Hi again,
Is it possible to add primitive type hints to protocols (as the return
type)? My attempt below failed:
(definterface IPrimitiveTester
(getType [^int x])
(getType [^long x])
(getType [^float x])
(getType [^double x])
(getType [^Object x]))
(deftype PrimitiveTester []
IPrimitiveTester
(getType [this ^int x] :int)
(getType [this ^long x] :long)
(getType [this ^float x] :float)
(getType [this ^double x] :double)
(getType [this ^Object x] :object))
(defmacro primitive-type [x]
`(.getType (PrimitiveTester.) ~x))
(defmacro pt [x]
`(.getType (PrimitiveTester.) ~x))
(defprotocol Foo
(bar [foo]))
(deftype Dog []
Foo
(bar ^double [_] 42.0))
(pt (bar (Dog.))) ; => :object
(I also tried adding the hint to the protocol definition but that
resulted in a compiler error.)
In my googling the only other reference to protocols with primitive
support was an unanswered question on this mailing list last
November[1]. Hopefully my question gets a little more attention...
(Pardon all these primitive type questions but I'm in the process of
upgrading a 1.2 app to 1.3 and trying to convert some of our numeric
heavy java code into clojure in the process.)
Thanks,
Ben
1.
http://groups.google.com/group/clojure/browse_thread/thread/6015aacd6e8d0d20/ccca98bea3970240
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