1117 lines
32 KiB
C++
1117 lines
32 KiB
C++
//
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// execution/mapping.hpp
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// ~~~~~~~~~~~~~~~~~~~~~
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//
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// Copyright (c) 2003-2021 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_MAPPING_HPP
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#define ASIO_EXECUTION_MAPPING_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/type_traits.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/query.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/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 what guarantees an executor makes about the mapping
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/// of execution agents on to threads of execution.
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struct mapping_t
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{
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/// The mapping_t property applies to executors, 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 top-level mapping_t property cannot be required.
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static constexpr bool is_requirable = false;
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/// The top-level mapping_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 mapping_t polymorphic_query_result_type;
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/// A sub-property that indicates that execution agents are mapped on to
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/// threads of execution.
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struct thread_t
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{
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/// The mapping_t::thread_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 mapping_t::thread_t property can be required.
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static constexpr bool is_requirable = true;
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/// The mapping_t::thread_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 mapping_t polymorphic_query_result_type;
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/// Default constructor.
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constexpr thread_t();
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/// Get the value associated with a property object.
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/**
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* @returns thread_t();
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*/
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static constexpr mapping_t value();
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};
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/// A sub-property that indicates that execution agents are mapped on to
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/// new threads of execution.
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struct new_thread_t
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{
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/// The mapping_t::new_thread_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 mapping_t::new_thread_t property can be required.
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static constexpr bool is_requirable = true;
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/// The mapping_t::new_thread_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 mapping_t polymorphic_query_result_type;
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/// Default constructor.
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constexpr new_thread_t();
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/// Get the value associated with a property object.
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/**
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* @returns new_thread_t();
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*/
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static constexpr mapping_t value();
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};
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/// A sub-property that indicates that the mapping of execution agents is
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/// implementation-defined.
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struct other_t
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{
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/// The mapping_t::other_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 mapping_t::other_t property can be required.
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static constexpr bool is_requirable = true;
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/// The mapping_t::other_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 mapping_t polymorphic_query_result_type;
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/// Default constructor.
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constexpr other_t();
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/// Get the value associated with a property object.
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/**
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* @returns other_t();
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*/
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static constexpr mapping_t value();
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};
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/// A special value used for accessing the mapping_t::thread_t property.
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static constexpr thread_t thread;
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/// A special value used for accessing the mapping_t::new_thread_t property.
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static constexpr new_thread_t new_thread;
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/// A special value used for accessing the mapping_t::other_t property.
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static constexpr other_t other;
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/// Default constructor.
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constexpr mapping_t();
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/// Construct from a sub-property value.
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constexpr mapping_t(thread_t);
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/// Construct from a sub-property value.
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constexpr mapping_t(new_thread_t);
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/// Construct from a sub-property value.
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constexpr mapping_t(other_t);
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/// Compare property values for equality.
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friend constexpr bool operator==(
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const mapping_t& a, const mapping_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 mapping_t& a, const mapping_t& b) noexcept;
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};
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/// A special value used for accessing the mapping_t property.
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constexpr mapping_t mapping;
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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 mapping {
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template <int I> struct thread_t;
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template <int I> struct new_thread_t;
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template <int I> struct other_t;
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} // namespace mapping
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template <int I = 0>
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struct mapping_t
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{
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#if defined(ASIO_HAS_VARIABLE_TEMPLATES)
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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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#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 mapping_t polymorphic_query_result_type;
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typedef detail::mapping::thread_t<I> thread_t;
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typedef detail::mapping::new_thread_t<I> new_thread_t;
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typedef detail::mapping::other_t<I> other_t;
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ASIO_CONSTEXPR mapping_t()
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: value_(-1)
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{
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}
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ASIO_CONSTEXPR mapping_t(thread_t)
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: value_(0)
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{
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}
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ASIO_CONSTEXPR mapping_t(new_thread_t)
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: value_(1)
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{
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}
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ASIO_CONSTEXPR mapping_t(other_t)
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: value_(2)
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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, mapping_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, mapping_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, thread_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, thread_t>::is_valid
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>::type* = 0) ASIO_NOEXCEPT
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{
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return traits::static_query<T, thread_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, new_thread_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, thread_t>::is_valid
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>::type* = 0,
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typename enable_if<
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traits::static_query<T, new_thread_t>::is_valid
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>::type* = 0) ASIO_NOEXCEPT
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{
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return traits::static_query<T, new_thread_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, other_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, thread_t>::is_valid
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>::type* = 0,
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typename enable_if<
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!traits::static_query<T, new_thread_t>::is_valid
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>::type* = 0,
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typename enable_if<
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traits::static_query<T, other_t>::is_valid
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>::type* = 0) ASIO_NOEXCEPT
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{
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return traits::static_query<T, other_t>::value();
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}
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template <typename E, typename T = decltype(mapping_t::static_query<E>())>
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static ASIO_CONSTEXPR const T static_query_v
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= mapping_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 mapping_t& a, const mapping_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 mapping_t& a, const mapping_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_mapping_t
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{
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ASIO_CONSTEXPR convertible_from_mapping_t(mapping_t) {}
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};
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template <typename Executor>
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friend ASIO_CONSTEXPR mapping_t query(
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const Executor& ex, convertible_from_mapping_t,
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typename enable_if<
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can_query<const Executor&, thread_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&, mapping_t<>::thread_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&, thread_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, thread_t());
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}
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template <typename Executor>
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friend ASIO_CONSTEXPR mapping_t query(
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const Executor& ex, convertible_from_mapping_t,
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typename enable_if<
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!can_query<const Executor&, thread_t>::value
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>::type* = 0,
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typename enable_if<
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can_query<const Executor&, new_thread_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&, mapping_t<>::new_thread_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&, new_thread_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, new_thread_t());
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}
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template <typename Executor>
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friend ASIO_CONSTEXPR mapping_t query(
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const Executor& ex, convertible_from_mapping_t,
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typename enable_if<
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!can_query<const Executor&, thread_t>::value
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>::type* = 0,
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typename enable_if<
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!can_query<const Executor&, new_thread_t>::value
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>::type* = 0,
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typename enable_if<
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can_query<const Executor&, other_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&, mapping_t<>::other_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&, other_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, other_t());
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}
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ASIO_STATIC_CONSTEXPR_DEFAULT_INIT(thread_t, thread);
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ASIO_STATIC_CONSTEXPR_DEFAULT_INIT(new_thread_t, new_thread);
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ASIO_STATIC_CONSTEXPR_DEFAULT_INIT(other_t, other);
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#if !defined(ASIO_HAS_CONSTEXPR)
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static const mapping_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 mapping_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 mapping_t<I> mapping_t<I>::instance;
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#endif
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template <int I>
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const typename mapping_t<I>::thread_t mapping_t<I>::thread;
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template <int I>
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const typename mapping_t<I>::new_thread_t mapping_t<I>::new_thread;
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template <int I>
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const typename mapping_t<I>::other_t mapping_t<I>::other;
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namespace mapping {
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template <int I = 0>
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struct thread_t
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{
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#if defined(ASIO_HAS_VARIABLE_TEMPLATES)
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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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#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 mapping_t<I> polymorphic_query_result_type;
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|
|
|
ASIO_CONSTEXPR thread_t()
|
|
{
|
|
}
|
|
|
|
template <typename T>
|
|
struct query_member :
|
|
traits::query_member<
|
|
typename mapping_t<I>::template proxy<T>::type, thread_t> {};
|
|
|
|
template <typename T>
|
|
struct query_static_constexpr_member :
|
|
traits::query_static_constexpr_member<
|
|
typename mapping_t<I>::template static_proxy<T>::type, thread_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 thread_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, thread_t>::is_valid
|
|
>::type* = 0,
|
|
typename enable_if<
|
|
!can_query<T, new_thread_t<I> >::value
|
|
>::type* = 0,
|
|
typename enable_if<
|
|
!can_query<T, other_t<I> >::value
|
|
>::type* = 0) ASIO_NOEXCEPT
|
|
{
|
|
return thread_t();
|
|
}
|
|
|
|
template <typename E, typename T = decltype(thread_t::static_query<E>())>
|
|
static ASIO_CONSTEXPR const T static_query_v
|
|
= thread_t::static_query<E>();
|
|
#endif // defined(ASIO_HAS_DEDUCED_STATIC_QUERY_TRAIT)
|
|
// && defined(ASIO_HAS_SFINAE_VARIABLE_TEMPLATES)
|
|
|
|
static ASIO_CONSTEXPR mapping_t<I> value()
|
|
{
|
|
return thread_t();
|
|
}
|
|
|
|
friend ASIO_CONSTEXPR bool operator==(
|
|
const thread_t&, const thread_t&)
|
|
{
|
|
return true;
|
|
}
|
|
|
|
friend ASIO_CONSTEXPR bool operator!=(
|
|
const thread_t&, const thread_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 thread_t<I>::static_query_v;
|
|
#endif // defined(ASIO_HAS_DEDUCED_STATIC_QUERY_TRAIT)
|
|
// && defined(ASIO_HAS_SFINAE_VARIABLE_TEMPLATES)
|
|
|
|
template <int I = 0>
|
|
struct new_thread_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 mapping_t<I> polymorphic_query_result_type;
|
|
|
|
ASIO_CONSTEXPR new_thread_t()
|
|
{
|
|
}
|
|
|
|
template <typename T>
|
|
struct query_member :
|
|
traits::query_member<
|
|
typename mapping_t<I>::template proxy<T>::type, new_thread_t> {};
|
|
|
|
template <typename T>
|
|
struct query_static_constexpr_member :
|
|
traits::query_static_constexpr_member<
|
|
typename mapping_t<I>::template static_proxy<T>::type, new_thread_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(new_thread_t::static_query<E>())>
|
|
static ASIO_CONSTEXPR const T static_query_v
|
|
= new_thread_t::static_query<E>();
|
|
#endif // defined(ASIO_HAS_DEDUCED_STATIC_QUERY_TRAIT)
|
|
// && defined(ASIO_HAS_SFINAE_VARIABLE_TEMPLATES)
|
|
|
|
static ASIO_CONSTEXPR mapping_t<I> value()
|
|
{
|
|
return new_thread_t();
|
|
}
|
|
|
|
friend ASIO_CONSTEXPR bool operator==(
|
|
const new_thread_t&, const new_thread_t&)
|
|
{
|
|
return true;
|
|
}
|
|
|
|
friend ASIO_CONSTEXPR bool operator!=(
|
|
const new_thread_t&, const new_thread_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 new_thread_t<I>::static_query_v;
|
|
#endif // defined(ASIO_HAS_DEDUCED_STATIC_QUERY_TRAIT)
|
|
// && defined(ASIO_HAS_SFINAE_VARIABLE_TEMPLATES)
|
|
|
|
template <int I>
|
|
struct other_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 mapping_t<I> polymorphic_query_result_type;
|
|
|
|
ASIO_CONSTEXPR other_t()
|
|
{
|
|
}
|
|
|
|
template <typename T>
|
|
struct query_member :
|
|
traits::query_member<
|
|
typename mapping_t<I>::template proxy<T>::type, other_t> {};
|
|
|
|
template <typename T>
|
|
struct query_static_constexpr_member :
|
|
traits::query_static_constexpr_member<
|
|
typename mapping_t<I>::template static_proxy<T>::type, other_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(other_t::static_query<E>())>
|
|
static ASIO_CONSTEXPR const T static_query_v
|
|
= other_t::static_query<E>();
|
|
#endif // defined(ASIO_HAS_DEDUCED_STATIC_QUERY_TRAIT)
|
|
// && defined(ASIO_HAS_SFINAE_VARIABLE_TEMPLATES)
|
|
|
|
static ASIO_CONSTEXPR mapping_t<I> value()
|
|
{
|
|
return other_t();
|
|
}
|
|
|
|
friend ASIO_CONSTEXPR bool operator==(
|
|
const other_t&, const other_t&)
|
|
{
|
|
return true;
|
|
}
|
|
|
|
friend ASIO_CONSTEXPR bool operator!=(
|
|
const other_t&, const other_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 other_t<I>::static_query_v;
|
|
#endif // defined(ASIO_HAS_DEDUCED_STATIC_QUERY_TRAIT)
|
|
// && defined(ASIO_HAS_SFINAE_VARIABLE_TEMPLATES)
|
|
|
|
} // namespace mapping
|
|
} // namespace detail
|
|
|
|
typedef detail::mapping_t<> mapping_t;
|
|
|
|
#if defined(ASIO_HAS_CONSTEXPR) || defined(GENERATING_DOCUMENTATION)
|
|
constexpr mapping_t mapping;
|
|
#else // defined(ASIO_HAS_CONSTEXPR) || defined(GENERATING_DOCUMENTATION)
|
|
namespace { static const mapping_t& mapping = mapping_t::instance; }
|
|
#endif
|
|
|
|
} // namespace execution
|
|
|
|
#if !defined(ASIO_HAS_VARIABLE_TEMPLATES)
|
|
|
|
template <typename T>
|
|
struct is_applicable_property<T, execution::mapping_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::mapping_t::thread_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::mapping_t::new_thread_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::mapping_t::other_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::mapping_t,
|
|
typename enable_if<
|
|
can_query<T, execution::mapping_t::thread_t>::value
|
|
>::type>
|
|
{
|
|
ASIO_STATIC_CONSTEXPR(bool, is_valid = true);
|
|
ASIO_STATIC_CONSTEXPR(bool, is_noexcept =
|
|
(is_nothrow_query<T, execution::mapping_t::thread_t>::value));
|
|
|
|
typedef execution::mapping_t result_type;
|
|
};
|
|
|
|
template <typename T>
|
|
struct query_free_default<T, execution::mapping_t,
|
|
typename enable_if<
|
|
!can_query<T, execution::mapping_t::thread_t>::value
|
|
&& can_query<T, execution::mapping_t::new_thread_t>::value
|
|
>::type>
|
|
{
|
|
ASIO_STATIC_CONSTEXPR(bool, is_valid = true);
|
|
ASIO_STATIC_CONSTEXPR(bool, is_noexcept =
|
|
(is_nothrow_query<T, execution::mapping_t::new_thread_t>::value));
|
|
|
|
typedef execution::mapping_t result_type;
|
|
};
|
|
|
|
template <typename T>
|
|
struct query_free_default<T, execution::mapping_t,
|
|
typename enable_if<
|
|
!can_query<T, execution::mapping_t::thread_t>::value
|
|
&& !can_query<T, execution::mapping_t::new_thread_t>::value
|
|
&& can_query<T, execution::mapping_t::other_t>::value
|
|
>::type>
|
|
{
|
|
ASIO_STATIC_CONSTEXPR(bool, is_valid = true);
|
|
ASIO_STATIC_CONSTEXPR(bool, is_noexcept =
|
|
(is_nothrow_query<T, execution::mapping_t::other_t>::value));
|
|
|
|
typedef execution::mapping_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::mapping_t,
|
|
typename enable_if<
|
|
execution::detail::mapping_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::mapping_t<0>::
|
|
query_static_constexpr_member<T>::result_type result_type;
|
|
|
|
static ASIO_CONSTEXPR result_type value()
|
|
{
|
|
return execution::detail::mapping_t<0>::
|
|
query_static_constexpr_member<T>::value();
|
|
}
|
|
};
|
|
|
|
template <typename T>
|
|
struct static_query<T, execution::mapping_t,
|
|
typename enable_if<
|
|
!execution::detail::mapping_t<0>::
|
|
query_static_constexpr_member<T>::is_valid
|
|
&& !execution::detail::mapping_t<0>::
|
|
query_member<T>::is_valid
|
|
&& traits::static_query<T, execution::mapping_t::thread_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::mapping_t::thread_t>::result_type result_type;
|
|
|
|
static ASIO_CONSTEXPR result_type value()
|
|
{
|
|
return traits::static_query<T, execution::mapping_t::thread_t>::value();
|
|
}
|
|
};
|
|
|
|
template <typename T>
|
|
struct static_query<T, execution::mapping_t,
|
|
typename enable_if<
|
|
!execution::detail::mapping_t<0>::
|
|
query_static_constexpr_member<T>::is_valid
|
|
&& !execution::detail::mapping_t<0>::
|
|
query_member<T>::is_valid
|
|
&& !traits::static_query<T, execution::mapping_t::thread_t>::is_valid
|
|
&& traits::static_query<T, execution::mapping_t::new_thread_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::mapping_t::new_thread_t>::result_type result_type;
|
|
|
|
static ASIO_CONSTEXPR result_type value()
|
|
{
|
|
return traits::static_query<T, execution::mapping_t::new_thread_t>::value();
|
|
}
|
|
};
|
|
|
|
template <typename T>
|
|
struct static_query<T, execution::mapping_t,
|
|
typename enable_if<
|
|
!execution::detail::mapping_t<0>::
|
|
query_static_constexpr_member<T>::is_valid
|
|
&& !execution::detail::mapping_t<0>::
|
|
query_member<T>::is_valid
|
|
&& !traits::static_query<T, execution::mapping_t::thread_t>::is_valid
|
|
&& !traits::static_query<T, execution::mapping_t::new_thread_t>::is_valid
|
|
&& traits::static_query<T, execution::mapping_t::other_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::mapping_t::other_t>::result_type result_type;
|
|
|
|
static ASIO_CONSTEXPR result_type value()
|
|
{
|
|
return traits::static_query<T, execution::mapping_t::other_t>::value();
|
|
}
|
|
};
|
|
|
|
template <typename T>
|
|
struct static_query<T, execution::mapping_t::thread_t,
|
|
typename enable_if<
|
|
execution::detail::mapping::thread_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::mapping::thread_t<0>::
|
|
query_static_constexpr_member<T>::result_type result_type;
|
|
|
|
static ASIO_CONSTEXPR result_type value()
|
|
{
|
|
return execution::detail::mapping::thread_t<0>::
|
|
query_static_constexpr_member<T>::value();
|
|
}
|
|
};
|
|
|
|
template <typename T>
|
|
struct static_query<T, execution::mapping_t::thread_t,
|
|
typename enable_if<
|
|
!execution::detail::mapping::thread_t<0>::
|
|
query_static_constexpr_member<T>::is_valid
|
|
&& !execution::detail::mapping::thread_t<0>::
|
|
query_member<T>::is_valid
|
|
&& !traits::query_free<T, execution::mapping_t::thread_t>::is_valid
|
|
&& !can_query<T, execution::mapping_t::new_thread_t>::value
|
|
&& !can_query<T, execution::mapping_t::other_t>::value
|
|
>::type>
|
|
{
|
|
ASIO_STATIC_CONSTEXPR(bool, is_valid = true);
|
|
ASIO_STATIC_CONSTEXPR(bool, is_noexcept = true);
|
|
|
|
typedef execution::mapping_t::thread_t result_type;
|
|
|
|
static ASIO_CONSTEXPR result_type value()
|
|
{
|
|
return result_type();
|
|
}
|
|
};
|
|
|
|
template <typename T>
|
|
struct static_query<T, execution::mapping_t::new_thread_t,
|
|
typename enable_if<
|
|
execution::detail::mapping::new_thread_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::mapping::new_thread_t<0>::
|
|
query_static_constexpr_member<T>::result_type result_type;
|
|
|
|
static ASIO_CONSTEXPR result_type value()
|
|
{
|
|
return execution::detail::mapping::new_thread_t<0>::
|
|
query_static_constexpr_member<T>::value();
|
|
}
|
|
};
|
|
|
|
template <typename T>
|
|
struct static_query<T, execution::mapping_t::other_t,
|
|
typename enable_if<
|
|
execution::detail::mapping::other_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::mapping::other_t<0>::
|
|
query_static_constexpr_member<T>::result_type result_type;
|
|
|
|
static ASIO_CONSTEXPR result_type value()
|
|
{
|
|
return execution::detail::mapping::other_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::mapping_t::thread_t,
|
|
typename enable_if<
|
|
static_query<T, execution::mapping_t::thread_t>::is_valid
|
|
>::type>
|
|
{
|
|
ASIO_STATIC_CONSTEXPR(bool, is_valid =
|
|
(is_same<typename static_query<T,
|
|
execution::mapping_t::thread_t>::result_type,
|
|
execution::mapping_t::thread_t>::value));
|
|
};
|
|
|
|
template <typename T>
|
|
struct static_require<T, execution::mapping_t::new_thread_t,
|
|
typename enable_if<
|
|
static_query<T, execution::mapping_t::new_thread_t>::is_valid
|
|
>::type>
|
|
{
|
|
ASIO_STATIC_CONSTEXPR(bool, is_valid =
|
|
(is_same<typename static_query<T,
|
|
execution::mapping_t::new_thread_t>::result_type,
|
|
execution::mapping_t::new_thread_t>::value));
|
|
};
|
|
|
|
template <typename T>
|
|
struct static_require<T, execution::mapping_t::other_t,
|
|
typename enable_if<
|
|
static_query<T, execution::mapping_t::other_t>::is_valid
|
|
>::type>
|
|
{
|
|
ASIO_STATIC_CONSTEXPR(bool, is_valid =
|
|
(is_same<typename static_query<T,
|
|
execution::mapping_t::other_t>::result_type,
|
|
execution::mapping_t::other_t>::value));
|
|
};
|
|
|
|
#endif // !defined(ASIO_HAS_DEDUCED_STATIC_REQUIRE_TRAIT)
|
|
|
|
} // namespace traits
|
|
|
|
#endif // defined(GENERATING_DOCUMENTATION)
|
|
|
|
} // namespace asio
|
|
|
|
#include "asio/detail/pop_options.hpp"
|
|
|
|
#endif // ASIO_EXECUTION_MAPPING_HPP
|