220 5220 article Path: news.gmane.org!not-for-mail From: Ville Voutilainen Newsgroups: gmane.comp.lang.c++.isocpp.proposals Subject: Re: Re: Teachability problems with std::move Date: Tue, 25 Jun 2013 21:14:37 +0300 Lines: 72 Approved: news@gmane.org Message-ID: References: <73cad38f-c1b6-4ce3-bfc1-e4a660dbb638@isocpp.org> Reply-To: std-proposals@isocpp.org NNTP-Posting-Host: plane.gmane.org Mime-Version: 1.0 Content-Type: multipart/alternative; boundary=20cf306844d580a1e604dffe807d X-Trace: ger.gmane.org 1372184078 25893 80.91.229.3 (25 Jun 2013 18:14:38 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Tue, 25 Jun 2013 18:14:38 +0000 (UTC) To: std-proposals@isocpp.org Original-X-From: std-proposals+bncBC5JHI7A7ALRBDN4U6HAKGQEHSAEOPI@isocpp.org Tue Jun 25 20:14:39 2013 Return-path: Envelope-to: gclcip-std-proposals@m.gmane.org Original-Received: from mail-vb0-f70.google.com ([209.85.212.70]) by plane.gmane.org with esmtp (Exim 4.69) (envelope-from ) id 1UrXlH-0008T5-69 for gclcip-std-proposals@m.gmane.org; Tue, 25 Jun 2013 20:14:39 +0200 Original-Received: by mail-vb0-f70.google.com with SMTP id q12sf17072514vbe.1 for ; Tue, 25 Jun 2013 11:14:38 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=x-beenthere:mime-version:in-reply-to:references:date:message-id :subject:from:to:x-original-sender:x-original-authentication-results :reply-to:precedence:mailing-list:list-id:x-google-group-id :list-post:list-help:list-archive:list-subscribe:list-unsubscribe :content-type; bh=t9qNsvtUitrq0U3Woc7b2Bzn4EIrcSp/vW486W3Qzfk=; b=kpsk4Q9HVcUi262Pai3yfDez4F8UR58LIBjHOtBRlBLewLVeBTlFcYqJfLUSazJaaG UPqFSNm2mVHUL9wP3Riek9l7tGmcvHXiqsXzBCbbcl4LXJjQcTCXQMGBUMLvO4cvise5 lJPTcDr3QJpj2xesl27gpmxOOgriy9pKspvgoh9FJk4B6Ss5X4XlxAW1dIn8zeuiuUXn dNb7uXyXgip5HQ7zSqQhjMvCFW0FAspIlybf9gSwRC+V8vFAE7CGJ+f90XtuWBdMjvCq SzJEa10oCVPhu3jrhUGcc9OmAPrVdDFDDhsZvzxNcqGrPTdqsnJBJSpKUN+v0Kqsicks mFxg== X-Received: by 10.236.20.83 with SMTP id o59mr97979yho.28.1372184078347; Tue, 25 Jun 2013 11:14:38 -0700 (PDT) X-BeenThere: std-proposals@isocpp.org Original-Received: by 10.49.94.212 with SMTP id de20ls112212qeb.44.gmail; Tue, 25 Jun 2013 11:14:37 -0700 (PDT) X-Received: by 10.229.164.19 with SMTP id c19mr98751qcy.3.1372184077571; Tue, 25 Jun 2013 11:14:37 -0700 (PDT) Original-Received: from mail-qe0-x232.google.com (mail-qe0-x232.google.com [2607:f8b0:400d:c02::232]) by mx.google.com with ESMTPS id dt7si11017803qeb.80.2013.06.25.11.14.37 for (version=TLSv1 cipher=ECDHE-RSA-RC4-SHA bits=128/128); Tue, 25 Jun 2013 11:14:37 -0700 (PDT) Received-SPF: pass (google.com: domain of ville.voutilainen@gmail.com designates 2607:f8b0:400d:c02::232 as permitted sender) client-ip=2607:f8b0:400d:c02::232; Original-Received: by mail-qe0-f50.google.com with SMTP id f6so679432qej.9 for ; Tue, 25 Jun 2013 11:14:37 -0700 (PDT) X-Received: by 10.224.105.199 with SMTP id u7mr1227386qao.33.1372184077439; Tue, 25 Jun 2013 11:14:37 -0700 (PDT) Original-Received: by 10.224.174.143 with HTTP; Tue, 25 Jun 2013 11:14:37 -0700 (PDT) In-Reply-To: <73cad38f-c1b6-4ce3-bfc1-e4a660dbb638@isocpp.org> X-Original-Sender: ville.voutilainen@gmail.com X-Original-Authentication-Results: mx.google.com; spf=pass (google.com: domain of ville.voutilainen@gmail.com designates 2607:f8b0:400d:c02::232 as permitted sender) smtp.mail=ville.voutilainen@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:5220 Archived-At: --20cf306844d580a1e604dffe807d Content-Type: text/plain; charset=ISO-8859-1 On 25 June 2013 21:01, Mikhail Semenov wrote: > You don't actually need the static_cast here. The following will do: > > *std::unique_ptr FooFactory() {* > >> * std::unique_ptr result(new Foo);* >> * // ...* >> * return result;* >> *}* >> >> >> >> Except that it won't for cases where the factory wants to modify the Foo stored inside the unique_ptr before ultimately returning it as a unique_ptr to const Foo. -- --- 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/. --20cf306844d580a1e604dffe807d Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable



On 25 June 2013 21:01, Mikhail Semenov <mikhailsemenov1= 957@gmail.com> wrote:
You don't actually need the static_= cast here. The following will do:

std::u= nique_ptr<const Foo> FooFactory() {
=A0 std::unique_ptr<const Foo> re= sult(new Foo);
=A0 // ...
=A0 return result;
}
=A0



Except that it won't for cases where the factory want= s to modify the Foo stored inside the unique_ptr
before ultimately returning it as a unique_ptr to const Foo.

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