Re: Are polymorphic objects possible?
Re: Are polymorphic objects possible?
- Subject: Re: Are polymorphic objects possible?
- From: John Hörnkvist <email@hidden>
- Date: Sat, 2 Nov 2002 07:48:47 +0100
On Saturday, November 2, 2002, at 07:37 AM, Wade Tregaskis wrote:
Is it possible for an object to change at runtime what it appears to
be, to the rest of the program? For instance, if I have two types of
object, say WTFoo and WTBar, can I make another one under some name
(WTMorphy, for example) which can pretend to be WTFoo & WTBar, as it
likes? i.e. I get an instance of WTMorphy, tell it to be a WTFoo,
then at some later point it changes itself to a WTBar?
I know this sounds strange, and I'm not pretending it's necessarily a
good idea to ever actually do, but I'm curious if it's possible. I
can think of a couple of instances where it might be worth testing
this, depending on how well it can be done.
Just change the "isa" and you're done. The only real use I know of is
"thunks" for lazy evaluation.
self->isa=[WTFoo class];
Regards,
John Hornkvist
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