capture-it 0.4.3

use std::sync::atomic::Ordering::Relaxed;
use std::sync::{atomic::AtomicUsize, Arc};
use std::time::Duration;

use capture_it::capture;

fn main() {
    let va = Arc::new(AtomicUsize::new(0));

    // This expr makes a closure that captures `va` by copy
    std::thread::spawn(capture!([va], move || {
        va.fetch_add(1, Relaxed);
    }));

    // We can create new variable with expression, same as c++.
    std::thread::spawn(capture!([va_other = va.clone()], move || {
        va_other.fetch_add(1, Relaxed);
    }));

    // Asterisk-prefixed variable will be declared as mutable.
    std::thread::spawn(capture!([*va], move || {
        va = Arc::new(AtomicUsize::new(0));
        va.fetch_add(1, Relaxed);
    }));

    // This expr makes a closure that captures `va` by reference
    while capture!([&va], move || -> bool {
        if va.load(Relaxed) == 2 {
            // the last thread does not increment same reference ...
            false
        } else {
            std::thread::sleep(Duration::from_millis(10));
            true
        }
    })() {}

    println!("va = {}", va.load(Relaxed));
    assert_eq!(va.load(Relaxed), 2);

    // This expr makes a closure that captures `va` by move
    let _ = capture!([], move || va);
    let _ = capture!([], move || <Vec<u8>>::new());

    #[allow(unused_unsafe)]
    let _ = capture!([], move || unsafe { <Vec<u8>>::new() });

    #[derive(Default)]
    struct Foo {
        va: usize,
    }

    assert!(capture!([], move || Foo { va: 5 })().va == 5);
    assert!(capture!([va = 5], move || Foo { va })().va == 5);
    assert!(capture!([], move || Foo::default())().va == 0);

    // Therefore, we can't access `va` anymore
    // let _ = capture!([], || { va }); // this line will cause compile error!
}