meap/meap-code/ch4/ch4-check-sats-with-copy-trait.rs


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#[derive(Debug)]
struct CubeSat {
  id: u64,
}

#[derive(Debug)]
enum StatusMessage {
  Ok,
}

impl Copy for CubeSat { }

impl Copy for StatusMessage { }

impl Clone for CubeSat { // <1>
  fn clone(&self) -> Self {
    CubeSat { id: self.id } //<2>
  }
}

impl Clone for StatusMessage {
  fn clone(&self) -> Self {
    *self // <3>
  }
}

fn check_status(sat_id: CubeSat) -> StatusMessage {
  StatusMessage::Ok
}

fn main () {
  let sat_a = CubeSat { id: 0 };
  let sat_b = CubeSat { id: 1 };
  let sat_c = CubeSat { id: 2 };

  let a_status = check_status(sat_a);
  let b_status = check_status(sat_b);
  let c_status = check_status(sat_c);
  println!("a: {:?}, b: {:?}, c: {:?}", a_status, b_status, c_status);

  // "waiting" ...
  let a_status = check_status(sat_a);
  let b_status = check_status(sat_b);
  let c_status = check_status(sat_c);
  println!("a: {:?}, b: {:?}, c: {:?}", a_status, b_status, c_status);
}