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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_EQUAL_TO_05052005_1208) | |
8 | #define FUSION_EQUAL_TO_05052005_1208 | |
9 | ||
10 | #include <boost/fusion/support/config.hpp> | |
11 | #include <boost/type_traits/is_same.hpp> | |
12 | #include <boost/fusion/support/tag_of.hpp> | |
13 | #include <boost/type_traits/add_const.hpp> | |
14 | #include <boost/fusion/support/is_iterator.hpp> | |
15 | #include <boost/mpl/and.hpp> | |
16 | #include <boost/utility/enable_if.hpp> | |
17 | ||
18 | namespace boost { namespace fusion | |
19 | { | |
20 | // Special tags: | |
21 | struct iterator_facade_tag; // iterator facade tag | |
22 | struct boost_array_iterator_tag; // boost::array iterator tag | |
23 | struct mpl_iterator_tag; // mpl sequence iterator tag | |
24 | struct std_pair_iterator_tag; // std::pair iterator tag | |
25 | ||
26 | namespace extension | |
27 | { | |
28 | template <typename Tag> | |
29 | struct equal_to_impl | |
30 | { | |
31 | // default implementation | |
32 | template <typename I1, typename I2> | |
33 | struct apply | |
34 | : is_same<typename add_const<I1>::type, typename add_const<I2>::type> | |
35 | {}; | |
36 | }; | |
37 | ||
38 | template <> | |
39 | struct equal_to_impl<iterator_facade_tag> | |
40 | { | |
41 | template <typename It1, typename It2, typename Tag1, typename Tag2> | |
42 | struct dispatch : mpl::false_ {}; | |
43 | ||
44 | template <typename It1, typename It2, typename Tag> | |
45 | struct dispatch<It1, It2, Tag, Tag> // same tag | |
46 | : It1::template equal_to<It1, It2> | |
47 | {}; | |
48 | ||
49 | template<typename It1, typename It2> | |
50 | struct apply : dispatch<It1, It2, | |
51 | typename It1::fusion_tag, typename It2::fusion_tag> | |
52 | {}; | |
53 | }; | |
54 | ||
55 | template <> | |
56 | struct equal_to_impl<boost_array_iterator_tag>; | |
57 | ||
58 | template <> | |
59 | struct equal_to_impl<mpl_iterator_tag>; | |
60 | ||
61 | template <> | |
62 | struct equal_to_impl<std_pair_iterator_tag>; | |
63 | } | |
64 | ||
65 | namespace result_of | |
66 | { | |
67 | template <typename I1, typename I2> | |
68 | struct equal_to | |
69 | : extension::equal_to_impl<typename detail::tag_of<I1>::type>:: | |
70 | template apply<I1, I2> | |
71 | {}; | |
72 | } | |
73 | ||
74 | namespace iterator_operators | |
75 | { | |
76 | template <typename Iter1, typename Iter2> | |
77 | BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED | |
78 | inline typename | |
79 | boost::enable_if< | |
80 | mpl::and_<is_fusion_iterator<Iter1>, is_fusion_iterator<Iter2> > | |
81 | , bool | |
82 | >::type | |
83 | operator==(Iter1 const&, Iter2 const&) | |
84 | { | |
85 | return result_of::equal_to<Iter1, Iter2>::value; | |
86 | } | |
87 | ||
88 | template <typename Iter1, typename Iter2> | |
89 | BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED | |
90 | inline typename | |
91 | boost::enable_if< | |
92 | mpl::and_<is_fusion_iterator<Iter1>, is_fusion_iterator<Iter2> > | |
93 | , bool | |
94 | >::type | |
95 | operator!=(Iter1 const&, Iter2 const&) | |
96 | { | |
97 | return !result_of::equal_to<Iter1, Iter2>::value; | |
98 | } | |
99 | } | |
100 | ||
101 | using iterator_operators::operator==; | |
102 | using iterator_operators::operator!=; | |
103 | }} | |
104 | ||
105 | #endif | |
106 |