What are the knowledge points of censor 11 chrono

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Chrono is the time library in C++ 11, providing timing, clock and other functions.

The key to learning chrono is to understand the concepts of time period (Durations) and time point (Time points).

1. Precision:

Clock beat (time accuracy):

Template class ratio

Where N represents the numerator and D represents the denominator, which defaults to the unit of time expressed in seconds.

N corresponds to its member num,D corresponds to its member den

Commonly used units:

Ratio minute

Ratio second

Ratio millisecond

...

The main purpose of ratio is to provide precision (units) for the time period, time point, etc., which will be explained later.

# include#includeusing namespace std;int main () {cout