Struct Stopwatch 

pub struct Stopwatch(/* private fields */);

Elapsed real time, for measuring how long a piece of work took.

Deliberately not a Clock. A clock answers “what instant is this” for values the store keeps — commit stamps, created_at, expiry comparisons — and tests pin it so those come out deterministic. Measuring a duration needs the opposite guarantees: a reading that only moves forward, never jumps when the system clock is corrected, and reports the real elapsed time even while a pinned clock says no time has passed. Both live here so ambient time has one owner.

Nothing durable derives from a stopwatch — only diagnostics read one — so how long a run took never changes what it produces.

Implementations

impl Stopwatch

pub fn start() -> Self

Starts measuring from now.

pub fn elapsed(&self) -> Duration

Real time since start.