| // Copyright (c) 2021, 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 Field declarations in a Union subclass declaration are |
| /// automatically given a setter and getter implementation which accesses the |
| /// native union's field in memory. |
| /// |
| /// @description Checks that fields in a Union subclass shares the same memory |
| /// @author sgrekhov@unipro.ru |
| |
| import "dart:ffi"; |
| import "package:ffi/ffi.dart"; |
| import "../../../Utils/expect.dart"; |
| |
| class U extends Union { |
| @Int32() |
| external int x; |
| |
| @Int16() |
| external int y; |
| } |
| |
| void main() { |
| Pointer<U> p = calloc<U>(); |
| try { |
| U u = p.ref; |
| u.y = -42; |
| u.x = 42; |
| Expect.equals(42, u.x); |
| Expect.equals(42, u.y); |
| |
| u.x = 1; |
| u.y = 2; |
| Expect.equals(2, u.x); |
| Expect.equals(2, u.y); |
| |
| u.x = 65537; |
| Expect.equals(65537, u.x); |
| Expect.equals(1, u.y); |
| |
| u.x = 65538; |
| Expect.equals(65538, u.x); |
| Expect.equals(2, u.y); |
| |
| u.y = 2; |
| Expect.equals(65538, u.x); |
| Expect.equals(2, u.y); |
| } finally { |
| calloc.free(p); |
| } |
| } |