Hello,
I tried adding :doc and :added metadata on a protocol method signature but
found it hard to do:
;; defn-like, docstring then metadata map -> nope
(defprotocol P (foo "mydoc" {:added "1.0"} [_]))
; => CompilerException java.lang.IllegalArgumentException: Parameter
declaration missing, compiling:(/tmp/form-init3901889500037802283.clj:1:1)
;; defn-like, docstring in the metadata map -> nope
(defprotocol P (foo {:doc "mydoc" :added "1.0"} [_]))
; => CompilerException java.lang.IllegalArgumentException: Parameter
declaration missing, compiling:(/tmp/form-init3901889500037802283.clj:1:1)
;; Maybe after the arguments? -> ok for the doc
(defprotocol P (foo [_] "mydoc"))
(select-keys (meta #'foo) [:doc :added])
; => {:doc "mydoc"}
;; Let's add the :added bit -> nope
(defprotocol P (foo [_] "mydoc" {:added "1.0"}))
(select-keys (meta #'foo) [:doc :added])
; => {:doc "mydoc"}
;; Maybe both in the same map? -> nope
(defprotocol P (foo [_] {:doc "mydoc" :added "1.0"}))
(select-keys (meta #'foo) [:doc :added])
; => {:doc {:doc "mydoc" :added "1.0"}}
;; Not really. ^{} -style? -> nope
(defprotocol P (^{:doc "mydoc" :added "1.0"} foo [_]))
(select-keys (meta #'foo) [:doc :added])
; => {:doc nil :added "1.0"}
;; ^{} + after the args -> yeah!
(defprotocol P (^{:added "1.0"} foo [_] "mydoc"))
(select-keys (meta #'foo) [:doc :added])
; => {:doc "mydoc" :added "1.0"}
Is there a reason for this? I’m quite surprised using ^{:doc "..."} doesn’t
work.
Thanks,
-- Baptiste Fontaine
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