[Boost-bugs] [Boost C++ Libraries] #9984: range iterator failing to model forward_iterator

Subject: [Boost-bugs] [Boost C++ Libraries] #9984: range iterator failing to model forward_iterator
From: Boost C++ Libraries (noreply_at_[hidden])
Date: 2014-05-01 12:06:31

#9984: range iterator failing to model forward_iterator
---------------------------------------------+-----------------------------
 Reporter:  Akim Demaille <akim.demaille@…>  |      Owner:
     Type:  Bugs                             |  jeffrey.hellrung
Milestone:  To Be Determined                 |     Status:  new
  Version:  Boost 1.55.0                     |  Component:  iterator
 Keywords:  clang                            |   Severity:  Problem
---------------------------------------------+-----------------------------
 The following code snippet passes successfully with GCC 4.9, but Clang 3.5
 (installed from MacPorts) fails to accept std::next.

 The symptoms are somewhat alike #9431, but I have no idea if it's the same
 issue.  According to the code of irange, I guess the problem is rather
 with Boost.Iterator.

 {{{
 $ cat bar.cc
 #include <boost/range/irange.hpp>

 int main()
 {
   auto range = boost::irange<int>(0, 10);
   auto i = std::begin(range);
   auto j = std::next(i);
   std::cerr << *j << std::endl;
 }
 $ clang++-mp-3.5 -std=c++11 -I /opt/local/include bar.cc
 bar.cc:7:12: error: no matching function for call to 'next'
   auto j = std::next(i);
            ^~~~~~~~~
 /opt/local/libexec/llvm-3.5/bin/../include/c++/v1/iterator:514:25: note:
 candidate template
       ignored: disabled by 'enable_if' [with _ForwardIter =
       boost::range_detail::integer_iterator<int>]
      typename enable_if<__is_forward_iterator<_ForwardIter>::value>::type*
 = 0)
                         ^
 1 error generated.
 $ g++-mp-4.9 -std=c++11 -I /opt/local/include bar.cc
 }}}

-- 
Ticket URL: <https://svn.boost.org/trac/boost/ticket/9984>
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