array2d_access.cpp

struct Array1D
{
   float vals[WIDTH];

   float& operator[] (int index)
   {
       return vals[index];
   }
};

struct Array2D
{
   Array1D rows[HEIGHT];

   Array1D& operator[] (int index)
   {
       return rows[index];
   }
};

struct Array
{
    struct Index
    {
        int x, y;
    };

    float vals[WIDTH * HEIGHT];

    float& operator[] (Index index)
    {
        return vals[index.y * WIDTH + index.x];
    }
};