In Objective-C, what does this method do?

user_5898654 0
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What does this method do? Why return nil if you want the clock ref? What is the (void)clock part? Happy to delete if this is dumb. I couldn't find the terms to use to find an answer.

- (CMClockRef)clock
{
  (void)clock;
  return nil;
}

and why can't I just do:

- (CMClockRef)clock
{
  return CMClockGetHostTimeClock();
  // Build error: Ivar 'clock' which backs the property is not referenced in this property's accessor
}

Without getting an error?

objective-c
1 Answers

The method is a property getter. A property

@property (assign) CMClockRef clock;

is declared somewhere.

That property is backed up by an ivar called clock. This method overrides or implements the property getter to return nil.

Statement

(void)clock;

only silences warning/error saying that the ivar has not been used in the getter.

user_6695860
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