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//-----------------------------------------------------------------------
// <copyright file="UnityExtensions.cs" company="Sirenix IVS">
// Copyright (c) 2018 Sirenix IVS
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// </copyright>
//-----------------------------------------------------------------------
namespace VRC.Udon.Serialization.OdinSerializer.Utilities
{
using System;
using System.Reflection;
/// <summary>
/// Extends various Unity classes.
/// </summary>
public static class UnityExtensions
{
private static readonly ValueGetter<UnityEngine.Object, IntPtr> UnityObjectCachedPtrFieldGetter;
static UnityExtensions()
{
var field = typeof(UnityEngine.Object).GetField("m_CachedPtr", BindingFlags.Public | BindingFlags.NonPublic | BindingFlags.Instance);
if (field != null)
{
UnityObjectCachedPtrFieldGetter = EmitUtilities.CreateInstanceFieldGetter<UnityEngine.Object, IntPtr>(field);
}
}
/// <summary>
/// Determines whether a Unity object is null or "fake null",
/// without ever calling Unity's own equality operators.
/// This method is useful for checking if a Unity object is
/// null, destroyed or missing at times when it is not allowed
/// to call Unity's own equality operators, for example when
/// not running on the main thread.
/// </summary>
/// <param name="obj">The Unity object to check.</param>
/// <returns>True if the object is null, missing or destroyed; otherwise false.</returns>
public static bool SafeIsUnityNull(this UnityEngine.Object obj)
{
if (object.ReferenceEquals(obj, null))
{
return true;
}
if (UnityObjectCachedPtrFieldGetter == null)
{
throw new NotSupportedException("Could not find the field 'm_CachedPtr' in the class UnityEngine.Object; cannot perform a special null check.");
}
IntPtr ptr = UnityObjectCachedPtrFieldGetter(ref obj);
return ptr == IntPtr.Zero;
}
}
}
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