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include/asio/system_timer.hpp

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+//
+// system_timer.hpp
+// ~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2025 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_SYSTEM_TIMER_HPP
+#define ASIO_SYSTEM_TIMER_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/config.hpp"
+#include "asio/basic_waitable_timer.hpp"
+#include "asio/detail/chrono.hpp"
+
+namespace asio {
+
+/// Typedef for a timer based on the system clock.
+/**
+ * This typedef uses the C++11 @c <chrono> standard library facility, if
+ * available. Otherwise, it may use the Boost.Chrono library. To explicitly
+ * utilise Boost.Chrono, use the basic_waitable_timer template directly:
+ * @code
+ * typedef basic_waitable_timer<boost::chrono::system_clock> timer;
+ * @endcode
+ */
+typedef basic_waitable_timer<chrono::system_clock> system_timer;
+
+} // namespace asio
+
+#endif // ASIO_SYSTEM_TIMER_HPP