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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