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1 | /*============================================================================= |
2 | Copyright (c) 2001-2011 Joel de Guzman | |
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 | #if !defined(FUSION_VALUE_AT_IMPL_05052005_0232) | |
8 | #define FUSION_VALUE_AT_IMPL_05052005_0232 | |
9 | ||
10 | #include <boost/fusion/support/config.hpp> | |
11 | #include <boost/mpl/at.hpp> | |
12 | ||
13 | namespace boost { namespace fusion | |
14 | { | |
15 | struct vector_tag; | |
16 | ||
17 | namespace extension | |
18 | { | |
19 | template <typename Tag> | |
20 | struct value_at_impl; | |
21 | ||
22 | template <> | |
23 | struct value_at_impl<vector_tag> | |
24 | { | |
25 | template <typename Sequence, typename N> | |
26 | struct apply | |
27 | { | |
28 | typedef typename mpl::at<typename Sequence::types, N>::type type; | |
29 | }; | |
30 | }; | |
31 | } | |
32 | }} | |
33 | ||
34 | #endif |