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Upgrade implementation of StepBy<RangeInclusive<_>>.

This commit is contained in:
kennytm 2018-06-23 01:42:29 +08:00
parent d299f03e28
commit b6ea93e464
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1 changed files with 5 additions and 3 deletions
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8
src/libcore/iter/mod.rs
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@ -787,17 +787,19 @@ where
#[inline]
fn spec_next(&mut self) -> Option<Self::Item> {
self.first_take = false;
if !(self.iter.start <= self.iter.end) {
if self.iter.is_empty() {
self.iter.is_iterating = Some(false);
return None;
}
// add 1 to self.step to get original step size back
// it was decremented for the general case on construction
if let Some(n) = self.iter.start.add_usize(self.step+1) {
self.iter.is_iterating = Some(n <= self.iter.end);
let next = mem::replace(&mut self.iter.start, n);
Some(next)
} else {
let last = self.iter.start.replace_one();
self.iter.end.replace_zero();
let last = self.iter.start.clone();
self.iter.is_iterating = Some(false);
Some(last)
}
}