220 7921 article Path: news.gmane.org!not-for-mail From: Philipp Stephani Newsgroups: gmane.comp.lang.c++.isocpp.proposals Subject: Re: Limited inheritance for classes Date: Sat, 23 Nov 2013 17:00:22 +0100 Lines: 66 Approved: news@gmane.org Message-ID: References: Reply-To: std-proposals@isocpp.org NNTP-Posting-Host: plane.gmane.org Mime-Version: 1.0 Content-Type: multipart/alternative; boundary=001a11c3675e7032e804ebda3acf X-Trace: ger.gmane.org 1385222420 31692 80.91.229.3 (23 Nov 2013 16:00:20 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Sat, 23 Nov 2013 16:00:20 +0000 (UTC) To: std-proposals@isocpp.org Original-X-From: std-proposals+bncBD35NAXJW4GBBF5CYOKAKGQE6UGLVPQ@isocpp.org Sat Nov 23 17:00:26 2013 Return-path: Envelope-to: gclcip-std-proposals@m.gmane.org Original-Received: from mail-wg0-f71.google.com ([74.125.82.71]) by plane.gmane.org with esmtp (Exim 4.69) (envelope-from ) id 1VkFdB-00010p-1h for gclcip-std-proposals@m.gmane.org; Sat, 23 Nov 2013 17:00:25 +0100 Original-Received: by mail-wg0-f71.google.com with SMTP id b13sf3119937wgh.6 for ; Sat, 23 Nov 2013 08:00:24 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state: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:list-post:list-help:list-archive:list-subscribe :list-unsubscribe:content-type; bh=BSieqDOGUIo0dwoUipO2+Y31qhzRB4FKjm/PufvXADA=; b=eTOUeuQCaAjiahJhhrpBjIDnSQ1QJrRWwcC4eUGcYt60pdX9fZ0evFQhzIx0hBEgBZ W1fC8tJ30n5J0gI6MBWzKiBlIhSq1mCFIjw0Q1AHgYG+hawSOzFAv/iwBEF7BzQDT2Cg mUMm9xUQEST4mkRCIYkRfUjSClGZPl1xrdQZSP42qWwFPETxmswe3VHvu3aQJSnZ0KDM uTFcSjoX/VsQuD84efynpS0Zn9wrDbeHv0XFFfhFO5PkUQTBai8KmVMVT6gog91PcEu7 FOoQtBLuTjMSe9A6E4mYQzL4FPqLop2naCOe1vhiBFaiXGdFIb3OaL24OL0Si/yrjatT cRBg== X-Gm-Message-State: ALoCoQlS66FMXltb6/qMhhNN1aDY6T33o/DXE59Kd+JLDYSDC/WN3Ao3e4moMDttWEWldea2M5V3 X-Received: by 10.112.202.193 with SMTP id kk1mr6928179lbc.17.1385222424188; Sat, 23 Nov 2013 08:00:24 -0800 (PST) X-BeenThere: std-proposals@isocpp.org Original-Received: by 10.180.95.167 with SMTP id dl7ls60723wib.34.gmail; Sat, 23 Nov 2013 08:00:23 -0800 (PST) X-Received: by 10.204.127.135 with SMTP id g7mr2136164bks.42.1385222423230; Sat, 23 Nov 2013 08:00:23 -0800 (PST) Original-Received: from mail-la0-x233.google.com (mail-la0-x233.google.com [2a00:1450:4010:c03::233]) by mx.google.com with ESMTPS id rj10si1819773bkb.222.2013.11.23.08.00.23 for (version=TLSv1 cipher=ECDHE-RSA-RC4-SHA bits=128/128); Sat, 23 Nov 2013 08:00:23 -0800 (PST) Received-SPF: pass (google.com: domain of p.stephani2@gmail.com designates 2a00:1450:4010:c03::233 as permitted sender) client-ip=2a00:1450:4010:c03::233; Original-Received: by mail-la0-f51.google.com with SMTP id ec20so1806965lab.10 for ; Sat, 23 Nov 2013 08:00:22 -0800 (PST) X-Received: by 10.152.116.109 with SMTP id jv13mr1620050lab.30.1385222422670; Sat, 23 Nov 2013 08:00:22 -0800 (PST) Original-Received: by 10.112.9.203 with HTTP; Sat, 23 Nov 2013 08:00:22 -0800 (PST) In-Reply-To: X-Original-Sender: p.stephani2@gmail.com X-Original-Authentication-Results: mx.google.com; spf=pass (google.com: domain of p.stephani2@gmail.com designates 2a00:1450:4010:c03::233 as permitted sender) smtp.mail=p.stephani2@gmail.com; dkim=pass header.i=@gmail.com; dmarc=pass (p=NONE dis=NONE) header.from=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:7921 Archived-At: --001a11c3675e7032e804ebda3acf Content-Type: text/plain; charset=ISO-8859-1 2013/11/20 Dmitry Leontiev > //resides in some popular shared library > class A : private EventHandler { > A(){ > source1.RegisterEventHandler(this); > } > private: > void function(){printf("a");} > }; > //imlemented by a developer who is unaware of A internals > I think here lies the problem: All virtual functions are part of the public interface, independent of their visibility. That A overrides function is not an internal of A, but part of its interface, and authors of subclasses need to take it into account. -- --- 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/. --001a11c3675e7032e804ebda3acf Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable

= 2013/11/20 Dmitry Leontiev <dm.leontiev7@gmail.com>
=
//resides in some popular shared library
class A :=A0private EventHandler {
=A0=A0=A0 A(){
=A0=A0=A0 = =A0=A0 source1.RegisterEventHandler(this);
=A0=A0=A0 }
priva= te:
=A0=A0=A0=A0=A0 void function(){printf("a");}
};
//imlemented=A0by a developer who is unaware of A internals

I think here lies the problem= : All virtual functions are part of the public interface, independent of th= eir visibility. That A overrides function is not an internal of A, but part= of its interface, and authors of subclasses need to take it into account.= =A0

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