[racket] try/catch/finally idiom in Racket

Probably you wanted a prompt in that case.

Robby

On Friday, October 8, 2010, Neil Van Dyke <neil at neilvandyke.org> wrote:
> Should "racket/base" include something like "unwind-protect"?
>
> The documentation could warn about what this restricts.
>
> I feel bad every time I use "dynamic-wind" to approximate "unwind-protect", pretending that I don't have first-order continuations.  But often I'm cleaning up one-shot external resources anyway.  "unwind-protect" would be more explicit about the assumptions than "dynamic-wind" would, and incidentally would be tidier in the code.
>
> Jay McCarthy wrote at 10/08/2010 07:40 PM:
>
> I use dynamic-wind for this. If there is something better, I don't know what it is. dynamic-wind is a little bit funny though because if you capture continuations then the in/out handlers can run multiple times which might defy your expectations. You could set up a continuation barrier on the inside to ensure that doesn't happen though.
>
>
>
>
> --
> http://www.neilvandyke.org/
> _________________________________________________
>  For list-related administrative tasks:
>  http://lists.racket-lang.org/listinfo/users
>