1 use std::time::Instant; 2 3 /// Returns [`Instant`] values representing the current instant in time. 4 /// 5 /// This allows customizing the source of time which is especially useful for 6 /// testing. 7 /// 8 /// Implementations must ensure that calls to `now` return monotonically 9 /// increasing [`Instant`] values. 10 /// 11 /// [`Instant`]: https://doc.rust-lang.org/std/time/struct.Instant.html 12 pub trait Now: Send + Sync + 'static { 13 /// Returns an instant corresponding to "now". now(&self) -> Instant14 fn now(&self) -> Instant; 15 } 16