ceph/src/boost/boost/fusion/view/nview/detail/value_at_impl.hpp

   1 /*=============================================================================
   2     Copyright (c) 2009 Hartmut Kaiser
   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
   8 #if !defined(BOOST_FUSION_NVIEW_VALUE_AT_IMPL_SEP_24_2009_0234PM)
   9 #define BOOST_FUSION_NVIEW_VALUE_AT_IMPL_SEP_24_2009_0234PM
  10
  11 #include <boost/fusion/support/config.hpp>
  12 #include <boost/fusion/sequence/intrinsic/value_at.hpp>
  13
  14 namespace boost { namespace fusion
  15 {
  16     struct nview_tag;
  17
  18     namespace extension
  19     {
  20         template<typename Tag>
  21         struct value_at_impl;
  22
  23         template<>
  24         struct value_at_impl<nview_tag>
  25         {
  26             template<typename Sequence, typename N>
  27             struct apply
  28             {
  29                 typedef typename Sequence::sequence_type sequence_type;
  30                 typedef typename Sequence::index_type index_type;
  31
  32                 typedef typename result_of::at<index_type, N>::type index;
  33                 typedef typename result_of::at<sequence_type, index>::type type;
  34             };
  35         };
  36     }
  37
  38 }}
  39
  40 #endif