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+//
+// time_traits.hpp
+// ~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2012 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef BOOST_ASIO_TIME_TRAITS_HPP
+#define BOOST_ASIO_TIME_TRAITS_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include <boost/asio/detail/socket_types.hpp> // Must come before posix_time.
+
+#include <boost/asio/detail/push_options.hpp>
+#include <boost/date_time/posix_time/posix_time_types.hpp>
+#include <boost/asio/detail/pop_options.hpp>
+
+#include <boost/asio/detail/push_options.hpp>
+
+namespace boost {
+namespace asio {
+
+/// Time traits suitable for use with the deadline timer.
+template <typename Time>
+struct time_traits;
+
+/// Time traits specialised for posix_time.
+template <>
+struct time_traits<boost::posix_time::ptime>
+{
+ /// The time type.
+ typedef boost::posix_time::ptime time_type;
+
+ /// The duration type.
+ typedef boost::posix_time::time_duration duration_type;
+
+ /// Get the current time.
+ static time_type now()
+ {
+#if defined(BOOST_DATE_TIME_HAS_HIGH_PRECISION_CLOCK)
+ return boost::posix_time::microsec_clock::universal_time();
+#else // defined(BOOST_DATE_TIME_HAS_HIGH_PRECISION_CLOCK)
+ return boost::posix_time::second_clock::universal_time();
+#endif // defined(BOOST_DATE_TIME_HAS_HIGH_PRECISION_CLOCK)
+ }
+
+ /// Add a duration to a time.
+ static time_type add(const time_type& t, const duration_type& d)
+ {
+ return t + d;
+ }
+
+ /// Subtract one time from another.
+ static duration_type subtract(const time_type& t1, const time_type& t2)
+ {
+ return t1 - t2;
+ }
+
+ /// Test whether one time is less than another.
+ static bool less_than(const time_type& t1, const time_type& t2)
+ {
+ return t1 < t2;
+ }
+
+ /// Convert to POSIX duration type.
+ static boost::posix_time::time_duration to_posix_duration(
+ const duration_type& d)
+ {
+ return d;
+ }
+};
+
+} // namespace asio
+} // namespace boost
+
+#include <boost/asio/detail/pop_options.hpp>
+
+#endif // BOOST_ASIO_TIME_TRAITS_HPP