std::chrono::duration - Cppreference - PUCRS std::chrono::duration:: count. 头文件：类模板：template>class duration;类模板 std::chrono::duration 表示时间间隔。它由 Rep 类型的计次数和计次周期组成，其中计次周期是一个编译期有理数常量，表示从一个计次到下一个的秒数。存储于 duration 的数据仅有 Rep 类型的计次数。 It consists of a count of ticks of type Rep and a tick period, where the tick period is a compile-time rational constant representing the number of seconds from one tick to the next. Class template std::duration represents a time interval. If Rep is floating point, then the duration can represent fractions of ticks. std::chrono::duration::count - cppreference.com Represents a duration with millisecond resolution. chrono durations std::chrono::duration:: count. std First we capture the portion of the duration which can be represented by a round number of seconds. 4) Constructs a duration by converting d to an appropriate period and tick count, as if by std:: chrono:: duration_cast < duration > (d).

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