220 5130 <851b7fad-f929-44ea-a4c8-67d026d17db6@isocpp.org> article Path: news.gmane.org!not-for-mail From: Jonathan Wakely Newsgroups: gmane.comp.lang.c++.isocpp.proposals Subject: Re: Proposal: Calling Base class construct on inheritance declaration Date: Wed, 19 Jun 2013 14:15:50 -0700 (PDT) Lines: 85 Approved: news@gmane.org Message-ID: <851b7fad-f929-44ea-a4c8-67d026d17db6@isocpp.org> References: <99414030-2563-46a3-a47b-dc43099dc74d@isocpp.org> <74139a71-2628-485f-90fe-50597de3fdf5@isocpp.org> Reply-To: std-proposals@isocpp.org NNTP-Posting-Host: plane.gmane.org Mime-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_Part_3851_29945045.1371676550316" X-Trace: ger.gmane.org 1371676551 28871 80.91.229.3 (19 Jun 2013 21:15:51 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Wed, 19 Jun 2013 21:15:51 +0000 (UTC) To: std-proposals@isocpp.org Original-X-From: std-proposals+bncBCMONUNYS4IRBBV7RCHAKGQE5K3HGPA@isocpp.org Wed Jun 19 23:15:53 2013 Return-path: Envelope-to: gclcip-std-proposals@m.gmane.org Original-Received: from mail-yh0-f71.google.com ([209.85.213.71]) by plane.gmane.org with esmtp (Exim 4.69) (envelope-from ) id 1UpPjM-0006nY-A4 for gclcip-std-proposals@m.gmane.org; Wed, 19 Jun 2013 23:15:52 +0200 Original-Received: by mail-yh0-f71.google.com with SMTP id f73sf7856439yha.10 for ; Wed, 19 Jun 2013 14:15:51 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20120113; h=x-beenthere:date:from:to:message-id:in-reply-to:references:subject :mime-version:x-original-sender:reply-to:precedence:mailing-list :list-id:x-google-group-id:list-post:list-help:list-archive :list-subscribe:list-unsubscribe:content-type; bh=qlWBmsN9NBkXk4qboUdZOGsE5MeWR6oN5HcoMDM2y3s=; b=SZUqytrgJlV+tHVMSyBx1QY47N5Bs9yfPh4UIKuu1YeJNxazofH82/q3tTyoCY44Pz QOnlvS19tZUizOtN5EJH6059Z9d6jGpYyBTFu5vUhYwpYikqGOffJkzvAX+hea7JcCkY hP7X2Zb1wFi+BeqFa19pA5qwWT3SNGr8d7ZEFPqxpsyxpb03fvt8hWQJdpvUwX8GXq7D 6kmb7P+eUgnNDbFthqSHogTYon4+pZT8/qMQIAQ5W02JPtwA4y/YsG+N45IQe9t2/jKF U+VARzB6i09r7ppWUjfFWNWIqrS11RDSwQCLJkNiBDKgTnma1TtZ7SAjt1OxAUInHm3l fI7g== X-Received: by 10.236.110.168 with SMTP id u28mr2458148yhg.32.1371676551299; Wed, 19 Jun 2013 14:15:51 -0700 (PDT) X-BeenThere: std-proposals@isocpp.org Original-Received: by 10.49.52.40 with SMTP id q8ls469013qeo.1.gmail; Wed, 19 Jun 2013 14:15:50 -0700 (PDT) X-Received: by 10.49.116.132 with SMTP id jw4mr115718qeb.33.1371676550606; Wed, 19 Jun 2013 14:15:50 -0700 (PDT) In-Reply-To: <74139a71-2628-485f-90fe-50597de3fdf5@isocpp.org> 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:5130 Archived-At: ------=_Part_3851_29945045.1371676550316 Content-Type: text/plain; charset=ISO-8859-1 On Wednesday, June 19, 2013 10:12:55 PM UTC+1, Jonathan Wakely wrote: > > > How about a using directive at class scope, followed by a > brace-or-equal-init: > > class Derived { > using Base = "Derived"; > Derived() = default; > }; > > class Derived { > using Base{"Derived"}; > Derived() = default; > }; > > The brace-or-equal-init shouldn't clash with inheriting constructors or > using directives, right? > Oops, obviously I meant for Derived to actually be derived from Base: class Derived : Base { using Base{"Derived"}; Derived() = default; }; This would *not* allow Base("Derived"), as the original proposal used, because that isn't a brace-or-equal-init. It might be possible to allow it, but would be inconsistent with non-static data member initializers. -- --- 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/. ------=_Part_3851_29945045.1371676550316 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable
On Wednesday, June 19, 2013 10:12:55 PM UTC+1, Jonathan Wakely wrote:
How about a using direc= tive at class scope, followed by a brace-or-equal-init:

class Derived {
  using Base =3D "Derived";
<= div>  Derived() =3D default;
};

class Derived {
  using Base{"Derived"};
  Derived() =3D default;
};

<= div>The brace-or-equal-init shouldn't clash with inheriting constructors or= using directives, right?

Oops, obvio= usly I meant for Derived to actually be derived from Base:

class Derived : Base {
  using Base{"Deri= ved"};
  Derived() =3D default;
};

This would *not* allow Base("Derived"), as th= e original proposal used, because that isn't a brace-or-equal-init. It migh= t be possible to allow it, but would be inconsistent with non-static data m= ember initializers.

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