[gambit-list] Segfault while importing enum

Vok Vojwo ceving at gmail.com
Wed Nov 2 14:30:19 EDT 2011


2011/11/2 Marc Feeley <feeley at iro.umontreal.ca>:
>
> Alternatively, use this macro to import C enums and constants:
>

I am experimenting with a symbol version:

(define gtk-window-new
  (let ((toplevel ((c-lambda () int "___result = GTK_WINDOW_TOPLEVEL;")))
        (popup ((c-lambda () int "___result = GTK_WINDOW_POPUP;")))
        (new (c-lambda (int) GtkWidget* "gtk_window_new")))
    (lambda (type)
      (new (case type
             ((toplevel) toplevel)
             ((popup) popup)
             (else "gtk-window-new: invalid type: " type))))))

This seems to be more natural in Scheme and the top level environment
would be smaller. But the code would be slower because of the case
dispatching. And every mapped C function accepting enumerations would
have three closures: the let, the lambda and the c-lambda.

Is this inappropriate expensive?


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