public Calculator(string name, int startIdx, int finishIdx, int[] data, Barrier barrier) : base(name)
 {
     _startIdx  = startIdx;
     _finishIdx = finishIdx;
     _data      = data;
     _myMin     = _data [startIdx];
     _myMax     = _data [startIdx];
     _mySum     = 0;
     _barrier   = barrier;
 }