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Diffstat (limited to '3rdparty/asio/include/asio/execution/context_as.hpp')
-rw-r--r-- | 3rdparty/asio/include/asio/execution/context_as.hpp | 221 |
1 files changed, 221 insertions, 0 deletions
diff --git a/3rdparty/asio/include/asio/execution/context_as.hpp b/3rdparty/asio/include/asio/execution/context_as.hpp new file mode 100644 index 00000000000..740918c7993 --- /dev/null +++ b/3rdparty/asio/include/asio/execution/context_as.hpp @@ -0,0 +1,221 @@ +// +// execution/context_as.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_CONTEXT_AS_HPP +#define ASIO_EXECUTION_CONTEXT_AS_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/context.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_static_constexpr_member.hpp" +#include "asio/traits/static_query.hpp" + +#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. +template <typename U> +struct context_as_t +{ + /// The context_as_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 T polymorphic_query_result_type; +}; + +/// A special value used for accessing the context_as_t property. +template <typename U> +constexpr context_as_t context_as; + +} // namespace execution + +#else // defined(GENERATING_DOCUMENTATION) + +namespace execution { + +template <typename T> +struct context_as_t +{ +#if defined(ASIO_HAS_VARIABLE_TEMPLATES) + template <typename U> + ASIO_STATIC_CONSTEXPR(bool, + is_applicable_property_v = ( + is_executor<U>::value + || conditional< + is_executor<U>::value, + false_type, + is_sender<U> + >::type::value + || conditional< + is_executor<U>::value, + false_type, + is_scheduler<U> + >::type::value)); +#endif // defined(ASIO_HAS_VARIABLE_TEMPLATES) + + ASIO_STATIC_CONSTEXPR(bool, is_requirable = false); + ASIO_STATIC_CONSTEXPR(bool, is_preferable = false); + + typedef T polymorphic_query_result_type; + + ASIO_CONSTEXPR context_as_t() + { + } + + ASIO_CONSTEXPR context_as_t(context_t) + { + } + +#if defined(ASIO_HAS_DEDUCED_STATIC_QUERY_TRAIT) \ + && defined(ASIO_HAS_SFINAE_VARIABLE_TEMPLATES) + template <typename E> + static ASIO_CONSTEXPR + typename context_t::query_static_constexpr_member<E>::result_type + static_query() + ASIO_NOEXCEPT_IF(( + context_t::query_static_constexpr_member<E>::is_noexcept)) + { + return context_t::query_static_constexpr_member<E>::value(); + } + + template <typename E, typename U = decltype(context_as_t::static_query<E>())> + static ASIO_CONSTEXPR const U static_query_v + = context_as_t::static_query<E>(); +#endif // defined(ASIO_HAS_DEDUCED_STATIC_QUERY_TRAIT) + // && defined(ASIO_HAS_SFINAE_VARIABLE_TEMPLATES) + + template <typename Executor, typename U> + friend ASIO_CONSTEXPR U query( + const Executor& ex, const context_as_t<U>&, + typename enable_if< + is_same<T, U>::value + >::type* = 0, + typename enable_if< + can_query<const Executor&, const context_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&, const context_t&>::value)) +#else // defined(ASIO_MSVC) + ASIO_NOEXCEPT_IF(( + is_nothrow_query<const Executor&, const context_t&>::value)) +#endif // defined(ASIO_MSVC) +#endif // !defined(__clang__) + { + return asio::query(ex, context); + } +}; + +#if defined(ASIO_HAS_DEDUCED_STATIC_QUERY_TRAIT) \ + && defined(ASIO_HAS_SFINAE_VARIABLE_TEMPLATES) +template <typename T> template <typename E, typename U> +const U context_as_t<T>::static_query_v; +#endif // defined(ASIO_HAS_DEDUCED_STATIC_QUERY_TRAIT) + // && defined(ASIO_HAS_SFINAE_VARIABLE_TEMPLATES) + +#if (defined(ASIO_HAS_VARIABLE_TEMPLATES) \ + && defined(ASIO_HAS_CONSTEXPR)) \ + || defined(GENERATING_DOCUMENTATION) +template <typename T> +constexpr context_as_t<T> context_as{}; +#endif // (defined(ASIO_HAS_VARIABLE_TEMPLATES) + // && defined(ASIO_HAS_CONSTEXPR)) + // || defined(GENERATING_DOCUMENTATION) + +} // namespace execution + +#if !defined(ASIO_HAS_VARIABLE_TEMPLATES) + +template <typename T, typename U> +struct is_applicable_property<T, execution::context_as_t<U> > + : 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, typename U> +struct static_query<T, execution::context_as_t<U>, + typename enable_if< + static_query<T, execution::context_t>::is_valid + >::type> : static_query<T, execution::context_t> +{ +}; + +#endif // !defined(ASIO_HAS_DEDUCED_STATIC_QUERY_TRAIT) + // || !defined(ASIO_HAS_SFINAE_VARIABLE_TEMPLATES) + +#if !defined(ASIO_HAS_DEDUCED_QUERY_FREE_TRAIT) + +template <typename T, typename U> +struct query_free<T, execution::context_as_t<U>, + typename enable_if< + can_query<const T&, const execution::context_t&>::value + >::type> +{ + ASIO_STATIC_CONSTEXPR(bool, is_valid = true); + ASIO_STATIC_CONSTEXPR(bool, is_noexcept = + (is_nothrow_query<const T&, const execution::context_t&>::value)); + + typedef U result_type; +}; + +#endif // !defined(ASIO_HAS_DEDUCED_QUERY_FREE_TRAIT) + +} // namespace traits + +#endif // defined(GENERATING_DOCUMENTATION) + +} // namespace asio + +#include "asio/detail/pop_options.hpp" + +#endif // ASIO_EXECUTION_CONTEXT_AS_HPP |