220 7868 <528C469D.6060805@gmail.com> article Path: news.gmane.org!not-for-mail From: David Krauss Newsgroups: gmane.comp.lang.c++.isocpp.proposals Subject: Re: Proposal to add std::mem_to_fun Date: Wed, 20 Nov 2013 13:20:29 +0800 Lines: 19 Approved: news@gmane.org Message-ID: <528C469D.6060805@gmail.com> 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; format=flowed X-Trace: ger.gmane.org 1384924834 9471 80.91.229.3 (20 Nov 2013 05:20:34 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Wed, 20 Nov 2013 05:20:34 +0000 (UTC) To: std-proposals@isocpp.org Original-X-From: std-proposals+bncBCW25A7E3QCRBI4NWGKAKGQER75XPQI@isocpp.org Wed Nov 20 06:20:37 2013 Return-path: Envelope-to: gclcip-std-proposals@m.gmane.org Original-Received: from mail-ie0-f197.google.com ([209.85.223.197]) by plane.gmane.org with esmtp (Exim 4.69) (envelope-from ) id 1Vj0DM-0007VK-Fy for gclcip-std-proposals@m.gmane.org; Wed, 20 Nov 2013 06:20:36 +0100 Original-Received: by mail-ie0-f197.google.com with SMTP id e14sf9468975iej.4 for ; Tue, 19 Nov 2013 21:20:35 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:message-id:date:from:user-agent:mime-version:to :subject:references:in-reply-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=hQkL+KMqjnpyTA4qYVuD7NqfYv1Fg6rUTPtKLEjG+34=; b=arIfVOBD+sWeM3RtuBctnUShsVdDAhczfc/KL4ULYS5KL5f/IAI68e73i7cUq6hQ7e lYfbztQtljsXUlMR6oiIniBUnYiyLqNn85wm6CjxOccqesIBqf1dRJ9fYZ7T/EMz1xKo 4i0bJFu2rCBBJ955YKCRAL2T+Fk2SxYNENqt0lNfO+FNnadYYKz5gFN323AvkrkFYaaO NwBM2VVHfGa+IlU0LC3Vku3V607oRWggD0hQpb4Y3VSKaiNjCQu+VRy1qHiPF25T+thz qudzx7X56/SYzXqTFA24CAsGUDDw1kL3uyzi4olvrbFVvhbT17Ty/D6Gtzr/pW0mCjAX mSAg== X-Gm-Message-State: ALoCoQn6ENPbNvpxf0UzaYJV42aVCPqjs16+u+6ZRXGehQBjOklUMyvztSuoi843EieJEFWnkY7n X-Received: by 10.43.152.19 with SMTP id ku19mr1984667icc.24.1384924835589; Tue, 19 Nov 2013 21:20:35 -0800 (PST) X-BeenThere: std-proposals@isocpp.org Original-Received: by 10.49.37.134 with SMTP id y6ls3320881qej.15.gmail; Tue, 19 Nov 2013 21:20:35 -0800 (PST) X-Received: by 10.236.101.133 with SMTP id b5mr27204574yhg.16.1384924835096; Tue, 19 Nov 2013 21:20:35 -0800 (PST) Original-Received: from mail-pb0-x22c.google.com (mail-pb0-x22c.google.com [2607:f8b0:400e:c01::22c]) by mx.google.com with ESMTPS id 41si3681278yhf.152.2013.11.19.21.20.34 for (version=TLSv1 cipher=ECDHE-RSA-RC4-SHA bits=128/128); Tue, 19 Nov 2013 21:20:35 -0800 (PST) Received-SPF: pass (google.com: domain of potswa@gmail.com designates 2607:f8b0:400e:c01::22c as permitted sender) client-ip=2607:f8b0:400e:c01::22c; Original-Received: by mail-pb0-f44.google.com with SMTP id rq2so2963719pbb.31 for ; Tue, 19 Nov 2013 21:20:34 -0800 (PST) X-Received: by 10.68.222.225 with SMTP id qp1mr5972527pbc.41.1384924834227; Tue, 19 Nov 2013 21:20:34 -0800 (PST) Original-Received: from Davids-MacBook-Pro.local ([121.54.54.35]) by mx.google.com with ESMTPSA id ki1sm34749876pbd.1.2013.11.19.21.20.31 for (version=TLSv1 cipher=ECDHE-RSA-RC4-SHA bits=128/128); Tue, 19 Nov 2013 21:20:33 -0800 (PST) User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.8; rv:17.0) Gecko/20130801 Thunderbird/17.0.8 In-Reply-To: X-Original-Sender: potswa@gmail.com X-Original-Authentication-Results: mx.google.com; spf=pass (google.com: domain of potswa@gmail.com designates 2607:f8b0:400e:c01::22c as permitted sender) smtp.mail=potswa@gmail.com; dkim=pass header.i=@gmail.com; dmarc=pass (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-Google-Group-Id: 399137483710 List-Post: , List-Help: , List-Archive: List-Subscribe: , List-Unsubscribe: , Xref: news.gmane.org gmane.comp.lang.c++.isocpp.proposals:7868 Archived-At: On 11/20/13 12:41 PM, dacamara.cameron@gmail.com wrote: > So I noticed browsing that there is currently not a way to > create a function object that can return just a member of an object. You can do this with std::bind, because member pointers are invokable. auto fn = std::bind( & Books::author, std::placeholders::_1 ); The resulting bind object is a functor taking either a pointer or reference to Book. -- --- 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/. .