.org Sun Jan 19 23:55:28 2014 Return-path: Envelope-to: gclcip-std-proposals@m.gmane.org Original-Received: from mail-ie0-f198.google.com ([209.85.223.198]) by plane.gmane.org with esmtp (Exim 4.69) (envelope-from ) id 1W51H5-00029Z-GE for gclcip-std-proposals@m.gmane.org; Sun, 19 Jan 2014 23:55:27 +0100 Original-Received: by mail-ie0-f198.google.com with SMTP id ar20sf11971118iec.9 for ; Sun, 19 Jan 2014 14:55:26 -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=5oNJOxBnpgkGRntLBm3KDnhPkIi8PGX+oVAISr6BFbA=; b=iPVSLakJ1MleXEEjBmueiqbEfa0fPp0xgspMBdk3Uy14UC03SY7T2mue9ZqGUt5J1m rTIA2gQs/sU4F4inZBu5d7CP9mdLQyEDVrbqSTSogsK1Hh7u8Y5vdcFyWIo1fB3u1FVU TW12Q7zgDcNYLAXVHFRk6SbO1iw8QGhg0nhGw1YgUlVnYMdVP0mmSGuJDuHwuVXVS4Zi FjG99P4ybjyWrJ8Ol2Jx+qvsFjWAAtYlphpmOgk+shVNwHUH/C9R1Yqkf+8Nx+Lm/LQg dsfMotWho4rFL9BwOnRA30PsnzBFT9eiP2C/muAM83ZklGnE/l+2CmZ21vea+Jmg4u+k tqqQ== 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=5oNJOxBnpgkGRntLBm3KDnhPkIi8PGX+oVAISr6BFbA=; b=m1OFNm9l670POlIb+uYzrTy/t/fnkbeDYgHc8Uxz4bbhsCfMkhElLzk/ggtxY4O/vV erwyddwtHkOGq3bC8UBNJDpKhuCJaI7srygMMNlVEwAD2UMOKmyZdTIMrEqFEMtBkzrR Oyc++a926Y42sFGzeSFKY2ev4g4pBw8mCAIuKkYPCuSi1V87XIsTEtvFBPrGX4tmHN4P YRe2iQPvmMDik8BwHV7568VCWQJy4R39Q4deiTPer86AagZ88k72RDaWU+j0julxH6D5 6WtcN2FtfzAIhwVsW2VsCfzuYOv/+KZeLgk4VHgDUwiG5IK4kqRiZZ8VW771xZ0vbSwV kZnA== X-Gm-Message-State: ALoCoQmqOekJ0y9cRDOibahkoI4tsns0rVu79STuw2a1e90W0Z0nQyYg5y0onP/J9OEcdaqKNSva X-Received: by 10.50.33.47 with SMTP id o15mr5697680igi.0.1390172126617; Sun, 19 Jan 2014 14:55:26 -0800 (PST) X-BeenThere: std-proposals@isocpp.org Original-Received: by 10.51.15.229 with SMTP id fr5ls1357483igd.13.canary; Sun, 19 Jan 2014 14:55:26 -0800 (PST) X-Received: by 10.50.152.41 with SMTP id uv9mr183684igb.13.1390172126128; Sun, 19 Jan 2014 14:55:26 -0800 (PST) In-Reply-To: X-Original-Sender: gornishanov@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:8713 Archived-At: ------=_Part_837_23178409.1390172124703 Content-Type: text/plain; charset=UTF-8 Alexander: The current proposal requires data != null. Ok. But IMHO there is no reason for this. It just > restricts the cases where a string_view would be useful. > I see, would replacing constexpr basic_string_view(const charT* str, size_type len); *Requires*: str is not a null pointer and [str,str + len) is a valid range. with constexpr basic_string_view(const charT* str, size_type len); *Requires*: str is not a null pointer and [str,str + len) is a valid range or str == nullptr and len == 0. address your concerns? -- --- 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/. ------=_Part_837_23178409.1390172124703 Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: quoted-printable
Alexander:

The current propo= sal requires data !=3D null. Ok. But IMHO there is no reason for this. It j= ust
restricts the cases= where a string_view would be useful.
<= div>
I see, would replacing

constexpr basic_string_view(const charT* str, size_type len);
Requires: str is not a null pointer a=
nd [str,str + len) is a valid range.
with
constexpr basic_string_view(const charT* str, size_type len);
Requires: str is not a null pointer =
and [str,str + len) is a valid range
or str =3D=3D nullptr and len =3D=
=3D 0.
address your concerns?


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