[time.clock.req] (original) (raw)
In Table 129 C1 and C2 denote clock types.
t1 andt2 are values returned by C1::now() where the call returning t1 happens before ([intro.multithread]) the call returning t2 and both of these calls occur before C1::time_point::max().
[Note 1:
This means C1 did not wrap around between t1 andt2.
— _end note_]
Table 129 — Cpp17Clock requirements [tab:time.clock]
| 🔗Expression | Return type | Operational semantics |
|---|---|---|
| 🔗C1::rep | An arithmetic type or a class emulating an arithmetic type | The representation type of C1::duration. |
| 🔗C1::period | a specialization of ratio | The tick period of the clock in seconds. |
| 🔗C1::duration | chrono::duration<C1::rep, C1::period> | The duration type of the clock. |
| 🔗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. |
| 🔗C1::is_steady | const bool | true if t1 <= t2 is always true and the time between clock ticks is constant, otherwise false. |
| 🔗C1::now() | C1::time_point | Returns a time_point object representing the current point in time. |