Question

Is there a way to get a true proc from a method in Ruby?

An UnboundMethod obtained via instance_method does not fit the bill because I can only bind it to an object of the class that declared the method. I can’t reinterpret self inside the method body the way I could in a proc (using instance_exec).

Similarly, a Method obtained via method is not okay, because self is bound to the receiver of method and I cannot change it.

Edit (Clarification):

What I’m trying to do is to take a method defined in one class and transfer it to another class. This means I need to be able to reinterpret the meaning of self within the method. For procs, this is possible via instance_exec and instance_eval, but not for methods.

Why I am trying to move methods from one class to another? Long story short, to implement a form of namespacing, as I am most displeased with the visibility control provided by Ruby (there is no way to hide a module member to an including class). This is however far beyond the scope of this question.

Answer 1

Maybe to_proc from Method can help you:

class A
  def test
    puts 'this is a test'
  end
end

m = A.new.method(:test)

m.to_proc.call #=> this is a test

UPDATE: Just an idea

By using sourcify gem convert proc from first object to source, and then evaulate it in the context of second object