Converting errno to exception

gistfile1.txt

#include <cerrno>
#include <system_error>
#include <type_traits>

void check_errno() {
	const auto e = errno;
	if (e) {
		errno = 0;
		throw std::system_error(e, std::system_category());
	}
}

template <typename Function, typename ... Args>
auto call_system(Function function, Args ... args) -> typename std::result_of<Function(Args ...)>::type {
	const auto ret = function(args ...);
	check_errno();
	return ret;
}