59 lines
1.5 KiB
Rust
59 lines
1.5 KiB
Rust
use crate::Stream;
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use core::future::Future;
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use core::marker::PhantomPinned;
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use core::pin::Pin;
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use core::task::{ready, Context, Poll};
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use pin_project_lite::pin_project;
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pin_project! {
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/// Future for the [`all`](super::StreamExt::all) method.
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#[derive(Debug)]
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#[must_use = "futures do nothing unless you `.await` or poll them"]
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pub struct AllFuture<'a, St: ?Sized, F> {
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stream: &'a mut St,
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f: F,
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// Make this future `!Unpin` for compatibility with async trait methods.
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#[pin]
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_pin: PhantomPinned,
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}
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}
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impl<'a, St: ?Sized, F> AllFuture<'a, St, F> {
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pub(super) fn new(stream: &'a mut St, f: F) -> Self {
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Self {
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stream,
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f,
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_pin: PhantomPinned,
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}
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}
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}
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impl<St, F> Future for AllFuture<'_, St, F>
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where
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St: ?Sized + Stream + Unpin,
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F: FnMut(St::Item) -> bool,
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{
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type Output = bool;
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fn poll(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> {
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let me = self.project();
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let mut stream = Pin::new(me.stream);
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// Take a maximum of 32 items from the stream before yielding.
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for _ in 0..32 {
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match ready!(stream.as_mut().poll_next(cx)) {
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Some(v) => {
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if !(me.f)(v) {
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return Poll::Ready(false);
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}
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}
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None => return Poll::Ready(true),
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}
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}
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cx.waker().wake_by_ref();
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Poll::Pending
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}
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}
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