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 |
169 | |