Implementing Unsafe Traits

Exercises

Unsafe traits

// Fix the code to make it compile. Do not modify trait definition.

unsafe trait Length {
    fn length(&self) -> usize;
}

impl Length for String {
    fn length(&self) -> usize {
        self.len()
    }
}

impl Length for i32 {
    fn length(&self) -> usize {
        match self {
            -9..=9 => 1,
            _ => 1 + (self / 10).length(),
        }
    }
}

fn main() {
    let my_str = "Unsafe Traits".to_owned();
    let my_num = 12323;
    println!("\"{my_str}\" takes {} bytes", my_str.length());
    println!("{my_num} has {} digits", my_num.length());
}

unsafe trait Length {
  fn length(&self) -> usize;
}

unsafe impl Length for String {
  fn length(&self) -> usize {
      self.len()
  }
}

unsafe impl Length for i32 {
  fn length(&self) -> usize {
      match self {
          -9..=9 => 1,
          _ => 1 + (self / 10).length(),
      }
  }
}

fn main() {
  let my_str = "Unsafe Traits".to_owned();
  let my_num = 12323;
  println!("\"{my_str}\" takes {} bytes", my_str.length());
  println!("{my_num} has {} digits", my_num.length());
}