File: sendfn-spawn-with-fn-arg.rs

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rustc 1.88.0%2Bdfsg1-1
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//@ run-pass
//@ needs-threads

use std::thread;

pub fn main() {
    test05();
}

fn test05_start<F: FnOnce(isize)>(f: F) {
    f(22);
}

fn test05() {
    let three: Box<_> = Box::new(3);
    let fn_to_send = move |n: isize| {
        println!("{}", *three + n); // will copy x into the closure
        assert_eq!(*three, 3);
    };
    thread::spawn(move || {
        test05_start(fn_to_send);
    })
    .join()
    .ok()
    .unwrap();
}