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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 | ||
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11 | |
12 | #![feature(lang_items, unboxed_closures, core)] | |
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13 | |
14 | use std::ops::{Fn, FnMut, FnOnce}; | |
15 | ||
16 | struct S1 { | |
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17 | x: i32, |
18 | y: i32, | |
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19 | } |
20 | ||
85aaf69f | 21 | impl FnMut<(i32,)> for S1 { |
85aaf69f | 22 | extern "rust-call" fn call_mut(&mut self, (z,): (i32,)) -> i32 { |
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23 | self.x * self.y * z |
24 | } | |
25 | } | |
26 | ||
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27 | impl FnOnce<(i32,)> for S1 { |
28 | type Output = i32; | |
29 | extern "rust-call" fn call_once(mut self, args: (i32,)) -> i32 { | |
30 | self.call_mut(args) | |
31 | } | |
32 | } | |
33 | ||
1a4d82fc | 34 | struct S2 { |
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35 | x: i32, |
36 | y: i32, | |
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37 | } |
38 | ||
85aaf69f | 39 | impl Fn<(i32,)> for S2 { |
85aaf69f | 40 | extern "rust-call" fn call(&self, (z,): (i32,)) -> i32 { |
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41 | self.x * self.y * z |
42 | } | |
43 | } | |
44 | ||
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45 | impl FnMut<(i32,)> for S2 { |
46 | extern "rust-call" fn call_mut(&mut self, args: (i32,)) -> i32 { self.call(args) } | |
47 | } | |
48 | ||
49 | impl FnOnce<(i32,)> for S2 { | |
50 | type Output = i32; | |
51 | extern "rust-call" fn call_once(self, args: (i32,)) -> i32 { self.call(args) } | |
52 | } | |
53 | ||
1a4d82fc | 54 | struct S3 { |
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55 | x: i32, |
56 | y: i32, | |
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57 | } |
58 | ||
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59 | impl FnOnce<(i32,i32)> for S3 { |
60 | type Output = i32; | |
61 | extern "rust-call" fn call_once(self, (z,zz): (i32,i32)) -> i32 { | |
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62 | self.x * self.y * z * zz |
63 | } | |
64 | } | |
65 | ||
66 | fn main() { | |
67 | let mut s = S1 { | |
68 | x: 3, | |
69 | y: 3, | |
70 | }; | |
71 | let ans = s(3); | |
72 | ||
73 | assert_eq!(ans, 27); | |
74 | let s = S2 { | |
75 | x: 3, | |
76 | y: 3, | |
77 | }; | |
78 | let ans = s.call((3,)); | |
79 | assert_eq!(ans, 27); | |
80 | ||
81 | let s = S3 { | |
82 | x: 3, | |
83 | y: 3, | |
84 | }; | |
85 | let ans = s(3, 1); | |
86 | assert_eq!(ans, 27); | |
87 | } |