boost/fusion/view/iterator_range/detail/segments_impl.hpp

   1 /*=============================================================================
   2     Copyright (c) 2011 Eric Niebler
   3
   4     Distributed under the Boost Software License, Version 1.0. (See accompanying
   5     file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
   6 ==============================================================================*/
   7 #if !defined(BOOST_FUSION_ITERATOR_RANGE_SEGMENTS_HPP_INCLUDED)
   8 #define BOOST_FUSION_ITERATOR_RANGE_SEGMENTS_HPP_INCLUDED
   9
  10 #include <boost/mpl/assert.hpp>
  11 #include <boost/fusion/sequence/intrinsic/segments.hpp>
  12 #include <boost/fusion/support/is_segmented.hpp>
  13 #include <boost/fusion/view/iterator_range/detail/segmented_iterator_range.hpp>
  14
  15 namespace boost { namespace fusion
  16 {
  17     struct iterator_range_tag;
  18
  19     namespace extension
  20     {
  21         template <typename Tag>
  22         struct segments_impl;
  23
  24         template <>
  25         struct segments_impl<iterator_range_tag>
  26         {
  27             template <typename Sequence>
  28             struct apply
  29             {
  30                 typedef
  31                     detail::make_segmented_range<
  32                         typename Sequence::begin_type
  33                       , typename Sequence::end_type
  34                     >
  35                 impl;
  36
  37                 BOOST_MPL_ASSERT((traits::is_segmented<typename impl::type>));
  38
  39                 typedef
  40                     typename result_of::segments<typename impl::type>::type
  41                 type;
  42
  43                 static type call(Sequence & seq)
  44                 {
  45                     return fusion::segments(impl::call(seq.first, seq.last));
  46                 }
  47             };
  48         };
  49     }
  50 }}
  51
  52 #endif