pub macro ready($e:expr) { ... }
Expand description
Extracts the successful type of a Poll<T>
.
This macro bakes in propagation of Pending
signals by returning early.
§Examples
use std::task::{ready, Context, Poll};
use std::future::{self, Future};
use std::pin::Pin;
pub fn do_poll(cx: &mut Context<'_>) -> Poll<()> {
let mut fut = future::ready(42);
let fut = Pin::new(&mut fut);
let num = ready!(fut.poll(cx));
// ... use num
Poll::Ready(())
}
RunThe ready!
call expands to:
let num = match fut.poll(cx) {
Poll::Ready(t) => t,
Poll::Pending => return Poll::Pending,
};
Run