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// 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 All field declarations in a Union subclass declaration must
/// either have type int or float and be annotated with a NativeType
/// representing the native type, or must be of type Pointer or subtype of
/// Struct or Union.
/// @description Checks that it is not an error if all of the field in Union
/// subclass are 'int', 'double', 'Pointer' or subtype of Struct or Union
/// @author
/// @issue 46194
import "dart:ffi";
import "package:ffi/ffi.dart";
import "../../../Utils/expect.dart";
class U extends Union {
external int x;
class S extends Struct {
external int y;
class U1 extends Union {
external int i;
external double d;
external Pointer<Int16> p;
external S s;
external U u;
void main() {
Pointer<U1> p = calloc<U1>();
U1 u1 = p.ref;
u1.u.x = 42;
Expect.equals(42, u1.u.x);
u1.s.y = -42;
Expect.equals(-42, u1.s.y);
u1.i = 1;
Expect.equals(1, u1.i);
u1.d = 3.14;
Expect.approxEquals(3.14, u1.d);
u1.p = calloc<Int16>();
u1.p.value = 13;
Expect.equals(13, u1.p.value);