use futures::executor::block_on; | |
use futures::future::{self, FutureExt, BoxFuture}; | |
use std::sync::mpsc; | |
use std::thread; | |
#[test] | |
fn lots() { | |
fn do_it(input: (i32, i32)) -> BoxFuture<'static, i32> { | |
let (n, x) = input; | |
if n == 0 { | |
future::ready(x).boxed() | |
} else { | |
future::ready((n - 1, x + n)).then(do_it).boxed() | |
} | |
} | |
let (tx, rx) = mpsc::channel(); | |
thread::spawn(|| { | |
block_on(do_it((1_000, 0)).map(move |x| tx.send(x).unwrap())) | |
}); | |
assert_eq!(500_500, rx.recv().unwrap()); | |
} |