220 12378 article Path: news.gmane.org!not-for-mail From: Nevin Liber Newsgroups: gmane.comp.lang.c++.isocpp.proposals Subject: Re: Re: Local variables that overstay their welcome Date: Wed, 20 Aug 2014 10:08:04 -0500 Lines: 105 Approved: news@gmane.org Message-ID: References: <778b6fbf-3b58-488c-9e51-32a05b95831e@isocpp.org> Reply-To: std-proposals@isocpp.org NNTP-Posting-Host: plane.gmane.org Mime-Version: 1.0 Content-Type: multipart/alternative; boundary=f46d044280c4e97535050110fa6a X-Trace: ger.gmane.org 1408547334 31792 80.91.229.3 (20 Aug 2014 15:08:54 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Wed, 20 Aug 2014 15:08:54 +0000 (UTC) To: "std-proposals@isocpp.org" Original-X-From: std-proposals+bncBCE35H5S6IDBB7PT2KPQKGQEVSCWBSI@isocpp.org Wed Aug 20 17:08:47 2014 Return-path: Envelope-to: gclcip-std-proposals@m.gmane.org Original-Received: from mail-we0-f199.google.com ([74.125.82.199]) by plane.gmane.org with esmtp (Exim 4.69) (envelope-from ) id 1XK7VG-0006V8-5O for gclcip-std-proposals@m.gmane.org; Wed, 20 Aug 2014 17:08:46 +0200 Original-Received: by mail-we0-f199.google.com with SMTP id p10sf5023636wes.6 for ; Wed, 20 Aug 2014 08:08:45 -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: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=tKvHr/2zIL8YBZq2DsJuR5N1URy8z/wp1EJzvmlI8qQ=; b=dVCrExmp8hDHcmZPJ0pFnMvhc9dVg7pDNqOzZhP6JrMLFOAG7NNPkQXJcq1CNbNLfc 4z/7kspPrY7wLHpnIBW8iAVOdTzwzUUu00ANKWhA5e8hnY00z1Bv4Z7t1K0C7EOqYAYL 7qemyREZahkXdJAywxn1E4Us8iJ9gc28wgbaEJq9f6pFyzBIznXY2A8lH7PO/B/RUlIi ksXlwayorcc2bOcTd5yGN/hQMK7/oBHEaBabIAQjKz8lH3qDh66/Z71lG11A07nFN1Tq B2WA/kyUpfHqG+HiaTyMwt4s5VXb824aq4xBXoLvYHKsKaw1oiu9XJojC//7WvJNvCmT Z4Tw== X-Gm-Message-State: ALoCoQmfLQd4G4A5mtQYW4pTTJrrsMnA6ySiKsFzH+YNaCUDtOX6GlByOYDRTQPuLTLLBBk1g+5r X-Received: by 10.112.188.136 with SMTP id ga8mr382508lbc.8.1408547325827; Wed, 20 Aug 2014 08:08:45 -0700 (PDT) X-BeenThere: std-proposals@isocpp.org Original-Received: by 10.180.208.99 with SMTP id md3ls732319wic.9.canary; Wed, 20 Aug 2014 08:08:44 -0700 (PDT) X-Received: by 10.180.211.233 with SMTP id nf9mr15491579wic.33.1408547324586; Wed, 20 Aug 2014 08:08:44 -0700 (PDT) Original-Received: from mail-we0-x22e.google.com (mail-we0-x22e.google.com [2a00:1450:400c:c03::22e]) by mx.google.com with ESMTPS id c5si4993008wie.66.2014.08.20.08.08.44 for (version=TLSv1 cipher=ECDHE-RSA-RC4-SHA bits=128/128); Wed, 20 Aug 2014 08:08:44 -0700 (PDT) Received-SPF: pass (google.com: domain of nliber@gmail.com designates 2a00:1450:400c:c03::22e as permitted sender) client-ip=2a00:1450:400c:c03::22e; Original-Received: by mail-we0-f174.google.com with SMTP id x48so8060969wes.33 for ; Wed, 20 Aug 2014 08:08:44 -0700 (PDT) X-Received: by 10.180.24.225 with SMTP id x1mr15608252wif.14.1408547324255; Wed, 20 Aug 2014 08:08:44 -0700 (PDT) Original-Sender: nliber@gmail.com Original-Received: by 10.194.242.198 with HTTP; Wed, 20 Aug 2014 08:08:04 -0700 (PDT) In-Reply-To: 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:c03::22e 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:12378 Archived-At: --f46d044280c4e97535050110fa6a Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable On 20 August 2014 09:53, Matthew Fioravante wrote: > Sorry I made a typo in the first post. Lets do a full example which shoul= d >> illuminate >> > > int i; > > struct F { > int i; > void f() { > int i; > a(i); //uses local i > kill i; > b(i); //uses data member i > kill i; > c(i); //uses global i > kill i; > d(i); //compiler error > } > }; > =E2=80=A2 If you know enough to write "kill", you know enough to avoid the = problem in the first place. =E2=80=A2 This exasperates the problem of shadowing. If people are having = problems with moved-from objects, why should I believe they can handle shadowing correctly? --=20 Nevin ":-)" Liber (847) 691-1404 --=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/. --f46d044280c4e97535050110fa6a Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: quoted-printable
On 20 August 2014 09:53, Matthew Fioravante <fmatthe= w5876@gmail.com> wrote:
Sorry I made a typo=C2=A0in the first= post.=C2=A0Lets do a full example which should illuminate
<= /div>
=C2=A0
int i;
=C2=A0
s= truct F {
=C2=A0 int i;
=C2=A0 void f() {
=C2=A0=C2=A0=C2=A0=C2= =A0 int i;
=C2=A0=C2=A0=C2=A0=C2=A0 a(i); //uses local i
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0kill i;
=C2=A0=C2=A0=C2=A0=C2=A0 = b(i); //uses data member i
=C2=A0=C2=A0=C2=A0=C2=A0 kill i;
=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0c(i); //uses global i
=C2=A0=C2=A0=C2=A0=C2=A0 kill i;
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0d(= i); //compiler error
=C2=A0 }
};
=
=E2=80=A2 If you know enough to write "kill", you = know enough to avoid the problem in the first place.

=E2=80=A2 This exasperates the problem of shadowing. = =C2=A0If people are having problems with moved-from objects, why should I b= elieve they can handle shadowing correctly?
--
=C2=A0Nevin &= quot;:-)" Liber=C2=A0 <mailto:nevin@eviloverlord.com>=C2=A0 (847) 691-1404

--

---
You received this message because you are subscribed to the Google Groups &= quot;ISO C++ Standard - Future Proposals" group.
To unsubscribe from this group and stop receiving emails from it, send an e= mail to std-proposa= ls+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/<= /a>.
--f46d044280c4e97535050110fa6a-- .