220 23759 article Path: news.gmane.org!not-for-mail From: Zhihao Yuan Newsgroups: gmane.comp.lang.c++.isocpp.proposals Subject: Re: Allowing uncopyable allocators Date: Sun, 17 Jan 2016 01:38:35 -0600 Lines: 28 Approved: news@gmane.org Message-ID: References: <657cb0a7-4854-41c6-963f-5a11cc677157@isocpp.org> <1c315b77-38b7-46b8-8105-2703b4dccb6d@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 X-Trace: ger.gmane.org 1453016327 24687 80.91.229.3 (17 Jan 2016 07:38:47 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Sun, 17 Jan 2016 07:38:47 +0000 (UTC) To: "std-proposals@isocpp.org" Original-X-From: std-proposals+bncBCSKRWMD4EHBB7EJ5W2AKGQEBG4DJRY@isocpp.org Sun Jan 17 08:38:39 2016 Return-path: Envelope-to: gclcip-std-proposals@m.gmane.org Original-Received: from mail-io0-f197.google.com ([209.85.223.197]) by plane.gmane.org with esmtp (Exim 4.69) (envelope-from ) id 1aKhv4-00061D-VE for gclcip-std-proposals@m.gmane.org; Sun, 17 Jan 2016 08:38:39 +0100 Original-Received: by mail-io0-f197.google.com with SMTP id q21sf1330523001iod.3 for ; Sat, 16 Jan 2016 23:38:38 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=miator-net.20150623.gappssmtp.com; s=20150623; h=sender:mime-version:in-reply-to:references:date:message-id:subject :from:to:content-type:x-original-sender :x-original-authentication-results:reply-to:precedence:mailing-list :list-id:x-spam-checked-in-group:list-post:list-help:list-archive :list-subscribe:list-unsubscribe; bh=5nGk9/xs3JK+lqFp4sJdX9me5qnM3AbZ91VwgHVcKUc=; b=iic6Ioc3FyK5T17MOZ1NnRXr/xy0HwmPypj6R6t75+nF4x3oKeGyHMWTSv70vfyk61 DrDr3ns5C/V0Utnxb+WbCkhS8BkwcThzttdE+khVeOIvIeXmoVO27dTyWb1tg9kjOo8G iE8qmBdFO7EzAC8merfCeNhwt4ksqa24ioHHN3JOXL1f5FUB/qHkI9XRck5TXUpVkTrX aOTK71HR2oVXtIuPqKoAZrrkvEMLXniN4+JTG2BOMChxQtMKpgIzO4jKwCUhqlx4hW/L 8OKrcPM3cTEK2pv2+osTLNLY7HR4xhT/9IuVmYeuP4Zy4FUx2yUgQRo/TjHPFvO3ybC2 7hFA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:sender:mime-version:in-reply-to:references:date :message-id:subject:from:to:content-type:x-original-sender :x-original-authentication-results:reply-to:precedence:mailing-list :list-id:x-spam-checked-in-group:list-post:list-help:list-archive :list-subscribe:list-unsubscribe; bh=5nGk9/xs3JK+lqFp4sJdX9me5qnM3AbZ91VwgHVcKUc=; b=UkMvclqmhMvFCNmNNl6fwqlVibwfj/RR2wxbh/QtfzWwQO7KVdpoO5azY+39txjnRb sb027ZTwtiPB7cNRPjkzTaTN+mPDV58CB+t+gcGFsZMncC4jlntE4A5fEdcYrVvQNWLf vlig/zrKWZhKnUZDwJyXUd14edwDwVr5KnlzAsGyynUSJs+5G+FJKFs48wSDAbbyzQE/ y6qK4HeKlDvH9mLAofqCYigAGKv4n4E82p9ehlZt0DOOTr552fTEmp4BZ64JthXTDO78 /1rk/aibPn4tTBQ3BcDlw/kGcGNuF0v7AS0gvqfrQ7IObgUIG3fjTFILo+/U/2UK8U4i +Cig== X-Gm-Message-State: ALoCoQlotP7bfkz+tgRtO/c84/RfZZJuoo62J9Mk5YOtR/BlxHy33rHUhWumMb1saOYgdEcP7XUVxbXgKGbNDkz0NCf24GebSw== X-Received: by 10.107.155.84 with SMTP id d81mr17163963ioe.27.1453016317905; Sat, 16 Jan 2016 23:38:37 -0800 (PST) X-BeenThere: std-proposals@isocpp.org Original-Received: by 10.140.94.238 with SMTP id g101ls1760779qge.57.gmail; Sat, 16 Jan 2016 23:38:36 -0800 (PST) X-Received: by 10.55.22.9 with SMTP id g9mr23505587qkh.12.1453016316043; Sat, 16 Jan 2016 23:38:36 -0800 (PST) Original-Received: from mail-s68.mailgun.info (mail-s68.mailgun.info. [184.173.153.196]) by mx.google.com with ESMTPS id z17si23974861qka.125.2016.01.16.23.38.35 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Sat, 16 Jan 2016 23:38:35 -0800 (PST) Received-SPF: pass (google.com: domain of bounce+3f9131.69110-std-proposals=isocpp.org@miator.net designates 184.173.153.196 as permitted sender) client-ip=184.173.153.196; Original-Sender: zy@miator.net X-Mailgun-Sid: WyI3MTBkYiIsICJzdGQtcHJvcG9zYWxzQGlzb2NwcC5vcmciLCAiNjkxMTAiXQ== Original-Received: from mail-io0-f170.google.com (mail-io0-f170.google.com [209.85.223.170]) by mxa.mailgun.org with ESMTP id 569b44fb.7f02fd1034b0-in02; Sun, 17 Jan 2016 07:38:35 -0000 (UTC) Original-Received: by mail-io0-f170.google.com with SMTP id q21so523698593iod.0 for ; Sat, 16 Jan 2016 23:38:35 -0800 (PST) X-Received: by 10.107.8.20 with SMTP id 20mr19376792ioi.34.1453016315414; Sat, 16 Jan 2016 23:38:35 -0800 (PST) Original-Received: by 10.79.31.130 with HTTP; Sat, 16 Jan 2016 23:38:35 -0800 (PST) In-Reply-To: <1c315b77-38b7-46b8-8105-2703b4dccb6d@isocpp.org> X-Gmail-Original-Message-ID: X-Original-Sender: zy@miator.net X-Original-Authentication-Results: mx.google.com; spf=pass (google.com: domain of bounce+3f9131.69110-std-proposals=isocpp.org@miator.net designates 184.173.153.196 as permitted sender) smtp.mailfrom=bounce+3f9131.69110-std-proposals=isocpp.org@miator.net; dkim=pass header.i=@miator.net 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:23759 Archived-At: On Sun, Jan 17, 2016 at 12:36 AM, wrote: > Even if copy elision is mandatory under certain circumstances, this doesn't > change the fact that a conforming implementation is free to copy around > allocators as much as it wants, because a conforming allocator has to be > copy constructible. I see where the "problem" is. But this will require changing all functions taking a default constructed allocator as const& in the signatures. And you need to convince people about why it's useful. To me, only polymorphic memory resource is useful; other people may have different opinions. -- Zhihao Yuan, ID lichray The best way to predict the future is to invent it. ___________________________________________________ 4BSD -- http://bit.ly/blog4bsd -- --- 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 https://groups.google.com/a/isocpp.org/group/std-proposals/. .