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Lazily compute Iterator len #295

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merged 1 commit into from
Oct 30, 2024
Merged

Lazily compute Iterator len #295

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17 changes: 17 additions & 0 deletions roaring/src/bitmap/container.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -300,6 +300,21 @@ impl Iterator for Iter<'_> {
fn next(&mut self) -> Option<u32> {
self.inner.next().map(|i| util::join(self.key, i))
}

fn size_hint(&self) -> (usize, Option<usize>) {
self.inner.size_hint()
}

fn count(self) -> usize
where
Self: Sized,
{
self.inner.count()
}

fn nth(&mut self, n: usize) -> Option<Self::Item> {
self.inner.nth(n).map(|i| util::join(self.key, i))
}
}

impl DoubleEndedIterator for Iter<'_> {
Expand All @@ -308,6 +323,8 @@ impl DoubleEndedIterator for Iter<'_> {
}
}

impl ExactSizeIterator for Iter<'_> {}

impl fmt::Debug for Container {
fn fmt(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
format!("Container<{:?} @ {:?}>", self.len(), self.key).fmt(formatter)
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