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1 | /*============================================================================= | |
2 | Copyright (c) 2007 Tobias Schwinger | |
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_ITERATOR_RANGE_AT_IMPL_HPP_INCLUDED) | |
9 | #define BOOST_FUSION_ITERATOR_RANGE_AT_IMPL_HPP_INCLUDED | |
10 | ||
11 | #include <boost/fusion/support/config.hpp> | |
12 | #include <boost/fusion/iterator/advance.hpp> | |
13 | #include <boost/fusion/iterator/deref.hpp> | |
14 | ||
15 | namespace boost { namespace fusion | |
16 | { | |
17 | struct iterator_range_tag; | |
18 | ||
19 | namespace extension | |
20 | { | |
21 | template <typename Tag> | |
22 | struct at_impl; | |
23 | ||
24 | template <> | |
25 | struct at_impl<iterator_range_tag> | |
26 | { | |
27 | template <typename Seq, typename N> | |
28 | struct apply | |
29 | { | |
30 | typedef typename Seq::begin_type begin_type; | |
31 | typedef typename result_of::advance<begin_type,N>::type pos; | |
32 | typedef typename result_of::deref<pos>::type type; | |
33 | ||
34 | BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED | |
35 | static type | |
36 | call(Seq& s) | |
37 | { | |
38 | return * fusion::advance<N>(s.first); | |
39 | } | |
40 | }; | |
41 | }; | |
42 | } | |
43 | }} | |
44 | ||
45 | #endif | |
46 |