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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 | ||
b7449926 | 11 | // run-pass |
62682a34 SL |
12 | trait Factory { |
13 | type Product; | |
14 | fn create(&self) -> <Self as Factory>::Product; | |
15 | } | |
16 | ||
17 | impl Factory for f64 { | |
18 | type Product = f64; | |
19 | fn create(&self) -> f64 { *self * *self } | |
20 | } | |
21 | ||
22 | impl<A: Factory, B: Factory> Factory for (A, B) { | |
23 | type Product = (<A as Factory>::Product, <B as Factory>::Product); | |
24 | fn create(&self) -> (<A as Factory>::Product, <B as Factory>::Product) { | |
25 | let (ref a, ref b) = *self; | |
26 | (a.create(), b.create()) | |
27 | } | |
28 | } | |
29 | ||
30 | fn main() { | |
31 | assert_eq!((16., 25.), (4., 5.).create()); | |
32 | } |