Registering QMetaType not working

goocreations

I'm using Qt 5.0.0 and have problems registering my own class as a QMetaType. I'm not sure if this is a bug, since they've change a lot in QMetaType. I have the following structure:

@class Base : public QObject, public OtherClass
{
Q_OBJECT

public:
    Base();
    Base(const Base &other);
    virtual ~Base();

};

class Subclass : public Base
{
Q_OBJECT

public:
    Subclass();
    Subclass(const Subclass &other)
    ~Subclass();

};

Q_DECLARE_METATYPE(Subclass);@

Whenever I try to retrieve the type with QMetaType::type("Subclass"), it returns 0 (MetaType::UnknownType). Does anyone have an idea what I'm doing wrong? Or is this a bug?

SGaist

Hi,

You can't have a QObject as meta type because copying QObject is forbidden (in fact, the copy constructor is disabled).
You might get away using a pointer meta type.

Do your classes really need to be QObjects ?

goocreations

No, originally I didn't inherit from QObject. But it didn't work, so I thought that QObject might fix the problem. So even with this structure, it is not working (OtherClass is a simple class inheriting from nothing):

@ class Base : public OtherClass
{

    public:
        Base();
        Base(const Base &other);
        virtual ~Base();
};
 
class Subclass : public Base
{
   
    public:
        Subclass();
        Subclass(const Subclass &other)
        ~Subclass();
};
 
Q_DECLARE_METATYPE(Subclass);

@

SGaist

In that case, did you a

@qRegisterMetaType<Subclass>();@

somewhere ?

goocreations

That always worked in Qt4, but in Qt5 I get the following error:

@error: specializing member ‘::qRegisterMetaType<Subclass>’ requires ‘template<>’ syntax@

qRegisterMetaType<Subclass>("Subclass") also doesn't work