Function futures_lite::future::poll_fn

source · [−]

pub fn poll_fn<T, F>(f: F) -> PollFn<F>ⓘNotable traits for PollFn<F>impl<T, F> Future for PollFn<F> where
    F: FnMut(&mut Context<'_>) -> Poll<T>,     type Output = T; where
    F: FnMut(&mut Context<'_>) -> Poll<T>,

Expand description

Creates a future from a function returning Poll.

Examples

use futures_lite::future;
use std::task::{Context, Poll};

fn f(_: &mut Context<'_>) -> Poll<i32> {
    Poll::Ready(7)
}

assert_eq!(future::poll_fn(f).await, 7);