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Diffstat (limited to '3rdparty/asio/include/asio/execution/context.hpp')
-rw-r--r-- | 3rdparty/asio/include/asio/execution/context.hpp | 233 |
1 files changed, 233 insertions, 0 deletions
diff --git a/3rdparty/asio/include/asio/execution/context.hpp b/3rdparty/asio/include/asio/execution/context.hpp new file mode 100644 index 00000000000..f751c7a6e65 --- /dev/null +++ b/3rdparty/asio/include/asio/execution/context.hpp @@ -0,0 +1,233 @@ +// +// execution/context.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_CONTEXT2_HPP +#define ASIO_EXECUTION_CONTEXT2_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/traits/query_static_constexpr_member.hpp" +#include "asio/traits/static_query.hpp" + +#if defined(ASIO_HAS_STD_ANY) +# include <any> +#endif // defined(ASIO_HAS_STD_ANY) + +#include "asio/detail/push_options.hpp" + +namespace asio { + +#if defined(GENERATING_DOCUMENTATION) + +namespace execution { + +/// A property that is used to obtain the execution context that is associated +/// with an executor. +struct context_t +{ + /// The context_t property applies to executors, senders, and schedulers. + template <typename T> + static constexpr bool is_applicable_property_v = + is_executor_v<T> || is_sender_v<T> || is_scheduler_v<T>; + + /// The context_t property cannot be required. + static constexpr bool is_requirable = false; + + /// The context_t property cannot be preferred. + static constexpr bool is_preferable = false; + + /// The type returned by queries against an @c any_executor. + typedef std::any polymorphic_query_result_type; +}; + +/// A special value used for accessing the context_t property. +constexpr context_t context; + +} // namespace execution + +#else // defined(GENERATING_DOCUMENTATION) + +namespace execution { +namespace detail { + +template <int I = 0> +struct context_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); + +#if defined(ASIO_HAS_STD_ANY) + typedef std::any polymorphic_query_result_type; +#endif // defined(ASIO_HAS_STD_ANY) + + ASIO_CONSTEXPR context_t() + { + } + + 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_static_constexpr_member : + traits::query_static_constexpr_member< + typename static_proxy<T>::type, context_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(context_t::static_query<E>())> + static ASIO_CONSTEXPR const T static_query_v + = context_t::static_query<E>(); +#endif // defined(ASIO_HAS_DEDUCED_STATIC_QUERY_TRAIT) + // && defined(ASIO_HAS_SFINAE_VARIABLE_TEMPLATES) + +#if !defined(ASIO_HAS_CONSTEXPR) + static const context_t instance; +#endif // !defined(ASIO_HAS_CONSTEXPR) +}; + +#if defined(ASIO_HAS_DEDUCED_STATIC_QUERY_TRAIT) \ + && defined(ASIO_HAS_SFINAE_VARIABLE_TEMPLATES) +template <int I> template <typename E, typename T> +const T context_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 context_t<I> context_t<I>::instance; +#endif + +} // namespace detail + +typedef detail::context_t<> context_t; + +#if defined(ASIO_HAS_CONSTEXPR) || defined(GENERATING_DOCUMENTATION) +constexpr context_t context; +#else // defined(ASIO_HAS_CONSTEXPR) || defined(GENERATING_DOCUMENTATION) +namespace { static const context_t& context = context_t::instance; } +#endif + +} // namespace execution + +#if !defined(ASIO_HAS_VARIABLE_TEMPLATES) + +template <typename T> +struct is_applicable_property<T, execution::context_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_STATIC_QUERY_TRAIT) \ + || !defined(ASIO_HAS_SFINAE_VARIABLE_TEMPLATES) + +template <typename T> +struct static_query<T, execution::context_t, + typename enable_if< + execution::detail::context_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::context_t<0>:: + query_static_constexpr_member<T>::result_type result_type; + + static ASIO_CONSTEXPR result_type value() + { + return execution::detail::context_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_CONTEXT2_HPP |