blob: 7f467c062fbf7aa5744ba13b7f2f0617bb36f8b1 [file] [log] [blame]
use super::FuturesUnordered;
use super::task::Task;
use std::marker::{PhantomData, Unpin};
use std::pin::Pin;
#[derive(Debug)]
/// Mutable iterator over all futures in the unordered set.
pub struct IterPinMut<'a, Fut: 'a> {
pub(super) task: *const Task<Fut>,
pub(super) len: usize,
pub(super) _marker: PhantomData<&'a mut FuturesUnordered<Fut>>
}
#[derive(Debug)]
/// Mutable iterator over all futures in the unordered set.
pub struct IterMut<'a, Fut: Unpin + 'a> (pub(super) IterPinMut<'a, Fut>);
impl<'a, Fut> Iterator for IterPinMut<'a, Fut> {
type Item = Pin<&'a mut Fut>;
fn next(&mut self) -> Option<Pin<&'a mut Fut>> {
if self.task.is_null() {
return None;
}
unsafe {
let future = (*(*self.task).future.get()).as_mut().unwrap();
let next = *(*self.task).next_all.get();
self.task = next;
self.len -= 1;
Some(Pin::new_unchecked(future))
}
}
fn size_hint(&self) -> (usize, Option<usize>) {
(self.len, Some(self.len))
}
}
impl<Fut> ExactSizeIterator for IterPinMut<'_, Fut> {}
impl<'a, Fut: Unpin> Iterator for IterMut<'a, Fut> {
type Item = &'a mut Fut;
fn next(&mut self) -> Option<&'a mut Fut> {
self.0.next().map(Pin::get_mut)
}
fn size_hint(&self) -> (usize, Option<usize>) {
self.0.size_hint()
}
}
impl<Fut: Unpin> ExactSizeIterator for IterMut<'_, Fut> {}