// Copyright 2013 The Rust Project Developers. See the COPYRIGHT // file at the top-level directory of this distribution and at // http://rust-lang.org/COPYRIGHT. // // Licensed under the Apache License, Version 2.0 or the MIT license // , at your // option. This file may not be copied, modified, or distributed // except according to those terms. trait vec_utils { fn map_(x: &Self, f: &fn(&T) -> U) -> ~[U]; } impl vec_utils for ~[T] { fn map_(x: &~[T], f: &fn(&T) -> U) -> ~[U] { let mut r = ~[]; for elt in x.iter() { r.push(f(elt)); } r } } fn main() { assert_eq!(vec_utils::map_(&~[1,2,3], |&x| x+1), ~[2,3,4]); }