From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <gcc-bugs-return-344126-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org>
Received: (qmail 8689 invoked by alias); 20 Jan 2011 15:49:14 -0000
Received: (qmail 8677 invoked by uid 22791); 20 Jan 2011 15:49:13 -0000
X-SWARE-Spam-Status: No, hits=-2.9 required=5.0	tests=ALL_TRUSTED,AWL,BAYES_00
X-Spam-Check-By: sourceware.org
Received: from localhost (HELO gcc.gnu.org) (127.0.0.1)    by sourceware.org (qpsmtpd/0.43rc1) with ESMTP; Thu, 20 Jan 2011 15:49:09 +0000
From: "marc.glisse at normalesup dot org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug libstdc++/47380] New: concept checking and incomplete types
X-Bugzilla-Reason: CC
X-Bugzilla-Type: new
X-Bugzilla-Watch-Reason: None
X-Bugzilla-Product: gcc
X-Bugzilla-Component: libstdc++
X-Bugzilla-Keywords:
X-Bugzilla-Severity: normal
X-Bugzilla-Who: marc.glisse at normalesup dot org
X-Bugzilla-Status: UNCONFIRMED
X-Bugzilla-Priority: P3
X-Bugzilla-Assigned-To: unassigned at gcc dot gnu.org
X-Bugzilla-Target-Milestone: ---
X-Bugzilla-Changed-Fields:
Message-ID: <bug-47380-4@http.gcc.gnu.org/bugzilla/>
X-Bugzilla-URL: http://gcc.gnu.org/bugzilla/
Auto-Submitted: auto-generated
Content-Type: text/plain; charset="UTF-8"
MIME-Version: 1.0
Date: Thu, 20 Jan 2011 16:37:00 -0000
Mailing-List: contact gcc-bugs-help@gcc.gnu.org; run by ezmlm
Precedence: bulk
List-Id: <gcc-bugs.gcc.gnu.org>
List-Archive: <http://gcc.gnu.org/ml/gcc-bugs/>
List-Post: <mailto:gcc-bugs@gcc.gnu.org>
List-Help: <mailto:gcc-bugs-help@gcc.gnu.org>
Sender: gcc-bugs-owner@gcc.gnu.org
X-SW-Source: 2011-01/txt/msg02065.txt.bz2

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47380

           Summary: concept checking and incomplete types
           Product: gcc
           Version: 4.6.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: libstdc++
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: marc.glisse@normalesup.org


The following code compiles fine in normal mode, but not with
-D_GLIBCXX_CONCEPT_CHECKS, which basically thinks the types are incomplete. Is
this a known limitation?
(by the way, the relevant doc still says C++0x will have concepts)

#include <map>

template<typename T, typename U> struct A;

template< typename T> struct B {
        typedef A<T,B> Handle;
        std::map<int,Handle> y;
};

template<typename T, typename U = B< T> >
struct A : U { };

int main(){
        A<int> x;
}