MonoSingleton.cs

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using UnityEngine;
 
namespace WKLib.Core.Classes;
 
[DefaultExecutionOrder(-200)]
internal abstract class MonoSingleton : MonoBehaviour { }
 
internal abstract class MonoSingleton<T> : MonoSingleton where T : MonoSingleton<T>
{
    private static T instance = null;
 
    public static T Instance
    {
        get => instance;
        set => instance = value;
    }
 
    public virtual void Awake()
    {
        if (Instance && Instance != this)
        {
            Destroy(this);
        }
        else
        {
            Instance = (T)this;
        }
    }
 
    public virtual void OnEnable()
    {
        Instance = (T)this;
    }
}