text: //  (C) Copyright John Maddock 2005.
  //  Use, modification and distribution are subject to the
  //  Boost Software License, Version 1.0. (See accompanying file
  //  LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
  
  #ifdef TEST_STD_HEADERS
  #include <functional>
  #else
  #include <boost/tr1/functional.hpp>
  #endif
  
  #include <boost/static_assert.hpp>
  #include <boost/type_traits/is_convertible.hpp>
  #include <boost/type_traits/is_same.hpp>
  
  int main()
  {
     typedef std::tr1::reference_wrapper<int> rr_type;
     typedef std::tr1::reference_wrapper<const int> crr_type;
  
     int i, j;
     rr_type r1 = std::tr1::ref(i);
     crr_type r2 = std::tr1::cref(i);
     r1 = std::tr1::ref(j);
  
     int& ref = r1.get();
  
     BOOST_STATIC_ASSERT((::boost::is_convertible<rr_type, int&>::value));
     BOOST_STATIC_ASSERT((::boost::is_convertible<crr_type, const int&>::value));
     BOOST_STATIC_ASSERT((::boost::is_same<rr_type::type, int>::value));
     BOOST_STATIC_ASSERT((::boost::is_same<crr_type::type, const int>::value));
  }
  