From: Ryan Leavengood <leavengood@...>
Date: 2005-10-03T03:03:44+09:00
Subject: Re: Eval and block problems

On 10/2/05, Brian Schr�der <ruby.brian@gmail.com> wrote:
> Please help me to wrap my mind around this. I want to achieve the following:
[code snipped]
>
> 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.

Good question! Because by researching the answer I learned you can
just pass a block to define_method:

class A
  def initialize(x)
    @x = x
  end

  def self.def_me(cmd, &block)
    define_method(cmd, &block)
  end

  def_me("foo") do
    puts "x is #@x"
  end
end

A.new(1).foo
A.new(2).foo
__END__

But strictly speaking in this case the separate def_me method is
redundant since you could just call define_method directly.

Ryan