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[rustc.git] / src / test / run-pass / const-fn.rs
1 // Copyright 2015 The Rust Project Developers. See the COPYRIGHT
2 // file at the top-level directory of this distribution and at
3 // http://rust-lang.org/COPYRIGHT.
4 //
5 // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
6 // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
7 // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
8 // option. This file may not be copied, modified, or distributed
9 // except according to those terms.
10
11 // A very basic test of const fn functionality.
12
13 #![feature(const_fn, const_indexing)]
14
15 const fn add(x: u32, y: u32) -> u32 {
16 x + y
17 }
18
19 const fn sub(x: u32, y: u32) -> u32 {
20 x - y
21 }
22
23 const unsafe fn div(x: u32, y: u32) -> u32 {
24 x / y
25 }
26
27 const fn generic<T>(t: T) -> T {
28 t
29 }
30
31 const fn generic_arr<T: Copy>(t: [T; 1]) -> T {
32 t[0]
33 }
34
35 const SUM: u32 = add(44, 22);
36 const DIFF: u32 = sub(44, 22);
37 const DIV: u32 = unsafe{div(44, 22)};
38
39 fn main() {
40 assert_eq!(SUM, 66);
41 assert!(SUM != 88);
42
43 assert_eq!(DIFF, 22);
44 assert_eq!(DIV, 2);
45
46 let _: [&'static str; sub(100, 99) as usize] = ["hi"];
47 let _: [&'static str; generic(1)] = ["hi"];
48 let _: [&'static str; generic_arr([1])] = ["hi"];
49 }