main.cpp Example File

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 #include <QCoreApplication>
 #include <QQmlEngine>
 #include <QQmlComponent>
 #include <QDebug>
 #include "birthdayparty.h"
 #include "person.h"

 int main(int argc, char ** argv)
 {
     QCoreApplication app(argc, argv);

     qmlRegisterType<BirthdayParty>("People", 1,0, "BirthdayParty");
     qmlRegisterType<ShoeDescription>();
     qmlRegisterType<Person>();
     qmlRegisterType<Boy>("People", 1,0, "Boy");
     qmlRegisterType<Girl>("People", 1,0, "Girl");

     QQmlEngine engine;
     QQmlComponent component(&engine, QUrl("qrc:example.qml"));
     BirthdayParty *party = qobject_cast<BirthdayParty *>(component.create());

     if (party && party->host()) {
         qWarning() << party->host()->name() << "is having a birthday!";

         if (qobject_cast<Boy *>(party->host()))
             qWarning() << "He is inviting:";
         else
             qWarning() << "She is inviting:";

         Person *bestShoe = nullptr;
         for (int ii = 0; ii < party->guestCount(); ++ii) {
             Person *guest = party->guest(ii);
             qWarning() << "   " << guest->name();

             if (!bestShoe || bestShoe->shoe()->price() < guest->shoe()->price())
                 bestShoe = guest;
         }
         if (bestShoe)
             qWarning() << bestShoe->name() << "is wearing the best shoes!";

     } else {
         qWarning() << component.errors();
     }

     return 0;
 }