220 21336 <2258653.TrFlJqTDWj@tjmaciei-mobl4> article Path: news.gmane.org!not-for-mail From: Thiago Macieira Newsgroups: gmane.comp.lang.c++.isocpp.proposals Subject: Re: Re: missing hash_code result in P0029 Date: Tue, 06 Oct 2015 08:06:54 +0100 Lines: 30 Approved: news@gmane.org Message-ID: <2258653.TrFlJqTDWj@tjmaciei-mobl4> References: <1894409.GHBCqMxsGN@tjmaciei-mobl4> 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 1444115244 21355 80.91.229.3 (6 Oct 2015 07:07:24 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Tue, 6 Oct 2015 07:07:24 +0000 (UTC) To: std-proposals@isocpp.org Original-X-From: std-proposals+bncBCB4TK757YBRBHHGZWYAKGQEBDILBSI@isocpp.org Tue Oct 06 09:07:14 2015 Return-path: Envelope-to: gclcip-std-proposals@m.gmane.org Original-Received: from mail-lb0-f199.google.com ([209.85.217.199]) by plane.gmane.org with esmtp (Exim 4.69) (envelope-from ) id 1ZjMLA-00051W-8J for gclcip-std-proposals@m.gmane.org; Tue, 06 Oct 2015 09:07:12 +0200 Original-Received: by lbwr8 with SMTP id r8sf44480049lbw.0 for ; Tue, 06 Oct 2015 00:07:11 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:from:to:subject:date:message-id:user-agent :in-reply-to:references:mime-version: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=eOGfAG3qOAow+TdIWxxPvPZjMLrTpMMX/fiSR8fRKfY=; b=j6wqUIRK1gyiHf7igvdjAbalQjnHnIoV6Q1hIJ1/0DotF8F80vn+OlD9PDMKtY/JBE E/vayYBFioNjYMWW9eAdGLW0Af8j76qTaAZZBGxLq/kVqIdYMu+afJoTRjkPITFBfvq2 ngij7qweqSIy3yhfrohZUuQ8gkL84hyPAy0ec0XOvJuTZ7WcM1x7Y1NlqBJ3VNUcEbL8 eq0Lpl/Bd0klDGQoAUxK1HngAdkbvLmszbye0jzmRYH2/p6lr5cdm/RyYAMO/1IKKYy+ 3MfImOVgj6GgLritUJh012g0M/lGYvc+Tzz7c0b22NlrnGIxnnouFVRWc+5YygYsszwU cePA= X-Gm-Message-State: ALoCoQnpET8nXT5jfyoI3ZacWxevPgz61HMk0YPtcSF9/EINahNxXBlYrp3mJQ6IBKtKVb6xACip X-Received: by 10.180.35.132 with SMTP id h4mr3219851wij.5.1444115231838; Tue, 06 Oct 2015 00:07:11 -0700 (PDT) X-BeenThere: std-proposals@isocpp.org Original-Received: by 10.180.107.169 with SMTP id hd9ls1014885wib.31.gmail; Tue, 06 Oct 2015 00:07:08 -0700 (PDT) X-Received: by 10.180.86.165 with SMTP id q5mr16156638wiz.27.1444115228016; Tue, 06 Oct 2015 00:07:08 -0700 (PDT) Original-Received: from gondolin.macieira.info (gondolin.macieira.info. [78.47.120.188]) by mx.google.com with ESMTP id hq5si36197737wjb.134.2015.10.06.00.07.07 for ; Tue, 06 Oct 2015 00:07:07 -0700 (PDT) Received-SPF: pass (google.com: domain of thiago@macieira.org designates 78.47.120.188 as permitted sender) client-ip=78.47.120.188; Original-Received: from tjmaciei-mobl4.localnet (jfdmzpr02-ext.jf.intel.com [134.134.137.71]) by gondolin.macieira.info (Postfix) with ESMTPSA id A079611B634 for ; Tue, 6 Oct 2015 00:07:06 -0700 (PDT) User-Agent: KMail/4.14.9 (Linux/4.1.6-1-desktop; KDE/4.14.9; x86_64; ; ) In-Reply-To: X-Original-Sender: thiago@macieira.org X-Original-Authentication-Results: mx.google.com; spf=pass (google.com: domain of thiago@macieira.org designates 78.47.120.188 as permitted sender) smtp.mailfrom=thiago@macieira.org 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:21336 Archived-At: On Monday 05 October 2015 22:33:50 Shahms King wrote: > As far as I understand it, you don't. std::hash_code is the internal state > of whatever hash algorithm is being used by std::hash. Either you're using > std::hash, in which case it initializes the std::hash_code through > mechanisms unknown and similarly extracts the value or you're using a > different algorithm which uses a different type to represent its internal > state which conforms to the HashCode concept and you don't traffic in > std::hash_code at all. At least, that's my reading of the proposal. > > Either your hash_value() function accepts std::hash_code and only works > with std::hash, or it's a template and supports any conforming hashing > algorithm. Ok, so the class is not useful or interesting at all for me. I will pay it no further attention. -- Thiago Macieira - thiago (AT) macieira.info - thiago (AT) kde.org Software Architect - Intel Open Source Technology Center PGP/GPG: 0x6EF45358; fingerprint: E067 918B B660 DBD1 105C 966C 33F5 F005 6EF4 5358 -- --- You received this message because you are subscribed to the Google Groups "ISO C++ Standard - Future Proposals" group. 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