| // 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.identity() |
| /// Creates an insertion-ordered identity-based map. |
| /// Effectively a shorthand for: |
| /// new LinkedHashMap(equals: identical, hashCode: identityHashCode) |
| /// @description Checks that created hash map is equivalent of |
| /// new LinkedHashMap(equals: identical, hashCode: identityHashCode) |
| /// @author sgrekhov@unipro.ru |
| |
| import "../../../Utils/expect.dart"; |
| import "dart:collection"; |
| |
| class C { |
| int get hashCode => 1; |
| bool operator ==(Object c) { |
| return true; |
| } |
| } |
| |
| main() { |
| LinkedHashMap map1 = new LinkedHashMap.identity(); |
| LinkedHashMap map2 = new LinkedHashMap(equals: identical, |
| hashCode: identityHashCode); |
| LinkedHashMap map3 = new LinkedHashMap(); |
| |
| C key1 = new C(); |
| C key2 = new C(); |
| C key3 = new C(); |
| |
| map1[key1] = 1; |
| map1[key2] = 2; |
| map1[key3] = 3; |
| |
| map2[key1] = 1; |
| map2[key2] = 2; |
| map2[key3] = 3; |
| |
| map3[key1] = 1; |
| map3[key2] = 2; |
| map3[key3] = 3; |
| |
| Expect.equals(3, map1.length); |
| Expect.equals(3, map2.length); |
| Expect.equals(1, map3.length); |
| } |