Объявить специализацию шаблона класса

// Example program
#include <iostream>
#include <string>
 
constexpr uint8_t config[] = {
        4, 0, 0, 3,
        5, 0, 4, 0, 0, 0,0,0,0,
        7, 0, 5, 0, 0, 0,0,0,0,0,
        9, 0, 2, 0, 0, 0,0
};
 
template<const uint8_t *data, uint16_t size>
struct Pointers2
{
    using Callback = const uint8_t*(*)(uint16_t);
 
    static constexpr const uint8_t* _configuration(uint16_t index)
    {
        const uint8_t *result = data + 4;
        for(uint16_t i = 0; i < index; i++, result += 5 + result[2]);
 
        return result;
    }
    
    template<Callback, typename> struct Data;
    
    template<Callback handler, template<typename, const uint32_t...> class C, const uint32_t ...indexes>
    struct Data<handler, C<uint32_t, indexes...>>
    {
        static constexpr uint16_t SIZE = sizeof...(indexes);
        static constexpr uint8_t const *DATA[] = {handler(indexes)...};
    };
 
    using Configs = Data<&_configuration, tools::MakeIndexSequence<3>>;
};
 
template<const uint8_t *data, uint16_t size>
template<typename Pointers2<data, size>::Callback handler, template<typename, const uint32_t...> class C, const uint32_t ...indexes>
constexpr const uint8_t *Pointers2<data, size>::template Data<handler, C<uint32_t, indexes...>>::DATA[];
 
int main()
{
    using Qqq = Pointers2<config, sizeof(config)>;
    std::cout << static_cast<int>(Qqq::Configs::DATA[0][0]) << ' ' << static_cast<int>(Qqq::Configs::DATA[1][0]) << ' ' << static_cast<int>(Qqq::Configs::DATA[2][0]);
}