public void *GetUnsafePtr()
 {
     return(_slice.GetUnsafePtr());
 }
 /// <summary>
 /// specialize for NativeJaggedArraySlice<T>
 /// </summary>
 /// <param name="slice"></param>
 public unsafe void Add(NativeJaggedArraySlice <T> slice)
 {
     this.Add((T *)slice.GetUnsafePtr(), slice.Length);
 }