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diff --git a/boost/asio/detail/task_io_service_operation.hpp b/boost/asio/detail/task_io_service_operation.hpp
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+++ b/boost/asio/detail/task_io_service_operation.hpp
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+//
+// detail/task_io_service_operation.hpp
+// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2012 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_DETAIL_TASK_IO_SERVICE_OPERATION_HPP
+#define BOOST_ASIO_DETAIL_TASK_IO_SERVICE_OPERATION_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include <boost/system/error_code.hpp>
+#include <boost/asio/detail/handler_tracking.hpp>
+#include <boost/asio/detail/op_queue.hpp>
+#include <boost/asio/detail/task_io_service_fwd.hpp>
+
+#include <boost/asio/detail/push_options.hpp>
+
+namespace boost {
+namespace asio {
+namespace detail {
+
+// Base class for all operations. A function pointer is used instead of virtual
+// functions to avoid the associated overhead.
+class task_io_service_operation BOOST_ASIO_INHERIT_TRACKED_HANDLER
+{
+public:
+  void complete(task_io_service& owner,
+      const boost::system::error_code& ec, std::size_t bytes_transferred)
+  {
+    func_(&owner, this, ec, bytes_transferred);
+  }
+
+  void destroy()
+  {
+    func_(0, this, boost::system::error_code(), 0);
+  }
+
+protected:
+  typedef void (*func_type)(task_io_service*,
+      task_io_service_operation*,
+      const boost::system::error_code&, std::size_t);
+
+  task_io_service_operation(func_type func)
+    : next_(0),
+      func_(func),
+      task_result_(0)
+  {
+  }
+
+  // Prevents deletion through this type.
+  ~task_io_service_operation()
+  {
+  }
+
+private:
+  friend class op_queue_access;
+  task_io_service_operation* next_;
+  func_type func_;
+protected:
+  friend class task_io_service;
+  unsigned int task_result_; // Passed into bytes transferred.
+};
+
+} // namespace detail
+} // namespace asio
+} // namespace boost
+
+#include <boost/asio/detail/pop_options.hpp>
+
+#endif // BOOST_ASIO_DETAIL_TASK_IO_SERVICE_OPERATION_HPP