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pjstadig/gist:3215c5febf4861341c05

Created July 9, 2015 15:07
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MultiFn does not implement java.util.Comparator
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gistfile1.clj
Clojure 1.6.0
user=> (defmulti cmp (fn [a b] [(class a) (class b)]))
#'user/cmp
user=> (defmethod cmp :default [a b] (compare a b))
#<MultiFn clojure.lang.MultiFn@1da5688d>
user=> (sort cmp [:b :a])
ClassCastException clojure.lang.MultiFn cannot be cast to java.util.Comparator clojure.core/sort (core.clj:2829)
user=> (sort (fn [a b] (cmp a b)) [:b :a])
(:a :b)
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