daily pastebin goal
58%
SHARE
TWEET

Untitled

a guest Jan 22nd, 2019 62 Never
Not a member of Pastebin yet? Sign Up, it unlocks many cool features!
  1. trait DoerMaker {
  2.   type T: StuffDoer;
  3.   fn make_doer(&self, f: Foo) -> Self::T;
  4. }
  5.  
  6. trait StuffDoer {
  7.   fn do_stuff(&self) -> Option<()>;
  8. }
  9.  
  10. impl<T: StuffDoer + ?Sized> StuffDoer for Box<T> {
  11.     fn do_stuff(&self) -> Option<()> {
  12.         (**self).do_stuff()
  13.     }
  14. }
  15.  
  16. enum Foo {
  17.   A,
  18.   B,
  19.   C,
  20. }
  21.  
  22. struct Bar;
  23. impl DoerMaker for Bar {
  24.   type T=Box<StuffDoer>;
  25.  
  26.   fn make_doer(&self, f: Foo) -> Box<StuffDoer> {
  27.     match f {
  28.       Foo::A => Box::new(Baz{}),
  29.       Foo::B => Box::new(Bat{}),
  30.       Foo::C => Box::new(Bang{}),
  31.     }
  32.   }
  33. }
  34.  
  35. struct Baz;
  36. impl StuffDoer for Baz {
  37.   fn do_stuff(&self) -> Option<()> {
  38.     None
  39.   }
  40. }
  41.  
  42. struct Bat;
  43. impl StuffDoer for Bat {
  44.   fn do_stuff(&self) -> Option<()> {
  45.     None
  46.   }
  47. }
  48.  
  49. struct Bang;
  50. impl StuffDoer for Bang {
  51.   fn do_stuff(&self) -> Option<()> {
  52.     None
  53.   }
  54. }
RAW Paste Data
We use cookies for various purposes including analytics. By continuing to use Pastebin, you agree to our use of cookies as described in the Cookies Policy. OK, I Understand
 
Top