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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 | // There is some other borrowck bug, so we make the stuff not mut. | |
12 | ||
c34b1796 | 13 | |
1a4d82fc JJ |
14 | use std::ops::Add; |
15 | ||
16 | trait Positioned<S> { | |
17 | fn SetX(&mut self, S); | |
18 | fn X(&self) -> S; | |
19 | } | |
20 | ||
21 | trait Movable<S: Add<Output=S>>: Positioned<S> { | |
22 | fn translate(&mut self, dx: S) { | |
23 | let x = self.X() + dx; | |
24 | self.SetX(x); | |
25 | } | |
26 | } | |
27 | ||
28 | struct Point<S> { x: S, y: S } | |
29 | ||
30 | impl<S: Clone> Positioned<S> for Point<S> { | |
31 | fn SetX(&mut self, x: S) { | |
32 | self.x = x; | |
33 | } | |
34 | fn X(&self) -> S { | |
35 | self.x.clone() | |
36 | } | |
37 | } | |
38 | ||
39 | impl<S: Clone + Add<Output=S>> Movable<S> for Point<S> {} | |
40 | ||
41 | pub fn main() { | |
85aaf69f | 42 | let mut p = Point{ x: 1, y: 2}; |
1a4d82fc JJ |
43 | p.translate(3); |
44 | assert_eq!(p.X(), 4); | |
45 | } |