boost/fusion/container/vector/detail/value_at_impl.hpp

   1 /*=============================================================================
   2     Copyright (c) 2001-2006 Joel de Guzman
   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(FUSION_VALUE_AT_IMPL_05052005_0232)
   8 #define FUSION_VALUE_AT_IMPL_05052005_0232
   9
  10 #include <boost/mpl/at.hpp>
  11
  12 namespace boost { namespace fusion
  13 {
  14     struct vector_tag;
  15
  16     namespace extension
  17     {
  18         template <typename Tag>
  19         struct value_at_impl;
  20
  21         template <>
  22         struct value_at_impl<vector_tag>
  23         {
  24             template <typename Sequence, typename N>
  25             struct apply
  26             {
  27                 typedef typename mpl::at<typename Sequence::types, N>::type type;
  28             };
  29         };
  30     }
  31 }}
  32
  33 #endif