3rdparty/boost/boost/fusion/view/iterator_range/detail/is_segmented_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_IS_SEGMENTED_HPP_INCLUDED)
   8 #define BOOST_FUSION_ITERATOR_RANGE_IS_SEGMENTED_HPP_INCLUDED
   9
  10 #include <boost/fusion/support/config.hpp>
  11 #include <boost/mpl/assert.hpp>
  12 #include <boost/mpl/bool.hpp>
  13
  14 namespace boost { namespace fusion
  15 {
  16     struct iterator_range_tag;
  17
  18     template <typename Context>
  19     struct segmented_iterator;
  20
  21     namespace extension
  22     {
  23         template <typename Tag>
  24         struct is_segmented_impl;
  25
  26         // An iterator_range of segmented_iterators is segmented
  27         template <>
  28         struct is_segmented_impl<iterator_range_tag>
  29         {
  30         private:
  31             template <typename Iterator>
  32             struct is_segmented_iterator
  33               : mpl::false_
  34             {};
  35
  36             template <typename Iterator>
  37             struct is_segmented_iterator<Iterator &>
  38               : is_segmented_iterator<Iterator>
  39             {};
  40
  41             template <typename Iterator>
  42             struct is_segmented_iterator<Iterator const>
  43               : is_segmented_iterator<Iterator>
  44             {};
  45
  46             template <typename Context>
  47             struct is_segmented_iterator<segmented_iterator<Context> >
  48               : mpl::true_
  49             {};
  50
  51         public:
  52             template <typename Sequence>
  53             struct apply
  54               : is_segmented_iterator<typename Sequence::begin_type>
  55             {
  56                 BOOST_MPL_ASSERT_RELATION(
  57                     is_segmented_iterator<typename Sequence::begin_type>::value
  58                   , ==
  59                   , is_segmented_iterator<typename Sequence::end_type>::value);
  60             };
  61         };
  62     }
  63 }}
  64
  65 #endif
  66
  67