Sha256: ff218aea3d2d2456c8163926ea0c357b2752e92578e5fd4bec6b789fe1246556
Contents?: true
Size: 1.33 KB
Versions: 27
Compression:
Stored size: 1.33 KB
Contents
use core::fmt;
use core::pin::Pin;
use futures_core::future::{FusedFuture, Future};
use futures_core::ready;
use futures_core::stream::{FusedStream, Stream};
use futures_core::task::{Context, Poll};
use pin_project_lite::pin_project;
pin_project! {
/// Future for the [`count`](super::StreamExt::count) method.
#[must_use = "futures do nothing unless you `.await` or poll them"]
pub struct Count<St> {
#[pin]
stream: St,
count: usize
}
}
impl<St> fmt::Debug for Count<St>
where
St: fmt::Debug,
{
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
f.debug_struct("Count").field("stream", &self.stream).field("count", &self.count).finish()
}
}
impl<St: Stream> Count<St> {
pub(super) fn new(stream: St) -> Self {
Self { stream, count: 0 }
}
}
impl<St: FusedStream> FusedFuture for Count<St> {
fn is_terminated(&self) -> bool {
self.stream.is_terminated()
}
}
impl<St: Stream> Future for Count<St> {
type Output = usize;
fn poll(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> {
let mut this = self.project();
Poll::Ready(loop {
match ready!(this.stream.as_mut().poll_next(cx)) {
Some(_) => *this.count += 1,
None => break *this.count,
}
})
}
}
Version data entries
27 entries across 27 versions & 1 rubygems