| // Copyright (c) 2015, 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 Evaluation of a conditional property extraction expression e of |
| /// the form e1?.id is equivalent to the evaluation of the expression |
| /// ((x) => x == null?null : x.id)(e1), unless e1 is a type literal, in which |
| /// case it is equivalent to e1.m. |
| /// @description Check that e1?.id is equivalent to |
| /// ((x) => x == null?null : x.id)(e1). Test conditional method extraction |
| /// @author sgrekhov@unipro.ru |
| |
| import '../../../Utils/expect.dart'; |
| |
| class A { |
| String? id1() => "id1"; |
| } |
| |
| class C extends A { |
| String? id2() => "id2"; |
| } |
| |
| main() { |
| C c1 = new C(); |
| C? c2 = null; |
| var c3 = c1 as C?; |
| |
| Expect.equals(c1.id1, c3?.id1); |
| Expect.equals(c1.id2, c3?.id2); |
| |
| Expect.isNull(c2?.id1); |
| Expect.isNull(c2?.id2); |
| } |