objective c - __autoreleasing in error:(NSError *__autoreleasing *)outError -


I saw this pattern in apple functions which return errors 

  error: ( NERR * __ Autorezing *) External error   
 I understand that this is an indicator of the indicator, used to complete the result (only * using only local copy variables I'm concerned about changing, but not out)  
 
 __i autoreleasing   
  If I leave it out Vendor What happens then? Do I get a leak? Why is it necessary?   
 ........ ............. .........   < p> 
 
 You do not have to specify  __autoreleasing  for specifying, for example  
  - (BOOL) doSomething: (NSError **) error;   
 The ARC compiler automatically includes  __autotizing . It is explained in the documentation:  
 
 4.4.2 Indirect parameter  
 If a function or method parameter is type T *, where T is a proprietor-not ineligible Qualified Indicator Type:  
     
  •  If T is a const-qualified or class, then it is viable with __unsafe_unatedened;  
  •  Otherwise, it is vested with __autoreleasing.    
     Xcode code completion is also known about it and displays the  (NSError * __ autoreleasing *) error .   
      Calling  such a function ARC compiler automatically "correctly" so that you can call  
      NSError * error ; BOOL success = [self-doSomething: and error]; As explained, the compiler incorporates a temporary  __autoeryising  variable:  
      NSError * error; NSError * __autoreleasing tmp = error; BOOL success = [self doSomething: & amp; Amp; TMP]; Error = TMP;   
     (You can read 4.3.4 "Passing by a parameter to write" in the CLAG / ARC documentation for the explanatory description.)

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