220 8922 article Path: news.gmane.org!not-for-mail From: Nevin Liber Newsgroups: gmane.comp.lang.c++.isocpp.proposals Subject: Re: Re: String to T conversions - getting it right this time Date: Wed, 29 Jan 2014 10:23:59 -0600 Lines: 68 Approved: news@gmane.org Message-ID: References: <097fb6c8-56f9-433e-a2f0-8c0f69609bf0@isocpp.org> <34c26aca-59cf-4254-9ab1-31a403d4a3db@isocpp.org> Reply-To: std-proposals@isocpp.org NNTP-Posting-Host: plane.gmane.org Mime-Version: 1.0 Content-Type: multipart/alternative; boundary=001a11c288a2a1ab9a04f11e6067 X-Trace: ger.gmane.org 1391012675 5987 80.91.229.3 (29 Jan 2014 16:24:35 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Wed, 29 Jan 2014 16:24:35 +0000 (UTC) To: "std-proposals@isocpp.org" Original-X-From: std-proposals+bncBCE35H5S6IDBBSGWUSLQKGQEOUJK2AI@isocpp.org Wed Jan 29 17:24:42 2014 Return-path: Envelope-to: gclcip-std-proposals@m.gmane.org Original-Received: from mail-bk0-f72.google.com ([209.85.214.72]) by plane.gmane.org with esmtp (Exim 4.69) (envelope-from ) id 1W8XwP-0001vM-Nl for gclcip-std-proposals@m.gmane.org; Wed, 29 Jan 2014 17:24:41 +0100 Original-Received: by mail-bk0-f72.google.com with SMTP id mx11sf4921484bkb.3 for ; Wed, 29 Jan 2014 08:24:41 -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=fmhz9xGsbXH2cJ4fZmcFDc5pMh+bBDQJIQgFW+ykFi4=; b=AZVFKv7+HcxaUdMjM4AVMCJiFSP3G9wjWv95YyHpho1fUAlFyLpSzKzQu9cpnncAmR +jr7vegi0Lh0bOUXlP0OFlJqlqC9EFky8C0E3EcowRyPHiZdXVESb2Yibs7DU2/m83zk XdM++y3czZhDQxXbjAiQbWBOrlnfo9xtakOTvKQGoYOwLKjpycgP/PvNQOitX5Iea4ZT iYgDwM206ElW5Fx0OroWSrFRdcLWYI1oQF5FlWeeKfpVMuylWoG8VtkfGaQZuZyFNf/f U7nXBHoLg1jkdoXcS6KqBR5VridDa06gVqASiMDeB0UOBL5CNRJlYu0cRtIzAlKxqLYl gNCw== X-Gm-Message-State: ALoCoQlqGpoe519pbBN8enSmg6vhu29HsLrm06dH3DrFhKKiMfkvhNrD47g+/gNHkTDe+BXgbLxq X-Received: by 10.180.80.70 with SMTP id p6mr5016551wix.4.1391012681364; Wed, 29 Jan 2014 08:24:41 -0800 (PST) X-BeenThere: std-proposals@isocpp.org Original-Received: by 10.180.14.194 with SMTP id r2ls110050wic.1.gmail; Wed, 29 Jan 2014 08:24:39 -0800 (PST) X-Received: by 10.180.98.42 with SMTP id ef10mr20027525wib.49.1391012679837; Wed, 29 Jan 2014 08:24:39 -0800 (PST) Original-Received: from mail-wg0-x232.google.com (mail-wg0-x232.google.com [2a00:1450:400c:c00::232]) by mx.google.com with ESMTPS id wk5si1463375wjc.57.2014.01.29.08.24.39 for (version=TLSv1 cipher=ECDHE-RSA-RC4-SHA bits=128/128); Wed, 29 Jan 2014 08:24:39 -0800 (PST) Received-SPF: pass (google.com: domain of nliber@gmail.com designates 2a00:1450:400c:c00::232 as permitted sender) client-ip=2a00:1450:400c:c00::232; Original-Received: by mail-wg0-f50.google.com with SMTP id l18so4047714wgh.5 for ; Wed, 29 Jan 2014 08:24:39 -0800 (PST) X-Received: by 10.194.219.132 with SMTP id po4mr5659105wjc.7.1391012679361; Wed, 29 Jan 2014 08:24:39 -0800 (PST) Original-Sender: nliber@gmail.com Original-Received: by 10.194.121.163 with HTTP; Wed, 29 Jan 2014 08:23:59 -0800 (PST) In-Reply-To: <34c26aca-59cf-4254-9ab1-31a403d4a3db@isocpp.org> 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:c00::232 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:8922 Archived-At: --001a11c288a2a1ab9a04f11e6067 Content-Type: text/plain; charset=ISO-8859-1 On 29 January 2014 10:18, Bengt Gustafsson wrote: > Regarding default values produced when the conversion fails this is > another argument for this style: > > from_string(T& dest, string_view& src) > > Now the standard can specify that the function shall not touch dest if > conversion fails. > How exactly do you guarantee that if an exception is thrown while dest is being mutated? -- 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/. --001a11c288a2a1ab9a04f11e6067 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable
On 29 January 2014 10:18, Bengt Gustafsson <b= engt.gustafsson@beamways.com> wrote:
Regarding default values pr= oduced when the conversion fails this is another argument for this style:
<error return type> from_string(T& dest, string_vi= ew& src)

Now the standard can specify that the= function shall not touch dest if conversion fails.

How exactly do you guarantee that if an exception is th= rown while dest is being mutated?
--=A0
=A0Nevin &= quot;:-)" Liber=A0 <mailto:nevin@eviloverlord.com>=A0 (847) 691-1404

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