I am currently writing a neat logging lib and want it to support dynamic and static logging. When I activate (static-logging!) then the log macro (log :warn "message") will check during macro expansion time which log level is currently set and decides based on that if code will be generated that logs the message or not.
The user can set any log function and for that purpose I offer some closure factories, such as make-writer-logger or make-file-logger. Two useful writer-loggers are defined as: (def out-logger (make-writer-logger *out*)) (def err-logger (make-writer-logger *err*)) The make-writer-logger returns a closure that takes a level and a message and writes this to the given Writer. Now my current logger is stored in an atom, for example the default is (let [logger (atom out-logger)] …) Inside my log macro I want to call @logger, which unfortunately results in an Exception: “No matching ctor found for class my.logger$make_writer_logger$fn__1588” Please try this minimal example in your REPL: (defn f [x] (fn [] x)) ; the closure factory (def foo (f 0)) ; a useful instance (defmacro bar [] `(let [a# ~foo])) and then call (bar) As soon f doesn’t return a closure but just a fn, then this Exception is not thrown, but instead the code works. Just from looking at the macro definition I would say it should work for any object as long foo is defined. Is that behaviour a bug? How easy is it to fix it? Are there any work-arounds? Thanks, André -- 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
