| // Copyright 2012 The Rust Project Developers. See the COPYRIGHT |
| // file at the top-level directory of this distribution and at |
| // http://rust-lang.org/COPYRIGHT. |
| // |
| // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or |
| // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license |
| // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your |
| // option. This file may not be copied, modified, or distributed |
| // except according to those terms. |
| |
| use std::cmp::PartialEq; |
| use std::ops::{Add, Sub, Mul}; |
| |
| trait MyNum : Add<Output=Self> + Sub<Output=Self> + Mul<Output=Self> + PartialEq + Clone { } |
| |
| #[derive(Clone, Debug)] |
| struct MyInt { val: isize } |
| |
| impl Add for MyInt { |
| type Output = MyInt; |
| |
| fn add(self, other: MyInt) -> MyInt { mi(self.val + other.val) } |
| } |
| |
| impl Sub for MyInt { |
| type Output = MyInt; |
| |
| fn sub(self, other: MyInt) -> MyInt { mi(self.val - other.val) } |
| } |
| |
| impl Mul for MyInt { |
| type Output = MyInt; |
| |
| fn mul(self, other: MyInt) -> MyInt { mi(self.val * other.val) } |
| } |
| |
| impl PartialEq for MyInt { |
| fn eq(&self, other: &MyInt) -> bool { self.val == other.val } |
| fn ne(&self, other: &MyInt) -> bool { !self.eq(other) } |
| } |
| |
| impl MyNum for MyInt {} |
| |
| fn f<T:MyNum>(x: T, y: T) -> (T, T, T) { |
| return (x.clone() + y.clone(), x.clone() - y.clone(), x * y); |
| } |
| |
| fn mi(v: isize) -> MyInt { MyInt { val: v } } |
| |
| pub fn main() { |
| let (x, y) = (mi(3), mi(5)); |
| let (a, b, c) = f(x, y); |
| assert_eq!(a, mi(8)); |
| assert_eq!(b, mi(-2)); |
| assert_eq!(c, mi(15)); |
| } |