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1 | // Copyright 2013 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 | |
c34b1796 | 12 | |
1a4d82fc JJ |
13 | trait vec_utils<T> { |
14 | fn map_<U, F>(x: &Self, f: F) -> Vec<U> where F: FnMut(&T) -> U; | |
15 | } | |
970d7e83 | 16 | |
1a4d82fc JJ |
17 | impl<T> vec_utils<T> for Vec<T> { |
18 | fn map_<U, F>(x: &Vec<T> , mut f: F) -> Vec<U> where F: FnMut(&T) -> U { | |
19 | let mut r = Vec::new(); | |
85aaf69f | 20 | for elt in x { |
1a4d82fc | 21 | r.push(f(elt)); |
970d7e83 | 22 | } |
1a4d82fc | 23 | r |
970d7e83 | 24 | } |
223e47cc | 25 | } |
1a4d82fc JJ |
26 | |
27 | pub fn main() { | |
c30ab7b3 | 28 | assert_eq!(vec_utils::map_(&vec![1,2,3], |&x| x+1), [2,3,4]); |
1a4d82fc | 29 | } |