1use crate::{page, shard};
2use std::slice;
3
4#[derive(Debug)]
5pub struct UniqueIter<'a, T, C: crate::cfg::Config> {
6 pub(super) shards: shard::IterMut<'a, Option<T>, C>,
7 pub(super) pages: slice::Iter<'a, page::Shared<Option<T>, C>>,
8 pub(super) slots: Option<page::Iter<'a, T, C>>,
9}
10
11impl<'a, T, C: crate::cfg::Config> Iterator for UniqueIter<'a, T, C> {
12 type Item = &'a T;
13 fn next(&mut self) -> Option<Self::Item> {
14 test_println!("UniqueIter::next");
15 loop {
16 test_println!("-> try next slot");
17 if let Some(item) = self.slots.as_mut().and_then(|slots| slots.next()) {
18 test_println!("-> found an item!");
19 return Some(item);
20 }
21
22 test_println!("-> try next page");
23 if let Some(page) = self.pages.next() {
24 test_println!("-> found another page");
25 self.slots = page.iter();
26 continue;
27 }
28
29 test_println!("-> try next shard");
30 if let Some(shard) = self.shards.next() {
31 test_println!("-> found another shard");
32 self.pages = shard.iter();
33 } else {
34 test_println!("-> all done!");
35 return None;
36 }
37 }
38 }
39}
40