220 14664 article Path: news.gmane.org!not-for-mail From: corentin.schreiber@cea.fr Newsgroups: gmane.comp.lang.c++.isocpp.proposals Subject: Re: "const public:" and "const private:" to avoid to write "T Get() const" member functions Date: Thu, 20 Nov 2014 15:17:40 -0800 (PST) Lines: 108 Approved: news@gmane.org Message-ID: References: Reply-To: std-proposals@isocpp.org NNTP-Posting-Host: plane.gmane.org Mime-Version: 1.0 Content-Type: multipart/mixed; boundary="----=_Part_6905_1201651892.1416525460885" X-Trace: ger.gmane.org 1416525470 32326 80.91.229.3 (20 Nov 2014 23:17:50 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Thu, 20 Nov 2014 23:17:50 +0000 (UTC) Cc: mw_triad@users.sourceforge.net, corentin.schreiber@cea.fr To: std-proposals@isocpp.org Original-X-From: std-proposals+bncBCX4RQEPQAMBBFPNXGRQKGQEDNBX5QQ@isocpp.org Fri Nov 21 00:17:43 2014 Return-path: Envelope-to: gclcip-std-proposals@m.gmane.org Original-Received: from mail-pa0-f69.google.com ([209.85.220.69]) by plane.gmane.org with esmtp (Exim 4.69) (envelope-from ) id 1Xrays-0003cU-QA for gclcip-std-proposals@m.gmane.org; Fri, 21 Nov 2014 00:17:43 +0100 Original-Received: by mail-pa0-f69.google.com with SMTP id et14sf19061781pad.8 for ; Thu, 20 Nov 2014 15:17:42 -0800 (PST) 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:cc:message-id:in-reply-to :references:subject:mime-version:content-type:x-original-sender :reply-to:precedence:mailing-list:list-id:list-post:list-help :list-archive:list-subscribe:list-unsubscribe; bh=wWI3HvzD5CgSlmqbHPXq7/pgTPfTYRNDJTcwIyo9CAk=; b=FHPuTCssxI3uQkUOriOeuG2HeOuu0Ncjw5vriVERTzjhrBPyNo8DcGi5BKlwKoeifu mdz9E+59WpIiDnL+5vtU+7ZTcrEio0IAKyYC/Qcnl4iRtm96/nyCWuYlyUSqi9c3DrHa kS4vP3kTRlxvwFJ8pNbPi6k1ikTwZbGA9l6ABidgfK18QCiXbKxdQ6WizhWQw5AHsInC 26Lc5foMSSUei1JrhW3JUPdswJvonIN2V8zz437nKREbsf/mt0TegQRpnRvepM2/FEsh igJ4ar3J7Le7gSAhGtnByHscdxmIebgk1Xj0Os941pIBzPTW+QxQLvRaddxe5DH9wvIn BuNA== X-Gm-Message-State: ALoCoQnCkC73uC0QwlIGB1kGLtjtsZo/ojsRgc2z3paVG78ZvHcX6P7DmIolJX9Bff7QbBpAvKcH X-Received: by 10.66.124.132 with SMTP id mi4mr1137869pab.30.1416525462080; Thu, 20 Nov 2014 15:17:42 -0800 (PST) X-BeenThere: std-proposals@isocpp.org Original-Received: by 10.140.88.243 with SMTP id t106ls498552qgd.88.gmail; Thu, 20 Nov 2014 15:17:41 -0800 (PST) X-Received: by 10.140.40.20 with SMTP id w20mr15450qgw.2.1416525461304; Thu, 20 Nov 2014 15:17:41 -0800 (PST) In-Reply-To: X-Original-Sender: corentin.schreiber@cea.fr 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:14664 Archived-At: ------=_Part_6905_1201651892.1416525460885 Content-Type: multipart/alternative; boundary="----=_Part_6906_2129725851.1416525460891" ------=_Part_6906_2129725851.1416525460891 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable Le vendredi 21 novembre 2014 00:15:54 UTC+1, corentin....@cea.fr a =C3=A9cr= it : > > Le jeudi 20 novembre 2014 23:56:12 UTC+1, Matthew Woehlke a =C3=A9crit : >> >> On 2014-11-20 17:36, Richard Smith wrote:=20 >> > A variant of the 'inline variables and encapsulated expressions'=20 >> proposal=20 >> > would allow this:=20 >> >=20 >> > class X {=20 >> > int private_x;=20 >> > public:=20 >> > using public_x =3D +private_x;=20 >> > };=20 >> > X x;=20 >> > int a =3D x.public_x; // ok, means the same thing as 'int a =3D=20 >> +x.private_x;'=20 >> > but access check is done inside X.=20 >> >> How would you achieve this for a member of, say, a container type? (In= =20 >> my specific case, I have something like std::vector...)=20 >> >> --=20 >> Matthew=20 >> >> > using public_x =3D static_cast(private_x); ?=20 > Sorry, typing too fast: using public_x =3D const_cast(private_x); ? =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. Visit this group at http://groups.google.com/a/isocpp.org/group/std-proposa= ls/. ------=_Part_6906_2129725851.1416525460891 Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: quoted-printable
Le vendredi 21 novembre 2014 00:15:54 UTC+1, corentin....@= cea.fr a =C3=A9crit :
Le jeudi 20 novembre 2014 23:56:12 UTC+1, Matthew Woehlke a = =C3=A9crit :
On 2014-11-20 17:3= 6, Richard Smith wrote:
> A variant of the 'inline variables and encapsulated expressions' p= roposal
> would allow this:
>=20
> class X {
>   int private_x;
> public:
>   using public_x =3D +private_x;
> };
> X x;
> int a =3D x.public_x; // ok, means the same thing as 'int a =3D +x= ..private_x;'
> but access check is done inside X.

How would you achieve this for a member of, say, a container type? (In
my specific case, I have something like std::vector<Bar>...)

--=20
Matthew


using public_x =3D static_cast<const decltype(= x)&>(private_x); ?

Sorry, typi= ng too fast:
using public_x =3D const_cast<const decltype(private_x)&= amp;>(private_x); ? 

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