| // 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 LinkedHashSet({bool equals(E e1, E e2), int hashCode(E e), |
| /// 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 [isValidKey] is ignored if [equals] and [hashCode] |
| /// are omitted |
| /// @author sgrekhov@unipro.ru |
| |
| import "../../../Utils/expect.dart"; |
| import "dart:collection"; |
| |
| bool isValidKey(var potentialKey) => potentialKey < 100; |
| |
| main() { |
| LinkedHashSet<int> set = new LinkedHashSet<int>(isValidKey: isValidKey); |
| |
| set.add(1); |
| Expect.isTrue(set.contains(1)); |
| |
| set.add(101); |
| Expect.isFalse(set.contains(101)); |
| } |