summaryrefslogtreecommitdiffstatshomepage
path: root/3rdparty/asio/include/asio/execution/outstanding_work.hpp
diff options
context:
space:
mode:
Diffstat (limited to '3rdparty/asio/include/asio/execution/outstanding_work.hpp')
-rw-r--r--3rdparty/asio/include/asio/execution/outstanding_work.hpp753
1 files changed, 753 insertions, 0 deletions
diff --git a/3rdparty/asio/include/asio/execution/outstanding_work.hpp b/3rdparty/asio/include/asio/execution/outstanding_work.hpp
new file mode 100644
index 00000000000..600792b95b4
--- /dev/null
+++ b/3rdparty/asio/include/asio/execution/outstanding_work.hpp
@@ -0,0 +1,753 @@
+//
+// execution/outstanding_work.hpp
+// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2024 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_OUTSTANDING_WORK_HPP
+#define ASIO_EXECUTION_OUTSTANDING_WORK_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/is_applicable_property.hpp"
+#include "asio/query.hpp"
+#include "asio/traits/query_free.hpp"
+#include "asio/traits/query_member.hpp"
+#include "asio/traits/query_static_constexpr_member.hpp"
+#include "asio/traits/static_query.hpp"
+#include "asio/traits/static_require.hpp"
+
+#include "asio/detail/push_options.hpp"
+
+namespace asio {
+
+#if defined(GENERATING_DOCUMENTATION)
+
+namespace execution {
+
+/// A property to describe whether task submission is likely in the future.
+struct outstanding_work_t
+{
+ /// The outstanding_work_t property applies to executors.
+ template <typename T>
+ static constexpr bool is_applicable_property_v = is_executor_v<T>;
+
+ /// The top-level outstanding_work_t property cannot be required.
+ static constexpr bool is_requirable = false;
+
+ /// The top-level outstanding_work_t property cannot be preferred.
+ static constexpr bool is_preferable = false;
+
+ /// The type returned by queries against an @c any_executor.
+ typedef outstanding_work_t polymorphic_query_result_type;
+
+ /// A sub-property that indicates that the executor does not represent likely
+ /// future submission of a function object.
+ struct untracked_t
+ {
+ /// The outstanding_work_t::untracked_t property applies to executors.
+ template <typename T>
+ static constexpr bool is_applicable_property_v = is_executor_v<T>;
+
+ /// The outstanding_work_t::untracked_t property can be required.
+ static constexpr bool is_requirable = true;
+
+ /// The outstanding_work_t::untracked_t property can be preferred.
+ static constexpr bool is_preferable = true;
+
+ /// The type returned by queries against an @c any_executor.
+ typedef outstanding_work_t polymorphic_query_result_type;
+
+ /// Default constructor.
+ constexpr untracked_t();
+
+ /// Get the value associated with a property object.
+ /**
+ * @returns untracked_t();
+ */
+ static constexpr outstanding_work_t value();
+ };
+
+ /// A sub-property that indicates that the executor represents likely
+ /// future submission of a function object.
+ struct tracked_t
+ {
+ /// The outstanding_work_t::untracked_t property applies to executors.
+ template <typename T>
+ static constexpr bool is_applicable_property_v = is_executor_v<T>;
+
+ /// The outstanding_work_t::tracked_t property can be required.
+ static constexpr bool is_requirable = true;
+
+ /// The outstanding_work_t::tracked_t property can be preferred.
+ static constexpr bool is_preferable = true;
+
+ /// The type returned by queries against an @c any_executor.
+ typedef outstanding_work_t polymorphic_query_result_type;
+
+ /// Default constructor.
+ constexpr tracked_t();
+
+ /// Get the value associated with a property object.
+ /**
+ * @returns tracked_t();
+ */
+ static constexpr outstanding_work_t value();
+ };
+
+ /// A special value used for accessing the outstanding_work_t::untracked_t
+ /// property.
+ static constexpr untracked_t untracked;
+
+ /// A special value used for accessing the outstanding_work_t::tracked_t
+ /// property.
+ static constexpr tracked_t tracked;
+
+ /// Default constructor.
+ constexpr outstanding_work_t();
+
+ /// Construct from a sub-property value.
+ constexpr outstanding_work_t(untracked_t);
+
+ /// Construct from a sub-property value.
+ constexpr outstanding_work_t(tracked_t);
+
+ /// Compare property values for equality.
+ friend constexpr bool operator==(
+ const outstanding_work_t& a, const outstanding_work_t& b) noexcept;
+
+ /// Compare property values for inequality.
+ friend constexpr bool operator!=(
+ const outstanding_work_t& a, const outstanding_work_t& b) noexcept;
+};
+
+/// A special value used for accessing the outstanding_work_t property.
+constexpr outstanding_work_t outstanding_work;
+
+} // namespace execution
+
+#else // defined(GENERATING_DOCUMENTATION)
+
+namespace execution {
+namespace detail {
+namespace outstanding_work {
+
+template <int I> struct untracked_t;
+template <int I> struct tracked_t;
+
+} // namespace outstanding_work
+
+template <int I = 0>
+struct outstanding_work_t
+{
+#if defined(ASIO_HAS_VARIABLE_TEMPLATES)
+ template <typename T>
+ static constexpr bool is_applicable_property_v = is_executor<T>::value;
+#endif // defined(ASIO_HAS_VARIABLE_TEMPLATES)
+
+ static constexpr bool is_requirable = false;
+ static constexpr bool is_preferable = false;
+ typedef outstanding_work_t polymorphic_query_result_type;
+
+ typedef detail::outstanding_work::untracked_t<I> untracked_t;
+ typedef detail::outstanding_work::tracked_t<I> tracked_t;
+
+ constexpr outstanding_work_t()
+ : value_(-1)
+ {
+ }
+
+ constexpr outstanding_work_t(untracked_t)
+ : value_(0)
+ {
+ }
+
+ constexpr outstanding_work_t(tracked_t)
+ : value_(1)
+ {
+ }
+
+ template <typename T>
+ struct proxy
+ {
+#if defined(ASIO_HAS_DEDUCED_QUERY_MEMBER_TRAIT)
+ struct type
+ {
+ template <typename P>
+ auto query(P&& p) const
+ noexcept(
+ noexcept(
+ declval<conditional_t<true, T, P>>().query(static_cast<P&&>(p))
+ )
+ )
+ -> decltype(
+ declval<conditional_t<true, T, P>>().query(static_cast<P&&>(p))
+ );
+ };
+#else // defined(ASIO_HAS_DEDUCED_QUERY_MEMBER_TRAIT)
+ typedef T type;
+#endif // defined(ASIO_HAS_DEDUCED_QUERY_MEMBER_TRAIT)
+ };
+
+ 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(P&& p)
+ noexcept(
+ noexcept(
+ conditional_t<true, T, P>::query(static_cast<P&&>(p))
+ )
+ )
+ -> decltype(
+ conditional_t<true, T, P>::query(static_cast<P&&>(p))
+ )
+ {
+ return T::query(static_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_member :
+ traits::query_member<typename proxy<T>::type, outstanding_work_t> {};
+
+ template <typename T>
+ struct query_static_constexpr_member :
+ traits::query_static_constexpr_member<
+ typename static_proxy<T>::type, outstanding_work_t> {};
+
+#if defined(ASIO_HAS_DEDUCED_STATIC_QUERY_TRAIT) \
+ && defined(ASIO_HAS_SFINAE_VARIABLE_TEMPLATES)
+ template <typename T>
+ static constexpr
+ typename query_static_constexpr_member<T>::result_type
+ static_query()
+ noexcept(query_static_constexpr_member<T>::is_noexcept)
+ {
+ return query_static_constexpr_member<T>::value();
+ }
+
+ template <typename T>
+ static constexpr
+ typename traits::static_query<T, untracked_t>::result_type
+ static_query(
+ enable_if_t<
+ !query_static_constexpr_member<T>::is_valid
+ >* = 0,
+ enable_if_t<
+ !query_member<T>::is_valid
+ >* = 0,
+ enable_if_t<
+ traits::static_query<T, untracked_t>::is_valid
+ >* = 0) noexcept
+ {
+ return traits::static_query<T, untracked_t>::value();
+ }
+
+ template <typename T>
+ static constexpr
+ typename traits::static_query<T, tracked_t>::result_type
+ static_query(
+ enable_if_t<
+ !query_static_constexpr_member<T>::is_valid
+ >* = 0,
+ enable_if_t<
+ !query_member<T>::is_valid
+ >* = 0,
+ enable_if_t<
+ !traits::static_query<T, untracked_t>::is_valid
+ >* = 0,
+ enable_if_t<
+ traits::static_query<T, tracked_t>::is_valid
+ >* = 0) noexcept
+ {
+ return traits::static_query<T, tracked_t>::value();
+ }
+
+ template <typename E,
+ typename T = decltype(outstanding_work_t::static_query<E>())>
+ static constexpr const T static_query_v
+ = outstanding_work_t::static_query<E>();
+#endif // defined(ASIO_HAS_DEDUCED_STATIC_QUERY_TRAIT)
+ // && defined(ASIO_HAS_SFINAE_VARIABLE_TEMPLATES)
+
+ friend constexpr bool operator==(
+ const outstanding_work_t& a, const outstanding_work_t& b)
+ {
+ return a.value_ == b.value_;
+ }
+
+ friend constexpr bool operator!=(
+ const outstanding_work_t& a, const outstanding_work_t& b)
+ {
+ return a.value_ != b.value_;
+ }
+
+ struct convertible_from_outstanding_work_t
+ {
+ constexpr convertible_from_outstanding_work_t(outstanding_work_t)
+ {
+ }
+ };
+
+ template <typename Executor>
+ friend constexpr outstanding_work_t query(
+ const Executor& ex, convertible_from_outstanding_work_t,
+ enable_if_t<
+ can_query<const Executor&, untracked_t>::value
+ >* = 0)
+#if !defined(__clang__) // Clang crashes if noexcept is used here.
+#if defined(ASIO_MSVC) // Visual C++ wants the type to be qualified.
+ noexcept(is_nothrow_query<const Executor&,
+ outstanding_work_t<>::untracked_t>::value)
+#else // defined(ASIO_MSVC)
+ noexcept(is_nothrow_query<const Executor&, untracked_t>::value)
+#endif // defined(ASIO_MSVC)
+#endif // !defined(__clang__)
+ {
+ return asio::query(ex, untracked_t());
+ }
+
+ template <typename Executor>
+ friend constexpr outstanding_work_t query(
+ const Executor& ex, convertible_from_outstanding_work_t,
+ enable_if_t<
+ !can_query<const Executor&, untracked_t>::value
+ >* = 0,
+ enable_if_t<
+ can_query<const Executor&, tracked_t>::value
+ >* = 0)
+#if !defined(__clang__) // Clang crashes if noexcept is used here.
+#if defined(ASIO_MSVC) // Visual C++ wants the type to be qualified.
+ noexcept(is_nothrow_query<const Executor&,
+ outstanding_work_t<>::tracked_t>::value)
+#else // defined(ASIO_MSVC)
+ noexcept(is_nothrow_query<const Executor&, tracked_t>::value)
+#endif // defined(ASIO_MSVC)
+#endif // !defined(__clang__)
+ {
+ return asio::query(ex, tracked_t());
+ }
+
+ ASIO_STATIC_CONSTEXPR_DEFAULT_INIT(untracked_t, untracked);
+ ASIO_STATIC_CONSTEXPR_DEFAULT_INIT(tracked_t, tracked);
+
+private:
+ int value_;
+};
+
+#if defined(ASIO_HAS_DEDUCED_STATIC_QUERY_TRAIT) \
+ && defined(ASIO_HAS_SFINAE_VARIABLE_TEMPLATES)
+template <int I> template <typename E, typename T>
+const T outstanding_work_t<I>::static_query_v;
+#endif // defined(ASIO_HAS_DEDUCED_STATIC_QUERY_TRAIT)
+ // && defined(ASIO_HAS_SFINAE_VARIABLE_TEMPLATES)
+
+template <int I>
+const typename outstanding_work_t<I>::untracked_t
+outstanding_work_t<I>::untracked;
+
+template <int I>
+const typename outstanding_work_t<I>::tracked_t
+outstanding_work_t<I>::tracked;
+
+namespace outstanding_work {
+
+template <int I = 0>
+struct untracked_t
+{
+#if defined(ASIO_HAS_VARIABLE_TEMPLATES)
+ template <typename T>
+ static constexpr bool is_applicable_property_v = is_executor<T>::value;
+#endif // defined(ASIO_HAS_VARIABLE_TEMPLATES)
+
+ static constexpr bool is_requirable = true;
+ static constexpr bool is_preferable = true;
+ typedef outstanding_work_t<I> polymorphic_query_result_type;
+
+ constexpr untracked_t()
+ {
+ }
+
+ template <typename T>
+ struct query_member :
+ traits::query_member<
+ typename outstanding_work_t<I>::template proxy<T>::type, untracked_t> {};
+
+ template <typename T>
+ struct query_static_constexpr_member :
+ traits::query_static_constexpr_member<
+ typename outstanding_work_t<I>::template static_proxy<T>::type,
+ untracked_t> {};
+
+#if defined(ASIO_HAS_DEDUCED_STATIC_QUERY_TRAIT) \
+ && defined(ASIO_HAS_SFINAE_VARIABLE_TEMPLATES)
+ template <typename T>
+ static constexpr
+ typename query_static_constexpr_member<T>::result_type
+ static_query()
+ noexcept(query_static_constexpr_member<T>::is_noexcept)
+ {
+ return query_static_constexpr_member<T>::value();
+ }
+
+ template <typename T>
+ static constexpr untracked_t static_query(
+ enable_if_t<
+ !query_static_constexpr_member<T>::is_valid
+ >* = 0,
+ enable_if_t<
+ !query_member<T>::is_valid
+ >* = 0,
+ enable_if_t<
+ !traits::query_free<T, untracked_t>::is_valid
+ >* = 0,
+ enable_if_t<
+ !can_query<T, tracked_t<I>>::value
+ >* = 0) noexcept
+ {
+ return untracked_t();
+ }
+
+ template <typename E, typename T = decltype(untracked_t::static_query<E>())>
+ static constexpr const T static_query_v = untracked_t::static_query<E>();
+#endif // defined(ASIO_HAS_DEDUCED_STATIC_QUERY_TRAIT)
+ // && defined(ASIO_HAS_SFINAE_VARIABLE_TEMPLATES)
+
+ static constexpr outstanding_work_t<I> value()
+ {
+ return untracked_t();
+ }
+
+ friend constexpr bool operator==(const untracked_t&, const untracked_t&)
+ {
+ return true;
+ }
+
+ friend constexpr bool operator!=(const untracked_t&, const untracked_t&)
+ {
+ return false;
+ }
+
+ friend constexpr bool operator==(const untracked_t&, const tracked_t<I>&)
+ {
+ return false;
+ }
+
+ friend constexpr bool operator!=(const untracked_t&, const tracked_t<I>&)
+ {
+ return true;
+ }
+};
+
+#if defined(ASIO_HAS_DEDUCED_STATIC_QUERY_TRAIT) \
+ && defined(ASIO_HAS_SFINAE_VARIABLE_TEMPLATES)
+template <int I> template <typename E, typename T>
+const T untracked_t<I>::static_query_v;
+#endif // defined(ASIO_HAS_DEDUCED_STATIC_QUERY_TRAIT)
+ // && defined(ASIO_HAS_SFINAE_VARIABLE_TEMPLATES)
+
+template <int I = 0>
+struct tracked_t
+{
+#if defined(ASIO_HAS_VARIABLE_TEMPLATES)
+ template <typename T>
+ static constexpr bool is_applicable_property_v = is_executor<T>::value;
+#endif // defined(ASIO_HAS_VARIABLE_TEMPLATES)
+
+ static constexpr bool is_requirable = true;
+ static constexpr bool is_preferable = true;
+ typedef outstanding_work_t<I> polymorphic_query_result_type;
+
+ constexpr tracked_t()
+ {
+ }
+
+ template <typename T>
+ struct query_member :
+ traits::query_member<
+ typename outstanding_work_t<I>::template proxy<T>::type, tracked_t> {};
+
+ template <typename T>
+ struct query_static_constexpr_member :
+ traits::query_static_constexpr_member<
+ typename outstanding_work_t<I>::template static_proxy<T>::type,
+ tracked_t> {};
+
+#if defined(ASIO_HAS_DEDUCED_STATIC_QUERY_TRAIT) \
+ && defined(ASIO_HAS_SFINAE_VARIABLE_TEMPLATES)
+ template <typename T>
+ static constexpr
+ typename query_static_constexpr_member<T>::result_type
+ static_query()
+ noexcept(query_static_constexpr_member<T>::is_noexcept)
+ {
+ return query_static_constexpr_member<T>::value();
+ }
+
+ template <typename E, typename T = decltype(tracked_t::static_query<E>())>
+ static constexpr const T static_query_v = tracked_t::static_query<E>();
+#endif // defined(ASIO_HAS_DEDUCED_STATIC_QUERY_TRAIT)
+ // && defined(ASIO_HAS_SFINAE_VARIABLE_TEMPLATES)
+
+ static constexpr outstanding_work_t<I> value()
+ {
+ return tracked_t();
+ }
+
+ friend constexpr bool operator==(const tracked_t&, const tracked_t&)
+ {
+ return true;
+ }
+
+ friend constexpr bool operator!=(const tracked_t&, const tracked_t&)
+ {
+ return false;
+ }
+
+ friend constexpr bool operator==(const tracked_t&, const untracked_t<I>&)
+ {
+ return false;
+ }
+
+ friend constexpr bool operator!=(const tracked_t&, const untracked_t<I>&)
+ {
+ return true;
+ }
+};
+
+#if defined(ASIO_HAS_DEDUCED_STATIC_QUERY_TRAIT) \
+ && defined(ASIO_HAS_SFINAE_VARIABLE_TEMPLATES)
+template <int I> template <typename E, typename T>
+const T tracked_t<I>::static_query_v;
+#endif // defined(ASIO_HAS_DEDUCED_STATIC_QUERY_TRAIT)
+ // && defined(ASIO_HAS_SFINAE_VARIABLE_TEMPLATES)
+
+} // namespace outstanding_work
+} // namespace detail
+
+typedef detail::outstanding_work_t<> outstanding_work_t;
+
+constexpr outstanding_work_t outstanding_work;
+
+} // namespace execution
+
+#if !defined(ASIO_HAS_VARIABLE_TEMPLATES)
+
+template <typename T>
+struct is_applicable_property<T, execution::outstanding_work_t>
+ : integral_constant<bool, execution::is_executor<T>::value>
+{
+};
+
+template <typename T>
+struct is_applicable_property<T, execution::outstanding_work_t::untracked_t>
+ : integral_constant<bool, execution::is_executor<T>::value>
+{
+};
+
+template <typename T>
+struct is_applicable_property<T, execution::outstanding_work_t::tracked_t>
+ : integral_constant<bool, execution::is_executor<T>::value>
+{
+};
+
+#endif // !defined(ASIO_HAS_VARIABLE_TEMPLATES)
+
+namespace traits {
+
+#if !defined(ASIO_HAS_DEDUCED_QUERY_FREE_TRAIT)
+
+template <typename T>
+struct query_free_default<T, execution::outstanding_work_t,
+ enable_if_t<
+ can_query<T, execution::outstanding_work_t::untracked_t>::value
+ >>
+{
+ static constexpr bool is_valid = true;
+ static constexpr bool is_noexcept =
+ is_nothrow_query<T, execution::outstanding_work_t::untracked_t>::value;
+
+ typedef execution::outstanding_work_t result_type;
+};
+
+template <typename T>
+struct query_free_default<T, execution::outstanding_work_t,
+ enable_if_t<
+ !can_query<T, execution::outstanding_work_t::untracked_t>::value
+ && can_query<T, execution::outstanding_work_t::tracked_t>::value
+ >>
+{
+ static constexpr bool is_valid = true;
+ static constexpr bool is_noexcept =
+ is_nothrow_query<T, execution::outstanding_work_t::tracked_t>::value;
+
+ typedef execution::outstanding_work_t result_type;
+};
+
+#endif // !defined(ASIO_HAS_DEDUCED_QUERY_FREE_TRAIT)
+
+#if !defined(ASIO_HAS_DEDUCED_STATIC_QUERY_TRAIT) \
+ || !defined(ASIO_HAS_SFINAE_VARIABLE_TEMPLATES)
+
+template <typename T>
+struct static_query<T, execution::outstanding_work_t,
+ enable_if_t<
+ execution::detail::outstanding_work_t<0>::
+ query_static_constexpr_member<T>::is_valid
+ >>
+{
+ static constexpr bool is_valid = true;
+ static constexpr bool is_noexcept = true;
+
+ typedef typename execution::detail::outstanding_work_t<0>::
+ query_static_constexpr_member<T>::result_type result_type;
+
+ static constexpr result_type value()
+ {
+ return execution::detail::outstanding_work_t<0>::
+ query_static_constexpr_member<T>::value();
+ }
+};
+
+template <typename T>
+struct static_query<T, execution::outstanding_work_t,
+ enable_if_t<
+ !execution::detail::outstanding_work_t<0>::
+ query_static_constexpr_member<T>::is_valid
+ && !execution::detail::outstanding_work_t<0>::
+ query_member<T>::is_valid
+ && traits::static_query<T,
+ execution::outstanding_work_t::untracked_t>::is_valid
+ >>
+{
+ static constexpr bool is_valid = true;
+ static constexpr bool is_noexcept = true;
+
+ typedef typename traits::static_query<T,
+ execution::outstanding_work_t::untracked_t>::result_type result_type;
+
+ static constexpr result_type value()
+ {
+ return traits::static_query<T,
+ execution::outstanding_work_t::untracked_t>::value();
+ }
+};
+
+template <typename T>
+struct static_query<T, execution::outstanding_work_t,
+ enable_if_t<
+ !execution::detail::outstanding_work_t<0>::
+ query_static_constexpr_member<T>::is_valid
+ && !execution::detail::outstanding_work_t<0>::
+ query_member<T>::is_valid
+ && !traits::static_query<T,
+ execution::outstanding_work_t::untracked_t>::is_valid
+ && traits::static_query<T,
+ execution::outstanding_work_t::tracked_t>::is_valid
+ >>
+{
+ static constexpr bool is_valid = true;
+ static constexpr bool is_noexcept = true;
+
+ typedef typename traits::static_query<T,
+ execution::outstanding_work_t::tracked_t>::result_type result_type;
+
+ static constexpr result_type value()
+ {
+ return traits::static_query<T,
+ execution::outstanding_work_t::tracked_t>::value();
+ }
+};
+
+template <typename T>
+struct static_query<T, execution::outstanding_work_t::untracked_t,
+ enable_if_t<
+ execution::detail::outstanding_work::untracked_t<0>::
+ query_static_constexpr_member<T>::is_valid
+ >>
+{
+ static constexpr bool is_valid = true;
+ static constexpr bool is_noexcept = true;
+
+ typedef typename execution::detail::outstanding_work::untracked_t<0>::
+ query_static_constexpr_member<T>::result_type result_type;
+
+ static constexpr result_type value()
+ {
+ return execution::detail::outstanding_work::untracked_t<0>::
+ query_static_constexpr_member<T>::value();
+ }
+};
+
+template <typename T>
+struct static_query<T, execution::outstanding_work_t::untracked_t,
+ enable_if_t<
+ !execution::detail::outstanding_work::untracked_t<0>::
+ query_static_constexpr_member<T>::is_valid
+ && !execution::detail::outstanding_work::untracked_t<0>::
+ query_member<T>::is_valid
+ && !traits::query_free<T,
+ execution::outstanding_work_t::untracked_t>::is_valid
+ && !can_query<T, execution::outstanding_work_t::tracked_t>::value
+ >>
+{
+ static constexpr bool is_valid = true;
+ static constexpr bool is_noexcept = true;
+
+ typedef execution::outstanding_work_t::untracked_t result_type;
+
+ static constexpr result_type value()
+ {
+ return result_type();
+ }
+};
+
+template <typename T>
+struct static_query<T, execution::outstanding_work_t::tracked_t,
+ enable_if_t<
+ execution::detail::outstanding_work::tracked_t<0>::
+ query_static_constexpr_member<T>::is_valid
+ >>
+{
+ static constexpr bool is_valid = true;
+ static constexpr bool is_noexcept = true;
+
+ typedef typename execution::detail::outstanding_work::tracked_t<0>::
+ query_static_constexpr_member<T>::result_type result_type;
+
+ static constexpr result_type value()
+ {
+ return execution::detail::outstanding_work::tracked_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_OUTSTANDING_WORK_HPP