I created a library for Clojure to do open, single dispatch polymorphism. What does this mean?
* A polyfn dispatches on the type of its first argument. * You can add an implementation for a new type to an existing polyfn. * You can define a new polyfn on an existing type. Polyfns are exactly as fast as protocol functions (I am using the same caching and dispatch code), but they do not generate a Java interface, and they are slightly simpler to define. You can find polyfn here https://github.com/pjstadig/polyfn. You can pull it using Leiningen like so: [name.stadig/polyfn "1.0.2"] Or using Maven like so: <dependency> <groupId>name.stadig</groupId> <artifactId>polyfn</artifactId> <version>1.0.2</version> </dependency> EXAMPLE: Define some implementations for specific types. (require '[name.stadig.polyfn :refer [defpolyfn]]) (defpolyfn foo Long [exp] (inc exp)) (defpolyfn foo String [exp] "Hello, World!") Use it. (foo 1) => 2 (foo "string") => "Hello, World!" (foo 1.0) => #<IllegalArgumentException java.lang.IllegalArgumentException: No implementation of polyfn: #'user/foo found for class: java.lang.Double> Oops, there is no implementation for Double, let’s define one for java.lang.Number. (defpolyfn foo Number [exp] Number) (foo 1.0) => java.lang.Number The rest of the implementations remain the same (foo 1) => 2 (foo "string") => "Hello, World!" -- 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
