magic-cpp.cpp

#include <tuple>
#include <typeinfo>
#include <type_traits>
#include <iostream>

template <typename F>
struct make_tuple_of_params;

template <typename Ret, typename... Args>
struct make_tuple_of_params<Ret(*)(Args...)>
{
	using type = std::tuple<Args...>;
};

template <typename F>
using make_tuple_of_params_t = typename make_tuple_of_params<F>::type;

template <typename F, typename Tuple, std::size_t... I>
void dispatch_to_c(F f, Tuple & t, std::index_sequence<I...>)
{
	f(std::get<I>(t)...);
}

template <typename F, typename P>
void magic_wand(F f, P& p)
{
	static constexpr auto t_count = std::tuple_size<P>::value;
	dispatch_to_c(f,p, std::make_index_sequence<t_count>());
}

bool test_func(int in1, float in2, int* out1, float* out2)
{
	*out1 = in1;
	*out2 = in2;
	return true;
}

int main(int argc, char** argv)
{
	int o1;
	float o2;

	magic_wand(test_func, std::make_tuple(1,2.0f,&o1,&o2));
	std::cout << o1 << "\n" << o2 << "\n";
}