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+//
+// execution/blocking_adaptation.hpp
+// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2024 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_ADAPTATION_HPP
+#define ASIO_EXECUTION_BLOCKING_ADAPTATION_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/event.hpp"
+#include "asio/detail/mutex.hpp"
+#include "asio/detail/type_traits.hpp"
+#include "asio/execution/executor.hpp"
+#include "asio/is_applicable_property.hpp"
+#include "asio/prefer.hpp"
+#include "asio/query.hpp"
+#include "asio/require.hpp"
+#include "asio/traits/prefer_member.hpp"
+#include "asio/traits/query_free.hpp"
+#include "asio/traits/query_member.hpp"
+#include "asio/traits/query_static_constexpr_member.hpp"
+#include "asio/traits/require_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 whether automatic adaptation of an executor is
+/// allowed in order to apply the blocking_adaptation_t::allowed_t property.
+struct blocking_adaptation_t
+{
+ /// The blocking_adaptation_t property applies to executors.
+ template <typename T>
+ static constexpr bool is_applicable_property_v = is_executor_v<T>;
+
+ /// The top-level blocking_adaptation_t property cannot be required.
+ static constexpr bool is_requirable = false;
+
+ /// The top-level blocking_adaptation_t property cannot be preferred.
+ static constexpr bool is_preferable = false;
+
+ /// The type returned by queries against an @c any_executor.
+ typedef blocking_adaptation_t polymorphic_query_result_type;
+
+ /// A sub-property that indicates that automatic adaptation is not allowed.
+ struct disallowed_t
+ {
+ /// The blocking_adaptation_t::disallowed_t property applies to executors.
+ template <typename T>
+ static constexpr bool is_applicable_property_v = is_executor_v<T>;
+
+ /// The blocking_adaptation_t::disallowed_t property can be required.
+ static constexpr bool is_requirable = true;
+
+ /// The blocking_adaptation_t::disallowed_t property can be preferred.
+ static constexpr bool is_preferable = true;
+
+ /// The type returned by queries against an @c any_executor.
+ typedef blocking_adaptation_t polymorphic_query_result_type;
+
+ /// Default constructor.
+ constexpr disallowed_t();
+
+ /// Get the value associated with a property object.
+ /**
+ * @returns disallowed_t();
+ */
+ static constexpr blocking_adaptation_t value();
+ };
+
+ /// A sub-property that indicates that automatic adaptation is allowed.
+ struct allowed_t
+ {
+ /// The blocking_adaptation_t::allowed_t property applies to executors.
+ template <typename T>
+ static constexpr bool is_applicable_property_v = is_executor_v<T>;
+
+ /// The blocking_adaptation_t::allowed_t property can be required.
+ static constexpr bool is_requirable = true;
+
+ /// The blocking_adaptation_t::allowed_t property can be preferred.
+ static constexpr bool is_preferable = false;
+
+ /// The type returned by queries against an @c any_executor.
+ typedef blocking_adaptation_t polymorphic_query_result_type;
+
+ /// Default constructor.
+ constexpr allowed_t();
+
+ /// Get the value associated with a property object.
+ /**
+ * @returns allowed_t();
+ */
+ static constexpr blocking_adaptation_t value();
+ };
+
+ /// A special value used for accessing the blocking_adaptation_t::disallowed_t
+ /// property.
+ static constexpr disallowed_t disallowed;
+
+ /// A special value used for accessing the blocking_adaptation_t::allowed_t
+ /// property.
+ static constexpr allowed_t allowed;
+
+ /// Default constructor.
+ constexpr blocking_adaptation_t();
+
+ /// Construct from a sub-property value.
+ constexpr blocking_adaptation_t(disallowed_t);
+
+ /// Construct from a sub-property value.
+ constexpr blocking_adaptation_t(allowed_t);
+
+ /// Compare property values for equality.
+ friend constexpr bool operator==(
+ const blocking_adaptation_t& a, const blocking_adaptation_t& b) noexcept;
+
+ /// Compare property values for inequality.
+ friend constexpr bool operator!=(
+ const blocking_adaptation_t& a, const blocking_adaptation_t& b) noexcept;
+};
+
+/// A special value used for accessing the blocking_adaptation_t property.
+constexpr blocking_adaptation_t blocking_adaptation;
+
+} // namespace execution
+
+#else // defined(GENERATING_DOCUMENTATION)
+
+namespace execution {
+namespace detail {
+namespace blocking_adaptation {
+
+template <int I> struct disallowed_t;
+template <int I> struct allowed_t;
+
+} // namespace blocking_adaptation
+
+template <int I = 0>
+struct blocking_adaptation_t
+{
+#if defined(ASIO_HAS_VARIABLE_TEMPLATES)
+ template <typename T>
+ static constexpr bool is_applicable_property_v = is_executor<T>::value;
+#endif // defined(ASIO_HAS_VARIABLE_TEMPLATES)
+
+ static constexpr bool is_requirable = false;
+ static constexpr bool is_preferable = false;
+ typedef blocking_adaptation_t polymorphic_query_result_type;
+
+ typedef detail::blocking_adaptation::disallowed_t<I> disallowed_t;
+ typedef detail::blocking_adaptation::allowed_t<I> allowed_t;
+
+ constexpr blocking_adaptation_t()
+ : value_(-1)
+ {
+ }
+
+ constexpr blocking_adaptation_t(disallowed_t)
+ : value_(0)
+ {
+ }
+
+ constexpr blocking_adaptation_t(allowed_t)
+ : value_(1)
+ {
+ }
+
+ template <typename T>
+ struct proxy
+ {
+#if defined(ASIO_HAS_DEDUCED_QUERY_MEMBER_TRAIT)
+ struct type
+ {
+ template <typename P>
+ auto query(P&& p) const
+ noexcept(
+ noexcept(
+ declval<conditional_t<true, T, P>>().query(static_cast<P&&>(p))
+ )
+ )
+ -> decltype(
+ declval<conditional_t<true, T, P>>().query(static_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(P&& p)
+ noexcept(
+ noexcept(
+ conditional_t<true, T, P>::query(static_cast<P&&>(p))
+ )
+ )
+ -> decltype(
+ conditional_t<true, T, P>::query(static_cast<P&&>(p))
+ )
+ {
+ return T::query(static_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_adaptation_t> {};
+
+ template <typename T>
+ struct query_static_constexpr_member :
+ traits::query_static_constexpr_member<
+ typename static_proxy<T>::type, blocking_adaptation_t> {};
+
+#if defined(ASIO_HAS_DEDUCED_STATIC_QUERY_TRAIT) \
+ && defined(ASIO_HAS_SFINAE_VARIABLE_TEMPLATES)
+ template <typename T>
+ static constexpr typename query_static_constexpr_member<T>::result_type
+ static_query()
+ noexcept(query_static_constexpr_member<T>::is_noexcept)
+ {
+ return query_static_constexpr_member<T>::value();
+ }
+
+ template <typename T>
+ static constexpr
+ typename traits::static_query<T, disallowed_t>::result_type
+ static_query(
+ enable_if_t<
+ !query_static_constexpr_member<T>::is_valid
+ >* = 0,
+ enable_if_t<
+ !query_member<T>::is_valid
+ >* = 0,
+ enable_if_t<
+ traits::static_query<T, disallowed_t>::is_valid
+ >* = 0) noexcept
+ {
+ return traits::static_query<T, disallowed_t>::value();
+ }
+
+ template <typename T>
+ static constexpr
+ typename traits::static_query<T, allowed_t>::result_type
+ static_query(
+ enable_if_t<
+ !query_static_constexpr_member<T>::is_valid
+ >* = 0,
+ enable_if_t<
+ !query_member<T>::is_valid
+ >* = 0,
+ enable_if_t<
+ !traits::static_query<T, disallowed_t>::is_valid
+ >* = 0,
+ enable_if_t<
+ traits::static_query<T, allowed_t>::is_valid
+ >* = 0) noexcept
+ {
+ return traits::static_query<T, allowed_t>::value();
+ }
+
+ template <typename E,
+ typename T = decltype(blocking_adaptation_t::static_query<E>())>
+ static constexpr const T static_query_v
+ = blocking_adaptation_t::static_query<E>();
+#endif // defined(ASIO_HAS_DEDUCED_STATIC_QUERY_TRAIT)
+ // && defined(ASIO_HAS_SFINAE_VARIABLE_TEMPLATES)
+
+ friend constexpr bool operator==(
+ const blocking_adaptation_t& a, const blocking_adaptation_t& b)
+ {
+ return a.value_ == b.value_;
+ }
+
+ friend constexpr bool operator!=(
+ const blocking_adaptation_t& a, const blocking_adaptation_t& b)
+ {
+ return a.value_ != b.value_;
+ }
+
+ struct convertible_from_blocking_adaptation_t
+ {
+ constexpr convertible_from_blocking_adaptation_t(
+ blocking_adaptation_t)
+ {
+ }
+ };
+
+ template <typename Executor>
+ friend constexpr blocking_adaptation_t query(
+ const Executor& ex, convertible_from_blocking_adaptation_t,
+ enable_if_t<
+ can_query<const Executor&, disallowed_t>::value
+ >* = 0)
+#if !defined(__clang__) // Clang crashes if noexcept is used here.
+#if defined(ASIO_MSVC) // Visual C++ wants the type to be qualified.
+ noexcept(is_nothrow_query<const Executor&,
+ blocking_adaptation_t<>::disallowed_t>::value)
+#else // defined(ASIO_MSVC)
+ noexcept(is_nothrow_query<const Executor&, disallowed_t>::value)
+#endif // defined(ASIO_MSVC)
+#endif // !defined(__clang__)
+ {
+ return asio::query(ex, disallowed_t());
+ }
+
+ template <typename Executor>
+ friend constexpr blocking_adaptation_t query(
+ const Executor& ex, convertible_from_blocking_adaptation_t,
+ enable_if_t<
+ !can_query<const Executor&, disallowed_t>::value
+ >* = 0,
+ enable_if_t<
+ can_query<const Executor&, allowed_t>::value
+ >* = 0)
+#if !defined(__clang__) // Clang crashes if noexcept is used here.
+#if defined(ASIO_MSVC) // Visual C++ wants the type to be qualified.
+ noexcept(is_nothrow_query<const Executor&,
+ blocking_adaptation_t<>::allowed_t>::value)
+#else // defined(ASIO_MSVC)
+ noexcept(is_nothrow_query<const Executor&, allowed_t>::value)
+#endif // defined(ASIO_MSVC)
+#endif // !defined(__clang__)
+ {
+ return asio::query(ex, allowed_t());
+ }
+
+ ASIO_STATIC_CONSTEXPR_DEFAULT_INIT(disallowed_t, disallowed);
+ ASIO_STATIC_CONSTEXPR_DEFAULT_INIT(allowed_t, allowed);
+
+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_adaptation_t<I>::static_query_v;
+#endif // defined(ASIO_HAS_DEDUCED_STATIC_QUERY_TRAIT)
+ // && defined(ASIO_HAS_SFINAE_VARIABLE_TEMPLATES)
+
+template <int I>
+const typename blocking_adaptation_t<I>::disallowed_t
+blocking_adaptation_t<I>::disallowed;
+
+template <int I>
+const typename blocking_adaptation_t<I>::allowed_t
+blocking_adaptation_t<I>::allowed;
+
+namespace blocking_adaptation {
+
+template <int I = 0>
+struct disallowed_t
+{
+#if defined(ASIO_HAS_VARIABLE_TEMPLATES)
+ template <typename T>
+ static constexpr bool is_applicable_property_v = is_executor<T>::value;
+#endif // defined(ASIO_HAS_VARIABLE_TEMPLATES)
+
+ static constexpr bool is_requirable = true;
+ static constexpr bool is_preferable = true;
+ typedef blocking_adaptation_t<I> polymorphic_query_result_type;
+
+ constexpr disallowed_t()
+ {
+ }
+
+ template <typename T>
+ struct query_member :
+ traits::query_member<
+ typename blocking_adaptation_t<I>::template proxy<T>::type,
+ disallowed_t> {};
+
+ template <typename T>
+ struct query_static_constexpr_member :
+ traits::query_static_constexpr_member<
+ typename blocking_adaptation_t<I>::template static_proxy<T>::type,
+ disallowed_t> {};
+
+#if defined(ASIO_HAS_DEDUCED_STATIC_QUERY_TRAIT) \
+ && defined(ASIO_HAS_SFINAE_VARIABLE_TEMPLATES)
+ template <typename T>
+ static constexpr
+ typename query_static_constexpr_member<T>::result_type
+ static_query()
+ noexcept(query_static_constexpr_member<T>::is_noexcept)
+ {
+ return query_static_constexpr_member<T>::value();
+ }
+
+ template <typename T>
+ static constexpr disallowed_t static_query(
+ enable_if_t<
+ !query_static_constexpr_member<T>::is_valid
+ >* = 0,
+ enable_if_t<
+ !query_member<T>::is_valid
+ >* = 0,
+ enable_if_t<
+ !traits::query_free<T, disallowed_t>::is_valid
+ >* = 0,
+ enable_if_t<
+ !can_query<T, allowed_t<I>>::value
+ >* = 0) noexcept
+ {
+ return disallowed_t();
+ }
+
+ template <typename E, typename T = decltype(disallowed_t::static_query<E>())>
+ static constexpr const T static_query_v
+ = disallowed_t::static_query<E>();
+#endif // defined(ASIO_HAS_DEDUCED_STATIC_QUERY_TRAIT)
+ // && defined(ASIO_HAS_SFINAE_VARIABLE_TEMPLATES)
+
+ static constexpr blocking_adaptation_t<I> value()
+ {
+ return disallowed_t();
+ }
+
+ friend constexpr bool operator==(const disallowed_t&, const disallowed_t&)
+ {
+ return true;
+ }
+
+ friend constexpr bool operator!=(const disallowed_t&, const disallowed_t&)
+ {
+ return false;
+ }
+
+ friend constexpr bool operator==(const disallowed_t&, const allowed_t<I>&)
+ {
+ return false;
+ }
+
+ friend constexpr bool operator!=(const disallowed_t&, const allowed_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 disallowed_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) noexcept
+ : executor_(e)
+ {
+ }
+
+ adapter(const adapter& other) noexcept
+ : executor_(other.executor_)
+ {
+ }
+
+ adapter(adapter&& other) noexcept
+ : executor_(static_cast<Executor&&>(other.executor_))
+ {
+ }
+
+ template <int I>
+ static constexpr allowed_t<I> query(blocking_adaptation_t<I>) noexcept
+ {
+ return allowed_t<I>();
+ }
+
+ template <int I>
+ static constexpr allowed_t<I> query(allowed_t<I>) noexcept
+ {
+ return allowed_t<I>();
+ }
+
+ template <int I>
+ static constexpr allowed_t<I> query(disallowed_t<I>) noexcept
+ {
+ return allowed_t<I>();
+ }
+
+ template <typename Property>
+ enable_if_t<
+ can_query<const Executor&, Property>::value,
+ query_result_t<const Executor&, Property>
+ > query(const Property& p) const
+ noexcept(is_nothrow_query<const Executor&, Property>::value)
+ {
+ return asio::query(executor_, p);
+ }
+
+ template <int I>
+ Executor require(disallowed_t<I>) const noexcept
+ {
+ return executor_;
+ }
+
+ template <typename Property>
+ enable_if_t<
+ can_require<const Executor&, Property>::value,
+ adapter<decay_t<require_result_t<const Executor&, Property>>>
+ > require(const Property& p) const
+ noexcept(is_nothrow_require<const Executor&, Property>::value)
+ {
+ return adapter<decay_t<require_result_t<const Executor&, Property>>>(
+ 0, asio::require(executor_, p));
+ }
+
+ template <typename Property>
+ enable_if_t<
+ can_prefer<const Executor&, Property>::value,
+ adapter<decay_t<prefer_result_t<const Executor&, Property>>>
+ > prefer(const Property& p) const
+ noexcept(is_nothrow_prefer<const Executor&, Property>::value)
+ {
+ return adapter<decay_t<prefer_result_t<const Executor&, Property>>>(
+ 0, asio::prefer(executor_, p));
+ }
+
+ template <typename Function>
+ enable_if_t<
+ traits::execute_member<const Executor&, Function>::is_valid
+ > execute(Function&& f) const
+ {
+ executor_.execute(static_cast<Function&&>(f));
+ }
+
+ friend bool operator==(const adapter& a, const adapter& b) noexcept
+ {
+ return a.executor_ == b.executor_;
+ }
+
+ friend bool operator!=(const adapter& a, const adapter& b) noexcept
+ {
+ return a.executor_ != b.executor_;
+ }
+
+private:
+ Executor executor_;
+};
+
+template <int I = 0>
+struct allowed_t
+{
+#if defined(ASIO_HAS_VARIABLE_TEMPLATES)
+ template <typename T>
+ static constexpr bool is_applicable_property_v = is_executor<T>::value;
+#endif // defined(ASIO_HAS_VARIABLE_TEMPLATES)
+
+ static constexpr bool is_requirable = true;
+ static constexpr bool is_preferable = false;
+ typedef blocking_adaptation_t<I> polymorphic_query_result_type;
+
+ constexpr allowed_t()
+ {
+ }
+
+ template <typename T>
+ struct query_member :
+ traits::query_member<
+ typename blocking_adaptation_t<I>::template proxy<T>::type,
+ allowed_t> {};
+
+ template <typename T>
+ struct query_static_constexpr_member :
+ traits::query_static_constexpr_member<
+ typename blocking_adaptation_t<I>::template static_proxy<T>::type,
+ allowed_t> {};
+
+#if defined(ASIO_HAS_DEDUCED_STATIC_QUERY_TRAIT) \
+ && defined(ASIO_HAS_SFINAE_VARIABLE_TEMPLATES)
+ template <typename T>
+ static constexpr typename query_static_constexpr_member<T>::result_type
+ static_query()
+ noexcept(query_static_constexpr_member<T>::is_noexcept)
+ {
+ return query_static_constexpr_member<T>::value();
+ }
+
+ template <typename E, typename T = decltype(allowed_t::static_query<E>())>
+ static constexpr const T static_query_v = allowed_t::static_query<E>();
+#endif // defined(ASIO_HAS_DEDUCED_STATIC_QUERY_TRAIT)
+ // && defined(ASIO_HAS_SFINAE_VARIABLE_TEMPLATES)
+
+ static constexpr blocking_adaptation_t<I> value()
+ {
+ return allowed_t();
+ }
+
+ friend constexpr bool operator==(const allowed_t&, const allowed_t&)
+ {
+ return true;
+ }
+
+ friend constexpr bool operator!=(const allowed_t&, const allowed_t&)
+ {
+ return false;
+ }
+
+ friend constexpr bool operator==(const allowed_t&, const disallowed_t<I>&)
+ {
+ return false;
+ }
+
+ friend constexpr bool operator!=(const allowed_t&, const disallowed_t<I>&)
+ {
+ return true;
+ }
+
+ template <typename Executor>
+ friend adapter<Executor> require(
+ const Executor& e, const allowed_t&,
+ enable_if_t<
+ is_executor<Executor>::value
+ >* = 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 allowed_t<I>::static_query_v;
+#endif // defined(ASIO_HAS_DEDUCED_STATIC_QUERY_TRAIT)
+ // && defined(ASIO_HAS_SFINAE_VARIABLE_TEMPLATES)
+
+template <typename Function>
+class blocking_execute_state
+{
+public:
+ template <typename F>
+ blocking_execute_state(F&& f)
+ : func_(static_cast<F&&>(f)),
+ is_complete_(false)
+ {
+ }
+
+ template <typename Executor>
+ void execute_and_wait(Executor&& ex)
+ {
+ handler h = { this };
+ ex.execute(h);
+ asio::detail::mutex::scoped_lock lock(mutex_);
+ while (!is_complete_)
+ event_.wait(lock);
+ }
+
+ struct cleanup
+ {
+ ~cleanup()
+ {
+ asio::detail::mutex::scoped_lock lock(state_->mutex_);
+ state_->is_complete_ = true;
+ state_->event_.unlock_and_signal_one_for_destruction(lock);
+ }
+
+ blocking_execute_state* state_;
+ };
+
+ struct handler
+ {
+ void operator()()
+ {
+ cleanup c = { state_ };
+ state_->func_();
+ }
+
+ blocking_execute_state* state_;
+ };
+
+ Function func_;
+ asio::detail::mutex mutex_;
+ asio::detail::event event_;
+ bool is_complete_;
+};
+
+template <typename Executor, typename Function>
+void blocking_execute(
+ Executor&& ex,
+ Function&& func)
+{
+ typedef decay_t<Function> func_t;
+ blocking_execute_state<func_t> state(static_cast<Function&&>(func));
+ state.execute_and_wait(ex);
+}
+
+} // namespace blocking_adaptation
+} // namespace detail
+
+typedef detail::blocking_adaptation_t<> blocking_adaptation_t;
+
+constexpr blocking_adaptation_t blocking_adaptation;
+
+} // namespace execution
+
+#if !defined(ASIO_HAS_VARIABLE_TEMPLATES)
+
+template <typename T>
+struct is_applicable_property<T, execution::blocking_adaptation_t>
+ : integral_constant<bool, execution::is_executor<T>::value>
+{
+};
+
+template <typename T>
+struct is_applicable_property<T, execution::blocking_adaptation_t::disallowed_t>
+ : integral_constant<bool, execution::is_executor<T>::value>
+{
+};
+
+template <typename T>
+struct is_applicable_property<T, execution::blocking_adaptation_t::allowed_t>
+ : integral_constant<bool, execution::is_executor<T>::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_adaptation_t,
+ enable_if_t<
+ can_query<T, execution::blocking_adaptation_t::disallowed_t>::value
+ >>
+{
+ static constexpr bool is_valid = true;
+ static constexpr bool is_noexcept =
+ is_nothrow_query<T, execution::blocking_adaptation_t::disallowed_t>::value;
+
+ typedef execution::blocking_adaptation_t result_type;
+};
+
+template <typename T>
+struct query_free_default<T, execution::blocking_adaptation_t,
+ enable_if_t<
+ !can_query<T, execution::blocking_adaptation_t::disallowed_t>::value
+ && can_query<T, execution::blocking_adaptation_t::allowed_t>::value
+ >>
+{
+ static constexpr bool is_valid = true;
+ static constexpr bool is_noexcept =
+ is_nothrow_query<T, execution::blocking_adaptation_t::allowed_t>::value;
+
+ typedef execution::blocking_adaptation_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_adaptation_t,
+ enable_if_t<
+ execution::detail::blocking_adaptation_t<0>::
+ query_static_constexpr_member<T>::is_valid
+ >>
+{
+ static constexpr bool is_valid = true;
+ static constexpr bool is_noexcept = true;
+
+ typedef typename execution::detail::blocking_adaptation_t<0>::
+ query_static_constexpr_member<T>::result_type result_type;
+
+ static constexpr result_type value()
+ {
+ return execution::detail::blocking_adaptation_t<0>::
+ query_static_constexpr_member<T>::value();
+ }
+};
+
+template <typename T>
+struct static_query<T, execution::blocking_adaptation_t,
+ enable_if_t<
+ !execution::detail::blocking_adaptation_t<0>::
+ query_static_constexpr_member<T>::is_valid
+ && !execution::detail::blocking_adaptation_t<0>::
+ query_member<T>::is_valid
+ && traits::static_query<T,
+ execution::blocking_adaptation_t::disallowed_t>::is_valid
+ >>
+{
+ static constexpr bool is_valid = true;
+ static constexpr bool is_noexcept = true;
+
+ typedef typename traits::static_query<T,
+ execution::blocking_adaptation_t::disallowed_t>::result_type result_type;
+
+ static constexpr result_type value()
+ {
+ return traits::static_query<T,
+ execution::blocking_adaptation_t::disallowed_t>::value();
+ }
+};
+
+template <typename T>
+struct static_query<T, execution::blocking_adaptation_t,
+ enable_if_t<
+ !execution::detail::blocking_adaptation_t<0>::
+ query_static_constexpr_member<T>::is_valid
+ && !execution::detail::blocking_adaptation_t<0>::
+ query_member<T>::is_valid
+ && !traits::static_query<T,
+ execution::blocking_adaptation_t::disallowed_t>::is_valid
+ && traits::static_query<T,
+ execution::blocking_adaptation_t::allowed_t>::is_valid
+ >>
+{
+ static constexpr bool is_valid = true;
+ static constexpr bool is_noexcept = true;
+
+ typedef typename traits::static_query<T,
+ execution::blocking_adaptation_t::allowed_t>::result_type result_type;
+
+ static constexpr result_type value()
+ {
+ return traits::static_query<T,
+ execution::blocking_adaptation_t::allowed_t>::value();
+ }
+};
+
+template <typename T>
+struct static_query<T, execution::blocking_adaptation_t::disallowed_t,
+ enable_if_t<
+ execution::detail::blocking_adaptation::disallowed_t<0>::
+ query_static_constexpr_member<T>::is_valid
+ >>
+{
+ static constexpr bool is_valid = true;
+ static constexpr bool is_noexcept = true;
+
+ typedef typename execution::detail::blocking_adaptation::disallowed_t<0>::
+ query_static_constexpr_member<T>::result_type result_type;
+
+ static constexpr result_type value()
+ {
+ return execution::detail::blocking_adaptation::disallowed_t<0>::
+ query_static_constexpr_member<T>::value();
+ }
+};
+
+template <typename T>
+struct static_query<T, execution::blocking_adaptation_t::disallowed_t,
+ enable_if_t<
+ !execution::detail::blocking_adaptation::disallowed_t<0>::
+ query_static_constexpr_member<T>::is_valid
+ && !execution::detail::blocking_adaptation::disallowed_t<0>::
+ query_member<T>::is_valid
+ && !traits::query_free<T,
+ execution::blocking_adaptation_t::disallowed_t>::is_valid
+ && !can_query<T, execution::blocking_adaptation_t::allowed_t>::value
+ >>
+{
+ static constexpr bool is_valid = true;
+ static constexpr bool is_noexcept = true;
+
+ typedef execution::blocking_adaptation_t::disallowed_t result_type;
+
+ static constexpr result_type value()
+ {
+ return result_type();
+ }
+};
+
+template <typename T>
+struct static_query<T, execution::blocking_adaptation_t::allowed_t,
+ enable_if_t<
+ execution::detail::blocking_adaptation::allowed_t<0>::
+ query_static_constexpr_member<T>::is_valid
+ >>
+{
+ static constexpr bool is_valid = true;
+ static constexpr bool is_noexcept = true;
+
+ typedef typename execution::detail::blocking_adaptation::allowed_t<0>::
+ query_static_constexpr_member<T>::result_type result_type;
+
+ static constexpr result_type value()
+ {
+ return execution::detail::blocking_adaptation::allowed_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_REQUIRE_FREE_TRAIT)
+
+template <typename T>
+struct require_free_default<T, execution::blocking_adaptation_t::allowed_t,
+ enable_if_t<
+ is_same<T, decay_t<T>>::value
+ && execution::is_executor<T>::value
+ >>
+{
+ static constexpr bool is_valid = true;
+ static constexpr bool is_noexcept = false;
+ typedef execution::detail::blocking_adaptation::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_adaptation::adapter<Executor>>
+{
+ static constexpr bool is_valid = true;
+ 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_adaptation::adapter<Executor>, Function>
+{
+ static constexpr bool is_valid = true;
+ 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_adaptation::adapter<Executor>,
+ execution::detail::blocking_adaptation_t<I>>
+{
+ static constexpr bool is_valid = true;
+ static constexpr bool is_noexcept = true;
+ typedef execution::blocking_adaptation_t::allowed_t result_type;
+
+ static constexpr result_type value() noexcept
+ {
+ return result_type();
+ }
+};
+
+template <typename Executor, int I>
+struct query_static_constexpr_member<
+ execution::detail::blocking_adaptation::adapter<Executor>,
+ execution::detail::blocking_adaptation::allowed_t<I>>
+{
+ static constexpr bool is_valid = true;
+ static constexpr bool is_noexcept = true;
+ typedef execution::blocking_adaptation_t::allowed_t result_type;
+
+ static constexpr result_type value() noexcept
+ {
+ return result_type();
+ }
+};
+
+template <typename Executor, int I>
+struct query_static_constexpr_member<
+ execution::detail::blocking_adaptation::adapter<Executor>,
+ execution::detail::blocking_adaptation::disallowed_t<I>>
+{
+ static constexpr bool is_valid = true;
+ static constexpr bool is_noexcept = true;
+ typedef execution::blocking_adaptation_t::allowed_t result_type;
+
+ static constexpr result_type value() 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_adaptation::adapter<Executor>, Property,
+ enable_if_t<
+ can_query<const Executor&, Property>::value
+ >>
+{
+ static constexpr bool is_valid = true;
+ static constexpr bool is_noexcept =
+ is_nothrow_query<Executor, Property>::value;
+ typedef query_result_t<Executor, Property> 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_adaptation::adapter<Executor>,
+ execution::detail::blocking_adaptation::disallowed_t<I>>
+{
+ static constexpr bool is_valid = true;
+ static constexpr bool is_noexcept = true;
+ typedef Executor result_type;
+};
+
+template <typename Executor, typename Property>
+struct require_member<
+ execution::detail::blocking_adaptation::adapter<Executor>, Property,
+ enable_if_t<
+ can_require<const Executor&, Property>::value
+ >>
+{
+ static constexpr bool is_valid = true;
+ static constexpr bool is_noexcept =
+ is_nothrow_require<Executor, Property>::value;
+ typedef execution::detail::blocking_adaptation::adapter<
+ decay_t<require_result_t<Executor, Property>>> 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_adaptation::adapter<Executor>, Property,
+ enable_if_t<
+ can_prefer<const Executor&, Property>::value
+ >>
+{
+ static constexpr bool is_valid = true;
+ static constexpr bool is_noexcept =
+ is_nothrow_prefer<Executor, Property>::value;
+ typedef execution::detail::blocking_adaptation::adapter<
+ decay_t<prefer_result_t<Executor, Property>>> 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_ADAPTATION_HPP