Error in QML: Unknown method return type: Organisation::ICar*. Using Q_DECLARE_METATYPE and qmlRegisterType

Please go through my code.

My interface:

namespace Organisation
{

class ICar
{
// ---pure virtual functions---
};

}

Q_DECLARE_INTERFACE(Organisation::ICar, "com.organisation.ICar/1.0")


My Derived class:

class Toyota: public QObject, public virtual Organisation::ICar
{
Q_OBJECT
Q_INTERFACES(Organisation::ICar)

// ---All implementations---
}


In the constructor I register the type to QML using

qmlRegisterType<Toyota>("organisation.com.Toyota", 1, 0, "Toyota");


Above one compiles fine, but give error in QML (Unknown method return type error)

qmlRegisterType<Organisation::ICar>("organisation.com.Toyota", 1, 0, "Toyota");
qmlRegisterType<Organisation::ICar>("organisation.com.IToyota", 1, 0, "Toyota"); */


Above two gives

error: C2039: 'staticMetaObject': is not a member of 'Organisation::ICar'

Gets same error if I give

Q_DECLARE_METATYPE(QQmlListProperty<Organisation::ICar>)


or

Q_DECLARE_METATYPE(Organisation::ICar>)


in the header file. It is outside all classes and namespaces

Another class called UsedCars creates objects of Toyota and supplies to other modules as Organisation::ICar pointers.

UsedCars

Toyota

Organisation::ICar

ICar, Toyota, UsedCars, etc. are part of a library named UsedCars.

ICar

Toyota

UsedCars

UsedCars

Another module called Dealership uses the UsedCars library.
Dealership creates cars and stores it as Organisation::ICar pointers.

Dealership

UsedCars

Dealership

Organisation::ICar

These pointers are stored in a QList<Organisation::ICar *>.

QList<Organisation::ICar *>

In the dealership class there is a read function that returns these cars pointers used by Q_PROPERTY defined in the header

Q_PROPERTY

Q_PROPERTY(QQmlListProperty<Organisation::ICar> carList READ carList)


function to return carList:

QQmlListProperty<Organisation::ICar> Dealership::carList()
{
return QQmlListProperty<Organisation::ICar>(this, this->carStockList());
}


carStockList() returns the QList of pointers of type Organisation::ICar*

carStockList()

QList

Organisation::ICar*

QList<Organisation::ICar *> carStockList // list returned by carStockList()


When I use the carList propery in QML and it gives error:

carList

Unknown method return type: Organisation::ICar*

QML is getting the Organisation::ICar pointers but is unknown.
I want to access the data of the Car objects each Organisation::ICar* pointer is pointing to.

Organisation::ICar

Car

Organisation::ICar*

I have given

Q_DECLARE_METATYPE(QQmlListProperty<Organisation::ICar>)


in the dealership class header outside the class.

I think the above statement is needed, otherwise QML does not even get Organisation::ICar* pointer.

Organisation::ICar*

Sorry for the long post. I have been searching for a solution for 2 days, got some suggestions and reached this far.

I feel like there is some issue where with the type registration or the pointer type used with QQmlListProperty.

QQmlListProperty

Any suggestions on what I am doing wrong?

public virutal Organisation::ICar

public virtual Organisation::ICar

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