Language/Expressions/Object_Identity/constant_maps_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 The predefined Dart function identical() is defined such that
 * identical(c1, c2) iff:
 *  • c1 and c2 are constant maps that are defined to be identical in the
 *    specification of literal map expressions.
 * @description Checks that constatnt maps are identical() if they have both
 * identical types and content.
 * @author kaigorodov
 */
import "../../../Utils/expect.dart";

const nums1 = const <num, String>{};
const nums2 = const <num, String>{};
const ints1 = const <int, String>{};
const ints2 = const <int, String>{};
const doubles1 = const <double, String>{};
const doubles2 = const <double, String>{};

main() {
  Expect.isTrue(identical(nums1, nums2));
  Expect.isTrue(identical(ints1, ints2));
  Expect.isTrue(identical(doubles1, doubles2));

  Expect.isFalse(identical(nums1, ints1));
  Expect.isFalse(identical(nums1, doubles1));
  Expect.isFalse(identical(ints1, doubles1));
}