--- /dev/null
+//
+// execution/set_value.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_VALUE_HPP
+#define BOOST_ASIO_EXECUTION_SET_VALUE_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/detail/variadic_templates.hpp>
+#include <boost/asio/traits/set_value_member.hpp>
+#include <boost/asio/traits/set_value_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 value to a receiver.
+/**
+ * The name <tt>execution::set_value</tt> denotes a customisation point object.
+ * The expression <tt>execution::set_value(R, Vs...)</tt> for some
+ * subexpressions <tt>R</tt> and <tt>Vs...</tt> is expression-equivalent to:
+ *
+ * @li <tt>R.set_value(Vs...)</tt>, if that expression is valid. If the
+ * function selected does not send the value(s) <tt>Vs...</tt> to the receiver
+ * <tt>R</tt>'s value channel, the program is ill-formed with no diagnostic
+ * required.
+ *
+ * @li Otherwise, <tt>set_value(R, Vs...)</tt>, if that expression is valid,
+ * with overload resolution performed in a context that includes the
+ * declaration <tt>void set_value();</tt> and that does not include a
+ * declaration of <tt>execution::set_value</tt>. If the function selected by
+ * overload resolution does not send the value(s) <tt>Vs...</tt> to the
+ * receiver <tt>R</tt>'s value channel, the program is ill-formed with no
+ * diagnostic required.
+ *
+ * @li Otherwise, <tt>execution::set_value(R, Vs...)</tt> is ill-formed.
+ */
+inline constexpr unspecified set_value = unspecified;
+
+/// A type trait that determines whether a @c set_value expression is
+/// well-formed.
+/**
+ * Class template @c can_set_value is a trait that is derived from
+ * @c true_type if the expression <tt>execution::set_value(std::declval<R>(),
+ * std::declval<Vs>()...)</tt> is well formed; otherwise @c false_type.
+ */
+template <typename R, typename... Vs>
+struct can_set_value :
+ integral_constant<bool, automatically_determined>
+{
+};
+
+} // namespace execution
+} // namespace asio
+} // namespace boost
+
+#else // defined(GENERATING_DOCUMENTATION)
+
+namespace asio_execution_set_value_fn {
+
+using boost::asio::decay;
+using boost::asio::declval;
+using boost::asio::enable_if;
+using boost::asio::traits::set_value_free;
+using boost::asio::traits::set_value_member;
+
+void set_value();
+
+enum overload_type
+{
+ call_member,
+ call_free,
+ ill_formed
+};
+
+template <typename R, typename Vs, 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, typename Vs>
+struct call_traits<R, Vs,
+ typename enable_if<
+ (
+ set_value_member<R, Vs>::is_valid
+ )
+ >::type> :
+ set_value_member<R, Vs>
+{
+ BOOST_ASIO_STATIC_CONSTEXPR(overload_type, overload = call_member);
+};
+
+template <typename R, typename Vs>
+struct call_traits<R, Vs,
+ typename enable_if<
+ (
+ !set_value_member<R, Vs>::is_valid
+ &&
+ set_value_free<R, Vs>::is_valid
+ )
+ >::type> :
+ set_value_free<R, Vs>
+{
+ BOOST_ASIO_STATIC_CONSTEXPR(overload_type, overload = call_free);
+};
+
+struct impl
+{
+#if defined(BOOST_ASIO_HAS_MOVE)
+
+#if defined(BOOST_ASIO_HAS_VARIADIC_TEMPLATES)
+
+ template <typename R, typename... Vs>
+ BOOST_ASIO_CONSTEXPR typename enable_if<
+ call_traits<R, void(Vs...)>::overload == call_member,
+ typename call_traits<R, void(Vs...)>::result_type
+ >::type
+ operator()(R&& r, Vs&&... v) const
+ BOOST_ASIO_NOEXCEPT_IF((
+ call_traits<R, void(Vs...)>::is_noexcept))
+ {
+ return BOOST_ASIO_MOVE_CAST(R)(r).set_value(BOOST_ASIO_MOVE_CAST(Vs)(v)...);
+ }
+
+ template <typename R, typename... Vs>
+ BOOST_ASIO_CONSTEXPR typename enable_if<
+ call_traits<R, void(Vs...)>::overload == call_free,
+ typename call_traits<R, void(Vs...)>::result_type
+ >::type
+ operator()(R&& r, Vs&&... v) const
+ BOOST_ASIO_NOEXCEPT_IF((
+ call_traits<R, void(Vs...)>::is_noexcept))
+ {
+ return set_value(BOOST_ASIO_MOVE_CAST(R)(r),
+ BOOST_ASIO_MOVE_CAST(Vs)(v)...);
+ }
+
+#else // defined(BOOST_ASIO_HAS_VARIADIC_TEMPLATES)
+
+ template <typename R>
+ BOOST_ASIO_CONSTEXPR typename enable_if<
+ call_traits<R, void()>::overload == call_member,
+ typename call_traits<R, void()>::result_type
+ >::type
+ operator()(R&& r) const
+ BOOST_ASIO_NOEXCEPT_IF((
+ call_traits<R, void()>::is_noexcept))
+ {
+ return BOOST_ASIO_MOVE_CAST(R)(r).set_value();
+ }
+
+ template <typename R>
+ BOOST_ASIO_CONSTEXPR typename enable_if<
+ call_traits<R, void()>::overload == call_free,
+ typename call_traits<R, void()>::result_type
+ >::type
+ operator()(R&& r) const
+ BOOST_ASIO_NOEXCEPT_IF((
+ call_traits<R, void()>::is_noexcept))
+ {
+ return set_value(BOOST_ASIO_MOVE_CAST(R)(r));
+ }
+
+#define BOOST_ASIO_PRIVATE_SET_VALUE_CALL_DEF(n) \
+ template <typename R, BOOST_ASIO_VARIADIC_TPARAMS(n)> \
+ BOOST_ASIO_CONSTEXPR typename enable_if< \
+ call_traits<R, \
+ void(BOOST_ASIO_VARIADIC_TARGS(n))>::overload == call_member, \
+ typename call_traits<R, void(BOOST_ASIO_VARIADIC_TARGS(n))>::result_type \
+ >::type \
+ operator()(R&& r, BOOST_ASIO_VARIADIC_MOVE_PARAMS(n)) const \
+ BOOST_ASIO_NOEXCEPT_IF(( \
+ call_traits<R, void(BOOST_ASIO_VARIADIC_TARGS(n))>::is_noexcept)) \
+ { \
+ return BOOST_ASIO_MOVE_CAST(R)(r).set_value( \
+ BOOST_ASIO_VARIADIC_MOVE_ARGS(n)); \
+ } \
+ \
+ template <typename R, BOOST_ASIO_VARIADIC_TPARAMS(n)> \
+ BOOST_ASIO_CONSTEXPR typename enable_if< \
+ call_traits<R, void(BOOST_ASIO_VARIADIC_TARGS(n))>::overload == call_free, \
+ typename call_traits<R, void(BOOST_ASIO_VARIADIC_TARGS(n))>::result_type \
+ >::type \
+ operator()(R&& r, BOOST_ASIO_VARIADIC_MOVE_PARAMS(n)) const \
+ BOOST_ASIO_NOEXCEPT_IF(( \
+ call_traits<R, void(BOOST_ASIO_VARIADIC_TARGS(n))>::is_noexcept)) \
+ { \
+ return set_value(BOOST_ASIO_MOVE_CAST(R)(r), \
+ BOOST_ASIO_VARIADIC_MOVE_ARGS(n)); \
+ } \
+ /**/
+BOOST_ASIO_VARIADIC_GENERATE(BOOST_ASIO_PRIVATE_SET_VALUE_CALL_DEF)
+#undef BOOST_ASIO_PRIVATE_SET_VALUE_CALL_DEF
+
+#endif // defined(BOOST_ASIO_HAS_VARIADIC_TEMPLATES)
+
+#else // defined(BOOST_ASIO_HAS_MOVE)
+
+#if defined(BOOST_ASIO_HAS_VARIADIC_TEMPLATES)
+
+ template <typename R, typename... Vs>
+ BOOST_ASIO_CONSTEXPR typename enable_if<
+ call_traits<R&, void(const Vs&...)>::overload == call_member,
+ typename call_traits<R&, void(const Vs&...)>::result_type
+ >::type
+ operator()(R& r, const Vs&... v) const
+ BOOST_ASIO_NOEXCEPT_IF((
+ call_traits<R&, void(const Vs&...)>::is_noexcept))
+ {
+ return r.set_value(v...);
+ }
+
+ template <typename R, typename... Vs>
+ BOOST_ASIO_CONSTEXPR typename enable_if<
+ call_traits<const R&, void(const Vs&...)>::overload == call_member,
+ typename call_traits<const R&, void(const Vs&...)>::result_type
+ >::type
+ operator()(const R& r, const Vs&... v) const
+ BOOST_ASIO_NOEXCEPT_IF((
+ call_traits<const R&, void(const Vs&...)>::is_noexcept))
+ {
+ return r.set_value(v...);
+ }
+
+ template <typename R, typename... Vs>
+ BOOST_ASIO_CONSTEXPR typename enable_if<
+ call_traits<R&, void(const Vs&...)>::overload == call_free,
+ typename call_traits<R&, void(const Vs&...)>::result_type
+ >::type
+ operator()(R& r, const Vs&... v) const
+ BOOST_ASIO_NOEXCEPT_IF((
+ call_traits<R&, void(const Vs&...)>::is_noexcept))
+ {
+ return set_value(r, v...);
+ }
+
+ template <typename R, typename... Vs>
+ BOOST_ASIO_CONSTEXPR typename enable_if<
+ call_traits<const R&, void(const Vs&...)>::overload == call_free,
+ typename call_traits<const R&, void(const Vs&...)>::result_type
+ >::type
+ operator()(const R& r, const Vs&... v) const
+ BOOST_ASIO_NOEXCEPT_IF((
+ call_traits<const R&, void(const Vs&...)>::is_noexcept))
+ {
+ return set_value(r, v...);
+ }
+
+#else // defined(BOOST_ASIO_HAS_VARIADIC_TEMPLATES)
+
+ template <typename R>
+ BOOST_ASIO_CONSTEXPR typename enable_if<
+ call_traits<R&, void()>::overload == call_member,
+ typename call_traits<R&, void()>::result_type
+ >::type
+ operator()(R& r) const
+ BOOST_ASIO_NOEXCEPT_IF((
+ call_traits<R&, void()>::is_noexcept))
+ {
+ return r.set_value();
+ }
+
+ template <typename R>
+ BOOST_ASIO_CONSTEXPR typename enable_if<
+ call_traits<const R&, void()>::overload == call_member,
+ typename call_traits<const R&, void()>::result_type
+ >::type
+ operator()(const R& r) const
+ BOOST_ASIO_NOEXCEPT_IF((
+ call_traits<const R&, void()>::is_noexcept))
+ {
+ return r.set_value();
+ }
+
+ template <typename R>
+ BOOST_ASIO_CONSTEXPR typename enable_if<
+ call_traits<R&, void()>::overload == call_free,
+ typename call_traits<R&, void()>::result_type
+ >::type
+ operator()(R& r) const
+ BOOST_ASIO_NOEXCEPT_IF((
+ call_traits<R&, void()>::is_noexcept))
+ {
+ return set_value(r);
+ }
+
+ template <typename R>
+ BOOST_ASIO_CONSTEXPR typename enable_if<
+ call_traits<const R&, void()>::overload == call_free,
+ typename call_traits<const R&, void()>::result_type
+ >::type
+ operator()(const R& r) const
+ BOOST_ASIO_NOEXCEPT_IF((
+ call_traits<const R&, void()>::is_noexcept))
+ {
+ return set_value(r);
+ }
+
+#define BOOST_ASIO_PRIVATE_SET_VALUE_CALL_DEF(n) \
+ template <typename R, BOOST_ASIO_VARIADIC_TPARAMS(n)> \
+ BOOST_ASIO_CONSTEXPR typename enable_if< \
+ call_traits<R&, \
+ void(BOOST_ASIO_VARIADIC_TARGS(n))>::overload == call_member, \
+ typename call_traits<R&, void(BOOST_ASIO_VARIADIC_TARGS(n))>::result_type \
+ >::type \
+ operator()(R& r, BOOST_ASIO_VARIADIC_MOVE_PARAMS(n)) const \
+ BOOST_ASIO_NOEXCEPT_IF(( \
+ call_traits<R&, void(BOOST_ASIO_VARIADIC_TARGS(n))>::is_noexcept)) \
+ { \
+ return r.set_value(BOOST_ASIO_VARIADIC_MOVE_ARGS(n)); \
+ } \
+ \
+ template <typename R, BOOST_ASIO_VARIADIC_TPARAMS(n)> \
+ BOOST_ASIO_CONSTEXPR typename enable_if< \
+ call_traits<const R&, \
+ void(BOOST_ASIO_VARIADIC_TARGS(n))>::overload == call_member, \
+ typename call_traits<const R&, \
+ void(BOOST_ASIO_VARIADIC_TARGS(n))>::result_type \
+ >::type \
+ operator()(const R& r, BOOST_ASIO_VARIADIC_MOVE_PARAMS(n)) const \
+ BOOST_ASIO_NOEXCEPT_IF(( \
+ call_traits<const R&, void(BOOST_ASIO_VARIADIC_TARGS(n))>::is_noexcept)) \
+ { \
+ return r.set_value(BOOST_ASIO_VARIADIC_MOVE_ARGS(n)); \
+ } \
+ \
+ template <typename R, BOOST_ASIO_VARIADIC_TPARAMS(n)> \
+ BOOST_ASIO_CONSTEXPR typename enable_if< \
+ call_traits<R&, \
+ void(BOOST_ASIO_VARIADIC_TARGS(n))>::overload == call_free, \
+ typename call_traits<R&, void(BOOST_ASIO_VARIADIC_TARGS(n))>::result_type \
+ >::type \
+ operator()(R& r, BOOST_ASIO_VARIADIC_MOVE_PARAMS(n)) const \
+ BOOST_ASIO_NOEXCEPT_IF(( \
+ call_traits<R&, void(BOOST_ASIO_VARIADIC_TARGS(n))>::is_noexcept)) \
+ { \
+ return set_value(r, BOOST_ASIO_VARIADIC_MOVE_ARGS(n)); \
+ } \
+ \
+ template <typename R, BOOST_ASIO_VARIADIC_TPARAMS(n)> \
+ BOOST_ASIO_CONSTEXPR typename enable_if< \
+ call_traits<const R&, \
+ void(BOOST_ASIO_VARIADIC_TARGS(n))>::overload == call_free, \
+ typename call_traits<const R&, \
+ void(BOOST_ASIO_VARIADIC_TARGS(n))>::result_type \
+ >::type \
+ operator()(const R& r, BOOST_ASIO_VARIADIC_MOVE_PARAMS(n)) const \
+ BOOST_ASIO_NOEXCEPT_IF(( \
+ call_traits<const R&, void(BOOST_ASIO_VARIADIC_TARGS(n))>::is_noexcept)) \
+ { \
+ return set_value(r, BOOST_ASIO_VARIADIC_MOVE_ARGS(n)); \
+ } \
+ /**/
+BOOST_ASIO_VARIADIC_GENERATE(BOOST_ASIO_PRIVATE_SET_VALUE_CALL_DEF)
+#undef BOOST_ASIO_PRIVATE_SET_VALUE_CALL_DEF
+
+#endif // defined(BOOST_ASIO_HAS_VARIADIC_TEMPLATES)
+
+#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_value_fn
+namespace boost {
+namespace asio {
+namespace execution {
+namespace {
+
+static BOOST_ASIO_CONSTEXPR const asio_execution_set_value_fn::impl&
+ set_value = asio_execution_set_value_fn::static_instance<>::instance;
+
+} // namespace
+
+#if defined(BOOST_ASIO_HAS_VARIADIC_TEMPLATES)
+
+template <typename R, typename... Vs>
+struct can_set_value :
+ integral_constant<bool,
+ asio_execution_set_value_fn::call_traits<R, void(Vs...)>::overload !=
+ asio_execution_set_value_fn::ill_formed>
+{
+};
+
+#if defined(BOOST_ASIO_HAS_VARIABLE_TEMPLATES)
+
+template <typename R, typename... Vs>
+constexpr bool can_set_value_v = can_set_value<R, Vs...>::value;
+
+#endif // defined(BOOST_ASIO_HAS_VARIABLE_TEMPLATES)
+
+template <typename R, typename... Vs>
+struct is_nothrow_set_value :
+ integral_constant<bool,
+ asio_execution_set_value_fn::call_traits<R, void(Vs...)>::is_noexcept>
+{
+};
+
+#if defined(BOOST_ASIO_HAS_VARIABLE_TEMPLATES)
+
+template <typename R, typename... Vs>
+constexpr bool is_nothrow_set_value_v
+ = is_nothrow_set_value<R, Vs...>::value;
+
+#endif // defined(BOOST_ASIO_HAS_VARIABLE_TEMPLATES)
+
+#else // defined(BOOST_ASIO_HAS_VARIADIC_TEMPLATES)
+
+template <typename R, typename = void,
+ typename = void, typename = void, typename = void, typename = void,
+ typename = void, typename = void, typename = void, typename = void>
+struct can_set_value;
+
+template <typename R, typename = void,
+ typename = void, typename = void, typename = void, typename = void,
+ typename = void, typename = void, typename = void, typename = void>
+struct is_nothrow_set_value;
+
+template <typename R>
+struct can_set_value<R> :
+ integral_constant<bool,
+ asio_execution_set_value_fn::call_traits<R, void()>::overload !=
+ asio_execution_set_value_fn::ill_formed>
+{
+};
+
+template <typename R>
+struct is_nothrow_set_value<R> :
+ integral_constant<bool,
+ asio_execution_set_value_fn::call_traits<R, void()>::is_noexcept>
+{
+};
+
+#define BOOST_ASIO_PRIVATE_SET_VALUE_TRAITS_DEF(n) \
+ template <typename R, BOOST_ASIO_VARIADIC_TPARAMS(n)> \
+ struct can_set_value<R, BOOST_ASIO_VARIADIC_TARGS(n)> : \
+ integral_constant<bool, \
+ asio_execution_set_value_fn::call_traits<R, \
+ void(BOOST_ASIO_VARIADIC_TARGS(n))>::overload != \
+ asio_execution_set_value_fn::ill_formed> \
+ { \
+ }; \
+ \
+ template <typename R, BOOST_ASIO_VARIADIC_TPARAMS(n)> \
+ struct is_nothrow_set_value<R, BOOST_ASIO_VARIADIC_TARGS(n)> : \
+ integral_constant<bool, \
+ asio_execution_set_value_fn::call_traits<R, \
+ void(BOOST_ASIO_VARIADIC_TARGS(n))>::is_noexcept> \
+ { \
+ }; \
+ /**/
+BOOST_ASIO_VARIADIC_GENERATE(BOOST_ASIO_PRIVATE_SET_VALUE_TRAITS_DEF)
+#undef BOOST_ASIO_PRIVATE_SET_VALUE_TRAITS_DEF
+
+#endif // defined(BOOST_ASIO_HAS_VARIADIC_TEMPLATES)
+
+} // namespace execution
+} // namespace asio
+} // namespace boost
+
+#endif // defined(GENERATING_DOCUMENTATION)
+
+#include <boost/asio/detail/pop_options.hpp>
+
+#endif // BOOST_ASIO_EXECUTION_SET_VALUE_HPP
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