sharded_slab/
iter.rs

1use std::{iter::FusedIterator, slice};
2
3use crate::{cfg, page, shard};
4
5/// An exclusive fused iterator over the items in a [`Slab`](crate::Slab).
6#[must_use = "iterators are lazy and do nothing unless consumed"]
7#[derive(Debug)]
8pub struct UniqueIter<'a, T, C: cfg::Config> {
9    pub(super) shards: shard::IterMut<'a, Option<T>, C>,
10    pub(super) pages: slice::Iter<'a, page::Shared<Option<T>, C>>,
11    pub(super) slots: Option<page::Iter<'a, T, C>>,
12}
13
14impl<'a, T, C: cfg::Config> Iterator for UniqueIter<'a, T, C> {
15    type Item = &'a T;
16
17    fn next(&mut self) -> Option<Self::Item> {
18        test_println!("UniqueIter::next");
19        loop {
20            test_println!("-> try next slot");
21            if let Some(item) = self.slots.as_mut().and_then(|slots| slots.next()) {
22                test_println!("-> found an item!");
23                return Some(item);
24            }
25
26            test_println!("-> try next page");
27            if let Some(page) = self.pages.next() {
28                test_println!("-> found another page");
29                self.slots = page.iter();
30                continue;
31            }
32
33            test_println!("-> try next shard");
34            if let Some(shard) = self.shards.next() {
35                test_println!("-> found another shard");
36                self.pages = shard.iter();
37            } else {
38                test_println!("-> all done!");
39                return None;
40            }
41        }
42    }
43}
44
45impl<T, C: cfg::Config> FusedIterator for UniqueIter<'_, T, C> {}
sharded_slab/iter.rs

sharded_slab/
iter.rs
