[plt-scheme] Re: "unwind-protect" for PLT Scheme?

From: Shriram Krishnamurthi (sk at cs.brown.edu)
Date: Sat Jul 4 20:20:59 EDT 2009

You only need the before-thunk argument to do something if you have
continuations somewhere deep within the body expression.  (But note
that even if you don't use continuations, you just might use a library
function that does.)  As long as neither you nor a library does, you
can pass something trivial as before-thunk, such as void.  That
reduces to being the same as Lisp's unwind-protect.


On Sat, Jul 4, 2009 at 5:28 PM, Elena<egarrulo at gmail.com> wrote:
> Thank you for suggesting that article.
> Now, as a beginner, I'm a bit confused. To release resources - kind of
> "finally" in other languages - what should I use? It seems that
> dynamic-wind is appropriate for my simple code, I just have to stay
> away from using the before-thunk argument. Is it so?
> Thanks.
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