On Wed, Sep 19, 2012 at 3:10 PM, Eduardo Bellani <ebell...@gmail.com> wrote:
> Hello list.
>
> Could anyone give me a hand and explaing why this
>
> #lang racket
> (struct tst (attr1 attr2))
>
> (define-syntax (list->struct stx)
> (syntax-case stx ()
> [(_ attr-list) #`(tst #,@attr-list)]))
Do you have an example of a use where this breaks?
I suspect that you need to refer to attr-list in the syntactic environment, so
:
(define-syntax (list->struct stx)
(syntax-case stx ()
[(_ attr-list) #`(tst #,@#'attr-list)]))
But you might be able to handle the splicing directly through the
template, without needing to quasiquote:
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
#lang racket
(struct tst (attr1 attr2))
(define-syntax (list->struct stx)
(syntax-case stx ()
[(_ (attr-list ...))
#'(tst attr-list ...)]))
; ;Example
(list->struct (3 4))
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
Also, is this just for learning how to write macros, or are you trying
to serialize structures? If you're just trying to get structures
serializable, the documentation at
http://docs.racket-lang.org/reference/serialization.html may help.
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