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diff --git a/ext/boost/asio/detail/timer_queue_base.hpp b/ext/boost/asio/detail/timer_queue_base.hpp
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+++ b/ext/boost/asio/detail/timer_queue_base.hpp
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+//
+// timer_queue_base.hpp
+// ~~~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2008 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_TIMER_QUEUE_BASE_HPP
+#define BOOST_ASIO_DETAIL_TIMER_QUEUE_BASE_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include <boost/asio/detail/push_options.hpp>
+
+#include <boost/asio/detail/socket_types.hpp> // Must come before posix_time.
+
+#include <boost/asio/detail/push_options.hpp>
+#include <boost/date_time/posix_time/posix_time_types.hpp>
+#include <boost/asio/detail/pop_options.hpp>
+
+#include <boost/asio/detail/noncopyable.hpp>
+
+namespace boost {
+namespace asio {
+namespace detail {
+
+class timer_queue_base
+  : private noncopyable
+{
+public:
+  // Destructor.
+  virtual ~timer_queue_base() {}
+
+  // Whether there are no timers in the queue.
+  virtual bool empty() const = 0;
+
+  // Get the time to wait until the next timer.
+  virtual boost::posix_time::time_duration wait_duration() const = 0;
+
+  // Dispatch all ready timers.
+  virtual void dispatch_timers() = 0;
+
+  // Dispatch any pending cancels for timers.
+  virtual void dispatch_cancellations() = 0;
+
+  // Complete all timers that are waiting to be completed.
+  virtual void complete_timers() = 0;
+
+  // Destroy all timers.
+  virtual void destroy_timers() = 0;
+};
+
+} // namespace detail
+} // namespace asio
+} // namespace boost
+
+#include <boost/asio/detail/pop_options.hpp>
+
+#endif // BOOST_ASIO_DETAIL_TIMER_QUEUE_BASE_HPP