text: /*=============================================================================
      Copyright (c) 2007 Tobias Schwinger
  
      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_ITERATOR_RANGE_AT_IMPL_HPP_INCLUDED)
  #define BOOST_FUSION_ITERATOR_RANGE_AT_IMPL_HPP_INCLUDED
  
  #include <boost/fusion/support/config.hpp>
  #include <boost/fusion/iterator/advance.hpp>
  #include <boost/fusion/iterator/deref.hpp>
  
  namespace boost { namespace fusion
  {
      struct iterator_range_tag;
  
      namespace extension
      {
          template <typename Tag>
          struct at_impl;
  
          template <>
          struct at_impl<iterator_range_tag>
          {
              template <typename Seq, typename N>
              struct apply
              {
                  typedef typename Seq::begin_type begin_type;
                  typedef typename result_of::advance<begin_type,N>::type pos;
                  typedef typename result_of::deref<pos>::type type;
  
                  BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
                  static type
                  call(Seq& s)
                  {
                      return * fusion::advance<N>(s.first);
                  }
              };
          };
      }
  }}
  
  #endif
  
  