Joining a thread in a method that takes `&mut self` (like drop) results in “cannot move out of borrowed content”

Question

I want to create a thread inside of the new method and stop it after the struct is destroyed:

use std::thread;

struct Foo {
    handle: thread:         


        

Answer 1

If you don't mind unsafe code, then here's something you could do (please look at Matthieus answer why this can be a bad idea).

struct Foo {
    handle: ManuallyDrop>,
}

impl Drop for Foo {
    fn drop(&mut self) {
        unsafe {
            let _ = ManuallyDrop::take(&mut self.handle).join();
        }
    }
}