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Autorelease use the following methods:

1) Generate and hold NSAutoreleasePool objects;

2) Call the Autorelease instance method of the allocated object;

3) Discard NSAutoreleasePool objects.

How is the autorelease implemented? To insert the card GNUstep source code.

[obj autorelease];

-(ID) autorelease

{

[NSAutoreleasePool addobject:self];

}

The essence of the Autorelease instance method is to invoke the AddObject class method of the NSAutoreleasePool object.

The implementation of the NSAutoreleasePool class,

+ (void) AddObject: (ID) anobj

{

NSAutoreleasePool *pool = Obtains the NSAutoreleasePool object being used;

if (poo! = nil)

{

[Pool addobject:anobj];

} else

{

NSLog (@ "NSAutoreleasePool object does not exist in the state called Autorelease");

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