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Every second, the timer fires the handleTimeSecond method The handleTimeSecond method then sends a ripen message to Apple and Orange Behind the scenes, the runtime sees if myApple or myOrange can respond to the ripen message sent by myEnvironment Neither can, and so the runtime checks each class parent class for the method, finds it, and calls it instead It does the same with the getState method Figure 6-4 illustrates how the runtime handles inherited methods When an Orange instance is sent a ripen message, the runtime first checks to see if Orange can respond to the message If it cannot, then it checks Orange s parent The runtime continues checking Orange s ancestor hierarchy until it either finds a class that can respond to the message or it reaches NSObject If no ancestor class can react to the message, then a runtime error occurs

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(continued)

Figure 7-5

Notice that just for fun, you threw in the isKindOfClass, isSubclassOfClass, and respondsToSelector methods in Listing 6-9 The isKindOfClass method checks if an object is an instance of a class or an instance of one of a class child classes The isSubclassOfClass checks if a class is a subclass of another class The respondsToSelector method checks if a class can respond to a method sent to it In this example, all three return 1, or YES Note that neither Orange nor Fruit implements a foo method, and so the respondsToSelector for foo returns 0, or NO The important concept to take from this example is how inheritance works Child classes inherit the instance variables and methods of their parent They also inherit from every one of their ancestors

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For example, accessing the descriptor data of each subclass is performed with the non-virtual Ptr() method defined in the TDesC base class (In fact, there are no virtual methods within the descriptor hierarchy) This method uses the type data stored in each descriptor instance as the control variable for a switch statement that then returns the proper address referring to the beginning of the data By preserving the length (and maximum length) of a descriptor, its method calls are able to perform appropriate validation and prevent the unintentional access to out-of-bounds memory When a method call would read or write beyond the data boundaries, the process will panic and immediately terminate This means that with traditional descriptors, the burden of correct memory management falls solely on the shoulders of the developer They must verify that the descriptor can accommodate the amount of incoming data before calling a method that would modify the contents of the descriptor Recognizing these difficulties, Symbian has developed and released a new library The EUserHL Core Idioms Library provides a pair of descriptors (LString for Unicode-aware text and LData for simple byte buffers) that manage their own memory These descriptors automatically reallocate themselves to increase their capacity and then release the resources when they go out of scope, similar to the behavior of standard C++ strings Because these two classes have been derived from their respective TDesC class (TDesC8 and TDesC16), they can be used as parameters

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