// Offset may vary for different Ts
template <typename T>
std::ptrdiff_t list_node_payload_offset() {
    std::list<T> lst;
    lst.push_back(T{});
    auto lst_begin = lst.begin();
    return reinterpret_cast<uint8_t*>(std::addressof(lst.front())) -
        *reinterpret_cast<uint8_t**>(std::addressof(lst_begin));
}

#pragma GCC optimize "no-strict-aliasing"
template <typename T>
typename std::list<T>::iterator to_list_iterator(T& t) {
    static const auto offset = list_node_payload_offest<T>();
    auto node_address = reinterpret_cast<uint8_t*>(std::addressof(t)) - offset;
    return *reinterpret_cast<typename std::list<T>::iterator*>(&iter_value);
}
#pragma GCC optimize "strict-aliasing"