Language/Classes/Superinterfaces/syntax_t01.dart

// 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 A class has a set of direct superinterfaces. This set includes
/// the interface of its superclass and the interfaces specified in the
/// implements clause of the class.
/// interfaces:
///   implements typeList
/// ;
/// @description Checks that a class can indeed specify one or more
/// superinterfaces using the implements clause and an instance of this class
/// will also be an instance of those interfaces as well as any and all of its
/// superclasses' superinterfaces.
/// @author pagolubev

import "../../../Utils/expect.dart";

abstract class IA {}
class A implements IA {}
abstract class IB {}
class B extends A implements IB {}
abstract class IC {}
abstract class ID {}
class C extends B implements IC, ID {}

main() {
  C c = new C();
  Expect.isTrue(c is IA);
  Expect.isTrue(c is IB);
  Expect.isTrue(c is IC);
  Expect.isTrue(c is ID);
  Expect.runtimeIsType<IA>(c);
  Expect.runtimeIsType<IB>(c);
  Expect.runtimeIsType<IC>(c);
  Expect.runtimeIsType<ID>(c);
}