220 31690 article Path: news.gmane.org!.POSTED!not-for-mail From: Ville Voutilainen Newsgroups: gmane.comp.lang.c++.isocpp.proposals Subject: Re: Simplify virtual inheritance rules Date: Sun, 19 Mar 2017 14:28:15 +0200 Lines: 18 Approved: news@gmane.org Message-ID: References: <6aa2e439-345e-4f04-8843-f38bb7b825b2@isocpp.org> <2340e1b0-09bd-4f5b-bf15-7605eaed858b@isocpp.org> <25e054ca-aac4-4bcc-805a-4e1357de4f37@isocpp.org> Reply-To: std-proposals@isocpp.org NNTP-Posting-Host: blaine.gmane.org Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8 X-Trace: blaine.gmane.org 1489926500 25392 195.159.176.226 (19 Mar 2017 12:28:20 GMT) X-Complaints-To: usenet@blaine.gmane.org NNTP-Posting-Date: Sun, 19 Mar 2017 12:28:20 +0000 (UTC) To: "ISO C++ Standard - Future Proposals" Original-X-From: std-proposals+bncBC5JHI7A7ALRBYHSXHDAKGQE7PMLYPQ@isocpp.org Sun Mar 19 13:28:15 2017 Return-path: Envelope-to: gclcip-std-proposals@m.gmane.org Original-Received: from mail-pf0-f200.google.com ([209.85.192.200]) by blaine.gmane.org with esmtp (Exim 4.84_2) (envelope-from ) id 1cpZwR-0005ny-G2 for gclcip-std-proposals@m.gmane.org; Sun, 19 Mar 2017 13:28:11 +0100 Original-Received: by mail-pf0-f200.google.com with SMTP id o126sf216025936pfb.2 for ; Sun, 19 Mar 2017 05:28:17 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=isocpp-org.20150623.gappssmtp.com; s=20150623; h=mime-version:in-reply-to:references:from:date:message-id:subject:to :x-original-sender:x-original-authentication-results:reply-to :precedence:mailing-list:list-id:x-spam-checked-in-group:list-post :list-help:list-archive:list-subscribe:list-unsubscribe; bh=03d21CjaCdIgMrDeiXogUYCbUeaG8mNLdon38v6Vxp8=; b=a2DD0A+lZ1tRWS2bZmudlsv3iiNOVtnYZmqLipqfjLU8avlKNgD0mo8iI1UCX4/gBE ipglfmVB4r0g+TdJzZiC/l0BhTCkyvk5CD/jLqdJT3XACGz2JmrlbVumawEfFGrp1CSK tNPv+2mxS7wKRC6HzNdTxun6fBv0mdJNo3g0bU3rwqanZbV61dWlKizpFqtTag0xwty5 gSdJyvSnshmc6Ny9N0q9/7d8NpvG2pR5+LlseKHDOcGwnCbAKeHf2aHByNIz/rEy93G3 41IIv7Lv6y4zLQUZQ6ZmA8UulqotKp+8zVqJ6hnjewH0vFbp4+FaYk83gk0Lbmv3bf3x FPqQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:in-reply-to:references:from:date :message-id:subject:to:x-original-sender :x-original-authentication-results:reply-to:precedence:mailing-list :list-id:x-spam-checked-in-group:list-post:list-help:list-archive :list-subscribe:list-unsubscribe; bh=03d21CjaCdIgMrDeiXogUYCbUeaG8mNLdon38v6Vxp8=; b=sPbTLWHbge5h4zhaPpotcWuXZAophuHdUwI/5mgTCwJwFAyUsdL67tJf/7S+9b1xxT STJzun0nRSw5p7btOzp626HIxsJ1oeOiJF6M5/uB2jUlqMFjXs6W64fCL7Y4dAwIg9TS 27RP/O3tU3EMMaFGBc8jyJxUmyp4jJVUflCu9Obj6bUdHpuZHyn5dQyvclk9xwckufEx xHISD83mQxLblJQZe9IXjy/Vb5lMfFU7YTO1+YQ7KNrkkATcwPYM2HULO+92K1tU93JX +f3JKKfCRJXDKoh0N4RG4xkpJHE0Clk8kMvooEZJvutvO/RTmKaRTvSjVJLfVLW9rS0i XqzQ== X-Gm-Message-State: AFeK/H33Z/0MQdqBShbUklrpjee8hncL3PX9yoprKNyVIaBXibKqm2678hAEcCLMEOlKng== X-Received: by 10.99.114.70 with SMTP id c6mr13052154pgn.17.1489926497251; Sun, 19 Mar 2017 05:28:17 -0700 (PDT) X-BeenThere: std-proposals@isocpp.org Original-Received: by 10.157.47.173 with SMTP id r42ls12039361otb.26.gmail; Sun, 19 Mar 2017 05:28:16 -0700 (PDT) X-Received: by 10.157.39.6 with SMTP id r6mr11832906ota.45.1489926496472; Sun, 19 Mar 2017 05:28:16 -0700 (PDT) Original-Received: from mail-oi0-x232.google.com (mail-oi0-x232.google.com. [2607:f8b0:4003:c06::232]) by mx.google.com with ESMTPS id v47si5692166ota.145.2017.03.19.05.28.16 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Sun, 19 Mar 2017 05:28:16 -0700 (PDT) Received-SPF: pass (google.com: domain of ville.voutilainen@gmail.com designates 2607:f8b0:4003:c06::232 as permitted sender) client-ip=2607:f8b0:4003:c06::232; Original-Received: by mail-oi0-x232.google.com with SMTP id w81so12155980oig.1 for ; Sun, 19 Mar 2017 05:28:16 -0700 (PDT) X-Received: by 10.202.179.132 with SMTP id c126mr3409511oif.64.1489926496134; Sun, 19 Mar 2017 05:28:16 -0700 (PDT) Original-Received: by 10.157.13.22 with HTTP; Sun, 19 Mar 2017 05:28:15 -0700 (PDT) In-Reply-To: <25e054ca-aac4-4bcc-805a-4e1357de4f37@isocpp.org> X-Original-Sender: ville.voutilainen@gmail.com X-Original-Authentication-Results: mx.google.com; dkim=pass header.i=@gmail.com; spf=pass (google.com: domain of ville.voutilainen@gmail.com designates 2607:f8b0:4003:c06::232 as permitted sender) smtp.mailfrom=ville.voutilainen@gmail.com; dmarc=pass (p=NONE sp=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:31690 Archived-At: On 19 March 2017 at 14:22, Denis Kotov wrote: > Thanks for comment T. C., > > But I do not agree that it is not worth to do it. > Consider situation of very long chain of inheritance. Why in this chain user > has to call every time constructor for VirtualBase ? The language statically guarantees that the initialization of the VirtualBase is performed. Your suggestion turns that static guarantee into undefined behavior. -- 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. To view this discussion on the web visit https://groups.google.com/a/isocpp.org/d/msgid/std-proposals/CAFk2RUZNBo6oE9M4uZbN97yCDHwsvj_zKN0qV8EAX%3DwmQTX9Xw%40mail.gmail.com. .