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I'm getting the following compile error in one of my classes, using gcc 3.4.5 (mingw): src/ModelTester/CModelTesterGui.cpp:1308: error: request for member `addListener' is ambiguous include/utility/ISource.h:26: error: candidates are: void utility::ISource<T>::addListener(utility::IListener<T>*) [with T = const SConsolePacket&] include/utility/ISource.h:26: error: void utility::ISource<T>::addListener(utility::IListener<T>*) [with T = const SControlPacket&] Hopefully you can see that ISource<T> is a template interface that just indicates that the object can be an informer for an object that is of some matching type IListener<T> . So the thing that has me irked is this idea that for some reason functions are ambiguous when, as far as I can tell, they are not. The addListener() method is overloaded for different input types IListener<const SConsolePacket&> and IListener<const SControlPacket&> . The usage is: m_controller->addListener( m_model ); Where m_model is a pointer to an IRigidBody object, and IRigidBody inherits only from IListener< const SControlPacket& > and definately not from IListener< const SConsolePacket& > As a sanity check, I used doxygen to generate the class hierarchy diagram and doxygen agrees with me that IRigidBody does not derive from IListener< const SConsolePacket& > Evidently my understanding of inheritence in c++ is not exactly correct. I'm under the impression that IListener<const SControlPacket&> and IListener<const SConsolePacket&> are two different types, and that the function declarations addListener(IListener<const SConsol

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