blob: cbd3eb1de5e42a820a81dd595256dd7d0c103a80 [file] [log] [blame]
// Copyright (c) 2016, 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 LinkedHashMap({bool equals(K key1, K key2), int hashCode(K key),
/// bool isValidKey(potentialKey)})
/// If [equals] is provided, it is used to compare the keys in the table with new
/// keys. If [equals] is omitted, the key's own [Object.operator==] is used
/// instead. Similar, if [hashCode] is provided, it is used to produce a hash
/// alue for keys in order to place them in the hash table. If it is omitted, the
/// key's own [Object.hashCode] is used.
/// @description Checks that if [equals] and [hashCode] are omitted then
/// [Object.operator==] and [Object.hashCode] are used
/// @author
import "../../../Utils/expect.dart";
import "dart:collection";
class C {
int get hashCode => 1;
bool operator ==(Object c) {
return true;
main() {
LinkedHashMap map1 = new LinkedHashMap(equals: identical,
hashCode: identityHashCode);
LinkedHashMap map2 = new LinkedHashMap();
C key1 = new C();
C key2 = new C();
C key3 = new C();
map1[key1] = 1;
map1[key2] = 2;
map1[key3] = 3;
map2[key1] = 1;
map2[key2] = 2;
map2[key3] = 3;
Expect.equals(3, map1.length);
Expect.equals(1, map2.length);