From: "Iñaki Baz Castillo" <ibc@...>
Date: 2008-04-25T06:43:07+09:00
Subject: Re: Pointer concept in Ruby ?

El Jueves, 24 de Abril de 2008, Adam Shelly escribió:
> There are probabaly a million reasons this is a bad idea, but what about:
>
>  require 'ptrclass'
> => true
>  a = [0,1,2,3]
> => [0, 1, 2, 3]
>  ap = a.ptr(3)
> => 3
>  ap.val=4
> => 4
>  a
> => [0, 1, 2, 4]
>  r=a.ptr(6)
> => nil
>  r.val=4
> => 4
>  a
> => [1, 34, 3, nil, nil, nil, 4]
>
> --- ptrclass.rb----
> class PtrClass < DelegateClass(Object)
>   def initialize v
>     super
>     __setobj__ v
>   end
>   def val= v
>     __setobj__ v
>   end
> end
> class Array
>   def ptr n
>     v= self[n]
>     self[n] =  v.is_a?(PtrClass) ? v : PtrClass.new(v)
>   end
> end

It seems magic, thanks a lot.


-- 
Iñaki Baz Castillo