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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_KEY_OF_HPP | |
9 | #define BOOST_FUSION_ITERATOR_KEY_OF_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 key_of_impl; | |
22 | ||
23 | template <> | |
24 | struct key_of_impl<iterator_facade_tag> | |
25 | { | |
26 | template <typename It> | |
27 | struct apply | |
28 | : It::template key_of<It> | |
29 | {}; | |
30 | }; | |
31 | } | |
32 | ||
33 | namespace result_of | |
34 | { | |
35 | template <typename It> | |
36 | struct key_of | |
37 | : extension::key_of_impl<typename traits::tag_of<It>::type>:: | |
38 | template apply<It> | |
39 | {}; | |
40 | } | |
41 | }} | |
42 | ||
43 | #endif |