[Unity] Generic Singleton

public abstract class GenericSingleTon<T> : MonoBehaviour where T : MonoBehaviour
{
    private static T _instance;
    public static T instance
    {
        get
        {
            if (_instance == null)
            {
                T[] objectList = Resources.FindObjectsOfTypeAll<T>();
                if (objectList.Length > 0)
                    (objectList[0] as GenericSingleTon<T>).Awake();
            }
            return _instance;
        }
    }

    private void Awake()
    {
        if (_instance == null)
            _instance = this as T;
    }
}