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-rw-r--r--third_party/rust/rayon/src/collections/binary_heap.rs120
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diff --git a/third_party/rust/rayon/src/collections/binary_heap.rs b/third_party/rust/rayon/src/collections/binary_heap.rs
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+//! This module contains the parallel iterator types for heaps
+//! (`BinaryHeap<T>`). You will rarely need to interact with it directly
+//! unless you have need to name one of the iterator types.
+
+use std::collections::BinaryHeap;
+
+use crate::iter::plumbing::*;
+use crate::iter::*;
+
+use crate::vec;
+
+/// Parallel iterator over a binary heap
+#[derive(Debug, Clone)]
+pub struct IntoIter<T: Ord + Send> {
+ inner: vec::IntoIter<T>,
+}
+
+impl<T: Ord + Send> IntoParallelIterator for BinaryHeap<T> {
+ type Item = T;
+ type Iter = IntoIter<T>;
+
+ fn into_par_iter(self) -> Self::Iter {
+ IntoIter {
+ inner: Vec::from(self).into_par_iter(),
+ }
+ }
+}
+
+delegate_indexed_iterator! {
+ IntoIter<T> => T,
+ impl<T: Ord + Send>
+}
+
+/// Parallel iterator over an immutable reference to a binary heap
+#[derive(Debug)]
+pub struct Iter<'a, T: Ord + Sync> {
+ inner: vec::IntoIter<&'a T>,
+}
+
+impl<'a, T: Ord + Sync> Clone for Iter<'a, T> {
+ fn clone(&self) -> Self {
+ Iter {
+ inner: self.inner.clone(),
+ }
+ }
+}
+
+into_par_vec! {
+ &'a BinaryHeap<T> => Iter<'a, T>,
+ impl<'a, T: Ord + Sync>
+}
+
+delegate_indexed_iterator! {
+ Iter<'a, T> => &'a T,
+ impl<'a, T: Ord + Sync + 'a>
+}
+
+// `BinaryHeap` doesn't have a mutable `Iterator`
+
+/// Draining parallel iterator that moves out of a binary heap,
+/// but keeps the total capacity.
+#[derive(Debug)]
+pub struct Drain<'a, T: Ord + Send> {
+ heap: &'a mut BinaryHeap<T>,
+}
+
+impl<'a, T: Ord + Send> ParallelDrainFull for &'a mut BinaryHeap<T> {
+ type Iter = Drain<'a, T>;
+ type Item = T;
+
+ fn par_drain(self) -> Self::Iter {
+ Drain { heap: self }
+ }
+}
+
+impl<'a, T: Ord + Send> ParallelIterator for Drain<'a, T> {
+ type Item = T;
+
+ fn drive_unindexed<C>(self, consumer: C) -> C::Result
+ where
+ C: UnindexedConsumer<Self::Item>,
+ {
+ bridge(self, consumer)
+ }
+
+ fn opt_len(&self) -> Option<usize> {
+ Some(self.len())
+ }
+}
+
+impl<'a, T: Ord + Send> IndexedParallelIterator for Drain<'a, T> {
+ fn drive<C>(self, consumer: C) -> C::Result
+ where
+ C: Consumer<Self::Item>,
+ {
+ bridge(self, consumer)
+ }
+
+ fn len(&self) -> usize {
+ self.heap.len()
+ }
+
+ fn with_producer<CB>(self, callback: CB) -> CB::Output
+ where
+ CB: ProducerCallback<Self::Item>,
+ {
+ super::DrainGuard::new(self.heap)
+ .par_drain(..)
+ .with_producer(callback)
+ }
+}
+
+impl<'a, T: Ord + Send> Drop for Drain<'a, T> {
+ fn drop(&mut self) {
+ if !self.heap.is_empty() {
+ // We must not have produced, so just call a normal drain to remove the items.
+ self.heap.drain();
+ }
+ }
+}