46 lines
1.5 KiB
Rust
46 lines
1.5 KiB
Rust
use std::{iter::FusedIterator, slice};
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use crate::{cfg, page, shard};
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/// An exclusive fused iterator over the items in a [`Slab`](crate::Slab).
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#[must_use = "iterators are lazy and do nothing unless consumed"]
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#[derive(Debug)]
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pub struct UniqueIter<'a, T, C: cfg::Config> {
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pub(super) shards: shard::IterMut<'a, Option<T>, C>,
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pub(super) pages: slice::Iter<'a, page::Shared<Option<T>, C>>,
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pub(super) slots: Option<page::Iter<'a, T, C>>,
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}
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impl<'a, T, C: cfg::Config> Iterator for UniqueIter<'a, T, C> {
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type Item = &'a T;
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fn next(&mut self) -> Option<Self::Item> {
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test_println!("UniqueIter::next");
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loop {
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test_println!("-> try next slot");
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if let Some(item) = self.slots.as_mut().and_then(|slots| slots.next()) {
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test_println!("-> found an item!");
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return Some(item);
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}
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test_println!("-> try next page");
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if let Some(page) = self.pages.next() {
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test_println!("-> found another page");
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self.slots = page.iter();
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continue;
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}
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test_println!("-> try next shard");
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if let Some(shard) = self.shards.next() {
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test_println!("-> found another shard");
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self.pages = shard.iter();
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} else {
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test_println!("-> all done!");
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return None;
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}
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}
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}
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}
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impl<T, C: cfg::Config> FusedIterator for UniqueIter<'_, T, C> {}
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