| // 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. |
| |
| |
| struct Counter { |
| value: usize |
| } |
| |
| impl Counter { |
| fn new(v: usize) -> Counter { |
| Counter {value: v} |
| } |
| |
| fn inc<'a>(&'a mut self) -> &'a mut Counter { |
| self.value += 1; |
| self |
| } |
| |
| fn get(&self) -> usize { |
| self.value |
| } |
| |
| fn get_and_inc(&mut self) -> usize { |
| let v = self.value; |
| self.value += 1; |
| v |
| } |
| } |
| |
| pub fn main() { |
| let v = Counter::new(22).get_and_inc(); |
| assert_eq!(v, 22); |
| |
| let v = Counter::new(22).inc().inc().get(); |
| assert_eq!(v, 24); |
| } |