类
duration
- count
- 内部计数，不一定是值
time_point
system_clock
- now
- 获取当前时间
steady_clock
high_resolution_clock
treat_as_floating_point
duration_values
common_type(duration)
函数
duration_cast
time_point_cast
类型
| type | Representation | Period |
| hours | signed integral type of at least 23 bits | ratio<3600,1> |
| minutes | signed integral type of at least 29 bits | ratio<60,1> |
| seconds | signed integral type of at least 35 bits | ratio<1,1> |
| milliseconds | signed integral type of at least 45 bits | ratio<1,1000> |
| microseconds | signed integral type of at least 55 bits | ratio<1,1000000> |
| nanoseconds | signed integral type of at least 64 bits | ratio<1,1000000000> |
hours
minutes
seconds
milliseconds
microseconds
nanoseconds
使用
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