220 5155 article Path: news.gmane.org!not-for-mail From: Zhihao Yuan Newsgroups: gmane.comp.lang.c++.isocpp.proposals Subject: Re: Proposal: Calling Base class construct on inheritance declaration Date: Wed, 19 Jun 2013 23:44:33 -0400 Lines: 33 Approved: news@gmane.org Message-ID: References: <99414030-2563-46a3-a47b-dc43099dc74d@isocpp.org> <22276a15-fb98-4023-9258-449bc6f88010@isocpp.org> Reply-To: std-proposals@isocpp.org NNTP-Posting-Host: plane.gmane.org Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 X-Trace: ger.gmane.org 1371699875 23562 80.91.229.3 (20 Jun 2013 03:44:35 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Thu, 20 Jun 2013 03:44:35 +0000 (UTC) To: "std-proposals@isocpp.org" Original-X-From: std-proposals+bncBCUILMGRQMARBIXVRGHAKGQETQDNKMY@isocpp.org Thu Jun 20 05:44:36 2013 Return-path: Envelope-to: gclcip-std-proposals@m.gmane.org Original-Received: from mail-vc0-f198.google.com ([209.85.220.198]) by plane.gmane.org with esmtp (Exim 4.69) (envelope-from ) id 1UpVnX-0007ey-EC for gclcip-std-proposals@m.gmane.org; Thu, 20 Jun 2013 05:44:35 +0200 Original-Received: by mail-vc0-f198.google.com with SMTP id hf12sf8093123vcb.5 for ; Wed, 19 Jun 2013 20:44:34 -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=eod4P/TTaeRXnOxkdqgfncpLF/XmVjTgYI+GXSmVvq0=; b=DFs7Ilo6sUqMASJc4StmerGmv3byd2URHj9Dk2/dRSKjrvxIKxHTVGojfQdCdG1mk7 5kZDJ12nzkgNcskfv1jegZnOiWsGNkNnJcLi2KPea9OFh1L3NFEDWJlDP3H0nhKUXxOZ zIrdPfwOAeQtFVvAmvG2wVQ14pRZuAAq35SKrhUIpu5Sl1RXcv1US0hySRnlMNwfiKZT AWFoaf6IOmDg9oTK+2cjShkIeUSiQW2zKd6OwT08am5atlv3wp+WzMxe3oW0kPJqXxsc U8Ej/a6TDv1o8zFjTMAyESNl1qZwuJuQ/spGqPR2ViojfayFO5eeJl/8a6KHRHARgioQ eXrA== X-Received: by 10.236.32.229 with SMTP id o65mr3301917yha.19.1371699874557; Wed, 19 Jun 2013 20:44:34 -0700 (PDT) X-BeenThere: std-proposals@isocpp.org Original-Received: by 10.49.51.129 with SMTP id k1ls530165qeo.47.gmail; Wed, 19 Jun 2013 20:44:33 -0700 (PDT) X-Received: by 10.220.66.203 with SMTP id o11mr1764653vci.67.1371699873910; Wed, 19 Jun 2013 20:44:33 -0700 (PDT) Original-Received: from mail-vc0-f178.google.com (mail-vc0-f178.google.com [209.85.220.178]) by mx.google.com with ESMTPS id p8si7334374vdv.148.2013.06.19.20.44.33 for (version=TLSv1 cipher=ECDHE-RSA-RC4-SHA bits=128/128); Wed, 19 Jun 2013 20:44:33 -0700 (PDT) Received-SPF: pass (google.com: domain of lichray@gmail.com designates 209.85.220.178 as permitted sender) client-ip=209.85.220.178; Original-Received: by mail-vc0-f178.google.com with SMTP id m17so4375270vca.23 for ; Wed, 19 Jun 2013 20:44:33 -0700 (PDT) X-Received: by 10.220.112.16 with SMTP id u16mr1701172vcp.40.1371699873748; Wed, 19 Jun 2013 20:44:33 -0700 (PDT) Original-Received: by 10.220.69.147 with HTTP; Wed, 19 Jun 2013 20:44:33 -0700 (PDT) In-Reply-To: X-Original-Sender: lichray@gmail.com X-Original-Authentication-Results: mx.google.com; spf=pass (google.com: domain of lichray@gmail.com designates 209.85.220.178 as permitted sender) smtp.mail=lichray@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:5155 Archived-At: On Wed, Jun 19, 2013 at 11:31 PM, Richard Smith wrote: >> struct A : B { /*default initializer for B base class*/ } { /*class body*/ >> }; >> >> struct A : B { /*class body*/ }; >> >> I don't think there is a real ambiguity. > > It does not seem reasonable to require a compiler to look ahead over > an entire class body to detect the rare case where we actually have a > default initializer. Hmm, wait, it might be doable. class body is consist of statements, and initializer is consist of comma separated expressions. And a class declaration is not allowed to have an inheritance list. It should work. -- Zhihao Yuan, ID lichray The best way to predict the future is to invent it. ___________________________________________________ 4BSD -- http://4bsd.biz/ -- --- 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/. .