How to verify QVariant of type QVariant::UserType is expected type?

Question

I\'m writing testing code that will automatically iterate thru all Q_PROPERTY\'s of widgets and some properties are using types that are registered via qRegisterMetaType. If

Answer 1

For user defined types there is QVariant::userType(). It works like QVariant::type() but returns the type id integer of the user defined type whereas QVariant::type() always return QVariant::UserType.

There is also QVariant::typeName() which returns the name of the type as a string.

EDIT :

It probably depends on how you set the QVariant. Directly using QVariant::QVariant(int type, const void * copy) is discouraged.

Say I have three types like this :

class MyFirstType
{ 
    public:
        MyFirstType();
        MyFirstType(const MyFirstType &other);
        ~MyFirstType();

        MyFirstType(const QString &content);

        QString content() const;

    private:
        QString m_content;
};
Q_DECLARE_METATYPE(MyFirstType);

The third without Q_DECLARE_METATYPE

I store them in QVariant :

 QString content = "Test";

 MyFirstType first(content);

 MySecondType second(content);

 MyThirdType third(content);

 QVariant firstVariant;
 firstVariant.setValue(first);

 QVariant secondVariant = QVariant::fromValue(second);

 int myType = qRegisterMetaType<MyThirdType>("MyThirdType");

 QVariant thirdVariant(myType, &third); // Here the type isn't checked against the data passed

 qDebug() << "typeName for first :" << firstVariant.typeName();
 qDebug() << "UserType :" << firstVariant.userType();
 qDebug() << "Type : " << firstVariant.type();

 [...]

I get :

typeName for first : MyFirstType 
UserType : 256 
Type :  QVariant::UserType 

typeName for second : MySecondType 
UserType : 257 
Type :  QVariant::UserType 

typeName for third : MyThirdType 
UserType : 258 
Type :  QVariant::UserType