220 17367 article Path: news.gmane.org!not-for-mail From: "dgutson ." Newsgroups: gmane.comp.lang.c++.isocpp.proposals Subject: Nondeduced concepts reloaded Date: Thu, 16 Apr 2015 14:34:31 -0300 Lines: 74 Approved: news@gmane.org Message-ID: Reply-To: std-proposals@isocpp.org NNTP-Posting-Host: plane.gmane.org Mime-Version: 1.0 Content-Type: multipart/alternative; boundary=001a11334f146999610513dae00f X-Trace: ger.gmane.org 1429205675 18503 80.91.229.3 (16 Apr 2015 17:34:35 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Thu, 16 Apr 2015 17:34:35 +0000 (UTC) To: std-proposals Original-X-From: std-proposals+bncBDE3NBMV6UFBBKHFX6UQKGQEB4W7O7Q@isocpp.org Thu Apr 16 19:34:35 2015 Return-path: Envelope-to: gclcip-std-proposals@m.gmane.org Original-Received: from mail-ig0-f198.google.com ([209.85.213.198]) by plane.gmane.org with esmtp (Exim 4.69) (envelope-from ) id 1YingQ-0004hj-N1 for gclcip-std-proposals@m.gmane.org; Thu, 16 Apr 2015 19:34:34 +0200 Original-Received: by igbri1 with SMTP id ri1sf84673417igb.2 for ; Thu, 16 Apr 2015 10:34:33 -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:date:message-id:subject:from:to :content-type:x-original-sender:x-original-authentication-results :reply-to:precedence:mailing-list:list-id:list-post:list-help :list-archive:list-subscribe:list-unsubscribe; bh=JglplxP+irOp7/JwzQCaMh19iWX2L1C19OEXmKBp+GE=; b=JPIny0pYPV3tB3rFtqJ769SB2IQA7jHvG9t4v7n+w9IyV0P8jW6xLSvA16T+pGCOK9 Sq4Oq0v/LQF5q1ZdoD1qlFryznzSXYfRmBKPaZHK7n42XyS37onmu5Np+o1DyXuTOkUa F4zvVKI9pHW0nmHPG8Kjcui2kaC9gOj2tVcVf+dLCRmeYx2WV+8y4lahRdhLa8p1L36g yxN5ql5TzDcP9b0cYLjtY8Yb4V0FXTzAdwCtlY2WDQ6vRkZUYJU1GKRuoIEPjwVrMqqb 5k5IKPhZbIJs4w10m+2KB94ApMq1K6u4k0LKQ3GdW3gJPDyPhYPTYlREUgawYa4SNz84 sdhA== X-Gm-Message-State: ALoCoQkckk3RqNvEbrjDzzdbmgcaXsh01+TX3Nllhn6R9EM8lgpISmd0AuHvllDLU5K0GKhK43kv X-Received: by 10.42.206.144 with SMTP id fu16mr40601971icb.2.1429205673631; Thu, 16 Apr 2015 10:34:33 -0700 (PDT) X-BeenThere: std-proposals@isocpp.org Original-Received: by 10.107.28.21 with SMTP id c21ls998697ioc.37.gmail; Thu, 16 Apr 2015 10:34:32 -0700 (PDT) X-Received: by 10.43.72.138 with SMTP id yo10mr39232703icb.69.1429205672732; Thu, 16 Apr 2015 10:34:32 -0700 (PDT) Original-Received: from mail-ie0-x235.google.com (mail-ie0-x235.google.com. [2607:f8b0:4001:c03::235]) by mx.google.com with ESMTPS id i4si8148199igi.26.2015.04.16.10.34.32 for (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Thu, 16 Apr 2015 10:34:32 -0700 (PDT) Received-SPF: pass (google.com: domain of danielgutson@gmail.com designates 2607:f8b0:4001:c03::235 as permitted sender) client-ip=2607:f8b0:4001:c03::235; Original-Received: by iebrs15 with SMTP id rs15so57071949ieb.3 for ; Thu, 16 Apr 2015 10:34:32 -0700 (PDT) X-Received: by 10.43.129.130 with SMTP id hi2mr5017703icc.18.1429205672355; Thu, 16 Apr 2015 10:34:32 -0700 (PDT) Original-Received: by 10.36.55.5 with HTTP; Thu, 16 Apr 2015 10:34:31 -0700 (PDT) Original-Received: by 10.36.55.5 with HTTP; Thu, 16 Apr 2015 10:34:31 -0700 (PDT) X-Original-Sender: danielgutson@gmail.com X-Original-Authentication-Results: mx.google.com; spf=pass (google.com: domain of danielgutson@gmail.com designates 2607:f8b0:4001:c03::235 as permitted sender) smtp.mail=danielgutson@gmail.com; dkim=pass header.i=@gmail.com; dmarc=pass (p=NONE dis=NONE) header.from=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:17367 Archived-At: --001a11334f146999610513dae00f Content-Type: text/plain; charset=UTF-8 I guess this has been brought over and over but let me bring this once again. Are the nondeduced context restrictions still unsolvable nowadays? For example : template struct S { struct Inner {} ; }; template struct Template {}; template struct Template < typename S :: Inner> { int i;}; Template < S :: Inner> t; So according to the rules,X cannot be deduced when passing Inner. I'm neither looking for a workaround nor an explanation, I just want to confirm that there is no need to revise these rules at the light of the latest standard. Would concepts help here? Thanks! Daniel. -- --- 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/. --001a11334f146999610513dae00f Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: quoted-printable

I guess this has been brought over and over but let me bring= this once again.
Are the nondeduced context restrictions still unsolvable nowadays?
For example :

template <class X >
struct S { struct Inner {} ; };

template <class T> struct Template {};
template <class X> struct Template < typename S<x> :: Inner&= gt; { int i;};

Template < S<int> :: Inner> t;

So according to the rules,X cannot be deduced when passing I= nner.
I'm neither looking for a workaround nor an=C2=A0 explanation, I just w= ant to confirm that there is no need to revise these rules at the light of = the latest standard.
Would concepts help here?
Thanks!

=C2=A0 Daniel.

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