220 20755 <36773CE4-9980-40C0-806A-05CA359D5599@gmail.com> article Path: news.gmane.org!not-for-mail From: David Krauss Newsgroups: gmane.comp.lang.c++.isocpp.proposals Subject: =?UTF-8?Q?=5Bstd=2Dproposals=5D_Draft_D0045_=E2=80=94_Overloaded_and_quali?= =?UTF-8?Q?fied_std=3A=3Afunction?= Date: Thu, 24 Sep 2015 16:55:02 +0800 Lines: 91 Approved: news@gmane.org Message-ID: <36773CE4-9980-40C0-806A-05CA359D5599@gmail.com> Reply-To: std-proposals@isocpp.org NNTP-Posting-Host: plane.gmane.org Mime-Version: 1.0 (Mac OS X Mail 8.2 \(2104\)) Content-Type: multipart/alternative; boundary="Apple-Mail=_014124F4-2442-4E08-A70E-822E09691DAD" X-Trace: ger.gmane.org 1443084928 19916 80.91.229.3 (24 Sep 2015 08:55:28 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Thu, 24 Sep 2015 08:55:28 +0000 (UTC) Cc: Matt Calabrese , Geoffrey Romer To: ISO C++ Standard - Future Proposals Original-X-From: std-proposals+bncBCW25A7E3QCRB3HUR2YAKGQEB22FMEI@isocpp.org Thu Sep 24 10:55:17 2015 Return-path: Envelope-to: gclcip-std-proposals@m.gmane.org Original-Received: from mail-pa0-f70.google.com ([209.85.220.70]) by plane.gmane.org with esmtp (Exim 4.69) (envelope-from ) id 1Zf2J9-0000QC-Ii for gclcip-std-proposals@m.gmane.org; Thu, 24 Sep 2015 10:55:15 +0200 Original-Received: by pacgz1 with SMTP id gz1sf113094925pac.0 for ; Thu, 24 Sep 2015 01:55:09 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:from:content-type:subject:date:message-id:cc:to :mime-version: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=OgpdDNrihEyNYD5//vivtn1rLPm1tOS0/u40zpJzuWc=; b=c3MeOQICPOSE83sqrBa4KzvF8NkxtsrAo6Mh1N2hjE0pi9njC8HwXiuvBZebru09HA 75feKPk6VUjcbI4IDIHawXw9sYZJKcbfkLl55+gD9rl5HRd/q0ZNjiQB9kMXYVTGcyXh 4IveX6Hc5V1y/HRTH89wm9WqvxAVNx3Y7X7OEqUzdciwvrCwr8d4NvqUBqv2BB3i3RnN bPZdAtSaGcF265WLFjvZACAcMapgDG2/09LoE58bS6t04y3i4BygS7oARVxebFwiDX3C fe5cZwskjij8CzItayWhTJGW358WSjIRP2rYPZDjqGqQ1ONhBzivYcjpgXloBeIp5+x5 CWiQ== X-Gm-Message-State: ALoCoQm6IiYaF2bbTkJU9QWxHWqCY97XktqR019CCAi11260PonNFHf6J9PCF+D39fgk8/QuqPqz X-Received: by 10.66.100.233 with SMTP id fb9mr30756453pab.24.1443084909371; Thu, 24 Sep 2015 01:55:09 -0700 (PDT) X-BeenThere: std-proposals@isocpp.org Original-Received: by 10.107.136.210 with SMTP id s79ls664057ioi.76.gmail; Thu, 24 Sep 2015 01:55:08 -0700 (PDT) X-Received: by 10.107.170.32 with SMTP id t32mr44277508ioe.173.1443084908558; Thu, 24 Sep 2015 01:55:08 -0700 (PDT) Original-Received: from mail-pa0-x236.google.com (mail-pa0-x236.google.com. [2607:f8b0:400e:c03::236]) by mx.google.com with ESMTPS id z14si124391igp.63.2015.09.24.01.55.08 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Thu, 24 Sep 2015 01:55:08 -0700 (PDT) Received-SPF: pass (google.com: domain of potswa@gmail.com designates 2607:f8b0:400e:c03::236 as permitted sender) client-ip=2607:f8b0:400e:c03::236; Original-Received: by padhy16 with SMTP id hy16so67440470pad.1 for ; Thu, 24 Sep 2015 01:55:08 -0700 (PDT) X-Received: by 10.68.176.227 with SMTP id cl3mr43349962pbc.8.1443084908226; Thu, 24 Sep 2015 01:55:08 -0700 (PDT) Original-Received: from [172.20.10.2] ([121.54.54.187]) by smtp.gmail.com with ESMTPSA id bz1sm12370650pad.36.2015.09.24.01.55.06 (version=TLSv1/SSLv3 cipher=OTHER); Thu, 24 Sep 2015 01:55:07 -0700 (PDT) X-Mailer: Apple Mail (2.2104) 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:c03::236 as permitted sender) smtp.mailfrom=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-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:20755 Archived-At: --Apple-Mail=_014124F4-2442-4E08-A70E-822E09691DAD Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=UTF-8 Another day, another draft. This is my fourth std::function-related proposa= l for Kona, and I saved the best for last. Abstract: std::function supports exactly one function signature at a time. Multiple, = overloaded signatures have many uses: exposing several functionalities of a= class, accessing data within the target object, discriminating between acc= ess as const, non-const, rvalue, lvalue, etc. Several third-party libraries= address the niche, but the role of const is controversial and ref-qualifie= rs receive little attention. This proposal replaces std::function = with std::function, where Sig is any type allowed for member functi= ons. The const dilemma is resolved without breakage. A quality prototype im= plementation is provided. PDF: bit.ly/qofun Implementation: https://github.com/potswa/cxx_function --=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/. --Apple-Mail=_014124F4-2442-4E08-A70E-822E09691DAD Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset=UTF-8 Another day, an= other draft. This is my fourth std::= function-related proposal for Kona, and I saved the best for last.
Abstract:

std::function supports= exactly one function signature at a time. Multiple, overloaded signatures = have many uses: exposing several functionalities of a class, accessing data= within the target object, discriminating between access as const, non-const, = rvalue, lvalue, etc. Several third-party libraries address the niche, but t= he role of const is controversial and <= i class=3D"">ref-qualifiers receive little attention. This proposal rep= laces std::function<R(P...)> with= std::function<Sig...>, where Sig is any type allowed for member functio= ns. The const dilemma is resolved witho= ut breakage. A quality prototype implementation is provided.

PDF: bit.ly/qofun
Implementation: https://github.com/p= otswa/cxx_function

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