ceph/src/boost/libs/tr1/test/test_reference_wrapper.cpp

   1 //  (C) Copyright John Maddock 2005.
   2 //  Use, modification and distribution are subject to the
   3 //  Boost Software License, Version 1.0. (See accompanying file
   4 //  LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
   5
   6 #ifdef TEST_STD_HEADERS
   7 #include <functional>
   8 #else
   9 #include <boost/tr1/functional.hpp>
  10 #endif
  11
  12 #include <boost/static_assert.hpp>
  13 #include <boost/type_traits/is_convertible.hpp>
  14 #include <boost/type_traits/is_same.hpp>
  15
  16 int main()
  17 {
  18    typedef std::tr1::reference_wrapper<int> rr_type;
  19    typedef std::tr1::reference_wrapper<const int> crr_type;
  20
  21    int i, j;
  22    rr_type r1 = std::tr1::ref(i);
  23    crr_type r2 = std::tr1::cref(i);
  24    r1 = std::tr1::ref(j);
  25
  26    int& ref = r1.get();
  27
  28    BOOST_STATIC_ASSERT((::boost::is_convertible<rr_type, int&>::value));
  29    BOOST_STATIC_ASSERT((::boost::is_convertible<crr_type, const int&>::value));
  30    BOOST_STATIC_ASSERT((::boost::is_same<rr_type::type, int>::value));
  31    BOOST_STATIC_ASSERT((::boost::is_same<crr_type::type, const int>::value));
  32 }