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1 | // |
2 | // detail/is_buffer_sequence.hpp | |
3 | // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ | |
4 | // | |
11fdf7f2 | 5 | // Copyright (c) 2003-2018 Christopher M. Kohlhoff (chris at kohlhoff dot com) |
b32b8144 FG |
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_BUFFER_SEQUENCE_HPP | |
12 | #define BOOST_ASIO_DETAIL_IS_BUFFER_SEQUENCE_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 | ||
26 | class mutable_buffer; | |
27 | class const_buffer; | |
28 | ||
29 | namespace detail { | |
30 | ||
31 | struct buffer_sequence_memfns_base | |
32 | { | |
33 | void begin(); | |
34 | void end(); | |
35 | void size(); | |
36 | void max_size(); | |
37 | void capacity(); | |
38 | void data(); | |
39 | void prepare(); | |
40 | void commit(); | |
41 | void consume(); | |
42 | }; | |
43 | ||
44 | template <typename T> | |
45 | struct buffer_sequence_memfns_derived | |
46 | : T, buffer_sequence_memfns_base | |
47 | { | |
48 | }; | |
49 | ||
50 | template <typename T, T> | |
51 | struct buffer_sequence_memfns_check | |
52 | { | |
53 | }; | |
54 | ||
55 | template <typename> | |
56 | char (&begin_memfn_helper(...))[2]; | |
57 | ||
58 | template <typename T> | |
59 | char begin_memfn_helper( | |
60 | buffer_sequence_memfns_check< | |
61 | void (buffer_sequence_memfns_base::*)(), | |
62 | &buffer_sequence_memfns_derived<T>::begin>*); | |
63 | ||
64 | template <typename> | |
65 | char (&end_memfn_helper(...))[2]; | |
66 | ||
67 | template <typename T> | |
68 | char end_memfn_helper( | |
69 | buffer_sequence_memfns_check< | |
70 | void (buffer_sequence_memfns_base::*)(), | |
71 | &buffer_sequence_memfns_derived<T>::end>*); | |
72 | ||
73 | template <typename> | |
74 | char (&size_memfn_helper(...))[2]; | |
75 | ||
76 | template <typename T> | |
77 | char size_memfn_helper( | |
78 | buffer_sequence_memfns_check< | |
79 | void (buffer_sequence_memfns_base::*)(), | |
80 | &buffer_sequence_memfns_derived<T>::size>*); | |
81 | ||
82 | template <typename> | |
83 | char (&max_size_memfn_helper(...))[2]; | |
84 | ||
85 | template <typename T> | |
86 | char max_size_memfn_helper( | |
87 | buffer_sequence_memfns_check< | |
88 | void (buffer_sequence_memfns_base::*)(), | |
89 | &buffer_sequence_memfns_derived<T>::max_size>*); | |
90 | ||
91 | template <typename> | |
92 | char (&capacity_memfn_helper(...))[2]; | |
93 | ||
94 | template <typename T> | |
95 | char capacity_memfn_helper( | |
96 | buffer_sequence_memfns_check< | |
97 | void (buffer_sequence_memfns_base::*)(), | |
98 | &buffer_sequence_memfns_derived<T>::capacity>*); | |
99 | ||
100 | template <typename> | |
101 | char (&data_memfn_helper(...))[2]; | |
102 | ||
103 | template <typename T> | |
104 | char data_memfn_helper( | |
105 | buffer_sequence_memfns_check< | |
106 | void (buffer_sequence_memfns_base::*)(), | |
107 | &buffer_sequence_memfns_derived<T>::data>*); | |
108 | ||
109 | template <typename> | |
110 | char (&prepare_memfn_helper(...))[2]; | |
111 | ||
112 | template <typename T> | |
113 | char prepare_memfn_helper( | |
114 | buffer_sequence_memfns_check< | |
115 | void (buffer_sequence_memfns_base::*)(), | |
11fdf7f2 | 116 | &buffer_sequence_memfns_derived<T>::prepare>*); |
b32b8144 FG |
117 | |
118 | template <typename> | |
119 | char (&commit_memfn_helper(...))[2]; | |
120 | ||
121 | template <typename T> | |
122 | char commit_memfn_helper( | |
123 | buffer_sequence_memfns_check< | |
124 | void (buffer_sequence_memfns_base::*)(), | |
125 | &buffer_sequence_memfns_derived<T>::commit>*); | |
126 | ||
127 | template <typename> | |
128 | char (&consume_memfn_helper(...))[2]; | |
129 | ||
130 | template <typename T> | |
131 | char consume_memfn_helper( | |
132 | buffer_sequence_memfns_check< | |
133 | void (buffer_sequence_memfns_base::*)(), | |
134 | &buffer_sequence_memfns_derived<T>::consume>*); | |
135 | ||
136 | template <typename, typename> | |
137 | char (&buffer_element_type_helper(...))[2]; | |
138 | ||
139 | #if defined(BOOST_ASIO_HAS_DECL_TYPE) | |
140 | ||
141 | template <typename T, typename Buffer> | |
142 | char buffer_element_type_helper(T* t, | |
143 | typename enable_if<is_convertible< | |
144 | decltype(*buffer_sequence_begin(*t)), | |
145 | Buffer>::value>::type*); | |
146 | ||
147 | #else // defined(BOOST_ASIO_HAS_DECL_TYPE) | |
148 | ||
149 | template <typename T, typename Buffer> | |
150 | char buffer_element_type_helper( | |
151 | typename T::const_iterator*, | |
152 | typename enable_if<is_convertible< | |
153 | typename T::value_type, Buffer>::value>::type*); | |
154 | ||
155 | #endif // defined(BOOST_ASIO_HAS_DECL_TYPE) | |
156 | ||
157 | template <typename> | |
158 | char (&const_buffers_type_typedef_helper(...))[2]; | |
159 | ||
160 | template <typename T> | |
161 | char const_buffers_type_typedef_helper( | |
162 | typename T::const_buffers_type*); | |
163 | ||
164 | template <typename> | |
165 | char (&mutable_buffers_type_typedef_helper(...))[2]; | |
166 | ||
167 | template <typename T> | |
168 | char mutable_buffers_type_typedef_helper( | |
169 | typename T::mutable_buffers_type*); | |
170 | ||
171 | template <typename T, typename Buffer> | |
172 | struct is_buffer_sequence_class | |
173 | : integral_constant<bool, | |
174 | sizeof(begin_memfn_helper<T>(0)) != 1 && | |
175 | sizeof(end_memfn_helper<T>(0)) != 1 && | |
176 | sizeof(buffer_element_type_helper<T, Buffer>(0, 0)) == 1> | |
177 | { | |
178 | }; | |
179 | ||
180 | template <typename T, typename Buffer> | |
181 | struct is_buffer_sequence | |
182 | : conditional<is_class<T>::value, | |
183 | is_buffer_sequence_class<T, Buffer>, | |
184 | false_type>::type | |
185 | { | |
186 | }; | |
187 | ||
188 | template <> | |
189 | struct is_buffer_sequence<mutable_buffer, mutable_buffer> | |
190 | : true_type | |
191 | { | |
192 | }; | |
193 | ||
194 | template <> | |
195 | struct is_buffer_sequence<mutable_buffer, const_buffer> | |
196 | : true_type | |
197 | { | |
198 | }; | |
199 | ||
200 | template <> | |
201 | struct is_buffer_sequence<const_buffer, const_buffer> | |
202 | : true_type | |
203 | { | |
204 | }; | |
205 | ||
206 | template <> | |
207 | struct is_buffer_sequence<const_buffer, mutable_buffer> | |
208 | : false_type | |
209 | { | |
210 | }; | |
211 | ||
212 | template <typename T> | |
213 | struct is_dynamic_buffer_class | |
214 | : integral_constant<bool, | |
215 | sizeof(size_memfn_helper<T>(0)) != 1 && | |
216 | sizeof(max_size_memfn_helper<T>(0)) != 1 && | |
217 | sizeof(capacity_memfn_helper<T>(0)) != 1 && | |
218 | sizeof(data_memfn_helper<T>(0)) != 1 && | |
219 | sizeof(consume_memfn_helper<T>(0)) != 1 && | |
220 | sizeof(prepare_memfn_helper<T>(0)) != 1 && | |
221 | sizeof(commit_memfn_helper<T>(0)) != 1 && | |
222 | sizeof(const_buffers_type_typedef_helper<T>(0)) == 1 && | |
223 | sizeof(mutable_buffers_type_typedef_helper<T>(0)) == 1> | |
224 | { | |
225 | }; | |
226 | ||
227 | template <typename T> | |
228 | struct is_dynamic_buffer | |
229 | : conditional<is_class<T>::value, | |
230 | is_dynamic_buffer_class<T>, | |
231 | false_type>::type | |
232 | { | |
233 | }; | |
234 | ||
235 | } // namespace detail | |
236 | } // namespace asio | |
237 | } // namespace boost | |
238 | ||
239 | #include <boost/asio/detail/pop_options.hpp> | |
240 | ||
241 | #endif // BOOST_ASIO_DETAIL_IS_BUFFER_SEQUENCE_HPP |