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1 | // Copyright 2012 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 | ||
223e47cc | 11 | |
92a42be0 | 12 | #![feature(unboxed_closures, fn_traits)] |
c34b1796 AL |
13 | |
14 | use std::ops::FnMut; | |
970d7e83 | 15 | |
1a4d82fc | 16 | struct S { |
85aaf69f SL |
17 | x: i32, |
18 | y: i32, | |
1a4d82fc | 19 | } |
223e47cc | 20 | |
85aaf69f | 21 | impl FnMut<()> for S { |
85aaf69f | 22 | extern "rust-call" fn call_mut(&mut self, (): ()) -> i32 { |
1a4d82fc | 23 | self.x * self.y |
223e47cc LB |
24 | } |
25 | } | |
26 | ||
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27 | impl FnOnce<()> for S { |
28 | type Output = i32; | |
29 | extern "rust-call" fn call_once(mut self, args: ()) -> i32 { self.call_mut(args) } | |
30 | } | |
31 | ||
223e47cc | 32 | fn main() { |
1a4d82fc JJ |
33 | let mut s = S { |
34 | x: 3, | |
35 | y: 3, | |
36 | }; | |
37 | let ans = s(); | |
38 | assert_eq!(ans, 9); | |
223e47cc | 39 | } |