| /* |
| * Copyright (c) 2019, 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 A simple member invocation on a target expression X is an |
| * expression of one of the forms: |
| * Member invocation on target X Corresponding member name |
| * X[expr1]++, X[expr1]--, ++X[expr1], --X[expr1] [] |
| * @description Check explicit extension member invocation in form of X[expr1]++ |
| * @issue 39198 |
| * @author sgrekhov@unipro.ru |
| */ |
| // SharedOptions=--enable-experiment=extension-methods |
| import "../../Utils/expect.dart"; |
| |
| class C { |
| int value; |
| C() : value = 0 {} |
| init() { |
| value = 0; |
| } |
| C operator [](int index) { |
| this.value += index; |
| return this; |
| } |
| void operator []=(int index, C other) { |
| this.value += other.value + index; |
| } |
| C operator +(int val) { |
| this.value += val; |
| return this; |
| } |
| } |
| |
| extension Extension1 on C { |
| C operator [](int index) { |
| this.value += index + 1; |
| return this; |
| } |
| void operator []=(int index, C other) { |
| this.value += other.value + index + 1; |
| } |
| C operator +(int val) { |
| Expect.fail("Extension1 + operator mustn't be called"); |
| return this; |
| } |
| } |
| |
| extension Extension2 on C { |
| C operator [](int index) { |
| this.value += index + 2; |
| return this; |
| } |
| void operator []=(int index, C other) { |
| this.value += other.value + index + 2; |
| } |
| C operator +(int val) { |
| Expect.fail("Extension2 + operator mustn't be called"); |
| return this; |
| } |
| } |
| |
| main() { |
| C c = C(); |
| Extension1(c)[42]++; |
| Expect.equals(131, c.value); |
| |
| c.init(); |
| Extension2(c)[42]++; |
| Expect.equals(134, c.value); |
| |
| c.init(); |
| c[42]++; |
| Expect.equals(128, c.value); |
| } |