41 lines
975 B
Rust
41 lines
975 B
Rust
// 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.
|
|
|
|
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 { x: int, y: int }
|
|
|
|
impl Positioned<int> for Point {
|
|
fn SetX(&mut self, x: int) {
|
|
self.x = x;
|
|
}
|
|
fn X(&self) -> int {
|
|
self.x
|
|
}
|
|
}
|
|
|
|
impl Movable<int> for Point {}
|
|
|
|
pub fn main() {
|
|
let mut p = Point{ x: 1, y: 2};
|
|
p.translate(3);
|
|
assert_eq!(p.X(), 4);
|
|
}
|