From: Dan Debertin <airboss@...>
Date: 2002-09-05T09:56:55+09:00
Subject: Re-evaluating a 'case'

I was reminded of this problem by the recent 'breaking out of case'
thread. I have a 'case' statement that evaluates a condition:

case cond
when 'thing1'
  ...do thing1 stuff...
when 'thing2'
  ...do thing2 stuff...
  cond = 'thing1'
end

The 'thing2' clause changes the value of 'cond', so I want to be able
to bounce back to the top and re-evaluate the case. The way I ended up
doing it was:

begin
  case cond
  when 'thing1'
    ...do thing1 stuff...
  when 'thing2'
    ...do thing2 stuff...
    cond = 'thing1'
    raise
  end

rescue
  retry
end

Raising an exception on a non-error condition seems sort of hackish,
and I'm also worried that doing this a lot could have performance
impacts. 

Thoughts on other ways to do this?

Dan
--
/^Dan Debertin$/         
airboss@nodewarrior.org  | Did I sleep a little too late,
www.nodewarrior.org      | or am I awake?        --Byrne