From: Robert Klemme <bob.news@...>
Date: 2005-01-27T22:50:54+09:00
Subject: Re: Duping a class causes error


"Trans" <transfire@gmail.com> schrieb im Newsbeitrag
news:1106832987.976217.139210@f14g2000cwb.googlegroups.com...
> Maybe someone can offer me a possible reason for this. I have a set of
> classes in a module called Markers. I have a module method,
> Markers#list, that does nothing more than collects them into an array.
> Then in my program when I do:
>
> | markers = Markers.list
>
> It works. But when I do:
>
> |  markers = Markers.list.collect { |m| nm = m.dup ; nm }

You can also do:

markers = Markers.list.collect { |m| m.dup }

> It does not work.
>
> I don't understand why. Obviously my initial thought is that something
> about my Marker classes must not be shallow, but they're just classes,
> made of methods and have no state, so I don't see how that can be.

So Markers.list returns a list of class objects?

> (Actually they do have a small bit of boolean state in a class instance
> var, but I check and it is being duplicated.)
> I just don't get it. Any ideas?

What exactly goes wrong?

    robert