220 39142 <44ff0208-9ba9-4765-9983-e71125ed88fa@isocpp.org> article Path: news.gmane.org!.POSTED!not-for-mail From: rmbeer2@gmail.com Newsgroups: gmane.comp.lang.c++.isocpp.proposals Subject: Re: new feature: declare data that replaces the previous one, or similar situation.... Date: Fri, 13 Jul 2018 05:36:07 -0700 (PDT) Lines: 236 Approved: news@gmane.org Message-ID: <44ff0208-9ba9-4765-9983-e71125ed88fa@isocpp.org> References: <1263c0e2-9de4-4859-ba99-12fb770c93ba@isocpp.org> <503c3169-7bda-438b-ac1e-a6a7347b053f@isocpp.org> Reply-To: std-proposals@isocpp.org NNTP-Posting-Host: blaine.gmane.org Mime-Version: 1.0 Content-Type: multipart/mixed; boundary="----=_Part_113519_1789480809.1531485367823" X-Trace: blaine.gmane.org 1531485243 22077 195.159.176.226 (13 Jul 2018 12:34:03 GMT) X-Complaints-To: usenet@blaine.gmane.org NNTP-Posting-Date: Fri, 13 Jul 2018 12:34:03 +0000 (UTC) Cc: rmbeer2@gmail.com, mihailnajdenov@gmail.com To: ISO C++ Standard - Future Proposals Original-X-From: std-proposals+bncBDI6L6W3SYLBBOFZULNAKGQEXRY3NIQ@isocpp.org Fri Jul 13 14:33:59 2018 Return-path: Envelope-to: gclcip-std-proposals@m.gmane.org Original-Received: from mail-yb0-f200.google.com ([209.85.213.200]) by blaine.gmane.org with esmtp (Exim 4.84_2) (envelope-from ) id 1fdxGo-0005dE-Ml for gclcip-std-proposals@m.gmane.org; Fri, 13 Jul 2018 14:33:58 +0200 Original-Received: by mail-yb0-f200.google.com with SMTP id e6-v6sf22553988ybk.23 for ; Fri, 13 Jul 2018 05:36:10 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=isocpp-org.20150623.gappssmtp.com; s=20150623; h=date:from:to:cc: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=2MdTzNBhtxapXBJAXcnHhpZdopozCm6aE4yED4FVSsI=; b=jkUOHJM0aUQ94GZiJNO6K4hC4nbuaG7YhT49Z/3LzekWnIWAmwdxBgnTXueG7hCoSo r5qjTUoy3FxIs5h5a0fXxMqwcGSEguTSQ4jIcrGldUaueMeaf/brCB+jWuqENG7Nh79H hAK3QSEH/qLomTpx25TeUBf5KWDybkucwUla5VNMxeIYwm+Cu85p3KVhyLmR6XJkeMLN 4G8M/48HAzFHgt2HYWXdMT/fA1PrP3TulxSCxL7rxYoqFw6Hb44GDytlXlj6nMu8hD37 b2imZpb10/FXow2N7wyu4ShPNjOygXnIiZ5P+4GxCIChH52KbT1ISM8qcR4Tt/gRdw0e 355w== DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=date:from:to:cc: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=2MdTzNBhtxapXBJAXcnHhpZdopozCm6aE4yED4FVSsI=; b=GDGDxHBUfUfCovsX2RRbK6GdLfcG1hS3wHUk6vFtHzxfsKN5vK4P3mKcDrbqEc0taK NxsQ/XgIMlJM6c6hEYN/oxncYv51k/gAPKL9Aczsip4K4lEgqU6O+Ux0B6blimzUylAY H7s8ScibjEsleWG9ushMKpc+BlLkQi4UN2orVqcaS7EZ7H8h8p4wGXFt9TEiO4xbzRtS UFNoQUG+bz1YvMDaDTEls279hiFKHQnjJEOs373/bWT1bv7ltguWLFxofrFVzoA33ukb /wbEMso15vf626Ra+a2t+drp/qsrDGUgFgXLZ6lDE3ihX85T3TG78WprdXjJSlUnU400 rZLw== 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:cc: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=2MdTzNBhtxapXBJAXcnHhpZdopozCm6aE4yED4FVSsI=; b=Gur8RbQNsAM2/ZcVKLN9bwRYcUIxsdlcFIqfIzzZYPRd9IGWRlogKVmAcbyybJx0TA kx3/w2QhoZ41wzMvSYIqAfqiKdhUYi4FQLeXkbAtpw5STJnNcf54PWFTOBPZZyeCux4f RMAJJYwqUSmp0c2uFMqR7iEWCgZLuYGTkjm84peBrINwQfPx7zIG+Py91ZZXH2cBOKhw f/51kDyuBySqWaKzOeqbQGTkVKxtOnKpnPG5ALUm2zAmrgXahfX1kf9JP7emu2ZBcevI m90pt3bGuJupvES6CHxs0iKxFVXtZ1FYRwiiFS9sxG5VtOMTBpKyEBMAsyEcd/yCqvJv dRFQ== X-Gm-Message-State: AOUpUlHmwGTy5rCDzqpV+9c5uuiZgPgU21Go7jScAov2u9YIOfivHNiN uc/0XcJKqNM7l39ZuSTqQGQ3MQ== X-Google-Smtp-Source: AAOMgpfNoNpcHMXc+SaVCURyb881/D9zCBGOgCeLUKiln90xMbxFAUI+BKOJiClTzLmum1ZhsIrbjA== X-Received: by 2002:a25:a290:: with SMTP id c16-v6mr1836877ybi.59.1531485369520; Fri, 13 Jul 2018 05:36:09 -0700 (PDT) X-BeenThere: std-proposals@isocpp.org Original-Received: by 2002:a0d:f302:: with SMTP id c2-v6ls4118557ywf.13.gmail; Fri, 13 Jul 2018 05:36:08 -0700 (PDT) X-Received: by 2002:a81:5705:: with SMTP id l5-v6mr592673ywb.6.1531485368259; Fri, 13 Jul 2018 05:36:08 -0700 (PDT) In-Reply-To: <503c3169-7bda-438b-ac1e-a6a7347b053f@isocpp.org> X-Original-Sender: rmbeer2@gmail.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: , Xref: news.gmane.org gmane.comp.lang.c++.isocpp.proposals:39142 Archived-At: ------=_Part_113519_1789480809.1531485367823 Content-Type: multipart/alternative; boundary="----=_Part_113520_840654334.1531485367823" ------=_Part_113520_840654334.1531485367823 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Is this really a C ++ standard language community? So far I have only=20 received 2 stupid answers and a huge silence after waiting a lot of time. I= =20 expected more serious participation from the community as to how to solve= =20 this problem, because evidently with the current language you can not. =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D Realmente esta es una comunidad de lenguaje estandar C++? Hasta ahora solo= =20 he recibido 2 respuestas estupidas y un silencio enorme tras esperar un=20 monton de tiempo. Esperaba una participacion mas seria por parte de la=20 comunidad como pensar en como resolver este problema, porque evidentemente= =20 con el lenguaje actual no se puede. El viernes, 15 de junio de 2018, 5:55:43 (UTC-3), mihailn...@gmail.com=20 escribi=C3=B3: > > From what you presented you want to (literarily) override data so it is= =20 > not duplicated. And there are many ways to do that, both statically or=20 > dynamically.=20 > > I forgot Variant is also an option. > > The last solution is to simply not let data duplications happen by workin= g=20 > with abstract classes.=20 > > > Alternatives aside, you can try implementing your solution with=20 > boilerplate code and see what is not there, if any, that make it impossib= le=20 > and suggest something that might be useful outside that case as well, > and if everything is there, then you can suggest a library solution. > > > > On Friday, June 15, 2018 at 2:37:57 AM UTC+3, rmb...@gmail.com wrote: >> >> It seems that nobody else says it... >> With template you just broke the structure of the classes, and did not= =20 >> even take into account the class "A a;". And what is the last answer? It= =20 >> does not explain anything. In short, no answer works... >> >> Parece que nadie mas lo comenta... >> Con template simplemente acabaste de romper con la estructura de las=20 >> clases, y ni siquiera lo tomaste en cuenta la clase "A a;". Y en que=20 >> consiste la ultima respuesta? No explica nada. En fin, ninguna respuesta= =20 >> sirve... >> >> El martes, 12 de junio de 2018, 4:28:30 (UTC-3), mihailn...@gmail.com=20 >> escribi=C3=B3: >>> >>> *Solution 2* >>> >>> >>> template >>> class B { >>> public: >>> B(int i=3D1) : a(i) { } >>> void f2() { >>> std::cout << "A:" << a.z << std::endl; >>> } >>> // virtual A a; // Use A only from B >>> T a; >>> }; >>> class D : public B { >>> public: >>> D() : B(3) { } >>> void f2(){ >>> std::cout << "C+A:" << a.z << std::endl; >>> B::f2(); >>> } >>> // virtual C a; // Use C+A only from D >>> }; >>> >>> >>> *Solution 3* >>> >>> >>> class B=20 >>> { >>> public: >>> B(A* a_) : a(a_) { } >>> B() : a(new A(1)) { } >>> void f2() { >>> std::cout << "A:" << a->z << std::endl; >>> } >>> // virtual A a; // Use A only from B >>> std::unique_ptr a; >>> }; >>> >>> class D : public B=20 >>> { >>> public: >>> D() : B(new C(3)) { } >>> void f2(){ >>> std::cout << "C+A:" << a->z << std::endl; >>> B::f2(); >>> } >>> // virtual C a; // Use C+A only from D >>> }; >>> >>> >>> *Solution 4* >>> >>> Develop in terms of interfaces only >>> >>> >>> --=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/44ff0208-9ba9-4765-9983-e71125ed88fa%40isocpp.or= g. ------=_Part_113520_840654334.1531485367823 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Is this really a C ++ standard language community? So far = I have only received 2 stupid answers and a huge silence after waiting a lo= t of time. I expected more serious participation from the community as to h= ow to solve this problem, because evidently with the current language you c= an not.

=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D

Realmente esta es una comunidad de le= nguaje estandar C++? Hasta ahora solo he recibido 2 respuestas estupidas y = un silencio enorme tras esperar un monton de tiempo. Esperaba una participa= cion mas seria por parte de la comunidad como pensar en como resolver este = problema, porque evidentemente con el lenguaje actual no se puede.

<= br>El viernes, 15 de junio de 2018, 5:55:43 (UTC-3), mihailn...@gmail.com e= scribi=C3=B3:
=
From what you presented you want to (literarily) override data so it i= s not duplicated. And there are many ways to do that, both statically or dy= namically.=C2=A0

I forgot Variant is also an optio= n.

The last solution is to simply not let data dup= lications happen by working with abstract classes.=C2=A0


Alternatives aside, you can try implementing your sol= ution with boilerplate code and see what is not there, if any, that make it= impossible and suggest something that might be useful outside that case as= well,
=C2=A0and if everything is there, then you can suggest a l= ibrary solution.



On Friday, June 15,= 2018 at 2:37:57 AM UTC+3, rmb...@gmail.com wrote:
It seems that nobody else says= it...
With template you just broke the structure of the clas= ses, and did not even take into account the class "A a;". And wha= t is the last answer? It does not explain anything. In short, no answer wor= ks...

Parece que nadie mas lo comenta...
=
Con template simplemente acabaste de romper con la estructura de las c= lases, y ni siquiera lo tomaste en cuenta la clase "A a;". Y en q= ue consiste la ultima respuesta? No explica nada. En fin, ninguna respuesta= sirve...

El martes, 12 de junio de 2018, 4:28:30 (UTC-3), = mihailn...@gmail.com escribi=C3=B3:
Solution 2


template<class T>
class B {
public:
=C2=A0=C2= =A0=C2=A0 B(int i=3D1) : a(i) { }
=C2=A0=C2=A0=C2=A0 void f2() {
=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 std::cout << "A:" &= lt;< a.z << std::endl;
=C2=A0=C2=A0=C2=A0 }
//=C2=A0=C2=A0= =C2=A0 virtual A a; // Use A only from B
=C2=A0=C2=A0=C2=A0 T a;
};
class D : public B<= C> {
public:
=C2=A0=C2=A0=C2=A0 D() : B<C>(3) { }
=C2=A0= =C2=A0=C2=A0 void f2(){
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 std::= cout << "C+A:" << a.z << std::endl;
=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 B::f2();
=C2=A0=C2=A0=C2=A0 }
//= =C2=A0=C2=A0=C2=A0 virtual C a; // Use C+A only from D
};


Solution 3

class B=C2= =A0
{
public:
=C2=A0 B(A* a_) : a(a_) { }
=C2=A0 B= () : a(new A(1)) { }
=C2=A0 void f2() {
=C2=A0=C2=A0 std::cout <&l= t; "A:" << a->z << std::endl;
=C2=A0 }
// = virtual A a; // Use A only from B
=C2=A0 =C2=A0 std::unique_ptr<A>= ; a;
};

class D : public B=C2=A0
{
public:
=C2=A0 D() : B(new C(3)) { }
=C2=A0 void f2(){=C2=A0 =C2=A0 std::cout << "C+A:" << a->z <<= ; std::endl;
=C2=A0 =C2=A0 B::f2();
=C2=A0 }
// virtual C a; //= Use C+A only from D
};

<= /div>
Solution 4

Develop in = terms of interfaces only
<= br>

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