undefined symbol: typeinfo for <class>

[user4592357]

i have a header file where i declare a class derived from QObject and with Q_OBJECT macro.
the class is an interface class (with a lot of slots), so i don't have a source file.

when i derive a class from the interface, i get a runtime error: undefined symbol: typeinfo for <class>
if i add a blank source file with just #include "interface.h" statement, everything works.

i think that when i include the "interface.h" in my "class.h", then include the "class.h" in "class.cpp", moc should be fine and generate the moc file, right? so what am i missing?

[Kent-Dorfman]

I'm pretty sure that you ARE breaking the MOC by not having a source file. The inability of Qt to define a Q_OBJECT class completely in a header file is a known limitation...at least known to me. LOL

On a sidenote. I don't believe a QObject derived class can be a pure abstract class since QObject itself is not an interface but rather a concrete class.