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// 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.
// There is some other borrowck bug, so we make the stuff not mut.
trait Positioned<S> {
fn SetX(&mut self, S);
fn X(&self) -> S;
}
trait Movable<S: Add<S, S>>: Positioned<S> {
fn translate(&mut self, dx: S) {
let x = self.X() + dx;
self.SetX(x);
}
}
struct Point<S> { x: S, y: S }
impl<S: Clone> Positioned<S> for Point<S> {
fn SetX(&mut self, x: S) {
self.x = x;
}
fn X(&self) -> S {
self.x.clone()
}
}
impl<S: Clone + Add<S, S>> Movable<S> for Point<S> {}
pub fn main() {
let mut p = Point{ x: 1, y: 2};
p.translate(3);
assert_eq!(p.X(), 4);
}
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