220 29830 article Path: news.gmane.org!.POSTED!not-for-mail From: Ville Voutilainen Newsgroups: gmane.comp.lang.c++.isocpp.proposals Subject: Re: New smart pointer: CopyConstructible and CopyAssignable flavor of unique_ptr Date: Fri, 16 Dec 2016 14:28:57 +0200 Lines: 42 Approved: news@gmane.org Message-ID: References: <13702f32-32c2-447f-9996-3624fd678675@isocpp.org> Reply-To: std-proposals@isocpp.org NNTP-Posting-Host: blaine.gmane.org Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable X-Trace: blaine.gmane.org 1481891345 23489 195.159.176.226 (16 Dec 2016 12:29:05 GMT) X-Complaints-To: usenet@blaine.gmane.org NNTP-Posting-Date: Fri, 16 Dec 2016 12:29:05 +0000 (UTC) To: "ISO C++ Standard - Future Proposals" Original-X-From: std-proposals+bncBC5JHI7A7ALRBCV4Z7BAKGQE72BMNSY@isocpp.org Fri Dec 16 13:28:57 2016 Return-path: Envelope-to: gclcip-std-proposals@m.gmane.org Original-Received: from mail-pf0-f199.google.com ([209.85.192.199]) by blaine.gmane.org with esmtp (Exim 4.84_2) (envelope-from ) id 1cHrd9-0004aj-84 for gclcip-std-proposals@m.gmane.org; Fri, 16 Dec 2016 13:28:55 +0100 Original-Received: by mail-pf0-f199.google.com with SMTP id 83sf119436047pfx.1 for ; Fri, 16 Dec 2016 04:29:00 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=isocpp-org.20150623.gappssmtp.com; s=20150623; h=mime-version:in-reply-to:references:from:date:message-id:subject:to :content-transfer-encoding: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=A8kUnNX2juHdW/P7fZmgsf2M0kf3AKtx2VXREedbzdA=; b=QoEmjm6iLlTIKMeedQistaw7J8FmKSHV6g4rjwWUUX2DTKB4nyvMDFYD9HzMuRQ2Li ol6HW4Bwqd3m3rj3c2DSZuY3ysbxrPDUA3slniDai9AROdNLz7mWobcW97Jr4pNKWhvb d58X6QkysB2zoevJ1WQGex/q2KkbEbi0J3TasdvV5wgXbjGfe2FW+fwcxhusok7xjEga jqw6q/FL/f5vdjoy0PhTe7EGGE9e3uCZRrc0G4mz/pMmiVef9Gth0A+MI7e7oG9RxdHg wMf2bvhGQjKAILFA99DqR8NsGIy4uI0wygQGmacAeFvD1lRFQ8oy6AohsE6msk2Wg/tg SYNw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:in-reply-to:references:from:date :message-id:subject:to:content-transfer-encoding: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=A8kUnNX2juHdW/P7fZmgsf2M0kf3AKtx2VXREedbzdA=; b=g8MIGvewDKzKuz9/YXWVlaJ7l7KjSBV+4YGnJUX1gYN/LmVY3+b9BPM0OkkqGXCXy+ VP4raykiycjumFsIgvDyKCvnzYuhZ+jJst9Nrivqk4Sz7SSHI86j+rzamvrUcZ52h+om ynTcNBUYkZxCGNHbx4oeiiWK5j4DLW5sxzlw83YtC1ubOQOw5IOXgMpiL0QZ60074F9g HYu0ibnOq3IlpPWhT+4OE/Eh931ChryAu1DYCVlFsCIfB2eVRPLmRDXO08Qd8fybJnaO tgudKj/eNjNYLy58g/GQHSS86tC7LT7sucEwfef4D8NtiKF3bigmSGtsvxQ5tzqTvp+I 4vr X-Gm-Message-State: AKaTC02AW0Vk+VI6zll+08G3Gro47Iz62gDJC43tie6vs89BtkUnozT0w76+NFeugqBRkg== X-Received: by 10.98.15.91 with SMTP id x88mr469087pfi.34.1481891339376; Fri, 16 Dec 2016 04:28:59 -0800 (PST) X-BeenThere: std-proposals@isocpp.org Original-Received: by 10.157.27.206 with SMTP id v14ls8143555otv.2.gmail; Fri, 16 Dec 2016 04:28:58 -0800 (PST) X-Received: by 10.176.0.169 with SMTP id 38mr2448570uaj.34.1481891338672; Fri, 16 Dec 2016 04:28:58 -0800 (PST) Original-Received: from mail-vk0-x22b.google.com (mail-vk0-x22b.google.com. [2607:f8b0:400c:c05::22b]) by mx.google.com with ESMTPS id 89si2141063uaq.198.2016.12.16.04.28.58 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Fri, 16 Dec 2016 04:28:58 -0800 (PST) Received-SPF: pass (google.com: domain of ville.voutilainen@gmail.com designates 2607:f8b0:400c:c05::22b as permitted sender) client-ip=2607:f8b0:400c:c05::22b; Original-Received: by mail-vk0-x22b.google.com with SMTP id p9so87798166vkd.3 for ; Fri, 16 Dec 2016 04:28:58 -0800 (PST) X-Received: by 10.31.81.198 with SMTP id f189mr868054vkb.160.1481891338326; Fri, 16 Dec 2016 04:28:58 -0800 (PST) Original-Received: by 10.103.50.74 with HTTP; Fri, 16 Dec 2016 04:28:57 -0800 (PST) In-Reply-To: X-Original-Sender: ville.voutilainen@gmail.com X-Original-Authentication-Results: mx.google.com; dkim=pass header.i=@gmail.com; spf=pass (google.com: domain of ville.voutilainen@gmail.com designates 2607:f8b0:400c:c05::22b as permitted sender) smtp.mailfrom=ville.voutilainen@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:29830 Archived-At: On 16 December 2016 at 14:26, Jonathan M=C3=BCller wrote: > On Dec 16, 2016 13:19, "Ville Voutilainen" > wrote: >> That doesn't provide the convenience we're looking for with these >> proposed wrappers. The best thing >> about them is that you can stash them into a struct and define no >> special member functions for that >> struct and you get the right semantics. Such a free function would >> need to be called manually, and >> it's not type-erasing and polymorphic, whereas the proposed indirect >> and cloned_ptr are. > > But I don't think you get the right semantics for that, that's my point. > You get inconsistent semantics. But I do, otherwise I wouldn't have chosen a cloned_ptr. > As a struct member I would rather have a non-null wrapper that gives valu= e > sematics to a polymorphic type. Like the proposed std::indirect? I got the impression that its latest feedback was to move it closer to value semantics of a polymorphic type. >Not a mix between optional and unique_ptr. All pointers are a mix between "optional" and something else since they can be null. And that's just fine for many cases. --=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. To view this discussion on the web visit https://groups.google.com/a/isocpp= ..org/d/msgid/std-proposals/CAFk2RUYq%2B_To254SGVAesMfZtFJDLSVmLvU%3DU3bhBq8= 3xZdA1w%40mail.gmail.com. .