use core::pin::Pin;
use futures_core::future::Future;
use futures_core::task::{Context, Poll};
#[macro_export]
macro_rules! pending {
() => {
$crate::async_await::pending_once().await
}
}
#[doc(hidden)]
pub fn pending_once() -> PendingOnce {
PendingOnce { is_ready: false }
}
#[allow(missing_debug_implementations)]
#[doc(hidden)]
pub struct PendingOnce {
is_ready: bool,
}
impl Future for PendingOnce {
type Output = ();
fn poll(mut self: Pin<&mut Self>, _: &mut Context<'_>) -> Poll<Self::Output> {
if self.is_ready {
Poll::Ready(())
} else {
self.is_ready = true;
Poll::Pending
}
}
}