如何创建一个空的 std::tuple？

Question

我需要构造一个std::tuple对象，以便std::tuple_size<T>::value = 0。有没有办法做到这一点？

Answer 1

std::tuple<> empty;
using empty_t = std::tuple<>;
auto empty2 = std::make_tuple();
static_assert(std::tuple_size<std::tuple<>>::value == 0);