using System.Collections;
using UnityEngine;

namespace MyGame {
    public class Singleton<T> : MonoBehaviour where T : class {

        private static T instance = null;

        public static T Instance {
            get {
                if (instance == null)
                    instance = SingletonManager.Go.AddComponent(typeof(T)) as T;
                return instance;
            }
        }

        public static void Instantiate() {
            instance = Instance;
        }

        public Singleton() {
            instance = this as T;
        }
    }

    public class SingletonManager {

        private static GameObject go = null;

        public static GameObject Go {
            get {
                if (go == null) {
                    go = new GameObject("Singleton");
                    Object.DontDestroyOnLoad(go);
                }
                return go;
            }
        }
    }
}