| // Copyright (c) 2022, 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 target property |
| /// T? target |
| /// The current object weakly referenced by this, if any. |
| /// |
| /// The value is either the object supplied in the constructor, or null if the |
| /// weak reference has been cleared. |
| /// |
| /// @description Check that the value of this property value is either the |
| /// object supplied in the constructor, or null if the weak reference has been |
| /// cleared |
| /// @author sgrekhov@unipro.ru |
| |
| import "dart:async"; |
| import "../gc_utils_lib.dart"; |
| import "../../../Utils/expect.dart"; |
| |
| class C { |
| int id; |
| C(this.id); |
| } |
| |
| main() async { |
| C? c1 = C(42); |
| WeakReference<C> wr = WeakReference(c1); |
| asyncStart(); |
| Future<C?>.delayed(Duration(milliseconds: 1), () => c1).then((C? c2) async { |
| Expect.isNotNull(wr.target); |
| Expect.equals(c1, wr.target); |
| triggerGc(); |
| await Future.delayed(Duration(milliseconds: 1)); |
| Expect.isNotNull(wr.target); |
| c2 = null; |
| triggerGc(); |
| await Future.delayed(Duration(milliseconds: 1)); |
| Expect.isNotNull(wr.target); |
| asyncEnd(); |
| }); |
| Expect.isNotNull(wr.target); |
| Expect.equals(c1, wr.target); |
| await Future.delayed(Duration(seconds: 1)); |
| c1 = null; |
| triggerGc(); |
| Expect.isNull(wr.target); |
| } |