[857] | 1 | #ifndef DATE_TIME_TIME_SYSTEM_COUNTED_HPP
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| 2 | #define DATE_TIME_TIME_SYSTEM_COUNTED_HPP
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| 3 |
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| 4 | /* Copyright (c) 2002,2003 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: 2004/12/07 11:00:12 $
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| 10 | */
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| 11 |
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| 12 |
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| 13 |
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| 14 | #include "boost/date_time/time_defs.hpp"
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| 15 | #include <string>
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| 16 |
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| 17 |
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| 18 | namespace boost {
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| 19 | namespace date_time {
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| 20 |
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| 21 | //! Time representation that uses a single integer count
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| 22 | template<class config>
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| 23 | struct counted_time_rep
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| 24 | {
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| 25 | typedef typename config::int_type int_type;
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| 26 | typedef typename config::date_type date_type;
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| 27 | typedef typename config::impl_type impl_type;
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| 28 | typedef typename date_type::duration_type date_duration_type;
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| 29 | typedef typename date_type::calendar_type calendar_type;
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| 30 | typedef typename date_type::ymd_type ymd_type;
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| 31 | typedef typename config::time_duration_type time_duration_type;
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| 32 | typedef typename config::resolution_traits resolution_traits;
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| 33 |
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| 34 | counted_time_rep(const date_type& d, const time_duration_type& tod)
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| 35 | : time_count_(1)
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| 36 | {
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| 37 | if(d.is_infinity() || d.is_not_a_date() || tod.is_special()) {
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| 38 | time_count_ = tod.get_rep() + d.day_count();
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| 39 | //std::cout << time_count_ << std::endl;
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| 40 | }
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| 41 | else {
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| 42 | time_count_ = (d.day_number() * frac_sec_per_day()) + tod.ticks();
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| 43 | }
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| 44 | }
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| 45 | explicit counted_time_rep(int_type count) :
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| 46 | time_count_(count)
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| 47 | {}
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| 48 | explicit counted_time_rep(impl_type count) :
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| 49 | time_count_(count)
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| 50 | {}
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| 51 | date_type date() const
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| 52 | {
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| 53 | if(time_count_.is_special()) {
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| 54 | return date_type(time_count_.as_special());
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| 55 | }
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| 56 | else {
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| 57 | typename calendar_type::date_int_type dc = day_count();
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| 58 | //std::cout << "time_rep here:" << dc << std::endl;
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| 59 | ymd_type ymd = calendar_type::from_day_number(dc);
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| 60 | return date_type(ymd);
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| 61 | }
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| 62 | }
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| 63 | //int_type day_count() const
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| 64 | unsigned long day_count() const
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| 65 | {
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| 66 | /* resolution_traits::as_number returns a boost::int64_t &
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| 67 | * frac_sec_per_day is also a boost::int64_t so, naturally,
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| 68 | * the division operation returns a boost::int64_t.
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| 69 | * The static_cast to an unsigned long is ok (results in no data loss)
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| 70 | * because frac_sec_per_day is either the number of
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| 71 | * microseconds per day, or the number of nanoseconds per day.
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| 72 | * Worst case scenario: resolution_traits::as_number returns the
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| 73 | * maximum value an int64_t can hold and frac_sec_per_day
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| 74 | * is microseconds per day (lowest possible value).
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| 75 | * The division operation will then return a value of 106751991 -
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| 76 | * easily fitting in an unsigned long.
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| 77 | */
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| 78 | return static_cast<unsigned long>(resolution_traits::as_number(time_count_) / frac_sec_per_day());
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| 79 | }
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| 80 | int_type time_count() const
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| 81 | {
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| 82 | return resolution_traits::as_number(time_count_);
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| 83 | }
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| 84 | int_type tod() const
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| 85 | {
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| 86 | return resolution_traits::as_number(time_count_) % frac_sec_per_day();
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| 87 | }
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| 88 | static int_type frac_sec_per_day()
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| 89 | {
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| 90 | int_type seconds_per_day = 60*60*24;
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| 91 | int_type fractional_sec_per_sec(resolution_traits::res_adjust());
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| 92 | return seconds_per_day*fractional_sec_per_sec;
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| 93 | }
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| 94 | bool is_pos_infinity()const
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| 95 | {
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| 96 | return impl_type::is_pos_inf(time_count_.as_number());
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| 97 | }
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| 98 | bool is_neg_infinity()const
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| 99 | {
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| 100 | return impl_type::is_neg_inf(time_count_.as_number());
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| 101 | }
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| 102 | bool is_not_a_date_time()const
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| 103 | {
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| 104 | return impl_type::is_not_a_number(time_count_.as_number());
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| 105 | }
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| 106 | bool is_special()const
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| 107 | {
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| 108 | return time_count_.is_special();
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| 109 | }
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| 110 | impl_type get_rep()const
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| 111 | {
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| 112 | return time_count_;
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| 113 | }
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| 114 | private:
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| 115 | impl_type time_count_;
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| 116 | };
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| 117 |
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| 118 | //! An unadjusted time system implementation.
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| 119 | template<class time_rep>
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| 120 | class counted_time_system
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| 121 | {
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| 122 | public:
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| 123 | typedef time_rep time_rep_type;
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| 124 | typedef typename time_rep_type::impl_type impl_type;
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| 125 | typedef typename time_rep_type::time_duration_type time_duration_type;
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| 126 | typedef typename time_duration_type::fractional_seconds_type fractional_seconds_type;
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| 127 | typedef typename time_rep_type::date_type date_type;
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| 128 | typedef typename time_rep_type::date_duration_type date_duration_type;
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| 129 |
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| 130 |
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| 131 | template<class T> static void unused_var(const T&) {}
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| 132 |
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| 133 | static time_rep_type get_time_rep(const date_type& day,
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| 134 | const time_duration_type& tod,
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| 135 | date_time::dst_flags dst=not_dst)
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| 136 | {
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| 137 | unused_var(dst);
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| 138 | return time_rep_type(day, tod);
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| 139 | }
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| 140 |
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| 141 | static time_rep_type get_time_rep(special_values sv)
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| 142 | {
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| 143 | switch (sv) {
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| 144 | case not_a_date_time:
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| 145 | return time_rep_type(date_type(not_a_date_time),
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| 146 | time_duration_type(not_a_date_time));
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| 147 | case pos_infin:
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| 148 | return time_rep_type(date_type(pos_infin),
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| 149 | time_duration_type(pos_infin));
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| 150 | case neg_infin:
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| 151 | return time_rep_type(date_type(neg_infin),
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| 152 | time_duration_type(neg_infin));
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| 153 | case max_date_time: {
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| 154 | time_duration_type td = time_duration_type(24,0,0,0) - time_duration_type(0,0,0,1);
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| 155 | return time_rep_type(date_type(max_date_time), td);
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| 156 | }
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| 157 | case min_date_time:
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| 158 | return time_rep_type(date_type(min_date_time), time_duration_type(0,0,0,0));
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| 159 |
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| 160 | default:
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| 161 | return time_rep_type(date_type(not_a_date_time),
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| 162 | time_duration_type(not_a_date_time));
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| 163 |
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| 164 | }
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| 165 |
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| 166 | }
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| 167 |
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| 168 | static date_type get_date(const time_rep_type& val)
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| 169 | {
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| 170 | return val.date();
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| 171 | }
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| 172 | static time_duration_type get_time_of_day(const time_rep_type& val)
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| 173 | {
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| 174 | if(val.is_special()) {
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| 175 | return time_duration_type(val.get_rep().as_special());
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| 176 | }
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| 177 | else{
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| 178 | return time_duration_type(0,0,0,val.tod());
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| 179 | }
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| 180 | }
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| 181 | static std::string zone_name(const time_rep_type&)
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| 182 | {
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| 183 | return "";
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| 184 | }
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| 185 | static bool is_equal(const time_rep_type& lhs, const time_rep_type& rhs)
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| 186 | {
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| 187 | return (lhs.time_count() == rhs.time_count());
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| 188 | }
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| 189 | static bool is_less(const time_rep_type& lhs, const time_rep_type& rhs)
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| 190 | {
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| 191 | return (lhs.time_count() < rhs.time_count());
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| 192 | }
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| 193 | static time_rep_type add_days(const time_rep_type& base,
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| 194 | const date_duration_type& dd)
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| 195 | {
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| 196 | if(base.is_special() || dd.is_special()) {
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| 197 | return(time_rep_type(base.get_rep() + dd.get_rep()));
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| 198 | }
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| 199 | else {
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| 200 | return time_rep_type(base.time_count() + (dd.days() * time_rep_type::frac_sec_per_day()));
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| 201 | }
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| 202 | }
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| 203 | static time_rep_type subtract_days(const time_rep_type& base,
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| 204 | const date_duration_type& dd)
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| 205 | {
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| 206 | if(base.is_special() || dd.is_special()) {
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| 207 | return(time_rep_type(base.get_rep() - dd.get_rep()));
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| 208 | }
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| 209 | else{
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| 210 | return time_rep_type(base.time_count() - (dd.days() * time_rep_type::frac_sec_per_day()));
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| 211 | }
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| 212 | }
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| 213 | static time_rep_type subtract_time_duration(const time_rep_type& base,
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| 214 | const time_duration_type& td)
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| 215 | {
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| 216 | if(base.is_special() || td.is_special()) {
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| 217 | return(time_rep_type(base.get_rep() - td.get_rep()));
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| 218 | }
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| 219 | else {
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| 220 | return time_rep_type(base.time_count() - td.ticks());
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| 221 | }
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| 222 | }
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| 223 | static time_rep_type add_time_duration(const time_rep_type& base,
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| 224 | time_duration_type td)
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| 225 | {
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| 226 | if(base.is_special() || td.is_special()) {
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| 227 | return(time_rep_type(base.get_rep() + td.get_rep()));
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| 228 | }
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| 229 | else {
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| 230 | return time_rep_type(base.time_count() + td.ticks());
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| 231 | }
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| 232 | }
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| 233 | static time_duration_type subtract_times(const time_rep_type& lhs,
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| 234 | const time_rep_type& rhs)
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| 235 | {
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| 236 | if(lhs.is_special() || rhs.is_special()) {
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| 237 | return(time_duration_type(
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| 238 | impl_type::to_special((lhs.get_rep() - rhs.get_rep()).as_number())));
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| 239 | }
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| 240 | else {
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| 241 | fractional_seconds_type fs = lhs.time_count() - rhs.time_count();
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| 242 | return time_duration_type(0,0,0,fs);
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| 243 | }
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| 244 | }
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| 245 |
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| 246 | };
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| 247 |
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| 248 |
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| 249 | } } //namespace date_time
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| 250 |
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| 251 |
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| 252 |
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| 253 | #endif
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| 254 |
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