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.
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.
11 use std::cmp::PartialEq;
13 trait MyNum : Add<Self,Self> + Sub<Self,Self> + Mul<Self,Self> + PartialEq { }
16 struct MyInt { val: int }
18 impl Add<MyInt, MyInt> for MyInt {
19 fn add(&self, other: &MyInt) -> MyInt { mi(self.val + other.val) }
22 impl Sub<MyInt, MyInt> for MyInt {
23 fn sub(&self, other: &MyInt) -> MyInt { mi(self.val - other.val) }
26 impl Mul<MyInt, MyInt> for MyInt {
27 fn mul(&self, other: &MyInt) -> MyInt { mi(self.val * other.val) }
30 impl PartialEq for MyInt {
31 fn eq(&self, other: &MyInt) -> bool { self.val == other.val }
32 fn ne(&self, other: &MyInt) -> bool { !self.eq(other) }
35 impl MyNum for MyInt {}
37 fn f<T:MyNum>(x: T, y: T) -> (T, T, T) {
38 return (x + y, x - y, x * y);
41 fn mi(v: int) -> MyInt { MyInt { val: v } }
44 let (x, y) = (mi(3), mi(5));
45 let (a, b, c) = f(x, y);
47 assert_eq!(b, mi(-2));
48 assert_eq!(c, mi(15));