actix 0.5.3

Actor framework for Rust
Documentation 
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use std::time::Duration;
use futures::{Async, Future, Poll};
use tokio_core::reactor::Timeout as TokioTimeout;

use fut::ActorFuture;
use actor::Actor;
use arbiter::Arbiter;


/// Future for the `timeout` combinator, interrupts computations if it takes more
/// than `timeout`.
///
/// This is created by the `ActorFuture::timeout()` method.
#[derive(Debug)]
#[must_use = "futures do nothing unless polled"]
pub struct Timeout<F> where F: ActorFuture
{
    fut: F,
    err: Option<F::Error>,
    timeout: TokioTimeout,
}

pub fn new<F>(future: F, timeout: Duration, err: F::Error) -> Timeout<F> where F: ActorFuture
{
    Timeout {
        fut: future,
        err: Some(err),
        timeout: TokioTimeout::new(timeout, Arbiter::handle()).unwrap(),
    }
}

impl<F> ActorFuture for Timeout<F> where F: ActorFuture
{
    type Item = F::Item;
    type Error = F::Error;
    type Actor = F::Actor;

    fn poll(&mut self,
            act: &mut F::Actor,
            ctx: &mut <F::Actor as Actor>::Context) -> Poll<F::Item, F::Error>
    {
        // check timeout
        match self.timeout.poll() {
            Ok(Async::Ready(())) => return Err(self.err.take().unwrap()),
            Ok(Async::NotReady) => (),
            Err(_) => unreachable!(),
        }

        self.fut.poll(act, ctx)
    }
}