use super::assert_future;
use core::marker;
use core::pin::Pin;
use futures_core::future::{FusedFuture, Future};
use futures_core::task::{Context, Poll};
#[derive(Debug)]
#[must_use = "futures do nothing unless you `.await` or poll them"]
pub struct Pending<T> {
_data: marker::PhantomData<T>,
}
impl<T> FusedFuture for Pending<T> {
fn is_terminated(&self) -> bool {
true
}
}
#[cfg_attr(docsrs, doc(alias = "never"))]
pub fn pending<T>() -> Pending<T> {
assert_future::<T, _>(Pending { _data: marker::PhantomData })
}
impl<T> Future for Pending<T> {
type Output = T;
fn poll(self: Pin<&mut Self>, _: &mut Context<'_>) -> Poll<T> {
Poll::Pending
}
}
impl<T> Unpin for Pending<T> {}
impl<T> Clone for Pending<T> {
fn clone(&self) -> Self {
pending()
}
}