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diff --git a/lib/asio/detail/work_dispatcher.hpp b/lib/asio/detail/work_dispatcher.hpp
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+++ b/lib/asio/detail/work_dispatcher.hpp
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+//
+// detail/work_dispatcher.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 ASIO_DETAIL_WORK_DISPATCHER_HPP
+#define ASIO_DETAIL_WORK_DISPATCHER_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/config.hpp"
+#include "asio/associated_executor.hpp"
+#include "asio/associated_allocator.hpp"
+#include "asio/executor_work_guard.hpp"
+
+#include "asio/detail/push_options.hpp"
+
+namespace asio {
+namespace detail {
+
+template <typename Handler>
+class work_dispatcher
+{
+public:
+  work_dispatcher(Handler& handler)
+    : work_((get_associated_executor)(handler)),
+      handler_(ASIO_MOVE_CAST(Handler)(handler))
+  {
+  }
+
+#if defined(ASIO_HAS_MOVE)
+  work_dispatcher(const work_dispatcher& other)
+    : work_(other.work_),
+      handler_(other.handler_)
+  {
+  }
+
+  work_dispatcher(work_dispatcher&& other)
+    : work_(ASIO_MOVE_CAST(executor_work_guard<
+        typename associated_executor<Handler>::type>)(other.work_)),
+      handler_(ASIO_MOVE_CAST(Handler)(other.handler_))
+  {
+  }
+#endif // defined(ASIO_HAS_MOVE)
+
+  void operator()()
+  {
+    typename associated_allocator<Handler>::type alloc(
+        (get_associated_allocator)(handler_));
+    work_.get_executor().dispatch(
+        ASIO_MOVE_CAST(Handler)(handler_), alloc);
+    work_.reset();
+  }
+
+private:
+  executor_work_guard<typename associated_executor<Handler>::type> work_;
+  Handler handler_;
+};
+
+} // namespace detail
+} // namespace asio
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_DETAIL_WORK_DISPATCHER_HPP