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;; Generic interface for functors | |
;; by Konrad Hinsen | |
;; Copyright (c) Konrad Hinsen, 2009-2011. All rights reserved. The use | |
;; and distribution terms for this software are covered by the Eclipse | |
;; Public License 1.0 (http://opensource.org/licenses/eclipse-1.0.php) | |
;; which can be found in the file epl-v10.html at the root of this | |
;; distribution. By using this software in any fashion, you are | |
;; agreeing to be bound by the terms of this license. You must not | |
;; remove this notice, or any other, from this software. | |
(ns | |
^{:author "Konrad Hinsen" | |
:doc "Generic functor interface (fmap)"} | |
clojure.algo.generic.functor) | |
(defmulti fmap | |
"Applies function f to each item in the data structure s and returns | |
a structure of the same kind." | |
{:arglists '([f s])} | |
(fn [f s] (type s))) | |
(defmethod fmap clojure.lang.IPersistentList | |
[f v] | |
(map f v)) | |
(defmethod fmap clojure.lang.IPersistentVector | |
[f v] | |
(into (empty v) (map f v))) | |
(defmethod fmap clojure.lang.IPersistentMap | |
[f m] | |
(into (empty m) (for [[k v] m] [k (f v)]))) | |
(defmethod fmap clojure.lang.IPersistentSet | |
[f s] | |
(into (empty s) (map f s))) | |
(defmethod fmap clojure.lang.IFn | |
[f fn] | |
(comp f fn)) | |
(prefer-method fmap clojure.lang.IPersistentVector clojure.lang.IFn) | |
(prefer-method fmap clojure.lang.IPersistentMap clojure.lang.IFn) | |
(prefer-method fmap clojure.lang.IPersistentSet clojure.lang.IFn) | |
(prefer-method fmap clojure.lang.IPersistentList clojure.lang.ISeq) | |
(defmethod fmap clojure.lang.ISeq | |
[f s] | |
(map f s)) | |
(defmethod fmap java.util.concurrent.Future | |
[f o] | |
(future (f @o))) | |
(defmethod fmap clojure.lang.Delay | |
[f d] | |
(delay (f @d))) | |
(defmethod fmap nil | |
[_ _] | |
nil) |