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  1. struct Droppable {
  2.     name: &'static str, // '
  3. }
  4. impl Drop for Droppable {
  5.     fn drop(&mut self) {
  6.         println!("> Dropping {}", self.name);
  7.     }
  8. }
  9. use std::fmt;
  10. impl fmt::Display for Droppable {
  11.     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
  12.         write!(f, "{}", self.name)
  13.     }
  14. }
  15. impl fmt::Debug for Droppable {
  16.     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
  17.         write!(f, "{}", self.name)
  18.     }
  19. }
  20. impl Clone for Droppable {
  21.     fn clone(&self) -> Droppable { Droppable {name: self.name}}
  22. }
  23. fn main() {
  24.     {
  25.         let mut v = Vec::new();
  26.         let a = Box::new(Droppable {name: "B"});
  27.         v.push(Box::clone(&a));
  28.         v.push(Box::clone(&a));
  29.         v.push(a);
  30.         println!("{:?}", v);
  31.     }
  32.     {
  33.         use std::rc::Rc;
  34.         let mut v = Vec::new();
  35.         let a = Rc::new(Droppable {name: "R"});
  36.         v.push(Rc::clone(&a));
  37.         v.push(Rc::clone(&a));
  38.         v.push(a);
  39.         println!("{:?}", v);
  40.     }
  41. }
  42.  
Success #stdin #stdout 0s 14864KB
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[B, B, B]
> Dropping B
> Dropping B
> Dropping B
[R, R, R]
> Dropping R
https://ideone.com/IP9Jk4
language:
Rust (rust 1.56)
created:
7 years ago
visibility:
public

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