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[Václav Šmilauer <eudoxos@xxxxxxxx>]

> > void Interaction::reset(){
> > 	interactionGeometry=shared_ptr<InteractionGeometry>();
> > 	interactionPhysics=shared_ptr<InteractionPhysics>();
> > 	init();
> > }
> >
> >    
> After this, the interaction is still Real, it has Ip and Ig.

It it a void (shared) pointer!!! Read
http://www.boost.org/doc/libs/1_43_0/libs/smart_ptr/shared_ptr.htm#constructors and casting to bool at the same place.

FYI:

bool isReal() const {return (bool)interactionGeometry && (bool)interactionPhysics;}