src/test/run-pass/operator-multidispatch.rs

   1 // Copyright 2014 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 // Test that we can overload the `+` operator for points so that two
  12 // points can be added, and a point can be added to an integer.
  13
  14 use std::ops;
  15
  16 #[derive(Debug,PartialEq,Eq)]
  17 struct Point {
  18     x: isize,
  19     y: isize
  20 }
  21
  22 impl ops::Add for Point {
  23     type Output = Point;
  24
  25     fn add(self, other: Point) -> Point {
  26         Point {x: self.x + other.x, y: self.y + other.y}
  27     }
  28 }
  29
  30 impl ops::Add<isize> for Point {
  31     type Output = Point;
  32
  33     fn add(self, other: isize) -> Point {
  34         Point {x: self.x + other,
  35                y: self.y + other}
  36     }
  37 }
  38
  39 pub fn main() {
  40     let mut p = Point {x: 10, y: 20};
  41     p = p + Point {x: 101, y: 102};
  42     assert_eq!(p, Point {x: 111, y: 122});
  43     p = p + 1;
  44     assert_eq!(p, Point {x: 112, y: 123});
  45 }