From: Paul Carey <paul.p.carey@...>
Date: 2009-10-20T20:12:59+09:00
Subject: instance_eval with method proc

Hi

I'm trying to invoke a method defined in one class with self set to an
instance of a different class. I didn't have much success (as shown
below). Is there another way to achieve this?

Many thanks

Paul

----

class Foo
  def foo
    print
  end

  def print
    puts "foo"
  end

  def test bar
    foo_proc = Proc.new { print }

    # Prints bar
    bar.instance_eval(&foo_proc)

    # 1.8.6 Fails with "wrong number of arguments (1 for 0) (ArgumentError)"
    # 1.9.1 Prints foo
    bar.instance_eval(&method(:foo))
  end
end

class Bar
  def print
    puts "bar"
  end
end

Foo.new.test Bar.new