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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-19 00:47:55 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-19 00:47:55 +0000 |
commit | 26a029d407be480d791972afb5975cf62c9360a6 (patch) | |
tree | f435a8308119effd964b339f76abb83a57c29483 /third_party/rust/tokio-stream/src/stream_ext/all.rs | |
parent | Initial commit. (diff) | |
download | firefox-26a029d407be480d791972afb5975cf62c9360a6.tar.xz firefox-26a029d407be480d791972afb5975cf62c9360a6.zip |
Adding upstream version 124.0.1.upstream/124.0.1
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'third_party/rust/tokio-stream/src/stream_ext/all.rs')
-rw-r--r-- | third_party/rust/tokio-stream/src/stream_ext/all.rs | 58 |
1 files changed, 58 insertions, 0 deletions
diff --git a/third_party/rust/tokio-stream/src/stream_ext/all.rs b/third_party/rust/tokio-stream/src/stream_ext/all.rs new file mode 100644 index 0000000000..b4dbc1e97c --- /dev/null +++ b/third_party/rust/tokio-stream/src/stream_ext/all.rs @@ -0,0 +1,58 @@ +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 [`all`](super::StreamExt::all) method. + #[derive(Debug)] + #[must_use = "futures do nothing unless you `.await` or poll them"] + pub struct AllFuture<'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> AllFuture<'a, St, F> { + pub(super) fn new(stream: &'a mut St, f: F) -> Self { + Self { + stream, + f, + _pin: PhantomPinned, + } + } +} + +impl<St, F> Future for AllFuture<'_, 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 mut stream = Pin::new(me.stream); + + // Take a maximum of 32 items from the stream before yielding. + for _ in 0..32 { + match futures_core::ready!(stream.as_mut().poll_next(cx)) { + Some(v) => { + if !(me.f)(v) { + return Poll::Ready(false); + } + } + None => return Poll::Ready(true), + } + } + + cx.waker().wake_by_ref(); + Poll::Pending + } +} |