java "instanceof" in c++?

[joseprl89]

Is there a similar procedure in c++ to the java "instanceof"??

I would like to tell apart from the QObject::childs() list which widgets subclass a common base class i created for my subclassed widgets, but I haven't succeeded yet, the code I'm using right now is :

void fetchChildData(QObject* vent){
    QObjectList childs = vent->children();
    for(int i = 0 ; i < childs.size() ; i++){
        displayWidget* dW = dynamic_cast<displayWidget*>(childs[i]);
        if(dW!=0){
            dW->fetchData();
        }
        fetchChildData(childs[i]);
    }
}

void fetchChildData(QObject* vent){
    QObjectList childs = vent->children();
    for(int i = 0 ; i < childs.size() ; i++){
        displayWidget* dW = dynamic_cast<displayWidget*>(childs[i]);
        if(dW!=0){
            dW->fetchData();
        }
        fetchChildData(childs[i]);
    }
}

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But it won't make the trick,... Any help would be really appreciated.

[squidge]

Have you tried QObject::inherits ?

[joseprl89]

Thank you very much squidge!! It works perfectly!

By the way, and just in case I need it in a project without using Qt, is there a way to do this without using QObject::inherits?

[squidge]

C++ does have a typeid operator. An example can be found here: http://msdn.microsoft.com/en-us/libr...8VS.80%29.aspx

However this requires RTTI to be enabled in the compiler. Typically its disabled for performance reasons.

In Qt, you can also use qobject_cast, which doesn't require RTTI support.