Method print_parent

10_smart_pointers/rust/bintree.rs:24–34

(&self)

    }

    fn print_parent(&self) {
        if let Some(parent) = &self.parent {
            if let Some(parent) = parent.upgrade() {
                println!("Parent: {:?}", parent.borrow().value);
            } else {
                println!("Parent: no more parent");
            }
        } else {
            println!("Parent: None");
        }
    }
}

fn main() {