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1	/// Timestamp used by [crate::sync::Awareness] to tag most recent updates.
2	pub type Timestamp = u64;
3
4	/// A clock trait used to obtain the current time.
5	pub trait Clock: Send + Sync {
6	fn now(&self) -> Timestamp;
7	}
8
9	impl<F> Clock for F
10	where
11	F: Fn() -> Timestamp + Send + Sync,
12	{
13	#[inline]
14	fn now(&self) -> Timestamp {
15	self()
16	}
17	}
18
19	/// A clock which uses standard (non-monotonic) OS date time.
20	#[cfg(not(target_family = "wasm"))]
21	#[derive(Debug, Copy, Clone, Default)]
22	pub struct SystemClock;
23
24	#[cfg(not(target_family = "wasm"))]
25	impl Clock for SystemClock {
26	fn now(&self) -> Timestamp {
27	std::time::SystemTime::now()
28	.duration_since(std::time::UNIX_EPOCH)
29	.unwrap()
30	.as_millis() as Timestamp
31	}
32	}
33