From: Martin <yodlep@...>
Date: 2005-10-12T07:21:53+09:00
Subject: calling blocks with arguments from other contexts

Hi,

I'm having trouble with Procs.

The following piece of code works only if I use "x.green" rather than just
plain "green"

class Foo
  def red(&p)
    @z = p
  end

  def blue(y)
    instance_eval{@z.call y}
  end

  def green
    puts "Yeah!"
  end
end

x = Foo.new

x.red do |y|
  green # I don't want to use x.green
  puts y
end

x.blue 5
The following code works. It is able to call the "green" method from inside
the Foo class without being able to prefix it with "x.", but I can't handle
any arguments like in the above code:

class Foo
  def red(&p)
    @z = p
  end

  def blue
    instance_eval(&@z)
  end

  def green
    puts "Yeah!"
  end
end

x = Foo.new

x.red do
  green
end

x.blue

My main goal is to be able to refer to the "green" in the closure "x.red do
green end" without using "x.green" and also be able handle arguments at the
same time like in the first piece of code, but as you know, the first piece
of code doesn't work.


Is there any way to achieve this?