From: Gary Wright <gwtmp01@...>
Date: 2010-02-06T02:59:23+09:00
Subject: Re: Inheritance related problem


On Feb 5, 2010, at 10:33 AM, Xavier Noëlle wrote:

> 2010/2/5 R. Kumar <sentinel.2001@gmx.com>:
>> If you are saying that aM() forces a call to the parent's m() and of
>> course you have inherited from Father, then yes.
> 
> Yes, my mistake, I forgot the "public Father".
> 
>> def aM
>>  super.m
>> end
> 
> Yes, indeed, but what if I need to call a specific parent's method ?
> Say Parent > Child > Grandchild. Is it possible to Parent::m in
> Grandchild (other than super.super.m(), if it works :-)) ?

That idiom isn't well supported in Ruby, but it is possible
in an awkward sort of way:

$ cat sample.rb
class Parent
  def foo(*args)
    puts "Parent:foo: #{args.inspect}"
  end
end
class Child < Parent
  def foo(*args)
    super
    puts "Child:foo: #{args.inspect}"
  end

  def parent_foo(*args)
    Parent.instance_method('foo').bind(self).call(*args)
  end
end
$ irb
>> load 'sample.rb'
=> true
>> Parent.new.foo(1,2,3)
Parent:foo: [1, 2, 3]
=> nil
>> Child.new.foo(4,5,6)
Parent:foo: [4, 5, 6]
Child:foo: [4, 5, 6]
=> nil
>> Child.new.parent_foo(7,8,9)
Parent:foo: [7, 8, 9]
=> nil
>> 




Gary Wright