30 Time library [time]

30.3 Cpp17Clock requirements [time.clock.req]

Table 131 — Cpp17Clock requirements [tab:time.clock]
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Expression
Return type
Operational semantics
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C1​::​rep
An arithmetic type or a class emulating an arithmetic type
The representation type of C1​::​duration.
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C1​::​period
a specialization of ratio
The tick period of the clock in seconds.
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C1​::​duration
chrono​::​duration<C1​::​rep, C1​::​period>
The duration type of the clock.
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C1​::​time_point
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.
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C1​::​is_steady
const bool
true if t1 <= t2 is always true and the time between clock ticks is constant, otherwise false.
C1​::​is_steady shall be usable in constant expressions ([expr.const]).
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C1​::​now()
C1​::​time_point
Returns a time_point object representing the current point in time.