255 lines
8.5 KiB
Plaintext
255 lines
8.5 KiB
Plaintext
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#ifndef DATE_TIME_TIME_SYSTEM_COUNTED_HPP
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#define DATE_TIME_TIME_SYSTEM_COUNTED_HPP
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/* Copyright (c) 2002,2003 CrystalClear Software, Inc.
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* Use, modification and distribution is subject to the
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* Boost Software License, Version 1.0. (See accompanying
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* file LICENSE_1_0.txt or http://www.boost.org/LICENSE_1_0.txt)
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* Author: Jeff Garland, Bart Garst
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* $Date$
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*/
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#include "boost/date_time/time_defs.hpp"
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#include <string>
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namespace boost {
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namespace date_time {
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//! Time representation that uses a single integer count
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template<class config>
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struct counted_time_rep
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{
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typedef typename config::int_type int_type;
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typedef typename config::date_type date_type;
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typedef typename config::impl_type impl_type;
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typedef typename date_type::duration_type date_duration_type;
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typedef typename date_type::calendar_type calendar_type;
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typedef typename date_type::ymd_type ymd_type;
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typedef typename config::time_duration_type time_duration_type;
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typedef typename config::resolution_traits resolution_traits;
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counted_time_rep(const date_type& d, const time_duration_type& time_of_day)
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: time_count_(1)
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{
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if(d.is_infinity() || d.is_not_a_date() || time_of_day.is_special()) {
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time_count_ = time_of_day.get_rep() + d.day_count();
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//std::cout << time_count_ << std::endl;
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}
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else {
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time_count_ = (d.day_number() * frac_sec_per_day()) + time_of_day.ticks();
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}
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}
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explicit counted_time_rep(int_type count) :
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time_count_(count)
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{}
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explicit counted_time_rep(impl_type count) :
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time_count_(count)
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{}
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date_type date() const
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{
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if(time_count_.is_special()) {
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return date_type(time_count_.as_special());
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}
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else {
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typename calendar_type::date_int_type dc = static_cast<typename calendar_type::date_int_type>(day_count());
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//std::cout << "time_rep here:" << dc << std::endl;
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ymd_type ymd = calendar_type::from_day_number(dc);
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return date_type(ymd);
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}
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}
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//int_type day_count() const
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unsigned long day_count() const
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{
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/* resolution_traits::as_number returns a boost::int64_t &
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* frac_sec_per_day is also a boost::int64_t so, naturally,
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* the division operation returns a boost::int64_t.
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* The static_cast to an unsigned long is ok (results in no data loss)
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* because frac_sec_per_day is either the number of
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* microseconds per day, or the number of nanoseconds per day.
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* Worst case scenario: resolution_traits::as_number returns the
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* maximum value an int64_t can hold and frac_sec_per_day
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* is microseconds per day (lowest possible value).
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* The division operation will then return a value of 106751991 -
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* easily fitting in an unsigned long.
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*/
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return static_cast<unsigned long>(resolution_traits::as_number(time_count_) / frac_sec_per_day());
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}
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int_type time_count() const
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{
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return resolution_traits::as_number(time_count_);
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}
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int_type tod() const
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{
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return resolution_traits::as_number(time_count_) % frac_sec_per_day();
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}
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static int_type frac_sec_per_day()
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{
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int_type seconds_per_day = 60*60*24;
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int_type fractional_sec_per_sec(resolution_traits::res_adjust());
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return seconds_per_day*fractional_sec_per_sec;
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}
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bool is_pos_infinity()const
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{
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return impl_type::is_pos_inf(time_count_.as_number());
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}
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bool is_neg_infinity()const
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{
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return impl_type::is_neg_inf(time_count_.as_number());
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}
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bool is_not_a_date_time()const
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{
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return impl_type::is_not_a_number(time_count_.as_number());
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}
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bool is_special()const
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{
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return time_count_.is_special();
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}
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impl_type get_rep()const
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{
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return time_count_;
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}
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private:
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impl_type time_count_;
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};
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//! An unadjusted time system implementation.
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template<class time_rep>
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class counted_time_system
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{
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public:
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typedef time_rep time_rep_type;
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typedef typename time_rep_type::impl_type impl_type;
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typedef typename time_rep_type::time_duration_type time_duration_type;
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typedef typename time_duration_type::fractional_seconds_type fractional_seconds_type;
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typedef typename time_rep_type::date_type date_type;
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typedef typename time_rep_type::date_duration_type date_duration_type;
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template<class T> static void unused_var(const T&) {}
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static time_rep_type get_time_rep(const date_type& day,
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const time_duration_type& tod,
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date_time::dst_flags dst=not_dst)
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{
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unused_var(dst);
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return time_rep_type(day, tod);
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}
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static time_rep_type get_time_rep(special_values sv)
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{
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switch (sv) {
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case not_a_date_time:
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return time_rep_type(date_type(not_a_date_time),
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time_duration_type(not_a_date_time));
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case pos_infin:
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return time_rep_type(date_type(pos_infin),
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time_duration_type(pos_infin));
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case neg_infin:
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return time_rep_type(date_type(neg_infin),
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time_duration_type(neg_infin));
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case max_date_time: {
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time_duration_type td = time_duration_type(24,0,0,0) - time_duration_type(0,0,0,1);
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return time_rep_type(date_type(max_date_time), td);
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}
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case min_date_time:
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return time_rep_type(date_type(min_date_time), time_duration_type(0,0,0,0));
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default:
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return time_rep_type(date_type(not_a_date_time),
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time_duration_type(not_a_date_time));
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}
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}
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static date_type get_date(const time_rep_type& val)
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{
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return val.date();
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}
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static time_duration_type get_time_of_day(const time_rep_type& val)
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{
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if(val.is_special()) {
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return time_duration_type(val.get_rep().as_special());
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}
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else{
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return time_duration_type(0,0,0,val.tod());
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}
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}
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static std::string zone_name(const time_rep_type&)
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{
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return "";
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}
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static bool is_equal(const time_rep_type& lhs, const time_rep_type& rhs)
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{
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return (lhs.time_count() == rhs.time_count());
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}
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static bool is_less(const time_rep_type& lhs, const time_rep_type& rhs)
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{
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return (lhs.time_count() < rhs.time_count());
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}
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static time_rep_type add_days(const time_rep_type& base,
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const date_duration_type& dd)
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{
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if(base.is_special() || dd.is_special()) {
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return(time_rep_type(base.get_rep() + dd.get_rep()));
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}
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else {
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return time_rep_type(base.time_count() + (dd.days() * time_rep_type::frac_sec_per_day()));
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}
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}
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static time_rep_type subtract_days(const time_rep_type& base,
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const date_duration_type& dd)
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{
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if(base.is_special() || dd.is_special()) {
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return(time_rep_type(base.get_rep() - dd.get_rep()));
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}
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else{
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return time_rep_type(base.time_count() - (dd.days() * time_rep_type::frac_sec_per_day()));
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}
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}
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static time_rep_type subtract_time_duration(const time_rep_type& base,
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const time_duration_type& td)
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{
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if(base.is_special() || td.is_special()) {
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return(time_rep_type(base.get_rep() - td.get_rep()));
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}
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else {
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return time_rep_type(base.time_count() - td.ticks());
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}
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}
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static time_rep_type add_time_duration(const time_rep_type& base,
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time_duration_type td)
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{
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if(base.is_special() || td.is_special()) {
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return(time_rep_type(base.get_rep() + td.get_rep()));
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}
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else {
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return time_rep_type(base.time_count() + td.ticks());
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}
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}
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static time_duration_type subtract_times(const time_rep_type& lhs,
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const time_rep_type& rhs)
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{
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if(lhs.is_special() || rhs.is_special()) {
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return(time_duration_type(
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impl_type::to_special((lhs.get_rep() - rhs.get_rep()).as_number())));
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}
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else {
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fractional_seconds_type fs = lhs.time_count() - rhs.time_count();
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return time_duration_type(0,0,0,fs);
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}
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}
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};
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} } //namespace date_time
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#endif
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