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gistfile1.txt

control_center.h
  variables:
   puOneShot * dec_dt_button;
   
  methods
   static void alterDT(puObject *);  
   void init( boost::shared_ptr<Simulation> residentSimulation );

-----------------------
control_center.cpp

 void control_center::alterDT(puObject * caller) {                                                                                             
  cout << "\nRetrieving user Data from caller" <<endl; 
  boost::shared_ptr<Simulation> * spPointer = (boost::shared_ptr<Simulation> *)caller->getUserData();
  if ( spPointer == NULL )
  {
   cout << "Retrievd a stupid null value from puObject!" << endl;
  }
  // cout << "Control_center.simulation.dt: " << spPointer->getDT() << endl;
  boost::shared_ptr<Simulation> curSimulation = boost::shared_ptr<Simulation>( *spPointer );
  cout << "Control_center.simulation.dt: " << curSimulation->getDT() << endl;
}
  
void control_center::init( boost::shared_ptr<Simulation> residentSimulation ) {   
  ...
    dec_dt_button = new puOneShot(curX, curHeight - elementHeight, curX+placementWidth, curHeight);
    curX += (placementWidth +gap);dec_dt_button->setLegend("Slower");
    cout << "About to set user Data" << endl;
    cout << "residentSimulation: " << residentSimulation << endl;
    cout << "residentSimulation->dt: " << residentSimulation->getDT() << endl;
    dec_dt_button->setUserData( &residentSimulation );
    dec_dt_button->setCallback( alterDT );
    
    boost::shared_ptr<Simulation> * spPointer = (boost::shared_ptr<Simulation> *)dec_dt_button->getUserData();
    cout << "\nRetrieving user Data from dec_dt_button after setting callback" << endl;
    if ( spPointer == NULL )
    { 
      cout << "Retrievd a stupid null value from dec_dt_button!" << endl;
    }
    cout << "userData: " << *spPointer << endl;
    cout << "userData->dt: " << (*spPointer)->getDT() << endl; 

  ...
}