Function callbag::interval

pub fn interval(
    period: Duration, 
    nursery: impl Nurse<()> + Timer + Send + Sync + Clone + 'static
) -> Source<usize>

A callbag listenable source that sends incremental numbers every x milliseconds.

See https://github.com/staltz/callbag-interval/blob/45d4fd8fd977bdf2babb27f67e740b0ff0b44e1e/index.js#L1-L10

Examples

use async_executors::TimerExt;
use async_nursery::Nursery;
use crossbeam_queue::SegQueue;
use std::{sync::Arc, time::Duration};

use callbag::{for_each, interval};

let (nursery, nursery_out) = Nursery::new(async_executors::AsyncStd);

let actual = Arc::new(SegQueue::new());

let source = interval(Duration::from_millis(1_000), nursery.clone());

for_each({
    let actual = Arc::clone(&actual);
    move |x| {
        println!("{}", x);
        actual.push(x);
    }
})(source);

let nursery_out = nursery.timeout(Duration::from_millis(4_500), nursery_out);
drop(nursery);
async_std::task::block_on(nursery_out);

assert_eq!(
    &{
        let mut v = vec![];
        for _i in 0..actual.len() {
            v.push(actual.pop().unwrap());
        }
        v
    }[..],
    [0, 1, 2, 3]
);