text: /*=============================================================================
      Copyright (c) 2016 Kohei Takahashi
  
      Distributed under 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)
  ==============================================================================*/
  #include <boost/detail/lightweight_test.hpp>
  #include <boost/fusion/adapted/adt/adapt_adt.hpp>
  #include <boost/fusion/sequence/intrinsic/size.hpp>
  #include <boost/fusion/sequence/intrinsic/empty.hpp>
  #include <boost/fusion/sequence/intrinsic/begin.hpp>
  #include <boost/fusion/sequence/intrinsic/end.hpp>
  #include <boost/fusion/sequence/io/out.hpp>
  #include <boost/fusion/iterator/equal_to.hpp>
  #include <boost/fusion/container/vector/vector.hpp>
  #include <boost/fusion/container/list/list.hpp>
  #include <boost/fusion/container/generation/make_vector.hpp>
  #include <boost/fusion/sequence/comparison/equal_to.hpp>
  #include <boost/fusion/sequence/comparison/not_equal_to.hpp>
  #include <boost/fusion/sequence/comparison/less.hpp>
  #include <boost/fusion/sequence/comparison/less_equal.hpp>
  #include <boost/fusion/sequence/comparison/greater.hpp>
  #include <boost/fusion/sequence/comparison/greater_equal.hpp>
  #include <boost/fusion/mpl.hpp>
  #include <boost/fusion/support/is_view.hpp>
  #include <boost/mpl/is_sequence.hpp>
  #include <boost/mpl/assert.hpp>
  #include <iostream>
  
  template <typename T>
  class empty_adt{};
  BOOST_FUSION_ADAPT_TPL_ADT((T), (empty_adt)(T),)
  
  int
  main()
  {
      using namespace boost::fusion;
      using namespace boost;
  
      std::cout << tuple_open('[');
      std::cout << tuple_close(']');
      std::cout << tuple_delimiter(", ");
  
      {
          BOOST_MPL_ASSERT_NOT((traits::is_view<empty_adt<void> >));
          empty_adt<void> e;
  
          std::cout << e << std::endl;
          BOOST_TEST(e == make_vector());
  
          BOOST_STATIC_ASSERT(fusion::result_of::size<empty_adt<void> >::value == 0);
          BOOST_MPL_ASSERT((fusion::result_of::empty<empty_adt<void> >));
  
          BOOST_MPL_ASSERT((fusion::result_of::equal_to<
              fusion::result_of::begin<empty_adt<void> >::type,
              fusion::result_of::end<empty_adt<void> >::type>));
      }
  
      {
          fusion::vector<> v;
          empty_adt<void> e;
          BOOST_TEST(v == e);
          BOOST_TEST_NOT(v != e);
          BOOST_TEST_NOT(v < e);
          BOOST_TEST(v <= e);
          BOOST_TEST_NOT(e > v);
          BOOST_TEST(e >= v);
      }
  
      {
          empty_adt<void> e;
  
          // conversion from empty_adt to vector
          fusion::vector<> v(e);
          v = e;
  
          // FIXME
          // conversion from empty_adt to list
          //fusion::list<> l(e);
          //l = e;
      }
  
      BOOST_MPL_ASSERT((mpl::is_sequence<empty_adt<void> >));
  
      return boost::report_errors();
  }
  
  