Hi all,
can anyone explain why these 2 are different given the same protocol
(the only difference is the swapped ordering)?
(defprotocol FOO
(bar [this a]
[this a b]) )
(extend-protocol FOO ;;THIS WORKS
(Class/forName "[D")
(bar
([_ a] a)
([_ a b] (+ a b)))
String
(bar
([_ a] (str a))
([_ a b] (str a b))))
(extend-protocol FOO ;;THIS WON'T COMPILE
String
(bar
([_ a] (str a))
([_ a b] (str a b)))
(Class/forName "[D")
(bar
([_ a] a)
([_ a b] (+ a b))) )
CompilerException java.lang.UnsupportedOperationException: nth not
supported on this type: Character, compiling:(NO_SOURCE_PATH:1:1)
it seems that the extension points include arrays, the ordering
matters!!! The extension to array has to come first otherwise it won't
even compile...Moreover, and possibly for the same reason, multiple
extensions for different array-types fails with the same exception. for
example while the following works:
(extend-protocol FOO
(Class/forName "[D")
(bar
([_ a] a)
([_ a b] (+ a b))) )
trying to add more types fails:
(extend-protocol FOO
(Class/forName "[D")
(bar
([_ a] a)
([_ a b] (+ a b)))
(Class/forName "[F")
(bar
([_ a] a)
([_ a b] (+ a b))) )
CompilerException java.lang.UnsupportedOperationException: nth not
supported on this type: Character, compiling:(NO_SOURCE_PATH:1:1)
Jim
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