220 24619 <56CC82E9.8070601@gmail.com> article Path: news.gmane.org!not-for-mail From: Matthew Woehlke Newsgroups: gmane.comp.lang.c++.isocpp.proposals Subject: Re: throwaway variable Date: Tue, 23 Feb 2016 11:03:53 -0500 Lines: 33 Approved: news@gmane.org Message-ID: <56CC82E9.8070601@gmail.com> References: <9658e852-6254-4ecf-a6d4-879160d4de7d@isocpp.org> Reply-To: std-proposals@isocpp.org NNTP-Posting-Host: plane.gmane.org Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8 X-Trace: ger.gmane.org 1456243452 32082 80.91.229.3 (23 Feb 2016 16:04:12 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Tue, 23 Feb 2016 16:04:12 +0000 (UTC) Cc: potswa@gmail.com To: std-proposals@isocpp.org Original-X-From: std-proposals+bncBC37LBFWUIFBB4MFWK3AKGQEYFCNC6Q@isocpp.org Tue Feb 23 17:04:05 2016 Return-path: Envelope-to: gclcip-std-proposals@m.gmane.org Original-Received: from mail-wm0-f69.google.com ([74.125.82.69]) by plane.gmane.org with esmtp (Exim 4.69) (envelope-from ) id 1aYFRU-0006MB-KV for gclcip-std-proposals@m.gmane.org; Tue, 23 Feb 2016 17:04:04 +0100 Original-Received: by mail-wm0-f69.google.com with SMTP id a4sf62170636wme.2 for ; Tue, 23 Feb 2016 08:04:04 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=isocpp-org.20150623.gappssmtp.com; s=20150623; h=to:from:subject:date:lines:message-id:references:mime-version :content-type:cc:user-agent:in-reply-to:x-original-sender :x-original-authentication-results:reply-to:precedence:mailing-list :list-id:x-spam-checked-in-group:list-post:list-help:list-archive :list-subscribe:list-unsubscribe; bh=CZQvJsRwQxS1f0g1tSrjUlBMpxs5XDx8NU9crNd0pWs=; b=Cpjwggwo4LGSihO+6cHgxWBde6KEQsCTnAIHGmFH7VRHkYDOHbwh+Kld7nMw5OgR5f HOqmqc1lNNVx6NCG+iHk/6FZNCkEEwsEUXqYwDAozqRAg8ojEf1HE/Do28kMjIawjPB8 HVemdvkOXaxcrZ5ImjrkTUEC/GzUlTuNsUe3O05reR5BXYiPBe/qsHDcbwXIftPSLYce tjx0TQG/BYrTJPG1u6I/Wowg3vr4khaBHqFI4GJdMYQk9qydQspLJCHdM83BYHnJPk0+ IeSrYHKA57XVnrg5DKxSBHcZAU++V11mT+1oPhExDl7M5h0Hi4QHvTmDnSLlQWn6+F9p X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:to:from:subject:date:lines:message-id:references :mime-version:content-type:cc:user-agent:in-reply-to :x-original-sender:x-original-authentication-results:reply-to :precedence:mailing-list:list-id:x-spam-checked-in-group:list-post :list-help:list-archive:list-subscribe:list-unsubscribe; bh=CZQvJsRwQxS1f0g1tSrjUlBMpxs5XDx8NU9crNd0pWs=; b=TZ6bOWqqfQu953wWiOQ/QFy6x90deHQHCnxrVB1yTy59hnk1fM6cX0ijuDUT/tuCU5 LSOeMw5FxWsZipGP62Btg/2UxpCB4BQxu4cV9YtgSp+XDq+neIVqomaNrKl9aBuwK09E HdbI/SRWU4G/w3uvOKqyb8jVn5Lg/k+s0PpMCYmgddVL1PCbrPW2paYp5pW5lzbcOSZQ haCgco1BiAdGRL/1MO0veAiWCrmfwGaLInEJoQ1u5/Z4g3ESmZoxoeyyN6HxvvPTOUte F7wlXxPEynskNimeaDsjeU0WHB6WPSTGx2de/Spdx7cwPP+v373THyas2Q+y1Z60XthW X-Gm-Message-State: AG10YOQ04C5xEl9rVf1KOnF8hZXmzUKRpRZ4ev72S/DuX0pLla+1aLuFj9UG8axVKybOxg== X-Received: by 10.194.172.40 with SMTP id az8mr4256436wjc.3.1456243444102; Tue, 23 Feb 2016 08:04:04 -0800 (PST) X-BeenThere: std-proposals@isocpp.org Original-Received: by 10.25.142.213 with SMTP id q204ls458886lfd.15.gmail; Tue, 23 Feb 2016 08:04:00 -0800 (PST) X-Received: by 10.25.211.70 with SMTP id k67mr12640750lfg.119.1456243440782; Tue, 23 Feb 2016 08:04:00 -0800 (PST) Original-Received: from plane.gmane.org (plane.gmane.org. [80.91.229.3]) by mx.google.com with ESMTPS id jg7si145426lbc.113.2016.02.23.08.04.00 for (version=TLS1 cipher=AES128-SHA bits=128/128); Tue, 23 Feb 2016 08:04:00 -0800 (PST) Received-SPF: pass (google.com: domain of gclcip-std-proposals@m.gmane.org designates 80.91.229.3 as permitted sender) client-ip=80.91.229.3; Original-Received: from list by plane.gmane.org with local (Exim 4.69) (envelope-from ) id 1aYFRP-0006Io-G4 for std-proposals@isocpp.org; Tue, 23 Feb 2016 17:03:59 +0100 Original-Received: from tripoint.kitware.com ([66.194.253.20]) by main.gmane.org with esmtp (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Tue, 23 Feb 2016 17:03:59 +0100 Original-Received: from mwoehlke.floss by tripoint.kitware.com with local (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Tue, 23 Feb 2016 17:03:59 +0100 X-Injected-Via-Gmane: http://gmane.org/ Original-Lines: 26 Original-X-Complaints-To: usenet@ger.gmane.org X-Gmane-NNTP-Posting-Host: tripoint.kitware.com User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.7.0 In-Reply-To: X-Original-Sender: mwoehlke.floss@gmail.com X-Original-Authentication-Results: mx.google.com; spf=pass (google.com: domain of gclcip-std-proposals@m.gmane.org designates 80.91.229.3 as permitted sender) smtp.mailfrom=gclcip-std-proposals@m.gmane.org; dmarc=fail (p=NONE dis=NONE) header.from=gmail.com Precedence: list Mailing-list: list std-proposals@isocpp.org; contact std-proposals+owners@isocpp.org List-ID: X-Spam-Checked-In-Group: std-proposals@isocpp.org 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:24619 Archived-At: On 2016-02-23 10:49, Viacheslav Usov wrote: > On Tue, Feb 23, 2016 at 4:41 PM, Matthew Woehlke wrote: >> ...wasn't there a proposal floating around to do that automatically, >> though? > > I am not aware of a such a proposal; any pointers? http://wg21.link/n4221 ...and you may want to ping David Krauss (CC'd) as to what ever happened with it, as I don't recall offhand. > If that proposal pins a temporary to the scope when it is used in some > particular way, then perhaps it would be equivalent. But then one of those > "particular ways" should include something that the equivalent of > > { > @std::lock_guard(mutex); > // do things > } > > were easily expressible. I don't think it tried to cover this; only where the entity was still accessible, albeit indirectly or only partially. -- Matthew -- 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. To view this discussion on the web visit https://groups.google.com/a/isocpp.org/d/msgid/std-proposals/56CC82E9.8070601%40gmail.com. .