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+//
+// execution/relationship.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_RELATIONSHIP_HPP
+#define ASIO_EXECUTION_RELATIONSHIP_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 submitted tasks represent continuations of
+/// the calling context.
+struct relationship_t
+{
+ /// The relationship_t property applies to executors.
+ template <typename T>
+ static constexpr bool is_applicable_property_v = is_executor_v<T>;
+
+ /// The top-level relationship_t property cannot be required.
+ static constexpr bool is_requirable = false;
+
+ /// The top-level relationship_t property cannot be preferred.
+ static constexpr bool is_preferable = false;
+
+ /// The type returned by queries against an @c any_executor.
+ typedef relationship_t polymorphic_query_result_type;
+
+ /// A sub-property that indicates that the executor does not represent a
+ /// continuation of the calling context.
+ struct fork_t
+ {
+ /// The relationship_t::fork_t property applies to executors.
+ template <typename T>
+ static constexpr bool is_applicable_property_v = is_executor_v<T>;
+
+ /// The relationship_t::fork_t property can be required.
+ static constexpr bool is_requirable = true;
+
+ /// The relationship_t::fork_t property can be preferred.
+ static constexpr bool is_preferable = true;
+
+ /// The type returned by queries against an @c any_executor.
+ typedef relationship_t polymorphic_query_result_type;
+
+ /// Default constructor.
+ constexpr fork_t();
+
+ /// Get the value associated with a property object.
+ /**
+ * @returns fork_t();
+ */
+ static constexpr relationship_t value();
+ };
+
+ /// A sub-property that indicates that the executor represents a continuation
+ /// of the calling context.
+ struct continuation_t
+ {
+ /// The relationship_t::continuation_t property applies to executors.
+ template <typename T>
+ static constexpr bool is_applicable_property_v = is_executor_v<T>;
+
+ /// The relationship_t::continuation_t property can be required.
+ static constexpr bool is_requirable = true;
+
+ /// The relationship_t::continuation_t property can be preferred.
+ static constexpr bool is_preferable = true;
+
+ /// The type returned by queries against an @c any_executor.
+ typedef relationship_t polymorphic_query_result_type;
+
+ /// Default constructor.
+ constexpr continuation_t();
+
+ /// Get the value associated with a property object.
+ /**
+ * @returns continuation_t();
+ */
+ static constexpr relationship_t value();
+ };
+
+ /// A special value used for accessing the relationship_t::fork_t property.
+ static constexpr fork_t fork;
+
+ /// A special value used for accessing the relationship_t::continuation_t
+ /// property.
+ static constexpr continuation_t continuation;
+
+ /// Default constructor.
+ constexpr relationship_t();
+
+ /// Construct from a sub-property value.
+ constexpr relationship_t(fork_t);
+
+ /// Construct from a sub-property value.
+ constexpr relationship_t(continuation_t);
+
+ /// Compare property values for equality.
+ friend constexpr bool operator==(
+ const relationship_t& a, const relationship_t& b) noexcept;
+
+ /// Compare property values for inequality.
+ friend constexpr bool operator!=(
+ const relationship_t& a, const relationship_t& b) noexcept;
+};
+
+/// A special value used for accessing the relationship_t property.
+constexpr relationship_t relationship;
+
+} // namespace execution
+
+#else // defined(GENERATING_DOCUMENTATION)
+
+namespace execution {
+namespace detail {
+namespace relationship {
+
+template <int I> struct fork_t;
+template <int I> struct continuation_t;
+
+} // namespace relationship
+
+template <int I = 0>
+struct relationship_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 relationship_t polymorphic_query_result_type;
+
+ typedef detail::relationship::fork_t<I> fork_t;
+ typedef detail::relationship::continuation_t<I> continuation_t;
+
+ constexpr relationship_t()
+ : value_(-1)
+ {
+ }
+
+ constexpr relationship_t(fork_t)
+ : value_(0)
+ {
+ }
+
+ constexpr relationship_t(continuation_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, relationship_t> {};
+
+ template <typename T>
+ struct query_static_constexpr_member :
+ traits::query_static_constexpr_member<
+ typename static_proxy<T>::type, relationship_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, fork_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, fork_t>::is_valid
+ >* = 0) noexcept
+ {
+ return traits::static_query<T, fork_t>::value();
+ }
+
+ template <typename T>
+ static constexpr
+ typename traits::static_query<T, continuation_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, fork_t>::is_valid
+ >* = 0,
+ enable_if_t<
+ traits::static_query<T, continuation_t>::is_valid
+ >* = 0) noexcept
+ {
+ return traits::static_query<T, continuation_t>::value();
+ }
+
+ template <typename E,
+ typename T = decltype(relationship_t::static_query<E>())>
+ static constexpr const T static_query_v
+ = relationship_t::static_query<E>();
+#endif // defined(ASIO_HAS_DEDUCED_STATIC_QUERY_TRAIT)
+ // && defined(ASIO_HAS_SFINAE_VARIABLE_TEMPLATES)
+
+ friend constexpr bool operator==(
+ const relationship_t& a, const relationship_t& b)
+ {
+ return a.value_ == b.value_;
+ }
+
+ friend constexpr bool operator!=(
+ const relationship_t& a, const relationship_t& b)
+ {
+ return a.value_ != b.value_;
+ }
+
+ struct convertible_from_relationship_t
+ {
+ constexpr convertible_from_relationship_t(relationship_t)
+ {
+ }
+ };
+
+ template <typename Executor>
+ friend constexpr relationship_t query(
+ const Executor& ex, convertible_from_relationship_t,
+ enable_if_t<
+ can_query<const Executor&, fork_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&, relationship_t<>::fork_t>::value)
+#else // defined(ASIO_MSVC)
+ noexcept(is_nothrow_query<const Executor&, fork_t>::value)
+#endif // defined(ASIO_MSVC)
+#endif // !defined(__clang__)
+ {
+ return asio::query(ex, fork_t());
+ }
+
+ template <typename Executor>
+ friend constexpr relationship_t query(
+ const Executor& ex, convertible_from_relationship_t,
+ enable_if_t<
+ !can_query<const Executor&, fork_t>::value
+ >* = 0,
+ enable_if_t<
+ can_query<const Executor&, continuation_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&,
+ relationship_t<>::continuation_t>::value)
+#else // defined(ASIO_MSVC)
+ noexcept(is_nothrow_query<const Executor&, continuation_t>::value)
+#endif // defined(ASIO_MSVC)
+#endif // !defined(__clang__)
+ {
+ return asio::query(ex, continuation_t());
+ }
+
+ ASIO_STATIC_CONSTEXPR_DEFAULT_INIT(fork_t, fork);
+ ASIO_STATIC_CONSTEXPR_DEFAULT_INIT(continuation_t, continuation);
+
+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 relationship_t<I>::static_query_v;
+#endif // defined(ASIO_HAS_DEDUCED_STATIC_QUERY_TRAIT)
+ // && defined(ASIO_HAS_SFINAE_VARIABLE_TEMPLATES)
+
+template <int I>
+const typename relationship_t<I>::fork_t relationship_t<I>::fork;
+
+template <int I>
+const typename relationship_t<I>::continuation_t
+relationship_t<I>::continuation;
+
+namespace relationship {
+
+template <int I = 0>
+struct fork_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 relationship_t<I> polymorphic_query_result_type;
+
+ constexpr fork_t()
+ {
+ }
+
+ template <typename T>
+ struct query_member :
+ traits::query_member<
+ typename relationship_t<I>::template proxy<T>::type, fork_t> {};
+
+ template <typename T>
+ struct query_static_constexpr_member :
+ traits::query_static_constexpr_member<
+ typename relationship_t<I>::template static_proxy<T>::type, fork_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 fork_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, fork_t>::is_valid
+ >* = 0,
+ enable_if_t<
+ !can_query<T, continuation_t<I>>::value
+ >* = 0) noexcept
+ {
+ return fork_t();
+ }
+
+ template <typename E, typename T = decltype(fork_t::static_query<E>())>
+ static constexpr const T static_query_v
+ = fork_t::static_query<E>();
+#endif // defined(ASIO_HAS_DEDUCED_STATIC_QUERY_TRAIT)
+ // && defined(ASIO_HAS_SFINAE_VARIABLE_TEMPLATES)
+
+ static constexpr relationship_t<I> value()
+ {
+ return fork_t();
+ }
+
+ friend constexpr bool operator==(const fork_t&, const fork_t&)
+ {
+ return true;
+ }
+
+ friend constexpr bool operator!=(const fork_t&, const fork_t&)
+ {
+ return false;
+ }
+
+ friend constexpr bool operator==(const fork_t&, const continuation_t<I>&)
+ {
+ return false;
+ }
+
+ friend constexpr bool operator!=(const fork_t&, const continuation_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 fork_t<I>::static_query_v;
+#endif // defined(ASIO_HAS_DEDUCED_STATIC_QUERY_TRAIT)
+ // && defined(ASIO_HAS_SFINAE_VARIABLE_TEMPLATES)
+
+template <int I = 0>
+struct continuation_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 relationship_t<I> polymorphic_query_result_type;
+
+ constexpr continuation_t()
+ {
+ }
+
+ template <typename T>
+ struct query_member :
+ traits::query_member<
+ typename relationship_t<I>::template proxy<T>::type, continuation_t> {};
+
+ template <typename T>
+ struct query_static_constexpr_member :
+ traits::query_static_constexpr_member<
+ typename relationship_t<I>::template static_proxy<T>::type,
+ continuation_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(continuation_t::static_query<E>())>
+ static constexpr const T static_query_v
+ = continuation_t::static_query<E>();
+#endif // defined(ASIO_HAS_DEDUCED_STATIC_QUERY_TRAIT)
+ // && defined(ASIO_HAS_SFINAE_VARIABLE_TEMPLATES)
+
+ static constexpr relationship_t<I> value()
+ {
+ return continuation_t();
+ }
+
+ friend constexpr bool operator==(const continuation_t&, const continuation_t&)
+ {
+ return true;
+ }
+
+ friend constexpr bool operator!=(const continuation_t&, const continuation_t&)
+ {
+ return false;
+ }
+
+ friend constexpr bool operator==(const continuation_t&, const fork_t<I>&)
+ {
+ return false;
+ }
+
+ friend constexpr bool operator!=(const continuation_t&, const fork_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 continuation_t<I>::static_query_v;
+#endif // defined(ASIO_HAS_DEDUCED_STATIC_QUERY_TRAIT)
+ // && defined(ASIO_HAS_SFINAE_VARIABLE_TEMPLATES)
+
+} // namespace relationship
+} // namespace detail
+
+typedef detail::relationship_t<> relationship_t;
+
+constexpr relationship_t relationship;
+
+} // namespace execution
+
+#if !defined(ASIO_HAS_VARIABLE_TEMPLATES)
+
+template <typename T>
+struct is_applicable_property<T, execution::relationship_t>
+ : integral_constant<bool, execution::is_executor<T>::value>
+{
+};
+
+template <typename T>
+struct is_applicable_property<T, execution::relationship_t::fork_t>
+ : integral_constant<bool, execution::is_executor<T>::value>
+{
+};
+
+template <typename T>
+struct is_applicable_property<T, execution::relationship_t::continuation_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::relationship_t,
+ enable_if_t<
+ can_query<T, execution::relationship_t::fork_t>::value
+ >>
+{
+ static constexpr bool is_valid = true;
+ static constexpr bool is_noexcept =
+ is_nothrow_query<T, execution::relationship_t::fork_t>::value;
+
+ typedef execution::relationship_t result_type;
+};
+
+template <typename T>
+struct query_free_default<T, execution::relationship_t,
+ enable_if_t<
+ !can_query<T, execution::relationship_t::fork_t>::value
+ && can_query<T, execution::relationship_t::continuation_t>::value
+ >>
+{
+ static constexpr bool is_valid = true;
+ static constexpr bool is_noexcept =
+ is_nothrow_query<T, execution::relationship_t::continuation_t>::value;
+
+ typedef execution::relationship_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::relationship_t,
+ enable_if_t<
+ execution::detail::relationship_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::relationship_t<0>::
+ query_static_constexpr_member<T>::result_type result_type;
+
+ static constexpr result_type value()
+ {
+ return execution::detail::relationship_t<0>::
+ query_static_constexpr_member<T>::value();
+ }
+};
+
+template <typename T>
+struct static_query<T, execution::relationship_t,
+ enable_if_t<
+ !execution::detail::relationship_t<0>::
+ query_static_constexpr_member<T>::is_valid
+ && !execution::detail::relationship_t<0>::
+ query_member<T>::is_valid
+ && traits::static_query<T,
+ execution::relationship_t::fork_t>::is_valid
+ >>
+{
+ static constexpr bool is_valid = true;
+ static constexpr bool is_noexcept = true;
+
+ typedef typename traits::static_query<T,
+ execution::relationship_t::fork_t>::result_type result_type;
+
+ static constexpr result_type value()
+ {
+ return traits::static_query<T,
+ execution::relationship_t::fork_t>::value();
+ }
+};
+
+template <typename T>
+struct static_query<T, execution::relationship_t,
+ enable_if_t<
+ !execution::detail::relationship_t<0>::
+ query_static_constexpr_member<T>::is_valid
+ && !execution::detail::relationship_t<0>::
+ query_member<T>::is_valid
+ && !traits::static_query<T,
+ execution::relationship_t::fork_t>::is_valid
+ && traits::static_query<T,
+ execution::relationship_t::continuation_t>::is_valid
+ >>
+{
+ static constexpr bool is_valid = true;
+ static constexpr bool is_noexcept = true;
+
+ typedef typename traits::static_query<T,
+ execution::relationship_t::continuation_t>::result_type result_type;
+
+ static constexpr result_type value()
+ {
+ return traits::static_query<T,
+ execution::relationship_t::continuation_t>::value();
+ }
+};
+
+template <typename T>
+struct static_query<T, execution::relationship_t::fork_t,
+ enable_if_t<
+ execution::detail::relationship::fork_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::relationship::fork_t<0>::
+ query_static_constexpr_member<T>::result_type result_type;
+
+ static constexpr result_type value()
+ {
+ return execution::detail::relationship::fork_t<0>::
+ query_static_constexpr_member<T>::value();
+ }
+};
+
+template <typename T>
+struct static_query<T, execution::relationship_t::fork_t,
+ enable_if_t<
+ !execution::detail::relationship::fork_t<0>::
+ query_static_constexpr_member<T>::is_valid
+ && !execution::detail::relationship::fork_t<0>::
+ query_member<T>::is_valid
+ && !traits::query_free<T,
+ execution::relationship_t::fork_t>::is_valid
+ && !can_query<T, execution::relationship_t::continuation_t>::value
+ >>
+{
+ static constexpr bool is_valid = true;
+ static constexpr bool is_noexcept = true;
+
+ typedef execution::relationship_t::fork_t result_type;
+
+ static constexpr result_type value()
+ {
+ return result_type();
+ }
+};
+
+template <typename T>
+struct static_query<T, execution::relationship_t::continuation_t,
+ enable_if_t<
+ execution::detail::relationship::continuation_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::relationship::continuation_t<0>::
+ query_static_constexpr_member<T>::result_type result_type;
+
+ static constexpr result_type value()
+ {
+ return execution::detail::relationship::continuation_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_RELATIONSHIP_HPP