220 6862 article Path: news.gmane.org!not-for-mail From: Nevin Liber Newsgroups: gmane.comp.lang.c++.isocpp.proposals Subject: Re: Proposal: Class Frames to inject prefabricated features into classes Date: Tue, 1 Oct 2013 16:25:26 -0500 Lines: 76 Approved: news@gmane.org Message-ID: References: <27c90f45-8ae6-44c1-8755-2b4cece26bcb@isocpp.org> Reply-To: std-proposals@isocpp.org NNTP-Posting-Host: plane.gmane.org Mime-Version: 1.0 Content-Type: multipart/alternative; boundary=001a11c2ddb8c590f604e7b49941 X-Trace: ger.gmane.org 1380662765 20815 80.91.229.3 (1 Oct 2013 21:26:05 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Tue, 1 Oct 2013 21:26:05 +0000 (UTC) To: "std-proposals@isocpp.org" Original-X-From: std-proposals+bncBCE35H5S6IDBB373VSJAKGQEMFYKIPI@isocpp.org Tue Oct 01 23:26:09 2013 Return-path: Envelope-to: gclcip-std-proposals@m.gmane.org Original-Received: from mail-qc0-f199.google.com ([209.85.216.199]) by plane.gmane.org with esmtp (Exim 4.69) (envelope-from ) id 1VR7SK-0007eV-UV for gclcip-std-proposals@m.gmane.org; Tue, 01 Oct 2013 23:26:09 +0200 Original-Received: by mail-qc0-f199.google.com with SMTP id u18sf8718686qcx.2 for ; Tue, 01 Oct 2013 14:26:08 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=mime-version:sender:in-reply-to:references:from:date:message-id :subject:to:x-original-sender:x-original-authentication-results :reply-to:precedence:mailing-list:list-id:list-post:list-help :list-archive:list-subscribe:list-unsubscribe:content-type; bh=HgexKKCAWhW3r+I60cuuBp8TUQY7iJ3fw+/OTerqhzY=; b=V/eTs8uiISQiVVQQJlc97Y0AdDrFeSg1LKnRAcaZnhslwBf+kHUhY2wAU41Co0QQql X50fwf3Fo89yWqmYN5KMTUgXAUKvHiEZ6+zmI0gUjzmZBwghA0PdwBHp/VcDvnYH7W6/ of/GYBWBt58d8FDRhtXsbjjEsYWhG5u8aTF/APmCiYj1Q95sFTbkGBWyFGOFtuOynsV6 D1z/rQhJP6bXieAyPJFaUymCoFO86/Ct9xxahMs9Wu398BmGuFUTksDI23gpCnPAEyn1 RxqhAKSL5JXuACxHBQYz3Ve0QQzDF7dIfx+714rmsO9rjTVrEb59lFVcVGZqI/fspCPS sxBg== X-Received: by 10.236.220.39 with SMTP id n37mr10214370yhp.15.1380662768070; Tue, 01 Oct 2013 14:26:08 -0700 (PDT) X-BeenThere: std-proposals@isocpp.org Original-Received: by 10.49.109.226 with SMTP id hv2ls250652qeb.22.gmail; Tue, 01 Oct 2013 14:26:07 -0700 (PDT) X-Received: by 10.49.127.179 with SMTP id nh19mr37864679qeb.1.1380662767179; Tue, 01 Oct 2013 14:26:07 -0700 (PDT) Original-Received: from mail-qe0-x233.google.com (mail-qe0-x233.google.com [2607:f8b0:400d:c02::233]) by mx.google.com with ESMTPS id kz6si3493968qeb.108.1969.12.31.16.00.00 (version=TLSv1 cipher=ECDHE-RSA-RC4-SHA bits=128/128); Tue, 01 Oct 2013 14:26:06 -0700 (PDT) Received-SPF: pass (google.com: domain of nliber@gmail.com designates 2607:f8b0:400d:c02::233 as permitted sender) client-ip=2607:f8b0:400d:c02::233; Original-Received: by mail-qe0-f51.google.com with SMTP id ne12so5515385qeb.10 for ; Tue, 01 Oct 2013 14:26:06 -0700 (PDT) X-Received: by 10.224.127.6 with SMTP id e6mr23965057qas.67.1380662766831; Tue, 01 Oct 2013 14:26:06 -0700 (PDT) Original-Sender: nliber@gmail.com Original-Received: by 10.49.60.70 with HTTP; Tue, 1 Oct 2013 14:25:26 -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 2607:f8b0:400d:c02::233 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:6862 Archived-At: --001a11c2ddb8c590f604e7b49941 Content-Type: text/plain; charset=ISO-8859-1 On 1 October 2013 15:53, Billy O'Neal wrote: > How is this different than what you can already do with the existing: > > template > class MoveInjection > { > T& operator=(T&&) { /*...*/ } > } > > class Client : public MoveInjection > { > > } > You cannot inject assignment operators / constructors via CRTP. The way I think about it is that the compiler generates new assignment operators for the derived classes which hide any declared in the base class. That being said, I don't think that is worth a whole language feature. -- --- 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/. --001a11c2ddb8c590f604e7b49941 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable
On 1 October 2013 15:53, Billy O'Neal <billy.onea= l@gmail.com> wrote:
How is this different = than what you can already do with the existing:
=A0
tem= plate <typename T>
class MoveInjection
{
=A0=A0=A0 T&=A0operator= =3D(T&&) { /*...*/ }
}
=A0
class Client : public MoveInjection<Clien= t>
{
=A0
}
You cannot inject assignment operators / constructors via CRTP= .. =A0The way I think about it is that the compiler generates new assignment= operators for the derived classes which hide any declared in the base clas= s.

That being said, I don't think that is worth a whol= e language feature.

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