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Sep 17th, 2019
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  1. struct List {
  2. value: i32,
  3. next: Option<List>,
  4. }
  5.  
  6. fn print_list(list: &Option<&List>) {
  7. match list {
  8. None => {}
  9. Some(list) => {
  10. println!("{}", list.value);
  11. print_list(list.next);
  12. }
  13. }
  14. }
  15.  
  16. fn build_and_print_list(iter: &std::slice::Iter<i32>, tail: Option<&List>) {
  17. match iter.next() {
  18. None => print_list(&tail),
  19. Some(value) => {
  20. build_and_print_list(
  21. iter,
  22. Some(List {
  23. value: value,
  24. next: tail,
  25. }),
  26. );
  27. }
  28. }
  29. }
  30.  
  31. fn main() {
  32. let values = [5, 23, 0, 17, 6, 7, 10, 3, 1];
  33. let iter = values.iter();
  34. build_and_print_list(&iter, None);
  35. }
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