220 25318 <56F043E5.7010505@wanadoo.fr> article Path: news.gmane.org!not-for-mail From: "Vicente J. Botet Escriba" Newsgroups: gmane.comp.lang.c++.isocpp.proposals Subject: Re: Re: [RFC] Call for considering "the big picture" re: tuples and parameter packs Date: Mon, 21 Mar 2016 19:56:37 +0100 Lines: 42 Approved: news@gmane.org Message-ID: <56F043E5.7010505@wanadoo.fr> References: <1FCE896E-001A-4F56-8866-FB201ABF3391@gmx.de> <6605C1A6-7DB7-4CDF-9B36-BEE95D90CAED@gmx.de> <56EF33D4.5070509@wanadoo.fr> <20160321032111.4898897.41547.8488@gmail.com> Reply-To: std-proposals@isocpp.org NNTP-Posting-Host: plane.gmane.org Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: quoted-printable X-Trace: ger.gmane.org 1458586609 2957 80.91.229.3 (21 Mar 2016 18:56:49 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Mon, 21 Mar 2016 18:56:49 +0000 (UTC) To: std-proposals@isocpp.org Original-X-From: std-proposals+bncBDH67CONY4PBBZUHYG3QKGQEWFCNGYY@isocpp.org Mon Mar 21 19:56:40 2016 Return-path: Envelope-to: gclcip-std-proposals@m.gmane.org Original-Received: from mail-wm0-f71.google.com ([74.125.82.71]) by plane.gmane.org with esmtp (Exim 4.69) (envelope-from ) id 1ai50K-0004dv-52 for gclcip-std-proposals@m.gmane.org; Mon, 21 Mar 2016 19:56:40 +0100 Original-Received: by mail-wm0-f71.google.com with SMTP id l68sf35898385wml.1 for ; Mon, 21 Mar 2016 11:56:39 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=isocpp-org.20150623.gappssmtp.com; s=20150623; h=subject:to:references:from:message-id:date:user-agent:mime-version :in-reply-to:content-transfer-encoding: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=U4lU6tzv9qf8GayjFmOrQjj2FgX6UddoIhlxjRQIQo8=; b=zqHIAz7yJ0Jdpz7MVU+5UjeXkrCgR215GiPBluOdyBJtQx2VkqXRRyTLtTQCQNkfNW UgHdj4+yYybaJuxpg2XPynL4l3Gogg1cm93YQ+vAXCjtuiXZPSc2A/6IlP2VuvfwmEWb fykL8l1nGq3K0eKEKwTQkc98uk4IPyxbHiW87V5QO7s8EBZAnXBLogkVCffj+OZ05VGV HUaiadyFnbBbMSxj1ExRS0G+WdRq+JER7GS7uNs4NBqZ9iEQjhDwzd3SCAqZpNUyF4nz XESkc9qFQ4OiJ699rTq64qlKrr66DBIV3LUIMPfx9+rdH1+on7FItUVag5nUVffZtsr0 X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:subject:to:references:from:message-id:date :user-agent:mime-version:in-reply-to:content-transfer-encoding :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=U4lU6tzv9qf8GayjFmOrQjj2FgX6UddoIhlxjRQIQo8=; b=IFXf2NN2tREE7LCxoVX6YJFyl/KFJHTheFMH2abWcVJlwVn2aBw3HRe6fcRee3bfRr I1JrGGq7Tpx11ytTVqmVjzXnxPXyk5+HCLWRw8XhMvKt3EPwfd5KtpcCT8R5VsHLPFF/ vdPLO/HSwAnqYZr2gmaGW+PuOqUsOgFxGyDUgRPE5IAwuPqbHwDhbfo6P577K2V0eWTB jyuE2nhpBb3y8Q0PEOW6PwOnP6AcPlH3NrCpfetkZiOVG2IsLPFGxSkgZD6mNRd7Jy4s JUM6tjzD19QoWXNqPOEeepJs2kK5w5CcSG8/t8kyAGu1jhv4J1wcC1r+ubFw/dskkGWu X-Gm-Message-State: AD7BkJIqZHXyS1D8ykX5BYOFRitAwKKKVJUYruYTcE9bP98Y/9jFUlK2Rm/9mIfZDhMiRA== X-Received: by 10.25.31.81 with SMTP id f78mr3949601lff.7.1458586599563; Mon, 21 Mar 2016 11:56:39 -0700 (PDT) X-BeenThere: std-proposals@isocpp.org Original-Received: by 10.28.98.194 with SMTP id w185ls689457wmb.0.gmail; Mon, 21 Mar 2016 11:56:38 -0700 (PDT) X-Received: by 10.28.21.75 with SMTP id 72mr14942817wmv.64.1458586598396; Mon, 21 Mar 2016 11:56:38 -0700 (PDT) Original-Received: from smtp.smtpout.orange.fr (smtp02.smtpout.orange.fr. [80.12.242.124]) by mx.google.com with ESMTPS id em4si33022797wjd.240.2016.03.21.11.56.38 for (version=TLS1 cipher=AES128-SHA bits=128/128); Mon, 21 Mar 2016 11:56:38 -0700 (PDT) Received-SPF: neutral (google.com: 80.12.242.124 is neither permitted nor denied by best guess record for domain of vicente.botet@wanadoo.fr) client-ip=80.12.242.124; Original-Received: from new-host.home ([92.139.140.101]) by mwinf5d25 with ME id Yiwd1s00Q2BTYes03iwdt1; Mon, 21 Mar 2016 19:56:38 +0100 X-ME-Helo: new-host.home X-ME-Auth: dmljZW50ZS5ib3RldEB3YW5hZG9vLmZy X-ME-Date: Mon, 21 Mar 2016 19:56:38 +0100 X-ME-IP: 92.139.140.101 User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.11; rv:38.0) Gecko/20100101 Thunderbird/38.7.0 In-Reply-To: <20160321032111.4898897.41547.8488@gmail.com> X-Original-Sender: vicente.botet@wanadoo.fr X-Original-Authentication-Results: mx.google.com; spf=neutral (google.com: 80.12.242.124 is neither permitted nor denied by best guess record for domain of vicente.botet@wanadoo.fr) smtp.mailfrom=vicente.botet@wanadoo.fr Precedence: list Mailing-list: list std-proposals@isocpp.org; contact std-proposals+owners@isocpp.org List-ID: X-Spam-Checked-In-Group: std-proposals@isocpp.org 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:25318 Archived-At: Le 21/03/2016 04:21, Tony V E a =C3=A9crit : > Could the member access syntax actually be s[N] for some struct or class = s? > > ie just extend operator[] to allow the return type to be different for di= fferent constexpr inputs. > > Then arrays (and vectors, etc) 'just work'. This assumes you never want t= o access the actual members of vector (ie v._ptr and v._size or whatever th= e vector implementation uses). I think it is safe to assume that any class = that overrides operator[] wants to be array-like and doesn't want its membe= rs exposed as a tuple. > > ? Maybe. But the function the problem is not in get(t). it is in=20 tuple_size::value, and is the size operator that need to be defined. Having the names of the operator is important, but I believe that we=20 need to confirm or not that we have to define them as operators or not=20 to avoid the library dependency. Vicente P.S. Boost.Hana make use already of the operator[] on heterogeneous=20 sequences. With user defined literal we could have // Access tuple elements with operator[] instead of std::get. Cat garfield =3D animals[1_c]; --=20 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 e= mail 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/56F043E5.7010505%40wanadoo.fr. .