I'm working on some code where I want to evaluate different implementations
of the same functionality. Each implementation of a function lives in its
own namespace. For example, suppose that I have the following simplified
code.
(ns tst1)
(defn foo [x] (+ x 1))
(ns tst2)
(defn foo [x] (+ x 2))
(ns tst3)
(defn foo [x] (+ x 3))
(in-ns 'user)
What I'd like to do is call a macro that binds the function name in user to
the function in one of the libraries. The call would look like one of
these.
(switch-library! 'tst1 'foo)
(switch-foo-library! 'tst1)
The closest that I got was to do
(defmacro switch-foo-library! [x]
`(defn foo [y#] ((resolve (symbol (str ~x "/foo"))) y#)))
That's kind of embarrassing, but I think it does what I want. However,
suppose I do
(ns-unmap 'user 'juxt)
(defmacro switch-juxt-library! [x]
`(defn juxt [y#] ((resolve (symbol (str ~x "/juxt"))) y#)))
Now I get
CompilerException java.lang.RuntimeException: Can't create defs outside of
current ns, compiling:
Well, gosh. I can't play around with symbols in clojure.core? What's
happening here?
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