220 21218 article Path: news.gmane.org!not-for-mail From: David Stone Newsgroups: gmane.comp.lang.c++.isocpp.proposals Subject: Re: About p0015r0: A specialization-friendly std::common_type Date: Fri, 2 Oct 2015 17:30:28 -0600 Lines: 54 Approved: news@gmane.org Message-ID: References: Reply-To: std-proposals@isocpp.org NNTP-Posting-Host: plane.gmane.org Mime-Version: 1.0 Content-Type: multipart/alternative; boundary=001a113d22028bb8720521278c8e X-Trace: ger.gmane.org 1443828638 5188 80.91.229.3 (2 Oct 2015 23:30:38 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Fri, 2 Oct 2015 23:30:38 +0000 (UTC) Cc: "ISO C++ Standard - Future Proposals" To: Marc Original-X-From: std-proposals+bncBCB5ZIET2UNRBFNHXSYAKGQE4HFFZPI@isocpp.org Sat Oct 03 01:30:35 2015 Return-path: Envelope-to: gclcip-std-proposals@m.gmane.org Original-Received: from mail-ob0-f198.google.com ([209.85.214.198]) by plane.gmane.org with esmtp (Exim 4.69) (envelope-from ) id 1Zi9mZ-00085F-DZ for gclcip-std-proposals@m.gmane.org; Sat, 03 Oct 2015 01:30:31 +0200 Original-Received: by obri8 with SMTP id i8sf16694506obr.1 for ; Fri, 02 Oct 2015 16:30:30 -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:date :message-id:subject:from:to:cc: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=s6dTDyVWHmxP41lucfRWPaW38PPvDJ2IUsa6BTUoC3U=; b=T3htP6xFq/yjs1QQOn5MjbRzHQFx0vakGKwzgPSAJwG0nw/zzonuVnyuCDgKA9cXVj oCu6Ct/T2IIyI1UxRvq4LnRHgDRIvpD4/aPE9HpzUJsEqf6NLqiBYAu/vx/9/3iUsWbQ 6KV7EZ4W+3qJdGmmfYVR4BBwDPruREUlOmHo4rNgDAf0QAqlx0z3EFZ/7/mdwFoaPqzn +MNg1kA2qlF0xMJ4+hWnyzSML8ytLxuSk+Om7cpiLrB2oYh1GkLUZR5QBnyzBxPF20g3 btW5em4bj1DQoA7kTQy7xWofSqR/tkMmvT5X6XuCCDxeMD/OVbmi7KbsK/WdJTuKbaYC uAYw== X-Gm-Message-State: ALoCoQldPF3mL7YQzo/VQF8nVb/KW8O0TbVpW/AzHGeBkQHxPfr05LKMibK4qU7MoSOgugYbtTCw X-Received: by 10.50.62.148 with SMTP id y20mr131022igr.0.1443828630421; Fri, 02 Oct 2015 16:30:30 -0700 (PDT) X-BeenThere: std-proposals@isocpp.org Original-Received: by 10.182.29.41 with SMTP id g9ls924929obh.89.gmail; Fri, 02 Oct 2015 16:30:29 -0700 (PDT) X-Received: by 10.202.183.3 with SMTP id h3mr9309283oif.58.1443828629308; Fri, 02 Oct 2015 16:30:29 -0700 (PDT) Original-Received: from mail-oi0-x22c.google.com (mail-oi0-x22c.google.com. [2607:f8b0:4003:c06::22c]) by mx.google.com with ESMTPS id g7si7092733obh.48.2015.10.02.16.30.29 for (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Fri, 02 Oct 2015 16:30:29 -0700 (PDT) Received-SPF: pass (google.com: domain of deusexsophismata@gmail.com designates 2607:f8b0:4003:c06::22c as permitted sender) client-ip=2607:f8b0:4003:c06::22c; Original-Received: by oixx17 with SMTP id x17so65930089oix.0 for ; Fri, 02 Oct 2015 16:30:29 -0700 (PDT) X-Received: by 10.202.212.73 with SMTP id l70mr10330876oig.54.1443828628959; Fri, 02 Oct 2015 16:30:28 -0700 (PDT) Original-Sender: deusexsophismata@gmail.com Original-Received: by 10.60.5.228 with HTTP; Fri, 2 Oct 2015 16:30:28 -0700 (PDT) In-Reply-To: X-Original-Sender: DeusExSophismata@gmail.com X-Original-Authentication-Results: mx.google.com; spf=pass (google.com: domain of deusexsophismata@gmail.com designates 2607:f8b0:4003:c06::22c as permitted sender) smtp.mailfrom=deusexsophismata@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-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:21218 Archived-At: --001a113d22028bb8720521278c8e Content-Type: text/plain; charset=UTF-8 Thanks for the defect reference. This proposal should resolve that defect. As far as delegating to single-argument common_type, that to me feels like working around a problem rather than addressing it. I agree that we need something to fix the expression template + auto problem, but I do not think that common_type is that place, as it is a much larger problem than this. I believe that using auto was my favorite solution to that problem, so perhaps I should dig up the discussion on the ISOCPP proposals forum and write up a paper for it. -- --- 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/. --001a113d22028bb8720521278c8e Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: quoted-printable
Thanks for the defect reference. This proposal s= hould resolve that defect.

As far as delegating to single-argu= ment common_type, that to me feels like working around a problem rather tha= n addressing it. I agree that we need something to fix the expression templ= ate + auto problem, but I do not think that common_type is that place, as i= t is a much larger problem than this.

I believe that using auto was = my favorite solution to that problem, so perhaps I should dig up the discus= sion on the ISOCPP proposals forum and write up a paper for it.

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