| // Copyright (c) 2011, 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 an expression of the form --e is equivalent to |
| /// e -= 1. |
| /// @description Checks that evaluation of an expression of the form --e |
| /// results in invoking operator- on the result of e with the proper argument. |
| /// @author rodionov |
| |
| import '../../../Utils/expect.dart'; |
| |
| bool minusInvoked = false; |
| |
| class A { |
| final String? value; |
| |
| A(this.value); |
| |
| operator -(var other) { |
| minusInvoked = true; |
| return new A("${value}-${other}"); |
| } |
| } |
| |
| main() { |
| var foo = new A("foo"); |
| Expect.isFalse(minusInvoked); |
| |
| Expect.equals("foo-1", (--foo).value); |
| Expect.isTrue(minusInvoked); |
| Expect.equals("foo-1", foo.value); |
| } |