// In cpp file
// 1)

template <class T>
Matrix<T> Matrix<T>::operator[](const int r)
{
    Matrix newMatrix(1,cols);

    for (unsigned int k = 0;k<cols;k++)
    {
        newMatrix.matrix[0][k] = matrix[r][k];
    }

    return newMatrix;
}

// in .h file
// 2)
    friend ostream& operator << (ostream & output, Matrix<T>& o)
    {
        for (unsigned int x = 0;x<o.rows;x++)
        {
            for (unsigned int y = 0;y<o.cols;y++)
            {
                output << o.matrix[x][y];

                if (y != (o.cols-1))
                {
                    output << " ";
                }
            }

            output << endl;
        }

        return output;
    }

// 3)
 Matrix operator[](const int r);