1258 lines
36 KiB
C++
1258 lines
36 KiB
C++
//
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// execution/blocking_adaptation.hpp
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// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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//
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// Copyright (c) 2003-2023 Christopher M. Kohlhoff (chris at kohlhoff dot com)
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//
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// Distributed under the Boost Software License, Version 1.0. (See accompanying
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// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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//
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#ifndef ASIO_EXECUTION_BLOCKING_ADAPTATION_HPP
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#define ASIO_EXECUTION_BLOCKING_ADAPTATION_HPP
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#if defined(_MSC_VER) && (_MSC_VER >= 1200)
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# pragma once
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#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
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#include "asio/detail/config.hpp"
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#include "asio/detail/event.hpp"
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#include "asio/detail/mutex.hpp"
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#include "asio/detail/type_traits.hpp"
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#include "asio/execution/execute.hpp"
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#include "asio/execution/executor.hpp"
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#include "asio/execution/scheduler.hpp"
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#include "asio/execution/sender.hpp"
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#include "asio/is_applicable_property.hpp"
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#include "asio/prefer.hpp"
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#include "asio/query.hpp"
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#include "asio/require.hpp"
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#include "asio/traits/prefer_member.hpp"
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#include "asio/traits/query_free.hpp"
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#include "asio/traits/query_member.hpp"
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#include "asio/traits/query_static_constexpr_member.hpp"
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#include "asio/traits/require_member.hpp"
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#include "asio/traits/static_query.hpp"
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#include "asio/traits/static_require.hpp"
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#include "asio/detail/push_options.hpp"
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namespace asio {
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#if defined(GENERATING_DOCUMENTATION)
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namespace execution {
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/// A property to describe whether automatic adaptation of an executor is
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/// allowed in order to apply the blocking_adaptation_t::allowed_t property.
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struct blocking_adaptation_t
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{
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/// The blocking_adaptation_t property applies to executors, senders, and
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/// schedulers.
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template <typename T>
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static constexpr bool is_applicable_property_v =
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is_executor_v<T> || is_sender_v<T> || is_scheduler_v<T>;
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/// The top-level blocking_adaptation_t property cannot be required.
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static constexpr bool is_requirable = false;
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/// The top-level blocking_adaptation_t property cannot be preferred.
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static constexpr bool is_preferable = false;
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/// The type returned by queries against an @c any_executor.
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typedef blocking_adaptation_t polymorphic_query_result_type;
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/// A sub-property that indicates that automatic adaptation is not allowed.
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struct disallowed_t
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{
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/// The blocking_adaptation_t::disallowed_t property applies to executors,
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/// senders, and schedulers.
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template <typename T>
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static constexpr bool is_applicable_property_v =
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is_executor_v<T> || is_sender_v<T> || is_scheduler_v<T>;
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/// The blocking_adaptation_t::disallowed_t property can be required.
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static constexpr bool is_requirable = true;
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/// The blocking_adaptation_t::disallowed_t property can be preferred.
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static constexpr bool is_preferable = true;
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/// The type returned by queries against an @c any_executor.
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typedef blocking_adaptation_t polymorphic_query_result_type;
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/// Default constructor.
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constexpr disallowed_t();
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/// Get the value associated with a property object.
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/**
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* @returns disallowed_t();
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*/
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static constexpr blocking_adaptation_t value();
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};
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/// A sub-property that indicates that automatic adaptation is allowed.
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struct allowed_t
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{
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/// The blocking_adaptation_t::allowed_t property applies to executors,
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/// senders, and schedulers.
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template <typename T>
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static constexpr bool is_applicable_property_v =
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is_executor_v<T> || is_sender_v<T> || is_scheduler_v<T>;
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/// The blocking_adaptation_t::allowed_t property can be required.
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static constexpr bool is_requirable = true;
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/// The blocking_adaptation_t::allowed_t property can be preferred.
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static constexpr bool is_preferable = false;
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/// The type returned by queries against an @c any_executor.
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typedef blocking_adaptation_t polymorphic_query_result_type;
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/// Default constructor.
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constexpr allowed_t();
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/// Get the value associated with a property object.
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/**
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* @returns allowed_t();
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*/
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static constexpr blocking_adaptation_t value();
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};
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/// A special value used for accessing the blocking_adaptation_t::disallowed_t
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/// property.
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static constexpr disallowed_t disallowed;
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/// A special value used for accessing the blocking_adaptation_t::allowed_t
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/// property.
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static constexpr allowed_t allowed;
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/// Default constructor.
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constexpr blocking_adaptation_t();
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/// Construct from a sub-property value.
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constexpr blocking_adaptation_t(disallowed_t);
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/// Construct from a sub-property value.
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constexpr blocking_adaptation_t(allowed_t);
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/// Compare property values for equality.
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friend constexpr bool operator==(
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const blocking_adaptation_t& a, const blocking_adaptation_t& b) noexcept;
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/// Compare property values for inequality.
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friend constexpr bool operator!=(
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const blocking_adaptation_t& a, const blocking_adaptation_t& b) noexcept;
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};
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/// A special value used for accessing the blocking_adaptation_t property.
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constexpr blocking_adaptation_t blocking_adaptation;
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} // namespace execution
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#else // defined(GENERATING_DOCUMENTATION)
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namespace execution {
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namespace detail {
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namespace blocking_adaptation {
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template <int I> struct disallowed_t;
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template <int I> struct allowed_t;
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} // namespace blocking_adaptation
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template <int I = 0>
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struct blocking_adaptation_t
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{
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#if defined(ASIO_HAS_VARIABLE_TEMPLATES)
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# if defined(ASIO_NO_DEPRECATED)
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template <typename T>
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ASIO_STATIC_CONSTEXPR(bool,
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is_applicable_property_v = (
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is_executor<T>::value));
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# else // defined(ASIO_NO_DEPRECATED)
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template <typename T>
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ASIO_STATIC_CONSTEXPR(bool,
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is_applicable_property_v = (
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is_executor<T>::value
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|| conditional<
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is_executor<T>::value,
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false_type,
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is_sender<T>
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>::type::value
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|| conditional<
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is_executor<T>::value,
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false_type,
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is_scheduler<T>
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>::type::value
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));
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# endif // defined(ASIO_NO_DEPRECATED)
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#endif // defined(ASIO_HAS_VARIABLE_TEMPLATES)
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ASIO_STATIC_CONSTEXPR(bool, is_requirable = false);
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ASIO_STATIC_CONSTEXPR(bool, is_preferable = false);
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typedef blocking_adaptation_t polymorphic_query_result_type;
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typedef detail::blocking_adaptation::disallowed_t<I> disallowed_t;
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typedef detail::blocking_adaptation::allowed_t<I> allowed_t;
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ASIO_CONSTEXPR blocking_adaptation_t()
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: value_(-1)
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{
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}
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ASIO_CONSTEXPR blocking_adaptation_t(disallowed_t)
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: value_(0)
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{
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}
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ASIO_CONSTEXPR blocking_adaptation_t(allowed_t)
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: value_(1)
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{
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}
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template <typename T>
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struct proxy
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{
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#if defined(ASIO_HAS_DEDUCED_QUERY_MEMBER_TRAIT)
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struct type
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{
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template <typename P>
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auto query(ASIO_MOVE_ARG(P) p) const
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noexcept(
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noexcept(
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declval<typename conditional<true, T, P>::type>().query(
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ASIO_MOVE_CAST(P)(p))
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)
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)
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-> decltype(
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declval<typename conditional<true, T, P>::type>().query(
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ASIO_MOVE_CAST(P)(p))
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);
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};
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#else // defined(ASIO_HAS_DEDUCED_QUERY_MEMBER_TRAIT)
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typedef T type;
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#endif // defined(ASIO_HAS_DEDUCED_QUERY_MEMBER_TRAIT)
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};
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template <typename T>
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struct static_proxy
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{
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#if defined(ASIO_HAS_DEDUCED_QUERY_STATIC_CONSTEXPR_MEMBER_TRAIT)
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struct type
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{
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template <typename P>
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static constexpr auto query(ASIO_MOVE_ARG(P) p)
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noexcept(
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noexcept(
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conditional<true, T, P>::type::query(ASIO_MOVE_CAST(P)(p))
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)
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)
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-> decltype(
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conditional<true, T, P>::type::query(ASIO_MOVE_CAST(P)(p))
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)
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{
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return T::query(ASIO_MOVE_CAST(P)(p));
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}
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};
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#else // defined(ASIO_HAS_DEDUCED_QUERY_STATIC_CONSTEXPR_MEMBER_TRAIT)
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typedef T type;
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#endif // defined(ASIO_HAS_DEDUCED_QUERY_STATIC_CONSTEXPR_MEMBER_TRAIT)
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};
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template <typename T>
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struct query_member :
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traits::query_member<typename proxy<T>::type, blocking_adaptation_t> {};
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template <typename T>
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struct query_static_constexpr_member :
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traits::query_static_constexpr_member<
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typename static_proxy<T>::type, blocking_adaptation_t> {};
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#if defined(ASIO_HAS_DEDUCED_STATIC_QUERY_TRAIT) \
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&& defined(ASIO_HAS_SFINAE_VARIABLE_TEMPLATES)
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template <typename T>
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static ASIO_CONSTEXPR
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typename query_static_constexpr_member<T>::result_type
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static_query()
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ASIO_NOEXCEPT_IF((
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query_static_constexpr_member<T>::is_noexcept))
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{
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return query_static_constexpr_member<T>::value();
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}
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template <typename T>
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static ASIO_CONSTEXPR
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typename traits::static_query<T, disallowed_t>::result_type
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static_query(
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typename enable_if<
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!query_static_constexpr_member<T>::is_valid
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>::type* = 0,
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typename enable_if<
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!query_member<T>::is_valid
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>::type* = 0,
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typename enable_if<
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traits::static_query<T, disallowed_t>::is_valid
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>::type* = 0) ASIO_NOEXCEPT
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{
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return traits::static_query<T, disallowed_t>::value();
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}
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template <typename T>
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static ASIO_CONSTEXPR
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typename traits::static_query<T, allowed_t>::result_type
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static_query(
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typename enable_if<
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!query_static_constexpr_member<T>::is_valid
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>::type* = 0,
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typename enable_if<
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!query_member<T>::is_valid
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>::type* = 0,
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typename enable_if<
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!traits::static_query<T, disallowed_t>::is_valid
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>::type* = 0,
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typename enable_if<
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traits::static_query<T, allowed_t>::is_valid
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>::type* = 0) ASIO_NOEXCEPT
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{
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return traits::static_query<T, allowed_t>::value();
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}
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template <typename E,
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typename T = decltype(blocking_adaptation_t::static_query<E>())>
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static ASIO_CONSTEXPR const T static_query_v
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= blocking_adaptation_t::static_query<E>();
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#endif // defined(ASIO_HAS_DEDUCED_STATIC_QUERY_TRAIT)
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// && defined(ASIO_HAS_SFINAE_VARIABLE_TEMPLATES)
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friend ASIO_CONSTEXPR bool operator==(
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const blocking_adaptation_t& a, const blocking_adaptation_t& b)
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{
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return a.value_ == b.value_;
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}
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friend ASIO_CONSTEXPR bool operator!=(
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const blocking_adaptation_t& a, const blocking_adaptation_t& b)
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{
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return a.value_ != b.value_;
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}
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struct convertible_from_blocking_adaptation_t
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{
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ASIO_CONSTEXPR convertible_from_blocking_adaptation_t(
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blocking_adaptation_t)
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{
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}
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};
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template <typename Executor>
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friend ASIO_CONSTEXPR blocking_adaptation_t query(
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const Executor& ex, convertible_from_blocking_adaptation_t,
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typename enable_if<
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can_query<const Executor&, disallowed_t>::value
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>::type* = 0)
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#if !defined(__clang__) // Clang crashes if noexcept is used here.
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#if defined(ASIO_MSVC) // Visual C++ wants the type to be qualified.
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ASIO_NOEXCEPT_IF((
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is_nothrow_query<const Executor&,
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blocking_adaptation_t<>::disallowed_t>::value))
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#else // defined(ASIO_MSVC)
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ASIO_NOEXCEPT_IF((
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is_nothrow_query<const Executor&, disallowed_t>::value))
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#endif // defined(ASIO_MSVC)
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#endif // !defined(__clang__)
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{
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return asio::query(ex, disallowed_t());
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}
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template <typename Executor>
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friend ASIO_CONSTEXPR blocking_adaptation_t query(
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const Executor& ex, convertible_from_blocking_adaptation_t,
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typename enable_if<
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!can_query<const Executor&, disallowed_t>::value
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>::type* = 0,
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typename enable_if<
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can_query<const Executor&, allowed_t>::value
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>::type* = 0)
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#if !defined(__clang__) // Clang crashes if noexcept is used here.
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#if defined(ASIO_MSVC) // Visual C++ wants the type to be qualified.
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ASIO_NOEXCEPT_IF((
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is_nothrow_query<const Executor&,
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blocking_adaptation_t<>::allowed_t>::value))
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#else // defined(ASIO_MSVC)
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ASIO_NOEXCEPT_IF((
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is_nothrow_query<const Executor&, allowed_t>::value))
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#endif // defined(ASIO_MSVC)
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#endif // !defined(__clang__)
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{
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return asio::query(ex, allowed_t());
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}
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ASIO_STATIC_CONSTEXPR_DEFAULT_INIT(disallowed_t, disallowed);
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ASIO_STATIC_CONSTEXPR_DEFAULT_INIT(allowed_t, allowed);
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#if !defined(ASIO_HAS_CONSTEXPR)
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static const blocking_adaptation_t instance;
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#endif // !defined(ASIO_HAS_CONSTEXPR)
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private:
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int value_;
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};
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#if defined(ASIO_HAS_DEDUCED_STATIC_QUERY_TRAIT) \
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&& defined(ASIO_HAS_SFINAE_VARIABLE_TEMPLATES)
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template <int I> template <typename E, typename T>
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const T blocking_adaptation_t<I>::static_query_v;
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#endif // defined(ASIO_HAS_DEDUCED_STATIC_QUERY_TRAIT)
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// && defined(ASIO_HAS_SFINAE_VARIABLE_TEMPLATES)
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#if !defined(ASIO_HAS_CONSTEXPR)
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template <int I>
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const blocking_adaptation_t<I> blocking_adaptation_t<I>::instance;
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#endif
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template <int I>
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const typename blocking_adaptation_t<I>::disallowed_t
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blocking_adaptation_t<I>::disallowed;
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template <int I>
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const typename blocking_adaptation_t<I>::allowed_t
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blocking_adaptation_t<I>::allowed;
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namespace blocking_adaptation {
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template <int I = 0>
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struct disallowed_t
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{
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#if defined(ASIO_HAS_VARIABLE_TEMPLATES)
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# if defined(ASIO_NO_DEPRECATED)
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template <typename T>
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ASIO_STATIC_CONSTEXPR(bool,
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is_applicable_property_v = (
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is_executor<T>::value));
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# else // defined(ASIO_NO_DEPRECATED)
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template <typename T>
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ASIO_STATIC_CONSTEXPR(bool,
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is_applicable_property_v = (
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is_executor<T>::value
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|| conditional<
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is_executor<T>::value,
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false_type,
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is_sender<T>
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>::type::value
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|| conditional<
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is_executor<T>::value,
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false_type,
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is_scheduler<T>
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>::type::value
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));
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# endif // defined(ASIO_NO_DEPRECATED)
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#endif // defined(ASIO_HAS_VARIABLE_TEMPLATES)
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ASIO_STATIC_CONSTEXPR(bool, is_requirable = true);
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ASIO_STATIC_CONSTEXPR(bool, is_preferable = true);
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typedef blocking_adaptation_t<I> polymorphic_query_result_type;
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ASIO_CONSTEXPR disallowed_t()
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{
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}
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template <typename T>
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struct query_member :
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traits::query_member<
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typename blocking_adaptation_t<I>::template proxy<T>::type,
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disallowed_t> {};
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template <typename T>
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struct query_static_constexpr_member :
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traits::query_static_constexpr_member<
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typename blocking_adaptation_t<I>::template static_proxy<T>::type,
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disallowed_t> {};
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#if defined(ASIO_HAS_DEDUCED_STATIC_QUERY_TRAIT) \
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&& defined(ASIO_HAS_SFINAE_VARIABLE_TEMPLATES)
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template <typename T>
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static ASIO_CONSTEXPR
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typename query_static_constexpr_member<T>::result_type
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static_query()
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ASIO_NOEXCEPT_IF((
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query_static_constexpr_member<T>::is_noexcept))
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{
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return query_static_constexpr_member<T>::value();
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}
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template <typename T>
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static ASIO_CONSTEXPR disallowed_t static_query(
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typename enable_if<
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!query_static_constexpr_member<T>::is_valid
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>::type* = 0,
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typename enable_if<
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!query_member<T>::is_valid
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>::type* = 0,
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typename enable_if<
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!traits::query_free<T, disallowed_t>::is_valid
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>::type* = 0,
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typename enable_if<
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!can_query<T, allowed_t<I> >::value
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>::type* = 0) ASIO_NOEXCEPT
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{
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return disallowed_t();
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}
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template <typename E, typename T = decltype(disallowed_t::static_query<E>())>
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static ASIO_CONSTEXPR const T static_query_v
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= disallowed_t::static_query<E>();
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#endif // defined(ASIO_HAS_DEDUCED_STATIC_QUERY_TRAIT)
|
|
// && defined(ASIO_HAS_SFINAE_VARIABLE_TEMPLATES)
|
|
|
|
static ASIO_CONSTEXPR blocking_adaptation_t<I> value()
|
|
{
|
|
return disallowed_t();
|
|
}
|
|
|
|
friend ASIO_CONSTEXPR bool operator==(
|
|
const disallowed_t&, const disallowed_t&)
|
|
{
|
|
return true;
|
|
}
|
|
|
|
friend ASIO_CONSTEXPR bool operator!=(
|
|
const disallowed_t&, const disallowed_t&)
|
|
{
|
|
return false;
|
|
}
|
|
};
|
|
|
|
#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) 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 allowed_t<I> query(
|
|
blocking_adaptation_t<I>) ASIO_NOEXCEPT
|
|
{
|
|
return allowed_t<I>();
|
|
}
|
|
|
|
template <int I>
|
|
static ASIO_CONSTEXPR allowed_t<I> query(
|
|
allowed_t<I>) ASIO_NOEXCEPT
|
|
{
|
|
return allowed_t<I>();
|
|
}
|
|
|
|
template <int I>
|
|
static ASIO_CONSTEXPR allowed_t<I> query(
|
|
disallowed_t<I>) ASIO_NOEXCEPT
|
|
{
|
|
return allowed_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>
|
|
Executor require(disallowed_t<I>) const ASIO_NOEXCEPT
|
|
{
|
|
return executor_;
|
|
}
|
|
|
|
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<
|
|
#if defined(ASIO_NO_DEPRECATED)
|
|
traits::execute_member<const Executor&, Function>::is_valid
|
|
#else // defined(ASIO_NO_DEPRECATED)
|
|
execution::can_execute<const Executor&, Function>::value
|
|
#endif // defined(ASIO_NO_DEPRECATED)
|
|
>::type execute(ASIO_MOVE_ARG(Function) f) const
|
|
{
|
|
#if defined(ASIO_NO_DEPRECATED)
|
|
executor_.execute(ASIO_MOVE_CAST(Function)(f));
|
|
#else // defined(ASIO_NO_DEPRECATED)
|
|
execution::execute(executor_, ASIO_MOVE_CAST(Function)(f));
|
|
#endif // defined(ASIO_NO_DEPRECATED)
|
|
}
|
|
|
|
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 allowed_t
|
|
{
|
|
#if defined(ASIO_HAS_VARIABLE_TEMPLATES)
|
|
# if defined(ASIO_NO_DEPRECATED)
|
|
template <typename T>
|
|
ASIO_STATIC_CONSTEXPR(bool,
|
|
is_applicable_property_v = (
|
|
is_executor<T>::value));
|
|
# else // defined(ASIO_NO_DEPRECATED)
|
|
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_NO_DEPRECATED)
|
|
#endif // defined(ASIO_HAS_VARIABLE_TEMPLATES)
|
|
|
|
ASIO_STATIC_CONSTEXPR(bool, is_requirable = true);
|
|
ASIO_STATIC_CONSTEXPR(bool, is_preferable = false);
|
|
typedef blocking_adaptation_t<I> polymorphic_query_result_type;
|
|
|
|
ASIO_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 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(allowed_t::static_query<E>())>
|
|
static ASIO_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 ASIO_CONSTEXPR blocking_adaptation_t<I> value()
|
|
{
|
|
return allowed_t();
|
|
}
|
|
|
|
friend ASIO_CONSTEXPR bool operator==(
|
|
const allowed_t&, const allowed_t&)
|
|
{
|
|
return true;
|
|
}
|
|
|
|
friend ASIO_CONSTEXPR bool operator!=(
|
|
const allowed_t&, const allowed_t&)
|
|
{
|
|
return false;
|
|
}
|
|
|
|
template <typename Executor>
|
|
friend adapter<Executor> require(
|
|
const Executor& e, const allowed_t&,
|
|
typename enable_if<
|
|
is_executor<Executor>::value
|
|
>::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 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(ASIO_MOVE_ARG(F) f)
|
|
: func_(ASIO_MOVE_CAST(F)(f)),
|
|
is_complete_(false)
|
|
{
|
|
}
|
|
|
|
template <typename Executor>
|
|
void execute_and_wait(ASIO_MOVE_ARG(Executor) ex)
|
|
{
|
|
handler h = { this };
|
|
#if defined(ASIO_NO_DEPRECATED)
|
|
ex.execute(h);
|
|
#else // defined(ASIO_NO_DEPRECATED)
|
|
execution::execute(ASIO_MOVE_CAST(Executor)(ex), h);
|
|
#endif // defined(ASIO_NO_DEPRECATED)
|
|
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(
|
|
ASIO_MOVE_ARG(Executor) ex,
|
|
ASIO_MOVE_ARG(Function) func)
|
|
{
|
|
typedef typename decay<Function>::type func_t;
|
|
blocking_execute_state<func_t> state(ASIO_MOVE_CAST(Function)(func));
|
|
state.execute_and_wait(ex);
|
|
}
|
|
|
|
} // namespace blocking_adaptation
|
|
} // namespace detail
|
|
|
|
typedef detail::blocking_adaptation_t<> blocking_adaptation_t;
|
|
|
|
#if defined(ASIO_HAS_CONSTEXPR) || defined(GENERATING_DOCUMENTATION)
|
|
constexpr blocking_adaptation_t blocking_adaptation;
|
|
#else // defined(ASIO_HAS_CONSTEXPR) || defined(GENERATING_DOCUMENTATION)
|
|
namespace { static const blocking_adaptation_t&
|
|
blocking_adaptation = blocking_adaptation_t::instance; }
|
|
#endif
|
|
|
|
} // 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
|
|
#if !defined(ASIO_NO_DEPRECATED)
|
|
|| 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_NO_DEPRECATED)
|
|
>
|
|
{
|
|
};
|
|
|
|
template <typename T>
|
|
struct is_applicable_property<T, execution::blocking_adaptation_t::disallowed_t>
|
|
: integral_constant<bool,
|
|
execution::is_executor<T>::value
|
|
#if !defined(ASIO_NO_DEPRECATED)
|
|
|| 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_NO_DEPRECATED)
|
|
>
|
|
{
|
|
};
|
|
|
|
template <typename T>
|
|
struct is_applicable_property<T, execution::blocking_adaptation_t::allowed_t>
|
|
: integral_constant<bool,
|
|
execution::is_executor<T>::value
|
|
#if !defined(ASIO_NO_DEPRECATED)
|
|
|| 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_NO_DEPRECATED)
|
|
>
|
|
{
|
|
};
|
|
|
|
#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,
|
|
typename enable_if<
|
|
can_query<T, execution::blocking_adaptation_t::disallowed_t>::value
|
|
>::type>
|
|
{
|
|
ASIO_STATIC_CONSTEXPR(bool, is_valid = true);
|
|
ASIO_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,
|
|
typename enable_if<
|
|
!can_query<T, execution::blocking_adaptation_t::disallowed_t>::value
|
|
&& can_query<T, execution::blocking_adaptation_t::allowed_t>::value
|
|
>::type>
|
|
{
|
|
ASIO_STATIC_CONSTEXPR(bool, is_valid = true);
|
|
ASIO_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,
|
|
typename enable_if<
|
|
execution::detail::blocking_adaptation_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_adaptation_t<0>::
|
|
query_static_constexpr_member<T>::result_type result_type;
|
|
|
|
static ASIO_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,
|
|
typename enable_if<
|
|
!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
|
|
>::type>
|
|
{
|
|
ASIO_STATIC_CONSTEXPR(bool, is_valid = true);
|
|
ASIO_STATIC_CONSTEXPR(bool, is_noexcept = true);
|
|
|
|
typedef typename traits::static_query<T,
|
|
execution::blocking_adaptation_t::disallowed_t>::result_type result_type;
|
|
|
|
static ASIO_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,
|
|
typename enable_if<
|
|
!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
|
|
>::type>
|
|
{
|
|
ASIO_STATIC_CONSTEXPR(bool, is_valid = true);
|
|
ASIO_STATIC_CONSTEXPR(bool, is_noexcept = true);
|
|
|
|
typedef typename traits::static_query<T,
|
|
execution::blocking_adaptation_t::allowed_t>::result_type result_type;
|
|
|
|
static ASIO_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,
|
|
typename enable_if<
|
|
execution::detail::blocking_adaptation::disallowed_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_adaptation::disallowed_t<0>::
|
|
query_static_constexpr_member<T>::result_type result_type;
|
|
|
|
static ASIO_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,
|
|
typename enable_if<
|
|
!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
|
|
>::type>
|
|
{
|
|
ASIO_STATIC_CONSTEXPR(bool, is_valid = true);
|
|
ASIO_STATIC_CONSTEXPR(bool, is_noexcept = true);
|
|
|
|
typedef execution::blocking_adaptation_t::disallowed_t result_type;
|
|
|
|
static ASIO_CONSTEXPR result_type value()
|
|
{
|
|
return result_type();
|
|
}
|
|
};
|
|
|
|
template <typename T>
|
|
struct static_query<T, execution::blocking_adaptation_t::allowed_t,
|
|
typename enable_if<
|
|
execution::detail::blocking_adaptation::allowed_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_adaptation::allowed_t<0>::
|
|
query_static_constexpr_member<T>::result_type result_type;
|
|
|
|
static ASIO_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_STATIC_REQUIRE_TRAIT)
|
|
|
|
template <typename T>
|
|
struct static_require<T, execution::blocking_adaptation_t::disallowed_t,
|
|
typename enable_if<
|
|
static_query<T, execution::blocking_adaptation_t::disallowed_t>::is_valid
|
|
>::type>
|
|
{
|
|
ASIO_STATIC_CONSTEXPR(bool, is_valid =
|
|
(is_same<typename static_query<T,
|
|
execution::blocking_adaptation_t::disallowed_t>::result_type,
|
|
execution::blocking_adaptation_t::disallowed_t>::value));
|
|
};
|
|
|
|
template <typename T>
|
|
struct static_require<T, execution::blocking_adaptation_t::allowed_t,
|
|
typename enable_if<
|
|
static_query<T, execution::blocking_adaptation_t::allowed_t>::is_valid
|
|
>::type>
|
|
{
|
|
ASIO_STATIC_CONSTEXPR(bool, is_valid =
|
|
(is_same<typename static_query<T,
|
|
execution::blocking_adaptation_t::allowed_t>::result_type,
|
|
execution::blocking_adaptation_t::allowed_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_adaptation_t::allowed_t,
|
|
typename enable_if<
|
|
is_same<T, typename decay<T>::type>::value
|
|
&& execution::is_executor<T>::value
|
|
>::type>
|
|
{
|
|
ASIO_STATIC_CONSTEXPR(bool, is_valid = true);
|
|
ASIO_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> >
|
|
{
|
|
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_adaptation::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_adaptation::adapter<Executor>,
|
|
execution::detail::blocking_adaptation_t<I> >
|
|
{
|
|
ASIO_STATIC_CONSTEXPR(bool, is_valid = true);
|
|
ASIO_STATIC_CONSTEXPR(bool, is_noexcept = true);
|
|
typedef execution::blocking_adaptation_t::allowed_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_adaptation::adapter<Executor>,
|
|
execution::detail::blocking_adaptation::allowed_t<I> >
|
|
{
|
|
ASIO_STATIC_CONSTEXPR(bool, is_valid = true);
|
|
ASIO_STATIC_CONSTEXPR(bool, is_noexcept = true);
|
|
typedef execution::blocking_adaptation_t::allowed_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_adaptation::adapter<Executor>,
|
|
execution::detail::blocking_adaptation::disallowed_t<I> >
|
|
{
|
|
ASIO_STATIC_CONSTEXPR(bool, is_valid = true);
|
|
ASIO_STATIC_CONSTEXPR(bool, is_noexcept = true);
|
|
typedef execution::blocking_adaptation_t::allowed_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_adaptation::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_adaptation::adapter<Executor>,
|
|
execution::detail::blocking_adaptation::disallowed_t<I> >
|
|
{
|
|
ASIO_STATIC_CONSTEXPR(bool, is_valid = true);
|
|
ASIO_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,
|
|
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_adaptation::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_adaptation::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_adaptation::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_ADAPTATION_HPP
|