220 38658 <1263c0e2-9de4-4859-ba99-12fb770c93ba@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: Thu, 14 Jun 2018 16:37:57 -0700 (PDT) Lines: 160 Approved: news@gmane.org Message-ID: <1263c0e2-9de4-4859-ba99-12fb770c93ba@isocpp.org> References: Reply-To: std-proposals@isocpp.org NNTP-Posting-Host: blaine.gmane.org Mime-Version: 1.0 Content-Type: multipart/mixed; boundary="----=_Part_5373_748019684.1529019477671" X-Trace: blaine.gmane.org 1529019353 12473 195.159.176.226 (14 Jun 2018 23:35:53 GMT) X-Complaints-To: usenet@blaine.gmane.org NNTP-Posting-Date: Thu, 14 Jun 2018 23:35:53 +0000 (UTC) Cc: rmbeer2@gmail.com, mihailnajdenov@gmail.com To: ISO C++ Standard - Future Proposals Original-X-From: std-proposals+bncBDI6L6W3SYLBBVXYRPMQKGQERQ3QAXQ@isocpp.org Fri Jun 15 01:35:48 2018 Return-path: Envelope-to: gclcip-std-proposals@m.gmane.org Original-Received: from mail-yw0-f199.google.com ([209.85.161.199]) by blaine.gmane.org with esmtp (Exim 4.84_2) (envelope-from ) id 1fTbmO-00038L-Lv for gclcip-std-proposals@m.gmane.org; Fri, 15 Jun 2018 01:35:48 +0200 Original-Received: by mail-yw0-f199.google.com with SMTP id q66-v6sf5850892ywc.18 for ; Thu, 14 Jun 2018 16:38:00 -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=Lc5FmOOQATUghgXL1ktioG/YQHMajFKwLfJSjG1TyCY=; b=aKZ50x+MyeQJKILVzKsYKRdSyyMUB9It5lMf/Y22M+FzEfjUntAuDlVoAjA2odwXAT kCdN28MPgBH2APfDhCYz44ODOK3NOKc0UtJ3ST0Mq0d4iejJ9dJOJPu0+PyAciKjJgom m9WWN5CEd3h1bhItwtffPSZ3yoMkL/G8/bnWKPJ4XZSxMsjGtFOFwpEeH5mHcis5FU/E seyxOx3WkUVyzcpDF3Ghc1rsl9K8GAwqR4VsE7GCrgE42oXfEnSOLJz7HaCgD/2nJSCg PMkut2Nw6uey25QmeJazufgJ+cnjBF9lJ8bjjneZ27B+JGbFWfuGN1AaI5Xo0bIDkYOm /E7A== 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=Lc5FmOOQATUghgXL1ktioG/YQHMajFKwLfJSjG1TyCY=; b=C/dkIs8a3CCLrNKX81dsnOMpqR13jZura45NJEJ1WjxbTKqJw2DxrrTnaIQR0rFPzs 2r8nC5paqyCH179sJOTKjGAEzlTsRhp0xCVtzaTknWMedK8itc4Gi6XhuArh3kp8MZOa vvOw6kyOL9E1nmAdvokkCkEHOfAMbu8yBZBbWZhBfgYJ3igEttoc+jYSGJM6tavdSv+5 u4zdQnBzFd4wAGih5olH+9pO3qiB5+XziF6u03Vg0wHNyKUx4KRaCxT8Ut0aBnakaNA2 A44GbWtNhSELZXi8eZOtPktoT4yY3jAbsnh0hfyHw3IwWX/3i9fhz0kltOw5YgFfiPRk Icmw== 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=Lc5FmOOQATUghgXL1ktioG/YQHMajFKwLfJSjG1TyCY=; b=PHLfZXMBeXMBxSxhGXbuvqS6q8uz/TXSGawE1p3rgFN7d23Y8Sk9QIk5Fsr6qX6QZI 5RnFI8H5rKm8hW2i3m0Oc4EQNGrpMS1fnI/tdFv3bqrnu/b9YhLiGIjzj3tCG621lb0L MCSrfHUa3gY8QvQFGtrU+vptxy1IxkE/WrkHowMYkzylZeHHZIILS2WmLHSoAOeFfVfS XacJzIpX3UmVjoW9GhhNQDFlBlUiNftVIE6JnqtNYRi+BEeRwwgJeYG7jlGtcRIWjsZl Dw8HAKE3sUuWcjZeRAQJbMbxVI3p7WpOtz1GATaMQaPfMlVB6Ytd05j1OuM8RwwwvRL/ VhTw== X-Gm-Message-State: APt69E2fuCthTkoLQrm/6TTNM5nQd9h3uXpjstBajUztNbZstfinZuNs GZrUfrxjvT5jAmBQ7RJ9TXh+xg== X-Google-Smtp-Source: ADUXVKLbBSkoUHKxoQFk7GkGtth9FNdsFg2h2bSqmR+uMFrK/tzSLOr3zpLXhLmFSKfpZzoBCxDTZA== X-Received: by 2002:a81:4e45:: with SMTP id c66-v6mr1389517ywb.177.1529019479670; Thu, 14 Jun 2018 16:37:59 -0700 (PDT) X-BeenThere: std-proposals@isocpp.org Original-Received: by 2002:a25:e7cd:: with SMTP id e196-v6ls2702037ybh.0.gmail; Thu, 14 Jun 2018 16:37:58 -0700 (PDT) X-Received: by 2002:a25:9082:: with SMTP id t2-v6mr640810ybl.1.1529019478280; Thu, 14 Jun 2018 16:37:58 -0700 (PDT) In-Reply-To: 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:38658 Archived-At: ------=_Part_5373_748019684.1529019477671 Content-Type: multipart/alternative; boundary="----=_Part_5374_1386542103.1529019477671" ------=_Part_5374_1386542103.1529019477671 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable It seems that nobody else says it... With template you just broke the structure of the classes, and did not even= =20 take into account the class "A a;". And what is the last answer? It does=20 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/1263c0e2-9de4-4859-ba99-12fb770c93ba%40isocpp.or= g. ------=_Part_5374_1386542103.1529019477671 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
It seems that nobody else says it...
Wi= th template you just broke the structure of the classes, and did not even t= ake into account the class "A a;". And what is the last answer? I= t does not explain anything. In short, no answer works...
Parece que nadie mas lo comenta...
Con template simpl= emente acabaste de romper con la estructura de las clases, y ni siquiera lo= tomaste en cuenta la clase "A a;". Y en que consiste la ultima r= espuesta? No explica nada. En fin, ninguna respuesta sirve...

= El martes, 12 de junio de 2018, 4:28:30 (UTC-3), mihailn...@gmail.com escri= bi=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:" << a.z << std::e= ndl;
=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:&qu= ot; << 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
};

<= b>
Solution 3


class B=C2=A0
{
pu= blic:
=C2=A0 B(A* a_) : a(a_) { }
=C2=A0 B() : a(new A(1)) { }
=C2= =A0 void f2() {
=C2=A0=C2=A0 std::cout << "A:" << = a->z << std::endl;
=C2=A0 }
// virtual A a; // Use A only= from B
=C2=A0 =C2=A0 std::unique_ptr<A> a;
};
<= br>
class D : public B=C2=A0
{
public:
=C2= =A0 D() : B(new C(3)) { }
=C2=A0 void f2(){
=C2=A0 =C2=A0 std::cout &= lt;< "C+A:" << a->z << std::endl;
=C2=A0 =C2= =A0 B::f2();
=C2=A0 }
// virtual C a; // Use C+A only from D
};=


Solution 4

Develop in terms of interfaces only


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To view this discussion on the web visit https://groups.google.= com/a/isocpp.org/d/msgid/std-proposals/1263c0e2-9de4-4859-ba99-12fb770c93ba= %40isocpp.org.
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