namespace BigSpace.XRCore.Base
{
    public abstract class Singleton<T> where T : class, new()
    {
        private static readonly object _lock = new object();
        private static T _instance;

        public static T Instance
        {
            get
            {
                if (_instance == null)
                {
                    lock (_lock)
                    {
                        if (_instance == null)
                        {
                            _instance = new T();
                        }
                    }
                }
                return _instance;
            }
        }

        protected Singleton()
        {
            // 防止通过反射创建多个实例
            if (_instance != null)
            {
                throw new System.Exception($"An instance of {typeof(T)} already exists!");
            }
        }
    }
}