Why isn’t my weak reference cleared right after the strong ones are gone?

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From the assembly code it can be seen that accessing weakPtr generates a objc_loadWeak call.

According to the Clang documentation, objc_loadWeak retains and autoreleases the object and is equivalent to

id objc_loadWeak(id *object) {
  return objc_autorelease(objc_loadWeakRetained(object));
}

This (hopefully) explains why both

if(strongPtr == weakPtr) ...

and

NSLog(@"weakPtr: %@", weakPtr);

create additional autoreleased references.

This is not a special NSString problem, I could reproduce the same behaviour with a custom (plain) class.

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