提问

当在派生线程中创建Box时，Box的地址非常高，这是典型的堆栈地址，但Box应该指向堆。地址为什么这么高？

代码

use std::thread;
use std::time::Duration;

fn main() {
    let x = 42;

    println!("x (main thread, stack):     {:p}", &x);
    println!("Box (main thread, heap):    {:p}", Box::new(x));

    thread::spawn(|| {
        let x = 42;

        println!("x (spawned thread, stack):  {:p}", &x);
        println!("Box (spawned thread, heap): {:p}", Box::new(x));
    });

    thread::sleep(Duration::from_secs(1)); // Give the spawned thread some time
}

字符串

输出

x (main thread, stack):     0x7fff1d0cb414
Box (main thread, heap):    0x55e608db8ae0
x (spawned thread, stack):  0x7f94ae707b54
Box (spawned thread, heap): 0x7f94a8000b80

型

环境

• Linux操作系统
• 货物1.69.0
• 下载rustc 1.69.0