Virtual functions are dynamically bound, but default parameters are statically bound.

It means that you may end up invoking a virtual function defined in a derived class but using a default parameter value from a base class

Alexander’s Star

Function arguments in C++ are passed by-value. A copy of each argument is made. A function works with the copy, not the original

initialize is a class method which will be called before any other method is called on a class. Alternatively use a function with attribute ((constructor))

To find out what iOS device is attached to the system, we can try monitor

http://developer.apple.com/library/ios/#featuredarticles/ExternalAccessoryPT/Articles/MonitoringEvents.html