An arithmetic type or a class emulating an arithmetic type
The representation type of C1::duration.
a specialization of ratio
The tick period of the clock in seconds.
The duration type of the clock.
chrono::time_point<C1> or chrono::time_point<C2, C1::duration>
The time_point type of the clock.
C1 and C2 shall refer to the same epoch.
true if t1 <= t2 is always true and the time between clock ticks is constant, otherwise false.
Returns a time_point object representing the current point in time.