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use crate::lib::future::Future;
use crate::lib::marker::Unpin;
use crate::lib::pin::Pin;
use crate::lib::task::{Context, Poll};
// Replace usage of this with std::future::poll_fn once it stabilizes
pub struct PollFn<F> {
f: F,
}
impl<F> Unpin for PollFn<F> {}
pub fn poll_fn<T, F>(f: F) -> PollFn<F>
where
F: FnMut(&mut Context<'_>) -> Poll<T>,
{
PollFn { f }
}
impl<T, F> Future for PollFn<F>
where
F: FnMut(&mut Context<'_>) -> Poll<T>,
{
type Output = T;
fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<T> {
(&mut self.f)(cx)
}
}
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