public ThreadSafeFasterList(FasterList <T> list)
 {
     if (list == null)
     {
         throw new ArgumentException("invalid list");
     }
     _list  = list;
     _lockQ = ReaderWriterLockSlimEx.Create();
 }
 public ThreadSafeFasterList()
 {
     _list  = new FasterList <T>();
     _lockQ = ReaderWriterLockSlimEx.Create();
 }