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-rw-r--r--vendor/rayon/src/vec.rs44
1 files changed, 23 insertions, 21 deletions
diff --git a/vendor/rayon/src/vec.rs b/vendor/rayon/src/vec.rs
index e07963922..c804b0f33 100644
--- a/vendor/rayon/src/vec.rs
+++ b/vendor/rayon/src/vec.rs
@@ -132,7 +132,7 @@ impl<'data, T: Send> IndexedParallelIterator for Drain<'data, T> {
self.range.len()
}
- fn with_producer<CB>(mut self, callback: CB) -> CB::Output
+ fn with_producer<CB>(self, callback: CB) -> CB::Output
where
CB: ProducerCallback<Self::Item>,
{
@@ -141,7 +141,7 @@ impl<'data, T: Send> IndexedParallelIterator for Drain<'data, T> {
self.vec.set_len(self.range.start);
// Create the producer as the exclusive "owner" of the slice.
- let producer = DrainProducer::from_vec(&mut self.vec, self.range.len());
+ let producer = DrainProducer::from_vec(self.vec, self.range.len());
// The producer will move or drop each item from the drained range.
callback.callback(producer)
@@ -151,22 +151,24 @@ impl<'data, T: Send> IndexedParallelIterator for Drain<'data, T> {
impl<'data, T: Send> Drop for Drain<'data, T> {
fn drop(&mut self) {
- if self.range.len() > 0 {
- let Range { start, end } = self.range;
- if self.vec.len() != start {
- // We must not have produced, so just call a normal drain to remove the items.
- assert_eq!(self.vec.len(), self.orig_len);
- self.vec.drain(start..end);
- } else if end < self.orig_len {
- // The producer was responsible for consuming the drained items.
- // Move the tail items to their new place, then set the length to include them.
- unsafe {
- let ptr = self.vec.as_mut_ptr().add(start);
- let tail_ptr = self.vec.as_ptr().add(end);
- let tail_len = self.orig_len - end;
- ptr::copy(tail_ptr, ptr, tail_len);
- self.vec.set_len(start + tail_len);
- }
+ let Range { start, end } = self.range;
+ if self.vec.len() == self.orig_len {
+ // We must not have produced, so just call a normal drain to remove the items.
+ self.vec.drain(start..end);
+ } else if start == end {
+ // Empty range, so just restore the length to its original state
+ unsafe {
+ self.vec.set_len(self.orig_len);
+ }
+ } else if end < self.orig_len {
+ // The producer was responsible for consuming the drained items.
+ // Move the tail items to their new place, then set the length to include them.
+ unsafe {
+ let ptr = self.vec.as_mut_ptr().add(start);
+ let tail_ptr = self.vec.as_ptr().add(end);
+ let tail_len = self.orig_len - end;
+ ptr::copy(tail_ptr, ptr, tail_len);
+ self.vec.set_len(start + tail_len);
}
}
}
@@ -181,7 +183,7 @@ pub(crate) struct DrainProducer<'data, T: Send> {
impl<T: Send> DrainProducer<'_, T> {
/// Creates a draining producer, which *moves* items from the slice.
///
- /// Unsafe bacause `!Copy` data must not be read after the borrow is released.
+ /// Unsafe because `!Copy` data must not be read after the borrow is released.
pub(crate) unsafe fn new(slice: &mut [T]) -> DrainProducer<'_, T> {
DrainProducer { slice }
}
@@ -207,7 +209,7 @@ impl<'data, T: 'data + Send> Producer for DrainProducer<'data, T> {
fn into_iter(mut self) -> Self::IntoIter {
// replace the slice so we don't drop it twice
- let slice = mem::replace(&mut self.slice, &mut []);
+ let slice = mem::take(&mut self.slice);
SliceDrain {
iter: slice.iter_mut(),
}
@@ -215,7 +217,7 @@ impl<'data, T: 'data + Send> Producer for DrainProducer<'data, T> {
fn split_at(mut self, index: usize) -> (Self, Self) {
// replace the slice so we don't drop it twice
- let slice = mem::replace(&mut self.slice, &mut []);
+ let slice = mem::take(&mut self.slice);
let (left, right) = slice.split_at_mut(index);
unsafe { (DrainProducer::new(left), DrainProducer::new(right)) }
}