220 11618 <0329E32D-0EC2-4BE0-85D0-492A4CF22B0B@gmail.com> article Path: news.gmane.org!not-for-mail From: David Krauss Newsgroups: gmane.comp.lang.c++.isocpp.proposals Subject: Re: Controversy and debate: Uninitialized variables by default is a bug Date: Mon, 30 Jun 2014 23:52:34 +0800 Lines: 27 Approved: news@gmane.org Message-ID: <0329E32D-0EC2-4BE0-85D0-492A4CF22B0B@gmail.com> References: <60caa4ef-b32d-40fe-97b6-8918fbb2bd51@isocpp.org> <20140620202026.GA29898@bacon.lysator.liu.se> Reply-To: std-proposals@isocpp.org NNTP-Posting-Host: plane.gmane.org Mime-Version: 1.0 (Mac OS X Mail 7.3 \(1878.2\)) Content-Type: text/plain; charset=ISO-8859-1 X-Trace: ger.gmane.org 1404143586 30596 80.91.229.3 (30 Jun 2014 15:53:06 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Mon, 30 Jun 2014 15:53:06 +0000 (UTC) To: std-proposals@isocpp.org Original-X-From: std-proposals+bncBCW25A7E3QCRBS4PY2OQKGQEDBKKU7Y@isocpp.org Mon Jun 30 17:52:59 2014 Return-path: Envelope-to: gclcip-std-proposals@m.gmane.org Original-Received: from mail-pd0-f199.google.com ([209.85.192.199]) by plane.gmane.org with esmtp (Exim 4.69) (envelope-from ) id 1X1dsr-00059Y-TH for gclcip-std-proposals@m.gmane.org; Mon, 30 Jun 2014 17:52:46 +0200 Original-Received: by mail-pd0-f199.google.com with SMTP id r10sf39975412pdi.10 for ; Mon, 30 Jun 2014 08:52:44 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:mime-version:subject:from:in-reply-to:date :message-id:references:to:x-original-sender :x-original-authentication-results:reply-to:precedence:mailing-list :list-id:list-post:list-help:list-archive:list-subscribe :list-unsubscribe:content-type; bh=SZdH9QHvtxKVQgy1vVKUGzZ4FAH7252f/8YQv5+KMNU=; b=bdyAk3KwgkcLNZEhndHLJdUX95fh/DjwCGvTAKhmybryt4HePHjl3U6O5OdWC2WuEj /dncqvF53EPcH1/CXAf/oswmcFn7qVc+pyzcaxjM1JehTY3yJOtgxwHfGAvZSpwPjFtl /T3SOYTJb5A0RF1SNfhTjwb82p0TancOWn1ps5yDzLbMijFv6zFjhazSD4AesLNXyMz7 dYpWcfppKO0itlsiXbYbsRADsqYsb91zIqOcmSioa8s0DjKu0u5gqfPXrkfmV3SJFX2U yfqACzfeMiEDvGCYQyir5maL4DDVZDkyqLUdLM/u9LUByUGO/W7/HdXrFYPwxZLos0f4 c+eg== X-Gm-Message-State: ALoCoQkqGjs2HCmjfkK74jcUCjAl/f9hFsdm7NZjtyJinJzwTNELDoqHmmPGA1xGSreb0QR2+kmz X-Received: by 10.66.160.34 with SMTP id xh2mr21849576pab.6.1404143564647; Mon, 30 Jun 2014 08:52:44 -0700 (PDT) X-BeenThere: std-proposals@isocpp.org Original-Received: by 10.50.136.168 with SMTP id qb8ls1719510igb.43.gmail; Mon, 30 Jun 2014 08:52:42 -0700 (PDT) X-Received: by 10.42.67.203 with SMTP id u11mr39270106ici.20.1404143562843; Mon, 30 Jun 2014 08:52:42 -0700 (PDT) Original-Received: from mail-ig0-x236.google.com (mail-ig0-x236.google.com [2607:f8b0:4001:c05::236]) by mx.google.com with ESMTPS id r10si30032564ico.103.2014.06.30.08.52.42 for (version=TLSv1 cipher=ECDHE-RSA-RC4-SHA bits=128/128); Mon, 30 Jun 2014 08:52:42 -0700 (PDT) Received-SPF: pass (google.com: domain of potswa@gmail.com designates 2607:f8b0:4001:c05::236 as permitted sender) client-ip=2607:f8b0:4001:c05::236; Original-Received: by mail-ig0-f182.google.com with SMTP id l13so4420795iga.9 for ; Mon, 30 Jun 2014 08:52:42 -0700 (PDT) X-Received: by 10.50.55.66 with SMTP id q2mr33826433igp.11.1404143562732; Mon, 30 Jun 2014 08:52:42 -0700 (PDT) Original-Received: from [172.20.10.2] ([121.54.44.92]) by mx.google.com with ESMTPSA id d4sm5623660igc.5.2014.06.30.08.52.40 for (version=TLSv1 cipher=ECDHE-RSA-RC4-SHA bits=128/128); Mon, 30 Jun 2014 08:52:42 -0700 (PDT) In-Reply-To: <20140620202026.GA29898@bacon.lysator.liu.se> X-Mailer: Apple Mail (2.1878.2) X-Original-Sender: potswa@gmail.com X-Original-Authentication-Results: mx.google.com; spf=pass (google.com: domain of potswa@gmail.com designates 2607:f8b0:4001:c05::236 as permitted sender) smtp.mail=potswa@gmail.com; dkim=pass header.i=@gmail.com; dmarc=pass (p=NONE dis=NONE) header.from=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:11618 Archived-At: On 2014-06-21, at 4:20 AM, Magnus Fromreide wrote: > That would probably require some way to detect explicit-non-initialization > in order to support > > std::vector v(MEGABYTE, __no_init__); // a megabyte vector with > // unspecified content > > which seems like a natural extension if explicit non-initialization is > added to the language. __no_init__ (or uninitialized, or whatever) could be like nullptr, a sole value of its type. A library-only solution (with conversion functions) would even be workable, but for the fact that you cannot copy an uninitialized object. It sounds like a nice core language extension. -- --- 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 email 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-proposals/. .