117 lines
3.0 KiB
C++
117 lines
3.0 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) 2003-2024 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_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_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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enable_if_t<
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traits::execute_member<add_const_t<T>, F>::is_valid
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>,
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void_t<
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result_of_t<decay_t<F>&()>
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>,
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enable_if_t<
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is_constructible<decay_t<F>, F>::value
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>,
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enable_if_t<
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is_move_constructible<decay_t<F>>::value
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>,
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enable_if_t<
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is_nothrow_copy_constructible<T>::value
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>,
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enable_if_t<
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is_nothrow_destructible<T>::value
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>,
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enable_if_t<
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traits::equality_comparable<T>::is_valid
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>,
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enable_if_t<
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traits::equality_comparable<T>::is_noexcept
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>> : true_type
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{
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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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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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} // 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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