qt - Behaviour of QMetaObject within a base class constructor -

i have simple qobject-derived object:

class myobject : public qobject { q_object public:     myobject(qobject* parent = 0); };  myobject::myobject(qobject* parent) : qobject(parent) {     std::cout<<"[base] "<<this->metaobject()->classname()<<std::endl; } 

and further derive object:

class myderivedobject : public myobject { q_object public:     myderivedobject(qobject* parent); };  myderivedobject::myderivedobject(qobject* parent) : myobject(parent) {     std::cout<<"[derived] "<<this->metaobject()->classname()<<std::endl; } 

whenever instantiate class, following output:

myderivedobject y;  ## output ### [base] myobject [derived] myderivedobject 

i don't it. since inheritance hierarchy myderivedobject -> myobject -> qobject, both have same instance of qobject parent (right?). know of run-time type information provided via moc, shouldn't change fact once static_cast<qobject*>(/*mysomeobject*/) on pointer 1 of objects, same thing (even in memory) long qobject functionality concerned. why different return values of classname()? either ways, how obtain name of type qobject of?

i not sure details each qobject-derived class has own copy of meta object structure:

myderivedobject y;  qdebug() << (void*) y.metaobject(); qdebug() << (void*) y.myobject::metaobject(); 

that gets 2 different pointers meta object.

edit: not sure second question is. if want know if qobject derived given class name, use qobject::inherits() find out.