| // 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 Evaluation of a compound assignment of the form e1?.v op = e2 is |
| /// equivalent to ((x) => x?.v = x.v op e2)(e1) where x is a variable that is not |
| /// used in e2. |
| /// @description Checks that an expression of the form e1?.v &= e2 is equivalent |
| /// to ((x) => x?.v = x.v & e2)(e1) where x is a variable that is not used in e2. |
| /// @static-warning |
| /// @author sgrekhov@unipro.ru |
| |
| |
| import '../../../../Utils/expect.dart'; |
| |
| class C { |
| int? _v; |
| int getterInvocation = 0; |
| int setterInvocation = 0; |
| |
| C(val) { |
| _v = val; |
| } |
| |
| get v { |
| ++getterInvocation; |
| return _v; |
| } |
| |
| set v(val) { |
| ++setterInvocation; |
| _v = val; |
| } |
| } |
| |
| main() { |
| C? c1 = null; |
| var res1 = (c1?.v &= 2); |
| Expect.isNull(res1); |
| Expect.isNull(c1); |
| |
| C c2 = new C(null); |
| Expect.throws(() {c2?.v &= 2;}); /// static type warning |
| |
| C c3 = new C(6); |
| var res3 = (c3?.v &= 4); /// static type warning |
| Expect.equals(1, c3.getterInvocation); |
| Expect.equals(1, c3.setterInvocation); |
| Expect.equals(4, res3); |
| Expect.equals(4, c3.v); |
| } |