32 lines
1.2 KiB
Rust
32 lines
1.2 KiB
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.
|
|
|
|
enum pattern { tabby, tortoiseshell, calico }
|
|
enum breed { beagle, rottweiler, pug }
|
|
type name = String;
|
|
enum ear_kind { lop, upright }
|
|
enum animal { cat(pattern), dog(breed), rabbit(name, ear_kind), tiger }
|
|
|
|
fn noise(a: animal) -> Option<String> {
|
|
match a {
|
|
cat(..) => { Some("meow".to_string()) }
|
|
dog(..) => { Some("woof".to_string()) }
|
|
rabbit(..) => { None }
|
|
tiger(..) => { Some("roar".to_string()) }
|
|
}
|
|
}
|
|
|
|
pub fn main() {
|
|
assert_eq!(noise(cat(tabby)), Some("meow".to_string()));
|
|
assert_eq!(noise(dog(pug)), Some("woof".to_string()));
|
|
assert_eq!(noise(rabbit("Hilbert".to_string(), upright)), None);
|
|
assert_eq!(noise(tiger), Some("roar".to_string()));
|
|
}
|