Question

I’m building a Matrix class for all the operations such as addition, subtraction, multiplication, inverse etc. I have overloaded simple operators such as + - () *. But I’m trying to set a row and column value via ().

A sample would be like so

Matrix(1,1) = 10;

assuming that row 1, column 1 would be set to 10.

A sample of my addition overload is this

friend Matrix operator +(Matrix&, Matrix&);

How can I achieve this?

Thanks!

Answer 1

Your matrix should provide element accessors, e.g. via operator():

template <typename T>
class Matrix
{
public:
    T & operator()(size_t i, size_t j) { return buf[i * NCols + j]; } // Example
    T const & operator()(size_t i, size_t j) const { /* same */ }

    // ...
};

Then you can say:

Matrix<bool> m(20, 20);

m(12, 15) = false;
m(8, 19) = m(1, 2) = true;
return m(0, 0);