boost/fusion/container/deque/detail/end_impl.hpp

   1 /*=============================================================================
   2     Copyright (c) 2001-2006 Joel de Guzman
   3     Copyright (c) 2005-2006 Dan Marsden
   4
   5     Distributed under the Boost Software License, Version 1.0. (See accompanying
   6     file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
   7 ==============================================================================*/
   8 #if !defined(BOOST_FUSION_DEQUE_END_IMPL_09122006_2034)
   9 #define BOOST_FUSION_DEQUE_END_IMPL_09122006_2034
  10
  11 #include <boost/fusion/container/deque/deque_iterator.hpp>
  12
  13 #include <boost/mpl/equal_to.hpp>
  14 #include <boost/mpl/if.hpp>
  15
  16 namespace boost { namespace fusion {
  17
  18     struct deque_tag;
  19
  20     namespace extension
  21     {
  22         template<typename T>
  23         struct end_impl;
  24
  25         template<>
  26         struct end_impl<deque_tag>
  27         {
  28             template<typename Sequence>
  29             struct apply
  30             {
  31                 typedef typename mpl::if_<
  32                     mpl::equal_to<typename Sequence::next_down, typename Sequence::next_up>,
  33                     deque_iterator<Sequence, 0>,
  34                     deque_iterator<
  35                     Sequence, Sequence::next_up::value> >::type type;
  36
  37                 static type call(Sequence& seq)
  38                 {
  39                     return type(seq);
  40                 }
  41             };
  42         };
  43     }
  44 }}
  45
  46 #endif