[REBOL] Re: Dynamically Modifying objects!
From: edanaii:cox at: 22-Feb-2003 13:50
Joel Neely wrote:
>Hi, Ed,
>
>Ed Dana wrote:
>
>>... I merely stated that this was my solution to the "problem".
>>
>>For all intents and purposes, the object is dynamic.
>>Maybe not in the truest sense of the word, but certainly enough
>>to achieve my goals.
>>
>>
>>
>
>Apparently I didn't understand understand your goals. Sorry.
>
No big whoop, really. :)
>>This was never my intention. I didn't want attributes shared
>>between parent and child dynamically...
>>
>>I wanted the ability to add and remove attributes from the
>>currently instantiated object.
>>
>>
>>
>
>I'm not clear on what you mean by "parent" and "child", but here's
>what I was trying to address:
>
Inheritance. You're original example allowed you to create a parent,
create the child, assign a new attribute to the child which is then
owned by the parent as well. Dynamic Inheritance, to be exact.
> >> dee: make object! [firstname: "Tweedle"]
> >> dum: dee
> >> dee/firstname: "Twaddle"
> == "Twaddle"
> >> dum/firstname
> == "Twaddle"
>
>There's only one object here. There just happen to be multiple
>words that refer to it. Any changes to the one object are visible
>via any way we can access it. This is different from
>
> >> dee: make object! [firstname: "Tweedle"]
> >> dum: dee
> >> dee: make dee [middlename: "Xavier"]
> >> dum/middlename
> ** Script Error: Invalid path value: middlename
> ** Near: dum/middlename
>
>where "the currently instantiated object" isn't changed at all, but
>a new object is constructed and one of the words is set to refer to
>that new one.
>
>If your goals are such that you always have a single specific word
>(or some other distinguished reference) that you're using, and
>never have to e.g. pass as an argument to a function, keep up with
>via a reference in a block, etc. then by all means, ignore the
>suggestion for an extra layer.
>
My goal was simply to add and remove attributes from an object. Create a
new object based on the parent, and then add and remove attributes from
that object. Both separate and distinct from one another, but mutable.
The object is used as a parent for a class called Parameter! which is
then used to provide data to html in name/value pairs.
--
Sincerely, | Cold Hearted Orb, that rules the night. Removes
Ed Dana | the colours from our sight! Red is gray and
Software Developer | yellow white! But we decide which is right...
1Ghz Athlon Amiga | And which is an illusion!
| -- The Moody Blues, Late Lament.
