On Jun 12, 2008, at 2:29 AM, Graham Cox wrote:
On 12 Jun 2008, at 5:03 pm, Chris Suter wrote:
In the original example, myNum was being passed as a argument
rather than having a message to sent to it and it’s often not safe
to pass nil objects as arguments.
Hmmm... well, what's the function it's passed to going to do with
it, other than call a method on it? If it's doing anything else,
it's breaking other (much stronger) rules. If it tries to access its
ivars directly, that's breaking encapsulation.
Not if you're passing an object to a method of its own class. Then,
it's permitted to access its own implementation details. So, for
example, -[NSDictionary initWithDictionary:] may very well operate by
accessing the internal details of the passed-in dictionary.
Regards,
Ken
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