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+//
+// execution/occupancy.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 ASIO_EXECUTION_OCCUPANCY_HPP
+#define ASIO_EXECUTION_OCCUPANCY_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/config.hpp"
+#include "asio/detail/type_traits.hpp"
+#include "asio/execution/executor.hpp"
+#include "asio/execution/scheduler.hpp"
+#include "asio/execution/sender.hpp"
+#include "asio/is_applicable_property.hpp"
+#include "asio/traits/query_static_constexpr_member.hpp"
+#include "asio/traits/static_query.hpp"
+
+#include "asio/detail/push_options.hpp"
+
+namespace asio {
+
+#if defined(GENERATING_DOCUMENTATION)
+
+namespace execution {
+
+/// A property that gives an estimate of the number of execution agents that
+/// should occupy the associated execution context.
+struct occupancy_t
+{
+ /// The occupancy_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 occupancy_t property cannot be required.
+ static constexpr bool is_requirable = false;
+
+ /// The occupancy_t property cannot be preferred.
+ static constexpr bool is_preferable = false;
+
+ /// The type returned by queries against an @c any_executor.
+ typedef std::size_t polymorphic_query_result_type;
+};
+
+/// A special value used for accessing the occupancy_t property.
+constexpr occupancy_t occupancy;
+
+} // namespace execution
+
+#else // defined(GENERATING_DOCUMENTATION)
+
+namespace execution {
+namespace detail {
+
+template <int I = 0>
+struct occupancy_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 = false);
+ ASIO_STATIC_CONSTEXPR(bool, is_preferable = false);
+ typedef std::size_t polymorphic_query_result_type;
+
+ ASIO_CONSTEXPR occupancy_t()
+ {
+ }
+
+ template <typename T>
+ struct static_proxy
+ {
+#if defined(ASIO_HAS_DEDUCED_QUERY_STATIC_CONSTEXPR_MEMBER_TRAIT)
+ struct type
+ {
+ template <typename P>
+ static constexpr auto query(ASIO_MOVE_ARG(P) p)
+ noexcept(
+ noexcept(
+ conditional<true, T, P>::type::query(ASIO_MOVE_CAST(P)(p))
+ )
+ )
+ -> decltype(
+ conditional<true, T, P>::type::query(ASIO_MOVE_CAST(P)(p))
+ )
+ {
+ return T::query(ASIO_MOVE_CAST(P)(p));
+ }
+ };
+#else // defined(ASIO_HAS_DEDUCED_QUERY_STATIC_CONSTEXPR_MEMBER_TRAIT)
+ typedef T type;
+#endif // defined(ASIO_HAS_DEDUCED_QUERY_STATIC_CONSTEXPR_MEMBER_TRAIT)
+ };
+
+ template <typename T>
+ struct query_static_constexpr_member :
+ traits::query_static_constexpr_member<
+ typename static_proxy<T>::type, occupancy_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(occupancy_t::static_query<E>())>
+ static ASIO_CONSTEXPR const T static_query_v
+ = occupancy_t::static_query<E>();
+#endif // defined(ASIO_HAS_DEDUCED_STATIC_QUERY_TRAIT)
+ // && defined(ASIO_HAS_SFINAE_VARIABLE_TEMPLATES)
+
+#if !defined(ASIO_HAS_CONSTEXPR)
+ static const occupancy_t instance;
+#endif // !defined(ASIO_HAS_CONSTEXPR)
+};
+
+#if defined(ASIO_HAS_DEDUCED_STATIC_QUERY_TRAIT) \
+ && defined(ASIO_HAS_SFINAE_VARIABLE_TEMPLATES)
+template <int I> template <typename E, typename T>
+const T occupancy_t<I>::static_query_v;
+#endif // defined(ASIO_HAS_DEDUCED_STATIC_QUERY_TRAIT)
+ // && defined(ASIO_HAS_SFINAE_VARIABLE_TEMPLATES)
+
+#if !defined(ASIO_HAS_CONSTEXPR)
+template <int I>
+const occupancy_t<I> occupancy_t<I>::instance;
+#endif
+
+} // namespace detail
+
+typedef detail::occupancy_t<> occupancy_t;
+
+#if defined(ASIO_HAS_CONSTEXPR) || defined(GENERATING_DOCUMENTATION)
+constexpr occupancy_t occupancy;
+#else // defined(ASIO_HAS_CONSTEXPR) || defined(GENERATING_DOCUMENTATION)
+namespace { static const occupancy_t& occupancy = occupancy_t::instance; }
+#endif
+
+} // namespace execution
+
+#if !defined(ASIO_HAS_VARIABLE_TEMPLATES)
+
+template <typename T>
+struct is_applicable_property<T, execution::occupancy_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_STATIC_QUERY_TRAIT) \
+ || !defined(ASIO_HAS_SFINAE_VARIABLE_TEMPLATES)
+
+template <typename T>
+struct static_query<T, execution::occupancy_t,
+ typename enable_if<
+ execution::detail::occupancy_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::occupancy_t<0>::
+ query_static_constexpr_member<T>::result_type result_type;
+
+ static ASIO_CONSTEXPR result_type value()
+ {
+ return execution::detail::occupancy_t<0>::
+ query_static_constexpr_member<T>::value();
+ }
+};
+
+#endif // !defined(ASIO_HAS_DEDUCED_STATIC_QUERY_TRAIT)
+ // || !defined(ASIO_HAS_SFINAE_VARIABLE_TEMPLATES)
+
+} // namespace traits
+
+#endif // defined(GENERATING_DOCUMENTATION)
+
+} // namespace asio
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_EXECUTION_OCCUPANCY_HPP