static const data w/ variable len arrays

// in .h file
    struct Product
    {
        int m_price;
        int const * m_availability;
        //.... (more)
    };
    extern const Product product_array[];
    extern const int     product_array_nbr;

// in .cpp file
    const int avail1[] = {1,2,3};
    const int avail2[] = {2, 3, 5, 7, 11, 13};
    const int avail3[] = {42};

    const Product product_array[] =
    {
        {
             23,
             avail1,
             //....(more)
        },
        {
             24,
             avail2,
             //....(more)
        },
        //....(more)
    };

    const int product_array_nbr = sizeof(product_array)/sizeof(product_array[0]);