220 32675 <525dfba6-3329-4c8f-94eb-9f90b39e9a49@isocpp.org> article Path: news.gmane.org!.POSTED!not-for-mail From: Arthur O'Dwyer Newsgroups: gmane.comp.lang.c++.isocpp.proposals Subject: Re: std::string::find implementation Date: Tue, 30 May 2017 16:29:52 -0700 (PDT) Lines: 83 Approved: news@gmane.org Message-ID: <525dfba6-3329-4c8f-94eb-9f90b39e9a49@isocpp.org> References: <82be917c-b3c8-4cb4-bbbc-0f62ec78ce84@isocpp.org> Reply-To: std-proposals@isocpp.org NNTP-Posting-Host: blaine.gmane.org Mime-Version: 1.0 Content-Type: multipart/mixed; boundary="----=_Part_3946_21777472.1496186992283" X-Trace: blaine.gmane.org 1496187005 29518 195.159.176.226 (30 May 2017 23:30:05 GMT) X-Complaints-To: usenet@blaine.gmane.org NNTP-Posting-Date: Tue, 30 May 2017 23:30:05 +0000 (UTC) To: ISO C++ Standard - Future Proposals Original-X-From: std-proposals+bncBDLZJYWNDQIPBAFYZECRUBD4ASODK@isocpp.org Wed May 31 01:29:49 2017 Return-path: Envelope-to: gclcip-std-proposals@m.gmane.org Original-Received: from mail-io0-f197.google.com ([209.85.223.197]) by blaine.gmane.org with esmtp (Exim 4.84_2) (envelope-from ) id 1dFqaC-00071p-It for gclcip-std-proposals@m.gmane.org; Wed, 31 May 2017 01:29:48 +0200 Original-Received: by mail-io0-f197.google.com with SMTP id d6sf2644160ioe.13 for ; Tue, 30 May 2017 16:29:54 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=isocpp-org.20150623.gappssmtp.com; s=20150623; h=date:from:to:message-id:in-reply-to:references:subject:mime-version :x-original-sender:reply-to:precedence:mailing-list:list-id :x-spam-checked-in-group:list-post:list-help:list-archive :list-subscribe:list-unsubscribe; bh=Aly5RAVkYTqB4tTOZyTzqnRLka60HEUE44x3hmtCtps=; b=FE4JvY5bJix6rJ3htrOFP/5nKCZnpqHgToVb5ztU/8GcyVABpOsUtI1YtGVWA6lXez X2jvP5O8m6RdjCOpuxhdy8D3fzy3ygtiDdoHaMzC9E+LgyGNwfSJLuSmbLtTiFOOZp1+ ENepxBOTxQObxzTI7GoZt5IHcEIDUcoHhWSxzuFMoVUzc1NYLPaoxVypmdVdkxHlJ1iJ tLwMzMDzKDM4UgBbjxgofDj6aQBq6ZBy+76TC64RY+6j7G37BFaNTDadpQf40XHHbHN6 GI8gIywcccyoHcbiaU3yc3lQZa8Qfb9U0KrLAVEeDx6+bMkuW4fm9xQ4QHxUVemT4tVK WSsQ== DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=date:from:to:message-id:in-reply-to:references:subject:mime-version :x-original-sender:reply-to:precedence:mailing-list:list-id :x-spam-checked-in-group:list-post:list-help:list-archive :list-subscribe:list-unsubscribe; bh=Aly5RAVkYTqB4tTOZyTzqnRLka60HEUE44x3hmtCtps=; b=ggKrFEP7z2GWW9oPj0SlbJAaGVvcmHzoDCT1bL1QoCOX5F8eMmJgvV6FKVO+goIUw3 +1AIVFQQ9i9+NeQ72dAXjTMtKMu7bAbWyEH6mkCNFVEOzZd3/KsDnzYVTsyc/rt9hFwq 1dUW0ildJ4UwV2DJQxhWbdkqiqGhuCcxcJoH5LepxbUDmbCPhxQPr1jQCSdyfVrkGmFA Wb7/Ym+A0SLIdTo2h9nM0yTcVlRRnpcQod5lk4QUXGb75E8CviE2VQohEP3+8IPrGpYz HGc1TjlUgMVn4DtOoYOP0r1n+CkNsPB500XGeCE3/5YJb+09k0wDV6WM8yfJzjbL4ezA qQeg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; 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:x-spam-checked-in-group:list-post:list-help :list-archive:list-subscribe:list-unsubscribe; bh=Aly5RAVkYTqB4tTOZyTzqnRLka60HEUE44x3hmtCtps=; b=V3MGfLNs2KvlaTnYekWcxHqJW/sQWH/vlfMwfmQO1dDYbdaQDBDLtdvuSDZOPWGkQU eB9Nxg4gq+Utg7b6bmh9TkAaRkEWW25WzcL2EzdcRwf/qkJF8oXe6vojncBqzs0SaqQ5 QWfMEx9VXlo4qLdXFkeddO6kj9K4HxIv45TH/BJnDNiclMSzUBz/pxvfOFhhOSw9uMzF TiGHG+hLBieWBWBQH/Y21vsERgzwezpo1M02dScWdqc7/Dk0WT35zTA+dC7NJjjjlIc4 W4VA1B5tUwGCAS+vym2rBQboP8lYMs1xXn0xflfzaGtQuvCLwafPeujm2zWrqjJvx1aK VsXA== X-Gm-Message-State: AODbwcBtj9QLFCO1U0uemqGGg1/LJgv75plXV1Kj2t4ksRtUtkW0vmSN RAKXkSijAIsN+Ph4 X-Received: by 10.107.47.159 with SMTP id v31mr4208391iov.45.1496186993659; Tue, 30 May 2017 16:29:53 -0700 (PDT) X-BeenThere: std-proposals@isocpp.org Original-Received: by 10.157.11.36 with SMTP id a33ls1854899ota.35.gmail; Tue, 30 May 2017 16:29:52 -0700 (PDT) X-Received: by 10.157.35.104 with SMTP id k37mr498280otd.14.1496186992792; Tue, 30 May 2017 16:29:52 -0700 (PDT) In-Reply-To: X-Original-Sender: arthur.j.odwyer@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:32675 Archived-At: ------=_Part_3946_21777472.1496186992283 Content-Type: multipart/alternative; boundary="----=_Part_3947_1417624030.1496186992284" ------=_Part_3947_1417624030.1496186992284 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Tuesday, May 30, 2017 at 6:38:03 AM UTC-7, Jonathan M=C3=BCller wrote: > > Now with `string_view` this could easily be achieved by taking a=20 > substring view and searching there. Problem is `std::string::substr()`=20 > doesn't actually return a view which makes it kind of awkward (have to=20 > create a view to the whole string, then substr).=20 > That is, the OP's use-case is simply this: std::string mystring; // proposed extension: auto p1 =3D mystring.find('A', 10, 15); // actual C++17: auto p1 =3D std::string_view(mystring).substr(10, 5).find('A'); Looks to me like we don't need any more surface area to get what he wants. =E2=80=93Arthur --=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. To view this discussion on the web visit https://groups.google.com/a/isocpp= ..org/d/msgid/std-proposals/525dfba6-3329-4c8f-94eb-9f90b39e9a49%40isocpp.or= g. ------=_Part_3947_1417624030.1496186992284 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
On Tuesday, May 30, 2017 at 6:38:03 AM UTC-7, Jonathan M= =C3=BCller wrote:
Now with `str= ing_view` this could easily be achieved by taking a=20
substring view and searching there. Problem is `std::string::substr()`= =20
doesn't actually return a view which makes it kind of awkward (have= to=20
create a view to the whole string, then substr).

That is, the OP's use-case is simp= ly this:

=C2=A0 =C2=A0 std::string mystring;
=

=C2=A0 =C2=A0 // proposed extension:
=C2=A0 = =C2=A0 auto p1 =3D mystring.find('A', 10, 15);

=C2=A0 =C2=A0 // actual C++17:
=C2=A0 =C2=A0 auto p1 =3D= std::string_view(mystring).substr(10, 5).find('A');
=

Looks to me like we don't need any more surfa= ce area to get what he wants.

=E2=80=93Arthur

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