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1 | // |
2 | // detail/is_executor.hpp | |
3 | // ~~~~~~~~~~~~~~~~~~~~~~ | |
4 | // | |
5 | // Copyright (c) 2003-2017 Christopher M. Kohlhoff (chris at kohlhoff dot com) | |
6 | // | |
7 | // Distributed under the Boost Software License, Version 1.0. (See accompanying | |
8 | // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) | |
9 | // | |
10 | ||
11 | #ifndef BOOST_ASIO_DETAIL_IS_EXECUTOR_HPP | |
12 | #define BOOST_ASIO_DETAIL_IS_EXECUTOR_HPP | |
13 | ||
14 | #if defined(_MSC_VER) && (_MSC_VER >= 1200) | |
15 | # pragma once | |
16 | #endif // defined(_MSC_VER) && (_MSC_VER >= 1200) | |
17 | ||
18 | #include <boost/asio/detail/config.hpp> | |
19 | #include <boost/asio/detail/type_traits.hpp> | |
20 | ||
21 | #include <boost/asio/detail/push_options.hpp> | |
22 | ||
23 | namespace boost { | |
24 | namespace asio { | |
25 | namespace detail { | |
26 | ||
27 | struct executor_memfns_base | |
28 | { | |
29 | void context(); | |
30 | void on_work_started(); | |
31 | void on_work_finished(); | |
32 | void dispatch(); | |
33 | void post(); | |
34 | void defer(); | |
35 | }; | |
36 | ||
37 | template <typename T> | |
38 | struct executor_memfns_derived | |
39 | : T, executor_memfns_base | |
40 | { | |
41 | }; | |
42 | ||
43 | template <typename T, T> | |
44 | struct executor_memfns_check | |
45 | { | |
46 | }; | |
47 | ||
48 | template <typename> | |
49 | char (&context_memfn_helper(...))[2]; | |
50 | ||
51 | template <typename T> | |
52 | char context_memfn_helper( | |
53 | executor_memfns_check< | |
54 | void (executor_memfns_base::*)(), | |
55 | &executor_memfns_derived<T>::context>*); | |
56 | ||
57 | template <typename> | |
58 | char (&on_work_started_memfn_helper(...))[2]; | |
59 | ||
60 | template <typename T> | |
61 | char on_work_started_memfn_helper( | |
62 | executor_memfns_check< | |
63 | void (executor_memfns_base::*)(), | |
64 | &executor_memfns_derived<T>::on_work_started>*); | |
65 | ||
66 | template <typename> | |
67 | char (&on_work_finished_memfn_helper(...))[2]; | |
68 | ||
69 | template <typename T> | |
70 | char on_work_finished_memfn_helper( | |
71 | executor_memfns_check< | |
72 | void (executor_memfns_base::*)(), | |
73 | &executor_memfns_derived<T>::on_work_finished>*); | |
74 | ||
75 | template <typename> | |
76 | char (&dispatch_memfn_helper(...))[2]; | |
77 | ||
78 | template <typename T> | |
79 | char dispatch_memfn_helper( | |
80 | executor_memfns_check< | |
81 | void (executor_memfns_base::*)(), | |
82 | &executor_memfns_derived<T>::dispatch>*); | |
83 | ||
84 | template <typename> | |
85 | char (&post_memfn_helper(...))[2]; | |
86 | ||
87 | template <typename T> | |
88 | char post_memfn_helper( | |
89 | executor_memfns_check< | |
90 | void (executor_memfns_base::*)(), | |
91 | &executor_memfns_derived<T>::post>*); | |
92 | ||
93 | template <typename> | |
94 | char (&defer_memfn_helper(...))[2]; | |
95 | ||
96 | template <typename T> | |
97 | char defer_memfn_helper( | |
98 | executor_memfns_check< | |
99 | void (executor_memfns_base::*)(), | |
100 | &executor_memfns_derived<T>::defer>*); | |
101 | ||
102 | template <typename T> | |
103 | struct is_executor_class | |
104 | : integral_constant<bool, | |
105 | sizeof(context_memfn_helper<T>(0)) != 1 && | |
106 | sizeof(on_work_started_memfn_helper<T>(0)) != 1 && | |
107 | sizeof(on_work_finished_memfn_helper<T>(0)) != 1 && | |
108 | sizeof(dispatch_memfn_helper<T>(0)) != 1 && | |
109 | sizeof(post_memfn_helper<T>(0)) != 1 && | |
110 | sizeof(defer_memfn_helper<T>(0)) != 1> | |
111 | { | |
112 | }; | |
113 | ||
114 | template <typename T> | |
115 | struct is_executor | |
116 | : conditional<is_class<T>::value, | |
117 | is_executor_class<T>, | |
118 | false_type>::type | |
119 | { | |
120 | }; | |
121 | ||
122 | } // namespace detail | |
123 | } // namespace asio | |
124 | } // namespace boost | |
125 | ||
126 | #include <boost/asio/detail/pop_options.hpp> | |
127 | ||
128 | #endif // BOOST_ASIO_DETAIL_IS_EXECUTOR_HPP |