1 /*=============================================================================
2     Copyright (c) 2009 Christopher Schmidt
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 #ifndef BOOST_FUSION_ITERATOR_DEREF_DATA_HPP
9 #define BOOST_FUSION_ITERATOR_DEREF_DATA_HPP
10 
11 #include <boost/fusion/support/config.hpp>
12 #include <boost/fusion/support/tag_of.hpp>
13 
14 namespace boost { namespace fusion
15 {
16     struct iterator_facade_tag;
17 
18     namespace extension
19     {
20         template <typename>
21         struct deref_data_impl;
22 
23         template <>
24         struct deref_data_impl<iterator_facade_tag>
25         {
26             template <typename It>
27             struct apply
28               : It::template deref_data<It>
29             {};
30        };
31     }
32 
33     namespace result_of
34     {
35         template <typename It>
36         struct deref_data
37           : extension::deref_data_impl<typename traits::tag_of<It>::type>::
38                 template apply<It>
39         {};
40     }
41 
42     template <typename It>
43     BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
44     inline typename result_of::deref_data<It>::type
deref_data(It const & it)45     deref_data(It const& it)
46     {
47         return result_of::deref_data<It>::call(it);
48     }
49 }}
50 
51 #endif
52