| // Copyright (c) 2013, 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. |
| |
| // @dart = 2.9 |
| |
| import "package:expect/expect.dart"; |
| |
| void main() { |
| var hva = new HasValueA(); |
| hva.value = '42'; |
| Expect.equals('42', hva.value); |
| |
| var hvb = new HasValueB(); |
| hvb.value = '87'; |
| Expect.equals('87', hvb.value); |
| |
| var hvc = new HasValueC(); |
| hvc.value = '99'; |
| Expect.equals('99', hvc.value); |
| } |
| |
| abstract class Delegate { |
| String invoke(String value); |
| } |
| |
| abstract class DelegateMixin { |
| String invoke(String value) => value; |
| } |
| |
| abstract class HasValueMixin implements Delegate { |
| String _value; |
| set value(String value) { |
| _value = invoke(value); |
| } |
| |
| String get value => _value; |
| } |
| |
| class HasValueA extends Object with HasValueMixin, DelegateMixin {} |
| |
| class HasValueB extends Object with DelegateMixin, HasValueMixin {} |
| |
| class HasValueC extends Object with HasValueMixin { |
| String invoke(String value) => value; |
| } |