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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 #![allow(dead_code)]
13 #![allow(non_snake_case)]
14
15 use std::ops::Add;
16
17 trait Positioned<S> {
18 fn SetX(&mut self, _: S);
19 fn X(&self) -> S;
20 }
21
22 trait Movable<S: Add<Output=S>>: Positioned<S> {
23 fn translate(&mut self, dx: S) {
24 let x = self.X() + dx;
25 self.SetX(x);
26 }
27 }
28
29 struct Point { x: isize, y: isize }
30
31 impl Positioned<isize> for Point {
32 fn SetX(&mut self, x: isize) {
33 self.x = x;
34 }
35 fn X(&self) -> isize {
36 self.x
37 }
38 }
39
40 impl Movable<isize> for Point {}
41
42 pub fn main() {
43 let mut p = Point{ x: 1, y: 2};
44 p.translate(3);
45 assert_eq!(p.X(), 4);
46 }