Re: Copying an Object

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Daniel Kolbo wrote:

> Say you have two classes: human and male.  Further, say male extends
> human.  Let's say you have a human object.  Then later you want to make
> that human object a male object.  This seems to be a pretty reasonable
> thing to request of our objects.

I don't think any human can change gender without major surgery, but I
don't know if you just chose your example badly or whether you really
think objects should be able to mutate into other types of object
without some kind of special treatment.

> This type of thing would especially be
> easy if objects of parent classes could be cast as an object of its
> extended class.

Where would the extra data come from to fill in any fields the base
class does not have? Just think of a simple example with a Shape class,
extended by a ColouredShape class which contains some data about the
object's colour - if you have a Shape object it can't become a
ColouredShape without some surgery because bits of the ColouredShape's
anatomy are not present.

--
Gary        Please do NOT send me 'courtesy' replies off-list.
PHP 5.2.12 (cli) (built: Jan 14 2010 14:54:11)
1.7.7(0.230/5/3) 2010-08-31 09:58 Cygwin


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