From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <gcc-bugs-return-473677-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org>
Received: (qmail 11332 invoked by alias); 17 Jan 2015 21:11:21 -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
Received: (qmail 11292 invoked by uid 48); 17 Jan 2015 21:11:16 -0000
From: "redi at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug libstdc++/64649] New: regex_traits::lookup_classname() only works with random access iterators
Date: Sat, 17 Jan 2015 21:11:00 -0000
X-Bugzilla-Reason: CC
X-Bugzilla-Type: new
X-Bugzilla-Watch-Reason: None
X-Bugzilla-Product: gcc
X-Bugzilla-Component: libstdc++
X-Bugzilla-Version: 4.9.3
X-Bugzilla-Keywords: rejects-valid
X-Bugzilla-Severity: normal
X-Bugzilla-Who: redi at gcc dot gnu.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-Flags:
X-Bugzilla-Changed-Fields: bug_id short_desc product version bug_status keywords bug_severity priority component assigned_to reporter
Message-ID: <bug-64649-4@http.gcc.gnu.org/bugzilla/>
Content-Type: text/plain; charset="UTF-8"
Content-Transfer-Encoding: 7bit
X-Bugzilla-URL: http://gcc.gnu.org/bugzilla/
Auto-Submitted: auto-generated
MIME-Version: 1.0
X-SW-Source: 2015-01/txt/msg01671.txt.bz2

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64649

            Bug ID: 64649
           Summary: regex_traits::lookup_classname() only works with
                    random access iterators
           Product: gcc
           Version: 4.9.3
            Status: UNCONFIRMED
          Keywords: rejects-valid
          Severity: normal
          Priority: P3
         Component: libstdc++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: redi at gcc dot gnu.org

#include <regex>
#include <forward_list>

int main()
{
  std::forward_list<char> f{ 'A' };
  std::regex_traits<char>{}.lookup_collatename(f.begin(), f.end());
}

This function should work with ForwardIterators, but it fails because of line
300 in bits/regex.tcc

      std::string __s(__last - __first, '?');