1 use crate::{page, shard};
2 use std::slice;
3 
4 #[derive(Debug)]
5 pub 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 
11 impl<'a, T, C: crate::cfg::Config> Iterator for UniqueIter<'a, T, C> {
12     type Item = &'a T;
next(&mut self) -> Option<Self::Item>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