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Fixed internal overflow on subtraiton in elapsed and duration

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This commit is contained in:
Per Lindgren 2019-11-18 16:36:17 +01:00
parent 725d5e1aa9
commit dfab15ed78
2 changed files with 9 additions and 2 deletions
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6
src/cyccnt.rs
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@ -38,12 +38,14 @@ impl Instant {
/// Returns the amount of time elapsed since this instant was created.
pub fn elapsed(&self) -> Duration {
Instant::now() - *self
let diff = Instant::now().inner.wrapping_sub(self.inner);
assert!(diff >= 0, "instant now is earlier than self");
Duration { inner: diff as u32 }
}
/// Returns the amount of time elapsed from another instant to this one.
pub fn duration_since(&self, earlier: Instant) -> Duration {
let diff = self.inner - earlier.inner;
let diff = self.inner.wrapping_sub(earlier.inner);
assert!(diff >= 0, "second instant is later than self");
Duration { inner: diff as u32 }
}