src/test/ui/associated-types/associated-types-bound.rs

   1 // run-pass
   2 // Test equality constrai32s on associated types in a where clause.
   3
   4
   5 pub trait ToI32 {
   6     fn to_i32(&self) -> i32;
   7 }
   8
   9 impl ToI32 for i32 {
  10     fn to_i32(&self) -> i32 { *self }
  11 }
  12
  13 impl ToI32 for u32 {
  14     fn to_i32(&self) -> i32 { *self as i32 }
  15 }
  16
  17 pub trait GetToI32
  18 {
  19     type R : ToI32;
  20
  21     fn get(&self) -> <Self as GetToI32>::R;
  22 }
  23
  24 impl GetToI32 for i32 {
  25     type R = i32;
  26     fn get(&self) -> i32 { *self }
  27 }
  28
  29 impl GetToI32 for u32 {
  30     type R = u32;
  31     fn get(&self) -> u32 { *self }
  32 }
  33
  34 fn foo<G>(g: G) -> i32
  35     where G : GetToI32
  36 {
  37     ToI32::to_i32(&g.get())
  38 }
  39
  40 pub fn main() {
  41     assert_eq!(foo(22i32), 22);
  42     assert_eq!(foo(22u32), 22);
  43 }