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1 | /*============================================================================= |
2 | Copyright (c) 2001-2011 Joel de Guzman | |
3 | Copyright (c) 2005-2006 Dan Marsden | |
4 | ||
5 | Distributed under the Boost Software License, Version 1.0. (See accompanying | |
6 | file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) | |
7 | ==============================================================================*/ | |
8 | #if !defined(FUSION_DISTANCE_IMPL_14122005_2104) | |
9 | #define FUSION_DISTANCE_IMPL_14122005_2104 | |
10 | ||
11 | #include <boost/fusion/support/config.hpp> | |
12 | #include <boost/fusion/iterator/distance.hpp> | |
13 | ||
14 | namespace boost { namespace fusion { | |
15 | ||
16 | struct reverse_view_iterator_tag; | |
17 | ||
18 | template <typename Iterator> | |
19 | struct reverse_view_iterator; | |
20 | ||
21 | namespace extension | |
22 | { | |
23 | template<typename Tag> | |
24 | struct distance_impl; | |
25 | ||
26 | template<> | |
27 | struct distance_impl<reverse_view_iterator_tag> | |
28 | { | |
29 | template<typename First, typename Last> | |
30 | struct apply | |
31 | { | |
32 | typedef typename First::first_type first_type; | |
33 | typedef typename Last::first_type last_type; | |
34 | typedef typename result_of::distance<last_type, first_type>::type type; | |
35 | ||
36 | BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED | |
37 | static type | |
38 | call(First const& first, Last const& last) | |
39 | { | |
40 | return boost::fusion::distance(last.first, first.first); | |
41 | } | |
42 | }; | |
43 | }; | |
44 | } | |
45 | }} | |
46 | ||
47 | #endif |