#include <iostream>
#include <vector>
#include <array>
#include <functional>
#include <string>
#include <any>

// dummy
template<typename T>
T GetValueByKey(const char* key)
{
    return T(0);
}
template<>
int GetValueByKey(const char* key)
{
    return 10;
}
template<>
long GetValueByKey(const char* key)
{
    return 15L;
}
template<>
std::string GetValueByKey(const char* key)
{
    return "aaa";
}

template <size_t Idx, typename ... JoinType>
void FindJoinValue(std::tuple<JoinType...> &res, const std::array<const char *, sizeof ... (JoinType)> &keys)
{
    constexpr size_t VarSize = sizeof ... (JoinType);

    using KeyType = std::remove_cv_t<std::remove_reference_t<decltype(std::get<Idx>(res))>>;
    KeyType x = GetValueByKey<KeyType>(keys[Idx]);
    std::get<Idx>(res) = x;

    if constexpr (Idx != 0)
        FindJoinValue<Idx - 1, JoinType...>(res, keys);
}

template <typename ... JoinType>
void FindJoinValue(const std::array<const char *, sizeof ... (JoinType)> &keys/*, std::function<bool(std::tuple<JoinType...>)> c*/)
{
    constexpr size_t VarSize = sizeof ... (JoinType);

    std::tuple<JoinType...> res;

    FindJoinValue<VarSize - 1, JoinType...>(res, keys);

    //c(res);
}

int main(int argc, char** argv)
{
    std::array<const char*, 3> arr{ "Hey", "Hi", "Hello" };

    FindJoinValue<int, long, std::string>(arr);

    return 0;
}