using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using System.Reflection;

namespace WildAttack
{
    /// <summary>
    /// 单例基类
    /// </summary>
    /// <typeparam name="T"></typeparam>
    public class Singleton<T> : ISingletonExpand where T : Singleton<T>, new()
    {
        private static T instance;
        public static T GetInstance()
        {
            if (instance == null)
            {
                instance = new T();
                SingletonManager.singletons.Add(instance);
            }
            return instance;
        }
        public void ClearSingleton() 
        {
            if (instance == this) 
            {
                instance = null;
            }
        }
    }
    public interface ISingletonExpand
    {
        void ClearSingleton();
    }
    public class SingletonManager
    {
        public static HashSet<ISingletonExpand> singletons = new();
        public static void Clear() 
        {
            foreach (var item in singletons)
            {
                item.ClearSingleton();
            }
            singletons.Clear();
        }
    }
}