| use crate::Stream; |
| |
| use core::future::Future; |
| use core::marker::PhantomPinned; |
| use core::pin::Pin; |
| use core::task::{Context, Poll}; |
| use pin_project_lite::pin_project; |
| |
| pin_project! { |
| /// Future for the [`any`](super::StreamExt::any) method. |
| #[derive(Debug)] |
| #[must_use = "futures do nothing unless you `.await` or poll them"] |
| pub struct AnyFuture<'a, St: ?Sized, F> { |
| stream: &'a mut St, |
| f: F, |
| // Make this future `!Unpin` for compatibility with async trait methods. |
| #[pin] |
| _pin: PhantomPinned, |
| } |
| } |
| |
| impl<'a, St: ?Sized, F> AnyFuture<'a, St, F> { |
| pub(super) fn new(stream: &'a mut St, f: F) -> Self { |
| Self { |
| stream, |
| f, |
| _pin: PhantomPinned, |
| } |
| } |
| } |
| |
| impl<St, F> Future for AnyFuture<'_, St, F> |
| where |
| St: ?Sized + Stream + Unpin, |
| F: FnMut(St::Item) -> bool, |
| { |
| type Output = bool; |
| |
| fn poll(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> { |
| let me = self.project(); |
| let next = futures_core::ready!(Pin::new(me.stream).poll_next(cx)); |
| |
| match next { |
| Some(v) => { |
| if (me.f)(v) { |
| Poll::Ready(true) |
| } else { |
| cx.waker().wake_by_ref(); |
| Poll::Pending |
| } |
| } |
| None => Poll::Ready(false), |
| } |
| } |
| } |