| /* |
| * Copyright (c) 2016, the Dart project authors. Please see the AUTHORS file |
| * for details. All rights reserved. Use of this source code is governed by a |
| * BSD-style license that can be found in the LICENSE file. |
| */ |
| /** |
| * @assertion LinkedHashMap({bool equals(K key1, K key2), int hashCode(K key), |
| * bool isValidKey(potentialKey)}) |
| * If the [equals] or [hashCode] methods won't work on all objects, but only on |
| * some instances of [E], the [isValidKey] predicate can be used to restrict the |
| * keys that the functions are applied to. Any key for which [isValidKey] |
| * returns false is automatically assumed to not be in the set when asking |
| * [contains]. |
| * @description Checks that if [isValidKey] returns [false] then value is in set |
| * in spite of [contains] returns [false] |
| * @author sgrekhov@unipro.ru |
| */ |
| import "../../../Utils/expect.dart"; |
| import "dart:collection"; |
| |
| bool isValidKey(var potentialKey) { |
| return potentialKey < 100; |
| } |
| |
| main() { |
| LinkedHashSet set = new LinkedHashSet(isValidKey: isValidKey); |
| |
| set.add(1); |
| Expect.isTrue(set.contains(1)); |
| |
| set.add(101); |
| Expect.isFalse(set.contains(101)); |
| |
| Expect.equals(2, set.length); |
| Expect.equals(1, set.elementAt(0)); |
| Expect.equals(101, set.elementAt(1)); |
| } |