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Diffstat (limited to '3rdparty/asio/include/asio/execution/blocking.hpp')
-rw-r--r-- | 3rdparty/asio/include/asio/execution/blocking.hpp | 1551 |
1 files changed, 1551 insertions, 0 deletions
diff --git a/3rdparty/asio/include/asio/execution/blocking.hpp b/3rdparty/asio/include/asio/execution/blocking.hpp new file mode 100644 index 00000000000..76a2eb523dc --- /dev/null +++ b/3rdparty/asio/include/asio/execution/blocking.hpp @@ -0,0 +1,1551 @@ +// +// execution/blocking.hpp +// ~~~~~~~~~~~~~~~~~~~~~~ +// +// Copyright (c) 2003-2021 Christopher M. Kohlhoff (chris at kohlhoff dot com) +// +// Distributed under the Boost Software License, Version 1.0. (See accompanying +// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) +// + +#ifndef ASIO_EXECUTION_BLOCKING_HPP +#define ASIO_EXECUTION_BLOCKING_HPP + +#if defined(_MSC_VER) && (_MSC_VER >= 1200) +# pragma once +#endif // defined(_MSC_VER) && (_MSC_VER >= 1200) + +#include "asio/detail/config.hpp" +#include "asio/detail/type_traits.hpp" +#include "asio/execution/execute.hpp" +#include "asio/execution/executor.hpp" +#include "asio/execution/scheduler.hpp" +#include "asio/execution/sender.hpp" +#include "asio/is_applicable_property.hpp" +#include "asio/prefer.hpp" +#include "asio/query.hpp" +#include "asio/require.hpp" +#include "asio/traits/query_free.hpp" +#include "asio/traits/query_member.hpp" +#include "asio/traits/query_static_constexpr_member.hpp" +#include "asio/traits/static_query.hpp" +#include "asio/traits/static_require.hpp" + +#include "asio/detail/push_options.hpp" + +namespace asio { + +#if defined(GENERATING_DOCUMENTATION) + +namespace execution { + +/// A property to describe what guarantees an executor makes about the blocking +/// behaviour of their execution functions. +struct blocking_t +{ + /// The blocking_t property applies to executors, senders, and schedulers. + template <typename T> + static constexpr bool is_applicable_property_v = + is_executor_v<T> || is_sender_v<T> || is_scheduler_v<T>; + + /// The top-level blocking_t property cannot be required. + static constexpr bool is_requirable = false; + + /// The top-level blocking_t property cannot be preferred. + static constexpr bool is_preferable = false; + + /// The type returned by queries against an @c any_executor. + typedef blocking_t polymorphic_query_result_type; + + /// A sub-property that indicates that invocation of an executor's execution + /// function may block pending completion of one or more invocations of the + /// submitted function object. + struct possibly_t + { + /// The blocking_t::possibly_t property applies to executors, senders, and + /// schedulers. + template <typename T> + static constexpr bool is_applicable_property_v = + is_executor_v<T> || is_sender_v<T> || is_scheduler_v<T>; + + /// The blocking_t::possibly_t property can be required. + static constexpr bool is_requirable = true; + + /// The blocking_t::possibly_t property can be preferred. + static constexpr bool is_preferable = true; + + /// The type returned by queries against an @c any_executor. + typedef blocking_t polymorphic_query_result_type; + + /// Default constructor. + constexpr possibly_t(); + + /// Get the value associated with a property object. + /** + * @returns possibly_t(); + */ + static constexpr blocking_t value(); + }; + + /// A sub-property that indicates that invocation of an executor's execution + /// function shall block until completion of all invocations of the submitted + /// function object. + struct always_t + { + /// The blocking_t::always_t property applies to executors, senders, and + /// schedulers. + template <typename T> + static constexpr bool is_applicable_property_v = + is_executor_v<T> || is_sender_v<T> || is_scheduler_v<T>; + + /// The blocking_t::always_t property can be required. + static constexpr bool is_requirable = true; + + /// The blocking_t::always_t property can be preferred. + static constexpr bool is_preferable = false; + + /// The type returned by queries against an @c any_executor. + typedef blocking_t polymorphic_query_result_type; + + /// Default constructor. + constexpr always_t(); + + /// Get the value associated with a property object. + /** + * @returns always_t(); + */ + static constexpr blocking_t value(); + }; + + /// A sub-property that indicates that invocation of an executor's execution + /// function shall not block pending completion of the invocations of the + /// submitted function object. + struct never_t + { + /// The blocking_t::never_t property applies to executors, senders, and + /// schedulers. + template <typename T> + static constexpr bool is_applicable_property_v = + is_executor_v<T> || is_sender_v<T> || is_scheduler_v<T>; + + /// The blocking_t::never_t property can be required. + static constexpr bool is_requirable = true; + + /// The blocking_t::never_t property can be preferred. + static constexpr bool is_preferable = true; + + /// The type returned by queries against an @c any_executor. + typedef blocking_t polymorphic_query_result_type; + + /// Default constructor. + constexpr never_t(); + + /// Get the value associated with a property object. + /** + * @returns never_t(); + */ + static constexpr blocking_t value(); + }; + + /// A special value used for accessing the blocking_t::possibly_t property. + static constexpr possibly_t possibly; + + /// A special value used for accessing the blocking_t::always_t property. + static constexpr always_t always; + + /// A special value used for accessing the blocking_t::never_t property. + static constexpr never_t never; + + /// Default constructor. + constexpr blocking_t(); + + /// Construct from a sub-property value. + constexpr blocking_t(possibly_t); + + /// Construct from a sub-property value. + constexpr blocking_t(always_t); + + /// Construct from a sub-property value. + constexpr blocking_t(never_t); + + /// Compare property values for equality. + friend constexpr bool operator==( + const blocking_t& a, const blocking_t& b) noexcept; + + /// Compare property values for inequality. + friend constexpr bool operator!=( + const blocking_t& a, const blocking_t& b) noexcept; +}; + +/// A special value used for accessing the blocking_t property. +constexpr blocking_t blocking; + +} // namespace execution + +#else // defined(GENERATING_DOCUMENTATION) + +namespace execution { +namespace detail { +namespace blocking { + +template <int I> struct possibly_t; +template <int I> struct always_t; +template <int I> struct never_t; + +} // namespace blocking +namespace blocking_adaptation { + +template <int I> struct allowed_t; + +template <typename Executor, typename Function> +void blocking_execute( + ASIO_MOVE_ARG(Executor) ex, + ASIO_MOVE_ARG(Function) func); + +} // namespace blocking_adaptation + +template <int I = 0> +struct blocking_t +{ +#if defined(ASIO_HAS_VARIABLE_TEMPLATES) + template <typename T> + ASIO_STATIC_CONSTEXPR(bool, + is_applicable_property_v = ( + is_executor<T>::value + || conditional< + is_executor<T>::value, + false_type, + is_sender<T> + >::type::value + || conditional< + is_executor<T>::value, + false_type, + is_scheduler<T> + >::type::value)); +#endif // defined(ASIO_HAS_VARIABLE_TEMPLATES) + + ASIO_STATIC_CONSTEXPR(bool, is_requirable = false); + ASIO_STATIC_CONSTEXPR(bool, is_preferable = false); + typedef blocking_t polymorphic_query_result_type; + + typedef detail::blocking::possibly_t<I> possibly_t; + typedef detail::blocking::always_t<I> always_t; + typedef detail::blocking::never_t<I> never_t; + + ASIO_CONSTEXPR blocking_t() + : value_(-1) + { + } + + ASIO_CONSTEXPR blocking_t(possibly_t) + : value_(0) + { + } + + ASIO_CONSTEXPR blocking_t(always_t) + : value_(1) + { + } + + ASIO_CONSTEXPR blocking_t(never_t) + : value_(2) + { + } + + template <typename T> + struct proxy + { +#if defined(ASIO_HAS_DEDUCED_QUERY_MEMBER_TRAIT) + struct type + { + template <typename P> + auto query(ASIO_MOVE_ARG(P) p) const + noexcept( + noexcept( + declval<typename conditional<true, T, P>::type>().query( + ASIO_MOVE_CAST(P)(p)) + ) + ) + -> decltype( + declval<typename conditional<true, T, P>::type>().query( + ASIO_MOVE_CAST(P)(p)) + ); + }; +#else // defined(ASIO_HAS_DEDUCED_QUERY_MEMBER_TRAIT) + typedef T type; +#endif // defined(ASIO_HAS_DEDUCED_QUERY_MEMBER_TRAIT) + }; + + template <typename T> + struct static_proxy + { +#if defined(ASIO_HAS_DEDUCED_QUERY_STATIC_CONSTEXPR_MEMBER_TRAIT) + struct type + { + template <typename P> + static constexpr auto query(ASIO_MOVE_ARG(P) p) + noexcept( + noexcept( + conditional<true, T, P>::type::query(ASIO_MOVE_CAST(P)(p)) + ) + ) + -> decltype( + conditional<true, T, P>::type::query(ASIO_MOVE_CAST(P)(p)) + ) + { + return T::query(ASIO_MOVE_CAST(P)(p)); + } + }; +#else // defined(ASIO_HAS_DEDUCED_QUERY_STATIC_CONSTEXPR_MEMBER_TRAIT) + typedef T type; +#endif // defined(ASIO_HAS_DEDUCED_QUERY_STATIC_CONSTEXPR_MEMBER_TRAIT) + }; + + template <typename T> + struct query_member : + traits::query_member<typename proxy<T>::type, blocking_t> {}; + + template <typename T> + struct query_static_constexpr_member : + traits::query_static_constexpr_member< + typename static_proxy<T>::type, blocking_t> {}; + +#if defined(ASIO_HAS_DEDUCED_STATIC_QUERY_TRAIT) \ + && defined(ASIO_HAS_SFINAE_VARIABLE_TEMPLATES) + template <typename T> + static ASIO_CONSTEXPR + typename query_static_constexpr_member<T>::result_type + static_query() + ASIO_NOEXCEPT_IF(( + query_static_constexpr_member<T>::is_noexcept)) + { + return query_static_constexpr_member<T>::value(); + } + + template <typename T> + static ASIO_CONSTEXPR + typename traits::static_query<T, possibly_t>::result_type + static_query( + typename enable_if< + !query_static_constexpr_member<T>::is_valid + >::type* = 0, + typename enable_if< + !query_member<T>::is_valid + >::type* = 0, + typename enable_if< + traits::static_query<T, possibly_t>::is_valid + >::type* = 0) ASIO_NOEXCEPT + { + return traits::static_query<T, possibly_t>::value(); + } + + template <typename T> + static ASIO_CONSTEXPR + typename traits::static_query<T, always_t>::result_type + static_query( + typename enable_if< + !query_static_constexpr_member<T>::is_valid + >::type* = 0, + typename enable_if< + !query_member<T>::is_valid + >::type* = 0, + typename enable_if< + !traits::static_query<T, possibly_t>::is_valid + >::type* = 0, + typename enable_if< + traits::static_query<T, always_t>::is_valid + >::type* = 0) ASIO_NOEXCEPT + { + return traits::static_query<T, always_t>::value(); + } + + template <typename T> + static ASIO_CONSTEXPR + typename traits::static_query<T, never_t>::result_type + static_query( + typename enable_if< + !query_static_constexpr_member<T>::is_valid + >::type* = 0, + typename enable_if< + !query_member<T>::is_valid + >::type* = 0, + typename enable_if< + !traits::static_query<T, possibly_t>::is_valid + >::type* = 0, + typename enable_if< + !traits::static_query<T, always_t>::is_valid + >::type* = 0, + typename enable_if< + traits::static_query<T, never_t>::is_valid + >::type* = 0) ASIO_NOEXCEPT + { + return traits::static_query<T, never_t>::value(); + } + + template <typename E, typename T = decltype(blocking_t::static_query<E>())> + static ASIO_CONSTEXPR const T static_query_v + = blocking_t::static_query<E>(); +#endif // defined(ASIO_HAS_DEDUCED_STATIC_QUERY_TRAIT) + // && defined(ASIO_HAS_SFINAE_VARIABLE_TEMPLATES) + + friend ASIO_CONSTEXPR bool operator==( + const blocking_t& a, const blocking_t& b) + { + return a.value_ == b.value_; + } + + friend ASIO_CONSTEXPR bool operator!=( + const blocking_t& a, const blocking_t& b) + { + return a.value_ != b.value_; + } + + struct convertible_from_blocking_t + { + ASIO_CONSTEXPR convertible_from_blocking_t(blocking_t) {} + }; + + template <typename Executor> + friend ASIO_CONSTEXPR blocking_t query( + const Executor& ex, convertible_from_blocking_t, + typename enable_if< + can_query<const Executor&, possibly_t>::value + >::type* = 0) +#if !defined(__clang__) // Clang crashes if noexcept is used here. +#if defined(ASIO_MSVC) // Visual C++ wants the type to be qualified. + ASIO_NOEXCEPT_IF(( + is_nothrow_query<const Executor&, blocking_t<>::possibly_t>::value)) +#else // defined(ASIO_MSVC) + ASIO_NOEXCEPT_IF(( + is_nothrow_query<const Executor&, possibly_t>::value)) +#endif // defined(ASIO_MSVC) +#endif // !defined(__clang__) + { + return asio::query(ex, possibly_t()); + } + + template <typename Executor> + friend ASIO_CONSTEXPR blocking_t query( + const Executor& ex, convertible_from_blocking_t, + typename enable_if< + !can_query<const Executor&, possibly_t>::value + >::type* = 0, + typename enable_if< + can_query<const Executor&, always_t>::value + >::type* = 0) +#if !defined(__clang__) // Clang crashes if noexcept is used here. +#if defined(ASIO_MSVC) // Visual C++ wants the type to be qualified. + ASIO_NOEXCEPT_IF(( + is_nothrow_query<const Executor&, blocking_t<>::always_t>::value)) +#else // defined(ASIO_MSVC) + ASIO_NOEXCEPT_IF(( + is_nothrow_query<const Executor&, always_t>::value)) +#endif // defined(ASIO_MSVC) +#endif // !defined(__clang__) + { + return asio::query(ex, always_t()); + } + + template <typename Executor> + friend ASIO_CONSTEXPR blocking_t query( + const Executor& ex, convertible_from_blocking_t, + typename enable_if< + !can_query<const Executor&, possibly_t>::value + >::type* = 0, + typename enable_if< + !can_query<const Executor&, always_t>::value + >::type* = 0, + typename enable_if< + can_query<const Executor&, never_t>::value + >::type* = 0) +#if !defined(__clang__) // Clang crashes if noexcept is used here. +#if defined(ASIO_MSVC) // Visual C++ wants the type to be qualified. + ASIO_NOEXCEPT_IF(( + is_nothrow_query<const Executor&, blocking_t<>::never_t>::value)) +#else // defined(ASIO_MSVC) + ASIO_NOEXCEPT_IF(( + is_nothrow_query<const Executor&, never_t>::value)) +#endif // defined(ASIO_MSVC) +#endif // !defined(__clang__) + { + return asio::query(ex, never_t()); + } + + ASIO_STATIC_CONSTEXPR_DEFAULT_INIT(possibly_t, possibly); + ASIO_STATIC_CONSTEXPR_DEFAULT_INIT(always_t, always); + ASIO_STATIC_CONSTEXPR_DEFAULT_INIT(never_t, never); + +#if !defined(ASIO_HAS_CONSTEXPR) + static const blocking_t instance; +#endif // !defined(ASIO_HAS_CONSTEXPR) + +private: + int value_; +}; + +#if defined(ASIO_HAS_DEDUCED_STATIC_QUERY_TRAIT) \ + && defined(ASIO_HAS_SFINAE_VARIABLE_TEMPLATES) +template <int I> template <typename E, typename T> +const T blocking_t<I>::static_query_v; +#endif // defined(ASIO_HAS_DEDUCED_STATIC_QUERY_TRAIT) + // && defined(ASIO_HAS_SFINAE_VARIABLE_TEMPLATES) + +#if !defined(ASIO_HAS_CONSTEXPR) +template <int I> +const blocking_t<I> blocking_t<I>::instance; +#endif + +template <int I> +const typename blocking_t<I>::possibly_t blocking_t<I>::possibly; + +template <int I> +const typename blocking_t<I>::always_t blocking_t<I>::always; + +template <int I> +const typename blocking_t<I>::never_t blocking_t<I>::never; + +namespace blocking { + +template <int I = 0> +struct possibly_t +{ +#if defined(ASIO_HAS_VARIABLE_TEMPLATES) + template <typename T> + ASIO_STATIC_CONSTEXPR(bool, + is_applicable_property_v = ( + is_executor<T>::value + || conditional< + is_executor<T>::value, + false_type, + is_sender<T> + >::type::value + || conditional< + is_executor<T>::value, + false_type, + is_scheduler<T> + >::type::value)); +#endif // defined(ASIO_HAS_VARIABLE_TEMPLATES) + + ASIO_STATIC_CONSTEXPR(bool, is_requirable = true); + ASIO_STATIC_CONSTEXPR(bool, is_preferable = true); + typedef blocking_t<I> polymorphic_query_result_type; + + ASIO_CONSTEXPR possibly_t() + { + } + + template <typename T> + struct query_member : + traits::query_member< + typename blocking_t<I>::template proxy<T>::type, possibly_t> {}; + + template <typename T> + struct query_static_constexpr_member : + traits::query_static_constexpr_member< + typename blocking_t<I>::template static_proxy<T>::type, possibly_t> {}; + +#if defined(ASIO_HAS_DEDUCED_STATIC_QUERY_TRAIT) \ + && defined(ASIO_HAS_SFINAE_VARIABLE_TEMPLATES) + template <typename T> + static ASIO_CONSTEXPR + typename query_static_constexpr_member<T>::result_type + static_query() + ASIO_NOEXCEPT_IF(( + query_static_constexpr_member<T>::is_noexcept)) + { + return query_static_constexpr_member<T>::value(); + } + + template <typename T> + static ASIO_CONSTEXPR possibly_t static_query( + typename enable_if< + !query_static_constexpr_member<T>::is_valid + >::type* = 0, + typename enable_if< + !query_member<T>::is_valid + >::type* = 0, + typename enable_if< + !traits::query_free<T, possibly_t>::is_valid + >::type* = 0, + typename enable_if< + !can_query<T, always_t<I> >::value + >::type* = 0, + typename enable_if< + !can_query<T, never_t<I> >::value + >::type* = 0) ASIO_NOEXCEPT + { + return possibly_t(); + } + + template <typename E, typename T = decltype(possibly_t::static_query<E>())> + static ASIO_CONSTEXPR const T static_query_v + = possibly_t::static_query<E>(); +#endif // defined(ASIO_HAS_SFINAE_VARIABLE_TEMPLATES) + // && defined(ASIO_HAS_SFINAE_VARIABLE_TEMPLATES) + + static ASIO_CONSTEXPR blocking_t<I> value() + { + return possibly_t(); + } + + friend ASIO_CONSTEXPR bool operator==( + const possibly_t&, const possibly_t&) + { + return true; + } + + friend ASIO_CONSTEXPR bool operator!=( + const possibly_t&, const possibly_t&) + { + return false; + } + + friend ASIO_CONSTEXPR bool operator==( + const possibly_t&, const always_t<I>&) + { + return false; + } + + friend ASIO_CONSTEXPR bool operator!=( + const possibly_t&, const always_t<I>&) + { + return true; + } + + friend ASIO_CONSTEXPR bool operator==( + const possibly_t&, const never_t<I>&) + { + return false; + } + + friend ASIO_CONSTEXPR bool operator!=( + const possibly_t&, const never_t<I>&) + { + return true; + } +}; + +#if defined(ASIO_HAS_DEDUCED_STATIC_QUERY_TRAIT) \ + && defined(ASIO_HAS_SFINAE_VARIABLE_TEMPLATES) +template <int I> template <typename E, typename T> +const T possibly_t<I>::static_query_v; +#endif // defined(ASIO_HAS_DEDUCED_STATIC_QUERY_TRAIT) + // && defined(ASIO_HAS_SFINAE_VARIABLE_TEMPLATES) + +template <typename Executor> +class adapter +{ +public: + adapter(int, const Executor& e) ASIO_NOEXCEPT + : executor_(e) + { + } + + adapter(const adapter& other) ASIO_NOEXCEPT + : executor_(other.executor_) + { + } + +#if defined(ASIO_HAS_MOVE) + adapter(adapter&& other) ASIO_NOEXCEPT + : executor_(ASIO_MOVE_CAST(Executor)(other.executor_)) + { + } +#endif // defined(ASIO_HAS_MOVE) || defined(GENERATING_DOCUMENTATION) + + template <int I> + static ASIO_CONSTEXPR always_t<I> query( + blocking_t<I>) ASIO_NOEXCEPT + { + return always_t<I>(); + } + + template <int I> + static ASIO_CONSTEXPR always_t<I> query( + possibly_t<I>) ASIO_NOEXCEPT + { + return always_t<I>(); + } + + template <int I> + static ASIO_CONSTEXPR always_t<I> query( + always_t<I>) ASIO_NOEXCEPT + { + return always_t<I>(); + } + + template <int I> + static ASIO_CONSTEXPR always_t<I> query( + never_t<I>) ASIO_NOEXCEPT + { + return always_t<I>(); + } + + template <typename Property> + typename enable_if< + can_query<const Executor&, Property>::value, + typename query_result<const Executor&, Property>::type + >::type query(const Property& p) const + ASIO_NOEXCEPT_IF(( + is_nothrow_query<const Executor&, Property>::value)) + { + return asio::query(executor_, p); + } + + template <int I> + typename enable_if< + can_require<const Executor&, possibly_t<I> >::value, + typename require_result<const Executor&, possibly_t<I> >::type + >::type require(possibly_t<I>) const ASIO_NOEXCEPT + { + return asio::require(executor_, possibly_t<I>()); + } + + template <int I> + typename enable_if< + can_require<const Executor&, never_t<I> >::value, + typename require_result<const Executor&, never_t<I> >::type + >::type require(never_t<I>) const ASIO_NOEXCEPT + { + return asio::require(executor_, never_t<I>()); + } + + template <typename Property> + typename enable_if< + can_require<const Executor&, Property>::value, + adapter<typename decay< + typename require_result<const Executor&, Property>::type + >::type> + >::type require(const Property& p) const + ASIO_NOEXCEPT_IF(( + is_nothrow_require<const Executor&, Property>::value)) + { + return adapter<typename decay< + typename require_result<const Executor&, Property>::type + >::type>(0, asio::require(executor_, p)); + } + + template <typename Property> + typename enable_if< + can_prefer<const Executor&, Property>::value, + adapter<typename decay< + typename prefer_result<const Executor&, Property>::type + >::type> + >::type prefer(const Property& p) const + ASIO_NOEXCEPT_IF(( + is_nothrow_prefer<const Executor&, Property>::value)) + { + return adapter<typename decay< + typename prefer_result<const Executor&, Property>::type + >::type>(0, asio::prefer(executor_, p)); + } + + template <typename Function> + typename enable_if< + execution::can_execute<const Executor&, Function>::value + >::type execute(ASIO_MOVE_ARG(Function) f) const + { + blocking_adaptation::blocking_execute( + executor_, ASIO_MOVE_CAST(Function)(f)); + } + + friend bool operator==(const adapter& a, const adapter& b) ASIO_NOEXCEPT + { + return a.executor_ == b.executor_; + } + + friend bool operator!=(const adapter& a, const adapter& b) ASIO_NOEXCEPT + { + return a.executor_ != b.executor_; + } + +private: + Executor executor_; +}; + +template <int I = 0> +struct always_t +{ +#if defined(ASIO_HAS_VARIABLE_TEMPLATES) + template <typename T> + ASIO_STATIC_CONSTEXPR(bool, + is_applicable_property_v = ( + is_executor<T>::value + || conditional< + is_executor<T>::value, + false_type, + is_sender<T> + >::type::value + || conditional< + is_executor<T>::value, + false_type, + is_scheduler<T> + >::type::value)); +#endif // defined(ASIO_HAS_VARIABLE_TEMPLATES) + + ASIO_STATIC_CONSTEXPR(bool, is_requirable = true); + ASIO_STATIC_CONSTEXPR(bool, is_preferable = false); + typedef blocking_t<I> polymorphic_query_result_type; + + ASIO_CONSTEXPR always_t() + { + } + + template <typename T> + struct query_member : + traits::query_member< + typename blocking_t<I>::template proxy<T>::type, always_t> {}; + + template <typename T> + struct query_static_constexpr_member : + traits::query_static_constexpr_member< + typename blocking_t<I>::template static_proxy<T>::type, always_t> {}; + +#if defined(ASIO_HAS_DEDUCED_STATIC_QUERY_TRAIT) \ + && defined(ASIO_HAS_SFINAE_VARIABLE_TEMPLATES) + template <typename T> + static ASIO_CONSTEXPR + typename query_static_constexpr_member<T>::result_type + static_query() + ASIO_NOEXCEPT_IF(( + query_static_constexpr_member<T>::is_noexcept)) + { + return query_static_constexpr_member<T>::value(); + } + + template <typename E, typename T = decltype(always_t::static_query<E>())> + static ASIO_CONSTEXPR const T static_query_v + = always_t::static_query<E>(); +#endif // defined(ASIO_HAS_SFINAE_VARIABLE_TEMPLATES) + // && defined(ASIO_HAS_SFINAE_VARIABLE_TEMPLATES) + + static ASIO_CONSTEXPR blocking_t<I> value() + { + return always_t(); + } + + friend ASIO_CONSTEXPR bool operator==( + const always_t&, const always_t&) + { + return true; + } + + friend ASIO_CONSTEXPR bool operator!=( + const always_t&, const always_t&) + { + return false; + } + + friend ASIO_CONSTEXPR bool operator==( + const always_t&, const possibly_t<I>&) + { + return false; + } + + friend ASIO_CONSTEXPR bool operator!=( + const always_t&, const possibly_t<I>&) + { + return true; + } + + friend ASIO_CONSTEXPR bool operator==( + const always_t&, const never_t<I>&) + { + return false; + } + + friend ASIO_CONSTEXPR bool operator!=( + const always_t&, const never_t<I>&) + { + return true; + } + + template <typename Executor> + friend adapter<Executor> require( + const Executor& e, const always_t&, + typename enable_if< + is_executor<Executor>::value + >::type* = 0, + typename enable_if< + traits::static_require< + const Executor&, + blocking_adaptation::allowed_t<0> + >::is_valid + >::type* = 0) + { + return adapter<Executor>(0, e); + } +}; + +#if defined(ASIO_HAS_DEDUCED_STATIC_QUERY_TRAIT) \ + && defined(ASIO_HAS_SFINAE_VARIABLE_TEMPLATES) +template <int I> template <typename E, typename T> +const T always_t<I>::static_query_v; +#endif // defined(ASIO_HAS_DEDUCED_STATIC_QUERY_TRAIT) + // && defined(ASIO_HAS_SFINAE_VARIABLE_TEMPLATES) + +template <int I> +struct never_t +{ +#if defined(ASIO_HAS_VARIABLE_TEMPLATES) + template <typename T> + ASIO_STATIC_CONSTEXPR(bool, + is_applicable_property_v = ( + is_executor<T>::value + || conditional< + is_executor<T>::value, + false_type, + is_sender<T> + >::type::value + || conditional< + is_executor<T>::value, + false_type, + is_scheduler<T> + >::type::value)); +#endif // defined(ASIO_HAS_VARIABLE_TEMPLATES) + + ASIO_STATIC_CONSTEXPR(bool, is_requirable = true); + ASIO_STATIC_CONSTEXPR(bool, is_preferable = true); + typedef blocking_t<I> polymorphic_query_result_type; + + ASIO_CONSTEXPR never_t() + { + } + + template <typename T> + struct query_member : + traits::query_member< + typename blocking_t<I>::template proxy<T>::type, never_t> {}; + + template <typename T> + struct query_static_constexpr_member : + traits::query_static_constexpr_member< + typename blocking_t<I>::template static_proxy<T>::type, never_t> {}; + +#if defined(ASIO_HAS_DEDUCED_STATIC_QUERY_TRAIT) \ + && defined(ASIO_HAS_SFINAE_VARIABLE_TEMPLATES) + template <typename T> + static ASIO_CONSTEXPR + typename query_static_constexpr_member<T>::result_type + static_query() + ASIO_NOEXCEPT_IF(( + query_static_constexpr_member<T>::is_noexcept)) + { + return query_static_constexpr_member<T>::value(); + } + + template <typename E, typename T = decltype(never_t::static_query<E>())> + static ASIO_CONSTEXPR const T static_query_v + = never_t::static_query<E>(); +#endif // defined(ASIO_HAS_DEDUCED_STATIC_QUERY_TRAIT) + // && defined(ASIO_HAS_SFINAE_VARIABLE_TEMPLATES) + + static ASIO_CONSTEXPR blocking_t<I> value() + { + return never_t(); + } + + friend ASIO_CONSTEXPR bool operator==( + const never_t&, const never_t&) + { + return true; + } + + friend ASIO_CONSTEXPR bool operator!=( + const never_t&, const never_t&) + { + return false; + } + + friend ASIO_CONSTEXPR bool operator==( + const never_t&, const possibly_t<I>&) + { + return false; + } + + friend ASIO_CONSTEXPR bool operator!=( + const never_t&, const possibly_t<I>&) + { + return true; + } + + friend ASIO_CONSTEXPR bool operator==( + const never_t&, const always_t<I>&) + { + return false; + } + + friend ASIO_CONSTEXPR bool operator!=( + const never_t&, const always_t<I>&) + { + return true; + } +}; + +#if defined(ASIO_HAS_DEDUCED_STATIC_QUERY_TRAIT) \ + && defined(ASIO_HAS_SFINAE_VARIABLE_TEMPLATES) +template <int I> template <typename E, typename T> +const T never_t<I>::static_query_v; +#endif // defined(ASIO_HAS_SFINAE_VARIABLE_TEMPLATES) + +} // namespace blocking +} // namespace detail + +typedef detail::blocking_t<> blocking_t; + +#if defined(ASIO_HAS_CONSTEXPR) || defined(GENERATING_DOCUMENTATION) +constexpr blocking_t blocking; +#else // defined(ASIO_HAS_CONSTEXPR) || defined(GENERATING_DOCUMENTATION) +namespace { static const blocking_t& blocking = blocking_t::instance; } +#endif + +} // namespace execution + +#if !defined(ASIO_HAS_VARIABLE_TEMPLATES) + +template <typename T> +struct is_applicable_property<T, execution::blocking_t> + : integral_constant<bool, + execution::is_executor<T>::value + || conditional< + execution::is_executor<T>::value, + false_type, + execution::is_sender<T> + >::type::value + || conditional< + execution::is_executor<T>::value, + false_type, + execution::is_scheduler<T> + >::type::value> +{ +}; + +template <typename T> +struct is_applicable_property<T, execution::blocking_t::possibly_t> + : integral_constant<bool, + execution::is_executor<T>::value + || conditional< + execution::is_executor<T>::value, + false_type, + execution::is_sender<T> + >::type::value + || conditional< + execution::is_executor<T>::value, + false_type, + execution::is_scheduler<T> + >::type::value> +{ +}; + +template <typename T> +struct is_applicable_property<T, execution::blocking_t::always_t> + : integral_constant<bool, + execution::is_executor<T>::value + || conditional< + execution::is_executor<T>::value, + false_type, + execution::is_sender<T> + >::type::value + || conditional< + execution::is_executor<T>::value, + false_type, + execution::is_scheduler<T> + >::type::value> +{ +}; + +template <typename T> +struct is_applicable_property<T, execution::blocking_t::never_t> + : integral_constant<bool, + execution::is_executor<T>::value + || conditional< + execution::is_executor<T>::value, + false_type, + execution::is_sender<T> + >::type::value + || conditional< + execution::is_executor<T>::value, + false_type, + execution::is_scheduler<T> + >::type::value> +{ +}; + +#endif // !defined(ASIO_HAS_VARIABLE_TEMPLATES) + +namespace traits { + +#if !defined(ASIO_HAS_DEDUCED_QUERY_FREE_TRAIT) + +template <typename T> +struct query_free_default<T, execution::blocking_t, + typename enable_if< + can_query<T, execution::blocking_t::possibly_t>::value + >::type> +{ + ASIO_STATIC_CONSTEXPR(bool, is_valid = true); + ASIO_STATIC_CONSTEXPR(bool, is_noexcept = + (is_nothrow_query<T, execution::blocking_t::possibly_t>::value)); + + typedef execution::blocking_t result_type; +}; + +template <typename T> +struct query_free_default<T, execution::blocking_t, + typename enable_if< + !can_query<T, execution::blocking_t::possibly_t>::value + && can_query<T, execution::blocking_t::always_t>::value + >::type> +{ + ASIO_STATIC_CONSTEXPR(bool, is_valid = true); + ASIO_STATIC_CONSTEXPR(bool, is_noexcept = + (is_nothrow_query<T, execution::blocking_t::always_t>::value)); + + typedef execution::blocking_t result_type; +}; + +template <typename T> +struct query_free_default<T, execution::blocking_t, + typename enable_if< + !can_query<T, execution::blocking_t::possibly_t>::value + && !can_query<T, execution::blocking_t::always_t>::value + && can_query<T, execution::blocking_t::never_t>::value + >::type> +{ + ASIO_STATIC_CONSTEXPR(bool, is_valid = true); + ASIO_STATIC_CONSTEXPR(bool, is_noexcept = + (is_nothrow_query<T, execution::blocking_t::never_t>::value)); + + typedef execution::blocking_t result_type; +}; + +#endif // !defined(ASIO_HAS_DEDUCED_QUERY_FREE_TRAIT) + +#if !defined(ASIO_HAS_DEDUCED_STATIC_QUERY_TRAIT) \ + || !defined(ASIO_HAS_SFINAE_VARIABLE_TEMPLATES) + +template <typename T> +struct static_query<T, execution::blocking_t, + typename enable_if< + execution::detail::blocking_t<0>:: + query_static_constexpr_member<T>::is_valid + >::type> +{ + ASIO_STATIC_CONSTEXPR(bool, is_valid = true); + ASIO_STATIC_CONSTEXPR(bool, is_noexcept = true); + + typedef typename execution::detail::blocking_t<0>:: + query_static_constexpr_member<T>::result_type result_type; + + static ASIO_CONSTEXPR result_type value() + { + return execution::blocking_t::query_static_constexpr_member<T>::value(); + } +}; + +template <typename T> +struct static_query<T, execution::blocking_t, + typename enable_if< + !execution::detail::blocking_t<0>:: + query_static_constexpr_member<T>::is_valid + && !execution::detail::blocking_t<0>:: + query_member<T>::is_valid + && traits::static_query<T, execution::blocking_t::possibly_t>::is_valid + >::type> +{ + ASIO_STATIC_CONSTEXPR(bool, is_valid = true); + ASIO_STATIC_CONSTEXPR(bool, is_noexcept = true); + + typedef typename traits::static_query<T, + execution::blocking_t::possibly_t>::result_type result_type; + + static ASIO_CONSTEXPR result_type value() + { + return traits::static_query<T, execution::blocking_t::possibly_t>::value(); + } +}; + +template <typename T> +struct static_query<T, execution::blocking_t, + typename enable_if< + !execution::detail::blocking_t<0>:: + query_static_constexpr_member<T>::is_valid + && !execution::detail::blocking_t<0>:: + query_member<T>::is_valid + && !traits::static_query<T, execution::blocking_t::possibly_t>::is_valid + && traits::static_query<T, execution::blocking_t::always_t>::is_valid + >::type> +{ + ASIO_STATIC_CONSTEXPR(bool, is_valid = true); + ASIO_STATIC_CONSTEXPR(bool, is_noexcept = true); + + typedef typename traits::static_query<T, + execution::blocking_t::always_t>::result_type result_type; + + static ASIO_CONSTEXPR result_type value() + { + return traits::static_query<T, execution::blocking_t::always_t>::value(); + } +}; + +template <typename T> +struct static_query<T, execution::blocking_t, + typename enable_if< + !execution::detail::blocking_t<0>:: + query_static_constexpr_member<T>::is_valid + && !execution::detail::blocking_t<0>:: + query_member<T>::is_valid + && !traits::static_query<T, execution::blocking_t::possibly_t>::is_valid + && !traits::static_query<T, execution::blocking_t::always_t>::is_valid + && traits::static_query<T, execution::blocking_t::never_t>::is_valid + >::type> +{ + ASIO_STATIC_CONSTEXPR(bool, is_valid = true); + ASIO_STATIC_CONSTEXPR(bool, is_noexcept = true); + + typedef typename traits::static_query<T, + execution::blocking_t::never_t>::result_type result_type; + + static ASIO_CONSTEXPR result_type value() + { + return traits::static_query<T, execution::blocking_t::never_t>::value(); + } +}; + +template <typename T> +struct static_query<T, execution::blocking_t::possibly_t, + typename enable_if< + execution::detail::blocking::possibly_t<0>:: + query_static_constexpr_member<T>::is_valid + >::type> +{ + ASIO_STATIC_CONSTEXPR(bool, is_valid = true); + ASIO_STATIC_CONSTEXPR(bool, is_noexcept = true); + + typedef typename execution::detail::blocking::possibly_t<0>:: + query_static_constexpr_member<T>::result_type result_type; + + static ASIO_CONSTEXPR result_type value() + { + return execution::detail::blocking::possibly_t<0>:: + query_static_constexpr_member<T>::value(); + } +}; + +template <typename T> +struct static_query<T, execution::blocking_t::possibly_t, + typename enable_if< + !execution::detail::blocking::possibly_t<0>:: + query_static_constexpr_member<T>::is_valid + && !execution::detail::blocking::possibly_t<0>:: + query_member<T>::is_valid + && !traits::query_free<T, execution::blocking_t::possibly_t>::is_valid + && !can_query<T, execution::blocking_t::always_t>::value + && !can_query<T, execution::blocking_t::never_t>::value + >::type> +{ + ASIO_STATIC_CONSTEXPR(bool, is_valid = true); + ASIO_STATIC_CONSTEXPR(bool, is_noexcept = true); + + typedef execution::blocking_t::possibly_t result_type; + + static ASIO_CONSTEXPR result_type value() + { + return result_type(); + } +}; + +template <typename T> +struct static_query<T, execution::blocking_t::always_t, + typename enable_if< + execution::detail::blocking::always_t<0>:: + query_static_constexpr_member<T>::is_valid + >::type> +{ + ASIO_STATIC_CONSTEXPR(bool, is_valid = true); + ASIO_STATIC_CONSTEXPR(bool, is_noexcept = true); + + typedef typename execution::detail::blocking::always_t<0>:: + query_static_constexpr_member<T>::result_type result_type; + + static ASIO_CONSTEXPR result_type value() + { + return execution::detail::blocking::always_t<0>:: + query_static_constexpr_member<T>::value(); + } +}; + +template <typename T> +struct static_query<T, execution::blocking_t::never_t, + typename enable_if< + execution::detail::blocking::never_t<0>:: + query_static_constexpr_member<T>::is_valid + >::type> +{ + ASIO_STATIC_CONSTEXPR(bool, is_valid = true); + ASIO_STATIC_CONSTEXPR(bool, is_noexcept = true); + + typedef typename execution::detail::blocking::never_t<0>:: + query_static_constexpr_member<T>::result_type result_type; + + static ASIO_CONSTEXPR result_type value() + { + return execution::detail::blocking::never_t<0>:: + query_static_constexpr_member<T>::value(); + } +}; + +#endif // !defined(ASIO_HAS_DEDUCED_STATIC_QUERY_TRAIT) + // || !defined(ASIO_HAS_SFINAE_VARIABLE_TEMPLATES) + +#if !defined(ASIO_HAS_DEDUCED_STATIC_REQUIRE_TRAIT) + +template <typename T> +struct static_require<T, execution::blocking_t::possibly_t, + typename enable_if< + static_query<T, execution::blocking_t::possibly_t>::is_valid + >::type> +{ + ASIO_STATIC_CONSTEXPR(bool, is_valid = + (is_same<typename static_query<T, + execution::blocking_t::possibly_t>::result_type, + execution::blocking_t::possibly_t>::value)); +}; + +template <typename T> +struct static_require<T, execution::blocking_t::always_t, + typename enable_if< + static_query<T, execution::blocking_t::always_t>::is_valid + >::type> +{ + ASIO_STATIC_CONSTEXPR(bool, is_valid = + (is_same<typename static_query<T, + execution::blocking_t::always_t>::result_type, + execution::blocking_t::always_t>::value)); +}; + +template <typename T> +struct static_require<T, execution::blocking_t::never_t, + typename enable_if< + static_query<T, execution::blocking_t::never_t>::is_valid + >::type> +{ + ASIO_STATIC_CONSTEXPR(bool, is_valid = + (is_same<typename static_query<T, + execution::blocking_t::never_t>::result_type, + execution::blocking_t::never_t>::value)); +}; + +#endif // !defined(ASIO_HAS_DEDUCED_STATIC_REQUIRE_TRAIT) + +#if !defined(ASIO_HAS_DEDUCED_REQUIRE_FREE_TRAIT) + +template <typename T> +struct require_free_default<T, execution::blocking_t::always_t, + typename enable_if< + is_same<T, typename decay<T>::type>::value + && execution::is_executor<T>::value + && traits::static_require< + const T&, + execution::detail::blocking_adaptation::allowed_t<0> + >::is_valid + >::type> +{ + ASIO_STATIC_CONSTEXPR(bool, is_valid = true); + ASIO_STATIC_CONSTEXPR(bool, is_noexcept = false); + typedef execution::detail::blocking::adapter<T> result_type; +}; + +#endif // !defined(ASIO_HAS_DEDUCED_REQUIRE_FREE_TRAIT) + +#if !defined(ASIO_HAS_DEDUCED_EQUALITY_COMPARABLE_TRAIT) + +template <typename Executor> +struct equality_comparable< + execution::detail::blocking::adapter<Executor> > +{ + ASIO_STATIC_CONSTEXPR(bool, is_valid = true); + ASIO_STATIC_CONSTEXPR(bool, is_noexcept = true); +}; + +#endif // !defined(ASIO_HAS_DEDUCED_EQUALITY_COMPARABLE_TRAIT) + +#if !defined(ASIO_HAS_DEDUCED_EXECUTE_MEMBER_TRAIT) + +template <typename Executor, typename Function> +struct execute_member< + execution::detail::blocking::adapter<Executor>, Function> +{ + ASIO_STATIC_CONSTEXPR(bool, is_valid = true); + ASIO_STATIC_CONSTEXPR(bool, is_noexcept = false); + typedef void result_type; +}; + +#endif // !defined(ASIO_HAS_DEDUCED_EXECUTE_MEMBER_TRAIT) + +#if !defined(ASIO_HAS_DEDUCED_QUERY_STATIC_CONSTEXPR_MEMBER_TRAIT) + +template <typename Executor, int I> +struct query_static_constexpr_member< + execution::detail::blocking::adapter<Executor>, + execution::detail::blocking_t<I> > +{ + ASIO_STATIC_CONSTEXPR(bool, is_valid = true); + ASIO_STATIC_CONSTEXPR(bool, is_noexcept = true); + typedef execution::blocking_t::always_t result_type; + + static ASIO_CONSTEXPR result_type value() ASIO_NOEXCEPT + { + return result_type(); + } +}; + +template <typename Executor, int I> +struct query_static_constexpr_member< + execution::detail::blocking::adapter<Executor>, + execution::detail::blocking::always_t<I> > +{ + ASIO_STATIC_CONSTEXPR(bool, is_valid = true); + ASIO_STATIC_CONSTEXPR(bool, is_noexcept = true); + typedef execution::blocking_t::always_t result_type; + + static ASIO_CONSTEXPR result_type value() ASIO_NOEXCEPT + { + return result_type(); + } +}; + +template <typename Executor, int I> +struct query_static_constexpr_member< + execution::detail::blocking::adapter<Executor>, + execution::detail::blocking::possibly_t<I> > +{ + ASIO_STATIC_CONSTEXPR(bool, is_valid = true); + ASIO_STATIC_CONSTEXPR(bool, is_noexcept = true); + typedef execution::blocking_t::always_t result_type; + + static ASIO_CONSTEXPR result_type value() ASIO_NOEXCEPT + { + return result_type(); + } +}; + +template <typename Executor, int I> +struct query_static_constexpr_member< + execution::detail::blocking::adapter<Executor>, + execution::detail::blocking::never_t<I> > +{ + ASIO_STATIC_CONSTEXPR(bool, is_valid = true); + ASIO_STATIC_CONSTEXPR(bool, is_noexcept = true); + typedef execution::blocking_t::always_t result_type; + + static ASIO_CONSTEXPR result_type value() ASIO_NOEXCEPT + { + return result_type(); + } +}; + +#endif // !defined(ASIO_HAS_DEDUCED_QUERY_STATIC_CONSTEXPR_MEMBER_TRAIT) + +#if !defined(ASIO_HAS_DEDUCED_QUERY_MEMBER_TRAIT) + +template <typename Executor, typename Property> +struct query_member< + execution::detail::blocking::adapter<Executor>, Property, + typename enable_if< + can_query<const Executor&, Property>::value + >::type> +{ + ASIO_STATIC_CONSTEXPR(bool, is_valid = true); + ASIO_STATIC_CONSTEXPR(bool, is_noexcept = + (is_nothrow_query<Executor, Property>::value)); + typedef typename query_result<Executor, Property>::type result_type; +}; + +#endif // !defined(ASIO_HAS_DEDUCED_QUERY_MEMBER_TRAIT) + +#if !defined(ASIO_HAS_DEDUCED_REQUIRE_MEMBER_TRAIT) + +template <typename Executor, int I> +struct require_member< + execution::detail::blocking::adapter<Executor>, + execution::detail::blocking::possibly_t<I>, + typename enable_if< + can_require< + const Executor&, + execution::detail::blocking::possibly_t<I> + >::value + >::type> +{ + ASIO_STATIC_CONSTEXPR(bool, is_valid = true); + ASIO_STATIC_CONSTEXPR(bool, is_noexcept = + (is_nothrow_require<const Executor&, + execution::detail::blocking::possibly_t<I> >::value)); + typedef typename require_result<const Executor&, + execution::detail::blocking::possibly_t<I> >::type result_type; +}; + +template <typename Executor, int I> +struct require_member< + execution::detail::blocking::adapter<Executor>, + execution::detail::blocking::never_t<I>, + typename enable_if< + can_require< + const Executor&, + execution::detail::blocking::never_t<I> + >::value + >::type> +{ + ASIO_STATIC_CONSTEXPR(bool, is_valid = true); + ASIO_STATIC_CONSTEXPR(bool, is_noexcept = + (is_nothrow_require<const Executor&, + execution::detail::blocking::never_t<I> >::value)); + typedef typename require_result<const Executor&, + execution::detail::blocking::never_t<I> >::type result_type; +}; + +template <typename Executor, typename Property> +struct require_member< + execution::detail::blocking::adapter<Executor>, Property, + typename enable_if< + can_require<const Executor&, Property>::value + >::type> +{ + ASIO_STATIC_CONSTEXPR(bool, is_valid = true); + ASIO_STATIC_CONSTEXPR(bool, is_noexcept = + (is_nothrow_require<Executor, Property>::value)); + typedef execution::detail::blocking::adapter<typename decay< + typename require_result<Executor, Property>::type + >::type> result_type; +}; + +#endif // !defined(ASIO_HAS_DEDUCED_REQUIRE_MEMBER_TRAIT) + +#if !defined(ASIO_HAS_DEDUCED_PREFER_MEMBER_TRAIT) + +template <typename Executor, typename Property> +struct prefer_member< + execution::detail::blocking::adapter<Executor>, Property, + typename enable_if< + can_prefer<const Executor&, Property>::value + >::type> +{ + ASIO_STATIC_CONSTEXPR(bool, is_valid = true); + ASIO_STATIC_CONSTEXPR(bool, is_noexcept = + (is_nothrow_prefer<Executor, Property>::value)); + typedef execution::detail::blocking::adapter<typename decay< + typename prefer_result<Executor, Property>::type + >::type> result_type; +}; + +#endif // !defined(ASIO_HAS_DEDUCED_PREFER_MEMBER_TRAIT) + +} // namespace traits + +#endif // defined(GENERATING_DOCUMENTATION) + +} // namespace asio + +#include "asio/detail/pop_options.hpp" + +#endif // ASIO_EXECUTION_BLOCKING_HPP |