| // 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)]) |
| /// ... |
| /// Keys of the map are compared using the compare function passed in the |
| /// constructor, both for ordering and for equality. |
| /// If the [compare] function is omitted, the objects are assumed to be |
| /// [Comparable], and are compared using their [Comparable.compareTo] method. |
| /// Non-comparable objects (including [null]) will not work as keys in that case. |
| /// @description Checks that if compare function is not specified then key object |
| /// should implement comparable. |
| /// @author sgrekhov@unipro.ru |
| |
| import "dart:collection"; |
| import "../../../Utils/expect.dart"; |
| |
| class C implements Comparable { |
| int value; |
| C(this.value); |
| |
| compareTo(Object? other) { |
| return this.value - (other as C).value; |
| } |
| } |
| |
| main() { |
| SplayTreeMap map = new SplayTreeMap(); |
| C c1 = new C(2); |
| C c2 = new C(1); |
| |
| map[c1] = 1; |
| map[c2] = 2; |
| |
| Expect.equals(c2, map.firstKey()); |
| Expect.equals(c1, map.lastKey()); |
| } |