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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