Mercurial > lasercutter

     1 ;; Generic interface for functors

     2 

     3 ;; by Konrad Hinsen

     4 ;; last updated May 3, 2009

     5 

     6 ;; Copyright (c) Konrad Hinsen, 2009. All rights reserved.  The use

     7 ;; and distribution terms for this software are covered by the Eclipse

     8 ;; Public License 1.0 (http://opensource.org/licenses/eclipse-1.0.php)

     9 ;; which can be found in the file epl-v10.html at the root of this

    10 ;; distribution.  By using this software in any fashion, you are

    11 ;; agreeing to be bound by the terms of this license.  You must not

    12 ;; remove this notice, or any other, from this software.

    13 

    14 (ns

    15   ^{:author "Konrad Hinsen"

    16      :doc "Generic functor interface (fmap)"}

    17   clojure.contrib.generic.functor)

    18 

    19 

    20 (defmulti fmap

    21   "Applies function f to each item in the data structure s and returns

    22    a structure of the same kind."

    23    {:arglists '([f s])}

    24    (fn [f s] (type s)))

    25 

    26 (defmethod fmap clojure.lang.IPersistentList

    27   [f v]

    28   (into (empty v) (map f v)))

    29 

    30 (defmethod fmap clojure.lang.IPersistentVector

    31   [f v]

    32   (into (empty v) (map f v)))

    33 

    34 (defmethod fmap clojure.lang.IPersistentMap

    35   [f m]

    36   (into (empty m) (for [[k v] m] [k (f v)])))

    37 

    38 (defmethod fmap clojure.lang.IPersistentSet

    39   [f s]

    40   (into (empty s) (map f s)))
author	Robert McIntyre <rlm@mit.edu>
date	Sat, 21 Aug 2010 06:25:44 -0400
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