// metatype interface for composite QML types
struct QQmlMetaTypeInterface : QtPrivate::QMetaTypeInterface
{
    QByteArray name;
    QQmlMetaTypeInterface(QByteArray name)
        : QMetaTypeInterface {
            /*.revision=*/ QMetaTypeInterface::CurrentRevision,
            /*.alignment=*/ alignof(QObject *),
            /*.size=*/ sizeof(QObject *),
            /*.flags=*/ QtPrivate::QMetaTypeForType<QObject *>::flags(),
            /*.typeId=*/ 0,
            /*.metaObjectFn=*/ &dynamicQmlMetaObject,

            /*.name=*/ name.constData(),             // HERE

            /*.defaultCtr=*/ [](const QMetaTypeInterface *, void *addr) {
                *static_cast<QObject **>(addr) = nullptr;
            },
            /*.copyCtr=*/ [](const QMetaTypeInterface *, void *addr, const void *other) {
                *static_cast<QObject **>(addr) = *static_cast<QObject *const *>(other);
            },
            /*.moveCtr=*/ [](const QMetaTypeInterface *, void *addr, void *other) {
                *static_cast<QObject **>(addr) = *static_cast<QObject **>(other);
            },
            /*.dtor=*/ [](const QMetaTypeInterface *, void *) {},
            /*.equals*/ nullptr,
            /*.lessThan*/ nullptr,
            /*.debugStream=*/ nullptr,
            /*.dataStreamOut=*/ nullptr,
            /*.dataStreamIn=*/ nullptr,
            /*.legacyRegisterOp=*/ nullptr
        }
        , name(std::move(name)) { }
};