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Operator overloading []

Hi,
in my template matrix class i want to acces the data with the []  operator. The data of the matrix is stored in two QVectors:QVector<QVector<T>> m_data;
I can set the data with
template <typename T> void Matrix<T>::set(const uint &row, const uint &column, const T &value) { m_data[row][column] = value; }
but sometimes it would be nicer to acces the data with the []  operator, like
Matrix<int> mat(3, 3); // 3x3 matrix mat[1][2] = 4;
I've tried to overload the operator, but with no success.
Thanks for help.

Sorry for disturbance, found my mistake. Solution:
template <typename T> QVector<T>& Matrix<T>::operator [](uint index) { return m_data[index]; }