// Returns a HashMap from ifindex (a `u32`) to an `Interface` struct.
let interfaces = netwatcher::list_interfaces().unwrap();
for i in interfaces.values() {
    println!("interface {} has {} IPs", i.name, i.ips.len());
}

let handle = netwatcher::watch_interfaces_with_callback(|update| {
    // All watch types will fire immediately with initial interface state
    println!("Is initial update: {}", update.is_initial);
    println!("Current interface map: {:#?}", update.interfaces);

    // Interfaces may appear or disappear entirely.
    for ifindex in &update.diff.added {
        println!("ifindex {} was added", ifindex);
    }
    for ifindex in &update.diff.removed {
        println!("ifindex {} was removed", ifindex);
    }

    // Existing interfaces may gain or lose IPs.
    for (ifindex, diff) in &update.diff.modified {
        let interface = &update.interfaces[ifindex];
        for addr in &diff.addrs_added {
            println!("{} gained {}/{}", interface.name, addr.ip, addr.prefix_len);
        }
        for addr in &diff.addrs_removed {
            println!("{} lost {}/{}", interface.name, addr.ip, addr.prefix_len);
        }
    }
})
.unwrap();

// Keep `handle` alive as long as you want callbacks.
// ...
drop(handle);

let mut watch = netwatcher::watch_interfaces_blocking().unwrap();

loop {
    let update = watch.changed();
    println!("Initial update: {}", update.is_initial);
    println!("Current interface map: {:#?}", update.interfaces);
}

use netwatcher::async_adapter::Tokio;

let runtime = tokio::runtime::Builder::new_current_thread()
    .enable_all()
    .build()
    .unwrap();

runtime.block_on(async {
    let mut watch = netwatcher::watch_interfaces_async::<Tokio>().unwrap();

    loop {
        let update = watch.changed().await;
        println!("Initial update: {}", update.is_initial);
        println!("Current interface map: {:#?}", update.interfaces);
    }
});