My boost::shared_ptr objects hold pointees to interfaces. It might happen that these raw pointees might become invalid or that I like to change the implementation. Is it possible to change the raw pointee of all boost::shared_ptr objects in an application due to some kind of event? Example: I have one singleton class that provides several factory functions: class Factory { public: boost::shared_ptr<IFoo> CreateX( void ); // ... more factory functions private: // Events - void OnChangeImplementationX( void ); // Data members typedef std::vector< boost::shared_ptr<IFoo> > MasterColl; MasterColl m_FooObjects; } boost::shared_ptr<X> Factory::CreateX( void ) { // Create a new foo object boost::shared_ptr<IFoo> pFoo( new FooImpl ); // Save a "master" instance m_FooObjects.push_back( pFoo ); // Return the object return pFoo; } void Factory::OnChangeImplementationX( void ) { // Iterate over all "master" objects and change the underlying pointee } Can this be implement using the boost::shared_ptr class? Regards, -Dirk