220 6989 article Path: news.gmane.org!not-for-mail From: Zhihao Yuan Newsgroups: gmane.comp.lang.c++.isocpp.proposals Subject: Re: Unnamed LValues Date: Fri, 4 Oct 2013 22:06:34 -0400 Lines: 40 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: text/plain; charset=ISO-8859-1 X-Trace: ger.gmane.org 1380938797 15267 80.91.229.3 (5 Oct 2013 02:06:37 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Sat, 5 Oct 2013 02:06:37 +0000 (UTC) To: "std-proposals@isocpp.org" Original-X-From: std-proposals+bncBCSKRWMD4EHBBLPIXWJAKGQEN3FUT3Q@isocpp.org Sat Oct 05 04:06:41 2013 Return-path: Envelope-to: gclcip-std-proposals@m.gmane.org Original-Received: from mail-qa0-f69.google.com ([209.85.216.69]) by plane.gmane.org with esmtp (Exim 4.69) (envelope-from ) id 1VSHGR-0002ir-9F for gclcip-std-proposals@m.gmane.org; Sat, 05 Oct 2013 04:06:39 +0200 Original-Received: by mail-qa0-f69.google.com with SMTP id cm18sf4164177qab.4 for ; Fri, 04 Oct 2013 19:06:38 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=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=dv3IbUs8g3/HdDUyOjfwz3OBTEitwEx7AuMJiVEJbbw=; b=dSnZ/OWgUMQaowUkx0hhw9nXbrSJOoYbvUdA6ez+L1aWSWdlkmmHcSRWvpyCDckYID oOFmDn8c21l1hHsdiaZEUkVo66EZjOUYDaIynW2AjCP5O1KATL9SZN0j7By93OqSfic/ +YU15nEssVPGQup4UQtqI8nR1C/ytMTwBSTa69oEKp6GkqhDwJnknKEdJw66KEBMZbud FviUS9hX0q06QS3PWX0q+G6YY1cD7gfvD7Nd7bPdSyh6oCUkq04ok42/WOfUQsBjtZzc ujq2Gxt6NvHowxYr8ZdUyNBoESbBhV0/Z4SjdCFCg+XX3JU9BkCLLy46wHoEGUnqYqZU QvLQ== X-Received: by 10.236.116.135 with SMTP id g7mr16448247yhh.53.1380938798357; Fri, 04 Oct 2013 19:06:38 -0700 (PDT) X-BeenThere: std-proposals@isocpp.org Original-Received: by 10.49.11.179 with SMTP id r19ls1514316qeb.76.gmail; Fri, 04 Oct 2013 19:06:37 -0700 (PDT) X-Received: by 10.236.54.232 with SMTP id i68mr12668503yhc.0.1380938797773; Fri, 04 Oct 2013 19:06:37 -0700 (PDT) Original-Received: from mail-s68.mailgun.info (mail-s68.mailgun.info. [184.173.153.196]) by mx.google.com with ESMTP id u42si6325115yhc.272.1969.12.31.16.00.00; Fri, 04 Oct 2013 19:06:37 -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-vb0-f44.google.com (mail-vb0-f44.google.com [209.85.212.44]) by mxa.mailgun.org with ESMTP id 524f742b.96641b0-in1; Sat, 05 Oct 2013 02:06:35 -0000 (UTC) Original-Received: by mail-vb0-f44.google.com with SMTP id e13so2711881vbg.3 for ; Fri, 04 Oct 2013 19:06:34 -0700 (PDT) X-Received: by 10.58.117.71 with SMTP id kc7mr14981971veb.16.1380938794932; Fri, 04 Oct 2013 19:06:34 -0700 (PDT) Original-Received: by 10.220.250.6 with HTTP; Fri, 4 Oct 2013 19:06:34 -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:6989 Archived-At: On Fri, Oct 4, 2013 at 9:33 PM, Richard Smith wrote: > /*template std::lock_guard locked(Mutex &);*/ > > locked(my_mutex) { > } This reminds me Python's with statement. In C++, it may look like: with (expr) { // ... } If you need a name, with (auto name = expr) { } And I can further imagine that this requires a _compound-statement_, so that we can have struct A { A() with (expr) { } }; -- Zhihao Yuan, ID lichray The best way to predict the future is to invent it. ___________________________________________________ 4BSD -- http://4bsd.biz/ -- --- 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/. .