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Re: Are polymorphic objects possible?

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Re: Are polymorphic objects possible?

Subject: Re: Are polymorphic objects possible?
From: Chris Hanson <email@hidden>
Date: Sat, 2 Nov 2002 01:03:55 -0600

At 5:37 PM +1100 11/2/02, Wade Tregaskis wrote:

Is it possible for an object to change at runtime what it appears to be, to the rest of the program?

Yes[1]. After all, objects are just responding to messages. You can respond to arbitrary messages by overriding -[NSObject methodSignatureForSelector:] and [NSObject -forwardInvocation:].

This is essentially how NSProxy/NSDistantObject works. See the documentation for -[NSObject forwardInvocation:] for more details.

-- Chris
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