CODE EXAMPLE FOR CPP

how to modify 2d array in function c++

class Array2D
{
private:
    int* m_array;
    int m_sizeX;
    int m_sizeY;

public:
    Array2D(int sizeX, int sizeY) : m_sizeX(sizeX), m_sizeY(sizeY)
    {
        m_array = new int[sizeX*sizeY];
    }

    ~Array2D()
    {
        delete[] m_array;
    }

    int & at(int x, int y)
    {
        return m_array[y*sizeX + x];
    }
};