220 34521 <52fe4cec-9a48-4518-ba8a-ebfec7ab0136@isocpp.org> article Path: news.gmane.org!.POSTED!not-for-mail From: euloanty@live.com Newsgroups: gmane.comp.lang.c++.isocpp.proposals Subject: Re: BOYCOTT interface keyword proposal! Date: Fri, 29 Sep 2017 13:38:35 -0700 (PDT) Lines: 151 Approved: news@gmane.org Message-ID: <52fe4cec-9a48-4518-ba8a-ebfec7ab0136@isocpp.org> References: <69c7d152-2104-f215-2b87-ce7b22b94fe1@gmail.com> <80a6f4f1-cfe2-4130-adb4-2b4d0db2ab07@isocpp.org> <4e510005-af95-4a39-a261-b993ffb7a20b@isocpp.org> <5facc504-0c16-431c-ac04-313039185938@isocpp.org> Reply-To: std-proposals@isocpp.org NNTP-Posting-Host: blaine.gmane.org Mime-Version: 1.0 Content-Type: multipart/mixed; boundary="----=_Part_2526_1457219539.1506717515853" X-Trace: blaine.gmane.org 1506717519 24114 195.159.176.226 (29 Sep 2017 20:38:39 GMT) X-Complaints-To: usenet@blaine.gmane.org NNTP-Posting-Date: Fri, 29 Sep 2017 20:38:39 +0000 (UTC) To: ISO C++ Standard - Future Proposals Original-X-From: std-proposals+bncBDPYX6PYRQNBBTG6XLHAKGQEGCGTSEI@isocpp.org Fri Sep 29 22:38:34 2017 Return-path: Envelope-to: gclcip-std-proposals@m.gmane.org Original-Received: from mail-ua0-f198.google.com ([209.85.217.198]) by blaine.gmane.org with esmtp (Exim 4.84_2) (envelope-from ) id 1dy23M-0005cD-3G for gclcip-std-proposals@m.gmane.org; Fri, 29 Sep 2017 22:38:32 +0200 Original-Received: by mail-ua0-f198.google.com with SMTP id q29sf320793uaf.12 for ; Fri, 29 Sep 2017 13:38:40 -0700 (PDT) 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 :list-post:list-help:list-archive:list-subscribe:list-unsubscribe; bh=qc/Xhu2RdBjHAH+1RcDgHOfYp6s6X3dMX7KLWSf0EYk=; b=Yv1IIzkhajhN2Ak7QoNopHY0VPgBS67Rckz7WGXavPcjCpyzHykvJga5PPXDRnl4lD NZMh6IaxcNbO1UAALz9xn73cnG/7cANHyzGQNrMbGXoNEhJjPg9y9ENOt3rG/NdMiwXl IFa+qjDKnCcVattLSbz2JoVqXL6kej/HZmXpVzzeHQtxSOpe097Jhe/8FQmCOYS82Qsf jbcyMFDYeO6mde4xt0OI83VfFElH3tT2HzLS9DFg6ll4SxnkCO8hIpGHI1ARr+uUx7RE odL2HIARcwADVpjvj0AKMmKjoaK4yTGyB+2IRzP1d2vkpIcwJeCobuSTUTEXRKQls/kM XemA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; 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=qc/Xhu2RdBjHAH+1RcDgHOfYp6s6X3dMX7KLWSf0EYk=; b=SS6w6t+EOSXAg+OtTt5ZpHok6ZxXRvUoO4sonx17RYmTgPERGqTe8+jyJGxPLFIyn5 rKKzNP5zZQlvG6bPXVO1rsCu1mdgGkwG0atXr11V3yTBP2DEKi8NA3d0iZq0GMQQ9rf9 w3N6pXfx1NmdB7hThLdD3OvS/ht0oQyOuRx8mn0DRBPWiQVg74GfNMIrRpAh9/llnqwJ FRf4E12li/y9y8CQeped49OUZ2jq4DarzD9e5WSmW5/RKYAQyUb6LNj6rkhepBbSVu1m Eim/9aoUTDKgYuYSSv8GkF1S8HOmR8rcfzTkhOxaHbGvUMDP4nx8CUiUbBukQe4oBgwF JkJw== X-Gm-Message-State: AHPjjUjWEokYSKP/wrRAVi4axX7gB9FRvV2K5zJuGyl4R6QU/PU7BM2b m8A4n1WbxcP2PS66CAIu3HEmWg== X-Google-Smtp-Source: AOwi7QCRwXtByyCY5liM0etzb4eH2u65AHVw6xHGiplqEmBq2juWwFu7JmmuCkLudE9dIkVkTw/otw== X-Received: by 10.176.68.34 with SMTP id m31mr995797uam.52.1506717517615; Fri, 29 Sep 2017 13:38:37 -0700 (PDT) X-BeenThere: std-proposals@isocpp.org Original-Received: by 10.31.219.65 with SMTP id s62ls2063838vkg.13.gmail; Fri, 29 Sep 2017 13:38:36 -0700 (PDT) X-Received: by 10.31.169.76 with SMTP id s73mr267618vke.14.1506717516346; Fri, 29 Sep 2017 13:38:36 -0700 (PDT) In-Reply-To: X-Original-Sender: euloanty@live.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:34521 Archived-At: ------=_Part_2526_1457219539.1506717515853 Content-Type: multipart/alternative; boundary="----=_Part_2527_1714154341.1506717515853" ------=_Part_2527_1714154341.1506717515853 Content-Type: text/plain; charset="UTF-8" Will we have standard type_erasure metaclass? On Friday, September 29, 2017 at 4:27:51 PM UTC-4, Manuel Bergler wrote: > > 2017-09-29 22:19 GMT+02:00 >: > >> You don't need that in C++. Type erasure can do everything you want. >> > > Depending on your implementation, the type-erasure itself also might be > implemented in terms of an abstract interface (see e.g. "Sean Parent's > Inheritance is the base class of evil", or Johnathan's reply) . Once we > have meta-classes, since it relies on reflection and compile-time code > injection, you can easily write a generic type-erasure wrapper > > template > class type_erased; > > that can be used with any user-defined `interface`. So an `interface` > meta-class still provides value in documenting the interface you have, even > if you don't use it in the Java sense. > > >> On Friday, September 29, 2017 at 11:57:38 AM UTC-4, Zhihao Yuan wrote: >>> >>> On Sep 29, 2017 5:31 AM, wrote: >>> >>> Conflict with concepts lite! I HATE OOP! >>> >>> >>> >>> I damn love OOP and Java, Ha Ha Ha! >>> >>> -- >>> Zhihao >>> >> -- >> 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-proposal...@isocpp.org . >> To post to this group, send email to std-pr...@isocpp.org . >> To view this discussion on the web visit >> https://groups.google.com/a/isocpp.org/d/msgid/std-proposals/5facc504-0c16-431c-ac04-313039185938%40isocpp.org >> >> . >> > > -- 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/52fe4cec-9a48-4518-ba8a-ebfec7ab0136%40isocpp.org. ------=_Part_2527_1714154341.1506717515853 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Will we have standard type_erasure metaclass?

On Fr= iday, September 29, 2017 at 4:27:51 PM UTC-4, Manuel Bergler wrote:
2017-09-29 22:19 GMT+02:00 <eulo...@live.com>:
You don= 9;t need that in C++. Type erasure can do everything you want.

Depending on your implementation, the type-er= asure itself also might be implemented in terms of an abstract interface=C2= =A0 (see e.g. "Sean Parent's Inheritance is the base class of evil= ", or Johnathan's reply) . Once we have meta-classes, since it rel= ies on reflection and compile-time code injection, you can easily write a g= eneric type-erasure wrapper

template <Interface I>
class type_erased;

=
that can be used with any user-defined `interfac= e`. So an `interface` meta-class still provides value in documenting the in= terface you have, even if you don't use it in the Java sense.
<= br>

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