system_timer.hpp 1.7 KB

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  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. #ifndef ASIO_SYSTEM_TIMER_HPP
  11. #define ASIO_SYSTEM_TIMER_HPP
  12. #if defined(_MSC_VER) && (_MSC_VER >= 1200)
  13. # pragma once
  14. #endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
  15. #include "asio/detail/config.hpp"
  16. #if defined(ASIO_HAS_STD_CHRONO) \
  17. || defined(ASIO_HAS_BOOST_CHRONO) \
  18. || defined(GENERATING_DOCUMENTATION)
  19. #if defined(ASIO_HAS_STD_CHRONO)
  20. # include <chrono>
  21. #elif defined(ASIO_HAS_BOOST_CHRONO)
  22. # include <boost/chrono/system_clocks.hpp>
  23. #endif
  24. #include "asio/basic_waitable_timer.hpp"
  25. namespace asio {
  26. #if defined(GENERATING_DOCUMENTATION)
  27. /// Typedef for a timer based on the system clock.
  28. /**
  29. * This typedef uses the C++11 @c &lt;chrono&gt; standard library facility, if
  30. * available. Otherwise, it may use the Boost.Chrono library. To explicitly
  31. * utilise Boost.Chrono, use the basic_waitable_timer template directly:
  32. * @code
  33. * typedef basic_waitable_timer<boost::chrono::system_clock> timer;
  34. * @endcode
  35. */
  36. typedef basic_waitable_timer<chrono::system_clock> system_timer;
  37. #elif defined(ASIO_HAS_STD_CHRONO)
  38. typedef basic_waitable_timer<std::chrono::system_clock> system_timer;
  39. #elif defined(ASIO_HAS_BOOST_CHRONO)
  40. typedef basic_waitable_timer<boost::chrono::system_clock> system_timer;
  41. #endif
  42. } // namespace asio
  43. #endif // defined(ASIO_HAS_STD_CHRONO)
  44. // || defined(ASIO_HAS_BOOST_CHRONO)
  45. // || defined(GENERATING_DOCUMENTATION)
  46. #endif // ASIO_SYSTEM_TIMER_HPP