220 34974 <664105b3-ea68-4565-8017-a4893f4b38bf@isocpp.org> article Path: news.gmane.org!.POSTED!not-for-mail From: Mingxin Wang Newsgroups: gmane.comp.lang.c++.isocpp.proposals Subject: Re: Idea about "std::pmr::memory_resource" Date: Mon, 16 Oct 2017 18:29:15 -0700 (PDT) Lines: 65 Approved: news@gmane.org Message-ID: <664105b3-ea68-4565-8017-a4893f4b38bf@isocpp.org> References: <0a8293b4-3246-47a5-9881-bc1ca4b91772@isocpp.org> <07ddb1f6-d3af-43df-bf96-8975c1ab4313@isocpp.org> <2e191a96-1952-479b-b78b-22e31f8e03de@isocpp.org> <0e37b5ae-64f6-4a8a-86bd-f44b119ed40a@isocpp.org> <15f8c5ba-3a6a-4441-9620-92e157c66094@isocpp.org> <26fe4cb4-98ca-41cc-ac96-5c51851799d1@isocpp.org> <784ffce8-ace7-449d-a13d-a99d7336117a@isocpp.org> <6d0ad98b-87d5-43dd-ac54-2b7d3e03e31b@isocpp.org> <4af80cf7-244c-4137-9133-1a36a209e4ca@isocpp.org> <7f22751b-91d1-4de4-81d2-421046ceb963@isocpp.org> <68690e5c-f466-4fbe-ab41-80be58257259@isocpp.org> Reply-To: std-proposals@isocpp.org NNTP-Posting-Host: blaine.gmane.org Mime-Version: 1.0 Content-Type: multipart/mixed; boundary="----=_Part_18766_78233366.1508203755574" X-Trace: blaine.gmane.org 1508203760 31686 195.159.176.226 (17 Oct 2017 01:29:20 GMT) X-Complaints-To: usenet@blaine.gmane.org NNTP-Posting-Date: Tue, 17 Oct 2017 01:29:20 +0000 (UTC) To: ISO C++ Standard - Future Proposals Original-X-From: std-proposals+bncBDNMBNHJWIGBB3FZSXHQKGQEXJS5FBA@isocpp.org Tue Oct 17 03:29:14 2017 Return-path: Envelope-to: gclcip-std-proposals@m.gmane.org Original-Received: from mail-ua0-f199.google.com ([209.85.217.199]) by blaine.gmane.org with esmtp (Exim 4.84_2) (envelope-from ) id 1e4Ggw-00075L-PU for gclcip-std-proposals@m.gmane.org; Tue, 17 Oct 2017 03:29:10 +0200 Original-Received: by mail-ua0-f199.google.com with SMTP id d12sf107801uaj.18 for ; Mon, 16 Oct 2017 18:29:18 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=isocpp-org.20150623.gappssmtp.com; s=20150623; h=date:from:to:message-id:in-reply-to:references:subject:mime-version :x-original-sender:reply-to:precedence:mailing-list:list-id :list-post:list-help:list-archive:list-subscribe:list-unsubscribe; bh=Ih/j1L59qfSUTRtdwzqImCIxCSoJf6vAA7Ci0ceCNF0=; b=mVhKS+IiyzBQPhsxLlEz15LWsMGzOkH8mgE9FpJ6j2ZyXok9rgtIcjomym9w4UZuNj jWXNwpDRPKFy663ugGMPKMfT9AppfXnYPb3hAEEhA3t8//rsk3Gsf2OQTZ414aGbcqB5 4azKWzhxar9ooOqujg43rTE/R58p+HVTpgpqijzoP3YuInUfAziVqyt5ujrwbvJj5YOh miTYyX5Ezw/ZVBc5TI77wlRRdzu6PrGAtlG9G/Qymu1lteBsRXZP1mKTEo8s53yuCsQU /YH2eBvmcUApr0lfPpoPDWykZyyr1PcvHnLIJ8VIyrSg2eK3f47eYF0wa2ilLl0uZKmJ sUcA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:from:to:message-id:in-reply-to:references :subject:mime-version:x-original-sender:reply-to:precedence :mailing-list:list-id:x-spam-checked-in-group:list-post:list-help :list-archive:list-subscribe:list-unsubscribe; bh=Ih/j1L59qfSUTRtdwzqImCIxCSoJf6vAA7Ci0ceCNF0=; b=lG3l9vPnqZzcpZKgFL4oAPJr40G+Kec0RYe1eHvB5dT6+bEL3yQi0nzsT1YaPayYi8 taTpJFDaKEUwc8INJLPWMo1kpmbjWb2a4h2uB6kIz03Ux4NprhPR6i9N/BDz6wNG4oFe Nvd50vVHDNDkQInsG64vFW1530l06uTj9XnKqXJ33uGbmkFd25m5uAsPZ33ZiziSgBa/ zIe+W8XdYp4vG30Llea1OaZSq31hbLO3NSWq2LapXZ4VZvALN7kbmFyDhs/PYYB7Obdl AA8uB8TYm36/FVQnStzeeUqLMYsR5i0nRKxEYNu+V+mwr2HIZcyiRxaPhNEQ7fTVxmyV 2UWg== X-Gm-Message-State: AMCzsaX6bFpmwLn+dpqBDT+WDV348fFnBGYwzf60lkYHyDey1C84oiHb +XqfAzL6HqCvYuSenZ7qxcFqgA== X-Google-Smtp-Source: ABhQp+RFVML4xIQwoU5guKl2d7wQfIQoUW4U/hthFAS1do99DSszuPN86Ghr2ssei1BQXX6yS2u/sw== X-Received: by 10.176.78.12 with SMTP id g12mr4678550uah.67.1508203757948; Mon, 16 Oct 2017 18:29:17 -0700 (PDT) X-BeenThere: std-proposals@isocpp.org Original-Received: by 10.159.53.238 with SMTP id u43ls8558uad.11.gmail; Mon, 16 Oct 2017 18:29:16 -0700 (PDT) X-Received: by 10.31.153.21 with SMTP id b21mr870367vke.13.1508203756371; Mon, 16 Oct 2017 18:29:16 -0700 (PDT) In-Reply-To: <68690e5c-f466-4fbe-ab41-80be58257259@isocpp.org> X-Original-Sender: wmx16835vv@163.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:34974 Archived-At: ------=_Part_18766_78233366.1508203755574 Content-Type: multipart/alternative; boundary="----=_Part_18767_1033648290.1508203755574" ------=_Part_18767_1033648290.1508203755574 Content-Type: text/plain; charset="UTF-8" On Tuesday, October 17, 2017 at 1:39:33 AM UTC+8, Aleksey Loginov wrote: > > In other words, by hand-made RTTI, and only for fixed allocation > starategies (for example, data_ can not be a shared_ptr or cow_ptr) > There is NO RTTI in the implementation of "operator=". This operation is done via indirect function calls, and it is as efficient as most implementations of `std::any` from various vendors. `data_` is actually implementation detail, I don't know about your motivation that it should be shared_ptr or cow_ptr. Mingxin Wang -- 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. To view this discussion on the web visit https://groups.google.com/a/isocpp.org/d/msgid/std-proposals/664105b3-ea68-4565-8017-a4893f4b38bf%40isocpp.org. ------=_Part_18767_1033648290.1508203755574 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
On Tuesday, October 17, 2017 at 1:39:33 AM UTC+8, Aleksey = Loginov wrote:
In other words, by hand-made RTTI, and only for fixed allocation star= ategies (for example, data_ can not be a shared_ptr<T> or cow_ptr<= T>)

There is NO RTTI in the = implementation of "operator=3D". This operation is done via indir= ect function calls, and it is as efficient as most implementations of `std:= :any` from various vendors.

`data_` is actually im= plementation detail, I don't know about your motivation that it should = be shared_ptr<T> or cow_ptr<T>.

Mingxi= n Wang

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