Re: [Boost-bugs] [Boost C++ Libraries] #8483: Fix for reference type deduction in join_iterator.hpp

Subject: Re: [Boost-bugs] [Boost C++ Libraries] #8483: Fix for reference type deduction in join_iterator.hpp
From: Boost C++ Libraries (noreply_at_[hidden])
Date: 2013-08-19 15:07:24

#8483: Fix for reference type deduction in join_iterator.hpp
-------------------------------+---------------------------
  Reporter:  stheophil@…       |      Owner:  neilgroves
      Type:  Bugs              |     Status:  new
 Milestone:  To Be Determined  |  Component:  range
   Version:  Boost 1.55.0      |   Severity:  Problem
Resolution:                    |   Keywords:  join_iterator
-------------------------------+---------------------------

Comment (by stheophil@…):

 I'm sorry it took so long for me to respond. The problem is easy to
 replicate:

 {{{
 typedef boost::join_iterator<
    std::vector<int>::const_iterator,
    std::vector<int>::iterator
 > JoinIterator;

 static_assert( std::is_same<
    typename JoinIterator::reference,
    int const&
 >::value, "" );
 }}}

 The static_assert should not trigger but it does with the old
 implementation of join_iterator (using Visual Studio 2012). add_const<
 int& >::type is still int&. We need to remove the reference first, then
 add const then re-add the reference. (Or find an altogether better
 solution :-)

-- 
Ticket URL: <https://svn.boost.org/trac/boost/ticket/8483#comment:2>
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