220 12199 article Path: news.gmane.org!not-for-mail From: Zhihao Yuan Newsgroups: gmane.comp.lang.c++.isocpp.proposals Subject: Re: Fwd: Study on usage of break label / continue label Date: Thu, 7 Aug 2014 19:24:07 -0400 Lines: 124 Approved: news@gmane.org Message-ID: References: Reply-To: std-proposals@isocpp.org NNTP-Posting-Host: plane.gmane.org Mime-Version: 1.0 Content-Type: multipart/alternative; boundary="001a1133fe389a623d05001262ee" X-Trace: ger.gmane.org 1407453859 15391 80.91.229.3 (7 Aug 2014 23:24:19 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Thu, 7 Aug 2014 23:24:19 +0000 (UTC) To: "std-proposals@isocpp.org" Original-X-From: std-proposals+bncBCSKRWMD4EHBBGMVSCPQKGQEL3KJJJA@isocpp.org Fri Aug 08 01:24:13 2014 Return-path: Envelope-to: gclcip-std-proposals@m.gmane.org Original-Received: from mail-qg0-f72.google.com ([209.85.192.72]) by plane.gmane.org with esmtp (Exim 4.69) (envelope-from ) id 1XFX2Y-0007L4-LG for gclcip-std-proposals@m.gmane.org; Fri, 08 Aug 2014 01:24:10 +0200 Original-Received: by mail-qg0-f72.google.com with SMTP id q107sf13219197qgd.11 for ; Thu, 07 Aug 2014 16:24:09 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:mime-version:in-reply-to:references:date :message-id:subject:from:to:sender: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=h4bR+pFyg9vEepUMpe0TwJ530mfAB9AOHuzwZ9gzBt0=; b=T3zW3g+PHOM/M00oLdkN8KH48OZiQfMhqQQMtDJXAx/p2BlrX+uIwTCqQ2kdEI44Nx AxspkH/AZoECqPdWTWXrNIKRQHa4zwN2gZYhCQTuOYzj/jAebNOChNqGs5Jb8/sauLR0 ggFMMkM6b4fDXzlAVFbrkwxHZw8/3BKMV/uWZayPhQXM275w0KaYAZ9bSkI+Q5tpApeN nUhEGDq2uqPf2030LUWGcTH6jHq/zCFcGLUjuUnM3AI+OyeIkP1UNbyWSwprLGQyGoPv rKbtULGq2uEdD03kYHh3wBmw0t6P3aoyu58/pdx6w8Y10KPlr+PnPyphDGSeQtt4QM+l wwEQ== X-Gm-Message-State: ALoCoQnUZHGZPXogERINza3AI0x3TUFU1whKGuSwIgbjomWs7oODHIbTT5fCA80yMBmL3y0IjImI X-Received: by 10.236.111.106 with SMTP id v70mr2888929yhg.21.1407453849869; Thu, 07 Aug 2014 16:24:09 -0700 (PDT) X-BeenThere: std-proposals@isocpp.org Original-Received: by 10.140.93.34 with SMTP id c31ls341645qge.92.gmail; Thu, 07 Aug 2014 16:24:09 -0700 (PDT) X-Received: by 10.220.181.196 with SMTP id bz4mr18921866vcb.36.1407453849099; Thu, 07 Aug 2014 16:24:09 -0700 (PDT) Original-Received: from mail-s68.mailgun.info (mail-s68.mailgun.info. [184.173.153.196]) by mx.google.com with ESMTPS id vp2si2314794vcb.66.2014.08.07.16.24.08 for (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Thu, 07 Aug 2014 16:24:08 -0700 (PDT) Received-SPF: pass (google.com: domain of bounce+3f9131.69110-std-proposals=isocpp.org@miator.net designates 184.173.153.196 as permitted sender) client-ip=184.173.153.196; Original-Received: from mail-vc0-f181.google.com (mail-vc0-f181.google.com [209.85.220.181]) by mxa.mailgun.org with ESMTP id 53e40a97.59bbc30-in1; Thu, 07 Aug 2014 23:24:07 -0000 (UTC) Original-Received: by mail-vc0-f181.google.com with SMTP id lf12so7243314vcb.26 for ; Thu, 07 Aug 2014 16:24:07 -0700 (PDT) X-Received: by 10.53.12.225 with SMTP id et1mr4248336vdd.5.1407453847246; Thu, 07 Aug 2014 16:24:07 -0700 (PDT) Original-Received: by 10.220.40.5 with HTTP; Thu, 7 Aug 2014 16:24:07 -0700 (PDT) In-Reply-To: X-Mailgun-Sid: WyI3MTBkYiIsICJzdGQtcHJvcG9zYWxzQGlzb2NwcC5vcmciLCAiNjkxMTAiXQ== Original-Sender: zy@miator.net X-Original-Sender: zy@miator.net X-Original-Authentication-Results: mx.google.com; spf=pass (google.com: domain of bounce+3f9131.69110-std-proposals=isocpp.org@miator.net designates 184.173.153.196 as permitted sender) smtp.mail=bounce+3f9131.69110-std-proposals=isocpp.org@miator.net; dkim=pass header.i=@miator.net 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:12199 Archived-At: --001a1133fe389a623d05001262ee Content-Type: text/plain; charset=UTF-8 On Thu, Aug 7, 2014 at 6:00 PM, Andrew Tomazos wrote: I've conducted a quick study of ~50,000,000 lines of production Java code > extracted from the Ubuntu package repository for usages of break label / > continue label. Results attached. > > No one read 80 pages of code. Package them and upload to somewhere is enough. However, I'm *no one* -- I read all of 100 examples, and the below is my analysis. I observed six purposes of using labeled continue / break: Type (count). explaination A (35). inside `switch`, to disambiguate from `break`. B (14). generated code, to disambiguate from `break`, but can use `goto` in C++ instead. C (36). breaking out from an inner loop. D (8). useless, user just want to name a block. E (2). wrong sample, code is inside comment. F (2). cannot determine, but should be A or C. Unfortunately I lost 3 samples. If you think A and B are the same (not quite), then breaking out from `switch` seems to be the major use case. Here comes my question: do we just need a keyword/contextual keyword to save `switch`? Like case ...: break loop: ... continue loop: // `loop` is a contextual keyword -- Zhihao Yuan, ID lichray The best way to predict the future is to invent it. ___________________________________________________ 4BSD -- http://bit.ly/blog4bsd -- --- 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/. --001a1133fe389a623d05001262ee Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: quoted-printable
On Thu, Aug 7, 2014 at 6:00 PM, Andrew Tomazos <a= ndrewtomazos@gmail.com> wrote:
=

I've conducted a quick study of ~50,000,000 lines = of production Java code extracted from the Ubuntu package repository for us= ages of break label / continue label. =C2=A0Results attached.


No one read 80 pages of code.=C2=A0 Package them and upload to som= ewhere
is enough.

However, I'm *no one* -- I read all of 100 examples, and the below is m= y
analysis.

I observed six purpo= ses of using labeled continue / break:

Type (count). explaination

A (35). inside `switch`, to disambiguate from `bre= ak`.
B (14). generated code, to disambi= guate from `break`, but can use
=C2=A0=C2=A0=C2=A0 `goto` in C++ instead.<= br>
C (36). breaking out from an inner loop= ..
D (8).=C2=A0 useless, user just want = to name a block.
E (2).=C2=A0 wrong sample, code is inside commen= t.
F (2).=C2=A0 cannot determine, but s= hould be A or C.

Unfortunately I lo= st 3 samples.

If yo= u think A and B are the same (not quite), then breaking out
from `switch` seems to be the major use case.

Here comes my question: do we just need a keyword/contextual
keyword= to save `switch`?=C2=A0 Like

=C2= =A0 case ...:
=C2=A0=C2=A0=C2=A0 break = loop:
=C2=A0=C2=A0=C2=A0 ...
=C2=A0=C2=A0=C2=A0 continue loop:=C2=A0 // `loop` is a contextual keyword

--
Zhihao Yuan, ID lichray
Th= e best way to predict the future is to invent it.
______________________= _____________________________
4BSD -- http://bit.ly/= blog4bsd

--

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