pub fn lazy<F, R>(f: F) -> Lazy<F>ⓘNotable traits for Lazy<F>impl<F, R> Future for Lazy<F> where
F: FnOnce(&mut Context<'_>) -> R, type Output = R; where
F: FnOnce(&mut Context<'_>) -> R, Expand description
Creates a new future that allows delayed execution of a closure.
The provided closure is only run once the future is polled.
Examples
use futures::future;
let a = future::lazy(|_| 1);
assert_eq!(a.await, 1);
let b = future::lazy(|_| -> i32 {
panic!("oh no!")
});
drop(b); // closure is never run