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Diffstat (limited to '3rdparty/asio/include/asio/execution/blocking.hpp')
-rw-r--r-- | 3rdparty/asio/include/asio/execution/blocking.hpp | 1360 |
1 files changed, 1360 insertions, 0 deletions
diff --git a/3rdparty/asio/include/asio/execution/blocking.hpp b/3rdparty/asio/include/asio/execution/blocking.hpp new file mode 100644 index 00000000000..e120299bded --- /dev/null +++ b/3rdparty/asio/include/asio/execution/blocking.hpp @@ -0,0 +1,1360 @@ +// +// execution/blocking.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_BLOCKING_HPP +#define ASIO_EXECUTION_BLOCKING_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/prefer.hpp" +#include "asio/query.hpp" +#include "asio/require.hpp" +#include "asio/traits/execute_member.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 what guarantees an executor makes about the blocking +/// behaviour of their execution functions. +struct blocking_t +{ + /// The blocking_t property applies to executors. + template <typename T> + static constexpr bool is_applicable_property_v = is_executor_v<T>; + + /// The top-level blocking_t property cannot be required. + static constexpr bool is_requirable = false; + + /// The top-level blocking_t property cannot be preferred. + static constexpr bool is_preferable = false; + + /// The type returned by queries against an @c any_executor. + typedef blocking_t polymorphic_query_result_type; + + /// A sub-property that indicates that invocation of an executor's execution + /// function may block pending completion of one or more invocations of the + /// submitted function object. + struct possibly_t + { + /// The blocking_t::possibly_t property applies to executors. + template <typename T> + static constexpr bool is_applicable_property_v = is_executor_v<T>; + + /// The blocking_t::possibly_t property can be required. + static constexpr bool is_requirable = true; + + /// The blocking_t::possibly_t property can be preferred. + static constexpr bool is_preferable = true; + + /// The type returned by queries against an @c any_executor. + typedef blocking_t polymorphic_query_result_type; + + /// Default constructor. + constexpr possibly_t(); + + /// Get the value associated with a property object. + /** + * @returns possibly_t(); + */ + static constexpr blocking_t value(); + }; + + /// A sub-property that indicates that invocation of an executor's execution + /// function shall block until completion of all invocations of the submitted + /// function object. + struct always_t + { + /// The blocking_t::always_t property applies to executors. + template <typename T> + static constexpr bool is_applicable_property_v = is_executor_v<T>; + + /// The blocking_t::always_t property can be required. + static constexpr bool is_requirable = true; + + /// The blocking_t::always_t property can be preferred. + static constexpr bool is_preferable = false; + + /// The type returned by queries against an @c any_executor. + typedef blocking_t polymorphic_query_result_type; + + /// Default constructor. + constexpr always_t(); + + /// Get the value associated with a property object. + /** + * @returns always_t(); + */ + static constexpr blocking_t value(); + }; + + /// A sub-property that indicates that invocation of an executor's execution + /// function shall not block pending completion of the invocations of the + /// submitted function object. + struct never_t + { + /// The blocking_t::never_t property applies to executors. + template <typename T> + static constexpr bool is_applicable_property_v = is_executor_v<T>; + + /// The blocking_t::never_t property can be required. + static constexpr bool is_requirable = true; + + /// The blocking_t::never_t property can be preferred. + static constexpr bool is_preferable = true; + + /// The type returned by queries against an @c any_executor. + typedef blocking_t polymorphic_query_result_type; + + /// Default constructor. + constexpr never_t(); + + /// Get the value associated with a property object. + /** + * @returns never_t(); + */ + static constexpr blocking_t value(); + }; + + /// A special value used for accessing the blocking_t::possibly_t property. + static constexpr possibly_t possibly; + + /// A special value used for accessing the blocking_t::always_t property. + static constexpr always_t always; + + /// A special value used for accessing the blocking_t::never_t property. + static constexpr never_t never; + + /// Default constructor. + constexpr blocking_t(); + + /// Construct from a sub-property value. + constexpr blocking_t(possibly_t); + + /// Construct from a sub-property value. + constexpr blocking_t(always_t); + + /// Construct from a sub-property value. + constexpr blocking_t(never_t); + + /// Compare property values for equality. + friend constexpr bool operator==( + const blocking_t& a, const blocking_t& b) noexcept; + + /// Compare property values for inequality. + friend constexpr bool operator!=( + const blocking_t& a, const blocking_t& b) noexcept; +}; + +/// A special value used for accessing the blocking_t property. +constexpr blocking_t blocking; + +} // namespace execution + +#else // defined(GENERATING_DOCUMENTATION) + +namespace execution { +namespace detail { +namespace blocking { + +template <int I> struct possibly_t; +template <int I> struct always_t; +template <int I> struct never_t; + +} // namespace blocking +namespace blocking_adaptation { + +template <int I> struct allowed_t; + +template <typename Executor, typename Function> +void blocking_execute( + Executor&& ex, + Function&& func); + +} // namespace blocking_adaptation + +template <int I = 0> +struct blocking_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 blocking_t polymorphic_query_result_type; + + typedef detail::blocking::possibly_t<I> possibly_t; + typedef detail::blocking::always_t<I> always_t; + typedef detail::blocking::never_t<I> never_t; + + constexpr blocking_t() + : value_(-1) + { + } + + constexpr blocking_t(possibly_t) + : value_(0) + { + } + + constexpr blocking_t(always_t) + : value_(1) + { + } + + constexpr blocking_t(never_t) + : value_(2) + { + } + + 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, blocking_t> {}; + + template <typename T> + struct query_static_constexpr_member : + traits::query_static_constexpr_member< + typename static_proxy<T>::type, blocking_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, possibly_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, possibly_t>::is_valid + >* = 0) noexcept + { + return traits::static_query<T, possibly_t>::value(); + } + + template <typename T> + static constexpr + typename traits::static_query<T, always_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, possibly_t>::is_valid + >* = 0, + enable_if_t< + traits::static_query<T, always_t>::is_valid + >* = 0) noexcept + { + return traits::static_query<T, always_t>::value(); + } + + template <typename T> + static constexpr + typename traits::static_query<T, never_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, possibly_t>::is_valid + >* = 0, + enable_if_t< + !traits::static_query<T, always_t>::is_valid + >* = 0, + enable_if_t< + traits::static_query<T, never_t>::is_valid + >* = 0) noexcept + { + return traits::static_query<T, never_t>::value(); + } + + template <typename E, typename T = decltype(blocking_t::static_query<E>())> + static constexpr const T static_query_v + = blocking_t::static_query<E>(); +#endif // defined(ASIO_HAS_DEDUCED_STATIC_QUERY_TRAIT) + // && defined(ASIO_HAS_SFINAE_VARIABLE_TEMPLATES) + + friend constexpr bool operator==( + const blocking_t& a, const blocking_t& b) + { + return a.value_ == b.value_; + } + + friend constexpr bool operator!=( + const blocking_t& a, const blocking_t& b) + { + return a.value_ != b.value_; + } + + struct convertible_from_blocking_t + { + constexpr convertible_from_blocking_t(blocking_t) {} + }; + + template <typename Executor> + friend constexpr blocking_t query( + const Executor& ex, convertible_from_blocking_t, + enable_if_t< + can_query<const Executor&, possibly_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&, blocking_t<>::possibly_t>::value) +#else // defined(ASIO_MSVC) + noexcept(is_nothrow_query<const Executor&, possibly_t>::value) +#endif // defined(ASIO_MSVC) +#endif // !defined(__clang__) + { + return asio::query(ex, possibly_t()); + } + + template <typename Executor> + friend constexpr blocking_t query( + const Executor& ex, convertible_from_blocking_t, + enable_if_t< + !can_query<const Executor&, possibly_t>::value + >* = 0, + enable_if_t< + can_query<const Executor&, always_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&, blocking_t<>::always_t>::value) +#else // defined(ASIO_MSVC) + noexcept(is_nothrow_query<const Executor&, always_t>::value) +#endif // defined(ASIO_MSVC) +#endif // !defined(__clang__) + { + return asio::query(ex, always_t()); + } + + template <typename Executor> + friend constexpr blocking_t query( + const Executor& ex, convertible_from_blocking_t, + enable_if_t< + !can_query<const Executor&, possibly_t>::value + >* = 0, + enable_if_t< + !can_query<const Executor&, always_t>::value + >* = 0, + enable_if_t< + can_query<const Executor&, never_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&, blocking_t<>::never_t>::value) +#else // defined(ASIO_MSVC) + noexcept(is_nothrow_query<const Executor&, never_t>::value) +#endif // defined(ASIO_MSVC) +#endif // !defined(__clang__) + { + return asio::query(ex, never_t()); + } + + ASIO_STATIC_CONSTEXPR_DEFAULT_INIT(possibly_t, possibly); + ASIO_STATIC_CONSTEXPR_DEFAULT_INIT(always_t, always); + ASIO_STATIC_CONSTEXPR_DEFAULT_INIT(never_t, never); + +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 blocking_t<I>::static_query_v; +#endif // defined(ASIO_HAS_DEDUCED_STATIC_QUERY_TRAIT) + // && defined(ASIO_HAS_SFINAE_VARIABLE_TEMPLATES) + +template <int I> +const typename blocking_t<I>::possibly_t blocking_t<I>::possibly; + +template <int I> +const typename blocking_t<I>::always_t blocking_t<I>::always; + +template <int I> +const typename blocking_t<I>::never_t blocking_t<I>::never; + +namespace blocking { + +template <int I = 0> +struct possibly_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 blocking_t<I> polymorphic_query_result_type; + + constexpr possibly_t() + { + } + + template <typename T> + struct query_member : + traits::query_member< + typename blocking_t<I>::template proxy<T>::type, possibly_t> {}; + + template <typename T> + struct query_static_constexpr_member : + traits::query_static_constexpr_member< + typename blocking_t<I>::template static_proxy<T>::type, possibly_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 possibly_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, possibly_t>::is_valid + >* = 0, + enable_if_t< + !can_query<T, always_t<I>>::value + >* = 0, + enable_if_t< + !can_query<T, never_t<I>>::value + >* = 0) noexcept + { + return possibly_t(); + } + + template <typename E, typename T = decltype(possibly_t::static_query<E>())> + static constexpr const T static_query_v + = possibly_t::static_query<E>(); +#endif // defined(ASIO_HAS_SFINAE_VARIABLE_TEMPLATES) + // && defined(ASIO_HAS_SFINAE_VARIABLE_TEMPLATES) + + static constexpr blocking_t<I> value() + { + return possibly_t(); + } + + friend constexpr bool operator==( + const possibly_t&, const possibly_t&) + { + return true; + } + + friend constexpr bool operator!=( + const possibly_t&, const possibly_t&) + { + return false; + } + + friend constexpr bool operator==( + const possibly_t&, const always_t<I>&) + { + return false; + } + + friend constexpr bool operator!=( + const possibly_t&, const always_t<I>&) + { + return true; + } + + friend constexpr bool operator==( + const possibly_t&, const never_t<I>&) + { + return false; + } + + friend constexpr bool operator!=( + const possibly_t&, const never_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 possibly_t<I>::static_query_v; +#endif // defined(ASIO_HAS_DEDUCED_STATIC_QUERY_TRAIT) + // && defined(ASIO_HAS_SFINAE_VARIABLE_TEMPLATES) + +template <typename Executor> +class adapter +{ +public: + adapter(int, const Executor& e) noexcept + : executor_(e) + { + } + + adapter(const adapter& other) noexcept + : executor_(other.executor_) + { + } + + adapter(adapter&& other) noexcept + : executor_(static_cast<Executor&&>(other.executor_)) + { + } + + template <int I> + static constexpr always_t<I> query(blocking_t<I>) noexcept + { + return always_t<I>(); + } + + template <int I> + static constexpr always_t<I> query(possibly_t<I>) noexcept + { + return always_t<I>(); + } + + template <int I> + static constexpr always_t<I> query(always_t<I>) noexcept + { + return always_t<I>(); + } + + template <int I> + static constexpr always_t<I> query(never_t<I>) noexcept + { + return always_t<I>(); + } + + template <typename Property> + enable_if_t< + can_query<const Executor&, Property>::value, + query_result_t<const Executor&, Property> + > query(const Property& p) const + noexcept(is_nothrow_query<const Executor&, Property>::value) + { + return asio::query(executor_, p); + } + + template <int I> + enable_if_t< + can_require<const Executor&, possibly_t<I>>::value, + require_result_t<const Executor&, possibly_t<I>> + > require(possibly_t<I>) const noexcept + { + return asio::require(executor_, possibly_t<I>()); + } + + template <int I> + enable_if_t< + can_require<const Executor&, never_t<I>>::value, + require_result_t<const Executor&, never_t<I>> + > require(never_t<I>) const noexcept + { + return asio::require(executor_, never_t<I>()); + } + + template <typename Property> + enable_if_t< + can_require<const Executor&, Property>::value, + adapter<decay_t<require_result_t<const Executor&, Property>>> + > require(const Property& p) const + noexcept(is_nothrow_require<const Executor&, Property>::value) + { + return adapter<decay_t<require_result_t<const Executor&, Property>>>( + 0, asio::require(executor_, p)); + } + + template <typename Property> + enable_if_t< + can_prefer<const Executor&, Property>::value, + adapter<decay_t<prefer_result_t<const Executor&, Property>>> + > prefer(const Property& p) const + noexcept(is_nothrow_prefer<const Executor&, Property>::value) + { + return adapter<decay_t<prefer_result_t<const Executor&, Property>>>( + 0, asio::prefer(executor_, p)); + } + + template <typename Function> + enable_if_t< + traits::execute_member<const Executor&, Function>::is_valid + > execute(Function&& f) const + { + blocking_adaptation::blocking_execute( + executor_, static_cast<Function&&>(f)); + } + + friend bool operator==(const adapter& a, const adapter& b) noexcept + { + return a.executor_ == b.executor_; + } + + friend bool operator!=(const adapter& a, const adapter& b) noexcept + { + return a.executor_ != b.executor_; + } + +private: + Executor executor_; +}; + +template <int I = 0> +struct always_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 = false; + typedef blocking_t<I> polymorphic_query_result_type; + + constexpr always_t() + { + } + + template <typename T> + struct query_member : + traits::query_member< + typename blocking_t<I>::template proxy<T>::type, always_t> {}; + + template <typename T> + struct query_static_constexpr_member : + traits::query_static_constexpr_member< + typename blocking_t<I>::template static_proxy<T>::type, always_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(always_t::static_query<E>())> + static constexpr const T static_query_v = always_t::static_query<E>(); +#endif // defined(ASIO_HAS_SFINAE_VARIABLE_TEMPLATES) + // && defined(ASIO_HAS_SFINAE_VARIABLE_TEMPLATES) + + static constexpr blocking_t<I> value() + { + return always_t(); + } + + friend constexpr bool operator==( + const always_t&, const always_t&) + { + return true; + } + + friend constexpr bool operator!=( + const always_t&, const always_t&) + { + return false; + } + + friend constexpr bool operator==( + const always_t&, const possibly_t<I>&) + { + return false; + } + + friend constexpr bool operator!=( + const always_t&, const possibly_t<I>&) + { + return true; + } + + friend constexpr bool operator==( + const always_t&, const never_t<I>&) + { + return false; + } + + friend constexpr bool operator!=( + const always_t&, const never_t<I>&) + { + return true; + } + + template <typename Executor> + friend adapter<Executor> require( + const Executor& e, const always_t&, + enable_if_t< + is_executor<Executor>::value + >* = 0, + enable_if_t< + traits::static_require< + const Executor&, + blocking_adaptation::allowed_t<0> + >::is_valid + >* = 0) + { + return adapter<Executor>(0, e); + } +}; + +#if defined(ASIO_HAS_DEDUCED_STATIC_QUERY_TRAIT) \ + && defined(ASIO_HAS_SFINAE_VARIABLE_TEMPLATES) +template <int I> template <typename E, typename T> +const T always_t<I>::static_query_v; +#endif // defined(ASIO_HAS_DEDUCED_STATIC_QUERY_TRAIT) + // && defined(ASIO_HAS_SFINAE_VARIABLE_TEMPLATES) + +template <int I> +struct never_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 blocking_t<I> polymorphic_query_result_type; + + constexpr never_t() + { + } + + template <typename T> + struct query_member : + traits::query_member< + typename blocking_t<I>::template proxy<T>::type, never_t> {}; + + template <typename T> + struct query_static_constexpr_member : + traits::query_static_constexpr_member< + typename blocking_t<I>::template static_proxy<T>::type, never_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(never_t::static_query<E>())> + static constexpr const T static_query_v + = never_t::static_query<E>(); +#endif // defined(ASIO_HAS_DEDUCED_STATIC_QUERY_TRAIT) + // && defined(ASIO_HAS_SFINAE_VARIABLE_TEMPLATES) + + static constexpr blocking_t<I> value() + { + return never_t(); + } + + friend constexpr bool operator==(const never_t&, const never_t&) + { + return true; + } + + friend constexpr bool operator!=(const never_t&, const never_t&) + { + return false; + } + + friend constexpr bool operator==(const never_t&, const possibly_t<I>&) + { + return false; + } + + friend constexpr bool operator!=(const never_t&, const possibly_t<I>&) + { + return true; + } + + friend constexpr bool operator==(const never_t&, const always_t<I>&) + { + return false; + } + + friend constexpr bool operator!=(const never_t&, const always_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 never_t<I>::static_query_v; +#endif // defined(ASIO_HAS_SFINAE_VARIABLE_TEMPLATES) + +} // namespace blocking +} // namespace detail + +typedef detail::blocking_t<> blocking_t; + +constexpr blocking_t blocking; + +} // namespace execution + +#if !defined(ASIO_HAS_VARIABLE_TEMPLATES) + +template <typename T> +struct is_applicable_property<T, execution::blocking_t> + : integral_constant<bool, execution::is_executor<T>::value> +{ +}; + +template <typename T> +struct is_applicable_property<T, execution::blocking_t::possibly_t> + : integral_constant<bool, execution::is_executor<T>::value> +{ +}; + +template <typename T> +struct is_applicable_property<T, execution::blocking_t::always_t> + : integral_constant<bool, execution::is_executor<T>::value> +{ +}; + +template <typename T> +struct is_applicable_property<T, execution::blocking_t::never_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::blocking_t, + enable_if_t< + can_query<T, execution::blocking_t::possibly_t>::value + >> +{ + static constexpr bool is_valid = true; + static constexpr bool is_noexcept = + is_nothrow_query<T, execution::blocking_t::possibly_t>::value; + + typedef execution::blocking_t result_type; +}; + +template <typename T> +struct query_free_default<T, execution::blocking_t, + enable_if_t< + !can_query<T, execution::blocking_t::possibly_t>::value + && can_query<T, execution::blocking_t::always_t>::value + >> +{ + static constexpr bool is_valid = true; + static constexpr bool is_noexcept = + is_nothrow_query<T, execution::blocking_t::always_t>::value; + + typedef execution::blocking_t result_type; +}; + +template <typename T> +struct query_free_default<T, execution::blocking_t, + enable_if_t< + !can_query<T, execution::blocking_t::possibly_t>::value + && !can_query<T, execution::blocking_t::always_t>::value + && can_query<T, execution::blocking_t::never_t>::value + >> +{ + static constexpr bool is_valid = true; + static constexpr bool is_noexcept = + is_nothrow_query<T, execution::blocking_t::never_t>::value; + + typedef execution::blocking_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::blocking_t, + enable_if_t< + execution::detail::blocking_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::blocking_t<0>:: + query_static_constexpr_member<T>::result_type result_type; + + static constexpr result_type value() + { + return execution::blocking_t::query_static_constexpr_member<T>::value(); + } +}; + +template <typename T> +struct static_query<T, execution::blocking_t, + enable_if_t< + !execution::detail::blocking_t<0>:: + query_static_constexpr_member<T>::is_valid + && !execution::detail::blocking_t<0>:: + query_member<T>::is_valid + && traits::static_query<T, execution::blocking_t::possibly_t>::is_valid + >> +{ + static constexpr bool is_valid = true; + static constexpr bool is_noexcept = true; + + typedef typename traits::static_query<T, + execution::blocking_t::possibly_t>::result_type result_type; + + static constexpr result_type value() + { + return traits::static_query<T, execution::blocking_t::possibly_t>::value(); + } +}; + +template <typename T> +struct static_query<T, execution::blocking_t, + enable_if_t< + !execution::detail::blocking_t<0>:: + query_static_constexpr_member<T>::is_valid + && !execution::detail::blocking_t<0>:: + query_member<T>::is_valid + && !traits::static_query<T, execution::blocking_t::possibly_t>::is_valid + && traits::static_query<T, execution::blocking_t::always_t>::is_valid + >> +{ + static constexpr bool is_valid = true; + static constexpr bool is_noexcept = true; + + typedef typename traits::static_query<T, + execution::blocking_t::always_t>::result_type result_type; + + static constexpr result_type value() + { + return traits::static_query<T, execution::blocking_t::always_t>::value(); + } +}; + +template <typename T> +struct static_query<T, execution::blocking_t, + enable_if_t< + !execution::detail::blocking_t<0>:: + query_static_constexpr_member<T>::is_valid + && !execution::detail::blocking_t<0>:: + query_member<T>::is_valid + && !traits::static_query<T, execution::blocking_t::possibly_t>::is_valid + && !traits::static_query<T, execution::blocking_t::always_t>::is_valid + && traits::static_query<T, execution::blocking_t::never_t>::is_valid + >> +{ + static constexpr bool is_valid = true; + static constexpr bool is_noexcept = true; + + typedef typename traits::static_query<T, + execution::blocking_t::never_t>::result_type result_type; + + static constexpr result_type value() + { + return traits::static_query<T, execution::blocking_t::never_t>::value(); + } +}; + +template <typename T> +struct static_query<T, execution::blocking_t::possibly_t, + enable_if_t< + execution::detail::blocking::possibly_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::blocking::possibly_t<0>:: + query_static_constexpr_member<T>::result_type result_type; + + static constexpr result_type value() + { + return execution::detail::blocking::possibly_t<0>:: + query_static_constexpr_member<T>::value(); + } +}; + +template <typename T> +struct static_query<T, execution::blocking_t::possibly_t, + enable_if_t< + !execution::detail::blocking::possibly_t<0>:: + query_static_constexpr_member<T>::is_valid + && !execution::detail::blocking::possibly_t<0>:: + query_member<T>::is_valid + && !traits::query_free<T, execution::blocking_t::possibly_t>::is_valid + && !can_query<T, execution::blocking_t::always_t>::value + && !can_query<T, execution::blocking_t::never_t>::value + >> +{ + static constexpr bool is_valid = true; + static constexpr bool is_noexcept = true; + + typedef execution::blocking_t::possibly_t result_type; + + static constexpr result_type value() + { + return result_type(); + } +}; + +template <typename T> +struct static_query<T, execution::blocking_t::always_t, + enable_if_t< + execution::detail::blocking::always_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::blocking::always_t<0>:: + query_static_constexpr_member<T>::result_type result_type; + + static constexpr result_type value() + { + return execution::detail::blocking::always_t<0>:: + query_static_constexpr_member<T>::value(); + } +}; + +template <typename T> +struct static_query<T, execution::blocking_t::never_t, + enable_if_t< + execution::detail::blocking::never_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::blocking::never_t<0>:: + query_static_constexpr_member<T>::result_type result_type; + + static constexpr result_type value() + { + return execution::detail::blocking::never_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_REQUIRE_FREE_TRAIT) + +template <typename T> +struct require_free_default<T, execution::blocking_t::always_t, + enable_if_t< + is_same<T, decay_t<T>>::value + && execution::is_executor<T>::value + && traits::static_require< + const T&, + execution::detail::blocking_adaptation::allowed_t<0> + >::is_valid + >> +{ + static constexpr bool is_valid = true; + static constexpr bool is_noexcept = false; + typedef execution::detail::blocking::adapter<T> result_type; +}; + +#endif // !defined(ASIO_HAS_DEDUCED_REQUIRE_FREE_TRAIT) + +#if !defined(ASIO_HAS_DEDUCED_EQUALITY_COMPARABLE_TRAIT) + +template <typename Executor> +struct equality_comparable< + execution::detail::blocking::adapter<Executor>> +{ + static constexpr bool is_valid = true; + static constexpr bool is_noexcept = true; +}; + +#endif // !defined(ASIO_HAS_DEDUCED_EQUALITY_COMPARABLE_TRAIT) + +#if !defined(ASIO_HAS_DEDUCED_EXECUTE_MEMBER_TRAIT) + +template <typename Executor, typename Function> +struct execute_member< + execution::detail::blocking::adapter<Executor>, Function> +{ + static constexpr bool is_valid = true; + static constexpr bool is_noexcept = false; + typedef void result_type; +}; + +#endif // !defined(ASIO_HAS_DEDUCED_EXECUTE_MEMBER_TRAIT) + +#if !defined(ASIO_HAS_DEDUCED_QUERY_STATIC_CONSTEXPR_MEMBER_TRAIT) + +template <typename Executor, int I> +struct query_static_constexpr_member< + execution::detail::blocking::adapter<Executor>, + execution::detail::blocking_t<I>> +{ + static constexpr bool is_valid = true; + static constexpr bool is_noexcept = true; + typedef execution::blocking_t::always_t result_type; + + static constexpr result_type value() noexcept + { + return result_type(); + } +}; + +template <typename Executor, int I> +struct query_static_constexpr_member< + execution::detail::blocking::adapter<Executor>, + execution::detail::blocking::always_t<I>> +{ + static constexpr bool is_valid = true; + static constexpr bool is_noexcept = true; + typedef execution::blocking_t::always_t result_type; + + static constexpr result_type value() noexcept + { + return result_type(); + } +}; + +template <typename Executor, int I> +struct query_static_constexpr_member< + execution::detail::blocking::adapter<Executor>, + execution::detail::blocking::possibly_t<I>> +{ + static constexpr bool is_valid = true; + static constexpr bool is_noexcept = true; + typedef execution::blocking_t::always_t result_type; + + static constexpr result_type value() noexcept + { + return result_type(); + } +}; + +template <typename Executor, int I> +struct query_static_constexpr_member< + execution::detail::blocking::adapter<Executor>, + execution::detail::blocking::never_t<I>> +{ + static constexpr bool is_valid = true; + static constexpr bool is_noexcept = true; + typedef execution::blocking_t::always_t result_type; + + static constexpr result_type value() noexcept + { + return result_type(); + } +}; + +#endif // !defined(ASIO_HAS_DEDUCED_QUERY_STATIC_CONSTEXPR_MEMBER_TRAIT) + +#if !defined(ASIO_HAS_DEDUCED_QUERY_MEMBER_TRAIT) + +template <typename Executor, typename Property> +struct query_member< + execution::detail::blocking::adapter<Executor>, Property, + enable_if_t< + can_query<const Executor&, Property>::value + >> +{ + static constexpr bool is_valid = true; + static constexpr bool is_noexcept = + is_nothrow_query<Executor, Property>::value; + typedef query_result_t<Executor, Property> result_type; +}; + +#endif // !defined(ASIO_HAS_DEDUCED_QUERY_MEMBER_TRAIT) + +#if !defined(ASIO_HAS_DEDUCED_REQUIRE_MEMBER_TRAIT) + +template <typename Executor, int I> +struct require_member< + execution::detail::blocking::adapter<Executor>, + execution::detail::blocking::possibly_t<I>, + enable_if_t< + can_require< + const Executor&, + execution::detail::blocking::possibly_t<I> + >::value + >> +{ + static constexpr bool is_valid = true; + static constexpr bool is_noexcept = + is_nothrow_require<const Executor&, + execution::detail::blocking::possibly_t<I>>::value; + typedef require_result_t<const Executor&, + execution::detail::blocking::possibly_t<I>> result_type; +}; + +template <typename Executor, int I> +struct require_member< + execution::detail::blocking::adapter<Executor>, + execution::detail::blocking::never_t<I>, + enable_if_t< + can_require< + const Executor&, + execution::detail::blocking::never_t<I> + >::value + >> +{ + static constexpr bool is_valid = true; + static constexpr bool is_noexcept = + is_nothrow_require<const Executor&, + execution::detail::blocking::never_t<I>>::value; + typedef require_result_t<const Executor&, + execution::detail::blocking::never_t<I>> result_type; +}; + +template <typename Executor, typename Property> +struct require_member< + execution::detail::blocking::adapter<Executor>, Property, + enable_if_t< + can_require<const Executor&, Property>::value + >> +{ + static constexpr bool is_valid = true; + static constexpr bool is_noexcept = + is_nothrow_require<Executor, Property>::value; + typedef execution::detail::blocking::adapter< + decay_t<require_result_t<Executor, Property>>> result_type; +}; + +#endif // !defined(ASIO_HAS_DEDUCED_REQUIRE_MEMBER_TRAIT) + +#if !defined(ASIO_HAS_DEDUCED_PREFER_MEMBER_TRAIT) + +template <typename Executor, typename Property> +struct prefer_member< + execution::detail::blocking::adapter<Executor>, Property, + enable_if_t< + can_prefer<const Executor&, Property>::value + >> +{ + static constexpr bool is_valid = true; + static constexpr bool is_noexcept = + is_nothrow_prefer<Executor, Property>::value; + typedef execution::detail::blocking::adapter< + decay_t<prefer_result_t<Executor, Property>>> result_type; +}; + +#endif // !defined(ASIO_HAS_DEDUCED_PREFER_MEMBER_TRAIT) + +} // namespace traits + +#endif // defined(GENERATING_DOCUMENTATION) + +} // namespace asio + +#include "asio/detail/pop_options.hpp" + +#endif // ASIO_EXECUTION_BLOCKING_HPP |