Re: Help with recursive destructive function

[Michael Heerdegen]

Eric Abrahamsen <address@hidden> writes:

> Pretty sure it did work, in effect it was doing this:
>
> (defun upcase-ref (ref)
>   (cl-callf upcase (gv-deref ref)))
>
> (let ((tree "one"))
>   (upcase-ref (gv-ref tree))
>   tree)

Ok.  This changes the binding of the variable named "tree", but not the
value.  The old value is gone.  I guess this is good enough for what you
want.

> Which for some reason the larger function is not doing any more. I'm not
> sure if it's necessary, but for instance I will have to be able to
> replace a list (representing an object constructor) into an actual
> object, which I assume is equivalent to this string upcase example.

The first thing `deep-edit' does when binding `stack' is to dereference
the passed reference.  The reference itself is never used, so its
"target" can't be changed.


Michael.