263 lines
7.2 KiB
C++
263 lines
7.2 KiB
C++
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//
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// execution/executor.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_EXECUTOR_HPP
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#define ASIO_EXECUTION_EXECUTOR_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/invocable_archetype.hpp"
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#include "asio/traits/equality_comparable.hpp"
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#include "asio/traits/execute_member.hpp"
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#if !defined(ASIO_NO_DEPRECATED)
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# include "asio/execution/execute.hpp"
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#endif // !defined(ASIO_NO_DEPRECATED)
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#if defined(ASIO_HAS_DEDUCED_EXECUTE_FREE_TRAIT) \
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&& defined(ASIO_HAS_DEDUCED_EXECUTE_MEMBER_TRAIT) \
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&& defined(ASIO_HAS_DEDUCED_EQUALITY_COMPARABLE_TRAIT)
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# define ASIO_HAS_DEDUCED_EXECUTION_IS_EXECUTOR_TRAIT 1
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#endif // defined(ASIO_HAS_DEDUCED_EXECUTE_FREE_TRAIT)
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// && defined(ASIO_HAS_DEDUCED_EXECUTE_MEMBER_TRAIT)
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// && defined(ASIO_HAS_DEDUCED_EQUALITY_COMPARABLE_TRAIT)
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#include "asio/detail/push_options.hpp"
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namespace asio {
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namespace execution {
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namespace detail {
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template <typename T, typename F,
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typename = void, typename = void, typename = void, typename = void,
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typename = void, typename = void, typename = void, typename = void>
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struct is_executor_of_impl : false_type
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{
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};
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template <typename T, typename F>
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struct is_executor_of_impl<T, F,
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#if defined(ASIO_NO_DEPRECATED)
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typename enable_if<
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traits::execute_member<typename add_const<T>::type, F>::is_valid
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>::type,
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#else // defined(ASIO_NO_DEPRECATED)
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typename enable_if<
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can_execute<typename add_const<T>::type, F>::value
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>::type,
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#endif // defined(ASIO_NO_DEPRECATED)
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typename void_type<
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typename result_of<typename decay<F>::type&()>::type
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>::type,
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typename enable_if<
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is_constructible<typename decay<F>::type, F>::value
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>::type,
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typename enable_if<
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is_move_constructible<typename decay<F>::type>::value
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>::type,
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#if defined(ASIO_HAS_NOEXCEPT)
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typename enable_if<
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is_nothrow_copy_constructible<T>::value
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>::type,
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typename enable_if<
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is_nothrow_destructible<T>::value
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>::type,
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#else // defined(ASIO_HAS_NOEXCEPT)
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typename enable_if<
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is_copy_constructible<T>::value
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>::type,
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typename enable_if<
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is_destructible<T>::value
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>::type,
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#endif // defined(ASIO_HAS_NOEXCEPT)
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typename enable_if<
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traits::equality_comparable<T>::is_valid
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>::type,
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typename enable_if<
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traits::equality_comparable<T>::is_noexcept
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>::type> : true_type
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{
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};
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template <typename T, typename = void>
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struct executor_shape
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{
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typedef std::size_t type;
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};
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template <typename T>
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struct executor_shape<T,
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typename void_type<
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typename T::shape_type
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>::type>
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{
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typedef typename T::shape_type type;
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};
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template <typename T, typename Default, typename = void>
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struct executor_index
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{
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typedef Default type;
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};
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template <typename T, typename Default>
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struct executor_index<T, Default,
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typename void_type<
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typename T::index_type
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>::type>
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{
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typedef typename T::index_type type;
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};
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} // namespace detail
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/// The is_executor trait detects whether a type T satisfies the
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/// execution::executor concept.
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/**
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* Class template @c is_executor is a UnaryTypeTrait that is derived from @c
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* true_type if the type @c T meets the concept definition for an executor,
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* otherwise @c false_type.
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*/
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template <typename T>
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struct is_executor :
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#if defined(GENERATING_DOCUMENTATION)
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integral_constant<bool, automatically_determined>
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#else // defined(GENERATING_DOCUMENTATION)
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detail::is_executor_of_impl<T, invocable_archetype>
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#endif // defined(GENERATING_DOCUMENTATION)
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{
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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_CONSTEXPR const bool is_executor_v = is_executor<T>::value;
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#endif // defined(ASIO_HAS_VARIABLE_TEMPLATES)
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#if defined(ASIO_HAS_CONCEPTS)
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template <typename T>
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ASIO_CONCEPT executor = is_executor<T>::value;
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#define ASIO_EXECUTION_EXECUTOR ::asio::execution::executor
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#else // defined(ASIO_HAS_CONCEPTS)
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#define ASIO_EXECUTION_EXECUTOR typename
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#endif // defined(ASIO_HAS_CONCEPTS)
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/// The is_executor_of trait detects whether a type T satisfies the
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/// execution::executor_of concept for some set of value arguments.
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/**
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* Class template @c is_executor_of is a type trait that is derived from @c
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* true_type if the type @c T meets the concept definition for an executor
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* that is invocable with a function object of type @c F, otherwise @c
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* false_type.
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*/
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template <typename T, typename F>
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struct is_executor_of :
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#if defined(GENERATING_DOCUMENTATION)
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integral_constant<bool, automatically_determined>
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#else // defined(GENERATING_DOCUMENTATION)
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integral_constant<bool,
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is_executor<T>::value && detail::is_executor_of_impl<T, F>::value
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>
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#endif // defined(GENERATING_DOCUMENTATION)
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{
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};
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#if defined(ASIO_HAS_VARIABLE_TEMPLATES)
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template <typename T, typename F>
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ASIO_CONSTEXPR const bool is_executor_of_v =
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is_executor_of<T, F>::value;
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#endif // defined(ASIO_HAS_VARIABLE_TEMPLATES)
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#if defined(ASIO_HAS_CONCEPTS)
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template <typename T, typename F>
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ASIO_CONCEPT executor_of = is_executor_of<T, F>::value;
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#define ASIO_EXECUTION_EXECUTOR_OF(f) \
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::asio::execution::executor_of<f>
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#else // defined(ASIO_HAS_CONCEPTS)
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#define ASIO_EXECUTION_EXECUTOR_OF typename
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#endif // defined(ASIO_HAS_CONCEPTS)
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/// The executor_shape trait detects the type used by an executor to represent
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/// the shape of a bulk operation.
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/**
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* Class template @c executor_shape is a type trait with a nested type alias
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* @c type whose type is @c T::shape_type if @c T::shape_type is valid,
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* otherwise @c std::size_t.
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*/
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template <typename T>
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struct executor_shape
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#if !defined(GENERATING_DOCUMENTATION)
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: detail::executor_shape<T>
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#endif // !defined(GENERATING_DOCUMENTATION)
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{
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#if defined(GENERATING_DOCUMENTATION)
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/// @c T::shape_type if @c T::shape_type is valid, otherwise @c std::size_t.
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typedef automatically_determined type;
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#endif // defined(GENERATING_DOCUMENTATION)
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};
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#if defined(ASIO_HAS_ALIAS_TEMPLATES)
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template <typename T>
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using executor_shape_t = typename executor_shape<T>::type;
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#endif // defined(ASIO_HAS_ALIAS_TEMPLATES)
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/// The executor_index trait detects the type used by an executor to represent
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/// an index within a bulk operation.
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/**
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* Class template @c executor_index is a type trait with a nested type alias
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* @c type whose type is @c T::index_type if @c T::index_type is valid,
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* otherwise @c executor_shape_t<T>.
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*/
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template <typename T>
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struct executor_index
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#if !defined(GENERATING_DOCUMENTATION)
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: detail::executor_index<T, typename executor_shape<T>::type>
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#endif // !defined(GENERATING_DOCUMENTATION)
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{
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#if defined(GENERATING_DOCUMENTATION)
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/// @c T::index_type if @c T::index_type is valid, otherwise
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/// @c executor_shape_t<T>.
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typedef automatically_determined type;
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#endif // defined(GENERATING_DOCUMENTATION)
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};
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#if defined(ASIO_HAS_ALIAS_TEMPLATES)
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template <typename T>
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using executor_index_t = typename executor_index<T>::type;
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#endif // defined(ASIO_HAS_ALIAS_TEMPLATES)
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} // namespace execution
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} // namespace asio
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#include "asio/detail/pop_options.hpp"
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#endif // ASIO_EXECUTION_EXECUTOR_HPP
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