Abstract class and vector issue

[Graham]

You can declare a destructor as pure virtual, but you have to give it a definition - you can't get away with not defining a destructor that you've declared - that's one function that will definitely be called. In this case, however, I would suggest that simple inline blank destructor is all that's needed:

class SceneObject
{
public:
     virtual ~SceneObject() {}
//...
};