Skip to content

Instantly share code, notes, and snippets.

@rain-1 rain-1/set.rkt
Created Mar 4, 2019

What would you like to do?
generalized set! in racket - failed idea
#lang racket
(require (for-syntax racket/syntax))
(define toplevel 'foo)
(define-syntax (set^ stx)
(syntax-case stx ()
[(_ (attr x) y)
(with-syntax ([set-attr! (format-id #'toplevel "set-~a!" (syntax-e #'attr))])
#'(set-attr! x y))]))
(define set-unbox! set-box!)
(define (t1)
(let ((b (box 3)))
(set^ (unbox b) 5)
(unbox b)))
; > (t1)
; 5
(define (t2)
(let ((b (box 3)))
(let ((set-unbox! 'blah))
(set^ (unbox b) 5)
(unbox b))))
;> (t2)
; 5
or even just use a function
(set! 'car thing value)
Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment
You can’t perform that action at this time.