Shared read-only variable with string value

---

• The string must be cloned for this to work.

examples/threads/shared-read-only-variable-string/src/main.rs

use std::time::Duration;

fn main() {
    let answer = String::from("Hello World!");

    println!("Before:     {answer} {:p} {:?}", &answer, answer.as_ptr());
    let mut handles = vec![];
    for _ in 1..=3 {
        let answer = answer.clone();
        handles.push(std::thread::spawn(move || {
            println!(
                "{:?} {} {:p} {:?}",
                std::thread::current().id(),
                answer,
                &answer,
                answer.as_ptr()
            );
            std::thread::sleep(Duration::from_millis(10));
        }));
    }
    println!("Started:    {answer} {:p} {:?}", &answer, answer.as_ptr());
    for handle in handles {
        handle.join().unwrap();
    }
    println!("After:      {answer} {:p} {:?}", &answer, answer.as_ptr());
}

Before:     Hello World! 0x7fffa8e341c8 0x5c8f8538db80
Started:    Hello World! 0x7fffa8e341c8 0x5c8f8538db80
ThreadId(2) Hello World! 0x7d60e73ffb70 0x5c8f8538dba0
ThreadId(4) Hello World! 0x7d60e6bffb70 0x5c8f8538e090
ThreadId(3) Hello World! 0x7d60e6fffb70 0x5c8f8538de50
After:      Hello World! 0x7fffa8e341c8 0x5c8f8538db80