boost/fusion/container/map/detail/value_at_key_impl.hpp

   1 /*=============================================================================
   2     Copyright (c) 2001-2006 Joel de Guzman
   3     Copyright (c) 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(FUSION_VALUE_AT_KEY_IMPL_05222005_0325)
   9 #define FUSION_VALUE_AT_KEY_IMPL_05222005_0325
  10
  11 namespace boost { namespace fusion
  12 {
  13     struct map_tag;
  14
  15     namespace extension
  16     {
  17         template <typename Tag>
  18         struct value_at_key_impl;
  19
  20         template <>
  21         struct value_at_key_impl<map_tag>
  22         {
  23             template <typename Sequence, typename Key>
  24             struct apply
  25             {
  26                 typedef typename Sequence::
  27                     template meta_at_impl<Key>::type type;
  28             };
  29         };
  30     }
  31 }}
  32
  33 #endif