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1 | // |
2 | // Copyright (c) 2013-2017 Vinnie Falco (vinnie dot falco at gmail dot com) | |
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 | ||
8 | #ifndef BEAST_DETAIL_STREAM_CONCEPTS_HPP | |
9 | #define BEAST_DETAIL_STREAM_CONCEPTS_HPP | |
10 | ||
11 | #include <beast/core/buffer_concepts.hpp> | |
12 | #include <beast/core/error.hpp> | |
13 | #include <boost/asio/io_service.hpp> | |
14 | #include <type_traits> | |
15 | #include <utility> | |
16 | ||
17 | namespace beast { | |
18 | namespace detail { | |
19 | ||
20 | // Types that meet the requirements, | |
21 | // for use with std::declval only. | |
22 | struct StreamHandler | |
23 | { | |
24 | StreamHandler(StreamHandler const&) = default; | |
25 | void operator()(error_code ec, std::size_t); | |
26 | }; | |
27 | using ReadHandler = StreamHandler; | |
28 | using WriteHandler = StreamHandler; | |
29 | ||
30 | template<class T> | |
31 | class has_get_io_service | |
32 | { | |
33 | template<class U, class R = typename std::is_same< | |
34 | decltype(std::declval<U>().get_io_service()), | |
35 | boost::asio::io_service&>> | |
36 | static R check(int); | |
37 | template<class> | |
38 | static std::false_type check(...); | |
39 | public: | |
40 | using type = decltype(check<T>(0)); | |
41 | }; | |
42 | ||
43 | template<class T> | |
44 | class is_AsyncReadStream | |
45 | { | |
46 | template<class U, class R = decltype( | |
47 | std::declval<U>().async_read_some( | |
48 | std::declval<MutableBufferSequence>(), | |
49 | std::declval<ReadHandler>()), | |
50 | std::true_type{})> | |
51 | static R check(int); | |
52 | template<class> | |
53 | static std::false_type check(...); | |
54 | using type1 = decltype(check<T>(0)); | |
55 | public: | |
56 | using type = std::integral_constant<bool, | |
57 | type1::value && | |
58 | has_get_io_service<T>::type::value>; | |
59 | }; | |
60 | ||
61 | template<class T> | |
62 | class is_AsyncWriteStream | |
63 | { | |
64 | template<class U, class R = decltype( | |
65 | std::declval<U>().async_write_some( | |
66 | std::declval<ConstBufferSequence>(), | |
67 | std::declval<WriteHandler>()), | |
68 | std::true_type{})> | |
69 | static R check(int); | |
70 | template<class> | |
71 | static std::false_type check(...); | |
72 | using type1 = decltype(check<T>(0)); | |
73 | public: | |
74 | using type = std::integral_constant<bool, | |
75 | type1::value && | |
76 | has_get_io_service<T>::type::value>; | |
77 | }; | |
78 | ||
79 | template<class T> | |
80 | class is_SyncReadStream | |
81 | { | |
82 | template<class U, class R = std::is_same<decltype( | |
83 | std::declval<U>().read_some( | |
84 | std::declval<MutableBufferSequence>())), | |
85 | std::size_t>> | |
86 | static R check1(int); | |
87 | template<class> | |
88 | static std::false_type check1(...); | |
89 | using type1 = decltype(check1<T>(0)); | |
90 | ||
91 | template<class U, class R = std::is_same<decltype( | |
92 | std::declval<U>().read_some( | |
93 | std::declval<MutableBufferSequence>(), | |
94 | std::declval<error_code&>())), std::size_t>> | |
95 | static R check2(int); | |
96 | template<class> | |
97 | static std::false_type check2(...); | |
98 | using type2 = decltype(check2<T>(0)); | |
99 | ||
100 | public: | |
101 | using type = std::integral_constant<bool, | |
102 | type1::value && type2::value>; | |
103 | }; | |
104 | ||
105 | template<class T> | |
106 | class is_SyncWriteStream | |
107 | { | |
108 | template<class U, class R = std::is_same<decltype( | |
109 | std::declval<U>().write_some( | |
110 | std::declval<ConstBufferSequence>())), | |
111 | std::size_t>> | |
112 | static R check1(int); | |
113 | template<class> | |
114 | static std::false_type check1(...); | |
115 | using type1 = decltype(check1<T>(0)); | |
116 | ||
117 | template<class U, class R = std::is_same<decltype( | |
118 | std::declval<U>().write_some( | |
119 | std::declval<ConstBufferSequence>(), | |
120 | std::declval<error_code&>())), std::size_t>> | |
121 | static R check2(int); | |
122 | template<class> | |
123 | static std::false_type check2(...); | |
124 | using type2 = decltype(check2<T>(0)); | |
125 | ||
126 | public: | |
127 | using type = std::integral_constant<bool, | |
128 | type1::value && type2::value>; | |
129 | }; | |
130 | ||
131 | } // detail | |
132 | } // beast | |
133 | ||
134 | #endif |