tuple_reader

main.cpp

#include <iostream>
#include <tuple>
#include <istream>



template<unsigned Index, unsigned Max, typename Tuple>
struct read_tuple_helper {
	static void read(std::istream& stream, Tuple& tuple) {
		stream >> std::get<Index>(tuple);
		read_tuple_helper<Index + 1, Max, Tuple>::read(stream, tuple);
	}
};

template<unsigned Max, typename Tuple>
struct read_tuple_helper<Max, Max, Tuple>{
	static void read(std::istream& stream, Tuple& tuple) {
		stream >> std::get<Max>(tuple);
	}
};

template<typename...Types>
std::tuple<Types...> read_tuple(std::istream& stream) {
	std::tuple<Types...> tuple;
	read_tuple_helper<0, sizeof...(Types) - 1, std::tuple<Types...>>::read(stream, tuple);
	return tuple;
}

template<>
std::tuple<> read_tuple(std::istream&) = delete;


int main() {
	int i;
	double d;
	std::tie(i, d) = read_tuple<int, double>(std::cin);
}