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1 | // Copyright 2014 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 | // Test that we can infer the Target based on the Self or vice versa. | |
12 | ||
c34b1796 | 13 | |
1a4d82fc JJ |
14 | use std::mem; |
15 | ||
16 | trait Convert<Target> { | |
17 | fn convert(&self) -> Target; | |
18 | } | |
19 | ||
20 | impl Convert<u32> for i16 { | |
21 | fn convert(&self) -> u32 { | |
22 | *self as u32 | |
23 | } | |
24 | } | |
25 | ||
26 | impl Convert<i16> for u32 { | |
27 | fn convert(&self) -> i16 { | |
28 | *self as i16 | |
29 | } | |
30 | } | |
31 | ||
c34b1796 | 32 | fn test<T,U>(_: T, _: U, t_size: usize, u_size: usize) |
1a4d82fc JJ |
33 | where T : Convert<U> |
34 | { | |
35 | assert_eq!(mem::size_of::<T>(), t_size); | |
36 | assert_eq!(mem::size_of::<U>(), u_size); | |
37 | } | |
38 | ||
39 | fn main() { | |
40 | use std::default::Default; | |
41 | // T = i16, U = u32 | |
42 | test(22_i16, Default::default(), 2, 4); | |
43 | ||
44 | // T = u32, U = i16 | |
45 | test(22_u32, Default::default(), 4, 2); | |
46 | } |