Use variadic template instead of initializer_list to handle movable objects.

make_vector.cc

#include <type_traits>
#include <vector>

template <typename V, typename T1>
inline void back_pusher(V& v, T1 t1)
{
	v.push_back(std::move(t1));
}

template <typename V, typename T1, typename... T2>
inline void back_pusher(V& v, T1 t1, T2... t2)
{
	v.push_back(std::move(t1));
	back_pusher(v, std::move(t2)...);
}

template <typename... T>
inline auto make_vector(T... t)
	-> std::vector<std::common_type_t<T...>>
{
	std::vector<std::common_type_t<T...>> v;
	v.reserve(sizeof...(T));
	back_pusher(v, std::move(t)...);
	return v;
}

#include <iostream>
#include <string>

int main()
{
	std::string s;
	std::cin >> s;
	auto v = make_vector("rvalue", s);
	std::cout << v[1] << std::endl;
}