220 18000 article Path: news.gmane.org!not-for-mail From: Nevin Liber Newsgroups: gmane.comp.lang.c++.isocpp.proposals Subject: Re: Re: First draft: Non-copyable call wrapper, std::unique_function Date: Tue, 19 May 2015 15:02:48 -0500 Lines: 62 Approved: news@gmane.org Message-ID: References: <59ED9069-2650-44E2-B00E-0E56ED37B83D@gmail.com> <27a788e7-4912-4a58-8201-79138ddf15a3@isocpp.org> Reply-To: std-proposals@isocpp.org NNTP-Posting-Host: plane.gmane.org Mime-Version: 1.0 Content-Type: multipart/alternative; boundary=089e01419ad2dec34c051674cd20 X-Trace: ger.gmane.org 1432065812 18527 80.91.229.3 (19 May 2015 20:03:32 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Tue, 19 May 2015 20:03:32 +0000 (UTC) To: "std-proposals@isocpp.org" Original-X-From: std-proposals+bncBCE35H5S6IDBBEVO52VAKGQEU6AULQI@isocpp.org Tue May 19 22:03:32 2015 Return-path: Envelope-to: gclcip-std-proposals@m.gmane.org Original-Received: from mail-wg0-f72.google.com ([74.125.82.72]) by plane.gmane.org with esmtp (Exim 4.69) (envelope-from ) id 1Yunjf-0000NR-TL for gclcip-std-proposals@m.gmane.org; Tue, 19 May 2015 22:03:31 +0200 Original-Received: by wgtl5 with SMTP id l5sf9665041wgt.1 for ; Tue, 19 May 2015 13:03:31 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:mime-version:sender:in-reply-to:references:from :date:message-id:subject:to:content-type:x-original-sender :x-original-authentication-results:reply-to:precedence:mailing-list :list-id:list-post:list-help:list-archive:list-subscribe :list-unsubscribe; bh=15kZiTJ3zThBwfFapTTCEl788uNzKeJIkAfvPRE4w+g=; b=Wblf8aHihB+PxvngFNt0YEYiwXLYjm9pmzxRsSx8YiSec4GWrCTvaLaRcX3RIoaKLb GLWlhlNq+014hBWrWaiv15pvxay+phLNsdFuNBR3gAZCFhVNWWuHBGhOPf/2CaSiZ2dT tpF8DEWYhC2TQwjSbhNkGPCo/VLlMxaIp7ul4nwjMyOeWsu0Gi8uUU+EgTEeaSrSc1K1 fqDFLmF1IfzbqU7cqXZDKDW8oQLdNJKR/bjCVNQN5iE/kdML5kBQBhMZZbqmGBpHG1cb Owzq4nGXknbvIvA3GHkh1Kjc7lilPFU1zWvx73DHMPEPXMCCzADSdYbkv6hTyrb/Mk1W 4qtQ== X-Gm-Message-State: ALoCoQmPksV/4PQ8AMGohRInNan5iBks6fwp+rEPWw7DlMgVnaRsK9wNy07Oz/GFtO3cThZwUCWb X-Received: by 10.112.26.5 with SMTP id h5mr23393362lbg.4.1432065811469; Tue, 19 May 2015 13:03:31 -0700 (PDT) X-BeenThere: std-proposals@isocpp.org Original-Received: by 10.152.2.193 with SMTP id 1ls115000law.41.gmail; Tue, 19 May 2015 13:03:29 -0700 (PDT) X-Received: by 10.112.126.136 with SMTP id my8mr22917023lbb.18.1432065809800; Tue, 19 May 2015 13:03:29 -0700 (PDT) Original-Received: from mail-la0-x22a.google.com (mail-la0-x22a.google.com. [2a00:1450:4010:c03::22a]) by mx.google.com with ESMTPS id q1si9738007lbr.116.2015.05.19.13.03.29 for (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Tue, 19 May 2015 13:03:29 -0700 (PDT) Received-SPF: pass (google.com: domain of nliber@gmail.com designates 2a00:1450:4010:c03::22a as permitted sender) client-ip=2a00:1450:4010:c03::22a; Original-Received: by lagr1 with SMTP id r1so41583272lag.0 for ; Tue, 19 May 2015 13:03:29 -0700 (PDT) X-Received: by 10.152.5.98 with SMTP id r2mr11581391lar.101.1432065809496; Tue, 19 May 2015 13:03:29 -0700 (PDT) Original-Sender: nliber@gmail.com Original-Received: by 10.114.79.6 with HTTP; Tue, 19 May 2015 13:02:48 -0700 (PDT) In-Reply-To: X-Original-Sender: nevin@eviloverlord.com X-Original-Authentication-Results: mx.google.com; spf=pass (google.com: domain of nliber@gmail.com designates 2a00:1450:4010:c03::22a as permitted sender) smtp.mail=nliber@gmail.com; dkim=pass header.i=@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:18000 Archived-At: --089e01419ad2dec34c051674cd20 Content-Type: text/plain; charset=UTF-8 On 19 May 2015 at 14:40, Nicol Bolas wrote: > Well, the reason it's not noexcept is that `unique_function` is allowed to > store non-moveable types. And since the type is erased (unlike, say, > non-moveable std::vector), the only way to signal an error when you attempt > to move it is to throw an exception. > The libc++ version of std::function has a noexcept move constructor, and other implementers are looking to follow suit. -- Nevin ":-)" Liber (847) 691-1404 -- --- 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/. --089e01419ad2dec34c051674cd20 Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: quoted-printable
On 1= 9 May 2015 at 14:40, Nicol Bolas <jmckesson@gmail.com> wro= te:
Well, the reaso= n it's not noexcept is that `unique_function` is allowed to store non-m= oveable types. And since the type is erased (unlike, say, non-moveable std:= :vector), the only way to signal an error when you attempt to move it is to= throw an exception.=C2=A0

The = libc++ version of std::function has a noexcept move constructor, and other = implementers are looking to follow suit.=C2=A0
--
=C2=A0Nevin ":-)" Liber=C2=A0 <mailto:nevin@eviloverlord= ..com>=C2=A0 (847) 691-1404

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