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+//
+// execution/submit.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_SUBMIT_HPP
+#define ASIO_EXECUTION_SUBMIT_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/submit_receiver.hpp"
+#include "asio/execution/executor.hpp"
+#include "asio/execution/receiver.hpp"
+#include "asio/execution/sender.hpp"
+#include "asio/execution/start.hpp"
+#include "asio/traits/submit_member.hpp"
+#include "asio/traits/submit_free.hpp"
+
+#include "asio/detail/push_options.hpp"
+
+#if defined(GENERATING_DOCUMENTATION)
+
+namespace asio {
+namespace execution {
+
+/// A customisation point that submits a sender to a receiver.
+/**
+ * The name <tt>execution::submit</tt> denotes a customisation point object. For
+ * some subexpressions <tt>s</tt> and <tt>r</tt>, let <tt>S</tt> be a type such
+ * that <tt>decltype((s))</tt> is <tt>S</tt> and let <tt>R</tt> be a type such
+ * that <tt>decltype((r))</tt> is <tt>R</tt>. The expression
+ * <tt>execution::submit(s, r)</tt> is ill-formed if <tt>sender_to<S, R></tt> is
+ * not <tt>true</tt>. Otherwise, it is expression-equivalent to:
+ *
+ * @li <tt>s.submit(r)</tt>, if that expression is valid and <tt>S</tt> models
+ * <tt>sender</tt>. If the function selected does not submit the receiver
+ * object <tt>r</tt> via the sender <tt>s</tt>, the program is ill-formed with
+ * no diagnostic required.
+ *
+ * @li Otherwise, <tt>submit(s, r)</tt>, if that expression is valid and
+ * <tt>S</tt> models <tt>sender</tt>, with overload resolution performed in a
+ * context that includes the declaration <tt>void submit();</tt> and that does
+ * not include a declaration of <tt>execution::submit</tt>. If the function
+ * selected by overload resolution does not submit the receiver object
+ * <tt>r</tt> via the sender <tt>s</tt>, the program is ill-formed with no
+ * diagnostic required.
+ *
+ * @li Otherwise, <tt>execution::start((new submit_receiver<S,
+ * R>{s,r})->state_)</tt>, where <tt>submit_receiver</tt> is an
+ * implementation-defined class template equivalent to:
+ * @code template<class S, class R>
+ * struct submit_receiver {
+ * struct wrap {
+ * submit_receiver * p_;
+ * template<class...As>
+ * requires receiver_of<R, As...>
+ * void set_value(As&&... as) &&
+ * noexcept(is_nothrow_receiver_of_v<R, As...>) {
+ * execution::set_value(std::move(p_->r_), (As&&) as...);
+ * delete p_;
+ * }
+ * template<class E>
+ * requires receiver<R, E>
+ * void set_error(E&& e) && noexcept {
+ * execution::set_error(std::move(p_->r_), (E&&) e);
+ * delete p_;
+ * }
+ * void set_done() && noexcept {
+ * execution::set_done(std::move(p_->r_));
+ * delete p_;
+ * }
+ * };
+ * remove_cvref_t<R> r_;
+ * connect_result_t<S, wrap> state_;
+ * submit_receiver(S&& s, R&& r)
+ * : r_((R&&) r)
+ * , state_(execution::connect((S&&) s, wrap{this})) {}
+ * };
+ * @endcode
+ */
+inline constexpr unspecified submit = unspecified;
+
+/// A type trait that determines whether a @c submit expression is
+/// well-formed.
+/**
+ * Class template @c can_submit is a trait that is derived from
+ * @c true_type if the expression <tt>execution::submit(std::declval<R>(),
+ * std::declval<E>())</tt> is well formed; otherwise @c false_type.
+ */
+template <typename S, typename R>
+struct can_submit :
+ integral_constant<bool, automatically_determined>
+{
+};
+
+} // namespace execution
+} // namespace asio
+
+#else // defined(GENERATING_DOCUMENTATION)
+
+namespace asio_execution_submit_fn {
+
+using asio::declval;
+using asio::enable_if;
+using asio::execution::is_sender_to;
+using asio::traits::submit_free;
+using asio::traits::submit_member;
+
+void submit();
+
+enum overload_type
+{
+ call_member,
+ call_free,
+ adapter,
+ ill_formed
+};
+
+template <typename S, typename R, 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, typename R>
+struct call_traits<S, void(R),
+ typename enable_if<
+ submit_member<S, R>::is_valid
+ >::type,
+ typename enable_if<
+ is_sender_to<S, R>::value
+ >::type> :
+ submit_member<S, R>
+{
+ ASIO_STATIC_CONSTEXPR(overload_type, overload = call_member);
+};
+
+template <typename S, typename R>
+struct call_traits<S, void(R),
+ typename enable_if<
+ !submit_member<S, R>::is_valid
+ >::type,
+ typename enable_if<
+ submit_free<S, R>::is_valid
+ >::type,
+ typename enable_if<
+ is_sender_to<S, R>::value
+ >::type> :
+ submit_free<S, R>
+{
+ ASIO_STATIC_CONSTEXPR(overload_type, overload = call_free);
+};
+
+template <typename S, typename R>
+struct call_traits<S, void(R),
+ typename enable_if<
+ !submit_member<S, R>::is_valid
+ >::type,
+ typename enable_if<
+ !submit_free<S, R>::is_valid
+ >::type,
+ typename enable_if<
+ is_sender_to<S, R>::value
+ >::type>
+{
+ ASIO_STATIC_CONSTEXPR(overload_type, overload = adapter);
+ ASIO_STATIC_CONSTEXPR(bool, is_noexcept = false);
+ typedef void result_type;
+};
+
+struct impl
+{
+#if defined(ASIO_HAS_MOVE)
+ template <typename S, typename R>
+ ASIO_CONSTEXPR typename enable_if<
+ call_traits<S, void(R)>::overload == call_member,
+ typename call_traits<S, void(R)>::result_type
+ >::type
+ operator()(S&& s, R&& r) const
+ ASIO_NOEXCEPT_IF((
+ call_traits<S, void(R)>::is_noexcept))
+ {
+ return ASIO_MOVE_CAST(S)(s).submit(ASIO_MOVE_CAST(R)(r));
+ }
+
+ template <typename S, typename R>
+ ASIO_CONSTEXPR typename enable_if<
+ call_traits<S, void(R)>::overload == call_free,
+ typename call_traits<S, void(R)>::result_type
+ >::type
+ operator()(S&& s, R&& r) const
+ ASIO_NOEXCEPT_IF((
+ call_traits<S, void(R)>::is_noexcept))
+ {
+ return submit(ASIO_MOVE_CAST(S)(s), ASIO_MOVE_CAST(R)(r));
+ }
+
+ template <typename S, typename R>
+ ASIO_CONSTEXPR typename enable_if<
+ call_traits<S, void(R)>::overload == adapter,
+ typename call_traits<S, void(R)>::result_type
+ >::type
+ operator()(S&& s, R&& r) const
+ ASIO_NOEXCEPT_IF((
+ call_traits<S, void(R)>::is_noexcept))
+ {
+ return asio::execution::start(
+ (new asio::execution::detail::submit_receiver<S, R>(
+ ASIO_MOVE_CAST(S)(s), ASIO_MOVE_CAST(R)(r)))->state_);
+ }
+#else // defined(ASIO_HAS_MOVE)
+ template <typename S, typename R>
+ ASIO_CONSTEXPR typename enable_if<
+ call_traits<S&, void(R&)>::overload == call_member,
+ typename call_traits<S&, void(R&)>::result_type
+ >::type
+ operator()(S& s, R& r) const
+ ASIO_NOEXCEPT_IF((
+ call_traits<S&, void(R&)>::is_noexcept))
+ {
+ return s.submit(r);
+ }
+
+ template <typename S, typename R>
+ ASIO_CONSTEXPR typename enable_if<
+ call_traits<const S&, void(R&)>::overload == call_member,
+ typename call_traits<const S&, void(R&)>::result_type
+ >::type
+ operator()(const S& s, R& r) const
+ ASIO_NOEXCEPT_IF((
+ call_traits<const S&, void(R&)>::is_noexcept))
+ {
+ return s.submit(r);
+ }
+
+ template <typename S, typename R>
+ ASIO_CONSTEXPR typename enable_if<
+ call_traits<S&, void(R&)>::overload == call_free,
+ typename call_traits<S&, void(R&)>::result_type
+ >::type
+ operator()(S& s, R& r) const
+ ASIO_NOEXCEPT_IF((
+ call_traits<S&, void(R&)>::is_noexcept))
+ {
+ return submit(s, r);
+ }
+
+ template <typename S, typename R>
+ ASIO_CONSTEXPR typename enable_if<
+ call_traits<const S&, void(R&)>::overload == call_free,
+ typename call_traits<const S&, void(R&)>::result_type
+ >::type
+ operator()(const S& s, R& r) const
+ ASIO_NOEXCEPT_IF((
+ call_traits<const S&, void(R&)>::is_noexcept))
+ {
+ return submit(s, r);
+ }
+
+ template <typename S, typename R>
+ ASIO_CONSTEXPR typename enable_if<
+ call_traits<S&, void(R&)>::overload == adapter,
+ typename call_traits<S&, void(R&)>::result_type
+ >::type
+ operator()(S& s, R& r) const
+ ASIO_NOEXCEPT_IF((
+ call_traits<S&, void(R&)>::is_noexcept))
+ {
+ return asio::execution::start(
+ (new asio::execution::detail::submit_receiver<
+ S&, R&>(s, r))->state_);
+ }
+
+ template <typename S, typename R>
+ ASIO_CONSTEXPR typename enable_if<
+ call_traits<const S&, void(R&)>::overload == adapter,
+ typename call_traits<const S&, void(R&)>::result_type
+ >::type
+ operator()(const S& s, R& r) const
+ ASIO_NOEXCEPT_IF((
+ call_traits<const S&, void(R&)>::is_noexcept))
+ {
+ asio::execution::start(
+ (new asio::execution::detail::submit_receiver<
+ const S&, R&>(s, r))->state_);
+ }
+
+ template <typename S, typename R>
+ ASIO_CONSTEXPR typename enable_if<
+ call_traits<S&, void(const R&)>::overload == call_member,
+ typename call_traits<S&, void(const R&)>::result_type
+ >::type
+ operator()(S& s, const R& r) const
+ ASIO_NOEXCEPT_IF((
+ call_traits<S&, void(const R&)>::is_noexcept))
+ {
+ return s.submit(r);
+ }
+
+ template <typename S, typename R>
+ ASIO_CONSTEXPR typename enable_if<
+ call_traits<const S&, void(const R&)>::overload == call_member,
+ typename call_traits<const S&, void(const R&)>::result_type
+ >::type
+ operator()(const S& s, const R& r) const
+ ASIO_NOEXCEPT_IF((
+ call_traits<const S&, void(const R&)>::is_noexcept))
+ {
+ return s.submit(r);
+ }
+
+ template <typename S, typename R>
+ ASIO_CONSTEXPR typename enable_if<
+ call_traits<S&, void(const R&)>::overload == call_free,
+ typename call_traits<S&, void(const R&)>::result_type
+ >::type
+ operator()(S& s, const R& r) const
+ ASIO_NOEXCEPT_IF((
+ call_traits<S&, void(const R&)>::is_noexcept))
+ {
+ return submit(s, r);
+ }
+
+ template <typename S, typename R>
+ ASIO_CONSTEXPR typename enable_if<
+ call_traits<const S&, void(const R&)>::overload == call_free,
+ typename call_traits<const S&, void(const R&)>::result_type
+ >::type
+ operator()(const S& s, const R& r) const
+ ASIO_NOEXCEPT_IF((
+ call_traits<const S&, void(const R&)>::is_noexcept))
+ {
+ return submit(s, r);
+ }
+
+ template <typename S, typename R>
+ ASIO_CONSTEXPR typename enable_if<
+ call_traits<S&, void(const R&)>::overload == adapter,
+ typename call_traits<S&, void(const R&)>::result_type
+ >::type
+ operator()(S& s, const R& r) const
+ ASIO_NOEXCEPT_IF((
+ call_traits<S&, void(const R&)>::is_noexcept))
+ {
+ asio::execution::start(
+ (new asio::execution::detail::submit_receiver<
+ S&, const R&>(s, r))->state_);
+ }
+
+ template <typename S, typename R>
+ ASIO_CONSTEXPR typename enable_if<
+ call_traits<const S&, void(const R&)>::overload == adapter,
+ typename call_traits<const S&, void(const R&)>::result_type
+ >::type
+ operator()(const S& s, const R& r) const
+ ASIO_NOEXCEPT_IF((
+ call_traits<const S&, void(const R&)>::is_noexcept))
+ {
+ asio::execution::start(
+ (new asio::execution::detail::submit_receiver<
+ const S&, const R&>(s, r))->state_);
+ }
+#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_submit_fn
+namespace asio {
+namespace execution {
+namespace {
+
+static ASIO_CONSTEXPR const asio_execution_submit_fn::impl&
+ submit = asio_execution_submit_fn::static_instance<>::instance;
+
+} // namespace
+
+template <typename S, typename R>
+struct can_submit :
+ integral_constant<bool,
+ asio_execution_submit_fn::call_traits<S, void(R)>::overload !=
+ asio_execution_submit_fn::ill_formed>
+{
+};
+
+#if defined(ASIO_HAS_VARIABLE_TEMPLATES)
+
+template <typename S, typename R>
+constexpr bool can_submit_v = can_submit<S, R>::value;
+
+#endif // defined(ASIO_HAS_VARIABLE_TEMPLATES)
+
+template <typename S, typename R>
+struct is_nothrow_submit :
+ integral_constant<bool,
+ asio_execution_submit_fn::call_traits<S, void(R)>::is_noexcept>
+{
+};
+
+#if defined(ASIO_HAS_VARIABLE_TEMPLATES)
+
+template <typename S, typename R>
+constexpr bool is_nothrow_submit_v
+ = is_nothrow_submit<S, R>::value;
+
+#endif // defined(ASIO_HAS_VARIABLE_TEMPLATES)
+
+template <typename S, typename R>
+struct submit_result
+{
+ typedef typename asio_execution_submit_fn::call_traits<
+ S, void(R)>::result_type type;
+};
+
+namespace detail {
+
+template <typename S, typename R>
+void submit_helper(ASIO_MOVE_ARG(S) s, ASIO_MOVE_ARG(R) r)
+{
+ execution::submit(ASIO_MOVE_CAST(S)(s), ASIO_MOVE_CAST(R)(r));
+}
+
+} // namespace detail
+} // namespace execution
+} // namespace asio
+
+#endif // defined(GENERATING_DOCUMENTATION)
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_EXECUTION_SUBMIT_HPP