Sorawee answered your immediate question, but I figured I'd offer a pointer to Fear of Macros in case you haven't seen it: https://www.greghendershott.com/fear-of-macros/ It helped me a lot when I was trying to get my head around macros. Also, I got a lot of value from reading through the code of https://pkgs.racket-lang.org/package/struct-update
On Thu, Sep 16, 2021 at 4:21 PM Dimaugh Silvestris < [email protected]> wrote: > (sorry if I'm asking too many questions about macros lately, I'm learning > about them but I keep running into scenarios I can't find documentation for) > > I'm trying to capture the value of a variable whose identifier I can only > get with format-id, inside a with-syntax. > Something like this pseudocode (imagine name-foo contains a list of > symbols): > (define-syntax (my-macro stx) > (syntax-case stx () > ((_ name other-args ...) > (with-syntax* ((varname (format-id #'name "~a-foo" #'name)) > (varval (cons (datum->syntax #'varname) (datum->syntax > #'(other-args ...))))) > #'(define name (λ varval (print varval))))))) > > > Which of course doesn't work. I understand this might have to do with how > macros work at an earlier phase than runtime, so is it impossible? > > -- > You received this message because you are subscribed to the Google Groups > "Racket Users" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > To view this discussion on the web visit > https://groups.google.com/d/msgid/racket-users/CAN4YmRF%3Do3NsXOvK2fvUDeYL_jfA9r946%3D%3DguoGb_%3DKyS%3Dm%2Bxw%40mail.gmail.com > <https://groups.google.com/d/msgid/racket-users/CAN4YmRF%3Do3NsXOvK2fvUDeYL_jfA9r946%3D%3DguoGb_%3DKyS%3Dm%2Bxw%40mail.gmail.com?utm_medium=email&utm_source=footer> > . > -- You received this message because you are subscribed to the Google Groups "Racket Users" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/racket-users/CAE8gKod53kD4ZFyxmatP4qx%2BvSKqrnT-if7PCD4MWxA7Tva3-Q%40mail.gmail.com.
