220 34520 <1c45e44b-1b09-4277-b034-5a5deaf2ed9d@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 13:30:52 -0700 (PDT) Lines: 129 Approved: news@gmane.org Message-ID: <1c45e44b-1b09-4277-b034-5a5deaf2ed9d@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> <4e5ffae5-10f9-23a7-ddbd-b8d3bb195cab@gmail.com> Reply-To: std-proposals@isocpp.org NNTP-Posting-Host: blaine.gmane.org Mime-Version: 1.0 Content-Type: multipart/mixed; boundary="----=_Part_2682_339043108.1506717052215" X-Trace: blaine.gmane.org 1506717051 11615 195.159.176.226 (29 Sep 2017 20:30:51 GMT) X-Complaints-To: usenet@blaine.gmane.org NNTP-Posting-Date: Fri, 29 Sep 2017 20:30:51 +0000 (UTC) To: ISO C++ Standard - Future Proposals Original-X-From: std-proposals+bncBDPYX6PYRQNBB7G2XLHAKGQEAV7ERPQ@isocpp.org Fri Sep 29 22:30:47 2017 Return-path: Envelope-to: gclcip-std-proposals@m.gmane.org Original-Received: from mail-ua0-f200.google.com ([209.85.217.200]) by blaine.gmane.org with esmtp (Exim 4.84_2) (envelope-from ) id 1dy1vq-0002ZK-BG for gclcip-std-proposals@m.gmane.org; Fri, 29 Sep 2017 22:30:46 +0200 Original-Received: by mail-ua0-f200.google.com with SMTP id n94sf316901uan.5 for ; Fri, 29 Sep 2017 13:30:54 -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=n+TtPqLHLWknMDcPaQOx+sYHMGlEmm2xdYLv5ZqzCSE=; b=ZKpsHHnSCwIkC0ftRXy8+O8+udii+kL2EgGrHv3q7w1Vdz0BXJyJ/C9iNMP8KDBNsd vpAgAp1uWg+xWHmVgFgMaOyXSS994h163W/u/qq0qc79sjMwPpqqNldGD95MCu3HiS03 aKGpHOq/9vAYEtJkcJiz/NbVUz8qyu1CV8PvjrIsoh1O9YGg/nT7aZuoaAOZmTgc8GU9 jxDDl1ThE1Q5vnWRBNztvGepZwr2xlLfKF5YQ3VN2mgMpkdntXFnzbZuAtH34UCdPDKE LR6yXtMbZXZQUMgbJFy+iWLrwQw2gu1jm1tEpFxiipkVFFEqNstx044dFXmF2qOA+ZX3 rgFw== 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=n+TtPqLHLWknMDcPaQOx+sYHMGlEmm2xdYLv5ZqzCSE=; b=plWPPRHdYA2AMMP5FeFLJlPMPSaInCLq+GOQ8dQEn/xa7fEK+jC4ojM+Dn1rHWjzB7 PuRB8YTM8b0luJ8fdS+DKc5XRcO60EzR0V/jBmfd5NPid0uXkUZ8+dalIw4zuV+lG6re 4I++MBw17eH7xDNeN0cLlHNPh4B72XctypY/grWP8bG22NagpmJ6sXXfNLw6Ik4k4wBh s08pM7hiNajv3YqLm/bw3bZc7wk9uPw868ullV78Qh4XCdm2k+0BJdmzbyLMeyNzjOYG 2HsUWk675+EMElnuiXPfUAa6BNo0w5zl/Kp2ChpXVeBRLS09qOUY0S7wiBwVuI6R7SN0 zfFA== X-Gm-Message-State: AHPjjUibdAS+xULHyBsG8YwafYvmjBbE4X/YGVt5kWV8Cuf/ukbIGnY6 R0Z5QYM2EDwzdHVGuA1jW21I6Q== X-Google-Smtp-Source: AOwi7QBRv9Miq7NOq3yqc4PEWoamQt5VcXUBcqm95TJtZbxPKoVU0d4q/6NO2gDM6pQ19CKQDXONtg== X-Received: by 10.176.19.238 with SMTP id n43mr2054456uae.73.1506717053646; Fri, 29 Sep 2017 13:30:53 -0700 (PDT) X-BeenThere: std-proposals@isocpp.org Original-Received: by 10.176.69.236 with SMTP id u99ls2288995uau.7.gmail; Fri, 29 Sep 2017 13:30:52 -0700 (PDT) X-Received: by 10.31.167.75 with SMTP id q72mr332058vke.22.1506717052734; Fri, 29 Sep 2017 13:30:52 -0700 (PDT) In-Reply-To: <4e5ffae5-10f9-23a7-ddbd-b8d3bb195cab@gmail.com> 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:34520 Archived-At: ------=_Part_2682_339043108.1506717052215 Content-Type: multipart/alternative; boundary="----=_Part_2683_384946726.1506717052215" ------=_Part_2683_384946726.1506717052215 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Ok. I have read the metaclass proposal. It is great. I'm sorry I'm wrong. How about implement "interface" as type_erasure metaclass? On Friday, September 29, 2017 at 4:23:09 PM UTC-4, Jonathan M=C3=BCller wro= te: > On 29.09.2017 22:19, eulo...@live.com wrote:=20 > > You don't need that in C++. Type erasure can do everything you want.=20 > > i.e.=20 > > // type erased holder of anything having .foo()=20 > class any_foo=20 > {=20 > public:=20 > =E2=80=A6=20 > > private:=20 > interface foo_base=20 > {=20 > void foo();=20 > };=20 > > template =20 > class foo_impl : public foo_base=20 > {=20 > T obj_;=20 > > public:=20 > =E2=80=A6=20 > > void foo() override=20 > {=20 > obj_.foo();=20 > }=20 > };=20 > > std::unique_ptr ptr_;=20 > };=20 > --=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/1c45e44b-1b09-4277-b034-5a5deaf2ed9d%40isocpp.or= g. ------=_Part_2683_384946726.1506717052215 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Ok. I have read the metaclass proposal. It is great. = I'm sorry I'm wrong.

How about implement &= quot;interface" as type_erasure metaclass?

On Friday, September= 29, 2017 at 4:23:09 PM UTC-4, Jonathan M=C3=BCller wrote:
On 29.09.2017 22:19, eulo...@live.com wrot= e:
> You don't need that in C++. Type erasure can do everything you= want.

i.e.

// type erased holder of anything having .foo()
class any_foo
{
public:
=C2=A0 =C2=A0 =E2=80=A6

private:
=C2=A0 =C2=A0 interface foo_base
=C2=A0 =C2=A0 {
=C2=A0 =C2=A0 =C2=A0 =C2=A0 void foo();
=C2=A0 =C2=A0 };

=C2=A0 =C2=A0 template <typename T>
=C2=A0 =C2=A0 class foo_impl : public foo_base
=C2=A0 =C2=A0 {
=C2=A0 =C2=A0 =C2=A0 =C2=A0 T obj_;

=C2=A0 =C2=A0 public:
=C2=A0 =C2=A0 =C2=A0 =C2=A0=E2=80=A6

=C2=A0 =C2=A0 =C2=A0 =C2=A0void foo() override
=C2=A0 =C2=A0 =C2=A0 =C2=A0{
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0obj_.foo();
=C2=A0 =C2=A0 =C2=A0 =C2=A0}
=C2=A0 =C2=A0 };

=C2=A0 =C2=A0 std::unique_ptr<foo_base> ptr_;
};

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