It is possible with macros:
(defmacro next-number [] '(+ x 1))
Note that I'm using ' and not ` here, so the x isn't resolved. If I wanted
to use backticks, I'd need to write:
(defmacro next-number [] `(+ ~'x 1))
Macros also get an implicit &env binding that gives them access to the
local environment.
(defmacro locals [] (into {} (for [x (keys &env)] [`'~x x])))
- James
On 14 June 2014 01:16, Christopher Howard <cmhowa...@alaska.edu> wrote:
> This might be kind of perverse, but I was wondering if it was possible
> to write a function or macro that takes "hidden parameters", i.e.,
> uses symbols defined in the scope of use, without passing them in
> explicitly.
>
> For example, function "next-number" takes hidden parameter "x", so
>
> => (let [x 12] (next-number))
>
> Would return 13.
>
> With the whole "code is data" paradigm it seems like this should be
> possible, but I haven't figured out how to do this yet without getting
> an error.
>
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