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1 | // |
2 | // execution/blocking_adaptation.hpp | |
3 | // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ | |
4 | // | |
5 | // Copyright (c) 2003-2020 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_EXECUTION_BLOCKING_ADAPTATION_HPP | |
12 | #define BOOST_ASIO_EXECUTION_BLOCKING_ADAPTATION_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/event.hpp> | |
20 | #include <boost/asio/detail/mutex.hpp> | |
21 | #include <boost/asio/detail/type_traits.hpp> | |
22 | #include <boost/asio/execution/execute.hpp> | |
23 | #include <boost/asio/execution/executor.hpp> | |
24 | #include <boost/asio/execution/scheduler.hpp> | |
25 | #include <boost/asio/execution/sender.hpp> | |
26 | #include <boost/asio/is_applicable_property.hpp> | |
27 | #include <boost/asio/prefer.hpp> | |
28 | #include <boost/asio/query.hpp> | |
29 | #include <boost/asio/require.hpp> | |
30 | #include <boost/asio/traits/prefer_member.hpp> | |
31 | #include <boost/asio/traits/query_free.hpp> | |
32 | #include <boost/asio/traits/query_member.hpp> | |
33 | #include <boost/asio/traits/query_static_constexpr_member.hpp> | |
34 | #include <boost/asio/traits/require_member.hpp> | |
35 | #include <boost/asio/traits/static_query.hpp> | |
36 | #include <boost/asio/traits/static_require.hpp> | |
37 | ||
38 | #include <boost/asio/detail/push_options.hpp> | |
39 | ||
40 | namespace boost { | |
41 | namespace asio { | |
42 | ||
43 | #if defined(GENERATING_DOCUMENTATION) | |
44 | ||
45 | namespace execution { | |
46 | ||
47 | /// A property to describe whether automatic adaptation of an executor is | |
48 | /// allowed in order to apply the blocking_adaptation_t::allowed_t property. | |
49 | struct blocking_adaptation_t | |
50 | { | |
51 | /// The blocking_adaptation_t property applies to executors, senders, and | |
52 | /// schedulers. | |
53 | template <typename T> | |
54 | static constexpr bool is_applicable_property_v = | |
55 | is_executor_v<T> || is_sender_v<T> || is_scheduler_v<T>; | |
56 | ||
57 | /// The top-level blocking_adaptation_t property cannot be required. | |
58 | static constexpr bool is_requirable = false; | |
59 | ||
60 | /// The top-level blocking_adaptation_t property cannot be preferred. | |
61 | static constexpr bool is_preferable = false; | |
62 | ||
63 | /// The type returned by queries against an @c any_executor. | |
64 | typedef blocking_adaptation_t polymorphic_query_result_type; | |
65 | ||
66 | /// A sub-property that indicates that automatic adaptation is not allowed. | |
67 | struct disallowed_t | |
68 | { | |
69 | /// The blocking_adaptation_t::disallowed_t property applies to executors, | |
70 | /// senders, and schedulers. | |
71 | template <typename T> | |
72 | static constexpr bool is_applicable_property_v = | |
73 | is_executor_v<T> || is_sender_v<T> || is_scheduler_v<T>; | |
74 | ||
75 | /// The blocking_adaptation_t::disallowed_t property can be required. | |
76 | static constexpr bool is_requirable = true; | |
77 | ||
78 | /// The blocking_adaptation_t::disallowed_t property can be preferred. | |
79 | static constexpr bool is_preferable = true; | |
80 | ||
81 | /// The type returned by queries against an @c any_executor. | |
82 | typedef blocking_adaptation_t polymorphic_query_result_type; | |
83 | ||
84 | /// Default constructor. | |
85 | constexpr disallowed_t(); | |
86 | ||
87 | /// Get the value associated with a property object. | |
88 | /** | |
89 | * @returns disallowed_t(); | |
90 | */ | |
91 | static constexpr blocking_adaptation_t value(); | |
92 | }; | |
93 | ||
94 | /// A sub-property that indicates that automatic adaptation is allowed. | |
95 | struct allowed_t | |
96 | { | |
97 | /// The blocking_adaptation_t::allowed_t property applies to executors, | |
98 | /// senders, and schedulers. | |
99 | template <typename T> | |
100 | static constexpr bool is_applicable_property_v = | |
101 | is_executor_v<T> || is_sender_v<T> || is_scheduler_v<T>; | |
102 | ||
103 | /// The blocking_adaptation_t::allowed_t property can be required. | |
104 | static constexpr bool is_requirable = true; | |
105 | ||
106 | /// The blocking_adaptation_t::allowed_t property can be preferred. | |
107 | static constexpr bool is_preferable = false; | |
108 | ||
109 | /// The type returned by queries against an @c any_executor. | |
110 | typedef blocking_adaptation_t polymorphic_query_result_type; | |
111 | ||
112 | /// Default constructor. | |
113 | constexpr allowed_t(); | |
114 | ||
115 | /// Get the value associated with a property object. | |
116 | /** | |
117 | * @returns allowed_t(); | |
118 | */ | |
119 | static constexpr blocking_adaptation_t value(); | |
120 | }; | |
121 | ||
122 | /// A special value used for accessing the blocking_adaptation_t::disallowed_t | |
123 | /// property. | |
124 | static constexpr disallowed_t disallowed; | |
125 | ||
126 | /// A special value used for accessing the blocking_adaptation_t::allowed_t | |
127 | /// property. | |
128 | static constexpr allowed_t allowed; | |
129 | ||
130 | /// Default constructor. | |
131 | constexpr blocking_adaptation_t(); | |
132 | ||
133 | /// Construct from a sub-property value. | |
134 | constexpr blocking_adaptation_t(disallowed_t); | |
135 | ||
136 | /// Construct from a sub-property value. | |
137 | constexpr blocking_adaptation_t(allowed_t); | |
138 | ||
139 | /// Compare property values for equality. | |
140 | friend constexpr bool operator==( | |
141 | const blocking_adaptation_t& a, const blocking_adaptation_t& b) noexcept; | |
142 | ||
143 | /// Compare property values for inequality. | |
144 | friend constexpr bool operator!=( | |
145 | const blocking_adaptation_t& a, const blocking_adaptation_t& b) noexcept; | |
146 | }; | |
147 | ||
148 | /// A special value used for accessing the blocking_adaptation_t property. | |
149 | constexpr blocking_adaptation_t blocking_adaptation; | |
150 | ||
151 | } // namespace execution | |
152 | ||
153 | #else // defined(GENERATING_DOCUMENTATION) | |
154 | ||
155 | namespace execution { | |
156 | namespace detail { | |
157 | namespace blocking_adaptation { | |
158 | ||
159 | template <int I> struct disallowed_t; | |
160 | template <int I> struct allowed_t; | |
161 | ||
162 | } // namespace blocking_adaptation | |
163 | ||
164 | template <int I = 0> | |
165 | struct blocking_adaptation_t | |
166 | { | |
167 | #if defined(BOOST_ASIO_HAS_VARIABLE_TEMPLATES) | |
168 | template <typename T> | |
169 | BOOST_ASIO_STATIC_CONSTEXPR(bool, | |
170 | is_applicable_property_v = is_executor<T>::value | |
171 | || is_sender<T>::value || is_scheduler<T>::value); | |
172 | #endif // defined(BOOST_ASIO_HAS_VARIABLE_TEMPLATES) | |
173 | ||
174 | BOOST_ASIO_STATIC_CONSTEXPR(bool, is_requirable = false); | |
175 | BOOST_ASIO_STATIC_CONSTEXPR(bool, is_preferable = false); | |
176 | typedef blocking_adaptation_t polymorphic_query_result_type; | |
177 | ||
178 | typedef detail::blocking_adaptation::disallowed_t<I> disallowed_t; | |
179 | typedef detail::blocking_adaptation::allowed_t<I> allowed_t; | |
180 | ||
181 | BOOST_ASIO_CONSTEXPR blocking_adaptation_t() | |
182 | : value_(-1) | |
183 | { | |
184 | } | |
185 | ||
186 | BOOST_ASIO_CONSTEXPR blocking_adaptation_t(disallowed_t) | |
187 | : value_(0) | |
188 | { | |
189 | } | |
190 | ||
191 | BOOST_ASIO_CONSTEXPR blocking_adaptation_t(allowed_t) | |
192 | : value_(1) | |
193 | { | |
194 | } | |
195 | ||
196 | #if defined(BOOST_ASIO_HAS_DEDUCED_STATIC_QUERY_TRAIT) \ | |
197 | && defined(BOOST_ASIO_HAS_SFINAE_VARIABLE_TEMPLATES) | |
198 | template <typename T> | |
199 | static BOOST_ASIO_CONSTEXPR | |
200 | typename traits::query_static_constexpr_member< | |
201 | T, blocking_adaptation_t>::result_type | |
202 | static_query() | |
203 | BOOST_ASIO_NOEXCEPT_IF(( | |
204 | traits::query_static_constexpr_member< | |
205 | T, blocking_adaptation_t | |
206 | >::is_noexcept)) | |
207 | { | |
208 | return traits::query_static_constexpr_member< | |
209 | T, blocking_adaptation_t>::value(); | |
210 | } | |
211 | ||
212 | template <typename T> | |
213 | static BOOST_ASIO_CONSTEXPR | |
214 | typename traits::static_query<T, disallowed_t>::result_type | |
215 | static_query( | |
216 | typename enable_if< | |
217 | !traits::query_static_constexpr_member< | |
218 | T, blocking_adaptation_t>::is_valid | |
219 | && !traits::query_member<T, blocking_adaptation_t>::is_valid | |
220 | && traits::static_query<T, disallowed_t>::is_valid | |
221 | >::type* = 0) BOOST_ASIO_NOEXCEPT | |
222 | { | |
223 | return traits::static_query<T, disallowed_t>::value(); | |
224 | } | |
225 | ||
226 | template <typename T> | |
227 | static BOOST_ASIO_CONSTEXPR | |
228 | typename traits::static_query<T, allowed_t>::result_type | |
229 | static_query( | |
230 | typename enable_if< | |
231 | !traits::query_static_constexpr_member< | |
232 | T, blocking_adaptation_t>::is_valid | |
233 | && !traits::query_member<T, blocking_adaptation_t>::is_valid | |
234 | && !traits::static_query<T, disallowed_t>::is_valid | |
235 | && traits::static_query<T, allowed_t>::is_valid | |
236 | >::type* = 0) BOOST_ASIO_NOEXCEPT | |
237 | { | |
238 | return traits::static_query<T, allowed_t>::value(); | |
239 | } | |
240 | ||
241 | template <typename E, | |
242 | typename T = decltype(blocking_adaptation_t::static_query<E>())> | |
243 | static BOOST_ASIO_CONSTEXPR const T static_query_v | |
244 | = blocking_adaptation_t::static_query<E>(); | |
245 | #endif // defined(BOOST_ASIO_HAS_DEDUCED_STATIC_QUERY_TRAIT) | |
246 | // && defined(BOOST_ASIO_HAS_SFINAE_VARIABLE_TEMPLATES) | |
247 | ||
248 | friend BOOST_ASIO_CONSTEXPR bool operator==( | |
249 | const blocking_adaptation_t& a, const blocking_adaptation_t& b) | |
250 | { | |
251 | return a.value_ == b.value_; | |
252 | } | |
253 | ||
254 | friend BOOST_ASIO_CONSTEXPR bool operator!=( | |
255 | const blocking_adaptation_t& a, const blocking_adaptation_t& b) | |
256 | { | |
257 | return a.value_ != b.value_; | |
258 | } | |
259 | ||
260 | struct convertible_from_blocking_adaptation_t | |
261 | { | |
262 | BOOST_ASIO_CONSTEXPR convertible_from_blocking_adaptation_t( | |
263 | blocking_adaptation_t) | |
264 | { | |
265 | } | |
266 | }; | |
267 | ||
268 | template <typename Executor> | |
269 | friend BOOST_ASIO_CONSTEXPR blocking_adaptation_t query( | |
270 | const Executor& ex, convertible_from_blocking_adaptation_t, | |
271 | typename enable_if< | |
272 | can_query<const Executor&, disallowed_t>::value | |
273 | >::type* = 0) | |
274 | #if !defined(__clang__) // Clang crashes if noexcept is used here. | |
275 | #if defined(BOOST_ASIO_MSVC) // Visual C++ wants the type to be qualified. | |
276 | BOOST_ASIO_NOEXCEPT_IF(( | |
277 | is_nothrow_query<const Executor&, | |
278 | blocking_adaptation_t<>::disallowed_t>::value)) | |
279 | #else // defined(BOOST_ASIO_MSVC) | |
280 | BOOST_ASIO_NOEXCEPT_IF(( | |
281 | is_nothrow_query<const Executor&, disallowed_t>::value)) | |
282 | #endif // defined(BOOST_ASIO_MSVC) | |
283 | #endif // !defined(__clang__) | |
284 | { | |
285 | return boost::asio::query(ex, disallowed_t()); | |
286 | } | |
287 | ||
288 | template <typename Executor> | |
289 | friend BOOST_ASIO_CONSTEXPR blocking_adaptation_t query( | |
290 | const Executor& ex, convertible_from_blocking_adaptation_t, | |
291 | typename enable_if< | |
292 | !can_query<const Executor&, disallowed_t>::value | |
293 | && can_query<const Executor&, allowed_t>::value | |
294 | >::type* = 0) | |
295 | #if !defined(__clang__) // Clang crashes if noexcept is used here. | |
296 | #if defined(BOOST_ASIO_MSVC) // Visual C++ wants the type to be qualified. | |
297 | BOOST_ASIO_NOEXCEPT_IF(( | |
298 | is_nothrow_query<const Executor&, | |
299 | blocking_adaptation_t<>::allowed_t>::value)) | |
300 | #else // defined(BOOST_ASIO_MSVC) | |
301 | BOOST_ASIO_NOEXCEPT_IF(( | |
302 | is_nothrow_query<const Executor&, allowed_t>::value)) | |
303 | #endif // defined(BOOST_ASIO_MSVC) | |
304 | #endif // !defined(__clang__) | |
305 | { | |
306 | return boost::asio::query(ex, allowed_t()); | |
307 | } | |
308 | ||
309 | BOOST_ASIO_STATIC_CONSTEXPR_DEFAULT_INIT(disallowed_t, disallowed); | |
310 | BOOST_ASIO_STATIC_CONSTEXPR_DEFAULT_INIT(allowed_t, allowed); | |
311 | ||
312 | #if !defined(BOOST_ASIO_HAS_CONSTEXPR) | |
313 | static const blocking_adaptation_t instance; | |
314 | #endif // !defined(BOOST_ASIO_HAS_CONSTEXPR) | |
315 | ||
316 | private: | |
317 | int value_; | |
318 | }; | |
319 | ||
320 | #if defined(BOOST_ASIO_HAS_DEDUCED_STATIC_QUERY_TRAIT) \ | |
321 | && defined(BOOST_ASIO_HAS_SFINAE_VARIABLE_TEMPLATES) | |
322 | template <int I> template <typename E, typename T> | |
323 | const T blocking_adaptation_t<I>::static_query_v; | |
324 | #endif // defined(BOOST_ASIO_HAS_DEDUCED_STATIC_QUERY_TRAIT) | |
325 | // && defined(BOOST_ASIO_HAS_SFINAE_VARIABLE_TEMPLATES) | |
326 | ||
327 | #if !defined(BOOST_ASIO_HAS_CONSTEXPR) | |
328 | template <int I> | |
329 | const blocking_adaptation_t<I> blocking_adaptation_t<I>::instance; | |
330 | #endif | |
331 | ||
332 | template <int I> | |
333 | const typename blocking_adaptation_t<I>::disallowed_t | |
334 | blocking_adaptation_t<I>::disallowed; | |
335 | ||
336 | template <int I> | |
337 | const typename blocking_adaptation_t<I>::allowed_t | |
338 | blocking_adaptation_t<I>::allowed; | |
339 | ||
340 | namespace blocking_adaptation { | |
341 | ||
342 | template <int I = 0> | |
343 | struct disallowed_t | |
344 | { | |
345 | #if defined(BOOST_ASIO_HAS_VARIABLE_TEMPLATES) | |
346 | template <typename T> | |
347 | BOOST_ASIO_STATIC_CONSTEXPR(bool, | |
348 | is_applicable_property_v = is_executor<T>::value | |
349 | || is_sender<T>::value || is_scheduler<T>::value); | |
350 | #endif // defined(BOOST_ASIO_HAS_VARIABLE_TEMPLATES) | |
351 | ||
352 | BOOST_ASIO_STATIC_CONSTEXPR(bool, is_requirable = true); | |
353 | BOOST_ASIO_STATIC_CONSTEXPR(bool, is_preferable = true); | |
354 | typedef blocking_adaptation_t<I> polymorphic_query_result_type; | |
355 | ||
356 | BOOST_ASIO_CONSTEXPR disallowed_t() | |
357 | { | |
358 | } | |
359 | ||
360 | #if defined(BOOST_ASIO_HAS_DEDUCED_STATIC_QUERY_TRAIT) \ | |
361 | && defined(BOOST_ASIO_HAS_SFINAE_VARIABLE_TEMPLATES) | |
362 | template <typename T> | |
363 | static BOOST_ASIO_CONSTEXPR | |
364 | typename traits::query_static_constexpr_member<T, disallowed_t>::result_type | |
365 | static_query() | |
366 | BOOST_ASIO_NOEXCEPT_IF(( | |
367 | traits::query_static_constexpr_member<T, disallowed_t>::is_noexcept)) | |
368 | { | |
369 | return traits::query_static_constexpr_member<T, disallowed_t>::value(); | |
370 | } | |
371 | ||
372 | template <typename T> | |
373 | static BOOST_ASIO_CONSTEXPR disallowed_t static_query( | |
374 | typename enable_if< | |
375 | !traits::query_static_constexpr_member<T, disallowed_t>::is_valid | |
376 | && !traits::query_member<T, disallowed_t>::is_valid | |
377 | && !traits::query_free<T, disallowed_t>::is_valid | |
378 | && !can_query<T, allowed_t<I> >::value | |
379 | >::type* = 0) BOOST_ASIO_NOEXCEPT | |
380 | { | |
381 | return disallowed_t(); | |
382 | } | |
383 | ||
384 | template <typename E, typename T = decltype(disallowed_t::static_query<E>())> | |
385 | static BOOST_ASIO_CONSTEXPR const T static_query_v | |
386 | = disallowed_t::static_query<E>(); | |
387 | #endif // defined(BOOST_ASIO_HAS_DEDUCED_STATIC_QUERY_TRAIT) | |
388 | // && defined(BOOST_ASIO_HAS_SFINAE_VARIABLE_TEMPLATES) | |
389 | ||
390 | static BOOST_ASIO_CONSTEXPR blocking_adaptation_t<I> value() | |
391 | { | |
392 | return disallowed_t(); | |
393 | } | |
394 | ||
395 | friend BOOST_ASIO_CONSTEXPR bool operator==( | |
396 | const disallowed_t&, const disallowed_t&) | |
397 | { | |
398 | return true; | |
399 | } | |
400 | ||
401 | friend BOOST_ASIO_CONSTEXPR bool operator!=( | |
402 | const disallowed_t&, const disallowed_t&) | |
403 | { | |
404 | return false; | |
405 | } | |
406 | }; | |
407 | ||
408 | #if defined(BOOST_ASIO_HAS_DEDUCED_STATIC_QUERY_TRAIT) \ | |
409 | && defined(BOOST_ASIO_HAS_SFINAE_VARIABLE_TEMPLATES) | |
410 | template <int I> template <typename E, typename T> | |
411 | const T disallowed_t<I>::static_query_v; | |
412 | #endif // defined(BOOST_ASIO_HAS_DEDUCED_STATIC_QUERY_TRAIT) | |
413 | // && defined(BOOST_ASIO_HAS_SFINAE_VARIABLE_TEMPLATES) | |
414 | ||
415 | template <typename Executor> | |
416 | class adapter | |
417 | { | |
418 | public: | |
419 | adapter(int, const Executor& e) BOOST_ASIO_NOEXCEPT | |
420 | : executor_(e) | |
421 | { | |
422 | } | |
423 | ||
424 | adapter(const adapter& other) BOOST_ASIO_NOEXCEPT | |
425 | : executor_(other.executor_) | |
426 | { | |
427 | } | |
428 | ||
429 | #if defined(BOOST_ASIO_HAS_MOVE) | |
430 | adapter(adapter&& other) BOOST_ASIO_NOEXCEPT | |
431 | : executor_(BOOST_ASIO_MOVE_CAST(Executor)(other.executor_)) | |
432 | { | |
433 | } | |
434 | #endif // defined(BOOST_ASIO_HAS_MOVE) || defined(GENERATING_DOCUMENTATION) | |
435 | ||
436 | template <int I> | |
437 | static BOOST_ASIO_CONSTEXPR allowed_t<I> query( | |
438 | blocking_adaptation_t<I>) BOOST_ASIO_NOEXCEPT | |
439 | { | |
440 | return allowed_t<I>(); | |
441 | } | |
442 | ||
443 | template <int I> | |
444 | static BOOST_ASIO_CONSTEXPR allowed_t<I> query( | |
445 | allowed_t<I>) BOOST_ASIO_NOEXCEPT | |
446 | { | |
447 | return allowed_t<I>(); | |
448 | } | |
449 | ||
450 | template <int I> | |
451 | static BOOST_ASIO_CONSTEXPR allowed_t<I> query( | |
452 | disallowed_t<I>) BOOST_ASIO_NOEXCEPT | |
453 | { | |
454 | return allowed_t<I>(); | |
455 | } | |
456 | ||
457 | template <typename Property> | |
458 | typename enable_if< | |
459 | can_query<const Executor&, Property>::value, | |
460 | typename query_result<const Executor&, Property>::type | |
461 | >::type query(const Property& p) const | |
462 | BOOST_ASIO_NOEXCEPT_IF(( | |
463 | is_nothrow_query<const Executor&, Property>::value)) | |
464 | { | |
465 | return boost::asio::query(executor_, p); | |
466 | } | |
467 | ||
468 | template <int I> | |
469 | Executor require(disallowed_t<I>) const BOOST_ASIO_NOEXCEPT | |
470 | { | |
471 | return executor_; | |
472 | } | |
473 | ||
474 | template <typename Property> | |
475 | typename enable_if< | |
476 | can_require<const Executor&, Property>::value, | |
477 | adapter<typename decay< | |
478 | typename require_result<const Executor&, Property>::type | |
479 | >::type> | |
480 | >::type require(const Property& p) const | |
481 | BOOST_ASIO_NOEXCEPT_IF(( | |
482 | is_nothrow_require<const Executor&, Property>::value)) | |
483 | { | |
484 | return adapter<typename decay< | |
485 | typename require_result<const Executor&, Property>::type | |
486 | >::type>(0, boost::asio::require(executor_, p)); | |
487 | } | |
488 | ||
489 | template <typename Property> | |
490 | typename enable_if< | |
491 | can_prefer<const Executor&, Property>::value, | |
492 | adapter<typename decay< | |
493 | typename prefer_result<const Executor&, Property>::type | |
494 | >::type> | |
495 | >::type prefer(const Property& p) const | |
496 | BOOST_ASIO_NOEXCEPT_IF(( | |
497 | is_nothrow_prefer<const Executor&, Property>::value)) | |
498 | { | |
499 | return adapter<typename decay< | |
500 | typename prefer_result<const Executor&, Property>::type | |
501 | >::type>(0, boost::asio::prefer(executor_, p)); | |
502 | } | |
503 | ||
504 | template <typename Function> | |
505 | typename enable_if< | |
506 | execution::can_execute<const Executor&, Function>::value | |
507 | >::type execute(BOOST_ASIO_MOVE_ARG(Function) f) const | |
508 | { | |
509 | execution::execute(executor_, BOOST_ASIO_MOVE_CAST(Function)(f)); | |
510 | } | |
511 | ||
512 | friend bool operator==(const adapter& a, const adapter& b) BOOST_ASIO_NOEXCEPT | |
513 | { | |
514 | return a.executor_ == b.executor_; | |
515 | } | |
516 | ||
517 | friend bool operator!=(const adapter& a, const adapter& b) BOOST_ASIO_NOEXCEPT | |
518 | { | |
519 | return a.executor_ != b.executor_; | |
520 | } | |
521 | ||
522 | private: | |
523 | Executor executor_; | |
524 | }; | |
525 | ||
526 | template <int I = 0> | |
527 | struct allowed_t | |
528 | { | |
529 | #if defined(BOOST_ASIO_HAS_VARIABLE_TEMPLATES) | |
530 | template <typename T> | |
531 | BOOST_ASIO_STATIC_CONSTEXPR(bool, | |
532 | is_applicable_property_v = is_executor<T>::value | |
533 | || is_sender<T>::value || is_scheduler<T>::value); | |
534 | #endif // defined(BOOST_ASIO_HAS_VARIABLE_TEMPLATES) | |
535 | ||
536 | BOOST_ASIO_STATIC_CONSTEXPR(bool, is_requirable = true); | |
537 | BOOST_ASIO_STATIC_CONSTEXPR(bool, is_preferable = false); | |
538 | typedef blocking_adaptation_t<I> polymorphic_query_result_type; | |
539 | ||
540 | BOOST_ASIO_CONSTEXPR allowed_t() | |
541 | { | |
542 | } | |
543 | ||
544 | #if defined(BOOST_ASIO_HAS_DEDUCED_STATIC_QUERY_TRAIT) \ | |
545 | && defined(BOOST_ASIO_HAS_SFINAE_VARIABLE_TEMPLATES) | |
546 | template <typename T> | |
547 | static BOOST_ASIO_CONSTEXPR | |
548 | typename traits::query_static_constexpr_member<T, allowed_t>::result_type | |
549 | static_query() | |
550 | BOOST_ASIO_NOEXCEPT_IF(( | |
551 | traits::query_static_constexpr_member<T, allowed_t>::is_noexcept)) | |
552 | { | |
553 | return traits::query_static_constexpr_member<T, allowed_t>::value(); | |
554 | } | |
555 | ||
556 | template <typename E, typename T = decltype(allowed_t::static_query<E>())> | |
557 | static BOOST_ASIO_CONSTEXPR const T static_query_v | |
558 | = allowed_t::static_query<E>(); | |
559 | #endif // defined(BOOST_ASIO_HAS_DEDUCED_STATIC_QUERY_TRAIT) | |
560 | // && defined(BOOST_ASIO_HAS_SFINAE_VARIABLE_TEMPLATES) | |
561 | ||
562 | static BOOST_ASIO_CONSTEXPR blocking_adaptation_t<I> value() | |
563 | { | |
564 | return allowed_t(); | |
565 | } | |
566 | ||
567 | friend BOOST_ASIO_CONSTEXPR bool operator==( | |
568 | const allowed_t&, const allowed_t&) | |
569 | { | |
570 | return true; | |
571 | } | |
572 | ||
573 | friend BOOST_ASIO_CONSTEXPR bool operator!=( | |
574 | const allowed_t&, const allowed_t&) | |
575 | { | |
576 | return false; | |
577 | } | |
578 | ||
579 | template <typename Executor> | |
580 | friend adapter<Executor> require( | |
581 | const Executor& e, const allowed_t&, | |
582 | typename enable_if< | |
583 | is_executor<Executor>::value | |
584 | >::type* = 0) | |
585 | { | |
586 | return adapter<Executor>(0, e); | |
587 | } | |
588 | }; | |
589 | ||
590 | #if defined(BOOST_ASIO_HAS_DEDUCED_STATIC_QUERY_TRAIT) \ | |
591 | && defined(BOOST_ASIO_HAS_SFINAE_VARIABLE_TEMPLATES) | |
592 | template <int I> template <typename E, typename T> | |
593 | const T allowed_t<I>::static_query_v; | |
594 | #endif // defined(BOOST_ASIO_HAS_DEDUCED_STATIC_QUERY_TRAIT) | |
595 | // && defined(BOOST_ASIO_HAS_SFINAE_VARIABLE_TEMPLATES) | |
596 | ||
597 | template <typename Function> | |
598 | class blocking_execute_state | |
599 | { | |
600 | public: | |
601 | template <typename F> | |
602 | blocking_execute_state(BOOST_ASIO_MOVE_ARG(F) f) | |
603 | : func_(BOOST_ASIO_MOVE_CAST(F)(f)), | |
604 | is_complete_(false) | |
605 | { | |
606 | } | |
607 | ||
608 | template <typename Executor> | |
609 | void execute_and_wait(BOOST_ASIO_MOVE_ARG(Executor) ex) | |
610 | { | |
611 | handler h = { this }; | |
612 | execution::execute(BOOST_ASIO_MOVE_CAST(Executor)(ex), h); | |
613 | boost::asio::detail::mutex::scoped_lock lock(mutex_); | |
614 | while (!is_complete_) | |
615 | event_.wait(lock); | |
616 | } | |
617 | ||
618 | struct cleanup | |
619 | { | |
620 | ~cleanup() | |
621 | { | |
622 | boost::asio::detail::mutex::scoped_lock lock(state_->mutex_); | |
623 | state_->is_complete_ = true; | |
624 | state_->event_.unlock_and_signal_one_for_destruction(lock); | |
625 | } | |
626 | ||
627 | blocking_execute_state* state_; | |
628 | }; | |
629 | ||
630 | struct handler | |
631 | { | |
632 | void operator()() | |
633 | { | |
634 | cleanup c = { state_ }; | |
635 | state_->func_(); | |
636 | } | |
637 | ||
638 | blocking_execute_state* state_; | |
639 | }; | |
640 | ||
641 | Function func_; | |
642 | boost::asio::detail::mutex mutex_; | |
643 | boost::asio::detail::event event_; | |
644 | bool is_complete_; | |
645 | }; | |
646 | ||
647 | template <typename Executor, typename Function> | |
648 | void blocking_execute( | |
649 | BOOST_ASIO_MOVE_ARG(Executor) ex, | |
650 | BOOST_ASIO_MOVE_ARG(Function) func) | |
651 | { | |
652 | typedef typename decay<Function>::type func_t; | |
653 | blocking_execute_state<func_t> state(BOOST_ASIO_MOVE_CAST(Function)(func)); | |
654 | state.execute_and_wait(ex); | |
655 | } | |
656 | ||
657 | } // namespace blocking_adaptation | |
658 | } // namespace detail | |
659 | ||
660 | typedef detail::blocking_adaptation_t<> blocking_adaptation_t; | |
661 | ||
662 | #if defined(BOOST_ASIO_HAS_CONSTEXPR) || defined(GENERATING_DOCUMENTATION) | |
663 | constexpr blocking_adaptation_t blocking_adaptation; | |
664 | #else // defined(BOOST_ASIO_HAS_CONSTEXPR) || defined(GENERATING_DOCUMENTATION) | |
665 | namespace { static const blocking_adaptation_t& | |
666 | blocking_adaptation = blocking_adaptation_t::instance; } | |
667 | #endif | |
668 | ||
669 | } // namespace execution | |
670 | ||
671 | #if !defined(BOOST_ASIO_HAS_VARIABLE_TEMPLATES) | |
672 | ||
673 | template <typename T> | |
674 | struct is_applicable_property<T, execution::blocking_adaptation_t> | |
675 | : integral_constant<bool, | |
676 | execution::is_executor<T>::value | |
677 | || execution::is_sender<T>::value | |
678 | || execution::is_scheduler<T>::value> | |
679 | { | |
680 | }; | |
681 | ||
682 | template <typename T> | |
683 | struct is_applicable_property<T, execution::blocking_adaptation_t::disallowed_t> | |
684 | : integral_constant<bool, | |
685 | execution::is_executor<T>::value | |
686 | || execution::is_sender<T>::value | |
687 | || execution::is_scheduler<T>::value> | |
688 | { | |
689 | }; | |
690 | ||
691 | template <typename T> | |
692 | struct is_applicable_property<T, execution::blocking_adaptation_t::allowed_t> | |
693 | : integral_constant<bool, | |
694 | execution::is_executor<T>::value | |
695 | || execution::is_sender<T>::value | |
696 | || execution::is_scheduler<T>::value> | |
697 | { | |
698 | }; | |
699 | ||
700 | #endif // !defined(BOOST_ASIO_HAS_VARIABLE_TEMPLATES) | |
701 | ||
702 | namespace traits { | |
703 | ||
704 | #if !defined(BOOST_ASIO_HAS_DEDUCED_QUERY_FREE_TRAIT) | |
705 | ||
706 | template <typename T> | |
707 | struct query_free_default<T, execution::blocking_adaptation_t, | |
708 | typename enable_if< | |
709 | can_query<T, execution::blocking_adaptation_t::disallowed_t>::value | |
710 | >::type> | |
711 | { | |
712 | BOOST_ASIO_STATIC_CONSTEXPR(bool, is_valid = true); | |
713 | BOOST_ASIO_STATIC_CONSTEXPR(bool, is_noexcept = (is_nothrow_query<T, | |
714 | execution::blocking_adaptation_t::disallowed_t>::value)); | |
715 | ||
716 | typedef execution::blocking_adaptation_t result_type; | |
717 | }; | |
718 | ||
719 | template <typename T> | |
720 | struct query_free_default<T, execution::blocking_adaptation_t, | |
721 | typename enable_if< | |
722 | !can_query<T, execution::blocking_adaptation_t::disallowed_t>::value | |
723 | && can_query<T, execution::blocking_adaptation_t::allowed_t>::value | |
724 | >::type> | |
725 | { | |
726 | BOOST_ASIO_STATIC_CONSTEXPR(bool, is_valid = true); | |
727 | BOOST_ASIO_STATIC_CONSTEXPR(bool, is_noexcept = | |
728 | (is_nothrow_query<T, execution::blocking_adaptation_t::allowed_t>::value)); | |
729 | ||
730 | typedef execution::blocking_adaptation_t result_type; | |
731 | }; | |
732 | ||
733 | #endif // !defined(BOOST_ASIO_HAS_DEDUCED_QUERY_FREE_TRAIT) | |
734 | ||
735 | #if !defined(BOOST_ASIO_HAS_DEDUCED_STATIC_QUERY_TRAIT) \ | |
736 | || !defined(BOOST_ASIO_HAS_SFINAE_VARIABLE_TEMPLATES) | |
737 | ||
738 | template <typename T> | |
739 | struct static_query<T, execution::blocking_adaptation_t, | |
740 | typename enable_if< | |
741 | traits::query_static_constexpr_member<T, | |
742 | execution::blocking_adaptation_t>::is_valid | |
743 | >::type> | |
744 | { | |
745 | BOOST_ASIO_STATIC_CONSTEXPR(bool, is_valid = true); | |
746 | BOOST_ASIO_STATIC_CONSTEXPR(bool, is_noexcept = true); | |
747 | ||
748 | typedef typename traits::query_static_constexpr_member<T, | |
749 | execution::blocking_adaptation_t>::result_type result_type; | |
750 | ||
751 | static BOOST_ASIO_CONSTEXPR result_type value() | |
752 | { | |
753 | return traits::query_static_constexpr_member<T, | |
754 | execution::blocking_adaptation_t>::value(); | |
755 | } | |
756 | }; | |
757 | ||
758 | template <typename T> | |
759 | struct static_query<T, execution::blocking_adaptation_t, | |
760 | typename enable_if< | |
761 | !traits::query_static_constexpr_member<T, | |
762 | execution::blocking_adaptation_t>::is_valid | |
763 | && !traits::query_member<T, | |
764 | execution::blocking_adaptation_t>::is_valid | |
765 | && traits::static_query<T, | |
766 | execution::blocking_adaptation_t::disallowed_t>::is_valid | |
767 | >::type> | |
768 | { | |
769 | BOOST_ASIO_STATIC_CONSTEXPR(bool, is_valid = true); | |
770 | BOOST_ASIO_STATIC_CONSTEXPR(bool, is_noexcept = true); | |
771 | ||
772 | typedef typename traits::static_query<T, | |
773 | execution::blocking_adaptation_t::disallowed_t>::result_type result_type; | |
774 | ||
775 | static BOOST_ASIO_CONSTEXPR result_type value() | |
776 | { | |
777 | return traits::static_query<T, | |
778 | execution::blocking_adaptation_t::disallowed_t>::value(); | |
779 | } | |
780 | }; | |
781 | ||
782 | template <typename T> | |
783 | struct static_query<T, execution::blocking_adaptation_t, | |
784 | typename enable_if< | |
785 | !traits::query_static_constexpr_member<T, | |
786 | execution::blocking_adaptation_t>::is_valid | |
787 | && !traits::query_member<T, | |
788 | execution::blocking_adaptation_t>::is_valid | |
789 | && !traits::static_query<T, | |
790 | execution::blocking_adaptation_t::disallowed_t>::is_valid | |
791 | && traits::static_query<T, | |
792 | execution::blocking_adaptation_t::allowed_t>::is_valid | |
793 | >::type> | |
794 | { | |
795 | BOOST_ASIO_STATIC_CONSTEXPR(bool, is_valid = true); | |
796 | BOOST_ASIO_STATIC_CONSTEXPR(bool, is_noexcept = true); | |
797 | ||
798 | typedef typename traits::static_query<T, | |
799 | execution::blocking_adaptation_t::allowed_t>::result_type result_type; | |
800 | ||
801 | static BOOST_ASIO_CONSTEXPR result_type value() | |
802 | { | |
803 | return traits::static_query<T, | |
804 | execution::blocking_adaptation_t::allowed_t>::value(); | |
805 | } | |
806 | }; | |
807 | ||
808 | template <typename T> | |
809 | struct static_query<T, execution::blocking_adaptation_t::disallowed_t, | |
810 | typename enable_if< | |
811 | traits::query_static_constexpr_member<T, | |
812 | execution::blocking_adaptation_t::disallowed_t>::is_valid | |
813 | >::type> | |
814 | { | |
815 | BOOST_ASIO_STATIC_CONSTEXPR(bool, is_valid = true); | |
816 | BOOST_ASIO_STATIC_CONSTEXPR(bool, is_noexcept = true); | |
817 | ||
818 | typedef typename traits::query_static_constexpr_member<T, | |
819 | execution::blocking_adaptation_t::disallowed_t>::result_type result_type; | |
820 | ||
821 | static BOOST_ASIO_CONSTEXPR result_type value() | |
822 | { | |
823 | return traits::query_static_constexpr_member<T, | |
824 | execution::blocking_adaptation_t::disallowed_t>::value(); | |
825 | } | |
826 | }; | |
827 | ||
828 | template <typename T> | |
829 | struct static_query<T, execution::blocking_adaptation_t::disallowed_t, | |
830 | typename enable_if< | |
831 | !traits::query_static_constexpr_member<T, | |
832 | execution::blocking_adaptation_t::disallowed_t>::is_valid | |
833 | && !traits::query_member<T, | |
834 | execution::blocking_adaptation_t::disallowed_t>::is_valid | |
835 | && !traits::query_free<T, | |
836 | execution::blocking_adaptation_t::disallowed_t>::is_valid | |
837 | && !can_query<T, execution::blocking_adaptation_t::allowed_t>::value | |
838 | >::type> | |
839 | { | |
840 | BOOST_ASIO_STATIC_CONSTEXPR(bool, is_valid = true); | |
841 | BOOST_ASIO_STATIC_CONSTEXPR(bool, is_noexcept = true); | |
842 | ||
843 | typedef execution::blocking_adaptation_t::disallowed_t result_type; | |
844 | ||
845 | static BOOST_ASIO_CONSTEXPR result_type value() | |
846 | { | |
847 | return result_type(); | |
848 | } | |
849 | }; | |
850 | ||
851 | template <typename T> | |
852 | struct static_query<T, execution::blocking_adaptation_t::allowed_t, | |
853 | typename enable_if< | |
854 | traits::query_static_constexpr_member<T, | |
855 | execution::blocking_adaptation_t::allowed_t>::is_valid | |
856 | >::type> | |
857 | { | |
858 | BOOST_ASIO_STATIC_CONSTEXPR(bool, is_valid = true); | |
859 | BOOST_ASIO_STATIC_CONSTEXPR(bool, is_noexcept = true); | |
860 | ||
861 | typedef typename traits::query_static_constexpr_member<T, | |
862 | execution::blocking_adaptation_t::allowed_t>::result_type result_type; | |
863 | ||
864 | static BOOST_ASIO_CONSTEXPR result_type value() | |
865 | { | |
866 | return traits::query_static_constexpr_member<T, | |
867 | execution::blocking_adaptation_t::allowed_t>::value(); | |
868 | } | |
869 | }; | |
870 | ||
871 | #endif // !defined(BOOST_ASIO_HAS_DEDUCED_STATIC_QUERY_TRAIT) | |
872 | // || !defined(BOOST_ASIO_HAS_SFINAE_VARIABLE_TEMPLATES) | |
873 | ||
874 | #if !defined(BOOST_ASIO_HAS_DEDUCED_STATIC_REQUIRE_TRAIT) | |
875 | ||
876 | template <typename T> | |
877 | struct static_require<T, execution::blocking_adaptation_t::disallowed_t, | |
878 | typename enable_if< | |
879 | static_query<T, execution::blocking_adaptation_t::disallowed_t>::is_valid | |
880 | >::type> | |
881 | { | |
882 | BOOST_ASIO_STATIC_CONSTEXPR(bool, is_valid = | |
883 | (is_same<typename static_query<T, | |
884 | execution::blocking_adaptation_t::disallowed_t>::result_type, | |
885 | execution::blocking_adaptation_t::disallowed_t>::value)); | |
886 | }; | |
887 | ||
888 | template <typename T> | |
889 | struct static_require<T, execution::blocking_adaptation_t::allowed_t, | |
890 | typename enable_if< | |
891 | static_query<T, execution::blocking_adaptation_t::allowed_t>::is_valid | |
892 | >::type> | |
893 | { | |
894 | BOOST_ASIO_STATIC_CONSTEXPR(bool, is_valid = | |
895 | (is_same<typename static_query<T, | |
896 | execution::blocking_adaptation_t::allowed_t>::result_type, | |
897 | execution::blocking_adaptation_t::allowed_t>::value)); | |
898 | }; | |
899 | ||
900 | #endif // !defined(BOOST_ASIO_HAS_DEDUCED_STATIC_REQUIRE_TRAIT) | |
901 | ||
902 | #if !defined(BOOST_ASIO_HAS_DEDUCED_REQUIRE_FREE_TRAIT) | |
903 | ||
904 | template <typename T> | |
905 | struct require_free_default<T, execution::blocking_adaptation_t::allowed_t, | |
906 | typename enable_if< | |
907 | is_same<T, typename decay<T>::type>::value | |
908 | && execution::is_executor<T>::value | |
909 | >::type> | |
910 | { | |
911 | BOOST_ASIO_STATIC_CONSTEXPR(bool, is_valid = true); | |
912 | BOOST_ASIO_STATIC_CONSTEXPR(bool, is_noexcept = false); | |
913 | typedef execution::detail::blocking_adaptation::adapter<T> result_type; | |
914 | }; | |
915 | ||
916 | #endif // !defined(BOOST_ASIO_HAS_DEDUCED_REQUIRE_FREE_TRAIT) | |
917 | ||
918 | #if !defined(BOOST_ASIO_HAS_DEDUCED_EQUALITY_COMPARABLE_TRAIT) | |
919 | ||
920 | template <typename Executor> | |
921 | struct equality_comparable< | |
922 | execution::detail::blocking_adaptation::adapter<Executor> > | |
923 | { | |
924 | BOOST_ASIO_STATIC_CONSTEXPR(bool, is_valid = true); | |
925 | BOOST_ASIO_STATIC_CONSTEXPR(bool, is_noexcept = true); | |
926 | }; | |
927 | ||
928 | #endif // !defined(BOOST_ASIO_HAS_DEDUCED_EQUALITY_COMPARABLE_TRAIT) | |
929 | ||
930 | #if !defined(BOOST_ASIO_HAS_DEDUCED_EXECUTE_MEMBER_TRAIT) | |
931 | ||
932 | template <typename Executor, typename Function> | |
933 | struct execute_member< | |
934 | execution::detail::blocking_adaptation::adapter<Executor>, Function> | |
935 | { | |
936 | BOOST_ASIO_STATIC_CONSTEXPR(bool, is_valid = true); | |
937 | BOOST_ASIO_STATIC_CONSTEXPR(bool, is_noexcept = false); | |
938 | typedef void result_type; | |
939 | }; | |
940 | ||
941 | #endif // !defined(BOOST_ASIO_HAS_DEDUCED_EXECUTE_MEMBER_TRAIT) | |
942 | ||
943 | #if !defined(BOOST_ASIO_HAS_DEDUCED_QUERY_STATIC_CONSTEXPR_MEMBER_TRAIT) | |
944 | ||
945 | template <typename Executor, int I> | |
946 | struct query_static_constexpr_member< | |
947 | execution::detail::blocking_adaptation::adapter<Executor>, | |
948 | execution::detail::blocking_adaptation_t<I> > | |
949 | { | |
950 | BOOST_ASIO_STATIC_CONSTEXPR(bool, is_valid = true); | |
951 | BOOST_ASIO_STATIC_CONSTEXPR(bool, is_noexcept = true); | |
952 | typedef execution::blocking_adaptation_t::allowed_t result_type; | |
953 | ||
954 | static BOOST_ASIO_CONSTEXPR result_type value() BOOST_ASIO_NOEXCEPT | |
955 | { | |
956 | return result_type(); | |
957 | } | |
958 | }; | |
959 | ||
960 | template <typename Executor, int I> | |
961 | struct query_static_constexpr_member< | |
962 | execution::detail::blocking_adaptation::adapter<Executor>, | |
963 | execution::detail::blocking_adaptation::allowed_t<I> > | |
964 | { | |
965 | BOOST_ASIO_STATIC_CONSTEXPR(bool, is_valid = true); | |
966 | BOOST_ASIO_STATIC_CONSTEXPR(bool, is_noexcept = true); | |
967 | typedef execution::blocking_adaptation_t::allowed_t result_type; | |
968 | ||
969 | static BOOST_ASIO_CONSTEXPR result_type value() BOOST_ASIO_NOEXCEPT | |
970 | { | |
971 | return result_type(); | |
972 | } | |
973 | }; | |
974 | ||
975 | template <typename Executor, int I> | |
976 | struct query_static_constexpr_member< | |
977 | execution::detail::blocking_adaptation::adapter<Executor>, | |
978 | execution::detail::blocking_adaptation::disallowed_t<I> > | |
979 | { | |
980 | BOOST_ASIO_STATIC_CONSTEXPR(bool, is_valid = true); | |
981 | BOOST_ASIO_STATIC_CONSTEXPR(bool, is_noexcept = true); | |
982 | typedef execution::blocking_adaptation_t::allowed_t result_type; | |
983 | ||
984 | static BOOST_ASIO_CONSTEXPR result_type value() BOOST_ASIO_NOEXCEPT | |
985 | { | |
986 | return result_type(); | |
987 | } | |
988 | }; | |
989 | ||
990 | #endif // !defined(BOOST_ASIO_HAS_DEDUCED_QUERY_STATIC_CONSTEXPR_MEMBER_TRAIT) | |
991 | ||
992 | #if !defined(BOOST_ASIO_HAS_DEDUCED_QUERY_MEMBER_TRAIT) | |
993 | ||
994 | template <typename Executor, typename Property> | |
995 | struct query_member< | |
996 | execution::detail::blocking_adaptation::adapter<Executor>, Property, | |
997 | typename enable_if< | |
998 | can_query<const Executor&, Property>::value | |
999 | >::type> | |
1000 | { | |
1001 | BOOST_ASIO_STATIC_CONSTEXPR(bool, is_valid = true); | |
1002 | BOOST_ASIO_STATIC_CONSTEXPR(bool, is_noexcept = | |
1003 | (is_nothrow_query<Executor, Property>::value)); | |
1004 | typedef typename query_result<Executor, Property>::type result_type; | |
1005 | }; | |
1006 | ||
1007 | #endif // !defined(BOOST_ASIO_HAS_DEDUCED_QUERY_MEMBER_TRAIT) | |
1008 | ||
1009 | #if !defined(BOOST_ASIO_HAS_DEDUCED_REQUIRE_MEMBER_TRAIT) | |
1010 | ||
1011 | template <typename Executor, int I> | |
1012 | struct require_member< | |
1013 | execution::detail::blocking_adaptation::adapter<Executor>, | |
1014 | execution::detail::blocking_adaptation::disallowed_t<I> > | |
1015 | { | |
1016 | BOOST_ASIO_STATIC_CONSTEXPR(bool, is_valid = true); | |
1017 | BOOST_ASIO_STATIC_CONSTEXPR(bool, is_noexcept = true); | |
1018 | typedef Executor result_type; | |
1019 | }; | |
1020 | ||
1021 | template <typename Executor, typename Property> | |
1022 | struct require_member< | |
1023 | execution::detail::blocking_adaptation::adapter<Executor>, Property, | |
1024 | typename enable_if< | |
1025 | can_require<const Executor&, Property>::value | |
1026 | >::type> | |
1027 | { | |
1028 | BOOST_ASIO_STATIC_CONSTEXPR(bool, is_valid = true); | |
1029 | BOOST_ASIO_STATIC_CONSTEXPR(bool, is_noexcept = | |
1030 | (is_nothrow_require<Executor, Property>::value)); | |
1031 | typedef execution::detail::blocking_adaptation::adapter<typename decay< | |
1032 | typename require_result<Executor, Property>::type | |
1033 | >::type> result_type; | |
1034 | }; | |
1035 | ||
1036 | #endif // !defined(BOOST_ASIO_HAS_DEDUCED_REQUIRE_MEMBER_TRAIT) | |
1037 | ||
1038 | #if !defined(BOOST_ASIO_HAS_DEDUCED_PREFER_MEMBER_TRAIT) | |
1039 | ||
1040 | template <typename Executor, typename Property> | |
1041 | struct prefer_member< | |
1042 | execution::detail::blocking_adaptation::adapter<Executor>, Property, | |
1043 | typename enable_if< | |
1044 | can_prefer<const Executor&, Property>::value | |
1045 | >::type> | |
1046 | { | |
1047 | BOOST_ASIO_STATIC_CONSTEXPR(bool, is_valid = true); | |
1048 | BOOST_ASIO_STATIC_CONSTEXPR(bool, is_noexcept = | |
1049 | (is_nothrow_prefer<Executor, Property>::value)); | |
1050 | typedef execution::detail::blocking_adaptation::adapter<typename decay< | |
1051 | typename prefer_result<Executor, Property>::type | |
1052 | >::type> result_type; | |
1053 | }; | |
1054 | ||
1055 | #endif // !defined(BOOST_ASIO_HAS_DEDUCED_PREFER_MEMBER_TRAIT) | |
1056 | ||
1057 | } // namespace traits | |
1058 | ||
1059 | #endif // defined(GENERATING_DOCUMENTATION) | |
1060 | ||
1061 | } // namespace asio | |
1062 | } // namespace boost | |
1063 | ||
1064 | #include <boost/asio/detail/pop_options.hpp> | |
1065 | ||
1066 | #endif // BOOST_ASIO_EXECUTION_BLOCKING_ADAPTATION_HPP |