diff options
Diffstat (limited to '3rdparty/asio/include/asio/execution/schedule.hpp')
-rw-r--r-- | 3rdparty/asio/include/asio/execution/schedule.hpp | 287 |
1 files changed, 287 insertions, 0 deletions
diff --git a/3rdparty/asio/include/asio/execution/schedule.hpp b/3rdparty/asio/include/asio/execution/schedule.hpp new file mode 100644 index 00000000000..fde0cdda599 --- /dev/null +++ b/3rdparty/asio/include/asio/execution/schedule.hpp @@ -0,0 +1,287 @@ +// +// execution/schedule.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_SCHEDULE_HPP +#define ASIO_EXECUTION_SCHEDULE_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/traits/schedule_member.hpp" +#include "asio/traits/schedule_free.hpp" + +#include "asio/detail/push_options.hpp" + +#if defined(GENERATING_DOCUMENTATION) + +namespace asio { +namespace execution { + +/// A customisation point that is used to obtain a sender from a scheduler. +/** + * The name <tt>execution::schedule</tt> denotes a customisation point object. + * For some subexpression <tt>s</tt>, let <tt>S</tt> be a type such that + * <tt>decltype((s))</tt> is <tt>S</tt>. The expression + * <tt>execution::schedule(s)</tt> is expression-equivalent to: + * + * @li <tt>s.schedule()</tt>, if that expression is valid and its type models + * <tt>sender</tt>. + * + * @li Otherwise, <tt>schedule(s)</tt>, if that expression is valid and its + * type models <tt>sender</tt> with overload resolution performed in a context + * that includes the declaration <tt>void schedule();</tt> and that does not + * include a declaration of <tt>execution::schedule</tt>. + * + * @li Otherwise, <tt>S</tt> if <tt>S</tt> satisfies <tt>executor</tt>. + * + * @li Otherwise, <tt>execution::schedule(s)</tt> is ill-formed. + */ +inline constexpr unspecified schedule = unspecified; + +/// A type trait that determines whether a @c schedule expression is +/// well-formed. +/** + * Class template @c can_schedule is a trait that is derived from @c true_type + * if the expression <tt>execution::schedule(std::declval<S>())</tt> is well + * formed; otherwise @c false_type. + */ +template <typename S> +struct can_schedule : + integral_constant<bool, automatically_determined> +{ +}; + +} // namespace execution +} // namespace asio + +#else // defined(GENERATING_DOCUMENTATION) + +namespace asio_execution_schedule_fn { + +using asio::decay; +using asio::declval; +using asio::enable_if; +using asio::execution::is_executor; +using asio::traits::schedule_free; +using asio::traits::schedule_member; + +void schedule(); + +enum overload_type +{ + identity, + call_member, + call_free, + ill_formed +}; + +template <typename S, typename = void, typename = void, typename = void> +struct call_traits +{ + ASIO_STATIC_CONSTEXPR(overload_type, overload = ill_formed); + ASIO_STATIC_CONSTEXPR(bool, is_noexcept = false); + typedef void result_type; +}; + +template <typename S> +struct call_traits<S, + typename enable_if< + schedule_member<S>::is_valid + >::type> : + schedule_member<S> +{ + ASIO_STATIC_CONSTEXPR(overload_type, overload = call_member); +}; + +template <typename S> +struct call_traits<S, + typename enable_if< + !schedule_member<S>::is_valid + >::type, + typename enable_if< + schedule_free<S>::is_valid + >::type> : + schedule_free<S> +{ + ASIO_STATIC_CONSTEXPR(overload_type, overload = call_free); +}; + +template <typename S> +struct call_traits<S, + typename enable_if< + !schedule_member<S>::is_valid + >::type, + typename enable_if< + !schedule_free<S>::is_valid + >::type, + typename enable_if< + is_executor<typename decay<S>::type>::value + >::type> +{ + ASIO_STATIC_CONSTEXPR(overload_type, overload = identity); + ASIO_STATIC_CONSTEXPR(bool, is_noexcept = true); + +#if defined(ASIO_HAS_MOVE) + typedef ASIO_MOVE_ARG(S) result_type; +#else // defined(ASIO_HAS_MOVE) + typedef ASIO_MOVE_ARG(typename decay<S>::type) result_type; +#endif // defined(ASIO_HAS_MOVE) +}; + +struct impl +{ + template <typename S> + ASIO_CONSTEXPR typename enable_if< + call_traits<S>::overload == identity, + typename call_traits<S>::result_type + >::type + operator()(ASIO_MOVE_ARG(S) s) const + ASIO_NOEXCEPT_IF(( + call_traits<S>::is_noexcept)) + { + return ASIO_MOVE_CAST(S)(s); + } + +#if defined(ASIO_HAS_MOVE) + template <typename S> + ASIO_CONSTEXPR typename enable_if< + call_traits<S>::overload == call_member, + typename call_traits<S>::result_type + >::type + operator()(S&& s) const + ASIO_NOEXCEPT_IF(( + call_traits<S>::is_noexcept)) + { + return ASIO_MOVE_CAST(S)(s).schedule(); + } + + template <typename S> + ASIO_CONSTEXPR typename enable_if< + call_traits<S>::overload == call_free, + typename call_traits<S>::result_type + >::type + operator()(S&& s) const + ASIO_NOEXCEPT_IF(( + call_traits<S>::is_noexcept)) + { + return schedule(ASIO_MOVE_CAST(S)(s)); + } +#else // defined(ASIO_HAS_MOVE) + template <typename S> + ASIO_CONSTEXPR typename enable_if< + call_traits<S&>::overload == call_member, + typename call_traits<S&>::result_type + >::type + operator()(S& s) const + ASIO_NOEXCEPT_IF(( + call_traits<S&>::is_noexcept)) + { + return s.schedule(); + } + + template <typename S> + ASIO_CONSTEXPR typename enable_if< + call_traits<const S&>::overload == call_member, + typename call_traits<const S&>::result_type + >::type + operator()(const S& s) const + ASIO_NOEXCEPT_IF(( + call_traits<const S&>::is_noexcept)) + { + return s.schedule(); + } + + template <typename S> + ASIO_CONSTEXPR typename enable_if< + call_traits<S&>::overload == call_free, + typename call_traits<S&>::result_type + >::type + operator()(S& s) const + ASIO_NOEXCEPT_IF(( + call_traits<S&>::is_noexcept)) + { + return schedule(s); + } + + template <typename S> + ASIO_CONSTEXPR typename enable_if< + call_traits<const S&>::overload == call_free, + typename call_traits<const S&>::result_type + >::type + operator()(const S& s) const + ASIO_NOEXCEPT_IF(( + call_traits<const S&>::is_noexcept)) + { + return schedule(s); + } +#endif // defined(ASIO_HAS_MOVE) +}; + +template <typename T = impl> +struct static_instance +{ + static const T instance; +}; + +template <typename T> +const T static_instance<T>::instance = {}; + +} // namespace asio_execution_schedule_fn +namespace asio { +namespace execution { +namespace { + +static ASIO_CONSTEXPR const asio_execution_schedule_fn::impl& + schedule = asio_execution_schedule_fn::static_instance<>::instance; + +} // namespace + +template <typename S> +struct can_schedule : + integral_constant<bool, + asio_execution_schedule_fn::call_traits<S>::overload != + asio_execution_schedule_fn::ill_formed> +{ +}; + +#if defined(ASIO_HAS_VARIABLE_TEMPLATES) + +template <typename S> +constexpr bool can_schedule_v = can_schedule<S>::value; + +#endif // defined(ASIO_HAS_VARIABLE_TEMPLATES) + +template <typename S> +struct is_nothrow_schedule : + integral_constant<bool, + asio_execution_schedule_fn::call_traits<S>::is_noexcept> +{ +}; + +#if defined(ASIO_HAS_VARIABLE_TEMPLATES) + +template <typename S> +constexpr bool is_nothrow_schedule_v + = is_nothrow_schedule<S>::value; + +#endif // defined(ASIO_HAS_VARIABLE_TEMPLATES) + +} // namespace execution +} // namespace asio + +#endif // defined(GENERATING_DOCUMENTATION) + +#include "asio/detail/pop_options.hpp" + +#endif // ASIO_EXECUTION_SCHEDULE_HPP |