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Sep 11th, 2019
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  1. use std::collections::HashMap;
  2. use std::hash::Hash;
  3.  
  4. #[derive(Debug)]
  5. struct Foo {
  6. v: i32
  7. }
  8.  
  9.  
  10. fn main() {
  11. let f = Foo {
  12. v: 20
  13. };
  14. let mut map: HashMap<i32, &Foo> = HashMap::new();
  15. map.insert(0, &f);
  16. let x = map.get_mut(&0).unwrap();
  17. x.v = 100;
  18. let c = map.get(&0).unwrap();
  19. dbg!(c);
  20. }
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