--- /dev/null
+//
+// execution/set_done.hpp
+// ~~~~~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2020 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 BOOST_ASIO_EXECUTION_SET_DONE_HPP
+#define BOOST_ASIO_EXECUTION_SET_DONE_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include <boost/asio/detail/config.hpp>
+#include <boost/asio/detail/type_traits.hpp>
+#include <boost/asio/traits/set_done_member.hpp>
+#include <boost/asio/traits/set_done_free.hpp>
+
+#include <boost/asio/detail/push_options.hpp>
+
+#if defined(GENERATING_DOCUMENTATION)
+
+namespace boost {
+namespace asio {
+namespace execution {
+
+/// A customisation point that delivers a done notification to a receiver.
+/**
+ * The name <tt>execution::set_done</tt> denotes a customisation point object.
+ * The expression <tt>execution::set_done(R)</tt> for some subexpression
+ * <tt>R</tt> is expression-equivalent to:
+ *
+ * @li <tt>R.set_done()</tt>, if that expression is valid. If the function
+ * selected does not signal the receiver <tt>R</tt>'s done channel, the
+ * program is ill-formed with no diagnostic required.
+ *
+ * @li Otherwise, <tt>set_done(R)</tt>, if that expression is valid, with
+ * overload resolution performed in a context that includes the declaration
+ * <tt>void set_done();</tt> and that does not include a declaration of
+ * <tt>execution::set_done</tt>. If the function selected by overload
+ * resolution does not signal the receiver <tt>R</tt>'s done channel, the
+ * program is ill-formed with no diagnostic required.
+ *
+ * @li Otherwise, <tt>execution::set_done(R)</tt> is ill-formed.
+ */
+inline constexpr unspecified set_done = unspecified;
+
+/// A type trait that determines whether a @c set_done expression is
+/// well-formed.
+/**
+ * Class template @c can_set_done is a trait that is derived from
+ * @c true_type if the expression <tt>execution::set_done(std::declval<R>(),
+ * std::declval<E>())</tt> is well formed; otherwise @c false_type.
+ */
+template <typename R>
+struct can_set_done :
+ integral_constant<bool, automatically_determined>
+{
+};
+
+} // namespace execution
+} // namespace asio
+} // namespace boost
+
+#else // defined(GENERATING_DOCUMENTATION)
+
+namespace asio_execution_set_done_fn {
+
+using boost::asio::decay;
+using boost::asio::declval;
+using boost::asio::enable_if;
+using boost::asio::traits::set_done_free;
+using boost::asio::traits::set_done_member;
+
+void set_done();
+
+enum overload_type
+{
+ call_member,
+ call_free,
+ ill_formed
+};
+
+template <typename R, typename = void>
+struct call_traits
+{
+ BOOST_ASIO_STATIC_CONSTEXPR(overload_type, overload = ill_formed);
+ BOOST_ASIO_STATIC_CONSTEXPR(bool, is_noexcept = false);
+ typedef void result_type;
+};
+
+template <typename R>
+struct call_traits<R,
+ typename enable_if<
+ (
+ set_done_member<R>::is_valid
+ )
+ >::type> :
+ set_done_member<R>
+{
+ BOOST_ASIO_STATIC_CONSTEXPR(overload_type, overload = call_member);
+};
+
+template <typename R>
+struct call_traits<R,
+ typename enable_if<
+ (
+ !set_done_member<R>::is_valid
+ &&
+ set_done_free<R>::is_valid
+ )
+ >::type> :
+ set_done_free<R>
+{
+ BOOST_ASIO_STATIC_CONSTEXPR(overload_type, overload = call_free);
+};
+
+struct impl
+{
+#if defined(BOOST_ASIO_HAS_MOVE)
+ template <typename R>
+ BOOST_ASIO_CONSTEXPR typename enable_if<
+ call_traits<R>::overload == call_member,
+ typename call_traits<R>::result_type
+ >::type
+ operator()(R&& r) const
+ BOOST_ASIO_NOEXCEPT_IF((
+ call_traits<R>::is_noexcept))
+ {
+ return BOOST_ASIO_MOVE_CAST(R)(r).set_done();
+ }
+
+ template <typename R>
+ BOOST_ASIO_CONSTEXPR typename enable_if<
+ call_traits<R>::overload == call_free,
+ typename call_traits<R>::result_type
+ >::type
+ operator()(R&& r) const
+ BOOST_ASIO_NOEXCEPT_IF((
+ call_traits<R>::is_noexcept))
+ {
+ return set_done(BOOST_ASIO_MOVE_CAST(R)(r));
+ }
+#else // defined(BOOST_ASIO_HAS_MOVE)
+ template <typename R>
+ BOOST_ASIO_CONSTEXPR typename enable_if<
+ call_traits<R&>::overload == call_member,
+ typename call_traits<R&>::result_type
+ >::type
+ operator()(R& r) const
+ BOOST_ASIO_NOEXCEPT_IF((
+ call_traits<R&>::is_noexcept))
+ {
+ return r.set_done();
+ }
+
+ template <typename R>
+ BOOST_ASIO_CONSTEXPR typename enable_if<
+ call_traits<const R&>::overload == call_member,
+ typename call_traits<const R&>::result_type
+ >::type
+ operator()(const R& r) const
+ BOOST_ASIO_NOEXCEPT_IF((
+ call_traits<const R&>::is_noexcept))
+ {
+ return r.set_done();
+ }
+
+ template <typename R>
+ BOOST_ASIO_CONSTEXPR typename enable_if<
+ call_traits<R&>::overload == call_free,
+ typename call_traits<R&>::result_type
+ >::type
+ operator()(R& r) const
+ BOOST_ASIO_NOEXCEPT_IF((
+ call_traits<R&>::is_noexcept))
+ {
+ return set_done(r);
+ }
+
+ template <typename R>
+ BOOST_ASIO_CONSTEXPR typename enable_if<
+ call_traits<const R&>::overload == call_free,
+ typename call_traits<const R&>::result_type
+ >::type
+ operator()(const R& r) const
+ BOOST_ASIO_NOEXCEPT_IF((
+ call_traits<const R&>::is_noexcept))
+ {
+ return set_done(r);
+ }
+#endif // defined(BOOST_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_set_done_fn
+namespace boost {
+namespace asio {
+namespace execution {
+namespace {
+
+static BOOST_ASIO_CONSTEXPR const asio_execution_set_done_fn::impl&
+ set_done = asio_execution_set_done_fn::static_instance<>::instance;
+
+} // namespace
+
+template <typename R>
+struct can_set_done :
+ integral_constant<bool,
+ asio_execution_set_done_fn::call_traits<R>::overload !=
+ asio_execution_set_done_fn::ill_formed>
+{
+};
+
+#if defined(BOOST_ASIO_HAS_VARIABLE_TEMPLATES)
+
+template <typename R>
+constexpr bool can_set_done_v = can_set_done<R>::value;
+
+#endif // defined(BOOST_ASIO_HAS_VARIABLE_TEMPLATES)
+
+template <typename R>
+struct is_nothrow_set_done :
+ integral_constant<bool,
+ asio_execution_set_done_fn::call_traits<R>::is_noexcept>
+{
+};
+
+#if defined(BOOST_ASIO_HAS_VARIABLE_TEMPLATES)
+
+template <typename R>
+constexpr bool is_nothrow_set_done_v
+ = is_nothrow_set_done<R>::value;
+
+#endif // defined(BOOST_ASIO_HAS_VARIABLE_TEMPLATES)
+
+} // namespace execution
+} // namespace asio
+} // namespace boost
+
+#endif // defined(GENERATING_DOCUMENTATION)
+
+#include <boost/asio/detail/pop_options.hpp>
+
+#endif // BOOST_ASIO_EXECUTION_SET_DONE_HPP
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