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1 | /*============================================================================= |
2 | Copyright (c) 2001-2011 Joel de Guzman | |
3 | Copyright (c) 2006 Tobias Schwinger | |
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_PAIR_07222005_1203) | |
9 | #define FUSION_PAIR_07222005_1203 | |
10 | ||
11 | #include <boost/fusion/support/config.hpp> | |
12 | #include <iosfwd> | |
13 | ||
14 | #include <boost/fusion/support/detail/access.hpp> | |
15 | #include <boost/fusion/support/detail/as_fusion_element.hpp> | |
16 | #include <boost/config.hpp> | |
17 | #include <boost/utility/enable_if.hpp> | |
18 | #include <boost/type_traits/is_convertible.hpp> | |
19 | #include <boost/type_traits/is_lvalue_reference.hpp> | |
20 | ||
21 | #if defined (BOOST_MSVC) | |
22 | # pragma warning(push) | |
23 | # pragma warning (disable: 4512) // assignment operator could not be generated. | |
24 | #endif | |
25 | ||
26 | namespace boost { namespace fusion | |
27 | { | |
28 | // A half runtime pair where the first type does not have data | |
29 | template <typename First, typename Second> | |
30 | struct pair | |
31 | { | |
32 | BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED | |
33 | pair() | |
34 | : second() {} | |
35 | ||
36 | BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED | |
37 | pair(pair const& rhs) | |
38 | : second(rhs.second) {} | |
39 | ||
40 | #if !defined(BOOST_NO_CXX11_RVALUE_REFERENCES) | |
41 | BOOST_CXX14_CONSTEXPR BOOST_FUSION_GPU_ENABLED | |
42 | pair(pair&& rhs) | |
43 | : second(BOOST_FUSION_FWD_ELEM(Second, rhs.second)) {} | |
44 | #endif | |
45 | ||
46 | BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED | |
47 | pair(typename detail::call_param<Second>::type val) | |
48 | : second(val) {} | |
49 | ||
50 | #if !defined(BOOST_NO_CXX11_RVALUE_REFERENCES) | |
51 | template <typename Second2> | |
52 | BOOST_FUSION_GPU_ENABLED | |
53 | pair(Second2&& val | |
54 | , typename boost::disable_if<is_lvalue_reference<Second2> >::type* /* dummy */ = 0 | |
55 | , typename boost::enable_if<is_convertible<Second2, Second> >::type* /*dummy*/ = 0 | |
56 | ) : second(BOOST_FUSION_FWD_ELEM(Second, val)) {} | |
57 | #endif | |
58 | ||
59 | template <typename Second2> | |
60 | BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED | |
61 | pair(pair<First, Second2> const& rhs) | |
62 | : second(rhs.second) {} | |
63 | ||
64 | template <typename Second2> | |
65 | BOOST_CXX14_CONSTEXPR BOOST_FUSION_GPU_ENABLED | |
66 | pair& operator=(pair<First, Second2> const& rhs) | |
67 | { | |
68 | second = rhs.second; | |
69 | return *this; | |
70 | } | |
71 | ||
72 | BOOST_CXX14_CONSTEXPR BOOST_FUSION_GPU_ENABLED | |
73 | pair& operator=(pair const& rhs) | |
74 | { | |
75 | second = rhs.second; | |
76 | return *this; | |
77 | } | |
78 | ||
79 | #if !defined(BOOST_NO_CXX11_RVALUE_REFERENCES) | |
80 | BOOST_CXX14_CONSTEXPR BOOST_FUSION_GPU_ENABLED | |
81 | pair& operator=(pair&& rhs) | |
82 | { | |
83 | second = BOOST_FUSION_FWD_ELEM(Second, rhs.second); | |
84 | return *this; | |
85 | } | |
86 | #endif | |
87 | ||
88 | typedef First first_type; | |
89 | typedef Second second_type; | |
90 | Second second; | |
91 | }; | |
92 | ||
93 | namespace result_of | |
94 | { | |
95 | template<typename First, typename Second> | |
96 | struct make_pair | |
97 | { | |
98 | typedef fusion::pair<First, | |
99 | typename detail::as_fusion_element<Second>::type> type; | |
100 | }; | |
101 | ||
102 | template<class Pair> | |
103 | struct first | |
104 | { | |
105 | typedef typename Pair::first_type type; | |
106 | }; | |
107 | ||
108 | template<class Pair> | |
109 | struct second | |
110 | { | |
111 | typedef typename Pair::second_type type; | |
112 | }; | |
113 | } | |
114 | ||
115 | template <typename First, typename Second> | |
116 | BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED | |
117 | inline typename result_of::make_pair<First,Second>::type | |
118 | make_pair(Second const& val) | |
119 | { | |
120 | return pair<First, typename detail::as_fusion_element<Second>::type>(val); | |
121 | } | |
122 | ||
123 | template <typename First, typename Second> | |
124 | inline std::ostream& | |
125 | operator<<(std::ostream& os, pair<First, Second> const& p) | |
126 | { | |
127 | os << p.second; | |
128 | return os; | |
129 | } | |
130 | ||
131 | template <typename First, typename Second> | |
132 | inline std::istream& | |
133 | operator>>(std::istream& is, pair<First, Second>& p) | |
134 | { | |
135 | is >> p.second; | |
136 | return is; | |
137 | } | |
138 | ||
139 | template <typename First, typename SecondL, typename SecondR> | |
140 | BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED | |
141 | inline bool | |
142 | operator==(pair<First, SecondL> const& l, pair<First, SecondR> const& r) | |
143 | { | |
144 | return l.second == r.second; | |
145 | } | |
146 | ||
147 | template <typename First, typename SecondL, typename SecondR> | |
148 | BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED | |
149 | inline bool | |
150 | operator!=(pair<First, SecondL> const& l, pair<First, SecondR> const& r) | |
151 | { | |
152 | return l.second != r.second; | |
153 | } | |
154 | ||
155 | template <typename First, typename SecondL, typename SecondR> | |
156 | BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED | |
157 | inline bool | |
158 | operator<(pair<First, SecondL> const& l, pair<First, SecondR> const& r) | |
159 | { | |
160 | return l.second < r.second; | |
161 | } | |
162 | }} | |
163 | ||
164 | #if defined (BOOST_MSVC) | |
165 | # pragma warning(pop) | |
166 | #endif | |
167 | ||
168 | #endif |