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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;
}
}
}
}
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