Hello,
I am very new to Clojure, so please bear with me. I was reading
"Programming Clojure" and while reading about Macros, (specifically
Symbol Capture) I had the following question, could it be possible to
expand the macro into an anonymous function and evaluate that? For
example:
(defmacro bench [expr] `(let [start# (System/nanoTime)
result# ~expr] {:result result# :elapsed (- (System/nanoTime)
start#)}))
would be expanded as :
(macroexpand-1 '(bench f))
(clojure.core/let [start__154__auto__ (System/nanoTime)
result__155__auto__ f] {:result result__155__auto__, :elapsed
(clojure.core/- (System/nanoTime) start__154__auto__)})
instead, couldn't it be expanded to
((fn[f] (clojure.core/let [start (System/nanoTime) result f] {:result
result, :elapsed (clojure.core/- (System/nanoTime) start)})) f)
My thinking is that the anonymous function would protect the scope of
the let bindings inside of it which will make something like :
(let [start 0] (bench f)) run correctly without capturing the start
from the higher let binding. I would like to know if this would work,
and if not, why. The only thing I can see this helping with is
removing the need for "result#" syntax, and the compiler keeping track
of unique symbols in the same scope
Thanks,
-Kenan
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