ceph/src/boost/libs/fusion/example/extension/detail/value_at_key_impl.hpp

   1 /*=============================================================================
   2     Copyright (c) 2001-2011 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_VALUE_AT_KEY_IMPL_20060223_2025)
   9 #define BOOST_FUSION_VALUE_AT_KEY_IMPL_20060223_2025
  10
  11 namespace fields
  12 {
  13     struct name;
  14     struct age;
  15 }
  16
  17 namespace example
  18 {
  19     struct example_sequence_tag;
  20 }
  21
  22 namespace boost { namespace fusion {
  23
  24     namespace extension
  25     {
  26         template<typename Tag>
  27         struct value_at_key_impl;
  28
  29         template<>
  30         struct value_at_key_impl<example::example_sequence_tag>
  31         {
  32             template<typename Sequence, typename N>
  33             struct apply;
  34
  35             template<typename Sequence>
  36             struct apply<Sequence, fields::name>
  37             {
  38                 typedef std::string type;
  39             };
  40
  41             template<typename Sequence>
  42             struct apply<Sequence, fields::age>
  43             {
  44                 typedef int type;
  45             };
  46         };
  47     }
  48 }}
  49
  50 #endif