1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54

use std::sync::mpsc::channel;
use std::thread;
use std::time::Duration;

use setting_tracker::Setting;

#[derive(Default, Debug)]
struct Settings {
    port: Setting<u16>,
}

fn main() {
    // Settings
    let (sender, receiver) = channel();
    let mut settings = Settings::default();
    settings.port.cb(move |old, new| {
        let old_and_new = (old.clone(), new.clone());
        sender.send(old_and_new).unwrap();
    });

    // Port subscriber
    thread::spawn(move || loop {
        let port = receiver.recv();
        if port.is_ok() {
            println!(
                "port changed: {:?} -> {:?}",
                port.unwrap().0,
                port.unwrap().1
            );
        }
    });

    // Port publisher
    let mut changing_port = 0u16;
    loop {
        changing_port = changing_port + 1;
        settings.port.set(changing_port);
        thread::sleep(Duration::from_millis(500));
    }
}

/*
Outputs:
    port changed: 0 -> 1
    port changed: 1 -> 2
    port changed: 2 -> 3
    port changed: 3 -> 4
    port changed: 4 -> 5
    port changed: 5 -> 6
    port changed: 6 -> 7
    port changed: 7 -> 8
    port changed: 8 -> 9
    ...
 */