variadic_args_common_type.cpp

#include <iostream>
#include <string>
#include <array>
#include <type_traits>

using std::cout;
using std::endl;
using std::array;

template<typename... Ts>
constexpr auto make_array(Ts&&... ts)
-> std::array<std::common_type_t<Ts...>,sizeof...(ts)>
{
        return {{ std::forward<Ts>(ts)... }};
}

template<typename... Targs>
void func(const Targs&... args) {
        for (const auto& arg : make_array(args...))
                    cout << arg << " ";
        cout << endl;
}

int main() {
        func("one", "two", "three");
}