Method clear_all_user_data

src/core/impl/utils/metahelper.cpp:13–16

UserDataContainer::~UserDataContainer() noexcept = default;

void UserDataContainer::clear_all_user_data() {
    m_refkeeper.clear();
    m_storage.clear();
}

void UserDataContainer::do_add(Typeinfo* type, std::shared_ptr<UserData> data) {
    auto ins = m_refkeeper.emplace(std::move(data));