blob: 5ef84f00796f1b747260ec86832177b60461f939 [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 bool contains(Object element)
/// Some types of iterable may have a different equality used for its elements.
/// For example, a [Set] may have a custom equality (see [Set.identical]) that
/// its [contains] uses. Likewise the [Iterable] returned by a [Map.keys] call
/// should use the same equality that the [Map] uses for keys.
/// @description Checks that [true] is returned if operator == always returns
/// [true] and [false] is returned otherwise for set.
/// @author
import "../../../Utils/expect.dart";
import "dart:collection";
class MyIterable extends Object with IterableMixin {
Set _content;
MyIterable(Set set): _content = set;
Iterator get iterator {
return _content.iterator;
class C1 {
int get hashCode => 1;
bool operator == (dynamic c) { return true; }
class C2 {
int get hashCode => 1;
bool operator == (dynamic c) { return false; }
main() {
HashSet set = new HashSet<C1>();
set.add(new C1());
MyIterable iterable = new MyIterable(set);
Expect.isTrue(iterable.contains(new C1()));
Expect.isTrue(iterable.contains(new C2()));
set = new HashSet<C2>();
set.add(new C2());
iterable = new MyIterable(set);
Expect.isFalse(iterable.contains(new C2()));
Expect.isFalse(iterable.contains(new C1()));