std :: chrono time_since_epoch的默认持续时间 [英] std::chrono default duration for time_since_epoch

问题描述

如果我有以下时钟，并使用它来获取从时钟的时代起的计数，这个计数实际上代表什么。

If I have the following clock and use it to get a count of ticks since the clock's epoch, what does this count actually represent.

std::chrono::high_resolution_clock::now().time_since_epoch().count();

例如我刚刚运行这个，并得到 1389375799048790227 。这个数字是什么意思？

For instance I just ran this and got 1389375799048790227. What does this number mean? Is it nanoseconds, microseconds, etc?

推荐答案

持续时间的类型是 std :: chrono： ：high_resolution_clock :: duration 。您可以通过以下方法检查持续时间的滴答期： std :: chrono :: high_resolution_clock :: duration :: period :: num 和 std :: chrono： ：high_resolution_clock :: duration :: period :: den 。这是表示每分钟秒数的分数的分子和分母（例如，对于纳秒为1/1000000000）。

The type of the duration is std::chrono::high_resolution_clock::duration. You can inspect a duration's tick period with: std::chrono::high_resolution_clock::duration::period::num and std::chrono::high_resolution_clock::duration::period::den. This is the numerator and denominator of a fraction representing the amount of seconds per tick (e.g. 1/1000000000 for nanoseconds).

这个纪元是未指定的，但是你是1389375799048790227从您获得结果时的时间间隔。

The epoch is unspecified, but for you is 1389375799048790227 ticks from when you got that result.

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