1 // 2 // high_resolution_timer.hpp 3 // ~~~~~~~~~~~~~~~~~~~~~~~~~ 4 // 5 // Copyright (c) 2003-2021 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 20 #if defined(BOOST_ASIO_HAS_CHRONO) || defined(GENERATING_DOCUMENTATION) 21 22 #include <boost/asio/basic_waitable_timer.hpp> 23 #include <boost/asio/detail/chrono.hpp> 24 25 namespace boost { 26 namespace asio { 27 28 /// Typedef for a timer based on the high resolution clock. 29 /** 30 * This typedef uses the C++11 @c <chrono> standard library facility, if 31 * available. Otherwise, it may use the Boost.Chrono library. To explicitly 32 * utilise Boost.Chrono, use the basic_waitable_timer template directly: 33 * @code 34 * typedef basic_waitable_timer<boost::chrono::high_resolution_clock> timer; 35 * @endcode 36 */ 37 typedef basic_waitable_timer< 38 chrono::high_resolution_clock> 39 high_resolution_timer; 40 41 } // namespace asio 42 } // namespace boost 43 44 #endif // defined(BOOST_ASIO_HAS_CHRONO) || defined(GENERATING_DOCUMENTATION) 45 46 #endif // BOOST_ASIO_HIGH_RESOLUTION_TIMER_HPP 47