57 lines
2.0 KiB
C#
57 lines
2.0 KiB
C#
//-----------------------------------------------------------------------
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// <copyright file="ReferenceEqualityComparer.cs" company="Sirenix IVS">
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// Copyright (c) 2018 Sirenix IVS
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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// </copyright>
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//-----------------------------------------------------------------------
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namespace VRC.Udon.Serialization.OdinSerializer.Utilities
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{
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using System;
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using System.Collections.Generic;
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/// <summary>
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/// Compares objects by reference only, ignoring equality operators completely. This is used by the property tree reference dictionaries to keep track of references.
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/// </summary>
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public class ReferenceEqualityComparer<T> : IEqualityComparer<T> where T : class
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{
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/// <summary>
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/// A default, cached instance of this generic variant of the reference equality comparer.
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/// </summary>
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public static readonly ReferenceEqualityComparer<T> Default = new ReferenceEqualityComparer<T>();
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/// <summary>
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/// Returns true if the object references are equal.
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/// </summary>
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public bool Equals(T x, T y)
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{
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return object.ReferenceEquals(x, y);
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}
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/// <summary>
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/// Returns the result of the object's own GetHashCode method.
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/// </summary>
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public int GetHashCode(T obj)
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{
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try
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{
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return obj.GetHashCode();
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}
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catch (NullReferenceException)
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{
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return -1;
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}
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}
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}
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} |