| // |
| // execution/mapping.hpp |
| // ~~~~~~~~~~~~~~~~~~~~~ |
| // |
| // Copyright (c) 2003-2021 Christopher M. Kohlhoff (chris at kohlhoff dot com) |
| // |
| // Distributed under the Boost Software License, Version 1.0. (See accompanying |
| // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) |
| // |
| |
| #ifndef BOOST_ASIO_EXECUTION_MAPPING_HPP |
| #define BOOST_ASIO_EXECUTION_MAPPING_HPP |
| |
| #if defined(_MSC_VER) && (_MSC_VER >= 1200) |
| # pragma once |
| #endif // defined(_MSC_VER) && (_MSC_VER >= 1200) |
| |
| #include <boost/asio/detail/config.hpp> |
| #include <boost/asio/detail/type_traits.hpp> |
| #include <boost/asio/execution/executor.hpp> |
| #include <boost/asio/execution/scheduler.hpp> |
| #include <boost/asio/execution/sender.hpp> |
| #include <boost/asio/is_applicable_property.hpp> |
| #include <boost/asio/query.hpp> |
| #include <boost/asio/traits/query_free.hpp> |
| #include <boost/asio/traits/query_member.hpp> |
| #include <boost/asio/traits/query_static_constexpr_member.hpp> |
| #include <boost/asio/traits/static_query.hpp> |
| #include <boost/asio/traits/static_require.hpp> |
| |
| #include <boost/asio/detail/push_options.hpp> |
| |
| namespace boost { |
| namespace asio { |
| |
| #if defined(GENERATING_DOCUMENTATION) |
| |
| namespace execution { |
| |
| /// A property to describe what guarantees an executor makes about the mapping |
| /// of execution agents on to threads of execution. |
| struct mapping_t |
| { |
| /// The mapping_t property applies to executors, senders, and schedulers. |
| template <typename T> |
| static constexpr bool is_applicable_property_v = |
| is_executor_v<T> || is_sender_v<T> || is_scheduler_v<T>; |
| |
| /// The top-level mapping_t property cannot be required. |
| static constexpr bool is_requirable = false; |
| |
| /// The top-level mapping_t property cannot be preferred. |
| static constexpr bool is_preferable = false; |
| |
| /// The type returned by queries against an @c any_executor. |
| typedef mapping_t polymorphic_query_result_type; |
| |
| /// A sub-property that indicates that execution agents are mapped on to |
| /// threads of execution. |
| struct thread_t |
| { |
| /// The mapping_t::thread_t property applies to executors, senders, and |
| /// schedulers. |
| template <typename T> |
| static constexpr bool is_applicable_property_v = |
| is_executor_v<T> || is_sender_v<T> || is_scheduler_v<T>; |
| |
| /// The mapping_t::thread_t property can be required. |
| static constexpr bool is_requirable = true; |
| |
| /// The mapping_t::thread_t property can be preferred. |
| static constexpr bool is_preferable = true; |
| |
| /// The type returned by queries against an @c any_executor. |
| typedef mapping_t polymorphic_query_result_type; |
| |
| /// Default constructor. |
| constexpr thread_t(); |
| |
| /// Get the value associated with a property object. |
| /** |
| * @returns thread_t(); |
| */ |
| static constexpr mapping_t value(); |
| }; |
| |
| /// A sub-property that indicates that execution agents are mapped on to |
| /// new threads of execution. |
| struct new_thread_t |
| { |
| /// The mapping_t::new_thread_t property applies to executors, senders, and |
| /// schedulers. |
| template <typename T> |
| static constexpr bool is_applicable_property_v = |
| is_executor_v<T> || is_sender_v<T> || is_scheduler_v<T>; |
| |
| /// The mapping_t::new_thread_t property can be required. |
| static constexpr bool is_requirable = true; |
| |
| /// The mapping_t::new_thread_t property can be preferred. |
| static constexpr bool is_preferable = true; |
| |
| /// The type returned by queries against an @c any_executor. |
| typedef mapping_t polymorphic_query_result_type; |
| |
| /// Default constructor. |
| constexpr new_thread_t(); |
| |
| /// Get the value associated with a property object. |
| /** |
| * @returns new_thread_t(); |
| */ |
| static constexpr mapping_t value(); |
| }; |
| |
| /// A sub-property that indicates that the mapping of execution agents is |
| /// implementation-defined. |
| struct other_t |
| { |
| /// The mapping_t::other_t property applies to executors, senders, and |
| /// schedulers. |
| template <typename T> |
| static constexpr bool is_applicable_property_v = |
| is_executor_v<T> || is_sender_v<T> || is_scheduler_v<T>; |
| |
| /// The mapping_t::other_t property can be required. |
| static constexpr bool is_requirable = true; |
| |
| /// The mapping_t::other_t property can be preferred. |
| static constexpr bool is_preferable = true; |
| |
| /// The type returned by queries against an @c any_executor. |
| typedef mapping_t polymorphic_query_result_type; |
| |
| /// Default constructor. |
| constexpr other_t(); |
| |
| /// Get the value associated with a property object. |
| /** |
| * @returns other_t(); |
| */ |
| static constexpr mapping_t value(); |
| }; |
| |
| /// A special value used for accessing the mapping_t::thread_t property. |
| static constexpr thread_t thread; |
| |
| /// A special value used for accessing the mapping_t::new_thread_t property. |
| static constexpr new_thread_t new_thread; |
| |
| /// A special value used for accessing the mapping_t::other_t property. |
| static constexpr other_t other; |
| |
| /// Default constructor. |
| constexpr mapping_t(); |
| |
| /// Construct from a sub-property value. |
| constexpr mapping_t(thread_t); |
| |
| /// Construct from a sub-property value. |
| constexpr mapping_t(new_thread_t); |
| |
| /// Construct from a sub-property value. |
| constexpr mapping_t(other_t); |
| |
| /// Compare property values for equality. |
| friend constexpr bool operator==( |
| const mapping_t& a, const mapping_t& b) noexcept; |
| |
| /// Compare property values for inequality. |
| friend constexpr bool operator!=( |
| const mapping_t& a, const mapping_t& b) noexcept; |
| }; |
| |
| /// A special value used for accessing the mapping_t property. |
| constexpr mapping_t mapping; |
| |
| } // namespace execution |
| |
| #else // defined(GENERATING_DOCUMENTATION) |
| |
| namespace execution { |
| namespace detail { |
| namespace mapping { |
| |
| template <int I> struct thread_t; |
| template <int I> struct new_thread_t; |
| template <int I> struct other_t; |
| |
| } // namespace mapping |
| |
| template <int I = 0> |
| struct mapping_t |
| { |
| #if defined(BOOST_ASIO_HAS_VARIABLE_TEMPLATES) |
| template <typename T> |
| BOOST_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(BOOST_ASIO_HAS_VARIABLE_TEMPLATES) |
| |
| BOOST_ASIO_STATIC_CONSTEXPR(bool, is_requirable = false); |
| BOOST_ASIO_STATIC_CONSTEXPR(bool, is_preferable = false); |
| typedef mapping_t polymorphic_query_result_type; |
| |
| typedef detail::mapping::thread_t<I> thread_t; |
| typedef detail::mapping::new_thread_t<I> new_thread_t; |
| typedef detail::mapping::other_t<I> other_t; |
| |
| BOOST_ASIO_CONSTEXPR mapping_t() |
| : value_(-1) |
| { |
| } |
| |
| BOOST_ASIO_CONSTEXPR mapping_t(thread_t) |
| : value_(0) |
| { |
| } |
| |
| BOOST_ASIO_CONSTEXPR mapping_t(new_thread_t) |
| : value_(1) |
| { |
| } |
| |
| BOOST_ASIO_CONSTEXPR mapping_t(other_t) |
| : value_(2) |
| { |
| } |
| |
| template <typename T> |
| struct proxy |
| { |
| #if defined(BOOST_ASIO_HAS_DEDUCED_QUERY_MEMBER_TRAIT) |
| struct type |
| { |
| template <typename P> |
| auto query(BOOST_ASIO_MOVE_ARG(P) p) const |
| noexcept( |
| noexcept( |
| declval<typename conditional<true, T, P>::type>().query( |
| BOOST_ASIO_MOVE_CAST(P)(p)) |
| ) |
| ) |
| -> decltype( |
| declval<typename conditional<true, T, P>::type>().query( |
| BOOST_ASIO_MOVE_CAST(P)(p)) |
| ); |
| }; |
| #else // defined(BOOST_ASIO_HAS_DEDUCED_QUERY_MEMBER_TRAIT) |
| typedef T type; |
| #endif // defined(BOOST_ASIO_HAS_DEDUCED_QUERY_MEMBER_TRAIT) |
| }; |
| |
| template <typename T> |
| struct static_proxy |
| { |
| #if defined(BOOST_ASIO_HAS_DEDUCED_QUERY_STATIC_CONSTEXPR_MEMBER_TRAIT) |
| struct type |
| { |
| template <typename P> |
| static constexpr auto query(BOOST_ASIO_MOVE_ARG(P) p) |
| noexcept( |
| noexcept( |
| conditional<true, T, P>::type::query(BOOST_ASIO_MOVE_CAST(P)(p)) |
| ) |
| ) |
| -> decltype( |
| conditional<true, T, P>::type::query(BOOST_ASIO_MOVE_CAST(P)(p)) |
| ) |
| { |
| return T::query(BOOST_ASIO_MOVE_CAST(P)(p)); |
| } |
| }; |
| #else // defined(BOOST_ASIO_HAS_DEDUCED_QUERY_STATIC_CONSTEXPR_MEMBER_TRAIT) |
| typedef T type; |
| #endif // defined(BOOST_ASIO_HAS_DEDUCED_QUERY_STATIC_CONSTEXPR_MEMBER_TRAIT) |
| }; |
| |
| template <typename T> |
| struct query_member : |
| traits::query_member<typename proxy<T>::type, mapping_t> {}; |
| |
| template <typename T> |
| struct query_static_constexpr_member : |
| traits::query_static_constexpr_member< |
| typename static_proxy<T>::type, mapping_t> {}; |
| |
| #if defined(BOOST_ASIO_HAS_DEDUCED_STATIC_QUERY_TRAIT) \ |
| && defined(BOOST_ASIO_HAS_SFINAE_VARIABLE_TEMPLATES) |
| template <typename T> |
| static BOOST_ASIO_CONSTEXPR |
| typename query_static_constexpr_member<T>::result_type |
| static_query() |
| BOOST_ASIO_NOEXCEPT_IF(( |
| query_static_constexpr_member<T>::is_noexcept)) |
| { |
| return query_static_constexpr_member<T>::value(); |
| } |
| |
| template <typename T> |
| static BOOST_ASIO_CONSTEXPR |
| typename traits::static_query<T, thread_t>::result_type |
| static_query( |
| typename enable_if< |
| !query_static_constexpr_member<T>::is_valid |
| >::type* = 0, |
| typename enable_if< |
| !query_member<T>::is_valid |
| >::type* = 0, |
| typename enable_if< |
| traits::static_query<T, thread_t>::is_valid |
| >::type* = 0) BOOST_ASIO_NOEXCEPT |
| { |
| return traits::static_query<T, thread_t>::value(); |
| } |
| |
| template <typename T> |
| static BOOST_ASIO_CONSTEXPR |
| typename traits::static_query<T, new_thread_t>::result_type |
| static_query( |
| typename enable_if< |
| !query_static_constexpr_member<T>::is_valid |
| >::type* = 0, |
| typename enable_if< |
| !query_member<T>::is_valid |
| >::type* = 0, |
| typename enable_if< |
| !traits::static_query<T, thread_t>::is_valid |
| >::type* = 0, |
| typename enable_if< |
| traits::static_query<T, new_thread_t>::is_valid |
| >::type* = 0) BOOST_ASIO_NOEXCEPT |
| { |
| return traits::static_query<T, new_thread_t>::value(); |
| } |
| |
| template <typename T> |
| static BOOST_ASIO_CONSTEXPR |
| typename traits::static_query<T, other_t>::result_type |
| static_query( |
| typename enable_if< |
| !query_static_constexpr_member<T>::is_valid |
| >::type* = 0, |
| typename enable_if< |
| !query_member<T>::is_valid |
| >::type* = 0, |
| typename enable_if< |
| !traits::static_query<T, thread_t>::is_valid |
| >::type* = 0, |
| typename enable_if< |
| !traits::static_query<T, new_thread_t>::is_valid |
| >::type* = 0, |
| typename enable_if< |
| traits::static_query<T, other_t>::is_valid |
| >::type* = 0) BOOST_ASIO_NOEXCEPT |
| { |
| return traits::static_query<T, other_t>::value(); |
| } |
| |
| template <typename E, typename T = decltype(mapping_t::static_query<E>())> |
| static BOOST_ASIO_CONSTEXPR const T static_query_v |
| = mapping_t::static_query<E>(); |
| #endif // defined(BOOST_ASIO_HAS_DEDUCED_STATIC_QUERY_TRAIT) |
| // && defined(BOOST_ASIO_HAS_SFINAE_VARIABLE_TEMPLATES) |
| |
| friend BOOST_ASIO_CONSTEXPR bool operator==( |
| const mapping_t& a, const mapping_t& b) |
| { |
| return a.value_ == b.value_; |
| } |
| |
| friend BOOST_ASIO_CONSTEXPR bool operator!=( |
| const mapping_t& a, const mapping_t& b) |
| { |
| return a.value_ != b.value_; |
| } |
| |
| struct convertible_from_mapping_t |
| { |
| BOOST_ASIO_CONSTEXPR convertible_from_mapping_t(mapping_t) {} |
| }; |
| |
| template <typename Executor> |
| friend BOOST_ASIO_CONSTEXPR mapping_t query( |
| const Executor& ex, convertible_from_mapping_t, |
| typename enable_if< |
| can_query<const Executor&, thread_t>::value |
| >::type* = 0) |
| #if !defined(__clang__) // Clang crashes if noexcept is used here. |
| #if defined(BOOST_ASIO_MSVC) // Visual C++ wants the type to be qualified. |
| BOOST_ASIO_NOEXCEPT_IF(( |
| is_nothrow_query<const Executor&, mapping_t<>::thread_t>::value)) |
| #else // defined(BOOST_ASIO_MSVC) |
| BOOST_ASIO_NOEXCEPT_IF(( |
| is_nothrow_query<const Executor&, thread_t>::value)) |
| #endif // defined(BOOST_ASIO_MSVC) |
| #endif // !defined(__clang__) |
| { |
| return boost::asio::query(ex, thread_t()); |
| } |
| |
| template <typename Executor> |
| friend BOOST_ASIO_CONSTEXPR mapping_t query( |
| const Executor& ex, convertible_from_mapping_t, |
| typename enable_if< |
| !can_query<const Executor&, thread_t>::value |
| >::type* = 0, |
| typename enable_if< |
| can_query<const Executor&, new_thread_t>::value |
| >::type* = 0) |
| #if !defined(__clang__) // Clang crashes if noexcept is used here. |
| #if defined(BOOST_ASIO_MSVC) // Visual C++ wants the type to be qualified. |
| BOOST_ASIO_NOEXCEPT_IF(( |
| is_nothrow_query<const Executor&, mapping_t<>::new_thread_t>::value)) |
| #else // defined(BOOST_ASIO_MSVC) |
| BOOST_ASIO_NOEXCEPT_IF(( |
| is_nothrow_query<const Executor&, new_thread_t>::value)) |
| #endif // defined(BOOST_ASIO_MSVC) |
| #endif // !defined(__clang__) |
| { |
| return boost::asio::query(ex, new_thread_t()); |
| } |
| |
| template <typename Executor> |
| friend BOOST_ASIO_CONSTEXPR mapping_t query( |
| const Executor& ex, convertible_from_mapping_t, |
| typename enable_if< |
| !can_query<const Executor&, thread_t>::value |
| >::type* = 0, |
| typename enable_if< |
| !can_query<const Executor&, new_thread_t>::value |
| >::type* = 0, |
| typename enable_if< |
| can_query<const Executor&, other_t>::value |
| >::type* = 0) |
| #if !defined(__clang__) // Clang crashes if noexcept is used here. |
| #if defined(BOOST_ASIO_MSVC) // Visual C++ wants the type to be qualified. |
| BOOST_ASIO_NOEXCEPT_IF(( |
| is_nothrow_query<const Executor&, mapping_t<>::other_t>::value)) |
| #else // defined(BOOST_ASIO_MSVC) |
| BOOST_ASIO_NOEXCEPT_IF(( |
| is_nothrow_query<const Executor&, other_t>::value)) |
| #endif // defined(BOOST_ASIO_MSVC) |
| #endif // !defined(__clang__) |
| { |
| return boost::asio::query(ex, other_t()); |
| } |
| |
| BOOST_ASIO_STATIC_CONSTEXPR_DEFAULT_INIT(thread_t, thread); |
| BOOST_ASIO_STATIC_CONSTEXPR_DEFAULT_INIT(new_thread_t, new_thread); |
| BOOST_ASIO_STATIC_CONSTEXPR_DEFAULT_INIT(other_t, other); |
| |
| #if !defined(BOOST_ASIO_HAS_CONSTEXPR) |
| static const mapping_t instance; |
| #endif // !defined(BOOST_ASIO_HAS_CONSTEXPR) |
| |
| private: |
| int value_; |
| }; |
| |
| #if defined(BOOST_ASIO_HAS_DEDUCED_STATIC_QUERY_TRAIT) \ |
| && defined(BOOST_ASIO_HAS_SFINAE_VARIABLE_TEMPLATES) |
| template <int I> template <typename E, typename T> |
| const T mapping_t<I>::static_query_v; |
| #endif // defined(BOOST_ASIO_HAS_DEDUCED_STATIC_QUERY_TRAIT) |
| // && defined(BOOST_ASIO_HAS_SFINAE_VARIABLE_TEMPLATES) |
| |
| #if !defined(BOOST_ASIO_HAS_CONSTEXPR) |
| template <int I> |
| const mapping_t<I> mapping_t<I>::instance; |
| #endif |
| |
| template <int I> |
| const typename mapping_t<I>::thread_t mapping_t<I>::thread; |
| |
| template <int I> |
| const typename mapping_t<I>::new_thread_t mapping_t<I>::new_thread; |
| |
| template <int I> |
| const typename mapping_t<I>::other_t mapping_t<I>::other; |
| |
| namespace mapping { |
| |
| template <int I = 0> |
| struct thread_t |
| { |
| #if defined(BOOST_ASIO_HAS_VARIABLE_TEMPLATES) |
| template <typename T> |
| BOOST_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(BOOST_ASIO_HAS_VARIABLE_TEMPLATES) |
| |
| BOOST_ASIO_STATIC_CONSTEXPR(bool, is_requirable = true); |
| BOOST_ASIO_STATIC_CONSTEXPR(bool, is_preferable = true); |
| typedef mapping_t<I> polymorphic_query_result_type; |
| |
| BOOST_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(BOOST_ASIO_HAS_DEDUCED_STATIC_QUERY_TRAIT) \ |
| && defined(BOOST_ASIO_HAS_SFINAE_VARIABLE_TEMPLATES) |
| template <typename T> |
| static BOOST_ASIO_CONSTEXPR |
| typename query_static_constexpr_member<T>::result_type |
| static_query() |
| BOOST_ASIO_NOEXCEPT_IF(( |
| query_static_constexpr_member<T>::is_noexcept)) |
| { |
| return query_static_constexpr_member<T>::value(); |
| } |
| |
| template <typename T> |
| static BOOST_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) BOOST_ASIO_NOEXCEPT |
| { |
| return thread_t(); |
| } |
| |
| template <typename E, typename T = decltype(thread_t::static_query<E>())> |
| static BOOST_ASIO_CONSTEXPR const T static_query_v |
| = thread_t::static_query<E>(); |
| #endif // defined(BOOST_ASIO_HAS_DEDUCED_STATIC_QUERY_TRAIT) |
| // && defined(BOOST_ASIO_HAS_SFINAE_VARIABLE_TEMPLATES) |
| |
| static BOOST_ASIO_CONSTEXPR mapping_t<I> value() |
| { |
| return thread_t(); |
| } |
| |
| friend BOOST_ASIO_CONSTEXPR bool operator==( |
| const thread_t&, const thread_t&) |
| { |
| return true; |
| } |
| |
| friend BOOST_ASIO_CONSTEXPR bool operator!=( |
| const thread_t&, const thread_t&) |
| { |
| return false; |
| } |
| }; |
| |
| #if defined(BOOST_ASIO_HAS_DEDUCED_STATIC_QUERY_TRAIT) \ |
| && defined(BOOST_ASIO_HAS_SFINAE_VARIABLE_TEMPLATES) |
| template <int I> template <typename E, typename T> |
| const T thread_t<I>::static_query_v; |
| #endif // defined(BOOST_ASIO_HAS_DEDUCED_STATIC_QUERY_TRAIT) |
| // && defined(BOOST_ASIO_HAS_SFINAE_VARIABLE_TEMPLATES) |
| |
| template <int I = 0> |
| struct new_thread_t |
| { |
| #if defined(BOOST_ASIO_HAS_VARIABLE_TEMPLATES) |
| template <typename T> |
| BOOST_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(BOOST_ASIO_HAS_VARIABLE_TEMPLATES) |
| |
| BOOST_ASIO_STATIC_CONSTEXPR(bool, is_requirable = true); |
| BOOST_ASIO_STATIC_CONSTEXPR(bool, is_preferable = true); |
| typedef mapping_t<I> polymorphic_query_result_type; |
| |
| BOOST_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(BOOST_ASIO_HAS_DEDUCED_STATIC_QUERY_TRAIT) \ |
| && defined(BOOST_ASIO_HAS_SFINAE_VARIABLE_TEMPLATES) |
| template <typename T> |
| static BOOST_ASIO_CONSTEXPR |
| typename query_static_constexpr_member<T>::result_type |
| static_query() |
| BOOST_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 BOOST_ASIO_CONSTEXPR const T static_query_v |
| = new_thread_t::static_query<E>(); |
| #endif // defined(BOOST_ASIO_HAS_DEDUCED_STATIC_QUERY_TRAIT) |
| // && defined(BOOST_ASIO_HAS_SFINAE_VARIABLE_TEMPLATES) |
| |
| static BOOST_ASIO_CONSTEXPR mapping_t<I> value() |
| { |
| return new_thread_t(); |
| } |
| |
| friend BOOST_ASIO_CONSTEXPR bool operator==( |
| const new_thread_t&, const new_thread_t&) |
| { |
| return true; |
| } |
| |
| friend BOOST_ASIO_CONSTEXPR bool operator!=( |
| const new_thread_t&, const new_thread_t&) |
| { |
| return false; |
| } |
| }; |
| |
| #if defined(BOOST_ASIO_HAS_DEDUCED_STATIC_QUERY_TRAIT) \ |
| && defined(BOOST_ASIO_HAS_SFINAE_VARIABLE_TEMPLATES) |
| template <int I> template <typename E, typename T> |
| const T new_thread_t<I>::static_query_v; |
| #endif // defined(BOOST_ASIO_HAS_DEDUCED_STATIC_QUERY_TRAIT) |
| // && defined(BOOST_ASIO_HAS_SFINAE_VARIABLE_TEMPLATES) |
| |
| template <int I> |
| struct other_t |
| { |
| #if defined(BOOST_ASIO_HAS_VARIABLE_TEMPLATES) |
| template <typename T> |
| BOOST_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(BOOST_ASIO_HAS_VARIABLE_TEMPLATES) |
| |
| BOOST_ASIO_STATIC_CONSTEXPR(bool, is_requirable = true); |
| BOOST_ASIO_STATIC_CONSTEXPR(bool, is_preferable = true); |
| typedef mapping_t<I> polymorphic_query_result_type; |
| |
| BOOST_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(BOOST_ASIO_HAS_DEDUCED_STATIC_QUERY_TRAIT) \ |
| && defined(BOOST_ASIO_HAS_SFINAE_VARIABLE_TEMPLATES) |
| template <typename T> |
| static BOOST_ASIO_CONSTEXPR |
| typename query_static_constexpr_member<T>::result_type |
| static_query() |
| BOOST_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 BOOST_ASIO_CONSTEXPR const T static_query_v |
| = other_t::static_query<E>(); |
| #endif // defined(BOOST_ASIO_HAS_DEDUCED_STATIC_QUERY_TRAIT) |
| // && defined(BOOST_ASIO_HAS_SFINAE_VARIABLE_TEMPLATES) |
| |
| static BOOST_ASIO_CONSTEXPR mapping_t<I> value() |
| { |
| return other_t(); |
| } |
| |
| friend BOOST_ASIO_CONSTEXPR bool operator==( |
| const other_t&, const other_t&) |
| { |
| return true; |
| } |
| |
| friend BOOST_ASIO_CONSTEXPR bool operator!=( |
| const other_t&, const other_t&) |
| { |
| return false; |
| } |
| }; |
| |
| #if defined(BOOST_ASIO_HAS_DEDUCED_STATIC_QUERY_TRAIT) \ |
| && defined(BOOST_ASIO_HAS_SFINAE_VARIABLE_TEMPLATES) |
| template <int I> template <typename E, typename T> |
| const T other_t<I>::static_query_v; |
| #endif // defined(BOOST_ASIO_HAS_DEDUCED_STATIC_QUERY_TRAIT) |
| // && defined(BOOST_ASIO_HAS_SFINAE_VARIABLE_TEMPLATES) |
| |
| } // namespace mapping |
| } // namespace detail |
| |
| typedef detail::mapping_t<> mapping_t; |
| |
| #if defined(BOOST_ASIO_HAS_CONSTEXPR) || defined(GENERATING_DOCUMENTATION) |
| constexpr mapping_t mapping; |
| #else // defined(BOOST_ASIO_HAS_CONSTEXPR) || defined(GENERATING_DOCUMENTATION) |
| namespace { static const mapping_t& mapping = mapping_t::instance; } |
| #endif |
| |
| } // namespace execution |
| |
| #if !defined(BOOST_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(BOOST_ASIO_HAS_VARIABLE_TEMPLATES) |
| |
| namespace traits { |
| |
| #if !defined(BOOST_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> |
| { |
| BOOST_ASIO_STATIC_CONSTEXPR(bool, is_valid = true); |
| BOOST_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> |
| { |
| BOOST_ASIO_STATIC_CONSTEXPR(bool, is_valid = true); |
| BOOST_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> |
| { |
| BOOST_ASIO_STATIC_CONSTEXPR(bool, is_valid = true); |
| BOOST_ASIO_STATIC_CONSTEXPR(bool, is_noexcept = |
| (is_nothrow_query<T, execution::mapping_t::other_t>::value)); |
| |
| typedef execution::mapping_t result_type; |
| }; |
| |
| #endif // !defined(BOOST_ASIO_HAS_DEDUCED_QUERY_FREE_TRAIT) |
| |
| #if !defined(BOOST_ASIO_HAS_DEDUCED_STATIC_QUERY_TRAIT) \ |
| || !defined(BOOST_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> |
| { |
| BOOST_ASIO_STATIC_CONSTEXPR(bool, is_valid = true); |
| BOOST_ASIO_STATIC_CONSTEXPR(bool, is_noexcept = true); |
| |
| typedef typename execution::detail::mapping_t<0>:: |
| query_static_constexpr_member<T>::result_type result_type; |
| |
| static BOOST_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> |
| { |
| BOOST_ASIO_STATIC_CONSTEXPR(bool, is_valid = true); |
| BOOST_ASIO_STATIC_CONSTEXPR(bool, is_noexcept = true); |
| |
| typedef typename traits::static_query<T, |
| execution::mapping_t::thread_t>::result_type result_type; |
| |
| static BOOST_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> |
| { |
| BOOST_ASIO_STATIC_CONSTEXPR(bool, is_valid = true); |
| BOOST_ASIO_STATIC_CONSTEXPR(bool, is_noexcept = true); |
| |
| typedef typename traits::static_query<T, |
| execution::mapping_t::new_thread_t>::result_type result_type; |
| |
| static BOOST_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> |
| { |
| BOOST_ASIO_STATIC_CONSTEXPR(bool, is_valid = true); |
| BOOST_ASIO_STATIC_CONSTEXPR(bool, is_noexcept = true); |
| |
| typedef typename traits::static_query<T, |
| execution::mapping_t::other_t>::result_type result_type; |
| |
| static BOOST_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> |
| { |
| BOOST_ASIO_STATIC_CONSTEXPR(bool, is_valid = true); |
| BOOST_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 BOOST_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> |
| { |
| BOOST_ASIO_STATIC_CONSTEXPR(bool, is_valid = true); |
| BOOST_ASIO_STATIC_CONSTEXPR(bool, is_noexcept = true); |
| |
| typedef execution::mapping_t::thread_t result_type; |
| |
| static BOOST_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> |
| { |
| BOOST_ASIO_STATIC_CONSTEXPR(bool, is_valid = true); |
| BOOST_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 BOOST_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> |
| { |
| BOOST_ASIO_STATIC_CONSTEXPR(bool, is_valid = true); |
| BOOST_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 BOOST_ASIO_CONSTEXPR result_type value() |
| { |
| return execution::detail::mapping::other_t<0>:: |
| query_static_constexpr_member<T>::value(); |
| } |
| }; |
| |
| #endif // !defined(BOOST_ASIO_HAS_DEDUCED_STATIC_QUERY_TRAIT) |
| // || !defined(BOOST_ASIO_HAS_SFINAE_VARIABLE_TEMPLATES) |
| |
| #if !defined(BOOST_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> |
| { |
| BOOST_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> |
| { |
| BOOST_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> |
| { |
| BOOST_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(BOOST_ASIO_HAS_DEDUCED_STATIC_REQUIRE_TRAIT) |
| |
| } // namespace traits |
| |
| #endif // defined(GENERATING_DOCUMENTATION) |
| |
| } // namespace asio |
| } // namespace boost |
| |
| #include <boost/asio/detail/pop_options.hpp> |
| |
| #endif // BOOST_ASIO_EXECUTION_MAPPING_HPP |
