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;
12 use std::ops::{Add, Sub, Mul};
14 trait MyNum : Add<Output=Self> + Sub<Output=Self> + Mul<Output=Self> + PartialEq + Clone { }
16 #[derive(Clone, Debug)]
17 struct MyInt { val: isize }
22 fn add(self, other: MyInt) -> MyInt { mi(self.val + other.val) }
28 fn sub(self, other: MyInt) -> MyInt { mi(self.val - other.val) }
34 fn mul(self, other: MyInt) -> MyInt { mi(self.val * other.val) }
37 impl PartialEq for MyInt {
38 fn eq(&self, other: &MyInt) -> bool { self.val == other.val }
39 fn ne(&self, other: &MyInt) -> bool { !self.eq(other) }
42 impl MyNum for MyInt {}
44 fn f<T:MyNum>(x: T, y: T) -> (T, T, T) {
45 return (x.clone() + y.clone(), x.clone() - y.clone(), x * y);
48 fn mi(v: isize) -> MyInt { MyInt { val: v } }
51 let (x, y) = (mi(3), mi(5));
52 let (a, b, c) = f(x, y);
54 assert_eq!(b, mi(-2));
55 assert_eq!(c, mi(15));