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diff --git a/boost/asio/experimental/impl/detached.hpp b/boost/asio/experimental/impl/detached.hpp
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+//
+// experimental/impl/detached.hpp
+// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2018 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_EXPERIMENTAL_IMPL_DETACHED_HPP
+#define BOOST_ASIO_EXPERIMENTAL_IMPL_DETACHED_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/async_result.hpp>
+#include <boost/asio/detail/variadic_templates.hpp>
+#include <boost/asio/handler_type.hpp>
+#include <boost/system/system_error.hpp>
+
+#include <boost/asio/detail/push_options.hpp>
+
+namespace boost {
+namespace asio {
+namespace experimental {
+namespace detail {
+
+  // Class to adapt a detached_t as a completion handler.
+  class detached_handler
+  {
+  public:
+    detached_handler(detached_t)
+    {
+    }
+
+#if defined(BOOST_ASIO_HAS_VARIADIC_TEMPLATES)
+
+    template <typename... Args>
+    void operator()(Args...)
+    {
+    }
+
+#else // defined(BOOST_ASIO_HAS_VARIADIC_TEMPLATES)
+
+    void operator()()
+    {
+    }
+
+#define BOOST_ASIO_PRIVATE_DETACHED_DEF(n) \
+    template <BOOST_ASIO_VARIADIC_TPARAMS(n)> \
+    void operator()(BOOST_ASIO_VARIADIC_BYVAL_PARAMS(n)) \
+    { \
+    } \
+    /**/
+    BOOST_ASIO_VARIADIC_GENERATE(BOOST_ASIO_PRIVATE_DETACHED_DEF)
+#undef BOOST_ASIO_PRIVATE_DETACHED_DEF
+
+#endif // defined(BOOST_ASIO_HAS_VARIADIC_TEMPLATES)
+  };
+
+} // namespace detail
+} // namespace experimental
+
+#if !defined(GENERATING_DOCUMENTATION)
+
+template <typename Signature>
+struct async_result<experimental::detached_t, Signature>
+{
+  typedef boost::asio::experimental::detail::detached_handler
+    completion_handler_type;
+
+  typedef void return_type;
+
+  explicit async_result(completion_handler_type&)
+  {
+  }
+
+  void get()
+  {
+  }
+};
+
+#endif // !defined(GENERATING_DOCUMENTATION)
+
+} // namespace asio
+} // namespace boost
+
+#include <boost/asio/detail/pop_options.hpp>
+
+#endif // BOOST_ASIO_EXPERIMENTAL_IMPL_DETACHED_HPP