Language/Generics/syntax_t20.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 A<T> {
  A(this.val);
  T val;
}

typedef AAlias<T> = A<T>;

main() {
  AAlias a1 = new A(12345);
  Expect.isTrue(a1 is A);
  Expect.isTrue(a1 is AAlias);
  Expect.runtimeIsType<A>(a1);
  Expect.runtimeIsType<AAlias>(a1);
  Expect.equals(12345, a1.val);

  AAlias<int> a2 = new A<int>(14);
  Expect.isTrue(a2 is A<int>);
  Expect.isTrue(a2 is AAlias<int>);
  Expect.runtimeIsType<A<int>>(a2);
  Expect.runtimeIsType<AAlias<int>>(a2);
  Expect.equals(14, a2.val);

  AAlias<List<num>> a3 = new A<List<num>>([]);
  Expect.isTrue(a3 is A<List<num>>);
  Expect.isTrue(a3 is AAlias<List<num>>);
  Expect.runtimeIsType<A<List<num>>>(a3);
  Expect.runtimeIsType<AAlias<List<num>>>(a3);
  Expect.listEquals([], a3.val);
}