220 9162 article Path: news.gmane.org!not-for-mail From: Roman Perepelitsa Newsgroups: gmane.comp.lang.c++.isocpp.proposals Subject: Re: Any plans for enabling the use of move-only objects in std::function? Date: Thu, 6 Feb 2014 20:31:44 +0100 Lines: 85 Approved: news@gmane.org Message-ID: References: <0532b9dd-9235-4871-b16c-656145bd0781@isocpp.org> <99dbf36e-4f1b-499b-bd17-8b7a9e056e28@isocpp.org> Reply-To: std-proposals@isocpp.org NNTP-Posting-Host: plane.gmane.org Mime-Version: 1.0 Content-Type: multipart/alternative; boundary=089e012942329c881b04f1c1ed9c X-Trace: ger.gmane.org 1391715119 1803 80.91.229.3 (6 Feb 2014 19:31:59 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Thu, 6 Feb 2014 19:31:59 +0000 (UTC) To: std-proposals@isocpp.org Original-X-From: std-proposals+bncBC55TTG52EFRBNOGZ6LQKGQEP3NAHFI@isocpp.org Thu Feb 06 20:32:07 2014 Return-path: Envelope-to: gclcip-std-proposals@m.gmane.org Original-Received: from mail-yh0-f69.google.com ([209.85.213.69]) by plane.gmane.org with esmtp (Exim 4.69) (envelope-from ) id 1WBUgA-0002iX-Ux for gclcip-std-proposals@m.gmane.org; Thu, 06 Feb 2014 20:32:07 +0100 Original-Received: by mail-yh0-f69.google.com with SMTP id a41sf5629480yho.4 for ; Thu, 06 Feb 2014 11:32:06 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:mime-version: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=ESnFf9QTzsBLebrtMKCSTqS1bHZzdv2LpeVabKAFYP4=; b=bir+4szhDyzJ4jLc3xv7KDjWK1B/qCLljWQempBMpdWxPrHh6R0DnuLwkYaDS3nbc2 JvjRxjg8ncI46RAOqfMGpwS3W4fyQixK9MHdHxTMxQ/UOKMav6HKIKeU7NEsnnV3zuSZ 8IJKOMsmFaIfucUZbAk+zZ8FYbYt+f3eXqm6WSl25c5MJhoIkuu8Yf+JMzPruec3wRxO GzFqC8B4szUDfhgM/xi7D3grQ3nnc2NitIXU2lDH4AN0F0VSRcNQ0ZH3wFQJZNikfQYf cBe/8gE3gSRmV/M7nMA3Tqs1sYQjFaO0OgUgMEiGiqcotqG6bY+kkf7MqRgCDZf02CWD 8pqA== X-Gm-Message-State: ALoCoQlxZCPaSHbSHIH4GUKrhkFUeMlGw5xdW+XlISOrwjZyd4iODxhVguVndCcJ09v83mye79g8 X-Received: by 10.58.120.76 with SMTP id la12mr2510844veb.21.1391715126135; Thu, 06 Feb 2014 11:32:06 -0800 (PST) X-BeenThere: std-proposals@isocpp.org Original-Received: by 10.140.24.215 with SMTP id 81ls713126qgr.14.gmail; Thu, 06 Feb 2014 11:32:05 -0800 (PST) X-Received: by 10.52.30.167 with SMTP id t7mr2136523vdh.36.1391715125418; Thu, 06 Feb 2014 11:32:05 -0800 (PST) Original-Received: from mail-ve0-x234.google.com (mail-ve0-x234.google.com [2607:f8b0:400c:c01::234]) by mx.google.com with ESMTPS id uh1si500014vcb.100.2014.02.06.11.32.04 for (version=TLSv1 cipher=ECDHE-RSA-RC4-SHA bits=128/128); Thu, 06 Feb 2014 11:32:04 -0800 (PST) Received-SPF: pass (google.com: domain of roman.perepelitsa@gmail.com designates 2607:f8b0:400c:c01::234 as permitted sender) client-ip=2607:f8b0:400c:c01::234; Original-Received: by mail-ve0-f180.google.com with SMTP id db12so1925850veb.11 for ; Thu, 06 Feb 2014 11:32:04 -0800 (PST) X-Received: by 10.58.54.15 with SMTP id f15mr6978808vep.5.1391715124281; Thu, 06 Feb 2014 11:32:04 -0800 (PST) Original-Received: by 10.58.179.40 with HTTP; Thu, 6 Feb 2014 11:31:44 -0800 (PST) In-Reply-To: <99dbf36e-4f1b-499b-bd17-8b7a9e056e28@isocpp.org> X-Original-Sender: roman.perepelitsa@gmail.com X-Original-Authentication-Results: mx.google.com; spf=pass (google.com: domain of roman.perepelitsa@gmail.com designates 2607:f8b0:400c:c01::234 as permitted sender) smtp.mail=roman.perepelitsa@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:9162 Archived-At: --089e012942329c881b04f1c1ed9c Content-Type: text/plain; charset=ISO-8859-1 2014-02-06 Scott Prager : > > On Thursday, February 6, 2014 1:33:26 PM UTC-5, Nevin ":-)" Liber wrote: > >> Or a throwing wrapper if an attempt is made to copy a move-only functor? >> >> Just adding to the design space, >> -- >> Nevin ":-)" Liber (847) 691-1404 >> > > Similarly, move_only_function? > That is my preferred solution and that's what I use in my code: I have class template mfunction which is exactly the same as std::function but not copyable (it's movable, though). By giving up the ability to copy type erased functor you allow it to be constructed from non-copyable function objects. That's a great trade off. I found the necessity to copy std::function to be very rare, thus mfunction can be used in the vast majority of interfaces. Roman Perepelitsa. -- --- 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/. --089e012942329c881b04f1c1ed9c Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable
2014= -02-06 Scott Prager <splinterofchaos@gmail.com>:
=

On Thur= sday, February 6, 2014 1:33:26 PM UTC-5, Nevin ":-)" Liber wrote:=
Or = a throwing wrapper if an attempt is made to copy a move-only functor?
Just adding to the design space,
--
=A0Nevin ":-)" Liber=A0 <mailto:ne...@eviloverlord.com<= u>>=A0 (847) 691-1404

Similarly, move_only_function?

That is my preferred solution and that's what I us= e in my code: I have class template mfunction<F> which is exactly the= same as std::function<F> but not copyable (it's movable, though)= .. By giving up the ability to copy type erased functor you allow it to be c= onstructed from non-copyable function objects. That's a great trade off= .. I found the necessity to copy std::function to be very rare, thus mfuncti= on can be used in the vast majority of interfaces.

Roman Perepelitsa.

--
 
---
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-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/<= /a>.
--089e012942329c881b04f1c1ed9c-- .