Re: How to check if super exists if it doesn't without throwing an exception?
Re: How to check if super exists if it doesn't without throwing an exception?
- Subject: Re: How to check if super exists if it doesn't without throwing an exception?
- From: Jens Alfke <email@hidden>
- Date: Thu, 18 Jun 2015 13:13:35 -0700
> On Jun 18, 2015, at 1:06 PM, Alex Zavatone <email@hidden> wrote:
>
> I've got some spooky code that I'm digging into that calls an instance method in an uninstantiated timer class
I’m not clear on what that means. If the class doesn’t have any instances, how are you calling an instance method on it?
> Within this pearl, we have [super sendevent:event]; within an @try block.
> At the point of the exception, super isn't even accessible, declared or defined.
‘super’ isn’t an object. It’s a language keyword that’s used as the receiver of a method call (message-send). It just means to call the superclass’s implementation of the method, or more literally, “send this message to self but ignore any implementation in self’s class, instead starting lookup in the superclass.”
If [super sendEvent:event] throws an exception, it means that the superclass does not have a -sendEvent: method.
—Jens
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