42 lines
952 B
Rust
42 lines
952 B
Rust
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// Copyright 2012 The Rust Project Developers. See the COPYRIGHT
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// file at the top-level directory of this distribution and at
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// http://rust-lang.org/COPYRIGHT.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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trait Positioned {
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fn SetX(&mut self, int);
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fn X(&self) -> int;
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}
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trait Movable: Positioned {
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fn translate(&mut self, dx: int) {
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let x = self.X();
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self.SetX(x + dx);
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}
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}
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struct Point { x: int, y: int }
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impl Positioned for Point {
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fn SetX(&mut self, x: int) {
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self.x = x;
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}
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fn X(&self) -> int {
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self.x
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}
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}
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impl Movable for Point {}
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pub fn main() {
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let mut p = Point{ x: 1, y: 2};
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p.translate(3);
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assert_eq!(p.X(), 4);
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}
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