From: Christoph <chr_mail@...>
Date: 2004-06-14T09:38:38+09:00
Subject: Re: undefine

tony summerfelt wrote:
....
> in my particular case i'm thinking black box approach. i don't want
> the variable to 'exist' any more.
> 
> i don't know if that's how it's thought of in perl, but when i
> undef($x), $x is no longer there for me to use unless i assign it
> something, and i can test that it isn't with:
> 
>  if ! defined($x) # do something.
> 
> as long as ruby 'acts' the same way, it's all i need.

I am aware of this kind of functionality for
instance and class variables - for local or
global variables such methods, afaik (I am not
really sure!!!) don't exist.
I see no problems with a removal method
for global variables but we are probably better
off without removal methods for local variables.


---
class A
@x = 1
@@x = 1
$x = 1
x = 1
remove_instance_variable :@x
remove_class_variable :@@x
begin
remove_gobal_variable :$x
rescue => mes
  puts mes
end

begin
  remove_local_variable :x
rescue => mes
  puts mes
end
end
---
undefined method `remove_gobal_variable' for A:Class
undefined method `remove_local_variable' for A:Class
---


/Christoph