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diff --git a/lib/asio/waitable_timer_service.hpp b/lib/asio/waitable_timer_service.hpp
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+//
+// waitable_timer_service.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_WAITABLE_TIMER_SERVICE_HPP
+#define ASIO_WAITABLE_TIMER_SERVICE_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/config.hpp"
+
+#if defined(ASIO_ENABLE_OLD_SERVICES)
+
+#include <cstddef>
+#include "asio/async_result.hpp"
+#include "asio/detail/chrono_time_traits.hpp"
+#include "asio/detail/deadline_timer_service.hpp"
+#include "asio/io_context.hpp"
+#include "asio/wait_traits.hpp"
+
+#include "asio/detail/push_options.hpp"
+
+namespace asio {
+
+/// Default service implementation for a timer.
+template <typename Clock,
+    typename WaitTraits = asio::wait_traits<Clock> >
+class waitable_timer_service
+#if defined(GENERATING_DOCUMENTATION)
+  : public asio::io_context::service
+#else
+  : public asio::detail::service_base<
+      waitable_timer_service<Clock, WaitTraits> >
+#endif
+{
+public:
+#if defined(GENERATING_DOCUMENTATION)
+  /// The unique service identifier.
+  static asio::io_context::id id;
+#endif
+
+  /// The clock type.
+  typedef Clock clock_type;
+
+  /// The duration type of the clock.
+  typedef typename clock_type::duration duration;
+
+  /// The time point type of the clock.
+  typedef typename clock_type::time_point time_point;
+
+  /// The wait traits type.
+  typedef WaitTraits traits_type;
+
+private:
+  // The type of the platform-specific implementation.
+  typedef detail::deadline_timer_service<
+    detail::chrono_time_traits<Clock, WaitTraits> > service_impl_type;
+
+public:
+  /// The implementation type of the waitable timer.
+#if defined(GENERATING_DOCUMENTATION)
+  typedef implementation_defined implementation_type;
+#else
+  typedef typename service_impl_type::implementation_type implementation_type;
+#endif
+
+  /// Construct a new timer service for the specified io_context.
+  explicit waitable_timer_service(asio::io_context& io_context)
+    : asio::detail::service_base<
+        waitable_timer_service<Clock, WaitTraits> >(io_context),
+      service_impl_(io_context)
+  {
+  }
+
+  /// Construct a new timer implementation.
+  void construct(implementation_type& impl)
+  {
+    service_impl_.construct(impl);
+  }
+
+  /// Destroy a timer implementation.
+  void destroy(implementation_type& impl)
+  {
+    service_impl_.destroy(impl);
+  }
+
+#if defined(ASIO_HAS_MOVE) || defined(GENERATING_DOCUMENTATION)
+  /// Move-construct a new timer implementation.
+  void move_construct(implementation_type& impl,
+      implementation_type& other_impl)
+  {
+    service_impl_.move_construct(impl, other_impl);
+  }
+
+  /// Move-assign from another timer implementation.
+  void move_assign(implementation_type& impl,
+      waitable_timer_service& other_service,
+      implementation_type& other_impl)
+  {
+    service_impl_.move_assign(impl, other_service.service_impl_, other_impl);
+  }
+#endif // defined(ASIO_HAS_MOVE) || defined(GENERATING_DOCUMENTATION)
+
+  /// Cancel any asynchronous wait operations associated with the timer.
+  std::size_t cancel(implementation_type& impl, asio::error_code& ec)
+  {
+    return service_impl_.cancel(impl, ec);
+  }
+
+  /// Cancels one asynchronous wait operation associated with the timer.
+  std::size_t cancel_one(implementation_type& impl,
+      asio::error_code& ec)
+  {
+    return service_impl_.cancel_one(impl, ec);
+  }
+
+#if !defined(ASIO_NO_DEPRECATED)
+  /// (Deprecated: Use expiry().) Get the expiry time for the timer as an
+  /// absolute time.
+  time_point expires_at(const implementation_type& impl) const
+  {
+    return service_impl_.expiry(impl);
+  }
+#endif // !defined(ASIO_NO_DEPRECATED)
+
+  /// Get the expiry time for the timer as an absolute time.
+  time_point expiry(const implementation_type& impl) const
+  {
+    return service_impl_.expiry(impl);
+  }
+
+  /// Set the expiry time for the timer as an absolute time.
+  std::size_t expires_at(implementation_type& impl,
+      const time_point& expiry_time, asio::error_code& ec)
+  {
+    return service_impl_.expires_at(impl, expiry_time, ec);
+  }
+
+  /// Set the expiry time for the timer relative to now.
+  std::size_t expires_after(implementation_type& impl,
+      const duration& expiry_time, asio::error_code& ec)
+  {
+    return service_impl_.expires_after(impl, expiry_time, ec);
+  }
+
+#if !defined(ASIO_NO_DEPRECATED)
+  /// (Deprecated: Use expiry().) Get the expiry time for the timer relative to
+  /// now.
+  duration expires_from_now(const implementation_type& impl) const
+  {
+    typedef detail::chrono_time_traits<Clock, WaitTraits> traits;
+    return traits::subtract(service_impl_.expiry(impl), traits::now());
+  }
+
+  /// (Deprecated: Use expires_after().) Set the expiry time for the timer
+  /// relative to now.
+  std::size_t expires_from_now(implementation_type& impl,
+      const duration& expiry_time, asio::error_code& ec)
+  {
+    return service_impl_.expires_after(impl, expiry_time, ec);
+  }
+#endif // !defined(ASIO_NO_DEPRECATED)
+
+  // Perform a blocking wait on the timer.
+  void wait(implementation_type& impl, asio::error_code& ec)
+  {
+    service_impl_.wait(impl, ec);
+  }
+
+  // Start an asynchronous wait on the timer.
+  template <typename WaitHandler>
+  ASIO_INITFN_RESULT_TYPE(WaitHandler,
+      void (asio::error_code))
+  async_wait(implementation_type& impl,
+      ASIO_MOVE_ARG(WaitHandler) handler)
+  {
+    async_completion<WaitHandler,
+      void (asio::error_code)> init(handler);
+
+    service_impl_.async_wait(impl, init.completion_handler);
+
+    return init.result.get();
+  }
+
+private:
+  // Destroy all user-defined handler objects owned by the service.
+  void shutdown()
+  {
+    service_impl_.shutdown();
+  }
+
+  // The platform-specific implementation.
+  service_impl_type service_impl_;
+};
+
+} // namespace asio
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // defined(ASIO_ENABLE_OLD_SERVICES)
+
+#endif // ASIO_WAITABLE_TIMER_SERVICE_HPP