220 3585 article Path: news.gmane.org!not-for-mail From: Ville Voutilainen Newsgroups: gmane.comp.lang.c++.isocpp.proposals Subject: Re: "break break ;" etc. to break out of nested loops Date: Sat, 6 Apr 2013 14:39:42 +0300 Lines: 105 Approved: news@gmane.org Message-ID: References: <1f964e4b-2762-43b8-85e5-41392926b07a@isocpp.org> <515FC3B0.2090803@gmail.com> Reply-To: std-proposals@isocpp.org NNTP-Posting-Host: plane.gmane.org Mime-Version: 1.0 Content-Type: multipart/alternative; boundary=047d7b2e0887dba6eb04d9afa839 X-Trace: ger.gmane.org 1365268744 17367 80.91.229.3 (6 Apr 2013 17:19:04 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Sat, 6 Apr 2013 17:19:04 +0000 (UTC) To: std-proposals@isocpp.org Original-X-From: std-proposals+bncBC5JHI7A7ALRB74SQCFQKGQE4F6NVCA@isocpp.org Sat Apr 06 19:19:06 2013 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 1UOWI5-0006My-HR for gclcip-std-proposals@m.gmane.org; Sat, 06 Apr 2013 18:48:33 +0200 Original-Received: by mail-ie0-f198.google.com with SMTP id 17sf26114096iea.9 for ; Sat, 06 Apr 2013 09:48:32 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=x-received:x-beenthere:x-received:received-spf:mime-version :x-received:in-reply-to:references:date:message-id:subject:from:to :x-original-sender:x-original-authentication-results:reply-to :precedence:mailing-list:list-id:x-google-group-id:list-post :list-help:list-archive:list-subscribe:list-unsubscribe:content-type; bh=fyI2MqRDHr2T2V95rBydzieLhNup0ovTsX9hZXq2qew=; b=RJ9BfRZv1JUBE6j71fIOIxNga0hXkn2uVVZJ/gPwbo0bVZ2nCX8cJGPW/VCngaP6Pw JlR7g1AilVGWlPIBkPChwN1iKeERENMGbwYa1lzj3vap0KcspNvc1jqcj//cDWRm9w1q 6/iyaDh5QHg55po/MSxtCuNK6y+WFkir+AHjwYDyZsB+lzhUcHExNlbslqfCQTjpM3nc SBV5k3igDNAeRrU5nS7R78dLLizv0AAaC60rlR7tpdb7cXTq3D9jIb7SOQi/Erj67Gzh QYszqnezXwqwBRgTLjLrsi8qf02pzWQawvR0STyLmfQId3b6V6OW/zqFsMpM8ty0+JY3 X-Received: by 10.182.85.227 with SMTP id k3mr1792051obz.11.1365248383522; Sat, 06 Apr 2013 04:39:43 -0700 (PDT) X-BeenThere: std-proposals@isocpp.org Original-Received: by 10.182.160.9 with SMTP id xg9ls527231obb.62.gmail; Sat, 06 Apr 2013 04:39:42 -0700 (PDT) X-Received: by 10.182.127.7 with SMTP id nc7mr10748614obb.94.1365248382422; Sat, 06 Apr 2013 04:39:42 -0700 (PDT) Original-Received: from mail-ob0-x22f.google.com (mail-ob0-x22f.google.com [2607:f8b0:4003:c01::22f]) by mx.google.com with ESMTPS id s6si14103594obi.170.2013.04.06.04.39.42 (version=TLSv1 cipher=ECDHE-RSA-RC4-SHA bits=128/128); Sat, 06 Apr 2013 04:39:42 -0700 (PDT) Received-SPF: pass (google.com: domain of ville.voutilainen@gmail.com designates 2607:f8b0:4003:c01::22f as permitted sender) client-ip=2607:f8b0:4003:c01::22f; Original-Received: by mail-ob0-f175.google.com with SMTP id va7so4396824obc.6 for ; Sat, 06 Apr 2013 04:39:42 -0700 (PDT) X-Received: by 10.60.142.103 with SMTP id rv7mr10368808oeb.34.1365248382292; Sat, 06 Apr 2013 04:39:42 -0700 (PDT) Original-Received: by 10.76.10.130 with HTTP; Sat, 6 Apr 2013 04:39:42 -0700 (PDT) In-Reply-To: X-Original-Sender: ville.voutilainen@gmail.com X-Original-Authentication-Results: mx.google.com; spf=pass (google.com: domain of ville.voutilainen@gmail.com designates 2607:f8b0:4003:c01::22f as permitted sender) smtp.mail=ville.voutilainen@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:3585 Archived-At: --047d7b2e0887dba6eb04d9afa839 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable On 6 April 2013 12:23, wrote: > Le samedi 6 avril 2013 08:41:52 UTC+2, Chip Salzenberg a =E9crit : > >> On 4/5/2013 3:23 PM, Tony V E wrote: >> > label: for (;;) >> > { >> > break label; >> > } >> >> Yes, please; if this must be done, this is the way. It's one of the >> things that's actually worth borrowing from Perl. The label is >> semantically useful, and not brittle if another level is added. Thus: >> >> line: >> while (cin >> s) { >> ... >> if (COND) continue line; >> ... >> } >> > > That seems to be the only viable way to go for this kind of problem. The > break 1, break 2, break 3, etc... is easy to understand but, even as a > compile-time constant, I dont want to imagine what could be done with suc= h > a construct (well, I don't want to know, but never see it in real code): > > Sure, java has a similar labeled-break. I just don't see much reason to have such a labeled-break instead of goto. --=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/?hl=3Den. --047d7b2e0887dba6eb04d9afa839 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable
On 6= April 2013 12:23, <morwenn29@gmail.com> wrote:
Le samedi 6 avril 2013 08:41:52 UTC+2, Chip Salzenberg a =E9crit=A0:
On 4/5/2013 3:23 PM, Ton= y V E wrote:
> label: for (;;)
> {
> =A0 =A0break label;
> }

Yes, please; if this must be done, this is the way. =A0It's one of = the
things that's actually worth borrowing from Perl. =A0The label is
semantically useful, and not brittle if another level is added. =A0Thus= :

=A0 =A0 line:
=A0 =A0 =A0 while (cin >> s) {
=A0 =A0 =A0 =A0 =A0 ...
=A0 =A0 =A0 =A0 =A0 if (COND) continue line;
=A0 =A0 =A0 =A0 =A0 ...
=A0 =A0 =A0 }
=A0
=A0That seems to= be the only viable way to go for this kind of problem. The break 1, break = 2, break 3, etc... is easy to understand but, even as a compile-time consta= nt, I dont want to imagine what could be done with such a construct (well, = I don't want to know, but never see it in real code):


Sure, java has a similar labeled= -break. I just don't see much reason to have such a labeled-break inste= ad of goto.

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