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use core::{
    future::Future,
    pin::Pin,
    task::{Context, Poll},
};

#[derive(Debug)]
#[must_use]
pub struct DoYield {
    done: bool,
}

impl Future for DoYield {
    type Output = ();

    fn poll(mut self: Pin<&mut Self>, cx: &mut Context) -> Poll<()> {
        if self.done {
            Poll::Ready(())
        } else {
            self.done = true;
            cx.waker().wake_by_ref();
            Poll::Pending
        }
    }
}

pub fn do_yield() -> DoYield {
    DoYield { done: false }
}