From: "David A. Black" <dblack@...>
Date: 2005-10-03T02:58:55+09:00
Subject: Re: Eval and block problems

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Hi --

On Mon, 3 Oct 2005, [ISO-8859-1] Brian Schr=F6der wrote:

> Please help me to wrap my mind around this. I want to achieve the followi=
ng:
>
> class A
>  def self.def_me(cmd, &block)
>    eval %(
>      def #{cmd}()
>         do things
>         # CALL BLOCK
>      end
>    )
>  end
>
>  def_me("foo") do
>    # access instance of A
>  end
> end
>
> A.new.foo
>
> and have the block from the dynamically created method foo be
> evaluated in the binding of the instance of A.
>
> I'm sure this is possible, but I've never really grocked eval,
> instance_eval and class_eval.

I doubt this is the final word in it but see if this helps:

   class A
     def self.def_me(cmd, &block)
       define_method(cmd) do
         puts "Defining method"
         block.call(self)
       end
     end

     def_me("foo") do |a|
       puts "Here in block"
       puts "self is #{self}, a is #{a}"
     end
   end

   A.new.foo


David

--=20
David A. Black
dblack@wobblini.net
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