util: switch to boost::asio::basic_waitable_timer

Change-Id: I2724befc86482adf84f59063e65509a116bb1b46
Refs: #4431
diff --git a/src/util/detail/steady-timer.hpp b/src/util/detail/steady-timer.hpp
new file mode 100644
index 0000000..4fb4e27
--- /dev/null
+++ b/src/util/detail/steady-timer.hpp
@@ -0,0 +1,60 @@
+/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
+/*
+ * Copyright (c) 2013-2018 Regents of the University of California.
+ *
+ * This file is part of ndn-cxx library (NDN C++ library with eXperimental eXtensions).
+ *
+ * ndn-cxx library is free software: you can redistribute it and/or modify it under the
+ * terms of the GNU Lesser General Public License as published by the Free Software
+ * Foundation, either version 3 of the License, or (at your option) any later version.
+ *
+ * ndn-cxx library is distributed in the hope that it will be useful, but WITHOUT ANY
+ * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
+ * PARTICULAR PURPOSE.  See the GNU Lesser General Public License for more details.
+ *
+ * You should have received copies of the GNU General Public License and GNU Lesser
+ * General Public License along with ndn-cxx, e.g., in COPYING.md file.  If not, see
+ * <http://www.gnu.org/licenses/>.
+ *
+ * See AUTHORS.md for complete list of ndn-cxx authors and contributors.
+ */
+
+#ifndef NDN_UTIL_DETAIL_STEADY_TIMER_HPP
+#define NDN_UTIL_DETAIL_STEADY_TIMER_HPP
+
+#include "../time.hpp"
+
+#include <boost/asio/basic_waitable_timer.hpp>
+#include <boost/asio/wait_traits.hpp>
+
+namespace boost {
+namespace asio {
+
+template<>
+struct wait_traits<ndn::time::steady_clock>
+{
+  static ndn::time::steady_clock::duration
+  to_wait_duration(const ndn::time::steady_clock::duration& d)
+  {
+    return ndn::time::steady_clock::to_wait_duration(d);
+  }
+};
+
+} // namespace asio
+} // namespace boost
+
+namespace ndn {
+namespace util {
+namespace detail {
+
+class SteadyTimer : public boost::asio::basic_waitable_timer<time::steady_clock>
+{
+public:
+  using boost::asio::basic_waitable_timer<time::steady_clock>::basic_waitable_timer;
+};
+
+} // namespace detail
+} // namespace util
+} // namespace ndn
+
+#endif // NDN_UTIL_DETAIL_STEADY_TIMER_HPP