text: /*=============================================================================
      Copyright (c) 2001-2011 Joel de Guzman
      Copyright (c) 2005-2006 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)
  ==============================================================================*/
  #if !defined(BOOST_FUSION_AT_IMPL_20061029_1946)
  #define BOOST_FUSION_AT_IMPL_20061029_1946
  
  #include <boost/fusion/support/config.hpp>
  #include <boost/mpl/apply.hpp>
  #include <boost/fusion/view/transform_view/detail/apply_transform_result.hpp>
  #include <boost/fusion/sequence/intrinsic/at.hpp>
  
  namespace boost { namespace fusion {
      struct transform_view_tag;
      struct transform_view2_tag;
  
      namespace extension
      {
          template<typename Tag>
          struct at_impl;
  
          template<>
          struct at_impl<transform_view_tag>
          {
              template<typename Seq, typename N>
              struct apply
              {
                  typedef typename Seq::transform_type F;
                  typedef detail::apply_transform_result<F> transform_type;
                  typedef typename boost::fusion::result_of::at<typename Seq::sequence_type, N>::type value_type;
                  typedef typename mpl::apply<transform_type, value_type>::type type;
  
                  BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
                  static type call(Seq& seq)
                  {
                      return seq.f(boost::fusion::at<N>(seq.seq));
                  }
              };
          };
  
          template<>
          struct at_impl<transform_view2_tag>
          {
              template<typename Seq, typename N>
              struct apply
              {
                  typedef typename Seq::transform_type F;
                  typedef detail::apply_transform_result<F> transform_type;
                  typedef typename boost::fusion::result_of::at<typename Seq::sequence1_type, N>::type value1_type;
                  typedef typename boost::fusion::result_of::at<typename Seq::sequence2_type, N>::type value2_type;
                  typedef typename mpl::apply<transform_type, value1_type, value2_type>::type type;
  
                  BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
                  static type call(Seq& seq)
                  {
                      return seq.f(boost::fusion::at<N>(seq.seq1), boost::fusion::at<N>(seq.seq2));
                  }
              };
          };
      }
  }}
  
  #endif
  