| // 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. |
| |
| #![feature(box_syntax)] |
| |
| trait noisy { |
| fn speak(&self); |
| } |
| |
| struct cat { |
| meows : usize, |
| |
| how_hungry : isize, |
| name : String, |
| } |
| |
| impl cat { |
| pub fn eat(&self) -> bool { |
| if self.how_hungry > 0 { |
| println!("OM NOM NOM"); |
| self.how_hungry -= 2; |
| return true; |
| } |
| else { |
| println!("Not hungry!"); |
| return false; |
| } |
| } |
| } |
| |
| impl noisy for cat { |
| fn speak(&self) { self.meow(); } |
| |
| } |
| |
| impl cat { |
| fn meow(&self) { |
| println!("Meow"); |
| self.meows += 1; |
| if self.meows % 5 == 0 { |
| self.how_hungry += 1; |
| } |
| } |
| } |
| |
| fn cat(in_x : usize, in_y : isize, in_name: String) -> cat { |
| cat { |
| meows: in_x, |
| how_hungry: in_y, |
| name: in_name |
| } |
| } |
| |
| fn main() { |
| let nyan: Box<noisy> = box cat(0, 2, "nyan".to_string()) as Box<noisy>; |
| nyan.eat(); //~ ERROR no method named `eat` found |
| } |