boost/asio/time_traits.hpp

   1 //
   2 // time_traits.hpp
   3 // ~~~~~~~~~~~~~~~
   4 //
   5 // Copyright (c) 2003-2008 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_TIME_TRAITS_HPP
  12 #define BOOST_ASIO_TIME_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 #include <boost/asio/detail/socket_types.hpp> // Must come before posix_time.
  21
  22 #include <boost/asio/detail/push_options.hpp>
  23 #include <boost/date_time/posix_time/posix_time_types.hpp>
  24 #include <boost/asio/detail/pop_options.hpp>
  25
  26 namespace boost {
  27 namespace asio {
  28
  29 /// Time traits suitable for use with the deadline timer.
  30 template <typename Time>
  31 struct time_traits;
  32
  33 /// Time traits specialised for posix_time.
  34 template <>
  35 struct time_traits<boost::posix_time::ptime>
  36 {
  37   /// The time type.
  38   typedef boost::posix_time::ptime time_type;
  39
  40   /// The duration type.
  41   typedef boost::posix_time::time_duration duration_type;
  42
  43   /// Get the current time.
  44   static time_type now()
  45   {
  46     return boost::posix_time::microsec_clock::universal_time();
  47   }
  48
  49   /// Add a duration to a time.
  50   static time_type add(const time_type& t, const duration_type& d)
  51   {
  52     return t + d;
  53   }
  54
  55   /// Subtract one time from another.
  56   static duration_type subtract(const time_type& t1, const time_type& t2)
  57   {
  58     return t1 - t2;
  59   }
  60
  61   /// Test whether one time is less than another.
  62   static bool less_than(const time_type& t1, const time_type& t2)
  63   {
  64     return t1 < t2;
  65   }
  66
  67   /// Convert to POSIX duration type.
  68   static boost::posix_time::time_duration to_posix_duration(
  69       const duration_type& d)
  70   {
  71     return d;
  72   }
  73 };
  74
  75 } // namespace asio
  76 } // namespace boost
  77
  78 #include <boost/asio/detail/pop_options.hpp>
  79
  80 #endif // BOOST_ASIO_TIME_TRAITS_HPP