boost/asio/high_resolution_timer.hpp

   1 //
   2 // high_resolution_timer.hpp
   3 // ~~~~~~~~~~~~~~~~~~~~~~~~~
   4 //
   5 // Copyright (c) 2003-2017 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_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 high resolution clock.
  37 /**
  38  * This typedef uses the C++11 @c &lt;chrono&gt; 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::high_resolution_clock> timer;
  43  * @endcode
  44  */
  45 typedef basic_waitable_timer<
  46     chrono::high_resolution_clock>
  47   high_resolution_timer;
  48 #elif defined(BOOST_ASIO_HAS_STD_CHRONO)
  49 typedef basic_waitable_timer<
  50     std::chrono::high_resolution_clock>
  51   high_resolution_timer;
  52 #elif defined(BOOST_ASIO_HAS_BOOST_CHRONO)
  53 typedef basic_waitable_timer<
  54     boost::chrono::high_resolution_clock>
  55   high_resolution_timer;
  56 #endif
  57
  58 } // namespace asio
  59 } // namespace boost
  60
  61 #endif // defined(BOOST_ASIO_HAS_STD_CHRONO)
  62        //   || defined(BOOST_ASIO_HAS_BOOST_CHRONO)
  63        //   || defined(GENERATING_DOCUMENTATION)
  64
  65 #endif // BOOST_ASIO_HIGH_RESOLUTION_TIMER_HPP