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Re: NSLog(@"%@",[NSProxy class]);

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Re: NSLog(@"%@",[NSProxy class]);

Subject: Re: NSLog(@"%@",[NSProxy class]);
From: Philippe Mougin <email@hidden>
Date: Sun, 12 Mar 2006 01:03:17 +0100

Agent M wrote:
> I have come across a difficulty with an NSProxy subclass
> on 10.3.9 which can be summed up with the following lines:
>
> Class p=[NSProxy class];
> NSLog(@"class %@",p);
>
> The second line throws an exception:
> *** Uncaught exception: <NSInvalidArgumentException>
> *** -[NSProxy methodSignatureForSelector:] called!

Actually this is a general problem. Briefly, the whole meta level of the NSProxy class hierarchy is broken, making the NSProxy class object non-functional. The problem comes from the fact that, in the current (broken) implementation, NSProxy's meta class inherits from the NSProxy class. This mimics the NSObject class system layout, but while this layout is correct for NSObject, it is not correct for NSProxy because of the differences in semantic between the concept of an object an the concept of a proxy.

Executive summary: the NSProxy class object is broken. Do not use it, or write workarounds (like you did) to support the functionality you need.

Best,

Philippe Mougin
http://www.fscript.org

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