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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_MPL_ITERATOR_05052005_0731) | |
8 | #define FUSION_MPL_ITERATOR_05052005_0731 | |
9 | ||
10 | #include <boost/fusion/support/config.hpp> | |
11 | #include <boost/fusion/support/detail/mpl_iterator_category.hpp> | |
12 | #include <boost/fusion/iterator/iterator_facade.hpp> | |
13 | #include <boost/type_traits/remove_const.hpp> | |
14 | #include <boost/mpl/deref.hpp> | |
15 | #include <boost/mpl/next.hpp> | |
16 | #include <boost/mpl/prior.hpp> | |
17 | #include <boost/mpl/advance.hpp> | |
18 | #include <boost/mpl/distance.hpp> | |
19 | ||
20 | namespace boost { namespace fusion | |
21 | { | |
22 | template <typename Iterator_> | |
23 | struct mpl_iterator | |
24 | : iterator_facade< | |
25 | mpl_iterator<Iterator_> | |
26 | , typename detail::mpl_iterator_category<typename Iterator_::category>::type | |
27 | > | |
28 | { | |
29 | typedef typename remove_const<Iterator_>::type iterator_type; | |
30 | ||
31 | template <typename Iterator> | |
32 | struct value_of : mpl::deref<typename Iterator::iterator_type> {}; | |
33 | ||
34 | template <typename Iterator> | |
35 | struct deref | |
36 | { | |
37 | typedef typename mpl::deref< | |
38 | typename Iterator::iterator_type>::type | |
39 | type; | |
40 | ||
41 | BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED | |
42 | static type | |
43 | call(Iterator) | |
44 | { | |
45 | return type(); | |
46 | } | |
47 | }; | |
48 | ||
49 | template <typename Iterator> | |
50 | struct next | |
51 | { | |
52 | typedef mpl_iterator< | |
53 | typename mpl::next<typename Iterator::iterator_type>::type> | |
54 | type; | |
55 | ||
56 | BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED | |
57 | static type | |
58 | call(Iterator) | |
59 | { | |
60 | return type(); | |
61 | } | |
62 | }; | |
63 | ||
64 | template <typename Iterator> | |
65 | struct prior | |
66 | { | |
67 | typedef mpl_iterator< | |
68 | typename mpl::prior<typename Iterator::iterator_type>::type> | |
69 | type; | |
70 | ||
71 | BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED | |
72 | static type | |
73 | call(Iterator) | |
74 | { | |
75 | return type(); | |
76 | } | |
77 | }; | |
78 | ||
79 | template <typename Iterator, typename N> | |
80 | struct advance | |
81 | { | |
82 | typedef mpl_iterator< | |
83 | typename mpl::advance<typename Iterator::iterator_type, N>::type> | |
84 | type; | |
85 | ||
86 | BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED | |
87 | static type | |
88 | call(Iterator const& /*i*/) | |
89 | { | |
90 | return type(); | |
91 | } | |
92 | }; | |
93 | ||
94 | template <typename I1, typename I2> | |
95 | struct distance : | |
96 | mpl::distance< | |
97 | typename I1::iterator_type | |
98 | , typename I2::iterator_type> | |
99 | { | |
100 | typedef typename | |
101 | mpl::distance< | |
102 | typename I1::iterator_type | |
103 | , typename I2::iterator_type | |
104 | >::type | |
105 | type; | |
106 | ||
107 | BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED | |
108 | static type | |
109 | call(I1 const&, I2 const&) | |
110 | { | |
111 | return type(); | |
112 | } | |
113 | }; | |
114 | }; | |
115 | }} | |
116 | ||
117 | #ifdef BOOST_FUSION_WORKAROUND_FOR_LWG_2408 | |
118 | namespace std | |
119 | { | |
120 | template <typename Iterator> | |
121 | struct iterator_traits< ::boost::fusion::mpl_iterator<Iterator> > | |
122 | { }; | |
123 | } | |
124 | #endif | |
125 | ||
126 | #endif | |
127 | ||
128 |