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+//
+// execution/context_as.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_CONTEXT_AS_HPP
+#define ASIO_EXECUTION_CONTEXT_AS_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/context.hpp"
+#include "asio/execution/executor.hpp"
+#include "asio/execution/scheduler.hpp"
+#include "asio/execution/sender.hpp"
+#include "asio/is_applicable_property.hpp"
+#include "asio/query.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 is used to obtain the execution context that is associated
+/// with an executor.
+template <typename U>
+struct context_as_t
+{
+ /// The context_as_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 context_t property cannot be required.
+ static constexpr bool is_requirable = false;
+
+ /// The context_t property cannot be preferred.
+ static constexpr bool is_preferable = false;
+
+ /// The type returned by queries against an @c any_executor.
+ typedef T polymorphic_query_result_type;
+};
+
+/// A special value used for accessing the context_as_t property.
+template <typename U>
+constexpr context_as_t context_as;
+
+} // namespace execution
+
+#else // defined(GENERATING_DOCUMENTATION)
+
+namespace execution {
+
+template <typename T>
+struct context_as_t
+{
+#if defined(ASIO_HAS_VARIABLE_TEMPLATES)
+ template <typename U>
+ ASIO_STATIC_CONSTEXPR(bool,
+ is_applicable_property_v = (
+ is_executor<U>::value
+ || conditional<
+ is_executor<U>::value,
+ false_type,
+ is_sender<U>
+ >::type::value
+ || conditional<
+ is_executor<U>::value,
+ false_type,
+ is_scheduler<U>
+ >::type::value));
+#endif // defined(ASIO_HAS_VARIABLE_TEMPLATES)
+
+ ASIO_STATIC_CONSTEXPR(bool, is_requirable = false);
+ ASIO_STATIC_CONSTEXPR(bool, is_preferable = false);
+
+ typedef T polymorphic_query_result_type;
+
+ ASIO_CONSTEXPR context_as_t()
+ {
+ }
+
+ ASIO_CONSTEXPR context_as_t(context_t)
+ {
+ }
+
+#if defined(ASIO_HAS_DEDUCED_STATIC_QUERY_TRAIT) \
+ && defined(ASIO_HAS_SFINAE_VARIABLE_TEMPLATES)
+ template <typename E>
+ static ASIO_CONSTEXPR
+ typename context_t::query_static_constexpr_member<E>::result_type
+ static_query()
+ ASIO_NOEXCEPT_IF((
+ context_t::query_static_constexpr_member<E>::is_noexcept))
+ {
+ return context_t::query_static_constexpr_member<E>::value();
+ }
+
+ template <typename E, typename U = decltype(context_as_t::static_query<E>())>
+ static ASIO_CONSTEXPR const U static_query_v
+ = context_as_t::static_query<E>();
+#endif // defined(ASIO_HAS_DEDUCED_STATIC_QUERY_TRAIT)
+ // && defined(ASIO_HAS_SFINAE_VARIABLE_TEMPLATES)
+
+ template <typename Executor, typename U>
+ friend ASIO_CONSTEXPR U query(
+ const Executor& ex, const context_as_t<U>&,
+ typename enable_if<
+ is_same<T, U>::value
+ >::type* = 0,
+ typename enable_if<
+ can_query<const Executor&, const context_t&>::value
+ >::type* = 0)
+#if !defined(__clang__) // Clang crashes if noexcept is used here.
+#if defined(ASIO_MSVC) // Visual C++ wants the type to be qualified.
+ ASIO_NOEXCEPT_IF((
+ is_nothrow_query<const Executor&, const context_t&>::value))
+#else // defined(ASIO_MSVC)
+ ASIO_NOEXCEPT_IF((
+ is_nothrow_query<const Executor&, const context_t&>::value))
+#endif // defined(ASIO_MSVC)
+#endif // !defined(__clang__)
+ {
+ return asio::query(ex, context);
+ }
+};
+
+#if defined(ASIO_HAS_DEDUCED_STATIC_QUERY_TRAIT) \
+ && defined(ASIO_HAS_SFINAE_VARIABLE_TEMPLATES)
+template <typename T> template <typename E, typename U>
+const U context_as_t<T>::static_query_v;
+#endif // defined(ASIO_HAS_DEDUCED_STATIC_QUERY_TRAIT)
+ // && defined(ASIO_HAS_SFINAE_VARIABLE_TEMPLATES)
+
+#if (defined(ASIO_HAS_VARIABLE_TEMPLATES) \
+ && defined(ASIO_HAS_CONSTEXPR)) \
+ || defined(GENERATING_DOCUMENTATION)
+template <typename T>
+constexpr context_as_t<T> context_as{};
+#endif // (defined(ASIO_HAS_VARIABLE_TEMPLATES)
+ // && defined(ASIO_HAS_CONSTEXPR))
+ // || defined(GENERATING_DOCUMENTATION)
+
+} // namespace execution
+
+#if !defined(ASIO_HAS_VARIABLE_TEMPLATES)
+
+template <typename T, typename U>
+struct is_applicable_property<T, execution::context_as_t<U> >
+ : 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, typename U>
+struct static_query<T, execution::context_as_t<U>,
+ typename enable_if<
+ static_query<T, execution::context_t>::is_valid
+ >::type> : static_query<T, execution::context_t>
+{
+};
+
+#endif // !defined(ASIO_HAS_DEDUCED_STATIC_QUERY_TRAIT)
+ // || !defined(ASIO_HAS_SFINAE_VARIABLE_TEMPLATES)
+
+#if !defined(ASIO_HAS_DEDUCED_QUERY_FREE_TRAIT)
+
+template <typename T, typename U>
+struct query_free<T, execution::context_as_t<U>,
+ typename enable_if<
+ can_query<const T&, const execution::context_t&>::value
+ >::type>
+{
+ ASIO_STATIC_CONSTEXPR(bool, is_valid = true);
+ ASIO_STATIC_CONSTEXPR(bool, is_noexcept =
+ (is_nothrow_query<const T&, const execution::context_t&>::value));
+
+ typedef U result_type;
+};
+
+#endif // !defined(ASIO_HAS_DEDUCED_QUERY_FREE_TRAIT)
+
+} // namespace traits
+
+#endif // defined(GENERATING_DOCUMENTATION)
+
+} // namespace asio
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_EXECUTION_CONTEXT_AS_HPP