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jakub-stastny/to-string.clj

Last active February 13, 2023 23:54
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to-string.clj
(defprotocol Version
"Version numbers of various levels connected by a dot: X.Y.Z"
(stringify [this] "Get string representation"))
(deftype QID
[a b c d] Version
(stringify [this]
(str (.a this) "." (.b this) "." (.c this) "." (.d this))))
(defmethod print-method QID [object out]
(.write out (str (stringify object))))
(println (stringify (QID. 4 0 0 1))) ; 4.0.0.1 calling explicitly
(println (str (QID. 4 0 0 1))) ; user.QID@5f38e560 <===== ?
(println (QID. 4 0 0 1)) ; 4.0.0.1 print-method
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