Re: Defining functions within functions?

[Barry Margolin]

In article <864m9oj5cq.fsf@student.uu.se>,
 Emanuel Berg <embe8573@student.uu.se> wrote:

> What do you mean by "additional arguments" tho?
> What I can see (?) the only thing replaced (not
> added) is the let binding, by the
> function name!

If you have a local function, it can access variables in the calling 
function directly. If you move it out to a top-level function, you have 
to pass those variables as arguments.

(defun foo1 (x)
  (flet ((local-bar (y)
           (+ x y)))
    (local-bar 3)))

(defun foo2 (x)
  (global-bar 3 x))
(defun global-bar (x y)
  (+ x y))

And if the function being called needs to reassign the variable, you 
need to do that in the caller if you use a top-level function.

-- 
Barry Margolin, barmar@alum.mit.edu
Arlington, MA
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