ceph/src/boost/boost/fusion/view/single_view/detail/value_of_impl.hpp

   1 /*=============================================================================
   2     Copyright (c) 2001-2011 Joel de Guzman
   3     Copyright (c) 2011 Eric Niebler
   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_SINGLE_VIEW_VALUE_OF_IMPL_05052005_0324)
   9 #define BOOST_FUSION_SINGLE_VIEW_VALUE_OF_IMPL_05052005_0324
  10
  11 #include <boost/fusion/support/config.hpp>
  12 #include <boost/mpl/int.hpp>
  13 #include <boost/mpl/assert.hpp>
  14 #include <boost/mpl/equal_to.hpp>
  15
  16 namespace boost { namespace fusion
  17 {
  18     struct single_view_iterator_tag;
  19
  20     namespace extension
  21     {
  22         template <typename Tag>
  23         struct value_of_impl;
  24
  25         template <>
  26         struct value_of_impl<single_view_iterator_tag>
  27         {
  28             template <typename Iterator>
  29             struct apply
  30             {
  31                 BOOST_MPL_ASSERT((mpl::equal_to<typename Iterator::position, mpl::int_<0> >));
  32                 typedef typename Iterator::value_type type;
  33             };
  34         };
  35     }
  36 }}
  37
  38 #endif
  39
  40