Inheritance and super function

ruby-talk
1

hello,
Say I have the following Ruby code.
Class A
  def test
    puts "I am A"
  end
end

Class B < A
  def test
    puts "I am B"
  end
end

Class C < B
  def test
    puts "I am C"
  end
end

Now, in the function test in Class C, I want to call the test method defined
in class A, by passing B's test method.

How can I do this, just using plain 'super' doesn't work? Is it possible to do
this?

Either way, please help

Thanks in advance,

···

--
Surendra Singhi
http://ssinghi.kreeti.com, http://www.kreeti.com
Read my blog at: http://cuttingtheredtape.blogspot.com/
,----

Great wits are sure to madness near allied,
And thin partitions do their bounds divide.

    (John Dryden, Absalom and Achitophel, 1681)

`----

2

Use instance_method and bind.

module Kernel
  def super_n(n=1)
    self.class.ancestors[n].instance_method(caller.first[/`(.*)'/][1..-2]).bind(self).call
  end
end

class C < B
def test
   puts "I am C"
   A.instance_method(:test).bind(self).call
   self.class.superclass.superclass.instance_method(:test).bind(self).call
   self.class.ancestors[2].instance_method(:test).bind(self).call
   super_n(1)
   super_n(2)
end
end

C.test.new

=>
I am C
I am A
I am B
I am A

···

On 9/12/06, Surendra Singhi <efuzzyone@netscape.net> wrote:

Now, in the function test in Class C, I want to call the test method defined
in class A, by passing B's test method.

How can I do this, just using plain 'super' doesn't work? Is it possible to do
this?

3

"Sander Land" <sander.land@gmail.com> writes:

···

On 9/12/06, Surendra Singhi <efuzzyone@netscape.net> wrote:

Now, in the function test in Class C, I want to call the test method defined
in class A, by passing B's test method.

How can I do this, just using plain 'super' doesn't work? Is it possible to do
this?

Use instance_method and bind.

module Kernel
def super_n(n=1)
   self.class.ancestors[n].instance_method(caller.first[/`(.*)'/][1..-2]).bind(self).call
end
end

Super cool, thanks a lot.

--
Surendra Singhi
http://ssinghi.kreeti.com, http://www.kreeti.com
Read my blog at: http://cuttingtheredtape.blogspot.com/
,----

"War is Peace! Freedom is Slavery! Ignorance is Strength!"
    -- Orwell, 1984, 1948

`----