Test & operator = (const Test& other)
    {
        if(this != & other)
        {
            if(other.dataRowsLength > 0)
            {
                DataTable* newRows = new DataTable[other.dataRowsLength];
                copy(other.dataRows, other.dataRows + other.dataRowsLength, newRows);

                delete[] dataRows;

                dataRowsLength = other.dataRowsLength;
                dataRows = newRows;
            }
            else
            {
                delete[] dataRows;
            }
        }
        return * this;
    }