unity 标准单例类 MonoSingleton<T>

using UnityEngine;

public class MonoSingleton<T> : MonoBehaviour where T : MonoSingleton<T>
{
    private static T _instance;
    private static readonly object _lock = new object();
    private static bool _applicationIsQuitting = false;

    public static T Instance
    {
        get
        {
            if (_applicationIsQuitting) return null;

            lock (_lock)
            {
                if (_instance == null)
                {
                    _instance = FindObjectOfType<T>();

                    if (_instance == null)
                    {
                        GameObject singletonObject = new GameObject();
                        _instance = singletonObject.AddComponent<T>();
                        singletonObject.name = typeof(T).ToString() + " (Singleton)";

                        DontDestroyOnLoad(singletonObject);

                        Debug.Log($"An instance of {typeof(T).ToString()} is needed in the sc
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