vector와 가변템플릿에 대해서 질문하나 하겠습니다.

template < class... T >
int f1(int(*f2)(T...), T... v)
{
	return f2(v...);
}

template<typename Tuple, size_t size = std::tuple_size<Tuple>::value>
struct Helper
{
	static void set(Tuple& result, std::vector<void*> const& vec)
	{
		typedef typename std::tuple_element<size - 1, Tuple>::type Element;
		std::get<size - 1>(result) = *static_cast<Element*>(vec[size - 1]);
		Helper<Tuple, size - 1>::set(result, vec);
	}
};
 
template<typename Tuple>
struct Helper<Tuple, 0>
{
	static void set(Tuple& result, std::vector<void*> const& vec)
	{}
};
 
template < class... T >
int f1(int(*f2)(std::tuple<T...> const&), std::vector<void*> const& v)
{
	std::tuple<T...> params;
	Helper<decltype(params)>::set(params, v);
	return f2(params);
}

template<typename... T>
struct Helper
{
	typedef std::tuple<T...> Params;
 
	static int call(int(*f2)(T...), std::vector<void*> const& v)
	{
		return callImpl(f2, v, std::integral_constant<size_t, sizeof...(T)>());
	}
 
	static int callImpl(int(*f2)(T...), std::vector<void*> const& v, std::integral_constant<size_t, 0>)
	{
		return f2();
	}
 
	static int callImpl(int(*f2)(T...), std::vector<void*> const& v, std::integral_constant<size_t, 1>)
	{
		return f2(*static_cast<typename std::tuple_element<0, Params>::type*>(v[0]));
	}
 
	static int callImpl(int(*f2)(T...), std::vector<void*> const& v, std::integral_constant<size_t, 2>)
	{
		return f2(*static_cast<typename std::tuple_element<0, Params>::type*>(v[0])
				, *static_cast<typename std::tuple_element<1, Params>::type*>(v[1]));
	}
 
	static int callImpl(int(*f2)(T...), std::vector<void*> const& v, std::integral_constant<size_t, 3>)
	{
		return f2(*static_cast<typename std::tuple_element<0, Params>::type*>(v[0])
				, *static_cast<typename std::tuple_element<1, Params>::type*>(v[1])
				, *static_cast<typename std::tuple_element<2, Params>::type*>(v[2]));
	}
 
	// 이 후 가능한 파라미터 수에 따라 모두 작성해 주어야 합니다.
};
 
template < class... T >
int f1(int(*f2)(T...), std::vector<void*> const& v)
{
	return Helper<T...>::call(f2, v);
}