From: Todd Benson <caduceass@...>
Date: 2012-10-25T02:39:09+09:00
Subject: Re: Name/symbol/object type clash? What is happening here?

On Tue, Oct 23, 2012 at 12:44 PM, Igor Pirnovar <lists@ruby-forum.com> wrote:

> Due to the problems shown above, perhaps Struct should be taken out of
> Ruby paradigm all together.
>
> However, except in limited initialization circumstances, the use of '@'
> variables should be prohibited, and from the point of view of strict
> OOP, it is, by convention! The use of 'Struct' should also be
> discouraged, and even worse, mixing Struct with class definitions and
> usage is ill advised.
>
> The above problem can be solved if you use accessor methods in place of
> '@' variable:
>
>   S = Struct.new(:num)
>   class S
>     def show_num; puts "Show:#{self.num}"; end
>     def change_num(n); self.num = n; end
>   end
>
>   s = S.new(100)
>   puts s.num  #=> 100
>   s.show_num  #=> Show:100
>
>   def s.change_singleton_num(n); self.num = n; end   # <<< SOLUTION
>
>   s.num = 1
>   puts s.num  #=> 1
>   s.show_num  #=> Show:1
>
>   s.change_num(2)
>   puts s.num  #=> 2
>   s.show_num  #=> Show:2
>
>   s.change_singleton_num(2000)
>   puts s.num  #=> 2000
>   s.show_num  #=> Show:2000
>
> Regards, igor

Okay, I see, thanks.