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+//
+// impl/detached.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_IMPL_DETACHED_HPP
+#define ASIO_IMPL_DETACHED_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/config.hpp"
+#include "asio/async_result.hpp"
+#include "asio/detail/variadic_templates.hpp"
+
+#include "asio/detail/push_options.hpp"
+
+namespace asio {
+namespace detail {
+
+ // Class to adapt a detached_t as a completion handler.
+ class detached_handler
+ {
+ public:
+ typedef void result_type;
+
+ detached_handler(detached_t)
+ {
+ }
+
+#if defined(ASIO_HAS_VARIADIC_TEMPLATES)
+
+ template <typename... Args>
+ void operator()(Args...)
+ {
+ }
+
+#else // defined(ASIO_HAS_VARIADIC_TEMPLATES)
+
+ void operator()()
+ {
+ }
+
+#define ASIO_PRIVATE_DETACHED_DEF(n) \
+ template <ASIO_VARIADIC_TPARAMS(n)> \
+ void operator()(ASIO_VARIADIC_TARGS(n)) \
+ { \
+ } \
+ /**/
+ ASIO_VARIADIC_GENERATE(ASIO_PRIVATE_DETACHED_DEF)
+#undef ASIO_PRIVATE_DETACHED_DEF
+
+#endif // defined(ASIO_HAS_VARIADIC_TEMPLATES)
+ };
+
+} // namespace detail
+
+#if !defined(GENERATING_DOCUMENTATION)
+
+template <typename Signature>
+struct async_result<detached_t, Signature>
+{
+ typedef asio::detail::detached_handler completion_handler_type;
+
+ typedef void return_type;
+
+ explicit async_result(completion_handler_type&)
+ {
+ }
+
+ void get()
+ {
+ }
+
+#if defined(ASIO_HAS_VARIADIC_TEMPLATES)
+
+ template <typename Initiation, typename RawCompletionToken, typename... Args>
+ static return_type initiate(
+ ASIO_MOVE_ARG(Initiation) initiation,
+ ASIO_MOVE_ARG(RawCompletionToken),
+ ASIO_MOVE_ARG(Args)... args)
+ {
+ ASIO_MOVE_CAST(Initiation)(initiation)(
+ detail::detached_handler(detached_t()),
+ ASIO_MOVE_CAST(Args)(args)...);
+ }
+
+#else // defined(ASIO_HAS_VARIADIC_TEMPLATES)
+
+ template <typename Initiation, typename RawCompletionToken>
+ static return_type initiate(
+ ASIO_MOVE_ARG(Initiation) initiation,
+ ASIO_MOVE_ARG(RawCompletionToken))
+ {
+ ASIO_MOVE_CAST(Initiation)(initiation)(
+ detail::detached_handler(detached_t()));
+ }
+
+#define ASIO_PRIVATE_INITIATE_DEF(n) \
+ template <typename Initiation, typename RawCompletionToken, \
+ ASIO_VARIADIC_TPARAMS(n)> \
+ static return_type initiate( \
+ ASIO_MOVE_ARG(Initiation) initiation, \
+ ASIO_MOVE_ARG(RawCompletionToken), \
+ ASIO_VARIADIC_MOVE_PARAMS(n)) \
+ { \
+ ASIO_MOVE_CAST(Initiation)(initiation)( \
+ detail::detached_handler(detached_t()), \
+ ASIO_VARIADIC_MOVE_ARGS(n)); \
+ } \
+ /**/
+ ASIO_VARIADIC_GENERATE(ASIO_PRIVATE_INITIATE_DEF)
+#undef ASIO_PRIVATE_INITIATE_DEF
+
+#endif // defined(ASIO_HAS_VARIADIC_TEMPLATES)
+};
+
+#endif // !defined(GENERATING_DOCUMENTATION)
+
+} // namespace asio
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_IMPL_DETACHED_HPP