67 lines
2.6 KiB
C#
67 lines
2.6 KiB
C#
//-----------------------------------------------------------------------
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// <copyright file="UnityExtensions.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.Reflection;
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/// <summary>
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/// Extends various Unity classes.
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/// </summary>
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public static class UnityExtensions
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{
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private static readonly ValueGetter<UnityEngine.Object, IntPtr> UnityObjectCachedPtrFieldGetter;
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static UnityExtensions()
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{
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var field = typeof(UnityEngine.Object).GetField("m_CachedPtr", BindingFlags.Public | BindingFlags.NonPublic | BindingFlags.Instance);
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if (field != null)
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{
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UnityObjectCachedPtrFieldGetter = EmitUtilities.CreateInstanceFieldGetter<UnityEngine.Object, IntPtr>(field);
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}
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}
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/// <summary>
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/// Determines whether a Unity object is null or "fake null",
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/// without ever calling Unity's own equality operators.
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/// This method is useful for checking if a Unity object is
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/// null, destroyed or missing at times when it is not allowed
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/// to call Unity's own equality operators, for example when
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/// not running on the main thread.
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/// </summary>
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/// <param name="obj">The Unity object to check.</param>
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/// <returns>True if the object is null, missing or destroyed; otherwise false.</returns>
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public static bool SafeIsUnityNull(this UnityEngine.Object obj)
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{
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if (object.ReferenceEquals(obj, null))
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{
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return true;
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}
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if (UnityObjectCachedPtrFieldGetter == null)
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{
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throw new NotSupportedException("Could not find the field 'm_CachedPtr' in the class UnityEngine.Object; cannot perform a special null check.");
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}
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IntPtr ptr = UnityObjectCachedPtrFieldGetter(ref obj);
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return ptr == IntPtr.Zero;
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}
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}
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} |