[ruby-talk:03286] Re: BUG or something?

On 12 Jun 2000, Dave Thomas wrote:

> Well, you _could_ implement Perl's 'local' facility for Ruby globals:
> 
> 
>      def local(*syms)
>        save = {}
>        syms.each { |aSym| save[aSym] = (eval "#{aSym}") }
>        begin
>          yield
>        ensure
>          save.each { |aSym, aVal|  eval "#{aSym} = aVal" }
>        end
>      end
> 
	[...] 

This looks good to me.  

> 
> This is pretty tacky code - the 'local' method should check that it is
> only passed true globals, [...

Re-using an existing local variable and leaving it unchanged is not a
problem, is it?  Not sure why you need to only include true globals.

I don't thingk you'd have the same problems like Perl's local() vs my()
in nested calls either.

> ...]  and should reject $_ and $!. That's left as

I agree with that.

> an exercise to the reader (as we say) ;-)
> 
> 
> Dave
> 
> 
	Hugh
	[e-mail]