220 25006 <05ac78e7-3d30-4a99-ad0f-a3d29497e2ff@isocpp.org> article Path: news.gmane.org!not-for-mail From: "'Walt Karas' via ISO C++ Standard - Future Proposals" Newsgroups: gmane.comp.lang.c++.isocpp.proposals Subject: Re: "Components" template with implicitly defined partial specializations for all classes Date: Sun, 6 Mar 2016 15:04:35 -0800 (PST) Lines: 103 Approved: news@gmane.org Message-ID: <05ac78e7-3d30-4a99-ad0f-a3d29497e2ff@isocpp.org> References: <56D9E17F.2070202@wanadoo.fr> <2b0bcca0-0939-49f7-939b-4d688f8dfe34@isocpp.org> <324dbff9-84da-46f2-b2f3-3d9fe0cc2082@isocpp.org> <56DA88DF.90000@wanadoo.fr> <7e46c46d-2e18-4cec-92c1-4f4d7fbc786b@isocpp.org> <39bbeb02-62b8-497b-8d65-5780a6baca97@isocpp.org> Reply-To: std-proposals@isocpp.org NNTP-Posting-Host: plane.gmane.org Mime-Version: 1.0 Content-Type: multipart/mixed; boundary="----=_Part_419_1725283238.1457305475456" X-Trace: ger.gmane.org 1457305483 30912 80.91.229.3 (6 Mar 2016 23:04:43 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Sun, 6 Mar 2016 23:04:43 +0000 (UTC) To: ISO C++ Standard - Future Proposals Original-X-From: std-proposals+bncBDFLZXWOVYIBBBHP6K3AKGQESHES3BA@isocpp.org Mon Mar 07 00:04:39 2016 Return-path: Envelope-to: gclcip-std-proposals@m.gmane.org Original-Received: from mail-pa0-f71.google.com ([209.85.220.71]) by plane.gmane.org with esmtp (Exim 4.69) (envelope-from ) id 1achj4-0003pr-Rs for gclcip-std-proposals@m.gmane.org; Mon, 07 Mar 2016 00:04:39 +0100 Original-Received: by mail-pa0-f71.google.com with SMTP id fl4sf147291495pad.2 for ; Sun, 06 Mar 2016 15:04:38 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=isocpp-org.20150623.gappssmtp.com; s=20150623; h=date:from:to:message-id:in-reply-to:references:subject:mime-version :x-original-sender:reply-to:precedence:mailing-list:list-id :x-spam-checked-in-group:list-post:list-help:list-archive :list-subscribe:list-unsubscribe; bh=6y5B5kl1R4kYjzUP/kbcOyHHlOpmPmnCciAnijfAQW0=; b=P7VKe0uTfjjLleBgY7+AAqlxOszx8KsV6zfK7gE1PWOKY+uAbpUyIwGyK6YZif161f n66qsylSHzXPZK+IwFaQ+2GT9wc7LDyvjiutx5j79McH8c1jqka2+P3//UcMqvV7+NLi lzknEtnwGg0PbxbIyw6b8hYm2MeSFDk+B4bl698Q2x6UCQm7GIcQJdPble/3Xj9AXPYp RGrIu7/hnnODw6Q+1EjLdhM/a1fCmMhpi1p3bzZxqR0MH+GZXeHjkXi5te5M5jTo3zDk jxq/pQKyzd0/Kc2kp9sYxfq8zL11Y3pr3w6H2NgvhwTOsC8vuFdb+qzJ/5dOXWwayWUB XMJg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:date:from:to:message-id:in-reply-to:references :subject:mime-version:x-original-sender:reply-to:precedence :mailing-list:list-id:x-spam-checked-in-group:list-post:list-help :list-archive:list-subscribe:list-unsubscribe; bh=6y5B5kl1R4kYjzUP/kbcOyHHlOpmPmnCciAnijfAQW0=; b=c5f/I1LTp+yoiZu79A9g07YsupgGvO/UB7d4Fbo8TOALeUIhGe4ond/FJ/qah3aqzX LkfIVQcD5fH8YPNXdphQmRDNQSLz9h1aKQZT3wWLBHgytNAjD7TaHV2IVce4wDgYHT4j Mcqhn3OdikUpHP5cUYRFl1DzjoBs6LbTj74kF8t2xM7GEoSipmAFH+qVHLpl504r9ssd XLUIH+YyQKl1SF01GjXDP55GReDN2Lfuq+v5TQ9GQxmTDdjOnzUnEccFV1YJ7ytejl0d qj0WLngHzvKMquuWkOVihEUuNHbP0grM2oZyogiXlZ+XpMa7K9We/x7GWBwM5KIj6sK4 nAvg== X-Gm-Message-State: AD7BkJK8RI/Mfr1ec8U8ZDiIiFuqQnFjFgGLvSDg8kAAGn/QMgpScamTVb45J0Q1D0LYKw== X-Received: by 10.66.124.200 with SMTP id mk8mr14237911pab.27.1457305477678; Sun, 06 Mar 2016 15:04:37 -0800 (PST) X-BeenThere: std-proposals@isocpp.org Original-Received: by 10.107.33.85 with SMTP id h82ls731186ioh.63.gmail; Sun, 06 Mar 2016 15:04:36 -0800 (PST) X-Received: by 10.50.110.41 with SMTP id hx9mr152346igb.2.1457305476664; Sun, 06 Mar 2016 15:04:36 -0800 (PST) In-Reply-To: <39bbeb02-62b8-497b-8d65-5780a6baca97@isocpp.org> X-Original-Sender: wkaras@yahoo.com 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: , X-Original-From: Walt Karas Xref: news.gmane.org gmane.comp.lang.c++.isocpp.proposals:25006 Archived-At: ------=_Part_419_1725283238.1457305475456 Content-Type: multipart/alternative; boundary="----=_Part_420_1848733167.1457305475457" ------=_Part_420_1848733167.1457305475457 Content-Type: text/plain; charset=UTF-8 On Sunday, March 6, 2016 at 2:40:30 PM UTC-5, Cleiton Santoia wrote: > > >> Experience has shown that good layered architectures are generally >> advantageous. A rule of thumb for a good layered architecture is to have >> one capability in a lower layer that supports multiple capabilities in a >> higher layer. As opposed to supporting just one or some or all of those >> multiple capabilities in the lower layer. The base language is the lowest >> layer of the C++ architecture. Therefore, I think it's likely to be better >> to have a capability in the base language that allows for support of >> reasonably good generic comparison operators, generic stream input/output >> operators, generic std::hash, maybe generic JSON/XML input/output, etc >> using library code above the base layer. >> > > In the both reflection proposals there are a sample of JSON serialization > (in sligtly different ways), but both static and without "mapping" > functions. > You dont need that "Component" structure you proposed, you just expand the > pack thru folding. > > Here the code your > 10 liner 'operator ==' lib-olny on top of reflection ( from line 8 to 18 ). > > Please pay attention on lines 10 and 16, in 10 we have a "template > folding" and in 16 we have the only line that will change after reflection > be accepted (hopefully). > > Can you show an example that would work also if the class had private data members and base classes? -- 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/05ac78e7-3d30-4a99-ad0f-a3d29497e2ff%40isocpp.org. ------=_Part_420_1848733167.1457305475457 Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: quoted-printable
On Sunday, March 6, 2016 at 2:40:30 PM UTC-5, Cleiton Sant= oia wrote:

E= xperience has shown that good layered architectures are generally advantage= ous. =C2=A0A rule of thumb for a good layered architecture is to have one c= apability in a lower layer that supports multiple capabilities in a higher = layer. =C2=A0As opposed to supporting just one or some or all of those mult= iple capabilities in the lower layer. =C2=A0The base language is the lowest= layer of the C++ architecture. =C2=A0Therefore, I think it's likely to= be better to have a capability in the base language that allows for suppor= t of reasonably good generic comparison operators, generic stream input/out= put operators, generic std::hash, maybe generic JSON/XML input/output, etc = using library code above the base layer.

<= /div>
In the both reflection proposals there are a sample of JSON seria= lization (in sligtly different ways), but both static and without "map= ping" functions.
You dont need that "Component"= ; structure you proposed, you just expand the pack thru folding.=C2=A0
<= /div>

Here the code=C2=A0your 10 liner &= #39;operator =3D=3D' lib-olny on top of reflection ( from line 8 to 18 = ).=C2=A0

Please pay attention on lines 10 and = 16, in 10 we have a "template folding" and in 16 we have the only= line that will change after reflection be accepted=C2=A0(hopefully).
=


Can you show an examp= le that would work also if the class had private data members and base clas= ses?=C2=A0

--
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To view this discussion on the web visit https://groups.google.= com/a/isocpp.org/d/msgid/std-proposals/05ac78e7-3d30-4a99-ad0f-a3d29497e2ff= %40isocpp.org.
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