220 10515 article Path: news.gmane.org!not-for-mail From: Nevin Liber Newsgroups: gmane.comp.lang.c++.isocpp.proposals Subject: Re: get_deleter_type_info Date: Mon, 5 May 2014 12:42:13 -0500 Lines: 110 Approved: news@gmane.org Message-ID: References: <2219117.8dN8m88Reg@tjmaciei-mobl4> Reply-To: std-proposals@isocpp.org NNTP-Posting-Host: plane.gmane.org Mime-Version: 1.0 Content-Type: multipart/alternative; boundary=f46d043c7ffe2fab0604f8aaa9a6 X-Trace: ger.gmane.org 1399405531 3018 80.91.229.3 (6 May 2014 19:45:31 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Tue, 6 May 2014 19:45:31 +0000 (UTC) To: "std-proposals@isocpp.org" Original-X-From: std-proposals+bncBCE35H5S6IDBBHU3T6NQKGQE4F3TEMQ@isocpp.org Tue May 06 21:45:24 2014 Return-path: Envelope-to: gclcip-std-proposals@m.gmane.org Original-Received: from mail-wi0-f199.google.com ([209.85.212.199]) by plane.gmane.org with esmtp (Exim 4.69) (envelope-from ) id 1WhkH4-00085g-H5 for gclcip-std-proposals@m.gmane.org; Tue, 06 May 2014 20:39:30 +0200 Original-Received: by mail-wi0-f199.google.com with SMTP id hm4sf19839wib.10 for ; Tue, 06 May 2014 11:39:30 -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:sender:in-reply-to:references:from :date:message-id:subject: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=v6rmmaSlpKk6M0cDwYgffJqlg1jBd9VGoAiVZX6OKnc=; b=LwwbsV9Ll+dbTAEIkq7YB3szSScySd4IGXcK2p3T5YX3xEBlp1JFY1wK2p+OxxkyuR IG0KRCFzUr1L0o93ZfL5DrrGelvKDIkOz/Qv4loLtC+7dDgCooOzqhbVwgXMdeCwrm2O 7xMAwqV4sYz+2S8MbsZ72DPKqjKms+ktS7rdot3TFVnHPMmd+Wmxq1jy2QjVPwh3QJIb ZWQwGD7hUhQs6Gs1kjJGRI3y33TVilq/BB54mTVJSkVZy47IIooSTCkLF/rZv2kFOgfi NzzhPBFxEspWxPlJo0WlMtArgg8DbkgSoprjIXriDG/ZRwao8i7VAI+0HAoEmaci9Ikn bdnQ== X-Gm-Message-State: ALoCoQkT7Dri10YLvN4ZmRmYZ7/hSYZwsfz2jqd+xAgpzrvfmYEr8x4vEo6F8hFPc1AAAHKqcpZO X-Received: by 10.180.211.102 with SMTP id nb6mr1640222wic.1.1399311825022; Mon, 05 May 2014 10:43:45 -0700 (PDT) X-BeenThere: std-proposals@isocpp.org Original-Received: by 10.180.94.198 with SMTP id de6ls465133wib.21.canary; Mon, 05 May 2014 10:42:53 -0700 (PDT) X-Received: by 10.180.94.37 with SMTP id cz5mr17061439wib.19.1399311773842; Mon, 05 May 2014 10:42:53 -0700 (PDT) Original-Received: from mail-wg0-x22e.google.com (mail-wg0-x22e.google.com [2a00:1450:400c:c00::22e]) by mx.google.com with ESMTPS id lj4si4571454wjc.134.2014.05.05.10.42.53 for (version=TLSv1 cipher=ECDHE-RSA-RC4-SHA bits=128/128); Mon, 05 May 2014 10:42:53 -0700 (PDT) Received-SPF: pass (google.com: domain of nliber@gmail.com designates 2a00:1450:400c:c00::22e as permitted sender) client-ip=2a00:1450:400c:c00::22e; Original-Received: by mail-wg0-f46.google.com with SMTP id n12so5939905wgh.29 for ; Mon, 05 May 2014 10:42:53 -0700 (PDT) X-Received: by 10.180.93.101 with SMTP id ct5mr16978546wib.23.1399311773442; Mon, 05 May 2014 10:42:53 -0700 (PDT) Original-Sender: nliber@gmail.com Original-Received: by 10.194.121.165 with HTTP; Mon, 5 May 2014 10:42:13 -0700 (PDT) In-Reply-To: X-Original-Sender: nevin@eviloverlord.com X-Original-Authentication-Results: mx.google.com; spf=pass (google.com: domain of nliber@gmail.com designates 2a00:1450:400c:c00::22e as permitted sender) smtp.mail=nliber@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:10515 Archived-At: --f46d043c7ffe2fab0604f8aaa9a6 Content-Type: text/plain; charset=UTF-8 On 5 May 2014 12:27, Philipp Maximilian Stephani wrote: > > > On Mon May 05 2014 at 17:07:35, Nevin Liber > wrote: > >> On 5 May 2014 02:37, Matthew Fletcher <0xc0deface@gmail.com> wrote: >> >>> The use case where I am having problems is with serialisation of >>> shared_ptr. >>> >> >> Just serializing the deleter isn't sufficient; for correctness you also >> need to serialize the allocation method (both the object and the deleter >> may be dependent upon it), which isn't directly stored with the shared_ptr. >> >> > The allocator is used to deallocate the control block, so I think it needs > to be stored as well. > When a custom deleter is being used (the OP case), the shared_ptr has no idea where the allocation comes from, because all that is passed to its constructor is a raw pointer. -- Nevin ":-)" Liber (847) 691-1404 -- --- You received this message because you are subscribed to the Google Groups "ISO C++ Standard - Future Proposals" group. 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On 5 May 2014 12:27, Philipp Maximilian Stephani <p.s= tephani2@gmail.com> wrote:


On Mon May 05 2014 at 17:07:3= 5, Nevin Liber <nevin@eviloverlord.com> wrote:
On 5 May 2014 02:37, Matthew Fletcher &l= t;0xc0deface@gmai= l.com> wrote:
The use case where I am having probl= ems is with serialisation of shared_ptr.

Just serializing the deleter isn't su= fficient; for correctness you also need to serialize the allocation method = (both the object and the deleter may be dependent upon it), which isn't= directly stored with the shared_ptr.


The allocator = is used to deallocate the control block, so I think it needs to be stored a= s well.

When a custom deleter is bein= g used (the OP case), the shared_ptr has no idea where the allocation comes= from, because all that is passed to its constructor is a raw pointer.
--
=C2=A0Nevin ":-)" Liber=C2=A0 <mailto:nevin@eviloverlord.com= >=C2=A0 (847) 691-1404

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