1 // 2 // time_traits.hpp 3 // ~~~~~~~~~~~~~~~ 4 // 5 // Copyright (c) 2003-2021 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/socket_types.hpp> // Must come before posix_time. 19 20 #if defined(BOOST_ASIO_HAS_BOOST_DATE_TIME) \ 21 || defined(GENERATING_DOCUMENTATION) 22 23 #include <boost/date_time/posix_time/posix_time_types.hpp> 24 25 #include <boost/asio/detail/push_options.hpp> 26 27 namespace boost { 28 namespace asio { 29 30 /// Time traits suitable for use with the deadline timer. 31 template <typename Time> 32 struct time_traits; 33 34 /// Time traits specialised for posix_time. 35 template <> 36 struct time_traits<boost::posix_time::ptime> 37 { 38 /// The time type. 39 typedef boost::posix_time::ptime time_type; 40 41 /// The duration type. 42 typedef boost::posix_time::time_duration duration_type; 43 44 /// Get the current time. nowboost::asio::time_traits45 static time_type now() 46 { 47 #if defined(BOOST_DATE_TIME_HAS_HIGH_PRECISION_CLOCK) 48 return boost::posix_time::microsec_clock::universal_time(); 49 #else // defined(BOOST_DATE_TIME_HAS_HIGH_PRECISION_CLOCK) 50 return boost::posix_time::second_clock::universal_time(); 51 #endif // defined(BOOST_DATE_TIME_HAS_HIGH_PRECISION_CLOCK) 52 } 53 54 /// Add a duration to a time. addboost::asio::time_traits55 static time_type add(const time_type& t, const duration_type& d) 56 { 57 return t + d; 58 } 59 60 /// Subtract one time from another. subtractboost::asio::time_traits61 static duration_type subtract(const time_type& t1, const time_type& t2) 62 { 63 return t1 - t2; 64 } 65 66 /// Test whether one time is less than another. less_thanboost::asio::time_traits67 static bool less_than(const time_type& t1, const time_type& t2) 68 { 69 return t1 < t2; 70 } 71 72 /// Convert to POSIX duration type. to_posix_durationboost::asio::time_traits73 static boost::posix_time::time_duration to_posix_duration( 74 const duration_type& d) 75 { 76 return d; 77 } 78 }; 79 80 } // namespace asio 81 } // namespace boost 82 83 #include <boost/asio/detail/pop_options.hpp> 84 85 #endif // defined(BOOST_ASIO_HAS_BOOST_DATE_TIME) 86 // || defined(GENERATING_DOCUMENTATION) 87 88 #endif // BOOST_ASIO_TIME_TRAITS_HPP 89