| // 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(unused_parens)] |
| // aux-build:cond_plugin.rs |
| |
| #![feature(proc_macro_hygiene)] |
| |
| extern crate cond_plugin; |
| |
| use cond_plugin::cond; |
| |
| fn fact(n : i64) -> i64 { |
| if n == 0 { |
| 1 |
| } else { |
| n * fact(n - 1) |
| } |
| } |
| |
| fn fact_cond(n : i64) -> i64 { |
| cond!( |
| ((n == 0) 1) |
| (else (n * fact_cond(n-1))) |
| ) |
| } |
| |
| fn fib(n : i64) -> i64 { |
| if n == 0 || n == 1 { |
| 1 |
| } else { |
| fib(n-1) + fib(n-2) |
| } |
| } |
| |
| fn fib_cond(n : i64) -> i64 { |
| cond!( |
| ((n == 0) 1) |
| ((n == 1) 1) |
| (else (fib_cond(n-1) + fib_cond(n-2))) |
| ) |
| } |
| |
| fn main() { |
| assert_eq!(fact(3), fact_cond(3)); |
| assert_eq!(fact(5), fact_cond(5)); |
| assert_eq!(fib(5), fib_cond(5)); |
| assert_eq!(fib(8), fib_cond(8)); |
| } |