220 19956 article Path: news.gmane.org!not-for-mail From: NDos Dannyu Newsgroups: gmane.comp.lang.c++.isocpp.proposals Subject: Re: Address of a reference: determining the value category of what it refers? Date: Fri, 21 Aug 2015 19:42:13 -0700 (PDT) Lines: 125 Approved: news@gmane.org Message-ID: References: <76fe342f-3342-4355-af20-1c41b21e54aa@isocpp.org> <3183929.eXnTES4BH3@tjmaciei-mobl4> Reply-To: std-proposals@isocpp.org NNTP-Posting-Host: plane.gmane.org Mime-Version: 1.0 Content-Type: multipart/mixed; boundary="----=_Part_53_1393151064.1440211333630" X-Trace: ger.gmane.org 1440211337 10231 80.91.229.3 (22 Aug 2015 02:42:17 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Sat, 22 Aug 2015 02:42:17 +0000 (UTC) To: ISO C++ Standard - Future Proposals Original-X-From: std-proposals+bncBCX7FRO67EHRBB6D36XAKGQEC3PU7XY@isocpp.org Sat Aug 22 04:42:17 2015 Return-path: Envelope-to: gclcip-std-proposals@m.gmane.org Original-Received: from mail-qk0-f199.google.com ([209.85.220.199]) by plane.gmane.org with esmtp (Exim 4.69) (envelope-from ) id 1ZSyl6-000257-JF for gclcip-std-proposals@m.gmane.org; Sat, 22 Aug 2015 04:42:16 +0200 Original-Received: by qkep139 with SMTP id p139sf114817716qke.1 for ; Fri, 21 Aug 2015 19:42:15 -0700 (PDT) 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:message-id:in-reply-to:references :subject:mime-version:content-type: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=GmnQ59hcr3T2Iuj0AnDZwPBMuvTWd4ul6afiFATYlHc=; b=FLor6i6+z5i50IldsgiQJLpHKC3xTX8LOtdnaytW3FdGoIXdjaeCi/ZcN81+foXZ1a HnY5gh3CQSXBFzD3iOn4iSABxsfLiHO2Fh/dGfSGVvN29SZCF8yUyb9S4vAMPzvCX0/6 +IA68a9LLqzrMVdSfHIrKyO5ePWhzfXMYVdmRgxEtzLhuz8Jqx1dVVCy26ayZhW1YrnZ hK+1VklaWsvHLMvCyZ3ybaDNeRz/2br2VK6R28TJy3nrFrMRrmmlAYPYSS3YBG2Ir67Z YO2wDLuuIqkmCYumierx0Y6xJjbdUQqKOnIH+jHbcsz6eBBhysYGipBghVPn3cQpKj3J 6wUQ== X-Gm-Message-State: ALoCoQmzKaYQKSPhfW7GgnocwZLD6JWn1HiFqFu9WhSu9F6tdl3nrg4dvydh0qCtMgrIPZdcQuyR X-Received: by 10.140.150.14 with SMTP id 14mr9402334qhw.0.1440211335813; Fri, 21 Aug 2015 19:42:15 -0700 (PDT) X-BeenThere: std-proposals@isocpp.org Original-Received: by 10.50.108.7 with SMTP id hg7ls664605igb.37.gmail; Fri, 21 Aug 2015 19:42:15 -0700 (PDT) X-Received: by 10.50.119.102 with SMTP id kt6mr117420igb.13.1440211334971; Fri, 21 Aug 2015 19:42:14 -0700 (PDT) In-Reply-To: <3183929.eXnTES4BH3@tjmaciei-mobl4> X-Original-Sender: ndospark320@naver.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:19956 Archived-At: ------=_Part_53_1393151064.1440211333630 Content-Type: multipart/alternative; boundary="----=_Part_54_312722975.1440211333637" ------=_Part_54_312722975.1440211333637 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable 2015=EB=85=84 8=EC=9B=94 22=EC=9D=BC =ED=86=A0=EC=9A=94=EC=9D=BC =EC=98=A4= =EC=A0=84 11=EC=8B=9C 24=EB=B6=84 55=EC=B4=88 UTC+9, Thiago Macieira =EB=8B= =98=EC=9D=98 =EB=A7=90: > > > You're saying that the function doit above should return null if it was= =20 > called=20 > with a reference to a temporary. But if it does so, how will it print the= =20 > value that was referenced?=20 > Does printf need its address??=20 > Besides, we're missing an important aspect: why do you want this? What's= =20 > the=20 > motivation?=20 > I'm writing my story again: I have a value class indicating a finite discrete random variable. But I had a problem. For example, assume that I have a variable named X. But how can P(X

2015=EB=85=84 8=EC=9B=94 22=EC=9D=BC =ED=86=A0=EC= =9A=94=EC=9D=BC =EC=98=A4=EC=A0=84 11=EC=8B=9C 24=EB=B6=84 55=EC=B4=88 UTC+= 9, Thiago Macieira =EB=8B=98=EC=9D=98 =EB=A7=90:
Besides, we're missing an important aspect: why = do you want this? What's the=20
motivation?
I'm writing my story again:
I ha= ve a value class indicating a finite discrete random variable.
=
But I had a problem. For example, assume that=C2=A0I have a variable n= amed X.
But=C2=A0how=C2=A0can=C2=A0P(X<X=C2=B2) interpreted? X= is still X, even it is squared, isn't it?
Things will get mu= ch more complicated if=C2=A0I have multiple variables, X, Y and Z,
and I have to do like P(X<X=C2=B2=3DY>|Z|) or something.=C2=A0
So I decided to=C2=A0make a bind of variables.
It would be = a tree structure, consisting of=C2=A0other=C2=A0binds=C2=A0or variables.
If=C2=A0it=C2=A0consists=C2=A0of references of variables, it will k= now what variables are same(or dependant) and=C2=A0what variables are diffe= rent(or indepentant).
But=C2=A0how can I deal with rvalues?=C2=A0= For examples, 1 can be seen as a variable which is always 1.
But = it has=C2=A0no name. It is just 1. It=C2=A0is always indepentant from other= =C2=A0variables.
So I=C2=A0made it=C2=A0to consist of const lvalu= e references, which=C2=A0can=C2=A0initialized=C2=A0with lvalue or rvalue.
But=C2=A0how can I determine it=C2=A0refers to lvalue or rvalue?? = I couldn't find any solution from the standard library.

--

---
You received this message because you are subscribed to the Google Groups &= quot;ISO C++ Standard - Future Proposals" group.
To unsubscribe from this group and stop receiving emails from it, send an e= mail to std-proposa= ls+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-proposals/<= /a>.
------=_Part_54_312722975.1440211333637-- ------=_Part_53_1393151064.1440211333630-- .