text: /*=============================================================================
      Copyright (c) 2001-2007 Joel de Guzman
      Copyright (c) 2007 Dan Marsden
  
      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/container/vector.hpp>
  #include <boost/fusion/view/zip_view.hpp>
  #include <boost/fusion/support/unused.hpp>
  #include <boost/fusion/iterator.hpp>
  #include <boost/fusion/sequence/intrinsic.hpp>
  
  #include <boost/mpl/assert.hpp>
  #include <boost/type_traits/is_same.hpp>
  
  int main()
  {
      using namespace boost::fusion;
      {
          typedef vector2<int,int> int_vector;
          typedef vector2<char,char> char_vector;
          typedef vector<int_vector&, unused_type const&, char_vector&> seqs_type;
          typedef zip_view<seqs_type> view;
  
          int_vector iv(1,2);
          char_vector cv('a','b');
          seqs_type seq(iv, unused, cv);
          view v(seq);
  
          BOOST_TEST(at_c<0>(front(v)) == 1);
          BOOST_TEST(at_c<2>(front(v)) == 'a');
          BOOST_TEST(at_c<0>(back(v)) == 2);
          BOOST_TEST(at_c<2>(back(v)) == 'b');
  
          typedef boost::fusion::result_of::begin<view>::type first_iterator;
          typedef boost::fusion::result_of::value_of<first_iterator>::type first_element;
  
          typedef boost::fusion::result_of::at_c<first_element, 0>::type e0;
          typedef boost::fusion::result_of::at_c<first_element, 2>::type e2;
          BOOST_MPL_ASSERT((boost::is_same<e0, int&>));
          BOOST_MPL_ASSERT((boost::is_same<e2, char&>));
  
          BOOST_TEST(size(front(v)) == 3);
  
          typedef boost::fusion::result_of::value_at_c<view, 0>::type first_value_at;
          typedef boost::fusion::result_of::value_at_c<first_value_at, 0>::type v0;
          typedef boost::fusion::result_of::value_at_c<first_value_at, 2>::type v2;
  
          BOOST_MPL_ASSERT((boost::is_same<v0, int>));
          BOOST_MPL_ASSERT((boost::is_same<v2, char>));
  
          BOOST_TEST(at_c<0>(at_c<0>(v)) == 1);
          BOOST_TEST(at_c<2>(at_c<0>(v)) == 'a');
      }
      return boost::report_errors();
  }
  