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  1. #[derive(Debug)]
  2. enum Relationship {
  3.     PARENT,
  4.     CHILD,
  5. }
  6.  
  7. #[derive(Debug)]
  8. struct Person {
  9.     relationship: Relationship,
  10.     name: String,
  11.     age: u8,
  12. }
  13.  
  14. impl Person {
  15.     fn new(relationship: Relationship, name: &str, age: u8) -> Person {
  16.         Person {
  17.             relationship,
  18.             name: name.to_string(),
  19.             age,
  20.         }
  21.     }
  22. }
  23.  
  24. fn main() {
  25.     let mut persons = vec![
  26.         Person::new(Relationship::PARENT, "foo", 65),
  27.         Person::new(Relationship::CHILD, "foo jr", 25),
  28.         Person::new(Relationship::PARENT, "bar", 50),
  29.         Person::new(Relationship::CHILD, "bar jr", 20),
  30.     ];
  31.     for i in 0..(persons.len() - 1) {
  32.         let mut first = persons.get_mut(i).unwrap();
  33.         let mut second = persons.get_mut(i+1).unwrap();
  34.         first.age /= 5;
  35.         second.age += 1;
  36.     }
  37.     println!("{:?}", persons);
  38. }
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