2014-11-08 3:32 GMT+01:00 Blake McBride <blake1...@gmail.com>: > Greetings, >
Hi, I am an old lisp guy that is new to Clojure. > Welcome! Lisp can't do that without a real lot of work (make generic functions > evaluate the arguments and then execute the applicable method). > This is exactly what Clojure does, via JVM Reflection. When evaluating an interop form to call a java method like (.method object arg1 arg2), the first step is to find the method on object's class. Then, if multiple matching methods (based on arity) exist, a choice algorithm is employed, mimicking java's static dispatch. You can read about this in full detail in https://github.com/clojure/clojure/blob/master/src/jvm/clojure/lang/Reflector.java There's a builtin fast-path here: If the class of object can be inferred at compile time, and if there is no ambiguity in the signature, it compiles directly to an appropriate cast + method invokation. > So, Closure would be able to call Java methods as if they were Closure > functions taking into account the argument signature. Does Closure do that? > Nope, regular Clojure function calls always go via clojure.lang.IFn Also, I presume that a Closure program has immediate access to all Java > classes and methods without any work. Is that true? > Yes, that's what interop forms are for. They can look pretty much like regular calls, but if you want to pass them as argument to a HOF, you need to wrap them in a function. Documentation on this should be easy to find. kind regards -- 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.
