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Add implementations of last in terms of next_back on a bunch of DoubleEndedIterators.

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r?Manishearth
This commit is contained in:
Kyle Huey 2019-04-19 21:13:37 -07:00
parent 8aaae4294b
commit 3e86cf36b5
14 changed files with 159 additions and 0 deletions
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14
src/liballoc/vec.rs
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@ -2385,6 +2385,11 @@ impl<T> Iterator for IntoIter<T> {
fn count(self) -> usize {
self.len()
}
#[inline]
fn last(mut self) -> Option<T> {
self.next_back()
}
}
#[stable(feature = "rust1", since = "1.0.0")]
@ -2504,6 +2509,11 @@ impl<T> Iterator for Drain<'_, T> {
fn size_hint(&self) -> (usize, Option<usize>) {
self.iter.size_hint()
}
#[inline]
fn last(mut self) -> Option<T> {
self.next_back()
}
}
#[stable(feature = "drain", since = "1.6.0")]
@ -2573,6 +2583,10 @@ impl<I: Iterator> Iterator for Splice<'_, I> {
fn size_hint(&self) -> (usize, Option<usize>) {
self.drain.size_hint()
}
fn last(mut self) -> Option<Self::Item> {
self.next_back()
}
}
#[stable(feature = "vec_splice", since = "1.21.0")]