From: Sean Middleditch <elanthis@...>
Date: 2001-08-08T03:11:51+09:00
Subject: [ruby-talk:19306] Virtual list

For starts, I'm new to Ruby still, forgive me naivette.  (Is that even a word?)
I'm mostly a C++ programmer, so my terminology might be a little off towards
that direction.. ^,^

If I have a class Object (in C++, called AMObject in Ruby), and it has two
lists in it - a list of attributes (properties of an item), and containers
(difference types of containers that store more Objects), how can I make a clean
interface to traversing these objects in Ruby?

In C++ the tree is like:
	Object (class object)
		attributes (class list<obj_attr *>)
			obj_attr
			obj_attr
			...
		containers (class list<container *>)
			container
			container
			...

Something like this in Ruby would be nice:
	obj.attrs.for_each { |a| whatever... }
How do I go about making a clean class for "attrs?"  I'd also like to have the
ability to append/remove entries from the list, so I know there will be a bit of
work involved.  The class would have to store a reference to the parent Object.
But how would I go about generating such a class?  Preferrably in a generic way
so that all types of objects could be stored within.

There, I think that was a ludicrous amount of information for such a simple
question.  I hope I made that clear enough...

Sean Etc.