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  1. // Dummy for what's already in events system
  2. struct Event {}
  3.  
  4. impl Event {
  5.     fn event() {
  6.         println!("Event")
  7.     }
  8.    
  9.     fn anti_event() {
  10.         println!("Anti-Event")
  11.     }
  12. }
  13.  
  14. // Suggested new struct in events infra
  15. struct Gauge {}
  16.  
  17. impl Gauge {
  18.     fn new() -> Gauge {
  19.         Event::event();
  20.         Gauge {}
  21.     }
  22. }
  23.  
  24. impl Drop for Gauge {
  25.     fn drop(&mut self) {
  26.         Event::anti_event();
  27.     }
  28. }
  29.  
  30. impl Clone for Gauge {
  31.     fn clone(&self) -> Gauge {
  32.         Event::event();
  33.         Gauge {}        
  34.     }
  35. }
  36.  
  37. // Test code: a control block and its usage
  38. #[derive(Clone)]
  39. struct CB {
  40.     gauge: Gauge,
  41. }
  42.  
  43. impl CB {
  44.     fn new() -> CB {
  45.         CB { gauge: Gauge::new() }
  46.     }
  47. }
  48.  
  49. fn main() {
  50.     let cb = CB::new();
  51.     let _cb2 = cb.clone();
  52. }
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