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implement nth_back for Fuse

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This commit is contained in:
Adrian Friedli 2019-04-16 21:40:50 +02:00
parent cc2689a253
commit fae2a68ba2
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1 changed files with 16 additions and 0 deletions
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16
src/libcore/iter/adapters/mod.rs
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@ -1789,6 +1789,17 @@ impl<I> DoubleEndedIterator for Fuse<I> where I: DoubleEndedIterator {
}
}
#[inline]
default fn nth_back(&mut self, n: usize) -> Option<<I as Iterator>::Item> {
if self.done {
None
} else {
let nth = self.iter.nth_back(n);
self.done = nth.is_none();
nth
}
}
#[inline]
default fn try_rfold<Acc, Fold, R>(&mut self, init: Acc, fold: Fold) -> R where
Self: Sized, Fold: FnMut(Acc, Self::Item) -> R, R: Try<Ok=Acc>
@ -1877,6 +1888,11 @@ impl<I> DoubleEndedIterator for Fuse<I>
self.iter.next_back()
}
#[inline]
fn nth_back(&mut self, n: usize) -> Option<<I as Iterator>::Item> {
self.iter.nth_back(n)
}
#[inline]
fn try_rfold<Acc, Fold, R>(&mut self, init: Acc, fold: Fold) -> R where
Self: Sized, Fold: FnMut(Acc, Self::Item) -> R, R: Try<Ok=Acc>