1#ifndef DATE_TIME_TIME_HPP___
2#define DATE_TIME_TIME_HPP___
3
4/* Copyright (c) 2002,2003,2005,2020 CrystalClear Software, Inc.
5 * Use, modification and distribution is subject to the
6 * Boost Software License, Version 1.0. (See accompanying
7 * file LICENSE_1_0.txt or http://www.boost.org/LICENSE_1_0.txt)
8 * Author: Jeff Garland, Bart Garst
9 * $Date$
10 */
11
12
13/*! @file time.hpp
14 This file contains the interface for the time associated classes.
15*/
16#include <string>
17#include <boost/operators.hpp>
18#include <boost/date_time/time_defs.hpp>
19#include <boost/date_time/special_defs.hpp>
20
21namespace boost {
22namespace date_time {
23
24 //! Representation of a precise moment in time, including the date.
25 /*!
26 This class is a skeleton for the interface of a temporal type
27 with a resolution that is higher than a day. It is intended that
28 this class be the base class and that the actual time
29 class be derived using the BN pattern. In this way, the derived
30 class can make decisions such as 'should there be a default constructor'
31 and what should it set its value to, should there be optional constructors
32 say allowing only an time_durations that generate a time from a clock,etc.
33 So, in fact multiple time types can be created for a time_system with
34 different construction policies, and all of them can perform basic
35 operations by only writing a copy constructor. Finally, compiler
36 errors are also shorter.
37
38 The real behavior of the time class is provided by the time_system
39 template parameter. This class must provide all the logic
40 for addition, subtraction, as well as define all the interface
41 types.
42
43 */
44
45 template <class T, class time_system>
46 class base_time : private
47 boost::less_than_comparable<T
48 , boost::equality_comparable<T
49 > >
50 {
51 public:
52 // A tag for type categorization. Can be used to detect Boost.DateTime time points in generic code.
53 typedef void _is_boost_date_time_time_point;
54 typedef T time_type;
55 typedef typename time_system::time_rep_type time_rep_type;
56 typedef typename time_system::date_type date_type;
57 typedef typename time_system::date_duration_type date_duration_type;
58 typedef typename time_system::time_duration_type time_duration_type;
59 //typedef typename time_system::hms_type hms_type;
60
61 BOOST_CXX14_CONSTEXPR
62 base_time(const date_type& day,
63 const time_duration_type& td,
64 dst_flags dst=not_dst) :
65 time_(time_system::get_time_rep(day, td, dst))
66 {}
67 BOOST_CXX14_CONSTEXPR
68 base_time(special_values sv) :
69 time_(time_system::get_time_rep(sv))
70 {}
71 BOOST_CXX14_CONSTEXPR
72 base_time(const time_rep_type& rhs) :
73 time_(rhs)
74 {}
75 BOOST_CXX14_CONSTEXPR
76 date_type date() const
77 {
78 return time_system::get_date(time_);
79 }
80 BOOST_CXX14_CONSTEXPR
81 time_duration_type time_of_day() const
82 {
83 return time_system::get_time_of_day(time_);
84 }
85 /*! Optional bool parameter will return time zone as an offset
86 * (ie "+07:00"). Empty string is returned for classes that do
87 * not use a time_zone */
88 std::string zone_name(bool /*as_offset*/=false) const
89 {
90 return time_system::zone_name(time_);
91 }
92 /*! Optional bool parameter will return time zone as an offset
93 * (ie "+07:00"). Empty string is returned for classes that do
94 * not use a time_zone */
95 std::string zone_abbrev(bool /*as_offset*/=false) const
96 {
97 return time_system::zone_name(time_);
98 }
99 //! An empty string is returned for classes that do not use a time_zone
100 std::string zone_as_posix_string() const
101 {
102 return std::string();
103 }
104
105 //! check to see if date is not a value
106 BOOST_CXX14_CONSTEXPR
107 bool is_not_a_date_time() const
108 {
109 return time_.is_not_a_date_time();
110 }
111 //! check to see if date is one of the infinity values
112 BOOST_CXX14_CONSTEXPR
113 bool is_infinity() const
114 {
115 return (is_pos_infinity() || is_neg_infinity());
116 }
117 //! check to see if date is greater than all possible dates
118 BOOST_CXX14_CONSTEXPR
119 bool is_pos_infinity() const
120 {
121 return time_.is_pos_infinity();
122 }
123 //! check to see if date is greater than all possible dates
124 BOOST_CXX14_CONSTEXPR
125 bool is_neg_infinity() const
126 {
127 return time_.is_neg_infinity();
128 }
129 //! check to see if time is a special value
130 BOOST_CXX14_CONSTEXPR
131 bool is_special() const
132 {
133 return(is_not_a_date_time() || is_infinity());
134 }
135 //!Equality operator -- others generated by boost::equality_comparable
136 BOOST_CXX14_CONSTEXPR
137 bool operator==(const time_type& rhs) const
138 {
139 return time_system::is_equal(time_,rhs.time_);
140 }
141 //!Equality operator -- others generated by boost::less_than_comparable
142 BOOST_CXX14_CONSTEXPR
143 bool operator<(const time_type& rhs) const
144 {
145 return time_system::is_less(time_,rhs.time_);
146 }
147 //! difference between two times
148 BOOST_CXX14_CONSTEXPR
149 time_duration_type operator-(const time_type& rhs) const
150 {
151 return time_system::subtract_times(time_, rhs.time_);
152 }
153 //! add date durations
154 BOOST_CXX14_CONSTEXPR
155 time_type operator+(const date_duration_type& dd) const
156 {
157 return time_system::add_days(time_, dd);
158 }
159 BOOST_CXX14_CONSTEXPR
160 time_type operator+=(const date_duration_type& dd)
161 {
162 time_ = (time_system::get_time_rep(date() + dd, time_of_day()));
163 return time_type(time_);
164 }
165 //! subtract date durations
166 BOOST_CXX14_CONSTEXPR
167 time_type operator-(const date_duration_type& dd) const
168 {
169 return time_system::subtract_days(time_, dd);
170 }
171 BOOST_CXX14_CONSTEXPR
172 time_type operator-=(const date_duration_type& dd)
173 {
174 time_ = (time_system::get_time_rep(date() - dd, time_of_day()));
175 return time_type(time_);
176 }
177 //! add time durations
178 BOOST_CXX14_CONSTEXPR
179 time_type operator+(const time_duration_type& td) const
180 {
181 return time_type(time_system::add_time_duration(time_, td));
182 }
183 BOOST_CXX14_CONSTEXPR
184 time_type operator+=(const time_duration_type& td)
185 {
186 time_ = time_system::add_time_duration(time_,td);
187 return time_type(time_);
188 }
189 //! subtract time durations
190 BOOST_CXX14_CONSTEXPR
191 time_type operator-(const time_duration_type& rhs) const
192 {
193 return time_system::subtract_time_duration(time_, rhs);
194 }
195 BOOST_CXX14_CONSTEXPR
196 time_type operator-=(const time_duration_type& td)
197 {
198 time_ = time_system::subtract_time_duration(time_, td);
199 return time_type(time_);
200 }
201
202 protected:
203 time_rep_type time_;
204 };
205
206
207
208
209
210} } //namespace date_time::boost
211
212
213#endif
214
215

source code of boost/libs/date_time/include/boost/date_time/time.hpp