struct a
{
    static std::string name() {return "a";}
};

struct b
{
    static std::string name() {return "b";}
};

struct c
{
    static std::string name() {return "c";}
};

template<typename _T>
std::string get_name()
{
    return _T::name();
}

template<typename _T, typename... _tail>
std::string get_name()
{
    return _T::name() + " " + get_name<_tail ...>();
}

int main()
{
    std::cout << get_name<a, b, c, a>();
}