src/test/run-pass/trait-inheritance-subst.rs

   1 // Copyright 2012 The Rust Project Developers. See the COPYRIGHT
   2 // file at the top-level directory of this distribution and at
   3 // http://rust-lang.org/COPYRIGHT.
   4 //
   5 // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
   6 // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
   7 // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
   8 // option. This file may not be copied, modified, or distributed
   9 // except according to those terms.
  10
  11 pub trait Add<RHS,Result> {
  12     fn add(&self, rhs: &RHS) -> Result;
  13 }
  14
  15 trait MyNum : Add<Self,Self> { }
  16
  17 struct MyInt { val: int }
  18
  19 impl Add<MyInt, MyInt> for MyInt {
  20     fn add(&self, other: &MyInt) -> MyInt { mi(self.val + other.val) }
  21 }
  22
  23 impl MyNum for MyInt;
  24
  25 fn f<T:MyNum>(x: T, y: T) -> T {
  26     return x.add(&y);
  27 }
  28
  29 fn mi(v: int) -> MyInt { MyInt { val: v } }
  30
  31 pub fn main() {
  32     let (x, y) = (mi(3), mi(5));
  33     let z = f(x, y);
  34     assert!(z.val == 8)
  35 }
  36