Rust
Futuros y Async IO

Introducción

Creando un futuro con función oneshot

Hay algunas implementaciones generales de rasgos Future en la caja de futuros . Uno de ellos se implementa en futures::sync::oneshot module y está disponible a través de futures::oneshot function:

extern crate futures;

use std::thread;
use futures::Future;

fn expensive_computation() -> u32 {
    // ...
    200
}

fn main() {
    // The oneshot function returns a tuple of a Sender and a Receiver.
    let (tx, rx) = futures::oneshot();

    thread::spawn(move || {
        // The complete method resolves a values.
        tx.complete(expensive_computation());
    });

    // The map method applies a function to a value, when it is resolved.
    let rx = rx.map(|x| {
        println!("{}", x);
    });

    // The wait method blocks current thread until the value is resolved.
    rx.wait().unwrap();
}