| // 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 SplayTreeMap([int compare(K key1, K key2), |
| /// bool isValidKey(potentialKey)]) |
| /// To allow calling operator[], [remove] or [containsKey] with objects that are |
| /// not supported by the [compare] function, an extra [isValidKey] predicate |
| /// function can be supplied. This function is tested before using the [compare] |
| /// function on an argument value that may not be a [K] value. |
| /// @description Checks that if [isValidKey] supplied and returns [false] then |
| /// element is assumed not to be in a map |
| /// @author sgrekhov@unipro.ru |
| |
| import "dart:collection"; |
| import "../../../Utils/expect.dart"; |
| |
| class C { |
| int value; |
| C(this.value); |
| } |
| |
| int compare(var key1, var key2) { |
| return key1.value - key2.value; |
| } |
| |
| bool isValidKey(var potentialKey) => potentialKey.value != 3; |
| |
| main() { |
| SplayTreeMap map = new SplayTreeMap(compare, isValidKey); |
| C c1 = new C(1); |
| C c2 = new C(2); |
| C c3 = new C(3); |
| |
| map[c1] = 1; |
| map[c2] = 2; |
| map[c3] = 3; |
| |
| Expect.equals(3, map.length); |
| Expect.isNull(map[c3]); |
| Expect.isFalse(map.containsKey(c3)); |
| Expect.isNull(map.remove(c3)); |
| } |