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My question may sound stupid an all, but I like to know what happens if I mark an autoreleased object as autorelease. Will it be released twice? Or nothing happens? For example:
Obj * obj = [[Obj create] autorelease];
Let's say [Obj create] returns an autoreleased object.
If I add another autorelease, what happens then?
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Filters. (computing) Automatic release (of previously allocated resources)
The system that Objective-C uses is called retain/release. The basic premise behind the system is that if you want to hold on to a reference to another object, you need to issue a retain on that object. When you no longer have a use for it, you release it. Similar to Java, each object has a retain count.
The NSArray class method array returns a newly initialized array that is already set for autorelease. The object can be used throughout the method, and its release is handled when the autorelease pool drains. At the end of this method, the autoreleased array can return to the general memory pool.
Yes, sending autorelease twice will release the object twice. If your create method returns an autoreleased object and you send another autorelease message to it, your app will crash, because you'll be releasing a deallocated object.
Having said that, why don't you use the new Automatic Reference Counting (ARC)? You don't have to worry about (auto)releasing objects anymore.
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