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data.cljc
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data.cljc
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;; Copyright (c) 2014-2015 Andrey Antukh <niwi@niwi.nz>
;; Copyright (c) 2014-2015 Alejandro Gómez <alejandro@dialelo.com>
;; All rights reserved.
;;
;; Redistribution and use in source and binary forms, with or without
;; modification, are permitted provided that the following conditions
;; are met:
;;
;; 1. Redistributions of source code must retain the above copyright
;; notice, this list of conditions and the following disclaimer.
;; 2. Redistributions in binary form must reproduce the above copyright
;; notice, this list of conditions and the following disclaimer in the
;; documentation and/or other materials provided with the distribution.
;;
;; THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
;; IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
;; OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
;; IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
;; INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
;; NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
;; DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
;; THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
;; (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
;; THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
(ns cats.data
"Data structures that are used in various places of the library.")
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;; Pair type constructor and functions
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
(deftype Pair [fst snd]
#?(:clj clojure.lang.Seqable
:cljs cljs.core/ISeqable)
(#?(:clj seq :cljs -seq) [_]
(list fst snd))
#?(:clj clojure.lang.Indexed
:cljs cljs.core/IIndexed)
(#?(:clj nth :cljs -nth) [_ i]
(case i
0 fst
1 snd
(throw #?(:clj (IndexOutOfBoundsException.)
:cljs (js/Error. "Out of index")))))
(#?(:clj nth :cljs -nth) [_ i notfound]
(case i
0 fst
1 snd
notfound))
#?(:clj clojure.lang.Counted
:cljs cljs.core/ICounted)
(#?(:clj count :cljs -count) [_] 2)
#?(:clj java.lang.Object
:cljs cljs.core/IEquiv)
(#?(:clj equals :cljs -equiv) [this other]
(if (instance? Pair other)
(and (= (.-fst this) (.-fst other))
(= (.-snd this) (.-snd other)))
false))
#?(:clj
(toString [this]
(with-out-str (print [fst snd])))))
(alter-meta! #'->Pair assoc :private true)
(defn pair
[fst snd]
(Pair. fst snd))
(defn pair?
[v]
(instance? Pair v))