implements?

macro

since v0.0-2014

Edit

---

Source docstring:

EXPERIMENTAL

(core/defmacro implements?
  [psym x]
  (core/let [p          (:name
                          (cljs.analyzer/resolve-var
                            (dissoc &env :locals) psym))
             prefix     (protocol-prefix p)
             xsym       (bool-expr (gensym))
             [part bit] (fast-path-protocols p)
             msym       (symbol
                          (core/str "-cljs$lang$protocol_mask$partition" part "$"))]
    (core/if-not (core/symbol? x)
      `(let [~xsym ~x]
         (if ~xsym
           (if (or ~(if bit `(unsafe-bit-and (. ~xsym ~msym) ~bit) false)
                    (identical? cljs.core/PROTOCOL_SENTINEL (. ~xsym ~(symbol (core/str "-" prefix)))))
             true
             false)
           false))
      `(if-not (nil? ~x)
         (if (or ~(if bit `(unsafe-bit-and (. ~x ~msym) ~bit) false)
                  (identical? cljs.core/PROTOCOL_SENTINEL (. ~x ~(symbol (core/str "-" prefix)))))
           true
           false)
         false))))

---