Trait tokio::prelude::FutureExt [−] [src]

pub trait FutureExt: Future {
    fn deadline(self, deadline: Instant) -> Deadline<Self>
    where
        Self: Sized,
    { ... }
}

An extension trait for Future that provides a variety of convenient combinator functions.

Currently, there only is a deadline function, but this will increase over time.

Users are not expected to implement this trait. All types that implement Future already implement FutureExt.

This trait can be imported directly or via the Tokio prelude: use tokio::prelude::*.

Provided Methods

Creates a new future which allows self until deadline.

This combinator creates a new future which wraps the receiving future with a deadline. The returned future is allowed to execute until it completes or deadline is reached, whicheever happens first.

If the future completes before deadline then the future will resolve with that item. Otherwise the future will resolve to an error once deadline is reached.

Examples

use tokio::prelude::*;
use std::time::{Duration, Instant};

let future = long_future()
    .deadline(Instant::now() + Duration::from_secs(1))
    .map_err(|e| println!("error = {:?}", e));

tokio::run(future);

Implementors