[857] | 1 | #ifndef DATE_TIME_HIGHRES_TIME_CLOCK_HPP___
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| 2 | #define DATE_TIME_HIGHRES_TIME_CLOCK_HPP___
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| 3 |
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| 4 | /* Copyright (c) 2002,2003,2005 CrystalClear Software, Inc.
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| 5 | * Use, modification and distribution is subject to the
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| 6 | * Boost Software License, Version 1.0. (See accompanying
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| 7 | * file LICENSE-1.0 or http://www.boost.org/LICENSE-1.0)
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| 8 | * Author: Jeff Garland, Bart Garst
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| 9 | * $Date: 2005/10/28 13:32:38 $
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| 10 | */
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| 11 |
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| 12 |
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| 13 | /*! @file microsec_time_clock.hpp
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| 14 | This file contains a high resolution time clock implementation.
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| 15 | */
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| 16 |
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| 17 | #include <boost/detail/workaround.hpp>
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| 18 | #include "boost/date_time/c_time.hpp"
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| 19 | #include "boost/cstdint.hpp"
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| 20 | #include "boost/shared_ptr.hpp"
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| 21 |
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| 22 | #ifdef BOOST_HAS_FTIME
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| 23 | #include <windows.h>
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| 24 | #endif
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| 25 |
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| 26 | #ifdef BOOST_DATE_TIME_HAS_HIGH_PRECISION_CLOCK
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| 27 |
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| 28 | namespace boost {
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| 29 | namespace date_time {
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| 30 |
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| 31 |
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| 32 | //! A clock providing microsecond level resolution
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| 33 | /*! A high precision clock that measures the local time
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| 34 | * at a resolution up to microseconds and adjusts to the
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| 35 | * resolution of the time system. For example, for the
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| 36 | * a library configuration with nano second resolution,
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| 37 | * the last 3 places of the fractional seconds will always
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| 38 | * be 000 since there are 1000 nano-seconds in a micro second.
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| 39 | */
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| 40 | template<class time_type>
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| 41 | class microsec_clock
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| 42 | {
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| 43 | public:
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| 44 | typedef typename time_type::date_type date_type;
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| 45 | typedef typename time_type::time_duration_type time_duration_type;
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| 46 | typedef typename time_duration_type::rep_type resolution_traits_type;
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| 47 |
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| 48 | //! return a local time object for the given zone, based on computer clock
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| 49 | //JKG -- looks like we could rewrite this against universal_time
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| 50 | template<class time_zone_type>
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| 51 | static time_type local_time(shared_ptr<time_zone_type> tz_ptr) {
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| 52 | typedef typename time_type::utc_time_type utc_time_type;
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| 53 | typedef second_clock<utc_time_type> second_clock;
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| 54 | // we'll need to know the utc_offset this machine has
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| 55 | // in order to get a utc_time_type set to utc
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| 56 | utc_time_type utc_time = second_clock::universal_time();
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| 57 | time_duration_type utc_offset = second_clock::local_time() - utc_time;
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| 58 | // use micro clock to get a local time with sub seconds
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| 59 | // and adjust it to get a true utc time reading with sub seconds
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| 60 | utc_time = microsec_clock<utc_time_type>::local_time() - utc_offset;
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| 61 | return time_type(utc_time, tz_ptr);
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| 62 | }
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| 63 |
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| 64 |
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| 65 | private:
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| 66 | // we want this enum available for both platforms yet still private
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| 67 | enum TZ_FOR_CREATE { LOCAL, GMT };
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| 68 |
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| 69 | public:
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| 70 |
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| 71 | #ifdef BOOST_HAS_GETTIMEOFDAY
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| 72 | //! Return the local time based on computer clock settings
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| 73 | static time_type local_time() {
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| 74 | return create_time(LOCAL);
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| 75 | }
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| 76 |
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| 77 | //! Get the current day in universal date as a ymd_type
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| 78 | static time_type universal_time()
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| 79 | {
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| 80 | return create_time(GMT);
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| 81 | }
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| 82 |
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| 83 | private:
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| 84 | static time_type create_time(TZ_FOR_CREATE tz) {
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| 85 | timeval tv;
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| 86 | gettimeofday(&tv, 0); //gettimeofday does not support TZ adjust on Linux.
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| 87 | std::time_t t = tv.tv_sec;
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| 88 | boost::uint32_t fs = tv.tv_usec;
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| 89 | std::tm curr, *curr_ptr = 0;
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| 90 | if (tz == LOCAL) {
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| 91 | curr_ptr = c_time::localtime(&t, &curr);
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| 92 | } else {
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| 93 | curr_ptr = c_time::gmtime(&t, &curr);
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| 94 | }
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| 95 | date_type d(curr_ptr->tm_year + 1900,
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| 96 | curr_ptr->tm_mon + 1,
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| 97 | curr_ptr->tm_mday);
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| 98 | //The following line will adjusts the fractional second tick in terms
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| 99 | //of the current time system. For example, if the time system
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| 100 | //doesn't support fractional seconds then res_adjust returns 0
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| 101 | //and all the fractional seconds return 0.
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| 102 | int adjust = resolution_traits_type::res_adjust()/1000000;
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| 103 |
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| 104 | time_duration_type td(curr_ptr->tm_hour,
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| 105 | curr_ptr->tm_min,
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| 106 | curr_ptr->tm_sec,
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| 107 | fs*adjust);
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| 108 | return time_type(d,td);
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| 109 |
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| 110 | }
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| 111 | #endif // BOOST_HAS_GETTIMEOFDAY
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| 112 |
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| 113 | #ifdef BOOST_HAS_FTIME
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| 114 | //! Return the local time based on computer clock settings
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| 115 | static time_type local_time() {
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| 116 | FILETIME ft;
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| 117 | #if BOOST_WORKAROUND(__MWERKS__, BOOST_TESTED_AT(0x3205))
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| 118 | // Some runtime library implementations expect local times as the norm for ctime.
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| 119 | FILETIME ft_utc;
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| 120 | GetSystemTimeAsFileTime(&ft_utc);
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| 121 | FileTimeToLocalFileTime(&ft_utc,&ft);
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| 122 | #else
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| 123 | GetSystemTimeAsFileTime(&ft);
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| 124 | #endif
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| 125 | return create_time(ft, LOCAL);
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| 126 | }
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| 127 |
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| 128 | //! Return the UTC time based on computer settings
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| 129 | static time_type universal_time() {
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| 130 | FILETIME ft;
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| 131 | #if BOOST_WORKAROUND(__MWERKS__, BOOST_TESTED_AT(0x3205))
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| 132 | // Some runtime library implementations expect local times as the norm for ctime.
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| 133 | FILETIME ft_utc;
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| 134 | GetSystemTimeAsFileTime(&ft_utc);
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| 135 | FileTimeToLocalFileTime(&ft_utc,&ft);
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| 136 | #else
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| 137 | GetSystemTimeAsFileTime(&ft);
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| 138 | #endif
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| 139 | return create_time(ft, GMT);
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| 140 | }
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| 141 |
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| 142 | private:
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| 143 | static time_type create_time(FILETIME& ft, TZ_FOR_CREATE tz) {
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| 144 | // offset is difference (in 100-nanoseconds) from
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| 145 | // 1970-Jan-01 to 1601-Jan-01
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| 146 | boost::uint64_t c1 = 27111902;
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| 147 | boost::uint64_t c2 = 3577643008UL; // 'UL' removes compiler warnings
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| 148 | const boost::uint64_t OFFSET = (c1 << 32) + c2;
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| 149 |
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| 150 | boost::uint64_t filetime = ft.dwHighDateTime;
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| 151 | filetime = filetime << 32;
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| 152 | filetime += ft.dwLowDateTime;
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| 153 | filetime -= OFFSET;
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| 154 | // filetime now holds 100-nanoseconds since 1970-Jan-01
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| 155 |
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| 156 | boost::uint32_t sub_sec = (filetime % 10000000) / 10; // microseconds
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| 157 |
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| 158 | std::time_t t = static_cast<time_t>(filetime / 10000000); // seconds since epoch
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| 159 |
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| 160 | std::tm curr, *curr_ptr = 0;
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| 161 | if (tz == LOCAL) {
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| 162 | curr_ptr = c_time::localtime(&t, &curr);
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| 163 | }
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| 164 | else {
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| 165 | curr_ptr = c_time::gmtime(&t, &curr);
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| 166 | }
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| 167 | date_type d(curr_ptr->tm_year + 1900,
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| 168 | curr_ptr->tm_mon + 1,
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| 169 | curr_ptr->tm_mday);
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| 170 |
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| 171 | //The following line will adjusts the fractional second tick in terms
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| 172 | //of the current time system. For example, if the time system
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| 173 | //doesn't support fractional seconds then res_adjust returns 0
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| 174 | //and all the fractional seconds return 0.
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| 175 | int adjust = resolution_traits_type::res_adjust()/1000000;
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| 176 |
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| 177 | time_duration_type td(curr_ptr->tm_hour,
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| 178 | curr_ptr->tm_min,
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| 179 | curr_ptr->tm_sec,
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| 180 | sub_sec * adjust);
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| 181 | //st.wMilliseconds * adjust);
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| 182 | return time_type(d,td);
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| 183 |
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| 184 | }
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| 185 | #endif // BOOST_HAS_FTIME
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| 186 | };
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| 187 |
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| 188 |
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| 189 | } } //namespace date_time
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| 190 |
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| 191 | #endif //BOOST_DATE_TIME_HAS_HIGH_PRECISION_CLOCK
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| 192 |
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| 193 |
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| 194 | #endif
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| 195 |
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