Method: UnboundMethod#bind

Defined in:

eval.c

#bind(obj) ⇒ Object

Bind umeth to obj. If Klass was the class from which umeth was obtained, obj.kind_of?(Klass) must be true.

class A
  def test
    puts "In test, class = #{self.class}"
  end
end
class B < A
end
class C < B
end

um = B.instance_method(:test)
bm = um.bind(C.new)
bm.call
bm = um.bind(B.new)
bm.call
bm = um.bind(A.new)
bm.call

produces:

In test, class = C
In test, class = B
prog.rb:16:in `bind': bind argument must be an instance of B (TypeError)
	from prog.rb:16

# File 'eval.c', line 9628

static VALUE
umethod_bind(method, recv)
VALUE method, recv;