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Diffstat (limited to '3rdparty/asio/include/asio/execution/relationship.hpp')
-rw-r--r-- | 3rdparty/asio/include/asio/execution/relationship.hpp | 865 |
1 files changed, 865 insertions, 0 deletions
diff --git a/3rdparty/asio/include/asio/execution/relationship.hpp b/3rdparty/asio/include/asio/execution/relationship.hpp new file mode 100644 index 00000000000..95160e07f1a --- /dev/null +++ b/3rdparty/asio/include/asio/execution/relationship.hpp @@ -0,0 +1,865 @@ +// +// execution/relationship.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_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/execution/scheduler.hpp" +#include "asio/execution/sender.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, 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 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, 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 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, + /// 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 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> + 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 relationship_t polymorphic_query_result_type; + + typedef detail::relationship::fork_t<I> fork_t; + typedef detail::relationship::continuation_t<I> continuation_t; + + ASIO_CONSTEXPR relationship_t() + : value_(-1) + { + } + + ASIO_CONSTEXPR relationship_t(fork_t) + : value_(0) + { + } + + ASIO_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(ASIO_MOVE_ARG(P) p) const + noexcept( + noexcept( + declval<typename conditional<true, T, P>::type>().query( + ASIO_MOVE_CAST(P)(p)) + ) + ) + -> decltype( + declval<typename conditional<true, T, P>::type>().query( + ASIO_MOVE_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(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_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 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 T> + static ASIO_CONSTEXPR + typename traits::static_query<T, fork_t>::result_type + static_query( + typename enable_if< + !query_static_constexpr_member<T>::is_valid + >::type* = 0, + typename enable_if< + !query_member<T>::is_valid + >::type* = 0, + typename enable_if< + traits::static_query<T, fork_t>::is_valid + >::type* = 0) ASIO_NOEXCEPT + { + return traits::static_query<T, fork_t>::value(); + } + + template <typename T> + static ASIO_CONSTEXPR + typename traits::static_query<T, continuation_t>::result_type + static_query( + typename enable_if< + !query_static_constexpr_member<T>::is_valid + >::type* = 0, + typename enable_if< + !query_member<T>::is_valid + >::type* = 0, + typename enable_if< + !traits::static_query<T, fork_t>::is_valid + >::type* = 0, + typename enable_if< + traits::static_query<T, continuation_t>::is_valid + >::type* = 0) ASIO_NOEXCEPT + { + return traits::static_query<T, continuation_t>::value(); + } + + template <typename E, + typename T = decltype(relationship_t::static_query<E>())> + static ASIO_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 ASIO_CONSTEXPR bool operator==( + const relationship_t& a, const relationship_t& b) + { + return a.value_ == b.value_; + } + + friend ASIO_CONSTEXPR bool operator!=( + const relationship_t& a, const relationship_t& b) + { + return a.value_ != b.value_; + } + + struct convertible_from_relationship_t + { + ASIO_CONSTEXPR convertible_from_relationship_t(relationship_t) + { + } + }; + + template <typename Executor> + friend ASIO_CONSTEXPR relationship_t query( + const Executor& ex, convertible_from_relationship_t, + typename enable_if< + can_query<const Executor&, fork_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&, relationship_t<>::fork_t>::value)) +#else // defined(ASIO_MSVC) + ASIO_NOEXCEPT_IF(( + 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 ASIO_CONSTEXPR relationship_t query( + const Executor& ex, convertible_from_relationship_t, + typename enable_if< + !can_query<const Executor&, fork_t>::value + >::type* = 0, + typename enable_if< + can_query<const Executor&, continuation_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&, + relationship_t<>::continuation_t>::value)) +#else // defined(ASIO_MSVC) + ASIO_NOEXCEPT_IF(( + 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); + +#if !defined(ASIO_HAS_CONSTEXPR) + static const relationship_t instance; +#endif // !defined(ASIO_HAS_CONSTEXPR) + +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) + +#if !defined(ASIO_HAS_CONSTEXPR) +template <int I> +const relationship_t<I> relationship_t<I>::instance; +#endif + +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> + 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 = true); + ASIO_STATIC_CONSTEXPR(bool, is_preferable = true); + typedef relationship_t<I> polymorphic_query_result_type; + + ASIO_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 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 T> + static ASIO_CONSTEXPR fork_t static_query( + typename enable_if< + !query_static_constexpr_member<T>::is_valid + >::type* = 0, + typename enable_if< + !query_member<T>::is_valid + >::type* = 0, + typename enable_if< + !traits::query_free<T, fork_t>::is_valid + >::type* = 0, + typename enable_if< + !can_query<T, continuation_t<I> >::value + >::type* = 0) ASIO_NOEXCEPT + { + return fork_t(); + } + + template <typename E, typename T = decltype(fork_t::static_query<E>())> + static ASIO_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 ASIO_CONSTEXPR relationship_t<I> value() + { + return fork_t(); + } + + friend ASIO_CONSTEXPR bool operator==( + const fork_t&, const fork_t&) + { + return true; + } + + friend ASIO_CONSTEXPR bool operator!=( + const fork_t&, const fork_t&) + { + return false; + } +}; + +#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> + 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 = true); + ASIO_STATIC_CONSTEXPR(bool, is_preferable = true); + typedef relationship_t<I> polymorphic_query_result_type; + + ASIO_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 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(continuation_t::static_query<E>())> + static ASIO_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 ASIO_CONSTEXPR relationship_t<I> value() + { + return continuation_t(); + } + + friend ASIO_CONSTEXPR bool operator==( + const continuation_t&, const continuation_t&) + { + return true; + } + + friend ASIO_CONSTEXPR bool operator!=( + const continuation_t&, const continuation_t&) + { + return false; + } +}; + +#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; + +#if defined(ASIO_HAS_CONSTEXPR) || defined(GENERATING_DOCUMENTATION) +constexpr relationship_t relationship; +#else // defined(ASIO_HAS_CONSTEXPR) || defined(GENERATING_DOCUMENTATION) +namespace { static const relationship_t& + relationship = relationship_t::instance; } +#endif + +} // 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 + || 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> +{ +}; + +template <typename T> +struct is_applicable_property<T, execution::relationship_t::fork_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> +{ +}; + +template <typename T> +struct is_applicable_property<T, execution::relationship_t::continuation_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_QUERY_FREE_TRAIT) + +template <typename T> +struct query_free_default<T, execution::relationship_t, + typename enable_if< + can_query<T, execution::relationship_t::fork_t>::value + >::type> +{ + ASIO_STATIC_CONSTEXPR(bool, is_valid = true); + ASIO_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, + typename enable_if< + !can_query<T, execution::relationship_t::fork_t>::value + && can_query<T, execution::relationship_t::continuation_t>::value + >::type> +{ + ASIO_STATIC_CONSTEXPR(bool, is_valid = true); + ASIO_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, + typename enable_if< + execution::detail::relationship_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::relationship_t<0>:: + query_static_constexpr_member<T>::result_type result_type; + + static ASIO_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, + typename enable_if< + !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 + >::type> +{ + ASIO_STATIC_CONSTEXPR(bool, is_valid = true); + ASIO_STATIC_CONSTEXPR(bool, is_noexcept = true); + + typedef typename traits::static_query<T, + execution::relationship_t::fork_t>::result_type result_type; + + static ASIO_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, + typename enable_if< + !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 + >::type> +{ + ASIO_STATIC_CONSTEXPR(bool, is_valid = true); + ASIO_STATIC_CONSTEXPR(bool, is_noexcept = true); + + typedef typename traits::static_query<T, + execution::relationship_t::continuation_t>::result_type result_type; + + static ASIO_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, + typename enable_if< + execution::detail::relationship::fork_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::relationship::fork_t<0>:: + query_static_constexpr_member<T>::result_type result_type; + + static ASIO_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, + typename enable_if< + !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 + >::type> +{ + ASIO_STATIC_CONSTEXPR(bool, is_valid = true); + ASIO_STATIC_CONSTEXPR(bool, is_noexcept = true); + + typedef execution::relationship_t::fork_t result_type; + + static ASIO_CONSTEXPR result_type value() + { + return result_type(); + } +}; + +template <typename T> +struct static_query<T, execution::relationship_t::continuation_t, + typename enable_if< + execution::detail::relationship::continuation_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::relationship::continuation_t<0>:: + query_static_constexpr_member<T>::result_type result_type; + + static ASIO_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) + +#if !defined(ASIO_HAS_DEDUCED_STATIC_REQUIRE_TRAIT) + +template <typename T> +struct static_require<T, execution::relationship_t::fork_t, + typename enable_if< + static_query<T, execution::relationship_t::fork_t>::is_valid + >::type> +{ + ASIO_STATIC_CONSTEXPR(bool, is_valid = + (is_same<typename static_query<T, + execution::relationship_t::fork_t>::result_type, + execution::relationship_t::fork_t>::value)); +}; + +template <typename T> +struct static_require<T, execution::relationship_t::continuation_t, + typename enable_if< + static_query<T, execution::relationship_t::continuation_t>::is_valid + >::type> +{ + ASIO_STATIC_CONSTEXPR(bool, is_valid = + (is_same<typename static_query<T, + execution::relationship_t::continuation_t>::result_type, + execution::relationship_t::continuation_t>::value)); +}; + +#endif // !defined(ASIO_HAS_DEDUCED_STATIC_REQUIRE_TRAIT) + +} // namespace traits + +#endif // defined(GENERATING_DOCUMENTATION) + +} // namespace asio + +#include "asio/detail/pop_options.hpp" + +#endif // ASIO_EXECUTION_RELATIONSHIP_HPP |