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1 // <chrono> -*- C++ -*-
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2
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145
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3 // Copyright (C) 2008-2020 Free Software Foundation, Inc.
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111
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4 //
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5 // This file is part of the GNU ISO C++ Library. This library is free
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6 // software; you can redistribute it and/or modify it under the
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7 // terms of the GNU General Public License as published by the
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8 // Free Software Foundation; either version 3, or (at your option)
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9 // any later version.
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10
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11 // This library is distributed in the hope that it will be useful,
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12 // but WITHOUT ANY WARRANTY; without even the implied warranty of
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13 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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14 // GNU General Public License for more details.
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15
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16 // Under Section 7 of GPL version 3, you are granted additional
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17 // permissions described in the GCC Runtime Library Exception, version
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18 // 3.1, as published by the Free Software Foundation.
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19
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20 // You should have received a copy of the GNU General Public License and
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21 // a copy of the GCC Runtime Library Exception along with this program;
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22 // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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23 // <http://www.gnu.org/licenses/>.
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24
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25 /** @file include/chrono
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26 * This is a Standard C++ Library header.
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145
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27 * @ingroup chrono
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111
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28 */
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29
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30 #ifndef _GLIBCXX_CHRONO
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31 #define _GLIBCXX_CHRONO 1
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32
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33 #pragma GCC system_header
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34
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35 #if __cplusplus < 201103L
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36 # include <bits/c++0x_warning.h>
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37 #else
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38
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39 #include <ratio>
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40 #include <type_traits>
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41 #include <limits>
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42 #include <ctime>
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43 #include <bits/parse_numbers.h> // for literals support.
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44
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45 namespace std _GLIBCXX_VISIBILITY(default)
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46 {
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47 _GLIBCXX_BEGIN_NAMESPACE_VERSION
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48
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49 /**
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50 * @defgroup chrono Time
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51 * @ingroup utilities
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52 *
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53 * Classes and functions for time.
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54 * @{
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55 */
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56
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57 /** @namespace std::chrono
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58 * @brief ISO C++ 2011 namespace for date and time utilities
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59 */
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60 namespace chrono
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61 {
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62 template<typename _Rep, typename _Period = ratio<1>>
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63 struct duration;
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64
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65 template<typename _Clock, typename _Dur = typename _Clock::duration>
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66 struct time_point;
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67 }
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68
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69 // 20.11.4.3 specialization of common_type (for duration, sfinae-friendly)
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70
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145
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71 /// @cond undocumented
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72
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73 template<typename _CT, typename _Period1, typename _Period2, typename = void>
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74 struct __duration_common_type
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75 { };
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76
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111
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77 template<typename _CT, typename _Period1, typename _Period2>
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78 struct __duration_common_type<_CT, _Period1, _Period2,
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79 __void_t<typename _CT::type>>
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111
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80 {
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81 private:
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145
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82 using __gcd_num = __static_gcd<_Period1::num, _Period2::num>;
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83 using __gcd_den = __static_gcd<_Period1::den, _Period2::den>;
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84 using __cr = typename _CT::type;
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85 using __r = ratio<__gcd_num::value,
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86 (_Period1::den / __gcd_den::value) * _Period2::den>;
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87
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88 public:
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89 using type = chrono::duration<__cr, __r>;
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90 };
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91
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92 template<typename _Period1, typename _Period2>
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93 struct __duration_common_type<__failure_type, _Period1, _Period2>
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94 { typedef __failure_type type; };
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95
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145
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96 /// @endcond
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97
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98 /// Specialization of common_type for chrono::duration types.
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99 /// @relates duration
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100 template<typename _Rep1, typename _Period1, typename _Rep2, typename _Period2>
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101 struct common_type<chrono::duration<_Rep1, _Period1>,
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102 chrono::duration<_Rep2, _Period2>>
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103 : __duration_common_type<common_type<_Rep1, _Rep2>, _Period1, _Period2>
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111
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104 { };
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105
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106 // 20.11.4.3 specialization of common_type (for time_point, sfinae-friendly)
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107
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145
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108 /// @cond undocumented
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109
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110 template<typename _CT, typename _Clock, typename = void>
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111 struct __timepoint_common_type
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112 { };
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113
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114 template<typename _CT, typename _Clock>
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115 struct __timepoint_common_type<_CT, _Clock, __void_t<typename _CT::type>>
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116 {
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117 using type = chrono::time_point<_Clock, typename _CT::type>;
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111
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118 };
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119
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145
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120 /// @endcond
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121
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145
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122 /// Specialization of common_type for chrono::time_point types.
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123 /// @relates time_point
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124 template<typename _Clock, typename _Duration1, typename _Duration2>
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125 struct common_type<chrono::time_point<_Clock, _Duration1>,
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126 chrono::time_point<_Clock, _Duration2>>
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127 : __timepoint_common_type<common_type<_Duration1, _Duration2>, _Clock>
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128 { };
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129
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145
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130 // @} group chrono
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131
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132 namespace chrono
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133 {
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145
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134 /// @addtogroup chrono
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135 /// @{
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136
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137 /// @cond undocumented
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138
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139 // Primary template for duration_cast impl.
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140 template<typename _ToDur, typename _CF, typename _CR,
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141 bool _NumIsOne = false, bool _DenIsOne = false>
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142 struct __duration_cast_impl
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143 {
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144 template<typename _Rep, typename _Period>
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145 static constexpr _ToDur
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146 __cast(const duration<_Rep, _Period>& __d)
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147 {
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148 typedef typename _ToDur::rep __to_rep;
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149 return _ToDur(static_cast<__to_rep>(static_cast<_CR>(__d.count())
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150 * static_cast<_CR>(_CF::num)
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151 / static_cast<_CR>(_CF::den)));
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152 }
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153 };
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154
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155 template<typename _ToDur, typename _CF, typename _CR>
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156 struct __duration_cast_impl<_ToDur, _CF, _CR, true, true>
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157 {
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158 template<typename _Rep, typename _Period>
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159 static constexpr _ToDur
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160 __cast(const duration<_Rep, _Period>& __d)
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161 {
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162 typedef typename _ToDur::rep __to_rep;
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163 return _ToDur(static_cast<__to_rep>(__d.count()));
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164 }
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165 };
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166
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167 template<typename _ToDur, typename _CF, typename _CR>
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168 struct __duration_cast_impl<_ToDur, _CF, _CR, true, false>
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169 {
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170 template<typename _Rep, typename _Period>
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171 static constexpr _ToDur
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172 __cast(const duration<_Rep, _Period>& __d)
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173 {
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174 typedef typename _ToDur::rep __to_rep;
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175 return _ToDur(static_cast<__to_rep>(
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176 static_cast<_CR>(__d.count()) / static_cast<_CR>(_CF::den)));
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177 }
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178 };
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179
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180 template<typename _ToDur, typename _CF, typename _CR>
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181 struct __duration_cast_impl<_ToDur, _CF, _CR, false, true>
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182 {
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183 template<typename _Rep, typename _Period>
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184 static constexpr _ToDur
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185 __cast(const duration<_Rep, _Period>& __d)
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186 {
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187 typedef typename _ToDur::rep __to_rep;
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188 return _ToDur(static_cast<__to_rep>(
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189 static_cast<_CR>(__d.count()) * static_cast<_CR>(_CF::num)));
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190 }
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191 };
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192
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193 template<typename _Tp>
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194 struct __is_duration
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195 : std::false_type
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196 { };
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197
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198 template<typename _Rep, typename _Period>
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199 struct __is_duration<duration<_Rep, _Period>>
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200 : std::true_type
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201 { };
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202
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203 template<typename _Tp>
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204 using __enable_if_is_duration
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205 = typename enable_if<__is_duration<_Tp>::value, _Tp>::type;
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206
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207 template<typename _Tp>
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208 using __disable_if_is_duration
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209 = typename enable_if<!__is_duration<_Tp>::value, _Tp>::type;
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210
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211 /// @endcond
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212
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213 /// duration_cast
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214 template<typename _ToDur, typename _Rep, typename _Period>
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215 constexpr __enable_if_is_duration<_ToDur>
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216 duration_cast(const duration<_Rep, _Period>& __d)
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217 {
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218 typedef typename _ToDur::period __to_period;
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219 typedef typename _ToDur::rep __to_rep;
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220 typedef ratio_divide<_Period, __to_period> __cf;
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221 typedef typename common_type<__to_rep, _Rep, intmax_t>::type
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222 __cr;
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223 typedef __duration_cast_impl<_ToDur, __cf, __cr,
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224 __cf::num == 1, __cf::den == 1> __dc;
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225 return __dc::__cast(__d);
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226 }
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227
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228 /// treat_as_floating_point
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229 template<typename _Rep>
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230 struct treat_as_floating_point
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231 : is_floating_point<_Rep>
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232 { };
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233
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234 #if __cplusplus > 201402L
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235 template <typename _Rep>
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236 inline constexpr bool treat_as_floating_point_v =
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237 treat_as_floating_point<_Rep>::value;
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238 #endif // C++17
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239
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240 #if __cplusplus >= 201703L
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241 # define __cpp_lib_chrono 201611
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242
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243 template<typename _ToDur, typename _Rep, typename _Period>
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244 constexpr __enable_if_is_duration<_ToDur>
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245 floor(const duration<_Rep, _Period>& __d)
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246 {
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247 auto __to = chrono::duration_cast<_ToDur>(__d);
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248 if (__to > __d)
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249 return __to - _ToDur{1};
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250 return __to;
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251 }
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252
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253 template<typename _ToDur, typename _Rep, typename _Period>
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254 constexpr __enable_if_is_duration<_ToDur>
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255 ceil(const duration<_Rep, _Period>& __d)
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256 {
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257 auto __to = chrono::duration_cast<_ToDur>(__d);
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258 if (__to < __d)
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259 return __to + _ToDur{1};
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260 return __to;
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261 }
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262
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263 template <typename _ToDur, typename _Rep, typename _Period>
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264 constexpr enable_if_t<
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265 __and_<__is_duration<_ToDur>,
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266 __not_<treat_as_floating_point<typename _ToDur::rep>>>::value,
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267 _ToDur>
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268 round(const duration<_Rep, _Period>& __d)
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269 {
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270 _ToDur __t0 = chrono::floor<_ToDur>(__d);
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271 _ToDur __t1 = __t0 + _ToDur{1};
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272 auto __diff0 = __d - __t0;
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273 auto __diff1 = __t1 - __d;
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274 if (__diff0 == __diff1)
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275 {
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276 if (__t0.count() & 1)
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277 return __t1;
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278 return __t0;
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279 }
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280 else if (__diff0 < __diff1)
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281 return __t0;
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282 return __t1;
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283 }
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284
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285 template<typename _Rep, typename _Period>
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286 constexpr
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287 enable_if_t<numeric_limits<_Rep>::is_signed, duration<_Rep, _Period>>
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288 abs(duration<_Rep, _Period> __d)
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289 {
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290 if (__d >= __d.zero())
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291 return __d;
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292 return -__d;
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293 }
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294 #endif // C++17
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295
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296 /// duration_values
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297 template<typename _Rep>
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298 struct duration_values
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299 {
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300 static constexpr _Rep
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301 zero() noexcept
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111
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302 { return _Rep(0); }
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303
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304 static constexpr _Rep
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305 max() noexcept
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111
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306 { return numeric_limits<_Rep>::max(); }
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307
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308 static constexpr _Rep
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309 min() noexcept
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111
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310 { return numeric_limits<_Rep>::lowest(); }
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311 };
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312
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145
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313 /// @cond undocumented
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314
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111
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315 template<typename _Tp>
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316 struct __is_ratio
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317 : std::false_type
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318 { };
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319
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320 template<intmax_t _Num, intmax_t _Den>
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321 struct __is_ratio<ratio<_Num, _Den>>
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322 : std::true_type
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323 { };
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324
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325 /// @endcond
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326
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327 /// duration
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328 template<typename _Rep, typename _Period>
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329 struct duration
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330 {
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331 private:
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332 template<typename _Rep2>
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333 using __is_float = treat_as_floating_point<_Rep2>;
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334
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335 // _Period2 is an exact multiple of _Period
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336 template<typename _Period2>
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337 using __is_harmonic
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338 = __bool_constant<ratio_divide<_Period2, _Period>::den == 1>;
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339
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340 public:
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341
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342 typedef _Rep rep;
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343 typedef _Period period;
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344
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345 static_assert(!__is_duration<_Rep>::value, "rep cannot be a duration");
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346 static_assert(__is_ratio<_Period>::value,
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347 "period must be a specialization of ratio");
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348 static_assert(_Period::num > 0, "period must be positive");
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349
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350 // 20.11.5.1 construction / copy / destroy
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351 constexpr duration() = default;
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352
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353 duration(const duration&) = default;
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354
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131
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355 // _GLIBCXX_RESOLVE_LIB_DEFECTS
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356 // 3050. Conversion specification problem in chrono::duration
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111
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357 template<typename _Rep2, typename = _Require<
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131
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358 is_convertible<const _Rep2&, rep>,
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359 __or_<__is_float<rep>, __not_<__is_float<_Rep2>>>>>
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360 constexpr explicit duration(const _Rep2& __rep)
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361 : __r(static_cast<rep>(__rep)) { }
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362
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363 template<typename _Rep2, typename _Period2, typename = _Require<
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364 __or_<__is_float<rep>,
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365 __and_<__is_harmonic<_Period2>,
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366 __not_<__is_float<_Rep2>>>>>>
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367 constexpr duration(const duration<_Rep2, _Period2>& __d)
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368 : __r(duration_cast<duration>(__d).count()) { }
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369
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370 ~duration() = default;
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371 duration& operator=(const duration&) = default;
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372
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373 // 20.11.5.2 observer
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374 constexpr rep
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375 count() const
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376 { return __r; }
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377
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378 // 20.11.5.3 arithmetic
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379 constexpr duration
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380 operator+() const
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381 { return *this; }
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382
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383 constexpr duration
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384 operator-() const
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385 { return duration(-__r); }
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386
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387 _GLIBCXX17_CONSTEXPR duration&
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388 operator++()
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389 {
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390 ++__r;
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391 return *this;
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392 }
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393
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394 _GLIBCXX17_CONSTEXPR duration
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395 operator++(int)
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396 { return duration(__r++); }
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397
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398 _GLIBCXX17_CONSTEXPR duration&
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399 operator--()
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400 {
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401 --__r;
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402 return *this;
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403 }
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404
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405 _GLIBCXX17_CONSTEXPR duration
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406 operator--(int)
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407 { return duration(__r--); }
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408
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409 _GLIBCXX17_CONSTEXPR duration&
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410 operator+=(const duration& __d)
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411 {
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412 __r += __d.count();
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413 return *this;
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414 }
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415
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|
|
416 _GLIBCXX17_CONSTEXPR duration&
|
|
|
417 operator-=(const duration& __d)
|
|
|
418 {
|
|
|
419 __r -= __d.count();
|
|
|
420 return *this;
|
|
|
421 }
|
|
|
422
|
|
|
423 _GLIBCXX17_CONSTEXPR duration&
|
|
|
424 operator*=(const rep& __rhs)
|
|
|
425 {
|
|
|
426 __r *= __rhs;
|
|
|
427 return *this;
|
|
|
428 }
|
|
|
429
|
|
|
430 _GLIBCXX17_CONSTEXPR duration&
|
|
|
431 operator/=(const rep& __rhs)
|
|
|
432 {
|
|
|
433 __r /= __rhs;
|
|
|
434 return *this;
|
|
|
435 }
|
|
|
436
|
|
|
437 // DR 934.
|
|
|
438 template<typename _Rep2 = rep>
|
|
|
439 _GLIBCXX17_CONSTEXPR
|
|
|
440 typename enable_if<!treat_as_floating_point<_Rep2>::value,
|
|
|
441 duration&>::type
|
|
|
442 operator%=(const rep& __rhs)
|
|
|
443 {
|
|
|
444 __r %= __rhs;
|
|
|
445 return *this;
|
|
|
446 }
|
|
|
447
|
|
|
448 template<typename _Rep2 = rep>
|
|
|
449 _GLIBCXX17_CONSTEXPR
|
|
|
450 typename enable_if<!treat_as_floating_point<_Rep2>::value,
|
|
|
451 duration&>::type
|
|
|
452 operator%=(const duration& __d)
|
|
|
453 {
|
|
|
454 __r %= __d.count();
|
|
|
455 return *this;
|
|
|
456 }
|
|
|
457
|
|
|
458 // 20.11.5.4 special values
|
|
|
459 static constexpr duration
|
|
145
|
460 zero() noexcept
|
|
111
|
461 { return duration(duration_values<rep>::zero()); }
|
|
|
462
|
|
|
463 static constexpr duration
|
|
145
|
464 min() noexcept
|
|
111
|
465 { return duration(duration_values<rep>::min()); }
|
|
|
466
|
|
|
467 static constexpr duration
|
|
145
|
468 max() noexcept
|
|
111
|
469 { return duration(duration_values<rep>::max()); }
|
|
|
470
|
|
|
471 private:
|
|
|
472 rep __r;
|
|
|
473 };
|
|
|
474
|
|
145
|
475 /// @relates duration @{
|
|
|
476
|
|
|
477 /// The sum of two durations.
|
|
111
|
478 template<typename _Rep1, typename _Period1,
|
|
|
479 typename _Rep2, typename _Period2>
|
|
|
480 constexpr typename common_type<duration<_Rep1, _Period1>,
|
|
|
481 duration<_Rep2, _Period2>>::type
|
|
|
482 operator+(const duration<_Rep1, _Period1>& __lhs,
|
|
|
483 const duration<_Rep2, _Period2>& __rhs)
|
|
|
484 {
|
|
|
485 typedef duration<_Rep1, _Period1> __dur1;
|
|
|
486 typedef duration<_Rep2, _Period2> __dur2;
|
|
|
487 typedef typename common_type<__dur1,__dur2>::type __cd;
|
|
|
488 return __cd(__cd(__lhs).count() + __cd(__rhs).count());
|
|
|
489 }
|
|
|
490
|
|
145
|
491 /// The difference between two durations.
|
|
111
|
492 template<typename _Rep1, typename _Period1,
|
|
|
493 typename _Rep2, typename _Period2>
|
|
|
494 constexpr typename common_type<duration<_Rep1, _Period1>,
|
|
|
495 duration<_Rep2, _Period2>>::type
|
|
|
496 operator-(const duration<_Rep1, _Period1>& __lhs,
|
|
|
497 const duration<_Rep2, _Period2>& __rhs)
|
|
|
498 {
|
|
|
499 typedef duration<_Rep1, _Period1> __dur1;
|
|
|
500 typedef duration<_Rep2, _Period2> __dur2;
|
|
|
501 typedef typename common_type<__dur1,__dur2>::type __cd;
|
|
|
502 return __cd(__cd(__lhs).count() - __cd(__rhs).count());
|
|
|
503 }
|
|
|
504
|
|
145
|
505 /// @}
|
|
|
506
|
|
|
507 /// @cond undocumented
|
|
|
508
|
|
111
|
509 // SFINAE helper to obtain common_type<_Rep1, _Rep2> only if _Rep2
|
|
|
510 // is implicitly convertible to it.
|
|
131
|
511 // _GLIBCXX_RESOLVE_LIB_DEFECTS
|
|
|
512 // 3050. Conversion specification problem in chrono::duration constructor
|
|
111
|
513 template<typename _Rep1, typename _Rep2,
|
|
|
514 typename _CRep = typename common_type<_Rep1, _Rep2>::type>
|
|
131
|
515 using __common_rep_t = typename
|
|
|
516 enable_if<is_convertible<const _Rep2&, _CRep>::value, _CRep>::type;
|
|
111
|
517
|
|
145
|
518 /// @endcond
|
|
|
519
|
|
|
520 /// @relates duration @{
|
|
|
521
|
|
|
522 /// Multiply a duration by a scalar value.
|
|
111
|
523 template<typename _Rep1, typename _Period, typename _Rep2>
|
|
|
524 constexpr duration<__common_rep_t<_Rep1, _Rep2>, _Period>
|
|
|
525 operator*(const duration<_Rep1, _Period>& __d, const _Rep2& __s)
|
|
|
526 {
|
|
|
527 typedef duration<typename common_type<_Rep1, _Rep2>::type, _Period>
|
|
|
528 __cd;
|
|
|
529 return __cd(__cd(__d).count() * __s);
|
|
|
530 }
|
|
|
531
|
|
145
|
532 /// Multiply a duration by a scalar value.
|
|
111
|
533 template<typename _Rep1, typename _Rep2, typename _Period>
|
|
|
534 constexpr duration<__common_rep_t<_Rep2, _Rep1>, _Period>
|
|
|
535 operator*(const _Rep1& __s, const duration<_Rep2, _Period>& __d)
|
|
|
536 { return __d * __s; }
|
|
|
537
|
|
|
538 template<typename _Rep1, typename _Period, typename _Rep2>
|
|
|
539 constexpr
|
|
|
540 duration<__common_rep_t<_Rep1, __disable_if_is_duration<_Rep2>>, _Period>
|
|
|
541 operator/(const duration<_Rep1, _Period>& __d, const _Rep2& __s)
|
|
|
542 {
|
|
|
543 typedef duration<typename common_type<_Rep1, _Rep2>::type, _Period>
|
|
|
544 __cd;
|
|
|
545 return __cd(__cd(__d).count() / __s);
|
|
|
546 }
|
|
|
547
|
|
|
548 template<typename _Rep1, typename _Period1,
|
|
|
549 typename _Rep2, typename _Period2>
|
|
|
550 constexpr typename common_type<_Rep1, _Rep2>::type
|
|
|
551 operator/(const duration<_Rep1, _Period1>& __lhs,
|
|
|
552 const duration<_Rep2, _Period2>& __rhs)
|
|
|
553 {
|
|
|
554 typedef duration<_Rep1, _Period1> __dur1;
|
|
|
555 typedef duration<_Rep2, _Period2> __dur2;
|
|
|
556 typedef typename common_type<__dur1,__dur2>::type __cd;
|
|
|
557 return __cd(__lhs).count() / __cd(__rhs).count();
|
|
|
558 }
|
|
|
559
|
|
|
560 // DR 934.
|
|
|
561 template<typename _Rep1, typename _Period, typename _Rep2>
|
|
|
562 constexpr
|
|
|
563 duration<__common_rep_t<_Rep1, __disable_if_is_duration<_Rep2>>, _Period>
|
|
|
564 operator%(const duration<_Rep1, _Period>& __d, const _Rep2& __s)
|
|
|
565 {
|
|
|
566 typedef duration<typename common_type<_Rep1, _Rep2>::type, _Period>
|
|
|
567 __cd;
|
|
|
568 return __cd(__cd(__d).count() % __s);
|
|
|
569 }
|
|
|
570
|
|
|
571 template<typename _Rep1, typename _Period1,
|
|
|
572 typename _Rep2, typename _Period2>
|
|
|
573 constexpr typename common_type<duration<_Rep1, _Period1>,
|
|
|
574 duration<_Rep2, _Period2>>::type
|
|
|
575 operator%(const duration<_Rep1, _Period1>& __lhs,
|
|
|
576 const duration<_Rep2, _Period2>& __rhs)
|
|
|
577 {
|
|
|
578 typedef duration<_Rep1, _Period1> __dur1;
|
|
|
579 typedef duration<_Rep2, _Period2> __dur2;
|
|
|
580 typedef typename common_type<__dur1,__dur2>::type __cd;
|
|
|
581 return __cd(__cd(__lhs).count() % __cd(__rhs).count());
|
|
|
582 }
|
|
|
583
|
|
|
584 // comparisons
|
|
145
|
585
|
|
111
|
586 template<typename _Rep1, typename _Period1,
|
|
|
587 typename _Rep2, typename _Period2>
|
|
|
588 constexpr bool
|
|
|
589 operator==(const duration<_Rep1, _Period1>& __lhs,
|
|
|
590 const duration<_Rep2, _Period2>& __rhs)
|
|
|
591 {
|
|
|
592 typedef duration<_Rep1, _Period1> __dur1;
|
|
|
593 typedef duration<_Rep2, _Period2> __dur2;
|
|
|
594 typedef typename common_type<__dur1,__dur2>::type __ct;
|
|
|
595 return __ct(__lhs).count() == __ct(__rhs).count();
|
|
|
596 }
|
|
|
597
|
|
|
598 template<typename _Rep1, typename _Period1,
|
|
|
599 typename _Rep2, typename _Period2>
|
|
|
600 constexpr bool
|
|
|
601 operator<(const duration<_Rep1, _Period1>& __lhs,
|
|
|
602 const duration<_Rep2, _Period2>& __rhs)
|
|
|
603 {
|
|
|
604 typedef duration<_Rep1, _Period1> __dur1;
|
|
|
605 typedef duration<_Rep2, _Period2> __dur2;
|
|
|
606 typedef typename common_type<__dur1,__dur2>::type __ct;
|
|
|
607 return __ct(__lhs).count() < __ct(__rhs).count();
|
|
|
608 }
|
|
|
609
|
|
|
610 template<typename _Rep1, typename _Period1,
|
|
|
611 typename _Rep2, typename _Period2>
|
|
|
612 constexpr bool
|
|
|
613 operator!=(const duration<_Rep1, _Period1>& __lhs,
|
|
|
614 const duration<_Rep2, _Period2>& __rhs)
|
|
|
615 { return !(__lhs == __rhs); }
|
|
|
616
|
|
|
617 template<typename _Rep1, typename _Period1,
|
|
|
618 typename _Rep2, typename _Period2>
|
|
|
619 constexpr bool
|
|
|
620 operator<=(const duration<_Rep1, _Period1>& __lhs,
|
|
|
621 const duration<_Rep2, _Period2>& __rhs)
|
|
|
622 { return !(__rhs < __lhs); }
|
|
|
623
|
|
|
624 template<typename _Rep1, typename _Period1,
|
|
|
625 typename _Rep2, typename _Period2>
|
|
|
626 constexpr bool
|
|
|
627 operator>(const duration<_Rep1, _Period1>& __lhs,
|
|
|
628 const duration<_Rep2, _Period2>& __rhs)
|
|
|
629 { return __rhs < __lhs; }
|
|
|
630
|
|
|
631 template<typename _Rep1, typename _Period1,
|
|
|
632 typename _Rep2, typename _Period2>
|
|
|
633 constexpr bool
|
|
|
634 operator>=(const duration<_Rep1, _Period1>& __lhs,
|
|
|
635 const duration<_Rep2, _Period2>& __rhs)
|
|
|
636 { return !(__lhs < __rhs); }
|
|
|
637
|
|
145
|
638 /// @}
|
|
|
639
|
|
131
|
640 #ifdef _GLIBCXX_USE_C99_STDINT_TR1
|
|
|
641 # define _GLIBCXX_CHRONO_INT64_T int64_t
|
|
|
642 #elif defined __INT64_TYPE__
|
|
|
643 # define _GLIBCXX_CHRONO_INT64_T __INT64_TYPE__
|
|
|
644 #else
|
|
|
645 static_assert(std::numeric_limits<unsigned long long>::digits >= 64,
|
|
|
646 "Representation type for nanoseconds must have at least 64 bits");
|
|
|
647 # define _GLIBCXX_CHRONO_INT64_T long long
|
|
|
648 #endif
|
|
|
649
|
|
111
|
650 /// nanoseconds
|
|
131
|
651 typedef duration<_GLIBCXX_CHRONO_INT64_T, nano> nanoseconds;
|
|
111
|
652
|
|
|
653 /// microseconds
|
|
131
|
654 typedef duration<_GLIBCXX_CHRONO_INT64_T, micro> microseconds;
|
|
111
|
655
|
|
|
656 /// milliseconds
|
|
131
|
657 typedef duration<_GLIBCXX_CHRONO_INT64_T, milli> milliseconds;
|
|
111
|
658
|
|
|
659 /// seconds
|
|
131
|
660 typedef duration<_GLIBCXX_CHRONO_INT64_T> seconds;
|
|
111
|
661
|
|
|
662 /// minutes
|
|
131
|
663 typedef duration<_GLIBCXX_CHRONO_INT64_T, ratio< 60>> minutes;
|
|
111
|
664
|
|
|
665 /// hours
|
|
131
|
666 typedef duration<_GLIBCXX_CHRONO_INT64_T, ratio<3600>> hours;
|
|
|
667
|
|
|
668 #undef _GLIBCXX_CHRONO_INT64_T
|
|
111
|
669
|
|
|
670 /// time_point
|
|
|
671 template<typename _Clock, typename _Dur>
|
|
|
672 struct time_point
|
|
|
673 {
|
|
|
674 typedef _Clock clock;
|
|
|
675 typedef _Dur duration;
|
|
|
676 typedef typename duration::rep rep;
|
|
|
677 typedef typename duration::period period;
|
|
|
678
|
|
|
679 constexpr time_point() : __d(duration::zero())
|
|
|
680 { }
|
|
|
681
|
|
|
682 constexpr explicit time_point(const duration& __dur)
|
|
|
683 : __d(__dur)
|
|
|
684 { }
|
|
|
685
|
|
|
686 // conversions
|
|
|
687 template<typename _Dur2,
|
|
|
688 typename = _Require<is_convertible<_Dur2, _Dur>>>
|
|
|
689 constexpr time_point(const time_point<clock, _Dur2>& __t)
|
|
|
690 : __d(__t.time_since_epoch())
|
|
|
691 { }
|
|
|
692
|
|
|
693 // observer
|
|
|
694 constexpr duration
|
|
|
695 time_since_epoch() const
|
|
|
696 { return __d; }
|
|
|
697
|
|
|
698 // arithmetic
|
|
|
699 _GLIBCXX17_CONSTEXPR time_point&
|
|
|
700 operator+=(const duration& __dur)
|
|
|
701 {
|
|
|
702 __d += __dur;
|
|
|
703 return *this;
|
|
|
704 }
|
|
|
705
|
|
|
706 _GLIBCXX17_CONSTEXPR time_point&
|
|
|
707 operator-=(const duration& __dur)
|
|
|
708 {
|
|
|
709 __d -= __dur;
|
|
|
710 return *this;
|
|
|
711 }
|
|
|
712
|
|
|
713 // special values
|
|
|
714 static constexpr time_point
|
|
145
|
715 min() noexcept
|
|
111
|
716 { return time_point(duration::min()); }
|
|
|
717
|
|
|
718 static constexpr time_point
|
|
145
|
719 max() noexcept
|
|
111
|
720 { return time_point(duration::max()); }
|
|
|
721
|
|
|
722 private:
|
|
|
723 duration __d;
|
|
|
724 };
|
|
|
725
|
|
|
726 /// time_point_cast
|
|
|
727 template<typename _ToDur, typename _Clock, typename _Dur>
|
|
|
728 constexpr typename enable_if<__is_duration<_ToDur>::value,
|
|
|
729 time_point<_Clock, _ToDur>>::type
|
|
|
730 time_point_cast(const time_point<_Clock, _Dur>& __t)
|
|
|
731 {
|
|
|
732 typedef time_point<_Clock, _ToDur> __time_point;
|
|
|
733 return __time_point(duration_cast<_ToDur>(__t.time_since_epoch()));
|
|
|
734 }
|
|
|
735
|
|
|
736 #if __cplusplus > 201402L
|
|
|
737 template<typename _ToDur, typename _Clock, typename _Dur>
|
|
|
738 constexpr
|
|
|
739 enable_if_t<__is_duration<_ToDur>::value, time_point<_Clock, _ToDur>>
|
|
|
740 floor(const time_point<_Clock, _Dur>& __tp)
|
|
|
741 {
|
|
|
742 return time_point<_Clock, _ToDur>{
|
|
|
743 chrono::floor<_ToDur>(__tp.time_since_epoch())};
|
|
|
744 }
|
|
|
745
|
|
|
746 template<typename _ToDur, typename _Clock, typename _Dur>
|
|
|
747 constexpr
|
|
|
748 enable_if_t<__is_duration<_ToDur>::value, time_point<_Clock, _ToDur>>
|
|
|
749 ceil(const time_point<_Clock, _Dur>& __tp)
|
|
|
750 {
|
|
|
751 return time_point<_Clock, _ToDur>{
|
|
|
752 chrono::ceil<_ToDur>(__tp.time_since_epoch())};
|
|
|
753 }
|
|
|
754
|
|
|
755 template<typename _ToDur, typename _Clock, typename _Dur>
|
|
|
756 constexpr enable_if_t<
|
|
|
757 __and_<__is_duration<_ToDur>,
|
|
|
758 __not_<treat_as_floating_point<typename _ToDur::rep>>>::value,
|
|
|
759 time_point<_Clock, _ToDur>>
|
|
|
760 round(const time_point<_Clock, _Dur>& __tp)
|
|
|
761 {
|
|
|
762 return time_point<_Clock, _ToDur>{
|
|
|
763 chrono::round<_ToDur>(__tp.time_since_epoch())};
|
|
|
764 }
|
|
|
765 #endif // C++17
|
|
|
766
|
|
145
|
767 /// @relates time_point @{
|
|
|
768
|
|
|
769 /// Adjust a time point forwards by the given duration.
|
|
111
|
770 template<typename _Clock, typename _Dur1,
|
|
|
771 typename _Rep2, typename _Period2>
|
|
|
772 constexpr time_point<_Clock,
|
|
|
773 typename common_type<_Dur1, duration<_Rep2, _Period2>>::type>
|
|
|
774 operator+(const time_point<_Clock, _Dur1>& __lhs,
|
|
|
775 const duration<_Rep2, _Period2>& __rhs)
|
|
|
776 {
|
|
|
777 typedef duration<_Rep2, _Period2> __dur2;
|
|
|
778 typedef typename common_type<_Dur1,__dur2>::type __ct;
|
|
|
779 typedef time_point<_Clock, __ct> __time_point;
|
|
|
780 return __time_point(__lhs.time_since_epoch() + __rhs);
|
|
|
781 }
|
|
|
782
|
|
145
|
783 /// Adjust a time point forwards by the given duration.
|
|
111
|
784 template<typename _Rep1, typename _Period1,
|
|
|
785 typename _Clock, typename _Dur2>
|
|
|
786 constexpr time_point<_Clock,
|
|
|
787 typename common_type<duration<_Rep1, _Period1>, _Dur2>::type>
|
|
|
788 operator+(const duration<_Rep1, _Period1>& __lhs,
|
|
|
789 const time_point<_Clock, _Dur2>& __rhs)
|
|
|
790 {
|
|
|
791 typedef duration<_Rep1, _Period1> __dur1;
|
|
|
792 typedef typename common_type<__dur1,_Dur2>::type __ct;
|
|
|
793 typedef time_point<_Clock, __ct> __time_point;
|
|
|
794 return __time_point(__rhs.time_since_epoch() + __lhs);
|
|
|
795 }
|
|
|
796
|
|
145
|
797 /// Adjust a time point backwards by the given duration.
|
|
111
|
798 template<typename _Clock, typename _Dur1,
|
|
|
799 typename _Rep2, typename _Period2>
|
|
|
800 constexpr time_point<_Clock,
|
|
|
801 typename common_type<_Dur1, duration<_Rep2, _Period2>>::type>
|
|
|
802 operator-(const time_point<_Clock, _Dur1>& __lhs,
|
|
|
803 const duration<_Rep2, _Period2>& __rhs)
|
|
|
804 {
|
|
|
805 typedef duration<_Rep2, _Period2> __dur2;
|
|
|
806 typedef typename common_type<_Dur1,__dur2>::type __ct;
|
|
|
807 typedef time_point<_Clock, __ct> __time_point;
|
|
|
808 return __time_point(__lhs.time_since_epoch() -__rhs);
|
|
|
809 }
|
|
|
810
|
|
145
|
811 /// @}
|
|
|
812
|
|
|
813 /// @relates time_point @{
|
|
|
814
|
|
|
815 /// The difference between two time points (as a duration)
|
|
111
|
816 template<typename _Clock, typename _Dur1, typename _Dur2>
|
|
|
817 constexpr typename common_type<_Dur1, _Dur2>::type
|
|
|
818 operator-(const time_point<_Clock, _Dur1>& __lhs,
|
|
|
819 const time_point<_Clock, _Dur2>& __rhs)
|
|
|
820 { return __lhs.time_since_epoch() - __rhs.time_since_epoch(); }
|
|
|
821
|
|
|
822 template<typename _Clock, typename _Dur1, typename _Dur2>
|
|
|
823 constexpr bool
|
|
|
824 operator==(const time_point<_Clock, _Dur1>& __lhs,
|
|
|
825 const time_point<_Clock, _Dur2>& __rhs)
|
|
|
826 { return __lhs.time_since_epoch() == __rhs.time_since_epoch(); }
|
|
|
827
|
|
|
828 template<typename _Clock, typename _Dur1, typename _Dur2>
|
|
|
829 constexpr bool
|
|
|
830 operator!=(const time_point<_Clock, _Dur1>& __lhs,
|
|
|
831 const time_point<_Clock, _Dur2>& __rhs)
|
|
|
832 { return !(__lhs == __rhs); }
|
|
|
833
|
|
|
834 template<typename _Clock, typename _Dur1, typename _Dur2>
|
|
|
835 constexpr bool
|
|
|
836 operator<(const time_point<_Clock, _Dur1>& __lhs,
|
|
|
837 const time_point<_Clock, _Dur2>& __rhs)
|
|
|
838 { return __lhs.time_since_epoch() < __rhs.time_since_epoch(); }
|
|
|
839
|
|
|
840 template<typename _Clock, typename _Dur1, typename _Dur2>
|
|
|
841 constexpr bool
|
|
|
842 operator<=(const time_point<_Clock, _Dur1>& __lhs,
|
|
|
843 const time_point<_Clock, _Dur2>& __rhs)
|
|
|
844 { return !(__rhs < __lhs); }
|
|
|
845
|
|
|
846 template<typename _Clock, typename _Dur1, typename _Dur2>
|
|
|
847 constexpr bool
|
|
|
848 operator>(const time_point<_Clock, _Dur1>& __lhs,
|
|
|
849 const time_point<_Clock, _Dur2>& __rhs)
|
|
|
850 { return __rhs < __lhs; }
|
|
|
851
|
|
|
852 template<typename _Clock, typename _Dur1, typename _Dur2>
|
|
|
853 constexpr bool
|
|
|
854 operator>=(const time_point<_Clock, _Dur1>& __lhs,
|
|
|
855 const time_point<_Clock, _Dur2>& __rhs)
|
|
|
856 { return !(__lhs < __rhs); }
|
|
|
857
|
|
145
|
858 // @}
|
|
111
|
859
|
|
|
860 // Clocks.
|
|
|
861
|
|
|
862 // Why nanosecond resolution as the default?
|
|
|
863 // Why have std::system_clock always count in the highest
|
|
|
864 // resolution (ie nanoseconds), even if on some OSes the low 3
|
|
|
865 // or 9 decimal digits will be always zero? This allows later
|
|
|
866 // implementations to change the system_clock::now()
|
|
|
867 // implementation any time to provide better resolution without
|
|
|
868 // changing function signature or units.
|
|
|
869
|
|
|
870 // To support the (forward) evolution of the library's defined
|
|
|
871 // clocks, wrap inside inline namespace so that the current
|
|
|
872 // defintions of system_clock, steady_clock, and
|
|
|
873 // high_resolution_clock types are uniquely mangled. This way, new
|
|
|
874 // code can use the latests clocks, while the library can contain
|
|
|
875 // compatibility definitions for previous versions. At some
|
|
|
876 // point, when these clocks settle down, the inlined namespaces
|
|
|
877 // can be removed. XXX GLIBCXX_ABI Deprecated
|
|
|
878 inline namespace _V2 {
|
|
|
879
|
|
|
880 /**
|
|
|
881 * @brief System clock.
|
|
|
882 *
|
|
|
883 * Time returned represents wall time from the system-wide clock.
|
|
145
|
884 * @ingroup chrono
|
|
111
|
885 */
|
|
|
886 struct system_clock
|
|
|
887 {
|
|
|
888 typedef chrono::nanoseconds duration;
|
|
|
889 typedef duration::rep rep;
|
|
|
890 typedef duration::period period;
|
|
|
891 typedef chrono::time_point<system_clock, duration> time_point;
|
|
|
892
|
|
|
893 static_assert(system_clock::duration::min()
|
|
|
894 < system_clock::duration::zero(),
|
|
|
895 "a clock's minimum duration cannot be less than its epoch");
|
|
|
896
|
|
|
897 static constexpr bool is_steady = false;
|
|
|
898
|
|
|
899 static time_point
|
|
|
900 now() noexcept;
|
|
|
901
|
|
|
902 // Map to C API
|
|
|
903 static std::time_t
|
|
|
904 to_time_t(const time_point& __t) noexcept
|
|
|
905 {
|
|
|
906 return std::time_t(duration_cast<chrono::seconds>
|
|
|
907 (__t.time_since_epoch()).count());
|
|
|
908 }
|
|
|
909
|
|
|
910 static time_point
|
|
|
911 from_time_t(std::time_t __t) noexcept
|
|
|
912 {
|
|
|
913 typedef chrono::time_point<system_clock, seconds> __from;
|
|
|
914 return time_point_cast<system_clock::duration>
|
|
|
915 (__from(chrono::seconds(__t)));
|
|
|
916 }
|
|
|
917 };
|
|
|
918
|
|
|
919
|
|
|
920 /**
|
|
|
921 * @brief Monotonic clock
|
|
|
922 *
|
|
|
923 * Time returned has the property of only increasing at a uniform rate.
|
|
145
|
924 * @ingroup chrono
|
|
111
|
925 */
|
|
|
926 struct steady_clock
|
|
|
927 {
|
|
|
928 typedef chrono::nanoseconds duration;
|
|
|
929 typedef duration::rep rep;
|
|
|
930 typedef duration::period period;
|
|
|
931 typedef chrono::time_point<steady_clock, duration> time_point;
|
|
|
932
|
|
|
933 static constexpr bool is_steady = true;
|
|
|
934
|
|
|
935 static time_point
|
|
|
936 now() noexcept;
|
|
|
937 };
|
|
|
938
|
|
|
939
|
|
|
940 /**
|
|
|
941 * @brief Highest-resolution clock
|
|
|
942 *
|
|
|
943 * This is the clock "with the shortest tick period." Alias to
|
|
|
944 * std::system_clock until higher-than-nanosecond definitions
|
|
|
945 * become feasible.
|
|
145
|
946 * @ingroup chrono
|
|
111
|
947 */
|
|
|
948 using high_resolution_clock = system_clock;
|
|
|
949
|
|
|
950 } // end inline namespace _V2
|
|
145
|
951 // @}
|
|
111
|
952 } // namespace chrono
|
|
|
953
|
|
|
954 #if __cplusplus > 201103L
|
|
|
955
|
|
|
956 #define __cpp_lib_chrono_udls 201304
|
|
|
957
|
|
|
958 inline namespace literals
|
|
|
959 {
|
|
145
|
960 /** ISO C++ 2014 namespace for suffixes for duration literals.
|
|
|
961 *
|
|
|
962 * These suffixes can be used to create `chrono::duration` values with
|
|
|
963 * tick periods of hours, minutes, seconds, milliseconds, microseconds
|
|
|
964 * or nanoseconds. For example, `std::chrono::seconds(5)` can be written
|
|
|
965 * as `5s` after making the suffix visible in the current scope.
|
|
|
966 * The suffixes can be made visible by a using-directive or
|
|
|
967 * using-declaration such as:
|
|
|
968 * - `using namespace std::chrono_literals;`
|
|
|
969 * - `using namespace std::literals;`
|
|
|
970 * - `using namespace std::chrono;`
|
|
|
971 * - `using namespace std;`
|
|
|
972 * - `using std::chrono_literals::operator""s;`
|
|
|
973 *
|
|
|
974 * The result of these suffixes on an integer literal is one of the
|
|
|
975 * standard typedefs such as `std::chrono::hours`.
|
|
|
976 * The result on a floating-point literal is a duration type with the
|
|
|
977 * specified tick period and an unspecified floating-point representation,
|
|
|
978 * for example `1.5e2ms` might be equivalent to
|
|
|
979 * `chrono::duration<long double, chrono::milli>(1.5e2)`.
|
|
|
980 *
|
|
|
981 * @ingroup chrono
|
|
|
982 */
|
|
111
|
983 inline namespace chrono_literals
|
|
|
984 {
|
|
131
|
985 #pragma GCC diagnostic push
|
|
|
986 #pragma GCC diagnostic ignored "-Wliteral-suffix"
|
|
145
|
987 /// @cond undocumented
|
|
111
|
988 template<typename _Dur, char... _Digits>
|
|
|
989 constexpr _Dur __check_overflow()
|
|
|
990 {
|
|
|
991 using _Val = __parse_int::_Parse_int<_Digits...>;
|
|
131
|
992 constexpr typename _Dur::rep __repval = _Val::value;
|
|
|
993 static_assert(__repval >= 0 && __repval == _Val::value,
|
|
|
994 "literal value cannot be represented by duration type");
|
|
|
995 return _Dur(__repval);
|
|
111
|
996 }
|
|
145
|
997 /// @endcond
|
|
111
|
998
|
|
145
|
999 /// Literal suffix for durations representing non-integer hours
|
|
111
|
1000 constexpr chrono::duration<long double, ratio<3600,1>>
|
|
|
1001 operator""h(long double __hours)
|
|
|
1002 { return chrono::duration<long double, ratio<3600,1>>{__hours}; }
|
|
|
1003
|
|
145
|
1004 /// Literal suffix for durations of type `std::chrono::hours`
|
|
111
|
1005 template <char... _Digits>
|
|
|
1006 constexpr chrono::hours
|
|
|
1007 operator""h()
|
|
|
1008 { return __check_overflow<chrono::hours, _Digits...>(); }
|
|
|
1009
|
|
145
|
1010 /// Literal suffix for durations representing non-integer minutes
|
|
111
|
1011 constexpr chrono::duration<long double, ratio<60,1>>
|
|
|
1012 operator""min(long double __mins)
|
|
|
1013 { return chrono::duration<long double, ratio<60,1>>{__mins}; }
|
|
|
1014
|
|
145
|
1015 /// Literal suffix for durations of type `std::chrono::minutes`
|
|
111
|
1016 template <char... _Digits>
|
|
|
1017 constexpr chrono::minutes
|
|
|
1018 operator""min()
|
|
|
1019 { return __check_overflow<chrono::minutes, _Digits...>(); }
|
|
|
1020
|
|
145
|
1021 /// Literal suffix for durations representing non-integer seconds
|
|
111
|
1022 constexpr chrono::duration<long double>
|
|
|
1023 operator""s(long double __secs)
|
|
|
1024 { return chrono::duration<long double>{__secs}; }
|
|
|
1025
|
|
145
|
1026 /// Literal suffix for durations of type `std::chrono::seconds`
|
|
111
|
1027 template <char... _Digits>
|
|
|
1028 constexpr chrono::seconds
|
|
|
1029 operator""s()
|
|
|
1030 { return __check_overflow<chrono::seconds, _Digits...>(); }
|
|
|
1031
|
|
145
|
1032 /// Literal suffix for durations representing non-integer milliseconds
|
|
111
|
1033 constexpr chrono::duration<long double, milli>
|
|
|
1034 operator""ms(long double __msecs)
|
|
|
1035 { return chrono::duration<long double, milli>{__msecs}; }
|
|
|
1036
|
|
145
|
1037 /// Literal suffix for durations of type `std::chrono::milliseconds`
|
|
111
|
1038 template <char... _Digits>
|
|
|
1039 constexpr chrono::milliseconds
|
|
|
1040 operator""ms()
|
|
|
1041 { return __check_overflow<chrono::milliseconds, _Digits...>(); }
|
|
|
1042
|
|
145
|
1043 /// Literal suffix for durations representing non-integer microseconds
|
|
111
|
1044 constexpr chrono::duration<long double, micro>
|
|
|
1045 operator""us(long double __usecs)
|
|
|
1046 { return chrono::duration<long double, micro>{__usecs}; }
|
|
|
1047
|
|
145
|
1048 /// Literal suffix for durations of type `std::chrono::microseconds`
|
|
111
|
1049 template <char... _Digits>
|
|
|
1050 constexpr chrono::microseconds
|
|
|
1051 operator""us()
|
|
|
1052 { return __check_overflow<chrono::microseconds, _Digits...>(); }
|
|
|
1053
|
|
145
|
1054 /// Literal suffix for durations representing non-integer nanoseconds
|
|
111
|
1055 constexpr chrono::duration<long double, nano>
|
|
|
1056 operator""ns(long double __nsecs)
|
|
|
1057 { return chrono::duration<long double, nano>{__nsecs}; }
|
|
|
1058
|
|
145
|
1059 /// Literal suffix for durations of type `std::chrono::nanoseconds`
|
|
111
|
1060 template <char... _Digits>
|
|
|
1061 constexpr chrono::nanoseconds
|
|
|
1062 operator""ns()
|
|
|
1063 { return __check_overflow<chrono::nanoseconds, _Digits...>(); }
|
|
|
1064
|
|
131
|
1065 #pragma GCC diagnostic pop
|
|
111
|
1066 } // inline namespace chrono_literals
|
|
|
1067 } // inline namespace literals
|
|
|
1068
|
|
|
1069 namespace chrono
|
|
|
1070 {
|
|
|
1071 using namespace literals::chrono_literals;
|
|
|
1072 } // namespace chrono
|
|
|
1073
|
|
131
|
1074 #endif // C++14
|
|
111
|
1075
|
|
|
1076 _GLIBCXX_END_NAMESPACE_VERSION
|
|
|
1077 } // namespace std
|
|
|
1078
|
|
|
1079 #endif // C++11
|
|
|
1080
|
|
|
1081 #endif //_GLIBCXX_CHRONO
|
