1use core::marker::PhantomData;
2use core::pin::Pin;
3use core::future::Future;
4
5use crate::stream::Stream;
6use crate::task::{Context, Poll};
7
8#[doc(hidden)]
9#[allow(missing_debug_implementations)]
10pub struct AllFuture<'a, S, F, T> {
11 pub(crate) stream: &'a mut S,
12 pub(crate) f: F,
13 pub(crate) _marker: PhantomData<T>,
14}
15
16impl<'a, S, F, T> AllFuture<'a, S, F, T> {
17 pub(crate) fn new(stream: &'a mut S, f: F) -> Self {
18 Self {
19 stream,
20 f,
21 _marker: PhantomData,
22 }
23 }
24}
25
26impl<S: Unpin, F, T> Unpin for AllFuture<'_, S, F, T> {}
27
28impl<S, F> Future for AllFuture<'_, S, F, S::Item>
29where
30 S: Stream + Unpin + Sized,
31 F: FnMut(S::Item) -> bool,
32{
33 type Output = bool;
34
35 fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> {
36 let next: Option<::Item> = futures_core::ready!(Pin::new(&mut *self.stream).poll_next(cx));
37
38 match next {
39 Some(v: ::Item) => {
40 let result: bool = (&mut self.f)(v);
41
42 if result {
43 // don't forget to wake this task again to pull the next item from stream
44 cx.waker().wake_by_ref();
45 Poll::Pending
46 } else {
47 Poll::Ready(false)
48 }
49 }
50 None => Poll::Ready(true),
51 }
52 }
53}
54