keyboardhandler class help

Hi, I am trying to write a program where I load some CAD objects and then try to move them and manipulate parts of them using a keyboard handler. I found the example on the osg tutorials page but I'm having the following problem: How I can modify the function that is in keyboardhandler.h which is currently: typedef void (*functionType) (); //change this to the one below: typedef void (*functionType) (osg::PositionAttitudeTransform* PAT, double& value); The reason I want to do this is because for example a function like: void moveForward(osg::PositionAttitudeTransform* PAT, double& value); //in my main() I want to pass it a PAT node and the value of either x/y/z coordinate and modify it in the function. Currently the way I have it setup doesnt allow me to pass paramters so I have to keep these values as global variables so they can be accessed by any function. But I want to avoid this. ---------------------------------------------------------------------------------------------------------------------------------------------------------------- For reference I will copy the keyboard handler class below: class keyboardEventHandler : public osgGA::GUIEventHandler { public: typedef void (*functionType) (); enum keyStatusType { KEY_UP, KEY_DOWN }; struct functionStatusType { functionStatusType(){keyState = KEY_UP; keyFunction = NULL;} functionType keyFunction; keyStatusType keyState; }; bool addFunction(int whatKey, functionType newFunction); bool addFunction(int whatKey, keyStatusType keyPressStatus, functionType newFunction); virtual bool handle(const osgGA::GUIEventAdapter& ea,osgGA::GUIActionAdapter&); virtual void accept(osgGA::GUIEventHandlerVisitor& v) { v.visit(*this); }; protected: typedef std::map keyFunctionMap; keyFunctionMap keyFuncMap; keyFunctionMap keyUPFuncMap; };