220 29839 <67a9e9ed-8748-4098-a43b-33598b516464@isocpp.org> article Path: news.gmane.org!.POSTED!not-for-mail From: Nicol Bolas Newsgroups: gmane.comp.lang.c++.isocpp.proposals Subject: Re: New smart pointer: CopyConstructible and CopyAssignable flavor of unique_ptr Date: Fri, 16 Dec 2016 07:46:27 -0800 (PST) Lines: 82 Approved: news@gmane.org Message-ID: <67a9e9ed-8748-4098-a43b-33598b516464@isocpp.org> 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_774_728247322.1481903188016" X-Trace: blaine.gmane.org 1481903196 3754 195.159.176.226 (16 Dec 2016 15:46:36 GMT) X-Complaints-To: usenet@blaine.gmane.org NNTP-Posting-Date: Fri, 16 Dec 2016 15:46:36 +0000 (UTC) To: ISO C++ Standard - Future Proposals Original-X-From: std-proposals+bncBCEKFTV6ZUMBBVEY2DBAKGQE6QZZX3Q@isocpp.org Fri Dec 16 16:46:28 2016 Return-path: Envelope-to: gclcip-std-proposals@m.gmane.org Original-Received: from mail-pf0-f198.google.com ([209.85.192.198]) by blaine.gmane.org with esmtp (Exim 4.84_2) (envelope-from ) id 1cHuiH-0007hw-13 for gclcip-std-proposals@m.gmane.org; Fri, 16 Dec 2016 16:46:25 +0100 Original-Received: by mail-pf0-f198.google.com with SMTP id y68sf126251591pfb.6 for ; Fri, 16 Dec 2016 07:46:29 -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=v9kVr6GOY13v0bAmnYTy2Kdq2oJIp6IvXU7a50l37/c=; b=rHRRtEgCOjiliU9j4Rhu8qQp6QH3FIJuZj0jVNxfBoSw/T+IxNMq+XC1EGebZXUnX6 +ULjTRqULJsYcFjoTTaMHJ/P29kKQ1nht64grCxzyF3Ku5H9SInmvsJU4qSQVIBskxfx hRNpJ5odOlwDYywp5gSNShwl75RcfGi3i6XMoiGiGhartAMneh9f1Hex46Pe3nDxxGSM lSnLqXQIliqNryqvjdKGlj0+pYoAdlqaiwZyorWSPrH27H9G3S5Ux4QilWC3RZCYbrWU jUszGhuPyK6RQt9i4NmfN6Qsy2VUBzaZ2LDjSneYfClZ/4irml1DN+BmyiH947o4CAkn 9dXg== DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; 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=v9kVr6GOY13v0bAmnYTy2Kdq2oJIp6IvXU7a50l37/c=; b=o8KqPYO8v1L8lL+di963MNm7/HUjxcyQQaYy2HuhyW1u6sdNkxt4b3mhPkInj27vYE UtDLmIMb551lKtTMyZqkb1tvj/+jB0KaDkzzn6tEOOlM1vrkSwW6yKM3FQYY8ah7lBR3 lZDwLXx6jnSSe7pwuCDQlyu4VPelTNmKAuE88WFvZJb2DHVAYq/Be9VUO7JPvhHpqEcp 9RM7wpPl73rrwiW+RDqQB26NOwD+gPAX7hHYWHE/b9mI+L/xaunsfxR5R9OXQWc0saVE bClS2cW28TMt2tn5QPPPDrYVi+VSZQZSOgHFEryfCGxBCWgurs6s/JaaDYIsa8Zr8oN4 3ZKQ== 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=v9kVr6GOY13v0bAmnYTy2Kdq2oJIp6IvXU7a50l37/c=; b=IxRTiVK+6IITc8P4WriI/Jn551fGAeWthXJV/FVTb90WhaVmx1w8a1MvB6pLrunBjl iPZHDrgDzv0U7CaA+xVG8xO28s9jhUMx/pTACtXXGo0Gnk3aeYKiHl7W5cXsA3VL+0lR d66iehcXAznNAe+Te3HySEzfQ6P6toFfalDFUeSDE1MLF5ppUuY6eXna6TqhiBfM1ItX 1fYyPUQRK68tQRlNBH799puiBr3zzw1IgvORYfuDeZ2hMCKR0qzcC7L99z3vHu9TQ8iX Mmsm78fq4syzb2eIwQ2/krQcEESYloffUuyBYX64MFWHShLY+bGgX2UfN4srrQJkiqfS rzgQ== X-Gm-Message-State: AKaTC02etoXkVGTDbHm0XHV9oF9oT/NL2lmtXxvn5yie92u+/jLHQ4hnwC2UjbXYfloHrQ== X-Received: by 10.99.121.132 with SMTP id u126mr1826078pgc.1.1481903189083; Fri, 16 Dec 2016 07:46:29 -0800 (PST) X-BeenThere: std-proposals@isocpp.org Original-Received: by 10.157.17.166 with SMTP id v35ls8936779otf.0.gmail; Fri, 16 Dec 2016 07:46:28 -0800 (PST) X-Received: by 10.157.37.247 with SMTP id q110mr185610ota.5.1481903188454; Fri, 16 Dec 2016 07:46:28 -0800 (PST) In-Reply-To: X-Original-Sender: jmckesson@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:29839 Archived-At: ------=_Part_774_728247322.1481903188016 Content-Type: multipart/alternative; boundary="----=_Part_775_1532963622.1481903188017" ------=_Part_775_1532963622.1481903188017 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable On Friday, December 16, 2016 at 6:58:40 AM UTC-5, Jonathan Wakely wrote: > > 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. > I really think this needs to be emphasized. Cheap-move+deep-copy are hardly= =20 an uncommon set of semantics in C++. Every standard library container uses= =20 these semantics. The only question is how deep the copy goes: whether you're creating a `T`= =20 itself or some class derived from `T`. --=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/67a9e9ed-8748-4098-a43b-33598b516464%40isocpp.or= g. ------=_Part_775_1532963622.1481903188017 Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: quoted-printable
On Friday, December 16, 2016 at 6:58:40 AM UTC-5, Jonathan= Wakely wrote:
On Friday, 16 December 2016 11:44:40 UTC, Jonathan M=C3=BCller wrote:

So it transfers ownershi= p 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.

I r= eally think this needs to be emphasized. Cheap-move+deep-copy are hardly an= uncommon set of semantics in C++. Every standard library container uses th= ese semantics.

The only question is how deep the copy goes: whether = you're creating a `T` itself or some class derived from `T`.
<= /div>

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To view this discussion on the web visit https://groups.google.= com/a/isocpp.org/d/msgid/std-proposals/67a9e9ed-8748-4098-a43b-33598b516464= %40isocpp.org.
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