Perhaps I am too stupid, but I can't get it too work to define a
function/macro that returns me the arglists of a function I pass to
it.
The ^#' seems to work only on the symbol in the script - how do I wrap
this?
Concrete problem: I have some functions that users provide and they
are supposed to be executed only if I have a value for the named
arguments
-Carsten
On 24 Feb., 20:22, "Stephen C. Gilardi" <squee...@mac.com> wrote:
> On Feb 24, 2009, at 11:59 AM, Stuart Halloway wrote:
>
> > Is there a way to programmatically retrieve the :tag of an argument?
> > The var metadata will return the tag of a return value...
>
> Yes. Here an example:
>
> user=> (source slurp)
> (defn slurp
> "Reads the file named by f into a string and returns it."
> [#^String f]
> (with-open [r (new java.io.BufferedReader (new java.io.FileReader
> f))]
> (let [sb (new StringBuilder)]
> (loop [c (. r (read))]
> (if (neg? c)
> (str sb)
> (do
> (. sb (append (char c)))
> (recur (. r (read)))))))))
> nil
> user=> ^#'slurp
> {:ns #<Namespace clojure.core>, :name slurp, :file "core.clj", :line
> 2949, :arglists ([f]), :doc "Reads the file named by f into a string
> and returns it."}
> user=> (meta (first (first (:arglists ^#'slurp))))
> {:tag String}
> user=>
>
> --Steve
>
> smime.p7s
> 3KAnzeigenHerunterladen
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