Re: Passing optional arguments for use with internal functions

[Emanuel Berg]

uzibalqa wrote:

> What I did not immediately realise was that within the
> context of function arguments, lexical binding is the
> default way to handle function arguments in Lisp and Emacs
> Lisp, notwithstanding the file binding specification.
>
> Although one has to say that it is also possible to
> implement dynamic binding for function arguments in other
> languages. Is it possible to impose dynamic binding for
> function arguments in Emacs Lisp though?

It seems I was incorrect in this case, argument can be dynamic
like this:

;;; -*- lexical-binding: nil -*-
;;
;; this file:
;;   https://dataswamp.org/~incal/emacs-init/geh-dyn.el

(defvar gsdd 3)

(defun test-gsdd-gsdd ()
  gsdd)

(defun test-gsdd (&optional gsdd)
  (or gsdd (setq gsdd 4))
  (list (test-gsdd-gsdd) gsdd) )

;; (test-gsdd-gsdd) ; 3 - global/dynamic gsdd
;; (test-gsdd)      ; (4 4) - same
;; (test-gsdd 5)    ; (5 5) - same

(provide 'geh-dyn)

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