From: "Bartosz Dziewoński" <matma.rex@...>
Date: 2012-02-21T02:19:41+09:00
Subject: Re: Metaprograming question about initialize

2012/2/20 Ralph Shnelvar <ralphs@dos32.com>:
>
> What I want to do is not change the interface but the implementation.  That is, I want to get a list of the names of the arguments by introspection.

It is much simpler and IMO makes much more sense not to figure out
variable names while already having variables, but to figure out their
contents while having names. Like this:

class Class
  def attr_accessor_init *meths
    attr_accessor *meths
    define_method :initialize do |*args|
      meths.each_with_index do |m, i|
        self.send :"#{m}=", args[i]
      end
    end
  end
end

irb(main):013:0> class A
irb(main):014:1> attr_accessor_init :a, :b, :c
irb(main):015:1> end

irb(main):029:0> A.new 4, 6, 8
=> #<A:0xd6cb18 @a=4, @b=6, @c=8>


(This is, essentially, what Struct class does.)


-- Matma Rex