DBUS_DEBUG( "registering interface %p (%d)", v, fallback ? 1 : 0 );
destructors.push_back([=]() {
DBUS_DEBUG( "unregistering interface %p", v );
DBUS_DEBUG( "registering interface %p (%d)", v, fallback ? 1 : 0 );
destructors.push_back([=]() {
DBUS_DEBUG( "unregistering interface %p", v );