::null

namespace details {

    template<typename Head, typename... Tail>
    void null(Head& head, Tail&... tail) noexcept(noexcept(head = nullptr) && noexcept(null(tail...))) {

        head = nullptr;
        null(tail...);

    }

    template<typename Head>
    void null(Head& head) noexcept(noexcept(head = nullptr)) {
        head = nullptr;
    }

    void null() { }

}

template<typename... Args>
void null(Args&... args) noexcept(noexcept(details::null(args...))) {
    details::null(args...);
}