ceph/src/boost/boost/asio/wait_traits.hpp

   1 //
   2 // wait_traits.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_WAIT_TRAITS_HPP
  12 #define BOOST_ASIO_WAIT_TRAITS_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/push_options.hpp>
  19
  20 namespace boost {
  21 namespace asio {
  22
  23 /// Wait traits suitable for use with the basic_waitable_timer class template.
  24 template <typename Clock>
  25 struct wait_traits
  26 {
  27   /// Convert a clock duration into a duration used for waiting.
  28   /**
  29    * @returns @c d.
  30    */
  31   static typename Clock::duration to_wait_duration(
  32       const typename Clock::duration& d)
  33   {
  34     return d;
  35   }
  36
  37   /// Convert a clock duration into a duration used for waiting.
  38   /**
  39    * @returns @c d.
  40    */
  41   static typename Clock::duration to_wait_duration(
  42       const typename Clock::time_point& t)
  43   {
  44     typename Clock::time_point now = Clock::now();
  45     if (now + (Clock::duration::max)() < t)
  46       return (Clock::duration::max)();
  47     if (now + (Clock::duration::min)() > t)
  48       return (Clock::duration::min)();
  49     return t - now;
  50   }
  51 };
  52
  53 } // namespace asio
  54 } // namespace boost
  55
  56 #include <boost/asio/detail/pop_options.hpp>
  57
  58 #endif // BOOST_ASIO_WAIT_TRAITS_HPP