Function futures_lite::future::poll_once

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pub fn poll_once<T, F>(f: F) -> PollOnce<F>ⓘNotable traits for PollOnce<F>impl<T, F> Future for PollOnce<F> where
    F: Future<Output = T>,     type Output = Option<T>; where
    F: Future<Output = T>,

Expand description

Polls a future just once and returns an Option with the result.

Examples

use futures_lite::future;

assert_eq!(future::poll_once(future::pending::<()>()).await, None);
assert_eq!(future::poll_once(future::ready(42)).await, Some(42));