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1 | /*============================================================================= |
2 | Copyright (c) 2009 Hartmut Kaiser | |
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 | #if !defined(BOOST_FUSION_VALUE_OF_PRIOR_IMPL_SEP_24_2009_0158PM) | |
9 | #define BOOST_FUSION_VALUE_OF_PRIOR_IMPL_SEP_24_2009_0158PM | |
10 | ||
11 | #include <boost/fusion/support/config.hpp> | |
12 | #include <boost/fusion/iterator/deref.hpp> | |
13 | #include <boost/fusion/container/vector.hpp> | |
14 | ||
15 | namespace boost { namespace fusion | |
16 | { | |
17 | struct nview_iterator_tag; | |
18 | ||
19 | template <typename Sequence, typename Pos> | |
20 | struct nview_iterator; | |
21 | ||
22 | namespace extension | |
23 | { | |
24 | template <typename Tag> | |
25 | struct value_of_impl; | |
26 | ||
27 | template <> | |
28 | struct value_of_impl<nview_iterator_tag> | |
29 | { | |
30 | template <typename Iterator> | |
31 | struct apply | |
32 | { | |
33 | typedef typename Iterator::first_type first_type; | |
34 | typedef typename Iterator::sequence_type sequence_type; | |
35 | ||
36 | typedef typename result_of::deref<first_type>::type index; | |
37 | typedef typename result_of::at< | |
38 | typename sequence_type::sequence_type, index>::type type; | |
39 | }; | |
40 | }; | |
41 | } | |
42 | ||
43 | }} | |
44 | ||
45 | #endif |