Function futures::future::poll_fn

pub fn poll_fn<T, E, F>(f: F) -> PollFn<F> where
    F: FnMut(&mut Context) -> Result<Async<T>, E>, 

Creates a new future wrapping around a function returning Poll.

Polling the returned future delegates to the wrapped function.

Examples

use futures::prelude::*;
use futures::future::poll_fn;
use futures::never::Never;
use futures::task;

fn read_line(cx: &mut task::Context) -> Poll<String, Never> {
    Ok(Async::Ready("Hello, World!".into()))
}

let read_future = poll_fn(read_line);