Language/Generics/syntax_t22.dart

// 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 class declaration, type alias, or function [G] may be generic,
/// that is, [G] may have formal type parameters declared.
/// @description @description Checks various correct type alias declarations.
/// @author iarkh@unipro.ru

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

class B<T1, T2> {
  B(this.x, this.y) {}
  T1 x;
  T2 y;
}

typedef BAlias<T1, T2> = B<T1, T2>;

main() {
  BAlias b1 = new B(1, 2);
  Expect.isTrue(b1 is B);
  Expect.isTrue(b1 is BAlias);
  Expect.runtimeIsType<B>(b1);
  Expect.runtimeIsType<BAlias>(b1);
  Expect.equals(1, b1.x);
  Expect.equals(2, b1.y);

  BAlias<int, String> b2 = new B<int, String>(0, "testme");
  Expect.isTrue(b2 is B<int, String>);
  Expect.isTrue(b2 is BAlias<int, String>);
  Expect.runtimeIsType<B<int, String>>(b2);
  Expect.runtimeIsType<BAlias<int, String>>(b2);
  Expect.equals(0, b2.x);
  Expect.equals("testme", b2.y);
}