220 2740 article Path: news.gmane.org!not-for-mail From: Tony V E Newsgroups: gmane.comp.lang.c++.isocpp.proposals Subject: Re: optional references -- take 2 Date: Tue, 5 Feb 2013 12:23:44 -0500 Lines: 49 Approved: news@gmane.org Message-ID: References: <8d57e9e9-e4cc-441c-abeb-e6526531fad5@isocpp.org> Reply-To: std-proposals@isocpp.org NNTP-Posting-Host: plane.gmane.org Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable X-Trace: ger.gmane.org 1360085026 3126 80.91.229.3 (5 Feb 2013 17:23:46 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Tue, 5 Feb 2013 17:23:46 +0000 (UTC) Cc: Sean Parent To: std-proposals@isocpp.org Original-X-From: std-proposals+bncBCUZ5QWKNQIKBAGFRACRUBGGYAV4A@isocpp.org Tue Feb 05 18:24:06 2013 Return-path: Envelope-to: gclcip-std-proposals@m.gmane.org Original-Received: from mail-vc0-f198.google.com ([209.85.220.198]) by plane.gmane.org with esmtp (Exim 4.69) (envelope-from ) id 1U2mFY-0002OB-8L for gclcip-std-proposals@m.gmane.org; Tue, 05 Feb 2013 18:24:04 +0100 Original-Received: by mail-vc0-f198.google.com with SMTP id m8sf476813vcd.9 for ; Tue, 05 Feb 2013 09:23:45 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=x-received:x-beenthere:x-received:x-received:received-spf :mime-version:x-received:in-reply-to:references:date:message-id :subject:from:to:cc:x-original-sender :x-original-authentication-results:reply-to:precedence:mailing-list :list-id:x-google-group-id:list-post:list-help:list-archive :list-subscribe:list-unsubscribe:content-type :content-transfer-encoding; bh=2TiSi22TUWDx7JjBo0JaUknYm2y3/wYp3YKpxwpdSyU=; b=N0UnBLb6WCA517wFNYytm471410TfV5mbUJOen3XTeFTkkbiD1MY1H8bBu/VfMcat9 a+5f12PK1KBS5AsoUjz4nL9xOgr/U6TfiTUqaoH1irPSSS0dDOrvZk4A/Co3MkJAqerC wlpRr1T9zBnIMVMx94A5ITxmBceTlUaB+GUE14ADlWPziX2Pxz0kiVi6lzc6j7ehZXAn 4iRtIcUZzZPwECE1jhhp4FN7aQGTPUhP+7kW3+EplMImdNAOLJFOOQ/WdTx62Vp7GqsR cpdOqD5gky X-Received: by 10.236.132.104 with SMTP id n68mr11474814yhi.37.1360085025121; Tue, 05 Feb 2013 09:23:45 -0800 (PST) X-BeenThere: std-proposals@isocpp.org Original-Received: by 10.49.35.49 with SMTP id e17ls57341qej.59.gmail; Tue, 05 Feb 2013 09:23:44 -0800 (PST) X-Received: by 10.49.108.9 with SMTP id hg9mr22936429qeb.34.1360085024585; Tue, 05 Feb 2013 09:23:44 -0800 (PST) X-Received: by 10.49.108.9 with SMTP id hg9mr22936427qeb.34.1360085024534; Tue, 05 Feb 2013 09:23:44 -0800 (PST) Original-Received: from mail-qe0-f48.google.com (mail-qe0-f48.google.com [209.85.128.48]) by mx.google.com with ESMTPS id q4si5538886qct.177.2013.02.05.09.23.44 (version=TLSv1 cipher=ECDHE-RSA-RC4-SHA bits=128/128); Tue, 05 Feb 2013 09:23:44 -0800 (PST) Received-SPF: pass (google.com: domain of tvaneerd@gmail.com designates 209.85.128.48 as permitted sender) client-ip=209.85.128.48; Original-Received: by mail-qe0-f48.google.com with SMTP id 3so200635qea.21 for ; Tue, 05 Feb 2013 09:23:44 -0800 (PST) X-Received: by 10.224.146.136 with SMTP id h8mr19864669qav.97.1360085024415; Tue, 05 Feb 2013 09:23:44 -0800 (PST) Original-Received: by 10.49.87.168 with HTTP; Tue, 5 Feb 2013 09:23:44 -0800 (PST) In-Reply-To: <8d57e9e9-e4cc-441c-abeb-e6526531fad5@isocpp.org> X-Original-Sender: tvaneerd@gmail.com X-Original-Authentication-Results: mx.google.com; spf=pass (google.com: domain of tvaneerd@gmail.com designates 209.85.128.48 as permitted sender) smtp.mail=tvaneerd@gmail.com; dkim=pass header.i=@gmail.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:2740 Archived-At: On Mon, Feb 4, 2013 at 2:23 PM, Andrzej Krzemie=C5=84ski wrote: >> > I wanted to consult with people here one more thing about mixed relops= .. >> > Assuming that we allow mixed relops for optional values, should we als= o >> > provide them for optional references? >> > >> > int i =3D 9; >> > optional oi =3D i; >> > return oi =3D=3D i; // should it work? >> > >> >> Just to be clear, does it compare the values, or the ref? > > > The values. > > > > mixed assignment is illegal. Use one of the following instead: > > *oi =3D j; // if you want to alter the referred-to object > oi =3D {j}; // if you want to rebind a reference > >> > > Copy constructor and copy assignment are shallow: they only (re)bind a > reference. Other operations are deep: this includes comparison (mixed or > homogenous) > Is optional a RegularType? Tony --=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/?hl=3Den. .