On Tue, Dec 8, 2015 at 7:16 AM, Angel Java Lopez <ajlopez2...@gmail.com> wrote:
> Hi! > > Sorry, this is not an answer, but a question: Why you need to know if an > argument is a lambda? What is your use case? > A simple use case (somewhat different from my actual case, but clearer) would be dynamic function dispatch. You have a vector of functions and a dispatch function that takes a vector of args and selects the "best match" from the fns vector. If things are expressed like so: (defn f1 ...) (defn f2 ...) ... (def fns [f1 f2 ...]) then it's easy: the dispatcher can pull the :arglists from the var metadata for the fn symbols and compare it with the incoming args. But if you allow inline lambdas you can't (at least I don't know how to) access the var metadata. In my case this is a problem because some of my functions will have a bit of custom metadata. To complicate things, let's say we allow clients to register functions, using a register-fn function or macro, for example. In my case, I have a function and I use it to pre-register some fns defined using #(...) syntax. The problem I'm encountering is that these functions do not seem to satisfy fn? or any other predicate I can think of to detect that they are in fact functions. Their types look like this: class miraj.sync$config_polymer_reqs$fn__16463 miraj.sync$config_polymer_reqs$fn__16463@541276dc - from this it is clear that they are function objects, but I don't want to rely on parsing out this kind of stuff. FYI mirj.sync is my namespace, config-polymer-reqs is my function, and #(...) is expressed in the result of a call to register-fn within config-polymer-reqs. (My use case involves macros and alter-var-root stuff to manage system config at startup. I don't have the heart to try to describe it at the moment.) Thanks, Gregg -- You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups "Clojure" group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
