练习：电梯事件

我们将创建一个数据结构来表示电梯控制系统中的事件。您可以自行定义用于构造各种事件的类型和函数。使用 #[derive(Debug)] 以允许通过 {:?} 设置类型格式。

This exercise only requires creating and populating data structures so that main runs without errors. The next part of the course will cover getting data out of these structures.

  1. #[derive(Debug)]
  2. /// An event in the elevator system that the controller must react to.
  3. enum Event {
  4.     // TODO: add required variants
  5. }
  7. /// A direction of travel.
  8. #[derive(Debug)]
  9. enum Direction {
  10.     Up,
  11.     Down,
  12. }
  14. /// The car has arrived on the given floor.
  15. fn car_arrived(floor: i32) -> Event {
  16.     todo!()
  17. }
  19. /// The car doors have opened.
  20. fn car_door_opened() -> Event {
  21.     todo!()
  22. }
  24. /// The car doors have closed.
  25. fn car_door_closed() -> Event {
  26.     todo!()
  27. }
  29. /// A directional button was pressed in an elevator lobby on the given floor.
  30. fn lobby_call_button_pressed(floor: i32, dir: Direction) -> Event {
  31.     todo!()
  32. }
  34. /// A floor button was pressed in the elevator car.
  35. fn car_floor_button_pressed(floor: i32) -> Event {
  36.     todo!()
  37. }
  39. fn main() {
  40.     println!(
  41.         "A ground floor passenger has pressed the up button: {:?}",
  42.         lobby_call_button_pressed(0, Direction::Up)
  43.     );
  44.     println!("The car has arrived on the ground floor: {:?}", car_arrived(0));
  45.     println!("The car door opened: {:?}", car_door_opened());
  46.     println!(
  47.         "A passenger has pressed the 3rd floor button: {:?}",
  48.         car_floor_button_pressed(3)
  49.     );
  50.     println!("The car door closed: {:?}", car_door_closed());
  51.     println!("The car has arrived on the 3rd floor: {:?}", car_arrived(3));
  52. }