Re: Determine object passed as argument

On Sunday, April 12th, 2026 at 2:25 AM, Heime <[email protected]> wrote:

> 
> On Sunday, April 12th, 2026 at 12:57 AM, Jean Louis <[email protected]> wrote:
> 
> > On 2026-04-11 15:14, Heime wrote:
> 
> > > Can a function determine the object being passed as argument and
> > > print its name.  For instance that I passed if I pass fpln when
> > > calling (lana-du-fpln 'fpln).
> > >
> > > (defun lana-du-fpln (datenstruk &optional bname)
> >
> > In Emacs Lisp, you cannot directly get the variable name that was passed
> > to a function, because arguments are evaluated before being passed. By
> > the time datenstruk receives the value, the original variable name is
> > lost.
> >
> > (defun lana-du-fpln (datenstruk-symbol &optional bname)
> >    "Print the name of the symbol passed, then access its value."
> >    (message "Processing variable: %s" datenstruk-symbol)
> >    (let ((datenstruk (symbol-value datenstruk-symbol)))
> >      ;; Now work with datenstruk's value
> >      (message "Value: %S" datenstruk)))
> >
> > Call it with quoted symbol: (lana-du-fpln 'fpln)
> 
> The above gives "Warning: lana-fpln is unbound (void variable)"
> 
> > (defun lana-du-fpln (datenstruk-symbol &optional bname)
> >    "Print the name of the symbol passed, then access its value if bound."
> >    (message "Processing variable: %s" datenstruk-symbol)
> >    (if (boundp datenstruk-symbol)
> >        (let ((datenstruk (symbol-value datenstruk-symbol)))
> >          (message "Value: %S" datenstruk)
> >          ;; Your logic here
> >          )
> >      (message "Warning: %s is unbound (void variable)"
> > datenstruk-symbol)))
> >
> > "Warning: fpln is unbound (void variable)"
> 
> The above gives "Processing variable: fpln" followed by its value.
> 
> Why does the condition (if (boundp datenstruk-symbol) make things work out?

I actually need symbol-name.  Cannot understand the problem you are 
trying to describe to me.
 
> > --
> > Jean Louis
> >
> >