From: Sander Land <sander.land@...>
Date: 2006-02-20T01:12:59+09:00
Subject: Re: [/QUIZ] metakoans.rb (#67)

> On 2/19/06, George Ogata <g_ogata@optushome.com.au> wrote:
> ...
> define_method("#{arg}?"){|| !send(arg).nil?}
> ...
what about send(arg) == false ?


Here is my solution, pretty similar to the one george posted, though
it doesn't support multiple attributes.

class Module
  def attribute(a,&blk)
    a,val = a.to_a[0] if a.kind_of? Hash
    attr_accessor a
    define_method(a+'?') { !!send(a) }
    define_method(a) {
      if instance_variables.include?('@'+a)
        instance_variable_get('@'+a)
      else
        val || instance_eval(&blk)	
      end
    } if val || blk
  end
end