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+//
+// packaged_task.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_PACKAGED_TASK_HPP
+#define ASIO_PACKAGED_TASK_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/future.hpp"
+
+#if defined(ASIO_HAS_STD_FUTURE_CLASS) \
+ || defined(GENERATING_DOCUMENTATION)
+
+#include "asio/async_result.hpp"
+#include "asio/detail/type_traits.hpp"
+#include "asio/detail/variadic_templates.hpp"
+
+#include "asio/detail/push_options.hpp"
+
+namespace asio {
+
+#if defined(ASIO_HAS_VARIADIC_TEMPLATES) \
+ || defined(GENERATING_DOCUMENTATION)
+
+/// Partial specialisation of @c async_result for @c std::packaged_task.
+template <typename Result, typename... Args, typename Signature>
+class async_result<std::packaged_task<Result(Args...)>, Signature>
+{
+public:
+ /// The packaged task is the concrete completion handler type.
+ typedef std::packaged_task<Result(Args...)> completion_handler_type;
+
+ /// The return type of the initiating function is the future obtained from
+ /// the packaged task.
+ typedef std::future<Result> return_type;
+
+ /// The constructor extracts the future from the packaged task.
+ explicit async_result(completion_handler_type& h)
+ : future_(h.get_future())
+ {
+ }
+
+ /// Returns the packaged task's future.
+ return_type get()
+ {
+ return std::move(future_);
+ }
+
+private:
+ return_type future_;
+};
+
+#else // defined(ASIO_HAS_VARIADIC_TEMPLATES)
+ // || defined(GENERATING_DOCUMENTATION)
+
+template <typename Result, typename Signature>
+struct async_result<std::packaged_task<Result()>, Signature>
+{
+ typedef std::packaged_task<Result()> completion_handler_type;
+ typedef std::future<Result> return_type;
+
+ explicit async_result(completion_handler_type& h)
+ : future_(h.get_future())
+ {
+ }
+
+ return_type get()
+ {
+ return std::move(future_);
+ }
+
+private:
+ return_type future_;
+};
+
+#define ASIO_PRIVATE_ASYNC_RESULT_DEF(n) \
+ template <typename Result, \
+ ASIO_VARIADIC_TPARAMS(n), typename Signature> \
+ class async_result< \
+ std::packaged_task<Result(ASIO_VARIADIC_TARGS(n))>, Signature> \
+ { \
+ public: \
+ typedef std::packaged_task< \
+ Result(ASIO_VARIADIC_TARGS(n))> \
+ completion_handler_type; \
+ \
+ typedef std::future<Result> return_type; \
+ \
+ explicit async_result(completion_handler_type& h) \
+ : future_(h.get_future()) \
+ { \
+ } \
+ \
+ return_type get() \
+ { \
+ return std::move(future_); \
+ } \
+ \
+ private: \
+ return_type future_; \
+ }; \
+ /**/
+ ASIO_VARIADIC_GENERATE(ASIO_PRIVATE_ASYNC_RESULT_DEF)
+#undef ASIO_PRIVATE_ASYNC_RESULT_DEF
+
+#endif // defined(ASIO_HAS_VARIADIC_TEMPLATES)
+ // || defined(GENERATING_DOCUMENTATION)
+
+} // namespace asio
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // defined(ASIO_HAS_STD_FUTURE_CLASS)
+ // || defined(GENERATING_DOCUMENTATION)
+
+#endif // ASIO_PACKAGED_TASK_HPP