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+//
+// 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