1//
2// high_resolution_timer.hpp
3// ~~~~~~~~~~~~~~~~~~~~~~~~~
4//
5// Copyright (c) 2003-2024 Christopher M. Kohlhoff (chris at kohlhoff dot com)
6//
7// Distributed under the Boost Software License, Version 1.0. (See accompanying
8// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
9//
10
11#ifndef BOOST_ASIO_HIGH_RESOLUTION_TIMER_HPP
12#define BOOST_ASIO_HIGH_RESOLUTION_TIMER_HPP
13
14#if defined(_MSC_VER) && (_MSC_VER >= 1200)
15# pragma once
16#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
17
18#include <boost/asio/detail/config.hpp>
19#include <boost/asio/basic_waitable_timer.hpp>
20#include <boost/asio/detail/chrono.hpp>
21
22namespace boost {
23namespace asio {
24
25/// Typedef for a timer based on the high resolution clock.
26/**
27 * This typedef uses the C++11 @c &lt;chrono&gt; standard library facility, if
28 * available. Otherwise, it may use the Boost.Chrono library. To explicitly
29 * utilise Boost.Chrono, use the basic_waitable_timer template directly:
30 * @code
31 * typedef basic_waitable_timer<boost::chrono::high_resolution_clock> timer;
32 * @endcode
33 */
34typedef basic_waitable_timer<
35 chrono::high_resolution_clock>
36 high_resolution_timer;
37
38} // namespace asio
39} // namespace boost
40
41#endif // BOOST_ASIO_HIGH_RESOLUTION_TIMER_HPP
42

source code of boost/libs/asio/include/boost/asio/high_resolution_timer.hpp