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use core::mem;
use core::pin::Pin;
use futures_core::future::{FusedFuture, Future};
use futures_core::ready;
use futures_core::stream::{FusedStream, TryStream};
use futures_core::task::{Context, Poll};
use pin_project_lite::pin_project;
pin_project! {
/// Future for the [`try_collect`](super::TryStreamExt::try_collect) method.
#[derive(Debug)]
#[must_use = "futures do nothing unless you `.await` or poll them"]
pub struct TryCollect<St, C> {
#[pin]
stream: St,
items: C,
}
}
impl<St: TryStream, C: Default> TryCollect<St, C> {
pub(super) fn new(s: St) -> Self {
Self { stream: s, items: Default::default() }
}
}
impl<St, C> FusedFuture for TryCollect<St, C>
where
St: TryStream + FusedStream,
C: Default + Extend<St::Ok>,
{
fn is_terminated(&self) -> bool {
self.stream.is_terminated()
}
}
impl<St, C> Future for TryCollect<St, C>
where
St: TryStream,
C: Default + Extend<St::Ok>,
{
type Output = Result<C, St::Error>;
fn poll(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> {
let mut this = self.project();
Poll::Ready(Ok(loop {
match ready!(this.stream.as_mut().try_poll_next(cx)?) {
Some(x) => this.items.extend(Some(x)),
None => break mem::take(this.items),
}
}))
}
}