(defprotocol my-protocol
(foo [this]))
(extend-protocol my-protocol
clojure.lang.IPersistentMap
(foo [this] "hello from map"))
(criterium.core/quick-bench
(satisfies? my-protocol {}))
(criterium.core/quick-bench
(foo {}))
Simply calling foo on an empty map takes 7 ns,
but checking whether the map satisfies my-protocol takes 22 µs, 3000 times
longer.
It seems like to call foo, some mechanism has to look up an implementation
of my-protocol for maps -- how is it we can do that so quickly for a call
and so slowly for satisfies?
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