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@implementation Thingie @synthesize name; @synthesize magicNumber; @synthesize shoeSize; @synthesize subThingies; - (id)initWithName: (NSString *) n magicNumber: (int) mn shoeSize: (float) ss { if (self = [super init]) { self.name = n; self.magicNumber = mn; self.shoeSize = ss; self.subThingies = [NSMutableArray array]; } return (self); } - (void) dealloc { [name release]; [subThingies release]; [super dealloc]; } // dealloc

The first line allocates objSimple, and the runtime assigns the object a reference count of one The second statement creates a new pointer to the objSimple object; both objSimple and objSimpleTwo point to the same physical object in memory But because the code doesn t call retain, the physical object s reference count is not incremented When the object is then released, the reference count is decremented by one and the reference count for the object becomes zero The object is deallocated, so the next line fails, as objSimpleTwo is pointing to deallocated memory space Instead, the code should have explicitly retained objSimpleTwo

- (NSString *) description { NSString *description = [NSString stringWithFormat: @"%@: %d/%.1f %@", name, magicNumber, shoeSize, subThingies];

[objSimpleTwo retain];

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The discount pertains to pricing shares below the market valuation offered to investors on the same round, which yields preferential pricing 2 Warrants are a form of stock shares similar to options, typically priced below market, with an exercise time and price 3 Usually the first professional investor round of funding in a privately held company is procedurally labeled Series A, the second round Series B, etc 4 The value attributed to the company prior to the investment capital, also known as prefinancing

Retaining objSimpleTwo would have incremented the object s reference count by one, bringing it to two Then, when objSimple was released, the object s reference count would still be one and the object would not be deallocated The subsequent call to sayHello would work just fine, as the object that objSimpleTwo pointed to would still exist Note, this is a somewhat unrealistic example, as you will never write code like Listing 3-15, but it illustrates retain and release You can override the NSObject s retain, release, dealloc, and alloc methods But if you do, be certain to call the object s super method version The method call for these methods must make it up the inheritance hierarchy to NSObject for memory management to function correctly

This chunk of code will initialize a new object, clean up any messes we have made, create the stub methods to make the compiler happy over us adopting NSCoding, and return a description. Notice that in the init method we re using self.attribute on the left-hand side of the assignments. Remember that this actually means that we re calling the accessor methods for those attributes, and these methods were created by @synthesize. We re not doing a direct instance variable assignment. This object creation technique will get us proper memory management for the passed in NSString and for the NSMutableArray we create, so we don t have to provide it explicitly. So, inside of main(), make a Thingie, and print it:

Simplem (Listing 3-16) Note that retain returns an id, and that all these methods are declared in NSObject and don t require you to add their signatures to Simpleh Listing 3-16 Simplem modified to include memory management methods

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Thingie *thing1; thing1 = [[Thingie alloc] initWithName: @"thing1" magicNumber: 42 shoeSize: 10.5]; NSLog (@"some thing: %@", thing1);

#import "Simpleh" @implementation Simple + (void) sayGoodBye { NSLog(@"Goodbye"); } -(void) sayHello: (NSString *) name { NSMutableString *message = [[NSMutableString alloc] initWithString:@"Hello there"]; [message appendString:name]; NSLog(message); [message release]; } -(void) dealloc { NSLog(@"deallocating Simple"); [super dealloc]; }

The preceding code will print out this:

(continued)

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