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- (void)dealloc { [self setOne:nil]; [self setTwo:nil]; [self setThree:nil]; [self setFour:nil]; [super dealloc]; } A -dealloc method must do the following: Close any open files, release any resources, free any non-object memory, and any other actions that would be appropriate in a -finalize method. Release all retained objects with a -release or -autorelease message. Send [super dealloc] as its last statement. The pattern in Listing 24-12 is the fastest and most efficient, avoids side-effects of property setters, and is the most commonly used pattern.

The pattern in Listing 24-13 is less efficient, but has a couple of advantages. It clears the references using the property setters. If the setters need to notify observers or perform other housekeeping, this pattern permits them to do so. In addition to releasing the held property, it sets the property value to nil. This could be important if any code later in the -dealloc method attempts to use the property for any purpose which would be very bad if the property was still pointing to a deallocated instance. The first pattern, as coded, tries to avoid this problem by not sending any other messages to itself during deallocation. But as object relationships become more complex, it s harder to ensure that will always work. For example, a retained object might have a pointer back to the object that owns it (self), and during its deallocation might attempt to use one of the properties of its owner.

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n February 2005, Mark Tilden and I met in New York City to talk about, what else robotics and Robosapien. He was in town for the upcoming International Toy Fair, and we met in the heart of midtown Manhattan at Wolfgang s Steakhouse. In between the historic tiled ceilings of what used to be the old Vanderbilt Hotel, and a sizzling platter of perhaps the best porterhouse I have ever tasted, he took me step by step through the design history of the Robosapien robot from the earliest prototypes, to computer-generated renders that didn t make the cut, to an early look at what is in store in the years ahead. I walked back to my hotel with my appetite for steak, as well as my thirst for knowledge about the development of the Robosapien, fully sated. In this chapter I d like to share with you some of the photographs that Mark shared with me. I have included the full text of our talk, which lasted almost three hours, in the Appendix to this book.

Sending -dealloc to the superclass is an absolute requirement. So much so that modern Objective-C compilers now emit a warning if you fail to do so. The base class -dealloc method is the one that actually deallocates (frees) the memory occupied by the instance. Failing to send -dealloc will cause memory leaks. After the superclass s -dealloc message returns, the object no longer exists and self is invalid. You cannot access any of the object s instance variables nor send it a message.

Figure 3-33b. Another view of the final rear-wheel base Congratulations! You ve finished the rear-wheel base. Do a quick check and compare the base you assembled to the one shown in Figures 3-33a and 3-33b. If you re satisfied with it, now it s time to pull all the sub-assemblies together. You should have the following ready to go: Head and neck assembly Main body with motor/wheel combinations Rear-wheel base Cable frame Place them all within reach. It s time to finish building the ExploroBot.

Objects retained by other objects your object retains are referred to as implicitly retained objects. An object should only retain objects it maintains a direct reference to; objects retained by other objects are managed by those objects. An example of implicitly retained Zombie objects is shown in Listing 24-14.

@class Zombie; @interface ZombiePoetryGroup : NSObject { NSMutableDictionary *members; } - (BOOL)hasMemberNamed:(NSString*)zombieName; - (void)addMember:(Zombie*)newZombie; - (void)removeMember:(Zombie*)zombieZombie; @end @implementation ZombiePoetryGroup

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