| // Copyright 2012-2014 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. |
| |
| #![allow(non_camel_case_types)] |
| |
| #[cfg(feature = "use_core")] |
| extern crate core; |
| |
| #[macro_use] |
| extern crate derivative; |
| |
| trait noisy { |
| fn speak(&mut self); |
| } |
| |
| #[derive(Derivative)] |
| #[derivative(Clone)] |
| struct cat { |
| meows : usize, |
| |
| how_hungry : isize, |
| name : String, |
| } |
| |
| impl cat { |
| fn meow(&mut self) { |
| println!("Meow"); |
| self.meows += 1_usize; |
| if self.meows % 5_usize == 0_usize { |
| self.how_hungry += 1; |
| } |
| } |
| } |
| |
| impl cat { |
| pub fn eat(&mut self) -> bool { |
| if self.how_hungry > 0 { |
| println!("OM NOM NOM"); |
| self.how_hungry -= 2; |
| true |
| } else { |
| println!("Not hungry!"); |
| false |
| } |
| } |
| } |
| |
| impl noisy for cat { |
| fn speak(&mut self) { self.meow(); } |
| } |
| |
| fn cat(in_x : usize, in_y : isize, in_name: String) -> cat { |
| cat { |
| meows: in_x, |
| how_hungry: in_y, |
| name: in_name, |
| } |
| } |
| |
| |
| fn make_speak<C:noisy>(mut c: C) { |
| c.speak(); |
| } |
| |
| #[test] |
| fn main() { |
| let mut nyan = cat(0_usize, 2, "nyan".to_string()); |
| nyan.eat(); |
| assert!((!nyan.eat())); |
| for _ in 1_usize..10_usize { |
| make_speak(nyan.clone()); |
| } |
| } |