From: Robert Klemme <bob.news@...>
Date: 2005-04-18T16:39:37+09:00
Subject: Re: self


"Trans" <transfire@gmail.com> schrieb im Newsbeitrag
news:1113782539.239967.177710@z14g2000cwz.googlegroups.com...
>
> Robert Klemme wrote:
> > Btw, I would find something like this useful in the std lib:
> >
> > class Class
> >   def properties(*h)
> >     h = h[0] if h.size == 1
> >     initial = {}
> >
> >     h.each do |name, val|
> >       attr_accessor name
> >       initial[name]=val unless val.nil?
> >     end
> >
> >     unless initial.empty?
> >       alias :new_plain :new
> >       class<<self;self;end.instance_eval do
> >         define_method(:new) do |*a|
> >           obj = allocate
> >           initial.each {|name, val| obj.send("#{name}=".to_sym, val)}
> >           obj.instance_eval { initialize(*a) }
> >           obj
> >         end
> >       end
> >     end
> >
> >     h
> >   end
> > end
>
> Ubfortunately, I think it is a bit dangerous to mess with #new like
> this as a standard practice. Yet I do not see any other way to set the
> instance vars. Agree or no?

Yes - for current versions.  But with wrappers (or hooks) this will be
easier in 2.0 I guess.

Kind regards

    robert