[racket] A safe version of unsafe-struct-ref [for Whalesong]

You can use extract-struct-info to get the field accessors in order, so you can list-ref that list to get the function you need for an unsafe-struct-ref.

However, bullet 4 of

http://docs.racket-lang.org/reference/structinfo.html

says sometimes you can't get all the accessors. Happy hacking.
-Ian
----- Original Message -----
From: "Jens Axel Søgaard" <jensaxel at soegaard.net>
To: "racket" <users at racket-lang.org>
Sent: Wednesday, July 2, 2014 3:06:50 PM GMT -05:00 US/Canada Eastern
Subject: [racket] A safe version of unsafe-struct-ref [for Whalesong]

Is it possible to implement unsafe-struct-ref using safe constructs only?

The reason behind this peculiar question, is that I am porting racket/match
to Whalesong. The match compiler uses various unsafe constructs that Whalesong
doesn't implement. It is straightforward to replace, say,
unsafe-vector-ref with vector-ref.

But unsafe-struct-ref ?

It is okay to use all tricks in the book in phase 1 (Whalesong has
restrictions in phase 0 only).

/Jens Axel
____________________
  Racket Users list:
  http://lists.racket-lang.org/users