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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_NVIEW_DEREF_IMPL_SEP_24_2009_0818AM) | |
9 | #define BOOST_FUSION_NVIEW_DEREF_IMPL_SEP_24_2009_0818AM | |
10 | ||
11 | #include <boost/fusion/support/config.hpp> | |
12 | #include <boost/fusion/iterator/value_of.hpp> | |
13 | #include <boost/fusion/sequence/intrinsic/at.hpp> | |
14 | ||
15 | namespace boost { namespace fusion | |
16 | { | |
17 | struct nview_iterator_tag; | |
18 | ||
19 | namespace extension | |
20 | { | |
21 | template<typename Tag> | |
22 | struct deref_impl; | |
23 | ||
24 | template<> | |
25 | struct deref_impl<nview_iterator_tag> | |
26 | { | |
27 | template<typename Iterator> | |
28 | struct apply | |
29 | { | |
30 | typedef typename Iterator::first_type first_type; | |
31 | typedef typename Iterator::sequence_type sequence_type; | |
32 | ||
33 | typedef typename result_of::value_of<first_type>::type index; | |
34 | typedef typename result_of::at< | |
35 | typename sequence_type::sequence_type, index>::type type; | |
36 | ||
37 | BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED | |
38 | static type call(Iterator const& i) | |
39 | { | |
40 | return at<index>(i.seq.seq); | |
41 | } | |
42 | }; | |
43 | }; | |
44 | ||
45 | } | |
46 | ||
47 | }} | |
48 | ||
49 | #endif | |
50 |