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.
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.
11 // Test overloading of the `[]` operator. In particular test that it
12 // takes its argument *by reference*.
19 struct AssociationList<K,V> {
20 pairs: Vec<AssociationPair<K,V>> }
23 struct AssociationPair<K,V> {
28 impl<K,V> AssociationList<K,V> {
29 fn push(&mut self, key: K, value: V) {
30 self.pairs.push(AssociationPair {key: key, value: value});
34 impl<'a, K: PartialEq + std::fmt::Debug, V:Clone> Index<&'a K> for AssociationList<K,V> {
37 fn index(&self, index: &K) -> &V {
38 for pair in &self.pairs {
39 if pair.key == *index {
43 panic!("No value found for key: {:?}", index);
48 let foo = "foo".to_string();
49 let bar = "bar".to_string();
51 let mut list = AssociationList {pairs: Vec::new()};
52 list.push(foo.clone(), 22);
53 list.push(bar.clone(), 44);
55 assert_eq!(list[&foo], 22);
56 assert_eq!(list[&bar], 44);
58 assert_eq!(list[&foo], 22);
59 assert_eq!(list[&bar], 44);