| // 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 Pointer<T> elementAt(int index) |
| /// Pointer arithmetic (takes element size into account). |
| /// This method must be invoked with a compile-time constant T. |
| /// Does not accept dynamic invocations -- where the type of the receiver is |
| /// dynamic. |
| /// |
| /// @description Checks negative argument value |
| /// @author sgrekhov@unipro.ru |
| |
| import "dart:ffi"; |
| import "package:ffi/ffi.dart"; |
| import '../../../Utils/expect.dart'; |
| |
| void main() { |
| Pointer<Int8> p1 = calloc<Int8>(3); |
| try { |
| p1.elementAt(0).value = 42; |
| Pointer<Int8> p2 = new Pointer.fromAddress(p1.elementAt(1).address); |
| Expect.equals(42, p2.elementAt(-1).value); |
| } finally { |
| calloc.free(p1); |
| } |
| } |