text: /*=============================================================================
      Copyright (c) 2001-2011 Joel de Guzman
      Copyright (c) 2005-2006 Dan Marsden
      Copyright (c) 2018 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)
  ==============================================================================*/
  #if !defined(BOOST_FUSION_VALUE_AT_IMPL_20061101_0745)
  #define BOOST_FUSION_VALUE_AT_IMPL_20061101_0745
  
  #include <boost/fusion/support/config.hpp>
  #include <boost/fusion/sequence/intrinsic/value_at.hpp>
  #include <boost/utility/result_of.hpp>
  
  namespace boost { namespace fusion {
      struct transform_view_tag;
      struct transform_view2_tag;
  
      namespace extension
      {
          template<typename Tag>
          struct value_at_impl;
  
          template<>
          struct value_at_impl<transform_view_tag>
          {
              template<typename Seq, typename N>
              struct apply
              {
                  typedef typename Seq::transform_type F;
                  typedef typename result_of::value_at<typename Seq::sequence_type, N>::type value_type;
                  typedef typename boost::result_of<F(value_type)>::type type;
              };
          };
  
          template<>
          struct value_at_impl<transform_view2_tag>
          {
              template<typename Seq, typename N>
              struct apply
              {
                  typedef typename Seq::transform_type F;
                  typedef typename result_of::value_at<typename Seq::sequence1_type, N>::type value1_type;
                  typedef typename result_of::value_at<typename Seq::sequence2_type, N>::type value2_type;
                  typedef typename boost::result_of<F(value1_type, value2_type)>::type type;
              };
          };
      }
  }}
  
  #endif
  