Programming-Design-Patterns-And-Principles/Assets/Patterns_And_Principles/Patterns/The Singleton Pattern/MonoSingleton/Script/MonoSingleton.cs

using UnityEngine;

namespace Patterns_And_Principles.Patterns.The_Singleton_Pattern.MonoSingleton.Script
{
    public abstract class MonoSingleton<T> : MonoBehaviour where T : MonoSingleton<T>
    {
        public static T Instance { get; private set; }

        protected virtual void Awake()
        {
            if (Instance != null && Instance != this)
            {
                Destroy(gameObject);
                return;
            }

            Instance = (T)this;
            DontDestroyOnLoad(gameObject);
        }
    }
}