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1 | /*============================================================================= |
2 | Copyright (c) 2005-2013 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(BOOST_FUSION_MAP_ITERATOR_02042013_0835) | |
9 | #define BOOST_FUSION_MAP_ITERATOR_02042013_0835 | |
10 | ||
11 | #include <boost/fusion/support/config.hpp> | |
12 | #include <boost/fusion/iterator/iterator_facade.hpp> | |
13 | #include <boost/mpl/minus.hpp> | |
14 | #include <boost/mpl/equal_to.hpp> | |
15 | #include <boost/mpl/if.hpp> | |
16 | #include <boost/utility/declval.hpp> | |
17 | #include <boost/type_traits/is_const.hpp> | |
18 | #include <boost/type_traits/add_const.hpp> | |
19 | ||
20 | namespace boost { namespace fusion | |
21 | { | |
22 | struct random_access_traversal_tag; | |
23 | ||
24 | template <typename Seq, int Pos> | |
25 | struct map_iterator | |
26 | : iterator_facade< | |
27 | map_iterator<Seq, Pos> | |
28 | , typename Seq::category> | |
29 | { | |
30 | typedef Seq sequence; | |
31 | typedef mpl::int_<Pos> index; | |
32 | ||
33 | BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED | |
34 | map_iterator(Seq& seq) | |
35 | : seq_(seq) | |
36 | {} | |
37 | ||
38 | template<typename Iterator> | |
39 | struct value_of | |
40 | { | |
41 | typedef typename Iterator::sequence sequence; | |
42 | typedef typename Iterator::index index; | |
43 | typedef | |
44 | decltype(boost::declval<sequence>().get_val(index())) | |
45 | type; | |
46 | }; | |
47 | ||
48 | template<typename Iterator> | |
49 | struct value_of_data | |
50 | { | |
51 | typedef typename Iterator::sequence sequence; | |
52 | typedef typename Iterator::index index; | |
53 | typedef | |
54 | decltype(boost::declval<sequence>().get_val(index()).second) | |
55 | type; | |
56 | }; | |
57 | ||
58 | template<typename Iterator> | |
59 | struct key_of | |
60 | { | |
61 | typedef typename Iterator::sequence sequence; | |
62 | typedef typename Iterator::index index; | |
63 | typedef decltype(boost::declval<sequence>().get_key(index())) key_identity_type; | |
64 | typedef typename key_identity_type::type type; | |
65 | }; | |
66 | ||
67 | template<typename Iterator> | |
68 | struct deref | |
69 | { | |
70 | typedef typename Iterator::sequence sequence; | |
71 | typedef typename Iterator::index index; | |
72 | typedef | |
73 | decltype(boost::declval<sequence>().get(index())) | |
74 | type; | |
75 | ||
76 | BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED | |
77 | static type | |
78 | call(Iterator const& it) | |
79 | { | |
80 | return it.seq_.get(typename Iterator::index()); | |
81 | } | |
82 | }; | |
83 | ||
84 | template<typename Iterator> | |
85 | struct deref_data | |
86 | { | |
87 | typedef typename Iterator::sequence sequence; | |
88 | typedef typename Iterator::index index; | |
89 | ||
90 | typedef decltype(boost::declval<sequence>().get(index()).second) second_type_; | |
91 | ||
92 | typedef typename | |
93 | mpl::if_< | |
94 | is_const<sequence> | |
95 | , typename add_const<second_type_>::type | |
96 | , second_type_ | |
97 | >::type | |
98 | second_type; | |
99 | ||
100 | typedef typename add_reference<second_type>::type type; | |
101 | ||
102 | BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED | |
103 | static type | |
104 | call(Iterator const& it) | |
105 | { | |
106 | return it.seq_.get(typename Iterator::index()).second; | |
107 | } | |
108 | }; | |
109 | ||
110 | template <typename Iterator, typename N> | |
111 | struct advance | |
112 | { | |
113 | typedef typename Iterator::index index; | |
114 | typedef typename Iterator::sequence sequence; | |
115 | typedef map_iterator<sequence, index::value + N::value> type; | |
116 | ||
117 | BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED | |
118 | static type | |
119 | call(Iterator const& i) | |
120 | { | |
121 | return type(i.seq_); | |
122 | } | |
123 | }; | |
124 | ||
125 | template<typename Iterator> | |
126 | struct next | |
127 | : advance<Iterator, mpl::int_<1> > | |
128 | {}; | |
129 | ||
130 | template<typename Iterator> | |
131 | struct prior | |
132 | : advance<Iterator, mpl::int_<-1> > | |
133 | {}; | |
134 | ||
135 | template <typename I1, typename I2> | |
136 | struct distance | |
137 | { | |
138 | typedef typename | |
139 | mpl::minus< | |
140 | typename I2::index, typename I1::index | |
141 | >::type | |
142 | type; | |
143 | ||
144 | BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED | |
145 | static type | |
146 | call(I1 const&, I2 const&) | |
147 | { | |
148 | return type(); | |
149 | } | |
150 | }; | |
151 | ||
152 | template<typename I1, typename I2> | |
153 | struct equal_to | |
154 | : mpl::equal_to<typename I1::index, typename I2::index> | |
155 | {}; | |
156 | ||
157 | Seq& seq_; | |
158 | ||
159 | private: | |
160 | // silence MSVC warning C4512: assignment operator could not be generated | |
161 | map_iterator& operator= (map_iterator const&); | |
162 | }; | |
163 | ||
164 | }} | |
165 | ||
166 | #ifdef BOOST_FUSION_WORKAROUND_FOR_LWG_2408 | |
167 | namespace std | |
168 | { | |
169 | template <typename Seq, int Pos> | |
170 | struct iterator_traits< ::boost::fusion::map_iterator<Seq, Pos> > | |
171 | { }; | |
172 | } | |
173 | #endif | |
174 | ||
175 | #endif |