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+//
+// execution/receiver.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_RECEIVER_HPP
+#define ASIO_EXECUTION_RECEIVER_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/detail/variadic_templates.hpp"
+#include "asio/execution/set_done.hpp"
+#include "asio/execution/set_error.hpp"
+#include "asio/execution/set_value.hpp"
+
+#if defined(ASIO_HAS_STD_EXCEPTION_PTR)
+# include <exception>
+#else // defined(ASIO_HAS_STD_EXCEPTION_PTR)
+# include "asio/error_code.hpp"
+#endif // defined(ASIO_HAS_STD_EXCEPTION_PTR)
+
+#if defined(ASIO_HAS_DEDUCED_SET_DONE_FREE_TRAIT) \
+ && defined(ASIO_HAS_DEDUCED_SET_DONE_MEMBER_TRAIT) \
+ && defined(ASIO_HAS_DEDUCED_SET_ERROR_FREE_TRAIT) \
+ && defined(ASIO_HAS_DEDUCED_SET_ERROR_MEMBER_TRAIT) \
+ && defined(ASIO_HAS_DEDUCED_SET_VALUE_FREE_TRAIT) \
+ && defined(ASIO_HAS_DEDUCED_SET_VALUE_MEMBER_TRAIT) \
+ && defined(ASIO_HAS_DEDUCED_RECEIVER_OF_FREE_TRAIT) \
+ && defined(ASIO_HAS_DEDUCED_RECEIVER_OF_MEMBER_TRAIT)
+# define ASIO_HAS_DEDUCED_EXECUTION_IS_RECEIVER_TRAIT 1
+#endif // defined(ASIO_HAS_DEDUCED_SET_DONE_FREE_TRAIT)
+ // && defined(ASIO_HAS_DEDUCED_SET_DONE_MEMBER_TRAIT)
+ // && defined(ASIO_HAS_DEDUCED_SET_ERROR_FREE_TRAIT)
+ // && defined(ASIO_HAS_DEDUCED_SET_ERROR_MEMBER_TRAIT)
+ // && defined(ASIO_HAS_DEDUCED_SET_VALUE_FREE_TRAIT)
+ // && defined(ASIO_HAS_DEDUCED_SET_VALUE_MEMBER_TRAIT)
+ // && defined(ASIO_HAS_DEDUCED_RECEIVER_OF_FREE_TRAIT)
+ // && defined(ASIO_HAS_DEDUCED_RECEIVER_OF_MEMBER_TRAIT)
+
+#include "asio/detail/push_options.hpp"
+
+namespace asio {
+namespace execution {
+namespace detail {
+
+template <typename T, typename E>
+struct is_receiver_base :
+ integral_constant<bool,
+ is_move_constructible<typename remove_cvref<T>::type>::value
+ && is_constructible<typename remove_cvref<T>::type, T>::value
+ >
+{
+};
+
+} // namespace detail
+
+#if defined(ASIO_HAS_STD_EXCEPTION_PTR)
+# define ASIO_EXECUTION_RECEIVER_ERROR_DEFAULT = std::exception_ptr
+#else // defined(ASIO_HAS_STD_EXCEPTION_PTR)
+# define ASIO_EXECUTION_RECEIVER_ERROR_DEFAULT \
+ = ::asio::error_code
+#endif // defined(ASIO_HAS_STD_EXCEPTION_PTR)
+
+/// The is_receiver trait detects whether a type T satisfies the
+/// execution::receiver concept.
+/**
+ * Class template @c is_receiver is a type trait that is derived from @c
+ * true_type if the type @c T meets the concept definition for a receiver for
+ * error type @c E, otherwise @c false_type.
+ */
+template <typename T, typename E ASIO_EXECUTION_RECEIVER_ERROR_DEFAULT>
+struct is_receiver :
+#if defined(GENERATING_DOCUMENTATION)
+ integral_constant<bool, automatically_determined>
+#else // defined(GENERATING_DOCUMENTATION)
+ conditional<
+ can_set_done<typename remove_cvref<T>::type>::value
+ && is_nothrow_set_done<typename remove_cvref<T>::type>::value
+ && can_set_error<typename remove_cvref<T>::type, E>::value
+ && is_nothrow_set_error<typename remove_cvref<T>::type, E>::value,
+ detail::is_receiver_base<T, E>,
+ false_type
+ >::type
+#endif // defined(GENERATING_DOCUMENTATION)
+{
+};
+
+#if defined(ASIO_HAS_VARIABLE_TEMPLATES)
+
+template <typename T, typename E ASIO_EXECUTION_RECEIVER_ERROR_DEFAULT>
+ASIO_CONSTEXPR const bool is_receiver_v = is_receiver<T, E>::value;
+
+#endif // defined(ASIO_HAS_VARIABLE_TEMPLATES)
+
+#if defined(ASIO_HAS_CONCEPTS)
+
+template <typename T, typename E ASIO_EXECUTION_RECEIVER_ERROR_DEFAULT>
+ASIO_CONCEPT receiver = is_receiver<T, E>::value;
+
+#define ASIO_EXECUTION_RECEIVER ::asio::execution::receiver
+
+#else // defined(ASIO_HAS_CONCEPTS)
+
+#define ASIO_EXECUTION_RECEIVER typename
+
+#endif // defined(ASIO_HAS_CONCEPTS)
+
+#if defined(ASIO_HAS_VARIADIC_TEMPLATES) \
+ || defined(GENERATING_DOCUMENTATION)
+
+/// The is_receiver_of trait detects whether a type T satisfies the
+/// execution::receiver_of concept for some set of value arguments.
+/**
+ * Class template @c is_receiver_of is a type trait that is derived from @c
+ * true_type if the type @c T meets the concept definition for a receiver for
+ * value arguments @c Vs, otherwise @c false_type.
+ */
+template <typename T, typename... Vs>
+struct is_receiver_of :
+#if defined(GENERATING_DOCUMENTATION)
+ integral_constant<bool, automatically_determined>
+#else // defined(GENERATING_DOCUMENTATION)
+ conditional<
+ is_receiver<T>::value,
+ can_set_value<typename remove_cvref<T>::type, Vs...>,
+ false_type
+ >::type
+#endif // defined(GENERATING_DOCUMENTATION)
+{
+};
+
+#if defined(ASIO_HAS_VARIABLE_TEMPLATES)
+
+template <typename T, typename... Vs>
+ASIO_CONSTEXPR const bool is_receiver_of_v =
+ is_receiver_of<T, Vs...>::value;
+
+#endif // defined(ASIO_HAS_VARIABLE_TEMPLATES)
+
+#if defined(ASIO_HAS_CONCEPTS)
+
+template <typename T, typename... Vs>
+ASIO_CONCEPT receiver_of = is_receiver_of<T, Vs...>::value;
+
+#define ASIO_EXECUTION_RECEIVER_OF_0 \
+ ::asio::execution::receiver_of
+
+#define ASIO_EXECUTION_RECEIVER_OF_1(v) \
+ ::asio::execution::receiver_of<v>
+
+#else // defined(ASIO_HAS_CONCEPTS)
+
+#define ASIO_EXECUTION_RECEIVER_OF_0 typename
+#define ASIO_EXECUTION_RECEIVER_OF_1(v) typename
+
+#endif // defined(ASIO_HAS_CONCEPTS)
+
+#else // defined(ASIO_HAS_VARIADIC_TEMPLATES)
+ // || defined(GENERATING_DOCUMENTATION)
+
+template <typename T, typename = void,
+ typename = void, typename = void, typename = void, typename = void,
+ typename = void, typename = void, typename = void, typename = void>
+struct is_receiver_of;
+
+template <typename T>
+struct is_receiver_of<T> :
+ conditional<
+ is_receiver<T>::value,
+ can_set_value<typename remove_cvref<T>::type>,
+ false_type
+ >::type
+{
+};
+
+#define ASIO_PRIVATE_RECEIVER_OF_TRAITS_DEF(n) \
+ template <typename T, ASIO_VARIADIC_TPARAMS(n)> \
+ struct is_receiver_of<T, ASIO_VARIADIC_TARGS(n)> : \
+ conditional< \
+ conditional<true, is_receiver<T>, void>::type::value, \
+ can_set_value< \
+ typename remove_cvref<T>::type, \
+ ASIO_VARIADIC_TARGS(n)>, \
+ false_type \
+ >::type \
+ { \
+ }; \
+ /**/
+ASIO_VARIADIC_GENERATE(ASIO_PRIVATE_RECEIVER_OF_TRAITS_DEF)
+#undef ASIO_PRIVATE_RECEIVER_OF_TRAITS_DEF
+
+#define ASIO_EXECUTION_RECEIVER_OF_0 typename
+#define ASIO_EXECUTION_RECEIVER_OF_1(v) typename
+
+#endif // defined(ASIO_HAS_VARIADIC_TEMPLATES)
+ // || defined(GENERATING_DOCUMENTATION)
+
+#if defined(ASIO_HAS_VARIADIC_TEMPLATES) \
+ || defined(GENERATING_DOCUMENTATION)
+
+/// The is_nothrow_receiver_of trait detects whether a type T satisfies the
+/// execution::receiver_of concept for some set of value arguments, with a
+/// noexcept @c set_value operation.
+/**
+ * Class template @c is_nothrow_receiver_of is a type trait that is derived
+ * from @c true_type if the type @c T meets the concept definition for a
+ * receiver for value arguments @c Vs, and the expression
+ * <tt>execution::set_value(declval<T>(), declval<Ts>()...)</tt> is noexcept,
+ * otherwise @c false_type.
+ */
+template <typename T, typename... Vs>
+struct is_nothrow_receiver_of :
+#if defined(GENERATING_DOCUMENTATION)
+ integral_constant<bool, automatically_determined>
+#else // defined(GENERATING_DOCUMENTATION)
+ integral_constant<bool,
+ is_receiver_of<T, Vs...>::value
+ && is_nothrow_set_value<typename remove_cvref<T>::type, Vs...>::value
+ >
+#endif // defined(GENERATING_DOCUMENTATION)
+{
+};
+
+#if defined(ASIO_HAS_VARIABLE_TEMPLATES)
+
+template <typename T, typename... Vs>
+ASIO_CONSTEXPR const bool is_nothrow_receiver_of_v =
+ is_nothrow_receiver_of<T, Vs...>::value;
+
+#endif // defined(ASIO_HAS_VARIABLE_TEMPLATES)
+
+#else // defined(ASIO_HAS_VARIADIC_TEMPLATES)
+ // || defined(GENERATING_DOCUMENTATION)
+
+template <typename T, typename = void,
+ typename = void, typename = void, typename = void, typename = void,
+ typename = void, typename = void, typename = void, typename = void>
+struct is_nothrow_receiver_of;
+
+template <typename T>
+struct is_nothrow_receiver_of<T> :
+ integral_constant<bool,
+ is_receiver_of<T>::value
+ && is_nothrow_set_value<typename remove_cvref<T>::type>::value
+ >
+{
+};
+
+#define ASIO_PRIVATE_NOTHROW_RECEIVER_OF_TRAITS_DEF(n) \
+ template <typename T, ASIO_VARIADIC_TPARAMS(n)> \
+ struct is_nothrow_receiver_of<T, ASIO_VARIADIC_TARGS(n)> : \
+ integral_constant<bool, \
+ is_receiver_of<T, ASIO_VARIADIC_TARGS(n)>::value \
+ && is_nothrow_set_value<typename remove_cvref<T>::type, \
+ ASIO_VARIADIC_TARGS(n)>::value \
+ > \
+ { \
+ }; \
+ /**/
+ASIO_VARIADIC_GENERATE(ASIO_PRIVATE_NOTHROW_RECEIVER_OF_TRAITS_DEF)
+#undef ASIO_PRIVATE_NOTHROW_RECEIVER_OF_TRAITS_DEF
+
+#endif // defined(ASIO_HAS_VARIADIC_TEMPLATES)
+ // || defined(GENERATING_DOCUMENTATION)
+
+} // namespace execution
+} // namespace asio
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_EXECUTION_RECEIVER_HPP