On Mon May 13 13:36:53 2013, Mark Engelberg wrote:
What tools exist in Clojure for understanding whether a given variable
is boxed or primitive?
To get a better handle on boxing, I started playing around with things
like:
(def x 1)
(def ^int x 1)
(def x (int 1))
I want to know how Clojure is storing that 1 in the various cases.
The only tool I know of to investigate the type of an object is to
call (type x), but type always reports things as boxed, so it is of no
help whatsoever.
How does one go about investigating this?
To be clear, I care less about the actual (def x ...) examples above
(although if you want to comment about that, that's certainly
helpful). I'm mostly concerned with figuring out how I can explore
these issues on my own.
Thanks,
Mark
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In the past I have used this code to help verify that functions are
returning primitives:
(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))
;; example use
user=> (defn foo ^long [] 23)
#'user/foo
user=> (pt (foo))
:long
However, I just tried it on your x and I got:
user=> (def ^int x 12)
#'user/x
user=> (pt x)
CompilerException java.lang.IllegalArgumentException: Unable to resolve
classname: clojure.core$int@1c461984, compiling:(NO_SOURCE_PATH:1)
Hopefully this helps somewhat... I'd be curious if anyone else has a
good way of doing this.
-Ben
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