1 // 2 // system_timer.hpp 3 // ~~~~~~~~~~~~~~~~ 4 // 5 // Copyright (c) 2003-2015 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_SYSTEM_TIMER_HPP 12 #define BOOST_ASIO_SYSTEM_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_STD_CHRONO) \ 21 || defined(BOOST_ASIO_HAS_BOOST_CHRONO) \ 22 || defined(GENERATING_DOCUMENTATION) 23 24 #if defined(BOOST_ASIO_HAS_STD_CHRONO) 25 # include <chrono> 26 #elif defined(BOOST_ASIO_HAS_BOOST_CHRONO) 27 # include <boost/chrono/system_clocks.hpp> 28 #endif 29 30 #include <boost/asio/basic_waitable_timer.hpp> 31 32 namespace boost { 33 namespace asio { 34 35 #if defined(GENERATING_DOCUMENTATION) 36 /// Typedef for a timer based on the system clock. 37 /** 38 * This typedef uses the C++11 @c <chrono> standard library facility, if 39 * available. Otherwise, it may use the Boost.Chrono library. To explicitly 40 * utilise Boost.Chrono, use the basic_waitable_timer template directly: 41 * @code 42 * typedef basic_waitable_timer<boost::chrono::system_clock> timer; 43 * @endcode 44 */ 45 typedef basic_waitable_timer<chrono::system_clock> system_timer; 46 #elif defined(BOOST_ASIO_HAS_STD_CHRONO) 47 typedef basic_waitable_timer<std::chrono::system_clock> system_timer; 48 #elif defined(BOOST_ASIO_HAS_BOOST_CHRONO) 49 typedef basic_waitable_timer<boost::chrono::system_clock> system_timer; 50 #endif 51 52 } // namespace asio 53 } // namespace boost 54 55 #endif // defined(BOOST_ASIO_HAS_STD_CHRONO) 56 // || defined(BOOST_ASIO_HAS_BOOST_CHRONO) 57 // || defined(GENERATING_DOCUMENTATION) 58 59 #endif // BOOST_ASIO_SYSTEM_TIMER_HPP 60