| // 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 using methods like operator [], [remove] and [containsKey] together with a |
| /// custom equality and hashcode, an extra [isValidKey] function can be supplied. |
| /// This function is called before calling [equals] or [hashCode] with an |
| /// argument that may not be a [K] instance, and if the call returns [false], the |
| /// key is assumed to not be in the set. The [isValidKey] function defaults to |
| /// just testing if the object is a [K] instance. |
| /// @description Checks that [isValidKey] is not ignored if [equals] and |
| /// [hashCode] are not specified. Test [LinkedHashMap<int>] |
| /// @author sgrekhov@unipro.ru |
| |
| import "../../../Utils/expect.dart"; |
| import "dart:collection"; |
| |
| bool called = false; |
| |
| bool isValidKey(var potentialKey) { |
| called = true; |
| return (potentialKey is int) && potentialKey < 100; |
| } |
| |
| main() { |
| LinkedHashMap<int, num> map = |
| new LinkedHashMap<int, num>(isValidKey: isValidKey); |
| |
| map[101] = 1.1; |
| |
| Expect.isNull(map[101]); |
| Expect.isTrue(called); |
| |
| called = false; |
| Expect.isFalse(map.containsKey(101)); |
| Expect.isTrue(called); |
| |
| called = false; |
| Expect.isNull(map.remove(101)); |
| Expect.isTrue(called); |
| } |