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diff --git a/lib/asio/detail/timer_queue_base.hpp b/lib/asio/detail/timer_queue_base.hpp
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+++ b/lib/asio/detail/timer_queue_base.hpp
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+//
+// detail/timer_queue_base.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_TIMER_QUEUE_BASE_HPP
+#define ASIO_DETAIL_TIMER_QUEUE_BASE_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/noncopyable.hpp"
+#include "asio/detail/op_queue.hpp"
+#include "asio/detail/operation.hpp"
+
+#include "asio/detail/push_options.hpp"
+
+namespace asio {
+namespace detail {
+
+class timer_queue_base
+  : private noncopyable
+{
+public:
+  // Constructor.
+  timer_queue_base() : next_(0) {}
+
+  // 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 long wait_duration_msec(long max_duration) const = 0;
+
+  // Get the time to wait until the next timer.
+  virtual long wait_duration_usec(long max_duration) const = 0;
+
+  // Dequeue all ready timers.
+  virtual void get_ready_timers(op_queue<operation>& ops) = 0;
+
+  // Dequeue all timers.
+  virtual void get_all_timers(op_queue<operation>& ops) = 0;
+
+private:
+  friend class timer_queue_set;
+
+  // Next timer queue in the set.
+  timer_queue_base* next_;
+};
+
+template <typename Time_Traits>
+class timer_queue;
+
+} // namespace detail
+} // namespace asio
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_DETAIL_TIMER_QUEUE_BASE_HPP