undefined reference to vtable for …

Question

I am trying to write an Http proxy that basically works like indianwebproxy

So i fired up qtcreator and but one of my classes is failing to compile with the infamous

Answer 1

You can't copy QTcpSockets, so it may cause other cryptic errors if you try to pass them by copy rather than by address.

    HttpProxyThreadBrowser(QTcpSocket * outgoingSocket,QTcpSocket * browserSocket,QObject *parent = 0);

private:
    QTcpSocket* outgoingSocket;
    QTcpSocket* browserSocket;

And completely recompiling your project may help, when you change header files, because qmake generated Makefile can sometimes fail to notice the changes.