I'm trying to write a simple macro that will do CL-style call tracing
for me. When I try to use it, however, I'm getting an
"ExceptionInInitializerError." I don't know what this actually means,
though I'm sure I'm just doing something very stupid. I was hoping
someone on this list could help point out what I am doing wrong. I
ran
user=> (defmacro tracefn [function-name]
"Creates trace logging of calls to a function."
`(def ~function-name (let [old-function# ~(eval function-name)]
(fn [& args#]
(println args#)
(print " ")
(let [ret-val# (apply old-function#
args#)]
(println ret-val#)
ret-val#)))))
nil
user=> (defn poor-mans-multiply [x y]
(if (> x 0)
(+ y (poor-mans-multiply (dec x) y))
0))
#'user/poor-mans-multiply
user=> (poor-mans-multiply 3 4)
12
user=> (tracefn poor-mans-multiply)
java.lang.ExceptionInInitializerError (NO_SOURCE_FILE:0)
user=> (tracefn 'poor-mans-multiply)
java.lang.Exception: Second argument to def must be a Symbol
(NO_SOURCE_FILE:370)
user=> (poor-mans-multiply 3 4)
12
user=>
What am I doing wrong?
--Eric Tschetter
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