220 29821 article Path: news.gmane.org!.POSTED!not-for-mail From: Jonathan Wakely Newsgroups: gmane.comp.lang.c++.isocpp.proposals Subject: Re: New smart pointer: CopyConstructible and CopyAssignable flavor of unique_ptr Date: Fri, 16 Dec 2016 03:58:40 -0800 (PST) Lines: 72 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: multipart/mixed; boundary="----=_Part_419_239395026.1481889520061" X-Trace: blaine.gmane.org 1481889522 26821 195.159.176.226 (16 Dec 2016 11:58:42 GMT) X-Complaints-To: usenet@blaine.gmane.org NNTP-Posting-Date: Fri, 16 Dec 2016 11:58:42 +0000 (UTC) To: ISO C++ Standard - Future Proposals Original-X-From: std-proposals+bncBCMONUNYS4IRB4FNZ7BAKGQE2VULZGQ@isocpp.org Fri Dec 16 12:58:38 2016 Return-path: Envelope-to: gclcip-std-proposals@m.gmane.org Original-Received: from mail-qk0-f200.google.com ([209.85.220.200]) by blaine.gmane.org with esmtp (Exim 4.84_2) (envelope-from ) id 1cHr9o-00067d-TK for gclcip-std-proposals@m.gmane.org; Fri, 16 Dec 2016 12:58:37 +0100 Original-Received: by mail-qk0-f200.google.com with SMTP id m67sf62563419qkf.0 for ; Fri, 16 Dec 2016 03:58:41 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=isocpp-org.20150623.gappssmtp.com; s=20150623; h=date:from:to:message-id:in-reply-to:references:subject:mime-version :x-original-sender:reply-to:precedence:mailing-list:list-id :x-spam-checked-in-group:list-post:list-help:list-archive :list-subscribe:list-unsubscribe; bh=KZm8mKvMbg/qK3A51CeGVjIVB90bMAHdngtsmNpZF7A=; b=ZidnGPrQnFiCg3ksgRbcOHdw1F6b8RZKa6YfXixBhvU/Ppf9BqwXjI7nIN7DZs4UZD wFPP9hLg+K+wFH2AFxvnk5eFan0Ael8i79q6YfewzielsPmJgDdzXIs+JyEAuAkkP1pn go3Aq0vtf8RzADYyKWF8a+e/2Mdh+1q3Q7meR+pJYwKsejmL65g7CPZohztQeKDhOVQe xtxZmogIUuU+7XpxCritiIFDKjV7l+2Ov/UKyQMy2LjcbI0pbq/+3wuk6CcGkRd3ngru 2LxbyHNLUj4ET6bFJZlWn5eU+0f+JIA4gWNqPf3AuuhmGqWwh9xX69oSM5T/F3fEltbP 6YKg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:from:to:message-id:in-reply-to:references :subject:mime-version:x-original-sender:reply-to:precedence :mailing-list:list-id:x-spam-checked-in-group:list-post:list-help :list-archive:list-subscribe:list-unsubscribe; bh=KZm8mKvMbg/qK3A51CeGVjIVB90bMAHdngtsmNpZF7A=; b=R44G9ntel9INXV7FkYjqXiG1kyyE09VTYK4gI6ES8s4hexKp8CG2HGSeImtbuBMci0 L1nKb0wca0RQFI3iepPJ0FODVu5HGY1Rbbw0K+OEEAyjhH3o3KKVZpsSUJLcX97lU6Ir nh3NFYw9RAXgr78xxWNYeXuat2visNkxjN40CV4rpJr9lrAWrX5zRzp3SDdW71bVgT3f yPdYrT4m4b+vSlegRZAMV/0PqzHEV1zYsnOQiH2WGzi13m5B63HPlgjV0DUZS00D+4R1 aobeL3fT1f9b86eXRhAtaGu54015FYRuRF0K97NBoqmBqAYySTFHp/XPDnC1ncLnmaM1 kRqw== X-Gm-Message-State: AIkVDXIkJBLN8SPJRKMTucRV21dr8VHIkkm2KA+wDUd5VW3ecr+vcpavISTM3ljDDkvm+w== X-Received: by 10.200.54.194 with SMTP id b2mr497644qtc.35.1481889521214; Fri, 16 Dec 2016 03:58:41 -0800 (PST) X-BeenThere: std-proposals@isocpp.org Original-Received: by 10.157.23.193 with SMTP id j59ls8463606otj.24.gmail; Fri, 16 Dec 2016 03:58:40 -0800 (PST) X-Received: by 10.157.37.125 with SMTP id j58mr92333otd.18.1481889520429; Fri, 16 Dec 2016 03:58:40 -0800 (PST) In-Reply-To: X-Original-Sender: cxx@kayari.org 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:29821 Archived-At: ------=_Part_419_239395026.1481889520061 Content-Type: multipart/alternative; boundary="----=_Part_420_2068846563.1481889520061" ------=_Part_420_2068846563.1481889520061 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable On Friday, 16 December 2016 11:44:40 UTC, Jonathan M=C3=BCller wrote: > > So it transfers ownership when moving and does a deep copy when copying? > > I don't think two so different semantics are a great idea. > > > That seems to work for std::vector, and many other types. The difference here would be that the dynamic type can vary from the static= =20 type, but I don't see why that means that "move when you can move and copy= =20 otherwise" stops being a sensible policy. --=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/e1e780b7-34ea-41bf-9aba-22a1eb6a5f3f%40isocpp.or= g. ------=_Part_420_2068846563.1481889520061 Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: quoted-printable

On Friday, 16 December 2016 11:44:40 UTC, Jonathan M= =C3=BCller wrote:

So it transfers ownership when moving and does a deep copy when copying?=

I don't think two so different semantics are a great ide= a.



That seems to work = for std::vector, and many other types.

The differe= nce here would be that the dynamic type can vary from the static type, but = I don't see why that means that "move when you can move and copy o= therwise" stops being a sensible policy.

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