src/test/ui/run-pass/traits/trait-inheritance-overloading.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 // run-pass
  12 use std::cmp::PartialEq;
  13 use std::ops::{Add, Sub, Mul};
  14
  15 trait MyNum : Add<Output=Self> + Sub<Output=Self> + Mul<Output=Self> + PartialEq + Clone { }
  16
  17 #[derive(Clone, Debug)]
  18 struct MyInt { val: isize }
  19
  20 impl Add for MyInt {
  21     type Output = MyInt;
  22
  23     fn add(self, other: MyInt) -> MyInt { mi(self.val + other.val) }
  24 }
  25
  26 impl Sub for MyInt {
  27     type Output = MyInt;
  28
  29     fn sub(self, other: MyInt) -> MyInt { mi(self.val - other.val) }
  30 }
  31
  32 impl Mul for MyInt {
  33     type Output = MyInt;
  34
  35     fn mul(self, other: MyInt) -> MyInt { mi(self.val * other.val) }
  36 }
  37
  38 impl PartialEq for MyInt {
  39     fn eq(&self, other: &MyInt) -> bool { self.val == other.val }
  40     fn ne(&self, other: &MyInt) -> bool { !self.eq(other) }
  41 }
  42
  43 impl MyNum for MyInt {}
  44
  45 fn f<T:MyNum>(x: T, y: T) -> (T, T, T) {
  46     return (x.clone() + y.clone(), x.clone() - y.clone(), x * y);
  47 }
  48
  49 fn mi(v: isize) -> MyInt { MyInt { val: v } }
  50
  51 pub fn main() {
  52     let (x, y) = (mi(3), mi(5));
  53     let (a, b, c) = f(x, y);
  54     assert_eq!(a, mi(8));
  55     assert_eq!(b, mi(-2));
  56     assert_eq!(c, mi(15));
  57 }