From: Edward Faulkner <ef@...>
Date: 2006-02-08T05:35:36+09:00
Subject: Re: About Extending Systax

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On Wed, Feb 08, 2006 at 03:54:39AM +0900, mental@rydia.net wrote:
> You could use continutations. =20

Indeed.  With continuations you can build your own try/finally that
doesn't use the built in ruby begin/rescue at all:

$cc_stack =3D []

# takes two procs
def my_try(body, finally)
  if callcc {|cc| $cc_stack << cc}
    body.call
    $cc_stack.pop
  end
  finally.call
end

def my_throw
  $cc_stack.pop.call
end

You could play some tricks to get a nicer syntax, but that's the
general idea. =20

-Ed

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