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fix advance_by impl for vec_deque and add tests

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This commit is contained in:
The 8472 2023-03-27 14:56:14 +02:00
parent 9cd9da2cd1
commit 41807938d2
2 changed files with 30 additions and 7 deletions
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12
library/alloc/src/collections/vec_deque/into_iter.rs
View File

@ -56,10 +56,10 @@ impl<T, A: Allocator> Iterator for IntoIter<T, A> {
#[inline]
fn advance_by(&mut self, n: usize) -> Result<(), NonZeroUsize> {
let rem = if self.inner.len < n {
let len = self.inner.len;
let rem = if len < n {
self.inner.clear();
len - n
n - len
} else {
self.inner.drain(..n);
0
@ -186,12 +186,12 @@ impl<T, A: Allocator> DoubleEndedIterator for IntoIter<T, A> {
#[inline]
fn advance_back_by(&mut self, n: usize) -> Result<(), NonZeroUsize> {
let len = self.inner.len;
let rem = if len >= n {
self.inner.truncate(len - n);
0
} else {
let rem = if len < n {
self.inner.clear();
n - len
} else {
self.inner.truncate(len - n);
0
};
NonZeroUsize::new(rem).map_or(Ok(()), Err)
}

23
library/alloc/tests/vec_deque.rs
View File

@ -1,3 +1,4 @@
use core::num::NonZeroUsize;
use std::assert_matches::assert_matches;
use std::collections::TryReserveErrorKind::*;
use std::collections::{vec_deque::Drain, VecDeque};
@ -426,6 +427,28 @@ fn test_into_iter() {
assert_eq!(it.next(), Some(7));
assert_eq!(it.size_hint(), (5, Some(5)));
}
// advance_by
{
let mut d = VecDeque::new();
for i in 0..=4 {
d.push_back(i);
}
for i in 6..=8 {
d.push_front(i);
}
let mut it = d.into_iter();
assert_eq!(it.advance_by(1), Ok(()));
assert_eq!(it.next(), Some(7));
assert_eq!(it.advance_back_by(1), Ok(()));
assert_eq!(it.next_back(), Some(3));
let mut it = VecDeque::from(vec![1, 2, 3, 4, 5]).into_iter();
assert_eq!(it.advance_by(10), Err(NonZeroUsize::new(5).unwrap()));
let mut it = VecDeque::from(vec![1, 2, 3, 4, 5]).into_iter();
assert_eq!(it.advance_back_by(10), Err(NonZeroUsize::new(5).unwrap()));
}
}
#[test]