1 files changed, 39 insertions, 0 deletions
diff --git a/vendor/sharded-slab/src/iter.rs b/vendor/sharded-slab/src/iter.rs
new file mode 100644
index 000000000..54189aa57
--- /dev/null
+++ b/vendor/sharded-slab/src/iter.rs
@@ -0,0 +1,39 @@
+use crate::{page, shard};
+use std::slice;
+
+#[derive(Debug)]
+pub struct UniqueIter<'a, T, C: crate::cfg::Config> {
+    pub(super) shards: shard::IterMut<'a, Option<T>, C>,
+    pub(super) pages: slice::Iter<'a, page::Shared<Option<T>, C>>,
+    pub(super) slots: Option<page::Iter<'a, T, C>>,
+}
+
+impl<'a, T, C: crate::cfg::Config> Iterator for UniqueIter<'a, T, C> {
+    type Item = &'a T;
+    fn next(&mut self) -> Option<Self::Item> {
+        test_println!("UniqueIter::next");
+        loop {
+            test_println!("-> try next slot");
+            if let Some(item) = self.slots.as_mut().and_then(|slots| slots.next()) {
+                test_println!("-> found an item!");
+                return Some(item);
+            }
+
+            test_println!("-> try next page");
+            if let Some(page) = self.pages.next() {
+                test_println!("-> found another page");
+                self.slots = page.iter();
+                continue;
+            }
+
+            test_println!("-> try next shard");
+            if let Some(shard) = self.shards.next() {
+                test_println!("-> found another shard");
+                self.pages = shard.iter();
+            } else {
+                test_println!("-> all done!");
+                return None;
+            }
+        }
+    }
+}