Re: Capturing a function in a closure

Glenn Willen wrote:

> One way to accomplish very nearly what I want is to use #. to refer to
the
> value of list which exists at _read time_ when the definition of my-list
is
> _read_. This strikes me as a terrible hack:
> 
> (defun my-list (&rest args) (apply #.#'list args))
> 
> Is there another way? (For that matter, does this way always do what I
think it
> does?)

Yes, this is a terrible hack. It's ugliness will manifest itself when 
you attempt to file-compile code with such references:

(defun foo (x) x)

(defun bar (x) (apply #.#'foo (list x)))

If you file-compile such code, the compiler will complain because the 
function foo is not defined yet at readtime.

What you want is load-time-value:

(defun foo (x) x)

(defun bar (x) (apply (load-time-value #'foo) (list x)))


Pascal

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