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diff --git a/lib/asio/detail/reactor_op.hpp b/lib/asio/detail/reactor_op.hpp
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+++ b/lib/asio/detail/reactor_op.hpp
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+//
+// detail/reactor_op.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_REACTOR_OP_HPP
+#define ASIO_DETAIL_REACTOR_OP_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/operation.hpp"
+
+#include "asio/detail/push_options.hpp"
+
+namespace asio {
+namespace detail {
+
+class reactor_op
+  : public operation
+{
+public:
+  // The error code to be passed to the completion handler.
+  asio::error_code ec_;
+
+  // The number of bytes transferred, to be passed to the completion handler.
+  std::size_t bytes_transferred_;
+
+  // Status returned by perform function. May be used to decide whether it is
+  // worth performing more operations on the descriptor immediately.
+  enum status { not_done, done, done_and_exhausted };
+
+  // Perform the operation. Returns true if it is finished.
+  status perform()
+  {
+    return perform_func_(this);
+  }
+
+protected:
+  typedef status (*perform_func_type)(reactor_op*);
+
+  reactor_op(perform_func_type perform_func, func_type complete_func)
+    : operation(complete_func),
+      bytes_transferred_(0),
+      perform_func_(perform_func)
+  {
+  }
+
+private:
+  perform_func_type perform_func_;
+};
+
+} // namespace detail
+} // namespace asio
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_DETAIL_REACTOR_OP_HPP