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;
17 using System.Runtime.CompilerServices;
19 namespace System.Dynamic.Utils {
20 internal sealed class ReferenceEqualityComparer<T> : IEqualityComparer<T> {
21 internal static readonly ReferenceEqualityComparer<T> Instance = new ReferenceEqualityComparer<T>();
23 private ReferenceEqualityComparer() { }
25 public bool Equals(T x, T y) {
26 return object.ReferenceEquals(x, y);
29 public int GetHashCode(T obj) {
30 // CF RH.GetHashCode throws NullReferenceException if the argument is null
31 return obj != null ? RuntimeHelpers.GetHashCode(obj) : 0;