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use core::pin::Pin;
use core::future::Future;

use crate::stream::DoubleEndedStream;
use crate::task::{Context, Poll};

#[doc(hidden)]
#[allow(missing_debug_implementations)]
pub struct NextBackFuture<'a, T: Unpin + ?Sized> {
    pub(crate) stream: &'a mut T,
}

impl<T: DoubleEndedStream + Unpin + ?Sized> Future for NextBackFuture<'_, T> {
    type Output = Option<T::Item>;

    fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> {
        Pin::new(&mut *self.stream).poll_next_back(cx)
    }
}