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use std::time::Duration;
use std::thread;
use std::sync::mpsc::{Receiver, Sender, channel, RecvTimeoutError};
pub struct Ticker<I: Iterator> {
src: I,
recv: Receiver<()>,
kill: Sender<()>,
}
impl<I: Iterator> Ticker<I> {
pub fn new(src: I, interval: Duration) -> Self {
let (send, recv) = channel::<()>();
let (kill, kill_recv) = channel::<()>();
thread::spawn(move || loop {
match kill_recv.recv_timeout(interval) {
Err(RecvTimeoutError::Timeout) => {
if let Err(_) = send.send(()) {
return;
}
}
_ => return,
}
});
Ticker { src, recv, kill }
}
}
impl<I: Iterator> Drop for Ticker<I> {
fn drop(&mut self) {
let _ = self.kill.send(());
}
}
impl<I: Iterator> IntoIterator for Ticker<I> {
type Item = I::Item;
type IntoIter = TickIter<I>;
fn into_iter(self) -> Self::IntoIter {
TickIter { ticker: self }
}
}
pub struct TickIter<I: Iterator> {
ticker: Ticker<I>,
}
impl<I: Iterator> Iterator for TickIter<I> {
type Item = I::Item;
fn next(&mut self) -> Option<Self::Item> {
let _ = self.ticker.recv.recv().expect("ticker channel to live");
self.ticker.src.next()
}
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn it_works() {
let vec: Vec<usize> = (0..10).collect();
let ticker = Ticker::new(vec.iter(), Duration::from_secs(1));
for i in ticker {
println!("{:?}", i);
}
}
}