220 16065 <1696280.25OUg0jlQd@tjmaciei-mobl4> article Path: news.gmane.org!not-for-mail From: Thiago Macieira Newsgroups: gmane.comp.lang.c++.isocpp.proposals Subject: Re: const T* operator->() const Date: Fri, 06 Feb 2015 08:42:52 -0800 Lines: 32 Approved: news@gmane.org Message-ID: <1696280.25OUg0jlQd@tjmaciei-mobl4> References: <56a7727d-9839-45c9-be72-a6ecb61f38c9@isocpp.org> <1932997.CYfMEhPeyI@tjmaciei-mobl4> Reply-To: std-proposals@isocpp.org NNTP-Posting-Host: plane.gmane.org Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8 X-Trace: ger.gmane.org 1423240987 26318 80.91.229.3 (6 Feb 2015 16:43:07 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Fri, 6 Feb 2015 16:43:07 +0000 (UTC) To: std-proposals@isocpp.org Original-X-From: std-proposals+bncBCB4TK757YBRBFO62OTAKGQEE36WZVA@isocpp.org Fri Feb 06 17:43:05 2015 Return-path: Envelope-to: gclcip-std-proposals@m.gmane.org Original-Received: from mail-wg0-f69.google.com ([74.125.82.69]) by plane.gmane.org with esmtp (Exim 4.69) (envelope-from ) id 1YJlzj-0001OR-9W for gclcip-std-proposals@m.gmane.org; Fri, 06 Feb 2015 17:43:03 +0100 Original-Received: by mail-wg0-f69.google.com with SMTP id x12sf11473040wgg.0 for ; Fri, 06 Feb 2015 08:43:02 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:from:to:subject:date:message-id:user-agent :in-reply-to:references:mime-version:content-type:x-original-sender :x-original-authentication-results:reply-to:precedence:mailing-list :list-id:list-post:list-help:list-archive:list-subscribe :list-unsubscribe; bh=iZv1fD5PplEgUuoNXw0bFzKOaSMLh8fL2V9JwvFmopY=; b=bJdwxUJl3eZxjaAw9pcrQgYA0vTyfC7x3YCJYFGtVpNrHhPCnKH/tfZE4ejHKxkqL1 9icMo1nHz8BPGJykf4++eHwIcq3g+PSfn3nu4w8y/COEjREmCD4Ky/JMJ+rKKXSQEXLa +9hy9PJoIdACA1rLPp2i1p8XM/QNPoKGNYi9QmZ3ILO5PjXm1UVJYCwnX4D43McBAtD7 mm6bV0IMQ3Y5g1G4IlZ8QT2IEikvN/xHUeOOOZfZ8ktIdWZrz6JjEMMvHlsaObcFMbGa CzF+0BH1mJUbgsyjEyo/DCPlc0d3Mr3b7ONCfSCtipStBrpaGPs3kOwG6sFnEdNClb6e dvFw== X-Gm-Message-State: ALoCoQlZcUVEjHdTG3zbvs5IE1nn2NSNq/eZjMYDtWYBZkdN+8yRx7NMqZA24GXKUxzo7y8MRclr X-Received: by 10.152.219.136 with SMTP id po8mr592980lac.4.1423240982699; Fri, 06 Feb 2015 08:43:02 -0800 (PST) X-BeenThere: std-proposals@isocpp.org Original-Received: by 10.180.211.230 with SMTP id nf6ls166947wic.20.gmail; Fri, 06 Feb 2015 08:43:01 -0800 (PST) X-Received: by 10.194.205.138 with SMTP id lg10mr8976452wjc.130.1423240981338; Fri, 06 Feb 2015 08:43:01 -0800 (PST) Original-Received: from gondolin.macieira.info (gondolin.macieira.info. [2a01:4f8:d13:f81:21c:14ff:fe01:12a3]) by mx.google.com with ESMTP id g6si5006321wjx.143.2015.02.06.08.43.00 for ; Fri, 06 Feb 2015 08:43:00 -0800 (PST) Received-SPF: pass (google.com: domain of thiago@macieira.org designates 2a01:4f8:d13:f81:21c:14ff:fe01:12a3 as permitted sender) client-ip=2a01:4f8:d13:f81:21c:14ff:fe01:12a3; Original-Received: from tjmaciei-mobl4.localnet (unknown [IPv6:2601:7:1c80:5d2:5e51:4fff:fe7c:49f8]) by gondolin.macieira.info (Postfix) with ESMTPSA id 7954B11A71A for ; Fri, 6 Feb 2015 08:42:59 -0800 (PST) User-Agent: KMail/4.14.4 (Linux/3.11.10-25-desktop; KDE/4.14.4; x86_64; ; ) In-Reply-To: X-Original-Sender: thiago@macieira.org X-Original-Authentication-Results: mx.google.com; spf=pass (google.com: domain of thiago@macieira.org designates 2a01:4f8:d13:f81:21c:14ff:fe01:12a3 as permitted sender) smtp.mail=thiago@macieira.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:16065 Archived-At: On Friday 06 February 2015 10:50:43 mobi phil wrote: > > For example, the expression > > > > type->member > > > > Is an lvalue and could be assigned to. But that doesn't mean that it is > > assigned to, so the operator-> would have no choice but to copy and assume > > that you do. > > well, if you are directly accessing members, you would compromise the > implementation of COW, wouldn't you? How is accessing a member different from calling a member function? Either the inner object knows it's under COW or it does. If it does, then the operator-> is irrelevant. The member functions implement the COW. -- Thiago Macieira - thiago (AT) macieira.info - thiago (AT) kde.org Software Architect - Intel Open Source Technology Center PGP/GPG: 0x6EF45358; fingerprint: E067 918B B660 DBD1 105C 966C 33F5 F005 6EF4 5358 -- --- 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/. .