Rust Lifetimes

playground.rs

//Lifetimes are generic parameters
//'a and 'b are lifetimes
//'static is a special lifetime for static memory
struct Person<'a> {
  pub id: i32,
  //Question: can we mutate parent.unwrap().id?
  pub parent: Option<&'a Person<'a>>
}

fn main() {
  let parent = Person {
    id: 1,
    parent: None
  };
  
  let child = Person {
    id: 2,
    parent: Some(&parent)
  };
  
  println!("Parent: {}", child.parent.unwrap().id);
}