220 2767 article Path: news.gmane.org!not-for-mail From: Tony V E Newsgroups: gmane.comp.lang.c++.isocpp.proposals Subject: optional -- errata Date: Thu, 7 Feb 2013 14:24:18 -0500 Lines: 168 Approved: news@gmane.org Message-ID: Reply-To: std-proposals@isocpp.org NNTP-Posting-Host: plane.gmane.org Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 X-Trace: ger.gmane.org 1360265066 5850 80.91.229.3 (7 Feb 2013 19:24:26 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Thu, 7 Feb 2013 19:24:26 +0000 (UTC) To: std-proposals@isocpp.org Original-X-From: std-proposals+bncBCUZ5QWKNQIOH7WPRACRUBEMI5ATI@isocpp.org Thu Feb 07 20:24:46 2013 Return-path: Envelope-to: gclcip-std-proposals@m.gmane.org Original-Received: from mail-ia0-f200.google.com ([209.85.210.200]) by plane.gmane.org with esmtp (Exim 4.69) (envelope-from ) id 1U3X5L-0001Xt-IS for gclcip-std-proposals@m.gmane.org; Thu, 07 Feb 2013 20:24:39 +0100 Original-Received: by mail-ia0-f200.google.com with SMTP id o25sf4216486iad.3 for ; Thu, 07 Feb 2013 11:24:20 -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:date:message-id:subject:from:to :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; bh=O6Ee3GcpGLvkZU12AxhRoJ2xQQjkaROhSGBT34PtD2I=; b=wzZqUivKvuOOgsaiYMsyTLDL3lxhZ3TkJQ7c24ecAxR4+VE2p7BohcLTqrqk2Ns65C eoOh3/J0mwH70wblFWKzO80SFStNSyswd+zj+La1Rzdn8keWeyusCVhY4lVqv0bmwhI3 7Z7ZsFv936YrWOBtNw6maCfVxLS5q4EcnRTzJvMkbhHmoNf+cqg7BMX1CVdKL67CQxf4 JzHgjyS9rA5r3buE/fCpilTjjG+1DnM1IdjiSvrlLPJNmCULYI9kO1fcAZSJ1wEUWzI3 IH/GOBssEmYxVv2r/H1M/ffEebDFybUjGUBZu1QPl52XT5ljTSR7ie2X+9mjuDW3oU7n dJNA X-Received: by 10.182.212.37 with SMTP id nh5mr325065obc.20.1360265060003; Thu, 07 Feb 2013 11:24:20 -0800 (PST) X-BeenThere: std-proposals@isocpp.org Original-Received: by 10.182.250.83 with SMTP id za19ls146470obc.63.gmail; Thu, 07 Feb 2013 11:24:19 -0800 (PST) X-Received: by 10.60.1.225 with SMTP id 1mr2044665oep.141.1360265059032; Thu, 07 Feb 2013 11:24:19 -0800 (PST) X-Received: by 10.60.1.225 with SMTP id 1mr2044664oep.141.1360265059017; Thu, 07 Feb 2013 11:24:19 -0800 (PST) Original-Received: from mail-ob0-f169.google.com (mail-ob0-f169.google.com [209.85.214.169]) by mx.google.com with ESMTPS id h4si29009177obn.44.2013.02.07.11.24.18 (version=TLSv1 cipher=ECDHE-RSA-RC4-SHA bits=128/128); Thu, 07 Feb 2013 11:24:19 -0800 (PST) Received-SPF: pass (google.com: domain of tvaneerd@gmail.com designates 209.85.214.169 as permitted sender) client-ip=209.85.214.169; Original-Received: by mail-ob0-f169.google.com with SMTP id ta14so3082400obb.28 for ; Thu, 07 Feb 2013 11:24:18 -0800 (PST) X-Received: by 10.182.8.70 with SMTP id p6mr2048687oba.90.1360265058841; Thu, 07 Feb 2013 11:24:18 -0800 (PST) Original-Received: by 10.182.126.130 with HTTP; Thu, 7 Feb 2013 11:24:18 -0800 (PST) X-Original-Sender: tvaneerd@gmail.com X-Original-Authentication-Results: mx.google.com; spf=pass (google.com: domain of tvaneerd@gmail.com designates 209.85.214.169 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:2767 Archived-At: Since I was reading through the proposal anyhow, I jotted down some small stuff as I went along. Hopefully if you search for each snippet I quote, you can find it in your doc. ------- "Any valid initialization scheme must provide a way to put an optional objects to any of these states" objects -> object ------- It becomes even ore useful in copy-initialization contextx like returning values from functions contextx -> context ------- However, that causes first the creation od disengaged optional, and then copying it multiple times od -> of and again: lack od default constructor ------- if (opt2 == {}) ... // ilegal ilegal -> illegal ------- unclear if the author did not really intend to comare two T's. comare -> compare ------- With additional requirement that optional's move constructor should not be trivial -> With *the* additional requirement... ------- This controversy is charachteristic not only of optional. charachteristic -> characteristic ------- Returning lvalue reference might prevent move optimizationreturning an rvalue -> optimization; returning ------- painfully_compte_default -> painfully_compute_default (in a few places) ------- diverge from one another in terms of the interface: mpart pointers have ptr mpart -> smart ------- We chose not topropose it. ------- Undoubtadly, it spares you from an explicit if-statement and a two-phase initialization -> Undoubtedly ------- The address stored by the optional object can be canged or set to a value that does not represent a valid address. canged -> changed ------- or a possibli cv-qualified reference possibly ------- Being engaged or disengaged is part of the state optional object's state. -> Being engaged or disengaged is part of the optional object's state. ------- The reson to provide such genereic assignment -> generic ------- with forwarded argument pack as parameters. with the forwarded argument pack as parameters. ------- Tony -- --- You received this message because you are subscribed to the Google Groups "ISO C++ Standard - Future Proposals" group. 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