I figured, but had to ask. I'm looking into adding a feature to Midje to be
able to say:
(defn g [a b c d e f g] nil)
(fact
(f 1) => 1
(provided
(g ...) :never ))
instead of what you currently have to say for the equivalent:
(fact
(f 1) => 1
(provided
(g anything anything anything anything anything anything anything) =>
anything :never ))
Knowing the arity of the function would have helped with the internals.
On Thu, Oct 20, 2011 at 11:42 PM, Alan Malloy <[email protected]> wrote:
> No. The summary is: from Java's point of view every function is
> "willing" to accept any number of args, but many of the
> implementations throw an exception. Vars have an :arglists metadata
> key, but that is not generally present on functions. I agree it would
> be nice if function objects carried a set of "acceptable arities" with
> them, but I haven't thought very hard about it - perhaps the
> performance implication this imposes on every function isn't worth it
> for the small minority of times when you need to ask the question.
>
> On Oct 20, 5:58 pm, Alex Baranosky <[email protected]>
> wrote:
> > For some work I'm doing it would be very nice to be able to know the
> number
> > of arguments any given function expects to be called with. Is there
> anyway
> > to get this information at run-time in Clojure?
> >
> > Thanks.
>
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