From: Michael Garriss <mgarriss@...>
Date: 2003-09-14T15:05:15+09:00
Subject: [OT] Re: Dot versus double-colon


Hal Fulton wrote:

> I think I meant constant_missing. Hmm, *is* there a constant_added??? If
> not, maybe there should be.
>
> But constant_missing might not be useful here. My brain is *really*
> getting cloudy now.
>
> I'm the same way. I've overused eval in the past (by some people's
> standards). But now we've got const_[gs]et, instance_variable_[gs]et,
> define_method, and all that coolness. These often obviate the need
> for eval.
>

Just had to share this super ugly example from some of my #eval happy code:

def add_cols( *mods )
eval(<<CODE
class << self
  [#{mods.join(',')}].each do |mod|
    name = mod.to_s.sub('Rextra::DB::Col::','')
    eval(eval("Rextra::DB::Col.new_col(name,eval(\\"\#{mod}::NEW_COL\\" 
))"))
  end
  def new( *args )
    obj = super( *args )
    methods.each do |m|
      method(m).call(obj) if m =~ /^__new_col_/
    end
    obj
  end
end
CODE
)
end


Check out the four layers deep eval.  Don't ask......

Michael