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Diffstat (limited to '3rdparty/asio/include/asio/execution/execute.hpp')
-rw-r--r-- | 3rdparty/asio/include/asio/execution/execute.hpp | 283 |
1 files changed, 283 insertions, 0 deletions
diff --git a/3rdparty/asio/include/asio/execution/execute.hpp b/3rdparty/asio/include/asio/execution/execute.hpp new file mode 100644 index 00000000000..54eb31bebab --- /dev/null +++ b/3rdparty/asio/include/asio/execution/execute.hpp @@ -0,0 +1,283 @@ +// +// execution/execute.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_EXECUTE_HPP +#define ASIO_EXECUTION_EXECUTE_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/detail/as_invocable.hpp" +#include "asio/execution/detail/as_receiver.hpp" +#include "asio/traits/execute_member.hpp" +#include "asio/traits/execute_free.hpp" + +#include "asio/detail/push_options.hpp" + +#if defined(GENERATING_DOCUMENTATION) + +namespace asio { +namespace execution { + +/// A customisation point that executes a function on an executor. +/** + * The name <tt>execution::execute</tt> denotes a customisation point object. + * + * For some subexpressions <tt>e</tt> and <tt>f</tt>, let <tt>E</tt> be a type + * such that <tt>decltype((e))</tt> is <tt>E</tt> and let <tt>F</tt> be a type + * such that <tt>decltype((f))</tt> is <tt>F</tt>. The expression + * <tt>execution::execute(e, f)</tt> is ill-formed if <tt>F</tt> does not model + * <tt>invocable</tt>, or if <tt>E</tt> does not model either <tt>executor</tt> + * or <tt>sender</tt>. Otherwise, it is expression-equivalent to: + * + * @li <tt>e.execute(f)</tt>, if that expression is valid. If the function + * selected does not execute the function object <tt>f</tt> on the executor + * <tt>e</tt>, the program is ill-formed with no diagnostic required. + * + * @li Otherwise, <tt>execute(e, f)</tt>, if that expression is valid, with + * overload resolution performed in a context that includes the declaration + * <tt>void execute();</tt> and that does not include a declaration of + * <tt>execution::execute</tt>. If the function selected by overload + * resolution does not execute the function object <tt>f</tt> on the executor + * <tt>e</tt>, the program is ill-formed with no diagnostic required. + */ +inline constexpr unspecified execute = unspecified; + +/// A type trait that determines whether a @c execute expression is well-formed. +/** + * Class template @c can_execute is a trait that is derived from + * @c true_type if the expression <tt>execution::execute(std::declval<T>(), + * std::declval<F>())</tt> is well formed; otherwise @c false_type. + */ +template <typename T, typename F> +struct can_execute : + integral_constant<bool, automatically_determined> +{ +}; + +} // namespace execution +} // namespace asio + +#else // defined(GENERATING_DOCUMENTATION) + +namespace asio { +namespace execution { + +template <typename T, typename R> +struct is_sender_to; + +namespace detail { + +template <typename S, typename R> +void submit_helper(ASIO_MOVE_ARG(S) s, ASIO_MOVE_ARG(R) r); + +} // namespace detail +} // namespace execution +} // namespace asio +namespace asio_execution_execute_fn { + +using asio::conditional; +using asio::decay; +using asio::declval; +using asio::enable_if; +using asio::execution::detail::as_receiver; +using asio::execution::detail::is_as_invocable; +using asio::execution::is_sender_to; +using asio::false_type; +using asio::result_of; +using asio::traits::execute_free; +using asio::traits::execute_member; +using asio::true_type; +using asio::void_type; + +void execute(); + +enum overload_type +{ + call_member, + call_free, + adapter, + ill_formed +}; + +template <typename Impl, typename T, typename F, typename = void, + typename = void, typename = void, typename = void, typename = void> +struct call_traits +{ + ASIO_STATIC_CONSTEXPR(overload_type, overload = ill_formed); +}; + +template <typename Impl, typename T, typename F> +struct call_traits<Impl, T, void(F), + typename enable_if< + execute_member<typename Impl::template proxy<T>::type, F>::is_valid + >::type> : + execute_member<typename Impl::template proxy<T>::type, F> +{ + ASIO_STATIC_CONSTEXPR(overload_type, overload = call_member); +}; + +template <typename Impl, typename T, typename F> +struct call_traits<Impl, T, void(F), + typename enable_if< + !execute_member<typename Impl::template proxy<T>, F>::is_valid + >::type, + typename enable_if< + execute_free<T, F>::is_valid + >::type> : + execute_free<T, F> +{ + ASIO_STATIC_CONSTEXPR(overload_type, overload = call_free); +}; + +template <typename Impl, typename T, typename F> +struct call_traits<Impl, T, void(F), + typename enable_if< + !execute_member<typename Impl::template proxy<T>::type, F>::is_valid + >::type, + typename enable_if< + !execute_free<T, F>::is_valid + >::type, + typename void_type< + typename result_of<typename decay<F>::type&()>::type + >::type, + typename enable_if< + !is_as_invocable<typename decay<F>::type>::value + >::type, + typename enable_if< + is_sender_to<T, as_receiver<typename decay<F>::type, T> >::value + >::type> +{ + ASIO_STATIC_CONSTEXPR(overload_type, overload = adapter); + ASIO_STATIC_CONSTEXPR(bool, is_valid = true); + ASIO_STATIC_CONSTEXPR(bool, is_noexcept = false); + typedef void result_type; +}; + +struct impl +{ + template <typename T> + struct proxy + { +#if defined(ASIO_HAS_DEDUCED_EXECUTE_MEMBER_TRAIT) + struct type + { + template <typename F> + auto execute(ASIO_MOVE_ARG(F) f) + noexcept( + noexcept( + declval<typename conditional<true, T, F>::type>().execute( + ASIO_MOVE_CAST(F)(f)) + ) + ) + -> decltype( + declval<typename conditional<true, T, F>::type>().execute( + ASIO_MOVE_CAST(F)(f)) + ); + }; +#else // defined(ASIO_HAS_DEDUCED_EXECUTE_MEMBER_TRAIT) + typedef T type; +#endif // defined(ASIO_HAS_DEDUCED_EXECUTE_MEMBER_TRAIT) + }; + + template <typename T, typename F> + ASIO_CONSTEXPR typename enable_if< + call_traits<impl, T, void(F)>::overload == call_member, + typename call_traits<impl, T, void(F)>::result_type + >::type + operator()( + ASIO_MOVE_ARG(T) t, + ASIO_MOVE_ARG(F) f) const + ASIO_NOEXCEPT_IF(( + call_traits<impl, T, void(F)>::is_noexcept)) + { + return ASIO_MOVE_CAST(T)(t).execute(ASIO_MOVE_CAST(F)(f)); + } + + template <typename T, typename F> + ASIO_CONSTEXPR typename enable_if< + call_traits<impl, T, void(F)>::overload == call_free, + typename call_traits<impl, T, void(F)>::result_type + >::type + operator()( + ASIO_MOVE_ARG(T) t, + ASIO_MOVE_ARG(F) f) const + ASIO_NOEXCEPT_IF(( + call_traits<impl, T, void(F)>::is_noexcept)) + { + return execute(ASIO_MOVE_CAST(T)(t), ASIO_MOVE_CAST(F)(f)); + } + + template <typename T, typename F> + ASIO_CONSTEXPR typename enable_if< + call_traits<impl, T, void(F)>::overload == adapter, + typename call_traits<impl, T, void(F)>::result_type + >::type + operator()( + ASIO_MOVE_ARG(T) t, + ASIO_MOVE_ARG(F) f) const + ASIO_NOEXCEPT_IF(( + call_traits<impl, T, void(F)>::is_noexcept)) + { + return asio::execution::detail::submit_helper( + ASIO_MOVE_CAST(T)(t), + as_receiver<typename decay<F>::type, T>( + ASIO_MOVE_CAST(F)(f), 0)); + } +}; + +template <typename T = impl> +struct static_instance +{ + static const T instance; +}; + +template <typename T> +const T static_instance<T>::instance = {}; + +} // namespace asio_execution_execute_fn +namespace asio { +namespace execution { +namespace { + +static ASIO_CONSTEXPR const asio_execution_execute_fn::impl& + execute = asio_execution_execute_fn::static_instance<>::instance; + +} // namespace + +typedef asio_execution_execute_fn::impl execute_t; + +template <typename T, typename F> +struct can_execute : + integral_constant<bool, + asio_execution_execute_fn::call_traits< + execute_t, T, void(F)>::overload != + asio_execution_execute_fn::ill_formed> +{ +}; + +#if defined(ASIO_HAS_VARIABLE_TEMPLATES) + +template <typename T, typename F> +constexpr bool can_execute_v = can_execute<T, F>::value; + +#endif // defined(ASIO_HAS_VARIABLE_TEMPLATES) + +} // namespace execution +} // namespace asio + +#endif // defined(GENERATING_DOCUMENTATION) + +#include "asio/detail/pop_options.hpp" + +#endif // ASIO_EXECUTION_EXECUTE_HPP |