1 /* ****************************************************************************
3 * Copyright (c) Microsoft Corporation.
5 * This source code is subject to terms and conditions of the Apache License, Version 2.0. A
6 * copy of the license can be found in the License.html file at the root of this distribution. If
7 * you cannot locate the Apache License, Version 2.0, please send an email to
8 * dlr@microsoft.com. By using this source code in any fashion, you are agreeing to be bound
9 * by the terms of the Apache License, Version 2.0.
11 * You must not remove this notice, or any other, from this software.
14 * ***************************************************************************/
16 using System.Collections.Generic;
18 namespace Microsoft.Scripting.Utils {
19 // Compares two ICollection<T>'s using element equality
20 internal sealed class ListEqualityComparer<T> : EqualityComparer<ICollection<T>> {
21 internal static readonly ListEqualityComparer<T> Instance = new ListEqualityComparer<T>();
23 private ListEqualityComparer() { }
25 // EqualityComparer<T> handles null and object identity for us
26 public override bool Equals(ICollection<T> x, ICollection<T> y) {
27 return x.ListEquals(y);
30 public override int GetHashCode(ICollection<T> obj) {
31 return obj.ListHashCode();